JP4038982B2 - Hub unit for vehicles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle hub unit.
[0002]
[Prior art]
In general, there is an axle device used on the drive wheel side of a vehicle as shown in FIG. The axle device 50 includes a drive shaft 51, a first constant velocity joint 52 (a tripod joint is used) that is attached to a vehicle inboard side (hereinafter simply referred to as “inner side”) and coupled to a differential device; A hub unit 53 attached to the vehicle outboard side of the drive shaft 51 (hereinafter simply referred to as “outer side”) is provided.
[0003]
The hub unit 53 includes a hub wheel 54 for mounting a wheel (brake disc rotor) (not shown), and a second constant velocity joint 56 (ball ball) in which a rotation shaft 55 is inserted and supported integrally in an insertion hole of the hub wheel 54. And a double row rolling bearing 57 for rotatably supporting the hub wheel 54 and the second constant velocity joint 56 around the axis.
[0004]
The second constant velocity joint 56 includes an outer ring 58 formed in a bowl shape that opens the inner side, and the rotary shaft 55 that is integrally formed on the outer side of the outer ring 58 and has a smaller diameter than the outer ring 58. The outer ring 58 includes an inner ring 59 for inserting and fixing the end of the drive shaft 51, a ball 60 for tilting and guiding the hub wheel 54 (or the drive shaft 51), and a retainer 61 for the ball.
[0005]
Further, a seal boot 62 for sealing the open portion of the outer ring 58 is provided. The seal boot 62 is attached so that one end portion covers the open portion of the outer ring 58 and the other end portion is the drive shaft 51. The end portions are attached to the outer ring 58 and the drive shaft 51 with an appropriate fastening force by a band.
[0006]
The double-row rolling bearing 57 has a single outer ring 63 having two rows of raceway grooves, and includes a plurality of balls 64 and two crown-shaped cages 65 as rolling elements arranged in two rows, The two inner rings that are essentially necessary are configured such that one uses the outer peripheral surface of the outer ring 58 of the second constant velocity joint 56 as the raceway surface and the other uses the outer peripheral surface of the hub wheel 54.
[0007]
In the middle of the outer peripheral surface of the outer ring 63 of the double row rolling bearing 57, a radially outward B flange 68 is formed which is bolted to a knuckle 66 fixed to the vehicle body side, and is formed at the center of the knuckle 66. An insertion hole 69 is formed through which the axle device 50 is inserted when assembled from the outer side.
[0008]
By the way, considering the load resistance, it is desirable that the capacity of the second constant velocity joint 56 is large. Therefore, in the axle device 50 of FIG. 3, the capacity of the second constant velocity joint 56 is made as large as possible in this way, so that the second constant velocity joint 56 has a diameter larger than the diameter of the outer ring 63 of the double row rolling bearing 57. The diameter of the outer ring 58, that is, the maximum diameter of the seal boot 62 is larger.
[0009]
[Problems to be solved by the invention]
The axle device 50 is a double row rolling bearing in which a first constant velocity joint 52 is inserted through an insertion hole 69 formed at the center of the knuckle 66, a drive shaft 51 is inserted, and a seal boot 62 is inserted through the insertion hole 69. The flange 68 of the 57 is brought into contact with the knuckle 66. Thereafter, the hub unit 56 is moved in the radial direction B of the insertion hole 69, the mounting holes formed in the knuckle 66 and the flange 68 are aligned with each other, and both are fixed to these mounting holes through the bolts 68, whereby the axle device 50 is fixed. Assemble to the car body.
[0010]
Since the axle device 50, particularly the hub unit 56 is fixed to the knuckle 66 in this way, the diameter of the insertion hole 69 of the knuckle 66 must be equal to or larger than the maximum diameter of the seal boot 62. However, the diameter of the outer ring 63 of the double row rolling bearing 57 is generally smaller than the maximum diameter of the seal boot 62. Therefore, when the hub unit 56 is inserted into the insertion hole 69 until the flange 68 is brought into contact with the knuckle 66 as described above, the outer ring 63 of the double row rolling bearing 57 and the insertion hole 69 of the knuckle 66 as shown in FIG. A considerable gap 70 is generated between the two. Then, in a state where such a gap 70 is generated, the hub unit 56 is moved in the radial direction B as described above to align the mounting holes formed in the knuckle 66 and the flange 68, and the bolts 68 are passed through the mounting holes. The task of fixing both sides was difficult.
