JPH04259682A - Variable capacity compressor with swash plate - Google Patents

Abstract

PURPOSE:To eliminate polishing of a balance ring and lapping process, suppress the manufacturing cost, and increase combination possibility of materials of a swing plate and the balance ring. CONSTITUTION:A variable capacity compressor with swash plate according to the present invention comprises a swash plate 13 mounted with the inclining angle variable on a main shaft 9 arranged in a crank chamber 10, a swing plate 16 which swings oscillatively with rotation of this swash plate and reciprocates a piston 23 in a cylinder 22, and a balance ring 21 fitted on a boss 20 on the swash plate 13. Therein a slide race 50 is furnished between the swing plate 16 and balance ring 21.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable capacity swash plate compressor.

0002

[Prior Art] A conventional variable capacity swash plate compressor converts the rotational motion of a swash plate mounted on a main shaft with a variable inclination angle in the crank chamber into the oscillating motion of a oscillating plate. A structure in which a piston connected to a rocking plate is reciprocated is known. This type of compressor is used, for example, by connecting its suction side to the outlet side of an evaporator of a cooling system. Then, the compression capacity is increased by adjusting the pressure in the crank chamber and changing the angle of inclination of the swash plate relative to the main shaft and changing the stroke of the piston in response to changes in the rotation speed of the compressor or the load on the evaporator, etc. It's changing.

Further, generally, in order to dynamically balance the swash plate during its rotational movement, the swash plate is provided with a ring-shaped balance ring that rotates together with the swash plate. In this case, a structure is used in which the center hole of the balance ring is fitted into the boss portion of the swash plate, and the balance ring is locked by a locking ring or the like attached to the boss portion.

0004

[Problems to be Solved by the Invention] By the way, in the structure provided with the above-mentioned balance ring, the balance ring rotates and the swinging plate only swings and does not rotate. Slide into contact. Therefore, in order to ensure good sliding contact and bring them into surface contact, the contact surface of the balance ring with the rocking plate must be polished, lapped, etc. to improve accuracy. There is a problem that the compressor is expensive.

[0005] Furthermore, since the rocking plate and the balance ring are in sliding contact with each other in a surface contact state, it is necessary that these materials have good contact characteristics with each other, and there is also the problem that the materials are limited.

Therefore, an object of the present invention is to be able to make sliding contact between the rocking plate and the balance ring smooth at low cost, and to freely combine the materials of the rocking plate and the balance ring. An object of the present invention is to provide a variable capacity swash plate compressor that can perform

[0007]

[Means for Solving the Problems] According to the present invention, a swash plate is attached to a main shaft disposed in a crank chamber so as to have a variable inclination angle, and the rotation of the swash plate swings and reciprocates a piston in a cylinder. In the variable capacity swash plate compressor, the compressor includes a oscillating plate to be moved, and a balance ring fitted to a boss portion of the swash plate, wherein between the oscillating plate and the balance ring,
A variable capacity swash plate compressor characterized by having a sliding race is obtained.

[0008]

[Function] By providing the above-mentioned sliding race, there is no direct sliding contact between the rocking plate and the balance ring, and as a result, there is no need for polishing or lapping the balance ring as in the past, and as a result, the manufacturing cost of the compressor is reduced. is reduced accordingly. In addition, since the rocking plate and balance ring slide against each other via the sliding race, the number of combinations of materials for the rocking plate and balance ring increases, making it possible to create appropriate combinations of materials at low cost. becomes.

[0009]

[Example] An example will be explained below. In FIG. 1, a casing 1 is composed of a casing body 3 that is approximately cylindrical and integrally has a cylinder block 2 at one end, and a generally disc-shaped front end plate 4 that closes an opening at the other end of the casing body 3. . A main shaft 9 rotatably supported by bearings 7 and 8 is inserted into through holes 5 and 6 formed in the cylinder block 2 and the front end plate 4, respectively. Further, a crank chamber 1 configured between the cylinder block 2 and the front end plate 4
A rotor 11 attached to a main shaft 9 is disposed within the rotor 0 .

