JP2001063547A - Front wheel brake device for motorcycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of parts used for a hose joint, thereby to contribute to cost reduction. SOLUTION: A joint main body of a hose joint 34 is formed into a cylinder with its both ends closed and is fixed to a bottom bridge 4b of a front fork with its axis oriented in a longitudinal direction of a vehicle. A peripheral wall of the joint main body is formed with first, second and third joint holes respectively engaging with and welded to a first connection pipe 41 facing upward, a second connection pipe 42 facing the lower right and a third connection pipe 43 facing the lower left, and first, second and third brake hoses 31, 32, 33 are respectively connected to the first, second and third connection pipes 41, 42, 43 for inverse Y-shaped piping.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a master cylinder mounted on an upper portion of a front fork, a pair of left and right front wheel brakes provided on a front wheel pivotally supported at a lower end of the front fork, and a first cylinder connected to the master cylinder. A front wheel brake for a motorcycle, comprising: a brake hose, a second brake hose connected to a right front wheel brake, a third brake hose connected to a left front wheel brake, and a hose joint connecting these three brake hoses to each other. It relates to improvement of the device.

[0002]

2. Description of the Related Art In such a conventional motorcycle front wheel brake device, as shown in FIG. 4, a cylindrical joint main body 035 is provided with a bottom of a front fork 1 whose axial direction is directed to the left and right direction of the vehicle. Fixed to the bridge 4b,
A first banjo joint 51 having an upward first connecting pipe 041 and a downward second connecting pipe 042 at one end of the joint body 035, and a third banjo joint 51 at the other end.
A second banjo joint 52 having a connecting pipe 042 is screwed into each of the first, second, and third connecting pipes 041,0.
42,043, the first, second and third brake hoses 0
31, 032, 033 are connected respectively.

[0003]

SUMMARY OF THE INVENTION In the above conventional device,
Since the hose joint has a pair of banjo joints, the number of parts is large, and it has been difficult to reduce the cost.

The present invention has been made in view of the above circumstances, and has as its object to provide a motorcycle front wheel brake device capable of reducing the number of hose joint parts and contributing to cost reduction. And

[0005]

SUMMARY OF THE INVENTION To achieve the above object, the present invention provides a master cylinder mounted on an upper portion of a front fork, and a pair of left and right wheels provided on a front wheel supported at a lower end of the front fork. Hose joint for connecting these three brake hoses to the front brakes, the first brake hose connected to the master cylinder, the second brake hose connected to the right front wheel brake, the third brake hose connected to the left front wheel brake In the motorcycle front wheel brake device, the joint body of the hose joint is formed in a cylindrical shape with both ends closed, and the joint body is positioned at the bottom of the front fork with its axis oriented in the front-rear direction of the vehicle. The first connecting pipe, which is fixed to the bridge and is First, second and third connection holes for fitting and joining the downwardly facing second connecting pipe and the downwardly facing third connecting pipe respectively are formed in the first, second and third connecting pipes. The first, second and third brake hoses are connected respectively.

According to this feature, the hose joint is
The cylindrical joint body and the first and
The first and the first fitting and joining the second and third connection holes respectively.
It is composed of the second and third connection pipes, and the number of parts can be greatly reduced as compared with a conventional hose joint using a banjo joint, which can greatly contribute to cost reduction. In particular, on the peripheral wall of the cylindrical joint body,
Since the opening angle between the first, second and third connection pipes can be freely set by selecting the positions of the first, second and third connection holes, various hose joints corresponding to various motorcycles can be used. In order to obtain the best inverted Y-shaped piping, the cost of various hose joints can be provided at low cost.

In addition, since the first, second and third brake hoses are compactly piped in a substantially symmetrical inverted Y-shape by means of a hose joint, the appearance can be improved. In addition, the inverted Y-shape piping of the first, second and third brake hoses can equalize the degree of flexure of the second and third brake hoses when the front wheel brake moves up and down due to the expansion and contraction of the front fork. Can be planned.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on one embodiment of the present invention shown in the accompanying drawings.

FIG. 1 is a longitudinal sectional front view of a main part of a front wheel brake device for a motorcycle according to an embodiment of the present invention, FIG. 2 is an enlarged view of a portion around a front axle in FIG. 1, and FIG. It is an enlarged view of a part.

