Abstract: In an internal-gear type fluid device, guide teeth are formed by inner teeth at an outer rotor, and vane portions extending in the width direction are formed at tooth tip portions of the guide teeth. Further, guide teeth are formed by outer teeth at the inner rotor, and vane portions extending in the width direction are formed at tooth tip portions of the guide teeth. Since the vane portions are thus formed at the outer rotor and the inner rotor, the confinement timing when oil confinement is completed can be synchronized with the release timing when oil release is started, by adjusting, for example, the thickness of the vane portions without changing the profile of the guide teeth.

Abstract: This invention provides both a pump and a lubrication and cooling system with a pump which includes a pump housing, a rotor, a relief valve and a bypass valve. The relief valve is configured to relieve pump pressure when the pump pressure is indicative of an abnormal restriction of flow. The bypass valve is configured to direct fluid flow from an outlet chamber of the pump to an intake chamber of the pump when pressure in the outlet chamber is at a value associated with a predetermined speed of rotor rotation.

Abstract: A positive displacement capture apparatus contains a plurality of positive displacement capture devices which each contain a rotor portion positioned inside a casing portion to act as a least area rotor which captures a volume and moves the volume along the length of the separator. The rotor portion contains a plurality of lobes which interact with grooves in the casing portion, such that the interaction of the lobes and grooves create barriers which capture the volume. The creation of the volume creates a flow barrier between a downstream end of the separator and an upstream end of the separator. The flow separator is coupled to a combustion portion to provide a flow of material to the combustion portion. The plurality of positive displacement capture devices are positioned, oriented and rotational timed such that eccentric loads created by the rotation of the rotor portions cancel each other out during operation.

Abstract: A pump comprises a driving rotor and a driven rotor that are positioned in a housing such that, as the driving rotor and the driven rotor rotate, the teeth of the driving rotor and the teeth of the driven rotor mesh to form a positive displacement seal. The teeth of the driving rotor and the driven rotor are configured such that seals between the inlet side and the discharge side of the pump are formed between only the leading surfaces of the teeth of the driving rotor and the trailing surfaces of the teeth of the driven rotor.

Abstract: Provided is a uniaxial eccentric screw pump which can prevent the life of a bearing sliding portion from decreasing due to a thrust load applied from a high pressure side to a low pressure side. An external thread-like motor directly coupled with a driving shaft is rotated and eccentrically moved with respect to the axis of a stator to deliver a fluid from an intake side to a discharge side. The pump is provided at an end of the discharge side of the motor and extends toward the discharge side in the axial direction of the stator. The uniaxial eccentric screw pump includes an annular small-diameter portion and a seal member. The seal member 16 is in a sliding contact with the outer surface of the small-diameter portion 4p, and seals the end of a sliding portion between a self-lubricating bearing 5 on the discharge side and the stator 4.

Abstract: A housing includes a pump chamber, which rotatably receives an inner rotor and an outer rotor that define a pressure chamber therebetween. An inlet port of the housing is communicated with the pressure chamber to supply fluid into the pressure chamber. An outlet port of the housing is communicated with the pressure chamber to discharge the fluid from the pressure chamber. An axial size of an axial clearance, which is formed between an axial end surface of the pump chamber and an axial end surface of the inner rotor, differs from an axial size of an axial clearance, which is formed between the axial end surface of the pump chamber and an axial end surface of the outer rotor.

Abstract: An oil pump having an inner rotor with of external teeth; an outer rotor that is eccentrically provided and has internal teeth that mesh with the inner rotor external teeth, and an oil pump body that accommodates the outer and inner rotors. By rotationally driving the inner rotor to increase and decrease a space between the internal and the external teeth, an intake stroke suctions hydraulic oil from the oil pump body and a discharge stroke discharges the suctioned hydraulic oil to a discharge port formed in the oil pump body. Between the intake and discharge strokes, a confinement stroke cuts off the suctioned hydraulic oil and confines the suctioned hydraulic oil in the space, and a compression stroke reduces the space and compresses the confined hydraulic oil. Further, an interval is set between a finish end portion of the intake port of the oil pump body and a start end portion of the discharge port such that a rotation angle of the inner rotor during the compression stroke is 21 to 27 degrees.

