JPH0433422Y2 - - Google Patents

Description

[Detailed Description of the Invention] Purpose of the Invention (Field of Industrial Application) The present invention relates to a thrust race mounting structure in a thrust bearing of an oscillating compressor used, for example, in a vehicle air conditioner.

(Prior art) Conventionally, as an oscillating compressor, for example, the
A structure as shown in Japanese Patent No. 22210 is known. In this compressor, a large number of needles 18 held by a retainer 19 as shown in FIG.
A fitting ring portion 21a having an L-shaped cross section is provided on the inner circumferential edge of the thrust race 21 that supports the rotor 10, while the fitting ring portion 21a is fitted onto the vertical surface 10b of the wedge-shaped rotor 10. An annular fitting groove 10d was carved therein.

(Problems to be Solved by the Invention) However, in this oscillating compressor, since the wedge-shaped rotor 10 is provided with the fitting groove 10d, the vertical surface 10b of the wedge-shaped rotor 10 is There is a problem in that the wall thickness t becomes thin locally and over the entire circumference, and as a result, the strength of the rotor 10 decreases. Furthermore, the wall thickness t of the rotor 10b must be increased, which increases the size of the rotor 10, which in turn increases the weight of the compressor.

The present invention aims to provide a thrust race mounting structure for a thrust bearing of an oscillating compressor, which can suppress local strength reduction of rotating side members such as a wedge-shaped rotor and reduce the diameter and weight of the compressor. I'm taking it as a challenge.

Structure of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention improves the gap between the inner wall surface of the front housing and the vertical surface of the wedge-shaped rotor, and/or the inclined surface of the wedge-shaped rotor. A thrust compressor of an oscillating compressor in which a large number of needles held by a retainer are interposed between relatively moving members such as a gap between the rear surface of the plannet plate and the rear surface of the plannet plate, and thin plate annular thrust races are arranged on both the front and back sides of the needles. In the bearing, among the relatively moving members, the annular fitting step portion formed on the non-rotating side member such as the inner wall surface of the front housing and/or the back surface of the plannet plate has a fitting step portion located on the non-rotating side member side. A retainer receiving ring portion formed with an L-shaped cross section is fitted onto the inner peripheral edge of the thrust race, and the outer peripheral edge of the thrust race located on the side of a rotating member such as a wedge-shaped rotor has an L-shaped cross section.
A method is adopted in which a fitting ring portion is formed by forming the ring portion into a letter shape, and the ring portion is fitted onto a shoulder portion on the outer circumferential surface of a rotating member such as a wedge-shaped rotor.

(Function) When the thrust race located on the side of a rotating member such as a wedge-shaped rotor has a fitting ring formed on its outer periphery fitted to a shoulder on the outer circumferential surface of the rotating member,
Its radial movement is prevented. Further, the thrust plate located on the side of the non-rotating side member such as the front housing and/or the plannet plate has a retainer receiving ring portion formed on its inner peripheral edge that is fitted into the fitting stepped portion of the non-rotating side member. Then, its radial movement is prevented. Furthermore, in the latter thrust plate, since the contact area between the receiving ring part and the fitting step part is large, even if a force trying to move in the radial direction acts on the thrust race, the amount of contact per unit area is large. Contact pressure is reduced, and wear of the contact portion is suppressed. On the other hand, since there is no need for a fitting groove for attaching the thrust race on the vertical and/or inclined surfaces of the rotating side member such as the wedge-shaped rotor, manufacturing is facilitated, and the compression reaction force from the piston is reduced. Even if a load is applied to the rotating member, the load is not concentrated on a specific location but is distributed, so there is no reduction in the strength of the rotating member, and furthermore, the rotating member can be made smaller.

(Example) Below, an example embodying the present invention is shown in Figure 1~
This will be explained based on FIG.