First, in FIG. 1, reference numeral 1 denotes a front fork of a motorcycle.
h, 2 m. Each of the fork legs 2h and 2m is configured by fitting a cylindrical upper case 3a and a lower case 3b so as to be able to expand and contract with each other.
The upper cases 3a, 3a are integrally connected to each other by a top bridge 4a and a bottom bridge 4b arranged vertically.

The top bridge 4a and the bottom bridge 4
Both ends of the steering stem 5 are fixed to the left and right central portions of b and are steerably supported by the head pipe 6 at the front end of the vehicle body frame. A steering handle (not shown) is attached to the top bridge 4a, and a master cylinder M for operating front wheel brakes 21L and 21R described later is attached to the handle.

As shown in FIGS. 1 and 2, both ends of a front axle 8 supporting a front wheel 7 are fixed to lower ends of lower cases 3b, 3b of both fork legs 2h, 2m.
The front axle 8 is composed of a short large-diameter shaft portion 8a and a long small-diameter shaft portion 8b coaxially connected via a step portion 8c, and is provided on the small-diameter shaft portion 8b via a pair of left and right ball bearings 9,9. The hub 7a of the front wheel 7 is supported. The front axle 8 is hollow throughout its entire length. The hollow opening end of the large-diameter shaft portion 8a is formed in a hexagonal hole 10 for engaging a non-rotating wrench, and a hook hole 11 for a drawing tool is formed in its peripheral wall. Is drilled. In addition, small diameter shaft 8
The end of the hollow opening b is formed in the screw hole 12.

On the other hand, at the lower ends of the left and right lower cases 3a, 3a, large-diameter support holes 13 and small-diameter support holes 14 corresponding to the large-diameter shaft portion 8a and the small-diameter shaft portion 8b are formed.
To open at the lower end of each lower case 3b, 3b
5 and 15 are respectively provided. Larger diameter support hole 1
An annular concave portion 16 is formed on the inner peripheral surface of 3 at a position corresponding to the hook hole 11.

In mounting the front wheel 7 to the front fork 1, first, the left and right lower cases 3b, 3b
Between the hub 7a of the front wheel 7 and the spacers 17, 18 adjacent to the outside of the left and right bearings 9, 9, the small-diameter shaft portion 8 of the front axle 8 is arranged from the large-diameter support hole 13 side.
b is a spacer 17, a bearing 9, 9, a spacer 18,
It is sequentially inserted into the small-diameter support hole 14. Next, the small diameter support hole 14
By screwing and tightening a bolt 19 inserted from the outer end side of the screw hole 12 into the screw hole 12 of the small diameter shaft portion 8b, a step portion 8c between the large diameter shaft portion 8a and the small diameter shaft portion 8b and a small diameter support hole 14 are provided. Unnecessary thrust gaps are removed from the inner surface of the lower case 3b. Finally, bolts 20, 20 are screwed and tightened to the lower end of each lower case 3b so as to close the slits 15, 15, and the large-diameter shaft portion 8a and the small-diameter shaft portion 8b are fixed to the left and right lower cases 3b. . At this time, the large diameter shaft portion 8a
The axial dimension is set in advance so that the outer end surface substantially matches the outer surface of the corresponding lower case 3b. Therefore, there is no outward protrusion from the large-diameter support hole 13, so that
It can reduce air resistance during traveling and prevent the generation of wind noise, and can also contribute to weight reduction.

Even if the inner peripheral surface of the large-diameter support hole 13 strongly tightens the large-diameter shaft portion 8a, there is an annular recess 16 around the hook hole 11 formed in the large-diameter shaft portion 8a. Therefore, the inner peripheral surface of the large-diameter support hole 13 does not bite into the hook hole 11, and therefore, when the front wheel 7 is removed, the removal tool is engaged with the hook hole 11, and the front axle 8 is connected to the front fork 1. Can be easily extracted from

Referring again to FIG. 1, the front wheel 7 is equipped with a pair of left and right front wheel brakes Bh and Bm for applying a braking force thereto. Each front wheel brake Bh, Bm is connected to the hub 7 of the front wheel 7.
a, a pair of friction pads 23, 23 opposed to both sides of the brake disk 22, and these friction pads 23, 23 are pressed against the brake disk 22. A conventional ordinary disk brake comprising pistons 24, 24 and brake calipers 26 having wheel cylinders 25, 25 for accommodating the pistons 24, 24, respectively, and being supported by a lower case 3b on the same side, is provided. The friction pads 23 are supported by brake calipers 26 via hanger pins 27. If hydraulic pressure is supplied from the master cylinder M attached to the steering handle to the wheel cylinders 25, 25, the pistons 24, 2
4 can be moved forward to bring the friction pads 23, 23 into pressure contact with the brake disc 22 to generate a braking force.

