KR20080093179A - Mechanical emergency braking assistance device typed vacuum brake booster - Google Patents

Abstract

A vacuum brake booster with a mechanical emergency braking assistance device is provided to flow atmospheric pressure to a variable pressure chamber of a chamber unit by forming an atmosphere flowed space, using difference of relative speeds and relative distance between a plunger and a control valve. A vacuum brake booster with a mechanical emergency braking assistance device comprises a control valve unit(10), an operation plunger(12), a chamber unit(30), and a sleeve assembly(17). The control valve unit is installed with an operation plunger interlocking with an operating rod(1), and placed with a reaction disk(13) and a reaction piston(14) sequentially. The operation plunger includes an extension bar position end and a stopper position end. The sleeve assembly includes a sleeve, a stopper(19), and a stopper spring.

Description

Mechanical emergency braking assistance device typed vacuum brake booster

1 is a block diagram of a vacuum brake booster having a mechanical emergency braking assistance device according to the present invention;

Figure 2 (a), (b) is a stopper fixed type sleeve assembly configuration diagram used in the vacuum brake booster according to the present invention

3 (a) to (c) is an operating state diagram during normal braking and rapid braking operation of the stopper fixed type sleeve assembly used in the vacuum brake booster according to the present invention.

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

1: Operating rod 10: Control valve unit

11: valve housing 11a: stopper channel

11b: sleeve engagement end 12: working plunger

12a: Extension bar position end 12b: Stopper position end

13: reaction disc 14: reaction piston

15,21: spring 16: extension bar

17: sleeve assembly 18: sleeve

18a: stopper insertion groove 19: stopper

19a: stopper body 19b: spring locking end

19c: Plunger contact end 20: Stopper spring

30: chamber unit

The present invention relates to a vacuum brake booster, and more particularly to a vacuum brake booster having a mechanical emergency braking assistance device.

In general, a brake system for braking a vehicle in motion uses hydraulic pressure to back up the driver's brake pedal operation force, thereby implementing braking performance with less force.

However, the brake pedal of such a brake system has a return spring mounted for restoring upon operation release and always generates a restoring force in the opposite direction in which the driver presses the pedal. In the case of a driver including a beginner, a female driver, and an elderly person who do not generate sufficient pedal operation force required during sudden deceleration, an unexpectedly insufficient pedal operation force may be unexpectedly generated during sudden braking.

Accordingly, BAS (Brake Assist System), a braking assistance device that can fully support braking performance by assisting the driver's brake pedal force during sudden braking, is being applied. Such BAS is typically a solenoid valve and a brake pedal movement detection sensor. It is expensive and requires an electronic BAS that requires a hydraulic unit to operate, and a mechanical BAS method that is relatively inexpensive compared to the electronic but amplifies the small force of the brake pedal with a large force. do.

Among these BASs, the mechanical BAS should be able to increase the braking force rapidly due to the rapid inflow of atmospheric pressure into the booster chamber in the case of the driver's sudden braking demand, and for this purpose, for example, by using an amateur and a permanent magnet During a sudden braking, the armature is pulled by the permanent magnet so that the control valve in the booster stays open and supplies atmospheric pressure to the working chamber.

However, in the case of rapid braking, it is most important for the mechanical BAS to allow atmospheric pressure to enter the booster operating chamber more quickly and quickly.However, in the case of the BAS operation using the magnetic force of the permanent magnet, the judgment of the sudden braking is determined by the amateur of the control valve body. Based on the relative speed between the magnet and the permanent magnet, there is a vulnerability that implies the possibility of delay in emergency operation.

Accordingly, there is a demand for the development of a method in which a mechanical BAS realizes quicker and faster operation during rapid braking, and the atmospheric pressure is rapidly supplied to the working chamber to maintain the control valve in the booster.

Accordingly, the present invention has been made in view of the above-mentioned matters, and secures a rapid air inflow space through the relative speed and distance difference between the control valve body and the plunger in the booster, that is, when the input speed due to the brake pedal effort is high, the operation plunger As the control valve body does not have sufficient air inflow compared to the progress stroke of the air, the air inflow space is secured by using the relative distance to make the air inflow fast and sufficient to achieve rapid emergency power operation. The purpose is to provide a mechanical BAS.

In addition, the present invention is achieved by implementing the BAS for securing the air inlet space through the relative speed and distance difference between the control valve body and the plunger during braking, reciprocating forward and backward in the plunger valve and the control valve moved through the operating rod Accordingly, the object of the BAS component to be implemented in a simple mechanism (Mechanism).

