CN206265016U - A kind of fail safe decoupling type arrestment mechanism - Google Patents

Abstract

The utility model discloses a kind of fail safe decoupling type arrestment mechanism；Including hydraulic tank, master cylinder, hydraulic regulating device, wheel cylinder, brake pedal, brake pushrod, transmission mechanism and external power source；External power source is used to provide rotating torque to transmission mechanism；Transmission mechanism includes turbine with the gear, tooth bar that are coaxial therewith installing and the decoupling sleeve being sleeved on outside tooth bar；The upper tooth meshing gear of tooth bar；The left end of tooth bar is provided with rack displacement sensor, for measuring tooth bar and decoupling the distance between sleeve lining, so as to will not be come in contact between brake pushrod and transmission mechanism during external power source normal work, so as to realize braking decoupling；Mechanism sets emergent fail-safe mechanism on the basis of mobile decoupling of the brake pedal with master cylinder is realized, while with preferably control flexibility, the effective safety and reliability for ensureing vehicle braking.

Description

A fail-safe decoupling braking mechanism

technical field

The utility model relates to an automobile decoupling braking device, in particular to a failure protection decoupling type braking mechanism.

Background technique

Traditional vacuum assisted braking and electric assisted braking systems use the pedal force and the boost of the power source as input forces to jointly push the brake master cylinder, and have not achieved decoupling of the brakes. This power assist system couples the pedal force to the brake master cylinder, which greatly increases the complexity of the mechanical structure. And this kind of system has a stricter control strategy for power assist. When the driver steps on the brake pedal by mistake, the pedal force will also be transmitted to the master cylinder, resulting in an obvious braking effect, but the driver has no intention of braking at this time.

Contents of the invention

The purpose of the utility model is to overcome the shortcomings and deficiencies of the above-mentioned prior art, and to provide a failure protection decoupling braking mechanism with simple structure and good braking effect; it has the advantages of safety, reliability, low noise, stable braking effect and Energy saving and other advantages.

The utility model is realized through the following technical solutions:

A fail-safe decoupling brake mechanism, including a hydraulic tank 9, a master cylinder 5, a hydraulic adjustment device 8 and a wheel cylinder 7; the two outlets of the hydraulic tank 9 are respectively connected to the two oil supply holes 56 of the master cylinder 5 , 57, the two drain holes 64, 65 of the master cylinder 5 are respectively connected to the wheel cylinder 7 through the hydraulic adjustment device 8; the failure protection decoupling brake mechanism also includes a brake pedal 1, a brake push rod 2 , transmission mechanism 3 and external power source 4;

The external power source 4 is used to provide rotational torque to the transmission mechanism 3, and the brake pedal 1 is movably connected to the brake push rod 2;

The transmission mechanism 3 includes a worm gear 38 and a gear 39 coaxially installed therewith, a rack 36 and a decoupling sleeve 31 sleeved on the outside of the rack 36; the upper teeth of the rack 36 mesh with the gear 39; The left end of 36 is equipped with a rack displacement sensor 361, which is used to measure the distance between the rack 36 and the inner wall of the decoupling sleeve 31, so that the distance between the brake push rod 2 and the transmission mechanism 3 when the external power source 4 works normally There will be no contact between them, thus achieving decoupling of the brake;

The left end of the decoupling sleeve 31 is connected to the brake push rod 2; the right end of the decoupling sleeve 31 is open, and the master cylinder push rod 37 of the master cylinder 5 passes through the opening to connect to the rack 36;

The brake pedal 1 also includes a return spring 22 for simulating the pedaling feeling when braking;

One side of the brake pedal 1 is provided with a pedal displacement sensor 11 for judging the total braking force demand.

Described external power source 4 comprises controller 42, motor 43 and the worm screw 41 of motor 43 power outputs; Described worm screw 41 engages worm gear 38, when worm screw 41 rotates, power is output to worm gear 38, makes worm gear 38 rotate; The device 42 controls the operation of the motor 43, and the pedal displacement sensor 11 and the rack displacement sensor 361 are connected to the controller 42 by telecommunication respectively; the controller 42 drives the motor 43 to rotate according to the displacement of the pedal displacement sensor 11, and the Torque is output to turbine 38 , causing turbine 38 to spin.

