JPS5843481Y2 - tandem master cylinder - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a tandem mask cylinder equipped with a reservoir.

For example, in vehicle brake systems, there is a tendency for two independent brake systems to be operated by the same mask cylinder, and in this case, so-called tandem mask cylinders (hereinafter simply referred to as mask cylinders) are used.

Furthermore, as a reservoir that is attached to this mask cylinder and stores oil, there is a tendency to adopt a single integrated reservoir having two oil supply ports in the axial direction of the mask cylinder.

On the other hand, for convenience of oil supply, the reservoir is generally placed above the mask cylinder, so the piping outlet for supplying oil from the mask cylinder to the brake is necessarily located above the mask cylinder. Either on the left or right side or on the bottom.

Therefore, in the former case, it is necessary to form the piping outlet on either the left or right side of the mask cylinder depending on whether the vehicle is a right-hand drive or a left-hand drive vehicle, and as a result, two types of cylinder bodies are formed.

On the other hand, although the latter method does not have the above-mentioned drawbacks, since the air inside the mask cylinder cannot escape, it is necessary to separately provide a bleeder, resulting in an increase in cost.

The present invention was developed with the aim of solving the above problems.

Specific examples will be explained below based on the drawings.

The cylinder body 1 has an oil supply port 2 along its axial direction from a reservoir 10 to be described later into the cylinder body 1.
Bosses 2, 2 for attaching reservoirs, and cylinder body 1
2 as an oil fluid supply port from to the vehicle wheel cylinder.
A take-out boss 3°3 is provided on the upper side thereof, that is, on the side where the reservoir 10 is attached.

The rest of the structure of the cylinder body 1 is the same as that of a known mask cylinder, and the whole body is constructed by disposing a known piston for a mask cylinder inside the cylinder body.

Elastic seal members 4, 4 are fitted into the bosses 2, 2, and the reservoir 1 is inserted into the through holes 5, 5 of the elastic seal members 4, 4.
Nipple IL11 protruding downward from 0 is fitted,
The reservoir 10 is fixed to the cylinder body 1.

In addition to this example, various connection structures are known for the connection structure between the cylinder body 1 and the reservoir 10, and the reservoir may be connected using any of these connection structures.

In short, the present invention exists in that the bosses 3, 3 for taking out the pipes are provided upwardly protruding from the cylinder body 1, and the reservoir 10 is constructed as described below, and the connection structure between the reservoir and the cylinder body is Any form itself is sufficient.

A seat tube 7 having a through hole 7a is arranged inside the bosses 3, 3, and the seat tube 7 is tightened with a plug 8 having a screw hole 8a in the center.

As shown in FIGS. 1 and 2, the reservoir 10 connects the front and rear oil chambers 13 and 14, which are formed directly above the boss 2 with one boss 3 in between, through a connecting passage 12. It's becoming easier to communicate.

This connecting passage 12 is provided so as to be located outside a space 15 for taking out piping such as a cytotube from the boss 3 (supply port) upwardly from the boss 3. There is.

Further, the cross-sectional area of the communication passage 16 formed in the connection passage 12 is set to be extremely small compared to that of the oil chambers 13 and 14, thereby preventing sudden liquid movement between the oil chambers 13 and 14. .

As a result of forming as described above, the oil chamber 1
3 and 14 are in communication.

A wall 17 is vertically provided in the communication passage 16, and the interaction between this wall 17 and the communication passage 16 formed as described above allows the oil chamber 13 to be closed when making a sudden start or stop, or when traveling on a slope. Even if the liquid level is tilted by 14°, malfunction of the liquid level detection device 20, which will be described later, can be prevented.

A cylindrical member 21 whose lower end is blank is extended from the upper wall 14a of the oil chamber 14, and a magnet 2 is installed inside the cylindrical member 21.
A reed switch 22 which constitutes a detection means for detecting the displacement of the float 24 in cooperation with the cylindrical member 21 is disposed, and a float 24 having a magnet 23 inside is slidably inserted into the outside of the cylindrical member 21. A liquid level detection device 20 is formed, and a signal is taken out to an alarm device 26 through a lead wire 25 connected to a node switch 22.

27 is a sealing member that holds the lead wire 25 and
Rainwater is prevented from entering the inside of the cylindrical member 21.

An opening 28 is provided in the clay wall of the reservoir 10 forming the other chamber 13, and an inner lid 30 and an outer lid 31 are provided to seal the opening 2B with a sealing member 29.

The oil is injected into the reservoir 10 through this opening 28 .

In addition, in the case of this example, the reservoir 10 is made into an upper mold 10a and a lower mold 10a, which are formed separately with an inclined seam line 32 as a boundary, and are fused together at this seam line 32. It is something.

