JP3262861B2 - Motorcycle 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 a motorcycle speed detecting device.

[0002]

2. Description of the Related Art As a means for measuring the speed of a rotating body, in addition to a conventional mechanical detecting device, a signal rotating body made of a magnetic material provided with projections at a constant pitch, and a rotating speed of the signal rotating body. There is known a more simplified electronic detecting device provided with a magnetic sensor for detecting an electric current.

However, when the latter electronic detecting device is used as a speed detecting device for a motorcycle, it must be installed in a place near the wheels where soil, dust, muddy water, or the like is likely to enter. In addition, there is a possibility that the measurement accuracy may be reduced due to contamination by soil and the like. Therefore, to make this practical,
It is necessary to provide a case or the like for protecting the detection device and take measures to prevent contamination. However, the special provision of such a protective case or the like has a problem that the periphery of the wheel is enlarged and extra parts are installed, thereby increasing the cost.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide an electronic detecting device as a speed detecting device for a motorcycle without taking special measures to protect against dirt or the like without using special components. It is an object of the present invention to provide a motorcycle speed detecting device which is made possible by skillful use.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, according to the present invention, a pair of right and left front forks is fixed so as to extend over the lower ends thereof.
Brake drum that is supported by the axle that rotates and rotates together with the wheel hub, and is fixed to the axle mounting part of one front fork
Is blurred for closing the lateral side opening of the brake drum
And a brake chamber to form a brake chamber.
Brake cam inside the brake panel
Shaft end that supports through and protrudes outside the brake cam
Next, connect the brake arm to the axle mounting part of one front fork.
And fix the brake arm so that it is
The motorcycle manipulating arm with brake wire, before
Serial arranged signals rotary body rotating together with the brake drum to brake chamber, the tip of the sensor for detecting the rotational speed of the signal rotator opposes to the signal rotator, and one of the previous full
Behind the fork axle mounting point
And fixed to the through hole of the brake panel
A brake wire extending rearward from the brake arm.
In which the wire passes under the sensor .

As described above, by utilizing the existing brake space formed by the brake drum in the drum brake and the brake panel opposed thereto, a countermeasure against contamination can be taken without using any special parts, and high-precision measurement can be performed. enable.

[0007]

1 shows a scooter type motorcycle equipped with a speed detecting device according to the present invention. The vehicle body frame 1 rotatably supports a steering shaft 3 on a steering shaft tube 2 at the front end, and supports a pair of left and right front forks 4 at the lower end of the steering shaft 3 so as to freely turn left and right. The front wheel 5 is supported at the lower end of the fork 4. An engine unit 7 is swingably suspended at a rear portion of the body frame 1 via an engine bracket 6, and a shock absorber 8 is interposed between the rear end and the body frame 1. 7,
An engine 9 is mounted on the front side, and a rear wheel 10 is mounted on the rear side.
Is supported. Reference numeral 11 denotes a vehicle speed detecting device according to the present invention, which will be described in detail below.

FIG. 2 shows the details of the front wheel portion provided with the vehicle speed detecting device 11, wherein an axle 22 is fixed to the lower ends of a pair of left and right front forks 4, 4 so as to straddle both. On the other hand, the front wheel 5 is rotatably supported via an axle tube 21 welded to the axis of the hub 20. Axle tube 2
A brake drum 23 is welded to the outer periphery of 1 so as to be housed inside the hub 20. A brake panel 24 is provided to face the brake drum 23 so as to close the opening thereof, and a brake chamber B is formed inside the brake panel 24. The brake panel 24 is fixed to the axle mounting portion 4a of the front fork 4 by a bolt (not shown) so as not to rotate.

In the brake panel 24, a fulcrum pin 25 for pivotally supporting a pair of left and right brake shoes 26 is fixed on an upper side, and a brake cam 27 is rotatably penetrated and supported on a lower side. The brake cam 27 has a brake arm 28 fixed to an end protruding outside the brake cam 27, and the brake arm 28 is rotated by remote control using a brake wire 28a . By the rotation of the brake cam 27, the interval between the lower end portions of the pair of left and right brake shoes 26 is expanded and contracted, and when expanding, the brake drum 23 is pressed to brake the front wheel 5. A rubber band 2 is provided around the brake drum 23.
9 is wound to prevent noise during braking.

In the brake drum having the above-described structure, serration grooves having a constant pitch are formed at the end of the axle tube 21 in the brake chamber B, so that the signal rotating body 31 is formed.
Are formed. The magnetic sensor 30 fixed to the through hole 24a of the brake panel 24 faces the signal rotator 31. The magnetic sensor 30 and the signal rotator 31 constitute the vehicle speed detecting device 11 of the present invention. When the signal rotator 31 rotates together with the front wheel 5, the magnetic sensor 30
Detects the vehicle speed by counting the number of passages through the serration grooves on the signal rotator 31.

