JPH0867109A - Bearing device for wheel - Google Patents

Abstract

PURPOSE: To provide a bearing device for wheels, in which the axial length is short and the number of parts is reduced. CONSTITUTION: An axial screw hole 6 is formed in either of an inner member 2 inserted inside a tubular outer member 1 or a bearing-inner race 5. On the other hand, a screw shaft 4 is provided, and the screw shaft 4 is screwed in the screw hole 6 to give a preload to a ball 10 incorporated between the outer member 1 and the inner member 2, and a ball 10 incorporated between the outer member 1 and the bearing-inner race 5. After the preload is adjusted, the outside peripheral part of the end face of the screw shaft 4 is staked, and a staking piece 11 formed by the staking prevents the inner member 2 and the bearing-inner race 5 from rotating in the direction of working loose.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile wheel bearing device.

[0002]

2. Description of the Related Art As a wheel bearing device for supporting non-driving wheels of an automobile, the one shown in FIG. 6 has been conventionally known. In this wheel bearing device, an inner member 42 connected to a non-driving wheel is inserted inside an outer member 41 attached to a vehicle body, and a bearing is provided on a small-diameter shaft portion 43 formed at an end portion of the inner member 42 on the insertion side. The inner race 44 is fitted and the raceway groove 4 is formed on the outer peripheral surfaces of the bearing inner race 44 and the inner member 42.
5, 46 are provided, and the inner surface of the outer member 41 is provided with a pair of raceway grooves 4 opposed to the raceway grooves 45, 46 in the radial direction.
7 and 47 are formed, and the raceway grooves 45 and 4 that face each other in the radial direction.
A ball 48 is incorporated between 6 and 47.

Further, a screw shaft 49 is provided on the end surface of the small diameter shaft portion 43, and the bearing inner ring 44 is pressed through the washer 51 by tightening the nut 50 screw-engaged with the screw shaft 49,
After applying a preload to each ball 48, a part of the end surface of the tubular portion 53 of the nut 50 is caulked to the notch 52 formed at the end of the screw shaft 49 to prevent the nut 50 from loosening,
The ball 48 is held in a preloaded state. 54 is a crimping piece.

[0004]

By the way, in the above bearing device for a wheel, the small-diameter shaft portion 4 of the inner member 42 is used.
Since the screw shaft 49 for screwing the preload adjusting nut 50 to the end face of 3 is required, there is a disadvantage that the axial length of the wheel bearing device becomes long.

A nut 50 is used to adjust the preload of the ball 48.
Since the washer 51 and the washer 51 are required, the number of parts is large, and in order to prevent the nut 50 from loosening, it is necessary to form the notch 52 for engaging the caulking piece 54 at the end of the screw shaft 49. There is also the inconvenience that it is time-consuming and costly.

An object of the present invention is that the axial length is short,
An object of the present invention is to provide a low cost bearing device for a wheel with a small number of parts.

[0007]

In order to solve the above-mentioned problems, in the present invention, a cylindrical outer member, an inner member inserted inside the outer member, and an inner member inside the outer member are provided. A pair of raceways each having an inner member and a bearing inner ring arranged coaxially, forming raceway grooves on the outer circumferences of the inner member and the bearing inner ring, and having inner raceways facing each raceway groove in the inner diameter surface of the outer member. A wheel bearing device, wherein grooves are provided, balls are installed between raceway grooves facing each other in a radial direction, and a preload is applied to the balls in multiple rows by the relative axial movement of the inner member and the bearing inner ring, A threaded hole is formed in one of the inner ring of the bearing and the inner ring of the bearing, and a threaded shaft screwed into the threaded hole is provided in the other side. It was adopted a structure in which integrating the inner ring.

Further, in another invention, instead of the screw shaft and the screw hole in the above invention being integrated by screw coupling and caulking, an axial insertion hole is formed in one of the inner member and the bearing inner ring, and the other is formed. An insertion shaft portion is provided on the shaft, the insertion shaft portion is press-fitted into the insertion hole, and the outer peripheral portion of the end surface of the insertion shaft portion is welded to the inner member, whereby the inner member and the bearing inner ring are integrated.

[0009]

As described above, by providing the inner member and the bearing inner ring with the screw hole on one side and by providing the screw shaft on the other side, the inner member and the bearing inner ring are relatively rotated to bring the two members closer to each other. A preload can be applied to the ball by moving the ball in the direction of rotation. By swaging the end surface of the screw shaft after adjusting the preload, it is possible to prevent relative rotation between the inner member and the bearing inner ring, and it is possible to maintain the ball in the preloaded state.

