JP2008256024A - Rolling bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive rolling bearing device improved in wear characteristics of a bearing. <P>SOLUTION: This rolling bearing device 30 for supporting a turning scroll member 1 to which a radial load and a thrust load are simultaneously applied includes a cylindrical rolling bearing 31 receiving the radial load and an angular ball bearing 32 arranged adjacently to the cylindrical rolling bearing 31 and receiving the thrust load. A first inner ring raceway surface 35a on which the cylindrical roller 31 of the cylindrical rolling bearing 31 rolls and a second inner ring raceway surface 35b on which the ball 42 of the angular ball bearing 32 rolls are formed on the peripheral surface of a single inner ring 35. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rolling bearing device suitable for supporting a rotating shaft in a mechanical device having a rotating shaft on which a radial load and a thrust load act simultaneously, such as a turning scroll member of a scroll compressor. .

  As shown in FIG. 6, the scroll compressor is provided with a spiral partition 3 in each of the orbiting scroll member 1 and the fixed scroll member 2, and the compression chamber 4 formed between the spiral partition 3 is provided as an eccentricity of the orbiting scroll member 1. The compression operation is performed by changing the volume with rotation (for example, see Patent Document 1).

  The orbiting scroll member 1 is connected to the main shaft rotor 6 by the shaft portion 5 projecting from the lower portion thereof being fitted into the eccentric hole 7 at the tip of the main shaft rotor 6 via the slide bearing 8. The rotation center axis La (corresponding to the center axis of the eccentric hole 7) of the shaft portion 5 of the orbiting scroll member 1 fitted in the eccentric hole 7 is eccentric with respect to the rotation center axis Lb of the main shaft rotor 6 by an eccentric amount ε. As the spindle rotor 6 rotates, the orbiting scroll member 1 rotates eccentrically with the orbiting radius of the eccentric amount ε.

  The spindle rotor 6 is rotatably supported by the motor housing 9 via a bearing 10 on one end side (upper end side in the figure) and a bearing (not shown) on the other end side (lower side in the figure). Inside, a stator 11 is provided for applying a rotational driving force to the main shaft rotor 6. The fixed scroll member 2 is attached to one end side of the motor housing 9 via an intermediate housing 12.

When the orbiting scroll member 1 rotates eccentrically, it receives a radial load and a thrust load due to the gas pressure in the compression chamber 4, and these loads are transmitted to the main shaft rotor 6. Is provided with a roller bearing 13 that receives a radial load and a thrust bearing 14 that receives a thrust load. As the thrust bearing 14, a general-purpose sliding bearing is generally used.
Japanese Patent Laid-Open No. 2001-208083 (FIG. 1)

  By the way, as described in Patent Document 1, when a sliding bearing is used as a thrust bearing, the friction loss increases, so that there is a problem that wear of the sliding bearing occurs and the operating efficiency of the compressor decreases. .

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a low-cost rolling bearing device capable of improving the wear characteristics of the bearing.

The above object of the present invention is achieved by the following configurations.
(1) A rolling bearing device for supporting a rotating shaft on which a radial load and a thrust load act simultaneously,
A roller bearing that receives the radial load;
A ball bearing portion disposed adjacent to the roller bearing portion and receiving the thrust load;
With
The first inner ring raceway surface on which the roller of the roller bearing portion rolls and the second inner ring raceway surface on which the ball of the ball bearing portion rolls are formed on the outer peripheral surface of a single inner ring. A rolling bearing device characterized by.
(2) The inner ring has a first fitting hole for fitting the first shaft on the roller bearing portion side, and a second for fitting the second shaft on the ball bearing portion side. The rolling bearing device according to (1), wherein a fitting hole is formed.
(3) The rolling bearing device according to (2), wherein a center axis of the first fitting hole and a center axis of the second fitting hole are eccentric from each other.
(4) The rolling according to any one of (1) to (3), wherein the outer diameter of the outer bearing of the ball bearing portion is set smaller than the outer diameter of the outer ring of the roller bearing portion. Bearing device.
(5) The first outer ring raceway surface on which the roller of the roller bearing portion rolls and the second outer ring raceway surface on which the ball of the ball bearing portion rolls are formed on the inner peripheral surface of a single outer ring. The rolling bearing device according to any one of (1) to (4), wherein:

  According to the rolling bearing device of the present invention, since the roller bearing portion that receives the radial load and the ball bearing portion that is disposed adjacent to the roller bearing portion and receives the thrust load are provided, the wear characteristics of the bearing are improved. When incorporated in a compressor, the operating efficiency of the compressor can be improved and the life can be extended. Further, the first inner ring raceway surface on which the rollers of the roller bearing portion roll and the second inner ring raceway surface on which the balls of the ball bearing portion roll are formed on the outer peripheral surface of the single inner ring. By sharing the inner ring, the cost becomes low.

