Abstract: A metering valve for the drop feeding of a liquid lubricant includes a metering assembly disposed in a valve chamber having an inlet and an outlet. The metering assembly includes a cylindrical member having a peripherally disposed spiral groove. A sleeve is press fit on the cylindrical member to render the groove a closed spiral metering channel. The metering channel communicates with an outlet in the cylindrical member that is generally aligned with the chamber outlet. An O-ring seal surrounds the aligned outlets and is disposed between the floor of the chamber and the metering assembly to preclude passage of lubricant from the chamber except by passage through the metering assembly.

Abstract: A hydraulic cylinder, such as more particularly the master cylinder of motor vehicle hydraulic brake system or of a motor vehicle clutch hydraulic control system, provided with a relatively thin plated coating, autocatalytically or electrolessly deposited, of nickel phosphorous matrix containing sub-micron particles of a polyfluorocarbon resin, preferably polyfluoroethylene. The plated coating provides a good wearing surface having self-lubricating properties provided by the exposed polyfluorocarbon resin particles smearing the surface of the coating, and reducing considerably squeaking noise during operation of the master cylinder. Alternatively, or additionally, the surface of the pistons may be provided with a plated coating.

Abstract: A screw rotor assembly having nonsymmetrical tooth profiles and used in a screw-type rotary compressor or expander. The tooth profile of the female rotor is formed such that a line (H.sub.2 -A.sub.2) is formed by a generated curve of a point A.sub.1 of the male rotor; a line (A.sub.2 -B.sub.2) is formed by a circular arc having a point O.sub.7 as the center of the arc and a radius R.sub.7 ; a curve (B.sub.2 -C'.sub.2) is formed by an envelope developed by a circular arc (B.sub.1 -C.sub.1) of the male rotor; a portion between points D'.sub.2 and E.sub.2 is formed by a circular arc having a point O.sub.1 as the center of the arc and a radius R.sub.1 ; a line (C'-D') is formed by a line smoothly connecting the curves (B.sub.2 -C'.sub.2) and (D'.sub.2 -E.sub.2); a curve (E.sub.2 -F.sub.2) is formed by a circular arc having a point O.sub.2 as the center of the arc and a radius R.sub.2 ; and a curve (F.sub.2 -G.sub.2) is formed by a circular arc having a point O.sub.8 as the center of the arc and a radius R.sub.8.

Abstract: A rotary fluid pump has a rotor with a sinusoidal, undulating, vane projecting radially from a hub portion rotatable in a pump chamber having a suction chamber, discharge chamber and a transport zone extending circumferentially from the suction chamber to the discharge chamber. The transport zone has a cylindrical inner periphery which is slidably engaged by the periphery of the rotor vane and opposite planar end walls slidably engaged by crests of the undulating vane. Between the suction chamber and the discharge chamber there is a gate assembly with two sliders engaging opposite sides of the vane respectively and interconnected by a bow spring so that they move together. The gate assembly, rotor and casing parts forming the pump chamber are all contained in a cylindrical outer housing, from which they are easily removed for cleaning, inspection and replacement.

Abstract: A slide valve type screw compressor having a slide valve with a surface of chevron shape in section consisting of a couple of arcuately curved surfaces forming part of the inner wall surfaces of a rotor chamber accommodating a pair of intermeshed male and female screws, the slide valve being slidable in the axial direction of the rotors for communicating the rotor chamber with a suction port through an opening with an adjustably variable area for volumetric control of the compressor, characterized in that the slide valve is retractably protruded into a suction casing at a fore end on the side of the suction port and has the opposite outer corner portions of the curved surfaces cut off at a predetermined angle with the longitudinal axis thereof to provide a substantially triangular section with a forwardly reduced width at the protruded fore end.

Abstract: A compressor comprises an hour-glass screw meshing with a pinion-wheel and a slide operable to obstruct partly a discharge port so as to increase the compression ratio by delaying the discharge moment. An edge of a part of the slide is used to obstruct the discharge cavity. The other edge of this part is provided with a removable spacer hvaing a thickness adapted to fill the slide-groove for a given adjustment of the slide. If the slide is moved so as to vary the compression ratio, a spacer having another thickness may be mounted to avoid modifying the volumetric capacity.

