JPS6360249B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in the shaft end structure of an axle for fixing the inner ring of a vehicle bearing.

A conventional axle shaft end structure for fixing the inner ring of a vehicle bearing to the shaft includes, for example, a bearing support portion of an axle 1 having a labyrinth ring 6 and a spacer 7, as shown in FIG. , press-fit into the inner ring 2 of a double-row cylindrical roller bearing attached to the axle box with an interference margin, tighten and fix it with a nut 3 screwed into the screw at the end of the shaft, and place it between the protrusions of the nut 3. key 4
, and use bolt 5 to prevent loosening. However, the axle 1 requires careful consideration in terms of material, heat treatment, and processing in order to protect the threaded portion, which tends to increase costs, and if a screw hole is provided at the end of the shaft to prevent loosening, magnetic flaw detection of the shaft is required. It has drawbacks that can easily become an obstacle during inspection.

The present invention aims to eliminate the drawbacks of the above-mentioned conventional example,
That is, the purpose of this invention is to provide an axle shaft end structure that does not require screws at the end of the axle and is suitable for magnetic flaw detection.

In order to achieve the above object, the present invention provides an axle shaft end structure having an inner ring pressing member that contacts the end surface of the inner ring of a vehicle bearing and presses the inner ring in the direction opposite to the shaft end to fix the inner ring to the axle. is formed on the axle and has a large diameter portion on the shaft end side; and a shaft end pressing member that is disposed on the small diameter portion of the axle and has a side wall and a bolt threading hole that is pressed against the step. , a tightening means including a tightening bolt that is screwed into a bolt fitting hole of the shaft end pressing member and applies a force in the direction of the shaft end to the shaft end pressing member to press the side wall of the shaft end pressing member against the stepped portion; The fixing means is configured to press the inner ring pressing member in the direction opposite to the shaft end by a reaction force from the stepped portion due to the pressing force of the means, thereby fixing the inner ring to the axle.

Embodiments of the present invention will be described below with reference to the drawings.

Fig. 2 is a cross-sectional view of the main part of the shaft end structure of the axle.
A circumferential groove is formed at the shaft end of the axle 1, and the side wall on the shaft end side is a tapered surface 1A that slopes toward the shaft end as it progresses outward in the radial direction, while the side wall on the opposite shaft end is formed along the axis line. It is a perpendicular plane. An inner ring 2 of a double-row cylindrical roller bearing is fitted into an intermediate portion of the axle 1 with an appropriate clearance.

A plurality of fan-shaped sliding members 4 are fitted into the circumferential groove with gaps in the circumferential direction. Each sliding member 4 has tapered surfaces 4A and 4B on the outer and inner peripheral edges of one side, respectively, and one tapered surface 4B can engage with the tapered surface A of the axle 1. A seal ring 3 is interposed between the opposite end surface of the sliding member 4 and the end surface of the inner ring 2.

A guide member 5 is fitted to the shaft end of the axle 1 so as to be movable in the axial direction. It has an insertion hole with ample space in the radial direction. After passing through the insertion hole of the guide member 5, the bolt 6 is screwed into a screw hole drilled in the sliding member 4.

Next, the operation of this embodiment will be explained.

When the bolt 6 is tightened and a force is applied in the left direction in FIG. (downward in Figure 2). When the sliding member 4 moves, the bolt 6 also moves in the same direction within the insertion hole of the guide member 5. When the bolt 6 is further tightened, the tapered surface 4B of the sliding member 4 is guided by the tapered surface 1A of the circumferential groove of the axle 1, and the sliding member 4 and the guide member 5 move toward the opposite end of the shaft (rightward in FIG. 2). Moving. As a result, a force in the direction opposite to the shaft end is applied from the sliding member 4 to the inner ring 2 of the bearing via the seal ring 3.
This means that the inner ring 2 is fixed to the axle 1.

