JP2002136037A - Structure of bearing for rotating shaft of motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing structure of a motor capable of enhancing the fixing force of a member arranged at the edge in the direction of the axis of a bearing in order to stand the thrust load of a rotating shaft by eliminating the necessity for upsizing a bearing section in the direction of the axis. SOLUTION: The structure includes: a bearing 5 fixed at a housing 4 to stand the radial load of a rotating shaft 2; an output gear 7 press-inserted into the rotating shaft 2 at the outside of the direction of the axis of the bearing 5 and transferring the driving force of a motor 1 to the side of the load; and a collar 3 press-inserted into the rotating shaft 2 and comprising: a flange 3b mounted so as to hold the bearing 5 to the direction of the axis in cooperation with the output gear 7 to stand the thrust load of the rotating shaft 2 at the inside of the direction of the axis of the bearing 5; and an extending part 3a extending from the flange 3b along the rotating shaft 2 and inserted into the bearing 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor bearing structure.

[0002]

2. Description of the Related Art FIG. 4 shows a bearing portion of a conventional motor 51. As shown in FIG.
2 is rotatably supported by a substantially cylindrical metal bearing 54 fixed to the housing 53, and the bearing 54 is
2 radial load.

[0003] A substantially cylindrical output gear 55 for transmitting the driving force of the motor 51 to the load side is provided at the tip of the rotating shaft 52.
Is press-fitted. The output gear 55 and the metal bearing 54
Two washers 56 are interposed between the axially outer ends of the two to facilitate relative rotation between them.

[0004] A substantially cylindrical collar 57 is press-fitted on the opposite side of the output gear 55 across the metal bearing 54 of the rotary shaft 52. Two washers 58 are interposed between the collar 57 and the inner end of the metal bearing 54 in the axial direction to facilitate relative rotation between them. The collar 57 and the output gear 55 are provided so as to sandwich the metal bearing 54 in the axial direction, and both members receive a thrust load of the rotating shaft 52.

[0005]

However, when the motor 51 having the above structure is used by attaching it to a portion that vibrates relatively large, particularly a portion that vibrates largely in the axial direction of the rotary shaft 52, the motor 51 is pressed into the rotary shaft 52. Output gear 55 fixed
Further, it is necessary to secure a sufficient fixing force of the collar 57. If the fixing force is insufficient, the output gear 55 and the collar 57 relatively move in the axial direction due to the vibration in the axial direction, so that the interval between them increases. Then, not only the backlash in the axial direction of the rotating shaft 52 is increased and vibration and noise are increased, but also troubles such as disconnection in the motor 51 may occur.

In order to increase the fixing force of the output gear 55 and the collar 57, it is conceivable to increase the press-fitting margin and improve the fixing force. However, this causes a problem that the assembly becomes difficult and is not an advantageous measure. . For this reason, it has been considered that both members are extended in the axial direction to increase the contact area with the rotating shaft 52 to improve the fixing force.

Here, the output gear 55 is a member that transmits a driving force to a load, and thus is formed relatively large in the axial direction, and has a large contact area with the rotating shaft 52 and a large fixing force. In addition, since the output gear 55 is a portion exposed from the housing 53, even if the output gear 55 is enlarged in the axial direction, there is no problem.

[0008] However, the collar 57 is
When the collar 57 is enlarged in the axial direction because it is a member disposed in the housing 3, the bearing 54 is mounted in order to avoid interference with other motor components (for example, a commutator, etc.) in the housing 53 in FIG. Must be arranged further axially outward than the position shown in FIG. Therefore, the size of the housing 53 (the main body of the motor 51) increases in the axial direction.

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 bearing for receiving a thrust load of a rotating shaft while preventing the bearing portion from being enlarged in the axial direction. An object of the present invention is to provide a motor bearing structure capable of improving the fixing force of a member disposed at an axial end of the motor.

[0010]

In order to solve the above-mentioned problems, the invention according to claim 1 is fixed to a housing,
A bearing that receives a radial load on the rotating shaft, an output member that is press-fitted to the rotating shaft on the outside in the axial direction of the bearing and transmits the driving force of the motor to the load side, and a thrust of the rotating shaft on the inside in the axial direction of the bearing. A flange portion provided to cooperate with the output member to hold the bearing in the axial direction so as to receive a load, and an extension portion extending from the flange portion along the rotation axis and inserted into the bearing. And a collar press-fit into the rotating shaft.

