CN111994061A

CN111994061A - Brake booster unit that can be used to auxiliary brake

Info

Publication number: CN111994061A
Application number: CN202010943076.3A
Authority: CN
Inventors: 任书胜
Original assignee: Shandong Sinochem Hengxin Automobile Technology Co ltd
Current assignee: Shandong Sinochem Hengxin Automobile Technology Co ltd
Priority date: 2020-09-09
Filing date: 2020-09-09
Publication date: 2020-11-27

Abstract

The invention provides a brake booster unit for auxiliary braking, which comprises a control system, a brake assembly and a vacuum booster, wherein a booster component is arranged between the brake assembly and the vacuum booster, and the booster component comprises: the input shaft is connected with the brake assembly; the output shaft is internally provided with a sliding hole, the input shaft is arranged in the sliding hole in a sliding way, and the output shaft is provided with a rack; the spring is arranged in the sliding hole of the output shaft; the gear is meshed with the rack on the output shaft and is connected with the power-assisted motor; the operating rod is connected with the output shaft and the vacuum booster; the displacement sensor is used for detecting the relative positions of the output shaft and the input shaft; and the displacement sensor and the power-assisted motor are in electric signal connection with the control system. This device structural design is simple reasonable, and the integrated level is high, can realize the brake helping hand, can combine to realize automatic brake with the autopilot technique simultaneously.

Description

Brake booster unit that can be used to auxiliary brake

Technical Field

The invention mainly relates to the technical field of new energy automobile braking, in particular to a brake booster device capable of being used for auxiliary braking.

Background

In the conventional automobile braking technology, a vacuum booster is required to assist braking. For a traditional automobile using an engine, the engine is used for sucking vacuum to assist. For a new energy automobile, a vacuum pump is generally added to a brake system to perform vacuum pumping because an engine is not used. In the braking system of this structure, vacuum booster can only provide the helping hand when the footboard is stepped on, and vacuum booster can't move when not stepping on the footboard and realize the helping hand brake. With the development of the automatic driving technology, the automatic braking technology is indispensable, and the traditional braking system needs to add an additional automatic braking structure to meet the use requirement, which undoubtedly increases the cost of the automobile and the complexity of the structure, so a comprehensive power assisting device is designed, which can meet the power assisting requirement during the pedal braking and can be combined with the automatic driving technology to realize the automatic braking when necessary, and the technical problem that the technical personnel in the field need to solve urgently is solved.

Disclosure of Invention

In order to solve the defects of the prior art, the invention provides a brake booster device for auxiliary braking by combining the prior art and starting from practical application.

The technical scheme of the invention is as follows:

a brake booster device that can be used to auxiliary brake, includes control system, brake assembly and vacuum booster, set up helping hand subassembly between brake assembly and the vacuum booster, helping hand subassembly includes:

the input shaft is connected with the brake assembly and is used for realizing linear motion when the brake assembly acts;

the output shaft is internally provided with a sliding hole, the input shaft is arranged in the sliding hole in a sliding way, and the output shaft is provided with a rack;

the spring is arranged in the sliding hole of the output shaft and applies force to the input shaft towards the direction of the input shaft;

the gear is meshed and matched with the rack on the output shaft and is connected with the power-assisted motor and used for driving the output shaft to linearly move when the motor rotates;

the operating rod is connected with the output shaft and the vacuum booster and is used for driving the vacuum booster to act when the output shaft moves;

a displacement sensor for detecting the relative position of the output shaft and the input shaft;

and the displacement sensor and the power-assisted motor are in electric signal connection with the control system.

Preferably, the rack is formed on a circumferential surface of the output shaft and is integrally formed with the output shaft, and the operating lever is provided on an end surface of the input shaft.

Preferably, the sliding hole is a blind hole machined in the output shaft, one end of the input shaft is slidably inserted into the blind hole, one end of the spring abuts against the end face of the blind hole, and the other end of the spring abuts against the end face of the input shaft.

Preferably, the gear comprises a gear body, a first connecting portion and a second connecting portion, the first connecting portion and the second connecting portion are respectively arranged on the end faces of two sides of the gear body, and the first connecting portion is connected with the power-assisted motor.

Preferably, the first connecting part is connected with the power-assisted motor through a coupling.

Preferably, the first connecting portion and the second connecting portion are both provided with bearing supports.

Preferably, at least one displacement sensor is arranged;

at least one displacement sensor is disposed in a sliding hole of the input shaft end or the output shaft.

Preferably, the boosting assembly further comprises a shell, and the shell is fixedly connected with the brake assembly and the vacuum booster;

the power-assisted motor is fixed outside the shell, the input shaft, the output shaft and the gear are all arranged in the shell, and a slide way for the output shaft to slide is arranged in the shell.

The invention has the beneficial effects that:

1. according to the power assisting device designed by the invention, when the brake assembly acts, the input shaft can push the output shaft to act, and then the output shaft can drive the operating rod to act, so that the action of the vacuum booster is triggered, and the brake is realized; meanwhile, the force at the pedal can be calculated through the relative displacement of the input shaft and the output shaft measured by the displacement sensor, when the force applied by the brake assembly is detected to reach a certain value, the control system controls the power-assisted motor to act, and then the power-assisted motor can drive the output shaft to act so as to realize the power assistance on the brake assembly; meanwhile, the control system is adopted to realize the action of the power-assisted motor, and in the automatic driving technology, the control system can directly send instructions to the power-assisted motor under the condition of not treading a pedal to realize automatic braking.