[0011]
Then, this invention aims at provision of the hub unit for vehicles which can solve the said subject.
[0012]
[Means for Solving the Problems]
A hub unit for a vehicle according to claim 1 of the present invention has a first mounting flange attached to a support member fixed to a vehicle body on an outer peripheral surface, and a double-row outer ring raceway on an inner peripheral surface, respectively. The outer ring to be attached to the formed insertion hole, the second mounting flange to which the wheel is attached to the outer circumferential surface, and the first inner ring raceway facing the outer ring raceway in the portion near one end of the double row outer ring raceways, The first inner ring member provided, the second inner ring raceway facing the outer ring raceway near the other end of the double row outer ring raceways on the outer peripheral surface, and the bowl-shaped portion of the constant velocity joint on the inner peripheral surface, A bellows-shaped seal boot for protecting a constant velocity joint, comprising a second inner ring member each having a plurality of rolling elements provided between each outer ring raceway and the first and second inner ring raceways. Was attached to the open side of the bowl A dual hub unit, the diameter of the inboard side of the first mounting flange of the outer ring is smaller than the maximum diameter of the seal boot, the outer peripheral surface of the outer ring, approximately equal magnitude to the diameter of the insertion hole of the support member And a fitting ring member fitted to the insertion hole in a state where the first mounting flange is in contact with the mounting surface of the support member, and the constant velocity joint is attached to the support member. Pass the first mounting flange against the mounting surface of the support member through the insertion hole formed in the entire axial direction and having a diameter larger than the maximum diameter of the seal boot from the vehicle outboard side to the vehicle inboard side. It is characterized in that it is fixed in a state in which it is left.
A vehicle hub unit according to claim 2 of the present invention is the vehicle hub unit according to claim 1 , wherein the fitting ring member is formed of a light alloy such as aluminum.
[0013]
In the above configuration, the outer peripheral surface of the outer ring of the double-row rolling bearing and the inner peripheral surface of the insertion hole of the support member, which are conventionally generated by attaching the fitting ring member so as to fit into the insertion hole of the support member. Since there is no gap between them, the work of adjusting the position of the vehicle hub unit in the radial direction when the outer ring of the double row rolling bearing is fixed to the support member can be omitted, and the attachment to the support member can be easily performed. To do.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, a vehicle hub unit 1 according to an embodiment of the present invention is provided in an axle device A on the drive wheel side of an automobile. The axle device A includes a drive shaft 22 and an inner side thereof. The first constant velocity joint 12 is connected to a differential device (not shown), and the vehicle hub unit 1 is connected to the outer side of the drive shaft 22.
[0015]
The vehicle hub unit 1 includes a hub wheel 2 to which a brake disc rotor 11 (to be described later) for mounting a wheel (not shown) is fixed, and a shaft portion 4 (rotation) that is integrally inserted into an insertion hole 3 formed in the hub wheel 2. A second constant velocity joint 5 having a shaft) formed on the outer side, and a double row rolling bearing 6 for rotatably supporting the hub wheel 2 and the second constant velocity joint 5 about the axis C. Yes.
[0016]
A male spline that is spline-fitted to the female spline of the hub wheel 2 is formed on the outer peripheral surface of the shaft portion 4, and the shaft portion 4 is caulked against the recess 2 a of the hub wheel 2 so as to be integrated with the hub wheel 2. To prevent movement in the direction of the axis C.
[0017]
The hub wheel 2 is formed with a flange 7 projecting radially outward in the middle of the outer peripheral surface thereof, and the brake disc rotor 11 is fixed to the flange 7 via a hub bolt 7a. A wheel (not shown) is fixed. Reference numeral 13 in the figure denotes a brake pad for braking the rotation of the brake disc rotor 11.
[0018]
The second constant velocity joint 5 is a well-known member called a Rzeppa type (Burfield type), and has a bowl-shaped section 15 having a bowl-shaped cross section in which the shaft section 4 is integrally formed on one side, and the drive shaft 22. And the ball 10 and its retainer 20 for tilting and guiding the hub wheel 2 with respect to the drive shaft 22. The end of the drive shaft 22 is spline-fitted to the inner ring 17, and the drive shaft 22 is fixed to the inner ring 17 by a retaining ring (not shown).
