JPS626116B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, a wedge-shaped rotor having one surface inclined with respect to the rotational center axis is fixed to the end of a main shaft extending into a crank chamber, and the wedge-shaped rotor is further rotated to the inclined surface side of the wedge-shaped rotor. A rocking compressor that converts the rotational motion of the main shaft and wedge-shaped rotor into rocking motion by arranging a movably locked rocking plate to cause the piston in the cylinder to reciprocate. In particular, the present invention relates to a rotational movement prevention mechanism that rotatably locks a rocking plate and blocks only rotational movement.

Conventionally, as a mechanism for preventing rotational movement of the rocking plate of the rocking compressor described above, a pin extending downward is provided at the lower end of the rocking plate, and a groove extending in the axial direction of the casing is formed in the lower part of the crank chamber. A structure has been used in which the pin is inserted into the groove to prevent rotational movement and to cause the rocking plate to swing.However, in such a mechanism, the pin slides in the groove, resulting in a large power loss. At the same time, all of the force that prevents rotational movement is applied to the pin, resulting in poor durability.

Further, a bevel gear is provided on the outer periphery of a bearing formed in the center of the rocking plate to receive a part of the steel ball and fixed to the center of the cylinder block, and on the end face of a ball bearing shaft that receives a part of the steel ball. A mechanism that prevents rotational movement and causes rocking movement by meshing these teeth has a defect in that noise and vibration are generated by the meshing of the teeth when the compressor is driven.

Furthermore, in the case of a mechanism that prevents rotational movement of the oscillating plate by arranging a hook-type universal joint between the oscillating plate and the shaft fixed on the cylinder block, the pin constituting the hook may be The hook was subject to an excessive radial load, and had a defect in that its durability was poor, especially against loads applied from the side of the hook.

In order to eliminate the conventional defects of the rotational movement prevention mechanism as described above, the present invention fixes an outer ring member with a universal joint having constant velocity to the center of the rocking plate, and pairs it with the outer ring member. The inner ring member of the cylinder block is fitted onto the end of a fixed shaft that is slidably fitted into the center hole of the cylinder block, and the balls are held in a plurality of grooves formed on each member so as to be able to roll freely. By arranging a cage that holds the balls in the gap between the outer ring members, a mechanism for preventing rotational movement of the rocking plate is constructed, and a compressor with low noise and vibration, excellent durability, and low power loss is realized. The purpose is to provide

The present invention will be explained below with reference to drawings showing embodiments. Fig. 1 is a sectional view of a compressor showing an embodiment of the present invention, in which 1 is a casing arranged at one end at equal angular intervals on the circumference of the axis. A cylinder block 2 having a cylinder 2a is formed, and the other end opening is provided with an opening 3a in the center through which the main shaft 4 passes, and the main shaft 4 is inserted through a radial bearing 5 press-fitted into the opening 3a. A supporting front housing 3 is disposed and the other end opening is closed.

A suction hole 19a and a discharge hole 19b are bored at one end of the cylinder block 2 at positions corresponding to the cylinder 2a, and the suction hole 19a
A valve plate 19 is connected via a gasket 19b to which a suction valve and a discharge valve (both not shown) are fixed, which control the opening and closing of the discharge hole 19b to control the flow of refrigerant.

Furthermore, a cylinder head 20 defining a suction chamber 20a and a discharge chamber 20b is connected to the valve plate 19 by a partition wall 21 via a gasket 19b'. These valve plates 19, gaskets 19b, 19
b' The cylinder head 20 is fixed on the casing 1 by bolts 22.

The other end of the cylinder block 2 is provided with a central hole 2b into which a fixed shaft 12c is slidably inserted in the axial direction. The fixed shaft 12c is a fixed member 17 that is screwed into a threaded portion 2c formed on one end side of the cylinder block 2 in the central hole 2b.
The cylinder block 2 is restricted from moving toward one end, and the key 16 prohibits rotational movement.

A concave portion 123 is formed in the fixed shaft 12c from the cylinder head 20 side, and the concave portion 123
By inserting an elastic member 18 into the member and bringing one end of the elastic member 18 into contact with the fixed member 17, the fixed shaft 12c obtains an urging force in the direction of the swing plate 10, which will be described later.

