WO2000006434A1

WO2000006434A1 - Accumulator for hydraulic brake

Info

Publication number: WO2000006434A1
Application number: PCT/KR1999/000409
Authority: WO
Inventors: Moung Kil Kim
Original assignee: Moung Kil Kim
Priority date: 1998-07-27
Filing date: 1999-07-27
Publication date: 2000-02-10
Also published as: KR200246226Y1; KR20000003631U

Abstract

An accumulator for automobile brake lock prevention which has an excellent durability after a long-time use and can perform a sufficient brake lock prevention despite a wide-range oil pressure change by being provided with a pressure cap piston (9) for allowing an elastic valve (8) to receive a uniform oil pressure and multiple springs (10, 13) having different spring constants, wherein a high pressure fluid produced due to an abrupt oil pressure rise in a master cylinder and a brake cylinder deforms the elastic valve (8) and disc springs (10, 13) after passing the vertical flow path (18) of the accumulator to allow part of its high pressure to be stored in the accumulator, thereby preventing the brake lock.

Description

Description Hydraulic brake accumulator Technical field

The present invention relates to an accumulator for a hydraulic brake having a pressure 'cap' piston for receiving a uniform pressure on an elastic valve and a plurality of disks' spring portions having different spring coefficients, and used for a long time. The present invention relates to a hydraulic brake having a function of preventing a brake from tightening even in a wide range of changes in brake oil pressure while having sufficient durability against the brake. Background art

Conventionally, this type of brake tightening prevention system includes U.S. Patent Nos. 3,430,660, 4,188,073, 4,571,009, 5,036,879, 5,058,961 No. 5,074,625, etc. are known.These brake tightening prevention systems mount a rubber valve (bulb) between the upper part of the body and the lower part of the body, and the expansion part of the valve is inserted. When the brake is depressed, hydraulic pressure of the brake is transmitted to the hydraulic guide groove of the elastic valve of the accumulator, and the valve is actuated by the pressure. The volume expands toward the arcuate space, and the effect of storing a part of the hydraulic pressure prevents the brake from tightening.

However, the phenomenon of preventing the brake from tightening in such a system has a problem that the hydraulic pressure storage rate and the service life are extremely shortened due to excessive expansion and contraction because all pressure is applied to the elastic valve. Split supply is slow Therefore, there was a disadvantage that the braking distance was prolonged.

Therefore, in order to solve such a drawback, U.S. Pat. No. 5,390,989 uses the same elastic valve, but arranges a plurality of disk springs at the lower end of the elastic valve to store hydraulic pressure. A system is disclosed that transmits splits, prevents excessive elastic contraction and expansion, and improves the pressure splitting ability by employing disc * springs.

However, such a brake tightening prevention system forms a hydraulic guide groove having a conical deep groove in the middle of the upper end of the elastic valve, and expands and contracts around the end of the hydraulic guide groove by hydraulic pressure. However, there is a problem in that excessive stress is applied to this and repeated use results in aging and destruction.

In addition, since it is composed of a single elastic structure having a plurality of springs of the same size, it does not generate vibrations sensitive to a wide range of changes in brake oil pressure, but generates vibrations only in a limited hydraulic pressure range. Therefore, it was not possible to reliably guarantee the prevention of tightening the brakes, and there was also a problem that the braking distance of the vehicle was long.

In addition, a Teplon 'coating layer is formed inside the bush to reduce friction, but this Teplon' coating layer repeats expansion and contraction. The coating layer peels off due to friction with the expansion part of the elastic valve. Also, the peeled teplon 'coating is caught between the disc's springs, which has a significant adverse effect on the operation of the brake tightening.

Disclosure of the invention

The present inventor has conducted intensive studies to solve the above problems, and as a result, has replaced the hydraulic guide portion having the deep groove in the conventional system with a groove of a small hemisphere, Insert pressure 'cap biston on side In addition, the problem of the elastic valve is solved by equally dividing the elastic valve stress caused by the hydraulic pressure applied to the elastic valve into the elastic valve. Place and form two disks * spilling part. This makes it possible to vibrate even in a wide range of oil pressure changes, and also to smoothly perform the action of preventing brake tightening even at low pressures and high pressures. Materials that must be teplon-coated, such as free-cutting steel The present inventors have found that the conventional problems can be solved by manufacturing the bush with a copper alloy that does not require a coating instead of the above, and that the braking distance can be greatly reduced, thereby completing the present invention.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings of the present invention.

