A braking system

Abstract

The present invention relates to the technical field of automobile braking, and in particular to a braking system, which includes a housing, the housing is provided with a first sliding cavity, and one side of the first sliding cavity has a first opening; a piston device is slidably arranged in the first sliding cavity, and the piston device can slide along the first sliding cavity under the drive of the brake pedal, the piston device divides the first sliding cavity into an outer cavity with a variable volume and a load cavity, the first opening is arranged in the outer cavity, and hydraulic oil is injected into the load cavity; a braking device includes a booster assembly and a brake cylinder, the brake piston of the brake cylinder brakes the vehicle by moving, and the booster assembly can push the brake piston to move; a first valve assembly can make the load cavity selectively connected to the piston cavity and oil storage tank of the brake cylinder. The present invention can produce a sense of hysteresis and ensure the efficiency of emergency braking in the case of power failure.

Description

Technical Field

[0001] The invention relates to the technical field of automobile braking, and in particular to a braking system. Background Art

[0002] The hydraulic brake system is an important component in motor vehicles such as automobiles. Users brake through structures such as foot pedals.

[0003] Electronic brake products are mostly used in existing motor vehicles. In order to avoid the reaction force generated by pure mechanical contact in the brake structure from hurting the user's feet or causing a bad feeling, electronic brake products are equipped with pedal simulators. Existing pedal simulators are usually pure spring structures, which use the elastic force of the spring to give the user a sense of damping and hysteresis.

[0004] However, a pure spring structure cannot accurately control the pedal feel curve, and a pure spring simulated structure has almost no lag. It is very strenuous and difficult for users to step on the brake pedal. When the power assist fails, the spring simulation structure will greatly reduce the driver's force on the brake device. The driver needs to overcome the spring force to apply pressure to the brake device, and emergency braking is slower.

[0005] Therefore, a braking system is needed to solve the above technical problems. Summary of the invention

[0006] The object of the present invention is to provide a braking system which can generate a hysteresis feeling and ensure emergency braking efficiency in the case of power assist failure.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] A braking system, comprising:

[0009] A housing, wherein the housing is provided with a first sliding cavity, and one side of the first sliding cavity has a first opening;

[0010] a piston device, slidably disposed in the first sliding chamber, and the piston device can slide along the first sliding chamber under the drive of the brake pedal, the piston device divides the first sliding chamber into an outer chamber with a variable volume and a load chamber, the first opening is disposed in the outer chamber, and hydraulic oil is injected into the load chamber;

[0011] The brake device comprises a power-assist assembly and a brake oil cylinder, wherein the brake piston of the brake oil cylinder brakes the vehicle by moving, the power-assist assembly can push the brake piston to move, and the distance that the power-assist assembly pushes the brake piston to move is positively correlated with the distance that the brake pedal drives the piston device to move;

[0012] The first valve assembly enables the load chamber to selectively communicate with the piston chamber of the brake oil cylinder and the oil storage tank.

[0013] Furthermore, the piston device comprises:

[0014] A first piston assembly, one end of which extends out relative to the first opening and is connected to the brake pedal, and the first piston assembly is slidably disposed in the first sliding cavity;

[0015] The second piston assembly is slidably disposed in the first sliding cavity, and one end of the second piston assembly that is away from the load cavity is connected to the first piston assembly.

[0016] Furthermore, the first piston assembly includes a pedal connector, a push rod and a first piston, one end of the pedal connector is connected to the brake pedal, and the other end is connected to the push rod, the push rod is connected to the first piston, and the first piston can slide along the first sliding cavity under the push of the push rod.

[0017] Furthermore, the portion of the first sliding chamber located between the first piston assembly and the second piston assembly is a push rod chamber, the push rod chamber is filled with hydraulic oil, and the push rod chamber is selectively connected to the piston chamber of the brake cylinder and the oil storage tank through a second valve assembly.

[0018] Furthermore, the second piston assembly includes an elastic assembly and a second piston, one end of the elastic assembly is connected to the first piston, and the other end is connected to the second piston, and the second piston is slidably disposed in the first sliding cavity.

[0019] Furthermore, an elastic abutment is provided on a side of the first sliding cavity away from the first opening, and the second piston can abut against the elastic abutment under the push of the elastic component.

