KR100767305B1 - Booster of brake for a vehicle - Google Patents

Abstract

A booster of a brake for a vehicle is provided to boost the braking force with little brake pedal pushing effort by more reducing the pressure increasing rate in a reaction disk than before an elastic spring is compressed and reducing the increasing rate of the reaction force transferred to a brake pedal. A booster(1) of a brake for a vehicle comprises a boosting ratio control device. The boosting ratio control device includes a reaction disk(80) installed at a rear end of an output rod(90), a power piston, an air valve(11), a tip(13), an elastic spring(15), and a C-ring(17). The air valve includes a hollow cylinder and a groove. The tip includes a disk shaped support part(13a) extended from the outer peripheral surface to the circumferential direction to have predetermined thickness. The elastic spring is installed between the inside of the air valve and the support part of the tip and has predetermined elastic force. The C-ring is mounted in the groove of the air valve.

Description

Booster of Brake for Cars

1 is a cross-sectional view schematically showing a brake booster for a vehicle according to an embodiment of the present invention.

Figure 2 is an enlarged cross-sectional view showing an enlarged internal structure of the power ratio adjustment mechanism according to an embodiment of the present invention.

Figure 3 is an enlarged cross-sectional view showing an enlarged internal structure of the power ratio ratio adjustment mechanism according to an embodiment of the present invention.

4 is a power characteristic diagram showing the relationship of the output to the input of the power ratio ratio adjustment mechanism of the brake booster for a vehicle according to an embodiment of the present invention.

Figure 5 is an enlarged cross-sectional view showing an enlarged internal structure of the power ratio ratio adjustment mechanism of the brake booster for a vehicle according to another embodiment of the present invention.

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

1: car brake booster 10: power ratio adjustment mechanism

11, 11 ': air valve 11a, 11'a: hollow cylinder portion

11b groove 11'b: tip support

13 tip 13a support

15 elastic spring 17 searing

20: front chamber 22: front cell

24a, 24b: front positive and transformer chamber 26: front support

28: front diaphragm 30: rear chamber

32: rear cell 34a, 34b: rear positive pressure transformer chamber

36: rear support 38: rear diaphragm

40: control valve 50: power piston

60: push rod 80: reaction disc

90: output rod 92: air intake

The present invention relates to a brake booster for an automobile, and more particularly, the present invention provides a reduction in the internal pressure increase rate of a reaction disk that transmits reaction force as the elastic spring provided inside the air valve is compressed. It relates to a booster for automobile brakes, in which a rate of increase of reaction force transmitted to the brake pedal (B / P) is reduced so that a secondary power ratio is generated.

Early cars were very slow and light. In other words, the need for a brake was not urgent. However, due to the rapid development of automobile technology, the speed of automobiles has gradually increased, and the weight of automobiles has gradually increased due to the increase of internal and external parts. As such, mass and acceleration, which are the main factors of vehicle inertia, have been increased in synergy with each other, and interest in safety while driving has also increased.

As a result, various researches and developments have been made to improve the braking performance of automobiles, and as a result of these efforts, the recent rapid development is the booster of brake.

In general, a vehicle is provided with a braking device that serves to slow down or stop the vehicle speed while driving.

The braking device includes a booster for doubling the input of the brake pedal using a vacuum pressure (engine suction pressure) generated by the engine power, and according to the pressure doubled by the booster. And a master cylinder for forming brake oil hydraulic pressure in the brake circuit, and a caliper or drum brake for slowing or stopping the rotation speed of the wheel by the brake oil pressure.

Here, the booster is a vacuum type using a negative pressure of the engine intake manifold and an air type using a pressure provided from a compressor driven by the engine, and a vacuum type is generally used in a small vehicle.

However, since these boosters have a fixed area and a reaction disc area of the air valve that determine the power ratio, the driver realizes a single power ratio in which the output also increases at a constant rate while the transmitted input is raised. The driver must apply more force to the brake pedal (B / P) to improve the braking effect or shorten the braking distance, and the braking distance will be longer when braking by the driver's physical condition or driver's position in normal braking. In addition, there is a problem that the braking force cannot be generated due to the large output with a small input when the high speed is decelerated in an emergency situation.

