JP2600995Y2 - Bearing unit for semi-floating axle with rotation speed detection sensor - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION A bearing unit for a semi-floating axle with a rotation speed detecting sensor according to the present invention rotatably supports a rear axle of a commercial vehicle or a small truck, and controls the rotation speed of the axle. Use to detect.

[0002]

2. Description of the Related Art A rear axle, FF in a normal FR vehicle (front engine / rear wheel drive vehicle) when the drive wheels are non-independently suspended.
The rear axle in the case of a car (front engine / front wheel drive vehicle) where the non-drive wheels are non-independently suspended, or the front axle in the case of special vehicles such as forklifts and shovel loaders, Rolling bearings such as ball bearings, tapered roller bearings, and cylindrical roller bearings are rotatably supported inside the axle tube supported via a spring.

For example, the structure shown in FIG. 7 is a conventional structure of a portion for rotatably supporting a rear axle of an FR vehicle with respect to an axle tube as disclosed in Japanese Patent Application Laid-Open No. 1-288619. Is shown. The axle tube 1 supported on the lower surface of the vehicle via a leaf spring or the like has one end connected to a casing of a differential device (differential gear), and a bearing device provided at the other end opening.

[0004] An outer ring 4 constituting a ball bearing 3 is fitted in a cylindrical bearing housing 2 welded and fixed to an open end of the axle tube 1 and one end is connected to the differential device. The inner ring 6 that constitutes the ball bearing 3 is externally fitted to the axle 5 through which is inserted. Outer ring raceway 7 and inner ring 6 on inner peripheral surface of outer ring 4
A plurality of balls 9, 9 are mounted between the outer peripheral surface and the inner raceway 8 so that the axle 5 can rotate freely inside the axle tube 1.

Further, a backing plate (right end face in FIG. 7) is provided on the other end face (right end face in FIG. 7) of the outer ring 4 where one end face (left end face in FIG. 7) abuts against a step portion 10 formed on the inner peripheral face of the bearing housing 2. The holding cover 12 is abutted through a member 11 serving as a substrate of a drum brake), and the holding cover 12 and the bearing housing 2 are connected to each other by bolts 13 and nuts 14.
The outer ring 4 is prevented from falling off the bearing housing 2. On the other hand, the other end surface (the left end surface in FIG. 7) of the inner ring 6 whose one end surface (the right end surface in FIG. 7) abuts against the step portion 15 formed on the outer peripheral surface of the end portion of the axle 5 Fixed ring 1
The inner ring 6 is positioned by abutting the end face of the inner ring 6.

The semi-floating axle bearing is constructed as described above, but is rotatably supported by such a bearing to control an antilock brake system (ABS) or a traction control system (TCS). Conventionally, when detecting the rotation speed of the axle 5, the configuration is as shown in FIG.

In FIG. 8, reference numeral 17 denotes a tone wheel having a gear-shaped unevenness formed on the outer peripheral surface thereof. The tone wheel 17 is fitted on the axle 5 and held between the inner ring 6 and the fixing ring 16. It rotates with this axle 5. Also, bearing housing 2
A mounting hole 18 is formed at a position facing the outer peripheral surface of the tone wheel 17. Then, a sensor 19 is inserted into the mounting hole 18 from the outside of the bearing housing 2, and the tip of the sensor 19 faces the outer peripheral surface of the tone wheel 17. The sensor 19
The support arm 20 is fixed to the outer peripheral surface of the bearing housing 2 based on a screw engagement between the stud 21 and the nut 22.

When the tone wheel 17 fixed to the axle 5 rotates as the vehicle travels, the tone wheel 1
The distance between the outer peripheral surface of the sensor 7 and the tip of the sensor 19 changes, and the output of the sensor 19 changes. Since the frequency of this change is proportional to the rotation speed of the axle 5, if the output signal of the sensor 19 is input to a controller (not shown), ABS or TC
S can be controlled.

[0009]

[Problems to be solved by the invention] The bearing unit for a semi-floating axle with a rotation speed detection sensor according to the invention achieves efficient parts management and assembly work by reducing the number of parts.
It is intended to reduce manufacturing costs.

