KR20100031993A - Piston seal of disk brake - Google Patents

Piston seal of disk brake Download PDF

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Publication number
KR20100031993A
KR20100031993A KR1020080090925A KR20080090925A KR20100031993A KR 20100031993 A KR20100031993 A KR 20100031993A KR 1020080090925 A KR1020080090925 A KR 1020080090925A KR 20080090925 A KR20080090925 A KR 20080090925A KR 20100031993 A KR20100031993 A KR 20100031993A
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KR
South Korea
Prior art keywords
seal
piston
wheel cylinder
circumferential surface
primary
Prior art date
Application number
KR1020080090925A
Other languages
Korean (ko)
Inventor
변문환
Original Assignee
현대모비스 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 현대모비스 주식회사 filed Critical 현대모비스 주식회사
Priority to KR1020080090925A priority Critical patent/KR20100031993A/en
Publication of KR20100031993A publication Critical patent/KR20100031993A/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
    • F16D55/02—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members
    • F16D55/22—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads
    • F16D55/224—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members
    • F16D55/225—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads
    • F16D55/226—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads in which the common actuating member is moved axially, e.g. floating caliper disc brakes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
    • F16D65/16—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake
    • F16D65/18—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake adapted for drawing members together, e.g. for disc brakes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2121/00—Type of actuator operation force
    • F16D2121/02—Fluid pressure
    • F16D2121/04—Fluid pressure acting on a piston-type actuator, e.g. for liquid pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2125/00—Components of actuators
    • F16D2125/02—Fluid-pressure mechanisms
    • F16D2125/04—Cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2125/00—Components of actuators
    • F16D2125/02—Fluid-pressure mechanisms
    • F16D2125/08—Seals, e.g. piston seals

Abstract

PURPOSE: A piston seal of a disk brake is provided to reduce the abrasion rate of a brake pad, prevent partial abrasion, and increase return force of a piston using a primary seal and a secondary seal. CONSTITUTION: A piston seal of a disk brake comprises a primary seal(7) and a secondary seal(8). The outer circumference of the primary seal is press-fitted into a seal mounting hole(1a) formed near a disk(11) in a wheel cylinder. The inner circumference of the primary seal is projected to the wheel cylinder and is contacted with the outer surface of a piston(3). The outer circumference of the secondary seal is press-fitted into a seal mounting groove(1b) of a caliper housing(1) positioned inside the wheel cylinder.

Description

Piston seal of disk brake

The present invention relates to a piston seal of a disc brake which is mounted on a caliper housing so as to increase the return force of the piston when the hydraulic pressure is released.

Generally, a disc brake used as a braking device of a vehicle includes a caliper housing 1 attached to a spindle of a knuckle, and a wheel cylinder 2 formed by the caliper housing 1, as shown in cross section in FIG. A piston (3) installed so as to move linearly by a hydraulic force therein, a caliper carrier (4) installed in combination with the caliper housing (1) so as to be located in front of the caliper housing (1), and the piston (3). Back plate (5) coupled to the front of the caliper carrier (4) and the brake cylinder generated by the brake cylinder generated in the wheel cylinder 2, the piston 3 protrudes from the wheel cylinder (2) It is configured to include a brake pad 6 coupled to the front of the back plate 5 to generate a braking force by the frictional force with the disk 11 while pressing both sides of the disk (11).

Therefore, when the driver presses the brake pedal, the pressure is applied to the master cylinder and the hydraulic pressure is pushed into the wheel cylinder 2, and the piston 3 moves to protrude out of the wheel cylinder 2. The brake pads 6 come into contact with both side surfaces of the disc 11 to stop the rotation of the disc 11, thereby braking the vehicle.

When the brake pedal is released, the hydraulic pressure of the wheel cylinder 2 is released, so that the piston 3 retreats to the inside of the wheel cylinder 2, thereby contacting both sides of the disk 11. When the brake pad 6 is removed from the disk 11, the disk 11 which is stopped is rotated again.

