VANE PUMP
The purpose of the present invention is to provide a vane pump that is able to prevent decrease of power transmission efficiency when the vane pump is used in combination with a device such as a transmission device, for example. Therefore, this vane pump (10, 20, 50, 60, 70, 80, 90) has a hollow shaft (1, 21, 51, 61, 71, 81, 91), the hollow shaft (1, 21, 51, 61, 71, 81, 91) is configured such that a hollow portion thereof allows a rotation driving shaft (which is, for example, an input shaft 103 of a transmission device as illustrated in FIG. 1, and, which also includes an input shaft which is inserted directly into the transmission device from a driving source 102 without having a coupling interposed therebetween) of the driving source (102) to be inserted therethrough, and the hollow shaft (1, 21, 51, 61, 71, 81, 91) and the rotation driving shaft (103) are coupled by means of a mechanism (spline, key and key groove, etc.) for transmitting a torque but transmitting no thrust.
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The present invention relates to a vane pump.
BACKGROUND ARTVarious types of a vane pump, which includes a cam ring with an internal space having a non-circular sectional shape and a rotor having a circular sectional shape and a vane (blade) moving freely in a radial groove being machined into a rotor, have been proposed (see Patent Literature 1, for example).
Such vane pump is applied in a manner that a vane pump is mounted on a transmission device, in some cases.
In the prior art, as shown in
In
The gears 107, 108 construct a gear mechanism in which the second shaft 104 offset the input shaft 103.
However, in constructions shown in
Moreover, it is necessary to carryout a step for matching the second shaft 104 with a rotation center axis of the vane pump 100, that is, a so-called “centering” step.
CITATION LIST Patent Literature
- Patent Literature 1
Non-examined Japanese Patent Application Publication No. 2012-163040
SUMMARY OF INVENTION Technical Problem to be SolvedThe present invention was proposed in view of the above-mentioned problem of the prior art and an object of present invention is to provide a vane pump which can prevent lowering of power transmission efficiency when the vane pump is used in combination with a transmission device, for example.
[Construction of Invention]A vane pump (10, 20, 50, 60, 70, 80, 90) of the present invention is characterized in that:
the pump comprises a hollow shaft (1, 21, 51, 61, 71, 81, 91),
the hollow shaft (1, 21, 51, 61, 71, 81, 91) is constructed such that a rotation driving shaft (the input shaft 103 of the transmission device 101 as shown in
the hollow shaft (1, 21, 51, 61, 71, 81, 91) and the rotation driving shaft (103) are coupled (connected or engaged) by a mechanism for transmitting a torque but transmitting no thrust.
In the present invention, a rotor (2, 22) is preferably mounted on the hollow shaft (1, 21, 51, 61, 71, 81, 91).
Here, it is preferable that the hollow shaft (1, 21, 51, 61, 71, 81, 91) and the rotor (2, 22) are mounted in a manner that relative rotation is not possible and movement in an axial direction is limited by a wire ring (3, 23), and that the wire ring (3, 23) is disposed across a shaft-side recess portion (1A) and a rotor-side stepped portion (2A) in a state that the shaft-side recess portion (1A) formed on the hollow shaft (1, 21, 51, 61, 71, 81, 91) and the rotor-side stepped portion (2A) formed on the rotor (2, 22) are aligned.
In this case, the rotor-side stepped portion (2A) is formed on both side surfaces of the rotor (2, 22), and a depth dimension (d1) of the rotor-side stepped portion (2A) is preferably larger than a diameter (D1) of a wire material of the wire ring (3, 23).
Moreover, in the present invention, it is preferable that mechanical seal (4A, 4B, 24A, 24B) is provided on both end portions in the axial direction of the hollow shaft (1, 21), and a circuit (5, 25: relief circuit for protection) for communicating the mechanical seals (4A, 4B, 24A, 24B) on the both end portions each other.
In carrying out of the present invention, the rotor (2) and a cam ring (6) may be provided one respectively or may be provided in plural (two each, for example).
In the present invention, the mechanism for transmitting a torque but transmitting no thrust may be a female spline and a male spline formed on an inner peripheral surface of the hollow shaft (1, 21, 51, 81, 91) and an outer peripheral surface of the rotation driving shaft (103), or may be a key (52) and a keyway (53).
Moreover, the mechanism for transmitting a torque but transmitting no thrust preferably may be constructed by an engagement groove (61B) penetrating the hollow shaft (61), a through hole of the rotation driving shaft (103) and a spring pin (62) being capable of insertion into the engagement groove (61B) and the through hole.
Alternatively, it is possible to form a plurality of accommodating portions (71B) at an equal interval in a circumferential direction of the hollow shaft (71), a spherical member (72: engagement ball) and a radial direction pressing member (73: pressing bolt) for pressing the spherical member (72) inwardly in the radial direction are accommodated in the accommodating portion (71B), and a plurality of the spherical members (72: engagement ball) is pressed inwardly in the radial direction so that the hollow shaft (71) and the rotation driving shaft (103) can be coupled.
