CN213598459U - Braking system for braking when difference between disc surface and edge surface occurs - Google Patents

Abstract

The utility model relates to a braking system of quotation and edgewise braking when poor can reduce or avoid unfavorable impact in the braking later stage to effectively guarantee quotation braking piece return and anticipated braking response effect. The brake comprises a brake caliper, a face cylinder and a disc surface cylinder, wherein a first piston, a second piston, a working cavity and a buffer cavity are arranged in the disc surface cylinder, and a traction buffer assembly is arranged between the second piston and the first piston; a control rod is fixedly arranged on the second piston, a control block matched with an adjusting block driven by a reciprocating motor to reciprocate in a set moving interval is arranged on the control rod, a buffer spring is fixedly connected to the adjusting block, and a pressure sensor is arranged on a plate surface branch road; the side wall of the buffer cavity is communicated with a surface bypass and is provided with an electric control one-way valve which is electrically connected with an electronic control device; the second piston is provided with a flow guide channel for communicating the working cavity and the buffer cavity and an electric control valve electrically connected with the electronic control device.

Description

Braking system for braking when difference between disc surface and edge surface occurs

Technical Field

The utility model belongs to the technical field of braking system, concretely relates to braking system of quotation and poor time braking of face.

Background

A conventional brake system includes: brake pedal, brake master cylinder, pump, brake pipe way, return oil pipe way, two valves and the electronic control device who is used for the control valve. Wherein the brake master cylinder is interlocked with the brake pedal to obtain a brake stroke with reliable force feedback, the brake is mounted on the wheel hub to apply braking by driving the pads through the hydraulic cylinder thereon to press the brake disc on the wheel hub, and the higher the pressure of the hydraulic oil supplied to the hydraulic cylinder is, the greater the braking force of the pads on the brake disc is.

The pressure of the hydraulic oil of the hydraulic cylinder on the brake is provided by the pump through the brake pipeline, and the pressure of the hydraulic oil entering the hydraulic cylinder on the brake through the brake pipeline is increased by the pump according to the increase of the stroke of the brake pedal, so that the braking force of the brake disc on the hub is increased. The oil return line is used for releasing pressure of hydraulic oil in a hydraulic cylinder of the brake (for example, returning to a hydraulic oil tank) when the brake pedal rebounds (the brake pedal rebounds to release the brake on the wheel hub). One of the two valves is arranged on the brake pipeline, the other valve is arranged on the oil return pipeline, the electronic control device is used for controlling the opening and closing of the two valves, and the control time is as follows: when a driver steps on a brake pedal and needs to brake, the electronic control device controls a valve arranged on a brake pipeline to be opened, and closes a valve arranged on an oil return pipeline, so that the pressure of hydraulic oil in a hydraulic cylinder on the brake is increased, and the brake is further implemented; when the driver releases the brake pedal and the brake pedal rebounds to release the brake, the electronic control device controls the valve installed on the oil return pipeline to close, and then the hydraulic oil in the hydraulic cylinder is decompressed.

Chinese published patent literature (CN 106151319A) discloses a novel braking system, which includes a brake caliper, a brake disc and a brake module, wherein the brake caliper has an arc-shaped cavity structure, the brake module includes a first brake component and a second brake component, the first brake component and the second brake component are located in the cavity structure of the brake caliper, the first brake component is used for braking the disc surface of the brake disc, and the second brake component is used for braking the edge surface of the brake disc. The braking on the disc surface of the brake disc and the brake disc along the surface can be simultaneous braking and differential braking, and the simultaneous braking can prevent traffic accidents in emergency situations.

However, in the process of increasing the pressure in the brake pipe, the pump inevitably generates pressure pulses in the hydraulic oil due to its own operating characteristics, and the fluctuation of the pressure pulses is particularly obvious in the later period of pressure increase.

In addition, in consideration of the stability required to be ensured for the braking operation of structures such as vehicles and the like, the sensitivity is also important, so that a reset piece which is convenient for the brake pad to reset is required to be arranged, the conventional disk brake pad generally controls the friction plate to reset through the elastic resetting capability of an elastic piece, and the reset structure may have the situation that the friction plate cannot normally reset, so that the brake pad still makes frictional contact with the brake disk after the braking is released, thereby not only increasing unnecessary energy consumption, but also causing serious abrasion of the brake pad and having a short service life.

In addition, after the brake pad is worn, the safety clearance between the brake pad and the brake disc is increased, so that a longer brake stroke is needed in the initial braking stage to enable the brake pad and the brake disc to generate braking force, the braking response is deteriorated, and the maximum braking pressure is also influenced.

Therefore, there is a need to develop a brake system that can solve the above technical drawbacks.