On the other hand, the disc brake further maintains the airtight between the caliper housing (1) and the piston (3) and further includes a piston seal for increasing the return force of the piston (3) when the hydraulic pressure of the wheel cylinder (2) is released. It is configured to include.

The piston seal is composed of a primary seal (7) and a secondary seal (8) formed in the shape of the same circular ring, the primary seal (7) and the secondary seal (8) is the outer peripheral surface of the caliper housing (1) The inner circumferential surface of the inner mounting surface (1a, 1b) is fixed to each of the mounting mounting groove (1a, 1b) formed in the) and protrudes to the wheel cylinder (2) is installed to contact the outer surface of the piston (3).

The reason why the piston seal is composed of a plurality of the primary seal 7 and the secondary seal 8 as described above is to increase the return force of the piston 3 when the hydraulic pressure generated in the wheel cylinder 2 is increased. The piston seal has a problem that the primary seal 7 does not help the return of the piston 3 due to the relationship between the primary seal 7 and the secondary seal 8 in the same shape.

That is, when hydraulic pressure is generated in the wheel cylinder 2 by stepping on the brake pedal as shown in FIG. 2, the piston 3 moves in the primary cylinder while moving in the direction (shown in the arrow M1 direction) from the wheel cylinder 2. (7) and the secondary seal 8 are deformed.

At this time, the force of the hydraulic pressure generated in the wheel cylinder (2) acts only on the secondary seal (8), because the primary seal (7) and the secondary seal (8) is the same shape, which causes the hydraulic pressure to the secondary seal (8) By not passing through), the hydraulic force is not applied to the primary seal (7).

Then, when the hydraulic pressure generated in the wheel cylinder 2 is released by releasing the brake pedal that has been stepped on, the first return is performed in which the piston 3 retreats to the inside of the wheel cylinder 2 first, and then the primary seal is continued. The piston 3 is completely returned by the force of restoring the appearance of the 7 and the secondary seal 8 (in the direction of the arrow M2 shown).

On the other hand, since the hydraulic pressure generated in the wheel cylinder 2 is delayed gradually in time rather than the first return of the piston 3, the secondary seal 8, which was under hydraulic pressure, has the piston when restoring its appearance. Although it is very helpful to increase the return force of (3), the appearance of the primary seal (7) is restored to the state that is not under the hydraulic force, so the appearance of the piston (3) when the first return is almost complete There is a problem that does not help to increase the return force of the piston (3) by being restored.

As such, the primary seal 7, which does not help increase the return force of the piston 3, only reduces the adverse effects of the cost increase and the weight increase, and also the contact time between the brake pad 6 and the disc 11. By causing the increase, it causes the occurrence of juder due to the increase in the wear rate of the brake pad 6 and the uneven wear and the generation of noise.

Accordingly, the present invention, the hydraulic seal acts on the primary cylinder as well as the secondary seal when the hydraulic pressure generated in the wheel cylinder by changing the shape of the secondary seal, the primary seal and the secondary seal when the hydraulic pressure generated in the wheel cylinder All of these provide a piston seal for the disc brake to help increase the return force of the piston, thereby reducing the contact time between the brake pad and the disc, and reducing the wear rate of the brake pad and preventing abrasion. Has its purpose.

The piston seal of the disk brake of the present invention for achieving the above object is fixed to the outer mounting surface is pressed into the mounting hole formed in the position adjacent to the disk in the wheel cylinder formed by the caliper housing and the inner inner peripheral surface to the wheel cylinder A primary seal installed to protrude and contact the outer surface of the piston; The outer circumferential surface of the caliper housing located inwardly of the wheel cylinder in the primary seal is fixed by pressing the outer circumferential surface of the primary seal and the inner circumferential surface of the inner cylinder is installed to contact the outer surface of the piston and penetrates both sides. It characterized in that it comprises a; secondary chamber formed with a plurality of passage holes.

