CN107310541A - A kind of modified servo vacuum booster device - Google Patents

Abstract

The invention provides an improved servo vacuum booster device, the structure of which comprises: a vacuum pump 1, a vacuum gas storage tank 2, a vacuum booster 3, an electronically controlled three-position three-way valve 4, a vacuum pipeline 5, and a pipeline 6; The booster 3 includes a booster housing 31, a booster piston 32, a person stepping on the brake input rod 33, a push rod 34, and an air port 35; the structure of the electronically controlled three-position three-way valve 4 includes a vacuum port 41, an air port 42, and a rear Cavity 43, spool 44, motor 45. Compared with the existing electric control vacuum booster, the device has a simple structure, is easy to install and arrange, and has high safety and reliability.

Description

An improved servo vacuum booster device

technical field

The invention relates to a vacuum booster braking device in an automobile braking system, in particular to an improved servo vacuum booster device.

Background technique

The vacuum booster is generally installed between the brake pedal and the brake master cylinder. It uses vacuum (negative pressure) to increase the force exerted by the driver on the pedal, and pushes the piston rod of the brake master cylinder to achieve the purpose of braking. CN200810062331 discloses a controllable vacuum booster, but the internal structure of the booster is relatively complicated. CN201210210474 discloses an electronically controlled vacuum booster, which uses a vacuum solenoid valve and an air solenoid valve, and is directly installed on the vacuum booster. Most of the existing electronically controlled vacuum boosters have complicated structures, and the structures can be further simplified.

Contents of the invention

The purpose of the present invention is to provide a servo vacuum booster improved on the existing vacuum booster brake device, which is used to realize brake booster in the automobile brake system.

The object of the invention adopts following technical scheme to realize:

An improved servo vacuum booster device, the structure of which includes: a vacuum pump 1, a vacuum gas storage tank 2, a vacuum booster 3, an electronically controlled three-position three-way valve 4, a vacuum pipeline 5, and a pipeline 6; the vacuum booster 3 includes Booster housing 31, booster piston 32, human brake input rod 33, push rod 34, air port 35; electronically controlled three-position three-way valve 4 structure includes vacuum port 41, air port 42, rear cavity port 43, Spool 44, motor 45.

The vacuum pipeline 5 is respectively connected with the vacuum pump 1, the vacuum gas tank 2, the front cavity of the vacuum booster 3 and the vacuum port 42 of the electronically controlled three-position three-way valve 4; The rear cavity is connected to the rear cavity port 43 of the electronically controlled three-position three-way valve 4; the spool 44 of the electronically controlled three-position three-way valve 4 can move left and right when the motor 45 is running.

Further, when the motor 45 is not working, the vacuum port 41 is connected to the rear chamber port 43, the air port 42 is closed, and the air port 35 remains normally closed; position state, the vacuum port 41 is closed, the air port 42 is closed, and the pedal action makes the air port 35 open; when the person does not step on the electric control brake, the motor 45 works, the valve core 44 moves to close the vacuum port 41, and opens the air port 42. The air port 35 remains normally closed.

The present invention has following advantage and positive effect:

1. Compared with the existing electronically controlled vacuum booster, the structure is simple, the cost is lower, and the reliability is high;

2. The valve body of the electronically controlled three-position three-way valve is not directly installed on the vacuum booster, which is convenient for installation and arrangement;

3. Control the motor operation of the electronically controlled three-position three-way valve according to the vehicle speed and vehicle distance information, which can actively brake and enhance the safety of the vehicle.

Description of drawings

The accompanying drawings constituting a part of this application are used to provide further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute an improper limitation of the present invention. In the attached picture:

Figure 1 Working Principle Diagram of Servo Vacuum Booster

Figure 2 Structural diagram of three-position three-way valve

Figure 3 Motor control strategy diagram

In the figure: vacuum pump (1), vacuum gas storage tank (2), vacuum booster (3), electronically controlled three-position three-way valve (4), vacuum pipeline (5), pipeline (6), booster housing (31), booster piston (32), people step on the brake input rod (33), push rod (34), air port (35), vacuum port (41), air port (42), rear cavity port (43 ), spool (44), motor (45).

detailed description

The present invention will be further described below in conjunction with the accompanying drawings and embodiments, but it should not be understood that the scope of the subject matter of the present invention is limited to the following embodiments. Without departing from the above-mentioned technical ideas of the present invention, various replacements and changes made according to common technical knowledge and conventional means in this field shall be included in the protection scope of the present invention.