As shown in FIG. One boss 3 for a pipe outlet protruding from the reservoir 10 is located in a space 15 extending upward beyond the earthen wall of the reservoir 10, and the other boss is separated from the reservoir space 15 and boss 3. The protruding position of -3 is determined in advance, and the reservoir 10 and the cylinder body 1 are attached.

Thereafter, as shown in FIG.
2 to the plug 8 and its end to the flare nut 3.
4 is tightened to the plug 8, the piping 33 is positioned in the space 15, and the piping is connected to the other boss 3 in the same manner, and the device is ready for use.

FIG. 4 shows another example of the present invention. The reservoir is communicated with the oil chambers 13, 14 by two connecting passages 12, 12,
The space 15 is located surrounded by these connecting passages.

The other configurations are formed in the same manner as in the previous example.

According to the present invention configured as described above, the oil supply port to the brake system is aligned in the same direction as the reservoir mounting part, which facilitates workability, and the oil supply port is located above the cylinder body. , the air in the cylinder body passes through the pipe and escapes from the bleeder on the wheel cylinder side, making it easier to bleed the air.

Furthermore, since the two oil chambers of the reservoir are in communication, the liquid level detection device only needs to be provided in one of the oil chambers, which can be manufactured at a correspondingly low cost.

In the mask cylinder of the present invention, among the two oil chambers formed directly above the oil supply ports from the reservoir to the mask cylinder, one oil chamber is provided with a liquid level detection device, and the other oil chamber is provided with a liquid level detection device, and the other oil chamber is provided with a liquid level detection device. Since the oil chamber is connected to an opening that is closed with a lid, when replenishing oil to the reservoir, it is possible to do so through the opening with the lid removed, without having to take out the liquid level detection device from the oil chamber. As a result, it is possible to eliminate oil droplets that occur when the liquid level detection device is taken out and to prevent staining of the surrounding area due to the oil droplets, and it is possible to replenish the oil liquid with a simple operation and without difficulty.

In addition, in the mask cylinder of the present invention, in which the liquid level detection device consisting of a float is disposed in one of the two oil chambers spaced apart as described above, the liquid level detection device is arranged in the connecting passage communicating with both oil chambers. The cross-sectional area of the communication passage formed in the oil chamber is set to be extremely small compared to the cross-sectional area of each of the two oil chambers in order to prevent rapid liquid movement between the two oil chambers.
It is possible to eliminate large instantaneous liquid level fluctuations when a vehicle suddenly starts or stops or runs on a slope, it is possible to eliminate malfunctions of the detection means for detecting the displacement of the float, and it is also possible to enlarge the extraction space. At the same time, the width of the connecting passage can be made small, so that the width occupied by the connecting passage can be made approximately equal to the width occupied by the cylinder body, and the whole can be made compact.

Moreover, according to the mask cylinder of the present invention, since the extraction space extends upward beyond the earthen wall of the reservoir, one of the second oil supply ports can be accessed from directly above through the extraction space. As a result of being able to connect the piping to the oil supply port, it is possible to easily perform the air bleeding operation, and the piping can be connected to both the right bundle and the left bundle of vehicles with a simple structure.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of the present invention, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, Fig. 3 is a sectional view taken along the line I-I in Fig. 1, and Fig. 4 is the same as Fig. 2. This is a cross-sectional view showing only the main parts of another example of the present invention. 1...Cylinder body 10...Reservoir, 12...Connection passage, 13.14...
...Oil room, 15... Space.

Claims (1)

[Scope of utility model registration request] The first two fluid supply ports from the reservoir to the mask cylinder and the second two from the mask cylinder to the wheel cylinder.
In a tandem mask cylinder in which a reservoir is installed in a cylinder body having two oil supply ports, the first and second oil supply ports are arranged alternately along the axial direction of the cylinder body. forming an oil chamber in the reservoir directly above each of the first oil supply ports with one of the second oil supply ports in between; A connecting passage that communicates the two oil chambers in the reservoir is provided so as to be located outside the extraction space of one of the second oil supply ports, and one of the two oil chambers A liquid level detection device consisting of a float and a detection means for detecting the displacement of the float is arranged in one of the oil chambers, and the earthen wall of the reservoir forming the other of the two oil chambers is closed with a lid. In order to prevent rapid liquid movement between the two oil chambers, the cross-sectional area of the communicating passage formed in the connecting passage is compared to the cross-sectional area of the two oil chambers. The extraction space is set to be extremely small, and the extraction space is extended upwardly beyond the earthen wall of the reserve on the one hand, and extends to the one of the second oil supply ports on the other hand. Tandem master cylinder.