According to the present invention, the hydraulic pressure acts together with the secondary seal and the primary seal when the hydraulic pressure is generated in the wheel cylinder, and when the hydraulic pressure generated in the wheel cylinder is released, the primary seal and the secondary seal help both increase the return force of the piston. This can shorten the contact time between the brake pad and the disc, reduce the wear rate of the brake pad, and prevent judging and braking of the brake pad. Not only can eliminate the noise, but also has the effect of removing noise.

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

3 to 5 show a view of the piston seal of the disc brake according to the invention.

The disc brake of the vehicle is provided with a caliper housing (1) attached to the spindle of the knuckle and a piston installed to linearly move by hydraulic force in the wheel cylinder (2) formed by the caliper housing (1). 3) and a caliper carrier 4 which is installed in combination with the caliper housing 1 so as to be located at the front of the caliper housing 1, and is coupled to the front of the piston 3 and the caliper carrier 4 When the piston (3) is protruded from the wheel cylinder (2) by the back plate (5) is installed and the braking hydraulic pressure generated in the wheel cylinder (2) while pressing the both sides of the disk (11) The brake pad 6 is coupled to the front surface of the back plate 5 so as to generate a braking force by friction with the disk 11.

The disc brake further maintains the airtightness between the caliper housing 1 and the piston 3 and further includes a piston seal for increasing the return force of the piston 3 when the hydraulic pressure of the wheel cylinder 2 is released. It is configured to include.

The piston seal is composed of a primary seal (7) and a secondary seal (8) formed in the shape of a circular ring, wherein the primary seal (7) and the secondary seal (8) are mounted in the caliper housing (1) The grooves 1a and 1b are installed so as to be located one by one.

That is, the caliper housing 1 has a plurality of mounting mounting grooves 1a and 1b which are opened in the wheel cylinder 2 side by side, one mounting mounting groove 1a of which is a wheel cylinder 2. It is formed so as to be located at a position adjacent to the opening of the (open position adjacent to the disk 11), the other one is formed at a position spaced apart by a predetermined distance in the sealed inward of the wheel cylinder (2).

Accordingly, the outer circumferential surface of the primary seal 7 is press-fitted into the mounting mounting groove 1a of the caliper housing 1 formed at a position adjacent to the disk 11 in the wheel cylinder 2, The inner inner circumferential surface protrudes into the wheel cylinder 2 and is installed to contact the outer surface of the piston 3.

In addition, the secondary seal 8 is fixed to the outer circumferential surface of the primary seal 7 in the sealed mounting groove 1b of the caliper housing 1 located in the sealed inner side of the wheel cylinder 2 by being press-fitted and fixed. The inner circumferential surface of the inner side is installed to protrude into the wheel cylinder 2 and to contact the outer surface of the piston 3.

On the other hand, the secondary chamber 8 is formed with a plurality of passage holes (8a) penetrating both sides, the passage hole (8a) is recessed toward the outer peripheral surface from the inner inner peripheral surface of the secondary chamber (8). It is formed in the shape of a cross-section of the Di- (c).

Since the shape of the flow path hole 8a may be formed in a semicircular tunnel shape and may be formed in various shapes such as a triangle, the flow path hole 8a is not limited to any one shape.

Hereinafter, the operation of the present invention will be described.

First, when the driver presses the brake pedal, pressure is applied to the master cylinder and hydraulic pressure is pushed into the wheel cylinder 2, and the piston 3 moves to protrude out of the wheel cylinder 2, and the brake The pad 6 comes into contact with both sides of the disc 11 to stop the rotation of the disc 11, thereby braking the vehicle.

Here, the hydraulic force generated in the wheel cylinder 2 not only acts on one side of the secondary chamber 8, but also passes through the passage hole 8a of the secondary chamber 8 to one side of the primary chamber 7. Will also work together.

Then, the primary seal 7 and the secondary seal 8 may move (the direction of arrow M1 shown) in which the piston 3 protrudes from the wheel cylinder 2 by hydraulic pressure generated in the wheel cylinder 2. When the outer shape is deformed, since the deformed shape is restored when the hydraulic pressure generated in the wheel cylinder 2 is restored, it helps to increase the return force of the piston 3.

