WO2012159800A1

WO2012159800A1 - Compressor with swash plate

Info

Publication number: WO2012159800A1
Application number: PCT/EP2012/055577
Authority: WO
Inventors: Oliver Tschismar
Original assignee: Robert Bosch Gmbh
Priority date: 2011-05-23
Filing date: 2012-03-29
Publication date: 2012-11-29
Also published as: CN103547802A; DE102011076251A1; US20140147317A1

Abstract

A compressor has a swash plate which comprises a friction plate and an inner plate. The friction plate is arranged radially on the outside around the inner plate. The friction plate and the inner plate are connected to one another in a material-to-material manner.

Description

description

title

Compressor with swash plate

The invention relates to a compressor with a swash plate according to the preamble of patent claim 1 and to a method for producing a swash plate of a compressor according to the preamble of patent claim 10.

State of the art

Swash plate compressors are known in the art. Such a compressor is described for example in DE 101 60 555 A1. Swash plate compressors are used, for example, in air conditioning systems as air conditioning compressors for compressing a refrigerant.

In the operation of a compressor with a swash plate, friction occurs between the swash plate and piston shoes of pistons of the compressor. To optimize the friction torque occurring, it is known to form the swash plate made of suitable materials or coated with suitable materials. However, this increases material and manufacturing costs of the swash plate.

Disclosure of the invention

The object of the present invention is to provide an improved compressor with a swash plate. This object is achieved by a compressor having the features of patent claim 1. It is a further object of the present invention to provide an improved method for producing a rope specify a compressor disc. This object is achieved by a method having the features of claim 10. Preferred developments are specified in the dependent claims. A compressor according to the invention has a swash plate which has a

Includes friction disc and an inner disc. In this case, the friction disc is arranged radially outwardly around the inner disc. In addition, the friction disc and the inner disc are firmly bonded together. Advantageously, a compressor with such a swash plate is cheaper to produce than a conventional compressor with a conventional swash plate.

Preferably, the inner disc is made of steel. Advantageously, steel is an inexpensive and robust material. In one embodiment of the compressor, the friction disc is made of steel.

Advantageously, the friction disk can then also be produced simply and inexpensively.

In another embodiment of the compressor, the friction disc is made of a copper alloy. Advantageously, by the use of a

Copper alloy for the friction disc optimizes a friction torque occurring between the friction disc and the piston shoes of the compressor.

Particularly preferably, the friction disk is coated. Advantageously, the surface of the friction disc can then be formed so that during operation of the

Compressor between the friction and piston shoes of the compressor occurring friction torque is optimized.

In one embodiment, the friction disc is coated with PTFE (polytetrafluoroethylene). Advantageously, PTFE is a suitable and commercially available coating agent.

In one embodiment of the compressor, the inner disk has a frustoconical outer circumference and the friction disk has a frusto-conical inner circumference. Advantageously, this increases the contact surface between the inner disc and the friction disc, which allows a robust connection between inner disc and friction disc.

In another embodiment of the compressor, the inner disc has a stepped outer circumference. Advantageously, the inner disc and the friction disc then abut one another in a radial and in an axial region, which likewise results in a large contact surface between inner disc and friction disc, which enables a robust connection between inner disc and friction disc.

In one embodiment of the compressor, this is an air conditioning compressor. Advantageously, the compressor can then be used in an air conditioner for compressing a refrigerant. An inventive method for producing a swash plate of a

The compressor includes steps of providing an inner disk, providing a friction disk, disposing the friction disk on an outer periphery of the inner disk, and bonding the friction disk to the inner disk. Advantageously, this method enables a simple and cost-effective production of the swash plate of the compressor.

In one embodiment of the method, the friction disc and the inner disc are joined together by friction welding. Advantageously, this method results in a durable and robust cohesive connection between the friction disk and the inner disk.

In another embodiment of the method, the friction disk and the inner disk are joined together by magnetic pulse welding. Advantageously, this also results in a cohesive connection of friction disc and inner disc.

In a further embodiment of the method, the friction disk and the inner disk are connected to each other by spot welding. Advantageously, this represents a particularly simple variant of the method. The invention will now be explained in more detail with reference to the accompanying figures. Showing:

Figure 1 is a schematic representation of a section through a compressor according to a first embodiment; and

Figure 2 is a schematic representation of a section through a compressor according to a second embodiment. FIG. 1 shows, in a slightly schematic representation, a section through a

Compressor 10 according to a first embodiment. The compressor 10 may be, for example, an air conditioning compressor of an air conditioner and serve to compress a refrigerant of the air conditioner. However, the compressor 10 may also be any other compressor.

