JPH0673459U - Wheel support device - Google Patents

Abstract

(57) [Abstract] [Purpose] In a device for supporting a wheel on an axle by means of a hub and a bearing, the load applied from the wheel to the axle is reduced, and the required strength of the axle is reduced. [Structure] A serration portion 1 provided on the outer periphery of the end portion of the axle 1.
The hub 3 is fitted to the hub 6, and the hub 3 and the shoulder portion 1 of the axle 1 are
The inner ring 4 is press-fitted into the space 5. The mounting flange 13 is integrally formed on the outer ring 5, and the outer ring 5 and the inner ring 4 are
Double row rolling surfaces 10, 11 and 8, 9 for accommodating balls 12
To provide. The hub 3 and the inner ring 4 are axially tightened by the nut 25 to be fixed to the axle 1, and the outer ring 5 is attached to the mounting flange 1
It is fixed to the axle tube 2 by means of 3, and the moment load applied from the wheel is received by the bearing constituted by the outer ring 5 and the inner ring 4.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a supporting device for supporting a vehicle wheel on an axle.

[0002]

[Prior art]

 2. Description of the Related Art Conventionally, there is a device having a structure as shown in FIG. 2 as a device for supporting wheels on both ends of an axle of an automobile.

In this device, a hub 33 is formed integrally with the axle 31 at the end of the axle 31 exposed from the axle tube 32, and wheels 34 are attached to the hub 33 via bolts. Further, a deep groove ball bearing 36 or a tapered roller bearing or a roller bearing is provided between the outer circumference of the axle 34 and the hub casing 35 fixed to the end of the wheel tube 32. The bearing 36 rotatably supports the axle 31. ing.

[0004]

[Problems to be solved by the device]

 In the device shown in FIG. 2, since the axle 31 and the hub 33 are integrally formed, the axle 31 has both the moment load from the wheel and the road surface and the torque (torsion force) transmitted from the engine to the wheel. Since stress acts, the shaft diameter of the axle 31 needs to be set to a size that can ensure sufficient strength to withstand the stress.

However, when the diameter of the axle 31 is increased, the axle tube 32 and the bearing 36 are increased in size, which causes a problem that the mounting space is increased and the weight is increased.

In the deep groove ball bearing 36 used in the conventional apparatus, the inner ring and the outer ring are assembled by directly press-fitting them into the axle 31 and the hub casing 35, respectively. A large bearing clearance remains in the bearing 36, which may cause play. For this reason, there is a problem that the supporting rigidity of the wheels is lowered and the operation feeling of the brake is deteriorated.

Further, since the axle 31 and the hub 33 are integrally formed, their workability is poor, and since the axle 31 becomes long, the machining accuracy of the axle 31 and the wheel mounting surface of the hub 33 are reduced. There is also a problem that it is difficult to obtain a high degree of runout accuracy.

This invention was made in order to solve the problems of the above-mentioned conventional supporting device, and it is possible to reduce the necessary strength for the axle and to support the wheel with high accuracy because the bearing clearance after installation is small. An object of the present invention is to provide a wheel support device that can be used.

[0009]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention relates to the outer peripheral surface of the inner ring, in which the hub for mounting the wheel and the inner ring of the bearing are fitted in parallel in the end peripheral surface of the axle exposed from the axle tube. The surface and the inner peripheral surface of the outer ring fitted to the outer side of the inner ring are provided with double rows of rolling surfaces that face each other in the radial direction, and a plurality of rolling elements are provided between the facing rolling surfaces. The structure is such that the mounting flange for fixing the outer ring to the wheel tube is integrally formed on the outer peripheral surface of the outer ring.

In the above structure, the hub is connected to the axle via a rotation stopping means that allows axial movement, and the hub is connected to the protrusion provided on the circumferential surface of the axle. The inner ring may be tightened.

[0011]

[Action]

 In the supporting device having the above structure, the outer ring is fixed to the axle tube by using the mounting flange, and both the hub and the inner ring are fixed to the axle. In this structure, the engine torque is transmitted to the wheels via the axle and hub, but the thrust load and moment load applied from the wheels to the axle are generated by the bearing consisting of the outer and inner rings that are axially aligned via the hub. Be accepted. Therefore, the axle is not directly subjected to the thrust load or bending moment from the wheels, and the axle diameter of the axle can be set small. Also, since the flange and axle are separate structures, the workability of each is improved.

Further, since the outer ring of the bearing is fixed to the axle tube via the mounting flange, the amount of clearance remaining in the bearing after assembly is smaller than that of the structure in which the outer ring is directly press-fitted into the axle tube. You can

[0013]

【Example】

 FIG. 1 shows a wheel support device of the embodiment. A shoulder portion 14, a land portion 15, a serration portion 16 and a screw portion 17 are formed on the end portion of the axle 1 in this order from the back side, and a portion on the tip side from the land portion 15 is exposed from the end portion of the axle tube 2. is doing.

A cylindrical portion 19 of the hub 3 is fitted to the serration portion 16, and a flange 18 for mounting a wheel (not shown) is integrally formed on the front end of the hub 3.

