JP2002333015A - Rotary shaft support structure and rotary shaft support method in apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent application of unnecessary diametral forces to a rotary shaft from three or more radial bearings supporting the rotary shaft. SOLUTION: A first bearing 18 of the three radial bearings 18, 24, and 25 supporting the rotary shaft 17 is supported on a housing 10a by fixing it to a first bearing support part 19 provided on a motor housing 13. The remaining two second bearings 24 and 25 are respectively supported on the housing 10a by fixing them via bearing supports 28 and 36 comprising synthetic resin solidified inside the housing 10a to second bearing support parts 26 and 34 provided on a gear housing 20 united with the motor housing 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating shaft support structure for a rotating device such as a motor, for example.
The present invention relates to a rotating shaft support structure and a rotating shaft supporting method for a device that supports three rotating shafts by three or more radial bearings.

[0002]

2. Description of the Related Art Conventionally, a motor unit used for driving a wiper in a vehicle, for example, has a motor unit 60 and a reduction gear unit 61 integrated as shown in FIG. The housing of such a motor unit is configured by combining a motor housing 62 of the motor section 60 and a gear housing 63 of the reduction gear section 61.

In this motor unit, a rotating shaft 64 of a motor unit 60 is introduced into a gear housing 63, and a worm 65 is fixed to a distal end thereof. The worm 65 is meshed with a worm wheel 67 fixed to an output shaft 66 supported by the gear housing 63.

Therefore, a radial reaction force with respect to the center line of the rotating shaft 64 is applied to the tip of the rotating shaft 64 from the worm wheel 67. Therefore, the tip of the rotating shaft 64 is
5 are respectively supported by radial bearings (hereinafter simply referred to as bearings) 68 and 69. On the other hand, the base end of the rotating shaft 64 is supported by a bearing 70 provided on the motor housing 62.

Each of the bearings 68 to 70 is, for example, a sintered bearing and includes a motor housing 62 or a gear housing 63.
Fixing holes 7 for bearing support portions 71, 72, 73 provided in
Each of the housings 62 and 63 is supported by being press-fitted into each of the housings 1a, 72a and 73a.

To manufacture a motor unit having such a rotating shaft support structure, a separately manufactured motor unit 60 is required.
When the gear and the reduction gear 61 are combined, the bearing support 71
The rotating shaft (armature) 64 is inserted into the bearings 68 to 70 previously assembled and fixed to the bearings 73 to 73. Alternatively, the bearings 68 to 70 mounted on the rotating shaft 64 are fitted into the bearing support portions 71 to 73. Then, the motor unit 60 and the reduction gear unit 61 are integrated by joining the fitting portions 62a and 63a of the motor housing 62 and the gear housing 63 in a state of being fitted.

[0007]

However, there is a dimensional error in the positional relationship between the fitting portion 62a of the motor housing 62 and the fixing hole 71a. Similarly, the fitting portion 6
There is also a dimensional error between 3a and each fixing hole 72a, 73a. Also, there is an assembly error when joining the two housings 62 and 63. For this reason, a state occurs in which the three bearings 68 to 70 that support the rotation shaft 64 are not accurately located on the same rotation center line. As a result, an unnecessary radial force is applied to the rotating shaft 64 from the bearings 68 to 70, and the rotating shaft 64 and the bearings 68 to 70 are operated during operation of the motor.
Noise may occur between the two, and torque characteristics may be abnormal. Further, if the motor is used in a state where stress is applied, the rotating shaft 64 may be broken.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a rotating shaft support structure in a device that supports one rotating shaft by three or more radial bearings. An object is to prevent unnecessary radial force from being applied to the rotating shaft.

[0009]

In order to solve the above-mentioned problems, according to the first aspect of the present invention, three or more radial bearings are fixedly supported on a housing of an apparatus, and each of the bearings forms one rotating shaft. A rotating shaft support structure for a device rotatably supported by a housing, wherein at least one first bearing of the bearings is fixed to a first bearing support provided on the housing. The second bearing other than the first bearing is supported by a bearing support made of a synthetic resin solidified in the housing with respect to a second bearing support provided in the housing. And being supported by the housing by being fixed.

