Abstract: The invention relates to an internal gear machine for reversed operation in a closed circuit comprising an outer-toothed pinion, an inner-toothed ring gear meshing with the pinion; a housing; a filing that fills the sickle-shaped space between the pinion and the ring gear; the filling comprises two identical filler pieces; a stop pin is provided that is mounted in the housing and against which the filler pieces are supported by their front faces; the housing has two pressure lines and a drain outlet; the filler pieces are symmetrically disposed relative to a plane (symmetrical plane) extending through the center points of the pinion and the ring gear; the two pressure lines are located on both sides of the symmetrical plane viewed in axial direction.

Abstract: A variable displacement hydraulic gear pump has a housing having fluid inlet and fluid outlet ports; and first and second gears rotatable in the housing. The first gear and the second gear are positioned in gear tooth engagement for at least a portion of the axial length of each. At least one of the first gear and the second gear is axially moveable, to vary the axial length of gear tooth engagement.

Abstract: A hydraulic device includes a housing enclosing a hydraulic motor having a wobble shaft driven by a rotor of a gerotor gear set. An outer end of the wobble shaft is connected to the inner end portion of an output shaft. The output shaft extends axially through the housing and outward from the end of the housing opposite from the motor. A brake assembly holds the motor output shaft against rotation when the hydraulic motor is not operated. The brake assembly includes a series of compression springs provided toward the motor end of the housing, brake disks provided toward the end of the housing opposite from the motor, and an annular piston disposed axially between the springs and the brake disks. The piston and housing include corresponding radial stop surfaces that engage across a major portion of the stop surfaces to prevent over-compression of the springs and the piston from cocking when the piston engages the housing.

Abstract: A gearing, particularly for use in a gear pump which can be utilized in the power train of a motor vehicle, has a housing, a rotary internal gear in the housing, and a spur gear driven by a prime mover, mating with the internal gear and defining with the latter a crescent-shaped chamber for forcible conveying of a fluid, such as lubricant, from an inlet communicating with one end portion to an outlet communicating with the other end portion of the chamber. In order to avoid turbulent flow of fluid in the chamber, the latter is substantially filled by a composite insert. Such insert can comprise several crescent-shaped fillers with at least one seal between them, or two one-piece or composite fillers which are disposed end-to-end as seen in the circumferential direction of the internal gear and are separated from each other by an abutment which is secured to or of one piece with the housing.

Abstract: An improved internal gear pump design is provided whereby the head plate includes a groove located vertically above the crescent for providing improved axial feed to the roots or innermost spaces between the idler teeth. The design of the pump also includes a stepped shaft design whereby the radius of the shaft immediately adjacent to the rotor is greater than an adjacent outboard section of the shaft. As a result, a chamber for housing the seal assembly is defined as the space between the stepped shaft portion, the annular seal plate, the outboard section of the shaft that has a lesser or reduced diameter, and the casing. The casing may also include a recess for providing sufficient space for the seal assembly. The larger section of the shaft is accommodated in a bushing mounted to the inside surface of the casing. The inside diameter of the bushing is large enough to accommodate the larger stepped portion of the shaft as well as the outside diameter of the seal assembly.

Abstract: A hydraulic positive displacement machine has rotating conveying elements whose end faces are sealed by pressure plate. This pressure plate is loaded by a control valve with hydraulic pressure in order to adjust the size of the sealing gap. The control valve has a hollow piston in which a metering orifice is located. A return connector, a connector communicating with a consumer, and a hydraulic control connector connected to the pressure plate can be controlled by the hollow piston with its metering orifice.

Abstract: There is disclosed a hydraulic or pneumatic machine having a first displacement element (8) that is rotatable about an axis of rotation connected to a shaft (10) so as to rotate therewith, which shaft is mounted rotatably in a housing (2), and co-operates with a second displacement element (9). The structure of such a machine is to be improved. For that purpose, the housing (2) has a pocket (3) in which the displacement elements (8, 9) are so arranged that the housing (2) covers the displacement elements (8, 9) axially on both sides (4, 5) at least in a working region and in the circumferential direction over a maximum of 180°.