A main shaft lead-out cylinder 3b protruding toward the front so as to surround the opening 3a is provided on the outer end surface of the front housing 3, and a mechanical seal 7 is provided in the space between the main shaft 4 contained in the main shaft lead-out cylinder 3b and the inner wall. It is called seal chamber 6. Further, the sealed space formed between the inner wall of the front housing 3 and the end face of the cylinder block 2 is referred to as a crank chamber 1a, and one end face of the main shaft 4 extending within the crank chamber 1a is inclined with respect to the rotation center axis. The wedge-shaped rotor 8 is then fitted.

On the inclined surface side of the wedge-shaped rake 8, one end 9a of a connecting rod 9 having ball portions 9a and 9b at both ends is rotated at the radial end of the surface opposite to the surface facing the inclined surface. A freely fixed rocking plate 10 is provided,
The other end 9b of the connecting rod 9 is connected and fixed to a piston 11 disposed within the cylinder 2a.

Further, a thrust bearing 23 is provided between the inner wall surface of the front housing 3 and the non-slanted surface of the wedge-shaped rotor 8, and between the inclined surface of the wedge-shaped rotor 8 and the opposing surface of the rocking plate 10. A wedge-shaped rotor 8 is provided with a pair of thrust races 24 held between them.
The rotational movement of the shaft is carried out smoothly.

An outer ring member 12a constituting a universal joint 12 having constant velocity is fixed to the center of the swing plate 10 on the cylinder 2a side. The end of the fixed shaft 12c is fitted into a central hole 2b bored in the center of the shaft.

Here, the configuration of the universal joint 12 will be explained with reference to FIG. 2 as well. Rocking plate 1
The center part of the outer ring member 12a fixed to the center of the cylinder 2a is opened toward the cylinder 2a so that an inner wall surface 121a has a spherical shape, and a plurality of grooves 122a extending in the axial direction are formed in the inner wall surface 121a. ing. On the other hand, the inner ring member 12b that fits into the end of the fixed shaft 12c has a substantially drum-like shape with both ends of a sphere cut off in the axial direction.
A plurality of grooves 122 are formed on the outer wall surface 121b opposite to a.
b is formed. These grooves 122a, 12
A ball 13 held by a cage 14 is rotatably held between 2b. The cage 1
4 is a substantially drum-shaped part with a hollow interior, and a ball 13
It has multiple holes that hold. The outer wall surface is in sliding contact with the inner wall surface 121a of the outer ring member 12a, and the inner wall surface is in sliding contact with the outer wall surface 121b of the inner ring member 12b. Here, the inner wall surface 121 of the outer ring member 12a
The spherical center of a, the spherical center of the outer wall surface 121b of the inner ring member 12b, and the spherical center of the outer and inner wall surfaces of the cage 14 are placed on the axis of the main shaft.

Note that FIG. 2 is an exploded perspective view of the universal joint, in which the outer ring member 12a and the cage 14 are not inclined with respect to the main axis.

In the present invention configured as described above, when rotational motion is transmitted to the main shaft 4 from an external driving force such as an engine, the main shaft 4 and the wedge-shaped rotor 8 fitted to the inner end of the main shaft 4 simultaneously rotate. Do some exercise. However, the outer ring member 12a fixed to the center of the rocking plate 10, which is disposed on the inclined surface of the wedge-shaped rotor 8 via the thrust bearing 23, has a groove 122a formed therein.
and an inner ring member 12b that fits into the end of the fixed shaft 12c.
Since the ball 13 is sandwiched between the formed groove 122b so as to be able to roll, the ball 13 is allowed to slide rotatably in the axial direction on the outer wall surface 121b of the inner ring member 12b. The rotational motion of the rotor 8 changes into a rocking motion of the rocking plate 10.

When the rocking plate 10 performs a rocking motion, the rocking plate 1
Reciprocating motion is transmitted to the piston 11 by a connecting rod 9 fixed to the radial end of the piston 11,
The piston 11 reciprocates within the cylinder 2a.

As a result, fluid can be taken in and compressed in the cylinder 2a.

Here, prevention of rotation of the swing plate 10 will be explained.