In the present invention, it is preferable that the mechanism for transmitting a torque but transmitting no thrust is constructed by splines formed on the outer peripheral surface of the rotation driving shaft (103) and the inner peripheral surface of the hollow shaft (81), the splines are formed only in regions (regions immediately below the vane) in the vicinity of the vane in the axial direction of the rotation driving shaft (103) and the hollow shaft (81), a region where the splines are not provided in the rotation driving shaft (103) and the hollow shaft (81) constructs a lubricant-oil filling space (large diameter portion) in which a lubricant oil (grease oil, for example) is filled, and a sealing member (82: a square ring, for example) for the lubricant oil is provided in a region on a side separated from a cover portion (7).
Alternatively, it is preferable that the mechanism for transmitting a torque but transmitting no thrust is constructed by splines formed on the whole region in the axial direction of the outer peripheral surface of the rotation driving shaft (103) and the inner peripheral surface of the hollow shaft (91), a sealing member (92: a spline seal) for the lubricant oil is disposed in a region on a side separated from the cover portion (7), the sealing member (92) has projections and recesses formed on an outer periphery thereof, and that the projections and recesses are formed so as to correspond to the spline (female spline) formed on the inner peripheral surface of the hollow shaft (91).
Moreover, in the present invention, the hollow shaft (51, 61, 71, 81, 91) is preferably supported by a supporting member disposed on a side being separated from the cover portion (7) and a supporting member disposed in the vicinity of the cover portion (7).
In this case, instead of the circuit (5, 25: relief circuit for protection) communicating the mechanical seal (4A, 4B, 24A, 24B) on the both end portions in the axial direction of the hollow shaft (1, 21) each other, it is preferably to provide a circuit (55) communicating the mechanical seal (4B, 24B) on the cover portion (7, 27) side with an intake portion (intake port 14).
Advantageous Effect of InventionAccording to the vane pump (10, 20, 50, 60, 70, 80, 90) of the present invention comprising the above-mentioned constructions, the vane pump (10, 20, 50, 60, 70, 80, 90) includes the hollow shaft (1, 21, 51, 61, 71, 81, 91), by inserting the rotation driving shaft (the input shaft 103 of the transmission device 101, for example) of the driving source (102) into the hollow portion of the hollow shaft (1, 21, 51, 61, 71, 81, 91), and by coupling the hollow shaft (1, 21, 51, 61, 71, 81, 91) and the rotation driving shaft (103) by the mechanism (splines, key and keyway and the like) for transmitting a torque but transmitting no thrust, the vane pump (10, 20, 50, 60, 70, 80, 90) is rotated/driven by the rotation driving shaft (105) of the driving source (102) without interposing a coupling separately.
As a result, when the vane pump (10, 20, 50, 60, 70, 80, 90) is used in a manner that the vane pump is attached to another device (the transmission device 101, for example), for example, since the vane pump (10, 20, 50, 60, 70, 80, 90) is directly rotated/driven by the input shaft (103) of the transmission device (101), for example, it is not necessary to provide a gear mechanism (the gear mechanisms 107, 108 inside the transmission device 101 shown in
Moreover, since it is not necessary to separately provide the shaft (the second shaft 104: see
And then, since it is only necessary that the power transmission shaft (the input shaft 103 of the transmission device 101, for example) is inserted into the hollow portion of the hollow shaft (1, 21, 51, 61, 71, 81, 91) of the vane pump (10, 20, 50, 60, 70, 80, 90), a labor and/or cost for assembling is remarkably reduced.
Moreover, according to the present invention, since the rotation driving shaft (a solid shaft: the input shaft 103 of the transmission device 101 shown in
Here, in a case that the driving source (102) is an internal combustion engine, it is necessary to provide a bearing (a bearing bush, for example) for supporting the hollow shaft (1, 21, 51, 61, 71, 81, 91) in the radial direction. However, in a case that the driving source (102) is an electric motor, it is possible to delete (omit) such a bearing (a bearing bush, for example) for supporting the hollow shaft (1, 21, 51, 61, 71, 81, 91) in the radial direction.
In the present invention, by mounting the rotor (2, 22) on the hollow shaft (1, 21, 51, 61, 71, 81, 91), it is possible to prevent a situation such that the hollow shaft (1, 21, 51, 61, 71, 81, 91) is removed from the vane pump (10, 20, 50, 60, 70, 80, 90).
Here, since the rotation driving shaft (solid shaft: the input shaft 103 of the transmission device 101 shown in
Then, by mounting the hollow shaft (1, 21, 51, 61, 71, 81, 91) and the rotor (2, 22) so that the relative rotation is impossible and that the movement in the axial direction is limited by the wire ring (3, 23), and by disposing (positioning) the wire ring (3, 23) in the mode that the wire ring across the shaft-side recess portion (1A) and the rotor-side stepped portion (2A) in a state in which the shaft-side recess portion (1A) formed on the hollow shaft (1, 21, 51, 61, 71, 81, 91) and the rotor-side stepped portion (2A) formed on the rotor (2, 22) are aligned, a gap is generated in a mounting portion of the hollow shaft (1, 21, 51, 61, 71, 81, 91) and the rotor (2, 22), and even if the hollow shaft (1, 21, 51, 61, 71, 81, 91) is moved in the axial direction, the rotor (2, 22) is not moved for the gap portion, and the rotor (2, 22) is prevented to collide against to the cover portion (7, 27), a pressure plate (18, 38) or an intermediate plate (40).
