JPH0640982Y2 - Bearing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a bearing device for supporting a rotor shaft in a small generator such as an alternator used in, for example, an automobile.

<Problems to be solved by conventional techniques and devices> Conventionally, small generators such as alternators used in automobiles and the like are directly attached to the engine block, and thus are easily affected by the vibration of the engine. However, there is a problem that the rolling bearing supporting the shaft may be seized or damaged early due to the vibration applied to the rotor in the axial direction.

Therefore, it is conceivable to hold the rolling bearing in a bearing box via a cushioning body made of an elastic material such as rubber to damp vibrations in the axial direction.

However, in that case, there is a possibility that the shaft may run out in the radial direction and the rotor or the like may be damaged.

The present invention has been made in view of the above circumstances, it is possible to reliably reduce axial vibration acting on the rolling bearing without causing core runout on the shaft, and to prevent seizure of the rolling bearing, It is an object of the present invention to provide a bearing device that can prevent damage and the like.

<Means for Solving the Problems> In order to solve the above problems, in the bearing device of the present invention, the rolling bearing has an outer peripheral surface of an outer ring of the rolling bearing, or an outer circumference of a cylindrical inner case that holds the outer ring. Is movable axially in the space between the surface and the inner peripheral surface of the bearing box,
In addition, a plurality of supports made of a rigid material, which are arranged in abutment with both the peripheral surfaces at the same time, suppress the radial displacement of the rolling bearing and allow the bearing box to move relatively in the axial direction. And a buffer body made of an elastic material that holds a plurality of supports and damps vibrations acting in the axial direction of the rolling bearing in the space between the peripheral surfaces. It is characterized by that.

<Operation> In the bearing device of the present invention having the above-described configuration, between the outer peripheral surface of the outer ring of the rolling bearing or the outer peripheral surface of the cylindrical inner case holding the outer ring and the inner peripheral surface of the bearing box. The radial displacement of the rolling bearing is suppressed by the plurality of supports made of a rigid material, which are arranged in the space so as to be movable in the axial direction and in contact with both circumferential surfaces at the same time. In addition, the buffer acting as an axial direction of the rolling bearing is damped by the cushioning body made of an elastic material, which is filled so as to hold a plurality of supports in the space between the peripheral surfaces.

<Embodiment> The bearing device of the present invention will be described below with reference to FIGS. 1 and 2 showing an embodiment.

As shown in these figures, the bearing device J of this embodiment is
It includes a bearing box 1 fixed to a rear cover A1 of an alternator A as a small generator and a rolling bearing 2 mounted on a shaft R1 of a rotor R of the alternator A.

The bearing box 1 includes a cylindrical inner case 11 into which the outer ring 21 of the rolling bearing 2 is fitted, and an outer case 12 that is attached to the rear cover A1 with the inner case 11 housed inside. A buffer body 4 made of an elastic material such as rubber and three support bodies 3 held by the buffer body 4 so as to be movable in the axial direction are interposed between 11 and 12.

The outer case 12 includes a tubular main body 12a that accommodates the inner case 11, and a flange portion 12b that extends outward from one end of the tubular main body 12a and that serves as a mounting portion to the rear cover A1. Further, the collar portion 12 is made of an annular body having a substantially L-shaped cross section.
A plurality of insertion holes 12c ... Through which mounting screws N for mounting the outer case 12 to the rear cover A1 are inserted in b.
Are formed.

The rolling bearing 2 includes the outer ring 21, an inner ring 22 fitted to the shaft R1 of the rotor R, and a rolling element 23 rotatably held between the inner and outer wheels 21, 22.

The support body 3 is formed of a ring body having a circular cross section formed of a rigid material such as steel or other metal, and is circumscribed around the outer peripheral surface 11a of the inner case 11 over the entire circumference, and the outer case 1
By inwardly contacting the inner peripheral surface 12d of the second cylindrical main body 12a over the entire circumference, the radial displacement of the bearing 2 fitted in the inner case 11 with respect to the outer case 12 is suppressed.
Further, this support body 3 ... is the outer peripheral surface 11 of the inner case 11.
Since the inner case 11 and the inner peripheral surface 12d of the body 12a of the outer case 12 are movably in contact with each other in the axial direction, the inner case 11 and the rolling bearing 2 fitted in the inner case 11 are separated from each other by the outer case. Displacement in the axial direction with respect to the case 12 is allowed within the deformable range of the buffer body 4 that holds the support bodies 3 ...

The buffer body 4 made of an elastic material such as rubber is filled in the space D between the inner case 11 and the outer case 12 so as to fill the space between the support bodies 3 ... It is welded and integrated with 11,12.
The cushioning body 4 allows the inner case 11 and the rolling bearing 2 to be displaced in the axial direction with respect to the outer case 12 within its deformable range, and at the same time, prevents the vibration acting in the axial direction of the rolling bearing 2. , Is configured to be attenuated by its own rubber elasticity.

As shown in FIG. 2, an alternator A, which is composed of the above-mentioned respective parts and is loaded with the bearing device J of this embodiment, is arranged in the front cover A2 which is paired with the rear cover A1 so as to face the rotor R. A stator S and a pulley P attached to one end of the shaft R1 for receiving rotational driving force from the engine;
A slip ring L provided on the bearing device J side of the shaft R1 and provided with a pair of annular contacts L1, L1 electrically connected to the rotor R, and the annular contact L arranged in the rear cover A1.
1, a pair of brushes b, b electrically connected to L1, and a rectifier circuit and a connector C, which are also arranged in the rear cover A1, are connected to a plurality of rectifiers r.

