JPH08338402A - Reservoir tank - Google Patents

Abstract

PURPOSE: To provide a sure seal function between a partition and a bottom surface recessed part, while the partition of vertically dividing inside a tank is prevented from coming off from the reservoir tank bottom surface recessed part by a violet vibration. CONSTITUTION: Since a bowl-shaped member 12 of partitioning the upper/lower through a seal member 13 is mounted in a bottom surface recessed part 10 of a reservoir tank 1, in addition to making work easy of mounting the bowl- shaped member 12, a trouble of dislocating the seal member 13 from the recessed part can be prevented even when exposed in a violent vibration during running. Sureness is provided in also a seal between the seal member 13 and the bottom surface recessed part 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reservoir tank of a hydraulic operating device, and more particularly to a reservoir tank suitable for use as a master cylinder of a motorcycle.

[0002]

2. Description of the Related Art A conventional master cylinder used in a brake device of a motorcycle includes a pressure generating chamber for generating a brake fluid pressure by moving a piston in the cylinder by operating an operating lever, and this pressure generating chamber. It has a reservoir tank that is located above the communication port and communicates with the same pressure generation chamber through the communication hole. When the operation lever is operated and the piston moves, the communication hole is shut off and the pressure generation chamber is required. Is generated, the pressure is guided to the disc brake through the pipe, and the braking force can be applied to the wheels by the disc brake.

By the way, in the master cylinder having the above-mentioned structure, since the pressure generating chamber is simply communicated with the reservoir tank through the communication hole, a particularly violent vibration is exerted on the master cylinder during traveling, especially by motocross traveling. When added, the air enclosed in the reservoir tank is agitated with the brake fluid, and in some cases, it becomes bubbles and flows into the pressure generation chamber, and then into the piping to create an air pool, which causes brake operation. May cause problems.

Therefore, in order to eliminate the above-mentioned inconvenience, various reservoir tanks have been proposed in which bubbles are prevented from flowing into the pressure generating chamber arranged below the reservoir tank (for example, actually fairness). 3-38481, JP-B-59-27326, JP-B-53-38
331, and Japanese Utility Model Laid-Open No. 61-54984).

Among these, the reservoir tank disclosed in Japanese Utility Model Publication No. 3-38481 is provided with a partition wall for partitioning the interior of the tank into upper and lower parts, and a plurality of communication holes are provided at the peripheral edge of the partition wall. The feature of these communication holes is that they are arranged almost symmetrically about the center of the partition wall, so that the air mixed at the time of liquid injection is separated into the upper chamber only by its buoyancy, and Even if air bubbles are mixed into the liquid by stirring with the liquid and air in the chamber, the bubbles are prevented from moving downward by the partition wall, so it is difficult for the bubbles to flow to the lower chamber side, and even to the cylinder side. It says that the situation can be avoided.

[0006]

However, in the master cylinder having the above-described structure, the partition wall that divides the inside of the tank into upper and lower parts is formed by an integral member, and this member is directly fitted into the circular recess formed in the bottom of the reservoir tank. Since the configuration described above is adopted, the work of fitting the bowl-shaped member into the recess of the tank is troublesome, and the bowl-shaped member may come off the circular recess due to violent vibration. Furthermore, if the accuracy of the contact surfaces between the bowl-shaped member and the recess is poor, the sealing structure will be insufficient, so when the reservoir tank tilts and the air surface comes into contact with this sealing portion, this There has been a problem that air may be mixed into the bowl-shaped member encapsulation from the seal portion.

Therefore, an object of the present invention is to solve the above-mentioned problems by adopting a structure in which a partition wall for partitioning the inside of the tank into upper and lower parts is attached to a recess at the bottom of the tank through a seal member.

[0008]

Therefore, according to the present invention, a partition device for vertically partitioning the inside of a reservoir tank having a port 5 communicating with a pressure generating chamber 4 for generating a liquid pressure is provided in a bottom portion. In the reservoir tank provided with 11, the device 11 has a structure in which the upper and lower chambers 14, 15
A bowl-shaped partition wall 12 and a seal member 13 that fits in a recess 10 formed in the bottom of the reservoir tank while holding the bowl-shaped partition wall 12 surrounding the bowl-shaped partition wall 12. A reservoir tank is characterized in that a hole 12a communicating with the chambers 14, 15 is provided, and this is a means for solving the problem.

