JPH04137901U - Wheel rotation speed detection device for running vehicles - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent dirt from entering the rotation speed detection section. [Structure] A cover 11 is attached to the axle 1 facing the outer peripheral surface of the wheel hub 3a, and a pulse wheel 7 and a rotation speed detection sensor 8 are connected to the outer peripheral surface of the wheel hub 3 and the cover 11 in correspondence with each other to detect the rotation speed. A seal 14 is installed between the cover 11 and the outer peripheral surface of the pulse wheel 7 on the outside of the rotation speed detection section to prevent earth and sand from entering the rotation speed detection section.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a device for detecting the wheel rotation speed of a traveling vehicle.

0002

[Conventional technology]

As shown in Fig. 1, the front wheels of a running vehicle are connected to an axle 1 via a bearing 2. A hub 3 is rotatably supported, and a tire 4 is attached to this wheel hub 3 to form a wheel 5. However, it is known that the wheels 5 are rotatable around the axle 1. In such a front wheel, a brake mechanism 6 is provided between the axle 1 and the wheel hub 3. is installed so that the front wheels can be braked, and this brake mechanism 6 is controlled. Therefore, the rotation speed of the wheels 5 is detected. For example, as shown in FIG. 2, a pulse wheel 7 is attached to the outer peripheral surface of the wheel hub 3. Attach the rotation speed detection sensor 8 to the axle 1, and as the wheel 5 rotates, the pulse ho When the wheel 7 rotates, the rotation speed detection sensor 8 outputs a signal proportional to the rotation speed. I try to do that.

0003

[Problem that the idea aims to solve]

Such a rotation speed detection device has a pulse wheel 7 and a rotation speed detection sensor 8 facing each other. Since the rotation speed detection part is exposed to the outside, the If the concave part formed or the tip of the rotation speed detection sensor 8, that is, the rotation speed detection part, is damaged by dirt, sand, etc. Durability is poor as it may be worn out or damaged.

0004 Therefore, the present invention has been developed to detect the wheel rotation speed of a running vehicle, which can solve the above-mentioned problems. The purpose is to provide an output device.

[0005]

[Means to solve the problem]

A ring-shaped cover 11 is attached to the axle 1 facing the outer peripheral surface of the wheel hub 3, The pulse wheel 7 is attached to the outer peripheral surface of the wheel hub 3 and the cover 11 for detecting the rotation speed. The sensors 8 are installed facing each other to form a rotation speed detection section, and the A seal 14 is installed between the inner peripheral surface of the cover 11 and the outer peripheral surface of the wheel hub 3. Something. A flange 22 is attached to a retainer 20 of a bearing 2 that supports a wheel hub 3 on an axle 1. Provided to face the outer peripheral surface of the wheel hub 3, and connect the outer peripheral surface of the wheel hub 3 and the flange. 22, the pulse wheel 7 and the rotation speed detection sensor 8 are installed facing each other to measure the rotation speed. The inner circumferential surface of the flange 22 and the wheel on the outside of the rotation speed detection part are used as a detection part. A seal 27 is installed between the hub 3 and the outer peripheral surface.

[0006]

[Effect]

The seal can prevent dirt, etc. from entering the rotation speed detection section.

[0007]

【Example】

As shown in Fig. 3, a ring is attached to the brake mounting plate 10 attached to the axle 1. A shaped cover 11 is attached, a rotation speed detection sensor 8 is attached to this cover 11, and the A concave portion is formed on one side 12 of the outer circumferential surface of the loose wheel 7, and the other side 13 of the outer circumferential surface is formed into a planar shape. The tip 8a of the rotation speed detection sensor 8 is opposed to one side 12 of the outer peripheral surface. There is a cylinder between the other side 13 of the outer circumferential surface and the inner circumferential surface of the cover 11. Install the rotation speed detection section 14 to isolate the rotation speed detection section from the outside and prevent dirt, etc. from reaching the rotation speed detection section. Avoid getting into it. The seal 14 may be an oil seal or a floating seal. The pulse wheel 7 may be integrated with the wheel hub 3. As shown in FIG. 4, the inner layer of the bearing 2 that supports the wheel hub 3 on the axle 1 A seal receiver 21 and a flange 22 are integrally provided on the retainer 20 that supports the base 2a. , an O-ring is installed between the inner circumferential recess 3a of the wheel hub 3 and the inner circumferential recess 21a of the seal receiver 21. Attach the rings 23 respectively and press the pair of seal rings 24, 24 to make the float float. A rotational speed detection sensor 8 is attached to the flange 22, and the A tooth portion 26 having a tip portion 8a formed on the outer circumferential surface of the wheel hub 3, that is, a pulse wheel. The rotation speed detection section is arranged opposite to the wheel 7, and the flange 22 and the outer peripheral surface of the wheel hub 3 are connected to each other. A seal 27 is installed between them to isolate the rotation speed detection section. As shown in FIG. 5, the pulse wheel 7 is shrink-fitted onto the outer peripheral surface of the wheel hub 3. They may be fitted and fixed.

[0008]

[Effect of the idea]

Sediment is deposited on the rotation speed detection part of the pulse wheel 7 and the rotation speed detection sensor 8, which are opposed to each other. etc., and the rotation speed detection part will not be worn out or damaged by dirt, etc. do not have.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a wheel mounting portion.

FIG. 2 is a sectional view of a conventional example.

FIG. 3 is a sectional view showing a first embodiment of the present invention.

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

FIG. 5 is a sectional view showing a third embodiment of the present invention.

[Explanation of symbols]

1 wheel, 2 bearing, 3 wheel hub, 4 tire,
5 Wheel, 7 Pulse wheel, 8 Rotation speed detection sensor, 11 Cover, 14 Seal, 20 Retainer, 2
1 seal receiver, 22 flange, 27 seal.

Claims (2)

[Scope of utility model registration request] 1. A wheel hub 3 is rotatably supported on an axle 1 via a bearing 2, a tire 4 is attached to the wheel hub 3 to form a wheel 5, and a ring-shaped cover 1 is attached to the axle 1.
1 is attached facing the outer circumferential surface of the wheel hub 3, a rotation speed detection sensor 8 is attached to this cover 11, and a pulse wheel 7 is provided on the outer circumference of the wheel hub 3 to serve as a rotation speed detection section. A wheel rotation speed detection device for a running vehicle, characterized in that a seal 14 is installed between the inner circumferential surface of the cover 11 and the outer circumferential surface of the wheel hub 3 on the outside of the detection section. 2. A wheel hub 3 is rotatably supported on an axle via a bearing 2, a tire 4 is attached to the outer peripheral surface of the wheel hub 3 to form a wheel 5, and a retainer 20 of the bearing 2 is provided.
A seal receiver 21 and a flange 22 are provided on the flange 22 and the wheel hub 3, and a rotation speed detection sensor 8 and a pulse wheel 7 are provided facing each other to form a rotation speed detection section. A wheel rotation speed detection device for a running vehicle, characterized in that a seal 27 is installed between the inner peripheral surface of the flange 22 and the outer peripheral surface of the wheel hub 3.