JP2002087011A - Bearing device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing device for a vehicle free to lighten and easy to maintain. SOLUTION: This bearing device is constituted of a hub unit 1 for wheel mounting supported free to rotate around a shaft center 6 on a double row rolling bearing 5 supported on the car body side and a constant velocity joint 3 on one end side of which a shaft part 4 to spline-fit in an insertion hole 2 formed along the shaft center 6 on the hub unit 1 from the vehicle inner side is provided and to the other end side of which a drive shaft is interlocked and connected free to tilt, a female part 23 recessed to the vehicle inner side is formed on an end surface part on the vehicle outer side on the shaft part 4, a shaft part end part around the female part 23 is extended in diameter and deformed by making a male body 24 enter the female part 23 from the vehicle outer side free to connect to and disconnect from it, and contact pressure of the shaft part 4 and the insertion hole 2 is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle bearing device to which a disk rotor and wheels of a disk brake device in a vehicle such as an automobile are attached.

[0002]

2. Description of the Related Art Conventionally, as a vehicle bearing device of this type, a hub unit for mounting a wheel rotatably supported on a double row rolling bearing supported on a vehicle body side around an axis, and a hub unit for the hub unit are provided. A shaft portion that is spline-fitted from the vehicle inner side is provided on one end side in an insertion hole formed along the axis, and a constant velocity joint is connected to the other end side such that the drive shaft is tiltably and interlockably connected. Is well known.

[0003] In order to fix the shaft portion spline-fitted into the insertion hole so as not to play in the axial direction, conventionally, for example, as disclosed in US Pat. No. 4,336,955, The shaft part protrudes from the insertion hole toward the vehicle body outer side, a male screw part is formed in this protrusion part, and a nut is screwed to this male screw part and tightened, so that the nut and the hub unit are crimped. In addition, there is known a device in which a hub unit and a shaft portion are pressed and fixed.

[0004] In addition, although not shown in the related art, an annular groove or an annular step formed on the outer periphery of the shaft portion,
By a retaining ring such as a circlip which is engaged with an inner periphery of the insertion hole or an annular groove formed at an end portion of the insertion hole on the vehicle outer side, the shaft portion spline-fitted into the insertion hole in the axial direction. There is a known fixing device that does not settle.

[0005]

However, in the former fixing structure of the prior art, the end of the shaft portion on the vehicle outer side protrudes from the insertion hole, and a nut for screwing to the protruding portion is used. Therefore, there is a problem that the weight increases and the weight cannot be reduced.

[0006] On the other hand, the above-mentioned conventional fixing structure has a problem that, when it is desired to remove the shaft portion from the hub unit for maintenance, it is difficult to remove the retaining ring because the retaining ring is difficult to remove.

An object of the present invention is to provide a vehicle bearing device which can be reduced in weight and can be easily maintained.

[0008]

According to a first aspect of the present invention, a double row rolling bearing supported on a vehicle body is rotatably supported around an axis. A hub unit for mounting the wheel, and a shaft portion that is spline-fitted from the vehicle inner side to an insertion hole formed along the shaft center in the hub unit on one end side, and a drive shaft on the other end side. A vehicle bearing device comprising a constant velocity joint that is tiltably and interlockably connected to a hub unit, wherein an end surface of the shaft portion on a vehicle outer side includes:
A female part recessed on the vehicle inner side is formed, and a male body is detachably inserted into the female part from the vehicle outer side to expand and deform the end of the shaft part around the female part. It is characterized by increasing the contact pressure with the insertion hole.

According to the first aspect of the present invention, the male body is detachably inserted into the female portion formed on the shaft portion, so that the end of the shaft portion around the female portion is enlarged in diameter. ,
Thus, the contact pressure between the shaft portion and the insertion hole is increased, and the shaft portion and the insertion hole can be held so as to prevent the shaft portion and the insertion hole from rattling or being unduly misaligned. Therefore, in order to allow the male body to enter the female part and expand the diameter of the shaft part around the female part, the vehicle outer side end of the shaft part is directed outward from the vehicle outer side end of the insertion hole. It does not have to protrude. Therefore, it is not necessary to project the end of the shaft portion toward the vehicle outer side from the insertion hole. In contrast, a small male body is sometimes used, so that the overall weight can be reduced. When performing maintenance,
By pulling out the male body from the female part, the shaft part around the female part returns to the original state within the range of elastic deformation so that the diameter expansion deformation decreases, so it is easy to pull out the shaft part from the hub unit Can be done.

