JPH0523136U - Wheel speed detector - Google Patents

Abstract

(57) [Abstract] [Purpose] To detect the wheel speed of a wheel mounted on a hub supported by a support member, a pulsar ring mounted on the hub having a large number of teeth in the circumferential direction, and the tooth. In a wheel speed detecting device having a sensor attached to the supporting member having a pickup facing the toothed portion, it is possible to fix the pulsar ring to the hub while avoiding adversely affecting the accuracy of the tooth portion. Solves the problems of the installation space and heat resistance, and reduces the processing man-hours. A step portion facing the one end in the axial direction is formed in an outer peripheral intermediate portion of a pulsar ring 25 having a press-fitting hole 26 for press-fitting the hub 1 and having a tooth portion 29 provided at one end in the axial direction. 30 is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention has a pulsar ring which has a plurality of teeth in the circumferential direction and is attached to the hub, and a pickup which faces the teeth to detect the wheel speed of a wheel attached to the hub supported by the support member. And a sensor attached to the support member having the following.

[0002]

[Prior Art]

 Conventionally, in such a device, a pulser ring having a tooth portion on the outer circumference or one end surface in the axial direction is coaxially attached to the hub, and a sensor is attached to a supporting member so as to face the tooth portion.

[0003]

[Problems to be solved by the device]

 However, when the teeth are provided on the outer circumference of the pulser ring, the sensor must be mounted on the support member on the outer side in the radial direction from the center of rotation of the hub, which causes a problem in terms of arrangement space. However, in the case of a wheel equipped with a drum brake, the sensor must be housed and arranged in the drum brake, which becomes relatively hot during use, and the sensor must have a heat-resistant structure. When a tooth portion is provided at one end of the pulsar ring in the axial direction, a screwing structure or a press-fitting structure can be considered as the structure for attaching the pulsar ring to the hub. When the screwed structure is used, the pulsar ring and the hub must be threaded, which increases the number of processing steps.When the press-fit structure is used, when the pulsar ring has a simple cylindrical shape, the teeth are not pressed. Of the tooth, which may result in damage to the teeth and reduced accuracy.

The present invention has been made in view of such circumstances, and it is possible to press fit the pulsar ring to the hub while avoiding adversely affecting the accuracy of the tooth portion, and to arrange the sensor space and It is an object of the present invention to provide a vehicle wheel speed detecting device which can solve the problem of heat resistance and reduce the number of processing steps.

[0005]

[Means for Solving the Problems]

 To achieve the above object, according to a first aspect of the present invention, an outer periphery of a pulser ring is formed in a cylindrical shape having a press-fitting hole for press-fitting a hub and provided with a tooth portion at one axial end thereof. The portion is provided with a step portion facing the one end side in the axial direction.

According to a second aspect of the present invention, in addition to the structure of the first aspect, the back plate of the drum brake is provided on the support member in the circumferential direction around the pulser ring. It is attached by bolts at a plurality of positions, and notches are provided in the step portion at positions corresponding to those bolts.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

1 to 4 show a first embodiment of the present invention. FIG. 1 is a vertical sectional view, FIG. 2 is an enlarged sectional view taken along line 2-2 of FIG. 1, and FIG. 3 is a sectional view of FIG. -3 line enlarged sectional view, FIG. 4 is a 4-4 line enlarged sectional view of FIG.

First, in FIG. 1, a wheel W is attached to a hub 1 by a plurality of, for example, four bolts 5 and nuts 6, and the hub 1 is rotated by a wheel support 7 as a support member suspended on a vehicle body (not shown). Freely supported. A drum brake B is attached to the wheel W.

The wheel support 7 includes a support main body 8 having a spindle hole 8a, and a flange 9 projecting outward from an outer end (left end in FIG. 1) along the axial direction of the spindle hole 8a. The spindle 10 is press-fitted into the spindle hole 8a so as to project axially outward from the wheel support 7. On the other hand, the hub 1 includes a cylindrical portion 1a that coaxially surrounds the protruding portion of the spindle 10, and a flange portion 1b that extends radially outward from the outer end portion of the cylindrical portion 1a, Between the protruding portion of the spindle 10 and the hub 1, an angular bearing 12a having a cylindrical portion 1a as an outer ring and a cylindrical member fitted to the protruding portion of the spindle 10 as an inner ring 11a, and a cylindrical portion 1a are provided. An angular bearing 12b, which is an outer ring and is fitted to the protruding portion of the spindle 10 and has a cylindrical member as an inner ring 11b, is provided so that the inner rings 11a and 11b abut each other. Thus, the inner rings 11a, 11b of the angular bearings 12a, 12b are sandwiched between the axially outer end of the support main body 8 of the wheel support 7 and the nut 13 screwed to the protruding end of the spindle 10. .. Moreover, in the angular bearing 12a, the dust seal 14 is interposed between the cylindrical portion 1a as the outer ring and the inner ring 11a on the inner end side thereof, and the bottomed double cylindrical receiving member for slidingly contacting the lip portion 14a of the dust seal 14 24 is press-fitted and fixed to the inner end of the support main body 8 of the wheel support 7, and a dust seal 15 is interposed between the cylindrical portion 1a and the inner ring 11b on the outer end side of the angular bearing 12b.