Abstract: The invention is embodied in a hydraulic gear machine, such as for example a pump or motor, with at least one multistage pressure building slot in an axial plate of the housing. The slot is designed to facilitate a gradual rise of fluid pressure between the mating teeth of the gears and to reduce the noise being generated by the machine as a result of advancement of fluid from a suction inlet to an outlet for pressurized fluid.

Abstract: A hydraulic gear machine, particularly an internal-gear pump in a vehicular transmission, with an internal gear and an external gear, has a central bearing tube that rotatably supports the external gear and receives the input or output shaft of the transmission. The transmission shaft is rotatably supported in the bearing tube by means of a bearing that is radially interposed between the transmission shaft and the bearing tube.

Abstract: An improved internal gear pump design is provided whereby the head plate includes a groove located vertically above the crescent for providing improved axial feed to the roots or innermost spaces between the idler teeth. The design of the pump also includes a stepped shaft design whereby the radius of the shaft immediately adjacent to the rotor is greater than an adjacent outboard section of the shaft. As a result, a chamber for housing the seal assembly is defined as the space between the stepped shaft portion, the annular seal plate, the outboard section of the shaft that has a lesser or reduced diameter, and the casing. The casing may also include a recess for providing sufficient space for the seal assembly. The larger section of the shaft is accommodated in a bushing mounted to the inside surface of the casing. The inside diameter of the bushing is large enough to accommodate the larger stepped portion of the shaft as well as the outside diameter of the seal assembly.

Abstract: A crescent pump including a housing having an inlet port and a discharge port, a driving gear, and a driven gear meshing with driving gear in a gap between the inlet and the discharge ports. External and internal troughs on the driving and the driven gears define pump chambers. A stationary crescent-body has a pair of arc-shaped walls which cooperate with the tips of the external and the internal gear teeth thereon in defining fluid seals. The edges of an inlet ramp at an upstream end of the crescent body and the edges of a discharge ramp at a downstream end of the crescent body define inner and outer upstream and downstream metering orifices which close and open in complementary fashion to maintain constant the rate of fluid leakage from the discharge port toward the inlet port. A pair of shaped metering grooves in the pump housing cooperate in defining a flow path between the discharge port and the inlet port through a succession of trapped volumes between the driving and the driven gears.

Abstract: An internal-gear machine comprises a casing with an internally toothed annular gear rotatable therein, an externally toothed pinion engaged with the annular gear and a filling member between the annular gear and the pinion. The filling member is subdivided into two portions by a substantially circumferentially extending separating surface. The filling member portions have respectively mutually oppositely disposed recesses which extend from the separating surface and which each have an inclined surface parallel to the axis of the machine. The inclined surfaces are in a wedge-shaped relationship with each other and a sealing roller is arranged in the wedge-shaped space. The sealing roller is pressed against the inclined surfaces by a hairpin spring operatively disposed between the sealing surface and a support surface. The spring limbs bear against the sealing roller and the support surface while the bent end of the spring projects into a free space in the casing.

Abstract: An improved gear pump having members with different hardnesses includes a housing defining an internal bore with inlet and outlet passageways. A head member includes a wall between the inlet and outlet passageways and extends toward a toothed rotor. A toothed idler gear meshes with the rotor. The head member and idler gear are made of materials having a hardness greater than that of the rotor material. In one embodiment the idler gear is made of ceramic material whereas the head member and rotor are made of cast iron, with the head member treated to have a hardness greater than that of the rotor.

Abstract: The invention relates to an internal toothed belt pump, in particular an internal toothed belt pump which is self-priming and can deliver and meter also non-lubricant fluids at a controlled pump speed and medium pressure.

