JP2001254749A - Bearing device for axle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing device for an axle requiring no cutting out and grooving machining in a shaft end of a rotary shaft member, no alignment jig in stopping the looseness of a nut, with easy working on the nut. SOLUTION: In the bearing device for the axle with a roller bearing disposed on the shaft, and with an inner ring member of the roller bearing fixed to the shaft end portion by a nut to be screwed to the shaft end, a plurality of recesses 6 are formed circumferentially on an inner circumferential portion of an outer end surface 5a of the nut 5, an outer circumferential portion of a shaft end face 8 is expanded 8a in the radial direction by the whole circumferential caulking and abutted on the outer end face 5a of the nut 5, and a part of the expanded portion 8a of the shaft end face 8 is fitted in the recesses 6 of the nut 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a bearing device for an axle of an automobile or the like.

[0002]

2. Description of the Related Art FIG. 4 shows a conventional axle bearing device. The bearing device includes an outer race member 40 fixed to the vehicle body side, a rolling element 4 concentric with the outer race member 40 and the rolling element 4.
An inner ring member 41 disposed so as to be relatively rotatable via 3;
The rotating shaft member 4 in which the inner race member 41 is integrally connected to the shaft end side portion 42a and fixed to the wheel side by the opposite shaft end side portion 42b
The inner ring member 41 is integrally fixed to the rotating shaft member 42 by a nut 44 at a shaft end side portion 42 a of the rotating shaft member 42. The nut 44 is screwed into a screw portion 44a formed on a shaft end 42c of the rotary shaft member 42, and furthermore, a protrusion 45 provided on the nut 44 is provided at a predetermined radial position of the screw portion 44a. The nut 44 is bent into the notch groove 46 to prevent the nut 44 from rotating around the shaft end 42c, that is, to prevent the nut 44 from loosening. 47 is a retainer for holding the rolling element 43, and 48 is a sealing member for sealing between the outer ring member 40 and the inner ring member 41.

[0003]

In the bearing device for an axle having the above-described structure, the notch groove 46 must be formed in the threaded portion 44a of the shaft end 42c of the rotary shaft member 42, and the burrs are removed after the groove processing. Is required, and processing man-hours are required. Further, the shape of the nut 44 must be a special shape in which the protrusion 45 is made thin, which is troublesome. Furthermore, the notch groove 46 of the shaft end 42c and the protrusion 4 of the nut 44
Positioning with a jig for caulking and bending 5 was necessary, and a positioning mechanism for that purpose was separately required.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problem, and it is not necessary to form a notch groove in a shaft end of a rotary shaft member. It is an object of the present invention to provide an axle bearing device that becomes unnecessary and can be easily processed into a nut.

[0005]

As a means for solving the above-mentioned problems, the present invention provides a method in which a rolling bearing is arranged on a shaft, and a nut for screwing an inner ring member of the rolling bearing to a shaft end at a shaft end portion. In the fixed axle bearing device, a plurality of recesses are formed on the inner circumference of the outer end face of the nut on the circumference, and the outer circumference of the axle end face is radially expanded by caulking the entire circumference to form the outer end face of the nut. And a part of the enlarged portion of the shaft end face is fitted into the concave portion of the nut.

[0006]

1 to 3 show an axle bearing device according to an embodiment of the present invention. An outer ring member 1 fixed to the vehicle body, an inner ring member 2 concentrically disposed on the outer ring member 1 and relatively rotatable via a rolling element 4, and a shaft end portion 3
a and the inner ring member 2 is fixedly connected to the
The inner ring member 2 is integrally fixed to the rotating shaft member 3 with a nut 5 at a shaft end side portion 3a of the rotating shaft member 3. In addition, 9 is a retainer for holding the rolling elements 4 and 10 is a sealing member for sealing between the outer ring member 1 and the inner ring member 2.

As is apparent from FIG. 3, the nut 5 has an inner peripheral portion of the outer end face 5a, that is, a threaded portion 5 of the outer end face 5a.
A plurality of recesses 6 are formed on the circumference at the corner of the inner peripheral surface b. Preferably, the recess 6 is formed in a standard nut by plastic working using a press.

[0008] The nut 5 is screwed into a screw portion 7 formed on the shaft end side portion 3a to fix the inner race member 2. By expanding the entire circumference of the outer peripheral portion of the shaft end surface 8 in the radial direction by caulking the entire circumference of the rotary shaft member 3 to the shaft end surface 8, the expanded portion 8 a formed on the outer end surface 5 a of the nut 5 is formed. , And the nut 5 is integrally fixed to the rotating shaft member 3. At this time, a part of the expanded portion 8a is simultaneously fitted into the concave portion 6 of the nut 5 to prevent the nut 5 from being loosened.

In the embodiment of the present invention, an axle bearing device (so-called third generation) is described, which is a hub unit in which a shaft member also serving as an axle, and an inner ring and an outer ring are assembled in a unit shape. However, the present invention is not limited to this. For example, an axle bearing device (so-called first generation) in which an inner ring is fitted to a hub spline-fitted to a shaft, and the inner ring is fixed to the shaft via a hub with a nut screwed to the shaft end, or a shaft. The axle bearing device (the so-called second bearing) in which the inner ring is directly fixed to the shaft and the inner ring is directly fixed to the shaft by a nut screwed to the shaft end.
Generation) and the like.

[0010]

According to the axle bearing device of the present invention,
The nut can be prevented from loosening simply by fitting a part of the entire circumferentially expanded portion of the shaft end surface of the rotary shaft member formed for fastening the nut into the plurality of recesses formed in the inner peripheral corner of the nut. Therefore, there is no need to form a notch groove at the shaft end of the rotating shaft member as in the conventional structure, and a positioning jig is not required at the time of locking work on the nut, thereby facilitating assembly.

[Brief description of the drawings]

FIG. 1 is a sectional view of an axle bearing device according to an embodiment of the present invention.

FIG. 2 is a side view of a main part as viewed from an arrow A in FIG. 1;

FIG. 3 is an outer end view of the nut as viewed in the direction of arrow A in FIG. 1;

FIG. 4 is a sectional view of a main part of a conventional axle bearing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer ring member 2 Inner ring member 3 Rotating shaft member 4 Rolling element 5 Nut 6 Concave part 7 Screw part 8 Shaft end face 8a Expanding part 9 Cage 10 Sealing member

Claims (1)

[Claims] 1. An axle bearing device in which a rolling bearing is disposed on a shaft and an inner ring member of the rolling bearing is fixed to a shaft end side portion by a nut screwed to the shaft end, an inner peripheral portion of an outer end surface of the nut. A plurality of concave portions are formed on the circumference of the shaft, and the outer peripheral portion of the shaft end surface is radially expanded by caulking the entire circumference to abut against the outer end surface of the nut, and a part of the expanded portion of the shaft end surface is removed. A bearing device for an axle, wherein the bearing device is fitted in a recess of a nut.