JPH11314565A - Anti-lock brake device for motor scooter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an anti-lock brake device for a motor scooter in which the detecting accuracy of a wheel speed sensor for a rear wheel and the resolution are made high, and the mounting structure of the wheel speed sensor is made simple. SOLUTION: A flange 39 is formed up at the rear wheel side of a transmission case main body 21. A closed end cylinder 41 forming an annular space 40 at the space interspaced with the flange 39 in the hub 26 of a rear wheel 23, is provided. A wheel speed sensor 35 is mounted to the flange 39 in such a way that the axial line is parallel with the axial line of a wheel shaft 27. An internal gear 42 to be detected by the detection part 35a of the wheel speed sensor 35, is provided for the inner circumferential part of the closed end cylinder 41.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-lock brake device for a scooter.

[0002]

2. Description of the Related Art Conventionally, an antilock brake device mounted on a vehicle includes a hydraulic control device interposed in a hydraulic system of a hydraulic brake, and an electronic control device for sending a control signal to the hydraulic control device. There is something.

The hydraulic control device comprises a rotary hydraulic pump driven by a motor, and a solenoid valve for switching an oil passage downstream of the hydraulic pump between a brake caliper side and a bypass side. The electronic control unit sends a control signal to the solenoid valve when the rotation of the wheel stops during braking, and at this time, the hydraulic pressure transmitted to the brake caliper side is momentarily reduced and then increased. .
The presence or absence of rotation of the wheel is detected by a wheel speed sensor including an electromagnetic pickup.

[0004] The wheel speed sensor has a detecting section comprising a permanent magnet and a coil, and detects a change in magnetic flux caused by teeth of a gear rotating with the wheel approaching or moving away from the detecting section. It has a structure.

[0005]

SUMMARY OF THE INVENTION The inventors have considered mounting the antilock brake device constructed as described above on a scooter. However, in order to realize this, the mounting position of the wheel speed sensor for detecting the rotation of the rear wheel has been a problem.

In order to equip a conventional scooter with a wheel speed sensor for detecting the rotation of a rear wheel, a wheel speed sensor is attached to a rear end of a transmission case of a unit swing type engine, and a gear type reduction gear in the transmission case is mounted. The detection unit of the wheel speed sensor is opposed to the gear. Since the lubricating oil for lubricating the speed reducer is stored in the portion where the gear type speed reducer is accommodated in the transmission case, in order to mount the wheel speed sensor at a position facing the gear, the lubricating oil is A seal member for preventing leakage is required, so that the number of parts increases and mounting work becomes difficult. In addition, lubricating oil and iron powder generated from the reduction gear adhere to the detection unit, and the detection accuracy is reduced. Further, if the gear is formed to have a large diameter, the rear end of the transmission case becomes large, and the bank angle of the vehicle body is reduced due to this. There is also a limit in increasing the resolution of a hologram.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and a scooter having a high detection accuracy and resolution of a wheel speed sensor for detecting rotation of a rear wheel and having a simple mounting structure for the wheel speed sensor. To provide an anti-lock brake device for a vehicle.

[0008]

In order to achieve this object, an anti-lock brake device for a scooter according to the present invention is arranged so that it is located on the rear wheel side of a transmission case of a unit swing type engine on the same axis as an axle. A flange is formed, a bottomed cylinder that forms an annular space between the rear wheel hub and the flange is provided, and a wheel speed sensor is mounted on the flange so that the axis is parallel to the axis of the axle. An internal gear detected by a detection unit of a wheel speed sensor is provided on an inner peripheral portion of the bottomed cylinder.

According to the present invention, the detection unit of the wheel speed sensor can be disposed outside the space for accommodating the gear type speed reducer inside the transmission case. For this reason, compared with the structure in which the detection unit is opposed to the gear of the speed reducer, the seal member does not need to be interposed in the wheel speed sensor mounting portion, so that the number of parts is reduced and the mounting operation of the wheel speed sensor is simplified. Become. In addition, since lubricating oil and iron powder generated from the reduction gear do not adhere to the detection unit of the wheel speed sensor, the detection accuracy is high.