The force that attempts to rotate the rocking plate 10 is based on the gas compression reaction force, and this force is the portion of the gas compression reaction force transmitted from the piston 11 to the rocking plate 10 via the piston rod 9. It can be expressed as the sum of tangential components. Now, in the present invention, a plurality of grooves 122a extending in the axial direction are formed on the inner wall surface 121a of the outer ring member 12a, and the grooves 122a
Outer wall surface 1 of inner ring member 12b formed opposite to
Since the ball 13 is held between the ball 13 and the groove 122b on the outer ring member 12b so as to be able to roll, the force to rotate the rocking plate 10 is transmitted to the ball 13 from one side of the groove 122a of the outer ring member 12a. Inner ring member 12b
It will be added to the other side of the groove 122b. Since the inner ring member 12b is fitted onto the fixed shaft 12c whose rotational movement is prohibited by the key 16, the force that attempts to rotate the rocking plate 10 is received by the fixed shaft 12c. Rocking plate 1
0 never rotates.

Note that, as shown in FIG. 3, the grooves 122a, 12
Since the cross section of the groove 2b is shaped such that the ball 13 contacts only one point on each side of the groove, machining errors can be tolerated and uneven wear of the side surfaces of the grooves 122a and 122b and the ball 13 is prevented.

Furthermore, the problem that one end of the rocking plate 10 tends to rise from the inclined surface of the wedge-shaped rotor 8 due to a portion of the gas compression reaction force is prevented by absorbing this lifting force with the cage 14.

Further, the ball 13 rolls within the grooves 122a and 122b so as to be positioned on the bisector of the angle formed by the fixed shaft 12c and the swing plate 10.

As described above, in the present invention, the outer ring member 12a is fixed to the rocking plate 10, the inner ring member 12b is fitted to the fixed shaft 12c which is stopped from rotating within the cylinder block 2, and the groove 122a formed in each member is 12
2b holds the ball 13 so that it can roll, and the rocking plate 1
Since the rotational movement of 0 is inhibited, the contact area at the rotation inhibiting portion (that is, between the ball 13 and the grooves 122a, 122b) becomes smaller, thereby reducing noise and power loss. Further, since the universal joint 12 having uniform velocity is used as the rotational motion prevention mechanism, the generation of vibration can be suppressed to a low level.
Furthermore, the cross-sectional shapes of the grooves 122a and 122b are designed to provide good durability.

[Brief explanation of the drawing]

FIG. 1 is a central cross-sectional view of an oscillating compressor showing an embodiment of the present invention, and FIG. 2 is an exploded perspective view of a universal joint, showing the central axis of the inner ring member 12b, the central axis of the cage 14, and the outer ring member. The drawing is made so that the central axis of 12a coincides with the central axis. FIG. 3 is an enlarged partial sectional view showing a state in which a ball is held between a groove in an outer ring member and a groove in an inner ring member. 1...Casing, 2...Cylinder block, 3
...Front housing, 4...Main shaft, 8...Wedge-shaped rotor, 9...Connecting rod, 10...Winging plate,
11...Piston, 12...Universal joint.

Claims (1)

[Claims] 1. A casing having a cylinder block that is open at one end and has a plurality of cylinders arranged at equal angular intervals at the other end, a front housing that closes the opening at one end, and a casing that passes through the center of the front housing. a main shaft that is rotatably supported; a crank chamber formed between the cylinder block and the front housing; and one end surface that fits into the end of the main shaft on the crank chamber side and is connected to the front housing via a bearing. a wedge-shaped rotor that is thrust-supported by an inner wall and whose other end surface is inclined with respect to the main shaft; and a rocking plate disposed on the inclined surface of the wedge-shaped rotor via a bearing.
A rocking compressor having a connecting rod that is ball-connected at one end at a radial end of the rocking plate, and a piston that is ball-connected at the other end of the connecting rod and slides back and forth within the cylinder. an outer ring member that is fixed to the center of the rocking plate and has an opening with a central portion facing toward the cylinder so that the inner wall has a spherical shape, and a plurality of grooves extending in the axial direction on the inner wall of the opening; On the outer wall surface facing the groove in the opening inner wall of the outer ring member, which is fitted into the end of the fixed shaft that is slidably fitted into a central hole bored in the center of the block and elastically biased in the direction of the rocking plate. an inner ring member forming a plurality of grooves in the outer ring member; a plurality of balls rollably held between the grooves of the outer ring member and the inner ring member; The outer wall surface of the inner ring member and the casing having holes for holding the balls constitute a universal joint having constant velocity, and the sliding plate is rotatably engaged by the universal joint. An oscillating compressor characterized in that it stops and prevents rotational movement. 2. The rocking device according to claim 1, wherein the cross section of the groove formed in the outer ring member and the inner ring member is such that the ball contacts only one point on each of both side surfaces of the groove. type compressor.