The present invention for achieving the above object, the vacuum plunger booster is located in the inner space of the valve housing forming the overall shape is an operation plunger interlocked with the operating rod which is axially moved when operating the brake pedal, the tip of the valve housing And a control valve unit in which the reaction disc and the reaction piston pressurized by the actuating plunger are sequentially positioned;

One end is pressed against the operating rod and the opposite side forms an extension bar position end in a stepped shape on an axis formed with a small diameter to press the reaction disc side, and the tip portion forming the extension bar position end is inclined to form a cone shape. An actuating plunger forming a stopper position end thereof;

A chamber unit for introducing atmospheric pressure into a negative pressure chamber (vacuum) and a transformer chamber (atmospheric pressure) in which the inside thereof is divided through a diaphragm according to the operation of the control valve unit to form a vacuum negative pressure for operating the master cylinder;

A sleeve having a stopper insertion groove coupled to the outside of the sleeve engagement end of the valve housing and elastically supported by a spring, and having a stopper insertion groove opened at a T-shape at one end thereof, and being raised / lowered from the sleeve according to a linear movement direction of the operation plunger, A sleeve assembly comprising a stopper for allowing retraction / forward movement and a stopper spring for applying an elastic force to press the stopper toward the operative plunger;

Characterized in that consisting of.

And, the sleeve is made of a hollow tube shape to be fitted to the outside of the sleeve coupling end of the valve housing constituting the control valve unit, the stopper insertion groove of the outer peripheral surface of the T-shaped portion formed in a narrow width toward the reaction disk It is done.

In addition, the stopper is formed of a stopper body inserted into the T-shaped stopper insertion groove formed in the sleeve while forming a plate shape of a predetermined thickness, the stopper spring for pressing the stopper toward the operation plunger is mounted to the upper portion of the stopper body A spring engaging end is formed, and the lower end of the stopper body is formed with a length having a width smaller than that of the stopper body, and the end surface thereof has a semicircular plunger contact end contacting the stopper position of the actuating plunger. Is formed.

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

1 is a block diagram of a vacuum brake booster having a mechanical emergency braking assistance apparatus according to the present invention, the present invention is introduced into the atmospheric pressure depending on whether the operation of the brake pedal in addition to the pedal pressure and atmospheric pressure and vacuum The vacuum brake booster which operates the master cylinder which supplies hydraulic pressure to the wheel cylinder (or caliper) which performs wheel braking by the back force through the pressure difference of the liver,

The control valve unit 10 is operated through the operating rod 1 axially moved by the depression amount of the brake pedal, and the diaphragm flows into the negative pressure chamber (vacuum) and the transformer chamber (atmospheric pressure) in which the inside is partitioned. An actuating plunger 12 which is axially moved by the chamber unit 30 which forms the vacuum negative pressure for operating the master cylinder through the supplied atmospheric pressure according to the operation of the control valve unit 10 and the operating rod 1 during rapid braking. It is composed of a mechanical BAS (Brake Assist System) which is linked to and secures an air inflow space.

Here, the BAS is composed of a sleeve assembly (17) interlocked with the actuating plunger (12) axially moved by the operating rod (1) during braking, the sleeve assembly (17) is a control valve unit (10) To form an air inlet space between the actuating plunger 12 through the relative speed and distance difference formed with respect to) and to resist the reaction force of the reaction piston 14 applied at the tip of the actuating plunger 12. do.

In addition, the control valve unit 10 is an internal space of the valve housing 11 constituting the overall shape, the operation plunger 12 is interlocked with the operating rod 1 that is axially moved when the brake pedal is operated, The reaction disk 13 and the reaction piston 14, which are pressurized by the actuating plunger 12, are sequentially positioned and connected to the chamber unit 30 as the tip portion of the valve housing 11.

In addition, the control valve unit 10 is provided with a spring 15 to apply a restoring force upon returning to the initial position of the reciprocating operating rod 1, as in a conventional structure, and is also perpendicular to the longitudinal axis of the booster. An extension bar 16 is provided to extend and move in the axial direction.

In addition, the BAS mounted on the control valve unit 10 is pushed up through the operating plunger 12 when the operating plunger 12 moves through the operating rod 1 which moves abruptly in the axial direction during rapid braking. By retreating the valve portion of the control valve unit 10 in order to secure the air inflow space, the inflow of atmospheric pressure between the operation plunger 12 and the control valve unit 10 causes the transformer chamber (atmospheric pressure) of the chamber unit 30 to be moved. Will continue to work towards

Then, the BAS is mounted to the valve housing 11 formed in the control valve unit 10 so as to be operated in association with the linear movement of the actuating plunger 12 positioned inwardly, as shown in FIG. Made of a sleeve assembly (17) coupled using the valve housing (11),

The sleeve assembly 17 has a sleeve 18 engaged outwardly of the sleeve engagement end 11b to receive an actuating plunger 12 inserted into the sleeve engagement end 11b of the valve housing 11. The stopper 19 and the stopper 19 which are raised / lowered from the sleeve 18 according to the linear movement direction of the actuating plunger 12 to enable the retraction / forward movement of the sleeve 18. It is composed of a stopper spring 20 for applying an elastic force to press toward).