[0010] Further, since a structure for detecting the internal gear provided on the hub of the rear wheel is adopted, the internal gear can be equipped by utilizing the space inside the rear wheel in the radial direction. As a result, the travel distance per pulse can be relatively shortened, that is, the resolution can be increased, without increasing the size of the rear end of the transmission case, as compared with the case where the rotation of the reduction gear is detected. .

The anti-lock brake device for a scooter according to another invention is the anti-lock brake device for a scooter according to the invention described above, wherein the labyrinth is provided between the outer peripheral portion of the flange and the opening edge of the cylinder facing the flange. A seal is formed. According to the present invention, the annular space into which the detecting portion of the wheel speed sensor is inserted is hardly foreign matter enters since the outer peripheral portion is sealed to the outside by the labyrinth seal.

An anti-lock brake device for a scooter according to another invention is the anti-lock brake device according to the above-described invention, in which the detection portion of the wheel speed sensor is formed in a rod shape and faces radially inward of the internal gear. Things. According to the present invention, even if the internal gear comes into contact with the detection unit when the rear wheel is removed from the transmission case during maintenance, the detection unit can bend by its own elasticity and reduce the impact.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of an antilock brake device for a scooter according to the present invention will be described in detail with reference to FIGS. FIG. 1 is a side view of a scooter equipped with an antilock brake device according to the present invention, and FIG.
FIG. 3 is a plan view showing a configuration of a vehicle body frame, FIG. 3 is an enlarged plan view showing a hydraulic control device, FIG. 4 is a perspective view showing a support structure of the hydraulic control device, and FIG.
FIG. 5 is a sectional view taken along line VV.

In these figures, the one designated by reference numeral 1 is a scooter according to this embodiment. The scooter 1 includes a low-floor footrest 4 between the steering handle 2 and the seat 3, and a luggage storage box 5 and a unit swing type engine 6 below the seat 3.

The steering handle 2 is rotatably supported together with a front fork 9 on a head pipe 8 of a body frame 7 described later. The front fork 9 is a conventionally known telescopic type, and has a front wheel 10 at a lower end.
Is rotatably mounted. The seat 3 has a structure in which a driver and a passenger can sit on the seat 3 and is supported by a vehicle body frame 7 via a bracket (not shown) so that the rear side of the vehicle body rotates vertically with the front end as a fulcrum. Let me.

The luggage storage box 5 is formed so as to open upward and is supported by the vehicle body frame 7, and the upper opening is opened and closed by the seat 3. The scooter 1 includes a vehicle body cover 11 that covers parts below the vehicle body frame 7 and the seat 3, similarly to a conventional scooter. The footrest plate 4 is formed integrally with the vehicle body cover 11.

The vehicle body frame 7 includes two types of down tubes 12 to extending from the head pipe 8 to the rear side of the vehicle body.
15 and a rear frame 17 connected to rear ends of these down tubes 12 to 15 via an engine mounting bracket 16.

The two types of down tubes 12 to 15
Are formed so as to form a pair in the vehicle width direction, respectively, and the down tubes 12, 13 positioned relatively lower than the down tubes 14, 15 on the upper side in the vehicle width direction as shown in FIG. Extends in the front-rear direction. The footrest 4
Are formed so as to cover these four down tubes 12 to 15 from above.

The engine mounting brackets 16 are also formed in pairs in the vehicle width direction, and are connected to each other by cross members (not shown). As shown in FIGS. 1 and 2, the rear frame 17 is provided on a lower pipe 18 formed in a horizontal U-shape that opens toward the front of the vehicle body in a plan view, and on the lower pipe 18. And an upper pipe 19. The upper pipe 19 is
The lower pipe 18 is formed so as to form a pair in the vehicle width direction.
Is extended so as to overlap the lower pipe 18 in plan view to the rear end.

The unit swing type engine 6 is swingably supported on the engine mounting bracket 16 via a link mechanism (not shown) so that the rear portion swings up and down. In the engine 6, a transmission case body 21 (see FIG. 5) integrally formed at the left end of the vehicle body of the crankcase 6a is extended to the rear side of the vehicle body. Crankcase 6a
Support bracket 22 attached to the right side of the vehicle (see FIG. 5)
Thus, the rear wheel 23 is rotatably supported. Further, a cushion unit 24 is interposed between the rear end of the transmission case main body 21 and the rear end of the support bracket 22 and the vehicle body frame 7 as shown in FIG.