2. The power assisting device is simple and reasonable in structural design, small and compact in overall structural scheme design, high in structural stability, high in control precision and low in failure rate, and the force transmission is realized through the input shaft and the output shaft which are sleeved together.

Drawings

FIG. 1 is a schematic diagram of the overall structure of the present invention;

FIG. 2 is a schematic view of a booster assembly according to the present invention;

FIG. 3 is a schematic view of the housing structure of the present invention;

FIG. 4 is a schematic structural view of the power assisting assembly with the housing removed;

FIG. 5 is a schematic structural view of an input shaft and an output shaft of the present invention;

FIG. 6 is a schematic sectional view of the input shaft and the output shaft of the present invention;

fig. 7 is a schematic view of the gear structure of the present invention.

Reference numerals shown in the drawings:

1. a vacuum booster; 2. a brake assembly; 3. a boost assembly; 31. a booster motor; 32. a housing; 321. a slideway; 33. an input shaft; 34. an output shaft; 341. a rack; 342. an operating lever; 343. a slide hole; 35. a gear; 351. a gear body; 352. a first connection portion; 353. a second connecting portion; 36. a bearing; 37. a displacement sensor; 38. a spring.

Detailed Description

The invention is further described with reference to the accompanying drawings and specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and these equivalents also fall within the scope of the present application.

As shown in fig. 1 to 7, a brake boosting device for assisting braking according to an embodiment of the present invention is provided.

The booster mainly comprises a control system, a brake assembly 2 and a vacuum booster 1, wherein a booster component 3 is arranged between the brake assembly 2 and the vacuum booster 1, in the booster, the brake assembly 2 is an assembly integrated with a pedal, and when the brake assembly 2 acts, the booster component 3 is transmitted to the vacuum booster 1, so that the vacuum booster 1 acts to brake.

The boosting assembly 3 of the present embodiment mainly includes:

one end of the input shaft 33 is connected with the brake assembly 1, and when the brake assembly 1 acts, the input shaft 33 can be driven to do linear motion;

an output shaft 34, wherein a sliding hole 343 is provided in the output shaft 34, one end of the input shaft 33 is inserted into the sliding hole 343 and can slide in the sliding hole 343, and a rack 341 is provided on the output shaft 34;

a spring 38, the spring 38 being disposed in the slide hole 343 of the output shaft 34, the spring 38 urging the input shaft 33 in the direction of the input shaft 33;

the gear 35 is meshed with the rack 341 on the output shaft 34, the gear 35 is connected with the power-assisted motor 31, when the power-assisted motor 31 rotates, the gear 35 is driven to rotate, and the gear 35 further drives the output shaft 34 to do linear motion;

one end of the operating rod 342 is connected with the output shaft 34, the other end of the operating rod 342 is connected with the vacuum booster 1, and when the output shaft 34 acts, the operating rod 342 is driven to act, so that the operating rod 342 triggers the vacuum booster 1 to act, and braking is realized;

a displacement sensor 37, the displacement sensor 37 being positionable to detect the relative position of the output shaft 34 and the input shaft 33; from this position, the amount of compression of the spring 38 can be calculated, and the magnitude of pedal application force at the brake assembly 2 can be obtained.

In this embodiment, the displacement sensor 37 and the booster motor 31 are both electrically connected to the control system. The control system analyzes the data measured by the displacement sensor 37 and sends a control signal to the assist motor 31 to actuate the assist motor 31 to achieve the assist of braking.

When the brake booster device of the embodiment is used as a brake booster, after a driver steps on a pedal of the brake assembly 2, the input shaft 33 moves inside the output shaft 34, so that the spring 38 is compressed, the spring 38 applies force to the output shaft 34 to enable the output shaft 34 to act, the output shaft 34 enables the operating rod 34 to act, and the vacuum booster 1 is triggered to act to realize braking; meanwhile, when the data measured by the displacement sensor 37 exceeds the set threshold, it indicates that the force applied to the pedal exceeds the set threshold and exceeds the bearing range of the driver, and at this time, the assist system operates, that is, the control system sends a signal to the assist motor 31 to start the assist motor 31, and the assist motor 31 drives the output shaft 34 to operate through the gear 35 to realize the assist. The control system can thus control the servomotor 31 in real time on the basis of the data detected by the displacement sensor 37, and the displacement sensor 37 can simultaneously measure the pedal travel in order to optimize the control system.

When the brake assisting device is combined with an automatic driving technology, when the control system detects that braking is needed, a signal can be directly sent to the assisting motor 31 to enable the assisting motor 31 to start to realize braking, and at the moment, pedal triggering is not needed. Therefore, the device can realize the assistance during the pedal braking on the one hand, and on the other hand can be directly applied to the automatic braking technology, so that the system integration level is high, and the practicability is strong.

