JPH04104067U - Reservoir for master cylinder - Google Patents

Abstract

(57) [Summary] [Purpose] To facilitate the supply of working oil to the reservoir body and to reliably prevent the working oil from leaking from the reservoir body through the breather passage. [Configuration] The lower end is open to the lower surface of the cap 2 that closes the cap attachment part 12 of the reservoir body 1, and the upper end is connected to the top plate 2.
A pipe-like protrusion 25 is provided which is closed by a pipe-like protrusion 8, and an atmospheric air introduction hole 29 is provided in the upper side wall of the pipe-like protrusion 25, which communicates with the outside through the notches 35 and 36 of the cap 2. The working oil that has entered the pipe-like protrusion 25 collides with the top plate 28 and falls into the reservoir body 1, and is prevented from leaking to the outside through the atmosphere introduction hole 29. Replenishment of operating oil to the reservoir body 1 is carried out through a pipe-shaped protrusion 25 that is integrated with the cap 1.
After removing the oil, it is carried out through the large-area oil supply hole 15. A filter can be attached to the air introduction hole 29.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is a master system for supplying pressure oil to vehicle brake and clutch devices. This invention relates to a master cylinder reservoir connected to a cylinder.

0002

[Conventional technology]

As such a reservoir for a master cylinder, for example, Japanese Utility Model Application Publication No. 59-167760 Those described in gazettes are publicly known. The cap of the above reservoir is attached to the reservoir body. A synthetic resin cap bolt that can be attached and detached from the cylindrical cap attachment part formed on the top. and a periphery of the opening of the cap mounting portion supported inside the cap body. Consists of a rubber seal cap that seals the edges. And the reservoir body A circular oil supply hole is formed in the center of the bottom of the cap mounting part, and At the bottom of the seal cap, multiple air inlet holes are arranged eccentrically from the oil supply hole. is formed. This allows you to access the oil supply hole by removing the cap. It is possible to replenish the operating oil inside the reservoir body, and the cap can also be attached. In this condition, the oil supply hole and the atmosphere introduction hole are placed eccentrically to each other. , communicates the inside of the reservoir with the atmosphere while preventing leakage of hydraulic oil to the outside. be able to.

0003

[Problem that the idea aims to solve]

However, the conventional master cylinder reservoir described above has oils that are eccentric to each other. The labyrinth effect of the oil supply hole and the air intake hole prevents oil leakage. Ensure that the diameter of the oil supply hole is sufficiently large to ensure prompt oil replenishment. In this case, the labyrinth effect is reduced and the working oil tends to leak easily.

0004 This invention was made in view of the above-mentioned circumstances, and the area of the oil supply hole is sufficiently large. Master cylinder that can reliably prevent leakage of operating oil while ensuring The purpose is to provide a reservoir for

[0005]

[Means to solve the problem]

In order to achieve the above object, the present invention provides a reservoir connected to the master cylinder. A mass formed by closing the cap attachment part formed on the top of the main body with a removable cap. In a reservoir for a cylinder, the pipe-like part is closed at the upper end and open at the lower end. A protrusion is provided on the lower surface of the cap to protrude downward from the upper end of the pipe-like protrusion. The first feature is that an atmosphere introduction hole communicating with the atmosphere is formed in the spaced side wall.

[0006] In addition to the above-mentioned first feature, the present invention also provides a filter for attaching a filter to the air introduction hole. This is the second characteristic.

[0007]

【Example】

Embodiments of the present invention will be described below based on the drawings.

[0008] Figures 1 and 2 show a first embodiment of the present invention, with Figure 1 being a partial section of the reservoir. A top view, FIG. 2 is a diagram showing a cap mounting portion of the reservoir.

[0009] As shown in Figure 1, the reservoir R is a reservoir body made of a hollow synthetic resin container. 1, and a cap 2 that is removably attached to the top of the cap. Cap body 3 made of synthetic resin, seal cap 4 made of synthetic resin, and rubber It is composed of three members: the packing 5.

0010 Three reinforcing protrusions 6, 7, 8 and two mounting parts 9 and 10 are formed, and furthermore, the master of the brake device is formed at the bottom of the mounting parts 9 and 10. A joint portion 11 that is connected to the cylinder via a hose is provided in a protruding manner. Reservoir body 1 A cylindrical cap mounting part 12 for mounting the cap 2 is integrated on the top surface. The inner periphery serves as an oil supply for injecting oil into the reservoir body 1. A feed hole 15 is defined.

