JP2600996Y2 - Bearing unit for semi-floating axle with rotation speed detector - Google Patents

Description

[Detailed description of the invention]

[0001]

A bearing unit for a semi-floating axle with a rotation speed detecting device according to the present invention rotatably supports an axle of a rear wheel such as a commercial vehicle or a small truck, and has a rotational speed of the axle. Used 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) and the non-driven wheels are non-independent suspension, or the front axle in the case of special vehicles such as forklifts and shovel loaders, Roller bearings such as ball bearings, tapered roller bearings, and cylindrical roller bearings rotatably support the inside of the axle tube supported via a spring. For example, the structure shown in FIG.
Japanese Patent Application Laid-Open No. 1-288819 discloses a conventional structure of a portion for rotatably supporting a rear axle of an FR vehicle with respect to an axle tube.
No. 1 is described in Japanese Unexamined Patent Publication (Kokai) No. H10-26095. The axle tube 1 supported on the lower surface of the floor of the vehicle via a leaf spring or the like has one end connected to a casing of a differential gear (differential gear), and a bearing device provided at the other end opening.

[0003] 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. Between the outer raceway 7 formed on the inner peripheral surface of the outer race 4 and the inner raceway 8 formed on the outer peripheral surface of the inner race 6,
A plurality of balls 9, 9 are mounted so that the axle 5 can rotate freely inside the axle tube 1. Further, a stepped portion 10 having one end face (the left end face in FIG. 5) formed on the inner peripheral face of the bearing housing 2.
A backing plate (a member serving as a substrate for a drum brake) is provided on the other end surface (the right end surface in FIG. 5) of the outer ring 4 abutted against
The holding lid 12 is abutted via 11 or the like. And
The holding lid 12 and the bearing housing 2 are connected to the bolt 1
The outer ring 4 is prevented from falling off from the bearing housing 2 by being connected by the nut 3 and the nut 14. On the other hand, the other end surface (the left end surface in FIG. 5) of the inner ring 6 having one end surface (the right end surface in FIG. 5) abutted against the step portion 15 formed on the outer peripheral surface of the end portion of the axle 5, is fitted to the axle 5 outside. The inner ring 6 is positioned by abutting the end face of the fixed ring 16.

The bearing device for a semi-floating axle is constructed as described above, but is rotatably supported by such a bearing device in order to control an antilock brake system (ABS) and a traction control system (TCS). In the case of detecting the rotation speed of the axle 5, conventionally, for example, it has been configured as shown in FIG. The tone wheel 17 shown in FIG.
Has a gear-shaped unevenness on the outer peripheral surface, and is fitted on the axle 5 and rotates together with the axle 5 while being sandwiched between the inner ring 6 and the fixed ring 16. Also, bearing housing 2
A mounting hole 18 is formed at a position facing a peripheral surface of the tone wheel 17 at a part of the hole. 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 signal of the sensor 19 changes. Since the frequency of this change is proportional to the rotation speed of the axle 5, the sensor 1
9 is input to a controller (not shown), ABS
And TCS.

FIG. 7 shows a second example of a conventional bearing unit for a semi-floating axle with a rotational speed detecting device. The structure shown in FIG. 7 is designed to increase the outer diameter of the tone wheel in order to increase the output voltage of the sensor 19. That is, as one of means for increasing the output voltage of the sensor 19 during the rotation of the axle 5 to improve the accuracy of detecting the rotational speed of the axle 5, the peripheral speed of the tone wheel (the tone facing the sensor 19) is used. It has been considered to increase the displacement speed of the outer peripheral surface of the wheel). Therefore, in the case of the conventional structure shown in FIG. 7, a thick and cylindrical retainer 23 is externally fixed to the axle 5, and a tone wheel 24 is externally fixed to the outer peripheral surface of the retainer 23. The tone wheel 24 is entirely made of a magnetic material. By forming a large number of through holes 25 at equal intervals in the circumferential direction, the magnetic characteristics in the circumferential direction are alternately changed. ing.

In the case of the structure shown in FIG. 7, by providing the retainer 23, the outer diameter of the tone wheel 24 is made sufficiently larger than the outer diameter of the axle 5 to increase the peripheral speed of the tone wheel 24. Then, the output voltage of the sensor 19 is increased.

[0008]

In the case of the conventional structure shown in FIG. 7, when the outer diameter of the tone wheel 24 is increased, the volume of the retainer 23 increases and the weight of the rotation speed detector increases. Get out. Of course, even if the outer diameter of the tone wheel 17 is increased in the structure shown in FIG. 6, the weight of the tone wheel 17 increases. The bearing unit for a semi-floating axle with a rotation speed detecting device according to the present invention has been devised in consideration of the above-described circumstances to reduce the weight while securing the output voltage of the sensor.