According to the first aspect of the present invention, the second bearing is positioned in the radial direction by the rotating shaft supported by the first bearing and positioned in the radial direction with respect to the housing. It is possible to support the second bearing at the deviated position. For this reason, three or more bearings are respectively positioned in the radial direction with respect to the housing with respect to the rotating shaft supported by the housing, so that it is difficult for the rotating shaft to receive an unnecessary radial force from each bearing. .

According to a second aspect of the present invention, in the first aspect of the present invention, the second bearing support portion has a columnar receiving hole through which the rotary shaft is inserted and which receives the second bearing. The bearing support is filled in a cylindrical space formed between the outer peripheral surface of the non-rotating portion of the second bearing and the inner peripheral surface of the housing hole so as to be continuous around the second bearing. It is characterized by being made of solidified synthetic resin.

According to the invention described in claim 2, according to claim 1
In addition to the effect of the invention described in the above, since the entire outer peripheral surface of the non-rotating portion of the second bearing is supported by the cylindrical support, a specific diameter from the solidified synthetic resin to the second bearing is obtained. It is difficult to apply force in the direction. For this reason, it is hard to be in a state where unnecessary radial force is further applied from each bearing to the rotating shaft supported by three or more bearings.

According to a third aspect of the present invention, in the second aspect of the present invention, the accommodation hole of the second bearing support portion has an inner periphery of the accommodation hole on one side in a center line direction of the rotating shaft. An annular step portion projecting inward from the surface is formed, and an annular flat surface is formed on the periphery of the opening that opens to the other side, and the second bearing has a non-rotating portion in the center line direction. One of both end surfaces is annularly abutted against the stepped portion around the rotation shaft, and the other of the two end surfaces is annularly abutted on the flat surface around the rotation shaft. The support is made of a synthetic resin filled and solidified in a cylindrical space sealed by the step portion and the lid member.

According to the invention described in claim 3, according to claim 2
In addition to the effect of the invention described in (1), the second bearing is positioned in the center line direction by the housing and the lid member, so that the second bearing is easily assembled. In addition, since the cylindrical space portion is sealed by closing the opening with the lid member after the second bearing is housed in the housing hole of the second bearing portion, the synthetic resin before solidification is easily filled. can do.

According to a fourth aspect of the present invention, in the second or third aspect, the outer peripheral surface of the non-rotating portion of the second bearing is provided with the bearing support in a rotational direction with respect to a center line thereof. And a circumferential engaging portion for restricting the relative rotation of the non-rotating portion with respect to the bearing support is formed.

According to the invention described in claim 4, claim 2 is provided.
Alternatively, in addition to the function of the invention described in claim 3, the relative rotation of the non-rotating portion about the center line with respect to the bearing support is strongly restricted. For this reason, the reliability of the support state of the second bearing becomes higher.

According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the second bearing is a sintered bearing, and the circumferential engaging portion is provided with the rotational center line when the sintered bearing is molded. It is characterized by being formed by press molding in one direction.

According to the invention set forth in claim 5, according to claim 4,
In addition to the operation of the invention described in (1), when a sintered bearing is used, a new processing step for forming a circumferential engagement portion on the second bearing is not required.

According to a sixth aspect of the present invention, there is provided a rotary shaft in a device in which three or more radial bearings are fixedly supported on a housing of the device, and one rotary shaft is rotatably supported by the bearings with respect to the housing. A support method,
At least one first bearing of the bearings is fixed to the housing by being supported by a first bearing support provided in the housing, and the remaining first bearings of the respective bearings excluding the first bearing are supported. The two bearings are mounted on the rotary shaft supported by the first bearing fixed to the bearing support, thereby being positioned in the radial direction of the rotary shaft with respect to the housing and positioned in the same radial direction. The second bearing is fixed to the housing via a support made of a synthetic resin solidified so as to fix the non-rotating portion at that position.

