JPS6340076Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a brake device for a vehicle such as a motorcycle.

BACKGROUND ART Conventionally, a technique disclosed in, for example, Japanese Utility Model Application Publication No. 49-68148 has been proposed as a brake device for use in vehicles such as motorcycles.

As shown in FIGS. 1 and 2, this technology fixes a master cylinder 3 to a frame 2 near a fork pivot 1, and communicates the master cylinder 3 and a caliper 4 through a flexible hose 5. The flexible tube 5 is
It is laid loosely so as to extend vertically above the rear fork 6, with some extra length. However, when the flexible tube 5 is installed in this way, when the rear fork 6 swings, the flexible tube 5 swings upward significantly in response to this, and the bottom surface of the rear fender 7 and seat 8 It is necessary to secure an empty space between the rear fork 6 and the rear fork 6 to allow the deflection of the flexible tube 5 to escape. Therefore, the brake system with the above-mentioned configuration is not suitable for off-road models where the wheel stroke is large, the exhaust muffler is passed under the seat, and it is difficult to leave empty space above the rear forks. , it was difficult to apply.

The present invention was proposed based on the above background, and it can be used for off-road vehicles with large wheel strokes, which requires less upward deflection of the flexible tube that serves as the oil passage between the master cylinder and the caliper. The purpose is to provide a brake device that is easy to apply.

Hereinafter, the present invention will be explained based on FIGS. 3 to 7.

FIG. 3 is a side view of an off-road motorcycle to which an embodiment of the present invention is applied, in which 10 is a front wheel;
1 is a rear wheel, 12 is an engine, 13 is an exhaust muffler, 14 is a seat, 15 is a rear fender, 16 is pivoted to the vehicle body at one end so as to be freely rotatable in the vertical direction, and the rear wheel 11 is rotatable at the other end. A freely pivoted fork member (hereinafter referred to as rear fork),
Reference numeral 17 indicates a brake device of the present invention, and reference numeral 18 indicates a vehicle body frame, and a pivot portion (hereinafter referred to as fork pivot) that pivots the rear fork 16 to a center frame 18a forming a part of the vehicle body frame 18.
19 are provided.

Hereinafter, the brake device 17 of the present invention will be explained.

As shown in FIGS. 4 and 5, the brake device 17 of the present invention includes a brake pedal 20 pivotally supported by a center frame 18a at a position below the fork pivot 19,
A master cylinder 21 is fixed to the center frame 18a at an upper position and generates hydraulic pressure when the brake pedal 20 is operated, and an oil cup 22 is fixed to the center frame 18a at an upper position of the master cylinder 21 and supplies hydraulic oil to the master cylinder 21. , a brake disc 23 fixed to the wheel 11a of the rear wheel 11, a caliper bracket 24' supported coaxially with the rear wheel 11, and brake pads applied to the disc 23 by hydraulic pressure from the master cylinder 21. 24a
The caliper 24 that presses against the caliper 24
The torque rod 25 has one end pin-coupled to the center frame 18a and the other end pin-coupled to the center frame 18a, and an oil passage 26 for supplying hydraulic oil from the master cylinder 21 to the caliper 24.

The oil passage 26 has an intermediate portion inserted into the rear fork 16 having a cylindrical shape.
A first oil passage 26a that is open on the 9 side and whose other end is open on the caliper 24 side, and one end side of the first oil passage 26a and the master cylinder 21
and a third oil passage 26c that communicates the other end side of the first oil passage 26a with the hydraulic chamber of the caliper 24. A metal pipe (oil pipe) is used for the first oil passage 26a to improve strength, and the second and third oil passages 26b, 26
For c, a flexible oil pipe (flexible hose) is used which has a sufficient length so that it will not become tense even when the rear fork 16 or caliper 24 swings. The first oil passage 26a and the second oil passage 26b are connected via a pipe joint (oil pipe fixing means) 27.
A and the third oil passage 26c are connected through a pipe joint (oil pipe fixing means) 28.

A supplementary explanation of the pipe joints 27 and 28 will be given with reference to FIGS.
The second and third oil passages 26 are connected to the oil passage 26a of
b, 26c, rear fork 16
It is inserted into a hole drilled in the hole and fixed by welding so as to close the hole. As shown in FIG. 6, the pipe joint 27 connects a spectacle body 27a to which an oil pipe constituting a second oil passage 26b is connected, and a spectacle body 27a.
7a to the oil passage 29a of the pipe holding fitting 29, and an oil washer 27c for sealing the mating surfaces of the eyeglass body 27a and the pipe holding fitting 29, etc. As shown in FIG. 7, the pipe joint 28 has a cylindrical hose fitting 28a to which an oil pipe constituting the third oil passage 26c is connected at one end and screwed into the pipe holding fitting 29 at the other end. , an oil washer 27c that seals the mating surfaces of the hose fitting 28a and the pipe holding fitting 29, and the pipe holding fitting 29, which is common to both the pipe fittings 27 and 28, is an outer cylinder welded to the rear fork 16. 29b, a piece body 29c fitted into the outer cylinder 29b, and a pressing body 29d screwed to the lower end of the outer cylinder 29b. First oil passage 26a
The flanges at the end of the pipe are clamped, and an oil pipe constituting an oil passage 26a is connected to the pipe holding fitting 29.

