JP2622232B2 - Automotive brake auxiliary braking device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auxiliary brake system applied to a main brake system of a motor vehicle, and more particularly to a brake auxiliary brake system which does not become inoperable even when a high brake operating pressure is applied to the brake auxiliary brake system. The present invention relates to a vehicle brake auxiliary braking device that can smoothly perform various functions.

[0002]

2. Description of the Related Art Generally, an auxiliary brake device is also called an ABS brake, for example. Korean Patent Publication Nos. 1992-10515, U.S. Pat. 5
No. 161864. The applicant of the present application has also filed an application as Korean Utility Model Registration Application No. 15568. In such a device, when the main brake is operated, the hydraulic pressure of the working oil acting on the brake system is maintained.

Most of these devices have a housing configured to allow the brake fluid to flow in and out,
Generally, the oil includes an elastic rubber, which is an elastic body, and a working gas so as to maintain a hydraulic equilibrium.

[0004]

In the conventional apparatus described above, a plate-like elastic rubber is present in the oil working space, or a space in which the working oil can flow is formed in the elastic rubber, and a reaction occurs. As a result, it has been found that there is a limit in the ability to cope with a change in the pressure of the working oil when the brake is operated. That is, the elastic rubber acts elastically due to a change in the pressure of the brake operating oil to maintain the pressure balance of the fluid (oil). However, when the operating oil pressure exceeds a certain pressure and a high pressure is applied, When the elasticity of the elastic rubber reaches the limit, there occurs a problem that the elastic rubber becomes inoperable.

SUMMARY OF THE INVENTION An object of the present invention is to solve such a conventional problem. As the working pressure of the brake working oil increases, the area acting on the elastic rubber gradually increases, thereby increasing the oil pressure. An object of the present invention is to provide an automobile brake auxiliary braking device in which the elastic action of the elastic rubber acts evenly regardless of the low pressure state.

[0006]

To achieve the above object, the present invention provides an oil line connecting member through which oil flows, an oil passage through which the oil flows from the oil line connecting member, and an oil passage through the oil passage. An oil working space in which a free-flowing fluid flows is formed, and a housing provided in the oil working space with an elastic body which is subjected to pressure by a gas chamber filled with a working gas. The oil working space has a substantially conical shape with the oil passage side as the top, and a number of grooves are sequentially formed on the oil working space forming surface from the oil passage side, and the elastic body is recessed in the lower surface to form a gas chamber. A concave portion, a support portion inserted into the bottom portion of the oil working space, and a substantially conical upper working portion that is in close contact with the oil working space forming surface. Formed as one of the features that.

An oil line connecting member through which the oil flows, an oil passage through which the oil flows from the oil line connecting member, and an oil working space through which the oil flows freely through the oil passage are formed. A housing provided with an elastic body in the oil working space, the elastic body being pressurized by the filled gas chamber. The auxiliary braking device for an automobile brake includes a cylindrical portion that connects the oil working space of the housing to the oil passage. A plurality of grooves are sequentially formed from the oil passage side on the surface where the oil working space is formed, and the elastic body is inserted into the recess formed on the lower surface and serving as a gas chamber and the bottom of the oil working space. And the upper working portion, which has a frusto-conical shape that is in close contact with the oil working space forming surface, and Were oil flow guide strip, characterized in that it placed so as to form the oil passage gap truncated surface of the elastic member between the cylindrical portion and the outer peripheral surface thereof.

[0008]

According to the present invention, a large number of grooves are sequentially formed on the oil working space forming surface from the oil passage side so that the working oil can gradually flow into the oil working space.
The provision of the conical elastic body that is in close contact with the oil working space forming surface allows the working area of the working oil pressure acting on the elastic body to gradually increase as the pressure of the working oil increases. Even if a high high working oil pressure acts on the elastic body, the elastic body can respond to this elasticity. Therefore, a repetitive braking force can be stably applied to the brake by the instantaneous inflow and outflow of the working oil, and the working oil pressure can be maintained in balance.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of an auxiliary braking device according to the present invention;

FIGS. 1 to 3 show a first embodiment of the present invention. The housing 8 in this example is configured to be separable from an upper housing 8a and a lower housing 8b, and these are assembled by a screw-type fastening system. In this manner, by forming the separate type with the upper and lower housings 8a and 8b, the operation of assembling the elastic rubber 6 described later can be easily performed.

A bolt-shaped oil line connecting member 2 having an oil passage 2a is provided at an upper portion of the upper housing 8a so as to prevent oil leakage by an airtight packing 3. An air removing bolt 4 is fastened to a bolt head 2b of the oil line connecting member 2.

