JPH0769189A - Installation structure of sensor ring - Google Patents

Abstract

PURPOSE:To provide a structure for the easy manufacture and installation of a sensor ring which is used for detecting the speed of an automobile. CONSTITUTION:An axle shaft 15 is supported on an axle housing 13 through a bearing 19, and a ring-shaped retainer 20 for holding the bearing 19 is fitted on the axle shaft 15, and a sensor ring 9 is press-fitted into the retainer 20. Since the sensor ring 9 is constituted separatedly from the retainer 20, the sensor ring 9 can be formed from the nonstrengthened member different from the retainer 20, and the manufacture of the sensor ring 9 can be carried out more easily. Since the sensor ring 9 is constituted separatedly from the retainer 20, and the retainer 20 can be used in common independently of the existence of an antilock brake system, the general purpose use performance can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure for a sensor ring used in an antilock brake system (ABS) of an automobile.

[0002]

2. Description of the Related Art An anti-lock brake system (ABS) for an automobile is equipped with a vehicle speed sensor, and a brake lock can be prevented by controlling an actuator of a computer based on a detection signal of the vehicle speed sensor.

The vehicle speed sensor is generally provided on a rotating body such as a hub for wheel mounting or a drive shaft, and is provided with a magnetic sensor ring having a gear-shaped protrusion on its outer periphery and a slight distance from the outer periphery of this sensor ring. It is roughly composed of a sensor main body which is provided in a fixed portion on the vehicle body side in a space and has a magnet and a coil built therein. With this configuration, the magnetic flux emitted from the magnet is changed by the protrusion of the sensor ring, and a voltage of a frequency proportional to the rotation speed of the sensor ring, that is, the rotor is induced in the coil.Therefore, the rotation speed of the rotor is based on this voltage signal. That is, the vehicle speed is calculated.

An example of such a sensor ring mounting structure is shown in FIG. In the figure, reference numeral 1 denotes a knuckle spindle portion, which comprises a knuckle portion 2 and a spindle portion 3. A hub 5 is rotatably supported on the spindle portion 3 via a bearing 4. A brake drum 6 is attached to the hub 5 with bolts 7. The wheel hub of the wheel is attached to the bolt 7, but the illustration of that portion is omitted.

A sensor ring 9 having a tooth portion 8 at its tip is attached to the inner end of the hub 5 by fitting.
Further, a hole 10 is provided in the knuckle portion 2 facing the sensor ring 9, and a sensor body 11 is fitted into the hole 10 by fitting. This allows the hub 5
When is rotated, the sensor body 11 detects the tooth portion 8 of the sensor ring 9 that rotates integrally.

FIG. 5 shows another example of a mounting structure for the sensor ring 9. In this case, the sensor ring 9 is press-fitted onto the drive shaft 12.
A sensor main body 11 is attached to a hole 14 provided in the axle housing 13 by inserting the sensor main body 11 so that the detection portion at the tip end faces the sensor ring 9 side.

Another example of the mounting structure of the sensor ring 9 is shown in FIGS. 6 and 7. In this figure, numeral 15 is an axle shaft, which is connected to the output side of the differential device 16. The input shaft 17 of the differential device 16 is connected to a transmission (not shown). Reference numeral 18 denotes a connecting portion connected to the axle housing 12, and the axle shaft 15 is supported by the connecting portion 18 via a bearing 19. A ring-shaped retainer 20 holding a bearing 19 is fitted on the axle shaft 15. A sensor ring 9 is formed integrally with the retainer 20.

[0007]

In any of these structures, the sensor ring 9 and the sensor body 11 constitute a vehicle speed sensor. Then, the rotation speed of the wheel is detected by detecting the movement of the sensor ring 9 rotating with the wheel by the sensor main body 11.

By the way, in the mounting structure of the sensor ring 9 shown in FIG. 4 described above, it is necessary to process the hub 5 in order to mount the sensor ring 9 on the hub 5. Also,
Since the sensor ring 9 is exposed to the outside, it is necessary to take measures against rust and chipping.

Further, in the mounting structure of the sensor ring 9 shown in FIG. 5, in order to secure the minimum outer diameter dimension of the sensor ring 9 required to maintain a predetermined performance, the drive shaft 12 or the sensor ring 9 is provided. It was necessary to set itself thick.