[0009]

The bearing unit for a semi-floating axle with a rotational speed detecting device according to the present invention is arranged to support wheels, one end of which is a ball bearing, and the other end of which is another bearing. It is rotatably supported and is coupled to the axle tube to support one end of the axle inserted inside the axle tube containing oil therein. Such a bearing unit of the present invention is provided with a flange for coupling and fixing to the axle tube on its outer peripheral surface, a single outer raceway on its inner peripheral surface, and a mounting hole near the outer raceway. By inserting the outer ring and the sensor mounted on the outer ring by passing through the mounting hole, a single inner ring track is provided on the outer peripheral surface, and an inner ring having a cylindrical inner peripheral surface through which the axle is inserted inside. A tone wheel fixed to the outer peripheral surface of the inner ring, a short-row deep-groove type ball bearing constituted by the outer raceway, the inner raceway, and a plurality of balls provided between the two raceways; In order to prevent oil from entering the ball bearing side, a seal member is provided for closing between the outer ring and the inner ring. The tone wheel includes an element having an L-shaped cross section and includes a cylindrical portion to be measured concentrically with the inner ring, and a magnetic characteristic of an outer peripheral surface of the portion to be measured extends in a circumferential direction. It changes at equal intervals. Further, the sealing material is connected to the tone wheel.

[0010]

The semi-floating axle bearing unit with the rotational speed detecting device of the present invention configured as described above has the same function as that of detecting the rotational speed of the wheel via the axle itself, as described above. Same as in the case. In particular, in the case of the bearing unit for a semi-floating axle with a rotation speed detecting device of the present invention, since the tone wheel is configured to include an element having an L-shaped cross section, the outer diameter of the portion to be measured is increased. It is possible to reduce the weight of the tone wheel while sufficiently securing the output signal of the sensor. Further, since the bonded shea Lumpur material tone wheel, to reduce the axial length of the bearing unit, downsizing of the bearing unit.

[0011]

FIG. 1 shows a first embodiment of the present invention.
A mounting flange 27 is formed on the outer peripheral surface of the outer race 26 integrally with the outer race 26 by forging. The mounting flange 27 includes a plurality of outer mounting portions 28 provided intermittently in the circumferential direction, and a plurality of inner mounting edges intermittently provided in the circumferential direction. By connecting both ends of the mounting portion 29 in the circumferential direction to each other by the connecting portion 30, a shape extending in the circumferential direction is formed into a waveform. The inner mounting portion 29 and the receiving flange 31 formed at the outer end (the right end in FIG. 1) of the axle tube 1 are joined and fixed by bolts 32, and the outer ring 26 is fixed to the axle tube 1. It is fixed to the outer end opening. On the other hand, the outer mounting portion 28
, The backing plate 11 is fixed by bolts 33.

The rotational speed detecting sensor 19 is screwed and fixed to the outer ring 26 at a portion closer to the inside than the outer mounting portion 28 and at a portion sandwiched between the adjacent connecting portions 30. Note that a part of the sensor 19 does not project inward from the inner side surface of the inner mounting portion 29. Therefore, the sensor 19 does not interfere with the outer surface of the receiving flange 31.

On the other hand, an axle 5 inserted inside the axle tube 1
The inner ring 34 is fitted over the end of the
5 and the fixing ring 16 are clamped and fixed. A plurality of balls 9, 9 are provided between an inner raceway 8 formed on the outer peripheral surface of the inner race 34 and an outer raceway 7 formed on the inner peripheral surface of the outer race 26. The axle 5 can rotate freely. A tone wheel 36 is externally fitted and fixed to the inner end (left end in FIG. 1) of the inner race 34 at a position deviated from the inner raceway 8 so that the tone wheel 36 rotates together with the axle 5. I have to. The tone wheel 36 has a generally U-shaped cross section by fitting two elements 37a and 37b together.

Each of the elements 37a and 37b is formed in an annular shape having an L-shaped cross section. The element 37a on the inner side in the diametrical direction has a cylindrical support portion 38 which can be externally fixed to the inner ring 34. The inner edge (the left edge in FIG. 1) of the support portion 38 is bent outward at a right angle in the diametrical direction to form an outward flange portion 39. The element 37b on the outer side in the diameter direction is
A measurement section 40 having a cylindrical shape concentric with the support section 38;
The inner edge (the left edge in FIG. 1) of the measured portion 40 is bent at a right angle inward in the diametrical direction to form an inward flange portion 41.

