JP3108882B2 - Motorcycle braking device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motorcycle brake device having a master cylinder for supplying brake fluid to a brake.

[0002]

2. Description of the Related Art Some motorcycles are provided with a master cylinder on a vehicle body frame and operate the master cylinder by, for example, operating a brake pedal to supply brake fluid to a brake to perform braking. Is connected to a reservoir tank via a reservoir hose. The master cylinder is mounted on a rear arm bracket near the brake pedal, for example, and the reservoir tank is mounted on a back stay connected to the rear arm bracket, for example.The reservoir hose connecting the master cylinder and the reservoir tank is mounted on the rear arm bracket or the back arm. It is held on the stay by a boulder so that it does not interfere with other members as much as possible.

[0003]

By the way, when the reservoir hose connecting portion of the master cylinder is located outside the vehicle body, the reservoir hose connecting portion is directed to the vehicle body inner side because it may interfere with an obstacle. Is also retained inside the rear arm bracket and backstay.

[0004] In this way, since the reservoir hose is located inside the rear arm bracket and the back stay,
For example, the muffler and the rear arm are arranged inside the vehicle body, and interference with the reservoir hose occurs depending on the arrangement position.

[0005] The reservoir hose is held on the rear arm bracket or the back stay by a holder or the like. In particular, a back stay or a brake pedal is mounted near the reservoir hose connection portion of the master cylinder, and the rear arm bracket is wide. In some cases, the reservoir hose cannot be easily and securely held.

The present invention has been made in view of the above circumstances, and prevents a reservoir hose from interfering with a muffler, a rear arm, and the like located inside a vehicle body, and can easily and reliably hold the reservoir hose. It is an object of the present invention to provide a brake device for a motorcycle.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an upper mounting boss and a lower mounting boss which are paired up and down from the lower rear end of a vehicle body frame and project rearward. A master cylinder that supplies brake fluid to the motorcycle is tightened and fixed with a bolt, and a reservoir hose is extended from the master cylinder and connected to a reservoir tank. In the brake device of the motorcycle, the reservoir hose of the master cylinder is connected to the upper mounting boss. A locking portion extending upward integrally from the portion is formed, a step is provided in an intermediate portion so that the upper side is offset from the lower side toward the inside of the vehicle body, and a hole is formed in the step portion, and the upper mounting boss and the Place the reservoir hose connection in the intermediate space with the lower mounting boss,
The reservoir hose attached to the reservoir hose connection portion was once guided to the inside of the vehicle body, then guided upward from the inside of the vehicle body to the outside of the vehicle body, and connected to the reservoir tank located above the master cylinder. It is characterized by:

According to the present invention, the upper mounting boss is formed with a locking portion extending upward from the tightening portion of the master cylinder, and a step is provided at an intermediate portion so that the upper portion is offset from the lower portion into the vehicle body. A hole is drilled in this step, and the reservoir hose is guided upward from the inside of the vehicle body to the outside of the vehicle body, so that the reservoir hose is positioned by the hole of the locking portion and by the locking portion extending upward. It is guided so as to rise straight outside the vehicle.

Therefore, even if the reservoir hose extends upward, it can be prevented from interfering with a muffler, a rear arm, etc. located inside the vehicle body and close to the master cylinder, and the reservoir tank can be protected from dust and water without deteriorating its appearance. It can be provided at an optimal position above the vehicle body without wearing, and the degree of freedom of installation can be increased.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings. 1 is a side view of a motorcycle, FIG. 2 is a side view of a vehicle body frame, FIG. 3 is a plan view of a vehicle body frame, FIG. 4 is a side view of a brake device of the motorcycle, FIG. 6 is a sectional view taken along the line VI-VI of FIG. 4, and FIG. 7 is a sectional view taken along the line VII-VII of FIG.

The motorcycle is used, for example, for motocross competitions running on uneven terrain. A front fork 3 is supported on a head pipe 2 constituting a body frame 1, and a lower end of the front fork 3 is provided. Is provided with a front wheel 4. A front fender 5 is attached to the front fork 3, and the front fender 5 uses a fixed fender that does not interlock with the vertical movement of the front wheel 4.

A pair of left and right substantially linear main frames 6 each having a vertical and wide cross section and a rectangular cross section as viewed from the side are connected to the upper portion of the head pipe 2, and extend substantially linearly behind the main frames 6. A pair of left and right rear arm brackets 7 are welded to the parts. The pair of left and right main frames 6 are extruded materials, are formed in a substantially linear shape in plan view, and have a front side slightly bent inward. An upper portion of an upper down tube 8 extending rearward and downward is connected to a rear center of the head pipe 2, and a reinforcing plate 9 is welded to an upper portion of the upper down tube 8. Is connected to a connecting bracket 10, and the connecting bracket 10 has a pair of left and right lower down tubes 11 attached thereto.
And a pair of right and left rear arm brackets 7 are fixed to the rear end, respectively.