According to the sixth aspect of the present invention, the second bearing is positioned in the radial direction by the rotary shaft positioned in the radial direction with respect to the housing by being supported by the first bearing. The second bearing is supported at the position. For this reason, since three or more bearings are respectively positioned in the radial direction with respect to the housing with reference to the rotating shaft supported by the housing, it is difficult for an unnecessary force in the radial direction to be applied to the rotating shaft from each bearing. .

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment in which the present invention is embodied in a motor unit used in, for example, a vehicle wiper device will be described with reference to FIGS.

As shown in FIG. 1, a motor unit 10 as a device includes a motor unit 11 and a reduction gear unit 12. The motor unit 11 is a DC motor and includes a motor housing 13 that forms a part of the housing 10a of the motor unit 10.

A field magnet 14, an armature 15, a brush holder 16, and the like are housed inside the motor housing 13. The armature 15 is supported on a rotating shaft 17,
Is supported by a first bearing 18 fixed in the motor housing 13. The first bearing 18 is a sintered bearing, and is supported by being fitted and fixed in a fixing hole 19 a of a first bearing support portion 19 formed integrally with the motor housing 13. The tip 17b side of the rotating shaft 17 extends from the motor housing 13 to the reduction gear portion 12 side.

The reduction gear section 12 has a gear housing 20 which forms a part of the housing of the motor unit 10,
A worm wheel 21 is provided inside the gear housing 20.
It has. The gear housing 20 includes a fitting portion 20a, and the fitting portion 20a is fitted to the fitting portion 13a of the motor housing 13 to be united with the motor housing 13.

The worm wheel 21 is rotatably supported by the gear housing 20 and has one end rotatably supported by an output shaft 22 extending to the outside. Further, inside the gear housing 20, a tip 17b side of the rotating shaft 17 extending from the motor unit 11 is introduced. Rotary axis 1
A worm 23 is fixed to the tip 17 b side of the worm 7, and the worm 23 is meshed with the worm wheel 21.
The front end 17 b side of the rotating shaft 17 is provided with a worm 2 by two second bearings 24 and 25 supported by the gear housing 20.
3 are supported on both sides.

The second bearing 24 is connected to a second bearing support 26 formed integrally with the gear housing 20 via a bearing support 28 provided in a cylindrical receiving hole 27 of the second bearing support 26. Supported. The bearing support 28 is made of a synthetic resin solidified in the accommodation hole 27. As the synthetic resin, for example, polyoxymethylene which is a thermoplastic resin can be used.

More specifically, as shown in FIGS.
The accommodation hole 27 of the bearing support portion 26 is formed with an annular stepped portion 29 projecting inward from an inner peripheral surface 27 a of the accommodation hole 27 on one side in the center line direction of the rotating shaft 17. In addition, 2 provided on the other side in the direction of the center line of the rotating shaft 17.
An annular flat surface 26a is formed on the periphery of the opening 27b of the seventh.

The second bearing 24 has one end face 24 a in the direction of the center line of the rotary shaft 1 with respect to the stepped portion 29.
7 is annularly abutted around. Also, the other end surface 2
4b, the cover member 30 fixed to the flat surface 26a
7 is annularly abutted around.

The inner peripheral surface 27a of the receiving hole 27 and the second bearing 24
A cylindrical space is formed between the outer peripheral surface 24c and the outer peripheral surface 24c. This space is sealed by the step 29 and the lid member 30. In this space, there is provided a bearing support 28 in which synthetic resin filled in a fluid state through a flow path 32 communicating with the outside of the gear housing 20 is solidified. The bearing support 28 supports the second bearing 24 on the gear housing 20 with the second bearing 24 positioned in the radial direction.

Also, on the outer peripheral surface 24c of the second bearing 24,
An annular step portion 2 that is continuous on the circumference is provided at the end on the end face 24b side.
4d is formed. The bearing support 2 is provided on the step portion 24d.
The stepped portion 28a formed on the inner peripheral surface of No. 8 is engaged.
The step portion 28 a regulates the relative movement of the second bearing 24 toward the motor portion 11 in the direction of the center line with respect to the bearing support 28.