The specific installation position of the return spring 22 is sleeved on the master cylinder push rod 37, one end of which is offset against the outer wall of the decoupling sleeve 31, and the other end is offset against the transmission mechanism 3, and the return spring 22 is used to simulate the pedaling during braking. sense; when the brake pedal 1 is stepped on reciprocally, the brake push rod 2 can drive the decoupling sleeve 31 to reciprocate axially.

The specific installation position of the return spring 22 is sleeved on the brake push rod 2, one end of which is connected to the baffle plate 23 arranged in the middle of the brake push rod 2, and the other end is offset against the limit plate on the right side of the brake push rod 2 ; The baffle 23 is not in contact with or in sliding contact with the brake push rod 2; when the brake pedal 1 is reciprocated, the brake push rod 2 can drive the decoupling sleeve 31 to reciprocate axially.

The specific installation position of the return spring 22 is that one end is in contact with the inner wall of the decoupling sleeve 31, and the other end extends out of the right end opening of the decoupling sleeve 31, and is in contact with the master cylinder shell 51 of the master cylinder 5; When the pedal is 1, the brake push rod 2 can drive the decoupling sleeve 31 to reciprocate axially.

The worm gear 38 and the gear 39 installed coaxially with it rotate together and have the same rotation angle.

The master cylinder 5 also includes a first liquid supply chamber 52, a first brake chamber 54, a first piston 60, a second liquid supply chamber 53, a second brake chamber 55, a second Piston 61.

The left end of the brake push rod 2 is sheathed with a guide sleeve 21 for providing guidance.

Under normal circumstances, the brake pedal force of the utility model will not be transmitted to the master cylinder, and the output force of the external power source is used as the only power to push the master cylinder. It builds up brake pressure three times faster than conventional systems. Through brake decoupling, active braking can be realized, and with the relevant displacement sensors, additional functions such as automatic braking and automatic parking can be realized. By adjusting the output power of the external power source, a better brake pedal feeling can be achieved on various models. As a new generation of braking system, the decoupling braking system will have the advantages of the traditional braking system while overcoming many of the shortcomings of the traditional braking system. It has higher efficiency and faster response speed, and can realize active braking, etc. Additional features, but also higher reliability and security.

To sum up, the utility model has at least the following advantages: under normal conditions, there is no contact between the brake pedal and the master cylinder, so there is no force transmission and decoupling is realized.

The utility model adopts an external power source, and responds quickly. By adjusting the output force of the external power source, better brake pedal feel can be achieved on different vehicle types.

Through the decoupling between the brake pedal and the master cylinder, the utility model can realize active braking in emergency situations, and can also cooperate with sensors such as reversing radar to realize functions such as automatic parking.

The utility model adds a failure protection mechanism of an external power source. When the external power source fails, the driver continues to step on the brake pedal, and the brake push rod pushes the decoupling sleeve forward. When the decoupling sleeve continues to move to the left, it overcomes the gap between the rack and the gear rack. After the contact, the inner wall of the decoupling sleeve pushes the rack forward at this time, and the master cylinder pressure is established through the master cylinder push rod. Thus, the force of the brake pedal can still be transmitted via the transmission into the master cylinder.

The utility model has a simple structure and does not need to change the structure of the existing main cylinder.

The technical means of the utility model is simple and easy to implement, and has the advantages of low noise, stable braking effect, energy saving, quick response, safety and high efficiency.

Description of drawings

Fig. 1 is a schematic diagram of the principle of the fully decoupled braking system with fail-safe of the present invention.

Fig. 2 is a structural schematic diagram of a failure protection decoupling brake mechanism of the present invention.

Fig. 3 is a structural schematic diagram II of the failure protection decoupling brake mechanism of the present invention.

Fig. 4 is a structural schematic diagram III of the failure protection decoupling brake mechanism of the present invention.

Fig. 5 is a coordinate diagram of the pedal displacement sensor 11 and the displacement sensor 311 when decoupling in the control process of the present invention.