Abstract: A pump has inner and outer gears, suction and discharge passages, and a reinforcing member arranged in at least one of openings of the suction and discharge passages, the reinforcing member reinforcing a wall between the at least one opening and an inner peripheral surface of a gear pocket formed in a housing.

Abstract: A gear train mechanism includes a housing having side walls that are made of a material exhibiting a modulus of elasticity of at least 140 GPa. A pair of shafts is supported by slide bearings in the housing and exhibit a length of at least of 1.3 times the diameter of the shafts. A first gear of external-tooth type is mounted on one shaft and is defined by an addendum diameter, a top land width and a circular pitch, with the top land width being at least 15% of the circular pitch. A second gear is mounted on the other shaft and is in mesh with the first gear, with both gears disposed between the side walls, wherein the side walls have a wall thickness of at least 75% of the addendum diameter.

Abstract: Described is an internal-gear machine (10) comprising a casing (12, 80) in which there are provided an internally toothed annular gear (20), an externally toothed pinion (24) in engagement therewith, and a filling portion (28) which is divided into two in the space (14) between the annular gear (20) and the pinion (24). The filling portion parts (32, 34) are provided with openings (56, 58) which start from the common separation surface (30) and which are each provided with an inclined surface (60, 62) that is parallel to the axis, in such a way that the two inclined surfaces (60, 62) which face towards each other form with each other wedge surfaces which include a wedge angle. Bearing against the wedge surfaces is a respectively associated sealing roller (64) which is pressed against the associated wedge surfaces by means of a spring element (88).

Abstract: The invention relates to a gear pump with two delivery gears meshing with one another, said gears cooperating in the rotation direction in front of or behind a plane containing the gear axes with a pressure and/or suction line. According to the invention, excess delivered pumping medium is introduced through a separate line behind the connection of the suction line in the circumferential direction of the gears, into the tooth spaces of the delivery gears in order to prevent any cavitation that might occur.

Abstract: A fluid apparatus of an internal gear type comprising an internal gear 3 rotatively mounted in a housing 1, an external gear 5 meshing with said internal gear 3, and a crescent partition piece disposed between the both gears, each tooth profile of said both gears 3 and 5 being defined by a line equidistant from an inner cycloid described by a rolling circle, the diameter of which is equal to a radius of the intermeshing pitch circle of the internal gear, whereby the load applied to the tooth surfaces between the meshing internal gear and external gear and thus the tooth-contact stress can be reduced, and wear of tooth surfaces and generating noise can also be minimized.

Abstract: Internal gear pump with an internal gear, a thrust plate arranged on each side of the internal gear, a powered external pinion arranged eccentrically relative to the internal gear and meshing with it, and a sickle-shaped, floating filler part split in peripheral direction and bearing with its blunt end on an axial support pin. The first segment of the filler part that faces the teeth of the pinion has a greater radial thickness than its second segment facing the teeth of the internal gear. The first segment features in the parting interface at least one axially extending groove for accommodation of a sealing element. The first segment features at least one stop for restricting wear on the surface facing the teeth of the pinion.

Abstract: In an internal gear pump, which can also be constructed as pump with suction control, to reduce the undesired cavitation effects in the pressure region and to permit the oil to flow off from the diminishing displacement cells between the teeth of the gears, and impedance-controlled overflow passage is provided, the openings of which towards the moving displacement cells are alternately opened and closed by the teeth of at least one of the gears.

Abstract: A crescent internal gear pump achieves greatly improved sealing against cter flow of fluid and greatly reduced noise by increase of the number of teeth of each of the ring and pinion gears which form discrete volumes of pumped fluid against a crescent-shaped member or insert. Reduction of the size of the teeth on the ring and pinion gears allows an increase in the angular extent of the crescent-shaped insert in order to increase the number of discrete volumes to be increased to a minimum of nineteen for each of the ring and pinion gears. The reduction in noise is accompanied by an increase in the fundamental frequency of the remaining noise, which can be more readily attenuated by acoustic filtering and isolation. Perfecting features of the invention include shaping of the crescent-shaped member to equalize the number of discrete volumes formed by each of the ring and pinion gears and shaping the teeth of the pinion gear to equalize the volumes of the discrete volumes formed by each gear.