As shown in FIG. 5, the rear wheel 23 includes a hub 26 integrally formed with a rim 25, an axle 27 connected to the hub 26 by spline fitting,
6 (see FIG. 1). The hub 26 can be detached from the axle 27 to the right side of the vehicle body during maintenance.

The axle 27 is rotatably supported by the transmission case body 21 and the support bracket 22 via bearings 29 and 30. The axle 27 is connected to a gear type speed reducer (not shown) at the left end of the vehicle body. The gear type speed reducer, a centrifugal clutch (not shown), and a V The engine 6 is connected to a crankshaft via a belt-type automatic transmission (not shown). The gear type reduction gear, the centrifugal clutch and the V-belt type automatic transmission have a transmission case main body 21 and
The transmission case body 21 is disposed in a space formed by the transmission case cover 31 attached to the left side of the vehicle body. In FIG. 5, the reference numeral 32 located outside the transmission case cover 31 denotes the transmission case cover 31.
Is an outer cover that covers from the outside.

The scooter 1 employs a hydraulic anti-lock brake device as a brake device for the front wheel 10 and the rear wheel 23. As shown in FIGS. 1 and 2, the anti-lock brake device includes an electronic control unit 33 disposed at a rear portion of a vehicle body and a wheel speed sensor for detecting whether the front wheel 10 or the rear wheel 23 is locked. 34, 35, and a hydraulic control device 36 disposed below the footrest plate 4.

The electronic control unit 33 is shown in FIGS.
As shown in FIG. 2, the vehicle body is disposed in a portion surrounded by the luggage storage box 5 disposed below the seat 3 at the rear of the vehicle body, the rear end of the rear frame 17, and the vehicle body cover 11 located behind the seat 3. The rear frame 17 is supported by a bracket (not shown) via a bracket (not shown). When the front wheel 10 or the rear wheel 23 is locked during braking, a control signal is sent to a hydraulic control device 36 described later. . Front wheel 1
It is detected by the wheel speed sensors 34 and 35 provided on the front wheel side and the rear wheel side whether or not the zero wheel or the rear wheel 23 is locked. As shown in FIGS. 1 and 2, the electronic control device 33 and the hydraulic control device 36 are disposed below the footrest plate 4 and supported by the relatively low down tube 13 on the right side of the vehicle body. 37 is supplied.

The wheel speed sensors 34, 35 are constituted by electromagnetic pickups and are supported by members which do not rotate near the hub 38 of the front wheel 10 and the hub 26 of the rear wheel 23. The detection unit is opposed to the teeth of the provided internal gear. The mounting structure of the wheel speed sensors 34, 35 will be described with reference to FIG. 5, taking the rear wheel side as an example.

The rear wheel speed sensor 35 shown in FIG.
Flange 3 formed on the rear wheel side of transmission case body 21
9, the axis is parallel to the axis of the axle 27, and the rod-shaped detecting portion 35 a at the tip is penetrated so as to protrude from the flange 39 to the right side of the vehicle body, and is fixed by a fixing bolt (not shown). The flange 39 is mounted on the axle 2
7, a wheel speed sensor 35 is mounted on a portion exposed from the outer cover 32, as shown in FIG.

In this embodiment, as shown in FIG. 1, the lower half of the wheel speed sensor 35 is covered by the outer cover 32 when viewed from the left side of the vehicle body.
By adopting such a configuration, the appearance of the vehicle body is not impaired even if the wheel speed sensor 35 is provided,
It is possible to prevent the wheel speed sensor 35 from being damaged by a third party.

The hub 26 of the rear wheel 23 has a bottomed cylinder 4 forming an annular space 40 with the flange 39.
1, and the internal gear 42 detected by the detection unit 35a is fixed to the inner peripheral portion of the bottomed cylinder 41. The detecting portion 35a faces the inside of the internal gear 42 in the radial direction and faces the tooth tip.