Fig. 6 is a coordinate diagram of the pedal displacement sensor 11 and the displacement sensor 311 when the external power source fails during the control process of the utility model.

detailed description

Below in conjunction with specific embodiment the utility model is described in further detail.

Example 1

As shown in Figures 1 to 6. The utility model discloses a failure protection decoupling type brake mechanism, which comprises a hydraulic tank 9, a main cylinder 5, a hydraulic adjustment device 8 and a wheel cylinder 7; the two outlets of the hydraulic tank 9 are respectively connected to the main cylinder 5 Two oil supply holes 56, 57, and two drain holes 64, 65 of the master cylinder 5 communicate with the wheel cylinder 7 through the hydraulic adjustment device 8 respectively; the fail-safe decoupling braking mechanism also includes a brake pedal 1, Brake push rod 2, transmission mechanism 3 and external power source 4;

The external power source 4 is used to provide rotational torque to the transmission mechanism 3, and the brake pedal 1 is movably connected to the brake push rod 2;

The transmission mechanism 3 includes a worm gear 38 and a gear 39 coaxially installed therewith, a rack 36 and a decoupling sleeve 31 sleeved on the outside of the rack 36; the upper teeth of the rack 36 mesh with the gear 39; The left end of 36 is equipped with a rack displacement sensor 361, which is used to measure the distance between the rack 36 and the inner wall of the decoupling sleeve 31, so that the distance between the brake push rod 2 and the transmission mechanism 3 when the external power source 4 works normally There will be no contact between them, thus achieving decoupling of the brake;

The left end of the decoupling sleeve 31 is connected to the brake push rod 2; the right end of the decoupling sleeve 31 is open, and the master cylinder push rod 37 of the master cylinder 5 passes through the opening to connect to the rack 36;

The brake pedal 1 also includes a return spring 22 for simulating the pedaling feeling when braking;

One side of the brake pedal 1 is provided with a pedal displacement sensor 11 for judging the total braking force demand.

Described external power source 4 comprises controller 42, motor 43 and the worm screw 41 of motor 43 power outputs; Described worm screw 41 engages worm gear 38, when worm screw 41 rotates, power is output to worm gear 38, makes worm gear 38 rotate; The device 42 controls the operation of the motor 43, and the pedal displacement sensor 11 and the rack displacement sensor 361 are connected to the controller 42 by telecommunication respectively; the controller 42 drives the motor 43 to rotate according to the displacement of the pedal displacement sensor 11, and the Torque is output to turbine 38 , causing turbine 38 to spin.

The specific installation position of the return spring 22 is sleeved on the master cylinder push rod 37, one end of which is offset against the outer wall of the decoupling sleeve 31, and the other end is offset against the transmission mechanism 3, and the return spring 22 is used to simulate the pedaling during braking. sense; when the brake pedal 1 is stepped on reciprocally, the brake push rod 2 can drive the decoupling sleeve 31 to reciprocate axially.

The worm gear 38 and the gear 39 installed coaxially with it rotate together and have the same rotation angle.

The master cylinder 5 also includes a first liquid supply chamber 52, a first brake chamber 54, a first piston 60, a second liquid supply chamber 53, a second brake chamber 55, a second Piston 61.

The left end of the brake push rod 2 is sheathed with a guide sleeve 21 for providing guidance.

The working principle of the present utility model is as follows: according to the pedal displacement sensor 11 and the displacement sensor 361, control is applied to the external power source 4; The magnitude of the output force makes the value of the displacement sensor 361 always greater than the value of the pedal displacement sensor 11, that is, the brake push rod 2 and the transmission mechanism 3 maintain a certain gap, the brake pedal force will not be transmitted to the master cylinder 5, and the brake decoupling is realized Increase the output force of the external power source 4 so that when the slope of the curve of the displacement sensor 361 is greater than the slope of the curve of the pedal displacement sensor 11, a smaller pedal force can obtain a larger pressure of the master cylinder 5 to achieve braking comfort; Reduce the output force of the external power source 4 so that when the slope of the curve of the displacement sensor 361 is smaller than the slope of the curve of the pedal displacement sensor 11, a larger pedal force is required to obtain the same master cylinder pressure and achieve a "hard" brake pedal feel ; 2) When the external power source 4 fails due to a fault, when the driver steps on the brake pedal, the brake push rod moves in the direction of the transmission mechanism 3, while the transmission mechanism 3 does not move; When there is a gap between the barrels 31, the brake push rod 2 pushes the rack 36 forward through the decoupling sleeve 31, and then pushes the transmission mechanism 3 to move together to build up the master cylinder pressure.