[0020] Furthermore, the housing is provided with a first oil passage, a second oil passage, a third oil passage and a fourth oil passage, the first oil passage is connected with the push rod chamber, the second oil passage is connected with the load chamber, the third oil passage is connected with the push rod chamber and the braking device respectively, the fourth oil passage is connected with the load chamber and the braking device respectively, and the first oil passage, the second oil passage, the third oil passage and the fourth oil passage are all provided with switch valves.

[0021] Furthermore, the power assist assembly includes a sensor assembly and a driving member, the sensor assembly is used to collect the distance that the brake pedal drives the piston device to move, the driving member is transmission-connected to the brake piston, and the driving member can drive the brake piston to move.

[0022] Further, the elastic abutment member includes an elastic abutment portion and a second return spring. The elastic abutment member is arranged on a side of the first sliding cavity away from the first opening, and the second return spring is sleeved on the elastic abutment portion.

[0023] Furthermore, a first leather cup and a second leather cup are arranged in parallel and spaced apart in the first sliding cavity.

[0024] Beneficial effects of the present invention:

[0025] The braking system provided by the present invention has a first sliding chamber on the shell, a piston device is slidably arranged in the first sliding chamber and is connected to the brake pedal, a load chamber is arranged on the first sliding chamber, hydraulic oil is injected into the load chamber, when the driver steps on the brake pedal, the brake pedal drives the piston device to move along the first sliding chamber toward the side away from the first opening, and squeezes the hydraulic oil, the power-assisting component can push the brake piston of the brake cylinder to move, and the distance that the power-assisting component pushes the brake piston to move is positively correlated with the distance that the brake pedal drives the piston device to move, thereby generating a hysteresis feeling of braking; the load chamber is selectively connected to the piston chamber and the oil storage tank of the brake cylinder through the first valve assembly, when the power-assisting component fails, the first valve assembly connects the load chamber with the piston chamber of the brake cylinder, so that the hydraulic oil enters the brake cylinder to brake the vehicle, thereby ensuring emergency braking and protecting personal safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a cross-sectional view of a braking system of the present invention.

[0027] In the figure:

[0028] 1. Housing; 11. First leather cup; 12. Second leather cup; 13. First oil channel; 14. Third oil channel; 15. Fourth oil channel; 2. Piston device; 21. Pedal connecting member; 22. Push rod; 23. First piston; 231. First spring seat; 24. First return spring; 25. Connecting rod; 26. Second piston; 261. Second spring seat; 3. Braking device; 31. Moving part; 32. Connecting member; 33. Collecting part; 34. Driving member; 35. Braking cylinder; 4. Elastic abutting member; 41. Elastic abutting part; 42. Second return spring; 5. Oil storage tank. DETAILED DESCRIPTION

[0029] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and implementation methods. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention are shown in the accompanying drawings, rather than all of them.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0032] In order to use the braking system, it can truly simulate the hysteresis feeling of braking after stepping on the brake pedal and realize emergency braking in the case of power failure, such as Figure 1 As shown, the present invention provides a braking system. The braking system comprises: a housing 1, a piston device 2 and a braking device 3, wherein a first sliding cavity is provided along the length direction of the housing 1, and a first opening is provided on one side of the first sliding cavity; the piston device 2 is slidably arranged in the first sliding cavity, and the piston device 2 can slide along the first sliding cavity under the drive of the brake pedal; the piston device divides the first sliding cavity into an outer cavity with a variable volume and a load cavity, the first opening is arranged in the outer cavity, and hydraulic oil is injected into the load cavity; the braking device 3 comprises a booster assembly and a brake oil cylinder 35, the brake piston of the brake oil cylinder 35 brakes the vehicle by moving, the booster assembly can push the brake piston to move, and the distance that the booster assembly pushes the brake piston to move is positively correlated with the distance that the brake pedal drives the piston device to move, and the first valve assembly can make the load cavity selectively connected to the piston cavity of the brake oil cylinder and the oil storage tank 5, when the booster assembly works normally, the load cavity is connected to the oil storage tank 5, when the booster assembly fails, the load cavity is connected to the brake oil cylinder 35.