Here, the actuating plunger 12 forms an extension bar position end 12a in a stepped shape on an axis formed with a small diameter such that one end is pressed against the operating rod 1 and the opposite side is pressed against the reaction disk 13. The tip end portion forming the extension bar position end 12a forms a stopper position end 12b inclined to form a cone shape.

In addition, the sleeve 18 is formed in a hollow tube shape so as to fit outside the sleeve engaging end 11b of the valve housing 11 constituting the control valve unit 10, the outer peripheral surface of the stopper opened in a T-shape A portion where the insertion groove 18a is formed in the direction of the forward movement of the actuating plunger 12, that is, the narrow width at the head of the T-shape, is formed toward the reaction disk 13.

At this time, the stopper insertion groove (18a) is formed in the T-shape, the stopper 19 is a T-shaped stopper through the stopper position end 12b of the actuating plunger 12 when the actuating plunger 12 is moved forward As it is lifted up from the insertion groove 18a, the restraining force between the stopper 19 and the sleeve 18 is released so that the sleeve 18 itself is retracted to the rear to secure the air inflow space through the control valve unit 10. It works.

In addition, the coil spring 21 is coupled to the sleeve 18, which applies an elastic restoring force when the sleeve 18 returns to the initial counterpart after the retreat movement.

The stopper 19 is formed of a stopper body 19a inserted into a T-shaped stopper insertion groove 18a formed in the sleeve 18 while forming a plate shape having a predetermined thickness, and of the stopper body 19a. The upper end is formed with a spring engaging end (19b) for mounting the stopper spring 20 for pressing the stopper 19 toward the operation plunger 12, the lower portion of the stopper body (19a) of the stopper body (19a) In addition to being formed with a length having a width smaller than the width, a semicircular plunger contact end 19c is formed in contact with the stopper position end 12b of the actuating plunger 12.

At this time, the width of the plunger contact end (19c) has a width suitable for moving along the narrow portion of the T-shape forming the stopper insertion groove (18a) of the sleeve (18).

In addition, the stopper spring 20 is fitted to the spring engaging end (19b) of the stopper 19 to form a structure in which one end is cut so as to be fixed while surrounding the outer peripheral surface of the valve housing (11).

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

Brake booster of the present invention is a normal operation, that is, the normal booster operation is performed in a situation that is not a sudden operation of the brake pedal, and in the case of rapid braking when a rapid air inlet space is formed in the mechanical BAS (Brake Assist System), booster By using the relative speed and distance difference between the internal control valve unit 10 and the operation plunger 12, there is a feature that can implement a quick emergency power.

The brake booster of the present invention has a chamber unit 30 having a negative pressure chamber (vacuum) and a transformer chamber (atmospheric pressure) partitioned therein through a diaphragm, as shown in FIG. 1, to the depression amount of the brake pedal. It is operated through the control valve unit 10 via the operating rod 1 axially moved by it, and the mechanical BAS associated with the behavior of the control valve unit 10 is activated during rapid braking of the input speed by the driver's effort. That is, the atmospheric pressure inflow path is secured through the control valve unit 10 in association with the behavior of the operation plunger 12, so that sufficient air inflow is provided compared to the traveling stroke of the operation plunger 12 pressurized by the operating rod 1. This will prevent the situation.

This includes an actuating plunger 12 which is moved forward by the pressing force of the operating rod 1, a reaction disc 13 and a reaction piston which are sequentially positioned at the leading end of the actuating plunger 12 to operate the chamber unit 30. It is realized as the mechanical BAS is further coupled to the control valve unit 10 with 14.

 That is, the sleeve assembly 17 constituting the mechanical BAS is coupled to the sleeve of the valve housing 11 in which the sleeve 18 forms the control valve unit 10, as shown in FIGS. 2A and 2B. A stopper 19 coupled to the end 11b outward and releasing the restraining force to enable the retraction movement of the control valve unit 10 to the stopper insertion groove 18a opened in a T-shape formed in the sleeve 18. The stopper spring 20 which is fitted into the stopper 19 and presses the stopper 19 toward the operation plunger 12 positioned inwardly of the sleeve 18 while being fitted to the stopper 19 while being wrapped and fixed to the valve housing 11. Are combined.

At this time, the coil spring 21 is inserted into the outer circumferential surface of the sleeve 18, one end of which is in the stepped jaw portion of the sleeve 18, the other end of the sleeve of the valve housing 11 forming the control valve unit 10 It is elastically supported using the coupling end 11b portion.

When the sleeve assembly 17 constituting the mechanical BAS provided in the control valve unit 10 constituting the brake booster is operated by rapid braking, as shown in FIG. 3 (a), the operating rod ( The forward movement of 1) causes the actuating plunger 12 to be advanced, and the advancing of the actuating plunger 12 has a stopper position end 12b having a conical shape at the distal end of the actuating plunger 12. Is pushed up.