Here, the rotor-side stepped portion (2A) is formed on both side surfaces of the rotor (2, 22), and if the depth dimension (d1) of the rotor-side stepped portion (2A) is larger than the diameter (D1) of the wire rod of the wire ring (3, 23), the wire ring (3, 23) can be accommodated inside the rotor (2, 22), the rotor (2, 22) is prevented to interfere with the wire ring (3, 23), and design of pump construction on the both side surfaces of the rotor (2, 22) become easy.
In the present invention, in some cases, the mechanical seal (4A, 4B, 24A, 24B) are disposed on both end portions in the axial direction of the vane pump (10, 20).
However, in the prior-art vane pump, the mechanical seal is provided only on one side (an end portion being close to an equipment supplying power, for example) in the axial direction, but the mechanical seal is not provided on the other (the end portion being separated from the equipment supplying power, for example). Then, a relief circuit for relieving a pressure operating on the mechanical seal is also provided only on the end portion on a side to which the mechanical seal is provided, while the relief circuit is not formed on the other (the end portion being separated from the equipment supplying power, for example), and thus, in a case that the constructions of the prior-art vane pump is applied to the present invention, it is possible that the mechanical seal provided on the other is broken.
On the other hand, in the present invention, by providing a circuit (5, 25: relief circuit for protection) communicating the mechanical seal (4B, 24B) on the other (the end portion being separated from the equipment supplying power, for example) with the mechanical seal (4A, 24A) on the one (the end portion close to the equipment supplying power, for example), the pressure operating on the other mechanical seal (4B, 24B) can be relieved to the relief circuit (9, 29) for mechanical seal through the circuit (5, 25).
In the present invention, in a case that the hollow shaft (51, 61, 71, 81, 91) is supported by the supporting member disposed on a side separated from the cover portion (7) and the supporting member disposed in the vicinity of the cover portion (7), since the hollow shaft (51, 61, 71, 81, 91) is supported at two spots being separated in the axial direction, that is, the hollow shaft is supported by a manner so-called both-end supporting, and thus, the hollow shaft (51, 61, 71, 81, 91) can be accurately centered with the rotation driving shaft (103) and pump efficiency can be improved, as compared with the case of supporting with a single supporting member. The supporting member may be a bearing bush (19, 54) or may be constructed as direct receiving by forming a film of a material which improves abrasion resistance on a surface of an insertion hole for the hollow shaft (51, 61, 71, 81, 91) of the case (8) or the cover portion (7).
In this case, by providing the supporting member (bearing bush 54) disposed in the vicinity of the cover portion (7), the circuit (relief circuit 5, 25 for protection in the hollow shaft 1, 21) communicating the mechanical seals (4A, 4B, 24A, 24B) on the both end portions in the axial direction of the hollow shaft (51, 61, 71, 81, 91) each other cannot be constructed any more.
However, in the present invention, in a case that the circuit (55) communicating the mechanical seal (4B, 24B) on the cover portion (7, 27) side and the intake portion (intake port 14) is provided, the pressure operating on the mechanical seal (4B, 24B) on the cover portion side can be relieved to the intake portion (intake port 14) by the circuit (55). And a length dimension and pipe resistance of the circuit (55) communicating the mechanical seal (4B, 24B) on the cover portion (7, 27) side and the intake portion (intake port 14) are smaller than the length dimension and pipe resistance of the circuit (5, 25) communicating the mechanical seals (4A, 4B, 24A, 24B) on the both end portions in the axial direction of the hollow shaft (1, 21), and thus, the pressure operating on the mechanical seal (4B, 24B) on the cover portion side can be relieved reliably and an operative effect as the relief circuit is reliably carried on.
In the present invention, in a case that the mechanism for transmitting a torque but transmitting no thrust is constructed by the splines formed on the outer peripheral surface of the rotation driving shaft (103) and on the inner peripheral surface of the hollow shaft (81), the splines is only formed in the region (region immediately below the vane) in the vicinity of the vane in the axial direction of the rotation driving shaft (103) and the hollow shaft (81), the lubricant-oil filling space (large diameter portion) is constructed in which space a lubricant oil (grease oil, for example) is filled in the region where the splines of the rotation driving shaft (103) and the hollow shaft (81) are not provided, and the sealing member (82: a square ring, for example) for the lubricant oil in the region on the side separated from the cover portion (7) is provided, even if the lubricant oil is filled in the lubricant-oil filling space, the lubricant oil is sealed by the sealing material (82) and the state in which the lubricant oil is filled can be maintained.
In a case that the driving source is an internal combustion engine, torque fluctuation being specific to the internal combustion engine generates the collisions of teeth of the male and female splines against each other (teeth are hit by each other) through the rotation driving shaft (103) and the hollow shaft (81, 91), and therefore, a tooth surface of the spline is damaged, however, by filling the lubricant oil in the lubricant-oil filling space, the lubricant oil is interposed between teeth of the male and female splines and a buffer operation is carried on by the lubricant oil as a cushion, and thus, damage on the tooth surface caused by the collision between the teeth is reduced.
Here, in a case that a sealing member for lubricant oil such as a square ring should be installed, for example, if the mechanism for transmitting a torque but transmitting no thrust is constructed by the splines formed on the whole regions in the axial direction on the outer peripheral surface of the rotation driving shaft and the inner peripheral surface of the hollow shaft, it is necessary to cut off the spline (of the inner peripheral surface of the hollow shaft) at a place where the sealing member for the lubricant oil should be installed by machining so as to form a cylindrical surface, and then, it is necessary to provide a square ring.
