JP2518965Y2 - Variable capacity swash plate compressor - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trunnion pin for maintaining a non-rotating wobble plate that reciprocates by a rasping motion, among parts for converting a rotary motion into a reciprocating motion, which is used for a cooling cycle for an automobile, for example. , A variable capacity swash plate compressor having improved slidability with a guide plate for slidably guiding the trunnion pin.

[0002]

2. Description of the Related Art In a conventional variable displacement swash plate compressor, a drive shaft 11 is rotatably fitted in a crank chamber 10 as shown in FIG. A swash plate 12 is connected so that the inclination angle can be varied, and a wobble plate 13 is slidably attached to the drive swash plate 12. Plural piston rods (not shown) are attached to the wobble plate 13 at equal intervals in the circumferential direction via spherical bearings (not shown), and pistons (not shown) are connected to the other end of the piston rods. As a result, the wobble plate 13 performs a so-called rasping operation to reciprocate in the axial direction by the rotation of the drive swash plate 12, and the piston reciprocates to compress the refrigerant. Wobble plate 13
Is designed to reciprocate in a non-rotating manner. That is, as shown in FIGS.
3, the trunnion pin 15 is connected, and the trunnion pin 15 is inserted in the notch 13a formed in the wobble plate 13 with the outer peripheral surface 15a abutting. Then, the groove 15b in the trunnion pin 15 is formed in the guide plate 1
4 is abutted so as to be slidable along the outer side surface 14a. In the fitting hole 14b formed in the guide plate 14,
A holding bolt 16 for assembling the compressor body is rotatably fitted, and the guide plate 14 is configured so as not to move in the axial direction. Therefore, when the wobble plate 13 reciprocates,
The trunnion pin 15 slides on the guide plate 14 to keep the wobble plate 13 non-rotating (see Japanese Utility Model Laid-Open No. 2-22,674, etc.).

[0003]

[Problems to be solved by the invention] As shown in FIG.
When the trunnion pin 15 slides along the guide plate 14, a load indicated by an arrow F is applied, and due to a manufacturing error of the trunnion pin 15 or the like, the side surface 1 of the concave groove 15b is
5c may have a shape in which the distance becomes narrower toward the opening 15d. In such a case, depending on the positional relationship between the representative point on which the load acts and the center C of the holding bolt 16, it may act on the position shown by arrow G in FIG. In such a case, the side surface 15c of the trunnion pin 15 and the outer surface 14a of the guide plate that slide with each other.
The oil film of the lubricating oil interposed between and becomes thin, and the side surface 15c
The sliding resistance between the outer surface 14a and the outer surface 14a may increase. Further, when the load on the compressor is very large, the temperature of the lubricating oil becomes high, the viscosity is reduced, and the oil film between the side surface 15c of the trunnion pin 15 and the outer surface 14a of the guide plate 14 may be further thinned. is there.

The present invention has been made in view of the above-mentioned problems of the prior art, and it is necessary to secure an oil film on the sliding surface between the trunnion pin and the guide plate to remarkably improve the slidability thereof. To aim.

[0005]

According to the present invention, there is provided a drive swash plate which is variably connected to a rotating drive shaft and whose inclination angle is variable, and a drive swash plate which is slidably attached to the drive swash plate. A wobble plate that reciprocates in the axial direction by rotation, a guide plate that is arranged substantially parallel to the drive shaft so as to be immovable in the axial direction, and is rotatably supported by a holding bolt, and is provided in the notch of the wobble plate. A trunnion pin that has a recessed groove slidably fitted to the outer peripheral surface and the outer surface of the guide plate and that slides along the guide plate when the wobble plate reciprocates to keep the wobble plate non-rotating. In the variable capacity swash plate compressor, the space between the pair of side surfaces in the trough of the trunnion pin is wider toward the opening. That. Further, the present invention is characterized in that an oil groove for holding lubricating oil is formed on at least one of an outer surface of the guide plate and a side surface of the trough of the trunnion pin. It is a plate compressor.

[0006]

In the present invention, since the space between the pair of side surfaces in the groove of the trunnion pin is wider toward the opening, when the load acts on the trunnion pin and the guide plate, this load Due to the positional relationship between the representative point and the center of the holding bolt, the guide plate can be rotated around the holding bolt, and the sliding surface between the side surface of the groove of the trunnion pin and the outer side surface of the guide plate is always a surface. It can be automatically rotated into contact. As a result, the surface pressure of these sliding surfaces can be reduced as compared with the prior art, an oil film can be secured on the sliding surfaces, and their slidability can be significantly improved.