FIGS. La and lb are an exploded perspective view and a cross-sectional view showing a fastening state of a conventional hydraulic brake accumulator. As described above, the conventional accumulator is composed of an upper part (1) of a main body having a fastening nut (S) and a lower part (2) of a main body having a bolt part (S ') to be fastened to the upper part (1) of the main body. ) And the upper and lower parts (1) and (2) of the main body, a valve (3) having a hydraulic guide groove (chamber) (3 ′), a support flange (3 ″), and an expansion part (3 ″ ′). ) Is mounted in a known hydraulic brake tightening prevention device, wherein the vertical groove (10) formed in the lower part (2) of the main body is inserted between the vertical grooves (10), and the teplon-coating layer ( A support bush (11) having a 1Γ), which is accommodated under the support bush (11) and is resiliently contracted by the expansion of the valve (3) to provide resilient force for split supply of hydraulic pressure. Elastic structure (12), and a safety structure (13) positioned above and below the elastic structure (12) to prevent damage to the elastic structure (12) when excessive hydraulic pressure is supplied. Ranaru brake interference preventing apparatus has been disclosed for automobiles.

A brake tightening prevention device having such a structure is provided with a pressure component of an elastic valve. The problem of cracking, the elastic valve being damaged due to repeated expansion and contraction, the use of one spring part composed of multiple disks of the same size, the insensitivity to a wide range of hydraulic changes, and the coating on the inside of the bush There are problems.

The present invention solves these various problems, and as shown in the attached FIGS. 2 and 3, forms a pressure 'cap-biston' into which an elastic valve is inserted, and further has a size. A plurality of discs with different springs are arranged.

BRIEF DESCRIPTION OF THE FIGURES

Figure la is an exploded perspective view of a conventional hydraulic brake accumulator.

Figure lb is a cross-sectional view _c showing the engagement state of a conventional hydraulic accumulator brake

FIG. 2 is an exploded perspective view of the hydraulic brake accumulator of the present invention.

Figure 3 is a sectional view _c showing the engagement state of the accumulator hydraulic brake of the present invention

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the present invention will be described in more detail by way of examples.

FIG. 2 and FIG. 3 are an exploded perspective view and a sectional view of the hydraulic brake accumulator of the present invention.

2 and 3, the upper end of the upper part (7) of the main body has a hollow protrusion (7 ') formed with threads on both the inside and the outside. An air valve (6) is fastened inside (7 '). A cap (5) is screwed in to protect the air valve (6).

In the center of the upper part (7) of the main body, there is a hollow part (17) through which brake fluid flows. It is formed. The brake fluid flows into the hollow portion (17) and applies hydraulic pressure. A vertical flow path (18) is formed in the center of the hollow portion.

Also, a thread is formed inside the lower part of the upper part (7) of the main body. The head of the elastic valve (8) is inserted and crimped below the upper part (7) of the main body.

A pressure guide groove (19) is formed in the center of the flange (8 ') of the elastic valve (8). At the outside of the elastic valve (8), a pressure 'cap' button (9) is inserted and crimped from below the elastic valve (8) to evenly distribute the compressive stress of the elastic valve (8). ing.

The material of the elastic valve (8) is not particularly limited, but is not particularly limited as long as it is not denatured at a temperature of 100 ° C or more and oil. For example, NBR (Nitrile Butadiene Rubber) and the like can be mentioned.

Also, since the spring coefficient varies depending on the material and thickness of the elastic valve (8), the braking distance also varies.

The pressure 'cap' piston (9) has a projection (9 ') formed at the lower end to fix one or more small disc' springs (10) and the small disc 'spring (10) downward. The piston (10) and the disc spring (10) and the piston (11) are kept strong.

In FIG. 2, reference numeral 10 'indicates a state of a spring portion where a plurality of small disc'springs are arranged. Here, the disc spring is a known one, meaning that the outer diameter and the inner diameter do not form the same plane, and are arranged in series with each other symmetrically. Therefore, when pressure is applied to the spring due to the difference between the positions of the outer diameter and the inner diameter, the spring has an elastic force.

The number of such disc springs depends on the material, outer diameter, inner diameter, and shape. The same is true for the large disk 'spring described later.

It is a well-known fact that the spring coefficient changes depending on the material, shape, and number of disc springs used, and the braking distance also changes accordingly.

A support plate (12) for securely supporting the small disc's spring (10,), the biston 'ring (11) and the lower large disc' spring (13) is located below the pressure cap 'piston'. Is done. A plurality of the large disc 'springs (13) can be attached, and the number is not particularly limited.

Reference numeral 13 'indicates a case where a plurality of large disk springs are attached.

By attaching the large disk spring portion (13 ') in this way, it vibrates to a large oil pressure and can sufficiently play a role in preventing brake tightening even in a wide range of oil pressure.

A lower safety support plate (14) is arranged below the large disc * spring (13), and the upper end protruding portion of this support plate (14) is inserted into the groove of the large disc 'spring (13). To prevent withdrawal. In addition, the attachment of such a support plate (14) causes the large disc 'spring (13) to oscillate, thereby preventing wear and damage on the lower part (16) of the body.