A swash plate 13 is attached to the rotor 11 via a hinge mechanism 12. The inner wall surface 14 of the swash plate 13 is in contact with the main shaft 9 and is slidable. The angle of inclination of the swash plate 13 relative to the main shaft 9 is changed by the hinge mechanism 12. The swash plate 13 also includes a swing plate 1 to which a plurality of piston rods 15 are connected by ball connection.
6 is attached via bearings 17 and 18. The central boss portion 20 of the swash plate 13 has a
A ring-shaped balance ring 21 that rotates with the
are mounted, and the swing plate 16 is held between the swash plate 13 and the balance ring 21.

A plurality of cylinders 22 are formed in the cylinder block 2 at predetermined intervals so as to surround the main shaft 9. The piston rod 15 is connected to the cylinder 2
It is ball-coupled to a piston 23 located within 2.

Furthermore, a guide rod 24 parallel to the main shaft 9 is disposed within the crank chamber 10.
is rotatably supported by the cylinder block 2 at one end and by the front end plate 4 at the other end. The guide rod 24 is held by the clamping portion 25 of the swing plate 16, whereby the swing plate 16 is prevented from rotating (rotating on its own axis) and performs only a swing motion.

On the other hand, a valve plate 3 is provided on the right end surface of the casing 1.
A cylinder head 31 is disposed through the cylinder 0, and the cylinder head 31 has a suction chamber 32 and a discharge chamber 33.
each formed. The suction chamber 32 is connected to the suction port 3
4, and the discharge chamber 33 communicates with a discharge port 35. A suction port 36 and a discharge port 37 are respectively formed in the valve plate 30, and the suction chamber 32 and discharge port chamber 33 are
It communicates with the cylinder 22 via these.

Furthermore, in the center of the cylinder block 2,
A control valve 40 that controls communication between the crank chamber 10 and the suction chamber 32 is provided.

The above configuration is similar to that of a conventional variable capacity swash plate compressor, but in this embodiment, as shown in FIG. is provided. And in the case of this example,
The rocking plate 16 is made of aluminum alloy, the balance ring 21 is made of iron, and the sliding race 50 is made of iron.

Furthermore, as shown in FIG. 3, a sliding race 50
Claws 51 and 52 are formed at the upper and lower ends of the balance ring 3, respectively.
There are recesses 53 that fit into the claws 51 and 52, respectively.
, 54 are provided. And these claws 51, 52
By fitting the recesses 53 and 54, the sliding race 5
0 is fixed to the balance ring 21, and both rotate together, and the rocking plate 16 and the sliding race 50 come into surface contact.

Although the sliding race 50 is fixed to the balance ring 21 in this embodiment, it may also be fixed to the swing plate 16, or it can simply be placed between the swing plate 16 and the balance ring 21. , it is not necessary to fix the sliding race 50 to other members. The precision of this sliding race 50 can be ensured by press/barrel polishing, making it suitable for mass production.

As described above, the sliding race 50 is attached to the rocking plate 1.
Various sliding combinations are possible depending on whether the oscillating plate 16 is fixed to the balance ring 21 or simply arranged between the oscillating plate 16 and the balance ring 21.
The degree of freedom of the sliding surface between 6 and the balance ring 21 is increased.

[0019]

As described above, the variable capacity swash plate compressor of the present invention has a structure in which a sliding race is provided between the rocking plate and the balance ring, so that the rocking plate and the balance ring can directly slide. There will be no more contact. This eliminates the need for polishing, lapping, etc. of the balance ring as in the prior art, and the manufacturing cost of the compressor can be reduced. In addition, since the rocking plate and the balance ring are in sliding contact via the sliding race, the range of material combinations for the rocking plate and balance ring is expanded, making it possible to create appropriate combinations of materials at low cost. It has the effect of becoming.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a variable capacity swash plate compressor according to an embodiment of the present invention.

FIG. 2 is an exploded sectional view of essential parts of the variable capacity swash plate compressor shown in FIG. 1;

FIG. 3 is a plan view of the sliding ring shown in FIG. 2;

[Explanation of symbols]

9 Main shaft 10 Crank chamber 13 Swash plate 16 Rocking plate 20 Central boss part 21 Balance ring 22 Cylinder 23 Piston 50 Sliding race

Claims (1)

[Claims] Claim 1: A swash plate mounted on a main shaft disposed in a crank chamber so as to have a variable inclination angle; a oscillation plate that swings as the swash plate rotates to reciprocate a piston in a cylinder; A variable capacity swash plate compressor comprising a balance ring fitted to a boss portion, the variable capacity swash plate compressor comprising a sliding race between the rocking plate and the balance ring. Machine.