KR20140014821A

KR20140014821A - Leap type seal and accumulator having the same

Info

Publication number: KR20140014821A
Application number: KR1020120081877A
Authority: KR
Inventors: 안성기
Original assignee: 현대모비스 주식회사
Priority date: 2012-07-26
Filing date: 2012-07-26
Publication date: 2014-02-06

Abstract

SUMMARY OF THE INVENTION The present invention provides a lip seal positioned between an actuating member and a stationary member, the lip seal having at least one sucker formed concave on a contact surface in contact with the actuating member, thereby increasing the adhesive force between the piston and the reciprocating movement of the piston. By preventing the middle piston from shaking, it provides an advantageous effect of increasing the performance of regenerative braking.

Description

Lip type seal and Accumulator having the same}

The present invention relates to a lip seal and an accumulator comprising the same, and more particularly, to a lip seal installed between a cylinder and a piston for storing oil and an accumulator including the same.

Regenerative braking means braking through the process of recovering the electric energy by operating the motor as a generator using the kinetic energy of the vehicle. Recently, a brake system using regenerative braking has been used in a hybrid vehicle or an electric vehicle using a motor. However, because the braking force is weak by the regenerative braking alone, the hydraulic braking force is used together to obtain the necessary braking force of the vehicle.

On the other hand, in the case of a hybrid brake system in which regenerative braking and hydraulic braking are mixed, it is necessary to adjust the braking hydraulic pressure as necessary. To this end, several devices are typically added. In particular, a low pressure accumulator is required to implement regenerative braking based on an electronic stability program (ESC). The low pressure accumulator temporarily stores oil coming out of the front wheel brake and the rear wheel brake in the process of reducing the braking hydraulic pressure.

The low pressure accumulator includes a cylinder and a piston reciprocating inside the cylinder. At this time, a seal is installed on the outer circumferential surface of the piston to seal the inside of the cylinder and prevent wear of the piston. The performance of such a seal greatly affects the performance of the regenerative braking of the vehicle. Accordingly, there is a need for an improved structure of the seal capable of increasing the performance of the regenerative braking.

Accordingly, an object of the present invention is to provide an lip seal and an accumulator including the same to increase the adhesive force with the piston and to prevent the piston from shaking during the reciprocating movement of the piston.

The present invention for achieving the above object, in the lip seal formed in an annular shape, provides a lip seal formed with at least one sucker is formed concave on the inner peripheral surface.

Preferably, a protruding first lip and a second lip may be included, and a concave groove may be formed between the first lip and the second lip.

Preferably, the height of the first lip based on the bottom may be greater than the height of the second lip.

Another invention for achieving the above object is a vehicle accumulator including an annular lip seal installed on the outer circumferential surface of the piston reciprocating along the inner wall of the cylinder, at least one sucker is formed concave on the inner peripheral surface is formed A vehicle accumulator including a lip seal is provided.

Preferably, the lip seal includes a protruding first lip and a second lip, and a concave groove may be formed between the first lip and the second lip.

Preferably, the first lip seal and the second lip seal may be spaced apart from each other in the height direction of the piston.

Preferably, any one of the first lip seal and the second lip seal may be arranged such that the concave groove faces the inflow direction of the oil.

According to the lip seal and the accumulator including the same according to the present invention, by providing a sucker in the contact area with the piston, it is advantageous to increase the adhesive force with the piston and to prevent the piston from shaking during the reciprocating movement of the piston, thereby improving the performance of the regenerative braking. Provide effect.

1 is a block diagram showing the configuration of a braking system for adjusting braking hydraulic pressure;
2 is a cross-sectional view showing a cylinder and a piston of the accumulator shown in FIG. 1;
3 is a view showing for explaining the configuration of a ring-shaped seal according to an embodiment of the present invention,
4 is a cross-sectional view of an embodiment shown in FIG. 3;
FIG. 5 is a view illustrating an attachment state of the sucker and the piston illustrated in FIG. 3.
FIG. 6 is a view illustrating an internal cross section of the accumulator having the embodiment shown in FIG. 3 installed; FIG.
FIG. 7 is a view illustrating an internal cross section of an accumulator having two embodiments shown in FIG. 3 installed; FIG.
FIG. 8 is a diagram illustrating an internal cross section of an accumulator in which two exemplary embodiments illustrated in FIG. 3 are installed with different concave grooves.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to designate the same or similar components throughout the drawings. In addition, the preferred embodiments of the present invention will be described below, but it is needless to say that the technical idea of the present invention is not limited thereto and can be variously modified by those skilled in the art.

1 is a block diagram showing the configuration of a braking system for regulating braking hydraulic pressure.

First, through the brake pedal assembly 1, the braking system is implemented when the driver's effort is transmitted. To implement regenerative braking at the beginning of braking, the braking hydraulic pressure must be adjusted. Referring to FIG. 1, the braking hydraulic control unit 2 temporarily stores oil in the accumulator 2a so that friction braking does not occur in the front wheel braking unit 3 and the rear wheel braking unit 4.

FIG. 2 is a cross-sectional view illustrating the cylinder and the piston of the accumulator illustrated in FIG. 1. Referring to FIG. 2, the accumulator 2a is provided with a cylinder 5 providing a space in which oil is introduced and stored. The piston 6 is provided inside the cylinder 5 to repeat the vertical movement along the inner circumferential surface of the cylinder 5. An elastic member 7 is installed below the piston 6.