The decoupling method of the failure protection decoupling brake mechanism of the utility model can be realized through the following steps:

Steps when the external power source 4 works normally:

Step on the brake pedal 1, the brake push rod 2 pushes the decoupling sleeve 31 forward, and the return spring 22 between the decoupling sleeve 31 and the master cylinder shell 51 produces a reaction force on the decoupling sleeve 31, which is used to simulate braking. The pedaling feeling when moving; the controller 42 draws the power requirement that the external power source 4 should produce according to the pedal displacement sensor 11 and drives the worm screw 41. After the turbine 38 and the gear 39 decelerate and increase the torque, the power is transmitted to the rack 36. The torque is converted into the axial movement force of the rack 36 and pushes the master cylinder push rod 37;

The master cylinder push rod 37 pushes the first piston 60 and the second piston 61, thereby compressing the first liquid supply chamber 52 and the second liquid supply chamber 53 to establish the master cylinder pressure;

The high-pressure oil in the hydraulic tank 9 flows into the wheel cylinder 7 through the two drain holes 64 and 65 through the hydraulic adjustment device 8 for braking;

Because there is a gap between the decoupling sleeve 31 and the rack 36, the external power source 4 drives the rack 36 to move together, so that the force of the brake pedal 1 will not be transmitted to the rack 36, thereby realizing the brake pedal 1 and the rack 36. Complete decoupling between master cylinders 5.

In addition, according to the requirements of relevant regulations, the braking system must also allow the force of the driver to step on the brake pedal to be transmitted to the braking system for braking in consideration of the occurrence of failure and the failure of certain components. Therefore, when the external power source 4 fails to generate torque to drive the worm 41, the worm gear 38, the gear 39 and the rack 36 due to failure; the driver continues to step on the brake pedal 1, and the brake push rod 2 pushes the decoupling sleeve 31 Forward, when the decoupling sleeve 31 continues to move to the right and overcomes the gap between the rack 36 and contacts it, the inner wall of the decoupling sleeve 31 pushes the rack 36 forward, and passes through the master cylinder push rod 37 Build master cylinder pressure.

Example 2

This embodiment is the same as Embodiment 1 except for the following features.

The specific installation position of the return spring 22 is sleeved on the brake push rod 2, one end of which is connected to the baffle plate 23 arranged in the middle of the brake push rod 2, and the other end is offset against the limit plate on the right side of the brake push rod 2 ; The baffle 23 is not in contact with or in sliding contact with the brake push rod 2; when the brake pedal 1 is reciprocated, the brake push rod 2 can drive the decoupling sleeve 31 to reciprocate axially.

Example 3

This embodiment is the same as Embodiment 1 except for the following features.

The specific installation position of the return spring 22 is that one end is in contact with the inner wall of the decoupling sleeve 31, and the other end extends out of the right end opening of the decoupling sleeve 31, and is in contact with the master cylinder shell 51 of the master cylinder 5; When the pedal is 1, the brake push rod 2 can drive the decoupling sleeve 31 to reciprocate axially.

As mentioned above, the utility model can be better realized.

The implementation of the present utility model is not limited by the above-mentioned examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present utility model should be equivalent replacement methods. Included within the protection scope of the present utility model.