In this embodiment, specifically, the rack 341 may be directly formed on the circumferential surface of the output shaft 34 and integrally formed with the output shaft 34, and the operating lever 342 may be provided on the end surface of the input shaft 33. The slide hole 343 is a blind hole formed in the output shaft 34, into which one end of the input shaft 33 is slidably inserted, and the spring 38 is pressed against the end face of the blind hole at one end and against the end face of the input shaft 33 at the other end. The input shaft 33, the output shaft 34, the operating rod 342 and the sliding hole 343 are coaxially arranged, so that flexible movement of each part and stable force transmission are ensured.

Preferably, in the present embodiment, the gear 35 includes a gear body 351, a first connecting portion 352 and a second connecting portion 353, the first connecting portion 352 and the second connecting portion 353 are respectively provided on end surfaces of both sides of the gear body 351, and the first connecting portion 352 and the power-assisted motor 31 are connected by a coupling. Bearings 36 may be provided on both the first connection portion 352 and the second connection portion 353 to support the rotation of the rotating member.

In this embodiment, at least one displacement sensor 37 is provided, and at least one displacement sensor 37 is provided in the end portion of the input shaft 33 or the slide hole 343 of the output shaft 34. The displacement sensors 37 may be specifically selected in number and position depending on the type of sensor, so as to be able to accurately measure the relative displacement between the input shaft 33 and the output shaft 34.

Preferably, in the embodiment, the boosting assembly 3 further includes a housing 32, and the housing 32 is fixedly connected with the brake assembly 2 and the vacuum booster 1; the assist motor 31 is fixed outside the housing 32, the input shaft 33, the output shaft 34, and the gear 35 are all provided in the housing 32, and a slide 321 for sliding the output shaft 34 is provided in the housing 32. The power assisting assembly 3 can be integrated on the shell 32 through the designed shell 32, the structure is compact, the installation is convenient, and the design of the slide rail 321 can realize the guiding motion of the output shaft 34 so as to ensure the stability of the device in use.

Claims

1. A brake booster usable for assisting braking, comprising a control system, a brake assembly (2) and a vacuum booster (1), characterized in that a booster component (3) is provided between the brake assembly (2) and the vacuum booster (1), the booster component (3) comprising:

the input shaft (33), the said input shaft (33) connects the brake assembly (1), is used for realizing the linear motion when the brake assembly (2) acts;

the output shaft (34), set up the slide hole (343) in the said output shaft (34), the input shaft (33) is slidably set up in the said slide hole (343), there are racks (341) on the output shaft (34);

a spring (38), wherein the spring (38) is arranged in a sliding hole (343) of the output shaft (34), and the spring (38) biases the input shaft (33) towards the input shaft (33);

the gear (35) is meshed and matched with the rack (341) on the output shaft (34), and the gear (35) is connected with the power-assisted motor (31) and is used for driving the output shaft (34) to do linear motion when the power-assisted motor (31) rotates;

the operating rod (342), the operating rod (342) is connected with the output shaft (34) and the vacuum booster (1) and is used for driving the vacuum booster (1) to act when the output shaft (34) moves;

a displacement sensor (37), the displacement sensor (37) being configured to detect a relative position of the output shaft (34) and the input shaft (33);

and the displacement sensor (37) and the power-assisted motor (31) are in electric signal connection with the control system.

2. The brake servo unit usable for an auxiliary brake of claim 1, wherein the rack gear (341) is formed on a circumferential surface of the output shaft (34) to be integrally formed with the output shaft (34), and the operating lever (342) is provided on an end surface of the input shaft (33).

3. The brake servo unit according to claim 1, wherein the sliding hole (343) is a blind hole formed in the output shaft (34), the input shaft (33) is slidably inserted into the blind hole at one end, and the spring (38) abuts against the blind hole at one end and the input shaft (33) at the other end.

4. The brake servo device for assisting braking according to claim 1, wherein the gear (35) includes a gear body (351), a first connecting portion (352) and a second connecting portion (353), the first connecting portion (352) and the second connecting portion (353) are respectively provided on end surfaces of both sides of the gear body (351), and the first connecting portion (352) is connected to the servo motor (31).

5. Brake servo unit usable for assisted braking according to claim 4, characterized in that the first connection (352) is coupled to the servo motor (31) by means of a coupling.

6. The brake servo unit for assisting braking according to claim 4, wherein the first connecting portion (352) and the second connecting portion (353) are supported by bearings (36).

7. Brake booster usable for auxiliary braking according to claim 1, characterized in that at least one of the displacement sensors (37) is provided;

at least one displacement sensor (37) is arranged in a sliding hole (343) of the end of the input shaft (33) or the output shaft (34).

8. The brake servo system for assisting braking according to claim 1, wherein the servo assembly (3) further comprises a housing (32), the housing (32) is fixedly connected with the brake assembly (2) and the vacuum booster (1);

the power-assisted motor (31) is fixed outside the shell (32), the input shaft (33), the output shaft (34) and the gear (35) are all arranged in the shell (32), and a slide way (321) for the output shaft (34) to slide is arranged in the shell (32).