Abstract: A hydraulic pump in the form of an oil pump for a vehicle engine has both its pinion, which is driven by the engine's crankshaft, and a ring-gear, which cooperates with the pinion, incorporated in an end-cover fastened to the end of the engine block. A cap is inserted in a collar on the side of the end-cover facing away from the engine and is only held in position there by means of a locking ring, which engages with a groove in the collar and presses the cap toward the engine. Outside the oil pump, a partly socket-shaped belt pulley is mounted on the crankshaft and its socket-shaped portion substantially grips the collar. Fitting and removal are thus simplified and engine overall length reduced. Simplified sealing also reduces oil leakage risks.

Abstract: An externally driven rotor is rotatable within a pumping chamber and is located in meshing relationship with an internal idler gear. An annular bearing mounted within the housing in confronting relationship with a peripheral surface of the rotor, provides a bearing surface and supports radially directed loads exerted by unbalanced fluid force on the rotor. A pressure balancing circuit is provided for transferring pressurized fluid from a discharge region in the pump to a backside of the rotor to at least partially balance axial forces exerted on the rotor by pressurized fluid. To provide bi-rotational capability, a cross-communicating passage and check valves are used for controlling the flow of fluid into the pressure balancing circuit.

Abstract: Filler piece (8) of a gear pump or a gearmotor, mounted in an interspace (4), formed from an internal gear (2) and a pinion (3), exhibits a sickle-shaped seal (7), with which laterally projecting pivot pins (6) are connected, and filler piece (8) is designed in one-piece and/or in two parts by a separating gap (14) extending from high-pressure area (13) into low-pressure space (11).

Abstract: A crescent pump gear including: a housing having a chamber communicating with an intake port and a discharge port; a shaft journaled for rotation within said chamber; an externally toothed inner gear mounted centrally on said shaft about a first axis; an internally toothed annular gear eccentrically mounted for rotational engagement with said inner gear about a second axis; a crescent contacting a portion of said inner gear has a dual cycloidal tooth profile generated about a first generating circle and said outer gear has a dual cycloidal tooth profile generated about a second generating circle.

Abstract: An internal gear pump includes a casing, a cover mounted to the casing, a pump chamber defined between the casing and the cover, an internal gear slidably arranged within the pump chamber, an external gear rotatably arranged within the pump chamber and rotatingly driven from the outside to engage with and drive the internal gear, a fixed filler for regulating sliding movements of the internal and external gears and for preventing oil leakage from a high-pressure side to a lower-pressure side within the pump chamber, a suction port formed in the cover and extended circumferentially within the angular range of about 90 degrees, an oil pocket device formed in respective sliding surfaces of the casing and cover, on which the opposite side surfaces of the internal gear slide, the oil pocket device having a plurality of taper lands extended within the radial width of from the root of tooth of the internal gear to the outer peripheral surface of the internal gear between the peripheral wall of the pump chamber and t

Abstract: This invention aims at providing a portable type of automobile engine oil suction pump which features a simple construction and a luminous indication lamp to warn its users of the exhaustion of the engine oil. This invention provides the improved structure of a portable type of automobile engine oil suction pump. Its main features are: an inner gear set comprising an inner ring gear and a pinion gear in the interior of two circular disks; and, an eccentric, convex, crescent-shaped block having an inner concave edge in touch with the pinion, and located eccentric to the ring gear with its convex side jointly set with the pinion to form an outer peripheral shape so as to enable one side of the inner ring gear to be engaged by the pinion, and the other side to keep in touch with the convex face of the eccentric crescent block, so as to allow the inner pinion to directly join with the revolving shaft of the motor to cause the ring gear to rotate.