Abstract: A bearing is located with movement of an outer race in the longitudinal direction of a drive shaft being restricted, and the drive shaft is fixed to an inner race with the press fit, so that, it is possible to prevent the drive shaft from escaping. In addition, the inner race is longer than the outer race. Therefore, it is possible to obtain sufficient strength of the press fit of the drive shaft in the inner race while suppressing the size of the outer race (in other words, suppressing the size of the pump device). As a consequence, the size of the pump device can be suppressed while increasing reliability of the function for preventing the drive shaft from escaping.

Abstract: The invention relates to a variable-volume internal gear pump, in particular for use as an engine lubrication pump for automobiles. The internal gear pump comprises a housing (7, 10) and a rotor set chamber (40) formed therein comprising a low pressure chamber (17) and a high pressure chamber (18) for a fluid. Inside the rotor set chamber (40) are an inner rotor (2) that can be rotatably driven by a shaft (1) about an axis of rotation (Di) and a rotatable outer rotor (3) with an outer rotor axis of rotation (Da) that is arranged eccentric with respect to the axis of rotation (Di). When a rotational force is applied, conveyance cells (30, 31) form between the inner rotor (2) and the outer rotor (3) in which the fluid is conveyed from the low pressure chamber (17) to the high pressure chamber (18). An adjusting member (5) upon which axial springs (8) act and which is guided in the internal gears (34) of the outer rotor (3) in axial motion causes a pressure-related axial movement of the inner rotor (2).

Abstract: The invention relates to a pump, in particular an oil pump, for internal combustion engines, comprising a pump case, with the pump case comprising a pump lid and a pump flange, with at least one toothed wheelset being arranged between the pump lid and the pump flange and the pump lid and the pump flange being connected via at least one distance element.

Abstract: An oil pump includes: an inner rotor rotatable with a drive shaft in a unified manner on a drive-rotation axis; an outer rotor which has inner teeth configured to engage with outer teeth of the inner rotor and is rotatable about a driven axis eccentric to the drive-rotation axis; and an adjustment ring for rotatably supporting the outer rotor. A guide means which allows the adjustment ring to rotate about the driven axis, while allowing the driven axis to revolve about the drive-rotation axis, is formed of: first and second arm portions provided on the adjustment ring; and first and second guide faces with which the first and second arm portions are brought into slidable contact.

Abstract: An oil pump in which pulsation vibration due to the dynamic pressure on the discharge port side can be attenuated. In an oil pump for transporting fluid from a suction port to a discharge port by the rotation of a rotor mounted in a pump casing, a resonator configured from an introduction path and a chamber is formed with respect to a discharge flow channel that communicates with the discharge port in the flow direction of the discharge flow channel. A channel in a direction different to the flow direction of the discharge flow channel is communicatingly formed in the vicinity of the resonator.

Abstract: The invention relates to a pump, in particular an oil pump, for internal combustion engines, comprising a pump case, with the pump case comprising a pump lid and a pump flange, with at least one toothed wheelset being arranged between the pump lid and the pump flange and the pump lid and the pump flange being connected via at least one distance element.

Abstract: The invention relates to a pump, in particular an oil pump, for internal combustion engines, comprising a pump case, with the pump case comprising a pump lid and a pump flange, with at least one toothed wheelset being arranged between the pump lid and the pump flange and the pump lid and the pump flange being connected via at least one distance element.

Abstract: An oil pump includes pump chambers each having a volume varied by engine drive and for pressurizing oil inhaled through an inlet port and discharge it through an outlet port, and a branch passage connected between upstream and downstream sides of the outlet port at branch and confluent points, wherein the branch passage in the vicinity of the confluent point is shifted in pulse-pressure phase with respect to the outlet port.

