Abstract: A method and a device for detecting the oil level in a hydraulic pulse unit at an impulse type power wrench, wherein the pulse unit comprises an oil filled pulse chamber, a motor driven inertia drive member, and a kinetic energy receiving member connected to an output shaft and intermittently coupled to the inertia drive member via an oil cushion to receive kinetic energy from the inertia drive member during repeated energy transfer phases. The rotation speed of the inertia drive member is measured both at the start of a pulse generating phase and at the end of that phase, wherein the two measured speeds are compared to each other, and when the speed at the end of the pulse generating phase exceeds the speed at the end of that phase by a certain percentage a faulty signal is emitted indicating a too low oil level in the pulse unit.

Abstract: An impact torque generator for a hydraulic torque wrench includes a liner, a main shaft, a first drivable blade and a second drivable blade. The liner has two sealing surfaces defined at a position of 180 degree rotational symmetry. For each of the first drivable blade and the second drivable blade, a first sealing surface of the drivable blade is configured to be in contact with one of the sealing surfaces of the liner while a second sealing surface of the drivable blade slides in contact with an inner peripheral surface of the liner so as to create a seal such that a portion of an interior of the liner is divided into a high-pressure chamber and a low-pressure chamber so as to generate impact torque on the main shaft.

Abstract: A torque limiter for transmitting motion from a drive shaft to a driven member, and for selectively disconnecting the driven member from the drive shaft when a predetermined transmitted twisting torque value is exceeded. The torque limiter has a hub fitted to the drive shaft; a rotary first flange fixed to an axial end of the hub; a second flange fixed to the driven member; and a number of modules fitted to the first flange. The first flange is fixed to the hub. The modules are equally spaced along the annular portion of the first flange, and one appendage is located between each two adjacent modules.

Abstract: A hydraulic cylinder device includes a cylinder, an axle and two blade units. The cylinder includes a chamber with a cross-sectional shape like a circle overlapping another circle. The axle is inserted through the cylinder. The axle includes two opposite grooves defined therein. Each of blade units includes a blade, a primary roller and a secondary roller. The blade is movably disposed in a related one of the grooves and made with a groove defined in a side close to an internal side of the cylinder. The secondary roller is disposed in the groove. The primary roller is disposed in the groove so that the primary roller is in contact with the secondary roller on one hand and in contact with the cylinder on the other hand.

Abstract: A control system for a vehicle having first and second wheels is provided that includes a differential apparatus adapted to distribute torque between the first and second wheels and a traction controller for controlling operation of the differential apparatus from vehicle launch up to a predetermined vehicle speed. The traction controller is configured to engage the differential apparatus in a first operating state according to at least one vehicle operating parameter indicative of a low traction operating condition and to further control engagement of the differential apparatus in a second vehicle operating state during the low traction operating condition according to a difference between an actual vehicle yaw rate and a predetermined target vehicle yaw rate. The control system also includes a stability controller for controlling engagement of the differential apparatus at or above the predetermined vehicle speed.

Abstract: A device for controlling the activation of an apparatus by a motor, intended to be inserted between, the operation output of the motor and the operation input of the apparatus whose activation is to be controlled. The device includes: —a blade pump having a rotor, at least one blade carried by this rotor and a rotary body forming a pumping chamber missing an outlet, and one of the component parts, among the rotor and the rotary body, being connected to the operation output of the motor, whilst the other of these component parts is connected to the operation input of the apparatus to be controlled; —and a supply intended to supply liquid to the pumping chamber.

Abstract: An impulse torque generator for a hydraulic torque wrench is durable, compact in size and capable of stably generating a large impulse torque while eliminating a blade being inserted in the main shaft. A main shaft has a cam thereon positioned to be slidable in an axial direction without turning against the main shaft. Oil guide holes pass in an axial direction inside the cam. A cylinder receives the base end of the main shaft and the cam, and forms oil chambers to be filled with an operating fluid across the cam. Pins are inserted in the cam groove of the cam, provided projecting from the inner circumferential face of the cylinder. A drive shaft is to be connected to a drive source which rotatively drives the cylinder. A check valve shuts off the circulation of operating fluid between the oil chambers formed across the cam by selectively closing the oil guide holes formed in the cam, depending on the relative rotating angle between the cam and the cylinder.

Abstract: The objective of the present invention is to provide an impulse torque generator for a hydraulic torque wrench, which is durable, compact in size and capable of stably generating a large impulse torque, by eliminating the blade inserted in the main shaft.