Abstract: A gear pump which includes a housing having an internally toothed gear and a pinion meshing with the internally toothed gear disposed therein. The housing has a sickle-shaped space between the two gears and has therein a filler piece. In order to avoid a fluttering of the filler piece and the noises connected therewith, structure is provided for urging the filler piece, due to pressurized oil being guided from the pressure chamber and one side of the filler piece into a bore extending through the filler piece to the opposite side of the filler piece, against the pump housing. The filler piece can also be locked in the direction of rotation by a pressure piece also loaded by the pressurized oil.

Abstract: A hydraulic device has an inner rotor of cylindrical section mounted eccentrically within an outer rotor of tubular section. Angularly spaced axially extending ribs of part-circular cross-section are provided on the inner rotor and correspondingly spaced axial recesses of part-circular cross-section are provided on the opposed surface of the outer rotor, the ribs meshing with the recesses over an arcuate working zone in which a plurality of adjacent ribs engage corresponding recesses, the ribs moving relative to but in engagement with the recesses as they progress through the working zone. A baffle is located between the rotors to provide a seal therebetween outside the working zone and an inlet port is provided to the working zone adjacent the termination thereof relative to the direction of rotation of the rotors while an outlet port is provided adjacent the center of the working zone, the inlet and outlet ports being separated by at least the pitch of the ribs on the rotor.

Abstract: An oil pump has a split frame with the pump mechanism situated in a chamber in one of the frames or between the split frames. An inlet conduit extends from an inlet port to the low pressure side of the pump and an outlet conduit extends from the high pressure side of the pump to an outlet port. An excess pressure relief path is provided to permit fluid flow from the outlet conduit to the inlet conduit when the outlet conduit pressure exceeds the inlet conduit pressure by a predetermined difference. This is accomplished by providing a bypass channel formed in one frame and fluidly intersecting the outlet conduit, and a valve cavity formed in the other frame and fluidly intersecting the bypass channel and the inlet conduit. Valve means are situated in the valve cavity for isolating the bypass channel from the inlet conduit during normal pressure differences between the inlet and outlet conduits.

Abstract: An oil pump of an automatic transmission, which comprises a casing having an oil pump gear chamber formed therein, the casing having first and second bores exposed to the oil pump gear chamber, the first and second bores being coaxially spaced from each other with an interposal of the oil pump gear chamber therebetween; gears operatively disposed in the oil pump gear chamber of the casing; a first splined portion formed on a leading end portion of a stator shaft of a torque converter; and a second splined portion formed on an inner surface of the second bore, wherein the stator shaft is thrusted through the first and second bores in this order into a fixed position wherein the first and second splined portions are operatively engaged.

Abstract: A rotating type intake and discharge apparatus comprises an annular rotary cylinder which is provided with a plurality of cylinder slits formed at its inner circumferential portion in the radial direction and is disposed in a housing so as to be rotatable on a first imaginary cycle, a rotary piston rotatably supported in and by the housing, which comprises piston rollers in the number one-half of that of the cylinder slits, which are arranged on a second imaginary circle having a diameter one-half as large as the first imaginary circle and in internally contact with the same and a center roller disposed near the piston rollers, the piston rollers being capable of revolving on the second imaginary circle; a flow path wall formed by a part of the housing so as to have a side plane which has the same common center as the first imaginary circle and extends along the inner side of the locus of rotation of the rotary cylinder, and a side plane which has the same common center as the second imaginary circle and exte

Abstract: A gear pump in which a drive shaft is telescoped into a bore in a spur gear and is held against rotation relative to the gear by means of a key fitting into keyways formed in the shaft and in the bore of the gear. To retain the shaft against axial movement relative to the gear, a spring steel ring is formed with a radially extending slot having a transverse width just slightly greater than the transverse width of the key. The ring is collapsed hoopwise into a groove in the shaft and is positioned such that the slot in the ring is alined axially with the keyway in the shaft. When the shaft is telescoped to a predetermined depth in the bore in the gear, the ring expands hoopwise and snaps into a groove formed in the wall of the bore. The coaction of the ring with the two grooves locks the shaft against axial movement relative to the gear.