Abstract: A pump apparatus for transporting at least one fluid, comprising a shaft, wherein the shaft has a longitudinal axis; a motor, wherein the motor is adapted to rotate the shaft about the longitudinal axis; and, a plurality of gerotors, wherein the gerotors are attached to the shaft along the longitudinal axis and wherein the shaft rotation actuates the plurality of gerotors rotation, causing pumping of the at least one fluid.

Abstract: The aim of the invention is to obtain a cost-effective solution for providing a microsystem with bearings, which have sufficiently high precision and long-term stress resistance. The invention proposes a method for manufacturing, adapting or adjusting a bearing portion in a fluidal microcomponent (M) comprising a stator (30) and a rotor (40,2). Said rotor is rotatably supported on the at least one bearing portion (L10,L11) relative to said stator. Said rotor (40,2) is rotatably supported by a sleeve (10, 11) inserted into said stator (30), for forming said bearing portion, the at least one sleeve being inserted in said stator as a bearing sleeve and comprising an inner surface and an outer surface (10i, 10a; 11i, 11a). Before being inserted in said stator, said bearing sleeve (10, 11) is a separate bearing component comprising an inner surface (10i, 11i) as an inner bearing surface, which is mechanically micro-finished before being inserted into said stator (30).

Abstract: According to one embodiment of the invention, a gerotor apparatus includes a first gerotor, a second gerotor, and a synchronizing system operable to synchronize a rotation of the first gerotor with a rotation of the second gerotor. The synchronizing system includes a cam plate coupled to the first gerotor, wherein the cam plate includes a plurality of cams, and an alignment plate coupled to the second gerotor. The alignment plate includes at least one alignment member, wherein the plurality of cams and the at least one alignment member interact to synchronize a rotation of the first gerotor with a rotation of the second gerotor.

Abstract: Disclosed is a G-rotor pump in which a lid and a bottom of a pump housing are made of plastic. A spacer that supports the bottom is produced as a single piece with the lid, whereby the G-rotor pump can be embodied in a particularly inexpensive manner.

Abstract: A gerotor and methods for assembling the gerotor are disclosed. The gerotor includes a pump housing having a channel and a rotor positioning cavity, a pump shaft, an inner rotor, and an outer rotor. The pump shaft has central pump shaft axis and the inner rotor has a central inner rotor axis. The methods include: inserting the pump shaft through the channel; sliding the inner rotor onto the pump shaft at an oblique angle such that the central inner rotor axis is at least partially angularly offset from the central pump shaft axis; rotating the inner rotor to substantially align the central inner rotor axis and the central pump shaft axis and to engage the pump shaft with the inner rotor; and positioning the outer rotor around the inner rotor to maintain substantial alignment of the inner rotor with the pump housing and/or the pump shaft.

Abstract: A trochoid pump 10, comprising a driving shaft 13, wherein a drive gear 17 comprising of a bevel gear is fixed on one end thereof and a inner rotor 11 is penetrated onto the other end thereof, an outer rotor 12, the center of which is decentered to the inner rotor 11, wherein both rotors 11,12 are covered with the cap 15 and the casing 16, a first regulatory structure, wherein the driving shaft 13 or a means of control fixed on the driving shaft 13 regulates an one-way movement to the casing 16, a second regulatory structure, wherein an end face 13a on the other side of the driving shaft is 13 engaged with one end 15a of the cap 15 and regulates the other way movement of the cap, wherein the thrust of the driving shaft 13 is axially regulated by the first regulatory structure and by the second regulatory structure.

Abstract: A closed system rotary machine has an inner shaped element (1) and an outer shaped element (2) which define therebetween cavities or capsules having a variable volume (V1, V9). The contact points which define the capsules (C1, C9) are disposed along lines of action (CA1, CA2, CA3) which are concurrent at junction points BN and BM, where the cavities begin and end respectively. The contacts (C2) at points located on the tangent (T) common to both pitch circles (6, 7) are osculating elements with a shared centre of curvature which is situated at the rolling point (R) of the pitch circles (6, 7). The invention can be used to ensure that the capsules form and disappear very gradually and to facilitate the distribution of the capsules when they are forming and disappearing in order to increase the leak paths.

