JPH0454907B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wheel speed detector suitable for two-wheeled vehicles.

Conventionally, the means for detecting wheel speed has been to use a toothed disc that rotates with the wheel and a single-pole detector (pickup) installed opposite the teeth of this disc.
However, there is a problem in that it is not necessarily suitable for the electric anti-lock system that has recently been adopted in practical motorcycles. In other words, in this type of anti-lock system, the number of detection pulses per rotation must be increased, whereas in the single-pole detector, there is a restriction that the tooth width of the disk cannot be made too small in order to obtain the induced voltage. Therefore, in order to detect the wheel speed by the above means, the diameter of the toothed disc must be made considerably large, but it is necessary to provide the motorcycle with an appropriate structure for this purpose, including a dust-proof structure. This is because it was structurally difficult.

Furthermore, for the purpose of solving such problems, a technique described in Japanese Utility Model Publication No. 17173/1983 has been proposed. This is done by inserting and fixing a housing containing a magnet, a coil, a fixing ring with facing concave and convex teeth, and a toothed rotor between the fork and the wheel hub on the outer periphery of a fixed shaft of a two-wheeled vehicle. The wheel speed detector has a configuration in which the toothed rotor is rotated by engaging a protruding pawl with a groove in the protruding end of the wheel hub.

However, as mentioned above, this detector is connected to the wheel hub for rotating the toothed rotor, which requires groove machining on the hub, making it difficult to share the hub between different car models. Since it is necessary to provide a structure that seals the hub from the outside air, including the engaging portion between the claw and the hub that extends out of the housing, there are difficulties in supporting the sealing member and the like.

Therefore, in the present invention, there is no need to perform different processing for each wheel hub of different vehicle models, and by forming a housing fixedly arranged on the fixed shaft side so as to surround the protruding end of the hub, the housing can be opened. We have developed a wheel speed detector that has a simple sealing structure in which a seal attached to the inner surface of the end snaps onto the outer periphery of the protruding end of the hub.

That is, the gist of the present invention is to include a sleeve that is fitted and fixed on a fixed shaft that supports a wheel in close proximity to a hub, one end of which has a closed end fixed to the sleeve, and the other open end of which is attached to the hub. A housing extends so as to surround the outer periphery of the circumferential projecting end, and the housing is attached to the inner periphery of the open end side of the housing and is slidably attached to the outer periphery of the hub projecting end, thereby preventing the inside of the housing from outside air. an oil seal for sealing, and a magnet disposed biased toward the closed end of the housing;
integrated with the hub via a coil that detects changes in magnetic flux, a toothed fixing ring, and a ring that is rotatably supported on the outer periphery of the sleeve inside the protruding end of the hub and is frictionally engaged with the inner surface of the hub. A wheel speed for a two-wheeled vehicle, comprising a toothed rotor connected to rotate, the toothed fixing ring and the toothed rotor facing each other to form a magnetic circuit surrounding a coil. It's in the detector.

The present invention will be described below based on embodiments shown in the drawings.

Embodiment 1 In FIG. 1, reference numeral 1 denotes a fixed shaft that supports a wheel. A fork 2, which is a vehicle body, is fixed to a part of the fixed shaft, and a wheel hub 4 is attached to this at a distant position via a bearing mechanism 3. Supported.

A sleeve 5 is fitted and fixed between the fork 2 of the fixed shaft 1 and the bearing mechanism 3. This sleeve 5 is preferably made of a magnetic material in order to eliminate the leakage magnetic flux of the magnetic circuit which will be described later, and since it is fixed by tightening the wheel hub 4 to the fork 2, it has a certain strength. It is necessary to have Furthermore, from the viewpoint of assembly, etc., it is preferable to integrate the structure with a housing described later.

Reference numeral 6 denotes a housing whose one end is fixed to the fork 2 side position on the outer periphery of the sleeve 5, and whose diameter increases toward the hub 4, and whose other open end is formed so as to surround the outer periphery of the hub protruding end ₄₁ .

Reference numeral 7 denotes an oil seal, which has a stepped portion 6 ₁ on the inner periphery of the housing 6 on the open end side.
and a dust cover 8 which is press-fitted and fixed to the inner periphery, and the inner periphery thereof is attached to the hub protruding end 4.
By snappingly engaging the outer periphery of the housing ₁ , the inside of the housing is sealed from outside air.

Note that since the outer periphery of the oil seal 7 and the hub protruding end ₄₁ slide relative to each other in the circumferential direction, it is preferable that the outer periphery of the hub protruding end be processed as a sliding surface.

Further, on the outer periphery of the sleeve 5 inside the housing 6, there are a ring-shaped magnet 9, a coil 10 for detecting changes in magnetic flux density, and a toothed fixing ring 11 having a large number of teeth formed along the circumferential direction of the inner circumferential surface. The teeth 11 ₁ of the toothed fixing ring 11 are installed so as to protrude in the inner circumferential direction of the hub protruding end 4 ₁ . Note that the coil 10 is connected to an external speed detection circuit (not shown) via a lead wire 12.

Furthermore, a toothed rotor 13 is rotatably supported on the sleeve 5 in the housing 6 at a position adjacent to the hub 4 adjacent to the magnet 9 and the coil 10, and the toothed rotor 13 is rotatably supported on the hub 4 until it engages with the bearing mechanism 3 of the hub. The rotation of the hub 4 is transmitted through a press-fit ring 14 press-fitted into the inner periphery of the protruding end 4 ₁ . A toothed portion 13 ₁ consisting of a large number of teeth along the outer circumferential direction of the toothed rotor 13 is opposed to the toothed portion 11 ₁ of the fixed ring 11 . , rotor 13, and magnetic plate 15 constitute a magnetic circuit surrounding coil 10. In the figure, 16 is a spacer for rotationally supporting the rotor 13, and 17 is a retaining ring for the rotor 13.