The oil passage 2a of the oil line connecting member 2
An access port 2c is provided through the intermediate portion so as to supply the working oil to the housing oil passage 15. A substantially conical oil working space 5 that gradually expands downward in the figure below the housing oil passage 15.
A large number of grooves 5a and projections 5b are alternately formed on the inner surface of the upper housing 8a forming the oil working space 5 so as to cover the entire inner periphery. That is, a large number of grooves 5 a are sequentially formed on the forming surface forming the oil working space 5 from the housing oil passage 15 side.

A lower housing 8 is provided in the oil working space 5.
The elastic rubber 6 which is an elastic body supported by b is inserted. The elastic rubber 6 has a supporting portion 6a inserted into the lower housing 8b, and a conical upper working portion 6b protrudes from the supporting portion 6a. A concave portion 6c is formed in the lower portion of the support portion 6a to form a gas chamber, and the gas chamber is filled with a nitrogen gas 7 as a working gas so as to have a pressure. Further, the recess 6c
A lower housing 8b is provided in a lower groove 6d formed at the edge of the lower housing 8b.
The central projection 9 projecting from the bottom of the oil working space 5 is fitted. As a result, a reliable closed state of the recess 6c can be easily obtained with a simple configuration, and the action of the nitrogen gas 7 can be ensured.

Reference numeral 21 in the drawing denotes a snap ring for connecting the oil line connecting member 2.

When brake braking is applied in such a configuration, the operating oil is transferred to the oil passage 2 by the oil pressure.
The oil flows into the oil working space 5 along a and 15 and the pressure of the flowing oil presses the elastic rubber 6. When the elastic rubber 6 is completely pressurized, the working oil flows out again by the relative elasticity of the elastic rubber. At this time, the nitrogen gas 7 works to assist the elastic action of the elastic rubber 6. By such an instantaneous inflow and outflow action of the working oil (about 12 times per second), the brake is provided with a repetitive braking capability, and the pressure of the working oil is kept in equilibrium.

In this embodiment, at the initial pressure of the working oil, the state is as shown in FIG. 3A, and the working oil is pushed into the groove 5a by pushing the upper portion of the elastic rubber 6 into the state as shown in FIG. 3B. become. At this time, the number of grooves 5a into which the working oil flows increases as the pressure of the working oil increases. That is, when the hydraulic oil pressure increases,
The operating oil having the increased pressure pushes the elastic rubber 6 in close contact with the projection 5b and flows into the next groove 5a, and further flows into the next groove 5a when the oil pressure further increases. Further, when the working oil pushes the elastic rubber 6 and goes into the next groove 5a beyond the projection 5b, the pressure is momentarily reduced, and a pressure wave is generated in the working oil pressure. The lining is such that the brakes are applied intermittently.

In addition, in this embodiment, at a certain high initial pressure, the working oil undulates due to the elastic action of the upper part of the elastic rubber 6, which is an elastic body. An elastic action is caused by the upper portion of the rubber, the elastic force of the middle portion of the elastic rubber 6 into which the oil flows into the groove 5a, and the pressure applied by the nitrogen gas 7 in the concave portion 6c. Further, at a very high oil pressure, the elastic rubber 6 moves close to the central projection 9 with a strong pressure,
On the contrary, due to the gas pressure generated and the repulsive elastic force of the elastic rubber 6, the elastic rubber 6 itself gradually generates an elastic action from below.
Smooth brake braking is achieved by maintaining the pressure wave and the balance by the change of the working oil pressure.

FIGS. 4 to 7 show a second embodiment of the present invention.
In this example, a cylindrical part 10 is formed at the uppermost part of the oil working space 5 connected to the housing oil passage 15, and the diameter of the cylindrical part 10 is equal to the diameter of the housing oil passage 1.
5 or more. Further, an oil flow guiding piece 11 in which a cross-shaped oil flow path 11a is formed is inserted into the cylindrical portion 10. The diameter of the oil flow guiding piece 11 is slightly smaller than the diameter of the cylindrical portion 10.

The oil flow guiding piece 11 is positioned so as to form an oil passage gap 12 between the cylindrical portion 10 and the outer peripheral surface of the oil flow guiding piece 11, and the truncated surface 6e of the elastic rubber 6 is formed. It is installed so that it can be supported above, and is configured to have a stable structure.

With such a configuration, in this embodiment, a smoother operation can be performed when the working oil flows in and out as in the first embodiment. That is, the working oil flowing into the oil passage 15 is
Oil flow path 1 of oil flow guiding piece 11 located immediately below
Oil passage gap 12 after being guided to the outer shell along 1a
Through which the working oil flows into the oil working space 5 or flows out of the oil working space 5 on the contrary, so that the working oil flows into and out of the oil working space 5 more smoothly.

