Robert Boschgmbh

Karl-Heinz Muller

Wilhelm Dworak

Siegfried Mayer

Wolfgang Talmon

Claus Jons

Kurt Grabow

Martin Fader

Heinrich Kochendorfer

Dieter Bertsch

Jan Vlemmings

Ivan Sauer

Jurgen Zorn

Willy Mahl

Eugen Hartmann

Jorg Anhenn

Guenter Wolff

Paul Bosch

Klaus Lehmann

Gunter Wolff

Klaus Griese

Dietrich Schuldt

Manfred Rasper

Rudolf Muller

Werner Muhlbauer

Gear Machine for a pump or engine having bearing members with

A resonant circuit which includes the input capacitance of the clock pulse inputs of a shift register (10) is pulsed by a sinusoidal wave at voltage peaks of the wave by an oscillator delivering barely enough energy to overcome the damping of the resonant circuit. The oscillator may be crystal controlled and, instead of having a single ended output for delivering energy only on peaks of one polarity, may be in push-pull form reinforcing oscillation peaks of both polarities. This circuit is easily combined with arrangements for switching oscillator frequency from one value to another and/or arrangements for interrupting the clock pulse output for timed intervals after each loading or unloading of the shift register. The loss power dissipation is reduced to about 6% of the loss power dissipation of a square pulse drive for the clocking of the same shift register. The low loss drive for shift register advancement is applicable to a variety of analog stepped storage and delay devices, such as charge coupled devices and 'bucket brigade' devices.

System for shift register clocking of analog storage cells

A hydraulic gear machine which is particularly suited for use as a reversible hydraulic gear motor includes a pair of gear elements having externally meshing outer peripheral gear portions and stub shafts which are supported in an internal chamber of a housing on respective sleeve-shaped bearings. Two such bearings are arranged at each axial side of the gear elements, one for the stub shaft of each of the gear elements which extends to this axial side. The housing includes a circumferential wall and two end walls. Sealing elements having the configuration of the numeral three are arranged at the interfaces between the bearings and the end walls. The sealing elements are oppositely oriented with respect to a common plane including the axes of rotation of the gear elements at the respective axial sides. Depending on the direction of flow of pressurized hydraulic medium through the machine, a dominating pressure zone builds up at one or the other of the interfaces, the effect of the pressure of the pressurized medium on this pressure zone being to press the bearings in a sealing manner against the gear elements to eliminate gaps therebetween through which the pressurized hydraulic medium could otherwise escape without transferring its energy to the gear elements as useful mechanical energy.

Gear machine with oppositely aligned sealing elements

An arrangement for centering an end wall of a housing of a hydraulic gear machine, such as a pump or a motor, with respect to the open end of an internal chamber provided in a housing body forming the circumferential wall of the housing includes a plurality of pins which are received in a press-fitting manner in bores of the end wall and protrude beyond an end face of the end wall which faces and closes the open end of the chamber in the mounting position. The pins may have contact surfaces which are turned to the same diameter as the corresponding inner surface of the housing body which bounds the open end of the chamber, or they may exactly fit into the open end, or overlap slightly with the inner surface in which event some material displacement or deformation takes place during the assembly of the end wall with the housing body. The bores in the end wall may be equiangularly distributed along a circle centered on an axis coinciding with that of an opening for a drive shaft in the end wall and, in the mounting position, with that of a circular section of the inner surface at the open end. A cylindrical projection may be provided at the other end face of the end wall for clamping the end wall in a clamping arrangement of a material-removing machine during the material-removing operation for producing the contact surfaces of the pins.

Gear machine centering arrangement

A gear machine, such as a gear pump or gear motor, has a housing in a chamber of which there are journalled two gears which mesh with one another. One of the gears is mounted on a drive shaft the end of which is extended outwardly from the housing. The housing is closed at one side thereof with a cover having a stepped bore for receiving the end portion of the drive shaft. The cover is formed with a circumferential projection concentric with the drive shaft and adapted for centering the cover relative to an external element to be coupled with the gear machine. The stepped bore provided in the cover forms a chamber in which a centering ring with a certain radial play is positioned, which centering ring surrounds the drive shaft. A sealing ring is also positioned in the chamber formed in the stepped bore, which sealing ring sealingly closes the housing. The centering ring provides for reliable aligning of the gear machine to the external element adapted to be coupled with the machine.

