Abstract: A safety device limits the pressure in an axial-piston compressor with variable piston displacement. The compressor has as wobble plate or swash plate whose tilt angle can be variably controlled by the pressure differential between the high pressure in the discharge pressure zone and the pressure in the piston-drive chamber. The safety device consists of a valve arranged in a connector channel between the discharge pressure zone and the pressure zone of the piston-drive chamber. When the discharge pressure exceeds a given pressure limit, the safety device responds by allowing an increased flow of pressure medium from the discharge pressure zone to the piston-drive chamber. The influx of pressure medium into the piston-drive chamber causes a reduction of the tilt angle of the swash plate or wobble plate.

Abstract: In a needle valve (1) for a high-pressure gas conduit system consisting of two units (2, 3) which are joined and one of which encloses a stepping motor (8) and the other includes gas flow passages and a gas flow control bore (17), a valve needle (10) is supported in the housing unit which includes the stepping motor so as to be movable by the stepping motor and extends into the gas flow control bore (17) in the other housing unit through a guide passage (18) provided with sealing means to prevent gas from flowing to the housing unit including the stepping motor (18). The needle valve is particularly suitable as an expansion valve in an automotive CO2 air conditioning system.

Abstract: A compressor for the air conditioning system of an automobile, having a housing and a compressor unit arranged in the housing for taking in and compressing a refrigerant. The refrigerant flows from an intake area through the compressor unit into a discharge area likewise formed in the housing cover, and the housing cover sealingly connects to the housing via connecting members. For reducing a load on the connecting members, the connecting area, through which the connecting members extend, is at least substantially separated from the pressure generated within the compressor.

Abstract: A compressor, in particular for a vehicle air conditioning system, with a housing, which contains a device for conveying a compressed medium driven by a drive shaft, designed as an axial piston machine and having at least one piston reciprocating in a cylinder block and a take-up plate connected to the piston working in combination with a swash plate rotating around a rotational axis, whereby the swash plate is connected to the drive shaft by a carrier and whereby the take-up plate encompasses a support device working in combination with a non-rotating thrust bearing.

Abstract: The pressure relief valve has a spring pressure-loaded diaphragm closing body (13), which in the closed position sealingly engages on a centrally positioned valve seating surface (10) surrounding a first valve opening (8). Its spring pressure loading takes place by means of a counterpressure body (13) positioned centrally over it. The valve seating surface (10) is surrounded by a channel-like valve chamber (11) in the valve housing body (2) and on which is provided on the overpressure side at least one second valve opening (9). To be able to dissipate high overpressures, the counterpressure body (30) is surrounded by a diaphragm support ring (17) held on the valve housing (6) and which has a circumferential recess (19), whose depth measured perpendicular to the diaphragm closing body (13) determines the maximum deflection of said body (13), so that when the valve is completely opened the diaphragm closing body (13) is supported in an area between the valve seating surface (10) and its outer edge.

Abstract: A compressor for the air conditioning system of an automobile, having a housing and a compressor unit arranged in the housing for taking in and compressing a refrigerant. The refrigerant flows from an intake area through the compressor unit into a discharge area likewise formed in the housing cover, and the housing cover sealingly connects to the housing via connecting members. For reducing a load on the connecting members, the connecting area, through which the connecting members extend, is at least substantially separated from the pressure generated within the compressor.

Abstract: The invention relates to an axial piston motor (1), especially a compressor for the air conditioning system of a motor vehicle, comprising a housing (2) and a compressor unit (6). Said compressor unit is driven by a drive shaft (8), is arranged in the housing (2), and is provided for sucking and compressing a cooling medium. The compressor unit (6) comprises pistons (15) which move in a reciprocating motion in a cylinder block (18) and comprises a drive disc (11) which rotates with the drive shaft (8) and which drives the pistons (15). The aim of the invention is to obtain a delivery rate which is independent of rotational speed. To this end, the invention provides that the mass of the drive disc (11) is calculated such that the centrifugal forces generated when the drive disc (11) is rotating are large enough to counteract the pivoting movement of the drive disc (11) while actively regulating the same, and to influence the piston stroke and thus the delivery rate, especially to reduce or to limit the same.

