JP3306916B2 - Front wheel brake piping system for motorcycles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front wheel brake piping system for a motorcycle.

[0002]

2. Description of the Related Art Hydraulic brake piping in a motorcycle mainly equipped with an inverted front fork and having a disk brake device on the left and right sides of a front wheel requires a single brake hose from a master cylinder to a front fork under bracket. Guide to the mounted joint, branch from this joint to two brake hoses, and lead each brake hose to the calipers of the left and right disc brake devices, or to the left and right calipers with two brake hoses from the master cylinder. (Japanese Unexamined Patent Publication No.
No. 49549, JP-A-62-152959).

[0003]

In the conventional front-wheel brake piping structure, two brake hoses expand and contract as the front fork expands and contracts during running of the vehicle, so that it is difficult to avoid interference with other parts. There is a problem that the components are easily damaged, and a problem is also imposed on the layout of other components.

The present invention has been made in consideration of the above-described circumstances, and has a single brake hose extending from a master cylinder to reduce the chance of interference with other components to prevent the brake hose from being damaged and to prevent other components from being damaged. It is an object of the present invention to provide a front-wheel brake piping device for a two-wheeled vehicle which can increase the degree of freedom of layout of the vehicle, reduce the number of parts and the number of assembly steps by eliminating the need for a joint at a brake hose branch, and reduce costs. I do.

[0005]

Means for Solving the Problems To solve the above problems, a front wheel brake piping device for a two-wheeled vehicle according to the present invention comprises:
Disc brake devices are provided on both left and right sides of a front wheel pivotally supported at the lower part of the front fork, and calipers of the respective disc brake devices are respectively mounted on the rear side of the front fork. A first brake hose connects the caliper of one of the disc brake devices and a caliper of the other disc brake device, and a second brake hose connects the caliper to the other caliper. The upper part is hung down along the front side of the front fork, the middle part is traversed from the front to the back side of the front fork, and the lower part is connected to one caliper, while the second brake hose is connected to the first brake Connect the second brake hose together with the hose to one of the calipers. From the rear of over scan by way of the rear outer surface of and the front fender is extended upwardly, characterized in that connected to the other of the caliper.

[0006]

The hydraulic pressure generated from the master cylinder during braking is guided to the caliper of one disk brake device through the first brake hose, and from this caliper to the caliper of the other disk brake device through the second brake hose. The left and right calipers are activated simultaneously, and the left and right discs are braked.

[0007] Since the master cylinder and one of the calipers are connected by one first brake hose, even if the first brake hose expands and contracts with the expansion and contraction of the front fork during traveling of the vehicle, the first brake hose is connected to other parts. Interference can be avoided. Further, since the second brake hose is located outside the range of expansion and contraction of the first brake hose, it does not interfere with the first brake hose.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

FIG. 1 shows a side view of a two-wheeled vehicle to which the present invention is applied. As shown in FIG.
A front wheel 5 is pivotally supported at a lower portion of the front fork 4, and disk brake devices 6 are provided on both left and right sides of the front wheel 5.

The disc brake device 6 comprises a disc 8 fixed to an axle 7, and a caliper 9 for applying a brake by pressing the disc 8 by hydraulic pressure. Each caliper is attached to the rear side of the front fork 4 via a bracket. In addition, a dash (') is added to the code for the disc brake device on the opposite side.
Are distinguished by adding.

In FIG. 1, the master cylinder 1 is operated by a brake lever 10 which is shown separately for convenience.
One is connected to one brake hose 12, which is a first brake hose. The brake hose 12 is guided downward along the front fork 4, is supported by a holder 14 mounted on the under bracket 13 on the way, and is connected to the caliper 9 of the disk brake device 6 on one side. The brake hose 12 is arranged such that its upper part hangs down along the front side of the front fork 4, its middle part crosses the inside of the front fork 4 from front to rear, and its lower part is connected to the caliper 9.

Further, the caliper 9 and the caliper 9 'of the other disc brake device 6' are connected by a brake hose 15, which is a second brake hose. The brake hose 15 extends from the caliper 9 and extends along the rear outer surface of the front fender 16 and is guided to the opposite side, and is connected to the other caliper 9 '. As shown in FIG. 5, the brake hose 15 is fixed to the front fender 16 by passing the brake hose 15 through a loop 18a of a brake hose fixture 18 fixed to the front fender 16 with bolts 17.

[0013] Brake hose 1 to one caliper 9
As shown in the cross-section in FIG. 6, the connection portions 2 and 15 are such that the ring portions 19a and 20a at the ends of the brake hose bases 19 and 20 fitted to the ends of the brake hoses 12 and 15 are screwed into the caliper 9. And is fastened to the upper and lower surfaces of each of the ring portions 19a, 20a via metal washers 22, 22, 22 together.

