JPH024854Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial application field] This invention is useful when maintaining the brake system of an automobile.
In particular, the present invention relates to an oil leak prevention device that prevents brake system oil from leaking during disassembly and maintenance of brake hydraulic cylinders.

[Prior Art] That is, in the brake system of an automobile as shown in FIG. 1, in order to disassemble the brake hydraulic cylinder (also called a wheel cylinder) 1, it must be removed from the brake system piping 2. However, when the brake hydraulic cylinder 1 is removed, the oil in the brake system flows out from the connection port, and the corresponding amount of air enters the brake system. When there is a lot of air, air also enters the hydraulic pump 4 (also called a master cylinder) that applies hydraulic pressure with the brake pedal 3, and the oil leaks out to the extent that the reserve tank 5 that stores brake oil becomes empty. Sometimes there is only air in the brake system.

[Problem that the invention aims to solve] If air enters the brake system of a car, the air will be compressed and the oil pressure will not increase even if the brake pedal 3 is pressed, so the brakes will not be applied, resulting in a very dangerous situation. , is shunned. In particular, if air enters the hydraulic pump 4, it will not come out easily. Currently, air bleeding work is done in teams of two, with one person stepping on the brake pedal 3 to apply hydraulic pressure, and the other person loosening the air bleeding screw near the brake hydraulic cylinder 1 several times. Although we are trying to do this by repeating the problem repeatedly, the reality is that it is difficult to get rid of it completely.

Furthermore, if the oil spills, it will stain the floor of the workplace and impair work efficiency. In particular, if spilled oil adheres to the brake lining, there is a risk that the brakes will not work.

Therefore, an oil leak prevention device disclosed in Japanese Utility Model Publication No. 47-29612 has been proposed. This device includes an inverted cone-shaped shielding suction cup that is in close contact with the upper end of the reserve tank, and a pipe that extends into the reserve tank when the shielding suction cup is in close contact with and in contact with the upper end of the reserve tank. A suction device such as a compressor is generally connected to this piping, and the suction force of the compressor maintains the inside of the reserve tank at an appropriate negative pressure state, and also maintains the shielding suction cup and the reserve tank in close contact.

However, it is difficult to control the compressor using this device to maintain a negative pressure state in the reserve tank to the extent that oil does not leak during maintenance. There were problems such as oil leaking from the brake system and oil leaking from the brake system. Additionally, the work of connecting and controlling large equipment such as a compressor during maintenance is considered complicated, so it is desired to develop a device that can perform maintenance work easily and maintain an appropriate negative pressure state within the reserve tank. was.

This invention was made to solve the above-mentioned problems, and the purpose of this invention is to easily and quickly attach it to reserve tanks of all diameters, and airtightly, when servicing the brake system of a car. The purpose is to easily prevent brake system oil from leaking out due to gravity by creating an appropriate negative pressure state in the reserve tank to the extent that oil does not leak out.

[Means for Solving the Problems] In order to achieve the above object, the present invention has the shape of an airtight container that can be contracted and expanded, and is contracted by an external force, and when the external force is released, it expands and returns to its original shape. At the same time, a variable container member is provided with an opening at its lower end for letting internal air in and out; a shielding suction cup having a downwardly convex substantially hemispherical shape that can be brought into close contact with and in contact with the variable volume member, and having an intake hole that communicates between the inside of the reserve tank that is in close contact with and in contact with the variable volume member, and the variable volume member or the shielding suction cup. It consists of a weight member that is integrally provided with the variable volume member and allows the shielding suction cup to remain in close contact with the upper end edge of reserve tanks of various diameters by its own weight. This is an oil leak prevention device during the brake system that allows the air in the reserve tank that is in close contact with the compressor to be sucked in through the intake hole.

[Function] According to the oil leakage prevention device of the present invention, the shielding suction cup and the reserve tank can be connected by simply placing the downwardly convex, substantially hemispherical shielding suction cup in contact with the upper end opening of the reserve tank from which the cap has been removed. The upper end mouth edge portion will be in close contact with and abut. In other words, the shielding suction cup can be brought into close contact with the reserve tank, which has a different opening diameter depending on the vehicle model, model year, etc., and can be used for all diameters when servicing the automobile brake system. It is also possible to easily and quickly attach it to a reserve tank in an airtight manner.