The present invention has been made in order to improve the conventional technical problems as described above, the booster of the present invention includes a hollow cylinder portion extending from one end by a predetermined length, the air is formed in the circumferential direction on one end inner peripheral surface of the hollow cylinder portion And a rear end surface is spaced apart from the inner surface of the air valve (a), the front end surface is spaced from the reaction disk (b), and is disposed in the circumferential direction from a predetermined position on the outer circumferential surface. A tip including a disk-shaped support extending to have a predetermined thickness; and an elastic spring provided between the inside of the air valve and the support of the tip, the elastic spring having a predetermined elastic force, and seated on a groove of the air valve. By providing a power ratio ratio adjustment mechanism comprising a; C-ring is assembled to contact the support, The purpose of the present invention is to provide a booster for an automobile brake that generates a large output with a small input when a high speed is decelerated in an emergency situation and brings driving stability due to improved braking performance.

The present invention for achieving the above object comprises a hollow cylinder portion extending from one end by a predetermined length, the air valve groove is formed in the circumferential direction on one inner circumferential surface of the hollow cylinder portion; and is provided inside the hollow cylinder portion of the air valve The rear end face is spaced apart from the inner side of the air valve (a), the front end face is spaced apart from the reaction disc (b), and a tip including a disk-shaped support portion extending to have a predetermined thickness in a circumferential direction from a predetermined position on the outer circumference. And an elastic spring provided between the inside of the air valve and the support of the tip, the elastic spring having a predetermined elastic force, and a C-ring seated in the groove of the air valve and assembled to contact the support of the tip. It is characterized by including a power ratio adjustment mechanism comprising.

And, by adjusting the size of the tip outer diameter of the tip, it is possible to adjust the primary power ratio, a pre-force is applied to the elastic spring, the starting point of the double force can be adjusted by adjusting the applied preload.

In addition, the secondary power ratio can be adjusted by adjusting the spring constant of the elastic spring.

And the end point of the double back force can be adjusted by adjusting the space | interval a between the inner surface of a air valve, and a tip.

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

First, among the technical components of the present invention, the front cell 22 constituting the front chamber 20 of the booster 1, the front positive and transformer chambers 24a and 24b, the front support 26, and the front diaphragm 28 , The rear cell 32 constituting the rear chamber 30, the rear positive and transformer chambers 34a and 34b, the rear support 36, the rear diaphragm 38, the center plate 3, the control valve 40, Since the power piston 50, the push rod 60, the air valve 11, the air suction unit 92, and the like are well known technologies, detailed descriptions thereof will be omitted herein, and the tip 13 in the air valve 11 may be omitted. And an elastic spring 15 to generate a secondary power ratio.

1 is a cross-sectional view schematically showing an automobile brake booster according to an embodiment of the present invention, Figure 2 is an enlarged cross-sectional view showing an enlarged internal structure of the power ratio adjustment mechanism according to an embodiment of the present invention, Figure 3 Is an enlarged cross-sectional view showing an enlarged internal structure of the power ratio adjustment mechanism according to an embodiment of the present invention, Figure 4 is an output of the input to the input of the power ratio ratio adjustment mechanism of the brake booster for an automobile according to an embodiment of the present invention. 5 is an enlarged cross-sectional view showing an enlarged internal structure of the power ratio ratio adjustment mechanism of the brake booster for a vehicle according to another embodiment of the present invention.

That is, as shown in Figure 1, the booster 1 of the brake for the vehicle according to the present invention, the front and rear cells (22, 32) is the interior of the front positive and transformer chambers (24a, 24b) and the rear sealedly coupled Front and rear chambers 20 and 30 provided with front and rear diaphragms 28 and 38, which are divided into forward and rear chambers 34a and 34b, and a center plate 3 in the center thereof, and the front and rear chambers ( A control valve 40 and an air valve 11 for controlling communication of vacuum or atmosphere to the 20 and 30, a power piston 50 interlocking with the front and rear diaphragms 28 and 38, and the control valve ( A brake pedal (B / P) interlocked with 40, an input rod and an output rod (90) interlocked by the brake pedal (B / P), and the power piston (50) at an end of the output rod (90). It comprises a reaction disk 80 in contact with the central portion of the power piston 50 receives the force of displacement.

And, the second power ratio ratio adjustment mechanism 10 according to an embodiment of the present invention includes a hollow cylinder portion (11a) extending from one end by a predetermined length, the circumferential direction on one end inner circumferential surface of the hollow cylinder portion (11a) An air valve 11 having a groove 11b formed therein; and a rear end surface of the air valve 11 a spaced apart from an inner surface of the air valve 11. a tip 13 comprising a disc-shaped support portion 13a which forms a), and a front end surface is spaced apart from the reaction disk 80 and extends to have a predetermined thickness in a circumferential direction from a predetermined position on an outer circumferential surface; And an elastic spring 15 provided between the inner side of the air valve 11 and the support portion 13a of the tip 13 and having a predetermined elastic force; and the groove 11b of the air valve 11. C-ring, 1, which is mounted on the tip 13 and assembled to contact the support part 13a of the tip 13 7); including.