Abstract: A disc clutch wherein at least one first clutch disc, having internal teeth mating with the external splines of a first rotary hub, frictionally engages at least one second clutch disc, having external teeth mating with the internal splines of a second rotary hub coaxial with the first hub, when the clutch is engaged. Engagement of the clutch takes place in response to actuation of a cylinder-piston unit having a reciprocable piton which can directly or indirectly bear upon one of the two outer discs of the package including the first and second discs. The splines of the hubs and/or the teeth of the clutch discs are capable of undergoing deformation, particularly elastic deformation, to thus facilitate a more accurate selection of the magnitude of torque to be transmitted between the hubs by way of the frictionally engaged clutch discs.

Abstract: The piston (1) has a ball receptacle (14) for the rod head (4) of the piston rod (2) of a swash plate compressor. For absorbing particularly high pressures the rod head (4) has a relatively large diameter, so that the ball receptacle (14) extends close to the circumference of the piston (1). The piston wall (15) laterally surrounding the rod head (4) has a circumferential indentation (21) which, in the inwards direction, forms an uninterrupted undercut enclosing the spherical rod head (4).

Abstract: A compressor, in particular for a vehicle air conditioning system, with a housing, which contains a device for conveying a compressed medium driven by a drive shaft, designed as an axial piston machine and having at least one piston reciprocating in a cylinder block and a take-up plate connected to the piston working in combination with a swash plate rotating around a rotational axis, whereby the swash plate is connected to the drive shaft by a carrier and whereby the take-up plate encompasses a support device working in combination with a non-rotating thrust bearing.

Abstract: A compressor for an air-conditioning system of a motor vehicle is proposed, which has a controllable compression medium feed mechanism powered by a drive shaft and which, for example, is powered by the combustion engine of the motor vehicle by a belt driven by a drive shaft, where the belt is coupled with the drive shaft of the compressor. The compressor is characterized by the drive wheel (29) having a belt pulley body (31) engaged with the belt (33) and coupled via an elastic coupling element (35) with the drive shaft (7), and by the drive shaft (7) being equipped with a torque limiting mechanism (predetermined fracture point (65)). In the case of another version, it is envisaged that the support mechanism (127) contains a projection (137) protruding from the take-up plate (11) and preferentially forming a single piece with this, as well as a supporting element (139).

Abstract: The reciprocating piston engine has an annular swivel disk (6), driven by the engine shaft (5) and whose inclination with respect to the latter is adjustable, for driving circumferentially juxtaposed reciprocating pistons (2). For this purpose it is connected in articulated manner both to a sliding sleeve (21) axially guided on the engine shaft (5) and to a driver (13), which transmits the driving force and which is spaced from the engine shaft (5). As a result of the annular shape of the swivel disk, which is advantageous both dynamically and from the manufacturing standpoint a space-saving, articulated engagement of the driver (13) in a radial bore (16) of the swivel disk (6) is rendered possible.

Abstract: The piston (1) has a ball receptacle (14) for the rod head (4) of the piston rod (2) of a swash plate compressor. For absorbing particularly high pressures the rod head (4) has a relatively large diameter, so that the ball receptacle (14) extends close to the circumference of the piston (1). The piston wall (15) laterally surrounding the rod head (4) has a circumferential indentation (21) which, in the inwards direction, forms an uninterrupted undercut enclosing the spherical rod head (4).

Abstract: A compressor, particularly suited for use in the motor vehicle air conditioning system, having a compact and simple design. The housing is constructed of a body portion having a first wall area which defines the cavity containing the pumping unit and is designed to withstand the internal cavity pressure. A second wall area, not designed to withstand the internal cavity pressure, cooperates with a housing cover to seal the housing. The second wall area is under tension and is attached to the body by welding or by bending the second wall area. The cover includes a pair of pressure cavities separated by concentric annular sealing bridges. The sealing bridges have axially offset sealing surfaces which cooperate with a valve plate to seal off the two chambers. The sealing surface of the radially outer bridge may be formed of any elastic material. A drive-shaft and swash plate cooperate with a take-up plate to operate one or more pistons. A drive plate, integral with, or attached, as by welding, etc.