[0011] As is clear from FIGS. 1 and 2, the cap body forming the outer shell of the cap 2 The D 3 has a side wall 17 connected to the peripheral edge of the circular top wall 16, and the side wall 17 has an L Two hook portions 18 bent in a letter shape are provided to protrude downward. Also, the cap mounting part 12 A flange 19 protruding outward from the upper edge has a flange 19 for allowing the hook portion 18 to pass vertically. Two notches 20 are formed, and a cover is connected to each notch 20. A bump surface 21 and a locking step 22 are formed along the lower surface of the flange 19.

0012 The outer periphery of the seal cap 4 is an annular shape formed on the inner periphery of the side wall 17 of the cap body 3. The seal cap 4 is engaged with the groove 23 of the cap body 3. It is held so that it does not fall out from inside. A pad protruding from the bottom of the seal cap 4 A ring-shaped packing 5 is fitted into the support part 24, and the cap 2 is fitted into the reservoir. In the state shown in Fig. 1 attached to the bar body 1, the upper end of the cap mounting part 12 and the seal cap are connected to each other. The packing 5 is held under pressure between the caps 4.

[0013] A pipe-shaped projection 25 is integrally provided vertically at the center of the lower surface of the seal cap 4. pa A through hole 26 formed inside the tubular projection 25 has the oil supply hole 1 at its lower end. It has an opening 27 located in the center of 5, and its upper end is closed by a top plate 28. blocked. At a position slightly below the top plate 28 on the side wall of the pipe-shaped protrusion 25, there is a An air introduction hole 29 is formed, and the opening 27, the through hole 26, and the air introduction hole 29 are connected to each other. The inside of the reservoir body 1 and the upper surface of the seal cap 4 communicate with each other through the reservoir body 1.

[0014] The upper surface of the seal cap 4 is provided in cooperation with the lower surface of the top wall 16 of the cap body 3. Three annular protrusions 30, 31, 32 forming a labyrinth surround the pipe-shaped protrusion 25. The annular protrusions 30, 31, and 32 are provided with two concentric protrusions. Reservoirs 33, 34 are formed. Then, the upper surface of the seal cap 4 and the cap The space defined by the lower surface of the body 3 is located on the inner periphery of the side wall 17 of the cap body 3. The notches 35 and 36 formed communicate with the atmosphere.

[0015] Next, the operation of the first embodiment of the present invention having the above-described configuration will be explained. To attach the cap 2 to the reservoir body 1, use the two hooks on the cap body 3. 18 into the two notches 20 of the cap mounting part 12, then insert the cap 2. Rotate clockwise. Then, the hook portion 18 climbs over the cam surface 21 and engages the locking step. The cap 2 is stably engaged with the portion 22, and the cap 2 is under a downward set load. It is fixed to the cap mounting part 12. Note that in order to remove the cap 2, use the hook portion 18. counterclockwise while pressing the cap 2 downward so that it separates from the locking step 22. Just rotate it in the direction.

[0016] When the cap 2 is attached to the reservoir body 1 as described above, its packing 5 is pressed between the upper end of the cap mounting portion 12 and the outer periphery of the seal cap 4. As a result, the inside of the reservoir body 1 is exposed to the pipe-shaped protrusion formed on the seal cap 4. 25 opening 27, through hole 26, atmosphere introduction hole 29, annular projection 30 of seal cap 4 , 31, 32, and the side wall 17 of the cap body 3. Only through the breather passage formed by the notches 35 and 36 formed on the inner periphery of the It communicates with the atmosphere and compensates for changes in the internal pressure of the reservoir R due to changes in the oil level of the working oil. It will be done. In this case, the dust in the air that has flowed onto the seal cap 4 is collected in the dust traps 33 and 3. 4 and is held therein, thereby preventing entry into the atmosphere introduction hole 29.

[0017] If the surface of the hydraulic oil ripples due to vehicle vibration, etc., the hydraulic oil may Although there is a risk of leakage to the outside through the breather passage, The working oil that has entered the inside of the through hole 26 rises along the inner wall of the through hole 26. and collides with the top plate 28, and is returned to the inside of the reservoir body 1 again. At this time, the through hole 26 Some of the working oil that has entered the inside of the seal cap is Even if the operating oil reaches the three annular projections 30, 31, 32, be prevented by the labyrinth formed and retained in the dust reservoirs 33 and 34. This prevents leakage from the notches 35 and 36 of the cap 2 to the outside.

