KR20070050745A - Dynamoelectric machine - Google Patents

Abstract

assignment

The present invention obtains a rotary electric machine that can prevent a collision between the bearing and the bearing housing, and can effectively reduce the vibration transmitted from the bearing to the bearing housing.

Resolution

The load-side bearing 7 separates the radially outermost peripheral wall surface from the radially inner peripheral wall surface of the load-side bearing housing 6 facing each other, and the axial end face of the load-side bearing housing 6 faces the shaft. It is accommodated in the load side bearing accommodating part 6 spaced apart from the direction inner wall surface. And the 1st damping member 30 is extended between both wall surfaces in close contact with the radially outermost peripheral wall surface of the load side bearing 7, and the radially inner peripheral wall surface of the load side bearing accommodation part 6, and load-side bearing 7 This load side bearing accommodation part 6 is supported.

Rotary electric machinery, bearings

Description

Rotary Electric Machines {DYNAMOELECTRIC MACHINE}

BRIEF DESCRIPTION OF THE DRAWINGS The longitudinal cross-sectional view which shows the motor for electric power steering apparatus concerning Embodiment 1 of this invention.

2 is an essential part cross sectional view showing a circumference of a bearing in the motor for an electric power steering apparatus according to Embodiment 1 of the present invention.

3 is a view for explaining the structure of a member in the motor for an electric power steering apparatus according to Embodiment 1 of the present invention.

4 is an essential part cross sectional view showing a circumference of a bearing in the motor for an electric power steering apparatus according to Embodiment 2 of the present invention.

5 is an essential part cross sectional view showing a bearing circumference of the motor for an electric power steering apparatus according to Embodiment 3 of the present invention.

6 is an essential part cross sectional view showing a bearing circumference of the motor for an electric power steering apparatus according to Embodiment 4 of the present invention.

FIG. 7 is an essential part cross sectional view showing a bearing circumference of the motor for an electric power steering apparatus according to Embodiment 5 of the present invention; FIG.

8 is an essential part cross sectional view showing a bearing circumference of the motor for an electric power steering apparatus according to Embodiment 6 of the present invention.

<Description of the code>

6: load side bearing compartment

7, 7A: Load Side Bearing

8: half load side bearing housing

9: half load side bearing

10: shaft

11: amateur

30, 30A: 1st damping member

35: second vibration damping member

36: caulking part

7: engagement convexity

8: engagement recess

39: E ring

Field of technology

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to rotary electric machines, such as automotive alternators, automotive alternators, and automotive alternators, and more particularly, to a sound and vibration reduction structure in a bearing portion supporting an axis of an armature shaft.

Conventional technology

In the conventional first rotating electric machine, a viscous damping force is generated by relative sliding between at least one of the surfaces where the ball bearing and the rotor shaft contact and the surfaces where the ball bearing and the bearing housing contact. The vibration damping material to be made is disposed at a predetermined interval in the axial direction. This generates a viscous damping force due to relative sliding between the outer circumferential surface of the outer ring of the ball bearing and the inner circumferential surface of the bearing housing, thereby suppressing the vibration and noise caused by the passage of the ball and the bending of the inner ring and the outer ring (for example, , Patent Document 1).

Further, in the conventional second rotary electric machine, an anti-collision member which secures a gap between the outer ring and the half-load side accommodating portion of the anti-load side bearing and the half-load side accommodating portion to prevent a collision. Is generated to reduce the occurrence of a collision sound caused by the vibration in the radial direction of the shaft (see Patent Document 2, for example).

[Patent Document 1]

Japanese Patent Application Laid-Open No. 10-66300

[Patent Document 2]

Japanese Patent Application Laid-Open No. 2000-166169

In the conventional first rotating electric machine, since the outer circumferential surface of the outer ring of the ball bearing and the inner circumferential surface of the bearing housing come into contact with each other, a collision sound caused by the metal collision between the vibrating ball bearing and the bearing housing is generated, and the vibration is caused by the vibration damper. Absorption of vibration energy becomes insufficient, and there exists a problem that the vibration transmitted from a bearing to a bearing housing cannot fully be reduced.

