KR20100018306A - Dih brake - Google Patents

Dih brake Download PDF

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Publication number
KR20100018306A
KR20100018306A KR1020080077017A KR20080077017A KR20100018306A KR 20100018306 A KR20100018306 A KR 20100018306A KR 1020080077017 A KR1020080077017 A KR 1020080077017A KR 20080077017 A KR20080077017 A KR 20080077017A KR 20100018306 A KR20100018306 A KR 20100018306A
Authority
KR
South Korea
Prior art keywords
brake
cylinder
piston
force
dih
Prior art date
Application number
KR1020080077017A
Other languages
Korean (ko)
Inventor
장휘봉
Original Assignee
현대자동차주식회사
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 현대자동차주식회사 filed Critical 현대자동차주식회사
Priority to KR1020080077017A priority Critical patent/KR20100018306A/en
Publication of KR20100018306A publication Critical patent/KR20100018306A/en

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    • 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
    • F16D65/22—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake adapted for pressing members apart, e.g. for drum 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
    • F16D2125/00—Components of actuators
    • F16D2125/02—Fluid-pressure mechanisms
    • F16D2125/10—Plural pistons interacting by fluid pressure, e.g. hydraulic force amplifiers using different sized pistons
    • 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
    • F16D2125/18—Mechanical mechanisms
    • F16D2125/58—Mechanical mechanisms transmitting linear movement
    • F16D2125/60—Cables or chains, e.g. Bowden cables
    • 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
    • F16D2127/00—Auxiliary mechanisms
    • F16D2127/02—Release mechanisms

Abstract

PURPOSE: A DIH brake is provided to separate a brake shoe from a brake drum when a vehicle is parked for a long time by pulling the brake shoe using vacuum. CONSTITUTION: A DIH brake comprises a brake drum, a brake shoe(50) and an operating unit(10). The brake drum revolves with the wheel of the vehicle. The brake shoe generates the brake force by contacting with the brake drum. The operating unit expands the brake shoe toward the brake drum side by generating the fluid pressure using a parking cable. The operating unit comprises a first cylinder(20) and a second cylinder(30). The first and second cylinders comprise a first piston(22) and a second piston(32). The first piston generates the fluid pressure with the operating force of the parking cable. The fluid pressure generated by the second piston is transferred to the brake shoe by the second piston.

Description

DIH brakes

The present invention relates to a DIH brake, and more particularly, to a DIH brake in which the brake shoe is controlled by hydraulic pressure.

In general, a brake system of a vehicle is used to maintain a parking state at the same time as decelerating and stopping a driving vehicle, and is divided into a main brake used when decelerating and stopping a vehicle and a parking brake used when parking a vehicle.

Among these, the main brake is classified into a disc brake and a drum brake according to its structure. The disc brake has a structure in which pads provided on both sides of the disc brake are compressed and braked, and the disc brake is mounted on the front wheel of the vehicle, and the drum brake includes a pair of brakes provided therein. The shoe expands and brakes so that it is mounted on the rear wheel of a car. At this time, the drum brake mounted on the rear wheel also serves as a parking brake in addition to the main brake role. In more detail, the drum brake is connected to the parking brake lever provided in the interior of the vehicle by a cable, and when the user operates the parking brake lever, the brake shoe pulled by the cable comes into close contact with the brake drum to generate a braking force.

Meanwhile, in recent years, a disc brake is used instead of a drum brake in the rear wheel of a car. Thus, when a disc brake is used in the rear wheel, a parking brake is provided separately from the disc brake, and this is a DIH (Drum In Hat) brake.

The DIH brake is provided with a drum brake inside the disc brake, as shown in FIG. 1, a mounting plate 1, a pair of brake shoes 2 installed on the front of the mounting plate 1, and It is provided between the lower end of the pair of brake shoes 2 and the operating lever 4 to expand the brake shoe when operating the parking brake lever (not shown), and is provided between the upper end of the pair of brake shoes 2 and the brake shoe 2 And a gap adjuster 5 for adjusting a gap between the drum and a drum (not shown), and a return spring 6 coupled to the lower portion of the pair of brake shoes 2.

When the operation lever 4 is moved by the operation of the parking brake lever, the brake shoe 2 extends toward the drum fixed to the wheels so that the lining 3 mounted on the brake shoe 2 and the drum are rubbed with each other. When the braking force is generated and the parking braking force is released by operating the parking lever again, the brake shoe 2 is returned to its position by the elastic force of the return spring 6.

