JPH0338460Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an oscillating compressor, and particularly to an oscillating compressor structure that prevents increase in vibration due to thrust needle bearings.

[Prior Art] Generally, an oscillating compressor for a car cooler is driven by rotating the main shaft of the compressor using an external engine or the like. A wedge-shaped rotor is fixed to one end of the main shaft. When the rotor rotates, the piston makes a reciprocating motion and suctions and compresses refrigerant gas. When compressing refrigerant gas, compression force is applied to the piston as a load. The compressive force is transmitted to the planet plate through the piston rod, and is then received by the front housing through the rotor.

Incidentally, in order to smoothly rotate the rotor, thrust needle bearings are interposed in the gap between the front housing and the rotor and the gap between the rotor and the planet plate. Each of these thrust needle bearings has two ring-shaped thrust races facing each other and a thrust needle interposed between these thrust races. (For example, Jikko 55-56215
(Refer to the publication) [Problem to be solved by the invention] By the way, in this type of compressor, the piston is subjected to fluctuations in pressure (force) due to suction and compression of gas. This pressure variation is transmitted to the front housing via the planet plate-rotor path. The front housing is bolted to the cylinder block, and the cylinder block has a mounting portion for fixing the compressor to the vehicle engine.

On the other hand, since the rotor is slightly inclined due to the clearance and elastic deformation of each part of the compressor, the thrust needle bearing interposed in the gap between the rotor, planet plate, and front housing is locally subjected to strong force. As a result, vibrations increase and are transmitted to the front housing, cylinder block, and further to the engine section, causing noise in the passenger compartment.

In view of the above problems, the technical issues of this invention are:
To prevent an increase in vibration caused by pressure fluctuations of a piston from being transmitted to a front housing or a cylinder block with a simple structure.

[Means for Solving the Problems] According to the present invention, a main shaft is rotatably supported in a front housing, a wedge-shaped rotor is attached to the end of the main shaft in the crank chamber, and the rotor is rotatable relative to the inclined surface of the rotor. In an oscillating compressor in which a piston is reciprocated via a planet plate supported by An oscillating compressor is obtained, which is characterized in that a sliding bearing equipped with an inclination adjustment mechanism is disposed.

[Function] In the present invention, since a sliding bearing with an automatic tilting mechanism is provided between the rotor and the planet plate and at least one between the rotor and the front housing, fluctuations in suction and compression, etc. You can receive it at In other words, the inclination of the rotor is substantially automatically adjusted by the sliding bearing, and by using the sliding bearing, the vibration and noise generated by the rolling bearing are reduced, and the vibration to the front housing and cylinder block is reduced. Transmission is reduced.

[Example] The present invention will be explained below with reference to examples.

Referring to FIG. 1, 1 is a cylindrical casing that includes a cylinder block 1' having a plurality of cylinders 2 at one end thereof. The end of the cylindrical casing 1 on the cylinder block 1' side is closed by a valve plate 3 and a cylinder head 4 forming a suction chamber 5 and a discharge chamber 6, and the other end is closed by a front housing which supports a main shaft 7 in the center. It is blocked at 8.

A radial needle bearing 9 is disposed in the center of the front housing 8, and receives the load in the radial direction of the main shaft 7 supported thereon, thereby allowing the main shaft 7 to rotate smoothly. A wedge-shaped rotor 10 is fitted and fixed to the inner end of the main shaft 7. A planet plate 11 is arranged opposite the inclined surface of the rotor 10. A bevel gear 12 is fixed to the center of the planet plate 11. The bevel gear 12 is a bevel gear 13 fixed to the center hole of the cylinder block 1 and having the same number of teeth.
It's meshing with each other. In this way, planet plate 1
1 is prevented from rotating. As a result, the planet plate 11 swings in response to the rotation of the rotor 10. Note that a steel ball 14 is interposed between the bevel gears 12 and 13.

A piston 16 is connected to the planet plate 11 via a rod 15. piston 16
reciprocates within the cylinder 2 in response to the rocking of the planet plate 11.

A first sliding bearing 21 is arranged between the front housing 8 and the rotor 10. Similarly, the inclined surface of the rotor 10 and the planet plate 1
1, a second sliding bearing 22 is provided between the two.