In the case of the conventional structure shown in FIG. 8, the number of constituent parts is large, the parts management and the assembling work are complicated, and the production cost is increased. In particular, the inner end portion of the bearing housing 2 (except in the case of pointing in the diametrical direction, the inner portion refers to a portion closer to the center in the width direction of the vehicle, and the left side of FIG. 8 is the same throughout the specification) and the outer end of the axle tube 1 are joined by welding, so that the assembling work of this joint is troublesome.

[0011] As shown in FIG.
Not only is attached to the bearing housing 2 using the mounting flange 23, but also the flanges provided at the outer end of the axle tube 1 and the inner end of the bearing housing 2 are connected to each other, so that the bearing housing 2 is connected. If the joining operation of the axle tube 1 and the axle tube 1 is performed, the assembling operation of the above-mentioned joint can be facilitated, but the following new problem occurs.

That is, the bearing housing 2 is preferably formed by forging a metal material from the viewpoints of strength retention and processing cost. However, in the case of forming a shape having flanges at both ends of a cylindrical portion by forging. A special and difficult processing method such as a closing method had to be adopted, and the production cost was unavoidable.

Only one flange is provided on the outer peripheral surface of the bearing housing 2, a flange at the outer end of the axle tube 1 is provided on the inner surface of the flange, and an inner surface near the inner periphery of the backing plate 11 is provided on the outer surface. It is also conceivable that the axle tube 1 or the backing plate 11 and the sensor 1
9 to prevent interference with any one of the members 1 and 11
In addition, it is not practical because it is necessary to form a notch or the like to avoid the sensor 19.

The bearing unit for a semi-floating axle with a rotation speed detecting sensor according to the present invention has been devised in view of the above-mentioned circumstances.

[0015]

The bearing unit for a semi-floating axle with a rotation speed detecting sensor according to the present invention, which is described in claim 1, comprises an outer ring formed by forging a metal material, A first mounting flange integrally formed on an outer peripheral surface of the outer ring for joining the outer ring to an outer end portion of the axle tube; and a backing formed around the outer ring integrally formed on an outer peripheral surface of the outer ring. A second mounting flange for supporting the plate, an outer raceway formed on the inner peripheral surface of the outer race,
Inside the outer race, an inner race supported concentrically with the outer race, an inner race formed on a portion of the outer peripheral surface of the inner race facing the outer race, and rolling between the inner race and the outer race. A plurality of rolling elements movably provided, a tone wheel fixed to a position off the inner ring track on the outer peripheral surface of the inner ring, and a part of the outer ring facing the outer peripheral surface of the tone wheel. A mounting hole formed at a position, and a sensor fixed to the outer ring while being inserted into the mounting hole from the outside of the outer ring, the tip of which is opposed to the outer peripheral surface of the tone wheel.

A plurality of the first mounting flanges and a plurality of the second mounting flanges are provided intermittently in the circumferential direction and out of phase with each other. Further, the first mounting flange is provided at a position closer to the axle tube than the second mounting flange.
Further, both circumferential ends of each of the first mounting flanges and circumferential ends of each of the second mounting flanges are connected by continuous walls provided integrally with the outer race.

The mounting position of the sensor is such that the first mounting flange circumferentially adjacent to the first mounting flange is located in the circumferential direction.
Second mounting flank adjacent to each other or circumferentially
It is located between the two flanges, and is located between the inner surface of the first mounting flange and the outer surface of the second mounting flange in the axial direction.

On the other hand, a semi-floating axle bearing unit with a rotation speed detection sensor according to a second aspect of the present invention has an outer ring formed by forging a metal material and an outer ring formed integrally with the outer ring. a mounting flange to match the inner surface of the inner peripheral portion near the backing plate on the outer surface with matching a receiving flange of the axle tube outer end to the side, the
An outer raceway formed on the inner peripheral surface of the outer race at a position axially deviated from the mounting flange; an inner race supported concentrically with the outer race inside the outer race; and an outer periphery of the inner race. An inner raceway formed in a portion facing the outer raceway in a plane, a plurality of rolling elements provided rotatably between the inner raceway and the outer raceway, and an outer peripheral surface of the inner race,
Form the mounting flange in the axial direction from the inner ring raceway.
A tone wheel fixed at a position off the side where the
A mounting hole formed at a position facing the outer peripheral surface of the tone wheel in a part of the outer ring, and fixed to the outer ring while being inserted into the mounting hole from the outside of the outer ring; And a sensor opposed to the outer peripheral surface of the sensor.