According to a second aspect of the present invention, there is provided a bearing fixed to a housing and receiving a radial load of a rotary shaft, and an output member disposed axially outside the bearing and transmitting a driving force of a motor to a load side. A flange portion provided to cooperate with the output member to hold the bearing in the axial direction in order to receive a thrust load of the rotating shaft on the inner side in the axial direction of the bearing, and from the flange portion to the rotating shaft. An extension extending through the bearing and protruding to the opposite side of the bearing and projecting to the opposite side of the bearing, and having an extending portion into which the output member is press-fitted, and a collar press-fitted into the rotary shaft.

According to a third aspect of the present invention, there is provided a bearing fixed to a housing and receiving a radial load of a rotary shaft, and a drive transmitting portion disposed axially outside the bearing and transmitting a driving force of a motor to a load side. An extension member extending along the rotation shaft from the drive transmission portion, penetrating through the bearing and protruding to the opposite side of the bearing, and an output member press-fitted into the rotation shaft; A collar which is press-fitted to a portion of the extension portion protruding from the bearing on the inner side in the axial direction, and is provided so as to cooperate with the output member to axially clamp the bearing in order to receive a thrust load of the rotating shaft. And with.

According to a fourth aspect of the present invention, there is provided a bearing structure for a rotary shaft in a motor according to any one of the first to third aspects, wherein the rotary shaft, the output member and the collar are connected to each other. One of them was welded.

(Operation) According to the first aspect of the present invention,
The contact area between the collar and the rotating shaft is increased by the provision of the extension portion on the collar, so that the fixing force of the collar can be improved. Therefore, even when the rotating shaft vibrates greatly in the axial direction, it is possible to prevent the output member and the collar from moving relatively in the axial direction and to increase the distance between the output member and the collar. Rattle can be prevented. Moreover,
Since the extension is inserted into the bearing, it is possible to prevent the housing (motor body) from being enlarged in the axial direction.

According to the second aspect of the present invention, the contact area between the collar and the rotating shaft is increased by the provision of the extending portion on the collar, so that the fixing force of the collar can be improved. Therefore, even when the rotating shaft vibrates greatly in the axial direction, it is possible to prevent the output member and the collar from moving relatively in the axial direction and to increase the distance between the output member and the collar. Rattle can be prevented. In addition, since the extension is inserted through the bearing, it is possible to prevent the housing (motor body) from increasing in size in the axial direction.

According to the third aspect of the present invention, the extension of the output member into which the collar is press-fitted has a larger diameter than the rotary shaft, so that the contact area between the collar and the extension is smaller than that of the related art. Larger than the contact area between the collar and the rotating shaft. Therefore, the fixing force of the collar can be improved. Therefore,
Even when the rotating shaft vibrates greatly in the axial direction, it is possible to prevent the output member and the collar from moving relatively in the axial direction and to increase the distance between each other. Sticking can be prevented. Moreover, since it is not necessary to increase the size of the collar in the axial direction, it is possible to prevent the housing (motor body) from increasing in size in the axial direction.

According to the invention described in claim 4, the rotating shaft,
Since welding is performed between any of the connection portions of the output member and the collar, the fixing force between the connection portions can be further improved.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A first embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a bearing portion of a motor 1 according to the present embodiment. As shown in FIG.
A substantially cylindrical collar 3 is fixed to the, and the rotating shaft 2 is rotatably supported by a substantially cylindrical metal bearing 5 fixed to a housing 4 via the collar 3. This metal bearing 5 receives the radial load of the rotating shaft 2 via the collar 3.

More specifically, the collar 3 has a cylindrical extension 3a having an axial length substantially equal to that of the metal bearing 5;
And a flange portion 3b projecting radially at an axial end of the extension portion 3a. The extension portion 3a is press-fitted and fixed to the rotating shaft 2 so that the extension portion 3a faces outward in the axial direction of the motor 1. ing. The extension 3 a is inserted into the metal bearing 5, and its outer peripheral surface is in sliding contact with the inner peripheral surface of the metal bearing 5. Two washers 6 are interposed between the flange portion 3b and the axially inner end of the metal bearing 5 to facilitate mutual relative rotation.