The union bolt 21 is provided with a circumferential groove 2 on the outer periphery at a position facing the oil passages 23 and 24 which are opened on the inner periphery of the ring portions 19a and 20a of the brake hose bases 19 and 20.
5 and 26 are formed, and a vertical hole 27 formed in the axial direction from the circumferential grooves 25 and 26 and the tip of the union bolt 21.
Are connected by side holes 28 and 29. As a result, the two brake hoses 12 and 15 communicate with each other through the brake hose bases 19 and 20, the horizontal holes 28 and 29, and the vertical holes 27. The two brake hoses 12 and 15 are held at positions near the union bolt 21 by the holding portions 30 of the positioning member 30.
a, 30b and fixed to each other.

As described above, the second brake hose 15 is connected to the first brake hose 12 by the union bolt 21.
At the same time, it is connected to one caliper 9 together, extends upward from the rear of the brake hose 12, and is connected to the other caliper 9 'via the rear outer surface of the front fender.

When the hydraulic pressure is generated by operating the master cylinder 11 by operating the brake lever 10, the hydraulic pressure reaches the union bolt 21 through the brake hose 12, the brake hose base 19, the circumferential groove 25, and the side hole 2.
8, acting on the caliper 9 through the vertical hole 27, the caliper 9 is actuated, the disk 8 is pressed and the brake is applied. At the same time, a part of the hydraulic pressure is changed from the vertical hole 27 to the horizontal hole 29, the circumferential groove 26,
Another brake hose 15 through the brake hose base 20
And acts on the caliper 9 'on the other side, and the caliper 9' operates to clamp the disk 8 'and apply the brake.

[0017]

As described above, according to the present invention, only one first brake hose extends from the master cylinder to the caliper, and the upper portion of the first brake hose extends along the front side of the front fork. The middle part crosses the side of the front fork from front to back,
Since the lower part is connected to one caliper, even if the first brake hose expands and contracts with the expansion and contraction of the front fork,
Piping can be easily performed so that the first brake hose does not interfere with other parts and is not damaged, and the layout of other parts is less restricted.

The second brake hose is piped along the rear outer surface of the front fender and is connected to the other caliper, so that it is stable and does not expand and contract during traveling, so that it does not interfere with other parts. Also, there is no possibility that the second brake hose is damaged.

Further, since the second brake hose extends upward from the rear portion of the first brake hose, it is completely located outside the range of expansion and contraction of the first brake hose, and interferes with the first brake hose. In this respect, damage to the first and second brake hoses can also be prevented.

Further, since it is not necessary to branch the brake hose into two parts on the way, parts such as joints are not required, so that the number of parts and the number of assembling steps are reduced, and the second brake hose can be formed very short. Therefore, the cost can be kept low.

[Brief description of the drawings]

FIG. 1 is a side view showing an example of a motorcycle embodying the present invention.

FIG. 2 is an external view showing an embodiment of a front wheel brake piping device for a two-wheeled vehicle according to the present invention.

FIG. 3 is a view taken in the direction of arrow A in FIG. 2;

FIG. 4 is a rear view of FIG. 2;

FIG. 5 is a sectional view of a fixing portion between the front fender and the brake hose.

FIG. 6 is a sectional view showing an example of a connection structure between a brake hose and a caliper.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body frame 4 Front fork 5 Front wheel 6,6 'Disc brake device 8,8' Disk 9,9 'Caliper 11 Master cylinder 12 First brake hose 15 Second brake hose 16 Front fender 19,20 Brake hose base 21 Union bolt

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-58-211984 (JP, A) JP-A-58-211983 (JP, A) JP-A-56-95781 (JP, A) 305892 (JP, A) Fully open 58-163385 (JP, U) Fully open 58-85583 (JP, U) Fully open 59-105590 (JP, U) Fully open 60-168686 (JP, U) Shokai 61-182389 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B62L 3/00-3/02

Claims (1)

(57) [Claims] 1. A two-wheeled vehicle in which disc brake devices are provided on both left and right sides of a front wheel pivotally supported by a lower portion of a front fork, and calipers of each disc brake device are respectively attached to a rear side of the front fork.
A first brake hose connects between the master cylinder and the calipers of one of the left and right disc brake devices, and a second brake hose connects between the one caliper and the other caliper. One of the brake hoses has its upper part suspended along the front side of the front fork, the middle part traverses the side of the front fork from front to back, and the lower part is connected to one caliper, while the second brake hose is connected to the second brake hose. Together with the first brake hose to one caliper, extend this second brake hose upward from the rear of the first brake hose and through the rear outer surface of the front fender to the other caliper A front-wheel brake piping device for a two-wheeled vehicle, wherein the piping system is connected to the front-wheel brake piping device.