Further, an outer peripheral portion of the flange 39 and an opening edge of the bottomed cylinder 41 are formed in a labyrinth-like cross-sectional shape in which a labyrinth seal is formed therebetween. The labyrinth seal is indicated by reference numeral 43 in FIG.

By attaching the wheel speed sensor 35 to the flange 39 of the transmission case main body 21 in this manner, the rotation of the rear wheel 23 can be detected by the wheel speed sensor 35. Similarly to the rear wheel side, the front wheel side wheel speed sensor 34 is also positioned so that the axis is oriented in the vehicle width direction, and a detection unit is provided radially inside an internal gear (not shown) that rotates together with the hub 38. I'm facing.

The hydraulic control unit 36 is interposed in a hydraulic system between hydraulic disc brakes 44 and 45 provided on the right side of the vehicle body of the front wheel 10 and the rear wheel 23 and a master cylinder on the steering handle 2 side. I have. A brake disk of the front wheel side disk brake 44 is indicated by reference numeral 44a in FIG.
A brake caliper is indicated by reference numeral 44b. The brake disc of the rear wheel side disc brake 45 is denoted by reference numeral 45 in FIG.
The brake caliper is indicated by reference numeral 45b in FIGS. 2 and 5. The brake discs 44a,
45a is attached to the front wheels 10 and the hubs 38 and 26 of the rear wheel 23, the front wheel caliper 44b is attached to the front fork 9, and the rear wheel caliper 45b is attached to the support bracket 22.

As shown in FIGS. 3 and 4, the hydraulic control device 36 has a structure in which a motor 46 and a rotary hydraulic pump 47 driven by the motor 46 are integrally combined. Two cross members made of a steel plate are provided at portions of the lower two down tubes 12 and 13 of the four down tubes 12 to 15 of the body frame 7 located below the footrest plate 4. 48,
49, two brackets 50 and 51, and cushion rubber 52 for elastic support.

The two brackets 50 and 51 are formed so as to extend in the front-rear direction of the vehicle body.
It is fixed by 3. These brackets 50,5
One of the brackets 50 on the left side of the vehicle body elastically supports the end of the hydraulic pump 47 on the left side of the vehicle body via two cushion rubbers 52. The bracket 51 on the right side of the vehicle body
The right end of the hydraulic pump 47 on the vehicle body is elastically supported via one cushion rubber 52.

The motor 46 and the hydraulic pump 47 are
It is disposed at the center in the vehicle width direction, and is positioned so that the axis is directed in the vehicle width direction. In FIG. 4, the reference numeral 54 provided on the side of the hydraulic pump is an igniter of the ignition device.

The hydraulic pump 47 has a conventionally well-known structure for applying a hydraulic pressure to the hydraulic system of the front wheel side disc brake 44 and the hydraulic system of the rear wheel side disk brake 45, respectively, and increases or decreases the hydraulic pressure of these hydraulic systems. (Not shown) is built-in. This solenoid valve is turned on and off by a control signal sent from the electronic control unit 33.
Is switched. This anti-lock brake device employs a configuration in which when the front wheel 10 or the rear wheel 23 is locked during braking, the solenoid valve is operated to temporarily decrease the hydraulic pressure of the hydraulic system and then increase the hydraulic pressure.

The hydraulic system of the front wheel side disc brake 44 and the hydraulic system of the rear wheel side disc brake 45
A brake pipe made of steel pipe (hereinafter simply referred to as a brake pipe) so that the oil pressure loss is reduced as much as possible between the master cylinder on the side and the hydraulic pump 47.
Is interposed. The hydraulic system of the front wheel-side disc brake 44 is supplied from a hydraulic pump 47 to a brake caliper 44.
A brake pipe made of steel pipe is also interposed in the middle until b. Here, the configuration of the hydraulic piping will be described in more detail.

As shown in FIG. 1, between the hydraulic pump 47 and the front wheel brake master cylinder (not shown) provided on the right side of the steering wheel 2 in the hydraulic system of the front wheel side disc brake 44, Brake hose 55 extending downward from the cylinder to near the lower end of head pipe 8
From the lower end of the brake hose 55 to the hydraulic pump 47.
And a brake hose 57 extending from the hydraulic pump 47 to the vicinity of the down tube 14 located on the upper left side of the vehicle body between the hydraulic pump 47 and the front wheel caliper 44b.
From the tip of the brake hose 57 to the head pipe 8
And a brake hose 59 extending from the front end of the brake pipe 58 to the brake caliper 44b.