Further, in the mounting structure of the sensor ring 9 shown in FIGS. 6 and 7, it is necessary to prepare two types of retainers 20 with and without the sensor ring 9 depending on the presence or absence of the anti-lock brake system. there were. Further, since the retainer 20 having high strength is subjected to the gear cutting process, there is a problem that the cost is increased accordingly.

The present invention has been made in view of the above circumstances, and provides a sensor ring mounting structure which can reduce the processing for mounting and enhance the versatility of a retainer and which can be easily manufactured. With the goal.

[0011]

In order to achieve the above object, the present invention has an axle shaft supported by an axle housing via a bearing, and a ring-shaped retainer for holding the bearing is fitted to the axle shaft. However, a sensor ring for a vehicle speed sensor is press-fitted to the retainer.

[0012]

With this structure, since the sensor ring is formed separately from the retainer, the sensor ring can be formed of a non-strength member unlike the retainer. Since the sensor ring is configured separately from the retainer, the retainer can be shared regardless of the presence or absence of the anti-lock brake system. Since the sensor ring is press-fitted into the retainer, it is not necessary to increase the outer dimensions of the axle shaft in order to secure the minimum required outer diameter of the sensor ring.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the figure, the hub 5 is attached to the axle shaft 15. The axle shaft 15 is supported by a connecting portion 18 connected to the axle housing 13 via a bearing 19. A ring-shaped retainer 20 holding a bearing 19 is fitted on the axle shaft 15. The sensor ring 9 is fitted into the retainer 20 by press fitting. In the connecting portion 18, the sensor body 11
Is inserted with the detector positioned on the sensor ring 9 side. 21 is an oil seal, the contact surface of which has been precision processed.

In this sensor ring 9 mounting structure, the sensor ring 9 formed separately from the retainer 20 is a retainer.
Unlike 20, it is not a strong member, so it can be easily manufactured by sintering. Since the sensor ring 9 is configured separately from the retainer 20, the retainer 20 can be used in common regardless of the presence or absence of the anti-lock brake system to enhance versatility, and the conventional examples shown in FIGS. 6 and 7 are available. You can improve the inconvenience.

Since the sensor ring 9 is press-fitted into the retainer 20, it is not necessary to increase the outer dimension of the axle shaft 15 in order to secure the required minimum outer diameter dimension of the sensor ring 9.

In this embodiment, since the contact surface of the oil seal 21 is precisely machined, the sensor ring 9 can be attached only by extending the machining allowance. This can be achieved without performing new positioning. Further, since the sensor ring 9 is fitted to the retainer 20 which is accurately positioned, vibration of the sensor ring 9 can be suppressed.

As another example of the conventional sensor ring mounting structure, there is a type in which a sensor ring is fitted to an axle housing (outer ring) as shown in Japanese Patent Laid-Open No. 64-28056. In the mounting structure shown in this publication, in order to fit the sensor ring on the axle housing, it is necessary to process the axle housing, and there is a problem similar to that shown in FIG. You will be able to solve the problem.

[0018]

Since the present invention is the structure for mounting the sensor ring of the vehicle speed sensor constructed as described above, the sensor ring is constructed separately from the retainer.
Unlike the retainer, the sensor ring can be formed of a non-strength member, which makes the sensor ring easier to manufacture. In addition, the sensor ring is configured separately from the retainer,
Since the retainer can be shared regardless of the presence or absence of the anti-lock brake system, versatility can be enhanced. The sensor ring is press-fitted into the retainer,
Since it is not necessary to increase the external dimensions of the axle shaft in order to secure the minimum required outer diameter of the sensor ring, new processing can be reduced by this amount.

[Brief description of drawings]

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

FIG. 2 is an exploded perspective view showing the same embodiment.

FIG. 3 is an exploded perspective view showing a retainer and a sensor ring of the same embodiment.

FIG. 4 is a sectional view showing a conventional example.

FIG. 5 is a cross-sectional view showing another conventional example.

FIG. 6 is a cross-sectional view showing still another conventional example.

FIG. 7 is a partially enlarged sectional view showing the conventional example.

[Explanation of symbols]

 9 Sensor ring 11 Sensor body 13 Axle housing 15 Axle shaft 18 Connecting part 19 Bearing 20 Retainer

Claims (1)

[Claims] 1. An axle shaft is supported by an axle housing via a bearing, a ring-shaped retainer for holding the bearing is fitted on the axle shaft, and a sensor ring for a vehicle speed sensor is press-fitted to the retainer. Sensor ring mounting structure characterized by