In the conventional second rotary electric machine, the boss is subjected to an eccentric load from the external device unless the axis of the external device coincides with the boss line. As a result, since the shaft receives the swinging force with the load side bearing as a point, it is necessary to firmly fix the load side bearing, and does not provide an anti-collision member between the outer ring of the load-side bearing and the load-side bearing accommodation portion. Is disposed only between the outer ring of the half-load side bearing and the half-load side bearing housing. Therefore, the outer circumferential surface of the outer ring of the load-side bearing is in contact with the inner circumferential surface of the load-side bearing accommodation portion, and on the load side, collision sound and vibration transmission due to the radial vibration of the shaft have occurred.

This invention is made | formed in order to solve the said subject, The 1st damping member between the radial outermost peripheral wall surface of a bearing and the radially inner peripheral wall surface facing a bearing accommodating part in a load side and a half load side. Interposed between the bearing housing and the bearing housing to prevent direct contact between the bearing and the bearing housing and effectively reduce vibrations transmitted from the bearing to the bearing housing. An object of the present invention is to obtain a rotating electric machine.

Means to solve the problem

The present invention is a rotary electric machine in which a shaft is supported by a pair of bearings in which an armature shaft is accommodated in and supported by a pair of bearing accommodation portions, wherein each of the pair of bearings has a diameter thereof. The radially outermost circumferential surface is spaced apart from the radially inner circumferential wall surface between the direction outermost circumferential wall surface and the radially inner circumferential wall surface facing the bearing accommodation portion to separate the radially outermost circumferential surface from the radially inner circumferential wall surface. It is housed and supported by the bearing accommodating part by spaced apart from the axial inner wall surface facing the bearing accommodating part.

According to the present invention, since the bearing and the bearing housing portion are separated from each other, even if vibration is transmitted to the bearing, metal collision between the bearing and the bearing housing portion is avoided, and the occurrence of a collision sound is prevented. In addition, when the vibration is transmitted to the bearing, the first vibration damping member absorbs the vibration energy, and the vibration transmitted from the bearing to the bearing accommodation portion is effectively reduced.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described about drawing.

Embodiment 1

BRIEF DESCRIPTION OF THE DRAWINGS The longitudinal cross-sectional view which shows the motor for electric power steering apparatus (henceforth electric motor) which concerns on Embodiment 1 of this invention. FIG. 2: shows the bearing periphery in the electric motor which concerns on Embodiment 1 of this invention. One main part sectional drawing, FIG. 3 is a figure explaining the structure of the member in the electric motor which concerns on Embodiment 1 of this invention, FIG. 3 (a) shows sectional drawing, FIG. 3 (b) shows a front view. It is shown.

In Fig. 1, the electric motor 1 includes a cylindrical yoke 2 having a bottom and a four-pole field permanent magnet 3 arranged and fixed at predetermined intervals in a circumferential direction on an inner circumferential wall surface of the yoke 2. ), A load side bearing 7 housed and supported in a housing 5 fastened and fixed to the opening of the yoke 2 by a screw 4, and in a load side bearing accommodation portion 6 formed at the center of the housing 5; And a shaft 10 which is rotatably supported at both ends by a half-load bearing 9 housed and supported in the half-load bearing housing 8 formed at the bottom center of the yoke 2 and disposed in the yoke 2; The armature 11 fixed to the shaft 10 and disposed on the inner circumferential side of the field permanent magnet 3, the commutator 12 fixed to the load side bearing 7 side of the shaft 10, and the commutator 12 Brush 14 which abuts on the surface of the paddle by the elastic force of the spring 13, the brush holder 15 which supports this brush 14, and the load side bear And has a Gras mid (18) and a boss (16) fixed to the end (端 部), the lead wire 17 passes through the shaft 10 coming out by extending from (7). Moreover, the armature 11 is provided with the core 19 which has the slot extended in the axial direction of the shaft 10, and the coil 20 comprised by winding the conducting wire in the slot.

The load side bearing 7 is a rolling bearing configured by arranging a plurality of balls 23 which are rolling elements between the outer ring 21 and the inner ring 22. And the load side bearing 7 is accommodated and supported by the load side bearing accommodation part 6 via the 1st damping member 30. As shown in FIG.