The first sliding bearing 21 includes a ring-shaped thrust race 23 and a plurality of spherical bodies 26 slidably arranged on the thrust race 23. This spherical body 26 has one surface (the surface in contact with the thrust race 23)
is a planar hemisphere (radius R).
The thrust race 23 is attached to the rotor 10, and the spherical surface of the spherical body 26 is received in a receiving hole 8a formed in the front housing 8 in advance.

The second sliding bearing 22 includes a ring-shaped thrust race 28 and a plurality of spherical bodies 31 slidably arranged on the thrust race. This spherical body 31 has a hemispherical shape (radius R) with one surface (the surface in contact with the thrust race 28) being flat. The thrust race 28 is attached to the inclined surface of the rotor 10, and the spherical surface of the spherical body 31 is received in a receiving hole previously formed in the planet plate 11.
That is, as shown in FIG. 2a, the planet plate 11 is provided with a plurality of receiving holes 11a at predetermined intervals on a predetermined circumference, and the spherical surface of the spherical body 31 is inserted into the receiving holes 11a. are in contact. The number of receiving holes 11a is equal to the number of pistons 16, and as shown in FIG.
It is formed at a position on the circumference corresponding to the piston rod receiving hole 11b formed in 1. In other words,
The spherical bodies 31 are provided in a number corresponding to the number of pistons 16, and are provided on the planet plate 11 in correspondence with the mounting positions of the piston rods 15.

According to the above configuration, the piston 16 moves in response to the rocking of the planet plate 11, as shown in FIG.
When the rotor reciprocates within the cylinder 2, a force in an inclination direction is applied to the rotor due to fluctuations in suction and compression.
At the same time, the spherical surfaces of the spherical bodies 26 and 31 slide (radial sliding) within the receiving holes 8a and 11a, respectively. That is, the sliding bearing allows the inclination angle of the rotor 10 to be substantially automatically adjusted by suction/compression fluctuations. As a result, the compressor is no longer subjected to strong local forces, and since the roller bearing is replaced by a sliding bearing, the vibration and noise generated by the compressor are extremely reduced. Furthermore, since the spherical body is only subjected to a compressive load once per rotation of the main shaft, its life is extended. Furthermore, it is desirable that the spherical body has a very low coefficient of friction by surface treatment or the like.

The spherical body 31 may be one in which a sliding plate 31b is attached to a sphere 31a as shown in FIG.
The ball 31a is received in the receiving hole 11a. In this case, the spherical body 26 is also configured in the same manner.

On the other hand, since the variation in the inclination angle of the rotor 10 due to suction/compression variation is slight, the movement of the spherical body is extremely small. Therefore, in order to reduce the axial dimension of the compressor, the radius R of the spherical bodies 26 and 31 may be increased to increase the curvature.

By the way, in the above-mentioned embodiment, a case was explained in which a sliding bearing was arranged between the rotor and the front housing and between the rotor and the planet plate. The spherical surface may be placed on either side between the bearing and the net plate, or the spherical surface may be placed on the rotor side when arranging the sliding bearing. Furthermore, the thrust may be directly received by the rotor 10 without using the thrust races 23 and 28.

[Effects of the invention] As explained above, in the present invention, a sliding bearing equipped with an automatic tilt angle adjustment mechanism is disposed between the rotor and the front housing and at least one of the rotor and the planet plate, so that the rolling bearing is The vibration and noise generated by compressors, as well as the vibrations and noise generated by receiving strong local forces, can be reduced by sliding bearings, and as a result, the vibrations and noise generated by the compressor can be extremely reduced.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the oscillating compressor according to the present invention, Figs. 2 a and b are views showing the structure of the planet plate, and Fig. 3 explains the force applied to the rotor in the tilt direction. FIG. 4 is a diagram showing another example of a sliding bearing. 8...Front housing, 10...Rotor,
DESCRIPTION OF SYMBOLS 11... Planet plate, 21... First sliding bearing, 22... Second sliding bearing.

Claims (1)

[Scope of utility model registration request] A main shaft is rotatably supported in the front housing, a wedge-shaped rotor is attached to the end of the main shaft in the crank chamber, and the piston is reciprocated via a planet plate supported relatively rotatably on the inclined surface of the rotor. In the oscillating compressor, a sliding bearing with an automatic tilt adjustment mechanism is disposed between the rotor and the planet plate and at least one of the rotor and the front housing. dynamic compressor.