Further, by forming an axial insertion hole in one of the inner member and the outer member and providing an insertion shaft portion in the other, a preload is applied to the ball by press-fitting the insertion shaft portion into the insertion hole. be able to. Then, by welding the outer peripheral portion of the end surface of the insertion shaft portion to the inner member after adjusting the preload, relative movement of the inner member and the outer member in the axial direction can be prevented, and the ball can be held in the preloaded state. it can.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.

As shown in FIG. 1, an inner member 2 is inserted inside a cylindrical outer member 1 attached to a vehicle body.

A flange 3 is provided at one end of the inner member 2 so as to be connected to a non-driving wheel. A screw shaft 4 is provided at the other end of the inner member 2, and a bearing inner ring 5 having a screw hole 6 is screwed into the screw shaft 4.

The outer diameter surface of the inner member 2 and the bearing inner ring 5
Track grooves 7 and 8 are formed on the outer diameter surface of the. On the other hand, the inner surface of the outer member 1 is provided with a pair of raceway grooves 9a and 9b that face the raceway grooves 7 and 8 in the radial direction, and a ball is placed between the raceway grooves 7, 8, 9a and 9b that face each other in the radial direction. The outer member 1, the inner member 2, and the bearing inner ring 5 are supported by the ball 10 so as to be relatively rotatable.

The ball 10 is preloaded by tightening the bearing inner ring 5. After the preload adjustment, the inner member 2 and the bearing inner ring 5 are prevented from rotating in the loosening direction by caulking the outer peripheral surface of the end surface of the screw shaft 4, and the ball 10 is held in the preloaded state. Reference numeral 11 denotes a crimping piece. Reference numeral 12 denotes a seal member that prevents dust from entering the inside through openings at both ends of the outer member 1.

As described above, the bearing inner ring 5 is screwed into the screw shaft 4 provided on the inner member 2 and the bearing 10 is tightened to apply a preload to the balls 10 to compact the bearing device for a wheel in the axial direction. Can be realized.

Further, the nut 50 and the washer 5 shown in FIG.
1 is not necessary, and since the bearing inner ring 5 is prevented from loosening by forming the caulking piece 11, it is not necessary to form the notch 52 shown in FIG. 6, and the cost can be reduced.

2 to 5 show another embodiment of the present invention. In the embodiment shown in FIG. 2, a screw hole 13 in the axial direction is formed in the inner member 2 connected to the non-driving wheel, and a screw shaft 14 is provided in the bearing inner ring 5, so that the inner member 2 and the bearing inner ring 5 are relatively disposed. By the rotation, both the members 2 and 5 are moved in the approaching direction to preload the ball 10. After the preload adjustment, the outer peripheral portion of the end surface of the screw shaft 14 is caulked, and the caulking piece 15 is formed to prevent the inner member 2 and the bearing inner ring 5 from rotating in the loosening direction.

In the embodiment shown in FIG. 3, a flange 22 for connecting to a non-driving wheel is provided on the outer periphery of a cylindrical outer member 21, and an inner member 23 inserted inside the outer member 21 is connected to the vehicle body. 24 are formed.

Further, a screw hole 25 is formed in the inner member 23 in the axial direction, and a screw shaft 27 provided at the end portion of the bearing inner ring 26 is screwed into the screw hole 25, so that the inner member 23 and the bearing inner ring 26 are moved relative to each other. By rotating the two members 23, 26 toward each other, the two rows of raceway grooves 28 formed on the inner diameter surface of the outer member 21 and the raceways provided on the outer diameter surfaces of the inner member 23 and the bearing inner ring 26 are formed. A preload is applied to the ball 31 between the grooves 29 and 30.

After adjusting the preload, the outer peripheral portion of the end surface of the screw shaft 27 is caulked, and the caulking piece 32 formed by the caulking prevents the inner member 23 from rotating in the relative slack direction of the bearing inner ring 26. are doing.

In the embodiment shown in FIG. 4, the inner member 23 connected to the vehicle body is provided with the screw shaft 33, the bearing inner ring 26 is formed with the screw hole 34, and the screw shaft 3 corresponding to the screw hole 34 is formed.
By screwing in 3, the inner member 23 and the bearing inner ring 26
And are moved in a direction of approaching each other to preload the ball 31.

After adjusting the preload, the outer peripheral portion of the end surface of the screw shaft 33 is caulked, and the caulking piece 3 formed by the caulking.
5, the inner member 23 and the bearing inner ring 26 are prevented from rotating in the loosening direction, and the balls 31 are held in a preloaded state.

In the embodiment shown in FIG. 5, instead of the screw shaft 4 and the screw hole 6 of the embodiment shown in FIG. 1, an insertion shaft portion 36 is formed at the end of the inner member 2 and the insertion hole is formed in the bearing inner ring 5. 37 is provided, and the insertion shaft portion 36 is press-fitted into the insertion hole 37, and the ball 10 is preloaded by the press-fitting.