A substantially cylindrical output gear 7 for transmitting the driving force of the motor 1 to the load side is press-fitted and fixed to the tip of the rotating shaft 2. Between the output gear 7 and the extension 3a of the collar 3 and the axially outer end of the metal bearing 5,
Two washers 8 are interposed for smoothing relative rotation between each other. The output gear 7 and the flange 3b of the collar 3 are provided so as to sandwich the metal bearing 5 in the axial direction, and both members receive a thrust load of the rotating shaft 2.

In this way, the extension 3a is attached to the collar 3.
The contact area between the collar 3 and the rotating shaft 2 is increased by the provision of the above, so that the fixing force of the collar 3 can be improved. Therefore, even when the rotating shaft 2 vibrates largely in the axial direction, it is possible to prevent the output gear 7 and the collar 3 from moving relatively in the axial direction and widening the interval therebetween, and the rotating shaft 2
In the axial direction can be prevented. Moreover,
Since the extension 3a is inserted into the metal bearing 5,
It is possible to prevent the housing 4 (the main body of the motor 1) from being enlarged in the axial direction.

Further, since the inner diameter of the bearing 5 is larger than the inner diameter of the conventional bearing 54, the load per unit received on the inner peripheral surface of the bearing 5 can be made smaller than in the conventional case. Therefore,
This can contribute to extending the life of the bearing 5. In the present embodiment, the number of components does not increase, which can contribute to cost reduction.

The predetermined portion A1 between the rotating shaft 2 and the collar 3 and the predetermined portion A2 between the rotating shaft 2 and the output gear 7 may be welded. By doing so, the fixing force of the collar 3 and the output gear 7 is further improved.

(Second Embodiment) Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. FIG. 2 shows a bearing portion of the motor 11 of the present embodiment. In the present embodiment, the collar 12 is further extended in the axial direction as compared with the first embodiment.

That is, the collar 12 has a cylindrical extension 12a which is longer than the metal bearing 5 in the axial direction, and a flange 12b which projects radially at an axial end of the extension 12a.
And the extension portion 12a is connected to the motor 11
Is press-fitted into the rotating shaft 2 so as to face outward in the axial direction. The extending portion 12a penetrates the metal bearing 5, and the outer peripheral surface of the extending portion 12a is in sliding contact with the inner peripheral surface of the metal bearing 5. A substantially cylindrical output gear 13 for transmitting the driving force of the motor 11 to the load side is press-fitted and fixed to a portion of the extension 12a protruding from the metal bearing 5.
As in the first embodiment, the output gear 13 and the flange portion 12b of the collar 12 are provided so as to sandwich the metal bearing 5 in the axial direction.
Of the thrust load.

Even in this case, the extension 1 is attached to the collar 12.
Since the contact area between the collar 12 and the rotating shaft 2 is increased by the provision of 2a, the fixing force of the collar 12 can be improved. Since the collar 12 of the present embodiment is longer in the axial direction than the collar 3 of the first embodiment, the fixing force is greater. Therefore, even when the rotating shaft 2 vibrates largely in the axial direction, it is possible to prevent the output gear 13 and the collar 12 from moving relatively in the axial direction and widening the mutual interval. In the axial direction can be prevented. Moreover, since the extending portion 12a is inserted into the metal bearing 5, the housing 4 (the main body of the motor 11) can be prevented from being enlarged in the axial direction.

Further, in the present embodiment, it is possible to make the bearing portion composed of the output gear 13, the collar 12, the bearing 5 and the washers 6, 8 into a sub-assembly. Therefore, the assembly process of the motor 11 can be simplified.

Further, similarly to the above embodiment, since the inner diameter of the bearing 5 is larger than the inner diameter of the conventional bearing 54,
The load per unit received by the inner peripheral surface can be made smaller than before. Therefore, it is possible to contribute to extending the life of the bearing 5. Also in this embodiment, the number of components does not increase, which can contribute to cost reduction.

In this embodiment, welding may be performed at a predetermined portion A11 between the rotating shaft 2 and the collar 12 or at a predetermined portion A12 between the collar 12 and the output gear 13.
By doing so, the fixing force of the collar 12 and the output gear 13 is further improved.

(Third Embodiment) Hereinafter, a third embodiment of the present invention will be described with reference to the drawings. FIG. 3 shows a bearing portion of the motor 21 of the present embodiment. In the present embodiment, contrary to the second embodiment, the output gear 22 has a shape extending to a portion where the collar 23 is fixed.