The operation of the power ratio ratio adjusting mechanism 10 of the brake booster for an automobile according to the exemplary embodiment of the present invention configured as described above will be described with reference to FIGS. 2 and 3.

First, as negative pressure is generated in the engine (not shown), the inside of the booster is always in a vacuum state while the front positive / transformer chambers 24a and 24b and the rear positive / transformer chambers 34a and 34b are always in a vacuum state. do.

At this time, when the driver presses the brake pedal B / P for braking to advance the input rod, the front end of the control valve 40 is separated from the air valve 11 and interlocked with the power piston 50. .

In this process, the communication between the front positive and negative pressure transformer chambers 24a and 24b and the rear positive and negative pressure transformer chambers 34a and 34b is interrupted, and the air of the outside air is interposed between the control valve 40 and the air valve 11. The air inlet 92 and the transformer passage (not shown) enter the vacuum front and rear transformer chambers 24b and 34b.

In addition, the external air is momentarily introduced into the front and rear transformer chambers 24b and 34b by the differential pressure, so that the front support 26, the front diaphragm 28, the rear support 36, and the rear diaphragm 38, which are operable, It is pushed with the power piston 50.

Therefore, the output by the pressure difference is transmitted through the reaction disk 80 to the master cylinder (not shown) through the output rod 90 to generate a braking pressure, the pressure is transmitted to the wheel cylinder (not shown) It will brake.

In the above process, the force transmitted from the power piston 50 acts on the reaction disk 80.

Therefore, when the driver drives the brake pedal B / P, the power piston 50 is advanced by the pressure difference as the outside air flows in.

In addition, the force generated by the center plate 13 (see FIG. 1) due to the pressure difference acts in the direction from the larger side to the smaller side, so that the power piston 50 has the front and rear constant pressure chambers 24a and 34a. The reaction disc 80 through the power piston 50-> reaction disc 80-> output rod 90 through the center of the power piston 50, In this case, the reaction disk 80 is compressed by the reaction force of the output rod 90 to generate pressure therein. This is because the reaction disk 80 is formed of a rubber material.

In addition, until the reaction disk 80 deformed by the pressure generated inside the reaction disk 80 narrows the gap b and comes into contact with the tip of the tip 13 until a constant input F _in . The output F _out rises to the jump-in point (J), after which the ratio between the output obtained by the pressure difference and the pressure exerted by the brake pedal (B / P) is determined by the reaction disc. (80) It is determined by the ratio of the area of the tip to the tip (13), and the output (F _out ) rises up to the point K (knee point) in proportion to the continuously rising input (F _in ) to generate the primary power ratio. (See Figure 4)

At this time, it is possible to adjust the size of the outer diameter of the tip 13, which is to reduce the size of the outer diameter of the tip 13, the area ratio of the area of the reaction disk 80 and the tip 13 is increased 1 The vehicle power ratio can be increased, but if the size of the outer diameter of the tip 13 is increased, the area ratio between the area of the reaction disk 80 and the tip 13 is reduced, thereby reducing the first power ratio and tuning the power ratio. (tunning) is possible.

On the other hand, as described above, when the driver raises the input F _in above the K point through the brake pedal B / P, the elasticity provided between the tip 13 and the air valve 11 is provided. The tip 13 is moved inside the air valve 11 by compressing the spring 15 so that the reaction disc 80 is deformed and pushed in accordance with the increase in the internal pressure, thereby increasing the distance b. Thus, the space c is increased.

At this time, as the space c increases, the rate of increase of the internal pressure of the reaction disk 80 becomes smaller than before the elastic spring 15 is compressed, which results in the brake pedal B / P. R (run), which generates a large output F _out , even with a small rising width of the input F _in (the width of the rising input F _in from the K point to the R point) as the rate of increase of reaction force transmitted toward the side decreases. to the point out, a secondary force ratio is generated (see FIG. 4), the secondary force ratio being greater than the primary force ratio before compression of the elastic spring 15.

Here, the spacing a is made larger than the spacing b, which is caused by the deformation of the reaction disk 80 as the tip 13 contacts the inner surface of the air valve 11. The interval a is for increasing the interval b by zero, so that the rate of increase in reaction force is preferably lowered.

In addition, by applying a pre-force to the elastic spring 15, the rate of increase of the reaction force compressing the elastic spring 15 can be preferably lowered, and the timing of the second back force is adjusted by adjusting the preload. I can adjust it.

