Abstract: A scroll compressor assembly incorporates a separator plate which has a clearance between its outer periphery and an inner periphery of an end cap. In this way, the location of the separator plate along the center axis of the scroll can be adjusted. Further, the separator plate is placed on the center shell prior to attachment of the end cap. Thus, the separator plate need not be welded to the end cap as in the prior art. Problems such as weld splatter thus eliminated.

Abstract: An upper casing is outer-fitted to a lower casing. A concave portion for receiving a peripheral portion of a housing is provided at an inner wall of the upper casing. A convex portion for suppressing deformation of the housing caused by deformation when the upper casing is shrinkage-fitted or pressed-fitted is selectively formed at the bottom of the concave portion. A gap is provided between the lower casing and the housing for alleviating the degree of press on the housing by the casing when the upper casing and the lower casing are welded.

Abstract: A compressor which can be easily assembled and can prevent damage of seal members is presented. Its assembling method includes of (a) a step of feeding a front casing having a first inner circumference, a second inner circumference, an opening, a bottom, and a side wall, compression units having a first fitting portion and a first seal groove, and a rear cover having a second fitting portion and a second seal groove, (b) a step of installing a first seal member in the fist seal groove, (c) a step of installing s second seal member in the second seal groove, (e) a step of installing the fixed scroll on the front casing, while fitting the first fitting portion to the first inner circumference, and (f) a step of installing the rear cover to the front casing so as to cover the opening, while fitting the second fitting portion to the second inner circumference.

Abstract: A gerotor hydraulic pressure device using a powder metal wear plate to close off at least one end of a stator/rotor mechanism, with the wear plate having an axial length 0.003" greater than the cavity in the housing that contains it.

Abstract: A pump assembly comprises a hydraulic fluid pump having a housing assembled from a plurality of housing components that are pinned together rather than being clamped together by bolts. The pump is disposed in a cavity in a valve block so that the outlet fluid pressure from the pump is applied axially to the housing components to create a greater external axial force on the pump components than the internal axial force and thereby maintain the housing components in tight, sealing relation without the need for clamping bolts or other clamping means.

Abstract: A variable capacity, vane-type compressor has a cylinder block with an oval rotor chamber. A plurality of vanes mounted in slots on a rotor rotate inside the rotor chamber on a shaft that is concentric with the minor diameter of the rotor chamber. Valves discharge refrigerant gas from the rotor chamber. The front nose block is located on the front side of the cylinder block and contains a bore for the rotor shaft and a set of needle roller bearings which supports the forward end of the shaft. A circular O-ring groove with an O-ring is located on the rearward side of the front nose block at its perimeter for sealing between the front nose block and the forward side of the cylinder block. The cylinder block has internal, weight-reducing voids located outboard of the rotor chamber. The lower voids serve as an oil sump and supply high pressure lubricant to the undervane pressurization manifolds. Like the front nose block groove, the cylinder block has a circular groove machined on a rearward side.

Abstract: A pressure fluid apparatus includes first and second parts which are adapted to be secured together. A first sealing surface of the first part forms a seal with a corresponding second sealing surface of the second part. The first sealing surface includes a spigot, and the second sealing surface includes a corresponding recess adapted to receive the spigot. The inside corner where the base of the spigot meets the first sealing surface is radiussed, and the outside corner where the mouth of the recess meets the second sealing surface is correspondingly truncated, so as to accommodate the radius. On either the radiussed inside corner or the truncated outside corner, an integral projection is provided which is deformable upon assembly of the parts, to block leakage of fluid along the path defined between the two corners.

Abstract: A differential expansion control assembly is provided for a pump. The pump has a pump body with a base portion and cover portion of a first material with a first thermal expansion coefficient and a pumping mechanism of a second material with a second thermal expansion coefficient different from the first thermal expansion coefficient. The differential expansion control assembly includes at least one member disposed between the base portion and cover portion to negate a difference between the first thermal expansion coefficient and the second thermal expansion coefficient and maintain a relative controlled clearance between the cover portion and the pumping mechanism. The differential expansion control assembly also includes a seal disposed between the cover portion and base portion to allow for differential expansion of the pump body without leakage of fluid between the cover portion and base portion.