When oil enters the cylinder 5 through the pump and valve assembly, the piston 6 descends to receive the oil, and when the oil exits the cylinder 5 for friction braking, the elastic member 7 The piston 6 rises by the restoring force of. In the movement of the piston 6, the seal 8 is mounted on the piston 6 for abrasion of the piston 6 and sealing of the oil receiving space of the cylinder 5. The seal 8 is provided in the groove 5a formed concave along the outer circumferential surface of the piston 6.

The present invention proposes an improved structured lip seal which has the effect of increasing adhesion to the piston and preventing it from shaking when the piston starts to move.

Figure 3 is a view showing for explaining the configuration of the ring-shaped seal according to an embodiment of the present invention, Figure 4 is a view showing a cross section of the embodiment shown in FIG.

3 and 4 clearly illustrate only the major feature parts in order to clearly understand the present invention, and as a result various variations of the illustrations are expected, and the scope of the present invention Need not be limited.

Referring to FIG. 3, the lip seal 100 according to an exemplary embodiment of the present invention includes a sucker 130 formed to be concave on the inner circumferential surface 111.

Lip seal 100 is configured in an annular shape. The first lip 110 and the second lip 120 protrude. The first lip 110 and the second lip 120 are divided by a wedge-shaped concave groove 140. The concave groove 140 is formed long in the longitudinal direction of the lip seal 100, and the first lip 110 and the second lip 120 are also formed long in the longitudinal direction of the lip seal 100. The first lip 110 and the second lip 120 may be deformed to be close to or away from each other by an external force with respect to the concave groove 140.

Referring to FIG. 4, the height H2 of the first lip 110 may be greater than the height H1 of the second lip 120. Here, the height means a vertical distance from the bottom of the lip seal 100 to the end of the first lip 110 or the end of the second lip 120.

FIG. 5 is a view illustrating an attachment state of the sucker and the piston illustrated in FIG. 3.

On the other hand, the sucker 130 serves to increase the adhesive force of the lip seal 100 and the piston 200. Referring to FIG. 5, the sucker 130 is formed on the inner circumferential surface 111 in contact with the piston 200. One side of the first lip 110 described above may be part of the inner circumferential surface 111. The sucker 130 forms a closed space when a portion of the inner circumferential surface 111 is concave, and the inner circumferential surface 111 and the outer circumferential surface of the piston 200 are in close contact with each other. In one embodiment, when the lip seal 100 is in close contact with the outer circumferential surface of the piston 200, the sucker 130 is pressed in the direction of the arrow shown in FIG. Then, the air escapes to the outside in the internal space (s) formed by the sucker 130 and the outer peripheral surface of the piston 200. Thus, the adhesive force between the lip seal 100 and the piston 200 is added by the pressure difference between the inner space S and the outside.

The sucker 130 may be formed in an annular shape along the inner circumferential surface 111. In addition, the plurality of suckers 130 may be formed to be spaced apart from each other on the inner circumferential surface (111).

FIG. 6 is a diagram illustrating an internal cross section of an accumulator in which the embodiment shown in FIG. 3 is installed, and FIG. 7 is a diagram illustrating an internal cross section of the accumulator in which two embodiments shown in FIG. 3 are installed. FIG. 8 is a diagram illustrating an internal cross section of an accumulator in which two exemplary embodiments illustrated in FIG. 3 are installed with different concave grooves.

Referring to FIG. 6, one lip seal 100 is installed on the outer circumferential surface of the piston 200 so that the concave groove 140 faces upward. Referring to FIG. 7, two lip seals 100-1 and 100-2 may be spaced apart from each other and installed on the outer circumferential surface of the piston 200. This is to supplement one lip seal if one lip seal fails to function.

Referring to FIG. 8, two lip seals 100-1 and 100-2 may be installed on the outer circumferential surface of the piston 200 so that the directions of the concave grooves 140 are different from each other. In one embodiment, the lip-shaped seal (100-1) is installed on the relatively upper side is installed so that the concave groove 140 faces the inflow direction of the oil. On the other hand, the lip seal 100-2 at the lower side may be installed to face in a direction opposite to the inflow direction of the oil.

It will be apparent to those skilled in the art that various modifications, substitutions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. will be. Accordingly, the embodiments disclosed in the present invention and the accompanying drawings are not intended to limit the technical spirit of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by the embodiments and the accompanying drawings. . The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

100: Lip Seal
110: first lip
111: inner circumference
120: second lip
130: sucker
140: concave groove
200: piston
300: cylinder

Claims

In a lip seal formed in an annular shape,
A lip seal with at least one sucker formed concave on an inner circumferential surface.

The method according to claim 1,
A lip seal comprising a protruding first lip and a second lip, wherein a concave groove is formed between the first lip and the second lip.

The method of claim 2,
A lip type seal, characterized in that the height of the first lip relative to the bottom is formed larger than the height of the second lip.

In the vehicle accumulator comprising an annular lip seal provided on the outer peripheral surface of the piston reciprocating along the inner wall of the cylinder,
A vehicle accumulator comprising a lip seal with at least one sucker formed concave on an inner circumferential surface thereof.

5. The method of claim 4,
The lip seal includes a protruding first lip and a second lip, and a concave groove is formed between the first lip and the second lip.

6. The method of claim 5,
And a first lip seal and a second lip seal disposed to be spaced apart from each other in a height direction of the piston.

The method of claim 6,
The at least one of the first lip seal and the second lip seal is a vehicle accumulator, characterized in that the concave groove is arranged to face the inflow direction of the oil.

6. The method of claim 5,
The height of the first lip on the basis of the floor is characterized in that the vehicle is formed larger than the height of the second lip.