On the other hand, when the hydraulic pressure generated in the wheel cylinder 2 is released by releasing the brake pedal that has been stepped on, the first return is performed in which the piston 3 retreats to the inside of the wheel cylinder 2 first, and then the primary seal is continued. The piston 3 is completely returned by the force of restoring the appearance of the 7 and the secondary seal 8 (in the direction of the arrow M2 shown).

Here, since the hydraulic pressure generated in the wheel cylinder 2 is delayed gradually in time rather than the first return of the piston 3, the primary seal 7 and the secondary seal 8, which are being subjected to hydraulic pressure, are applied. ) Is very helpful in increasing the return force of the piston (3) when the appearance is restored.

Therefore, since the embodiment of the present invention is also a configuration that can help increase the return force of the piston (3) also the primary seal (7) is a quick return to the piston 3, thereby the brake pad ( 6) has the advantage of shortening the contact time between the disk 11, the advantage of reducing the wear rate of the brake pad 6 and the advantage of preventing uneven wear of the brake pad 6, Not only can the judder occurring during braking be eliminated, but there is also an advantage in that noise can be eliminated.

1 is a cross-sectional view of a disc brake having a conventional piston seal,

2 is an enlarged view of an installation position of a piston seal in FIG. 1 when the hydraulic pressure of the wheel cylinder is generated;

3 is a cross-sectional view of a disc brake having a piston seal according to the present invention,

4 is a perspective view of a piston seal according to the present invention,

FIG. 5 is an enlarged view of an installation position of the piston seal in FIG. 3 and illustrates the hydraulic cylinder of the wheel cylinder. FIG.

<Description of Symbols for Main Parts of Drawings>

1-Caliper Housing 1a, 1b-Mounting Groove

2-Wheel Cylinder 3-Piston

7-Primary Seal 8-Secondary Seal

8a-Eurohole 11-disc

Claims (3)

In the wheel cylinder 2 formed by the caliper housing 1, an outer circumferential surface is press-fitted to the mounting mounting groove 1a formed at a position adjacent to the disk 11, and an inner inner circumferential surface protrudes into the wheel cylinder 2. A primary seal 7 installed to contact the outer surface of the piston 3; An outer circumferential surface of the caliper housing 1 located inwardly of the wheel cylinder 2 in the primary seal 7 is fixed to the outer circumferential surface by press-fitting, and an inner inner circumferential surface of the wheel cylinder 2 is fixed to the wheel cylinder 2. A secondary seal 8 which protrudes to be in contact with the outer surface of the piston 3 and has a plurality of passage holes 8a penetrating both sides; Piston seal of the disc brake comprising a. The method of claim 1, wherein the passage hole (8a), A shape formed concavely recessed from the inner inner circumferential surface of the secondary seal 8 toward the outer outer circumferential surface; Piston seal of the disc brake, characterized in that. The method according to claim 1, wherein the primary yarn (7) and the secondary yarn (8) is formed in a circular ring shape; Piston seal of the disc brake, characterized in that.
KR1020080090925A 2008-09-17 2008-09-17 Piston seal of disk brake KR20100031993A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020080090925A KR20100031993A (en) 2008-09-17 2008-09-17 Piston seal of disk brake

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020080090925A KR20100031993A (en) 2008-09-17 2008-09-17 Piston seal of disk brake

Publications (1)

Publication Number Publication Date
KR20100031993A true KR20100031993A (en) 2010-03-25

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Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020080090925A KR20100031993A (en) 2008-09-17 2008-09-17 Piston seal of disk brake

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220163076A1 (en) * 2020-11-20 2022-05-26 Court Holdings Limited Hybrid disk brake piston systems, methods of making said hybrid systems, and methods of using said hybrid systems

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220163076A1 (en) * 2020-11-20 2022-05-26 Court Holdings Limited Hybrid disk brake piston systems, methods of making said hybrid systems, and methods of using said hybrid systems

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