The oil passage 26 when the rear fork 16 swings will be described below with reference to FIG. 4.

As shown by arrows a and b in FIG. The oil passage 26b and the third oil passage 26c expand and contract, whereby the oil passage 26
Runout occurs at b and 26c. However, these oil passages 26b and 26c are both shorter in length than the oil passages in a conventional brake device (see FIG. 1), which is formed by laying a flexible tube along the rear fork 16. Therefore, only a small amount of vibration occurs compared to the conventional one. Therefore, in order to prevent the deflection of the flexible tube, the rear fork 16
Only a small empty space can be secured between the rear fender 15 and the rear fender 15, etc., and even in off-road vehicles, etc., where the wheel stroke is large and requires a large empty space for the stroke, there is no inconvenience. do not have. Further, most of the oil passage 26 (the first oil passage 26a) is hidden inside the rear fork 16. The appearance becomes smarter, and the risk of obstacles or the like interfering with the oil passage 26 while driving is reduced. In addition, if a metal pipe is used for the oil passage 26a passing through the rear fork 16 as in the above-mentioned embodiment, pressure transmission can be performed efficiently as the elastic deformation of the oil passage is small.
Although the brake performance is improved, the material of the oil passage 26a is not limited to the metal pipe described above, and it is also possible to use a flexible pipe like the other oil passages 26b and 26c.

As explained above, the brake device of the present invention connects the oil passage from the master cylinder near the pivot that pivotally supports one end of the fork member to the caliper on the brake disc pivotally supported on the other end of the fork member. Since the oil passage is inserted into the fork member, the length of the oil passage that is exposed outside the fork member and expands and contracts in response to the swinging of the fork member can be shortened, so that the oil passage does not swing upward when the fork member swings. becomes smaller, making it easier to apply to off-road vehicles and the like where the stroke of the wheel pivotally supported at the other end of the fork member is large. The oil pipe constituting the oil passage is not only inserted through the fork member, but also fixed with a fixing means attached to an opening in the fork member, so that when the brake is applied or the fork member swings, The oil passage pipe can be prevented from moving in the length direction and come into sliding contact with the opening of the fork member, and wear and tear on the oil passage pipe can be prevented.

Furthermore, since the opening in the fork member is closed by the oil pipe fixing means, it is also possible to prevent foreign matter from entering the inside of the hollow fork member.

Furthermore, the exposed part of the oil pipe can be made as short as possible.
The amount of coating provided around the outer periphery of the oil pipe to prevent obstacles from directly hitting the oil pipe can also be reduced, and the appearance can be improved.

[Brief explanation of drawings]

Figures 1 and 2 show a conventional brake device, where Figure 1 is a side view, Figure 2 is a view taken along the - line in Figure 1, and Figure 3 is an embodiment of the present invention. Figure 4 is a side view of a motorcycle to which this is applied.
FIG. 5 is an enlarged view of the main part of the figure, FIG. 5 is a view taken from the direction of arrow V in FIG. 4, and FIGS. 6 and 7 are detailed views of portions A and B in FIG. 4, respectively. 11... Rear wheel, 13... Exhaust muffler, 15... Rear fender, 16... Fork member (rear fork), 17... Brake device,
18a... Center frame, 19... Fork pivot, 20... Brake pedal,
21... Master cylinder, 22... Oil cup, 23... Brake disc, 24'... Caliper bracket, 24... Caliper, 25
...Torque rod, 26...Oil passage, 26a...
First oil passage, 26b...Second oil passage, 26c
...Third oil passage, 27, 28...Pipe joint (oil pipe fixing means).

Claims (1)

[Scope of utility model registration request] One end is pivoted to the vehicle body so that it can rotate freely in the vertical direction,
A cylindrical fork member having a wheel rotatably supported at the other end, a master cylinder fixed to the vehicle body near the vehicle body side pivot portion, and a caliper provided on a brake disc provided on the wheel. In a vehicle equipped with this, the oil passage extending from the master cylinder enters the inside of the fork member through an opening provided near the pivot on one end of the fork member, and enters the interior of the fork member through an opening provided near the caliper on the other end of the fork member. The fork member exits from the hole and its tip is connected to the caliper, and oil pipe fixing means are respectively fixed to the openings of the fork member so as to close the openings, and the oil pipe fixing means A brake device for a vehicle, characterized in that a portion of the oil pipe constituting the oil passage arranged outside the rear fork is fixed to the rear fork with a margin in the length direction.