JP2570938Y2 - Sealing device with rotation detector - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing structure for a wheel bearing portion which rotates relatively, and more particularly, to a sealing device having 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 wheel rotation speed detecting device for preventing skid of an automobile. That is, the rotation detecting device includes a toothed rotor and a sensing sensor,
At this time, it is common that the bearings are arranged apart from the sealing device for sealing, and constitute one independent rotation detecting device. Hereinafter, this will be described in detail with reference to the drawings.

In such a conventional example, as shown in FIG. 6, a toothed rotor (7) fitted to a rotating shaft (6) is rotated by a rotation speed detecting sensor (9) attached to a knuckle (8). The structure which detects and detects is shown. Here, the bearing (10) is protected from intrusion of moisture or foreign matter by a sealing device (A) provided independently on its side.

[0004]

However, such a structure of the rotation speed detecting device requires a dedicated space for mounting the toothed rotor (7) and the rotation speed detecting sensor (9), and further requires a sealing device (9). It is inevitable to have a complicated structure such as the arrangement of A), and the press-fitted portion needs to be precisely polished to ensure the detection accuracy. Also, the change in the gap between the rotation speed detection sensor (9) and the toothed rotor (7) due to the deflection caused by the load during operation has had an adverse effect on the detection accuracy. SUMMARY OF THE INVENTION The present invention has been made in view of the above-described drawbacks, and has as its object to provide a sealing device having a wheel rotation detecting device which has reduced mounting space and has greatly improved sensing performance and sensing durability.

[0005]

The present invention will be described with reference to the drawings. As shown in FIG. 1, the present invention comprises a combination of a seal member (1) for sealing a wheel bearing portion for an automobile and a slinger (2). A sealing device with a rotation detecting device,
The axis of the slinger (2) facing the sealing member (1)
Seal lips (3) sliding in the radial and radial directions
(3 ′), and the slinger (2) as shown in FIG.
Pole Li forming the magnetic poles alternately the recess bottom with a recess (4a) to the tip of an elastic magnetic material to (4b) circumferentially has to
The seal (4) is disposed between the plurality of seal lips (3) and (3 ') so as to protrude, and the magnetic pole is attached to the seal member (1 ).
The rotation detector (5) for sensing the magnetic pole lip (4)
It is characterized by being provided in contact with each other.

A sealing device with a rotation detecting device comprising a combination of a seal member (1) and a slinger (2), wherein the seal member (1) has a shaft of a slinger (2).
Seal lips (3) sliding in the radial and radial directions
(3 ') is provided, and the slinger (2) is made of an elastic material and has a concave portion (4a) at the tip and a concave portion (4b) at the bottom (4b) of FIG.
A magnetic pole lip (4) in which a core bar (4d) having slits arranged circumferentially or a ring (4e) in which magnetic poles are alternately formed on the circumference is mounted as shown in FIG. Magnetic pole lip (4) with alternating concave and convex portions (4c )
Is provided at a position between the plurality of seal lips (3) and (3 '), and the magnetic pole lip (4) is brought into contact with a seal member (1) provided with a rotation detector (5) for sensing a magnetic pole. It is characterized by:

[0007]

The present invention has the following excellent functions with the above structure. That is, the slinger (2) attached to the rotating member and the sealing member (1) attached to the fixed member.
While carrying the rotation detection component respectively, the sealing lip (3) pole liter flop (4) surrounded by (3 ') of the sealing member (1) is completely isolated outside and from the inside, Accurate and stable rotation detection is performed while being protected from the adhesion of foreign matter from the outside or lubricating oil or the like inside.
Further, since the magnetic pole lip (4) is made of an elastic magnetic material or an elastic material, and is provided so as to protrude from the slinger (2), it has extremely high flexibility and followability, so that erroneous detection due to vibration, deflection, or the like can be prevented. It can be completely prevented. To obtain this flexibility and followability, the pole lip
At the base of (4) , as shown in FIGS.
1) is provided or a slit (42) is arranged.

In the case of such a combined seal in which a plurality of members are combined, since the dedicated members are attached to bearings which have been polished with high precision, the arrangement of each seal portion, the position of the rotation detecting portion, and the gap therebetween. Are extremely accurately arranged, and even if they are fitted together, all the mounting is completed, so that the assembling process is greatly reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A magnetic pole lip made of an elastic magnetic material according to the present invention.
In the case of (4) , instead of alternately forming magnetic poles circumferentially as shown in FIG. 2, irregularities (4c) may be alternately formed circumferentially as shown in FIG. In this case, as shown in FIG. 3, a core metal (4d) having slits arranged on the periphery is embedded and mounted, or a ring (4e) having magnetic poles formed alternately on the periphery is embedded and mounted, and the rotation speed is set to this. The rotation speed may be detected by bringing the detector (5) closer. In addition, in the present invention, the magnetic pole is transferred to the slinger (2).
The tip (4) is protrudingly arranged, but the shape of the tip is such that the tip is brought into contact with the seal member (1) as shown in FIG. 1 and the recess (4a) is provided at the tip to form the gap. Is always kept constant and the concave portion (4a) can hold the lubricating oil, so that the sliding durability is also greatly improved. The elastic magnetic material according to the present invention is formed by mixing a powder or granular material such as a quench-hardening type material, a precipitation hardening type or a sintered type into an elastic material such as synthetic rubber or synthetic resin. .