That is, the output gear 22 includes a gear portion 22a,
And a cylindrical extension 22b which is longer than the metal bearing 5 in the axial direction from the gear portion 22a.
2 b is press-fitted and fixed to the rotating shaft 2 so as to face inward in the axial direction of the motor 21. The extending portion 22b penetrates the metal bearing 5, and the outer peripheral surface of the extending portion 22b is in sliding contact with the inner peripheral surface of the metal bearing 5. Metal bearing 5 of extension 22b
A cylindrical collar 23 is press-fitted and fixed to a portion protruding from the cylindrical collar 23. As in the above embodiments, the output gear 22 and the collar 23 are provided so as to sandwich the metal bearing 5 in the axial direction, and receive the thrust load of the rotating shaft 2 by both members.

Even in this case, the extension 22b of the output gear 22, into which the collar 23 is press-fitted, has a larger diameter than the rotating shaft, so that the contact area between the collar 23 and the extension 22b is smaller than that of the prior art. Is larger than the contact area between the collar 57 and the rotating shaft 52. Therefore, the fixing force of the collar 23 can be improved. Therefore, even if the rotating shaft 2 vibrates greatly in the axial direction, the output gear 22 and the collar 23
Can be prevented from moving relative to each other in the axial direction to increase the distance between each other, and rattling in the axial direction of the rotating shaft 2 can be prevented. Moreover, since it is not necessary to increase the size of the collar 23 in the axial direction, it is possible to prevent the housing 4 (motor 21 main body) from increasing in size in the axial direction.

Further, in the present embodiment, a sub-assembly of the bearing portion including the output gear 22, the collar 23, the bearing 5, and the washers 6 and 8 can be realized. Therefore, the assembly process of the motor 21 can be simplified.

Further, similarly to the above-described embodiment, the inner diameter of the bearing 5 is larger than the inner diameter of the conventional bearing 54.
The load per unit received by the inner peripheral surface can be made smaller than before. Therefore, it is possible to contribute to extending the life of the bearing 5. Also in this embodiment, the number of components does not increase, which can contribute to cost reduction.

In this embodiment, welding may be performed at a predetermined portion A21 between the rotary shaft 2 and the output gear 22, or at a predetermined portion A22 between the output gear 22 and the collar 23. By doing so, the fixing force of the collar 23 and the output gear 22 is further improved.

Incidentally, each embodiment of the present invention may be modified as follows. In the above embodiments, the metal bearing 5 is used as the bearing that receives only the radial load of the rotary shaft 2, but other sliding bearings may be used. Further, for example, a needle bearing may be used instead of the slide bearing.

In the above embodiments, the output gears 7, 1
The extension portions 3a, 12a, and 22b are provided on one of the collars 3, 22, and the collars 3, 12, and 23. The extension portions are provided on the output gears 7, 13, 22 and the collars 3, 12, and 23, respectively. It may be provided.

In the above embodiments, two washers 6 and 8 are provided, but the number of washers is not limited to this and may be omitted. In each of the above embodiments, the rotating shaft 2, the output gears 7, 13,
Although welding is performed between the connecting portions of the collar 22 and the collars 3, 12, and 23, the welding need not be performed.

In each of the above embodiments, the output gears 7, 13, 2 are used as output members for transmitting the driving force of the motor to the load side.
Although described as 2, a member other than a gear that transmits the driving force of the motor to the load side may be used.

In the above embodiments, the present invention is applied to the bearing structure of the rotating shaft 2 in the motor, but may be applied to the bearing structure of the rotating shaft other than the motor. The technical ideas other than the claims that can be understood from the above embodiments are described below.

(B) The bearing structure of a rotary shaft in a motor according to any one of claims 1 to 4, wherein the output member is a gear.

(B) A bearing fixed to a member to be mounted and receiving a radial load of a rotating shaft, a first member press-fitted into the rotating shaft on one side of the bearing in the axial direction, and another side of the bearing in the axial direction. A flange portion provided to cooperate with the first member to receive the thrust load of the rotating shaft in the axial direction, and a flange portion extending along the rotating shaft from the flange portion and extending inside the bearing. And a second member press-fitted into the rotary shaft. With this configuration, the contact area between the connecting members of the second member is increased by the extending portion, so that the fixing force can be improved. In addition, since the extending portion is inserted into the bearing, it is possible to prevent the bearing portion from being enlarged in the axial direction.