Claims (8)

1. A failure protection decoupling type braking mechanism, comprising a hydraulic tank (9), a master cylinder (5), a hydraulic adjustment device (8) and a wheel cylinder (7); the two outlets of the hydraulic tank (9) are respectively The pipeline is connected to the two oil supply holes (56, 57) of the master cylinder (5), and the two drain holes (64, 65) of the master cylinder (5) are respectively connected to the wheel cylinder (7) through the hydraulic adjustment device (8). ; characterized by: The fail-safe decoupling brake mechanism also includes a brake pedal (1), a brake push rod (2), a transmission mechanism (3) and an external power source (4); The external power source (4) is used to provide the transmission mechanism (3) with rotational torque, and the brake pedal (1) is movably connected to the brake push rod (2); The transmission mechanism (3) includes a worm gear (38) and a gear (39) coaxially installed therewith, a rack (36) and a decoupling sleeve (31) sleeved on the outside of the rack (36); the rack The upper tooth of (36) meshes with the gear (39); the left end of the rack (36) is equipped with a rack displacement sensor (361), which is used to measure the distance between the rack (36) and the inner wall of the decoupling sleeve (31). The distance between the brake push rod (2) and the transmission mechanism (3) will not be in contact when the external power source (4) works normally, so as to realize the decoupling of the brake; The left end of the decoupling sleeve (31) is connected to the brake push rod (2); the right end of the decoupling sleeve (31) is open, and the master cylinder push rod (37) of the master cylinder (5) passes through the opening connecting rack (36); The brake pedal (1) also includes a return spring (22) for simulating the pedaling feeling when braking; One side of the brake pedal (1) is provided with a pedal displacement sensor (11) for judging the total braking force demand. 2. The fail-safe decoupling braking mechanism according to claim 1, characterized in that: the external power source (4) includes a controller (42), a motor (43) and a worm for power output of the motor (43) (41); the worm (41) engages the turbine (38), and when the worm (41) rotates, the power is output to the turbine (38), so that the turbine (38) rotates; the controller (42) controls the motor (43) The operation of the pedal displacement sensor (11) and the rack displacement sensor (361) are respectively connected to the controller (42) by telecommunications; the controller (42) drives the motor (43) according to the displacement of the pedal displacement sensor (11) Rotate, and output the torque to the turbine (38) through the worm (41), so that the turbine (38) rotates. 3. The fail-safe decoupling brake mechanism according to claim 2, characterized in that, the specific installation position of the return spring (22) is sleeved on the master cylinder push rod (37), and one end of it is connected to the decoupling sleeve The outer wall of the barrel (31) is offset, and the other end is offset against the transmission mechanism (3), and the return spring (22) is used to simulate the pedaling feeling when braking; when the brake pedal (1) is stepped on reciprocally, the brake push rod (2 ) can drive the decoupling sleeve (31) to reciprocate axially. 4. The fail-safe decoupling brake mechanism according to claim 2, characterized in that, the specific installation position of the return spring (22) is sleeved on the brake push rod (2), and one end thereof is connected to the brake push rod (2). The baffle plate 23 in the middle part of the moving push rod (2) is connected, and the other end resists with the limit plate on the right side of the brake push rod (2); the baffle plate 23 does not contact or slides with the brake push rod (2); When the brake pedal (1) is applied, the brake push rod (2) can drive the decoupling sleeve (31) to reciprocate axially. 5. The fail-safe decoupling brake mechanism according to claim 2, characterized in that, the specific installation position of the return spring (22) is that one end of the return spring (22) is against the inner wall of the decoupling sleeve (31), and the other end extends out of the decoupling sleeve (31). The right end of the coupling sleeve (31) is open and offset against the master cylinder housing (51) of the master cylinder (5); when the brake pedal (1) is reciprocally stepped on, the brake push rod (2) can drive the decoupling sleeve (31) Axial reciprocating motion. 6. The fail-safe decoupling braking mechanism according to any one of claims 1 to 5, characterized in that: the turbine (38) and the gear (39) installed coaxially with it rotate together and have the same rotation angle . 7. The fail-safe decoupling brake mechanism according to claim 6, characterized in that: the master cylinder (5) further comprises a first liquid supply chamber (52), a second A brake chamber (54), a first piston (60), a second liquid supply chamber (53), a second brake chamber (55), and a second piston (61). 8. The fail-safe decoupling brake mechanism according to claim 6, characterized in that: the left end of the brake push rod (2) is sleeved with a guide sleeve (21) for providing a guide function for it.