Abstract: A rotary vane pump includes a cartridge with a sleeve enclosing a set of rotary vanes on a shaft and end members supporting the shaft. A low pressure inlet to the vanes is formed in one side of each end member and a high pressure outlet from the vanes is formed in the other side of each end member. A pair deformable strips are affixed in grooves in the exterior surface of the cartridge which extend in an axial direction at positions that separate the low pressure inlet side from the high pressure outlet side. The cartridge is inserted into a housing having a fluid inlet port and a fluid outlet port to establish a first path between the fluid inlet port of the housing and the low pressure inlet of the cartridge and a second path between the high pressure outlet of the cartridge and the fluid outlet port of the housing. The deformable strips align the end members and the sleeve.

Abstract: A fluid displacement apparatus includes a housing having a fluid inlet and fluid outlet. A suction chamber is formed between the first end of the displacement mechanism and the housing and communicates with the fluid inlet port. A discharge chamber is formed between the second end of the displacement mechanism and the housing and communicates with a hollow space. The hollow space is created between the inner block and the housing and communicates with the outlet port. Sealing devices are disposed between the suction chamber and the fluid inlet port for sealing the mating surfaces between the suction chamber and the fluid inlet port. The suction mechanism of the fluid displacement apparatus is thus easily assembled.

Abstract: A sea water pump (130) for a marine propulsion system includes a housing (130) having a generally cylindrical pumping chamber (134) defined by a generally cylindrical sidewall (136) extending axially between opposite end walls (138 and 140). A multi-vaned rotary impeller (44) in the chamber is driven by an impeller shaft (28) extending axially into the chamber through one of the endwalls (40). An intake port (146) at the other endwall (140) has a first branch (148) providing radial flow (170, 172) into the chamber, and a second branch (154) providing axial flow (178) into the chamber. A discharge port (158) has a first branch (160) receiving radial flow (174, 176) out of the chamber, and a second branch (166) receiving axial flow (180) out of the chamber.

Abstract: A fluid pressure operated device including a gerotor (17) including an orbiting and rotating star (27). A balancing plate (19) is biased into engagement by means of pressurized fluid in a space (102), with an adjacent end surface (28) of the star (27). Adjacent the balancing plate (19) is a housing member (21) defining a seal chamber (83), in which is disposed a seal assembly (89), including a support member (91) and a seal member (93) disposed radially inward from the support member. The outer periphery (92) of the support member (91) is disposed radially outward of a tangent circle (TC) of the bolts (11), thereby moving the pivot point (PP) of the balancing plate (19) further outward radially. This results in an improved ability of the balancing plate to follow the end surface of the gerotor star, whether the height of the star is more or less than that of the gerotor ring (23). As a result, volumetric efficiency is improved, even while the manufacturing cost of the gerotor gear set (17) may be reduced.

Abstract: A scroll-type fluid machine in which the high-pressure chamber side (36) of a back pressure chamber (6a) using a fixed scroll (11) made of an aluminum base material can be fully sealed. The fixed scroll (11) is made of an aluminum base material, and a discharge cover (2) is made of a ferrous material. Between the U seals (35) interposed between the high-pressure chamber (36) side of the back pressure chamber (6a) and the low-pressure side, at least the U seal (35a) on the high-pressure chamber (36) side is made of glass-reinforced polytetrafluoroethylene resin, and is installed so as to be pressed against the fixed scroll (11). The U seal withstands a high temperature and large pressure difference and is installed so that the sliding mating part of the U seal (35a) is not the fixed scroll (11) made of an aluminum base material which is easily worn, but the discharge cover (2) made of a ferrous material which is less prone to wear.

Abstract: There is disclosed in connection with a random orbital sander the utilization of improved arrangements for resiliently supporting an air motor, controlling the flow of pressurized air to the motor, and utilizing air exhausted from the motor to withdraw dust from a shroud arranged to collect dust generated incident to operation of the sander. Also disclosed is an alternative dust collecting arrangement, wherein the shroud is connected by a sander mounted duct to a source of vacuum.

Abstract: A longitudinally extending seal is provided which provides circumferential sealing of a motor cylinder in a bore and further provides retention orientation and alignment for the motor cylinder and end plates within the motor housing.

Abstract: A sliding-vane compressor of the type including a compressor body housed in a front head and a shell, wherein a cushioning member is disposed on at least one of a contacting surface between the front head and the compressor body and a contact surface between the compressor body and the shell for taking up vibration produced by the compressor body before the vibration is transmitted to the shell. The cushioning member which is disposed between a rear side block of the compressor and the shell may be formed integrally with a seal member.