The inner ring 4 of the bearing is fitted on the outer periphery of the land portion 15. The inner ring 4 is formed of two ring members 6 and 7 that can be divided in the axial direction, and ball rolling surfaces 8 and 9 are formed on the outer peripheral surfaces of the ring members 6 and 7, respectively. .

On the other hand, the outer ring 5 is fitted on the outer side of the inner ring 4, and the inner peripheral surface of the outer ring 5 has a double row of rolling surfaces 10 radially opposed to the rolling surfaces 8 and 9 of the inner ring 4. , 11 are formed. Between the rolling surfaces 8 and 10 and the rolling surfaces 9 and 11 of the inner and outer wheels facing each other, a plurality of balls 12 respectively held by a retainer 20 are incorporated. Between 10 and 9, 11 and the ball 12, a double row angular contact ball bearing that receives thrust loads in mutually opposite directions is configured.

A mounting flange 13 is integrally formed on the outer peripheral surface of the outer ring 5, and the mounting flange 13 is fixed to a flange 21 provided at an end portion of the axle tube 2 via a bolt 22. It is supposed to be done.

Sealing members 23 and 24 are provided at both ends of the inner peripheral surface of the outer ring 5 to close a gap between the outer ring 5 and the outer peripheral surface. The seal members 23 and 24 seal the inside of the bearing from the outside. ing.

In the supporting device of the embodiment having the above structure, the hub 3 is axially pressed by the nut 25 screwed into the threaded portion 17 of the axle 1 so that the hub 3 and the inner ring 4 are shouldered to the axle 1. Tighten and fix to part 14. Further, the outer ring 5 is fixed to the axle tube 2 by using the mounting flange 13 and the bolt 22.

In this assembled state, the engine torque applied to the axle 1 is transmitted to the wheels via the serration portion 16 and the hub 3. Further, the load from the wheel toward the axle 1, that is, the radial load due to the vehicle weight, and the thrust load and the moment load due to the turning of the automobile are interposed between the hub 3 and the axle tube 2 via the hub 3. It is received by a bearing (composed of the inner ring 4, the outer ring 5, and the balls 12). Therefore, thrust load and bending moment from the wheels do not act on the axle 1 directly.

In the apparatus of the embodiment incorporated as described above, the only things that affect the bearing clearance before and after the bearing is assembled are the fastening of the hub 3 and the inner ring 4 by the nut 25 and the press fitting of the inner ring 4 and the hub 3. Since this is much smaller than the effect of directly press-fitting the outer ring, the range of residual clearance after assembly can be reduced as a result. Also, by changing the tightening force of the nut 25, the preload adjustment on the bearing can be easily performed.

Since the axle 1 and the hub 3 can be formed separately, the axle 1 and the hub 3 can be manufactured and assembled more easily than the conventional integrated structure shown in FIG. 2, and the processing accuracy of the axle 1 and the hub 3 can be improved. The runout accuracy of the wheel mounting portion of 3 can be entered with high accuracy.

In the embodiment described above, the double row angular ball bearing in which the balls 12 are incorporated between the inner ring 4 and the outer ring 5 is shown as a bearing for supporting the axle 1 and the hub 3. Can have any structure as long as it can receive thrust loads in both directions. For example, a double row tapered roller bearing can be used.

In addition to the serration described above, the detent means for connecting the hub 3 to the axle 1 may be a spline or a combination structure of a key and a key groove.

[0025]

【effect】

 As described above, in this invention, the hub and the bearing are arranged in parallel in the axial direction, the outer ring of the bearing is fixed to the axle tube by the mounting flange, and the moment load and thrust load applied from the wheel are received by the bearing. Therefore, the required strength for the axle can be set low, and the device can be made compact by reducing the axle diameter of the axle.

Since the outer ring is fixed using the mounting flange and is not press-fitted into the axle tube, the residual clearance of the bearing after assembly can be made smaller than that of the conventional structure in which the inner and outer rings are press-fitted. It is possible to improve the performance of the bearing and the workability of assembling.

Further, since the hub and the axle can be formed separately, the hub and the axle can be easily manufactured, and the processing accuracy and the assembly accuracy can be improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a supporting device according to an embodiment.

FIG. 2 is a sectional view showing a conventional example.

[Explanation of symbols]

 1 Axle 2 Axle tube 3 Hub 4 Inner ring 5 Outer ring 6,7 Ring member 8, 9, 10, 11 Rolling surface 12 Ball 13 Mounting flange 25 Nut

Claims (2)

[Scope of utility model registration request] 1. An end peripheral surface of an axle exposed from an axle tube,
The hub on which the wheel is mounted and the inner ring of the bearing are fitted in parallel in the axial direction, and the outer circumferential surface of the inner ring and the inner circumferential surface of the outer ring fitted to the outer side of the inner ring face each other in the radial direction. A wheel support in which a double-row rolling surface is provided, a plurality of rolling elements are incorporated between the facing rolling surfaces, and a mounting flange for fixing the outer ring to the wheel tube is integrally formed on the outer peripheral surface of the outer ring. apparatus. 2. The hub is connected to an axle via a detent means that allows axial movement, and the inner ring is tightened between the hub and a protrusion provided on the circumferential surface of the axle. The wheel support device according to claim 1.