A vehicle bearing device according to a second aspect of the present invention is the vehicle bearing device according to the first aspect, wherein the female portion is formed to have a tapered shape in which the female body is formed. The male member is formed into a tapered shape, and the male body is press-fitted into the female portion.

According to the configuration of the second aspect of the present invention, the end of the shaft portion is expanded and deformed by a simple operation of simply press-fitting the male body into the female portion, and the contact between the shaft portion and the insertion hole is made. The pressure is increased so that the shaft and the insertion hole can be held in the axial direction without rattling or unjustified displacement.
The bus unit and the shaft portion can be fixed so as not to rattle or unduly shift in the axial direction. Further, since the press-fitted male body can be relatively easily extracted from the female portion by using an extraction tool or an extraction hydraulic device, the separation between the bus unit and the constant velocity joint can be easily performed. Maintenance can be performed quickly and easily.

According to a third aspect of the present invention, there is provided a bearing device for a vehicle according to the first aspect, wherein the female portion is formed as a female taper screw having a narrow inside. Is formed into a tapered male taper screw, and the male body is screwed to the female portion.

According to the configuration of the third aspect of the present invention, the male body is screwed into the female portion, so that the end of the shaft portion is deformed so as to expand in diameter, and is pressed against the insertion hole. As a result, the contact pressure between the shaft portion and the insertion hole is increased, so that the shaft portion and the insertion hole can be fixed so as to prevent the shaft portion and the insertion hole from rattling or being unduly misaligned. Also, by releasing the screwed male body from the female body, the male body can be pulled out from the female part by relatively simple work, so that the bus unit and the constant velocity joint can be easily separated, Maintenance can be performed quickly and easily.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of the present invention.
And an example of an embodiment according to claim 2 is shown.

As shown in FIG. 1, a shaft portion 4 of a constant velocity joint 3 is spline-fitted into an insertion hole 2 of a hub unit 1 for mounting wheels, and the hub unit 1 is a multi-piece supported on the vehicle body side. A row rolling bearing 5 is rotatably supported around an axis 6.

A mounting flange 7 is formed on the outer peripheral surface of the hub unit 1 so as to protrude outward in the radial direction. A disk rotor and a wheel of a disk brake device (not shown) are provided at several places around the mounting flange 7. A mounting bolt 8 for fixing is penetrated.

The constant velocity joint 3 comprises a hub unit 1
The drive shaft 9 is connected to the drive shaft 9 in such a manner that the drive shaft 9 can be tilted relative to the drive shaft 9. This constant velocity joint 3
A ball 10 for tilting and guiding the hub unit 1 with respect to the drive shaft 9, a bowl-shaped guide portion (hereinafter referred to as an outer ring) 13 in which an inner ring 11 and a retainer 12 of the ball 10 are stored, The shaft portion 4 is integrally provided on the small diameter side (vehicle outer side). Also, in FIG.
Of the hub unit 1 is in contact with the vehicle inner side end surface.

Reference numeral 14 denotes a sealing boot for sealing the constant velocity joint 3, which is arranged so that one end covers the outer ring 13 open side of the constant velocity joint 3 and the other end covers a partway of the drive shaft 9. Have been.

The double row rolling bearing 5 has a plurality of balls 15 and 16 as rolling elements arranged in two rows, and these balls 15 and 16
And two inner races 17, an inner race and an outer race 18. The hub unit 1 and the annular inner race member 20 fitted to the vehicle inner side of the hub unit 1 are used as the raceways of the inner race. . That is, one ball 15
The outer peripheral surface of the hub unit 1 is used as the raceway surface of the row,
The outer peripheral surface of the annular inner race member 20 is used as the raceway surface of the other 16 rows of balls. The outer race 1 of the double row rolling bearing 5
A radially outward mounting flange 21 which is bolted to a vehicle body or the like is formed on an outer peripheral surface of the vehicle body 8.

The outer race 18 of the double row rolling bearing 5 is arranged such that the outer end surface of the outer race 18 is close to the mounting flange 7 of the hub unit 1.