  Hereinafter, a rolling bearing device according to each embodiment of the present invention will be described in detail with reference to the drawings.

(First embodiment)
FIG. 1 is a sectional view of a scroll compressor incorporating the rolling bearing device of the first embodiment, and FIG. 2 is a sectional view of the rolling bearing device of the first embodiment. In the scroll compressor shown in FIG. 1, a spiral partition 3 is provided in each of the orbiting scroll member 1 and the fixed scroll member 2, and a compression chamber 4 formed between both spiral partition 3 is provided along with the eccentric rotation of the orbiting scroll member 1. Thus, the compression operation is performed by changing the volume.

  The shaft portion 5 protruding from the lower portion of the orbiting scroll member 1 is connected to the tip of the main shaft rotor 6 via the rolling bearing device 30 of the present embodiment. The main shaft rotor 6 is provided in the motor housing 9. A rotational driving force is given by the stator 11 thus formed. The fixed scroll member 2 is directly attached to one end side of the motor housing 9 without an intermediate housing (reference numeral 12 in FIG. 6).

  The rolling bearing device 30 rotatably supports the shaft portion 5 and the main shaft rotor 6 of the orbiting scroll member 1, and includes a cylindrical roller bearing portion 31 that receives a radial load and an angular ball bearing portion 32 that receives a thrust load in the axial direction. Adjacent to it.

  As shown in FIG. 2, the cylindrical roller bearing portion 31 and the angular ball bearing portion 32 share the inner ring 35, and the first roller roller 41 of the cylindrical roller bearing portion 31 rolls on the outer peripheral surface of the inner ring 35. The inner ring raceway surface 35a and the ball 42 of the angular ball bearing portion 32 have a second inner ring raceway surface 35b.

  On the other hand, the outer rings 33 and 34 of the cylindrical roller bearing portion 31 and the angular ball bearing portion 32 are configured as separate bodies, and first and second outer ring raceway surfaces are provided on the inner peripheral surfaces of the outer rings 33 and 34. 33a and 34a are respectively formed. Between the first inner ring raceway surface 35 a of the inner ring 35 and the first outer ring raceway surface 33 a of the outer ring 33, the cylindrical rollers 41 are arranged so as to roll freely while being held at equal intervals by the cage 43. The balls 42 are arranged between the second inner ring raceway surface 35b of the inner ring 35 and the second outer ring raceway surface 34a of the outer ring 34 so as to be able to roll while being held at equal intervals by the cage 44. ing.

  Further, a first fitting hole 36 for fitting the shaft portion 5 of the orbiting scroll member 1 serving as the first shaft through the slide bearing 8 on the cylindrical roller bearing portion 31 side of the shared inner ring 35. A second fitting hole 37 for fitting the main shaft rotor 6 as the second shaft is communicated with the first fitting hole 36 on the angular ball bearing portion 32 side of the inner ring 35. Is provided. Accordingly, the shaft portion 5 of the orbiting scroll member 1 and the main shaft rotor 6 are connected by the inner ring 35.

  The center axis L1 of the first fitting hole 36 and the center axis L2 of the second fitting hole 37 are eccentric from each other by the amount of eccentricity ε, and the center axis L2 of the second fitting hole 37 is a rolling bearing. The rotation center axis line (rotation center line of the inner ring 35) L of the device 30 is provided. The outer diameter dimension D1 of the outer ring 34 of the angular ball bearing portion 32 is formed smaller than the outer diameter dimension D2 of the outer ring 33 of the cylindrical roller bearing portion 31.

  The slide bearing 8 is press-fitted into either the outer peripheral surface of the shaft portion 5 on the orbiting scroll member 1 side or the inner peripheral surface of the second fitting hole 37 of the inner ring 35, and the other is a clearance fit. Are combined.

  In addition, as shown in FIG. 1, the rolling bearing device 30 is configured such that the cylindrical roller bearing portion 31 side is positioned on the outer side (scroll portion side) in the axial direction in a bearing housing hole 9 a formed on one end side of the motor housing 9. It is accommodated in a state where the angular ball bearing portion 32 side is positioned on the inner side (motor side). The outer ring 33 of the cylindrical roller bearing portion 31 is press-fitted into the inner peripheral surface of the bearing housing hole 9a of the motor housing 9, and the end surface of the outer ring 34 of the angular ball bearing portion 32 is the wall end surface 9b of the bearing housing hole 9a. Abut.

  In the orbiting scroll member 1 and the main shaft rotor 6 assembled in the rolling bearing device 30, the rotation center axis Lb of the main shaft rotor 6 coincides with the rotation center axis L of the rolling bearing device 30, and the center of the shaft portion 5 of the orbiting scroll member 1. The axis line La is decentered from the rotation center axis line Lb of the main shaft rotor 6 by the amount of eccentricity ε. Therefore, when the main shaft rotor 6 rotates, the orbiting scroll member 1 rotates eccentrically with the orbiting radius of the eccentric amount ε.

