JPH05126139A - Thrust supporter of turning member - Google Patents

Abstract

PURPOSE:To improve the working efficiency and lifespan of a thrust supporter for supporting a turning scroll member in a scroll compressor and so on, in such a way that the member is not autorotated, and to facilitate the manufactur ing thereof. CONSTITUTION:A bearing 8 for drive transmission, comprising a thrust and a rolling bearing that can support a radial load, is mounted on an eccentric position of a rotational drive shaft 7 supported by a fixed member 6 so that the shaft can be freely rotated. A turning scroll member 2 is installed in the bearing 8 for drive transmission. A rotation inhibiting device 9 for inhibiting the rotation of the turning scroll member 2, is provided between a part in the circumferential direction of the turning scroll member 2 and the fixed member 6. A rolling bearing 19 is mounted on a pin 18 protruded on the fixed member 6, for example, for the rotation inhibiting device 9, and an engagement pin 20 of the under surface of the turning scroll member 2, is engaged with the outer wheel of the rolling bearing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thrust support device used in a scroll compressor or the like to support a revolving member such as a revolving scroll member so as not to rotate.

[0002]

2. Description of the Related Art A scroll compressor, as shown in FIG. 4, has an orbiting scroll member 51 and a fixed scroll member 52.
Spiral partition walls 53 and 54 are respectively provided on the
The compression chamber 55 formed between
The compression operation is performed by changing the volume with the eccentric rotation. The orbiting scroll member 51 is eccentrically rotated by the orbiting radius of the eccentricity e by the rotation of the rotary drive shaft 57 by engaging the eccentric hole of the rotary drive shaft 57 with the shaft portion 51a protruding from the lower surface. The rotary drive shaft 57 is composed of a rotor shaft of a motor 58, and has upper and lower bearings 59, 6 on a fixed member 61.
Supported by 0.

The orbiting scroll member 51 is supported by a fixed member 61 by a thrust bearing 62 because a large thrust load is applied by the gas pressure in the compression chamber 55. Since the thrust bearing 62 does not have a general-purpose rolling bearing capable of supporting eccentric rotation, a slide bearing is generally used. Further, since the orbiting scroll member 51 needs to prevent rotation and be eccentrically rotated in a fixed posture, an appropriate rotation preventing device (not shown) is provided between the orbiting scroll member 51 and the fixed member 61. ..

However, in the above structure, since the thrust bearing 62 made of a slide bearing is used to support the orbiting scroll member 51, there is a problem that the coefficient of friction is large and the operating efficiency is lowered.

For this reason, attempts have been made to achieve rolling contact, and as one example, recesses 63 and 64 are formed in the orbiting scroll member 51 and the fixing member 61 as shown in FIG. 5 (A).
It is proposed that a ball be provided and a ball 65 be interposed. The recesses 63 and 64 are formed at a plurality of positions in the circumferential direction.
The recesses 63 and 64 are designed such that the orbit diameter within which the ball 65 can freely roll is designed to be equal to the eccentric amount e (FIG. 4) of the orbiting scroll member 51. Rotation prevention of the scroll member 51 is also performed.

Instead of the recessed portion 63, it has been proposed that, as shown in FIG. 5 (B), raceway grooves 66 and 67 having an arc-shaped groove cross section are annularly provided with a raceway diameter of the eccentric amount e ( For example, JP-A-55-155916).

[0007]

In the structure of FIG. 5A, since the bottom surfaces of the recesses 63 and 64 are flat surfaces, the contact between the ball 65 and the bottom surfaces of the recesses 63 and 64 is point contact.
Therefore, when a large thrust load is applied by the gas pressure of the compression chamber 55 (FIG. 3) as described above, the contact pressure per unit area becomes very large, and wear and rolling fatigue are remarkable,
There is a problem that the life of the bearing is shortened.