[0018] In addition, the oil level of the hydraulic oil inside the reservoir body 1 may be tilted due to the tilt of the vehicle, etc. In this case, the center part of the reservoir body 1 has the smallest fluctuation in the oil level compared to the outer periphery. Although it is small, the opening 27 at the lower end of the pipe-shaped protrusion 25 vertically provided on the lower center surface of the cap 2 is located in a portion where the fluctuation in the height of the oil level is small, so the pipe-shaped protrusion 25 Operating oil is prevented from entering the inside of the through hole 26.

[0019] To replenish the hydraulic oil to the reservoir R, remove the cap 2. This is done through the cap mounting part 12, but it is formed by the inner periphery of the cap mounting part 12. Since the oil supply hole 15 has a sufficiently large opening area, the oil supply hole 15 has a sufficiently large opening area. Supply work can be performed quickly and easily.

[0020] FIG. 3 shows a second embodiment of the present invention, in which the seal cap 4 is A mesh filter 37 is attached to the air introduction hole 29 of the girder pipe-like projection 25. The rest of the structure is the same as that of the first embodiment described above.

[0021] According to this second embodiment, air or working oil flows through the pipe-shaped projection 2. When the air enters and exits through the air introduction hole 29 of No. 5, the air contained in the air or the working oil The filter 37 filters the dust that enters the reservoir body 1 to prevent it from entering the reservoir body 1. I can do that. Moreover, the hydraulic oil that has entered the through hole 26 of the pipe-like protrusion 25 is Since the operating oil cannot easily pass through the shoe-shaped filter 37, This can be more effectively prevented from reaching the upper surface of the seal cap 4.

[0022] Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments. However, various modifications may be made without departing from the present invention as stated in the claims for utility model registration. It is possible to make minor design changes.

[0023] For example, the reservoir R in the embodiment is provided separately from the master cylinder. However, this invention can also be applied to a reservoir integrated with the master cylinder. be.

[0024]

[Effect of the idea] As described above, according to the first feature of the present invention, the cap mounting portion of the reservoir body The inside of the reservoir body communicates with the atmosphere while the reservoir is closed with a cap. The hydraulic oil that enters from the opening at the bottom of the pipe-like projection is blocked by the blockage at the top. As it falls into the reservoir body again, the hydraulic oil hits the lower side wall of the blockage. It is possible to effectively prevent leakage to the outside from the formed atmosphere introduction hole. Moreover, the above Since the pipe-like protrusion is provided on the cap, it is necessary to use the key to supply operating oil. Once the cap is removed, there will be no obstructions in the area where the cap is installed, allowing the operating oil to flow. This makes it possible to easily and quickly carry out the work of supplying oil.

[0025] Further, according to the second feature of the present invention, the pipe-shaped protrusion has a pipe provided in the air inlet hole. The filter not only prevents external dust from entering the reservoir body, but also Because the hydraulic oil cannot easily pass through the filter, Leakage can be prevented even more effectively.

[Brief explanation of drawings]

[Fig. 1] Partial cross-sectional view of a reservoir according to the first embodiment

[Figure 2] Diagram showing the cap attachment part of the reservoir

[Fig. 3] Partial cross-sectional view of the reservoir according to the second embodiment.

[Explanation of symbols]

1...Reservoir body 2...Cap 12...Cap attachment part 25...Pipe-shaped protrusion 29...Atmospheric introduction hole 37...filter

Claims (2)

[Scope of utility model registration request] Claim 1: A reservoir for a master cylinder in which a cap attachment part (12) formed at the upper part of a reservoir body (1) connected to a master cylinder is closed with a removable cap (2), the upper end of which is closed. A pipe-shaped protrusion (25) with an open lower end is provided to protrude downward from the lower surface of the cap (2), and an air inlet hole (25) communicating with the atmosphere is provided in a side wall spaced downward from the upper end of the pipe-shaped protrusion (25). 2
9) A reservoir for a master cylinder, characterized in that it is formed with: [Claim 2] A filter (3) is provided in the air introduction hole (29).
7). The master cylinder reservoir according to claim 1, wherein the master cylinder reservoir is equipped with: 7).