JP2005086910A - Bearing pre-load device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing pre-load device by which a pre-load of a bearing can be grasped quantitatively, changed, and adjusted, and the pre-load can be changed without disassembling a rotary electric machine, even if troubles such as bearing sound occur. <P>SOLUTION: The bearing pre-load device is constituted of a bearing supported by fitting it to the load side and the anti-load side of a rotating shaft of the rotary electric machine; and inner/outer rings of one bearing are fixed. A pre-load spring for axially applying the pre-load is arranged on the outer ring of the other bearing; the pre-load spring is arranged on the outside of a bearing housing engaged with an external end face of the outer ring of the other bearing; the spring force of the pre-load spring is received with a thrust bearing presser foot fixed to the rotating shaft via the thrust bearing; and the pre-load is applied to the other bearing. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a bearing preloading device that applies a preloading load so as to prevent bearing noise and outer ring creep of a rolling bearing that is fitted to the inner surface of a bearing housing.

In the conventional bearing preloading device, a metal countersunk preloading spring having an annular corrugated cross section that presses in the axial direction is inserted into the rotating electrical machine by being appropriately compressed in the axial direction. This preload spring applies axial preload to the bearing outer ring, thereby reducing noise generated by rotation from the bearing and preventing damage to the bearing due to vibration. (For example, refer to Patent Document 1).
The conventional bearing preload device is configured as shown in FIG.
In FIG. 3, a load side bracket 2 and an anti-load side bracket 3 are attached to both ends of the frame 1. Bearings 6 and 7 such as bearings are supported. A metal disc spring preload spring 17 having an annular corrugated cross section that presses in the axial direction is inserted into the bearing on one side while being compressed in the axial direction. In the figure, 4 is a bearing cover.
Thus, the conventional bearing preload device applies a preload to the rolling bearing using the metal disc spring preload spring 17 having an annular corrugated cross section.
JP-A-5-64390

However, such conventional techniques have the following problems.
A conventional bearing preload device is disposed inside a rotating electrical machine, and a metal countersunk spring preload spring having an annular corrugated cross section that presses in the axial direction is appropriately compressed and inserted in the axial direction. Therefore, the normal preload load amount cannot be quantitatively grasped. For this reason, when a problem such as bearing noise occurs due to variations in assembly errors and the like, it is necessary to disassemble the rotating electric machine and change the number of preload springs, which is very troublesome.
・ There was a risk that creep would occur on the outer ring of the bearing due to variations in the bearing preload.
The present invention has been made to solve such a problem. The preload load of the bearing is quantitatively grasped and can be changed and adjusted, and the rotating electrical machine can be used even when a problem such as bearing noise occurs. It is an object of the present invention to provide a bearing preload device capable of changing a preload load without disassembling.

In order to solve the above problems, the present invention is configured as follows.
According to the first aspect of the present invention, the bearings are fitted and supported on the load side and the non-load side of the rotating shaft of the rotating electrical machine, the inner and outer rings of one bearing are fixed, and the outer ring of the other bearing is preloaded in the axial direction. In the bearing preloading device in which the preload spring to be added is arranged, the preload spring is arranged by a thrust bearing press fixed to the rotating shaft, the preload spring being arranged outside the bearing housing engaged with the outer end surface of the outer ring of the other bearing. The force is received through a thrust bearing, and a preload is applied to the other bearing.
The invention according to claim 2 is characterized in that the thrust bearing retainer is fixed to the rotary shaft by a bearing nut provided on an inner peripheral portion of the thrust bearing retainer.
The invention according to claim 3 is characterized in that the thrust bearing retainer is fixed to the rotating shaft by friction fastening means provided on the inner peripheral portion of the thrust bearing retainer.

  According to the bearing preload device of the present invention, since the preload can be changed and managed according to the size and number of springs, it is possible to prevent bearing noise, outer ring creep and vibration, and problems such as bearing noise. Even when it occurs, the number and length of the springs can be changed without disassembling the rotating electric machine.

  Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a side sectional view of a bearing preloading device showing a first embodiment of the present invention.
The bearing preload device is configured as follows. That is, for example, a bearing 7 such as an inner ring rolling roller bearing inserted into the rotary shaft 5 is disposed at the end of the rotating machine on the side opposite to the load side, and the load-side bearing 6 (not shown) includes the bracket 2 and the bearing cover. 4 and fixed.
The outer ring of the bearing 7 on the anti-load side is fixed only on one end face by the bearing cover 10, and a plurality of spring insertion holes 16 are formed in the bearing housing 12 in a circular shape, and a preload spring 18 is provided in the spring insertion hole 16. The preload spring 18 is pressed by a spring press 8 which is inserted and has the same diameter and the same number of holes as the bearing housing 12. The spring retainer 8 is opposed to the disk-shaped thrust bearing retainer 11 in the axial direction via a thrust bearing 9. The thrust bearing 9 is provided so that the thrust bearing retainer 11 rotating together with the rotary shaft 5 can receive the spring force of the preload spring 18 on the fixed side. The thrust bearing retainer 11 is provided with a bearing nut 13 having an inner peripheral portion subjected to female threading. In accordance with this, external threading is performed on the outer peripheral surface of the rotating shaft 5. The thrust bearing retainer 11 presses the preload spring 18 through the thrust bearing 9 and the spring retainer 8 by tightening the bearing nut 13 and applies a preload to the bearing 7 through the bearing housing 12 and the bearing cover 10.
Since it is such a structure, it is possible to grasp | ascertain a preload load quantitatively by managing the dimension of the preload spring 18, and preload is changed by changing the number of the preload springs 18 or the length of the preload spring 18. It is possible to change the load. Even when bearing noise or creep occurs, the preload can be changed without disassembling the rotating electrical machine to prevent bearing noise and creep.

FIG. 2 is a side sectional view of a bearing preload device showing a second embodiment of the present invention.
Instead of the bearing nut 13, a friction fastening structure is used in which the wedge-type presser part 14 is fastened by the fastening seat 15, and the thrust bearing presser 11 and the rotating shaft 5 are not required to be threaded. This makes it possible to perform proper tightening more easily.

It is a sectional side view of the bearing preload apparatus which shows the 1st Example of this invention. It is a sectional side view of the bearing preload apparatus which shows the 2nd Example of this invention. It is a sectional side view which shows the bearing preload apparatus in a prior art.

Explanation of symbols

1 Frame 2, 3 Bracket 4 Bearing cover 5 Rotating shaft 6, 7 Bearing 8 Spring retainer 9 Thrust bearing 10 Bearing cover 11 Thrust bearing retainer 12 Bearing housing 13 Bearing nut 14 Wedge-type retainer part 15 Tightening seat 16 Spring insertion hole 17 , 18 Preload spring

Claims (3)

A bearing preload in which a bearing is fitted and supported on the load side and the non-load side of the rotating shaft of a rotating electrical machine, the inner and outer rings of one bearing are fixed, and a preload spring is arranged to add preload to the outer ring of the other bearing in the axial direction. In the device
The preload spring is disposed outside the bearing housing that engages with the outer end face of the outer ring of the other bearing, and the spring force of the preload spring is received via the thrust bearing by a thrust bearing retainer fixed to the rotating shaft, A bearing preload device characterized by adding preload to the bearing. The bearing preloading device according to claim 1, wherein the thrust bearing retainer is fixed to the rotating shaft by a bearing nut provided on an inner peripheral portion of the thrust bearing retainer. The bearing preloading device according to claim 1, wherein the thrust bearing retainer is fixed to the rotary shaft by friction fastening means provided on an inner peripheral portion of the thrust bearing retainer.

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