The compressor 10 has a cylinder block 1 1 and an attached to the cylinder block 11 front housing 12. The front housing 12 and the cylinder block 11 together form a crankcase 13 of the air conditioning compressor 10. The cylinder block 11 has one or more cylinders, in each of which a

Piston 14 is movably arranged. In FIG. 1, only one cylinder with a piston 14 arranged therein is visible. Each of the cylinders, not shown in detail in FIG. 1, has inlet and outlet valves. The inlet valves are intended to supply a medium to be compressed to the respective cylinder. The medium supplied to the cylinder is compressed by means of the piston 14 arranged in the cylinder and subsequently discharged from the cylinder via the outlet valve.

In the crankcase 13 formed by the cylinder block 11 and the front housing 12, a drive shaft 15 is disposed. The drive shaft 15 is rotatable relative to the crankcase 13 about its longitudinal axis. A support plate 16 is fixed on the drive shaft 15 to perform a rotational movement about the longitudinal axis of the drive shaft 15 together with the drive shaft 15. Further, a swash plate 20 is disposed in the crankcase 13. The swash plate 20 is substantially circular disk-shaped and has a ne central through hole through which the drive shaft 15 extends. The central bore of the swash plate 20 is dimensioned so that the swash plate does not have to be oriented exactly perpendicular to the longitudinal direction of the drive shaft 15, but can be inclined relative to the drive shaft 15.

The swash plate 20 includes an inner disc 40 and a friction disc 30. The friction disc 30 may also be referred to as an annular disc. The inner disc 40 may also be referred to as a sleeve or socket. The inner disc 40 forms a radially inner portion of the swash plate 20 and has the central bore through which the drive shaft 15 extends. The friction disk 30 forms a radially outer region of the swash plate 20 and is arranged radially on the outside of the inner disk 40. The friction disk 30 and the inner disk 40 of the swash plate 20 are connected to one another in a material-locking manner. The inner disc 40 also has a counterweight portion 42 which is radially opposed to the hinge 17 and is supported on the support plate 16.

The inner disc 40 of the swash plate 20 is connected via a hinge 17 with the support plate 16. Via the support plate 16 and the hinge 17, a rotation of the drive shaft 15 about the longitudinal axis of the drive shaft 15 are transmitted to the swash plate 20, whereby the swash plate 20 is rotated in a rotation about the longitudinal axis of the drive shaft 15. A compression spring 18 is wound around the drive shaft 15 between the support plate 16 and the swash plate 20 and biases the swash plate 20 in the direction of the cylinder block 11. By shifting the swash plate 20 in the direction of the cylinder block 11, the inclination of the swash plate 20 can be reduced.

The friction disk 30 of the swash plate 20 is coupled to the piston 14 via a pair of piston shoes 21. Accordingly, the friction plate 30 is coupled via other piston shoes 21 also to all other pistons 14 of the compressor 10. The friction plate 30 is slidably disposed between the piston shoes 21. A piston shoe 21 of each pair of piston shoes 21 lies on the front side, the other piston shoe 21 of each pair of piston shoes 21 on the rear side. side of the friction disc 30 of the swash plate 20 at. A rotational movement of the swash plate 20 about the longitudinal axis of the drive shaft 15 is translated via the friction plate 30 and the piston shoes 21 in a periodic longitudinal movement of the piston 14 in the cylinder of the cylinder block 11. By changing the inclination of the swash plate 20 with respect to the drive shaft 15, the stroke of the piston 14 can be changed.

In the air conditioning compressor 10 of the first embodiment shown in FIG. 1, the inner disk 40 of the swash plate 20 has a frusto-conical outer periphery 41. The friction disk 30 of the swash plate 20 has a frusto-conical inner circumference 31. The outer periphery 41 of the inner disc 40 is thus not oriented perpendicular to the disc plane of the swash plate 20, but inclined relative to a vertical orientation. Accordingly, the inner periphery 31 of the friction disk 30 is not oriented perpendicular to the disk plane of the swash plate 20, but with respect to a vertical

Orientation inclined. The frusto-conical outer circumference 41 of the inner disk 40 and the frusto-conical inner periphery 31 of the friction disk 30 are dimensioned so that the friction disk 30 can be arranged around the inner disk 40 so that the frusto-conical inner periphery 31 of the friction disk 30 flat against the frustoconical outer circumference 41 inner disk 40 abuts.

The frusto-conical outer circumference 41 of the inner disk 40 and the frusto-conical inner circumference 31 of the friction disk 30 are connected to one another in a material-locking manner. Preferably, the outer periphery 41 of the inner disc 40 and the inner periphery 31 of the friction disc 30 are connected to each other by a welding process. Particularly preferably, the inner disk 40 and the friction disk 30 are joined together by friction welding. However, it is also possible to connect the inner disk 40 and the friction disk 30 by magnetic pulse welding or by spot welding.