On the other hand, between the rear wheel brake master cylinder 60 and the hydraulic pump 47 provided on the left side of the steering wheel 2 in the hydraulic system of the rear wheel side disc brake 45,
A brake hose 61 extending from the master cylinder 60 to the vicinity of the lower end of the head pipe 8 and a brake pipe 62 extending from the lower end of the brake hose 61 to the hydraulic pump 47 are formed by the hydraulic pump 47 and the rear wheel caliper 45b. The space is constituted by a brake hose 63.

The brake hoses 55, 57, 59, 6
Reference numerals 1 and 63 are made of rubber having high pressure resistance and high oil resistance. In this embodiment, the three brake pipes 56, 58, 62 described above are connected to the four down tubes 12
, The rear side of the vehicle body is fixed to the down tube 14 by a holder 64, and the front side of the vehicle body is a lower down tube 12. Are fixed by a holder 65.

Of these brake pipes, two brake pipes 5 on the input side directly connected to the hydraulic pump 47.
6 and 62, as shown in FIGS. 3 and 4, pipes extend in the vicinity of the hydraulic pump 47 so as to extend in parallel with the vehicle width direction. In this embodiment, a portion extending in the up-down direction is provided in the middle of a portion extending in the vehicle width direction. More specifically, these brake pipes 56, 62, first horizontal extending portions 56a, 62a extending to the left of the vehicle body from the hydraulic pump 47 to above the motor 46, and the first horizontal extending portions 56a, 62a. A vertically extending portion 56 extending upward from the tip of 62a to substantially the same height as the upper down tube 14;
b, 62b, second horizontal extending portions 56c, 62c extending to the left of the vehicle body from the upper ends of the vertical extending portions 56b, 62b to above the upper down tube 14, and the second horizontal extending portions. There are longitudinally extending portions 56d, 62d extending forward from the vehicle body from the distal ends of the existing portions 56c, 62c. The longitudinally extending portions 56d, 62d are fixed to the down tubes 14, 12 by the holders 64, 65. ing. By arranging the brake pipes 56 and 62 in this manner, three bent portions are formed in the brake pipes 56 and 62 near the hydraulic pump 47 at substantially right angles.

The anti-lock brake device constructed as described above is provided with a detecting portion 35a of the wheel speed sensor 35 on the rear wheel side.
The annular space 4 formed between the flange 39 of the transmission case body 21 and the bottomed cylinder 41 of the hub 26 of the rear wheel 23
0, and is opposed to the internal gear 42 on the hub 26 side, so that the detection unit 35a can be disposed outside the space for accommodating the gear type reduction gear inside the transmission case main body 21. Therefore, compared with the case where the detection unit 35a is opposed to the gear of the speed reducer, the seal member does not need to be interposed in the wheel speed sensor mounting portion, so that the number of parts is reduced and the mounting operation of the wheel speed sensor 35 is simplified. become.

Further, compared with the case where the detection unit 35a is opposed to the gear of the speed reducer, lubricating oil and iron powder generated from the speed reducer do not adhere to the detection unit 35a, so that the detection accuracy can be increased. it can. In addition, since the structure for detecting the internal gear 42 provided on the hub 26 is adopted, the internal gear 42 can be equipped using the space inside the rear wheel 23 in the radial direction. As a result, the travel distance per pulse can be relatively short without increasing the size of the vehicle body, in other words, the resolution can be increased, as compared with the case where the configuration for detecting the rotation of the speed reducer is employed.

An annular space 4 into which the detection section 35a is inserted.
In the case of No. 0, foreign substances are unlikely to enter because the outer peripheral portion is sealed to the outside by the labyrinth seal 43, and the detection accuracy can be kept high.