In addition, when this device is placed so that the shielding suction cup is in contact with the upper end edge of the reserve tank, the variable volume member or the shielding suction cup is integrally equipped with a weight member, so that the weight of the device will cause the shielding suction cup to This will ensure that the upper end edges of the reserve tank are kept in close contact with each other. Therefore, if the variable volume member is contracted and the shielding suction cup is brought into close contact with the upper edge of the reserve tank, the restoring force of the variable volume member will cause the air in the reserve tank to flow through the intake hole. It is possible to create an appropriate negative pressure state in the reserve tank to prevent oil from leaking. This makes it possible to easily prevent oil from leaking into the brake system due to gravity during maintenance of the brake system.

[Example] Next, this invention will be explained with reference to an example shown in FIGS. 2 and 3.

In the figure, 10 is a variable volume member that can be freely contracted and expanded;
Reference numeral 1 denotes a weight member 12 which is airtightly joined and attached to cover the lower end opening 10a of the variable volume member 10;
is a shielding suction cup that is attached to the lower surface of the weight member 11 and that airtightly adheres to the upper end edge of the reserve tank 5 with the cap covering the upper end opening removed;
13 is a finger hook member attached to the weight member 11; 14 is a restoring spring that contributes to the expansion of the variable volume member 10 and thus to restoring it to its original shape; and 15 is an intake hole.

The variable volume member 10 is in the shape of a bellows-shaped airtight container with a closed upper end, and expands and contracts by expanding and contracting in the vertical direction like a bellows. It is oil resistant and
Made of highly elastic rubber or synthetic resin, it is easily compressed and contracted by hand, but due to the inherent elasticity of the material, it expands (expands) and returns to its original shape under its own power. It is configured.
The restoring spring 14 is a compression spring for assisting the expansion and restoring action of the variable volume member 10, and is installed between the upper surface of the weight member 11 and the upper end surface of the variable volume member 10. There is. However, this is unnecessary when the restoring force (elasticity) of the variable volume member 10 is sufficiently large.

When the oil leakage prevention device according to this embodiment is placed on the upper opening of the reserve tank 5 with the cap removed (see FIGS. 2 and 3), the weight member 11
This is to improve the adhesion between the shielding suction cup 12 and the upper edge of the reserve tank 5 and to provide stability in use. Therefore, the weight member 11 is
The oil leak prevention device is required to have an appropriate weight to meet its purpose, and is generally made of iron or other metal. The lower end opening 10a of the variable volume member 10 is
It fits and is joined to the upper edge 11a of the weight member 11.

The shielding suction cup 12 is formed of soft and elastic rubber so that it can be easily adsorbed airtightly to the upper end edge of the reserve tank 5 from which the cap covering the upper end opening has been removed, and is attached to the lower surface of the weight member 11 to be integrally attached. It is being This shielding suction cup 12 is formed into a substantially hemispherical shape (indicated by two solid lines in FIG. 3) convex downward, and the part that comes into contact with the mouth edge of the reserve tank 5 is slightly deformed to fit well and maintain airtightness. hold. In other words, the shielding suction cup 12 can be easily applied to reserve tanks 5 having different diameters of the upper end opening depending on the car model, model year, etc., and can be placed on the reserve tank 5 with the cap removed. Simply by mounting such an oil leak prevention device, the surface of the suction cup 12 and the upper end edge of the reserve tank 5 will come into close contact and contact. The intake hole 15 commonly passes through the center of the weight member 11 and the shielding suction cup 12, and
It communicates with the chamber 10b.

