JPH087098Y2 - Variable capacity swash plate compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial field of application) The present invention relates to an improvement in a variable displacement swash plate compressor, and more particularly, to a rotary motion of a drive shaft connected to a piston to a swing motion of the piston. Socket plate for converting,
It is designed to smoothly swing.

(Prior Art) As a compressor used in a recent automobile air conditioner, a variable capacity swash plate compressor as disclosed in Japanese Patent Publication No. 63-10311 is known.

As shown in FIG. 4, the variable displacement swash plate compressor 3 changes the volume of the compression chamber in the cylinder 25 in accordance with the suction pressure of the refrigerant that returns to the compressor 3 to change the amount of refrigerant discharged from the compressor 3. The suction pressure of the compressor 3 is adjusted to be constant.

When the suction pressure is made constant in this way, the refrigerant pressure at the outlet of the evaporator becomes constant to some extent (that is, the evaporation pressure of the refrigerant at the evaporator), and it is possible to avoid freezing of the evaporator at the time of so-called low load,
Since the compressor 3 develops the discharge amount according to the heat load, it is possible to reduce the conventional ON / OFF of the compressor by the magnet clutch.

Therefore, the sudden temperature change of the air blown into the vehicle compartment and the abrupt torque change of the engine rotation due to the turning on and off of the compressor are eliminated, and the comfort during driving can be improved.

The variable capacity swash plate compressor 3 has a drive shaft 11 which is rotationally driven by an engine via a belt, a pulley 2 and a magnet clutch 2a. A drive rod 11a is provided on the drive shaft 11 so as to project in a direction perpendicular to the drive shaft 11 so as to rotate together with the drive shaft 11 in the clutch chamber 12.

A drive swash plate 13 is connected to the drive rod 11a so that the drive swash plate 13 tilts with respect to the drive shaft 11 and can swing about the pin 11b. As a result, the rotational force of the drive shaft 11 is transmitted to the drive swash plate 13 via the drive rod 11a and the pin 11b. The drive swash plate 13 has thrust bearings 14
Also, a non-rotating socket plate 16 is slidably mounted via a radial bearing 15.

The socket plate 16 has a guide ball 50 slidably connected to a guide pin 18 fixed to a casing 17 of the crank chamber 12, and the guide ball 50 prevents rotation, while Reciprocating motion is allowed. Plural piston rods 22 are attached to the socket plate 16 via spherical bearings 22a at equal intervals in the circumferential direction, and the piston 23 is connected to the other end of the piston rods 22 via spherical bearings 22b. ing.

Then, by rotating the drive swash plate 13, the socket plate
The 16 moves so as to reciprocate in the axial direction by performing a so-called rasping operation, whereby the piston 23 is reciprocated via the piston rod 22. A top surface side portion of the piston 23 of the cylinder 25 into which the piston 23 is inserted is a compression chamber, and a rear side portion thereof communicates with the crank chamber 12.

Further, as is well known, the variable capacity swash plate compressor 3
Has a control valve (not shown). This control valve keeps the suction pressure constant,
It is for controlling the pressure in the crank chamber 12. By this control, the inclination angle of the drive swash plate 13 with respect to the drive shaft 11 changes, and the reciprocating stroke of the piston 23 changes.

FIGS. 5 and 7 show an enlarged view of the attachment state of the socket plate 16 and the guide pin 18 of the variable displacement swash plate type compressor 3 as described above. Here, FIG.
The disassembled perspective view of the said part is shown, and FIG. 7 has shown the longitudinal cross-sectional view after the connection of the same part.

As shown in the figure, the guide pin 18 has the guide ball 50 having a fitting hole 51 and a spherical outer peripheral surface.
It is slidably connected to the pin 18. Furthermore,
A pair of shoes 19, 19 are attached between the guide ball 50 and the socket plate 16. The inner peripheral surface of each shoe 19 is formed in a spherical shape that contacts the outer peripheral surface of the guide ball 50, and the outer peripheral surface is formed in a spherical shape that contacts the spherical inner surface 16b formed at one end 16a of the socket plate 16. ing.

Further, as shown in FIG. 6, there is also a variable capacity swash plate compressor 3 in which the socket plate 16 is attached to the guide bar 60 without using the guide ball 50 and the shoe 19.

The socket plate 16 has a trunnion pin 61 slidably connected to a guide bar 60 fixed to the casing 17, and the trunnion pin 61 prevents rotation, while allowing reciprocal movement in the axial direction. Has been done. The trunnion pin 61 has an outer peripheral surface that contacts the inner peripheral surface 16b of the socket plate 16, and has a flat side surface 63a.
A concave groove 63 having is formed. The trunnion pin 61 is connected to the one end 16a of the socket plate 16 via a connecting pin 62.