The mounting flanges are provided intermittently in the circumferential direction. Further, the mounting position of the sensor may be any two adjacent in the circumferential direction.
The position is between the mounting flanges, and in the axial direction, between the inner side surface and the outer side surface of each mounting flange.

[0020]

In the case of the bearing unit for a semi-floating axle with a rotation speed detection sensor according to the present invention configured as described above,
The operation of connecting the outer ring to the outer end of the axle tube can be performed by screwing and connecting the flanges. Further, the operation of supporting the backing plate around the outer ring can be performed by screwing the backing plate to the flange. Since all operations can be performed only by simple screwing operations, the assembling operation is not troublesome.

In either case, the outer race can be made by ordinary forging. Therefore, the manufacturing cost of the bearing housing does not increase.

[0022]

1 to 3 show a first embodiment of the present invention. The outer peripheral surface of the outer race 24 has first mounting flanges 25 and 25 and second mounting flanges 26 and 2
6 are integrally formed with the outer ring 24 by forging. These first mounting flanges 25, 25
A plurality (four in the illustrated example) of the second mounting flanges 26 and 26 are provided intermittently in the circumferential direction and out of phase with each other.

The first mounting flanges 25, 25 are provided closer to the axle tube 1 (see FIGS. 7 and 8) to which the outer ring 24 is to be connected than the second mounting flanges 26, 26. I have. Further, each of the first mounting flanges 25, 25
And the two circumferential edges of the second mounting flanges 26, 26 are connected by continuous walls 27, 27 provided integrally with the outer race 24, respectively. That is,
On the outer peripheral surface of the outer ring 24, a corrugated wall is formed, in which the first and second mounting flanges 25 and 26 and the continuous walls 27 and 27 are alternately and continuously formed.

The first and second mounting flanges 25, 26
Of the first mounting flanges 25, 25,
The outer surface of a receiving flange (not shown) fixed to the outer end opening of the axle tube 1 is abutted against 25a, and both flanges are joined. On the other hand, the inner faces of the backing plate 11 (see FIGS. 7 and 8) near the inner periphery are abutted against the second mounting flanges 26, 26, and this backing plate 1
1 is screwed and fixed to the second flanges 26, 26.

The outer raceway 7 is provided on the inner peripheral surface of the outer race 24.
An inner raceway 8 is formed on the outer peripheral surface of an inner race 28 supported concentrically with the outer race 24 inside the outer race 24, and both raceways 7, 8 are opposed to each other. A plurality of balls 9 and 9 are provided between 7 and 8 so as to freely roll.

At a position outside the inner raceway 8 on the outer peripheral surface of the inner race 28, a magnetic metal plate is bent into a U-shape in cross section, and a tone wheel 29 entirely formed in an annular shape is externally fitted and fixed. . On the other hand, a part of the outer ring 24 facing the outer peripheral surface of the tone wheel 29 is provided with a mounting hole 1.
8 are formed.

However, the position where the mounting hole 18 is formed is
In the circumferential direction (horizontal direction in FIG. 2), it is adjacent in the circumferential direction.
The position between the first mounting flanges 25, 25 to be engaged with each other or
A position between the second mounting flanges 26 adjacent to each other in the circumferential direction, a position sandwiched between the adjacent continuous walls 27, 27, and extending in the axial direction (vertical direction in FIG. 2). The position is between the inner surfaces 25a, 25a of the first mounting flanges 25, 25 and the outer surfaces 26a, 26a of the second mounting flange.

The sensor 19 is inserted into the mounting hole 18.
Is inserted from the outside of the outer ring 24, and a support arm 30 fixedly mounted on the side of the intermediate portion of the sensor 19 is fixed to an outer peripheral surface of the outer ring 24 by a screw 31. In this state, the tip of the sensor 19 faces the outer peripheral surface of the tone wheel 29 via a minute gap (for example, 0.5 to 1 mm or less).