In addition, the spring constant of the elastic spring 15 can be adjusted. If the spring constant is small, the spacing (b) can be easily increased, resulting in an increase in the secondary power ratio.

In addition, the distance (a) between the inner surface of the air valve 11 and the tip 13 can be adjusted. If the distance (a) is reduced, the end point of the secondary power is increased, and conversely, The end point of the secondary power may be delayed, resulting in adjustment of the end point of the secondary power.

On the other hand, another embodiment of the present invention, as shown in Figure 5, includes a hollow cylinder portion (11 'a) extending from one end by a predetermined length, one end of the hollow cylinder portion (11' a) to the inside An air valve 11 'including a tip support portion 11'b formed by deformation due to external force; and a rear end surface of the air valve 11' provided inside the hollow cylinder portion 11'a of the air valve 11 '. A disk spaced apart from the inner surface of the air valve 11 ′, and a front end surface of the air valve 11 ′ forms a space b with the reaction disk 80. A tip 13 including a support portion 13a; and an elastic spring 15 provided between an inner side of the air valve 11 'and a support portion 13a of the tip 13, and having a predetermined elastic force. By providing the power ratio ratio adjustment mechanism 10 including preferably, The same effect as in one embodiment can be realized, and the tip 13 is preferably supported by the tip support 11'b, thereby eliminating a C-ring, thereby reducing the power ratio adjustment mechanism 10. Simplifying the structure has the advantage of cost reduction.

And, as in the embodiment of the present invention, the size of the outer diameter of the tip 13 may be adjusted. When the size of the outer diameter of the tip 13 is made small, the area of the reaction disk 80 and the tip ( 13) The area ratio of the tip may be increased to increase the primary power ratio, but when the size of the outer diameter of the tip 13 is increased, the area ratio of the area of the reaction disk 80 and the tip 13 is decreased. The primary power ratio is reduced, enabling power ratio tuning.

In addition, the spacing a is made larger than the spacing b, as the deformed reaction disk 80 contacts the tip 13 to the inner side of the air valve 11 '. The spacing a is for increasing the spacing b to be zero, so that the rate of increase of reaction force is preferably lowered.

In addition, by applying a pre-force to the elastic spring 15, the rate of increase of the reaction force compressing the elastic spring 15 can be preferably lowered, and the timing of the second back force is adjusted by adjusting the preload. I can adjust it.

And, it is possible to adjust the spring constant of the elastic spring 15, if the spring constant is reduced, the spacing (b) is easily increased, it can bring an effect of increasing the secondary power ratio.

In addition, the distance (a) between the inner surface of the air valve (11 ') and the tip 13 can be adjusted. If the distance (a) is reduced, the end point of the secondary power is increased, and vice versa. In this case, the end point of the secondary power may be delayed, and as a result, the end point of the secondary power may be adjusted.

Therefore, as described above, the booster of the automobile brake according to the present invention includes a hollow cylinder portion extending from one end by a predetermined length, and an air valve having grooves formed in a circumferential direction on one inner circumferential surface of the hollow cylinder portion; and the hollow of the air valve. The rear end surface is provided in the cylinder portion and the rear end face is spaced apart from the inner side of the air valve, the front end face forms a gap (a) with the reaction disk, the outer peripheral surface is formed in the disk-shaped support portion extending to have a predetermined thickness in the circumferential direction A tip comprising; an elastic spring provided between the inside of the air valve and the support of the tip, the spring having a predetermined elastic force; and a seed ring seated in the groove of the air valve and assembled to contact the support of the tip. By having a power ratio ratio adjustment mechanism comprising a; elastic soup provided on the inside of the air valve As the compression increases, the internal pressure increase rate of the reaction disc that transmits the reaction force is smaller than before the elastic spring is compressed, so that the increase rate of the reaction force transmitted to the brake pedal becomes smaller, thereby creating a secondary power ratio, which provides a large output even with a small input of the brake pedal. Accordingly, it is possible to increase the braking force, thereby improving the braking distance and braking stability and enabling the driver to high speed in an emergency.