At this time, the role of the return spring (6), the brake brake (2) in the front and rear direction when the vehicle releases the parking brake lever to prevent the brake shoe (2) from moving by the impact of the road surface, the operation lever when the parking brake operation After the brake shoe 2 is pushed by (4) and the parking brake is released, the brake shoe 2 serves to restore the brake shoe 2 back to its initial position.

However, the DIH brake according to the related art does not return to the original length of the return spring 6 even when the parking brake is released because the return spring 6 has been extended for a long time when the vehicle is parked for a long time. There is this. In this way, when the return spring 6 does not return to its original length, the brake shoe 2 remains in contact without being completely removed from the brake drum. Therefore, when the vehicle is operated in the above state, the brake shoe ( 2) due to the friction of the drum and fuel economy decreases.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and an object thereof is to provide a DIH brake capable of returning a brake shoe to its original position even if the vehicle is parked for a long time.

DIH brake according to the present invention for achieving the above object, the brake drum to rotate with the wheel of the vehicle; A brake shoe in contact with the brake drum to generate a braking force; It is characterized in that it comprises a; operating unit for generating the hydraulic pressure by the operating force of the parking cable connected to one side to expand the brake shoe to the brake drum side.

The operation unit may include: a first cylinder connected to the parking cable and including a first piston generating hydraulic pressure by an operation force of the parking cable; And a second cylinder connected to the first cylinder, the second cylinder including a second piston that transmits hydraulic pressure generated by the movement of the first piston to the brake shoe to provide an expansion force.

The expansion force provided to the brake shoe is preferably generated by moving the second piston as the brake oil in the first cylinder flows into the second cylinder by the movement of the first piston.

Preferably, the first cylinder or the second cylinder is further provided with a return spring for providing a return force to the first piston or the second piston.

Preferably, the first cylinder or the second cylinder is further provided with a sealing portion for preventing the brake oil from leaking inside the first cylinder or the second cylinder.

As described above, according to the DIH brake according to the present invention, in addition to the return force by the return spring provided between the pair of brake shoes, the elastic force of the return spring provided in the cylinder and the force by the vacuum formed inside the cylinder In addition, since the brake shoe is pulled up, even when the vehicle is parked for a long time, the brake shoe is surely separated from the brake drum regardless of the increase in the return spring.

In addition, according to the DIH brake according to the present invention, since the brake shoe is controlled by hydraulic pressure, the operation noise of the brake can be reduced, and the brake performance is improved by applying the parking cable pulling force by the hydraulic pressure to the brake shoe. .

In addition, conventionally, there was an invalid stroke in which the brake shoe does not move even when the parking cable is pulled due to the play lever gap. However, according to the DIH brake according to the present invention, the brake shoe reacts as soon as the parking cable is pulled to improve the usability and improve the productability. It can be effective.

The present invention, the brake drum to rotate with the wheel of the vehicle; A brake shoe 50 in contact with the brake drum to generate a braking force; And an operating part 10 generating hydraulic pressure by the operating force of the parking cable 40 connected to one side to expand the brake shoe 50 to the brake drum side.

Hereinafter, with reference to the accompanying drawings will be described in detail preferred embodiments of the DIH brake according to the present invention. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even if displayed on different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

Figure 2 is a front view of an embodiment of a DIH brake according to the present invention, Figures 3a and 3b is a cross-sectional view taken along line AA of Figure 2, Figure 3a is a view showing an operating state when the parking brake is released, 3b is a diagram showing an operating state when the parking brake is operated.

As shown in FIG. 2, the DIH brake according to the present invention includes a mounting plate 80, a pair of brake shoes 50 installed on the front surface of the mounting plate 80, and a pair of brake shoes ( Lining 52 provided on the outer surface of the 50, and the operating portion 10 provided between the lower end of the pair of brake shoes 50 to expand the brake shoes when operating the parking brake lever (not shown), and Is provided between the upper end of the pair of brake shoes 50, the adjuster (80) for adjusting the gap between the brake shoe 50 and the brake drum (not shown), and is coupled to the lower pair of brake shoes 50 It is configured to include a return spring (60).

Here, the operating unit 10 provided between the pair of brake shoes 50 is to replace the conventional operating lever structure, as shown in Figure 3a and 3b the first cylinder accommodated in the housing 12 20 and the second cylinder 30 are configured.

The first piston 22 is provided in the first cylinder 20, and the brake oil 26 fills the inside of the first cylinder 20 in the lower portion of the first piston 22. A through hole is formed at a lower side of the first cylinder 20, and the first piston 22 extends outward through a through hole of the first cylinder 20, and a parking cable 40 is engaged at the end thereof. The latch 23 is provided. The parking cable 40 is connected to the parking brake lever provided in the vehicle interior, and configured to be pulled or released when the parking brake lever is operated. Therefore, when the parking cable 40 is pulled by operating the parking brake lever, the first piston 22 connected to the parking cable 40 is pulled downward of the first cylinder 20. In addition, a lower portion of the first piston 22 is provided with a return spring 24 for providing a return force to the first piston 22.