Further, in the present invention, since the oil groove for holding the lubricating oil is formed on at least one of the outer side surface of the guide plate and the side surface of the concave groove of the trunnion pin, the load of the compressor is large. Even if the surface pressure is high, or even if the viscosity of the lubricating oil is low due to high temperature, the lubricating oil can be retained in the oil groove and the lubricating oil can be prevented from flowing out from the sliding surface. Therefore, it is possible to secure an oil film on the sliding surface and significantly improve the slidability thereof. As a result, it is possible to sufficiently secure the oil film even when operating after being left for a long time. Further, it is also possible to discharge the abrasion powder of the guide plate through the oil groove.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below. 1 is a sectional view of a trunnion pin and a guide plate used in a variable displacement swash plate compressor according to a first embodiment of the present invention, and FIGS. 2 and 3 are sectional views of a trunnion pin showing a modified example of the first embodiment. is there. The parts common to the conventional variable displacement swash plate compressor shown in FIGS. 6 to 10 are designated by the same reference numerals. As shown in FIG. 1, in this embodiment, the pair of side surfaces 15c in the concave groove 15b of the trunnion pin 15 are formed in a tapered shape such that the distance between them becomes wider toward the opening 15d. It is not necessary that both of the pair of side surfaces 15c be tapered, and either one of the side surfaces 15c may be tapered. Since the side surface 15c is formed in a tapered shape, when a load is applied to the trunnion pin 15 and the guide plate 14, the guide plate 14 is not moved due to the positional relationship between the load representative point and the center C of the holding bolt 16.
It can be rotated around the holding bolt 16, and the side surface 15c of the trunnion pin 15 and the outer surface 1 of the guide plate 14 can be rotated.
It is possible to rotate in a self-adjusting manner so that the sliding surface with 4a is always in surface contact. As a result, these side surfaces 15c
The surface pressure of the sliding surface between the outer surface 14a and the outer surface 14a can be reduced as compared with the conventional case, and an oil film can be secured on the sliding surface, and the slidability of these can be significantly improved.

A modification of FIG. 2 will be described. In this example, the side surface 15c formed on the flat surface has a taper (gradient) of a / b, and a = 20 to 25 μm and b = 10 mm. These numerical values are ideal numerical values with which the sliding surface between the side surface 15c and the outer surface 14a of the guide plate 14 can be automatically brought into surface contact. However, the range of a differs depending on the layout of various compressors. A modified example of FIG. 3 will be described. In this example, the side surface 15c is formed in an arc shape having a relatively large curvature, and a cutout 15f is formed so that the lubricating oil easily enters the sliding surface between the side surface 15c and the outer surface 14a. The radius of curvature of the side surface 15c is equal to that of the side surface 15c and the outer side surface 14.
It is preferable that the width c of FIG. 3 is such that when it comes into contact with a, the width c is about 10 μm, which is a clearance through which lubricating oil easily enters. In this modification, since the side surface 15c is tapered and the notch 15f is formed, it is possible to further improve the securing of the oil film on the sliding surface. Further, in the modified example of FIG. 3, since the side surface 15c is formed in an arc shape, it can be manufactured at a lower cost than the modified example of FIG.

Next, a second embodiment of the present invention will be described.
FIG. 4 is a perspective view of a trunnion pin and a guide plate used in the variable displacement swash plate compressor according to the second embodiment, and FIG. 5 is a side view of the guide plate showing a modified example of the second embodiment. 6 is a sectional view of a trunnion pin showing a modification of the second embodiment. As shown in FIG. 4, the second
In the embodiment, the oil groove 20 for holding the lubricating oil is formed on the outer side surface 14a of the guide plate 14. The oil groove 20 extends parallel to the axial direction of the guide plate 14. Since the oil groove 20 is formed in this way, even when the load of the compressor is large and the surface pressure is large,
Further, even when the viscosity of the lubricating oil is low due to the high temperature, the lubricating oil can be retained in the oil groove 20, and the side surface 15c
The lubricating oil can be prevented from flowing out from the sliding surface between the outer surface 14a and the outer surface 14a, an oil film can be secured on the sliding surface, and the slidability of these can be significantly improved. As a result, it is possible to sufficiently secure the oil film even when operating after being left for a long time. Further, the abrasion powder of the guide plate 14 can be discharged through the oil groove 20, and the oil groove 20 is formed on a flat surface, which facilitates the production.