This oil leak prevention device hooks two fingers, for example, the index finger and the ring finger, on the finger hook members 13, 13, presses and compresses the variable volume member 10 with the remaining thumb, and caps the shielding suction cup 12 in a contracted state. Contact the top edge of the removed reserve tank 5,
After that, release your thumb. Then, variable volume member 1
0 expands and expands by its own force, that is, by the inherent elasticity of the material, or with the help of the restoring spring 14, and returns to its original shape (the shape before compression). In such a case, as the variable volume member 10 expands and its volume increases, the air in the reserve tank 5 is sucked in through the intake hole 15, and the pressure in the reserve tank 5 is gradually lowered to a negative pressure state below atmospheric pressure. ,
A vacuum suction force is exerted on the oil in the brake system from the throat portion 5a of the tank 5 through the oil surface in the reserve tank 5. When the vacuum suction force exceeds a certain level, the oil in the brake system can be prevented from flowing out due to its gravity.

Note that the variable volume member 10 is not limited to the above bellows shape as long as it provides the same effects as described above. For example, it may have a ball shape or other shapes.

Next, the operation of the above embodiment will be explained.

According to the oil leak prevention device according to the above embodiment, the shielding suction cup 12, which is convex downward and has a substantially hemispherical shape, is attached to the upper end opening of the reserve tank 5 with the cap removed.
By simply placing the shielding suction cup 12 so that they are in contact with each other, the shielding suction cup 12 and the upper end edge of the reserve tank 5 will come into close contact with each other. In other words, the shielding suction cup 12 can be brought into close contact with and in contact with the reserve tank 5, which has a different opening diameter depending on the vehicle model, model year, etc. It becomes possible to easily and quickly and airtightly attach it to the reserve tank 5 of the same diameter. In addition, the oil leak prevention device according to the above embodiment,
A weight member 1 is attached to the variable volume member 10 and the shielding suction cup 12.
1 are integrally attached, so that when this device is placed on the upper opening of the reserve tank 5, its own weight can maintain better adhesion between the shielding suction cup 12 and the upper opening edge of the reserve tank 5. I can do it. Therefore, if the variable volume member 10 is in a contracted state and the shielding suction cup 12 is brought into close contact with the upper edge of the reserve tank 5, the restoring force of the variable volume member 10 will cause the air in the reserve tank 5 to The oil is sucked in through the intake hole 15, and the inside of the reserve tank 5 can be brought into an appropriate negative pressure state to the extent that oil does not leak out. This makes it possible to easily prevent oil in the system from leaking out due to gravity during maintenance of the brake system.

[Effects of the invention] As described above, this invention is based on the oil leakage prevention device having the above-mentioned configuration, and therefore has the following effects.

To easily and reliably prevent brake system oil from flowing out due to its gravity.

Therefore, it is possible to prevent air from entering the brake system, and there is no need for troublesome air purge work.

It is compatible with various reserve tanks that have different diameters of the top opening depending on the car model and model year.Simply place this device on the rim of the top opening of the reserve tank so that the shielding suction cup is in contact with the rim of the top opening. It can be installed airtight using its own weight.

Furthermore, it is possible to prevent leaked oil from staining the floor or adhering to the brake lining.

Therefore, maintenance of the brake system, especially disassembly and maintenance of the brake hydraulic cylinder, can be easily performed, and reliability after maintenance is significantly improved.

It has an extremely simple configuration, can be manufactured at low cost, and can be easily used without using large equipment such as a compressor that is complex to control.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing the brake system of an automobile.
FIG. 2 is a perspective view showing the oil leak prevention device of this invention, and FIG. 3 is a sectional view of the same. 10... Variable volume member, 5... Reserve tank, 11... Weight member, 12... Shielding suction cup, 15...
...Intake hole.

Claims (1)

[Claims for Utility Model Registration] Shaped as an airtight container that can be contracted and expanded, it is contracted by an external force, expands and returns to its original shape when the external force is released, and has an opening at the lower end that allows internal air to enter and exit. a downwardly convex substantially hemispherical member that is attached to the variable volume member so as to cover the mouth portion, and whose lower end portion can be brought into close contact with the upper end mouth edge of reserve tanks of various diameters. a shielding suction cup having an intake hole that communicates between the inside of the reserve tank and the variable volume member that are in close contact with each other; A weight member that is in close contact with and in contact with the upper end edge of the reserve tank and can maintain the close contact state by its own weight; A device to prevent oil leakage during the brake system, which allows oil to be sucked in through the intake hole.