In the region of the outer peripheral surface 24c excluding the step portion 24d, three grooves 24e are formed at equal angular intervals as circumferential engaging portions that extend in the center line direction. Each groove 2
4e is a ridge 2 formed on the inner peripheral surface of the bearing support 28.
8b is engaged. Each of the grooves 24e regulates the relative rotation of the second bearing 24 with respect to the bearing support 28 by the engagement of the ridges 28b. The step 24d and each groove 24e are formed when the second bearing 24 is press-molded.

The lid member 30 is fixed to the flat surface 26a of the second bearing support 26 by three screws 33. As shown in FIGS. 4 and 5, similarly to the second bearing 24, the second bearing 25 is attached to another second bearing support 34 formed integrally with the gear housing 20.
4 is supported via a bearing support 36 provided in the cylindrical accommodation hole 35. The bearing support 36 is provided with the accommodation hole 35.
It consists of a synthetic resin that has solidified within.

The accommodation hole 35 of the second bearing support portion 34 is formed with an annular step 37 protruding inward from the inner peripheral surface 35 a of the accommodation hole 35 on one side in the center line direction of the rotating shaft 17. I have. Also, on the periphery of the opening 35b of the housing hole 35 provided on the other side in the direction of the center line of the rotating shaft 17,
An annular flat surface 34a is formed.

The second bearing 25 has one end face 25 a in the direction of the center line of the rotary shaft 1 with respect to the step portion 37.
7 is annularly abutted around. Also, the other end surface 2
The cover member 38 fixed to the flat surface 34a at 5b
7 is annularly abutted around.

The inner peripheral surface 35a of the receiving hole 35 and the second bearing 25
A cylindrical space is formed between the outer peripheral surface 25c and the outer peripheral surface 25c. This space is sealed by a step 37 and a lid member 38. In this space, there is provided a bearing support 36 in which synthetic resin filled in a flowing state is solidified through a flow path 40 communicating with the outside of the gear housing 20. The bearing support 36 supports the second bearing 25 in the gear housing 20 in a state of being positioned in the radial direction.

On the outer peripheral surface 25c of the second bearing 25,
An annular step portion 2 that is continuous on the circumference is provided at the end on the end face 25b side.
5d is formed. The bearing support 3 is provided on the step 25d.
The stepped portion 36a formed on the inner peripheral surface of No. 6 is engaged.
The stepped portion 36a regulates the relative movement of the second bearing 25 toward the motor portion 11 in the direction of the center line with respect to the bearing support 36.

In the area of the outer peripheral surface 25c excluding the step 25d, three grooves 25e are formed at equal angular intervals as circumferential engaging portions extending in the center line direction. Each groove 2
5e is a ridge 3 formed on the inner peripheral surface of the bearing support 36.
6b is engaged. The grooves 25e regulate the relative rotation of the second bearing 25 with respect to the bearing support 36 by the engagement of the ridges 36b. The steps 25d and the grooves 25e are formed when the second bearing 25 is press-molded.

The cover member 38 is fixed to the flat surface 34a of the second bearing support 34 by three screws 41. Next, a rotating shaft supporting method for manufacturing such a rotating shaft supporting structure will be described.

When assembling the motor unit 10, first,
The first bearing 18 is fitted and fixed to the first bearing support 19 of the motor housing 13. Next, the fitting portion 13a of the motor housing 13 is fitted to the fitting portion 2 of the gear housing 20.
The two housings 13 and 20 are combined by fitting 0a. At this time, the base end 17 a of the rotating shaft 17 is inserted through the first bearing 18 fixed to the motor housing 13. Also,
The second bearing 24 previously incorporated in the receiving hole 27 of the second bearing support 26, and the second bearing support 34
The rotary shaft 17 is inserted through the second bearing 25 incorporated in the receiving hole 35 from the tip 17b side.