Abstract: An improved supercharger or blower (10) of the Roots-type with reduced airborne noise and improved efficiency. The blower includes a housing (12) defining generally cylindrical chambers (32, 34) containing meshed lobed rotors (14, 16) having the lobes (14a, 14b, 14c, 16a, 16b, 16c) thereon formed with an end-to-end helical twist according to the relation 360.degree./2n, where n equals the number of lobes per rotor. The chambers include cylindrical wall surfaces 20a, 20b and end wall surfaces 20c, 24a which sealing cooperate with the rotor lobes and ends. Blower housing (12) also defines inlet and outlet ports (36, 38). The inlet port includes a longitudinal extent defined by housing wall surfaces (20f, 20f) and a transverse extent defined by housing wall surfaces 20g, 20i. Transverse wall surfaces (20g, 20i) are disposed substantially parallel to the associated rotor lobes.

Abstract: An improved supercharger or blower (10) of the Roots-type with reduced airborne noise. The blower includes a housing (12) defining generally cylindrical chambers (32, 34) containing meshed lobed rotors (14, 16) having the lobes (14a, 14b, 14c, 16a, 16b, 16c) thereon formed with an end-to-end helical twist according to the relation 360.degree./2n, where n equals the number of lobes per rotor. Blower housing (12) also defines inlet and outlet ports (36, 38). The inlet port includes a longitudinal extent defined by housing wall surfaces (20f, 20h) and a transverse extent defined by housing wall surfaces 20g, 20i. Transverse wall surfaces (20g, 20i) are disposed substantially parallel to the associated rotor lobes. The outlet port includes a longitudinal extent defined by housing surfaces (20m, 20r) and a transverse extent defined by housing surfaces (20p, 20s). Spaces (32a, 34a) between adjacent lobes of each rotor transfer volumes of low-pressure inlet port air to relatively high-pressure outlet port air.

Abstract: An improved supercharger or blower (10) of the Roots-type with reduced airborne noise. The blower includes a housing (12) defining generally cylindrical chambers (32, 34) containing meshed lobed rotors (14, 16) mounted for rotation about parallel, transversely spaced apart axes. The rotor lobes (14a, 14b, 14c, 16a, 16b, 16c) are formed with an end-to-end helical twist according to the relation 360.degree./2n, where n equals the number of lobes per rotor. Blower housing (12) also defines inlet and outlet ports (36, 38) having transverse and longitudinal boundaries. Spaces (32a, 34a) between adjacent lobes of each rotor transfer volumes of low-pressure inlet port air to relatively high-pressure outlet port air. The longitudinal boundaries of the inlet port are defined by transversely extending wall surfaces (20f, 20h) and the transverse boundaries are defined by wall surfaces (20g, 20i) disposed substantially parallel to the associated rotor lobes.

Abstract: A vane pump having a flow regulating bypass valve activated by outlet pressure to direct excess flow back to the inlet is provided with a channeling having an element comprising a plug insertable in the valve housing, which plug has a specially shaped flow bend in the form of an arcate groove that forms a smooth transition for combined flow from a tank fed inlet and from the bypass valve to the pump inlet. This is effected by connecting a channel from the tank inlet and bypass valve to a channel for flow return to the pump inlet which channels are angularly related. Since the valve housing is die cast the difficulty of providing, in a casting, an exactly shaped smooth surfaced and accurately dimensioned transition passage between the aforementioned channels is overcome by the invention.

Abstract: A rotary piston machine, in order to avoid losses due to compressed flows, has adjacent to a generating and/or sealing contact edge (21, 22) at least one recess (11a, 11e) and/or opening (12a, 12b) which extends beyond the contact curve (14a-14c) in at least approximately the direction of motion of the surfaces moving in relation to each other during the stroke or passage of the piston (6a") through the shut-off driver. The spatial dimensions of the recesses and/or opening are such that the flow in it is not substantially accelerated even when the direction is changed. An opening (11g, 11g') can be closed insofar as it is located in a nonmoving ring (6b). To prevent low pressures between surfaces moving away from each other (9c, 14c) a pressure compensation space (11e) is connected to the contact line (14c) of one of the surfaces.

Abstract: A screw compressor having a recess formed in the high-pressure end surface of the casing. This recess receives the fluid from a closed working space which has just been isolated from the discharge port and closed in the compression step. Consequently, the abnormal pressure rise in the closed working space, which is caused due to the compression of the fluid confined, is completely eliminated. The recess has a configuration involving a curve conforming with the leading flank of the female rotor at the instant at which the working space is isolated from the discharge port and closed.

Abstract: A rotary fluid machine such as, for example, a screw compressor, a centrifugal compressor, or a pump, is provided with a thrust bearing mounting unit adapted to maintain natural frequencies of bending vibrations of rotors thereof within ranges of permissible values. The axial rigidity of the mounting unit is at least as high as that of the thrust bearings and the radial rigidity thereof is made to be not more than half that thereof. When a radial load is applied to the thrust bearings, the bearing mounting unit is deformed solely substantially in the radial direction and the thrust bearings bear substantially no radial load.