  Further, the shaft portion 5 of the orbiting scroll member 1 is provided with a flange portion 5a, and the flange portion 5a hits one end face of the inner ring 35 of the rolling bearing device 30 through the flange portion of the slide bearing 8. The thrust load acting on the orbiting scroll member 1 is transmitted to the inner ring 35. The flange 6a of the main shaft rotor 6 is in contact with the other end surface of the inner ring 35. The orbiting scroll member 1 and the main shaft rotor 6 are respectively formed with oil holes 5b and 6c for supplying a lubricant to the scroll portion side of the rolling bearing device 30.

  In the scroll compressor thus configured, when the main shaft rotor 6 rotates, the orbiting scroll member 1 rotates eccentrically with the orbiting radius of the eccentric amount ε, whereby the compression chamber 4 formed between the spiral partition walls 3 is formed. The volume is changed to perform the compression operation. At this time, the radial load generated from the compression chamber 4 is received by the cylindrical roller bearing 31, and the thrust load is received by the angular ball bearing 32.

  Therefore, according to the rolling bearing device 30 of the present embodiment, the cylindrical roller bearing portion 31 that receives the radial load and the angular ball bearing portion 32 that is disposed adjacent to the cylindrical roller bearing portion 31 and receives the thrust load are provided. Therefore, the wear characteristics of the bearing can be improved, and when incorporated in the scroll compressor, the operating efficiency of the scroll compressor can be improved and the life can be extended. Further, the first inner ring raceway surface 35 a on which the roller 41 of the roller bearing portion 31 rolls and the second inner ring raceway surface 35 b on which the ball 42 of the angular ball bearing portion 32 rolls are composed of a single inner ring 35. Since it is formed on each outer peripheral surface, the inner ring 35 is shared, processing becomes easy, and the cost is low.

  The inner ring 35 has a first fitting hole 36 into which the shaft portion 5 of the orbiting scroll member 1 is fitted via the slide bearing 8 and a second fitting into which the tip end of the main shaft rotor 6 is press-fitted. Since the joint hole 37 is formed, the inner ring 35 can function as a shaft joint that connects the main shaft rotor 6 and the shaft portion 5 of the orbiting scroll member 1, and the processing load on the main shaft rotor 6 side (processing to provide an eccentric portion). Can be reduced. Thus, the inner ring 35 can be made to function as a shaft joint while the first and second inner ring raceway surfaces 35a and 35b are formed without increasing the axial length thereof.

  Further, since the center axis L1 of the first fitting hole 36 and the center axis L2 of the second fitting hole 37 are eccentric with each other, the orbiting scroll member 1 and the main shaft rotor 6 are assembled to the rolling bearing device 30. Thus, the orbiting scroll member 1 can be eccentrically rotated by the rotation of the main shaft rotor 6.

  Furthermore, since the outer diameter of the outer ring 34 of the angular ball bearing 32 is smaller than the outer diameter of the outer ring 33 of the cylindrical roller bearing 31, the cylindrical roller is inserted into the bearing receiving hole 9a of the housing 9 having a uniform inner diameter. By fitting the outer ring 33 of the bearing portion 31, a gap can be secured between the inner peripheral surface of the bearing receiving hole 9 a and the outer peripheral surface of the outer ring 34 of the angular ball bearing portion 32, and the angular ball bearing portion 32. It is possible to prevent the radial load from acting on.

(Second Embodiment)
Next, a rolling bearing device according to a second embodiment of the present invention will be described with reference to FIGS. The present embodiment is characterized in that the inner ring 135 of the rolling bearing device 130 used in the scroll compressor is formed as a solid shaft member instead of the cylindrical shape as in the first embodiment. . For this reason, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted or simplified.

  In this rolling bearing device 130, both end portions in the axial direction of the inner ring 135 protrude outward in the axial direction from both end surfaces of the outer rings 33 and 34 of the cylindrical roller bearing portion 31 and the angular ball bearing portion 32, respectively. A fitting hole 136 is formed as a bottomed hole in the end face of the protruding portion on the cylindrical roller bearing portion 31 side of the inner ring 135, and a second fitting hole 137 is a protruding portion on the angular ball bearing portion 32 side of the inner ring 135. It is formed as a bottomed hole in the end surface of the part. The central axis L1 of the first fitting hole 136 and the central axis L2 of the second fitting hole 137 are eccentric from each other by the amount of eccentricity ε, as in the first embodiment.