Then, the rotor R is excited by a current from a battery or the like through the connector C, the brushes b, b, and the annular contacts L1, L1, and at the same time, the rotor R is rotated by the pulley P.
When rotated by the rotational driving force from the engine via a belt (not shown) wound around the stator, a three-phase alternating current is generated in the stator S, and this three-phase alternating current connects the plurality of rectifiers r. After being converted into direct current by the rectifying circuit, it is supplied from the connector C to the outside.

Reference numeral B in the drawing denotes a rolling bearing mounted on the front cover A2 to support the shaft R1 of the rotor R on the pulley R side, and F and F cool the inside of the alternator A, so that the rotor R
Shows a fan installed in the.

In the bearing device J of the above embodiment, the inner case 11
The three annular support bodies 3 interposed between the outer case 12 and the outer case 12 suppress the radial displacement of the rolling bearing 2 fitted in the inner case 11, so that this rolling bearing The runout of the shaft R1 of the rotor R, which is pivotally supported by 2, is prevented. Further, since the cushioning body 4 made of an elastic material for holding the three annular support bodies 3 ... Attenuates the vibration acting in the axial direction of the rolling bearing 2, the rolling bearing 2 and the rolling bearing concerned. The seizure and damage of the rolling bearing B that supports the shaft R1 together with the shaft 2 are prevented.

The bearing device of the present invention is not limited to the above embodiment.

For example, although the ring-shaped support 3 is used in the above embodiment, a large number of spherical supports are used as the inner case.
It is also possible to fill the space D between the outer case 11 and the outer case 12, and to arrange a large number of needle-shaped supports in the space D in parallel with the axial direction of the axis R1. However, since the spherical or needle-shaped support body supports the inner case 11 from all directions, it is difficult to dispose the support body uniformly in the space D. On the other hand, the ring-shaped support 3 used in the illustrated embodiment is
If you simply cover the inner case 11,
It is most preferably used in this invention because it can support 11 evenly from all directions and can be easily incorporated into the bearing box 1.

As a method of filling the buffer body 4 between the support bodies 3, ..., A groove in the axial direction is formed on the outer peripheral surface of the inner case 11, and a rubber material or the like as a raw material of the buffer body 4 is poured from this groove to be filled. Various methods such as a method, a method of providing an injection hole penetrating from the inner peripheral surface to the outer peripheral surface of the inner case 11 and pouring and filling the rubber material or the like through the injection port can be adopted. It is also possible to adopt a spiral support as the support, and to pour and fill the spiral space formed by the spiral support with the above-mentioned rubber material or the like.

In the illustrated embodiment, the bearing box 1 is provided with the inner case 11 and the outer case 12, and the support bodies 3 and the buffer body 4 are arranged in the space D between the cases 11 and 12. However, for example, the support body and the cushioning body may be arranged between the rolling bearing and the bearing box of an integral body having no inner case.

In the illustrated embodiment, the outer case 12 of the bearing box 1 is separate from the rear cover A1, but the bearing box may be formed integrally with the rear cover.

In the embodiment shown in the drawings, the configuration of the bearing device of the present invention is applied only to the rolling bearing 2 on the rear cover A1 side of the pair of rolling bearings 2 and B that pivotally support the shaft R1 of the rotor R. The structure of the present invention may be applied to both rolling bearings, or may be applied only to the rolling bearings on the front cover side, and in any of the above cases, seizure or damage of both rolling bearings is prevented. be able to.

Although the bearing device of the embodiment shown in the drawing is used for the alternator, the configuration of the bearing device of the present invention can be applied to other types of small generators such as a DC dynamo.

In addition, various design changes can be made without changing the gist of the present invention.

<Effect of the Invention> The bearing device of the present invention is configured as described above,
In the space between the outer peripheral surface of the outer ring of the rolling bearing or the outer peripheral surface of the cylindrical inner case holding the outer ring and the inner peripheral surface of the bearing box, the inner surface of the bearing box is movable in the axial direction, and both peripheral surfaces are The radial displacement of the rolling bearing is suppressed by a plurality of supports made of a rigid material, which are arranged in contact with each other at the same time, so that the core of the rotor shaft supported by the rolling bearing is supported. Runout is prevented. Further, since the shock absorber made of an elastic material is filled in the space between the peripheral surfaces so as to hold a plurality of supports, the vibration acting in the axial direction of the rolling bearing is damped. The seizure and damage of the bearing are prevented.

Therefore, the bearing device of the present invention can surely reduce axial vibration acting on the rolling bearing without causing core runout on the shaft, and can prevent seizure and damage of the rolling bearing. It is possible to achieve various operational effects.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view showing an essential part of an embodiment of the bearing device of the present invention, and FIG. 2 is a cross-sectional view showing an example of an alternator as a small generator incorporating the above embodiment. J ... Bearing device, 1 ... Bearing box, 11 ... Inner case, 11a ... Outer surface, 12 ... Outer case, 12a ... Inner surface, 2 ... Rolling bearing, 3 ... Support, 4 ... buffer, D ... space.

Claims (1)

[Scope of utility model registration request] 1. A bearing device comprising a rolling bearing and a bearing box for supporting the rolling bearing, wherein the rolling bearing has an outer peripheral surface of an outer ring of the rolling bearing, or a cylindrical inner case for holding the outer ring. A plurality of supports made of a rigid material, which are axially movable in the space between the outer peripheral surface of the shaft and the inner peripheral surface of the bearing box, and which are arranged in contact with both peripheral surfaces at the same time. The radial movement of the rolling bearing is suppressed while being supported by the bearing box in a state of being relatively movable in the axial direction, and in the space between the two circumferential surfaces,
A bearing device, characterized in that it is filled with a cushioning body made of an elastic material that holds a plurality of supports and damps vibrations acting in the axial direction of the rolling bearing.