Abstract: A pump device comprises a housing having an air intake port and an air discharge port, and with its inner peripheral surface being formed in a cylindrical shape; a rotor mounted in said housing and rotating eccentrically in said housing; a plurality of vanes mounted in said rotor and getting into slide-contact with the inner peripheral surface of said housing with rotation of said rotor so as to send under pressure the gas from said air intake port to said air discharge port; a communicating port defined by said vane, the inner peripheral surface of said housing, and the outer peripheral surface of said rotor, and communicatively connected with said operating chamber; and a gas storing chamber for sending and receiving the gas between it and said operating chamber through said communicating port to reduce a pressure differential in said air discharge port and said operating chamber.

Abstract: There is shown a pressure loaded external gear pump with a low pressure lubrication system. The low pressure lubrication system utilizes the viscous shear pumping effect which occurs between the shafts and bearings to draw fluid from the inlet port, circulate it past the bearings and then return it to the inlet port.

Abstract: A rotary slide vane pump for steering booster systems has a flow control valve which bypasses flow from outlet side to suction side with increase in speed as heretofore known. The flow channels or passages that conduct bypass flow change the direction of the flow at a juncture point between passages, such directional change being a right angle, radially downstream from the bypass valve to longitudinally at the point of juncture to the suction side, likewise as heretofore known. In the present invention there is provided a transition piece between the channels at the right angle juncture in the form of a screw in the pump body and having a flat face disposed flush with the longitudinal channel and transversely of the radial channel. The provision of such transition piece has been found to effect an increase in suction pressure when bypass flow is added to normal suction flow, such increase being over and above that effected by the prior art.

Abstract: This invention, a variable displacement sliding vane pump/hydraulic motor, incorporates an eccentric chamber in which a rotor with a plurality of axially and radially moveable sliding vanes rotates. Axial positioning of the sliding vanes is accomplished by positioning a sliding wall; the swept volume and therefore the capacity of this invention is also directly related to the positioning of the sliding wall. This sliding wall can be positioned by external means including conventional manual and automatic devices. Various embodiments permit pumping capacity variability from essentially zero flow to full flow without the use of bypasses.

Abstract: A hydraulic pump motor components including at least two co-acting gears arranged in wells which conform to the gears and which communicate with channels for supply and return oil respectively. To enable the displacement of the pump or motor to be readily changed, the housing of the pump or motor is made in two parts (1, 2) which can be sealingly coupled together. The one part (1), the mounting part, in which the input shaft (3) of the pump, or the output shaft (3) of the motor, is journalled is provided with an inlet and an outlet (10, 11) for supply and return oil respectively. The shaft (3) passes completely through the mounting part (1) and projects from the end surface of the mounting part located in the dividing plane of the housing, for receiving a sun wheel (5). The journal shafts (8, 9) for the planet wheels (6, 7) also project out from the end surface, and channels for supply and return oil respectively discharge into this end surface.

Abstract: A rotary piston displacing machine for use as a pump compressor or power engine, as well as a hydrostatic coupling. The machine has a disk-shaped rotor rotatable in a housing, several similar diametrically opposed rotary vanes which penetrate the annular groove of the working space, which vanes can be joined or formed together in a second rigid rotor, the impeller, the disk-shaped rotor having a rotational axis forming an acute angle with the axis of the impeller. The disk-shaped rotor is positioned obliquely on the working space and is provided with radial slots for receiving the vanes which reach down to the bottom of the working space to sealingly lock the adjacent working chambers formed in the working space. The displacement operation takes place by the rotation of the vanes and the changing cross-section of the groove of the working space. If the cross-section of the working space approaches zero on one point of its periphery, i.e.

Abstract: The invention relates to a device for dosing or for pumping in a controlled manner a liquid or slurry, a device having a piston freely reciprocating in a cylinder; members connected to the cylinder on the opposite sides of the path of the piston movement for feeding the liquid or slurry under pressure into the cylinder in order to move the piston or for discharging liquid or slurry from the cylinder by means of the pressure of the liquid or slurry directed into the cylinder to the opposite side of the piston, when the piston returns; a valve member in the feed and discharge members of the liquid or slurry for their alternate opening and closing; switches fitted at the ends of the cylinder for sensing the position of the piston; and a control unit for controlling the stroke frequency of the piston, and thereby the volume flow of the liquid or slurry, and for transmitting the signal given by the switch to the valve member in order to open and close it at different positions of the piston.