A second piston 32 is provided in the second cylinder 30, and the second piston 32 extends outward through a through hole formed in one side of the second cylinder 30 to extend the housing 12. It is configured to protrude out. Since the second piston 32 moves to operate the brake shoe 50 to be described later, the second piston 32 is installed in the second cylinder 30 in a direction parallel to the operating direction of the brake shoe.

The first cylinder 20 and the second cylinder 30 are connected to each other through a connection passage 28 through the lower one side of the first piston 22 and the upper one side of the second piston 32, respectively. The brake oil 26 inside the first cylinder 20 flows into the second cylinder 30 through the passage 28.

In addition, although not shown in the drawings, a return spring may be provided between the bottom of the second cylinder 30 and the second piston 32 to provide a return force to the second piston 32. 22) and the brake oil 26 inside the cylinder flows out of the through-holes of the first cylinder 20 and the second cylinder 30, which are portions in which the second piston 32 protrudes out of the cylinders 20 and 30. It may be further provided with a sealing portion to prevent being.

One end of the housing 12 and the end of the second piston 32 is provided with a connector 14, respectively, so that the operating unit 10 and the pair of brake shoes 50 are connected to each other.

The present invention has the same function as a general parking brake, that is, when the user pulls the parking cable 40 by operating the parking brake lever provided in the driver's seat of the vehicle, the first piston fixed to the end of the parking cable 40. As the 22 is pulled, the second piston 32 is pushed to one side, and the brake shoe 50 connected to the end of the second piston 32 is pushed toward the brake drum to be in close contact with the brake drum. At the same time, the braking force is generated by closely contacting the other brake shoes 50 connected to one side of the housing 12 through the reaction force of the brake shoes 50 connected to the second piston 32.

Referring to the structural features of the operation unit 10 for such an operation is as follows.

In the present invention, the brake shoe 50 is controlled by hydraulic pressure, whereas the brake shoe 50 is controlled by a mechanical operation. The hydraulic pressure is generated by the brake oil 26 filled in the first cylinder 20 and the second cylinder 30. First, the user operates the parking brake lever to park the vehicle so that the parking cable 40 When pulled, the first piston 22 connected to the parking cable 40 is pulled together, and the brake oil 26 under the first piston 22 is compressed. As described above, when the brake oil 26 is pressurized by the force to which the first piston 22 is pulled, the brake oil 26 flows into the second cylinder 30 through the connection passage 28 and thus the second piston. Push out (32). The pressure acting on the second piston 32 by the brake oil 26 introduced into the second cylinder 30 is transmitted to the brake shoe 50 through the connector 14 connected to the end of the second piston 32. Thus, the brake shoe 50 is extended to the brake drum side.

At this time, the force that the parking cable 40 pulls the first piston 22 is F1, and the force that the second piston 32 pushes the brake shoe 50 is F2, and the cross-sectional area of the first cylinder 20 is A1, When the cross-sectional area of the second cylinder 30 is A2, the magnitude P of the hydraulic pressure inside the first cylinder 20 and the second cylinder 30 is the same, so that [Equation 1] and [Equation 2] are as follows. Is established.

Equation 1 P = F1 / A1 = F2 / A2

[Equation 2] F2 = F1 × A2 / A1

That is, as shown in [Equation 2], the force F2 that the second piston 32 pushes the brake shoe 50 is proportional to the ratio of the cross-sectional area of the second cylinder 30 and the cross-sectional area of the first cylinder 20. It can be seen. Therefore, as in the present embodiment, when the cross-sectional area of the second cylinder 30 is larger than the cross-sectional area of the first cylinder 20, the pulling force of the parking cable 40 pulling the first piston 22 is increased by hydraulic pressure. Since it is transmitted to the brake shoe 50, according to the DIH brake according to the present invention, the brake performance is improved.

On the other hand, when the user wants to release the brake of the parked vehicle, when the user operates the parking brake lever to release the parking cable 40, the pressure of the brake oil 26 by the first piston 22 is released and the brake is released. Since the force applied to the shoe 50 is eliminated, the brake shoe 50 is returned to its original position by the elastic force of the return spring 60.