On the other hand, in the present invention, if the sealing member (92: spline seal) of the lubricant oil to be provided in the region on the side being separated from the cover portion (7) is constructed by a sealing member (92: spline seal) with projections and recesses formed on the outer periphery thereof, the projections and recesses being formed corresponding to the spline (female spline) are formed on the inner peripheral surface of the hollow shaft (91), without cutting off the spline (of the inner peripheral surface of the hollow shaft) at a place where the sealing member for the lubricant oil should be provided by machining so as to form a cylindrical surface, or without increasing a machining cost of the hollow shaft (91), the sealing member (92: spline seal) for the lubricant oil can be provided, by assembling the spline seal (92) from a distal end side (right end side in
Embodiments of the present invention will be described below by referring to the attached drawings.
First, by referring to
In
The vane pump 10 (20) includes the hollow shaft 1 (or 21) and a female spline is engraved on the inner peripheral surface of the shaft 1 over the axial direction. Into the hollow portion of the hollow shaft 1 (21), the input shaft 103 (coupled with the rotation driving shaft of the driving source 102 through the coupling 106) of the transmission device 101 is inserted.
Though not shown clearly in drawings, the input shaft 103 of the transmission device 101 is reliably supported by a rolling bearing (not shown) on the transmission device 101 side.
As shown in
Thus, without providing other coupling (such as the second coupling 109 in
Moreover, in the embodiment shown in
That is, in the embodiment, there is no loss in engagement portions between the shaft 103 and the gear 107, the second shaft 104 and the gear 108, and the gear 107 and the gear 108 generated in the case of the prior art in
Moreover, in the embodiment shown in
Furthermore, since it is merely necessary that the input shaft 103 of the transmission device 101 is inserted into (fitted with) the hollow shaft 1 (21) of the vane pump 10 (20), centering of the hollow shaft 1 (21) and the input shaft 103 of the transmission device 101 is not necessary. Thus, working cost of the assembling process is remarkably reduced.
Next, by referring to
The first embodiment shown in
In
In a case that the vane pump 10 is mounted on the transmission device 101 as shown in
In
On the rotor 2, a plurality of radial vane grooves 11G (
A vane 11 is constructed movably in the radial direction along the vane groove 11G, and a part of a pressure oil ejected from an ejection port 16 during driving of the vane pump is supplied to a pressure-oil storage portion 12 for vane through a circuit 17 for pressure loading (pressure loading), whereby the vane 11 is urged outward in the radial direction and protruded, and an end portion outward in the radial direction of the vane 11 slides on the inner peripheral surface of the cam ring 6. Here, the pressure-oil storage portion 12 for vane is formed in the rotor 2 (refer to
During driving of the vane pump 10, the rotor 2 is rotated in an arrow A direction (
A position of the pump chamber α is changed with the rotation of the rotor 2 (corresponding to a circumferential position of the cam ring 6), and a size (volume) of the pump chamber α is also changed with the rotation of the rotor 2 (corresponding to the circumferential position of the cam ring 6).
That is, the working fluid supplied from the intake port 14 flows into the pump chamber a via the intake circuit 13. Then, by means of contracting the volume of the pump chamber as, a pressure is applied and the working fluid is ejected from the ejection port 16 via an ejection circuit 15.
As shown in
In the body portion 8, the hollow shaft 1, the rotor 2, the vane 11 (movable in the vane groove of the rotor 2), and the cam ring 6 are accommodated.
Then, in
In the body portion 8 accommodating the rotor 2, the cam ring 6 and the like, the cover portion 7 is disposed on its opening side (left side in
As shown in
Moreover, the ejection circuit 15 for the working fluid is provided in the body portion 8, and the ejection circuit 15 communicates with an outlet port 16 for the working fluid.
Since the rotation driving shaft (the input shaft 103 of the transmission device 101 shown in
Here, by mounting the rotor 2 on the hollow shaft 1, there is an operative effect that the hollow shaft 1 is prevented to be removed from the vane pump 10.
In order to rotate the rotor 2, it is necessary to be a gap (approximately 10 μm, for example) between the rotor 2 and the cover portion 7 adjacent to the rotor 2 or the pressure plate 18. Here, if the rotor 2 and the hollow shaft 1 are completely fixed (incapable of relative rotation and incapable of axial movement), in a case that the hollow shaft 1 is moved in the axial direction, there is inconvenience that the rotor 2 collides against the cover portion 7 or the pressure plate 18.
Reversely, in the embodiments shown in drawings, as a manner that the rotor 2 is mounted on the hollow shaft 1 by the wire ring 3 so as to limit movement in the axial direction, as shown in
Here, the rotor-side stepped portion 2A is formed on the both side surfaces of the rotor 2. In
By being constructed as the manner shown in
As described above, in
Moreover, since the rotation driving shaft (input shaft 103 of the transmission device 101) which is a solid shaft is inserted through the hollow portion in the hollow shaft 1, the hollow shaft 1 is not biased in the radial direction unless the rotation driving shaft (input shaft 103 of the transmission device 101) makes a motion such as precession biased in the radial direction. And then, though not shown clearly, since the rotation driving shaft (input shaft 103 of the transmission device 101, for example) which is a solid shaft is reliably supported by the rolling bearing (not shown) on the transmission device 101 side, it is not biased in the radial direction.
