JPH11189189A - Parking brake device for motorcycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a parking brake device for a motorcycle, which is capable of reducing the number of part items and simplifying a structure by providing an existing hydraulic brake device with a parking brake function. SOLUTION: A parking brake device provided in the vicinity of the brake lever 29 of a motorcycle having a disk brake device (hydraulic brake device) actuated by an oil pressure (liquid pressure) generated by the rotation of the brake lever 29 to generate a braking force is composed of a cylinder slid roughly in the rotational direction of the brake lever 29, a piston 52, the end part of which being fitted freely slidable in the cylinder, extended out of the cylinder and brought into contact the end surface 29a of the brake lever 29, a spring 54 contracted in the cylinder for energizing the piston 52 toward the brake lever 29, and a releasing lever (fixing/releasing) 55 for fixing/releasing fixing of the cylinder.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parking brake device for a motorcycle including a hydraulic brake device which operates by receiving a hydraulic pressure generated by a rotation operation of a brake lever to generate a braking force.

[0002]

2. Description of the Related Art In a motorcycle equipped with a hydraulic brake device, for example, a master cylinder is operated by a turning operation force of a brake lever provided on a steering wheel to generate a hydraulic pressure, and the brake device is operated by the hydraulic pressure and required. Is obtained.

[0003] By the way, it has hitherto been impossible to provide a parking brake function to such a hydraulic brake device. That is, even if the brake lever is fixed to the operating position and the hydraulic brake device is maintained in the operating state, the braking force gradually decreases due to the fluctuation of the hydraulic pressure due to the passage of time or a change in temperature. There was a problem that the braking function could not be obtained.

Therefore, conventionally, a mechanical parking mechanism had to be provided separately from the hydraulic brake device.

[0005]

However, if a mechanical parking mechanism is provided separately from the hydraulic brake device as in the prior art, the number of parts increases and the structure becomes complicated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to provide a parking brake function to an existing hydraulic brake device to reduce the number of parts and simplify the structure. An object of the present invention is to provide a parking brake device for a motorcycle.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a motorcycle having a hydraulic brake device which operates in response to a hydraulic pressure generated by rotating a brake lever to generate a braking force. A parking brake device provided in the vicinity of the brake lever is provided with a cylinder that slides in a substantially rotating direction of the brake lever, and an end that is slidably fitted in the cylinder and extends outside the cylinder. A piston abutting against the end face of the brake lever, a biasing means compressed in the cylinder to bias the piston toward the brake lever, and a fixing / releasing means for fixing and releasing the cylinder. It is characterized by.

Therefore, according to the present invention, if the brake lever is operated at the time of parking of the motorcycle and the cylinder is pushed into the brake lever side and is fixed by the fixing / releasing means, the piston fitted into the cylinder is provided. The end of the brake lever contacts the end face of the brake lever and the spring that biases the piston contracts, so that the brake lever is in a position where the biasing force of the spring and the force that attempts to return the brake lever to the original position by hydraulic pressure are balanced. Held, whereby the hydraulic brake device performs the parking brake function. Then, when the liquid expands or contracts due to the passage of time or a change in temperature, the brake lever rotates and the spring expands and contracts accordingly, and even in this state, the brake lever is attached to the spring via the piston. Since the force is held at a position where the forces are balanced by receiving the force, a decrease in the hydraulic pressure is prevented, and the hydraulic brake device can stably perform the parking brake function. That is, while the expansion or contraction of the liquid is absorbed by the expansion and contraction of the spring (sliding of the piston), the hydraulic pressure is kept substantially constant, so that the parking brake function of the hydraulic brake device is not impaired.

According to the present invention, as described above, the existing hydraulic brake device also functions as a parking brake, so that a mechanical parking mechanism conventionally provided is unnecessary, so that the number of parts is reduced and the structure is simplified. Can be achieved.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a side view of a scooter-type motorcycle, FIG. 2 is a plan view of a brake lever portion of the scooter-type motorcycle, and FIGS. 3 to 5 are cross sections showing the structure and operation of a parking brake device according to the present invention. FIG.

In the scooter type motorcycle 1 shown in FIG. 1, a head pipe 2 is located at an upper front part of the vehicle body, and a steering shaft 3 is rotatably inserted into the head pipe 2. A steering wheel 4 is attached to an upper end of the steering shaft 3, and a front fork 5 is attached to a lower end of the steering shaft 3. A front wheel 6 is attached to a lower end of the front fork 5. It is rotatably supported by. A brake disk 8 of a hydraulically operated disk brake device is attached to the hub of the front wheel 6.