As described above, since the vehicle speed detecting device 11 is provided in the brake chamber B surrounded by the brake drum 23 and the brake panel 24, earth and sand, dust, muddy water and the like do not enter, and the vehicle speed detecting device 11 has high accuracy. Speed detection can be performed. In addition, such a protection effect can be achieved without using any special parts only by using the existing brake drum 23 and brake panel 24. Moreover, the illustrated
So that the brake arm 28 is
Fixed so as to be located inward in the vehicle width direction from the shaft mounting portion 4a,
Operate the brake arm 28 with the brake wire 28a
In the motorcycle, the rotation speed of the signal rotator 31 is
The magnetic sensor 30 to be detected is used to axle the front fork 4
Behind the attachment portion 4a so as to be located inward in the vehicle width direction.
While being fixed to the through hole 24a of the brake panel 24,
Brake wire 2 extending rearward from brake arm 28
8a has passed under the magnetic sensor 30,
The front fork 4 and the brake wire
Projections on the road and pebbles that the front wheel jumps up by the ya 28a
Can be protected from

FIGS. 3 to 5 show other modified examples of the vehicle speed detecting device. In the embodiment shown in FIG. 3, the magnetic sensor 30 is provided obliquely with respect to the axle direction. Correspondingly, the signal rotator 3 fixed to the outer periphery of the axle tube 21
1 is formed in a helical gear shape. In the embodiment shown in FIG. 4, the signal rotator 31 is made of a material different from that of the axle tube 21, and it is dog-fitted to the end of the axle tube 21.
The bearing is supported by a needle bearing 33 or the like. In the case of this embodiment, as the material of the signal rotator 31, for example, a material such as pure iron which can easily increase the magnetic flux density can be selected, whereby the detection accuracy can be further improved.

In the embodiment shown in FIG. 5, the signal rotator 31 is
As shown in the figure, a large number of convex portions 31a are formed in a ring shape on the lateral side surface of the brake drum 23 by half piercing. Further, the magnetic sensor 30 is configured to abut one end of the fulcrum pin 25, and the other end of the fulcrum pin 25 is configured as an auxiliary magnetic sensor 30 'so as to face the half-pierced convex portion 31a. In this embodiment, the signal rotator 31 having a large diameter can be formed, thereby enabling more accurate speed detection.

In any of the above-mentioned embodiments, the existing brake drum 23 and brake panel 24 are used as protection measures for the speed detecting device as in FIG. 2 described above, and special parts are used. This enables high-accuracy speed detection without any need. FIG. 7 is a reference example of a comparative example in which a disc brake which does not correspond to the present invention is provided. The disc brake is configured so that a brake disc 43 is welded to the outer periphery of the axle tube 21 and the brake disc 43 is pressed by a caliper 44.
The signal rotator 31 of the vehicle speed detecting device 11 is formed separately from the axle tube 21 as in the embodiment of FIG. 4 and is dog-fitted to the end of the signal rotator 31. The signal rotator 31 and the magnetic sensor 30 are covered with a special case 34 instead of using existing parts as a measure for preventing intrusion of earth and sand.

[0015]

As described above, the present invention provides a brake room
A signal rotator that rotates with the brake drum is placed in
The tip of the sensor for detecting the rotation speed of the signal rotator is
Fixed to the through hole of the brake panel so as to face the rotating body
Because to perform the dirt protection without the use of special parts, it is possible to enable the measurement of high precision. Moreover,
Position the sensor behind the axle mount on one front fork.
Through hole in the brake panel so that it is located inward in the vehicle width direction.
To the inside of the axle mounting part in the vehicle width direction.
Brake wire extending rearward from the specified brake arm
The sensor and its sensor
Lead wire on the road by front fork and brake wire
It can protect against objects and pebbles from which the front wheel jumps.
You.

[Brief description of the drawings]

FIG. 1 is a side view of a motorcycle equipped with a speed detecting device of the present invention.

FIG. 2 is a longitudinal sectional view showing details of a front wheel portion provided with a speed detecting device in the motorcycle of FIG.

FIG. 3 is a longitudinal sectional view corresponding to FIG. 2, showing another embodiment of the present invention.

FIG. 4 is a longitudinal sectional view corresponding to FIG. 2 and showing still another embodiment of the present invention.

FIG. 5 is a longitudinal sectional view corresponding to FIG. 2 and showing still another embodiment of the present invention.

FIG. 6 is a front view showing a half surface of a brake drum used in the embodiment of FIG. 5;

FIG. 7 is a longitudinal sectional view corresponding to FIG. 2 and showing a comparative example when a disc brake is provided.

[Description of Signs] 4 Front fork 4a Axle mounting portion 5 Front wheel 11 Vehicle speed detecting device 20 Hub 21 Axle tube 22 Axle 23 Brake drum 24 Brake panel 24a Through hole 27 Brake cam 28 Brake arm 28a Brake wire 30 Magnetic sensor 30 'Auxiliary magnetism Sensor 31 Signal rotator B Brake chamber

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B62J 39/00 B60T 8/00 G01P 3/488

Claims (1)

(57) [Claims] (1) A straddle extends between lower ends of a pair of left and right front forks.
A brake drum supported by a fixed axle and rotating integrally with the wheel hub, and axle mounting of one front fork
It is fixed to the part closing the lateral side opening of the brake drum
Brake by a panel to form a brake chamber, brake panel lower portion of the brake cam of the brake chamber to
Rotatably penetrates and protrudes outside the brake cam
Attach the brake arm to the front fork
Fix it so that it is located inward of the shaft mounting part in the vehicle width direction.
A motorcycle that operates the rake arm with a brake wire
Oite, wherein placing a signal rotator which rotates together with the brake drum to brake chamber, the tip of the sensor for detecting the rotational speed of the signal rotator opposes to the signal rotator, and the previous one
Behind the fork axle mounting section and inward in the vehicle width direction
When it is fixed in the through hole of the brake panel so that it is located
In both cases, a brake wire extending rearward from the brake arm
A motorcycle speed detection device passing under the sensor .