As shown in FIG. 3, the first vibration damping member 30 includes an annular portion 31 and an annular portion 31 mounted on an outer ring 21 of the load-side bearing 7 in an externally fitted state. ) Extends from one end face to the inner circumferential side, and extends from the other end face of the ring-shaped flange portion 32 and the annular portion 31 to the inner circumferential side and abuts the one end face of the outer ring 21, and the other end face of the outer ring 21. The hook portion 33 which is elastically retained is provided. In addition, a plurality of slits 34 are formed at equal pitches in the circumferential direction so as to extend from the other end of the annular portion 31 to one end side. Thereby, the other end side of the torus part 31 is divided into several in the circumferential direction, and the division part comprises the hook part 33, respectively. Thus, the elastic force of the hook portion 33 is secured.

This 1st damping member 30 is press-fitted into the load side bearing 7 from the one end side in the axial direction. At this time, the first vibration damping member 30 first deforms the hook portion 33 in a state where the mouth is opened by its elastic force, and ascends the outer ring 21 to the other end in the axial direction on the outer circumferential wall surface of the outer ring 21. To the side. When the hook portion 33 reaches the other end in the axial direction of the outer ring 21, the hook portion 33 is restored to the cylindrical shape by the restoring force, and the first vibration damping member 30 is fitted to the load side bearing 7. do. At this time, the flange portion 32 abuts on one end surface of the outer ring 21, the annular portion 31 abuts on the outer circumferential wall surface of the outer ring 21, and the hook portion 33 is the other end surface of the outer ring 21. In contact with, the first vibration damping member 30 is prevented from coming off. And the load side bearing 7 to which the 1st damping member 30 was attached is press-fitted into the load side bearing accommodation part 6 of the housing | casing 5, as shown in FIG. In addition, one end of the shaft 10 is pressed into the inner ring 22 of the load-side bearing 7.

Moreover, the half load side bearing 9 is also a rolling bearing comprised similarly, and is accommodated and supported by the half load side bearing accommodation part 8 via the 1st damping member 30. As shown in FIG. Then, the other end of the shaft 10 is pressed into the inner ring of the half load side bearing 9.

Here, the first damping member 30 is made of a material having elasticity, and has a function of damping vibration, and the outer ring 21 and the load side bearing accommodating portion 6 (half load side bearing accommodating portion 8). It has a function of reducing collision sounds caused by vibration. As the material having elasticity, for example, rubbers such as CR (chloroprene rubber), EPDM (ethylene-propylene-diene methylene linkage), resins such as PA (polyamide) and PBT (polybutylene terephthalate) can be used.

In addition, since the first damping member 30 covers the outer peripheral surface of the load side (half load side) bearing to absorb the swing force, the first vibration damping member 30 is disposed between the half load side bearing 9 and the half load side bearing housing 8. In addition, it can also be retrofitted between the load side bearing 7 and the load side bearing accommodation part 6.

In the electric motor 1 comprised in this way, in the load side bearing 7, the outer peripheral wall surface of the outer ring 21 which is the said outermost outer peripheral wall surface is spaced apart from the radial inner peripheral wall surface of the load side bearing accommodating part 6, Moreover, the end surface of the outer ring 21 which is an axial end surface is accommodated in the load side bearing accommodation part 6 spaced apart from the opposing axial inner wall surface of the load side bearing accommodation part 6. Then, the annular portion 31 of the first vibration damping member 30 is pressed against both wall surfaces in close contact with the outer circumferential wall surface of the outer ring 21 and the inner circumferential wall surface of the load bearing bearing portion, and the load side bearing 7 This load side bearing accommodation part 6 is supported. In addition, the half load side bearing 9 is also supported by the half load side bearing accommodation part 8 via the 1st damping member 30 similarly.

Then, a current is supplied from the lead wire 17 to the coil 20 through the brush 14 and the commutator 12. And the armature 11 rotates with the shaft 10 by an electronic action. The rotational force of this shaft 10 is transmitted to the external device (not shown) via the boss 16.