Further, the vehicle outer side and the vehicle inner side of the double row rolling bearing 5 and the hub unit 1 (the annular inner ring member 2)
0) is sealed with a contact-type sealing material 22.

As shown in FIGS. 1 and 2, the end of the shaft portion 4 made of a metal material such as a steel material on the vehicle outer side is more outward than the end of the insertion hole 2 of the hub unit 1 on the vehicle outer side. Dimensions so that they do not protrude
A truncated cone-shaped recess centered on the axis 6 of the shaft 4 is formed in an end surface of the shaft 4 on the vehicle outer side. The recess forms a female portion 23. The inner peripheral surface of the female portion 23 is processed relatively smoothly. Further, a male body 24 having a truncated conical outer shape to be fitted into the female portion 23 from the vehicle outer side is prepared, and the male body 24 is beaten into the female portion 23 with a hammer or the like, so that the male body 24 is female. Press-fit into the part 23.

The male body 24 is formed of a metal material such as steel, for example, as shown in FIG.
The inclination angle of the taper with respect to the axis 6 is set to be the same as the taper of the inner peripheral surface of the female portion 23. In addition, the inclination angle of the taper of the male body 24 with respect to the axis 6 may be set to be slightly obtuse angle side, that is, larger than the taper of the inner peripheral surface of the female portion 23. Further, as a structure for press-fitting the male body into the female portion in this manner, for example, the female portion is formed with a bottom and a columnar shape centered on the axis, and the male body is slightly larger than the inner diameter of the female portion. A cylindrical body having a diameter may be formed by chamfering the taper so that only the tip part can be smoothly fitted to the female part. Even with such a structure, when the male body is pressed into the female part, it is accompanied by the press-fitting. As a result, the shaft around the female portion expands in diameter outwardly, and the shaft is pressed against the inner peripheral surface of the insertion hole.

When the male body 24 is pressed into the female portion 23, the peripheral portion of the female portion 23 in the shaft portion 4 is elastically moved radially outward by the male body 24 being pressed against the female portion 23. The outer peripheral portion of the shaft portion 4 is strongly pressed against the inner peripheral portion of the insertion hole 2 at that portion, so that the shaft portion 4 and the hub unit 1 are fixed, and the constant velocity joint 3 The hub unit 1 is integrated.

In FIG. 2, reference numeral 25 denotes a male body 24.
Of the male body 24
For releasing the air from the female portion 23 when press-fitting. Note that it is also possible to inject pressure oil from the hole 25 using a hydraulic device and to extract the male body 24 from the female portion 23 using the static pressure of the pressure oil. And male 24
, The diameter expansion deformation of the portion around the female portion 23 in the shaft portion 4 elastically returns to the original diameter.
Can be easily removed from the insertion hole 2, and in the case of maintenance, the hub unit 1 and the constant velocity joint 3 can be easily separated.

Next, the constant velocity joint 3 is attached to the hub unit 1.
The procedure for assembling is described. First, the vehicle outer side of the shaft portion 4 of the constant velocity joint 3 is aligned with the insertion hole 2 and pushed into the insertion hole 2. Then, the insertion hole 2
The shaft unit 4 is spline-fitted to the hub unit 1
And the shaft portion 4 are integrally mounted rotatably around the shaft center 6.

When the small-diameter end surface of the outer race 13 is inserted into contact with the vehicle inner end surface of the hub unit 1,
The end surface of the shaft portion 4 on the vehicle outer side is the insertion hole 2 of the hub unit 1.
Almost coincides with the edge of. In that state, male body 24
Is pressed into the female portion 23, whereby the shaft portion 4, and thus the constant velocity joint 3, are fixed so as to be integral with the hub unit 1.

(Another Embodiment) Next, an embodiment of a vehicle bearing device according to claim 3 of the present invention will be described.
It is to be noted that the same reference numerals are given to the same structures as those in the above-described embodiment, and the description thereof is omitted.

As shown in FIGS. 3 and 4, the shaft 4 of the constant velocity joint 3 is spline-fitted into the insertion hole 2 of the hub unit 1, and is formed at the end of the shaft 4 on the vehicle outer side. By screwing and fastening the male body 24 to the female portion 23, the portion around the female portion 23 of the shaft portion 4 is expanded and deformed.
At the enlarged and deformed portion, the shaft portion 4 and the insertion hole 2 are strongly crimped, and the hub unit 1 and the constant velocity joint 3 are fixed.