Abstract: A scroll type compressor includes a housing having an inner chamber and fluid inlet and outlet ports connected to the inner chamber. A fixed scroll is mounted within the housing and has a circular end plate from which a first spiral element extends. An orbiting scroll is also mounted within the housing for orbital motion with respect to the fixed scroll, and includes a circular end plate from which a second spiral element extends. The fixed scroll and the orbiting scroll are maintained angularly and radially offset from each other so that the spiral elements interfit to form a plurality of line contacts between their spiral curved surfaces which seal-off and define at least one pair of fluid pockets. The orbital movement of the orbiting scroll relative to the fixed scroll shifts the line contacts along the spiral curved surfaces of the spiral elements which changes the volume of the fluid pockets.

Abstract: An hermetic type scroll compressor is disclosed which includes first and second cup shaped casings and a center block therebetween. The first cup shaped casing is provided with a fixed scroll affixed within the first cup shaped casing, orbiting scroll interfitted at an angular and radial offset with the fixed scroll, rotation preventing device disposed between the orbiting scroll and the center block. The second cup shaped casing is provided with a drive mechanism. The first cup shaped casing and the second cup shaped casing are releasably and hermetically secured through the center block thereby enabling disassembly, reassembly and indepedent inspection of the hermetic type scroll compressor components.

Abstract: A transmission pump has a cylindrical body sized to fit in a bore in the transmission housing. Inlets and outlets are circumferentially spaced on the cylindrical body. Convoluted ring type seals are arranged on the outer surface of the body in order to allow the inlets and outlets to have profiles that are closer to or even axially overlap, allowing for greater size within a limited axial body length.

Abstract: A screw compressor which a casing defining therein a pair of cylindrical chambers axially intersected, and a pair of male and female screws in an intermeshing relationship. The casing includes an inlet port having a profile composed of an open area fully open to the chambers and the remaining solid area occupied with one portions of shafts of the screws and with one portion of the casing, said profile being equal to a profile of the chambers, such that the fluid can flow freely into the chambers without causing turbulent fluid flow.

Abstract: A pump device connected to an AC generator for a car includes shoulder portions formed on both side surfaces of a plate or the side surface of an end frame and a housing, and chamfered portions or grooves formed in the end frame and the housing or the plate at positions corresponding to the shoulder portions. Packings are placed in spaces formed by the plate and the end frame and the housing.

Abstract: In a vane pump of the type comprising a rotor including radially slidable vanes, a cam ring accommodating the rotor, a front body and a rear body secured to both sides of the cam ring for defining pump chambers together with the cam ring, there is provided an intermediate body having an inner opening for accommodating the cam ring. The intermediate body is disposed between the front and rear bodies, and a portion of the inner opening is bulged outwardly to form a fluid passage for conveying operating fluid from the body to the rear.

Abstract: In a cam ring of a vane pump having a contoured bore whole wall is constantly and slidingly engaged by the radially outermost ends of vanes during rotation of a rotor, a radially inner part of the cam ring including the wall of the contoured bore is formed of sintered alloy while a radially outer part surrounding the inner part is formed of a material which prevents working fluid from oozing out therethrough. The outer part comprises a moulding of plastics, a die casting or a piece blanked from a steel sheet.

Abstract: A scroll type fluid displacement apparatus is disclosed having an adjustment mechanism for adjusting the axial clearance between the spiral elements and end plates of the fixed and orbiting scrolls. The apparatus includes a housing having a front end plate and a cup shaped casing attached thereto; the cup shaped casing has a fluid inlet port and a fluid outlet port. A fixed scroll, which includes a first end plate and a first spiral element, is fixedly disposed within the interior of the cup shaped casing. A large threaded opening is formed through an end plate of the cup shaped casing. An adjusting screw is screwed in the threaded opening to abut against the end surface of the fixed scroll. After adjusting the axial clearance between the fixed and orbiting scrolls by adjusting the position of the adjusting screw, a plurality of bolts fasten the fixed scroll to the cup shaped casing to prevent further axial movement.