Here, if the axis of the external device and the axis of the boss 16 do not coincide, the boss 16 receives an eccentric load from the external device. For this reason, the shaft 10 receives the oscillation force which made the load side bearing 7 the point. At this time, the first vibration damping member 30, which is opened between the load side bearing 7 and the load side bearing accommodation portion 6, elastically deforms due to the oscillating force acting on the load side bearing 7, and the load side bearing 7. Oscillation force, i.e., vibration energy, acted on In this way, transmission of the swinging force acting on the load side bearing 7 to the housing 5 via the load side bearing accommodation 6 is suppressed. In addition, a radial clearance gap is secured between the load side bearing 7 and the load side bearing accommodation portion 6 by the first damping member 30 so that the load side bearing 7 collides with the load side bearing accommodation portion 6. The occurrence of metal collision sounds is prevented.

Moreover, the radial magnetic attraction force acting on the armature 11 fluctuates in the circumferential direction, and vibrations occur in the armature 11. This vibration is transmitted from the armature 11 to the load side bearing 7 via the shaft 10. At this time, the first vibration damping member 30 elastically deforms and vibration energy is absorbed. Thereby, the vibration which acts on the load side bearing 7 is suppressed from being transmitted to the housing 5 via the load side bearing accommodation part 6. Moreover, the radial clearance gap is secured between the load side bearing 7 and the load side bearing accommodation part 6 by the 1st damping member 30, and the load side bearing 7 and the load side bearing accommodation part 6 resulting from this vibration are caused. The occurrence of metal collision sound with) is prevented.

Moreover, when the brush 14 slide-contacts the commutator 12 which rotated, the brush sliding contact sound generate | occur | produces. And this brush sliding contact sound is transmitted to the load side bearing 7 via the shaft 10, and is absorbed by the 1st damping member 30. As shown in FIG.

In addition, also at the half load side, it is suppressed that the vibration transmitted to the half load side bearing 9 is transmitted to the half load side bearing accommodation part 8 similarly. The occurrence of metal collision noise between the half load side bearing 9 and the half load side bearing housing 8 is also prevented.

Thus, according to this Embodiment 1, the 1st damping member 30 is retrofitted between the load side bearing 7 and the load side bearing accommodation part 6, and the load side bearing 7 is equipped with the load side bearing accommodation part 6. The first vibration damping member 30 is installed between the half load side bearing 9 and the half load side bearing accommodation portion 8 so that the half load side bearing 9 has the number of the half load side bearings. The clearance is secured and stored in the payment part 8. Therefore, the vibration and sound transmitted to the load side bearing 7 and the half load side bearing 9 are absorbed by the first damping member 30 having elasticity, and the transmission to the housing 5 and the yoke 2 is suppressed. do. Further, metal collision between the outer ring 21 of the load side bearing 7 and the half load side bearing 9 and the load side bearing housing 6 and the half load side bearing housing 8 vibrates to the first vibration damping member 30. This avoids the occurrence of collision sounds due to metal collision.

Moreover, the 1st damping member 30 has the annular part 31 formed in the inner diameter shape which adjoins the outer peripheral wall surface of the outer ring 21 of the load side bearing 7 and the half-load side bearing 9, and the outer ring 21 of the outer ring 21. As shown in FIG. Since it is provided with the flange part 32 formed in the one end of the torus part 31 so that it may be in close contact with the one end surface, and the hook part 33 formed in the other end of the torus part 31 so that it may engage with the other end surface of the outer ring 21, When the first damping member 30 is attached to the load side bearing 7 and the half load side bearing 9, the first damping member 30 is prevented from being pulled out.

In addition, since the slit 34 is formed so that the other end side of the annular part 31 may be separated in multiple numbers in the circumferential direction, the 1st damping member 30 load-side bearing 7 of the 1st damping member 30 And the mountability to the half load side bearing 9 is improved.

In the first embodiment, the load side bearing and the half load side bearing are described as using the ball as the rolling element, but a roller may be used instead of the ball as the rolling element.

In addition, although the said Embodiment 1 demonstrated as producing a load side bearing, a half load side bearing, and a 1st damping member as a separate component, when manufacturing a 1st damping member, it modularizes integrally with a load side bearing and a half load side bearing. You may also do so. In this case, the number of parts is reduced and the assemblability is improved.

Embodiment 2

4 is a sectional view of principal parts showing a circumference of a bearing in the electric motor according to the second embodiment of the present invention.