The outer peripheral surface of the end of the inner race 28 and the outer race 24
A seal member 32 is provided between the inner peripheral surface of the axle 1 and the seal member 32 to allow the differential oil existing in the axle tube 1 to enter the portion where the sensor 19 and the balls 9 and 9 are provided. We are trying to prevent it. Further, on the outer peripheral surface of the inner end of the outer ring 24, the first mounting flange 25,
On the outer peripheral surface of the portion protruding from 25, a locking groove 33 is formed over the entire circumference. An O-ring 34 is fitted in the locking groove 33. When the outer ring 24 and the axle tube 1 are joined together, the outer peripheral edge of the O-ring 34 abuts on the inner peripheral surface of the axle tube 1 to seal the joint between the two members 24 and 1 to form an axle. It prevents foreign substances such as dust and water from entering the pipe 1 and leakage of differential oil inside the axle pipe 1.

When the axle 5 (see FIGS. 7 and 8) is rotatably supported by the semi-floating axle bearing unit with the rotation speed detection sensor of the present invention configured as described above, the first mounting flange is used. The outer ring 24 is fixed to the end of the axle tube 1 by abutting the flanges 25 and 25 with the receiving flange formed at the outer end opening of the axle tube 1 and joining the two flanges with bolts. At the same time, the end of the axle 5 is fitted inside the inner race 28.

In this manner, the outer ring 24 is fixed to the outer end of the axle tube 1 and the outer ring 24 is attached to the backing plate 11.
When the sensor 19 is supported, since the installation position of the sensor 19 is regulated as described above, even if the axle tube 1 and the backing plate 11 are not provided with cutouts, the axle tube 1 and the backing There is no interference between the plate 11 and the sensor 19.

As the vehicle travels, the inner ring 2 together with the axle 5
8 rotates, the tone wheel 29 externally fitted and fixed to the outer peripheral surface of the inner ring 28 rotates.
Of the sensor 19 and the tip of the sensor 19 change. As a result, the output of the sensor 19 changes at a frequency proportional to the rotation speed of the axle 5.

In particular, in the case of the bearing unit for a semi-floating axle with a rotation speed detection sensor of the present invention, the outer ring 24 having the first and second mounting flanges 25 and 26 integrally formed on the outer peripheral surface is formed by ordinary forging. I can make it. That is, when the outer ring 24 with the flange of the present invention having a shape as shown in FIGS. 1 to 3 is formed by forging, the mold is moved in the axial direction (the front and back direction in FIG.
(The vertical direction of FIG. 3, the horizontal direction of FIG. 3), the processing operation can be easily performed. Therefore, the production cost of the outer ring 24 does not increase.

When the first and second flanges 25 and 26 are formed intermittently and out of phase with each other as shown in FIG. 4, forging dies can be accurately aligned in the circumferential direction. In addition to the necessity of matching, the molds rub against each other at the time of processing, and the durability of the mold deteriorates. Therefore, the outer ring 2
4 cannot be sufficiently reduced.

FIGS. 5 and 6 show a second embodiment according to the present invention. A plurality of (four in the illustrated example) thick mounting flanges 35 are intermittently formed on the outer peripheral surface of the intermediate portion of the outer ring 24. Each of these mounting
The formation positions of the flanges 35 in the axial direction are outside
A position deviating from the outer raceway 7 formed on the inner peripheral surface of the wheel 24;
doing. A mounting hole 18 is formed in a part of the outer ring 24 between adjacent mounting flanges 35, 35, and a sensor 19 is inserted into the mounting hole 18. Mounting hole 18
The sensor 19 is located between the inner side surface 35a and the outer side surface 35b of the mounting flanges 35, 35 in a state where the sensor 19 is inserted.

In this embodiment, as in the case of the first embodiment, the outer ring 24 integrally formed with the mounting flanges 35 can be formed by ordinary forging. Other configurations and operations are the same as those of the first embodiment described above, and therefore, the same reference numerals are given to the same parts, and the duplicate description will be omitted.

[0037]

[Effects of the Invention] The bearing unit for a semi-floating axle with a rotational speed detection sensor according to the present invention is configured and operates as described above, so as the number of parts is reduced, parts management and simplification of assembly work are achieved. The cost can be reduced by facilitating the production of parts.

[Brief description of the drawings]

FIG. 1 is a front view showing a first embodiment of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is a front view showing an undesired shape of the outer ring with a mounting flange.