As shown in FIG. 1, a cylinder block 2 having a plurality of bores 2a is fitted into a cylindrical housing 1, and a suction chamber 4 and a discharge chamber are connected to the right end surface of the housing 1 via a valve plate 3. A rear housing 6 having a chamber 5 is fitted therein. Further, a front housing 7 as a non-rotating side member is joined to the left end surface of the housing 1.
A drive shaft 9 is supported through a radial needle bearing 8 at the center of the shaft. A wedge-shaped rotor 10 as a rotating member is fitted to the inner end of the drive shaft 9, and a plannet plate 11 as a non-rotating member is attached to the inclined surface 10a side of the rotor 10. A bevel gear 12 is fixed to the center of the plannet plate 11, and a bevel gear 14 that meshes with the bevel gear 12 through a steel ball 13 is fixed to the center hole of the cylinder block 2. The plannet plate 11 is rotatably locked by the steel balls 13, and is prevented from moving in the rotational direction by the meshing of a pair of bevel gears 12 and 14.

The piston 15 housed in the bore 2a and the planet plate 11 are connected by a rod 16.

Therefore, when the wedge-shaped rotor 10 is rotated, since the plannet plate 11 is prevented from rotating, the rotation of the inclined surface 10a of the wedge-shaped rotor 10 causes the plate 11 to move in the front-back direction (as shown in FIG. 1). This causes the piston 15 to reciprocate within the bore 2a via the rod 16.

The annular fitting step 7b formed on the inner wall surface 7a of the front housing 7 has a cross section L on the inner peripheral edge of the thin annular thrust race 17.
A retainer receiving ring portion 17a formed by bending into a letter shape is fitted. Further, the inner peripheral edge of a retainer 19 that holds a large number of needles 18 is fitted into the retainer receiving ring portion 17a so as to be immovable in the radial direction but slidable in the circumferential direction. Furthermore, another thrust race 20 is disposed on the left vertical surface 10b of the wedge-shaped rotor 10 facing the thrust race 17, and a fitting formed by bending the outer peripheral edge of the thrust race 20 into an L-shape in cross section is provided. The combined ring portion 20a is fitted onto the outer peripheral surface shoulder portion 10c of the wedge-shaped rotor 10 so as not to be movable in the radial direction.

Moreover, as shown in FIGS. 3 and 5, the wedge-shaped rotor 1
A thrust bearing similar to the thrust bearing made of the thrust races 17, 20, needle 18, retainer 19, etc. described above is also interposed between the inclined surface 10a of the plane plate 10 and the back surface 11a of the plannet plate 11. , these are given the same reference numerals and their explanation will be omitted.

Next, the operation of the oscillating compressor configured as described above will be explained.

Now, when the drive shaft 9 is rotated, the wedge-shaped rotor 10
is rotated, which causes the pair of bevel gears 12 and 14 to rotate.
Planet plate 1 whose rotation is prevented by
1 swings back and forth due to the rotation of the inclined surface 10a of the wedge-shaped rotor 10. The movement of the planet plate 11 causes the piston 15 to reciprocate within the bore 2a via the rod 16, thereby performing a compression operation.

At this time, the retainer receiving ring portion 17a of the thrust race 17 is connected to the front housing 7 and the fitting step portions 7b, 1 of the plannet plate 11.
1b, and the thrust race 20
Since the fitting ring part 20a is fitted to the outer peripheral surface shoulder part 10c of the wedge-shaped rotor 10, movement in the radial direction is prevented, and the fitting step part 7b and the retainer receiving ring part 17a are prevented from moving in the radial direction. The contact area between the fitting ring portion 20a and the outer circumferential shoulder portion 10c of the wedge-shaped rotor 10 increases, and as a result, the contact area per unit area when the thrust race receives a force that tends to move in the radial direction increases. The pressure is reduced and wear of the contact parts is suppressed.