The inner disk 40 may be made of steel, for example. The friction plate 30 of the swash plate 20 may for example consist of a copper alloy. Advantageously, by using a copper alloy for the friction disk 30 of the swash plate 20, the friction between the friction disk 30 and the piston shoes 21 is optimized. Alternatively, the friction plate 30 of the Swash plate 20, however, made of the same material as the inner disc 40, for example made of steel. In this case, the friction disk 30 of the swash plate 20 is preferably coated with a material which ensures optimized friction between the friction disk 30 and the piston shoes 21. The friction disk 30 of the swash plate 20 may be coated, for example, with a copper alloy. Alternatively, the friction disk 30 may also be coated with PTFE (polytetrafluoroethylene, also known by the trade name Teflon).

Figure 2 shows a slightly schematic representation of a section through a compressor 110 according to a second embodiment. The second compressor 110 may also be an air compressor for compressing a coolant in an air conditioner. However, the compressor 110 of the second embodiment may be any other type of compressor. The structure of the compressor 110 according to the second embodiment shown in Figure 2 largely corresponds to that of the compressor 10 shown in Figure 1 of the first embodiment. For identical or equivalent components, therefore, the same reference numerals have been used in Figures 1 and 2. These components as well as the general operation of the compressor 110 will not be explained again below.

In contrast to the compressor 10 of FIG. 1, the compressor 110 of FIG. 2 has an altered swash plate 120. The swash plate 120 includes an inner disc 140 and a friction disc 130. The friction disc 130 is formed substantially annular and arranged radially circumferentially around the inner disc 140.

The inner disk 140 of the swash plate 120 has a stepped outer periphery 141. The inner disc 140 thus has in the axial direction a first portion with a first diameter and a second portion with a second diameter which is larger than the first diameter. Between the two sections extending in the radial direction extending vertical step. The friction disk 130 of the swash plate 120 has a cylindrical inner periphery 131 whose diameter corresponds approximately to the diameter of the first portion of the outer periphery 141 of the inner disk 140. The friction disk 130 is arranged around the inner disk 140 such that the cylindrical The inner circumference 131 of the friction disc 130 abuts flat against the first portion of the stepped outer periphery 141 of the inner disc 140, that is to say on the portion of the stepped outer periphery 141 which has the smaller diameter. In addition, the friction plate 130 of the swash plate 120 is supported on the step in the stepped outer periphery 141 of the inner disc 140 from. Thus, an axial contact area between the cylindrical inner periphery 131 of the friction disk 130 and the first portion of the stepped outer periphery 141 of the inner disk 140 and a radial contact area between a front side of the friction disk 130 and the step of the stepped outer periphery 141 of the inner disk 140.

Again, the friction disc 130 and the inner disc 140 are firmly bonded together. The friction disk 130 and the inner disk 140 may be joined together by friction welding, magnetic pulse welding or spot welding. Also a use of another

Welding process is possible.

The friction plate 130 and the inner plate 140 of the swash plate 120 may be made of the same material or different materials. For example, the inner disk 140 may be made of steel. The friction disc

130 may for example consist of a copper alloy or coated with a copper alloy steel. However, the friction disc 130 may be made of another material or coated with another material.

Claims

Compressor (10, 1 10)

with a swash plate (20, 120),

characterized in that

the swash plate (20, 120) comprises a friction disk (30, 130) and an inner disk (40, 140),

wherein the friction disc (30, 130) is disposed radially outwardly around the inner disc (40, 140),

wherein the friction disc (30, 130) and the inner disc (40, 140) are materially interconnected.

A compressor (10, 10) according to claim 1,

wherein the inner disc (40, 140) is made of steel.

Compressor (10, 1 10) according to one of claims 1 or 2,

wherein the friction disc (30, 130) consists of steel.

Compressor (10, 1 10) according to one of claims 1 or 2,

wherein the friction disc (30, 130) is made of a copper alloy.

Compressor (10, 1 10) according to one of claims 3 or 4,

wherein the friction disc (30, 130) is coated.

A compressor (10, 110) according to claim 5,

wherein the friction disc (30, 130) is coated with PTFE.

A compressor (10) according to any one of the preceding claims, wherein the inner disc (40) has a frusto-conical outer periphery (41) and the friction disc (30) has a frusto-conical inner periphery (31).

8. The compressor (1 10) according to any one of claims 1 to 6, wherein the inner disc (140) has a stepped outer periphery (141).

9. compressor (10, 110) according to one of the preceding claims,

wherein the compressor (10, 110) is an air conditioning compressor.

10. A method for producing a swash plate (20, 120) of a compressor (10, 110) comprising the following steps:

- Providing an inner disc (40, 140);

- Providing a friction disc (30, 130);

- placing the friction disc (30, 130) on an outer periphery (41, 141) of the inner disc (40, 140);

- Bonded connection of the friction disc (30, 130) with the inner disc (40, 140).

1 1. A method according to claim 10,

wherein the friction disc (30, 130) and the inner disc (40, 140) are joined together by friction welding.

12. The method according to claim 10,

wherein the friction disc (30, 130) and the inner disc (40, 140) are interconnected by magnetic pulse welding.

13. The method according to claim 10,

wherein the friction disc (30, 130) and the inner disc (40, 140) are joined together by spot welding.