JPH0214551Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a master cylinder for a two-wheeled vehicle.

[Conventional technology]

In conventional master cylinders for two-wheeled vehicles, the cylinder was placed almost parallel to the steering wheel, and the support for attaching the rearview mirror was also placed in a special position. There were flaws.

(1) Since the distance between the handle fixing part and the lever fixing part is large, force transmission is poor and a bending moment is applied when the brake lever is activated, so it must be made of a material with high rigidity.

(2) Since the operating direction of the brake lever and the operating direction of the cylinder are arranged at right angles, power loss is likely to occur.

(3) A separate mechanism was required to attach the brake lever.

[Summary of the idea]

The present invention eliminates the above-mentioned drawbacks by arranging the cylinder in a direction substantially perpendicular to the handlebar and intersecting the handlebar, and by providing a rotating shaft for the brake lever in the holder that holds the cylinder. This will be explained in detail below using examples.

[Example of idea]

The master cylinder of the present invention is constructed as follows. That is, as shown in FIGS. 1 and 2, the main cylinder 1 is provided with a discharge port 8 on the front end side thereof that communicates with the wheel brake cylinder, and a pressure chamber is located at the rear of the discharge port 8. This pressure chamber is configured to communicate with an adjacent reservoir tank 3 through a supply port 1b and a relief port 1c formed on one side thereof. A piston 2 is housed on the rear side of the pressure chamber, which is constantly pressed in the non-operating direction by the bullet. On the rear end surface of the piston 2 disposed in the opening of the cylinder 1 as described above, the tip of a push rod 9 supported with a pin on the side of the brake lever 6 (to be described later) can be pushed out against the piston 2. Pressure-welded as possible.

Next, a holder 4 shown below is arranged on the bottom side of the cylinder 1 in order to attach a reservoir tank 3 located adjacent to the cylinder 1 to the handle H. When this holder 4 matches the semicircular recess 1a formed at the bottom of the cylinder 1, it becomes a perfect circle that can fit into the handle H, and has an arcuate shape that allows the handle H to be held therein. Tightening piece 4a
and a fixing piece 4b extending horizontally from both ends of the tightening piece 4a and having a bolt hole (not shown) for integrally assembling it with the cylinder 1. After one fixed piece 4b stands up, it is further extended laterally to become an arm piece P.A mounting hole 4c for inserting the base of a back mirror mounting column 10, which will be described later, is formed through the extended surface of the fixed piece 4b. has been done. The holder 4 according to this embodiment has a contact surface formed by the fixing pieces 4b at both ends on the bottom of the cylinder 1, and a bolt 7 screwed into the fixing piece 4b from a bolt hole (not shown) provided in the fixing piece 4b. It is detachably attached so that it can be installed. Note that the recess 1 formed at the bottom of the cylinder 1
a and the tightening piece 4a of the holder 4 are formed so as to be arranged at right angles to the handle H when both are assembled in a perfect circle.

At one end of the reservoir tank 3 which is integral with the cylinder 1, a lever bracket 5 as an arm side facing the arm piece P is provided to protrude forward.
This lever bracket 5 has the above-mentioned holder 4.
A mounting hole 5 that is vertically concentric with the threaded portion 4c of
A is installed through the hole. The base end of the brake lever 6 is fitted into the air space between the bracket 5 and the fixed piece 4b directly below. A back mirror mounting column 10, which has a blank hole on the upper end side and a threaded part on the lower end side, is attached to the fixing piece 4b.
It is fixed to the fixing piece 4b in an upright manner by inserting the threaded portion into the mounting hole 4c and tightening the nut 12 on the outside below. As a result, the lever 6 is assembled so that it can rotate in the horizontal direction using the back mirror mounting column 10 as a fulcrum. Further, a basic nut 11 is concentrically welded to the upper surface of the threaded portion 5a of the bracket 5, and a mirror support 14 with a back mirror (not shown) attached to the top is screwed into the threaded portion 14a at the lower end. The nut 13 is attached to the threaded portion on the main nut 11 with a double nut hook so that it can be attached and detached for replacement. The tip of the threaded portion 14a of the mirror support 14 is inserted in a positioning manner into a blank hole at the upper end of the back mirror mounting support 10 (which functions as a pivot shaft for the lever 6). Back mirror mounting support 10 mentioned above
A base portion of the aforementioned push rod 9 is swingably connected to the surface portion of the base end side of the brake lever 6 near the brake lever 6 by means of a pin inserted therethrough. When the brake lever 6 is operated, the piston 2 is interlocked with the pushing force of the push rod 9 and is incorporated so that compression operation can be performed within the cylinder 1, and the whole is constituted as a master cylinder as a unit. There is.

Since this embodiment is configured as described above,
When installing the cylinder 1 in the above embodiment on the handle H of a two-wheeled vehicle, first remove the holder 4 described above from the bottom position of the cylinder 1, place the bottom recess 1a of the cylinder 1 on the top surface of the handle H, and then The holder 4, which has been removed as described above, is brought into contact with the lower side of the handle H in the manner shown in FIG. By screwing the bolt 7 into the screw hole and tightening it, the master cylinder can be easily and securely mounted on the handle H of the two-wheeled vehicle in such a manner that the cylinder 1 is disposed at right angles to the handle H. When attaching and detaching the holder 4 as described above, this holder 4
The back mirror mounting post 10 inserted into the fixed piece 4b is separate from the mirror post 14 attached to the lever bracket 5 side, so when the holder 4 is attached or removed, the mirror post 14 also needs to be removed. Since there is no such thing, double work can be omitted.