In the case of the example of FIG. 5B, the raceway grooves 66, 6
Since the inner surface of 7 is arcuate, the contact area with the ball 65 is increased, the surface pressure is reduced, and the bearing life is improved. However, such an annular raceway groove 6 having an arcuate cross section
6, 67 to orbiting scroll member 51 and fixed frame 61
However, there is a problem that productivity is poor.

An object of the present invention is to improve the operating efficiency and life of a thrust support device for preventing rotation of a turning member to support eccentric rotation and to facilitate manufacture.

[0010]

DISCLOSURE OF THE INVENTION A thrust support device of the present invention is a drive transmission comprising a rolling bearing capable of supporting thrust and radial loads at an eccentric position of a rotary drive shaft rotatably supported by a fixed member. A bearing is attached, and a swing member is installed on the drive transmission bearing. The drive transmission bearing may be a single rolling bearing or a combination of a plurality of rolling bearings. A rotation prevention device that prevents rotation of the turning member is provided between a part of the turning member in the circumferential direction and the fixed member.

[0011]

When the rotary drive shaft rotates, the turning member supported by the shaft at the eccentric position via the drive transmission bearing rotates eccentrically together with the drive transmission bearing. At this time, the rotation of the turning member is prevented by a rotation prevention device provided between a part of the turning member in the circumferential direction and the fixed member, and the turning member eccentrically rotates in a fixed posture. The thrust load acting on the swivel member is supported by the drive transmission bearing.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIGS. This embodiment is an example applied to a scroll compressor. The fixed scroll member 1 and the orbiting scroll member 2 each have spiral partition walls 3 and 4, and a compression chamber 5 is formed between the partition walls 3 and 4. The fixed scroll member 1 is fixed to a fixed member 6 serving as a housing. The rotary drive shaft 7 that drives the orbiting scroll member 2 is
It serves as a rotor shaft of the motor 11, and is rotatably supported by the fixed member 6 by upper and lower bearings 12 and 13. The upper and lower bearings 12 and 13 each include a cylindrical roller bearing, a deep groove ball bearing, and the like.

The orbiting scroll member 2 is supported on a large-diameter portion 7a of the upper end of the rotary drive shaft 7 by a drive transmission bearing 8 which is eccentric from the center of rotation O by an eccentric amount a, and a portion in the circumferential direction is rotated. It is connected to the fixing member 6 by a prevention device 9.

The drive transmission bearing 8 is a rolling bearing capable of supporting thrust and radial loads. As shown in FIG. 2, a deep groove type radial ball bearing 14 and a flat seat type thrust ball bearing 15 are combined. Configured. That is, the flange 16 is provided on the transmitted shaft 10 projecting at the center of the lower surface of the orbiting scroll member 2, and the radial direction is provided above the flange 16 between the transmitted shaft 10 and the inner diameter surface of the eccentric hole 17 of the rotary drive shaft 7. The ball bearing 14 is interposed and the flange 16
The thrust ball bearing 15 is disposed between the lower surface of the above and the bottom surface of the eccentric hole 17.

As shown in the enlarged view of FIG. 3, the rotation preventing device 9 shown in FIG. The dowel pin 20 is engaged with the engaging hole 22 of the outer ring 21 of the rolling bearing 19. Engaging pin 20 and engaging hole 2
The sliding bearing 23 formed of a sleeve is provided between the sliding bearing 23 and the inner diameter surface of the second bearing 23.
Is interposed. The outer ring 21 is formed as an eccentric ring that is biased toward the engagement hole 22 side, or the peripheral portion of the engagement hole 22 is projected. The eccentricity b between the support pin 18 and the locking pin 20 is equal to the eccentricity a of the drive transmission bearing 8 with respect to the rotary drive shaft 7.