[0033] When the driver steps on the brake pedal, the brake pedal drives the piston device to move along the first sliding cavity toward the side away from the first opening and squeezes the hydraulic oil. The power-assisting assembly can push the brake piston of the brake cylinder 35 to move, and the distance that the power-assisting assembly pushes the brake piston to move is positively correlated with the distance that the brake pedal drives the piston device 2 to move, thereby generating a sense of braking lag; the load cavity is selectively connected to the piston cavity of the brake cylinder 35 and the oil storage tank 5 through the first valve assembly. When the power-assisting assembly fails, the first valve assembly connects the load cavity with the piston cavity of the brake cylinder 35, so that the hydraulic oil enters the brake cylinder 35 to brake the vehicle, thereby ensuring emergency braking and protecting personal safety.

[0034] Furthermore, the piston device 2 includes a first piston assembly and a second piston assembly, wherein one end of the first piston assembly extends relative to the first opening and is connected to the brake pedal, and the first piston assembly is slidably disposed in the first sliding cavity; the second piston assembly is slidably disposed in the first sliding cavity, and one end away from the load cavity is connected to the first piston assembly. After the brake pedal is stepped on, the first piston assembly drives the second piston assembly to move, and the hysteresis feeling after the brake pedal is stepped on can be further improved by setting the first piston assembly and the second piston assembly, thereby more realistically simulating the hysteresis feeling of stepping on the brake pedal and improving the driving experience of the driver.

[0035] Specifically, the first piston assembly includes a pedal connector 21, a push rod 22 and a first piston 23. One end of the pedal connector 21 is connected to the brake pedal, and the other end is connected to the first end of the push rod 22 extending relative to the first opening. The push rod 22 is connected to the first piston 23, and the first piston 23 can slide along the first sliding cavity under the push of the push rod 22. In this embodiment, one end of the push rod 22 connected to the first piston 23 has a ball head structure, which can convert forces from different angles of the brake pedal into axial forces acting on the first piston 23; by providing the pedal connector 21, it is convenient to connect the first piston assembly to the brake pedal.

[0036] Furthermore, the part of the first sliding chamber between the first piston assembly and the second piston assembly is a push rod chamber, in which hydraulic oil is filled. The push rod chamber is selectively connected to the piston chamber of the brake oil cylinder 35 and the oil storage tank 5 through the second valve assembly. When the booster assembly works normally, the push rod chamber is connected to the oil storage tank 5. When the booster assembly fails, the hydraulic oil in the load chamber enters the brake oil cylinder 35 to push the brake piston to brake the vehicle. Specifically, in order to prevent the leakage of hydraulic oil, a first leather cup 11 and a second leather cup 12 are arranged in parallel and spaced in the first sliding chamber. The first leather cup 11 and the second leather cup 12 are respectively arranged at both ends of the push rod chamber to seal the push rod chamber. By setting the push rod chamber and filling the push rod chamber with hydraulic oil, on the one hand, the speed of force transmission between the first piston assembly and the second piston assembly can be delayed, thereby increasing the hysteresis of braking; on the other hand, when the booster assembly fails, the hydraulic oil in the load chamber enters the brake device 3 to assist the braking, further improving the response speed of the braking.

[0037] Furthermore, the second piston assembly includes an elastic assembly and a second piston 26, one end of the elastic assembly is connected to the first piston 23, and the other end is connected to the second piston 26, and the second piston 26 is slidably disposed in the first sliding cavity. The first piston 23 squeezes the elastic assembly, and the elastic assembly then transmits force to the second piston 26.

[0038] Specifically, the elastic component includes a first return spring 24 and a connecting rod 25. In order to prevent the first return spring 24 from bending during the force transmission process, a connecting rod 25 is optionally provided between the first piston 23 and the second piston 26. One end of the connecting rod 25 is slidably connected to the first spring seat 231 of the first piston 23 and can slide relative to the first piston 23; the other end of the connecting rod 25 is connected to the second spring seat 261 of the second piston 26, and the first return spring 24 is sleeved on the connecting rod 25. By providing the first return spring 24, the first piston 23 can be pushed to return after the pedaling force of the brake pedal is removed.