From above and below the head pipe 2, a main pipe 9 and a down tube 10 extend obliquely downward toward the rear of the vehicle body, and are bent to extend obliquely upward toward the rear of the vehicle body. The ends are connected by lugs 11. A seat rail frame 12 extends from the lug 11 toward the rear of the vehicle body.

On the other hand, reference numeral 13 denotes a tandem-type seat disposed behind the handle 4, and a unit swing type engine 14 as a power unit is provided below the seat 13. This unit swing type engine 14
Is constituted by integrating an engine 15 as a drive source and a transmission case 16 including a V-belt type automatic transmission and a power transmission mechanism (not shown). A rear wheel 17 is rotatably supported by a rear axle 18 at the rear end.
The hub of the rear wheel 17 is provided with a brake disk 19 of a hydraulically operated disk brake device.

The unit swing type engine 14
The lug 1 has a front upper portion via a link member 20.
1 is swingably supported by the rear wheel 1
7 together with the seat rail frame 12 via a rear cushion 21.

In FIG. 1, reference numeral 22 denotes a fuel tank;
Reference numeral 3 denotes a rear carrier, 24 denotes a backrest, and the periphery of the vehicle body is covered by a resin body cover 25.

Incidentally, in the scooter type motorcycle 1 according to the present embodiment, the front wheel 6 and the rear wheel 1
7, a hydraulic disc brake device is employed as the braking means. This disc brake device is composed of the brake discs 8, 19 mounted on the end faces of the hubs of the front wheel 6 and the rear wheel 17, and the brake discs 8, 19, A brake caliper (not shown) sandwiching 19 with a brake pad (not shown) is included.

Although not shown, each brake caliper has a cylinder, a piston slidably fitted in the cylinder, and the pistons pressed by the brake discs 8 and 19 by the pistons. , 19 are provided from both sides, and a hydraulic hose is connected to the brake caliper.

On the other hand, in FIG. 2, reference numeral 26 denotes a handle pipe of the handle 4, and a grip 27 is attached to an end thereof (only the left end is shown in FIG. 2).
A holder 28 is fitted to a portion of the handle pipe 26 near the grip 27, and a base end of a rear wheel brake lever 29 is rotatably pivoted to the holder 28 by a bolt 30. . In addition, brake lever 2
A stopper bolt 31 for regulating the rotation angle of the brake lever 29 is screwed to the base of the base 9 in an adjustable manner.

Thus, if the rider grips the brake lever 29 and turns it around the bolt 30,
A predetermined hydraulic pressure is generated by operating a master cylinder (not shown), and this hydraulic pressure is transmitted to a brake caliper via a hydraulic hose, and a piston in the brake caliper operates to move a brake pad to a brake disk 19 (see FIG. 1). , The brake disk 19 is sandwiched between the brake pads, and a required braking force is obtained by the frictional force generated between the two.

A parking brake device 50 according to the present invention is provided at the tip of the holder 28. Here, the configuration of the parking brake device 50 will be described in detail with reference to FIG.

As shown in FIG. 3, a circular hole 28a is formed in the distal end portion of the holder 28 in a lateral direction, and a cylinder 51 is laterally inserted in the circular hole 28a (substantially turning the brake lever 29). (Moving direction). A piston 52 is slidably fitted in the cylinder 51, and a rod portion 52 a of the piston 52 protruding outside the cylinder 51 is connected to the end surface 2 of the brake lever 29.
9a.

The open end face of the cylinder 51 is closed by a plate-shaped cap 53, and the pin ton is connected to a spring 54 compressed in the cylinder 51.
Thus, it is constantly biased in the direction of the brake lever 29. Note that a part of the outer peripheral surface of the cylinder 51 is provided with an engagement groove 51a.
Are formed.

On the other hand, a notch 2
8b, a release lever 55 constituting a fixing and releasing means for fixing and releasing the fixing of the cylinder 51 is provided in the notch portion 28b so that an intermediate portion thereof is rotatably supported by a pin 56. Have been. At one end of the release lever 55, an engagement claw 55a is formed to selectively engage with the engagement groove 51a formed at the cylinder 51. At the other end of the release lever 55, an operation knob 55b is provided. Are formed.

Next, the operation of the parking brake device 50 according to the present invention will be described.