Abstract: A scroll-type fluid displacement apparatus, in particular, a compressor unit is disclosed. The unit includes a housing comprising of a cup shaped casing and a front end plate member. A fixed scroll member with a first end plate means and a first spiral element is fixedly disposed within the interior of the cup shaped casing by a plurality of screw members screwed from the outside of the cup shaped casing through a fixed member, such as a plurality of legs or annular projection, which is disposed between the end surface of the first end plate means and the inner surface of the cup shaped casing. A seal ring is disposed between an outer peripheral surface of the end plate and the inner surface of the casing. An inner chamber of the casing is thereby partitioned into two chambers by the end plate.

Abstract: A vane pump driven by an engine to serve generally as a source of hydraulic fluid pressure for operating a power steering apparatus.A high pressure chamber (13) is formed either in a pump housing (4) or in a cover plate (6) by casting using a core. An end of the pump housing (4) or of the cover plate (6) defines a slide surface (11) with which a rotor (2) and vanes (1) are slidably and directly engaged, thus being formed with delivery ports (12) or suction ports (29). This precludes the need of a side plate, a spring for biasing the side plate against the rotor, and others which have hitherto been indispensable for a vane pump, so that the total number of components parts is reduced.A cam ring (5) is sandwiched between the pump housing (4) and cover plate (6) and locked together to the pump housing (4). This makes it needless to form a bore in the pump housing (4) for accommodating a cam ring and thereby enhances the machinability of such a pump.

Abstract: A gear pump for pumping hydraulic fluid includes housing, a pair of gears mounted for rotation within the housing, and a drive shaft affixed to one of the gears for transmitting a rotational input force to that gear. The drive shaft includes a portion extending outwardly beyond the housing. A bushing is provided surrounding the drive shaft and secured to the housing so that the drive shaft is free to rotate within the bushing. The bushing is positioned along the drive shaft between the driven gear and the portion of the drive shaft that extends beyond the housing. The bushing includes an end surface facing the driven gear and an annular recess in the end surface adjacent the drive shaft. A dynamic sealing member is positioned within the annular recess for minimizing the amount of leakage of the pumped fluid along the drive shaft.

Abstract: The eccentric disc pump has a series of stator discs defining a series of axially interconnected pump stages each having a rotor disc mounted eccentrically on a common shaft extending within central cavities of the stator discs and angularly offset relative to the rotor disc of a preceding pump stage, adjacent stator and rotor discs being angularly offset one relative to the other at given angles of displacement and coupling means, e.g. rods, wedges and grooves or studs and recesses, respectively engaging each stator disc with that of an adjacent pump stage and positively locating such adjacent stator discs in positions, offset by a second angle one half of the first mentioned angular displacement between corresponding adjacent rotor discs whereby in each pump stage the cavity of the stator disc forms an enveloping curve for the path of the rotor disc rotatable therein.

Abstract: A positive displacing machine has a housing having an interior chamber provided with an open end, a cover closing the open end of the chamber, movable working members located in the chamber and in operation producing high pressure in the same, sealing means including an annular groove formed in one of the elements around the open end of the chamber and a sealing member received in the groove, and a further annular groove formed in one of the elements radially outwardly of the first-mentioned groove and communicating with a space which is under pressure lower than the pressure in the interior chamber of the housing. The housing may have two open ends closed by two covers, and the above grooves may be provided in both end portions thereof. The grooves may be formed both in the housing, and in the covers. The further grooves may be open at a circumferential surface of the housing.

Abstract: Rotary piston engine comprises a casing which includes a rotor housing and a pair of side housings secured to the opposite sides of the rotor housing. The housings are formed with water jackets which are mutually communicating to provide circulation of cooling liquid. The side housing is formed with reinforcement ribs so as to prevent deformation of the inner wall of the side housing.

Abstract: An improved mechanism such as an engine, pump, compressor, or the like, including two abutting housing members sealingly engaging each other and defining a chamber receiving a piston. The members are clamped together and at least one of the members is relieved over a portion of its area of abutment with the other, the relieved portion being remote from the chamber. Upon clamping, excellent contact stress at the boundary of the chamber is established to preclude gas leakage in spite of yielding or fretting of the parts during operation.

Abstract: An apparatus having mating housing parts including a thin metallic sheet disposed at the interface of the housing parts and having multiple, short prongs extending from a side thereof to embed within one of the housing parts to thereby prevent relative movement between the housing parts, and a seal carried by the sheet.