(C) a bearing fixed to a member to be mounted and receiving a radial load on a rotating shaft, a first member disposed on one side of the bearing in the axial direction, and the rotating shaft on the other axial side of the bearing; A flange portion provided to cooperate with the first member to axially clamp the bearing to receive the thrust load, and extending from the flange portion along the rotation axis and passing through the bearing. An extension that projects to the opposite side of the bearing and into which the first member is press-fitted,
A bearing member for the rotating shaft, comprising: a second member press-fitted into the rotating shaft. According to this configuration, the contact area between the connecting members of the first and second members is increased by the extending portions, so that the fixing force can be improved. In addition, since the extending portion is inserted into the bearing, it is possible to prevent the bearing portion from being enlarged in the axial direction.

(D) A bearing fixed to a member to be mounted and receiving a radial load on the rotating shaft, and a bearing which is pressed into the rotating shaft on both axial sides of the bearing and cooperates with each other to receive a thrust load on the rotating shaft. First and second flanges provided so as to hold the bearing in the axial direction by operating, and extending portions extending from the flange along the rotation axis and inserted into the bearing. A bearing structure for a rotating shaft, comprising: According to this configuration, the contact area between the connecting members of the first and second members is increased by the extending portions, so that the fixing force can be improved.
In addition, since the extending portion is inserted into the bearing, it is possible to prevent the bearing portion from being enlarged in the axial direction.

[0046]

As described in detail above, according to the present invention,
Provided is a motor bearing structure capable of improving the fixing force of a member disposed at an axial end of a bearing to receive a thrust load of a rotating shaft while preventing the bearing portion from being enlarged in the axial direction. can do.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a bearing portion of a motor according to a first embodiment.

FIG. 2 is a cross-sectional view illustrating a bearing portion of a motor according to a second embodiment.

FIG. 3 is a sectional view showing a bearing portion of a motor according to a third embodiment.

FIG. 4 is a sectional view showing a bearing portion of a conventional motor.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Motor, 2 ... Rotary shaft, 3 ... Collar, 3a ... Extension part,
3b: Flange portion, 4: Housing, 5: Metal bearing as bearing, 7: Output gear as output member, 11: Motor, 12: Collar, 12a: Extension, 12b: Flange portion, 13: As output member , An output gear as an output member, 22a as a gear portion as a drive transmitting portion, 22b as an extension portion, and 23 as a collar.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3J017 AA02 CA06 DA01 DB10 5H605 BB05 BB15 CC04 CC05 CC08 DD05 EB03 EB05 EB08 EB17 EB38 5H607 AA01 BB01 CC03 DD02 DD03 DD07 DD09 EE32 EE60 FF02 FF21 GG01 GG02 GG03

Claims (4)

[Claims] 1. A bearing fixed to a housing and receiving a radial load of a rotating shaft; and a press-fitted to the rotating shaft at an axially outer side of the bearing;
An output member for transmitting the driving force of the motor to the load side; and an axially inner side of the bearing provided to cooperate with the output member to receive the thrust load of the rotating shaft so as to sandwich the bearing in the axial direction. A flange having a flange portion extending from the flange portion along the rotary shaft and being inserted into the bearing, and a collar press-fitted into the rotary shaft. Rotary shaft bearing structure. 2. A bearing fixed to a housing and receiving a radial load on a rotating shaft; an output member disposed axially outside the bearing to transmit a driving force of a motor to a load side; A flange portion provided to cooperate with the output member to receive the thrust load of the rotating shaft in the axial direction, and a flange portion provided along the rotating shaft from the flange portion to extend inside the bearing. And a collar that is inserted into and protrudes to the opposite side of the bearing and protrudes into the protruding portion, at which the output member is press-fitted. Shaft bearing structure. 3. A bearing fixed to a housing and receiving a radial load of a rotating shaft; a drive transmitting unit disposed axially outside the bearing to transmit a driving force of a motor to a load side; An output member that extends along the rotation shaft and extends through the bearing and protrudes to the opposite side of the bearing, and an output member that is press-fitted into the rotation shaft; A collar that is press-fitted into a portion of the portion that protrudes from the bearing, and that is provided to cooperate with the output member to hold the bearing in the axial direction so as to receive a thrust load of the rotating shaft. Bearing structure of the rotating shaft in the motor. 4. The bearing structure for a rotary shaft in a motor according to claim 1, wherein any one of the rotary shaft, the output member, and each of the connecting portions of the collar is welded. A bearing structure for a rotating shaft in a motor.