JP3139559B2 - Motorcycle wheel speed detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting the number of rotations of a wheel of a motorcycle, and more particularly to an improvement in the position of a rotation number sensor for widening the distance between the bearings of a wheel so that the size of the bearings can be reduced. About.

[0002]

2. Description of the Related Art A wheel rotation speed (rotation speed) signal is used as a vehicle speed display signal and as an antilock control signal for front and rear wheel steering and braking. As a device for detecting the number of rotations of a wheel, there is a device described in, for example, JP-A-62-138762. In this case, the axle of the front wheel is supported by a frame member via two bearings arranged without a gap in the axial direction. A gear is formed axially outside the bearing of the axle, and a gear box having a pinion meshing with the gear is disposed axially outside the bearing.

[0003]

Here, the load of the vehicle body acts upward at the center of the ground contact surface of the tire. In designing the vehicle body, it is usually considered that the line of action of the vehicle body load passes through substantially the center of the bearing portion so that the vehicle body load does not generate a bending moment on the bearing portion. However, the tire of a motorcycle has a circular arc shape when viewed in a cross section, so that the vehicle body can be largely tilted left and right to perform cornering. At this time, since the center of the ground contact surface of the tire moves to the side of the vehicle body, the line of action of the vehicle body load passes through a position distant from the center of the bearing, and a moment is generated in the bearing. Therefore, when a pair of bearings is used for the bearing portion and the distance between the two bearings is increased, the load on the bearing caused by the moment is reduced, and the diameter of the bearing can be reduced. However, in the above-mentioned conventional device, since the gear box is provided on the outer side in the axial direction of the bearing, if the distance between the bearings is increased, the gear box protrudes outward. Therefore, in order to secure the required bearing load, the bearing must be large in diameter, and the weight of the bearing portion increases accordingly, and as a result, the unsprung load of the suspension device increases,
There is a problem that followability deteriorates.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has an object to provide a wheel rotation speed detecting device for a motorcycle which can increase the bearing interval, downsize the bearing and reduce the weight of the portion. It is intended to provide.

[0005]

According to the present invention, an axle is rotatably supported via a pair of bearings disposed at a distance in a bearing case, and a wheel is fixed to one end of the axle. In the cantilevered wheel speed detection device of the motorcycle, in the shaft diameter of the fitting portion of the wheel fixed end side bearing of the axle,
The diameter of the fitting portion of the non-fixed end side bearing is made smaller to make the axle tapered, and the outer peripheral surface of the axle between the two bearings and near the non-fixed end side bearing is detected by serration processing. Forming a portion, and arranging a rotation speed sensor in a portion corresponding to the detected portion of the bearing case, and making the detection portion of the rotation speed sensor face the detected portion with a predetermined gap. Features.

[0006]

According to the wheel rotational speed detecting device of the present invention, the detected portion is formed in the portion between the bearings of the axle, and the rotational speed sensor for detecting the rotational speed of the detected portion is provided. However, the rotation speed sensor does not protrude outward in the axial direction. Therefore, by increasing the bearing interval, the bearing can be reduced in diameter while securing the necessary bearing load, and the weight of the bearing portion can be reduced. Also, with respect to the shaft diameter of the fitting portion of the wheel fixed end side bearing of the axle, the fitting portion shaft diameter of the anti-fixed end side bearing is formed smaller to make the axle tapered, and the outer peripheral surface of the portion near the anti-fixed end side bearing is formed. Since the detected portion is formed by serration, the outer diameter of the detected portion can be formed to be slightly smaller than the inner diameter of the fixed end bearing. Therefore, even if the fixed end bearing is located at one end of the axle and is sandwiched between the disc-shaped boss for fixing the wheel and the detected part, and the detected part is integrally formed with the axle, there is no problem. The axle can be inserted into the bearing without the need, and the detected part does not need to be formed by insertion of another part, and the number of parts and the number of assembly steps do not increase.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 to 4 are views for explaining a front wheel suspension system for a motorcycle according to one embodiment of the present invention. FIG. 1 is a sectional view taken along the line II of FIG. 3, and FIGS. 2 and 3 are plan views and side views. , FIG.
FIG. 1 is a left side view of a motorcycle provided with the embodiment device.

In FIG. 1, reference numeral 1 denotes a motorcycle equipped with the apparatus of the embodiment, and reference numeral 2 denotes a so-called diamond-shaped body frame having an engine unit 8 as a part of the frame. In the vehicle body frame 2, the rear ends of a pair of left and right upper frames 4, extending obliquely downward and rearward from the head pipe 3, are connected to the upper end of a rear arm bracket 5, and extend substantially horizontally forward at the lower end of the bracket 5. Connect the rear ends of a pair of left and right lower frames 6 and 6
The engine unit 8 is suspended and supported by the lower frame 6 and the cylinder body 8 of the engine unit 8 is supported.
a and the head pipe 3 are connected by a pair of left and right down tubes 7.