When the scooter-type motorcycle 1 is not parked, the parking brake device 50 is in a non-operating state as shown in FIG. 3. At this time, the engaging claw 55a of the release lever 55 engages with the cylinder 51. Not engaged with the mating groove 51a, the cylinder 51 is in a free state, and the spring 54 is in a most extended state. In this state, the brake lever 29 is freely rotated by the parking brake device 50 without any restrictions, and a required braking force is obtained, so that the scooter type motorcycle 1 is decelerated or stopped.

When the scooter-type motorcycle 1 is parked, the brake lever 29 is operated, and at the same time, the cylinder 31 of the parking brake device 50 is pushed toward the brake lever 29 (in the direction of the arrow in FIG. 3). By sliding along the circular hole 28a, the engagement groove 5 formed on the outer peripheral surface of the cylinder 51 is formed as shown in FIG.
The engagement claw 55a of the release lever 55 is engaged with 1a, and the cylinder 51 is fixed to the holder 28. In this state, the end of the rod portion 52a of the piston 52 fitted in the cylinder 51 comes into contact with the end surface of the brake lever 29, and the spring 54 for urging the piston 52 contracts. The biasing force of the spring 54 and the force for returning the brake lever 29 by hydraulic pressure are held at a position where the force is balanced, whereby the disc brake device performs a parking brake function.

When the oil expands or contracts due to the lapse of time or a change in temperature thereafter, the brake lever 29 rotates in response to the expansion or contraction, and the spring 54 expands and contracts.
Even in this state, the brake lever 29 can be
, The spring 54 is held at a position where the force is balanced by receiving the urging force of the spring 54, so that a decrease in oil pressure is prevented and the disc brake device can stably perform the parking brake function. That is, the expansion or contraction of the oil is absorbed by the expansion and contraction of the spring 54 (sliding of the piston 52) and the hydraulic pressure is kept substantially constant, so that the parking brake function of the disc brake device is not impaired.

For example, when the oil contracts due to a decrease in temperature, the brake lever 29 is turned around the bolt 30 in the counterclockwise direction in FIG. 5 by the piston 52 urged by the spring 54 as shown in FIG. As a result, a decrease in hydraulic pressure is prevented, and the parking brake function of the disc brake device is maintained.

Further, according to the present embodiment, as described above, the existing disk brake device also performs a parking brake function, so that the mechanical parking mechanism conventionally provided is unnecessary, and the number of parts is reduced and the structure is reduced. Simplification is achieved.

In the above description, the parking brake function is particularly provided to the rear wheel disc brake device. However, the parking brake function can be similarly provided to the front wheel disc brake device.
Although the parking brake device provided on the scooter-type motorcycle has been described above, the present invention is naturally applicable to the parking brake device of any other motorcycle.

[0032]

As is apparent from the above description, according to the present invention, a motorcycle provided with a hydraulic brake device which operates by receiving a hydraulic pressure generated by a turning operation of a brake lever to generate a braking force. A parking brake device provided in the vicinity of the brake lever is provided with a cylinder that slides in a substantially rotating direction of the brake lever, and an end that is slidably fitted in the cylinder and extends outside the cylinder. Because it includes a piston abutting on the end face of the brake lever, a biasing means compressed in the cylinder to bias the piston toward the brake lever, and a fixing / releasing means for fixing and releasing the cylinder, By providing a parking brake function to the existing hydraulic brake, the number of parts can be reduced and the structure can be simplified.

[Brief description of the drawings]

FIG. 1 is a side view of a scooter type motorcycle.

FIG. 2 is a plan view of a brake lever portion of the scooter type motorcycle.

FIG. 3 is a cross-sectional view showing the configuration and operation of the parking brake device according to the present invention.

FIG. 4 is a sectional view showing the configuration and operation of a parking brake device according to the present invention.

FIG. 5 is a sectional view showing the configuration and operation of a parking brake device according to the present invention.

[Explanation of symbols]

 Reference Signs List 1 scooter type motorcycle (motorcycle) 29 brake lever 50 parking brake device 51 cylinder 52 piston 54 spring 55 release lever (fixing / release means)

Claims (1)

[Claims] 1. A device provided near a brake lever of a motorcycle including a hydraulic brake device that operates by receiving a hydraulic pressure generated by a rotation operation of a brake lever to generate a braking force, A cylinder that slides in a substantially rotating direction of the brake lever, a piston that is slidably fitted in the cylinder and that has an end extending outside the cylinder and abutting against the end surface of the brake lever; A parking brake device for a motorcycle, comprising: a spring mounted to bias the piston in a brake lever direction; and fixing / releasing means for fixing / releasing the cylinder.