A first brake hose 31 is provided at the output port 30 of the master cylinder M, a second brake hose 32 is provided at the wheel cylinder 25 of the right front wheel brake Bh, and a third brake hose 33 is provided at the wheel cylinder 25 of the left front wheel brake Bm. These three brake hoses 31, 32, 33 are connected to each other by a hose joint 34 attached near the center in the left-right direction of the bottom bridge 4b, that is, near the steering stem 5.

As shown in FIG.
Has a cylindrical joint body 35 with both ends closed,
A mounting piece 36 is integrally formed on one side thereof, and the mounting piece 36 is fixed to the bottom bridge 4b with a bolt 37 with the axis of the joint body 35 facing the front-rear direction of the vehicle. Also, on the peripheral wall of the joint body 35,
First, second and third connection holes 38, 39, 4 arranged in the circumferential direction
The first, second, and third connection pipes 41, 42, 43 are fitted and welded to these, respectively.
In this case, the three connection holes 38, 39, and 40 are arranged in an inverted Y-shape with the first connection pipe 41 facing upward, the second connection pipe 42 facing right downward, and the third connection pipe 43 facing left lower. It is provided as follows. Therefore, the first, second and third connecting pipes 4
1, 42, 43, the first, second and third brake hoses 3
When 1, 32 and 33 are respectively connected, these three brake hoses are also piped in an inverted Y-shape.

In the above, the second and third brake hoses 3 connected to at least the left and right front wheel brakes Bh, Bm
2 and 33 are made of a flexible material.

Referring again to FIG. 1, a front fender 44 for covering the front wheel 7 and other vertically moving parts from above is supported by the left and right lower cases 3b. A pair of clips 45, 45 for holding respective intermediate portions of the second and third brake hoses 33 are provided on both left and right side surfaces of the front fender 44.

Next, the operation of this embodiment will be described.

When the master cylinder M is actuated to brake the front wheels 7, the output oil pressure reaches the hose joint 34 via the first brake hose 31, where the second and third hydraulic cylinders are moved.
Distributed to the brake hoses 32, 33 and supplied to the respective wheel cylinders 25, 25 of the left and right front wheel brakes Bh, Bm to apply a braking force to the respective brake disks 22, 22 to brake the front wheels 7 as described above. Can be.

In such a brake device, the first, second and third connection pipes 41, 42, 4 arranged in a substantially Y-shape are provided.
3 is attached to the bottom bridge 4b near the steering stem 5, and the first, second and third brake hoses 31, 32, 32 are attached to the first, second and third connection pipes 41, 42, 43 thereof. 33 is connected, the first, second, and third brake hoses are piped in a substantially bilaterally symmetrical Y-shape that is bifurcated from the vicinity of the steering stem 5, and is used to raise and lower the front wheel 7. As the front hose 1 expands and contracts, the left and right brake calipers 26, 2
6 moves up and down, the second and third brake hoses 3
The degree of flexure of the brake hoses 2 and 33 can be equalized, and interference of the brake hoses 32 and 33 with the front wheel 7 can be easily avoided. In addition, the compact Y-shaped pipe can reduce the weight and improve the appearance.

Moreover, the first, second and third connection pipes 41,
Three connection holes 38, 39, 40 for fitting 42, 43
Are drilled side by side in the circumferential direction on the peripheral wall of the joint body 35, so that the drilling positions are adjusted to the desired opening angles of the first, second and third connection pipes 41, 42, 43, so that various In a motorcycle, a plurality of types of hose joints for performing the best inverted Y-shaped piping of the first, second, and third brake hoses 31, 32, and 33 can be provided at low cost.

The present invention is not limited to the above embodiment, and various design changes can be made without departing from the gist of the present invention. For example, instead of welding the connection pipes 41, 42, 43 to the joint body 35, brazing, bonding, or the like can be used.