SUMMERY OF THE UTILITY MODEL

In view of prior art's not enough, the utility model aims to solve the technical problem that a quotation and the braking system of edgewise braking are provided, it can reduce or avoid unfavorable impact in the braking later stage to effectively guarantee quotation braking piece return and anticipated braking response effect.

In order to solve the technical problem, the utility model discloses a technical scheme is:

the braking system comprises an electronic control device, a brake, a braking oil path and an oil return pipeline, wherein the braking oil path and the oil return pipeline are respectively connected with the brake;

the brake comprises a brake caliper, and an edge braking assembly and a disc surface braking assembly which are arranged on the brake caliper, wherein the edge braking assembly comprises an edge cylinder which is arranged on the brake caliper and corresponds to the edge surface of the brake disc, the disc surface braking assembly comprises a disc surface cylinder which is arranged on the brake caliper and corresponds to the disc surface of the brake disc, a first piston and a second piston are arranged in the disc surface cylinder in a sliding and sealing mode, a reset spring is arranged between the first piston and the inner wall of the first end of the disc surface cylinder, a working cavity is arranged between the second piston and the second end of the disc surface cylinder, and a buffer cavity and a traction buffer assembly are arranged between the second piston and the first piston;

a control rod is fixedly arranged on one side of the second piston, which is far away from the first piston, the other end of the control rod penetrates through the second end of the disc cylinder, a control block is arranged at the other end of the control rod, a reciprocating motor electrically connected with an electronic control device is arranged outside the second end of the disc cylinder, the output end of the reciprocating motor is connected with a screw rod, an adjusting block is arranged on the screw rod in a threaded manner, the control rod penetrates through the adjusting block, a buffer spring is fixedly connected to one side of the adjusting block, which faces the control block, the elastic coefficient of the buffer spring is larger than that of a return spring, the compression amount of the buffer spring is larger than the maximum stroke of the traction block in the buffer chamber, and a gap is reserved between the buffer spring and the control block in an initial state to be a brake stroke of the;

the brake oil way comprises a brake main path, an edge surface branch path connecting the edge surface cylinder and the brake main path, and a disc surface branch path connecting the disc surface cylinder and the brake main path, wherein the edge surface branch path is provided with an edge surface brake valve electrically connected with the electronic control device, the position of the disc surface branch path close to the oil port is provided with a pressure sensor, and an oil return port of the edge surface cylinder is communicated to an oil return pipeline through an oil return branch path;

the side wall of the buffer cavity is communicated with a surface bypass, the other end of the surface bypass is communicated to the surface cylinder, and an electric control one-way valve electrically connected with an electronic control device is arranged on the surface bypass; and a flow guide channel for communicating the working cavity with the buffer cavity is formed in the second piston, and an electric control valve electrically connected with the electronic control device is arranged in the flow guide channel.

Preferably, the traction buffer assembly comprises a buffer sleeve fixedly mounted on the side surface of the first piston close to the second piston and a traction rod fixedly mounted on the side surface of the second piston close to the first piston, a buffer chamber with a buffer space is arranged in the buffer sleeve, one end of the buffer chamber is open, the other end of the traction rod extends into the buffer chamber through the opening of the buffer chamber, and a traction block in sliding fit with the buffer chamber is arranged at the end of the traction rod.

Preferably, the control rod is connected with the disk surface cylinder through a sliding sealing piece.

Preferably, the adjusting block, the control block and the screw rod are all arranged in a protective shell, and the protective shell is fixedly arranged outside the second end of the pan surface cylinder.

Preferably, the bottom of the protective shell is provided with a guide rail, the bottom of the adjusting block is provided with a sliding block, and the sliding block is in sliding fit in the guide rail.

Preferably, a supporting mechanism is connected between the protective shell and the disk surface cylinder.

Preferably, a sealing ring is arranged between the control rod and the second piston.

Compared with the prior art, the utility model discloses following beneficial effect has:

the utility model discloses a braking system includes edge braking subassembly and quotation braking subassembly, be equipped with first piston and second piston in the quotation jar of quotation braking subassembly, be equipped with the working chamber between second piston and the quotation jar, and be equipped with cushion chamber and tractive buffering subassembly between first piston and the second piston, be equipped with water conservancy diversion passageway and the automatically controlled valve of intercommunication working chamber and cushion chamber on the second piston, the cushion chamber is equipped with edge bypass and the automatically controlled check valve of communicating with the edge jar, the opposite side of second piston is connected with the control lever, be equipped with on the control lever with by the adjusting block matched with of reciprocating motor drive at the interval reciprocating displacement of setting for the activity, and fixedly connected with buffer spring on the adjusting block, and be equipped with pressure sensor on the quotation branch road, can realize edge and quotation braking when poor, and when the hydraulic oil pressure in the braking later stage reaches preset oil pressure, under the condition of making first piston keep the normal position or go forward slightly to the brake disc, because the adjusting block can provide powerful support with lead screw thread fit, utilize buffer spring to absorb the impact, and because the surge chamber still has the buffering space, the displacement of second piston can not produce mechanical action to first piston, but greatly reduced or avoid the impact to first piston to guarantee the stable braking efficiency of quotation braking piece in braking later stage. And moreover, after the brake pedal is released, the reciprocating motor can be started to drive the adjusting block to move away from the brake disc, the second piston is pulled through the squeezing and pushing action of the adjusting block on the control block, and the first piston is pulled to return together when the pulling buffer assembly is reset, so that the phenomenon that the brake disc is still in contact friction with the brake disc after the brake is released can be avoided, and the service life of the brake disc is effectively prolonged. In addition, when the brake disc of the disc surface is worn and the gap between the brake disc and the brake disc is increased, the braking response is not as expected, the movable section of the adjusting block can be adjusted by wholly approaching the brake disc, but the section length is still consistent, and the front and back adjustment amount of the movable section is set according to the wear amount, so that the expected braking response effect is achieved.

Drawings

Fig. 1 is a schematic structural diagram of the braking system of the present invention.

Fig. 2 is a schematic view of the initial state structure of the brake of the present invention.

Fig. 3 is a partially enlarged view of a shown in fig. 2.

Fig. 4 is a partially enlarged view B shown in fig. 2.

Fig. 5 is a partial enlarged view of C shown in fig. 2.

Fig. 6 is a schematic diagram of the working state of the brake in the earlier stage of braking.

Fig. 7 is the utility model discloses the stopper reaches and predetermines the oil pressure state schematic diagram.

Fig. 8 is a schematic diagram of the brake in the later stage of braking.

Fig. 9 is a schematic diagram of the brake of the present invention in a state that the brake disc is pulled back to the position after the brake is completed in the later stage of braking.

Fig. 10 is a schematic diagram of the brake disc brake pad of the present invention in a state of being pulled back to the place after the brake is completed in an early stage.

Fig. 11 is a front-back comparison schematic view of the adjusting block according to the wear amount of the brake pad on the disc surface.

The labels in the figure are: 100. a brake; 101. a working chamber; 102. a buffer chamber; 103. a flow guide channel; 200. a brake pump; 10. a brake caliper; 20. a dough cylinder; 21. an edge brake pad; 30. a pan surface cylinder; 31. a first piston; 32. a second piston; 33. a disc surface brake pad; 34. a return spring; 41. a buffer sleeve; 42. a traction rod; 43. a pulling block; 51. a control lever; 52. a control block; 53. a buffer spring; 54. threading holes; 60. a protective shell; 61. a reciprocating motor; 62. a screw rod; 63. an adjusting block; 64. a guide rail; 65. a support mechanism; 301. braking the main road; 302. a branch is arranged on the disc surface; 303. along the face branch; 304. an oil return branch; 305. an edge bypass; 306. an oil return line; 401. an oil inlet valve; 402. an edge brake valve; 403. an oil return valve; 404. an electrically controlled valve; 405. an electrically controlled check valve; 406. a pressure sensor; 400. and an oil tank.

Detailed Description

In order to make the aforementioned and other features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

As shown in fig. 1 to 11, the present embodiment provides a braking system for braking when the disc surface is different from the edge surface, the braking system includes a brake 100, a master cylinder, a brake pedal, a brake pump 200 and an electronic control device, the master cylinder and the brake pedal are linked to obtain a braking stroke with reliable force feedback, the brake 100 is installed on a wheel hub to drive a friction block through a hydraulic cylinder thereon to press a brake disc on the wheel hub to perform braking, the pressure of hydraulic oil of the hydraulic cylinder on the brake 100 is provided by the brake pump 200 through a brake oil path, and the brake pump 200 increases the pressure of hydraulic oil entering the hydraulic cylinder on the brake 100 through the brake oil path according to the increase of the stroke of the brake pedal, thereby increasing the braking force on the brake disc of the wheel hub. The brake oil path is connected with the brake 100, an oil return pipeline 306 is further connected to the brake 100, an oil return valve 403 is arranged on the oil return pipeline 306, and the brake oil path and the oil return pipeline 306 are both connected to the oil tank 400.

In the present embodiment, the brake 100 includes a caliper 10, and a surface brake assembly and a disc surface brake assembly provided on the caliper 10, the surface brake assembly includes a surface cylinder 20 mounted on a surface of the caliper 10 corresponding to a brake disc, and a surface piston slidably and sealingly provided in the surface cylinder 20, and one side of the surface piston facing the brake disc passes through the surface cylinder 20 and is fixedly connected to a surface brake pad 21. The brake oil path comprises a brake main path 301 connected with the brake pump 200 and the brake main cylinder, an edge surface branch path 303 connecting the edge surface cylinder 20 and the brake main path 301, a connecting disc surface cylinder 30 and a disc surface branch path 302 of the brake main path 301, a first oil inlet of the edge surface cylinder 20 is communicated to the brake oil path through the edge surface branch path 303, an edge surface brake valve 402 electrically connected with an electronic control device is arranged on the edge surface branch path 303, and an oil inlet valve 401 is arranged on the brake main path 301 close to the brake pump 200. The face cylinder 20 is further provided with an oil return port, and the oil return port is communicated to an oil return pipeline 306 through an oil return branch 304.