FIG. 5 is a front view showing a second embodiment of the present invention.

6 is a sectional view taken along line BB of FIG.

FIG. 7 is a sectional view showing a bearing device for a conventional semi-floating axle.

FIG. 8 is a cross-sectional view showing a state in which a rotation speed detection sensor is incorporated in a bearing device of a conventional semi-floating axle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Axle tube 2 Bearing housing 3 Ball bearing 4 Outer ring 5 Axle 6 Inner ring 7 Outer ring raceway 8 Inner ring raceway 9 Ball 10 Stepped portion 11 Backing plate 12 Holding lid 13 Bolt 14 Nut 15 Stepped portion 16 Fixing ring 17 Tone wheel 18 Mounting hole 19 Sensor Reference Signs List 20 support arm 21 stud 22 nut 23 mounting flange 24 outer ring 25 first mounting flange 25a inner side surface 26 second mounting flange 26a outer side surface 27 continuous wall 28 inner ring 29 tone wheel 30 support arm 31 screw 32 seal member 33 locking recess Groove 34 O-ring 35 Mounting flange 35a Inner surface 35b Outer surface

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G01P 3/00-3/80 G01D 5/00-5/252 F16C 19/06

Claims (2)

(57) [Scope of request for utility model registration] An outer ring made by forging a metal material, and a first mounting flange integrally formed on an outer peripheral surface of the outer ring for joining the outer ring to an outer end of an axle tube. A second mounting flange integrally formed on an outer peripheral surface of the outer ring, for supporting a backing plate around the outer ring, an outer ring raceway formed on an inner peripheral surface of the outer ring, and an inner side of the outer ring. An inner race supported concentrically with the outer race, an inner race formed on a portion of the outer periphery of the inner race facing the outer race, and a rotatably mounted race between the inner race and the outer race. A plurality of rolling elements, a tone wheel fixed on the outer peripheral surface of the inner ring at a position deviating from the inner ring raceway, and a part of the outer ring formed at a position facing the outer peripheral surface of the tone wheel. Mounting holes,
A sensor fixed to the outer ring in a state of being inserted into the mounting hole from outside the outer ring, a sensor having a tip end thereof opposed to an outer peripheral surface of the tone wheel, the first mounting flange and the second mounting A plurality of flanges are provided intermittently in the circumferential direction and in a state of being out of phase with each other. The first mounting flange is closer to the axle tube than the second mounting flange. Are provided at a position, and the circumferential both ends of each of the first mounting flanges and the circumferential both ends of each of the second mounting flanges are continuous with a continuous wall provided integrally with the outer ring, respectively. The mounting position of the sensor is, in the circumferential direction,
Between the first mounting flanges that are circumferentially adjacent
Is a position between the second mounting flanges adjacent in the circumferential direction, and is a position between the inner surface of the first mounting flange and the outer surface of the second mounting flange in the axial direction. Bearing unit for semi-floating axle with speed detection sensor. 2. An outer ring made by forging a metal material, and an outer ring formed integrally with the outer peripheral surface of the outer ring. A mounting flange that abuts the inner surface of the part near the inner circumference, and a shaft
In the position deviated in the direction, the outer ring raceway formed on the inner peripheral surface of the outer ring, the inner ring supported concentrically with the outer ring inside the outer ring, and the outer ring raceway on the outer peripheral surface of the inner ring. An inner ring raceway formed at the opposing portion; a plurality of rolling elements provided rotatably between the inner raceway and the outer raceway; and an outer peripheral surface of the inner race, in an axial direction from the inner raceway.
With respect to the tone wheel fixed to a position off the side where the mounting flange is formed, a mounting hole formed at a position facing a peripheral surface of the tone wheel in a part of the outer ring, A sensor fixed to the outer ring in a state of being inserted into the mounting hole, and a sensor having a distal end portion facing the outer peripheral surface of the tone wheel, wherein the mounting flanges are provided intermittently in the circumferential direction. The sensor is mounted at a position between any two adjacent mounting flanges in the circumferential direction, and between an inner surface and an outer surface of each mounting flange in the axial direction. Bearing unit for a semi-floating axle with a rotational speed detection sensor.