That is, the stopper 19 is inserted into the stopper insertion groove 18a opened in the T-shape of the sleeve 18 as shown in FIG. 3 (b), and the stopper position end 12b of the operation plunger 12 is provided. As the stopper 19 is pushed up, the stopper 19 is pulled out from the stopper insertion groove 18a of the sleeve 18 as shown in FIG.

At this time, the stopper 19 is the spring engaging end (19b) is formed in the upper portion of the exit portion, while the lower portion of the plunger contact end (19c) forming the stopper insertion groove (18a) of the sleeve 18 is formed. It is located in the narrow part of the T shape.

As the stopper 19 is pulled out of the sleeve 18 as described above, the restraining force formed through the stopper 19 is released, so that the atmospheric pressure inflow space is formed in the control valve unit 10 while the retraction behavior of the sleeve 18 is achieved. It is formed, thereby supplying the atmospheric pressure introduced into the transformer chamber is divided into the diaphragm with respect to the negative pressure chamber (vacuum) of the chamber unit 30, the chamber unit 30 operates the master cylinder with the vacuum negative pressure formed To form a braking hydraulic pressure.

At this time, each of the springs and the like provided in the sleeve assembly 17 forming the BAS and the control valve unit 10 provides an elastic force to return to the initial state when the brake pedal operation is released.

The booster achieves a state in which an atmospheric pressure inflow space of the control valve unit 10 is secured through the BAS, and in the initial state in which the reaction piston 14 does not contact the control valve body, the jumping characteristic of the booster is increased. After the reaction piston 14 is in contact with the control valve body, it is possible to produce sufficient output of the booster without providing additional driver's effort.

As described above, according to the present invention, a mechanical BAS (Brake Assist System) of the booster which receives the forward movement force of the operating rod according to the rapid braking of the input speed due to the driver's effort is moved forward through the operating rod and the same. As the air inflow space is formed by using the relative speed and relative distance difference between the combined control valves, the operation due to the rapid braking is performed quickly and fast and sufficient air inflow to the transformer chamber side of the chamber unit enables rapid emergency power operation. It will work.

Claims (3)

An operating plunger 12 interlocked with the operating rod 1 that is axially moved during operation of the brake pedal is located in the inner space of the valve housing 11 forming the overall shape, and is operated as a tip portion of the valve housing 11. A control valve unit 10 in which the reaction disk 13 and the reaction piston 14 pressurized by the plunger 12 are sequentially positioned; One end is pressed against the operating rod 1 and the opposite side forms an extension bar position end 12a in a stepped shape on an axis formed with a small diameter so as to press the reaction disc 13 side, and the extension bar position end 12a. The tip portion forming the () is an actuating plunger (12) forming a stopper position end (12b) inclined to form a cone shape; The chamber unit introduces atmospheric pressure into the negative pressure chamber (vacuum) and the transformer chamber (atmospheric pressure) in which the inside thereof is partitioned through the diaphragm according to the operation of the control valve unit 10 to form a vacuum negative pressure for operating the master cylinder. 30 and; A sleeve 18 formed with a stopper insertion groove 18a which is coupled outwardly of the sleeve engaging end 11b of the valve housing 11 and is elastically supported by the spring 21 and opened in a T-shape at one end thereof, and an actuating plunger Pressing the stopper 19 and the stopper 19 toward the actuating plunger 12, which are lifted / lowered from the sleeve 18 in accordance with the linear movement direction of the 12 to enable the retraction / forward movement of the sleeve 18. A sleeve assembly 17 made of a stopper spring 20 that exerts an elastic force so as to be effective; Vacuum brake booster with mechanical emergency braking assistance. The stopper insert groove (18a) of claim 1, wherein the sleeve (18) has a hollow tubular shape so as to fit outside the sleeve engaging end (11b) of the valve housing (11) forming the control valve unit (10). ) Is a vacuum brake booster having a mechanical emergency braking assistance device, characterized in that a portion formed in a narrow width at the head of the T is formed toward the reaction disk (13). The stopper 19 is a stopper body (19a) is inserted into the T-shaped stopper insertion groove (18a) formed in the sleeve 18 while forming a plate shape of a predetermined thickness, the stopper body ( A spring engaging end 19b is formed in the upper portion of the stopper 19 to which the stopper spring 20 for pressing the stopper 19 toward the operation plunger 12 is formed, and in the lower portion of the stopper body 19a. In addition to the width having a width smaller than the width of 19a), the end surface is characterized in that the semicircular plunger contact end 19c is formed in contact with the stopper position end 12b of the actuating plunger 12. A vacuum brake booster with a mechanical emergency braking aid.

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