Meanwhile, when the vehicle is parked, the first piston 22 is pulled down by the tension of the parking cable 40 so that a vacuum is formed on the upper portion of the first piston 22 and the return provided below the first piston 22. The spring 24 is compressed and elastically deformed. After the pulling of the parking cable 40 is released, the first piston 22 is formed by the vacuum force formed on the upper part of the first piston 22 and the elastic force of the return spring 24. ) Is returned to its original position before being pulled by the parking cable 40. As the first piston 22 returns to its original position, the pressure in the first cylinder 20 is lowered so that the brake oil 26 in the second cylinder 30 flows back into the first cylinder 20. When the oil in the second cylinder 30 flows out of the second cylinder 30, the second piston 32 moves along the brake oil 26, so that the brake shoe 50 connected to the second piston 32 Moves to the original position with the second piston 32.

As described above, when the parking brake is released, the brake shoe 50 returns to its original position only by the return spring 60. However, the present invention provides a vacuum force in the cylinder and an elastic force of the return spring 24 provided in the cylinder. The addition provides a return force to the brake shoe 50, so that the return spring 60 is extended during long-term parking so that the brake shoe 50 is kept in contact with the brake drum without returning to place.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea 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 these embodiments. 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.

1 is a front view of a DIH brake according to the prior art.

Figure 2 is a front view of one embodiment of a DIH brake according to the present invention.

3A and 3B are cross-sectional views taken along the line A-A of Fig. 2, respectively, showing an operating state of an embodiment of the DIH brake according to the present invention.

<Description of the symbols for the main parts of the drawings>

10: operating part 12: housing

14: connector 20: the first cylinder

22: first piston 24: return spring

26: brake oil 28: connection passage

30: second cylinder 32: second piston

40: parking cable 50: brake shoe

Claims (5)

A brake drum that rotates with the wheels of the vehicle; A brake shoe in contact with the brake drum to generate a braking force; And An operation unit for generating hydraulic pressure by operating force of the parking cable connected to one side and extending the brake shoe to the brake drum side; DIH brake, characterized in that it comprises a. The method of claim 1, The operation unit, A first cylinder connected to the parking cable, the first cylinder including a first piston generating hydraulic pressure by an operation force of the parking cable; And A second cylinder connected to the first cylinder, the second cylinder including a second piston to provide hydraulic pressure generated by the movement of the first piston to the brake shoe to provide an expansion force; DIH brake, characterized in that consisting of. The method of claim 2, Expanding force provided to the brake shoe, DIH brake, characterized in that generated by the movement of the second piston as the brake oil in the first cylinder flows into the second cylinder by the movement of the first piston. The method according to claim 2 or 3, In the first cylinder or the second cylinder, DIH brake, characterized in that the return spring for providing a return force to the first piston or the second piston. The method of claim 4, wherein In the first cylinder or the second cylinder, DIH brake, characterized in that further provided with a sealing portion to prevent the brake oil in the first cylinder or the inside of the second cylinder is leaked.
KR1020080077017A 2008-08-06 2008-08-06 Dih brake KR20100018306A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020080077017A KR20100018306A (en) 2008-08-06 2008-08-06 Dih brake

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020080077017A KR20100018306A (en) 2008-08-06 2008-08-06 Dih brake

Publications (1)

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KR20100018306A true KR20100018306A (en) 2010-02-17

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Family Applications (1)

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KR1020080077017A KR20100018306A (en) 2008-08-06 2008-08-06 Dih brake

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160076678A (en) 2014-12-23 2016-07-01 주식회사 만도 Parking brake
KR20160148820A (en) 2015-06-16 2016-12-27 현대자동차주식회사 Drum in hat brake disk for vehicle and manufacturing method thereof
DE102017215264A1 (en) 2016-09-05 2018-03-08 Mando Corporation An electronically controlled braking system and method for controlling the same
CN113124072A (en) * 2021-02-26 2021-07-16 江苏开沃汽车有限公司 Multi-brake-shoe drum brake and working method

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160076678A (en) 2014-12-23 2016-07-01 주식회사 만도 Parking brake
KR20160148820A (en) 2015-06-16 2016-12-27 현대자동차주식회사 Drum in hat brake disk for vehicle and manufacturing method thereof
US9829057B2 (en) 2015-06-16 2017-11-28 Hyundai Motor Company Drum in hat brake disk for vehicle and manufacturing method thereof
DE102017215264A1 (en) 2016-09-05 2018-03-08 Mando Corporation An electronically controlled braking system and method for controlling the same
CN113124072A (en) * 2021-02-26 2021-07-16 江苏开沃汽车有限公司 Multi-brake-shoe drum brake and working method
CN113124072B (en) * 2021-02-26 2024-03-12 江苏开沃汽车有限公司 Multi-brake shoe drum brake and working method

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