In FIG. 4, 30 A of 1st damping members are manufactured similarly to the 1st damping member 30 except that every other hook part 33 is notched. And the 2nd damping member 35 is connected to the other end surface of the outer ring 21 of the load side bearing 7, and the outer ring 21 of the load side bearing accommodation part 6 in the area | region of each notch part of the hook part 33. As shown in FIG. It is closely connected to both wall surfaces between opposing axial inner wall surfaces. In addition, the other structure is comprised similarly to the said 1st Embodiment.

In the second embodiment, similarly to the first embodiment, the annular portion 31 of the first vibration damping member 30A is retrofitted between the outer circumferential wall surface of the outer ring 21 and the inner circumferential wall surface of the load side bearing accommodation portion 6. As a result, vibration energy in the radial direction transmitted to the load-side bearing 7 through the shaft 10 is absorbed by the elastic deformation of the annular portion 31 of the first vibration damping member 30. In addition, since the second vibration damping member 35 is installed between the other end surface of the outer ring 21 and the axial inner wall surface of the load side bearing accommodation portion 6, the load side bearing 7 via the shaft 10. Vibration energy in the thrust direction transmitted to is absorbed by the elastic deformation of the second vibration damping member 35.

Further, a radial gap between the load side bearing 7 and the load side bearing accommodation portion 6 is secured by the annular portion 31, and the load side bearing 7 and the load side bearing accommodation portion 6 and the axial clearance are second to each other. Since it is ensured by the vibration damping member 35, the collision between the load side bearing 7 and the load side bearing accommodation part 6 is prevented. Therefore, the sound and vibration of the electric motor are further reduced.

In addition, in the said Embodiment 2, although the 2nd damping member is arrange | positioned between the wall surface facing in the axial direction of a load side bearing and a load side bearing accommodating part, the 2nd damping member is also installed in the half load side bearing and the half load side bearing. You may arrange | position between the wall surface facing in the axial direction with a storage part.

Embodiment 3

In this Embodiment 3, as shown in FIG. 5, after press-fitting the load side bearing 7 to which the 1st damping member 30 was attached to the load side bearing accommodation part 6, the load side bearing accommodation part 6 was carried out. Caulking processing (caulking) is performed to fix the first vibration damping member 30 to the load side bearing accommodation part 6. In FIG. 5, 36 is a caulking part. In addition, although not shown in figure, the half load side also caulking (coking) is performed to the half load side bearing accommodation part 8, and the 1st damping member 30 is being fixed to the half load side bearing accommodation part 8.

In addition, the other structure is comprised similarly to the said 1st Embodiment.

According to this Embodiment 3, since the 1st damping member 30 is being fixed to the load side bearing accommodation part 6 and the half load side bearing accommodation part 8 by the caulking part 36, in operation of an electric motor, The removal of the first vibration damping member 30 is surely prevented.

Embodiment 4

In this Embodiment 4, as shown in FIG. 6, the engagement convex part 37 protrudes in the one end side outer peripheral part of the torus part 31 of the 1st damping member 30, and the engagement recessed part 38 is provided. Is recessed in the inner circumferential wall surface of the load-side bearing 7. And when the load side bearing 7 to which the 1st damping member 30 was fitted was press-fitted into the load side bearing accommodation part 6, the engagement convex part 37 was inserted into the engagement recessed part 38, 1 The vibration damping member 30 is fixed to the load bearing portion 6. In addition, although not shown, the engagement convex part 37 protrudes to the annular part 31 of the 1st damping member 30 also in the half load side, The engagement recessed part 38 is provided in the half load side bearing 9, and is not shown. It is provided concave, and the engagement convex part 37 is inserted in the engagement recessed part 38, and the 1st damping member 30 is being fixed to the half load side bearing accommodation part 8. As shown in FIG.

In addition, the other structure is comprised similarly to the said 1st Embodiment.

According to this Embodiment 4, the engagement convex part 37 of the 1st damping member 30 is inserted in the engagement recessed part 38 of the load side bearing accommodation part 6 and the half load side bearing accommodation part 8, Since the first damping member 30 is snap-fitted to the load side bearing housing 6 and the half load side bearing housing 8, the first vibration damping member 30 during the operation of the electric motor is surely removed. In addition, the rotation of the first vibration damping member 30 around the shaft 10 is reliably prevented.