As a result, the rotating shaft 17 is supported by the first bearing 18 and positioned with respect to the formed housing 10a. The rotation shaft 17 allows the second bearing 2
4 and 25 are positioned in the radial direction in the receiving holes 27 and 35 of the second bearing support portions 26 and 34, respectively.

Next, the second bearing support 2
The synthetic resin in a flowing state is injected into the accommodation hole 27 of No. 6 and filled in the space 31 to be solidified. Then, the second bearing 24 positioned in the radial direction is supported at that position by the bearing support 28 in which the synthetic resin is solidified. Similarly,
The synthetic resin in a flowing state is injected into the accommodation hole 35 of the second bearing support portion 34 through the flow path 40, and is filled into the space portion 39 and solidified. Then, the second bearing 2 positioned in the radial direction by the bearing support 36 in which the synthetic resin is solidified.
5 is supported in that position.

Next, the effects of the present embodiment are listed. (1) The housing 1 is supported by the first bearing 18.
The second bearings 24 and 25 are positioned in the radial direction by the rotary shaft 17 positioned in the radial direction with respect to the shaft 0a.
Each of the second bearings 24 and 25 is supported at the positioned position. For this reason, the housing 1 of the motor unit 10
0a, three bearings 1 based on the rotating shaft 17 supported
8, 25, 26 are positioned in the radial direction with respect to the housing 10a.
It is hard to be in a state where an unnecessary radial force is applied from 8, 24, 25.

As a result, for example, noise is less likely to occur between the rotating shaft 17 and each of the bearings 18, 24, 25 during operation of the motor. Further, the torque characteristics of the motor are unlikely to be abnormal. (2) Outer peripheral surface 24c (25) of second bearing 24 (25)
c) Since the entire circumference is supported by the bearing support 28 (36) made of synthetic resin solidified in a cylindrical shape, unnecessary force in the specific radial direction is applied to the second bearing 24 (25) from the solidified synthetic resin. It is even harder to join. Therefore, each bearing 18, 2
Unnecessary radial force can be prevented from being further applied to the rotating shaft 17 from the rotation shafts 4 and 25.

(3) Since the second bearing 24 (25) is positioned in the center line direction by the gear housing 20 and the lid member 30 (38), the second bearing 24 (25) can be easily assembled. After the second bearing 24 (25) is accommodated in the accommodation hole 27 (35) of the second bearing support 26 (34), the opening 27b (35b) is closed by the lid member 30 (38) to form a cylindrical shape. Since the space 31 (39) is in a sealed state, the synthetic resin before solidification is easily filled.

(4) Outer peripheral surface 2 of second bearing 24 (25)
The groove 24e (25e) provided in the bearing support 28 (36) engages with the inner peripheral surface of the bearing support 28 (36).
8 (36) is firmly regulated. For this reason, the reliability of the supporting and fixing state of the second bearing becomes higher, and for example, the second bearing 24 (25) rotates with respect to the bearing support 28 (36) even when an external impact is applied to the motor unit. It is hard to be.

(5) End surface 24 of second bearing 24 (25)
b (25b) side annular step portion 24d continuous on the circumference
(25d), the step 28a (36a) of the bearing support 28 (36) engages in the center line direction, and the center line of the second bearing 24 (25) with respect to the bearing support 28 (36). Strongly restrict relative movement in the direction. For this reason, the reliability of the support state of the second bearing 24 (25) in the center line direction is further improved.

(6) Second bearing 24 made of sintered bearing
Since the step portion 24d (25d) and each groove 24e (25e) are formed at the time of the press forming of (25), a new processing step is not required.

(7) Since the second bearing 24 (25) is supported by the housing via the bearing support 28 (36) made of synthetic resin that is easily elastically deformed, the second bearing 24 (25) Rotary shaft 17 generated by radial play
The vibration in the radial direction is buffered, and the generation of vibration noise is suppressed.

(8) After the motor unit 10 is assembled, the synthetic resin forming the bearing support 28 is supplied to the second bearing support 26 and the second bearing 24 from the outside of the housing via the flow path 32 provided in the housing. The space 31 formed between them is filled. For this reason, the work of filling the synthetic resin in a fluid state becomes easy.