After adjusting the preload, the outer peripheral portion of the end surface of the insertion shaft portion 36 is welded to the bearing inner ring 5 to integrate the bearing inner ring 5 and the inner member 2. 38 indicates a welded portion.

In the embodiment shown in FIG. 2, instead of the screw hole 13 and the screw shaft 14, an insertion shaft portion is formed in the bearing inner ring 5, an insertion hole is provided in the inner member 2, and the insertion hole is inserted into the insertion hole. The shaft portion may be press-fitted, and after adjusting the preload of the ball 10, the outer peripheral portion of the end surface of the insertion shaft portion may be welded to the inner member 2.

Further, in the embodiment shown in FIG. 3, in place of the screw hole 25 and the screw shaft 27, an insertion hole is formed in the inner member 23, an insertion shaft portion is provided in the bearing inner ring 26, and the insertion shaft portion is inserted. After press-fitting into the hole and adjusting the preload of the ball 31, the outer peripheral portion of the end surface of the insertion shaft portion may be welded to the inner member 23.

Further, in the embodiment shown in FIG. 4, instead of the screw shaft 33 and the screw hole 34, an insertion shaft portion is formed in the inner member 23, an insertion hole is provided in the bearing inner ring 26, and the insertion shaft is inserted in the insertion hole. After press-fitting the portion and adjusting the preload of the ball 31, the outer peripheral portion of the end surface of the insertion shaft portion may be welded to the bearing inner ring.

[0029]

Since the present invention is configured as described above, it has the following effects.

According to the first aspect of the present invention, since the screw hole is formed in one of the inner member and the bearing inner ring and the screw shaft is provided in the other, the bearing inner ring is axially moved through the washer by tightening the nut. Compared to the wheel bearing device that presses, the screw shaft for screwing in the nut can be omitted, so that the axial length can be made compact and the number of parts is small, and the caulking piece can be engaged. The notch portion can be eliminated, and the cost can be reduced.

Further, in the invention described in claim 2,
Since the insertion hole is formed in one of the inner member and the bearing inner ring and the insertion shaft portion is provided in the other and the insertion shaft portion is press-fitted into the insertion hole, the same effect as the invention according to claim 1 is obtained. In addition, since the inner member and the bearing member are coupled by press fitting, the amount of press fitting can adjust the amount of preload of the ball, and the preload adjusting operation is easy.

[Brief description of drawings]

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

FIG. 2 is a sectional view showing another embodiment of the above wheel bearing device.

FIG. 3 is a sectional view showing another embodiment of the above wheel bearing device.

FIG. 4 is a sectional view showing another embodiment of the above wheel bearing device.

FIG. 5 is a sectional view showing another embodiment of the above wheel bearing device.

FIG. 6 is a cross-sectional view showing a conventional wheel bearing device.

[Explanation of symbols]

 1 Outer member 2 Inner member 4 Screw shaft 5 Bearing inner ring 6 Screw hole 7, 8, 9a, 9b Raceway groove 10 Ball 13 Screw hole 14 Screw shaft 21 Outer member 23 Inner member 25 Screw hole 26 Bearing inner ring 27 Screw shaft 28, 29 , 30 orbital groove 31 ball 33 screw shaft 34 screw hole 36 insertion shaft portion 37 insertion hole

Claims (2)

[Claims] 1. An inner member having a tubular outer member, an inner member inserted inside the outer member, and a bearing inner ring arranged coaxially with the inner member inside the outer member, the inner member comprising: A raceway groove is formed on the outer circumference of the member and the inner ring of the bearing, a pair of raceway grooves that radially face each raceway groove are provided on the inner diameter surface of the outer member, and balls are installed between the raceway grooves that face each other in the radial direction. In a bearing device for a wheel that applies a preload to a double row of balls by relative axial movement of an inner member and a bearing inner ring, a screw hole is formed in one of the inner member and the bearing inner ring, and the other screw hole is formed in the other. A bearing device for a wheel, characterized in that a screw shaft to be screwed in is provided, and an inner member and a bearing inner ring are integrated by caulking an end face of the screw shaft after adjusting a preload of a ball. 2. The bearing device for a wheel according to claim 1, wherein an axial insertion hole is formed in one of the inner member and the bearing inner ring instead of the screw shaft and the screw hole being integrated by screw coupling and caulking. Then, an insertion shaft portion is provided on the other side, the insertion shaft portion is press-fitted into the insertion hole, and the outer peripheral portion of the end surface of the insertion shaft portion is welded to the inner member to integrate the inner member and the bearing inner ring. Bearing device for wheels.