[0039] Furthermore, an elastic abutment member 4 is provided on one side of the first sliding cavity away from the first opening, and the second piston 26 can abut against the elastic abutment member 4 under the push of the first return spring 24. Under the action of the second piston 26, the elastic abutment member 4 is elastically deformed, and at the same time, the elastic deformation force is applied to the second piston 26, which is then transmitted to the first piston 23 and finally to the brake pedal, thereby realizing force feedback.

[0040] Specifically, in this embodiment, the elastic abutment member 4 includes an elastic abutment portion 41 and a second return spring 42. The elastic abutment portion 41 is disposed on a side of the first sliding cavity away from the first opening, and the material of the elastic abutment portion 41 is rubber. In order to further enhance the feedback force, a second return spring 42 is sleeved on the elastic abutment portion 41, and one end of the second return spring 42 abuts against the second piston 26. When the force of the brake pedal is removed, the elastic abutment portion 41 and the second return spring 42 push the second piston 26 to return to its original position.

[0041] Specifically, the elastic abutment 4 is in a cone shape, and a groove matching with the elastic abutment 4 is formed on the second piston 26. The second piston 26 squeezes the elastic abutment 4 through the groove to deform.

[0042] Furthermore, the housing 1 is provided with a first oil passage 13, a second oil passage, a third oil passage 14 and a fourth oil passage 15, the first oil passage 13 is connected to the push rod cavity, the second oil passage is connected to the load cavity, the third oil passage 14 is connected to the push rod cavity and the brake device 3 respectively, the fourth oil passage 15 is connected to the load cavity and the brake device 3 respectively, and a switch valve is provided on the first oil passage 13, the second oil passage, the third oil passage 14 and the fourth oil passage 15. Specifically, the oil storage tank 5 supplies oil to the push rod cavity through the first oil passage 13 and supplies oil to the load cavity through the second oil passage. When the power-assisting component of the brake device 3 can work normally, the switch valve on the first oil channel 13, the switch valve on the third oil channel 14 and the switch valve on the fourth oil channel 15 are all in a closed state, and the hydraulic oil in the load chamber enters the oil storage tank 5 through the second oil channel; when the power-assisting component fails, the switch valve on the first oil channel 13 and the switch valve on the second oil channel are both closed; the switch valve on the third oil channel 14 and the switch valve on the fourth oil channel 15 are opened, so that the hydraulic oil enters the brake cylinder 35 for brake assist.

[0043] Furthermore, the power assist assembly includes a sensor assembly and a driver 34. The sensor assembly is used to collect the distance that the brake pedal drives the piston device to move. The driver 34 is in transmission connection with the brake piston, and the driver 34 can drive the brake piston to move. After the sensor assembly detects the displacement of the push rod 22, the driver 34 is controlled by the controller to brake the vehicle. Specifically, the use of a sensor to control the driver 34 through the controller is a prior art and will not be described in detail here.

[0044] Specifically, the sensor assembly includes a moving part 31 and a collecting part 33. A second sliding cavity parallel to the first sliding cavity is provided on the housing 1. The moving part 31 is arranged in the second sliding cavity and connected to the first piston 23 through a connecting member 32. The collecting part 33 is electrically connected to the driving member 34 through a controller. The collecting part 33 is arranged outside the housing 1 and is used to collect the displacement of the moving part 31. By collecting the displacement of the first piston 23, the braking intention issued by the driver is collected and the vehicle is braked. Of course, in other embodiments, other displacement sensors can also be selected to collect the displacement of the first piston 23, and no excessive restrictions are made here.

[0045] Furthermore, when the acquisition unit 33 acquires the displacement of the moving unit 31, the control driving member 34 drives the brake piston of the brake oil cylinder 35 to move, thereby braking the vehicle; when the acquisition unit 33 or the driving member 34 has a problem, the switch valves on the third oil channel 14 and the fourth oil channel 15 are both opened, so that the hydraulic oil enters the brake oil cylinder 35 under the action of the first piston 23 and the second piston 26, and pushes the brake piston of the brake oil cylinder 35 to work, thereby braking the vehicle. In the whole process, the driver only needs to overcome the spring force of the first return spring 24 and the second return spring 42. Since the first return spring 24 and the second return spring 42 are both small return springs, the force provided is small, which ensures the efficiency of converting the force of the brake pedal into the hydraulic pressure of the brake oil cylinder 35 during the power failure process.