[0009]

Since the bowl-shaped member 12 for partitioning the upper and lower parts is attached through the seal member 13 in the bottom recess 10 of the reservoir tank, the bowl-shaped member 12 can be mounted easily and exposed to severe vibration during traveling. However, it is possible to prevent the inconvenience that the seal member 13 comes off from the recess.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a reservoir tank according to the embodiment of the present invention. In the figure, reference numeral 1 denotes a reservoir tank main body, and a cylinder 2 is integrally formed in a lower portion of the main body 1, and a pressure generating chamber 4 for generating a pressure by a movement of a piston 3 is formed in the cylinder 2. Has been done. The pressure generating chamber 4 communicates with the reservoir tank 1 via a port 5 formed on the bottom surface of the reservoir tank, and an operating lever (not shown) is operated to push the piston 3 to the left in the drawing via a push rod 6. When moved, the communication between the reservoir tank 1 and the pressure generating chamber 4 is cut off, and a hydraulic pressure is generated in the pressure generating chamber 4. The push rod is in contact with the piston via the spherical head so that the rod can be tilted with respect to the axis. Further, the piston is a spring 4 arranged in the pressure generating chamber 4.
It is always urged to the right in the figure by a. Further, 7 is a stopper, 8 is a stopper ring for fixing the stopper, and 9 is a stopper ring.
Is boots.

A circular recess 1 is formed in the inner bottom of the reservoir tank 1.
0 is formed, and a partition device 11 is provided in the circular recess 10.
Are arranged, thereby partitioning the inside of the reservoir tank into two chambers 14, 15 which are an upper chamber and a lower chamber. The device 11 is shown in FIG.
As shown in FIG. 3, a bowl-shaped partition wall 12 that is convexly curved upward,
It is composed of a seal member 13 that fits around the bowl-shaped partition wall 12 and that fits into a circular recess 10 formed in the bottom of the reservoir tank. Communication hole 12 that communicates the partitioned chambers 14 and 15
a is formed. In the upper chamber 14 partitioned by the bowl-shaped partition 12, not only the brake fluid but also air mixed when the brake fluid is injected is sealed, and the lower chamber 15 is connected to the pressure generating chamber 4 via the port 5. Is in communication with.

In the master cylinder having such a structure, since the reservoir tank 1 is divided into upper and lower parts by the partition device 11, the air mixed when the brake fluid is injected is separated only into the upper chamber 14 by its buoyancy. Also,
Even if air bubbles are generated in the brake fluid by stirring the brake fluid and air in the upper chamber 14 due to vibration during traveling, the bubbles flow into the lower chamber 15 because their movement is hindered by the bowl-shaped partition wall 12. It is possible to prevent bubbles from flowing into the pressure generating chamber 4 much less. Further, the seal member 13 is provided in the bottom surface recess 10 of the reservoir tank.
Since the bowl-shaped member 12 that divides the bowl into upper and lower parts is attached through the structure, the work of attaching the bowl-shaped member 12 is facilitated, and the seal member 13 is dislocated from the recess even when exposed to intense vibration during traveling. Disappears.

[0013]

As described in detail above, according to the present invention,
Since the seal member that constitutes the partition device is fitted in the recess of the reservoir tank, and the bowl-shaped member that divides the inside of the reservoir tank into the upper and lower chambers is attached to this seal member, the bowl-shaped member is formed in the recess on the bottom surface of the reservoir tank. The fitting work is simple, and on the other hand, even if it is exposed to severe vibration during traveling, the sealing member fits securely in the recess, so there is no inconvenience that the sealing member and the bowl-shaped member come off from the recess. In addition, since the seal member is fitted into the recess of the reservoir tank securely, it is possible to prevent air from entering the lower compartment through the seal surface.

[Brief description of drawings]

FIG. 1 is a sectional view of a reservoir tank according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view (a cross-sectional view taken along the line AA in FIG. 3) of the partition device mounted on the bottom surface of the reservoir tank of FIG.

FIG. 3 is a plan view of FIG. 2;

[Explanation of symbols]

 1 Reservoir tank 2 Cylinder 3 Piston 4 Pressure generating chamber 5 Port 6 Push rod 7 Stopper 10 Bottom recess 11 Partition wall device 12 Bowl-shaped partition wall 13 Sealing member 14 Upper chamber 15 Lower chamber

Claims (1)

[Claims] 1. A reservoir tank in which a partition device 11 for vertically partitioning the interior of a reservoir tank having a port 5 communicating with a pressure generating chamber 4 for generating a liquid pressure is provided in the bottom portion. The device 11 is composed of a bowl-shaped partition wall 12 that divides the inside of the tank into upper and lower chambers 14 and 15, and a seal member 13 that holds the periphery of the bowl-shaped partition wall 12 and fits into a recess 10 formed in the bottom of the reservoir tank. Further, a reservoir tank characterized in that a hole 12a for communicating the upper and lower chambers 14 and 15 is provided at the top of the bowl-shaped partition wall.