In addition, although the engagement convex part is provided in the load side bearing accommodating part and the half load side bearing accommodating part in the said 4th damping member in the said Embodiment 4, the engagement convex part is provided in the load side bearing accommodating part and the half load side bearing number. It may be provided in a payment part, and an engagement recess may be provided in a 1st damping member.

Embodiment 5

In this Embodiment 5, as shown in FIG. 7, E-ring after the load side bearing 7 to which the 1st damping member 30 was fitted was press-fitted in the load side bearing accommodation part 6 of the housing | casing 5, (39) is attached. In addition, although not shown in figure, the E-ring 39 is attached after the half-load bearing 9 in which the 1st damping member 30 was fitted is press-fitted in the half-load bearing accommodation part 8 also in the half load side. .

In addition, the other structure is comprised similarly to the said 1st Embodiment.

According to the fifth embodiment, since the first vibration damping member 30 is fixed to the load side bearing accommodation portion 6 and the half load side bearing accommodation portion 8 by the E ring 39, during operation of the electric motor. The removal of the first vibration damping member 30 is surely prevented.

Here, although the fixing method of the 1st damping member to the load side bearing accommodation part is demonstrated as the same as the fixing method of the 1st damping member to the half load side bearing accommodation part of the said 1st damping member, The fixing method to the bearing housing portion may be different from the load side and the half load side. In other words, the fixing method described in the above Embodiments 3 to 5 may be appropriately selected, and the first vibration damping member may be fixed by the load side bearing accommodation portion and the half load side bearing accommodation portion by another method.

Embodiment 6

In the sixth embodiment, as shown in Fig. 8, a load side bearing 7A composed of sliding bearings is used in place of the load side bearing 7 composed of rolling bearings. In addition, although not shown in figure, in the half load side, the bearing comprised by the sliding bearing is used instead of the bearing which the half load side bearing consists of rolling bearing. Here, the sliding bearing is a cylindrical body (sleeve) made of a material containing lubricating oil in a porous material called a sintered metal.

In addition, the other structure is comprised similarly to the said 1st Embodiment.

Also in the sixth embodiment, similarly to the first embodiment, a collision between the load side bearing, the half load side bearing, the load side bearing accommodation portion, and the half load side bearing accommodation portion is prevented, and the load side bearing accommodation portion and the half load side from the load side bearing and the half load side bearing are prevented. The vibration transmitted to the bearing housing is reduced.

Moreover, although each said embodiment demonstrates the motor for an electric power steering apparatus, this invention produces the same effect also when applied to rotating electric machines, such as a vehicle starting motor, a vehicle AC generator, and a vehicle AC motor generator.

According to the present invention, since the bearing and the bearing housing portion are separated from each other, even if vibration is transmitted to the bearing, metal collision between the bearing and the bearing housing portion is avoided, and the occurrence of a collision sound is prevented. In addition, when the vibration is transmitted to the bearing, the first vibration damping member absorbs the vibration energy, and the vibration transmitted from the bearing to the bearing accommodation portion is effectively reduced.

Claims (6)

In a rotary electric machine in which a shaft is supported by a pair of bearings in which an armature shaft is accommodated in and supported by a pair of bearing accommodation portions, Each of the pair of bearings interposes the radially outermost circumferential surface of the radially outermost circumferential wall with the first vibration damping member between the radially outermost circumferential wall surface and the radially inner circumferential wall facing the bearing housing portion. And spaced apart from the axial end face of the bearing housing portion so as to be spaced apart from and facing the inner wall surface of the bearing housing portion. The method of claim 1, And a second vibration damping member is interposed between the axial end surface of the bearing and the axial inner wall surface of the bearing accommodation portion. The method according to claim 1 or 2, And the first vibration damping member is fixed to the bearing accommodation portion by caulking. The method according to claim 1 or 2, Engagement recesses or engagement convex portions are provided in the bearing accommodation portion, engagement convex portions or engagement recesses are provided in the first damping member, and the first vibration damping member is formed by fitting the engagement recesses and the engagement convex portions. A rotating electric machine, which is fixed to a bearing housing. The method according to claim 1 or 2, And the first vibration damping member is fixed to the bearing accommodation portion by an E-ring mounted to the bearing accommodation portion. The method according to claim 1 or 2, And said first damping member is integrally molded with said bearing.

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