A fuel tank, an air cleaner and the like are mounted above the engine unit 8 and are covered with a tank cover 9. A radiator 10 is disposed in front of the engine unit 8, and is attached to the down tube 7. In addition, 1
Reference numeral 1 denotes a seat disposed behind the tank cover 9. A pivot 12a at the front end of the rear swing arm 12 is pivotally supported by the rear arm bracket 5 so as to be vertically swingable. A rear wheel 13 is pivotally supported at the rear end of the rear swing arm 12.

A front wheel steering device 14 is supported by the head pipe 3. The front wheel steering device 14 supports a steering knuckle 16 for pivotally supporting the front wheel 15, which is slidable in the axial direction and rotatable around the axis, and a steering force from a steering handle 17. And a steering mechanism 18 for transmitting the force.

The steering knuckle 16 is composed of a knuckle portion 19 for supporting the front wheel 15 at a lower end thereof, and a steering shaft 20 fixed to an upper end of the knuckle portion 19. The knuckle portion 19 has a curved shape extending from the center in the width direction of the upper edge of the front wheel 15 to the axle through the side of the knuckle portion 19, and a bearing case 21 is fixed to a lower end thereof. In addition, the steering shaft 2
Numeral 0 is formed by forming two ball grooves 20a on the left and right side surfaces of the round bar, and has a length whose upper end is located near the lower end of the head pipe 3 in a normal state.

The steering mechanism 18 includes a lower steering cylinder 22 mounted on the steering shaft 20 so as to be axially movable and non-rotatable.
An upper steering barrel 23 inserted in the head pipe 3 so as to be axially immovable and rotatable, and the upper and lower steering barrels 2
And a universal joint 24 that connects the first and second vehicles 23 to each other so as to be rotatable around a vehicle longitudinal axis a and a vehicle lateral axis b.

The lower steering cylinder 22 contains two sets of steel balls 25, each set of which is fitted into a ball groove 20 a of the steering shaft 20. A pair of front and rear connecting arms 22a are integrally formed on the upper edge of the lower steering cylinder 22 so as to protrude upward. The arm 22a is located on the vehicle front-rear shaft a of the joint ring 26. Before and after 26
a is rotatably inserted. The above joint ring 2
The left and right shafts 26b located on the vehicle left / right shaft b are rotatably inserted into a pair of left and right connecting arms 23a at the lower edge of the under bracket 23a. The under bracket 23a is fixed to the upper steering cylinder 23, and thus the universal joint 24 is formed. Reference numerals 27 and 28 denote dust boots surrounding the universal joint 24 and the steering shaft 20.

A handle holder 29 is provided at an upper end of the upper steering cylinder 23 projecting upward from the head pipe 3.
Is fixed. A slide shaft 30 to which the steering handle 17 is fixed is inserted into the handle holder 29 so as to be vertically slidable, and the slide shaft 30 can be fixed at a predetermined height position. Reference numeral 31 denotes a cap for closing the upper end opening of the upper steering cylinder 23.

A front swing arm 39 is pivotally supported at the front end of the lower frame 6 of the vehicle body frame 2 so as to be vertically swingable. The front swing arm 39 has a pair of left and right arm portions 40 and 41 integrally connected by a cross member portion 42, and extends the left arm portion 40 to the vicinity of the axle 33 of the front wheel 15. Shape.
Pivot portions 40a, 41a formed at the rear ends of the left and right arm portions 40, 41 are supported by a shaft support portion 6a of the lower frame 6 via a tapered bearing 43.

An extension 40b of the left arm 40
Is bent inward in the vehicle width direction, and a ball joint 44 is fixed to a boss 40c formed at the front end thereof. This ball joint 44 is a rod-shaped stud 44
A spherical ball 44b is integrally formed at the tip of a, and is disposed in a ball case 44c. The stud 44a faces in the vehicle width direction. The ball 44b is on an extension of the steering shaft 20 and the front wheel 15
The ball case 44c is supported by a ball receiving portion 19a formed near the axle of the knuckle portion 19. This allows
The steering knuckle 16 moves up and down on an arc having the radius of the front swing arm 39 and rotates around the axis of the steering shaft 20.

A cushion unit 45 is disposed below the cross member portion 42 of the front swing arm 39 in the vehicle width direction. This cushion unit 4
Reference numeral 5 denotes a coil sprink 45b mounted around a damper 45a.
The front swing arm 39 is connected to a connecting portion between the pivot arm portions 40 and 41 of the front swing arm 39 and the cross member portion 42.

A bearing case 21 is fixed to the lower end of the steering knuckle 16. A pair of left and right tapered bearings 31, 32 are arranged in the case 21 at an interval in the axial direction, and an axle 33 of the front wheel 15 is supported by the two bearings 31, 32. A disk-shaped boss 33b formed at one end of the axle 33 has a holder 35 having a disk 34 on its outer periphery fixedly fastened by bolts, and the boss 33b has a wheel 36 of the front wheel 15 attached thereto.
5 is fixed by bolts. Reference numeral 37 denotes a wheel cylinder that generates a braking force by sandwiching the disk 34, and is fixed to the inner surface of the knuckle portion 19 by bolts.