The shape of the oil groove 20 is not particularly limited, but as shown in FIG. 5A, the pair of oil grooves 20 may be formed obliquely so as to intersect each other.
It may be formed with a slant as in (b). Also,
It may be formed in an arc shape with a constant radius of curvature as shown in FIG. 5C, or may be formed in a large number of circular shapes that are sequentially connected as shown in FIG. 5D. In the example shown in FIGS. 6A to 6E, the oil groove 20 is formed on the side surface 15c of the trunnion pin 15. Also in this case, similarly to the case described above, the lubricating oil can be prevented from flowing out from the sliding surface between the side surface 15c and the outer surface 14a, and an oil film can be secured on the sliding surface to improve the slidability thereof. It can be significantly improved. Also, the side surface 15c
Tapered surfaces 21 are formed on both ends of the. This allows
The lubricating oil easily enters the sliding surface between the side surface 15c and the outer surface 14a. The oil groove 20 may be formed parallel to the axis of the guide plate 14 as shown in FIG. 6A, or may be formed perpendicularly to the axis as shown in FIG. 6B. In addition, FIG.
Even if the pair of oil grooves 20 intersect each other as shown in FIG. 6C, or if they are formed in an arc shape with a constant radius of curvature as shown in FIG. 6D, they will have a circular shape as shown in FIG. 6E. You may form. As described above, even when the oil groove 20 is formed on the side surface 15c of the trunnion pin 15, the shape of the oil groove 20 can be variously modified and is not limited to any one.

Further, the guide plate 14 shown in FIGS.
The trunnion pin 15 and the trunnion pin 15 may be appropriately combined and used. In the present invention, the oil groove 20 may be formed in at least one of the guide plate 14 and the trunnion pin 15.

[0013]

As described above, in the present invention, since the distance between the pair of side surfaces in the groove of the trunnion pin becomes wider toward the opening, the load acts on the trunnion pin and the guide plate. Then, due to the positional relationship between the load representative point and the center of the holding bolt, the guide plate can rotate around the holding bolt,
The sliding surface between the concave groove of the trunnion pin and the outer surface of the guide plate can be rotated by self-adjustment so that the sliding surface is always in surface contact. As a result, the surface pressure of these sliding surfaces can be reduced as compared with the prior art, an oil film can be secured on the sliding surfaces, and their slidability can be significantly improved. Further, in the present invention, since the oil groove for holding the lubricating oil is formed on at least one of the outer surface of the guide plate and the side surface of the trough of the trunnion pin, the load of the compressor is large and the surface pressure is large. Even if it is large, even if the viscosity of the lubricating oil is low due to high temperature, the lubricating oil can be retained in the oil groove, and the lubricating oil can be prevented from flowing out from the sliding surface. It is possible to secure an oil film on the moving surface and significantly improve the slidability thereof. As a result, it is possible to sufficiently secure the oil film even when operating after being left for a long time.

[Brief description of drawings]

FIG. 1 is a sectional view of a trunnion pin and a guide plate used in a variable displacement swash plate compressor according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a trunnion pin showing a modification of the first embodiment.

FIG. 3 is a sectional view of a trunnion pin showing another modification of the first embodiment.

FIG. 4 is a perspective view of a trunnion pin and a guide plate used in a variable displacement swash plate compressor according to a second embodiment of the present invention.

FIG. 5 is a side view of a guide plate showing a modification of the second embodiment.

FIG. 6 is a sectional view of a trunnion pin showing a modification of the second embodiment.

FIG. 7 is a sectional view of a main part of a conventional variable displacement swash plate compressor.

8 is a cross-sectional view taken along line 8-8 of FIG.

FIG. 9 is an exploded perspective view of a conventional wobble plate, a trunnion pin, and a guide plate.

FIG. 10 is a sectional view of a conventional trunnion pin and a guide plate.

[Explanation of symbols]

11 ... Drive shaft, 12 ... Drive swash plate, 13 ... Wobble plate, 14 ... Guide plate, 14a ... Outer surface, 15 ... Trunnion pin, 15b ... Recessed groove, 15c ... Side surface, 20 ... Oil groove.

Claims (2)

(57) [Scope of utility model registration request] 1. A drive swash plate (12) variably connected to a rotating drive shaft (11) with a variable inclination angle, and the drive swash plate (12).
A wobble plate (13) slidably attached to the drive shaft and reciprocating in the axial direction by rotation of the drive swash plate (12);
Provided in the guide plate (14) which is arranged so as to be immovable in the axial direction substantially parallel to (11) and is rotatably supported by the holding bolt (16), and the notch (13a) of the wobble plate (13). Outer peripheral surface
(15a) and the outer surface (14a) of the guide plate (14) has a groove (15b) slidably fitted therein, and slides on the guide plate (14) when the wobble plate (13) reciprocates. Wobble board
In a variable displacement swash plate compressor including a trunnion pin (15) that keeps (13) non-rotating, a space between a pair of side surfaces (15c) in a groove (15b) of the trunnion pin (15) is defined by an opening ( A variable capacity swash plate compressor characterized in that it is formed so that it becomes wider toward 15d). 2. The outer surface (14a) of the guide plate (14)
And the side surface of the groove (15b) of the trunnion pin (15)
The variable capacity swash plate compressor according to claim 1, wherein an oil groove (20) for holding a lubricating oil is formed on at least one of (15c).