Abstract: An internal-gear machine such as a pump comprises a casing with an internally toothed annular gear mounted therein. An externally toothed pinion meshes with the internal teeth of the annular gear over a portion thereof, and an arcuate filling member is disposed between the annular gear and the pinion. The filling member has a first end of substantial thickness in the radial direction of the assembly and tapers almost to a point at the second end, and is mounted in the casing by means of at least one mounting pin. The pin is arranged at a spacing from the first end of the filling member, which is towards the intake chamber defined between the annular gear and the pinion, and the pin has a mounting portion engaging into a groove in a side surface of the filling member. The filling member is thus rotatable about the axis of the pin and displaceable by virtue of displacement of the mounting portion in the groove in the filling member.

Abstract: A pump housing is formed with a recess receiving therein pump elements, and a pump cover is secured to the pump housing to close the recess. The pump cover and the pump housing define an interface area therebetween formed with a pump discharge port. The pump casing is provided with a predetermined passage which normally serves as an oil pressure delivering passage, but serving as a drain passage under a condition when the oil pump discharge pressure increases. The predetermined passage is open within said interface area via a groove extending around the pump discharge port.

Abstract: An oil pump cover includes an annular rib receiving therein an oil pump housing and a flange section extending radially outward of the annular rib. The flange section is formed with a cutout to receive a final drive pinion on a counter shaft of an automatic transaxle. Thus, the final drive pinion is disposed in the vicinity of the annular rib.

Abstract: An internal-gear machine such as pump comprises a casing with an internally toothed annular gear rotatably mounted therein. An externally toothed pinion meshes with the internal teeth of the annular gear, and a generally sickle-shaped filling member which is split approximately in a circumferential direction is disposed in the clearance between the pinion and the annular gear. The end faces of the filling member portions which are towards the intake side of the machine may be of a convexly curved configuration and bear against a support element fixedly connected only to one wall of the casing so as to be radially slidable thereagainst and also pivotable about a pivot axis parallel to the axis of the pinion. Alternatively the end faces of the filling member portions may be flat and bear radially slidably against an intermediate element pivotally supported on an at least part-cylindrical peg fixed to only one wall of the casing.

Abstract: A gear pump or motor comprises a pair of gears intermeshing with each other, a case body accommodating the pair of gears, and a hard layer formed on an inner surface of the case body. The hard layer is made of a material to be as hard as not to be cut by tooth tips of the pair of gears. The hard layer may be a ceramic coating or a composite coating layer which performs a grinding like operation on the tooth tips.

Abstract: An internal-gear pump with a partition plate, comprising: an arcuate chamfer formed at an inner edge of an end face of the partition plate rotationally opposing an inner gear of the pump and having a curvature at least greater than that of tooth tip edges of the inner gear.

Abstract: A rotary fluid pressure device is disclosed of the type including housing means defining a fluid inlet (57) and a fluid outlet (61) and including some form of rotary fluid energy-translating displacement mechanism associated with the housing. In one embodiment of the invention, the displacement mechanism comprises a gerotor gear set (17) including a housing member (22), an internally-toothed ring (23), and an externally-toothed star (27). Included is a free-wheeling mechanism (71) having an engagement member (73) and an actuation means (81) operable to move the engagement member between first and second positions. In a first position, the engagement member (73) prevents rotational movement of the ring (23) and the star (27) has its normal and orbital rotational movement to define expanding (28) and contracting (29) fluid volume chambers.

Abstract: A lubricating oil pump for a four-stroke internal combustion engine inclu a pump body; an annular gearwheel rotatably mounted around the outer perihery of the pump body, the annular gearwheel including projections on its outer surface to function as cams for valve control and including teeth on its inner surface; and a driving pinion mounted within the annular gearwheel and attachable to the crankshaft of the engine, the driving pinion including external teeth in meshing engagement with the internal teeth of the annular gearwheel such that the annular gearwheel rotates at half the speed of the driving pinion.