Next, an embodiment other than the above-mentioned embodiment will be described in an itemized manner. In the above embodiment, as shown in FIG. 5, two first bearings 18, 42 of the three bearings 18, 24, 42 supporting the rotating shaft 17 are provided integrally with the housings 13, 20. Fixing holes 19a, 4 in first bearing support portions 19, 43
3a, it is fixed to the housing 10a. The other second bearing 24 is provided on the second bearing support 26 provided in the gear housing 20 with a bearing support 28 made of synthetic resin solidified in a receiving hole 27 of the second bearing support 26. And is fixed to the housing 10a.

Even in this case, the two first bearings 1
The second bearing 24 is positioned in the radial direction by the rotating shaft 17 which is positioned in the radial direction by being supported by 8, 42, and the second bearing 24 is supported at this position. For this reason,
Unnecessary radial forces are applied to the rotating shaft 17 from the bearings 18, 24, 42.

In the above embodiment, the second bearing support 26
Are formed in a columnar shape having no stepped portion 28a, and lid members are respectively attached and fixed to the respective openings that are opened on both sides in the center line direction. Each end face of the second bearing 24 accommodated in the accommodation hole 27 has a lid member annularly abutting around the rotation shaft 17. The bearing support 28 is made of a synthetic resin which is filled and solidified in a cylindrical space sealed by both lid members.

With such a configuration, the second bearing 24
Is easy to assemble. Further, the synthetic resin in a fluidized state can be easily filled. In the above-described embodiment, the synthetic resin forming the bearing support 28 is supplied from the opening 27 b to the accommodation hole 2 before the second bearing 24 is accommodated in the accommodation hole 27 when the motor unit 10 is assembled.
After the second bearing 24 is incorporated into the receiving hole 27, the second bearing 24 is solidified while being filled in the space 31. Alternatively, after the second bearing 24 is housed in the housing hole 27, the second bearing 24 is injected into the housing hole 27 from the opening 27 b and solidified while being filled in the space 31. In this case as well, the rotating shaft 17 supported at a predetermined position with respect to the housing 10a.
Are positioned radially with respect to each other.

Hereinafter, the technical ideas grasped from each of the above embodiments will be described together with their effects. (1) In the invention described in claim 2 or 3,
The outer circumferential surface of the non-rotating portion of the second bearing is axially engaged with the bearing support in the direction of its center line to restrict the relative rotation of the non-rotating portion in the direction of the center line with respect to the bearing support. A rotating shaft support structure in a device, wherein a joining portion (step portions 24d, 25d) is formed. According to such a configuration, the relative movement of the non-rotating portion with respect to the bearing support in the center line direction is strongly restricted, so that the reliability of the support state of the second bearing is further improved.

[0055]

According to the first to sixth aspects of the present invention, in a rotating shaft support structure for a device that supports one rotating shaft by three or more radial bearings, each bearing has a diameter relative to the rotating shaft. Unnecessary force in the direction can be prevented from being applied.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a motor unit showing a support structure of a rotating shaft according to an embodiment.

FIG. 2 is a schematic sectional view showing a support structure of the bearing.

FIG. 3 is a schematic sectional view taken along line AA in FIG. 2;

FIG. 4A is a schematic cross-sectional view showing a bearing support structure;
(B) is a schematic cross-sectional view taken along line BB of (a).

FIG. 5 is a schematic cross-sectional view of a motor unit showing a rotation shaft support structure according to another embodiment.

FIG. 6 is a schematic sectional view of a motor unit showing a conventional rotating shaft support structure.