Further, in this example, the operating oil pressure acts not only on the large area of the oil flow guiding piece 11 together with the brake braking, but also on the cross-shaped oil passage 11a.
Therefore, the working oil pressure is evenly transmitted to the elastic rubber 6 and a more balanced oil pressure action is performed.

[0022]

According to the present invention, the working oil entering the oil working space 5 does not act on the entire area of the elastic rubber as in the prior art, but acts on the elastic rubber 6 as the pressure of the working oil increases. The working area of the operating oil pressure is gradually increased. Accordingly, since the corresponding elastic action portion of the elastic rubber 6 increases in accordance with the pressure, even if a very high operating oil pressure exceeding a certain pressure acts on the elastic rubber 6, the elastic rubber 6 is correspondingly operated.
This makes it possible to prevent the occurrence of the inoperable phenomenon as in the prior art, thereby further improving the product reliability.

In addition, as in the second embodiment of the present invention, the metal oil inflow / outflow guide piece 11 is interposed between the oil passage 4 and the elastic rubber 6, so that the working oil is provided by the cross-shaped oil flow path. Are distributed and transmitted more smoothly, thereby providing a balanced oil pressure action, which can provide a more reliable, higher performance, better quality product.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view including a partial cross section of a brake assist braking device according to a first embodiment of the present invention.

FIG. 2 is a sectional view of the brake assist braking device shown in FIG. 1 in an assembled state.

FIG. 3 is a sectional view of an essential part for explaining an operation state of the brake assist braking device according to the first embodiment of the present invention.

FIG. 4 is a sectional view of a brake assist braking device according to a second embodiment of the present invention.

FIG. 5 is a perspective view of an elastic rubber and an oil flow guiding piece according to a second embodiment of the present invention.

FIG. 6 is a sectional view of an essential part for explaining a flow of operating oil of a brake assist braking device according to a second embodiment of the present invention.

FIG. 7 is a sectional view taken along the line AA ′ in FIG. 6;

[Explanation of symbols]

 Reference Signs List 2 oil line connecting member 2a oil passage 2b bolt head 2c access hole 3 airtight packing 4 air removal bolt 5 oil working space 5a groove 5b protrusion 6 elastic rubber (elastic body) 6a support portion 6b upper working portion 6c concave portion 6d lower groove 6e Truncated surface 7 Nitrogen gas 8 Housing 8a Upper housing 8b Lower housing 9 Central projection 10 Cylindrical part 11 Oil flow guiding piece 11a Oil flow path 12 Oil passage gap 15 Housing oil passage 21 Snap ring

Claims (5)

(57) [Claims] An oil line connecting member through which oil flows, an oil passage through which oil flows from the oil line connecting member, and an oil working space through which oil flows freely through the oil passage are formed. A housing provided with an elastic body in the oil working space that receives pressure from the filled gas chamber, wherein the oil working space of the housing has a substantially conical shape with the oil passage side as a top. A number of grooves are sequentially formed on the oil working space forming surface from the oil passage side, and an elastic body is formed in the lower surface portion as a gas chamber, and a support inserted into the bottom of the oil working space. And a substantially conical upper working portion which is in close contact with the oil working space forming surface. Over key auxiliary braking device. 2. The vehicle brake auxiliary braking device according to claim 1, wherein a central projection is provided at a bottom of the oil working space, and the central projection seals a concave portion of the elastic body to form a gas chamber. 3. An oil line connecting member through which oil flows, an oil passage through which oil flows from the oil line connecting member, and an oil working space through which oil flows freely through the oil passage are formed. A housing provided with an elastic body in the oil working space, which receives pressure from the filled gas chamber, in the auxiliary braking device for an automobile brake, wherein a cylindrical portion in which the oil working space of the housing communicates with the oil passage is provided at the top. It has a substantially conical shape and a number of grooves are sequentially formed on the oil working space forming surface from the oil passage side, and an elastic body is recessed on the lower surface and serves as a gas chamber, and at the bottom of the oil working space. Formed from a supporting portion to be inserted and an upper working portion having a frusto-conical shape which is in close contact with the oil working space forming surface; A vehicle brake assist brake characterized in that an oil flow guiding piece having a path is mounted on a truncated surface of an elastic body so as to form an oil passage gap between an outer peripheral surface thereof and the cylindrical portion. apparatus. 4. The vehicle brake auxiliary braking device according to claim 3, wherein the oil flow path of the oil flow guiding piece has a cross shape. 5. The vehicle brake auxiliary braking device according to claim 3, wherein a central projection is provided at a bottom portion of the oil working space, and the central projection seals a concave portion of the elastic body to form a gas chamber.