Further, since the detecting portion 35a of the wheel speed sensor 35 on the rear wheel side is formed in a rod shape and faces radially inward of the internal gear 42, the hub 2 of the rear wheel 23 is required for maintenance.
Even when the internal gear 42 comes into contact with the detection unit 35a when the wheel 6 is removed from the axle 27 to the right side of the vehicle body, the detection unit 35a bends by its own elasticity. Therefore, it is necessary to reduce the impact transmitted to the coil in the wheel speed sensor 35. Can be.

[0045]

As described above, according to the present invention, the detecting portion of the wheel speed sensor can be arranged outside the space for accommodating the gear type speed reducer inside the transmission case. For this reason, compared with the structure in which the detection unit is opposed to the gear of the speed reducer, the seal member does not need to be interposed in the wheel speed sensor mounting portion, so that the number of parts is reduced and the mounting operation of the wheel speed sensor is simplified. Become. In addition, since lubricating oil and iron powder generated from the reduction gear do not adhere to the detection unit of the wheel speed sensor, the detection accuracy is high.

Further, since the structure for detecting the internal gear provided on the hub of the rear wheel is employed, the internal gear can be provided by utilizing the space inside the rear wheel in the radial direction. As a result, the travel distance per pulse can be relatively shortened, that is, the resolution can be increased, without increasing the size of the rear end of the transmission case, as compared with the case where the rotation of the reduction gear is detected. .

Accordingly, it is possible to provide an anti-lock brake device for a scooter in which the detection accuracy and resolution of the wheel speed sensor for detecting the rotation of the rear wheel are high and the mounting structure of the wheel speed sensor is simple.

According to another invention in which a labyrinth seal is formed between the outer peripheral portion of the flange for mounting the wheel speed sensor and the opening edge of the cylinder facing this flange, the annular portion for inserting the detecting portion of the wheel speed sensor is provided. Since the outer peripheral portion of the space is sealed to the outside by a labyrinth seal, foreign matter is unlikely to enter. Therefore, the detection accuracy of the wheel speed sensor can be kept high.

According to another invention in which the detecting portion of the wheel speed sensor is formed in a rod shape and faces radially inward of the internal gear, the internal gear is connected to the detecting portion when the rear wheel is removed from the transmission case during maintenance. Even if it comes into contact, the detection unit bends by its own elasticity, and can reduce the impact. For this reason, the wheel speed sensor is not damaged even with a structure in which the detection unit faces the internal gear of the rear wheel that is frequently attached and detached for maintenance.

[Brief description of the drawings]

FIG. 1 is a side view of a scooter equipped with an antilock brake device according to the present invention.

FIG. 2 is a plan view showing a configuration of a vehicle body frame.

FIG. 3 is an enlarged plan view showing a hydraulic control device.

FIG. 4 is a perspective view showing a support structure of the hydraulic control device.

FIG. 5 is a sectional view taken along line VV of the hub portion of the rear wheel in FIG. 1;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Scooter, 4 ... Footrest board, 6 ... Unit swing type engine, 7 ... Body frame, 21 ... Transmission case main body,
26: hub, 27: axle, 35: wheel speed sensor, 35a
Detector, 36 Hydraulic controller, 39 Flange, 40
... annular space, 41 ... bottomed cylinder, 42 ... internal gear, 43 ...
Labyrinth seal.

Claims (3)

[Claims] An anti-lock brake device for a scooter for detecting rotation of a rear wheel supported by a unit swing type engine by a wheel speed sensor comprising an electromagnetic pickup, wherein the transmission case of the unit swing type engine has a rear wheel side. A flange is formed so as to be located on the same axis as the axle, and a bottomed cylinder that forms an annular space between the rear wheel hub and the flange is provided on a hub of the rear wheel. An anti-lock brake device for a scooter, which is mounted so as to be parallel to the axis of the scooter and provided with an internal gear detected by a detection unit of the wheel speed sensor on an inner peripheral portion of the bottomed cylinder. 2. The scooter anti-lock brake device according to claim 1, wherein a labyrinth seal is formed between an outer peripheral portion of the flange and an opening edge of a cylinder facing the flange. Anti-lock brake device. 3. The anti-lock brake device for a scooter according to claim 1, wherein the detection portion of the wheel speed sensor is formed in a rod shape and faces inward in the radial direction of the internal gear. Anti-lock brake device for scooter.