In the wheel speed detector having the above configuration, when the toothed rotor 13 rotates in accordance with the rotation of the hub 4, that is, the wheel, the magnetic flux of the magnetic circuit changes accordingly. A pulse signal is obtained, and this operation is the same as the conventional one.

In this example, the above configuration has the following structural advantages. In other words, since the part of the hub that is normally filled with an oil seal can be effectively used, the axial dimension can be reduced, and the oil seal 7 provided at the open end of the housing prevents oil from leaking and is sealed from the outside air. This has the effect that the system is securely stopped and the interior is completely protected. In addition, since the axial dimension of the detector can be shortened, the fork dimensions can be made the same as the conventional type, which is advantageous in terms of strength.The difference from the conventional type hub is that the outer periphery of the hub protruding end ₄₁ is simply machined. because there is,
Another advantage is that this detector can be shared between different car models.

Furthermore, when the tire is removed, the sleeve, coil, toothed fixing ring, toothed rotor, and oil seal all remain as a unit with the housing.

Embodiment 2 The embodiment shown in FIGS. 2 and 3 shows an example in which a brake bracket 2' as a fixed support of a disc brake device is used as a detector case. The vessels have almost the same common structure. Therefore, in this example, the parts common to those shown in FIG. 1 are shown with dashes attached to the reference numerals, and explanations thereof are omitted except for those that are particularly necessary.

In this example, as shown in FIGS. 2 and 3, a brake bracket 2' serving as a support (fixed support) for the so-called disc brake 18 is used as a detector case. Brake torque is transmitted to the brake bracket 2' as the brake is operated, and generally, the brake bracket 2' receives a torsional moment due to this torque transmission, so the connection and fixation of the brake bracket 2' and the fixed shaft 1' is difficult. The structure requires a fitting surface of a predetermined length in the axial direction. Therefore, in this example, the same strength relationship as that of the conventional fork connection structure of this type is maintained, and the length of the shaft-fixed portion of the brake bracket 2' and sleeve 5' in the axial direction is
The detector is located radially outward to prevent the overall axial dimension from increasing.

By changing the structure as described above, in this example, the sleeve 5' is connected to the flange 11' of the fixed shaft ₁ ' and the wheel hub 4.
At the fixed shaft flange side 1 ₁ ' of this sleeve 5', a cylindrical portion 2 ₁ ' of a brake bracket 2' of a certain length is fixed, and this brake The magnet ₉ ', the coil 10',
A toothed fixing ring 11' is arranged. Therefore, the toothed rotor 13' has a hub protruding end 4.
At a position slightly outward from ₁ ', the tooth 13
₁ ' is arranged to face the toothed portion 11 ₁ ' of the fixing ring 11', but the other construction is substantially the same as that shown in FIG. 1. Also in this example, the same effects as in the first embodiment described above can be obtained.

As described above, the wheel speed detector for a two-wheeled vehicle according to the present invention has the advantage that the wheel hub and the oil seal maintain good sealing properties, and the detector can be provided compactly within the housing. The oil seal, sleeve, coil, toothed retaining ring, and toothed rotor belong to the housing, not the wheel, so they all remain in the housing even if the wheel is removed. Therefore, compared to a case where some of these parts come off with the wheel, it is much easier to replace the wheel, and there is no risk of hitting some of the parts attached to the wheel when removing the wheel. It has the advantage of not causing any damage. Furthermore, since the toothed rotor is connected to the wheel hub through frictional engagement, there is no need to process hub grooves, which is very useful.

[Brief explanation of drawings]

Figure 1 is a longitudinal cross-sectional view of a detector showing a first embodiment of the present invention, Figure 2 is a diagram illustrating the entire mounting part of the detector according to the second embodiment, and Figure 3 is a diagram illustrating Figure 2A- It is a sectional view taken along the A line. 1, 1'...Fixed shaft, 1 ₁ '...Flange, 2 ₁ ...Fork, 2 ₁ '...Cylinder part, 2'...Brake bracket,
3, 3'... Bearing mechanism, 4, 4'... Hub, 4 ₁ ,
4 ₁ '...Hub protruding end, 5, 5'...Sleeve, 6,
6'...Housing, 6 ₁ , 6 ₁ '... Stepped part, 7, 7'
...Oil seal, 8,8'...Dust cover, 9,
9'...Magnet, 10,10'...Coil, 11,11'
…Toothed fixed ring (fixed ring), 11 ₁ , 11
₁ '...Tooth part, 12,12'...Lead wire, 13,1
3′...Toothed rotor, 13 ₁ , 13 ₁ ′...Toothed portion, 1
4, 14'... Press-fit ring, 15, 15'... Plate, 16, 16'... Spacer, 17, 17'... Retention ring, 18... Disc brake.

Claims (1)

[Claims] 1 A sleeve that is fitted and fixed on a fixed shaft that supports a wheel in close proximity to the hub; one end has a closed end fixed to the sleeve, and the other open end is connected to the outer periphery of the circumferential protruding end of the hub. an oil seal that is attached to the inner periphery of the open end side of the housing and is slidably attached to the outer periphery of the protruding end of the hub, thereby sealing the inside of the housing from outside air. , a magnet, a coil for detecting changes in magnetic flux, and a toothed fixing ring, which are biased toward the closed end of the housing, and rotatably supported on the outer periphery of the sleeve inside the protruding end of the hub;
and a toothed rotor connected to rotate integrally with the hub via a ring that is frictionally engaged with the inner surface of the hub, the toothed fixing ring and the toothed rotor facing each other. A wheel speed detector for a two-wheeled vehicle, characterized by forming a magnetic circuit surrounding a coil.