The operation of the above configuration will be described. Rotary drive shaft 7
When is rotated, the orbiting scroll member 2 engaged with the drive transmission bearing 8 at the eccentric position by the transmitted shaft 10 performs eccentric rotation with the orbiting radius of the eccentric amount a. With the eccentric rotation, a force that causes the orbiting scroll member 2 to rotate is applied, but the orbiting scroll member 2 has an engagement pin 20 projecting from the lower surface thereof, which has an outer ring of the rolling bearing 19 of the rotation preventing device 9. 21
, And eccentrically rotates with the same eccentric amount b as the radius a of the eccentric rotation of the orbiting scroll member 2, rotation is prevented.

As described above, the orbiting scroll member 2 rotates eccentrically in a fixed posture without rotation. As a result, the volume of the compression chamber 5 between the fixed scroll member 1 and the orbiting scroll member 2 changes, and the compression operation is performed. The thrust load acting on the orbiting scroll member 2 due to the gas pressure in the compression chamber 5 is transmitted to the rotary drive shaft 7 via the drive transmission bearing 8, and is supported by the fixed member 6 by the lower bearing 13.

In this thrust support device, since the drive transmission bearing 8 of the rotary drive shaft 7 also serves as the thrust support of the orbiting scroll member 2 and the dedicated rotation preventing device 9 is provided, the thrust load is generated by rolling contact. Can be supported to improve the operating efficiency, and the conventional thrust bearing that also functions as a rotation preventive can be eliminated. The drive transmission bearing 8 is composed of a normal radial ball bearing 14 and a thrust ball bearing 15,
Since many of these bearings 14 and 15 have excellent durability, the life of the thrust support device can be easily improved. Further, since the ordinary ball bearings 14 and 15 are incorporated, it is not necessary to form a raceway groove or the like for the thrust bearing on the orbiting scroll member 2 or the like, which facilitates manufacturing.

In the above embodiment, the drive transmission bearing 8 is constructed by combining the radial ball bearing 14 and the thrust ball bearing 15. However, the drive transmission bearing 8 is a single-row or double-row angular bearing. Is also good. Also, the rotation prevention device 9
Is not limited to the configuration shown in the figure, and various configurations such as using a crank shaft or an eccentric shaft can be used.

[0020]

According to the thrust support device of the present invention, a rolling bearing capable of thrust support is used as a drive transmission bearing for transmitting the drive from the rotary drive shaft to the swivel member, and the thrust support of the swivel member is provided by the drive transmission bearing. In addition to the above, since a dedicated anti-rotation device is provided, the thrust load can be supported by rolling contact, the operating efficiency is improved, and the conventional thrust bearing that also serves as anti-rotation can be eliminated. As described above, since the normal rolling bearing is used without providing the thrust bearing also for preventing rotation, the life can be easily improved against wear and rolling fatigue, and special processing is not required, which facilitates manufacturing.

[Brief description of drawings]

FIG. 1 is a sectional view of a scroll compressor to which a thrust support device according to an embodiment of the present invention is applied.

FIG. 2 is an enlarged cross-sectional view showing a portion in the vicinity of the drive transmission bearing.

FIG. 3 is an enlarged sectional view showing the rotation prevention device of the same.

FIG. 4 is a schematic sectional view of a conventional scroll compressor.

5A and 5B are partial cross-sectional views of a thrust support device of a scroll compressor in another conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Fixed scroll member, 2 ... Orbiting scroll member, 6
... Fixed member, 7 ... Rotation drive shaft, 8 ... Drive transmission bearing, 9
... autorotation preventive device, 10 ... transmitted shaft, 14 ... radial ball bearing, 15 ... thrust ball bearing, 19 ... rolling bearing, 20 ...
Engagement pin

Claims (1)

[Claims] 1. A drive transmission bearing comprising a rolling bearing capable of supporting thrust and radial load is attached to an eccentric position of a rotary drive shaft rotatably supported by a fixed member,
A thrust support device for a swivel member, wherein a swivel member is installed on the drive transmission bearing, and a rotation preventing device for preventing rotation of the swivel member is provided between a part of the swivel member in the circumferential direction and a fixed member.