Abstract: A hydraulic torque impulse generator (16) of the kind having a motor rotated drive member (18;50) formed with a fluid chamber (19;53), an impulse receiving output member (20;51) coaxial with the drive member (18;50) and extending into the fluid chamber (19;53), a hydraulic peak generating mechanism (24-27;54-59) in the fluid chamber (19;53) for producing torque impulses at relative rotation between the drive member (18;50) and the output member (20;51), and a variable volume accumulator chamber (32;64) located in the drive member (18;50) and connected to the fluid chamber (19;53) for compensating for occurring volume changes in the hydraulic fluid, wherein the accumulator chamber (32:64) is divided into a first compartment (40;71) and a second compartment (42;72) by an elastically deflectable membrane (39;73), a passage (43;65) connects the first compartment (40;71) to the fluid chamber (19;53), and the second compartment (42;72) comprises at least partly a yeildable means for biassing the membrane (39;73) to

Abstract: A hydraulic torque impulse generator having a drive member (10) with a fluid chamber (12) and an output spindle (11) extending into the fluid chamber (12) and being provided with a movable seal element (19) and an axial seal ridge (22) for cooperation with oppositely disposed axial seal lands (13, 14) in the fluid chamber (12) to, thereby, divide the fluid chamber (12) into one high pressure compartment (H.P.) and one low pressure compartment (L.P.) during a limited angular interval of relative rotation between the drive member (10) and the output spindle (11), and a valve means comprising an elongate contact element (24, 44) which is supported in an axial groove (23, 43) in the seal ridge (22 ), which groove (23, 43) communicates with the high pressure compartment (H.P.) such that the contact element (24, 44) is urged into its sealing condition by the fluid pressure at pressure magnitudes above a certain level.

Abstract: An impulse torque generator, for a hydraulic impulse torque wrench, includes a liner driven by a rotor. The liner has an inner cavity with at least two pairs of sealing surfaces around its inner peripheral surface. A main shaft extends coaxially through the liner and includes at least two projections. Also, at least two driving blades are provided for generating an impulse torque on the main shaft by abutting the projections of the main shaft.

Abstract: A hydraulic torque impulse mechanism intended for a torque delivering tool and including a rotatively driven drive member (10) provided with a concentric fluid chamber (12) and radially acting cam elements (25, 26, 28), an output shaft (16) extending through the drive member (10) fluid chamber (12) and having two radial cylinder bores (18, 19) which communicate continuously with a central high pressure chamber (23) and support two piston elements (20, 21) which are reciprocable in the cylinder bores (18, 19) by the cam elements (25, 26, 28), whereby the output shaft (16) comprises two moderating chambers (45, 46) which communicate continuously with the high pressure chamber (23) and comprise a pressure responsive yielding system in the form of membranes (50) which are supported by end closures (47) of the moderating chambers (45, 46) and which are elastically deformable by the pressure difference between the high pressure chamber (23) and the fluid chamber (12) as this pressure difference is below a certain l

Abstract: A hydraulic torque impulse generator includes a motor driven drive member (10) with a fluid chamber (23), an output spindle (11) extending into the fluid chamber, two diametrically opposite seal elements (12, 13) movably supported in axial slots (32, 33) in the output spindle for sealing cooperation with seal lands (24, 25) on the fluid chamber wall, axially extending seal ribs (27-30) on both the fluid chamber wall and the output spindle, and a cam spindle (40) coupled to the drive member (10) and extending into a coaxial bore (34) in the output spindle for moving the seal elements outwardly towards the fluid chamber wall in two relative angular positions between the drive member and the output spindle. The cam spindle (40) has two diametrically opposite and differently shaped cams (41, 42) for alternative engagement with high and low lift cam followers (45-50) on the seal elements (12, 13).

Abstract: A hydraulic torque impulse generator comprises a hollow drive member (21) connected to a rotation motor (16) and comprising a fluid chamber (24) with axially extending seal lands (35, 36) and seal ridges (40, 41) on its peripheral wall for sealing cooperation with radially movable seal elements (33, 34) and axially extending seal ridges (38, 39) on an output spindle (18, 22) to divide the fluid chamber (24) into high pressure compartments (H.P.) and low pressure compartments (L.P.) during short intervals of the relative rotating between the drive member (21) and the output spindle (18, 22). The fluid chamber (24) is defined also by two opposite end walls (25, 28), one (25) of which comprises an annular, nonresilient contact element (37) which is axially displaceable between an active seal position in which it is urged against the seal elements (33, 34) and shoulders (43, 30) on the spindle portion (22) and the fluid chamber wall (20), respectively, and a rest position.

Abstract: A hydraulic torque impulse generator uses a dual piston arrangement to provide impacts to a rotative anvil and automatic shut-off and control apparatus for limiting the pressure without reversing the direction of the driving clutch cage, a pressure venting arrangement permitting one impact per revolution.