Abstract: A pumping apparatus includes a pump housing, a pumping member which is rotatable in the housing to pump fluid, the pumping member being provided on a support which is in use, driven, the housing including in communication with an inlet, a lower pressure region, and in communication with an outlet, a higher pressure region, there being a passage for fluid from the higher pressure region to the lower pressure region through the support when the fluid pressure in the higher pressure region exceeds a threshold value.

Abstract: A trochoid oil pump, which enables the endurance to be increased and the reduction of discharge pulsations and noise to be achieved, and in which those results can be realized with a very simple structure. An interdental space constituted by an inner rotor and an outer rotor having trochoid tooth profile or substantially trochoid tooth profile starts a compression stroke in the location of a partition section between an intake port and a discharge portion, and a linking gap L is composed by the interdental space and a preceding adjacent interdental space realized in a discharge stroke. The linking gap expands gradually from the start of compression stroke to the discharge stroke.

Abstract: An internal combustion rotary engine is described, adapted to be used both for motor vehicles and ground machines (alternators, compressors, pumps and the like) or water craft or any type. The used fuels are the same of the presently used reciprocating engines. This engine comprises two rotors one inside the other, rotating in the same direction and at the same number of revolutions on two non concentric axes. The eccentricity between the two axes creates a crescent like chamber divided into four parts by four mobile elements mounted on the internal rotor, said elements being in turn constituted by two bodies that fit continuously to the inner surface of the external rotor thus ensuring the tight seal between the chambers. The efficiency of this motor is more than double of a reciprocating engine of the same displacement, with consequent halving of consumptions and emissions of carbon monoxide and dioxide.

Abstract: An internal gear pump which has a crescent disposed between an outer rotor and an inner rotor having a trochoidal tooth profile, and which reduces vibrations caused by pulsations generated when the fluid is discharged. The internal gear pump has an outer rotor having internal teeth formed therein, an inner rotor disposed on the inner peripheral side of the outer rotor and having formed therein external teeth that mesh with the internal teeth, and a crescent disposed in a clearance between the outer rotor and the inner rotor. Pitch spacings of the external teeth of the inner rotor are formed as non-equal spacings, and pitch spacings of the internal teeth of the outer rotor correspond to the pitch spacings of the external teeth of the inner rotor.

Abstract: A pump assembly including a gerotor pump having an inlet and an outlet, and comprising an annulus and a lobed rotor, one, but not both, of the rotor or annulus being split axially into two parts, the pump further comprising indexing means for angularly shifting one part relative to the other part, the indexing means comprising a chamber having a first indexing port and a second indexing port, and a partition which divides the chamber into a first portion including the first indexing port and a second portion including the second indexing port, wherein the partition comprises a part which is pivotally mounted within the chamber for angular movement within the chamber.

Abstract: In an oil pump employing a cam ring, and inner and outer rotors in meshed-engagement, two housings are provided at opposite ends of the cam ring. A plurality of volume chambers are defined between inner and outer teeth of the rotors. Two axial holes are formed in the cam ring. A first one of the axial holes is positioned corresponding to a mesh portion having a minimum volume, whereas the second axial hole is positioned corresponding to a trap portion having a maximum volume. A suction port and a discharge port are formed at least in one of the housings and are open to the volume chambers between the mesh and trap portions. All are positioned at a line symmetry of an axis line between the mesh and trap portions. At least one of the two axial holes is formed as a slot extending along the axis lines.