[0046] Compared with traditional spring simulators, this braking system provides a realistic hydraulic pedal feel. The hysteresis during the brake pedal return process is significantly better than that of traditional spring simulators, and the braking efficiency is much higher than that of spring simulators when the power assist fails.

[0047] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A braking system, characterized in that: include: A housing (1), the housing (1) being provided with a first sliding cavity, and one side of the first sliding cavity having a first opening; A piston device (2) is slidably arranged in the first sliding chamber, and the piston device (2) can slide along the first sliding chamber under the drive of the brake pedal, the piston device (2) divides the first sliding chamber into an outer chamber with a variable volume and a load chamber, the first opening is arranged in the outer chamber, and hydraulic oil is injected into the load chamber; A brake device (3), comprising a power assist assembly and a brake oil cylinder (35), wherein a brake piston of the brake oil cylinder (35) brakes a vehicle by moving, the power assist assembly can push the brake piston to move, and the distance that the power assist assembly pushes the brake piston to move is positively correlated with the distance that the brake pedal drives the piston device to move; The first valve assembly enables the load chamber to selectively connect to the piston chamber of the brake oil cylinder (35) and the oil storage tank (5); when the power-assist assembly works normally, the load chamber connects to the oil storage tank (5); when the power-assist assembly fails, the load chamber connects to the brake oil cylinder (35).

2. A braking system according to claim 1, characterized in that: The piston device (2) comprises: A first piston assembly, one end of which extends relative to the first opening and is connected to the brake pedal, and the first piston assembly is slidably disposed in the first sliding cavity; The second piston assembly is slidably disposed in the first sliding cavity, and one end of the second piston assembly that is away from the load cavity is connected to the first piston assembly.

3. A braking system according to claim 2, characterized in that: The first piston assembly includes a pedal connector (21), a push rod (22) and a first piston (23). One end of the pedal connector (21) is connected to the brake pedal, and the other end is connected to the push rod (22). The push rod (22) is connected to the first piston (23). The first piston (23) can slide along the first sliding cavity under the push of the push rod (22).

4. A braking system according to claim 3, characterized in that: The part of the first sliding chamber located between the first piston assembly and the second piston assembly is a push rod chamber, the push rod chamber is filled with hydraulic oil, and the push rod chamber is selectively connected to the piston chamber of the brake cylinder and the oil storage tank (5) through the second valve assembly.

5. A braking system according to claim 3, characterized in that: The second piston assembly comprises an elastic assembly and a second piston (26); one end of the elastic assembly is connected to the first piston (23), and the other end is connected to the second piston (26); the second piston (26) is slidably disposed in the first sliding chamber.

6. A braking system according to claim 5, characterized in that: An elastic abutment member (4) is provided on a side of the first sliding cavity away from the first opening, and the second piston (26) can abut against the elastic abutment member (4) under the push of the elastic component.

7. A braking system according to claim 4, characterized in that: The housing (1) is provided with a first oil passage (13), a second oil passage, a third oil passage (14) and a fourth oil passage (15); the first oil passage (13) is in communication with the push rod chamber, the second oil passage is in communication with the load chamber, the third oil passage (14) is in communication with the push rod chamber and the brake device (3) respectively, and the fourth oil passage (15) is in communication with the load chamber and the brake device (3) respectively; the first oil passage (13), the second oil passage, the third oil passage (14) and the fourth oil passage (15) are all provided with switch valves.

8. A braking system according to claim 7, characterized in that: The power assist assembly comprises a sensor assembly and a driving member (34), wherein the sensor assembly is used to collect the distance that the brake pedal drives the piston device (2) to move, and the driving member (34) is in transmission connection with the brake piston, and the driving member (34) can drive the brake piston to move.

9. A braking system according to claim 6, characterized in that: The elastic abutment member (4) comprises an elastic abutment portion (41) and a second return spring (42); the elastic abutment member (4) is arranged on a side of the first sliding cavity away from the first opening; and the second return spring (42) is sleeved on the elastic abutment portion (41).

10. A braking system according to claim 1, characterized in that: A first leather cup (11) and a second leather cup (12) are arranged in parallel and spaced apart in the first sliding cavity.

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