Further, a fitting ring portion 20a is formed on the outer peripheral edge of the thrust race 20, and the ring portion 20a is fitted to the outer peripheral surface shoulder portion 10c of the wedge-shaped rotor 10, so that the vertical surface 10b of the wedge-shaped rotor 10 It is possible to prevent the wall thickness from becoming locally thinner, and therefore the wedge-shaped rotor 10 can be made smaller and lighter.

Note that the present invention can also be embodied as follows.

Although not shown, the wedge-shaped rotor 10 is formed by a rotating body fixed to the drive shaft 9 and a rotating swash plate that is pivoted to the rotating body so that the inclination angle in the front and rear direction can be changed. In a variable angle swing type compressor in which the installed plannet plate 11 swings back and forth to change the stroke of the piston 15 and the compression capacity is automatically adjusted, the front housing, the rotating body, and the rotating oblique To be implemented on the thrust bearing interposed between the plate and the plannet plate.

In addition, in this compressor in which the rotary body is replaced with a drive pin fixed to the drive shaft 9, a thrust race of a thrust bearing interposed only at one location between the rotating swash plate and the plannet plate is installed. To materialize as a structure.

Effects of the Invention As detailed above, the present invention forms a fitting ring portion with an L-shaped cross section on the outer peripheral edge of the thrust race on the rotating side member side such as a wedge-shaped rotor. Since it fits into the shoulder on the outer peripheral surface of the rotating side member, there is no need to carve a fitting groove for attaching the thrust race on the vertical and/or inclined surface of the rotating side member, unlike conventional methods. Since it is possible to prevent local strength reductions in rotating side members such as the wedge-shaped rotor, it is possible to downsize the rotating side members and reduce the overall weight of the compressor, as well as simplify manufacturing and reduce costs. There is an effect that can be achieved.

In addition, since the fitting ring formed on the outer peripheral edge of the thrust race fits with the outer peripheral surface of the wedge-shaped rotor, which has a large contact area, even if the bending length of the fitting ring is short, no additional The contact pressure per unit area of the centrifugal force that attempts to move the thrust race in the radial direction due to the rotation of the wedge-shaped rotor is small, and movement in the radial direction can be reliably prevented. .

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of the central part of an oscillating compressor showing an embodiment of the present invention, Figs. 2 and 3 are enlarged cross-sectional views of the vicinity of the thrust bearing, and Figs. 4 and 5. is an enlarged exploded perspective view of the thrust bearing.
FIG. 6 is an exploded perspective view showing a conventional thrust bearing. a front housing 7 as a non-rotating side member;
Inner wall surface 7a, fitting step portions 7b and 11b, wedge-shaped rotor 10 as a rotating side member, inclined surface 10a, vertical surface 10b, outer peripheral surface shoulder portion 10c, plannet plate 11 as a non-rotating side member, and back surface 11a. , thrust races 17 and 20, retainer receiving rib portion 17a, fitting ring portions 20a and 20a, needle 18, and retainer 19.

Claims (1)

[Claims for Utility Model Registration] Between relatively moving members such as the gap between the inner wall surface of the front housing and the vertical surface of the wedge-shaped rotor, and/or the gap between the inclined surface of the wedge-shaped rotor and the back surface of the planet plate. In a thrust bearing for an oscillating compressor, in which a large number of needles held by a retainer are interposed, and thin plate annular thrust races are arranged on both the front and rear sides of the needles, the inner wall surface of the front housing is one of the relatively moving members. And/or the annular fitting step formed on the non-rotating side member such as the back surface of the plannet plate has an L-shaped cross section formed on the inner peripheral edge of the thrust race located on the non-rotating side member side. At the same time, the outer peripheral edge of the thrust race located on the rotating side member side such as a wedge-shaped rotor is formed to have an L-shaped cross section to form a fitting ring part, and the ring part is fitted with the retainer receiving ring part. A thrust race mounting structure in a thrust bearing of an oscillating compressor, in which the part is fitted to the shoulder part of the outer peripheral surface of a rotating member such as a wedge-shaped rotor.