The pressure 'cap' button (9), small disc 'spring (10'), piston 'ring (11), upper and lower safety support plates (12) (14), large disc' spring '(13') Maintained firmly in the bush (15) inside the lower part (16) of the body. The material of the bush (15) is not particularly limited, but any material that does not require an inner coating is sufficient. For example, a material having high wear resistance such as a copper alloy or a gold-copper alloy is desirable.

The outside of the bush (15) is supported by the lower part (16) of the main body, but the material of the upper part of the main body and the lower part (16) of the main body is not particularly limited as long as a light and durable material can be used. For example, duralumin is desirable.

Next, FIG. 3 is a cross-sectional view showing a fastening state of the hydraulic brake accumulator of the present invention. Hereinafter, the operating principle of the brake tightening prevention according to the present invention will be described with reference to FIGS.

When the driver presses the brake pedal, the hydraulic pressure in the master cylinder suddenly rises, causing an instantaneous abnormal high pressure phenomenon with surge (Surge) pressure and shock waves in the brake system fluid. The fluid flows into the vertical channel (18) of the accumulator through the channel (17), and causes vibration in the elastic structure (10 to 14) of the accumulator. Then, the high-pressure fluid first applies pressure to the elastic valve (8) through the hydraulic guide groove (19), and the pressure is increased together with the elastic valve (8) vibrated by the pressure. The cap and biston vibrates together, and this vibration simultaneously vibrates each disk spring, causing a periodic pressure change to the brake oil pressure for a certain period of time, causing the pressure in the fill cylinder to change periodically and the brake This will perform the function of preventing tightening.

Originally, elastic valves and disc springs have high damping, material and structure. By the way, when they are connected in series, the overall spring coefficient decreases relatively, and when they are applied with hydraulic pressure, they have a spring coefficient that can generate sufficient vibration, and at the same time, are durable against high hydraulic pressure. It has a suitable material and structure.

In addition, the first spring part reacts and vibrates to small hydraulic pressure, and conversely the second spring part reacts and vibrates to large hydraulic pressure. It has a structure that can perform the prevention function. Industrial applicability On a dry asphalt road surface, a sudden stop at a speed of 100 km / h indicates that a regular car showed a braking distance of 62 m, while a car equipped with an electronic anti-locking system showed 43 m. When the same experiment was performed with the product according to the present invention installed, the braking distance was 30 m.

In addition, the brake accumulator of the present invention is easy to attach and detach, very inexpensive, and has excellent durability even when used for a long time.

It is possible to manufacture a hydraulic brake that can sufficiently perform the function of preventing brake tightening even in a wide range of oil pressure changes.

Claims

The scope of the claims

1. The upper part 7 of the main body, the air valve 6 screwed inside the upper end of the upper part 7 of the main body, and the cap of the air valve 6 that protects and installs the air valve 6 and is screwed outside the upper end of the upper part of the main body 5, an elastic valve 8 whose head is inserted and crimped at the upper end of the lower screw fastening part of the upper part 7 of the main body, and a hydraulic pressure comprising a lower part 16 of the main body screwed to the lower side of the upper part 7 of the main body In the accumulator of the type brake,

A pressure 'cap' biston 9 which is inserted and crimped under the elastic valve 8 and distributes the compression stress of the elastic valve 8 evenly, and under the pressure 'cap' biston (9) A first spring portion 10 'having a number of small disc-springs 10 to be passed therethrough, a screw ring 11 for fixing the first spring portion 10', and a lower portion of the screw ring 11 An upper safety support plate 12 that is in close contact with the upper safety support plate 12, a plurality of large discs symmetrically connected to each other in series with the upper safety support plate 12, a second spring portion 13 that is connected by a spring 13, and the second spring portion 13 An accumulator for a hydraulic brake, comprising: a lower safety support plate 14 closely attached to the lower side; and a bush 15 provided inside the lower portion 16 of the main body to protect the inside of the lower portion 16 of the main body.

2. The accumulator for a hydraulic brake according to claim 1, comprising spring portions 10 'and 13' having different spring coefficients from each other.

3. A plurality of safety support plates 12, 14 mounted between spring portions 10 ', 13' having different spring coefficients from each other, and a plurality of biston 'rings 11 are mounted. An accumulator for a hydraulic brake as described.

4. The accumulator for a hydraulic brake according to claim 1, wherein the braking force is adjusted by changing a material and a thickness of the elastic valve (8).

5.It is characterized in that the braking force is adjusted by changing the radius, thickness, shape and number of springs 10 and 13 constituting the spring parts 10 'and 13' having a plurality of different spring coefficients. The accumulator for a hydraulic brake according to claim 1, wherein