The master cylinder mounted on the handle H as described above has the rear mirror mounting column 1 which serves as the fulcrum of the brake lever 6 because the cylinder 1 is mounted at right angles to the handle H.
0 is an arrangement state in which the master cylinder is placed as close as possible to the handle H compared to the conventional master cylinder. Therefore, the lever 6 that performs the brake operation using the mounting post 10 as a fulcrum requires only a minimum bending moment during its operation, thereby allowing the brake operation to be performed smoothly and easily. In this case, due to the right angle arrangement of the cylinder 1, the lever fixing part (back mirror mounting column 10 related part), the handle fixing part (holder 4 related part), the cylinder part (cylinder 1 related part) and the handle fixing part (back mirror mounting column related part) 10 related parts) can be made closer to each other.

In addition, when the brake lever 6 is operated as described above, the push rod 9 pushes the piston 2 in the pressurizing direction through the opening of the piston 2, so the action of the cylinder compressed by the pushing operation allows for smooth brake operation. It can be carried out. In this case, since the cylinder 1 is arranged perpendicular to the axial direction of the handle H, the push rod 9
Since the push-out operation can be performed toward the axis of the piston 2, the piston 2, which operates in response to the push-out of the rod 9, can also operate concentrically with the rod 9, thereby reducing the degree of wear and tear on the push rod 9. can be drastically reduced.

Furthermore, when replacing the back mirror, first loosen the nuts 13 that are double hooked on the upper surface of the lever bracket 5, then turn the mirror support 14 in the direction of screwing it back and loosen the screw that was screwed into the main nut 11. The portion 14a can be easily and quickly removed. At that time, the back mirror mounting post 10 directly below is
Since it is inserted into the fixed piece 4b of the holder 4 that is integrated with the cylinder 1, there is no need to remove the brake lever 6 when replacing the rear mirror. can definitely be omitted.

In the above embodiment, the mirror support 14 is connected to the lever bracket 5, and the back mirror mounting support 10 is connected to the lever bracket 5.
are attached to the fixing pieces 4b of the holder 4, but the present invention is not limited to the above-mentioned embodiment. A series of collars are inserted into the mounting holes 4c of the fixing piece 4b, and the screw portion 14a of the mirror support 14 is formed into a long body that can be inserted through the interior of the collar, thereby attaching the base of the mirror support 14. With the thick end portion in contact with the upper surface of the bracket 5, it may be inserted into the collar and tightened by hooking a nut onto the threaded portion 14a that protrudes downwardly to the outside of the fixing piece 4b. When replacing the rearview mirror, the collar can be maintained in its original state as the rotation axis of the brake lever 6, so as in the above embodiment,
The rearview mirror can be replaced without removing the lever.

[Effect of idea]

As explained above, the present invention integrates the cylinder to the side of the reservoir tank, positions it approximately perpendicular to the direction of extension of the handle, and intersects with the handle, and surrounds the lower side of the handle. A holder consisting of a tightening piece that clamps the handle with the reservoir tank is provided, and an arm piece is provided on the holder to attach the rotating shaft of the brake lever, so the cylinder length can be lengthened and the hydraulic pressure ratio can be improved. Since the center of rotation of the lever can be moved closer to the steering wheel, the opening angle of the lever can be made smaller, making it suitable for smaller car models. Also,
Even if an impact is applied to the lever from the front, this impact is transmitted to the handle and absorbed, preventing damage to the cylinder side. Furthermore, since the handle is clamped between the holder and the reservoir tank, the stability of the installation is improved.

[Brief explanation of the drawing]

FIG. 1 is a partially cross-sectional plan view showing a master cylinder according to the present invention, and FIG. 2 is a schematic diagram showing how the holder and rearview mirror base are attached to the master cylinder. 1... Cylinder, 2... Piston, 3... Reservoir tank, 4... Holder, 4a... Tightening piece,
4b... Fixed piece, 5... Lever bracket, 6...
...Brake lever, 8...Discharge port, 10...Back mirror mounting column, 11...Main nut, 14...
...Mirror support, H...handle.

Claims (1)

[Scope of utility model registration request] A reservoir tank located above the handle, a piston interlocked with a rotatably provided brake lever, and a cylinder housing the piston and communicating with the reservoir tank and having an oil discharge port. In a master cylinder for a two-wheeled vehicle, the above-mentioned cylinder is integrated next to the reservoir tank, and is positioned approximately at right angles to the extension direction of the handlebar, and intersects with the handlebar, and the above-mentioned cylinder is placed around the lower side of the handlebar. A master cylinder comprising: a holder comprising a tightening piece that clamps a handle with a reservoir tank; and an arm piece for attaching a rotating shaft of the brake lever to the holder.