However, in a case that such a situation occurs that the hollow shaft 1 is biased in the radial direction, inconvenience situation is happened in the vane pump 10. Therefore, in preparation for such situation (the situation in which the hollow shaft 1 is biased in the radial direction), as shown in
The bearing bush 19 operates as a sliding bearing, and thus, in the first embodiment shown in
Here, in a case that the driving source 102 is an internal combustion engine, the bearing bush 19 for supporting the hollow shaft 1 in the radial direction is needed. However, in a case that the driving source (102) is an electric motor, the bearing bush 19 for supporting the hollow shaft 1 in the radial direction can be omitted.
As described above, in the first embodiment shown in
In the case of the prior-art vane pump, as shown in
Reversely, in the vane pump 10 according to the first embodiment in which the solid shaft (not shown in
Also, in the body portion 8, the relief circuit 9 for mechanical seal is provided in order to communicate the back portion (left side in
Here, in the case of the prior-art vane pump, since the mechanical seal is provided only on one end portion in the axial direction, it is necessary to provide the relief circuit merely on the end portion on the side where the mechanical seal is provided, which relief circuit prevents a situation that a pressure exceeding an allowable value operates to the mechanical seal. Thus, in the prior art, as described above with reference to
However, in the embodiments shown in drawings in which the mechanical seals 4A, 4B are disposed on the both end portions in the axial direction (the body portion 8 side end portion and the cover portion 7 side end portion), it is required to provide a mechanism for relieving the pressure operating on the mechanical seal 4B (mechanical seal on the end portion separated from the equipment for supplying power: the mechanical seal considered to have little necessity to be provided in the prior art) on the other end portion in the axial direction (left end portion in
Because there is a possibility that a back pressure of the mechanical seal 4B provided on the other end portion in the axial direction (the left end portion in
In the embodiments shown in drawings, as shown in
In
In other words, the mechanical seal 4B (the mechanical seal on the side separated from the relief circuit 9 for mechanical seal) on the cover portion 7 side end portion communicates with the relief circuit 9 for mechanical seal through the relief circuit 5 for protection.
Reference numeral 16 shown in
In
Thus, in
In
Here, a joining bolt B shown in
However, in a case that the vane pump 10 is mounted on the transmission device 101, for example, by inserting a bolt, which is not shown, into the bolt hole H, since the body portion 8 and the cover portion 7 of the vane pump 10 are also integrally joined by the bolt which is not shown, the joining bolt B in
In the vane pump 10 according to the embodiment in
As a result, in a case that the vane pump 10 is used in a manner that the vane pump 10 is mounted on the transmission device 101, for example, since the vane pump 10 is directly rotated/driven by the input shaft 103 of the transmission device 101, it is not necessary to provide a gear mechanism for transmitting a rotation driving force and a shaft for rotating/driving a vane pump separately, and also, it is not necessary to provide a coupling mechanism between the vane pump 10 and the driving shaft. Thus, there is no transmission loss by coupling, meshing between the gears and the like, transmission efficiency is improved, and it is possible to become the transmission device 101 smaller.
And then, since the gear mechanism for transmitting a rotation driving force or the like is not necessary, the number of constructional components is largely reduced, and component management becomes extremely easy.
Moreover, since it is only necessary to insert the power transmission shaft (input shaft 103 of the transmission device 101, for example) into the hollow portion of the hollow shaft 1 of the vane pump 10, centering of the power transmission shaft and the hollow portion of the hollow shaft 1 are not necessary, and therefore, a labor cost for assembling work of the vane pump 10 is remarkably reduced.
Moreover, according to the vane pump 10 of the first embodiment, since the rotation driving shaft (solid shaft: the input shaft 103 of the transmission device 101 shown in
Moreover, the hollow shaft 1 is not biased in the radial direction, unless the rotation driving shaft 103 which is a solid shaft makes a motion such as precession biased in the radial direction. And then, in a case that the rotation driving shaft 103 is reliably supported by a rolling bearing or the like on the rotation driven side (the transmission device 101, for example), the rotation driving shaft 103 is not biased in the radial direction.
Furthermore, according to the vane pump 10 of the first embodiment, even if the force in the rotation shaft direction (force in the thrust direction) operates on the rotation driving shaft 103 of the driving source 102, as described above, the hollow shaft 1 does not load the force in the axial direction. Thus, even if the rotor 2 is mounted on the hollow shaft 1, the force in the axial direction of the rotation shaft 103 of the driving source 102 is not transmitted to the rotor 2.
And then, since the hollow shaft 1 and the rotor 2 are mounted by the wire ring 3, and the wire ring 3 is disposed in the manner that the wire ring extends across the shaft-side recess portion 1A and the rotor-side stepped portion 2A in the state that the shaft-side recess portion 1A formed on the hollow shaft 1 and the rotor-side stepped portion 2A formed on the rotor 2 are aligned, there is a gap in a portion in which the hollow shaft 1 and the rotor 2 are mounted, and even if the hollow shaft 1 is moved in the axial direction, the allowance is formed corresponding to the portion of the gap, and the rotor 2 is not moved due to the portion of the allowance, and the rotor 2 is prevented to collide against the cover portion 7 or the pressure plate 18.