The drum brake B includes a wheel W and a wheel-shaped brake drum 16 that is coupled to the flange portion 1 b of the hub 1 by a plurality of bolts 4 and nuts 5 and the open end of the brake drum 16 is closed. A back plate 17 connected to the flange 9 of the support 7, a pair of brake shoes 18 arranged so as to be capable of sliding contact with the inner surface of the brake drum 16, and a back plate 17 for exerting hydraulic pressure for operating both brake shoes 18. It is a conventionally well-known one having a wheel cylinder 19 and the like attached to the.

Referring also to FIG. 2, the back plate 17 has a plurality of insertion holes 20 provided in the back plate 17 at a plurality of, for example, four places circumferentially spaced around the cylindrical portion 1 a of the hub 1. The inserted bolt 21 is attached to the wheel support 7 by screwing it into a screw hole 22 provided in the flange 9 of the wheel support 7. Further, the flange portion 1b of the hub 1 is provided with insertion holes 23 for inserting a tool (not shown) for tightening the bolt 21 and for checking the torque, in a number corresponding to the bolt 21 and a mutual interval. ..

Referring to FIGS. 3 and 4 together, a pulsar ring 25 is press-fitted and fixed to the axially inner end portion of the cylindrical portion 1 a of the hub 1. The pulsar ring 25 includes a cylindrical portion 27 having a press-fitting hole 26 into which the inner end of the cylindrical portion 1a of the hub 1 is press-fitted, and a restricting flange portion 28 that extends radially inward from the inner end of the cylindrical portion 27. A large number of tooth portions 29 are provided on the outer surface of the regulating collar portion 28 at equal intervals in the circumferential direction. The pulsar ring 25 is fixed to the hub 1 by press-fitting the cylindrical portion 1a into the press-fitting hole 26 until the restricting flange portion 28 comes into contact with the inner end of the cylindrical portion 1a of the hub 1. In order to abut a tool (not shown) for exerting a pressing force on the pulsar ring 25 for fixing, the step portion 30 facing one end in the axial direction, that is, the inner end side, is formed at a right angle in the axial direction at the outer peripheral intermediate portion of the cylindrical portion 27. Is provided. Moreover, the step portion 30 is notched by the notch 31 at a position corresponding to a plurality of, for example, four bolts 21 for attaching the back plate 17 of the drum brake B to the flange 9 of the wheel support 7.

On the other hand, the flange 9 of the wheel support 7 is provided with a raised portion 9a connected to the support main body portion 8. The raised portion 9a has a pickup 32a facing the tooth portion 29 of the pulsar ring 25. A sensor 32 is attached. That is, the raised portion 9a is provided with a mounting hole 33, and the sensor 32 is inserted into the mounting hole 33 so that the flange 34 provided at the rear portion of the sensor 32 abuts on the raised portion 9a. Are fixed to the raised portion 9a with a pair of mounting bolts 35.

Next, the operation of this embodiment will be described. The pulsar ring 25 has a tooth portion 29 at its inner end in the axial direction and is fixed to the hub 1, and the sensor 32 is a spindle 10. Since the sensor 32 can be attached to the wheel support 7 at a position close to the center of the sensor, the sensor 32 can be arranged in a compact space, and the sensor 32 is housed and arranged in the drum brake B, which has a relatively high temperature. By avoiding this, it is not necessary to provide the sensor 32 with a heat resistant structure.

Moreover, since the pulsar ring 25 is press-fitted and fixed to the hub 1, it is possible to reduce the number of processing steps by eliminating the screw processing.

Further, since the step portion 30 perpendicular to the axial direction is provided on the outer periphery of the pulsar ring 25, the step portion 30 can be pressed during the above-described press-fitting and fixing operations, and one end of the pulsar ring 25 can be pressed. It is possible to prevent the tool from hitting the provided tooth portion 29 and perform the press-fitting operation to prevent the accuracy and damage of the tooth portion 29 from being reduced.