[Explanation of symbols]

Reference numeral 10: a motor unit as a device; 10a: a housing; 13, a motor housing constituting a housing;
7: rotating shaft, 18: first bearing, 19: first bearing support,
Reference numeral 20 denotes a gear housing constituting a housing; 24, a second bearing; 24c, an outer peripheral surface; 24d, a step portion as an axial engaging portion; 24e, a groove as a circumferential engaging portion; 25, a second bearing; ... outer peripheral surface, 25d ... step portion as an axial direction engaging portion, 25e ... groove as a circumferential direction engaging portion, 26 ... second bearing support portion, 26a ... flat surface, 27 ... accommodation hole, 27a
... inner peripheral surface, 28 ... bearing support, 28a ... stepped portion, 30 ...
Lid member, 31 space part, 34 second bearing support part, 34a
... flat surface, 35 ... accommodation hole, 35a ... inner peripheral surface, 36 ... bearing support, 36a ... stepped portion, 38 ... lid member, 39 ... space portion.

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) // H02K 7/116 H02K 7/116 5H607 F term (reference) 3D025 AE02 3J011 AA02 BA02 DA02 KA02 SB19 SC01 3J012 AB03 AB05 BB01 BB02 CB04 CB10 DB20 FB01 3J017 AA03 DA02 DB10 5H605 BB05 BB09 CC04 EB06 EB16 EB17 FF06 GG18 5H607 AA04 BB01 BB04 BB14 CC01 CC03 DD19 EE32 GG01 GG09 JJ01 KK07

Claims (6)

[Claims] 1. A rotary shaft support structure in a device in which three or more radial bearings are fixedly supported on a housing of the device, and each of the bearings supports one rotary shaft rotatably with respect to the housing, At least one first bearing among the bearings is supported by the housing by being fixed to a first bearing support portion provided on the housing, and a second one of the bearings other than the first bearing is removed. The bearing is supported by the housing by being fixed to a second bearing support portion provided on the housing via a bearing support made of a synthetic resin solidified in the housing. Shaft support structure. 2. The second bearing support portion has a columnar receiving hole through which the rotating shaft is inserted and the second bearing is received, and the bearing support member has an outer peripheral surface of a non-rotating portion of the second bearing. The second space is formed in a cylindrical space formed between
The rotating shaft support structure for an apparatus according to claim 1, wherein the rotating shaft supporting structure is made of a synthetic resin that is filled and solidified so as to be continuous around the bearing. 3. The second bearing support portion has an annular step formed on one side in the direction of the center line of the rotating shaft and extending inward from the inner peripheral surface of the housing hole, and on the other side. An annular flat surface is formed on the periphery of the opening that opens, and one of both end surfaces of the non-rotating portion in the center line direction of the non-rotating portion abuts on the stepped portion annularly around the rotating shaft. And a lid member fixed to the flat surface is abutted on the other of the two end surfaces in a ring around the rotation axis, and the bearing support is a cylindrical member sealed by the step portion and the lid member. 3. The rotating shaft supporting structure in an apparatus according to claim 2, wherein the rotating shaft supporting structure is made of a synthetic resin filled in a space and solidified. 4. An outer peripheral surface of a non-rotating portion of the second bearing,
3. A circumferential engaging portion which engages with the bearing support in a rotational direction with respect to the center line and regulates relative rotation of the non-rotating portion with respect to the bearing support is formed.
Or a rotating shaft support structure in the device according to claim 3. 5. The second bearing is a sintered bearing, and the circumferential engaging portion is formed by press-molding in the direction of the rotation center line at the time of molding the sintered bearing. A rotating shaft support structure in the device according to claim 4. 6. A method of supporting a rotating shaft in a device in which three or more radial bearings are fixedly supported on a housing of the device, and each of the bearings rotatably supports one rotating shaft with respect to the housing. At least one first bearing among the bearings is supported by the housing by being fixed to a first bearing support portion provided in the housing, and a second one of the bearings other than the first bearing is removed. The bearing is mounted on the rotary shaft supported by the first bearing fixed to the bearing support, thereby being positioned in the radial direction of the rotary shaft with respect to the housing and positioned in the same radial direction. A rotary shaft support in a device, which is fixed to the housing via a support made of a synthetic resin solidified so as to fix the non-rotating portion of the second bearing at that position. Law.