  Both hole bottom portions 136a, 137a of the first fitting hole 136 and the second fitting hole 137 are outside the both end surfaces of the outer ring 33, 34 of the cylindrical roller bearing portion 31 and the angular ball bearing portion 32, and The inner ring portion between the hole bottom portions 136a and 137a is solid. On the outer peripheral surface of the shared inner ring 135, a first inner ring raceway surface 135a on which the cylindrical rollers 41 roll and a second inner ring raceway surface 135b on which the balls 42 roll are provided.

As described above, the inner ring 135 is configured as a solid shaft member having a solid middle portion in the axial direction in which the balls 42 and the cylindrical rollers 41 are disposed on the outer periphery. As shown in FIG. 3, the inner ring 135 can be incorporated in the role of an intermediate shaft that connects the main shaft rotor 6 and the shaft portion 5 of the orbiting scroll member 1, thereby reducing the dimensions of the main shaft rotor 6 and the orbiting scroll member 1. be able to. In the present embodiment, the inner ring 135, which is an intermediate shaft member, communicates with the oil hole 6c of the main shaft rotor 6 to supply the lubricant to the scroll portion side of the rolling bearing device 30. Is formed.
Other configurations and operations are the same as those of the first embodiment.

(Third embodiment)
Next, a rolling bearing device according to a third embodiment of the present invention will be described with reference to FIG. In addition, about the equivalent part to 2nd Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted or simplified.

As shown in FIG. 5, this rolling bearing device 230 includes both the outer ring 33 and 34 of the cylindrical roller bearing portion 31 and the angular ball bearing portion 32 of the rolling bearing device 130 of the second embodiment as a single outer ring 233. It is characterized by that. That is, the single outer ring 233 has, on its inner peripheral surface, a first outer ring raceway surface 233a on which the cylindrical rollers 41 roll and a second outer ring raceway surface 233b on which the balls 42 roll. Thereby, the structure of the rolling bearing device 230 can be further simplified.
Other configurations and operations are the same as those of the second embodiment.

  In addition, this invention is not limited to the said embodiment, A deformation | transformation, improvement, etc. are possible suitably. For example, in the present embodiment, the case where an angular ball bearing is employed for the ball bearing portion 32 has been described, but a deep groove ball bearing may be employed instead of the angular ball bearing.

It is sectional drawing of the scroll compressor incorporating the rolling bearing apparatus of 1st Embodiment of this invention. It is sectional drawing of the rolling bearing apparatus of 1st Embodiment of this invention. It is sectional drawing of the scroll compressor incorporating the rolling bearing apparatus of 2nd Embodiment of this invention. It is sectional drawing of the rolling bearing apparatus of 2nd Embodiment of this invention. It is sectional drawing of the rolling bearing apparatus of 3rd Embodiment of this invention. It is sectional drawing of the conventional scroll compressor.

Explanation of symbols

5 Shaft portion of the orbiting scroll member (first shaft)
6 Spindle rotor (second shaft)
30, 130, 230 Rolling bearing device 31 Cylindrical roller bearing portion 32 Angular ball bearing portion 33 Outer ring of cylindrical roller bearing portion 34 Outer ring of angular ball bearing portion 35,135 Inner ring 35a First inner ring raceway surface 35b Second inner ring raceway surface 36,136 First fitting hole 37,137 Second fitting hole 233 Outer ring L Rotation center axis of rolling bearing device L1 Center axis of first fitting hole L2 Center axis of second fitting hole D1 Angular Outer diameter of ball bearings for outer transportation D2 Outer diameter of outer ring of cylindrical roller bearings

Claims (5)

A rolling bearing device for supporting a rotating shaft on which a radial load and a thrust load act simultaneously,
A roller bearing that receives the radial load;
A ball bearing portion disposed adjacent to the roller bearing and receiving the thrust load;
With
The first inner ring raceway surface on which the roller of the roller bearing portion rolls and the second inner ring raceway surface on which the ball of the ball bearing portion rolls are formed on the outer peripheral surface of a single inner ring. A rolling bearing device characterized by.   The inner ring has a first fitting hole for fitting the first shaft on the roller bearing portion side, and a second fitting for fitting the second shaft on the ball bearing portion side. The rolling bearing device according to claim 1, wherein a hole is formed.   The rolling bearing device according to claim 2, wherein a center axis of the first fitting hole and a center axis of the second fitting hole are eccentric from each other.   The rolling bearing device according to any one of claims 1 to 3, wherein an outer diameter size of the outer bearing of the ball bearing portion is set smaller than an outer diameter size of the outer ring of the roller bearing portion.   The first outer ring raceway surface on which the roller of the roller bearing portion rolls and the second outer ring raceway surface on which the ball of the ball bearing portion rolls are formed on the inner peripheral surface of a single outer ring. The rolling bearing device according to any one of claims 1 to 4.

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