Fluid-operated gear machine

A gear positive displacement machine has a housing, two gear members, and two bearing members supporting the latter. A gap is formed between an inner wall of the housing and a respective one of the bearing member, the gap increasing in two opposite axial directions. It may start from a central transverse plane of the bearing member. The gap may be formed by a convex peripheral surface of the bearing member or by a convex inner wall of the housing.

Gear positive displacement machine with gaps between bearing members and

A gear positive displacement machine has two meshing gear members each having two axially opposite shafts, two pairs of bearing members each of which pairs bears one shaft of both gear members, at least one sealing member at one axial end of the gear members, and a supporting element reinforcing this sealing member. The supporting element has a U-shaped cross-section with two arms and a bead at a free end of each arm. The sealing member is inserted by its base side in the supporting member, and the beads of the arms of the latter engage in two grooves formed in the supporting member.

Gear positive displacement machine with U-shaped supporting element for

A gear pump or a hydraulic gear motor has two pairs of meshing external gears, in which the teeth of one of the gears of each pair of gears are circumferentially displaced with respect to the teeth on the other gear of the pair. The gears arranged on the drive shaft are connected by the latter by an internal gearing, especially by splines, whereby the number of the teeth of the internal gearing is an even multiple, especially twice, the number of the external teeth of these gears.

Gear machine operable as pump or motor with axially spaced and

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.

Leakage prevention means for a positive displacing machine

An external gear type hydraulic pump or motor wherein the trunnions of gears in the chamber of the housing are surrounded by annular bearing members. The peripheral surface of each bearing member defines with the adjacent internal surface of the housing an arcuate gap whose width increases in a direction toward the respective end face of the corresponding gear. To this end, portions of or the entire peripheral surfaces of bearing members and/or portions of or the entire internal surfaces of the housing have a conical or spherical shape. The gaps are located in the low-pressure zone and reduce the likelihood of wear upon those end faces of bearing members which are adjacent to the end faces of the gears because the bearing members can tilt in response to increasing load without localized rubbing against the gears. Additional gaps can be provided between the end faces of the gears and the adjacent end faces of the bearing members to further reduce the likelihood of uneven wear upon the bearing members.

External gear type fluid displacing machine with bearing gap

An external gear pump wherein the gears are installed in an eight-shaped compartment of a central housing section which is flanked by two covers. The outlet port of the housing communicates with two arcuate recesses for metallic inserts which are biased against the adjacent gears by fluid pressure in the outlet port whereby the inserts urge the gears against those portions of the internal surface of the central housing section which are located opposite the recesses. Such portions of the internal surface are formed with narrow first cutouts which communicate with the outlet port. The internal surface is further formed with relatively wide additional cutouts which are located between the first cutouts and the recesses and communicate with the inlet port. The force which is produced by fluid in the cutouts opposes the force which urges the gears against the internal surface of the central housing section to thus reduce the force with which the stubs of the gear shafts are urged against the housing.

Gear type pump or motor with radial balancing

A housing of the gear motor accommodates a pair of meshing gears which are rotatably mounted in the interior of the housing and which each have a first and a second axial end face. Sealing elements are provided which are located proximal to the respective axial end faces, and an arrangement is provided for forming first fluid-pressure fields which press the sealing elements against the axial end faces. Adjacent at least one of these sealing elements there is provided a space in which an auxiliary fluid pressure field can develop, and an arrangement is provided by means of which the space can be pressurized when it is desired to form therein the auxiliary fluid pressure field so that the same may exert auxiliary pressure upon the associated sealing element to aid in pressing the same against the respective axial end face, and by means of which the space can be vented when such auxiliary pressure is not desired.

Gear motor with valve controlled pressure biased end seals for

A hydraulic gear machine which may be utilized as a pump or motor has a housing forming a cavity in which a pair of gears having meshing teeth is mounted for rotation. Sealing elements are interposed between the axial ends of the gears and the bearings mounting the gears for rotation; these sealing elements have first surfaces which face the gears and second surfaces facing the bearings and being formed with recesses which form fluid-pressure spaces. At least one seal member is provided adjacent the respective second surfaces and serves to delimit the respective recess. Each seal member has one sealing face which engages an inner circumferential wall of the housing and another sealing face which engages an outer surface of one of the associated sealing element and bearing, which outer surface extends circumferentially of the axis of rotation of the gears.

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Vaihingen, Germany

Karl-Heinz Muller