JPS60169391A - Hydraulic type foot grake gear for saddling type car - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a hydraulic foot brake device for a saddle type vehicle such as a motorcycle or a tricycle.

(Prior art) In this type of conventional hydraulic foot brake device, a piston rod is slidably inserted into one end of a mask cylinder body fixed to a frame, and the one end side of the piston rod is pressed by a lever of a brake pedal. The pressure oil generated in the mask cylinder body is guided to the wheel cylinder, but normally the brake pedal is directly supported on the frame separately from the mask cylinder, and the length is adjusted by the lever of this brake pedal. Pushing the piston rod through possible links. Therefore, there are many places to attach it to the car body, and it is necessary to adjust the play of the brake pedal later, so it takes time and effort to install, remove, and adjust.
The number of parts increased, and the appearance was complicated and unsightly. The technology of Japanese Utility Model Application Publication No. 51-166252 which improved this is as follows:
The mask cylinder and brake pedal are assembled on a board and attached to the frame via a rubber cushion, which reduces the effort required to attach, remove, and adjust the foot brake device to the vehicle body, but increases the number of parts. The exterior was complicated and unsightly, and required installation space.

(Object of the Invention) The present invention solves the above-mentioned problems by directly supporting the brake pedal on the mask cylinder body, which not only reduces the effort required for installation, removal, and adjustment to the vehicle body, but also reduces the number of parts. The objective is to obtain a hydraulic foot brake that is compact in appearance.

(Structure of the Invention) In order to achieve the above object, the present invention provides a hydraulic foot brake device of this type, in which a support shaft attachment portion is integrally formed in the front portion of the one end of the mask cylinder body, and the support shaft attachment portion is integrally formed in the front portion of the one end of the mask cylinder body. a rear part of the brake pedal is pivotally supported by a support shaft provided in the part;
It is characterized in that the piston rod is pressed through a bushoche rod which is provided on the lever provided at the rear portion and whose position is freely adjustable in the longitudinal direction.

(Effects of the Invention) The present invention having the above configuration allows the mask cylinder and the brake pedal to be adjusted in advance as one assembly, which not only reduces the effort of mounting, removing, and adjusting the brake pedal on the vehicle body, but also allows the mask cylinder and brake pedal to be directly attached to the mask cylinder body. Because the brake pedal is pivoted, there are fewer parts, which reduces manufacturing costs.
The appearance is compact and neatly organized.

(Embodiment) FIGS. 1 and 2 show an embodiment of the present invention in a motorcycle, and show a mask cylinder 20 of a hydraulic foot brake.
The rear end of the brake pedal 30 is pivotally supported via a support shaft 31 at the front lower support shaft mounting portion 21c, and the mask cylinder 20 and brake pedal 30 are attached to the frame 10 in a sub-assembled state. Installation and removal are performed.

The frame 10 of the embodiment shows the vicinity of the footrest attachment part of a double cradle frame of a motorcycle, and a pivot bearing part 10a that pivotally supports the front end of a rear swing arm (not shown) is connected to a head pipe via a tank rail. The upper pipe 10b, the lower vibe 10c connected to the hend pipe via the down tube, and the seat rail 10d supporting the seat rail are welded. A bracket 1 is provided on the rear side of the pivot bearing part 10a and the G-tostee 10d.
0e is welded, and the footrest 12 is attached to the lower pipe 10c.
to be fixed. The support bracket 11 is a mask cylinder 20
It also supports the muffler 13, tandem footrest (not shown), etc., and is fixed to the bracket 10e of the frame 10 with mounting bolts 26 and 27.

The main part of the mask cylinder 20 is the mask cylinder, and the body 2
L Consists of a piston rod 22, a piston cup 23, a return spring 24, and a joint 25, and a mounting bolt 27.
28 to the right support bracket 11. The mask cylinder body 21 has an elongated shape and is
d and the lower vibe 10C, and is provided with a cylindrical hole 21a whose front lower end is open along the longitudinal direction, and the piston cup 23 and piston rod 22 are slidably fitted from the front lower end of this cylindrical hole 21a. Insert. A return spring 24 is provided between the piston cup 23 and the bottom of the cylindrical hole 21a, and a banjo connector 43 and a banjo port 44 are provided at the bottom to send pressure oil in the cylinder chamber 2Ib to a rear wheel cylinder (not shown). Connect one end of the brake pipe 42. A reservoir tank 40 is connected to an example of the mask cylinder main body 21 via a joint 25 and a supply pipe 41, and brake oil in this tank 40 is supplied to the mask cylinder 20. The reservoir tank 40 is attached to the lower part of the seat (none of which is shown) of the frame 10 via an elastic support member such as rubber.