Abstract: A compressor for an air-conditioning system of a motor vehicle is proposed, which has a controllable compression medium feed mechanism powered by a drive shaft and which, for example, is powered by the combustion engine of the motor vehicle by a belt driven by a drive shaft, where the belt is coupled with the drive shaft of the compressor. the compressor is characterized by the drive wheel (29) having a belt pully body (31) engaged with the belt (33) and coupled via an elastic coupling element (35) with the drive shaft (7), and by the drive shaft (7) being equipped with a torque limiting mechanism (predetermined fracture point (65)). In the case of another version, it is envisaged that the support mechanism (127) contains a projection (137) protruding from the take-up plate (11) and preferentially forming a single piece with this, as well as a supporting element (139).

Abstract: The reciprocating engine more particularly intended for high pressure applications or motor vehicle CO.sub.2 air conditioning systems, has a wobble plate transmission, whose wobble plate (3) can assume different inclined positions for power control purposes. For this purpose is provided a wobble joint constructed as a knuckle joint, allowing the tilting movement of the wobble plate (3) supported on the engine shaft (4) through a slot guide (11, 11') of a driving pin (9). A good controllability of the reciprocating engine results from friction-reducing engine components provided on the driving pin (9) and comprising bearings (32, 33), which allow a rotation of the driving pin (9) about its longitudinal axis, as well as a sliding bush or a roller bearing (47) on one of the pin ends (40, 43) engaging in slot guides (11, 11'). In addition, in the vicinity of the more strongly loaded pin end is provided an axial force-absorbing sliding disk (42).

Abstract: The reciprocating piston machine has a wobble plate gear, in which the pins (2) are connected in articulated manner to the circumference of the wobble plate (3) by in each case one ball end (21), which engages directly or by means of an interposed slip ring (29) with a spherical inner face (30) in a guide (28) directed transversely to the piston axis. As this leads to the avoidance of connecting rods with in each case two ball ends, the machine can be given a more compact construction.

Abstract: The internally axed single-rotation machine has inlet and outlet channels , 6), which extend arcuately round the circular cylindrical housing space (11) enclosing the rotors (1, 2) to such an extent that the tangentially connecting inlet and outlet connections (12, 13) cross and the outlet channel (6) extends over part of the inlet channel (5). In the vicinity of this approach between the outlet and inlet channels (6, 5) there is a flow connection (19), which continues the arcuate shape of the outlet channel (6) to that of the inlet channel (5). The gas pressure in the outlet channel (6) is variable by a control element (20) located in said flow connection (19). The single-rotation machine pressure control is associated with minimum noise generation and minimum flow losses and a particularly compact construction is obtained.

Abstract: In a vehicle air conditioning system CO.sub.2 as the refrigerant is compred by an internally controlled swash plate compressor (1) and circulates in a main circuit (2) having at least two heat exchangers (3, 5). An expansion valve (4) subdivides the main circuit (2) into a high and a low pressure part. The capacity control of the swash plate compressor (1) and therefore the air conditioning system takes place by means of a valve (23), which is located in a partial circuit (22) branched from the main circuit (2) by means of a constant choke (21) and which includes the drive chamber (18) of the swash plate compressor (1), so that in the latter it is possible to modify the pressure for adjusting the stroke length of the compressor piston (7). The branching point for the partial circuit (22) is located on an oil separator (20), which is located in the flow direction behind a first heat exchanger (5), so that the swash plate compressor (1) is cooled and is supplied with returned, cooled oil.

Abstract: The seal or pattern between two machine parts has on one of the sealing gap-forming, facing surfaces (5) a plastic layer (1) with closely juxtaposed depressions (8) which have the form of partly cut off voids of an expanded plastic structure. They are formed by the removal of a plastic layer (3) expanded on the machine part, the layer thickness being so uniformly reduced that the voids (4) of the bottom void layer (4) adjacent to the base surface (5) of the machine part are open. This avoids the insulating action of the closed voids of an expanded plastic layer and the latter has a very limited weight, which avoids any risk of the layer being detached or separated due to centrifugal forces. Moreover, in simple manner, a honeycomb-like, open surface structure is obtained, so that there is a labyrinth effect in the sealing gap.