That is, the female portion 23 is formed in a truncated conical shape, and a tapered female screw is formed in the inner peripheral portion thereof. On the other hand, the outer shape of the male body 24 is also formed in a truncated conical shape. The male member 24 has a tapered male screw formed on the outer periphery thereof, so that the male member 2
4 can be screwed on. Therefore,
As the male body 24 is screwed into the female portion 23, a portion of the shaft portion 4 around the female portion 23 is expanded and deformed, and the outer peripheral portion of the shaft portion 4 is inserted into the insertion hole at that point. 2, the hub unit 1 and the constant velocity joint 3 are fixed to each other. In FIG. 4, reference numeral 26 denotes a wrench fitting hole for fitting an operating portion of a wrench such as a hexagon wrench in the male body 24 to screw and unscrewing the male body 24 from the female portion 23. is there.

In the above-described embodiment, the male body having the taper is fitted into the female part. However, the male body having no taper, that is, the cylindrical male body is formed in the cylindrical concave hole. May be fitted to the female part. Also, only one of the male body and the female part may be provided with a taper.

In the above embodiment, the hub unit constitutes a part of the inner race of the bearing. However, the hub unit and the bearing may not have a common part.
That is, the hub unit and the bearing may be separate bodies, and the inner ring of the bearing may be fitted on the outer periphery of the hub unit.

[0033]

As is apparent from the above description, the present invention provides a female member formed on a shaft portion of a shaft portion without projecting the vehicle outer end portion from the vehicle outer side end portion of the insertion hole. By having the male body detachably enter the part, the end of the shaft part around the female part will be enlarged,
The contact pressure between the shaft portion and the insertion hole is increased, so that the shaft portion and the insertion hole can be held so that the shaft portion and the insertion hole do not rattle or unduly displace. Also, the end of the shaft does not have to protrude toward the vehicle outer side from the insertion hole, and since the male body is fitted into the female part formed to be concave in the end of the shaft, it is fastened with a nut as in the conventional case. In contrast, a small male body is sometimes used, so that the overall weight can be reduced. Further, when performing maintenance, the male body is pulled out from the female portion, so that the shaft portion around the female portion returns to the original state within the range of elastic deformation so that the diameter expansion deformation is reduced, so that the shaft is removed. It can be easily extracted from the hub unit.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view showing a vehicle bearing device according to a second embodiment of the present invention.

FIG. 2 is an enlarged view of a main part in FIG. 1;

FIG. 3 is a longitudinal sectional front view showing a vehicle bearing device according to a third embodiment of the present invention;

FIG. 4 is an enlarged view of a main part in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hub unit 2 Insertion hole 3 Constant velocity joint 4 Shaft 5 Double row rolling bearing 6 Shaft center 9 Drive shaft 23 Female part 24 Male body

Claims (3)

[Claims] 1. A hub unit for mounting a wheel rotatably supported on a double row rolling bearing supported on a vehicle body side around an axis, and an insertion hole formed in the hub unit along the axis. A bearing device for a vehicle, comprising: a shaft portion that is spline-fitted from the vehicle inner side at one end side; and a constant velocity joint that is connected to the other end side such that a drive shaft is tiltably linked to the hub unit. A female portion recessed toward the vehicle inner side is formed at an end surface portion of the shaft portion on the vehicle outer side, and a male body is detachably inserted into the female portion from the vehicle outer side, thereby forming a shaft end around the female portion. A bearing device for a vehicle, wherein a diameter of a portion is deformed to increase a contact pressure between the shaft portion and the insertion hole. 2. The vehicle bearing device according to claim 1, wherein the female portion is formed to have a taper having an inner taper, and the male body is formed to have a taper having a tapered inner portion. A vehicle bearing device wherein a body is press-fitted into the female portion. 3. The bearing device for a vehicle according to claim 1, wherein the female portion is formed as a tapered female taper screw, and the male body is formed as a tapered male taper screw. A bearing device for a vehicle, wherein the male body is screwed to the female portion.