As shown in FIGS. 1 and 2, the mask cylinder body 21
A trident-shaped support shaft mounting portion 2Ic is integrally formed at the front portion of the lower front end of the support shaft. The rear part 30a of the brake pedal 30 has both sides made slightly narrower, and a bearing bush 32 is fixed thereto. The support shaft mounting portion 21C holds the rear part 30a in between, inserts the lateral support shaft 31, which is provided offset forward and upward from the axis of the cylindrical hole 21a, into the bearing bush 32, and attaches the brake pedal 30 to the rear part 30a. It is rotatably supported by the mask cylinder body 21. A bushing rod 33 is screwed into the lever 30b which protrudes rearward from the rear part 30a of the brake pedal 30 in a direction perpendicular to the lever 30b so as to be freely articulated in its longitudinal direction, and is fixed with a lock nut 34. The spherical portion 33a at the tip of the bushing rod 33 is brought into contact with the lower front end of the piston rod 22 within its trifurcated portion 22a. The longitudinal position of the bushing rod 33 with respect to the lever 30b is
Before attaching the subassembly of the mask cylinder 20 and brake pedal 30 to the frame 10 via the support bracket 11, make adjustments in advance so that once the subassembly is attached to the frame 10, the brake pedal 30 will become part of the footrest 12. 12a and is positioned, and in this state, the return spring 24 is slightly bent so that the piston rod 22 takes a predetermined initial position.

In operation, when the tip of the brake pedal 30 is depressed, the brake pedal 30 rotates to the right around the support shaft 31 from the state shown in FIG. Press and displace. As a result, the piston cup 23 is also displaced, increasing the oil pressure in the cylinder chamber 21b, and the generated pressure oil is sent to the rear wheel cylinder through the brake pipe 42, thereby operating the rear brake. When the brake pedal 30 is released, the return spring 24 causes the re-piston rod 22 and the piston cup 23 to return to the state shown in FIG.

In the above embodiment, the mask cylinder 20 is provided inclined along the jet stick 10d, but this angle of inclination may be changed depending on the applicable model, etc. In that case, the longitudinal position of the bush rod 33 It is sufficient to adjust the brake pedal 30 to a desired angle. Furthermore, although the above embodiments have been described for a motorcycle with a double cradle frame, the present invention can also be implemented on motorcycles with other types of frames as long as they are saddle-ride type vehicles equipped with a hydraulic foot brake device. Moreover, it can also be implemented in the same way for tricycles and four-wheeled vehicles.

(Effects of Example) In the above example, the rear part 30a of the brake pedal 30 is pivotally supported by the three-pronged support shaft attachment part 21C at the front of the lower front end of the mask cylinder body 21, and the rear part 30a of the brake pedal 30 is supported via the bushing rod 33 screwed onto the lever 30b. and pressed the piston rod 22,
The number of parts can be reduced by eliminating the need for extra parts, and after adjusting the mask cylinder 20 and the brake pedal 30 as one subassembly, they can be attached to the frame 10 all at once.
Since it is removable, it is possible to reduce costs by reducing the labor involved in manufacturing, installing, and adjusting parts. Also, even if the mounting angle of the mask cylinder 20 changes, the bushing rod 3
Since the brake pedal 30 can be set to the desired angle by adjusting the brake pedal 30, this subassembly can be commonly used for many models by simply changing the adjustment.
Since the interlocking device between 0 and the brake pedal 30 is not exposed to the outside, the external appearance can be kept compact and neat.

Note that if the reservoir tank 40 is separated from the mask cylinder 20 and supported under the seat via an elastic member such as rubber as in the embodiment, foaming of the brake oil caused by engine vibration etc. can be prevented and the cylinder It is possible to avoid air bubbles from entering the chamber 21b, and to remove the obstructive reservoir tank near the driver's feet, increasing the degree of freedom in the arrangement of the mask cylinder 30.

[Brief explanation of drawings]

1 and 2 show one embodiment of the present invention, FIG. 1 is a partial side view of the vicinity of the footrest of a motorcycle in which the present invention is implemented, and FIG. 2 is a sectional view taken along line nn in FIG. 1. be. Explanation of symbols 10...Frame, 21...Mask cylinder body 1
．． 21C... Support shaft mounting part, 22... Piston rod, 30... Brake pedal, 30a... Rear, 30
b... Lever, 31... Support shaft, 32... Bush rod.

Claims (1)

[Claims] A piston rod is slidably inserted into one end of the mask cylinder body fixed to the frame, and the one end side of the piston rod is pressed by the lever of the brake pedal to guide the pressure oil generated inside the mask cylinder body to the wheel cylinder. In a hydraulic foot brake device for a straddle-type vehicle such as a motorcycle or a tricycle, a support shaft mounting portion is integrally formed in the front portion of the one end of the mask cylinder body, and a support shaft mounting portion is provided on the support shaft mounting portion. A hydraulic foot brake device, characterized in that the rear part of the brake pedal is pivotally supported by a support shaft, and the piston rod is pressed through a bushing rod provided on the lever provided at the rear part so as to be freely adjustable in position in a longitudinal direction.