Abstract: In a pump plate (26) of a feed pump, an inlet port (26b) and an outlet port (26c) are formed around a shaft hole (26a) through which a driving shaft is inserted, and a rib (26f), which partitions each of the inlet port (26b) and the outlet port (26c) in the circumferential direction thereof and connects opposite sides (an inner peripheral side and an outer peripheral side) of each of the inlet port (26b) and the outlet port (26c), is provided. Namely, each of the inlet port (26b) and the outlet port (26c) is divided into two portions in the circumferential direction thereof, by the rib (26f). Therefore, when the feed pump is fastened to a side face of a pump housing by bolts, even if the thickness of the pump plate (26) is not increased, the deformation of the center of the pump plate (26) can be prevented.

Abstract: A tandem type trochoid pump is comprised of a drive shaft having a non-circular end portion, a spacer positioned between a first trochoid pump and a second trochoid pump in a housing body, a first fixing portion for fixing a first inner rotor of the first trochoid pump to the drive shaft in a rotational direction, and a second fixing portion for fixing a second inner rotor of the second trochoid pump to the drive shaft in the rotational direction.

Abstract: Improved gerotor pumps comprising laterally constrained floating rings, thereby providing an orthogonal degree-of-freedom and allowing gerotor sets positioned therein to establish their own preferred mesh orientation, and additionally wherein the outer rotor of the gerotor set is forcibly positioned against the inner rotor of the gerotor set at the gerotor set's in-mesh position whereat there is little relative motion between the inner and outer rotors, thereby resulting in a substantially friction- and wear-free meshing action of the gerotor set.

Abstract: A bearing is located with movement of an outer race in the longitudinal direction of a drive shaft being restricted, and the drive shaft is fixed to an inner race 51c with the press fit, so that, it is possible to prevent the drive shaft from escaping. In addition, the inner race is longer than the outer race. Therefore, it is possible to obtain sufficient strength of the press fit of the drive shaft in the inner race 51c while suppressing the size of the outer race (in other words, suppressing the size of the pump device). As a consequence, the size of the pump device can be suppressed while increasing reliability of the function for preventing the drive shaft from escaping.

Abstract: Rotational pump with variable volume flow, comprising a pump housing having a suction connection and a pressure connection, an outer rotor with inner toothing which is rotatably disposed inside the housing, and an inner rotor with outer toothing which is eccentrically disposed in the outer rotor, and which can be driven by a drive shaft which is disposed in the pump housing parallel to the axis of the outer rotor, wherein a rotatable adjusting ring is provided coaxially to the drive shaft to change the volume flow in the pump housing, and in which the outer rotor is eccentrically and rotatably disposed, characterized in that a slider, which can change the size of at least one of the connections, is disposed, as viewed in the turning direction, between the pressure connection and the suction connection.

Abstract: A gerotor mechanism is used to guide the rotation of a turntable having a Reuleaux triangle shape. In one version, the mechanism includes a gerotor having three lobes, and the gerotor guide has a guide profile including four recesses for receiving the lobes of the gerotor. Rotation is governed by a 4:3 hypocycloid function. The profiles of the gerotor and the gerotor guide are expanded uniformly from an original hypocycloid pattern so that rotation of the turntable results in execution of the hypocycloid function while retaining the gerotor in controlled contact with the profile of the gerotor guide. A reciprocal of the hypocycloid function yields a “cloverleaf” gerotor. Substantially planar bearing surfaces may be used at the interface of (a) the turntable and the gerotor guide, (b) the gerotor and the gerotor guide, or (c) the gerotor and the underlying support surface. The gerotor guide and turntable may be part of a cabinet or built into a kitchen countertop.

Abstract: A gerotor mechanism is used to guide the rotation of a turntable having a Reuleaux triangle shape. The mechanism includes a gerotor having three lobes; the gerotor guide has a guide profile including four recesses for receiving the lobes of the gerotor. Rotation is governed by a 4:3 hypocycloid function. The profiles of the gerotor and the gerotor guide are expanded uniformly from an original hypocycloid pattern so that rotation of the turntable results in execution of the hypocycloid function while retaining the gerotor in controlled contact with the profile of the gerotor guide. Substantially planar bearing surfaces may be used at the interface of (a) the turntable and the gerotor guide, (b) the gerotor and the gerotor guide, or (c) the gerotor and the underlying support surface. The gerotor guide may be part of a cabinet or built into a kitchen countertop.