Abstract: The oil pump of an internal combustion engine having an engine unit support elastically suspended in a crankcase, is arranged in a front wall of the crankcase and actuated by a flexible shaft driven by the crankshaft of the engine. Thereby, a vibrational decoupling between the engine unit support and the crankcase is ensured and a ducting of the pressurized oil out of the crankcase is simplified.

Abstract: A liquid pump has a drive shaft which extends through a housing. The high pressure side of the pump is connected through a radial channel with an annular channel formed in the housing surrounding the drive shaft. High pressure liquid in the annular channel prevents the ingesting of air by the pump.

Abstract: An internal gear pump motor having a housing, a pinion and an internal gear rotatably supported in the housing and meshing with each other, and filler piece means located in a space defined between the pinion and internal gear for dividing the space into two regions providing a low pressure region and a high pressure region during operation. The filler piece means includes at least one filler piece floatingly mounted within the space and having portions capable of coming into sliding engagement with tooth crests of the pinion and internal gear respectively in a portion of the space where the distance between the tooth crests of the pinion and internal gear is reduced toward the low pressure region. A stopper pin is secured to the housing operative to engage one end of the filler piece on the side of the low pressure region for restricting the circumferential movement of the filler piece toward the low pressure region.

Abstract: The pump drive shaft may rotate in either direction. The pump discharges liquid from the same port, regardless of the direction of rotation. A receiving port on the pump mounting pad is aligned with that discharge port. The pump includes a base plate, a pump plate and a cover plate, aligned with a stack. The pump has a single inlet diametrically opposite the point where the gears mesh. This inlet acts in either direction of rotation so that no valves are needed in the inlet passage. Two outlet ports are located respectively on opposite sides of the mesh point. All fluid passages and a valve means which selects one outlet port or the other, depending on the direction of rotation, are located in the base plate. All valves are simple structures trapped in chambers between the base plate and the pump plate, or between the base plate and the mounting pad. The inlet is made narrower than the teeth on the gears to prevent cavitation.

Abstract: In a hydrostatic gear machine of the type having an internally toothed outer gear and an externally toothed inner gear wherein the gears have different numbers of teeth, the gears being meshed with the outer gear surrounding gear, particularly advantageous relationships between the numbers of teeth and the shapes of the tooth flanks are provided to permit economic manufacture of the machine for use as a motor or pump.

Abstract: An internal combustion engine having a rotating crankshaft mounted on at least one main bearing is provided with an oil pump having at least one gear surround the crankshaft and rotationally driven by the crankshaft. The pump gear surrounds the main bearing so that the main bearing and the oil pump occupy a common axial space on the crankshaft.

Abstract: A combined lift and metering pump includes a set of relatively rotating pump elements in the form of an outer gear and a eccentrically disposed inner gear fixed on a drive shaft. A regulator communicates through a control passage with a discharge chamber of the pump to regulate fuel pressure in the discharge chamber and a metering orifice formed through the outer gear provides for intermittent communication with a timing port once with each revolution of the outer gear for discharging a metered amount of fuel from the discharge chamber.

Abstract: A high pressure internal gear pump has an inner rotor with outer gear-type teeth inside of an outer rotor with inner gear type teeth. The outer rotor is eccentrically revolving relatively to the inner rotor, whereby the gear-teeth are meeting each other as known from the former art. A half-moon like part is provided between the inner and outer rotor as usual in such pumps. The invention provides slots for the reception of pressure in the part between the teeth or in the housing surrounding the outer rotor. The pressure in said slot or slots presses the neighboring portions against the inner- and/or outer rotor for more perfect seal at high pressure. In addition an axially adjusting thrust body may be provided to seal the ends of the rotors. The mentioned slots may have enlargements on suitable locations in order to make the adjacent sealing parts more flexible for suitable sealing engagement with the respective portions of the rotors.