[0019]
In addition, a seal boot 21 for protecting the second constant velocity joint 5 is attached from one open side of the bowl-shaped portion 15 to the middle of the drive shaft 22. The seal boot 21 includes a bellows-like boot body 31, An outer side end portion fitted on the bowl-shaped portion 15 and an outer end portion fitted on the drive shaft 22 are provided, and the outer side end portion of the seal boot 21 is secured by a band 25 with an appropriate fastening force. The other end portion of the seal boot 21 is similarly attached to the drive shaft 22 with a proper fastening force by another band 26.
[0020]
The double row rolling bearing 6 includes a single outer ring 16 having two rows of raceway grooves, a plurality of balls 9 as rolling elements arranged in two rows, and two crown-shaped cages 23, The two inner rings that are essentially required are configured such that one uses the outer peripheral surface of the bowl-shaped portion 15 as the raceway surface and the other uses the outer peripheral surface of the hub wheel 2.
[0021]
An annular contact-type seal member 32 is provided for sealing a gap between the outer side of the outer ring 16 of the double row rolling bearing 6 and the outer peripheral surface of the hub wheel 2, and the inner side of the outer ring 16 of the double row rolling bearing 6 is provided. And a sealing device 35 for sealing a gap between the outer peripheral surface of the bowl-shaped portion 15, and as shown in FIG. 2, the sealing device 35 includes a contact-type seal member 36 and a non-contact-type seal member 37. It is configured.
[0022]
A radially outward flange 8 that is bolted to a knuckle (an example of a support member) 24 that is fixed to the vehicle body is formed in the middle of the outer peripheral surface of the outer ring 16. Are formed with mounting holes 28a and 28b for inserting the bolts 27 therethrough.
[0023]
An insertion hole 29 for inserting the axle device A from the outer side is formed at the center of the knuckle 24, and the diameter of the insertion hole 29 is the maximum diameter d1 of the second constant velocity joint 5 (in this case, “band 25”). (Diameter). A fitting ring member (also referred to as a “collar”) 30 formed on the inner side of the flange 8 of the outer ring 16 and having an outer diameter d2 substantially equal to the diameter of the insertion hole 29 of the knuckle 24 is formed on the inner side base of the flange 8. It is fitted at the abutting position. The fitting ring member 30 is made of a light alloy such as aluminum.
[0024]
In the vehicle hub unit 1 configured as described above, the rotational power of the drive shaft 22 is transmitted to the second constant velocity joint 5 and the hub wheel 2, and is transmitted to the brake disc rotor 11 and the wheel. Rotate.
[0025]
Here, the procedure for assembling the axle device A to the vehicle body will be described. First, the axle device A is assembled, and the first constant velocity joint 12 is inserted into the insertion hole 29 of the knuckle 24 that is fixed to the vehicle body in advance. The axle device A is moved to the inner side, the seal boot 21 portion of the vehicle hub unit 1 is passed, and the vehicle hub unit 1 is moved to a position indicated by a solid line in FIG. 2, for example. At this time, since the diameter of the insertion hole 29 is formed larger than the maximum diameter d1 of the second constant velocity joint 5, the seal boot 21 portion can be easily passed through the insertion hole 29.
[0026]
Thereafter, the axle device A is further moved toward the inner side. At this time, the position of the axle device A is adjusted in the radial direction so that the fitting ring member 30 matches the position of the insertion hole 29. In this manner, the axle device A is moved to the inner side, and the fitting ring member 30 is fitted into the insertion hole 29 as indicated by the phantom line in FIG. Then, the mounting surface of the flange 8 comes into contact with the side surface of the knuckle 24. In this state, the bolt 27 is inserted into the mounting holes 28 a and 28 b to fix the flange 8 to the knuckle 24.
[0027]
Since the outer diameter d2 of the fitting ring member 30 is formed to be substantially equal to the diameter of the insertion hole 29 of the knuckle 24, when the bolt 27 is inserted into the mounting holes 28a and 28b, the axle device A is radially connected as in the conventional case. Therefore, the adjustment of moving the axle device A to the vehicle body becomes unnecessary, and the work of attaching the axle device A to the vehicle body becomes easy.
[0028]
Such an operational effect is the same as when the capacity of the second constant velocity joint 5 is increased in consideration of load resistance. That is, considering the load resistance, it is better that the capacity of the second constant velocity joint 5 is large. In this case, the diameter of the insertion hole 29 of the knuckle 24 is also large according to the maximum diameter d1 of the second constant velocity joint 5. When the axle device A is inserted until the flange 8 comes into contact with the side surface of the knuckle 24, it is between the outer peripheral surface of the outer ring 16 of the double row rolling bearing 6 and the inner peripheral surface of the insertion hole 29 of the knuckle 24. A large gap is generated. By fitting the fitting ring member 30 fitted in this gap into the outer ring 16 of the double row rolling bearing 6, the axle device A can be easily mounted on the vehicle body in the same manner as described above. Can be installed against.