Abstract: A rotary engine is provided that comprises a compression cylinder and combustion cylinder divided by a separation wall. Air or a fuel/air mixture is drawn into the compression cylinder, compressed, and then transferred to the combustion cylinder. The compressed air or air/fuel mixture is ignited in the combustion cylinder, creating an expansion of the combustion gases which drives the system. The compression and combustion cylinders have epicycloidal-shaped chambers that each house a single vane. The vanes pass through the crankshaft and adjust to remain in contact with the chamber walls as the crankshaft rotates. The compression ratio of the present invention can be maximized by adjusting the thicknesses of the compression and combustion cylinders as well as by offsetting the positions of the compression and combustion vanes with respect to one another.

Abstract: An internal gear oil pump rotor assembly which enables the construction of an oil pump that is compact and has high performance. In the oil pump rotor assembly having an inner rotor and an outer rotor, the number of teeth “Zi” of the inner rotor with trochoid tooth profiles is set to be equal to or fewer than “6”, and a ratio Si/So is set so as to satisfy the following inequalities: 0.8?Si/So?1.3, where Si is a cross-sectional area of one external tooth which is formed outside a root circle that is formed along the bottoms of the external teeth of the inner rotor, and So is a cross-sectional area of one internal tooth which is formed inside a root circle that is formed along the bottoms of the internal teeth of the outer rotor.

Abstract: A displacement-type ring gear machine includes a casing including a gear chamber comprising a supply port and a discharge port, an internal gear accommodated in the gear chamber and comprising an external toothing, and an external gear eccentric to the internal gear and comprising an internal toothing meshing with the external toothing so as to form expanding and contracting fluid cells which direct the working fluid from the supply port to the discharge port. The meshing toothings comprise a radial clearance and a tangential clearance which is smaller than the radial clearance. The tips or roots of at least one of the two toothings comprise a profile derived from a cycloid.

Abstract: An internal gear set comprising an inner rotor having a number of radially projecting cylindrical tooth members engaging a conjugate internally toothed outer rotor. The latter has one more tooth than there are tooth members on the inner rotor and is mounted eccentrically to the inner rotor so that the rotors move conjugately relative to one other.

Abstract: A noise-reduced internal gear pump incorporating an inner rotor having an addendum formed by a smooth curve and a dedendum formed by a hypocycloid. The tooth profile of the outer rotor is determined by the following steps. The center Oi of an inner rotor 1 is revolved around the center Oo of the outer rotor so as to form a circle S having a diameter of 2e+t, where “e” is the amount of eccentricity between the inner and outer rotors and “t” is the maximum value of the interrotor clearance between the outer rotor and the inner rotor pressed against it. The inner rotor 1 is rotated on its axis 1/n times while its center Oi makes one revolution in the circular orbit S, where “n” is the number of teeth of the inner rotor. The envelope of the group of the tooth profile-curves of the inner rotor formed by its revolution is used as the tooth profile of the outer rotor.

Abstract: An oil film is formed between side faces of a pump gear and side faces of a pump casing to thereby reduce wear and reduce sliding resistance. To form the oil film predetermined numbers of recesses are provided in both side faces of a drive gear and in both side faces of a driven gear of the gear pump. The recesses serve to hold oil. The oil held in the recesses oozes out to between the opposing and contacting side faces to thereby form the oil films therebetween.

Abstract: A bottom portion of an intake port is provided with a sloped bottom surface formed of a plane such that sloped bottom surface approaches the side surfaces of external teeth and internal teeth from an upstream side to a downstream side in rotational direction of two rotors. Fluid that flows in the intake port is regulated by the sloped bottom surface and smoothly guided into individual inter-teeth chambers that are expanding. Since the sloped bottom surface on the bottom portion of the intake port is formed of a plane without spiral or twisting, design and manufacturing of a gear pump is extremely easy.