[0010]

According to the present invention, the rotation detecting section is completely isolated from the outside and the inside by the seal lip (3) and the seal lip (3 '), and is protected from the adhesion of foreign matter or lubricating oil. Performs accurate and stable rotation detection. In addition, since it is directly combined with a high-precision sealing device, the mounting space is reduced and the sensing performance is greatly improved. In addition, the magnetic pole lip (4) of the present invention is made of an elastic magnetic material or an elastic material, and is protruded and provided with a flexible structure in some cases. Erroneous detection due to vibration, runout, and the like can be completely prevented. In addition, since the sealing device is a combination of two members each having a dedicated rotation speed detecting member, the arrangement of the seal portions and the position of the rotation detecting portion are extremely accurately arranged, which is advantageous in mounting.

[0011]

[Brief description of the drawings]

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

FIG. 2 is a schematic view of the rotor shown in FIG.

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

FIG. 4 is a partial cross-sectional view showing another embodiment of the present invention.

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

FIG. 6 is a sectional view showing a conventional example not using the present invention.

[0012]

[Explanation of symbols]

REFERENCE SIGNS LIST 1 seal member 2 slinger 3 seal lip 3 ′ seal lip 4 magnetic pole lip 4 a concave portion 4 b concave bottom portion 4 c concave and convex portion 4 d cored bar 4 e ring 41 arm portion 42 slit 5 rotation speed detector

Claims (6)

(57) [Scope of request for utility model registration] An automobile wheel bearing is provided adjacent to each other.
In the rotation detector equipped sealing device consisting of a combination of the mounted seal member (1) and forming a seal and the slinger (2) Te, the axial portion of the slinger (2) to said sealing member (1)
Plural seal lips (3) (3 ') sliding in radial direction
The slinger (2) is made of an elastic magnetic material, and has a concave portion (4a) at the tip and a magnetic pole lip (4) which is alternately arranged circumferentially at the bottom portion (4b) of the concave portion. (3) A rotation detector which protrudes and is disposed at a position between (3 ' ) and which senses a magnetic pole to the seal member (1).
(5) a rotation detector equipped sealing device, characterized in that provided by Taise' with the pole Clip (4). 2. The seal member (1) is provided with a plurality of seal lips (3) and (3 ') that slide in the axial direction and the radial direction of the slinger (2), and the elastic magnetic material is applied to the slinger (2). the recess bottom with a recess (4a) to the tip made from the body uneven portions alternately (4b) circumferentially poles liter flop forming the (4c) (4) said plurality of sealing lips (3) (3 ' 2. The sealing device with a rotation detecting device according to claim 1, wherein the sealing device is arranged to protrude at a position between the rotation detecting device and the rotation detecting device. 3. A sealing device with a rotation detecting device comprising a combination of a sealing member (1) and a slinger (2), wherein said sealing member (1) has an axial portion of a slinger (2).
Plural seal lips (3) (3 ') sliding in radial direction
The slinger (2) is made of an elastic material and has a concave portion (4
a) a magnetic pole lip provided with a core bar (4d) having slits arranged circumferentially at the bottom (4b) of the concave portion and mounted.
(4) a rotation detector that protrudes and is disposed at a position between the plurality of seal lips (3) and (3 ′ ), and detects a magnetic pole on the seal member (1).
(5) a rotation detector equipped sealing device, characterized in that provided by Taise' with the pole Clip (4). 4. A sealing device with a rotation detecting device comprising a combination of a sealing member (1) and a slinger (2), wherein said sealing member (1) has an axial portion of a slinger (2).
Plural seal lips (3) (3 ') sliding in radial direction
The slinger (2) is made of an elastic material and has a concave portion (4
a) and the magnetic poles are alternately arranged circumferentially on the bottom (4b) of the recess.
The formed ring (4e) to embed only mounted the pole ripple
A rotation detector for detecting a magnetic pole on the sealing member (1) by disposing a projection (4) at a position between the plurality of sealing lips (3) and (3 ') .
(5) a rotation detector equipped sealing device, characterized in that provided by Taise' with the pole Clip (4). 5. The pole lip according to claim 1, wherein said pole lip has a flexible arm.
The sealing device with a rotation detecting device according to 2, 3, or 4 . 6. A device according to claim 1, wherein a slit (42) is arranged at a base of said pole lip (4) .
The sealing device with a rotation detecting device according to 3, 4, or 5 .