[0029]
As described above, according to the embodiment of the present invention, the insertion hole 29 of the knuckle 24 is formed in the outer ring 16 of the double row rolling bearing 6 that rotatably supports the second constant velocity joint 5 and the hub wheel 2 around the axis C. Since the fitting ring member 30 to be fitted to the inner circumferential surface of the outer ring 16 is fitted, there is no gap between the outer circumferential surface of the outer ring 16 and the inner circumferential surface of the insertion hole 29. The flange 8 can be fixed to the knuckle 24 by inserting the bolts 27 into the mounting holes 28a and 28b without adjusting the position of the axle device A in the radial direction.
[0030]
【The invention's effect】
As is apparent from the above description, the present invention provides an outer ring of a double row rolling bearing that inserts a constant velocity joint through an insertion hole formed in a support member fixed to the vehicle body side and rotatably supports the constant velocity joint. In the vehicle hub unit fixed to the support member, the outer ring of the double row rolling bearing is formed on the outer ring of the double row rolling bearing with an outer diameter substantially equal to the diameter of the insertion hole of the support member. Since the fitting ring member that fits into the insertion hole is attached in a state of being in contact with the mounting surface of the support member, the fitting ring member is attached so as to fit into the insertion hole of the support member. Since there is no gap between the outer peripheral surface of the outer ring of the double row rolling bearing and the inner peripheral surface of the insertion hole of the support member, which occurs in the past, when fixing the outer ring of the double row rolling bearing to the support member, In the radial direction of the hub unit for the vehicle You can omit the operation such that the position adjustment can be easily attached to the support member.
[Brief description of the drawings]
FIG. 1 is an overall cross-sectional view of a vehicle hub unit showing an embodiment of the present invention.
FIG. 2 is an enlarged cross-sectional view of the main part of the same.
FIG. 3 is an overall cross-sectional view of a conventional vehicle hub unit.
FIG. 4 is a partially enlarged sectional view of the same.
[Explanation of symbols]
1 Vehicle Hub Unit 4 Shaft 5 Second Constant Velocity Joint 6 Double Row Rolling Bearing 7 Flange 8 Flange 11 Brake Disc Rotor 12 First Constant Velocity Joint 15 Ridge 16 Outer Ring 21 Seal Boot 22 Drive Shaft 24 Knuckle 25 Band 29 Insertion hole 30 Fitting ring member d1 Maximum diameter d2 of second constant velocity joint Outer diameter of fitting ring member A Axle device C Axle

Claims (2)

A first mounting flange attached to a support member fixed to the vehicle body on the outer peripheral surface, a double-row outer ring raceway on the inner peripheral surface, and an outer ring attached to an insertion hole formed in the support member;
A first inner ring member provided with a second mounting flange to which a wheel is mounted on the outer peripheral surface, and a first inner ring raceway facing the outer ring raceway at a portion near one end of the double row outer ring raceways,
A second inner ring member having a second inner ring raceway facing the outer ring raceway in the portion near the other end of the double row outer ring raceways on the outer peripheral surface, and a saddle-shaped portion of a constant velocity joint on the inner peripheral surface;
A plurality of rolling elements provided between each outer ring raceway and the first and second inner ring raceways,
A vehicle hub unit in which a bellows-shaped seal boot for protecting the constant velocity joint is attached to the open side of the bowl-shaped portion,
The diameter on the inboard side than the first mounting flange of the outer ring is smaller than the maximum diameter of the seal boot,
The outer ring is formed on the outer peripheral surface of the outer ring with an outer diameter approximately equal to the diameter of the support member insertion hole, and is fitted in the insertion hole with the first mounting flange in contact with the mounting surface of the support member. A mating ring member is attached,
The constant velocity joint is passed from the vehicle outboard side to the vehicle inboard side through an insertion hole formed in the support member and having a larger diameter than the maximum diameter of the seal boot in the entire axial direction , and the first mounting flange is supported by the support member. A hub unit for a vehicle, wherein the vehicle hub unit is fixed in a state of being in contact with the mounting surface. The vehicle hub unit according to claim 1, wherein the fitting ring member is formed of a light alloy such as aluminum.

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