An engine 12 is mounted in a space of a body frame 1 surrounded by a head pipe 2, a main frame 6, an upper down tube 8, a lower down tube 11, a rear arm bracket 7, and the like. Is supported by the engine mounting bracket 15. The center frame 14 is located at the center of the pair of left and right main frames 6, and its front end is connected to substantially the center of the reinforcing plate 9 of the upper down tube 8. It is connected to the member 16.

A pair of left and right back stays 17 are mounted on the upper part of the rear arm bracket 7, and the back stays 17 support a seat rail 18. The front ends of the seat rails 18 are respectively connected to the mounting portions 19 of the cross members 16, and the fuel tank 20 is disposed so as to cover a position substantially above the center of the seat rail 18 from the main frame 6. Seat rail 18
The sheet 21 is disposed on the upper side. A part 20a of the bottom of the fuel tank 20 straddles the central frame 14, and the engine 1
The fuel tank 20 extends to the vicinity of the second cylinder 13, thereby securing the volume of the fuel tank 20 in a limited space around the engine.

A rear arm pivot 22 is provided between the rear arm brackets 7.
A rear arm 23 is pivotally supported on the rear arm 23, and a rear wheel 24 is supported at a rear portion of the rear arm 23. A link mechanism 25 is provided between the rear arm 23 and the rear arm bracket 7.
A rear cushion 26 is provided between the rear cushion 26a and the rear cushion 26a.

A radiator 27 is arranged at a front upper position of the engine 12, and the radiator 27 is attached to the upper down tube 8. Radiator 27 is pipe 2
The engine 12 is connected to the side of the engine 12 via 8, 29, and circulates cooling water to cool the engine 12. Both sides of the radiator 27 are covered with a radiator cover 30 attached to the main frame 6 and the upper down tube 8, and the radiator cover 30 guides the traveling wind to the radiator 27. Further, the radiator cover 30 is connected to the fuel tank 20.
It is continuous with the outside surface of the car and serves as the rider's knee rest.

A carburetor 31 is connected to the rear side of the cylinder 13 of the engine 12.
The air cleaner 33 is connected via the
Are arranged on the left side of the vehicle body so as not to interfere with the rear cushion 26. The air cleaner 33 is disposed at a position below the seat 21 behind the rear cushion 26 so as not to interfere with the rear cushion 26.

A muffler 34 is connected to the front side of the cylinder 13 of the engine 12. The muffler 34 is bent from the left side to the right side of the vehicle below the front side of the lower down tube 11, and a rear arm bracket connected to the right main frame 6. 7 extends rearward through the inside of the back stay 17.

In this motorcycle, since a pair of left and right main frames 6 are connected to the head pipe 2 and the rear arm bracket 7 is connected to the rear end of the main frame 6, the massler 34 is connected to the right main frame 6 and the rear arm. When it is arranged outside the bracket 7, the vehicle width is increased, so that it is arranged inside. Further, since the main frame 6 is formed of an extruded material, the interval between the pair of left and right main frames 6 is reduced, and the muffler 34 extends rearward through a position above the engine 12.

Steps 35 are provided on the outer sides of the left and right rear arm brackets 7, respectively. The rear side surface 7a of the right rear arm bracket 7 near the step 35 is provided.
Is integrally formed with a brake pedal mounting portion 36 protruding rearward. A support shaft 37 is fastened and fixed to the brake pedal mounting portion 36 with a nut 38.
The base 39a of the brake pedal 39 is
And it is rotatable. A pressing portion 39b is formed integrally with a base portion 39a of the brake pedal 39. The pressing portion 39b is connected to a head 43a of a rod 43 provided on the master cylinder 42 via a pin 41, and is operated by operating the brake pedal 39. The rod 43 is moved forward. A return spring 44 is provided between the brake pedal 39 and the rear arm bracket 7, and returns to the initial position by this return spring 44 to release the operation of the master cylinder 42.

The master cylinder 42 is secured to the lower mounting boss 44 and the upper mounting boss 45 integrally formed by projecting rearward from the rear side surface of the rear arm bracket 7 by bolts 46 and 47, respectively. At the position above the mounting boss 45, the tip of the back stay 17 is
It is fastened and fixed.

The upper mounting boss 45 has a master cylinder 42
A locking portion 49 integrally extending upward from the tightening portion is formed, a step is provided in an intermediate portion so that the upper portion 49a is offset from the lower portion 49b toward the inside of the vehicle body, and a hole 49d is formed in the step portion 49c. Have been.

In the intermediate space between the upper mounting boss 45 and the lower mounting boss 44, a reservoir hose connecting portion 51 of the master cylinder 42 is provided in the direction of the rear arm bracket 7 and toward the inside of the vehicle body. The distal end portion 50a of the reservoir hose 50 is attached to the reservoir hose connection portion 51. The reservoir hose 50 is once guided to the inside of the vehicle body, and then guided from the inside of the vehicle body to the outside of the vehicle body upward in the hole 49d. The rear end portion 50b of the back stay 50 extends upward along the front side surface 17a of the 17 and is connected to a reservoir tank 52 mounted above. The reservoir tank 52 is located above the master cylinder 42.

As described above, the reservoir hose 50 is positioned by the hole 49d of the locking portion 49, and is guided by the locking portion 49 extending upward so as to rise straight outside the vehicle body. Further, by providing the reservoir hose 50 along the front side surface 17a of the back stay 17, the muffler 34 and the rear arm 2 passing above the rear arm bracket 7 are provided.
3 and the distance L1 and L2, which prevent the reservoir hose 50 from interfering with the muffler 34 and the rear arm 23. Position, and the degree of freedom of installation can be increased.

The distal end portion 50a of the reservoir hose 50 is inserted into the reservoir hose connecting portion 51 of the master cylinder 42 which faces inward of the vehicle body.
Is inserted from the inside of the vehicle body to the outside of the vehicle body and held. Therefore, the distal end portion 50a of the reservoir hose 50 does not protrude to the inside of the vehicle body, but is substantially within the width D of the rear arm bracket 7, and furthermore, smoothly and reliably engages with the locking portion 4 of the upper mounting boss 45.
9 is held.

Further, a locking portion 49 for holding the reservoir hose 50 is formed integrally with the upper mounting boss 45 of the master cylinder 42, so that there is no need to provide a separate member for holding the reservoir hose 50, and the holding structure is simple. is there.

A brake hose 54 is connected to the discharge portion 53 of the master cylinder 42. The brake hose 54 extends rearward along the rear arm 23 and is connected to a caliper 56 of a rear brake 55.
The disc plate 57 is braked by the brake fluid supplied from the discharge section 53 of the above.

The outer side of the vehicle body of the master cylinder 42 is covered with a cover 58. The cover 58 is attached to the lower mounting boss 44, the lower mounting boss 45 and the retaining nut member 40 of the brake pedal 39 with screws 59 on the rear arm bracket 7. The cover 58 prevents the mud and the like from adhering to the master cylinder 42.

[0029]

As described above, according to the present invention, the upper mounting boss is provided with a locking portion integrally extending upward from the tightening portion of the master cylinder, and the upper portion is offset from the lower portion into the vehicle body. A step is provided in the part, and a hole is drilled in this step, and the reservoir hose is guided upward from the inside of the vehicle body to the outside of the vehicle body, so that the reservoir hose is positioned by the hole of the locking portion, Guided so as to rise straight outside the vehicle body by the locking part extending upward,
Even if the reservoir hose extends upward, it can be prevented from interfering with the muffler, rear arm, etc. located inside the vehicle body and close to the master cylinder, and the reservoir tank is located above the vehicle body without damaging its appearance and being covered with dust and water. It can be provided at an optimal position, and the degree of freedom of installation can be increased.

[Brief description of the drawings]

FIG. 1 is a side view of a motorcycle.

FIG. 2 is a side view of the vehicle body frame.

FIG. 3 is a plan view of the vehicle body frame.

FIG. 4 is a side view of the brake device of the motorcycle.

FIG. 5 is a sectional view taken along line VV of FIG. 4;

FIG. 6 is a sectional view taken along the line VI-VI of FIG. 4;

FIG. 7 is a sectional view taken along the line VII-VII of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body frame 6 Main frame 7 Rear arm bracket 17 Back stay 42 Master cylinder 44 Lower mounting boss 45 Upper mounting boss 49 Engagement part 49a Upper part 49b Lower part 49c Step part 49d hole 50 Reservoir hose 50a Tip part 50b Rear end 51 Reservoir hose connection Part 52 reservoir tank

Continuation of the front page (56) References JP-A-59-134078 (JP, A) JP-A-60-169391 (JP, A) JP-A-59-209985 (JP, A) JP-A-4-27688 (JP) , A) Fully open sho 63-105596 (JP, U) Fully open sho 63-4975 (JP, U) Fully open sho 63-184195 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB Name) B62L 3/04 B62L 3/00

Claims (1)

(57) [Claims] An upper mounting boss and a lower mounting boss are projected upward and downward from the lower rear end of the body frame in a pair, and a master cylinder for supplying brake fluid to the brakes is fastened to both bosses by bolts. A motorcycle having a reservoir hose extending from the master cylinder and connected to a reservoir tank, wherein the upper mounting boss is provided with a locking portion integrally extending upward from a reservoir hose connection portion of the master cylinder; A step is provided in an intermediate portion so that the upper side is offset from the lower side toward the inside of the vehicle body, and a hole is formed in this step, and the reservoir hose connection portion is provided in an intermediate space between the upper mounting boss and the lower mounting boss. Once placed, the reservoir hose attached to this reservoir hose connection is once guided inside the vehicle body, and then from the inside of the vehicle body to the outside of the vehicle, and the inside of the hole is directed upward. What guides the motorcycle braking device from the master cylinder, characterized in that connected to the reservoir tank positioned above.