The inner diameter of the inward flange portion 41 in the free state is the same as or slightly smaller than the outer diameter of the support portion 38. Then, the two elements 37a,
In the combination of the elements 37a and 37b, the inner peripheral edge of the inward flange portion 41 is externally fitted to the support portion 38 of the element 37a, and the inward flange portion 41 and the outward flange portion 39 are abutted. Combine. Further, in such a combined state, the inward, outward, and both flange portions 41 and 39 are bonded to each other with a sealing material 42 described later, and the support portion 38 and the measured portion 40 are connected to each other. The connecting portion 43 has a ring shape.

The measured part 40 has a large number of through holes 25.
Are formed at equal intervals in the circumferential direction, so that the magnetic characteristics of the outer peripheral surface of the measured portion 40 are alternately changed in the circumferential direction. Then, a detection unit provided at the inner end of the sensor 19 is opposed to the outer peripheral surface of the measured unit 40 via a minute (for example, about 0.5 mm) gap.

Further, a rubber seal member 42 is attached to the connecting portion 43 of the tone wheel 36 configured as described above. The sealing member 42 is formed of the two elements 37.
In a state in which a and 37b are inserted into a mold, rubber is injected into the mold. Part of the rubber injected into the molding die also enters the gap between the two flanges 39 and 41, and bonds the two flanges 39 and 41 to each other. The outer peripheral edge of such a sealing material 42 is in sliding contact with the inner peripheral surface of the outer ring 26 in a state where the tone wheel 36 is externally fixed to the inner ring 34. Then, the differential oil that has entered the axle tube 1 from the differential case is prevented from reaching the tone wheel 36 and the balls 9 and 9.

With the bearing unit for a semi-floating axle with a rotational speed detecting device of the present invention configured as described above, the axle 5
Is rotatably supported, and when the inner ring 34 rotates together with the axle 5 as the vehicle travels, the tone wheel 36 externally fitted and fixed to the outer peripheral surface of the inner ring 34 rotates. Then, a large number of through holes 25 formed in the measured portion 40 constituting the outer peripheral surface of the tone wheel 36 pass immediately before the detecting portion at the inner end of the sensor 19 supported by the outer ring 26. As a result, the distance between the detection section and the magnetic material forming the measured section 40 changes, and the output signal 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 detecting device of the present invention, the tone wheel 36 is formed by bending a metal plate, and the support portion 38, the connecting portion 43, and the measured portion 40 are formed. In order to constitute the U-shaped cross section, the outer diameter of the portion to be measured 40 is increased,
The weight of the tone wheel 36 can be reduced while sufficiently securing the output signal of the sensor 19 facing the outer peripheral surface of the measured section 40.

Further, as in the illustrated embodiment, by attaching the seal member 42 to the tone wheel 36, the axial length of the entire bearing unit can be reduced, and the size of the bearing unit can be reduced. That is, in the case of the conventional structure shown in FIG. 7, the seal ring 44 for preventing the differential oil from entering the installation portion of the tone wheel 24 and the balls 9, 9 is provided independently of the tone wheel 24. Therefore, the axial length dimension of the entire bearing unit has been increased. On the other hand, in the case of the embodiment shown in FIG. 1, since the seal material 42 is provided on the tone wheel 36, it is not necessary to secure a space for installing the seal ring 44, and the axial length of the bearing unit is reduced. By reducing the size, the size of the bearing unit can be reduced.

Each of the elements 37a and 37b constituting the tone wheel 36 is made of a metal material suitable for each use. For example, the element 37a having the support portion 38 can be as thin as possible (for example, 0.
The material is not particularly limited. On the other hand, the measured part 4
The element 37b having 0 has a thickness (for example, 1.5 mm or more) necessary to sufficiently secure the output signal of the sensor 19 described above.
Made of a magnetic material having

FIG. 2 shows a second embodiment of the present invention. In the first embodiment described above, the inner peripheral edge of the inward flange portion 41 is externally fitted to the outer peripheral surface of the support portion 38. In the case of the present embodiment, the outer peripheral edge of the outward flange portion 39 is covered. It is fitted inside the inner peripheral surface of the measuring section 40. Other configurations and operations are the same as those of the above-described second embodiment.

In order to manufacture a lightweight tone wheel having a U-shaped cross section, one magnetic metal plate may be bent as shown in FIG. 3A. However, when a tone wheel having a shape as shown in FIG. 1A is manufactured, the following problems are encountered as compared with a case where two elements 37a and 37b are combined as shown in FIGS. Have. That is, in order to prevent the measured portion 40 from being deformed at the time of bending, the operation of punching and forming a large number of through holes 25 in the measured portion 40 must be performed after bending. However,
When forming by punching after bending, the measured portion 40
In the gap 45 between the inner peripheral surface of the
A die for punching must be inserted. Since the thickness T of the gap 45 is not always large, the strength of the receiving mold may be insufficient.