The left and right bearings 3 of the axle 33
Between the parts 1 and 32, the detected part 33 by the serration processing is provided.
a is formed. A rotation speed sensor 38 is bolted and fixed to the bearing case 21 between the left and right bearings 31 and 32. The rotation sensor 38 is of an electromagnetic induction type non-contact type in which a magnet and a coil are housed in a housing, and a detection unit 38a thereof faces the detection target 33a with a predetermined gap.

Next, the operation and effect of this embodiment will be described. In the wheel rotation speed detecting device of the present embodiment, when the front wheel 15 rotates due to the running of the vehicle, the detected portion 33a of the axle 33
(Surface irregularities due to serrations) rotate the detecting portion 38a, whereby the magnetic flux generated from the magnet and passing through the coil changes with time. As a result, an AC voltage having a frequency proportional to the rotation speed of the detected portion 33a, that is, the axle 33, is generated at both ends of the coil, and the voltage is extracted as a rotation speed signal.

In this embodiment, since the rotation speed sensor 38 operating as described above is disposed between the bearings 31 and 32, the rotation speed sensor 38 projects outward even if the bearing interval is widened. There is no. Therefore, the bearing interval can be widened, and a small-diameter bearing can be adopted. As a result, the weight around the bearing can be reduced, and the followability of the suspension device can be improved. In addition, the space between the bearings 31 and 32 is conventionally sealed, and the sensor 38 is provided in the sealed portion, so that it is not necessary to employ a special sealing structure.

Further, in this embodiment, since a non-contact type sensor is employed as the rotational speed sensor, the reliability can be improved as compared with the above-mentioned gear type sensor, the running resistance can be reduced, and the fuel consumption rate and the like can be reduced. Is advantageous. Further, only the serration processing is required for the detected part 33a, so that the structure can be simplified and the number of parts can be reduced. Furthermore, since it is arranged inside the foil, there is an effect that it can be protected from external force.

The diameter of the fitting portion of the bearing 32 on the opposite fixed end side is made smaller than the fitting portion of the bearing 31 on the wheel fixed end side of the axle 33 so that the axle 33 is tapered. Since the detected portion 33a is formed on the outer peripheral surface of the portion close to the bearing 32 by serration, the outer diameter of the detected portion 33a can be formed to be slightly smaller than the inner diameter of the fixed end side bearing 31. Therefore, even when the fixed end bearing 31 is located at one end of the axle and is sandwiched between the disc-shaped boss for fixing the wheel and the detected portion, and furthermore, the detected portion is integrally formed with the axle, The axle can be fitted into the bearing without any trouble, and the detected part does not need to be formed by fitting another part, and the number of parts and the number of assembly steps do not increase.

[0024]

As described above, according to the wheel rotation speed detecting device for a motorcycle according to the present invention, the detected portion is formed between the bearings of the axle and the rotation speed sensor is disposed between the bearings. In addition, a bearing having a small diameter can be employed by widening the bearing interval, and the weight of the bearing portion can be reduced. Also, with respect to the shaft diameter of the fitting portion of the wheel fixed end side bearing of the axle, the fitting portion shaft diameter of the anti-fixed end side bearing is formed smaller to make the axle tapered, and the outer peripheral surface of the portion near the anti-fixed end side bearing is formed. Since the detected part is formed by serration processing, the outer diameter of the detected part can be formed to be slightly smaller than the inner diameter of the fixed end side bearing, and the axle and the man-hour can be reduced without increasing the number of parts and the number of assembly steps.
The bearing can be assembled.

[Brief description of the drawings]

FIG. 1 is a sectional view taken along the line II of FIG. 3, showing a motorcycle rotational speed detecting device according to an embodiment of the present invention.

FIG. 2 is a plan view of the apparatus of the embodiment.

FIG. 3 is a side view of the apparatus of the embodiment.

FIG. 4 is a left side view of a motorcycle equipped with the embodiment device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motorcycle 15 Front wheel 16 Steering knuckle (frame member) 31, 32 Bearing 33 Axle 33a Detected part 38 Revolution sensor

Continuation of the front page (56) References JP-A-62-138762 (JP, A) JP-A-3-6458 (JP, A) JP-A-3-14019 (JP, A) JP-A-1-81573 (JP) (U, JP) U.S.A. 2-148469 (JP, U) U.S.A. H. 3-85575 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B62J 39/00 B60B 27/00 B60T 8/00 G01P 1/04

Claims (1)

(57) [Claims] 1. An air conditioner having a space provided in a bearing case.
An axle is pivotally supported via a pair of bearings, and a wheel is attached to one end of the axle.
The motorcycle is fixed and cantilevered by the above bearing case.
In the wheel rotation speed detection device, the wheel fixed end side of the axle
The shaft diameter of the fitting part of the bearing on the side opposite to the fixed end with respect to the shaft diameter of the bearing fitting part
Is formed smaller to taper the axle,
Between the two bearings and outside the portion near the bearing opposite to the fixed end side
Form a detected part on the peripheral surface by serration
At the part corresponding to the detected part of the bearing case,
And the detection unit of the rotation speed sensor
A device for detecting the number of revolutions of a wheel of a motorcycle, wherein the detected portion is opposed to the detected portion with a predetermined gap .