JPH0562861U - Vehicle speed sensor device - Google Patents

Abstract

(57) [Abstract] [Purpose] When the hub 5 is assembled to the axle 1, the pickup 9a of the sensor 9 attached to the axle 1 interferes with the sensor rotor 8 having an uneven outer periphery attached to the hub 5. Try to get a difficult vehicle speed sensor device. [Structure] The outer circumference of the sensor rotor 8 is a conical surface having a small diameter on the sensor 9 side and the surface of which is uneven, and the side surface of the pickup 9a of the sensor 9 facing this is an inclined surface parallel to the conical surface of the sensor rotor 8. To do.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The vehicle speed sensor device of the present invention can be used to electrically detect the speed of the vehicle and operate the anti-skid mechanism of the brake.

[0002]

[Prior Art]

 FIG. 4 is a vertical cross-sectional view showing a state in which a conventional vehicle speed sensor device is incorporated in a drum brake of a driven wheel, and FIG. 5 is a partial vertical cross-sectional view showing an unfavorable state that tends to occur when a hub is attached to an axle. ..

Next, the conventional structure will be described. Reference numeral 1 denotes an axle fixed to a vehicle body, to which a backing plate 2 of a drum break is fixed. The brake shoe 3, a wheel cylinder 4 for driving the brake shoe 3, and other drum brake mechanisms are attached to the backing plate 2. Reference numeral 5 is a hub for mounting wheels, which is rotatably mounted on the axle 1 via a separable tapered roller bearing 6. A brake drum 7 and a sensor rotor 8 are connected to the hub 5. The sensor rotor 8 has a gear-shaped concavo-convex formed on the outer periphery of a cylinder, and the pickup 9a of the sensor 9 closely faces and opposes the outer periphery. The sensor 9 is attached to the axle 1 by a bracket 10. The distance between the pickup 9a and the peripheral surface of the sensor rotor 8 is about 1 mm.

When the vehicle travels and the hub 5 rotates, the sensor rotor 8 rotates with it, and the unevenness on the outer circumference of the rotor 8 alternately passes through the position of the pickup 9a that does not rotate. Since an electric pulse corresponding to the vehicle speed is generated, the rotational speed of the rotor 8 and thus the magnitude of the vehicle speed can be taken out from the sensor 9 as an electric signal, and the antiskid device can be operated corresponding to the vehicle speed based on this signal. it can.

[0005]

[Problems to be solved by the device]

 To assemble the hub 5 and the brake drum 7 to the axle 1, push the hub 5 and the brake drum 7 which are separated from the axle 1 in the tapered roller bearing 6 into the axle 1 to which the sensor 9 is attached in advance. Connect the roller bearings 6 and assemble the parts as shown in FIG.

At the time of this assembling work, it must be done with care so that the sensor rotor 8 and the sensor pickup 9a do not collide, but the gap between the rotor 8 and the pickup 9a is as small as about 1 mm as described above. Therefore, as shown in FIG. 5, for example, the lower part (upper and lower parts according to the drawing) of the separated tapered roller bearing 6 comes into contact first, and the hub 5 and the drum 7 rotate counterclockwise with this lower part as a fulcrum. In the case where the sensor rotor 8 is to be assembled by the above, the sensor rotor 8 collides with the pickup 9a. When the sensor rotor 8 and the pickup 9a interfere with each other in this way, the pickup is damaged.

[0007]

[Means for solving the problem]

 In this invention, the outer circumference of the rotor facing the pickup 9a is a conical surface with a small diameter on the sensor side, and the side surface of the pickup 9a facing the conical surface is an inclined surface parallel to the generatrix of the conical surface of the rotor. This is to avoid interference between the rotor and the pickup.

[0008]

[Action]

 Since the side surface of the pickup 9a facing the sensor rotor 8 is an inclined surface parallel to the generatrix of the conical surface of the outer circumference of the rotor 8, the gap between the outer circumference of the rotor and the pick-up side surface at the time of assembly becomes larger than before. Therefore, the risk of interference between the two during assembly is significantly reduced.

[0009]

【Example】

 FIG. 1 is a vertical sectional view of a drum brake device showing a state in which a vehicle speed sensor device according to the present invention is incorporated, and FIG. 2 is a partial vertical sectional view showing a state of a gap between a hub 5 and a pickup 9 at the end of assembly. FIG. 4 is a partial vertical sectional view showing the state of this gap during assembly.

Portions equivalent to those in FIG. 4 and FIG. 5 are designated by the same reference numerals, and the description thereof will be omitted.

The outer periphery of the sensor rotor 8 is a conical surface with a small diameter on the sensor 9 side and unevenness on the surface, and the side surface of the pickup 9 a of the sensor 9 facing the sensor rotor 8 is a conical surface of the sensor rotor 8. Parallel to the generatrix of the vehicle, that is, an inclined surface that opens toward the end of the axle 1.

Therefore, as shown in FIG. 2, when the rotor 8 is in the a position apart from the pickup 9a during the assembly, the gap m between the two is the state of FIG. 3 in which the rotor 8 is in the b position after the assembly is completed. Since it is much larger than the gap n between them, even if the sensor rotor 8 and the pickup 9a move in the same manner as in FIG. 5 during assembly, the risk of interference between them is reduced.

[0013]

[Effect of the device]

 The outer circumference of the sensor rotor and the side surface of the pickup are opposed to each other by a tapered surface that opens toward the axle end so that the gap between the two is widened during assembly work. Therefore, when the hub 5 is assembled to the axle 1, the sensor rotor The risk of pick-up damage due to interference between the sensor pickup and the sensor pickup is reduced, and assembly work is significantly facilitated.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an embodiment of a vehicle speed sensor device of the present invention.

FIG. 2 is a partial vertical cross-sectional view showing a gap between a sensor rotor and a pickup during assembly thereof.

FIG. 3 is a partial vertical cross-sectional view showing a gap between a sensor rotor and a pickup at the end of assembly.

FIG. 4 is a vertical cross-sectional view illustrating a conventional vehicle speed sensor device.

FIG. 5 is a partial vertical cross-sectional view showing an unfavorable state at the time of assembling this.

[Explanation of symbols]

 1 Axle 2 Backing Plate 3 Brake Shoe 4 Wheel Cylinder 5 Hub 6 Tapered Roller Bearing 7 Brake Drum 8 Sensor Rotor 9 Sensor 9a Pickup 10 Bracket

Claims (1)

[Scope of utility model registration request] 1. An axle (1) having a vehicle speed sensor (9) attached thereto.
In a vehicle speed sensor device in which a hub (5) to which a brake drum (7) and a sensor rotor (8) are attached is coupled via a separable taper roller bearing (6), the outer circumference of the sensor rotor (8) is connected to a sensor ( A sensor (9) facing the conical surface with a conical surface with a small diameter on the side of 9)
The vehicle speed sensor device, wherein the side surface of the pickup (9a) is an inclined surface parallel to the generatrix of the conical surface on the outer circumference of the rotor.