Abstract: A pressure detecting device in a torque control wrench has a rotor to be rotated by high pressure air, an output shaft and a device for generating impulse torque with the use of oil pressure on the output shaft due to rotation of the rotor. The device has a liner rotated by the rotor rotatably mounted on the output shaft. The device forms a high pressure chamber and a low pressure chamber in the liner for the generation of impulses on the output shaft, and has a hole therein having first and second ports communicating with the high and low pressure chambers, respectively. A valve is disposed in the hole for adjustably regulating the flow of oil from the first port to the second port and for generating a shut-off signal. The valve has a valve shaft adjustably mounted in the hole, having a passage therein communicating with the high pressure chamber. The passage has an opening at an end of the valve shaft.

Abstract: An oil pressure type impulse torque generator for a wrench. Either one of both seal surfaces on the main shaft side and the liner side is made a variable type by floating in order to eliminate "burning" and wear at the seal surfaces. The seal surfaces may be formed by rollers.

Abstract: A hydraulic torque impulse generator comprises a drive member (10) connected to a rotation motor and including a cylindrical fluid chamber (12) partly defined by a circumferential wall (14), and an output spindle (13) rotatably supported in coaxial relationship with the drive member (10) and having a rear portion (15) extending into the fluid chamber (12). The rear spindle portion (15) has two radial slots (18, 19) each supporting a radially movable seal element (21, 22) for sealing cooperation with seal lands (23, 24) on the fluid chamber wall (14). First seal ridges (25, 26) are provided on the rear spindle portion (15) for sealing cooperation with second seal ridges (28, 29) on the fluid chamber wall (14), thereby dividing the fluid chamber (12) into two high pressure compartments (H.P.) and two low pressure compartments (L.P.) during two short intervals of each revolution of the drive member (10) relative to the output spindle (13).

Abstract: A hydraulic torque impulse generator comprising a rotationally driven drive member (10; 50), a hydraulic fluid chamber (16; 51) confined in the drive member (10; 50), an output spindle (18; 53) having a rear impulse receiving portion (17; 52) extending into the fluid chamber (16; 51), at least two radially slidable vanes (23, 24; 58, 60) carried by the rear spindle portion (17; 52) and cooperating with corresponding seal portions (25, 26; 62, 63, 64) on the fluid chamber wall, axially extending seal ribs (29, 30; 65, 66, 67) on the fluid chamber wall and corresponding axially extending seal ribs (27, 28; 68, 70) on the rear spindle portion (17; 52). Simultaneous sealing cooperation is obtained more than once during each revolution of the drive member (10; 50) relative to the output spindle (18; 52), whereby the fluid chamber (16; 51) is momentarily divided into at least two high pressure compartments (H.P.) and at least two low pressure compartments (L.P.).

Abstract: An impulse unit (10) is disclosed which provides for a symmetric transfer of torque between a case (16) and spindle (18) selectively for one or two impulses for each relative rotation between the case and spindle. A pair of cylindrical rollers (84, 86) is provided to isolate two symmetric chambers between the case and spindle to transfer torque therebetween. The use of cylindrical rollers reduces the overall wear in the tool, improves oil sealing capability during long time use, and reduces the cost of manufacture.

Abstract: A hydraulic torque impulse generator comprises a motor rotated drive member (16) including a fluid chamber (18) into which the rear end portion (19) of an output spindle (21) extends to receive torque impulses generated in said fluid chamber (18). The rear end portion (19) of the output spindle (21) carries a radially sliding vane (23) for cooperation with the fluid chamber (18) such that a high pressure compartment and a low pressure compartment are accomplished during a limited portion of the relative rotation between the drive member (16) and the output spindle (21). A seal barrier (43-50) around the output spindle (21) prevents fluid leakage from the fluid chamber (18). The seal barrier comprises a clearance seal (43) between the fluid chamber end wall (38) and a low pressure area which is sealed off to the atmosphere by low pressure seal rings (47, 48, 60).

Abstract: A communication passageway is formed to extend from the end surface of a cover member opposed to the axial end surface of the shoulder portion of a main shaft and through the main shaft so that in only one of the two particular phase conditions obtained per revolution of an oil cylinder, it establishes the communication between high and low pressure chambers to thereby equalize their pressures.The communication passageway establishes the communication between high and low pressure chambers in only one of the two particular phase conditions obtained per revolution of the oil cylinder and makes it possible to produce percussion torque in the other particular phase condition.

Abstract: A hydraulic torque impulse generator comprises a drive member (10) drivingly connected to rotation motor and including a cylindrical fluid chamber (11) which is partly defined by a circumferential wall (23) of a non-constant radius, an output spindle (12) rotatably supported in a coaxial relationship with said drive member (10) and comprising a rear portion (13) which extends into said fluid chamber (11) and which has two radial slots (29, 30) in which seal rollers (27, 28) are radially movable. The drive member (10) has a rear end wall (20) which is formed with a forwardly extending hub portion (25) on which is rigidly attached a cam element (26) for positive engagement with the seal rollers (27,28) to move the latters outwardly toward the fluid chamber wall (23) during rotation of said drive member (10) relative to said output spindle (12).

