JP2826688B2 - Rotation detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation detecting device for a bearing portion which rotates relatively, and more particularly, to a rotation detecting device for detecting front and rear wheel rotation in an anti-lock brake system of an automobile.

[0002]

2. Description of the Related Art Hitherto, the following structure has been widely used as an anti-skid rotation speed detecting device for preventing skid of an automobile. That is, the rotation detecting device is composed of a toothed rotor and a sensing sensor, and at this time, it is generally arranged so as to be separated from the sealing device for sealing the bearing, thereby constituting one independent rotation detecting device. It is. Hereinafter, this will be described in detail with reference to the drawings.

In such a conventional example, as shown in FIG. 4, a toothed rotor (6) fitted on a rotating shaft (5) is rotated by a rotation speed detecting sensor (8) mounted on a hub (7). The structure which detects and detects is shown. Here, the bearing (9) is protected from the invasion of moisture or foreign matter by a sealing device (A) provided independently on its side.

[0004]

However, such a structure of the rotational speed detecting device requires a special space for mounting the toothed rotor (6) and the rotational speed detecting sensor (8), and further requires a sealing device (8). It is inevitable to have a complicated structure such as the parallel arrangement of A), and is therefore susceptible to vibration or runout, and requires precise polishing of the press-fitted portion in order to ensure detection accuracy. The present invention has been made in view of the above-described drawbacks, and has as its object to provide a rotation detection device that detects a wheel rotation with a reduced mounting space and dramatically improved sensing performance.

[0005]

The present invention will be described with reference to the drawings. As shown in FIG. 1, a seal (1a) for sealing a bearing portion or a slinger (1) as shown in FIG.
b) A rotation detecting device mounted on a sealing member (1) such as b) for detecting the rotational movement of the bearing, wherein the sealing member (1) is made of synthetic rubber or synthetic resin as shown in FIG. An elastic member (2) is circumferentially arranged at equal intervals, and a rotation detecting sensor (3) comprising an ultrasonic transmitting / receiving device is formed close to the sealing member (1) and the elastic member (2). It is characterized by.

[0006]

According to the present invention, the above-mentioned structure has the following excellent effects. That is, a radial member such as a sealing member (1) fixed to a rotating shaft, for example, a seal (1a) in which a plurality of members are combined as shown in FIG. 1, or a slinger (1b) as shown in FIG. Or baking and attaching an elastic member (2) such as synthetic rubber at equal intervals in a circumferential manner,
Alternatively, as shown in FIG. 3, the elastic member (2) is provided with a slit (4) and is baked and formed at regular intervals, and as shown in FIG. 2, a fixing portion capable of sensing the seal (1) and the elastic member (2). The rotation is detected by a rotation detection sensor (3) attached to the camera. The rotation detecting sensor (3) detects and measures the difference in the intensity and phase of the reflection by transmitting and receiving the ultrasonic wave.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to carry out the present invention, the elastic member (2) provided on the sealing member (1) may be provided on the side facing the bearing (9) or on the opposite side thereof. In addition to providing the elastic member (2) in the circumferential direction of the seal (1a) as shown in (1), if the seal (1a) can be extended in the axial direction, it is provided on the axial portion (not shown) and rotated. The detection sensor (3) may be oriented in the circumferential direction. Although the seal (1a) shown in FIG. 1 is a set seal structure in which a plurality of members are combined, for example, a single seal (not shown) in which a reinforcing ring is attached to a seal lip may be used.

When the elastic member (2) is provided on a slinger (1b) having a shaking-off / blocking action as shown in FIG. 3, a radial portion thereof is required due to the required action of the slinger (1b). It is preferable to provide a function and effect.

Further, when the elastic member (2) is provided, if the slits (4) as shown in FIG. 3 are arranged and are baked at equal intervals, other portions of the sealing member (1), for example, fitting. An elastic material can also be provided around the portion and the like, so that the sealing function can be improved and the fitting force can be increased, resulting in an advantageous structure.

[0010]

According to the present invention, by providing the rotation detecting sensor (3) for emitting and receiving ultrasonic waves on the elastic member (2), it is possible to accurately detect the intensity of the reflection and the phase difference. And reliable rotation detection is realized. Further, the conventionally used highly accurate toothed rotor (6) can be replaced by the sealing member (1), and the rotor is easily formed by the elastic member (2). This has an extremely useful effect in the accuracy and space saving obtained. Needless to say, the mounting process itself can be reduced because the mounting is accurately performed by the completion of the mounting of the sealing device (1).

[0011]

[Brief description of the drawings]

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

FIG. 2 is a schematic diagram showing the operation of the present invention.

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

FIG. 4 is a sectional view showing a conventional example not using the present invention.

[0012]

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sealing member 1a Seal 1b Slinger 2 Elastic member 3 Rotation detection sensor 4 Slit

Claims (1)

(57) [Claims] 1. A rotation detecting device mounted on a sealing member (1) such as a seal (1a) or a slinger (1b) for sealing a bearing portion for detecting a rotational movement of the bearing. (1) An elastic member (2) made of synthetic rubber or synthetic resin or the like is circumferentially disposed at equal intervals, and the elastic member (2) and the sealing member (1) are arranged.
Rotation detection sensor consisting of ultrasonic transmitter / receiver (3)
A rotation detection device characterized by being formed close to each other.