Further, since the notch 31 corresponding to the plurality of bolts 21 for fixing the back plate 17 is provided in the step portion 30, a tool for tightening each bolt 21 and checking the torque is provided. A space for inserting from the insertion hole 23 and engaging with the bolt 21 can be secured between the pulsar ring 25 and the pulsar ring 25. The engagement operation of each bolt 21 can be enabled.

Further, in the pulsar ring 25, since the tooth portion 29 is provided on the outer surface of the restricting brim portion 28 that extends radially inward from the inner end of the cylindrical portion 27, the outer diameter of the cylindrical portion 1 a of the hub 1 can be changed. Also, it is not necessary to change the diameter of the tooth portion 29 and the mounting position of the sensor 32.

FIG. 5 shows a second embodiment of the present invention, in which parts corresponding to those of the first embodiment are designated by the same reference numerals.

A first annular groove 36 coaxial with the shindle 10 is provided at a portion of the wheel support 7 that faces the tram brake B of the flange 9, and the spindle 10 is provided on the radially inner side of the first annular groove 36. A second annular groove 37 coaxial with is provided. On the other hand, the pulsar ring 25 'having the stepped portion 30' with the notch 31 'interposed between the outer periphery thereof has the tooth portion 29' at one axial end thereof projected into the first annular groove 36. It is press-fitted and fixed to the cylindrical portion 1 a of the hub 1. Thus, the sensor 32 'fixed to the raised portion 9a of the flange 9 of the wheel support 7 has its pickup 32a' opposed to the tooth portion 29 'in the first annular groove 36, and the raised portion 9a. It is inserted into the mounting hole 33 of.

Further, the lip portion 14 a of the dust seal 14 interposed between the cylindrical portion 1 a as an outer ring and the inner ring 11 a on the axial inner end side of the angular bearing 12 a is slidably contacted with the inner surface of the second annular groove 37. Be done.

According to the second embodiment, the pulsar ring 25 ′ and the first annular groove 36 form a labyrinth structure, so that the infiltration of water into the dust seal 14 side can be suppressed, and at the same time, as shown in FIGS. The receiving member 24 in the first embodiment shown in FIG. 4 is unnecessary, which can contribute to the reduction of the number of parts.

In the above embodiments, the device for detecting the wheel speed of the driven wheels has been described, but the present invention can be implemented in connection with the driving wheels.

[0025]

[Effect of the device]

 As described above, according to the first feature of the present invention, the pulsar ring has a press-fitting hole into which the hub is press-fitted and is formed in a cylindrical shape. Since the step portion facing the one end side in the axial direction is provided, it is possible to reduce the processing man-hours associated with the fixed structure of the pulsar ring and prevent the accuracy and damage of the tooth portion from being reduced.

According to a second aspect of the present invention, in addition to the configuration of the first aspect, the back plate of the drum brake is provided on the support member in the circumferential direction around the pulser ring. Since the bolts are attached at a plurality of positions and the notches are provided at the positions corresponding to the bolts, the engaging operation of the bolts in a narrow space becomes possible.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a first embodiment.

2 is a sectional view taken along line 2-2 of FIG.

3 is an enlarged sectional view taken along line 3-3 of FIG.

4 is an enlarged cross-sectional view taken along line 4-4 of FIG.

FIG. 5 is a sectional view of a second embodiment corresponding to FIG.

[Explanation of symbols]

 1 Hub 7 Wheel Support as Supporting Member 17 Back Plate 21 Bolt 25, 25 'Pulsar Ring 26 Press-fitting Hole 29, 29' Teeth 30, 30 'Step 31, 31' Notch 32, 32 'Sensor 32a, 32a' Pickup B Drum brake W Wheel

Claims (2)

[Scope of utility model registration request] 1. A large number of tooth portions (29, 29 ') in the circumferential direction for detecting the wheel speed of a wheel (W) mounted on a hub (1) rotatably supported by a support member (7). A pulsar ring (25, which is attached to the hub (1)
25 ') and a wheel speed detection including a pickup (32a, 32a') facing the teeth (29, 29 ') and a sensor (32, 32') attached to the support member (7). In the device, a pulsar ring (25, 25 ') is formed in a cylindrical shape having a press-fitting hole (26) into which the hub (1) is press-fitted and tooth portions (29, 29') are provided at one axial end. The wheel speed detecting device, wherein a step portion (30, 30 ') facing the one end in the axial direction is provided in the outer peripheral intermediate portion. 2. A back plate (17) of the drum brake (B) is provided on the support member (7) at a plurality of positions at circumferentially spaced intervals around the pulsar ring (25, 25 '). 21. Wheel according to claim 1, characterized in that it is mounted by means of means (21) and the step (30, 30 ') is provided with a notch (31, 31') at a position corresponding to these bolts (21). Speed detection device.