[0026]

As described above, according to the present invention, one master cylinder mounted on the upper portion of the front fork, a pair of left and right front wheel brakes provided on the front wheel pivotally supported at the lower end of the front fork, A first brake hose connected to the cylinder, a second brake hose connected to the right front wheel brake, and a third brake hose connected to the left front wheel brake
In a motorcycle front wheel brake device having a brake hose and a hose joint for connecting these three brake hoses to each other, a joint body of the hose joint is formed in a cylindrical shape having both ends closed, and the joint body is formed. Is fixed to the bottom bridge of the front fork with its axis oriented in the front-rear direction of the vehicle, and the first connecting pipe facing upward, the second connecting pipe facing downward right, and the third connecting pipe facing downward left are fixed to the peripheral wall of the joint body. Are mated,
First, second, and third connection holes to be joined were formed, and first, second, and third brake hoses were connected to the first, second, and third connection pipes, respectively, so a banjo joint was used. The number of parts can be greatly reduced as compared with the conventional hose joint, which can greatly contribute to cost reduction. In particular, on the peripheral wall of the cylindrical joint body, the first, second and third
Since the opening angle between the first, second and third connection pipes can be freely set by selecting the position of the connection hole, various hose joints corresponding to various motorcycles can be used to obtain the best inverted Y-shaped piping of the hose. Therefore, the cost of various hose joints can be provided at low cost. Moreover, the first, second, and third brake hoses are compactly piped in a substantially symmetrical inverted Y-shape by the hose joint, so that the appearance can be improved. Not only the first, second and third
Due to the inverted Y-shaped piping of the brake hose, the degree of bending of the second and third brake hoses can be equalized when the front wheel brake moves up and down due to the expansion and contraction operation of the front fork.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view of a main part of a front wheel brake device for a motorcycle according to one embodiment of the present invention.

FIG. 2 is an enlarged view of a part around a front axle in FIG. 1;

FIG. 3 is an enlarged view of a portion around a hose joint in FIG. 1;

FIG. 4 is an explanatory view of a conventional example.

[Explanation of symbols]

 Bh: right front wheel brake Bm: left front wheel brake M: master cylinder 7: front wheel 1: front fork 4b: bottom bridge 31: first brake hose 32 ..Second brake hose 33 ... third brake hose 34 ... hose joint 35 ... joint body 38 ... first connection hole 39 ... second connection hole 40 ... third connection hole 41 ... first connection pipe 42 ... second connection pipe 43 ... third connection pipe

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Toshi Iwashita 1-4-1 Chuo, Wako-shi, Saitama Pref. Inside Honda R & D Co., Ltd. (72) Inventor Tadashi Natsume 1-4-1 Chuo, Wako-shi, Saitama Inside Honda R & D Co., Ltd. (72) Shinichi Kuwahara, Inventor 1-4-1 Chuo, Wako-shi, Saitama Prefecture Inside Honda R & D Co., Ltd. (72) Yoshimi Ishikawa 1-4-1, Chuo, Wako-shi, Saitama Pref. No. F-term in Honda R & D Co., Ltd. (Reference) 3D047 AA01 BB32 CC35 CC36 FF01 3D049 AA01 BB32 CC02 HH43 KK03 3J058 BA62 CD03 FA02

Claims (1)

[Claims] 1. A master cylinder (M) mounted on an upper portion of a front fork (1) and a pair of left and right front wheel brakes (1) provided on a front wheel (7) supported at a lower end of the front fork (1). Bh, Bm), a first brake hose (31) connected to the master cylinder (M), a second brake hose (32) connected to the right front wheel brake (Bm), and a third brake connected to the left front wheel brake (Bh). A front wheel brake device for a motorcycle, comprising a hose (33) and a hose joint (34) interconnecting the three brake hoses (31, 32, 33), wherein a joint of the hose joint (34) is provided. The body (35) is formed in a cylindrical shape with both ends closed,
The joint body (35) is oriented such that its axis is oriented in the front-rear direction of the vehicle and the bottom bridge (4) of the front fork.
b) and fixed to the peripheral wall of the joint body (35).
First, second and third connection holes (4) for fitting and joining the first connection pipe (41) facing upward, the second connection pipe (42) facing downward right, and the third connection pipe (43) facing downward left, respectively. 38,3
9, 40) and connect the first, second and third brake hoses (31, 32, 33) to the first, second and third connection pipes (41, 42, 43), respectively. A front wheel brake device for a motorcycle, characterized in that: