JPS6215080Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a hydraulic pressure generating device for operating a negative pressure booster in a motorcycle.

When controlling a negative pressure booster mechanically using an operating cable or rod, it is necessary to install the negative pressure booster in a position where the cable or rod can be operated by the operating lever. There may be restrictions on mounting locations and mounting angles due to space, balance, or appearance.

Therefore, by controlling the negative pressure booster using hydraulic pressure, the above-mentioned restriction can be lifted. In this case, the negative pressure booster is operated using a hydraulic pressure generating device such as a master cylinder, but in order to cope with the increase in piston stroke due to brake lining wear etc. Liquid is being supplied inside. However, in motorcycles, the hydraulic pressure generating device is generally attached to the handlebar, so the reserve tank is larger than the handlebar pipe or protrudes, which is not very desirable in terms of layout and balance.

Therefore, the present invention does not include a reserve tank in the hydraulic pressure generator, but instead uses a reserve tank in the negative pressure booster to prevent wear of the brake lining, making the entire hydraulic pressure generator compact. It is designed to achieve the intended purpose.

The illustrated embodiment will be described below. A front fork 2 is supported in a steerable manner at the front of a vehicle body frame 1. A handle 3 is fixed to the upper part of the front fork 2, and a front wheel 4 is attached to the lower part of the front fork 2. Rotatably supported.

A negative pressure booster 5 is provided on the front fork 2 via mounting members 6 and 7 at a required angle.
In this negative pressure booster 5, a push rod 8 is operated by hydraulic pressure, and a cylinder body 9 is integrally provided on the input side of the negative pressure booster body, and the push rod 8 and the cylinder body 9 are provided inside the cylinder 10 of the cylinder body 9. An integral piston 11 is slidably provided, and the cylinder body 9
A union 13 provided at one end of the brake hose 12 is attached with an oil bolt 15 via an oil washer 14 so that hydraulic pressure can be applied to the piston 11 to push the push rod 8. Further, the output side hydraulic cylinder 5a of the negative pressure booster 5 is provided with a reserve tank 16.
Note that 17 is a bleeder of the cylinder 10, 18 is a return spring of the push rod 8, and 19 is a vacuum hose that connects the negative pressure chamber and the intake manifold 20, which is a negative pressure source.

A cylinder 10 of a negative pressure booster 5 is attached to the handle 3.
The hydraulic pressure generating device 21 that transmits hydraulic pressure to the bolt 22
Fixed by This hydraulic pressure generating device 21 includes a push rod 24 in a cylinder 25 that is pushed by operating a brake lever 23, and a hydraulic chamber 27 is formed by a piston 26 provided at the tip of the rod 24 and the cylinder 25. , hydraulic chamber 27
There is a hydraulic pressure supply port 28 and an air vent port 2.
9 are formed on the main body of the hydraulic pressure generating device 21, and a union 30 provided at the other end of the brake hose 12 is attached to the hydraulic pressure supply port 28 with an oil bolt 32 via an oil washer 31. When the hydraulic pressure in the cylinder 25 is increased by the pushing motion of When the mechanism operates, hydraulic pressure is generated from the output side hydraulic cylinder 5a, and the front brake device 34 is actuated via the brake hose 33. A bleeder 35 is attached to the air bleed port 29. 36 is a cap of the bleeder 35, and 37 is a return spring of the push rod 23.

Next, when initially supplying oil to the hydraulic pressure generating device 21, as shown in FIG.
At the same time, tighten the bleeder 35, and connect the tank 38 containing the hydraulic fluid to the bleeder 3 through the hose 39.
5, open the bleeder 17 of the negative pressure booster 5, squeeze and rotate the brake lever 23, hold the push rod 24 in the pressed state to bleed the air, tighten the bleeder 17, and open the bleeder 35. By releasing the brake lever 23 and supplying oil from the tank 38, and repeating this process, the hydraulic chamber 27 of the hydraulic pressure generator 21 and the brake hose 1 are
2. The cylinder 10 of the negative pressure booster 5 can be vented. Then, the bleeders 17 and 35 are tightened, the hose 39 is removed from the bleeder 35, and the cap 36 is placed over the bleeder 35.

As described above, the present invention compensates for the increase in stroke due to brake lining wear etc. with the reserve tank of the hydraulic cylinder on the negative pressure booster side, and instead of installing a reserve tank in the hydraulic pressure generator, After draining, the bleeder is tightened to seal in the hydraulic fluid, which allows the hydraulic pressure generator to be made more compact, and when installed on a handlebar or other surface, there are fewer restrictions on where it can be installed, making it easier to adjust the layout of the motorcycle. This results in better balance and has better transmission efficiency than mechanical control.

[Brief explanation of the drawing]

Figure 1 is a front view showing one embodiment of the present invention;
The figure is an enlarged sectional view of the main part, and FIG. 3 is an enlarged sectional view showing air bleeding. 5 is a negative pressure booster, 8 is a push rod, 9 is a cylinder body, 10 is a cylinder, 11 is a piston,
12 is the brake hose, 16 is the reserve tank,
17 is a bleeder, 21 is a hydraulic pressure generator, 24 is a push rod, 25 is a cylinder, 26 is a piston, 27 is a hydraulic chamber, 29 is an air vent port, 3
5 is a breeder.

Claims (1)

[Scope of utility model registration request] In a motorcycle equipped with a hydraulic pressure generator that controls the negative pressure booster using hydraulic pressure, a reserve tank is provided in the output side hydraulic chamber of the negative pressure booster, and is formed by the cylinder and piston of the hydraulic pressure generator. for a motorcycle, characterized in that a hydraulic pressure supply port that transmits hydraulic pressure to the input side of a negative pressure booster and an air bleed port are connected to a hydraulic pressure chamber in which the air bleed is provided, and the air bleed port is equipped with a bleeder. Hydraulic pressure generator for input of negative pressure booster.