As shown in FIG. 3B, the measured part 40
If the tip end of the tone wheel protrudes from the supporting portion 38 and the large number of through holes 25 are formed in the projecting portion, the strength of the receiving die can be sufficiently secured, but the axial length of the tone wheel is longer than necessary. Would be longer. 3A and 3B, the metal material constituting the support portion 38 and the portion 4 to be measured are not limited.
The metal material constituting 0 cannot be changed according to the purpose. However, any of the structures shown in FIGS. 3A and 3B can reduce the weight of the bearing unit.

FIG. 4 shows a third embodiment of the present invention. In the case of this embodiment, the outward flange 39 and the inward flange 41
And the supporting portion 38
The cross-sectional shape of the tone wheel 46 is formed in a crank shape by providing the to-be-measured part 40 and the to-be-measured part 40 in mutually opposite directions.
A small through hole is formed at a position where the outward flange portion 39 and the inward flange portion 41 are aligned with each other.
41 are connected to each other by the sealing material 42 that has entered each small through hole.
Linked to each other.

On the other hand, a seal ring 47 is fixedly fitted around the element 37a on the inner peripheral surface of the outer ring 26. Then, the edge of the sealing material 42 supported by the element 37a is attached to the core metal 48 of the seal ring 47, and the sealing material 4 supported by the core metal 48.
9 is slid in contact with the element 37a to prevent the differential oil from entering the measured portion 40 and the installation portions of the balls 9 and 9. Other configurations and operations are the same as those in the first embodiment.
The positional relationship between the outward flange portion 39 and the inward flange portion 41 may be reversed with the positional relationship between the support portion 38 and the measurement target portion 40 kept unchanged.

[0027]

[Effects of the Invention] The bearing unit for a semi-floating axle with a rotation speed detecting device according to the present invention is constructed and operates as described above. Therefore, it is possible to suppress the axial dimension while sufficiently securing the output voltage of the sensor. Thereby, the size and weight can be reduced.

[Brief description of the drawings]

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

FIG. 2 is a sectional view of a tone wheel showing the second embodiment.

FIG. 3 is a sectional view showing another two examples of the tone wheel.

FIG. 4 is a sectional view showing a third embodiment of the present invention.

FIG. 5 is a sectional view showing a conventional bearing device for a semi-floating axle.

FIG. 6 is a sectional view showing a first example of a state in which a rotation speed detection sensor is incorporated in a conventional bearing device for a semi-floating axle.

FIG. 7 is a sectional view showing the second example.

[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 retainer 24 tone wheel 25 through hole 26 outer ring 27 mounting flange 28 outer mounting portion 29 inner mounting portion 30 connecting portion 31 receiving flange 32, 33 bolt 34 inner ring 35 stepped portion 36 tone wheel 37a, 37b element 38 Supporting part 39 Outward flange part 40 Measured part 41 Inward flange part 42 Seal material 43 Connecting part 44 Seal ring 45 Gap 46 Tone wheel 47 Seal ring 48 Core metal 49 Seal material

Claims (1)

(57) [Scope of request for utility model registration] An axle arranged to support wheels, one end of which is rotatably supported by a ball bearing and the other end of which is rotatably supported by another bearing, and which is inserted inside an axle tube containing oil therein. A bearing unit coupled to the axle tube for supporting one end of the outer ring, a flange for coupling and fixing to the axle tube on its outer peripheral surface, a single outer raceway on its inner peripheral surface, By attaching the mounting holes in the vicinity of the track to the outer rings provided respectively and the mounting holes, a sensor mounted on the outer ring and a single inner ring track on the outer peripheral surface are provided, and the axle is inserted inside the track. An inner ring having a cylindrical inner peripheral surface, and a tone wheel fixed to the outer peripheral surface of the inner ring,
In order to prevent oil in the axle tube from entering the ball bearing side, a short row deep groove ball bearing composed of the outer ring raceway, the inner ring raceway and a plurality of balls provided between these two raceways, A seal member for closing the gap between the outer ring and the inner ring, the tone wheel including an element having an L-shaped cross section, a cylindrical portion to be measured concentric with the inner ring, and a A bearing unit for a semi-floating axle with a rotation speed detecting device, wherein magnetic properties of an outer peripheral surface are changed at equal intervals in a circumferential direction, and the seal member is connected to the tone wheel.