Abstract: A seal for a vane type fluid pressure motor or pump. The motor or pump comprises a housing having a chamber receiving a rotor, an elongated bore extends through the housing and the rotor and receives a shaft which is drivingly engaged by the motor through a splined connection. A seal assembly is disposed on either side of the rotor to prevent leakage from the area between the side walls of the rotor and the side walls of the chamber and into the elongated bore. Each seal assembly is comprised of a cylindrical sleeve affixed to a side wall of the rotor and extends axially therefrom. The assembly is disposed in an annular recess in the bore at a point adjacent the rotor. The sleeve is affixed to the rotor for rotation therewith and is spaced from an undercut portion of the housing wall. The undercut defines the annular recess. An annular elastomeric sealing member is disposed in the recess and is affixed at its radially outward side to the recess wall and surrounds and snugly engages the sleeve.

Abstract: A rotary mechanical vacuum pump has a pump chamber formed of aluminum which has been treated by hard anodizing the working surfaces of the pump chamber and the lapped mating surfaces between the parts surrounding the chamber, with a high vacuum grease applied to such mating surfaces and providing an effective seal against leakage between the pump chamber and the ambient atmosphere.

Abstract: In a rotary piston type engine including a casing comprising a rotor housing and a pair of side housings, a sealing member disposed between each of the side housing and the rotor housing for sealing combustion gas from working chambers and engine cooling liquid from coolant passage means in said housings, said sealing member comprising a rubber body and a heat resistant layer integrally moulded with the rubber body and disposed to face the working chamber so as to protect the rubber body against the heat of combustion gas.

Abstract: Disclosed herein is a rotary internal combustion engine comprising a unitary housing member including first annularly extending wall means including an outwardly facing surface partially defining a cooling jacket extending generally circumferentially around the first wall means, and an inwardly facing surface partially defining a rotor cavity, together with second wall means extending in outwardly spaced relation from the first wall means and including an inwardly facing surface in opposing relation to the outwardly facing surface of the first wall means to further partially define the cooling jacket, and web means extending generally transversely to and joining the first and second wall means.

Abstract: An improved positive displacement motor suitable for use in downhole drilling at the end of a drill string and driven by fluid, e.g., liquid mud, under high pressures. The motor has a novel arrangement of inlet and outlet ports in longitudinally extending circumferentially spaced rows for providing fluid at a substantially uniform pressure along substantially the length of the blades driving the motor so as to equalize the driving torque along the length of the rotor and avoid pressure differentials tending to twist the blade. A continuous ring isolates the adjacent rows of inlet and outlet ports.

Abstract: A seal means which is mounted in a groove means provided between the working chamber and coolant flow passages of a rotary piston engine and is constituted by a main member which is compressively flexed between the groove means and the opposite mating surface of a housing, a first backup element made of a flexible material and a second backup element made of a metal which are provided on the outer side of the main member, and a heat-resistant element which is provided on the inner side of the main member, the first and second backup element preventing movement of main member portions into any gap formed between housing mating surfaces at an interface, whereby the main member is protected from wear and the service life of the seal means is increased.

Abstract: A rotary piston type engine comprising a casing and a rotor in said casing, said casing including a center housing and a pair of side housings secured to the center housing at the opposite sides thereof, a plurality of cooling fluid passages extending axially through said center housing and communicating with corresponding passages in said side housings, each of said passages in said center housing being inclined from the opposite ends thereof to the intermediate portion thereof toward radially inwardly of the casing, and also decreased in the cross-sectional area at the intermediate portion.

Abstract: A rotary combustion engine having a completely die cast aluminum housing assembly wherein one of two end housings is rigidly secured and sealed to one open end of an outer barrel housing in which either one rotor housing or two or more rotor housings separated by an intermediate housing are radially confined. The other end housing is secured and sealed to the other open end of the outer housing to clamp the radially confined housing or housings with a predetermined load within the tolerance stack-up of the clamped parts. With this arrangement the outer housing grows with the clamped parts in the axial direction as a result of heat expansion during engine operation to prevent an excessive change in the clamp load while good sealing is maintained.

Abstract: A high-speed rotary vacuum pump has a compression chamber which is spaced from the walls of a housing by at least one body of acoustic insulation material which acts to absorb noise, to position the chamber with respect to the housing, and to form a fluid-tight seal between the chamber and the housing in the region where the rotary drive shaft of the pump projects from the compression chamber. The drive shaft and the gas inlet and outlet ducts are also acoustically insulated.