Abstract: This invention relates to an impulse wrench which has two blades but generates only one impact pulse on the main shaft per one rotation of a liner. In this invention, a liner has at least four seals and a main shaft has at least two seals. And the shape of both or one of the two seals out of at least two seals of main shaft is other than a linear shape parallel to the axial center.If both of said two seals of main shaft are in said shape, two of at least four seals of liner are in the same shape. The other seals of liner are in a linear shape parallel to the axial center.If one of said two seals of main shaft is in said shape, one of at least four seals of liner is in the same shape as this. All of the other seals of liner are in a linear shape parallel to the axial center.In this way, said two seals of liner and said two seals of main shaft coincide with each other only once per one rotation of the liner.

Abstract: A hydraulic torque impulse generator comprising a drive member (10) drivingly connected to a rotation motor and formed with a fluid chamber (11), and an output spindle (12) extending into the fluid chamber (11). Two radially movable seal elements (14, 15) of cylindrical shape are supported in a through slot (13) in the output spindle (12) and are arranged to sealingly cooperate with two axially extending ridges (17, 18) in the fluid chamber (11). A first set of two diametrically opposed and helically extending seal ribs (19, 20) on the drive member (10) is arranged to sealingly cooperate with a second set of two diametrically opposed and helically extending seal ribs (21, 22) on the output spindle (12).

Abstract: A hydraulic torque impulse tool, comprising an inertia drive member (10;110) which is rotated by a motor and which includes a fluid chamber (19;119), and a seal and torque transmitting mechanism (30;130) which is arranged to divide the fluid chamber (19;119) into two compartments (38, 39; 138, 139) during a short interval of the relative rotation between the drive member (10;110) and the output spindle (11;111). A leaf spring valve (72; 171, 172) is arranged to control the flow through a bypass passage (70;170) interconnecting the two fluid chamber compartments (38, 39; 138, 139). The leaf spring valve (72;171, 172) which by its shape is pretensioned toward open condition automatically occupies the open condition as the difference in pressure between the fluid chamber compartments is low and a closed condition as this difference exceeds a certain level.

Abstract: A hydraulic torque impulse tool, comprising an inertia drive member (10) which is rotated by a motor and which includes a fluid chamber (19), and a seal and torque transmitting mechanism (30) which is arranged to divide the fluid chamber (19) into two compartments (38, 39) during a short interval of the relative rotation between the drive member (19) and the output spindle (11). An annular leaf spring valve (82) is arranged to control the flow through a bypass passage (70,81, 79) interconnecting the two fluid chamber compartments (38, 39). The leaf spring valve (82) which by its shape is pretensioned toward open condition automatically occupies the open condition as the difference is pressure between the fluid chamber compartments (39, 39) is low and a closed condition as this difference exceeds a certain level.

Abstract: A rotary drive apparatus having a drive shaft driven by a pair of start-and-stop rotary elements. Each element has a plurality of angularly spaced vanes which are interspersed with associated vanes on the drive shaft to form substantially sealed fluid chambers. Gas compression and expansion in alternate fluid chambers produced by relative rotational movement of the rotary elements with respect to the shaft acts to drive the shaft at a relatively constant velocity.

Abstract: An oil pressure type pneumatic torque wrench which comprises a main shaft, a liner rotatable by a rotor with at least four seal points which are formed on the inner circumferential surface of the liner and two blades provided on the main shaft. The center of two opposing seal points on each of the shaft and liner are spaced equal distances from diametrical lines thereof so that each rotation of the liner produces one impulse.

Abstract: In a hydraulic torque impulse tool having a power rotated inertia drive member (10; 110) and a hydraulic fluid chamber (19; 119) a piston (30; 130) is supported in the fluid chamber (19; 119) for reciprocating movement in a plane transverse to the rotation axis of the drive member (10; 110). The piston (30; 130) and the output spindle (11; 111) are provided with cam means (42, 43, 44; 142, 143, 144) by which the piston (30, 130) is reciprocated in the fluid chamber (19; 119) at relative rotation of the drive member (10; 110) and the output spindle (11; 111) of the tool. The piston (30; 130) and the fluid chamber (19; 119) have seal means (31, 28; 131, 128) by which one fluid chamber compartment (38; 138) is sealed off from another (39; 139) during a certain portion of each piston stroke, thereby accomplishing an instantaneous pressure build-up in one of the fluid chamber compartments.