JPH0126481Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hub reducer for a vehicle, and more particularly to an improvement in the mounting structure of a stopper for axial positioning of an axle shaft.

For example, in large trucks and the like, a reduction gear is sometimes interposed between the axle shaft and the wheel hub to reduce the load torque on the transmission, differential mechanism, etc.

In such a hub reduction device, conventionally, as shown in FIG. 1, a stopper 2 for axial positioning of an axle shaft 1 is welded and fixed to the inner end surface of a hub cover 3 that covers an end of the axle shaft 1 and a reduction mechanism (not shown). It is equipped with

Note that the hub cover 3 has a cylindrical shape with one side open. Then, it rotates relative to the axle shaft 1.

However, in this configuration, the work of welding and fixing the stopper 2 must be performed in a narrow space inside the hub cover 3, which has the disadvantage that this work is very difficult to perform. Moreover, when the hub cover 3 is a press-processed product, the dimensional accuracy of the cover 3 is poor, and
Since the cover 3 is deformed due to welding strain during welding of the stopper 2, the end face position of the stopper 2 with respect to the axle shaft 1 will not be appropriate when the stopper 2 is welded. It is necessary to perform machining on the contact surface with the end surface of the axle shaft 1 to control the dimension of the thickness t of the stopper 2, and such machining is performed inside the hub cover 3 after the stopper 2 is fixed by welding. This was a troublesome and time-consuming process.

Furthermore, the stopper 2 is hardened to increase the hardness of the contact surface with the axle shaft 1, but it is extremely difficult to perform such processing on the stopper 2 welded to the hub cover 3. In view of this, there is a method of hardening the stopper 2 alone, but this method has the disadvantage that the stopper 2 is relatively thin and hardens back during welding.

Incidentally, the drive wheel device for a vehicle shown in Japanese Utility Model Application No. 51-28617, the differential reduction drive device for a vehicle shown in Japanese Utility Model Application No. 52-61815, and the driving wheel device shown in Japanese Utility Model Application No. 55-15185. In a drive device, a structure is disclosed in which a drive shaft, an axle, and an input shaft are locked to protrusions provided on a member equivalent to a hub cover, but all of the protrusions shown in these publications are attached to a member equivalent to a hub cover. The position of the protrusion tip surface relative to the drive shaft, axle, and input shaft is immovable and cannot be adjusted.If this technology is applied to the axial positioning stopper of the axle shaft of the hub reduction device mentioned above, the stopper The same problem occurs as when fixing by welding, and the above problem cannot be solved in any way.

Therefore, in view of the above-mentioned conventional circumstances, the present invention was developed by inserting a stopper, which is used for axial positioning of the axle shaft and whose surface facing the axle shaft is hardened, through the hub cover wall, and is attached to the outer wall surface of the hub cover. By welding the stopper to the side, the work of welding and fixing the stopper is facilitated, and the mounting position of the stopper relative to the axle shaft can be freely adjusted, eliminating the need for dimensional control of the stopper, etc., all of the above-mentioned drawbacks are overcome. The present invention provides a hub reducer for a vehicle that eliminates the problem.

Hereinafter, one embodiment of the present invention will be described based on FIG. 2.

In the figure, an axle shaft 1 has an inner end connected to an output shaft of a transmission via a differential mechanism (not shown), and an outer end connected to a wheel hub via a speed reduction mechanism (not shown). The hub cover 3 has a cylindrical shape with one end open, and is fitted onto the wheel hub so as to cover the outer end of the axle shaft 1 and the speed reduction mechanism. Then, the hub cover 3 rotates relative to the axle shaft 1.

A hole 3A for attaching a stopper for axial positioning of the axle shaft 1 is bored in the end wall of the hub cover 3 in the direction of the central axis of the axle shaft 1. The stopper 12 is formed to have a diameter that matches the diameter of the mounting hole 3A.

When installing the stopper 12, the hub cover 3 is assembled to the jig, and then the stopper 12 is attached.
2 into the mounting hole 3 from the outside of the hub cover 3.
Penetrate it through A and bring it into contact with the jig. After that, the stopper 12 is welded and fixed from the outer end surface side of the hub cover 3.

According to this stopper mounting structure, the stopper 12 can be welded on the outside of the hub cover 3, so the work space is not narrowed like in the conventional case and can be taken freely, making welding work easier and improving work efficiency. It is possible to aim for

Furthermore, the gap l between the end surface of the axle shaft 1 and the inner end surface of the hub cover 3 is not constant for each product due to the poor dimensional accuracy of the hub cover 3;
When inserting into A, the hub cover 3 of the stopper 12
If the stopper 12 is welded and fixed after adjusting the protruding length of the axle shaft in one axial direction from the inner surface of the end wall to make the position of its tip surface appropriate, there will be no problem with the contact surface of the stopper with the axle shaft as in the conventional method. There is no need to perform time-consuming machining to control the size of the stopper thickness, and there is an advantage that the stopper installation work can be reduced by one step. Also, stopper 12
If you put it in contact with the jig and weld it to the hub cover 3,
Since the stopper 12 can be fixed while eliminating the deformation of the cover 3 due to welding strain, the end face position of the stopper 12 will not be shifted due to the above-mentioned deformation of the cover 3 and will be accurate.

Furthermore, when hardening the stopper 12 to increase the hardness of the contact surface of the stopper 12 with the axle shaft 1, even if the stopper 12 is hardened alone, the welded part of the stopper 12 will not touch the axle shaft 1. Since the part is relatively distant from the contact surface of the hub cover 3, it is possible to reduce the decrease in the hardness of the contact surface due to welding compared to the conventional method, and there is no need to adopt a method of hardening the stopper 12 after welding it to the hub cover 3. There is no difficulty in quenching.

As explained above, according to the present invention, the stopper for positioning the axle shaft in the axial direction and having a hardened surface facing the axle shaft has a cylindrical shape with one end open, and the stopper is used to position the axle shaft in the axial direction. The other end wall of the hub cover that covers the end portion and the speed reduction mechanism and rotates relative to the axle shaft is penetrated, and the length of the axle shaft axially protruding from the inner surface of the cover end wall is adjusted, and then the outer surface of the hub cover end wall is inserted. The configuration in which the stopper is fixed by welding to the axle shaft simplifies the welding and fixing work, and the position of the stopper relative to the end surface of the axle shaft can be easily adjusted, so there is no need to manage the dimensions of the stopper as in the past. With regard to hardening, the workability is improved, and the overall ease of attaching the stopper can be improved, and the cost can be reduced, which is a great practical effect.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing a stopper mounting structure in a conventional vehicle hub reducer, and FIG. 2 is a longitudinal sectional view showing a stopper mounting structure in a vehicle hub reducer according to the present invention. 1...Axle shaft, 3...Hub cover,
3A...stopper mounting hole, 12...stopper,
a...Welded part.

Claims (1)

[Scope of utility model registration request] In a vehicle hub reducer having a reduction mechanism between an axle shaft end and a wheel hub, a stopper for positioning the axle shaft in the axial direction and having a hardened surface facing the axle shaft is provided at one end. has an open cylindrical shape, and passes through the other end wall of the hub cover that covers the end of the axle shaft and the speed reduction mechanism and rotates relative to the axle shaft, and the axle shaft protrudes in the axial direction from the inner surface of the end wall of the hub cover. A hub reducer for a vehicle, the length of which is adjusted and fixed by welding to the outer surface of an end wall of a hub cover.