That is, in this embodiment, the tapered surface 1A between the shaft end of the axle and the groove bottom of the circumferential groove serves as a step, the seal ring 3 serves as an inner ring pressing member, and the sliding member 4 serves as a shaft end pressing member. The element 5 and the bolt 6 each act as a tightening means, and the sliding element 4 also acts as a fixing means.

According to this embodiment, it is only necessary to form a circumferential groove on the axle 1, and there is no need for a separate member to serve as a stopper or a means for adjusting the position of the stopper or a means for fixing the stopper, making it extremely simple and inexpensive. The overall length can be almost the same as the conventional one, and this shaft end structure does not increase the cost of the shaft at all.

In the above embodiment, a seal ring 3 is interposed between the end face of the bearing inner ring 2 and the sliding member 4, and the sliding member 4 presses the end face of the inner ring 2. However, in addition to this, the seal ring 3 is omitted. Change as appropriate, such as making the sliding member 4 directly press the end face of the inner ring 2,
Improvements can be made.

As described above, according to the shaft end structure according to the present invention, the screws and nuts at the shaft end that were conventionally required can be omitted, and a screw hole on the shaft end surface is also unnecessary, allowing reliable magnetic flaw detection inspection. The effect of being able to do things is produced.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventionally used axle, and FIG. 2 is a sectional view of a main part of a typical embodiment of an axle end structure according to the present invention. Explanation of symbols of main parts, 1... Shaft, 1A... Tapered surface, 2... Bearing inner ring, 3... Seal ring, 4... Lubricating member, 4A, 4B... Tapered surface, 5... Guide member, 5
A...Tapered surface.

Claims (1)

[Scope of Claims] 1. An axle shaft end structure having an inner ring pressing member that contacts an end surface of an inner ring of a vehicle bearing and presses the inner ring toward the opposite end of the shaft to fix the inner ring to the axle, comprising: a stepped portion formed on the axle and having a large diameter portion on the shaft end side; a shaft end pressing member disposed on the small diameter portion of the axle and having a side wall pressed against the stepped portion and a bolt threading hole; Screwed into the bolt screw hole of the shaft end pressing member,
a tightening means including a tightening bolt that applies a force in the direction of the shaft end to the shaft end pressing member to press the side wall thereof against the step; and a reaction force from the step due to the pressure of the tightening means. 1. A shaft end structure for an axle, comprising a fixing means for pressing an inner ring pressing member in a direction opposite to the shaft end and thereby fixing the inner ring to the axle. 2 Press the inner ring of the vehicle axle toward the opposite end of the axle,
In an axle end structure for fixing an inner ring to an axle, the axle end side wall formed on the axle and serving as a step has a circumferential groove with a tapered surface whose outer circumferential side is inclined toward the axle end side, and a circumferential groove on one side. First and second on the outer peripheral edge and the inner peripheral edge, respectively.
A plurality of fan-shaped sliding members each having a tapered surface, having a bolt threading hole, and serving as a shaft end pressing member and a fixing means, arranged in the circumferential groove with a gap in the circumferential direction. a sliding member whose second tapered surface is capable of engaging with the tapered surface of the circumferential groove; a ring-shaped inner ring pressing member interposed between the inner ring and the sliding member; and an axial end of the axle. a guide member that is fitted into the sliding member, has a tapered surface that engages with the first tapered surface of the sliding member, and is part of a tightening means that has a bolt insertion hole that is elongated in the radial direction; a tightening bolt that is part of a tightening means that passes through the bolt insertion hole of the guide member and then screws into the bolt threading hole of the sliding member, and when the tightening bolt is tightened, the sliding member is attached in the axial end direction. by applying a force to move the sliding member radially inward relative to the guide member through engagement between the first tapered surface of the sliding member and the tapered surface of the guide member, and further tightening the tightening bolt. , the sliding member and the guide member are moved in the direction opposite to the axle through the engagement between the second tapered surface of the sliding member and the tapered surface of the circumferential groove of the axle, and the inner ring is moved through the inner ring pressing member. An axle shaft end structure characterized in that the inner ring is fixed to the axle by moving in the direction opposite to the axle end.