JP2000283170A - Fixing method for inner ring in rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely fix a bearing to a shaft of a driving force input/output sides without imparting an influence to a final clearances by heating a push- press ring of an inner surface taper, inserting it into a shaft, pushing an inner ring, heating a fixing ring of an outer surface taper, and inserting it between a shaft and the push-press ring. SOLUTION: With interference of a such degree that inner rings 2a of a shaft 1 and a bearing 2 do not generate fretting, the bearing 2 is heated and expanded, and is inserted into the shaft 1. A push-press ring 3 having a taper on an inner diameter side and a fixing ring 4 having a taper on an outer diameter side are heated and expanded at the same temperature, and are inserted into the shaft 1. In the taper, a bearing side is formed in a small diameter shape, the ring 3 is brought into contact with the inner rings 2a, and the rings 3, 4 are brought into contact with each other at a taper surface. When they are cooled, the ring 4 is shrinkage-fitted with the shaft 1 on the inner diameter side, and the inner rings 2 are fixed to an optimal position of the shaft 1. External force P is directionally converted by the taper, and the almost thereof are acted as fixing force F2. It is thus possible to surely fix the bearing without an influence to rotating property of the bearing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a method for fixing an inner race in a rolling bearing.

[0002]

2. Description of the Related Art Conventional bearing fixing methods include a shrink fit in which the outer diameter of a mounting shaft is larger than the inner ring diameter of the bearing, and a shrink fit is taken, and the bearing is fixed using a lock nut. There is an end plate method in which the shaft end is pressed by a plate after insertion.

[0003]

However, the fixing method by shrink fitting has a feature that the final clearance of the bearing is reduced because the inner ring of the bearing is expanded by the stiffener of the bearing for obtaining the fixing force. For this reason, when trying to further increase the fixing force, there is a problem that the final clearance of the bearing is excessively reduced, which affects the rotational property of the bearing. In addition, the fixing method using the lock nut has a problem in that the lock nut is loosened due to disturbances such as expansion and contraction of the shaft due to load, vibration, and heat, and the bearing cannot be fixed. It leads to up.
Further, the fixing method using the end plate does not cause the bearing to escape if the plate is securely fixed, but cannot be used structurally for the shaft on the driving force input / output side.

An object of the present invention is to solve the above-mentioned problems and to provide a method of fixing an inner ring in a rolling bearing which can be securely fixed to a shaft on a driving force input / output side without affecting a final clearance of the bearing. And

[0005]

Means for Solving the Problems To solve the above problems, the configuration of the present invention is as follows. That is, the first configuration is such that a rolling bearing is inserted into a shaft, the bearing side is inserted into the shaft by heating and expanding a pressing ring having a taper having a small diameter on the inner surface, the pressing ring presses the inner ring of the bearing, and the bearing side has a small diameter. Heat expansion of a fixing ring having a tapered outer surface is inserted between the shaft and the pressing ring until they come into contact with their tapered surfaces, pressed against the bearing side, and after cooling, the fixed ring is And shrink fit.

In a second configuration, a rolling bearing is inserted into a shaft,
The bearing side inserts a pressing ring having a taper with a small diameter on the inner surface into the shaft, presses the inner ring of the bearing, and the bearing side has a fixing ring with a taper with a small diameter on the outer surface, between the shaft and the pressing ring. The fixing ring is press-fitted to the bearing side until it comes into contact with the tapered surface, and the fixing ring is tightly fixed to the shaft on the inner diameter side.

A third configuration is to arbitrarily change the taper inclination by arbitrarily changing the inclination of the taper in addition to the first or second configuration.

[0008]

Embodiments of the present invention will be described below based on one embodiment shown in the drawings. In FIG. 1, first, a shim shiro is set such that the inner ring 2 a of the shaft 1 and the bearing 2 does not cause fretting, and the bearing 2 is heated and expanded and inserted into the shaft 1. At this time, there is no squeezing enough to completely fix the bearing 2.

Next, the pressing ring 3 having a taper on the inner diameter side and the fixing ring 4 having a taper on the outer diameter side are both heated and expanded at the same temperature and inserted into the shaft 1. The taper of these two rings is such that the diameter on the bearing side is small. At this time, the pressing ring 3 is inserted until it comes into contact with the inner ring 2a, and the pressing ring 3 and the fixed ring 4 come into contact with each other at their tapered surfaces. When these are cooled, the fixing ring 4 is shrink-fitted and fixed to the shaft 1 on the inner diameter side, whereby the inner ring 2a of the bearing 2 is fixed to an arbitrary position on the shaft 1.

Next, these are set in the bearing case 5, and the end faces are covered with the bearing cover 6. In addition,
7 is an oil seal.

Now, the relationship of the forces when the external force P acts on the bearing 2 will be described with reference to FIG. The direction of the external force P is converted into the external force Pa by the action of the taper. As a result, many of the external force P will act as a fixed force F ₂ is a component force, bearing relief force F ₁ is merely acting as a slightly component of the external force P, the fixed bearing 2 is securely Done.

The fixing force F _{2 of the} bearing can be set to an arbitrary value by arbitrarily changing the inclination of the tapered portions of the pressing ring 3 and the fixing ring 4.

The above-mentioned method is a method of fixing the rings 3 and 4 by shrink fitting. However, the rings 3 and 4 may be tightly fixed at room temperature without heating. That is, the inner diameter of the fixing ring 4 is set slightly smaller than the diameter of the shaft 1. Then, the pressing ring 3 is inserted into the shaft 1, the inner ring 2a of the bearing is pressed, and the fixed ring 4 is hit and pressed with a hammer or the like until the fixing ring 4 comes into contact with the tapered surface between the shaft 1 and the pressing ring 3. Then press down on the bearing side. As a result, the fixing ring is tightly fixed to the shaft on the inner diameter side.

The present invention is not limited to the examples and embodiments described above, but includes various modifications without departing from the spirit and scope of the claims.

[0015]

According to the configuration of the present invention, since the bearing is fixed by the pressing ring and the fixing ring, the bearing can be securely fixed without affecting the rotation of the bearing.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a force acting on a bearing fixing portion.

[Explanation of symbols]

1 Shaft 2 Bearing 2a Inner ring 2b Outer ring 2c Ball 3 Press ring 4 Fixing ring 5 Bearing case 6 Bearing cover 7 Oil seal F ₁ Bearing escape force F ₂ Fixing force P External force Pa External force

Claims (3)

[Claims] 1. A rolling bearing is inserted into a shaft, and a pressure ring having a taper having a small diameter on an inner surface thereof is heated and expanded on the bearing side and inserted into the shaft to press the inner ring of the bearing, so that the bearing side has a small diameter. The fixing ring having a taper on the outer surface is heated and expanded, inserted between the shaft and the pressing ring until they come into contact with their tapered surfaces, pressed down on the bearing side, and after cooling, the fixing ring is sintered with the shaft on its inner surface. A method of fixing an inner ring in a rolling bearing that is fixed by fitting. 2. A rolling bearing is inserted into a shaft, a pressing ring having a taper having a small diameter on the inner surface is inserted into the shaft, the inner ring of the bearing is pressed, and a taper having a small diameter on the bearing side is formed on an outer surface. The fixing ring is pressed into the shaft and the pressing ring until they come into contact with their tapered surfaces, pressed down on the bearing side, and the fixing ring is fixed to the shaft on the inner diameter side by rolling-fitting. How to fix the inner ring in the bearing. 3. The fixing force of the bearing is arbitrarily changed by arbitrarily changing the inclination of the taper.
A method for fixing an inner ring in the rolling bearing according to the above description.