In addition, according to the vane pump 10 of the first embodiment, since the mechanical seals 4A, 4B are disposed on the both end portions in the axial direction (the body portion 8 side end portion and the cover portion 7 side end portion) of the vane pump 10, and the relief circuit 5 for protection communicating the mechanical seal 4A of the body portion 8 side end portion with the mechanical seal 4B of the cover portion 7 side end portion is provided, the mechanical seal 4A is communicated with the intake port 14 through the relief circuit 9 for mechanical seal, the pressure operating on the mechanical seal 4B of the cover portion 7 side end portion can be relieved to the relief circuit 9 for mechanical seal via the relief circuit 5 for protection.
Thus, even if an excessive pressure operates on the mechanical seal 4B of the cover portion 7 side end portion, breakage of the mechanical seal 4B is prevented.
Subsequently, the second embodiment of the present invention will be explained hereinafter with reference to
In the first embodiment shown in
Constructions shown in
In
The vane pump 20 includes the body portion 28 and the cover portion 27.
The body portion 28 located on the left side in
A bearing bush 39 is disposed in the body portion 28 and the cover portion 27, respectively, and the hollow shaft 21 is supported in a rotatable manner by the bearing bush 39.
The pressure plates 38, 38 are disposed on the cover portion 27 side (right side in
The pressure plates 38, 38 are disposed on the body portion 28 side (left side in
The rotor 22 and the cam ring 26 accommodated in the body portion 28 and the rotor 22 and the cam ring 26 accommodated in the cover portion 27 are disposed by ensuring an appropriate distance by means of the intermediate plate 40.
On the pressure plates 38, 38, a pressure loading circuits 37, 37 are formed, and the pressure loading circuit 37 communicates with a pressure-oil storage portion for vane, not shown, and also communicates with ejection circuits 35-1, 35-2 for the working fluid which will be described hereinafter.
On the body portion 28 of the vane pump 20, an intake port 34 for the working fluid is provided, and the intake port 34 communicates with a pump chamber (not shown in
On the body portion 28 and the cover portion 27, ejection ports 36-1, 36-2 for the working fluid are provided, respectively, and the ejection ports 36-1, 36-2 communicate with the ejection circuits 35-1, 35-2 for the working fluid on the cam ring 26 side (via a circuit, not shown), respectively.
As shown in
The mechanical seals 24, 24 are disposed on the both end portions in the axial direction of the vane pump 20, that is, on the body portion 28 side end portion (left side in
On the body portion 28, the relief circuit 29 for mechanical seal is formed, and the relief circuit 29 for mechanical seal communicates the back portion of the mechanical seal 24A of the body portion 28 side end portion (left end portion in
Further, the back portion of the mechanical seal 24A (mechanical seal on the left side in
The mechanical seal 24B (mechanical seal on the right side in
The other constructions and operative effects of the second embodiment shown in
The third embodiment to the sixth embodiment of the present invention will be described with reference to
First, the third embodiment of the present invention will be explained with reference to
In a case that the vane pump 50 is mounted on the transmission device 101 as shown in
In
In
In a state shown in
As the result of insertion of the key 52 in the keyway 53, the input shaft 103 and the hollow shaft 51 become capable of relative movement merely in the axial direction of the hollow shaft 51 for a distance corresponding to a difference in the axial length between the keyway 53 and the key 52, and the thrust force from the input shaft 103 to the hollow shaft 61 is not transmitted. However, with regard to the circumferential direction, the hollow shaft 51 and the input shaft 103 are not capable of relative rotation, and the torque is transmitted from the input shaft 103 to the hollow shaft 51.
In the first embodiment shown in
On the other hand, in the third embodiment in
By supporting the hollow shaft 51 by the bearing bushes 19 and 54 (supporting members) in the both-end supporting manner, the hollow shaft 51 can be centered in parallel with the input shaft 103 and with high accuracy in a manner that rattling or the like does not happened relative to a case that the hollow shaft 51 is supported by a single bearing bush (supporting member). Thus, pump efficiency can be improved.
The supporting member may be also constructed by the bearing bushes 19 and 54 as shown in drawings. Alternatively, a film of a material improving abrasion resistance may be formed on a surface of the insertion hole of the case 8 or the hollow shaft 51 of the cover portion 7 so as to support the hollow shaft 51 directly (direct bearing). Moreover, it may be such constructions that the bearing bush is used on one side in the axial direction, while the other side is constructed as the above-mentioned direct bearing manner.
Here, in a case that the bearing bush 54 is provided, the relief circuit 5, 25 for protection as shown in the embodiment in
Thus, in
In other words, in the third embodiment shown in
The relief circuit 55 for protection (relief circuit for mechanical seal) has a length dimension and pipe resistance which are smaller than those of the relief circuits 5, 25 for protection in the embodiment shown in
Here, the constructions of both-side supporting of the hollow shaft 51 by providing the bearing bush 54 in addition to the bearing bush 19 and the constructions of providing the relief circuit 55 for protection communicating directly the mechanical seal 4B on the cover portion 7 side with the intake port 14 can be used also in the fourth embodiment, the fifth embodiment, the sixth embodiment and variations thereof which will be described hereinafter.