The booster of the automobile brake according to the present invention configured as described above includes a hollow cylinder portion extending from one end to a predetermined length, and having an groove formed in a circumferential direction on one inner circumferential surface of the hollow cylinder portion; and the inside of the hollow cylinder portion of the air valve. The rear end surface is provided with a spacing (a) with the inner surface of the air valve, the front end surface with the reaction disk (b), the outer peripheral surface of the disk-shaped support portion formed to extend in a circumferential direction from a predetermined position A tip comprising; an elastic spring provided between the inside of the air valve and the support of the tip, the spring having a predetermined elastic force; and a seed ring seated in the groove of the air valve and assembled to contact the support of the tip. By having a power ratio ratio adjustment mechanism comprising a; elastic spring provided inside the air valve As it is contracted, the internal pressure increase rate of the reaction disc that transmits the reaction force is smaller than before the elastic spring is compressed, so that the reaction force rate that is transmitted to the brake pedal becomes smaller, and thus the secondary power ratio is generated, and according to the large output even with the small input of the brake pedal. It can increase the braking power and improve the braking distance and braking stability, and enable the driver to high deceleration in case of emergency.

In addition, in another embodiment of the present invention, by including a hollow cylinder portion extending from one end by a predetermined length, one end of the hollow cylinder portion having an air valve including a tip support portion formed by deformation inwardly, thereby achieving the same secondary power ratio In addition to the cost savings, the structure is simplified.

While the invention has been shown and described with respect to particular embodiments, it will be appreciated that the invention can be varied and modified without departing from the spirit or scope of the invention as set forth in the claims below. It will be appreciated that those skilled in the art can easily know.

Claims (14)

A power piston 50 having a center of the reaction disk 80 provided at the rear end of the output rod 90 and an air valve 11 in contact with the front end of the push rod 60 operating in front and rear in conjunction with the brake pedal. In the booster (1) comprising a, An air valve 11 including a hollow cylinder portion 11a extending from one end by a predetermined length, and having a groove 11b formed in a circumferential direction on one inner circumferential surface of the hollow cylinder portion 11a; and It is provided in the hollow cylinder portion 11a of the air valve 11 so that the rear end face forms a gap a with the inner side surface of the air valve 11, and the front end face is spaced apart from the reaction disk 80. b) and a tip 13 including a disk-shaped support 13a extending to have a predetermined thickness in a circumferential direction from a predetermined position on the outer circumferential surface; and An elastic spring 15 provided between the inside of the air valve 11 and the support part 13a of the tip 13, and having a predetermined elastic force; and A c-ring (17) mounted on the groove (11b) of the air valve (11) and assembled to contact the support (13a) of the tip (13); Booster for automobile brakes comprising a power ratio ratio adjustment mechanism (10) comprising a. 2. The booster of claim 1, wherein the primary power ratio is adjustable by adjusting the size of the outer diameter of the tip of the tip. The booster of claim 1, wherein a pre-force is applied to the elastic spring (15). 4. A booster for an automobile brake according to claim 3, wherein the starting point of the double back force can be adjusted by adjusting the preload applied to the elastic spring (15). 2. The booster of claim 1, wherein the secondary power ratio is adjustable by adjusting the spring constant of the elastic spring (15). 2. The booster of claim 1, wherein the end point of the double back force is adjustable by adjusting a distance (a) between the inner surface of the air valve (11) and the tip (13). The booster of claim 1, wherein the interval a is greater than the interval b. A power piston 50 in which a reaction disk 80 provided at the rear end of the output rod 90 and an air valve 11 'which is in contact with the front end of the push rod 60 operating in conjunction with the brake pedal are operated in the center. In the booster (1) comprising An air valve 11 including a hollow cylinder portion 11'a extending from one end by a predetermined length, and one end of the hollow cylinder portion 11'a including a tip support portion 11'b formed by deforming inwardly. ');Wow It is provided inside the hollow cylinder portion 11'a of the air valve 11 ', and a rear end surface forms a gap a with an inner side surface of the air valve 11', and the front end surface is the reaction disk 80. A tip 13 comprising a disc-shaped support 13a extending from the outer circumferential surface at a predetermined position in a circumferential direction to form a distance b); An elastic spring 15 provided between the inside of the air valve 11 'and the support part 13a of the tip 13, the elastic spring 15 having a predetermined elastic force; Booster for automobile brakes comprising a power ratio ratio adjustment mechanism (10) comprising a. 9. The booster of claim 8, wherein the primary power ratio is adjustable by adjusting the size of the outer diameter of the tip of the tip. 9. The booster of claim 8, wherein a pre-force is applied to the elastic spring (15). 11. The booster of claim 10, wherein the starting point of the double back force is adjustable by adjusting the preload applied to the elastic spring (15). 9. The booster of claim 8, wherein the secondary power ratio is adjustable by adjusting the spring constant of the elastic spring (15). 9. The booster of claim 8, wherein the end point of the double back force is adjustable by adjusting a distance (a) between the inner surface of the air valve (11 ') and the tip (13). 9. The booster of claim 8, wherein the interval (a) is greater than the interval (b).

Images