Abstract: A method of thermal cycle applied to a combustion engine utilizing a first, second, and third stroke. The first stroke is an intake stroke where intake products are introduced into the combustion engine and are not compressed. The second stroke is a power stroke where the uncompressed intake products are ignited to produce combustive products. The third stroke is an exhaust stroke where the combustive products are exhausted from the combustion engine.

Abstract: A rotary machine having a housing with rotary components disclosed within. The rotary machine is configurable as an internal combustion rotary engine, an external combustion rotary engine, a gas compressor, a vacuum pump, a liquid pump, a drive turbine, or a drive turbine for expandable gases or pressurized liquids. The combustion engine employs a new thermal cycle—eliminating the Otto cycle's internal compression of the combustion products as part of the cycle. The new combustion thermal cycle is intake, expansion and exhaust.

Abstract: A rotary machine configured to product rotary power by igniting intake products that are not compressed to produce combustive products, directing the pressure produced by combustive products to a rotatable expansion ring that rotates a distance proportional to the pressure and exhausting the combustive products from the rotary machine.

Abstract: At a boundary area between a high-pressure portion in which a discharge port of a fuel pump is disposed and a low-pressure portion in which an intake port is disposed, a pressure relief groove extending along the boundary area is formed so as to be communicated with the outside of the pump by pressure relief hole. Alternatively, a slit is formed communicated with the outside. Accordingly, a fuel at a high-pressure area portion can be drained with reliability. Further, by communicating the above pressure relief groove with a positioning pin insertion port, a single hole can serve both as a positioning pin insertion hole and a pressure relief hole.

Abstract: The invention relates to an internal geared wheel pump without a filler piece, comprising a housing, an internal geared wheel (3) which rotates in the housing and an external geared pinion (2) which is rotationally mounted in the housing and which meshes with the geared wheel. The teeth of the pinion define a suction area and a pressure area in the gearing, by complete engagement with the tooth spaces fo the geared wheel and by sealing contact with tooth crows of the geared wheel in an engagement-free geared wheel area which lies approximately diametrically opposite the tooth space engagement. The toothing of the geared wheel and the pinion is an involute or cycloid toothing, the tooth crowns having a rounded peripheral surface (23, 34).

Abstract: An oil pump rotor assembly for an oil pump which enables reduction of noise while preventing pump performance and mechanical efficiency from being degraded. In this oil pump rotor assembly, the tooth tip profile of each of at least one of external teeth of an inner rotor and internal teeth of an outer rotor the inner rotor is formed such that a base cycloid curve is divided at a midpoint thereof to obtain two tooth curve segments, and the two tooth curve segments are separated by a predetermined distance along the circumference of a base circle or in the direction of a tangent of the base cycloid curve drawn at the midpoint thereof and are smoothly connected to each other using a curve or a straight line.

Abstract: An internal gear oil pump rotor assembly which enables the construction of an oil pump that is compact and has high performance. In the oil pump rotor assembly having an inner rotor and an outer rotor, the number of teeth “Zi” of the inner rotor with trochoid tooth profiles is set to be equal to or fewer than “6”, and a ratio Si/So is set so as to satisfy the following inequalities: 0.8≦Si/So≦1.3, where Si is a cross-sectional area of one external tooth which is formed outside a root circle that is formed along the bottoms of the external teeth of the inner rotor, and So is a cross-sectional area of one internal tooth which is formed inside a root circle that is formed along the bottoms of the internal teeth of the outer rotor.

Abstract: A rotary machine having a housing with rotary components disclosed within. The rotary machine is configurable as an internal combustion rotary engine, an external combustion rotary engine, a gas compressor, a vacuum pump, a liquid pump, a drive turbine, or a drive turbine for expandable gases or pressurized liquids. The combustion engine employs a new thermal cycle—eliminating the Otto cycle's internal compression of the combustion products as part of the cycle. The new combustion thermal cycle is intake, expansion and exhaust.