The other constructions and operative effects of the third embodiment shown in
Subsequently, the fourth embodiment of the present invention will be described with reference to
In the fourth embodiment shown in
In
On the protruding portion 61A of the hollow shaft 61, the engagement groove 61B into which the spring pin 62 is inserted is formed (opened), and the engagement groove 61B is formed on the same diameter of the hollow shaft 61 at a pair of positions being symmetrical to the shaft core in the circumferential direction of the hollow shaft 61.
The engagement groove 61B has a long hole shape (or a groove state) which long hole is opened in the body portion 8 side end portion (right side in
The spring pin 62 is formed having a hollow cylindrical shape having a notch portion 62A extending in the axial direction, and the diameter of the spring pin 62 is changed (enlarged) by an elastic repulsive force. The spring pin 62 is fitted in a state that the diameter of the spring pin 62 is contracted when the pin 62 is inserted into the engagement groove 61B and a through port, not shown, of the rotation driving shaft 103. And the axial length of the spring pin is designed so as to be larger than the diameter of the hollow shaft.
In the input shaft 103 (see
When the input shaft 103 and the hollow shaft 61 are to be connected, the spring pin 62 is inserted and fitted into one of the engagement grooves 61B, 61B of the hollow shaft 61, the pin hole of the input shaft 103 (not shown in
In a state that the input shaft 103 and the hollow shaft 61 are connected, the elastic repulsive force operates to the spring pin 62 so as to enlarge outwardly in the radial direction, and the spring pin 62 presses one of the engagement grooves 61B of the hollow shaft 61, the pin hole of the input shaft 103 (not shown in
The other constructions and operative effects of the fourth embodiment shown in
The fifth embodiment will be described with reference to
In the fifth embodiment shown in
In
In the protruding portion 71A of the hollow shaft 71, the plurality of accommodating portions 71B for accommodating the engagement balls 72 and the pressing bolts 73 are disposed at the same interval in the circumferential direction. As shown in
Each of the accommodating portions 71B is formed integrally with the hollow shaft 71, is formed cylindrically, and protrudes outwardly from the outer peripheral surface of the hollow shaft 71.
The hollow portion of the accommodating portion 71B is formed so as to extend in the radial direction of the hollow shaft 71, and a female screw being screwed with the pressing bolt 73 is formed in the inner peripheral surface of the hollow portion.
Though an inner end portion in the radial direction of the accommodating portion 71B is opened to an inner peripheral surface side of the hollow shaft 71, a sectional area of an opening in the inner end portion in the radial direction of the accommodating portion 71B is designed so as to be smaller 1 than a sectional area of the engagement ball 72. Thus, in a case that the engagement ball 72 is disposed in the hollow portion of the accommodating portion 71B, a distal end side (an end portion in the radial direction of the hollow shaft 71) of the engagement ball 72 merely protrudes to the inner peripheral surface side of the hollow shaft 71 from the opening but the entire engagement ball 72 does not moved to the inner peripheral surface side of the hollow shaft 71.
By tightening the pressing bolts 73 in each of the accommodating portions 71B uniformly, the engagement ball 72 is pressed inwardly in the radial direction by the pressing bolt 73, and a distal end of the engagement ball 72 protrudes uniformly to the outer peripheral surface of the input shaft 103 (see
Here, the number of accommodating portions (engagement balls, pressing bolts) is not limited to three. The accommodating portions may be provided in two if they are disposed at an equal interval in the circumferential direction of the hollow shaft 71, or may be provided in four or more. However, as shown in
The number of accommodating portions is not particularly limited if the shaft cores of the input shaft 103 and the hollow shaft 71 are not offset.
The accommodating portion 71B may be formed integrally with the hollow shaft 71 as shown in
The other constructions and operative effects of the fifth embodiment in
Subsequently, the sixth embodiment will be described with reference to
In the sixth embodiment shown in
In
On the other hand, in the hollow shaft 81, there are large diameter portions 81B and 81C, in which the spline is not formed, on a distal end side (the vane pump body portion 8 side: right end side in
The large diameter portions 81B and 81C of the hollow shaft 81 and the non-spline portions 103B and 103C of the input shaft 103 construct a lubricant-oil filling space (large diameter portion) in which the lubricant oil (grease oil, for example) is filled.
In
After the grease oil is filled in the large diameter portions 81B, 81C on the distal end side and the rear end side (the right end side and the left end side in
In a case that the vane pump is to be driven by the internal combustion engine, the torque fluctuation specific to the internal combustion engine operates to the splines through the input shaft, the teeth of the male and female splines collide against each other (teeth are hit by each other), and there, surfaces of the teeth of the splines are damaged.
On the other hand, in the sixth embodiment shown in
The other constructions and operative effects of the sixth embodiment shown in
Here, a variation of the sixth embodiment will be described with reference to
In the sixth embodiment shown in
On the other hand, in the variation of the sixth embodiment, as shown in
When the input shaft 103 (rotation driving shaft,
The other constructions and operative effects of the variation shown in
The embodiments shown in drawings are merely exemplifications and it should be noted that the descriptions of the embodiments are not intended to limit the technical scope of the present invention.
In the embodiments shown in drawings, the input shaft 103 of the transmission device 101 is inserted into the hollow portion of the hollow shafts 1, 21, 51, 61, 71, 81, 91, however, the output shaft 105 of the motor 102 (driving source) such as a motor can be inserted into the hollow portion of the hollow shafts 1, 21, 51, 61, 71, 81, 91, for example.