(Problems to be Solved by the Invention) In such a conventional variable displacement compressor 3, as shown in FIG. 7, a fitting hole 51 of the guide ball 50 is provided.
The inner peripheral surface of the guide pin 18 and the outer peripheral surface of the guide pin 18 are designed to be parallel to each other with a predetermined clearance, and the reciprocating motion of the guide ball 50 along the guide pin 8 is allowed by the clearance. ing.

However, since the socket plate 16 constantly swings around the pin 11b as the drive shaft 11 rotates, a force that prevents the socket plate 16 from rotating is constantly applied to the guide ball 50 via the shoe 19. Will be done.

Therefore, as shown in FIG. 8, the edge portion of the fitting hole 51 of the guide ball 50 or the end portion of the shoe 19 collides with or abuts against the guide pin 18 due to the presence of the clearance, so that the line contact may be prevented. The frictional state may damage the outer peripheral surface of the guide pin 18 or cause abnormal wear. If such scratches or abnormal wear occur, the guide ball
There is a possibility that the 50 does not slide smoothly along the guide pin 18, and thus the smooth swinging motion of the socket plate 16 cannot be achieved.

Even in the socket plate 16 having the trunnion pin 61 shown in FIG. 6, the side surface 63a of the groove 63 and the outer peripheral surface of the guide bar 60 are formed into a flat surface, and a clearance is provided between them. Therefore, the above-mentioned drawback cannot be remedied.

The present invention has been made in order to solve the problems associated with the above-mentioned conventional techniques, and provides a variable capacity swash plate compressor that can smoothly swing the socket plate and improve durability. To aim.

[Means for Solving the Problem] (Means for Solving the Problems) In order to achieve the above object, the present invention provides a cylinder with a plurality of pistons reciprocally movable, and a drive shaft for transmitting a driving force to the pistons. A drive swash plate having a variable inclination angle is provided on the drive swash plate, and a non-rotating socket plate to which the piston is coupled is swingably attached to the drive swash plate by the drive swash plate. A variable capacity swash plate compressor comprising a slide member that swingably supports a socket plate, and the socket plate engaged through an engagement member slidably connected to the slide member. A variable capacity swash plate compressor, wherein a sliding surface of the composite member with respect to the slide member is formed in a circular arc shape having a convex shape with respect to the slide member. .

(Operation) In the variable displacement swash plate compressor configured as described above, the clearance between the sliding surfaces of the engaging member and the sliding member gradually increases toward the end of the sliding surface of the engaging member. Grows to.

Then, as the inclination angle of the socket plate with respect to the drive shaft changes, the clearance is maintained even when the engagement member is inclined with respect to the slide member. Therefore, the outer peripheral surface of the slide member is not damaged, and partial abnormal wear does not occur.

Therefore, since the engaging member slides smoothly along the slide member, the swinging motion of the socket plate becomes smooth.

Moreover, since the clearance is maintained, the lubricating oil is easily supplied between the sliding surfaces of the engaging member and the sliding member, so that the oil lubricity of both is improved and the durability of the compressor is improved. become.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

1 and 2 are cross-sectional views of a main part showing a connecting portion between a socket plate and a guide pin of a variable displacement swash plate compressor according to an embodiment of the present invention, which are common to the members shown in FIGS. 4 to 8. The same reference numerals are given to the members, and the description thereof is partially omitted.

The socket plate 16 of this embodiment is a guide ball slidably connected to a guide pin 18 (corresponding to a slide member) fixed to a casing 17 of the crank chamber 12.
30 (corresponding to the engaging member), this guide ball 30
While rotation is prevented by this, reciprocation in the axial direction is allowed.

The guide ball 30 has a fitting hole 31 slidably fitted to the guide pin 18 along the central axis thereof,
A spherical outer peripheral surface is formed. This guide ball
Between the 30 and the socket plate 16, a pair of shoes 32,
32 is installed. The inner peripheral surface of each shoe 32 is formed in a spherical shape that contacts the outer peripheral surface of the guide ball 30, and the outer peripheral surface is formed in a spherical shape that contacts the spherical inner surface 16b formed at one end 16a of the socket plate 16. ing.

In particular, as shown in FIG. 1, the fitting hole of the guide ball 30
An inner peripheral surface (sliding surface) 31a of 31 is formed in a convex arc-shaped cross section with respect to the guide pin 18. Therefore, in the state shown in FIG. 1, the clearance between the inner peripheral surface 31a and the outer peripheral surface of the guide pin 18 gradually increases toward the edge of the fitting hole 31. Further, both ends of each shoe 32 are also formed in an arc shape that is continuous with the arc shape of the inner peripheral surface 31a.