An improved servo vacuum booster device, the structure of which includes: a vacuum pump 1, a vacuum gas storage tank 2, a vacuum booster 3, an electronically controlled three-position three-way valve 4, a vacuum pipeline 5, and a pipeline 6; the vacuum booster 3 includes Booster housing 31, booster piston 32, human brake input rod 33, push rod 34, air port 35; electronically controlled three-position three-way valve 4 structure includes vacuum port 41, air port 42, rear cavity port 43, Spool 44, motor 45.

The vacuum pipeline 5 is respectively connected with the vacuum pump 1, the vacuum gas tank 2, the front cavity of the vacuum booster 3 and the vacuum port 42 of the electronically controlled three-position three-way valve 4; The rear cavity is connected to the rear cavity port 43 of the electronically controlled three-position three-way valve 4; the spool 44 of the electronically controlled three-position three-way valve 4 can move left and right when the motor 45 is running.

Further, when the motor 45 is not working, the vacuum port 41 is connected to the rear chamber port 43, the air port 42 is closed, and the air port 35 remains normally closed; position state, the vacuum port 41 is closed, the air port 42 is closed, and the pedal action makes the air port 35 open; when the person does not step on the electric control brake, the motor 45 works, the valve core 44 moves to close the vacuum port 41, and opens the air port 42. The air port 35 remains normally closed.

Further, under the normal driving state of the automobile, the motor 45 is not working, the vacuum port 41 is connected with the rear chamber port 43, the air port 42 is closed, and the vacuum pump works to keep the front and rear chambers connected to be vacuum.

Further, when the driver steps on the brake pedal, the motor 45 works, so that the valve core 44 is in the neutral state, the vacuum port 41 is closed, the air port 42 is closed, the pedal action makes the air port 35 open, and the air enters the vacuum booster through the air port 35 3's rear chamber, there is a pressure difference between the front and rear chambers to achieve braking;

Further, when the driver does not step on the pedal and needs electric control, the motor 45 works, the valve core 44 moves to close the vacuum port 41, open the air port 42, keep the air port 35 normally closed, and the air enters the vacuum booster through the air port 42 In the rear chamber of the device 3, a pressure difference occurs between the front and rear chambers to achieve braking.

Further, the operation of the motor 45 can be determined according to the pedal stroke information and vehicle dynamic information, and a corresponding control strategy for the motor 45 is formulated as shown in FIG. Drive safely.

Claims (3)

1. An improved servo vacuum booster device, its structure includes: vacuum pump 1, vacuum gas storage tank 2, modified vacuum booster 3, electronically controlled three-position three-way valve 4, vacuum pipeline 5, pipeline 6; vacuum booster The device 3 includes a booster housing 31, a booster piston 32, a person stepping on the brake input rod 33, a push rod 34, and an air port 35; the structure of the electronically controlled three-position three-way valve 4 includes a vacuum port 41, an air port 42, and a rear cavity Port 43, spool 44, motor 45. 2. An improved servo vacuum booster device as claimed in claim 1, characterized in that: the vacuum pipeline 5 is connected to the front cavity of the vacuum pump 1, the vacuum gas storage tank 2, and the vacuum booster 3 and the electric control three-position three-position respectively. The vacuum port 42 of the through valve 4 is connected; the pipeline 6 is connected with the rear cavity of the vacuum booster 3 and the rear cavity port 43 of the electronically controlled three-position three-way valve 4 respectively; The spool 44 can move left and right. 3. An improved servo vacuum booster device as claimed in claim 1, characterized in that: when the motor 45 is not working, the vacuum port 41 is connected to the rear chamber port 43, the air port 42 is closed, and the air port 35 remains Normally closed; when a person steps on the pedal, the motor 45 works so that the valve core 44 is in the neutral state, the vacuum port 41 is closed, the air port 42 is closed, and the pedal action makes the air port 35 open; when the person does not step on the pedal, the electric control When moving, the motor 45 works, the valve core 44 moves to close the vacuum port 41, opens the air port 42, and the air port 35 remains normally closed.