REFERENCE CHARACTERS LIST
- 1, 21, 51, 61, 71, 81, 91 hollow shaft
- 1A shaft-side recess portion
- 2, 22 rotor
- 2A rotor-side stepped portion
- 3, 23 wire ring
- 4 (4A, 4B), 24 (24A, 24B) mechanical seal
- 5, 25 relief circuit for protection
- 6, 26 cam ring
- 7, 27 cover portion
- 8, 28 body portion
- 9, 29, 55 relief circuit for mechanical seal
- 10, 20, 50, 60, 70, 80, 90 vane pump
- 11, 31 vane
- 11G vane groove
- 12 pressure-oil storage portion for vane
- 13, 33 intake circuit
- 14, 34 intake port
- 15, 35 (35-1, 35-2) ejection circuit
- 16, 36 (36-1, 36-2) ejection port
- 17, 37 circuit for pressure loading
- 18, 38 pressure plate
- 19, 39, 54 bearing bush
- 40 intermediate plate
- 52 key
- 53 keyway
- 61B engagement groove
- 62 spring pin
- 71B accommodating portion
- 72 engagement ball
- 73 pressing bolt
- 82 square ring (sealing member for lubricant oil)
- 92 spline seal (sealing member for lubricant oil)
- 101 transmission device
- 102 driving source
- 103 input shaft
- 105 output shaft
- B joining bolt
- H bolt hole
- α pump chamber
Claims
1. A vane pump comprising a hollow shaft, wherein
- the hollow shaft is constructed such that a rotation driving shaft of a driving source can be inserted into a hollow portion; and
- the hollow shaft and the rotation driving shaft are connected by a mechanism for transmitting a torque but transmitting no thrust.
2. The vane pump according to claim 1, wherein
- a rotor is mounted on said hollow shaft.
3. The vane pump according to claim 2, wherein
- said hollow shaft and the rotor are mounted such that relative rotation is not possible and movement in an axial direction is limited by a wire ring; and
- the wire ring is disposed in a mode across a shaft-side recess portion and a rotor-side stepped portion in a state where the shaft-side recess portion formed on said hollow shaft and the rotor-side stepped portion formed on the rotor are aligned.
4. The vane pump according to claim 1, wherein
- a mechanical seal is provided on both end portions in the axial direction of said hollow shaft; and
- a circuit for allowing the mechanical seals on the both end portions to communicate is formed.
5. The vane pump according to claim 1, wherein
- said mechanism for transmitting a torque but transmitting no thrust is splines formed on an inner peripheral surface of the hollow shaft and an outer peripheral surface of the rotation driving shaft.
6. The vane pump according to claim 1, wherein
- said mechanism for transmitting a torque but transmitting no thrust is a key and a keyway.
7. The vane pump according to claim 1, wherein
- said mechanism for transmitting a torque but transmitting no thrust preferably has an engagement groove penetrating the hollow shaft, a through hole of the rotation driving shaft, and a spring pin capable of insertion into the engagement groove and the through hole.
8. The vane pump according to claim 1, wherein
- said mechanism for transmitting a torque but transmitting no thrust is constructed by splines formed on the outer peripheral surface of the rotation driving shaft and the inner peripheral surface of the hollow shaft;
- the spline is formed only in a region in the vicinity of the vane in the axial directions of the rotation driving shaft and the hollow shaft;
- a region where the splines are not provided in the rotation driving shaft and the hollow shaft constructs a lubricant-oil filling space in which a lubricant oil is filled; and
- a sealing member for the lubricant oil is provided in a region on a side separated from a cover portion.
9. The vane pump according to claim 1, wherein
- said mechanism for transmitting a torque but transmitting no thrust is constructed by splines formed on the whole region in the axial direction of the outer peripheral surface of the rotation driving shaft and the inner peripheral surface of the hollow shaft;
- a sealing member for the lubricant oil is disposed in a region on a side separated from the cover portion;
- the sealing member has projections and recesses formed on an outer periphery thereof; and
- the projections and recesses are formed correspondingly to the spline formed on the inner peripheral surface of the hollow shaft.
10. The vane pump according to claim 1, wherein
- the hollow shaft is supported by a supporting member disposed on a side separated from the cover portion and a supporting member disposed in the vicinity of the cover portion.
11. The vane pump according to claim 10, wherein
- a circuit allowing a mechanical seal on the cover portion side and an intake portion to communicate is formed.
12. The vane pump according to claim 5, wherein
- the hollow shaft is supported by a supporting member disposed on a side separated from the cover portion and a supporting member disposed in the vicinity of the cover portion.
13. The vane pump according to claim 12, wherein
- a circuit allowing a mechanical seal on the cover portion side and an intake portion to communicate is formed.
Type: Application
Filed: Oct 18, 2017
Publication Date: Jan 9, 2020
Applicants: NIPPON OIL PUMP CO., LTD. (Kumagaya-shi, Saitama), KANZAKI KOKYUKOKI MFG. CO., LTD. (Amagasaki, Hyogo)
Inventors: Kunimitsu TAKANI (Kumagaya-shi, Saitama), Shigenori SAKIKAWA (Amagasaki, Hyogo), Yoshimune YAMAOKA (Amagasaki, Hyogo), Akihiro IMA (Amagasaki)
Application Number: 16/347,586