When the variable displacement swash plate compressor 3 having the above configuration is driven, the drive swash plate 13 rotates with the rotation of the drive shaft 11, and the drive swash plate 13 is inclined with respect to the drive shaft 11.
Non-rotating socket plate 16 due to rotation of drive swash plate 13
Will oscillate around the pin 11b. This swinging motion causes the piston 23 to reciprocate in the cylinder bore 26 in the axial direction. The guide ball 30 is in sliding contact with the outer peripheral surface of the guide pin 18 at the fitting hole 31, and the spherical portion is in sliding contact with the inner peripheral surfaces of the shoes 32, 32.

At this time, as shown in FIG.
Even if the guide ball 30 and the shoe 32 are inclined with respect to the guide pin 18 as the inclination angle of the guide shaft 30 with respect to the drive shaft 11 changes, the inner peripheral surface 31a of the fitting hole 31 and the end portion of the shoe 32, and the guide. A predetermined clearance is maintained between the pin 18 and the outer peripheral surface. Therefore, the edge of the fitting hole 31 is
The outer peripheral surface of the guide pin 18 will not be damaged by colliding with or abutting against 18, and partial abnormal wear will not occur. Therefore, the guide ball 30 smoothly moves to the guide pin 18
Since it slides along, the swinging motion of the socket plate 16 becomes smooth.

Moreover, since the clearance is maintained, the lubricating oil is easily supplied between the guide ball 30 and the guide pin 18, so that the oil lubricity of both is improved and the durability of the compressor 3 is improved. .

FIG. 3 is a view showing another embodiment of the present invention. In this case, the side surface (sliding surface) 34a of the groove 34 of the trunnion pin 33 (corresponding to an engaging member) is a guide bar. It has a convex arcuate cross section with respect to 60 (contacting the slide member). The trunnion pin 33 is connected to the one end 16a of the socket plate 16 via a connecting pin.

In the embodiment configured in this way, when the compressor 3 is driven, the trunnion pin 33 moves to the side surface 34 of the concave groove 34.
The portion a is in sliding contact with the outer surface of the guide bar 60, and the spherical portion is in sliding contact with the inner surface 16b of the one end 16a of the socket plate 16.

At this time, as in the above-described embodiment, since a predetermined clearance is maintained between the side surface 34a of the concave groove 34 and the outer peripheral surface of the guide bar 60, the swinging movement of the socket plate 16 becomes smooth, The durability of the compressor 3 will be improved.

[Advantages of the Invention] As described above, in the variable capacity swash plate compressor of the present invention, the sliding surface of the engaging member with the slide member is formed in a convex arcuate cross section with respect to the slide member. , The socket plate for converting the rotary motion of the drive shaft into the reciprocating motion of the piston can be smoothly oscillated, and the oil lubricity between the engaging member and the sliding member is good, and the durability of the compressor is improved. It has a practically great effect of improving.

[Brief description of drawings]

1 and 2 are cross-sectional views showing a connection portion between a socket plate and a guide pin of a variable displacement swash plate compressor according to an embodiment of the present invention, and FIG. 3 is related to another embodiment of the present invention. A perspective view showing a main part of a variable capacity swash plate compressor,
FIG. 4 is a partial cross-sectional view showing a conventional variable capacity swash plate compressor, and FIGS. 5 and 6 are exploded perspective views showing a connecting portion between a socket plate and a slide member of a conventional variable capacity swash plate compressor. 8 are longitudinal sectional views of the same portion in FIG. 3 ... Variable capacity swash plate compressor, 11 ... Drive shaft, 13
...... Drive swash plate, 16 …… Socket plate, 18 …… Guide pin (slide member), 23 …… Piston, 25 …… Cylinder, 30, 50 …… Guide ball (engagement member), 31, 51 ……
Fitting hole, 31a …… Inner peripheral surface (sliding surface), 33,61 …… Trunnion pin (engaging member), 34,63 …… Concave groove, 34a …… Side surface (sliding surface), 60 …… Guide bar (slide member).

Claims (1)

[Scope of utility model registration request] 1. A drive swash plate having a plurality of pistons (23) reciprocally movable in a cylinder (25) and a drive shaft (11) for transmitting a driving force to the pistons (23) having a variable inclination angle. (13) is provided, and a non-rotating socket plate (16) to which the piston (23) is connected is attached to the drive swash plate (13) so as to be swingable by the drive swash plate (13). The socket plate (16) provided in the crank chamber (12)
The socket plate (1) is movably supported by a slide member (18, 60) via an engagement member (30, 33) slidably connected to the slide member (18, 60).
A variable capacity swash plate compressor configured by engaging 6), wherein the slide member (18,
The sliding surface (31a, 34a) with the sliding member (18, 60)
A variable capacity swash plate compressor characterized in that it has a convex arc-shaped cross section with respect to 60).