The disc surface brake assembly comprises a disc surface cylinder 30 which is installed on the brake caliper 10 and corresponds to the disc surface of a brake disc, a first piston 31 and a second piston 32 are arranged in the disc surface cylinder 30 in a sliding and sealing mode, a disc surface brake disc 33 is installed on one side, far away from the second piston 32, of the first piston 31 through a piston rod, and a return spring 34 is arranged between the first piston 31 and the inner wall of the first end of the disc surface cylinder 30. Preferably, the disk surface brake pads 33 are arranged to be offset from the surface brake pads 21 in the circumferential direction of the brake disk.

A working cavity 101 is arranged between the second piston 32 and the second end of the disc surface cylinder 30, a buffer cavity 102 and a traction buffer assembly are arranged between the second piston 32 and the first piston 31, a surface bypass 305 is arranged on the side wall of the buffer cavity 102 in a communicating manner, the pipe diameter of the surface bypass 305 is smaller than that of the main brake path 301 and the disc surface branch path 302, the other end of the surface bypass 305 is communicated to a second oil inlet of the surface cylinder 20, an electric control one-way valve 405 electrically connected with an electronic control device is arranged on the surface bypass 305, an oil port arranged in a communicating manner with the disc surface branch path 302 is arranged on the side wall of the working cavity 101, and the oil port is further connected with an oil return pipeline 306. And a pressure sensor 406 is arranged at the position of the disc surface branch 302 close to the oil port.

The traction buffering assembly comprises a buffering sleeve 41 fixedly mounted on the side surface of the first piston 31 close to the second piston 32 and a traction rod 42 fixedly mounted on the side surface of the second piston 32 close to the first piston 31, a buffering chamber with a buffering space is arranged in the buffering sleeve 41, one end of the buffering chamber is open, the other end of the traction rod 42 extends into the buffering chamber through the opening of the buffering chamber, a traction block 43 in sliding fit with the buffering chamber is arranged at the end of the traction rod, the traction block 43 cannot pass through the opening of the buffering chamber, so that the first piston 31 can drive the second piston 32 to advance when advancing towards a brake disc, and the second piston 32 can approach the first piston 31 at the later stage of braking, so that the volume of the buffering cavity 102 is reduced.

In this embodiment, a control rod 51 is fixedly mounted on a side of the second piston 32 away from the first piston 31, the other end of the control rod 51 passes through the second end of the disc surface cylinder 30, a control block 52 is disposed on the other end of the control rod 51, and the control rod 51 is connected with the disc surface cylinder 30 through a sliding seal (not shown in the figure). A reciprocating motor 61 electrically connected with an electronic control device is arranged outside the second end of the pan surface cylinder 30, the output end of the reciprocating motor 61 is connected with a screw rod 62, an adjusting block 63 is installed on the screw rod 62 in a threaded manner, the control rod 51 passes through an adjusting block 63, a buffer spring 53 is fixedly connected to one side of the adjusting block 63 facing the control block 52, the elastic coefficient of the buffer spring 53 is greater than that of the return spring 34, the compression amount of the buffer spring 53 is larger than the maximum stroke of the traction block 43 in the buffer chamber, a gap is left between the buffer spring 53 and the control block 52 in the initial state to be the braking stroke of the first piston 31 under the preset oil pressure, the preset oil pressure is 70-80% of the maximum pressure formed by the braking of the hydraulic oil, that is, when the hydraulic oil pressure in the disc surface cylinder 30 reaches 70% -80% of the maximum value, the control block 52 just abuts against the buffer spring 53.

Preferably, the adjusting block 63, the control block 52 and the screw rod 62 are all arranged in a protective shell 60, the protective shell 60 is fixedly arranged outside the second end of the pan cylinder 30, and the tail end of the screw rod 62 is arranged on the inner wall of the protective shell 60 through a bearing seat. Further, the bottom of the protective shell 60 is provided with a guide rail 64, and the bottom of the adjusting block 63 is provided with a sliding block, wherein the sliding block is in sliding fit with the guide rail 64 and plays a role in guiding and stabilizing motion. A supporting mechanism 65 is connected between the protective shell 60 and the disk surface cylinder 30.

In this embodiment, the second piston 32 is provided with a flow guide channel 103 for communicating the working chamber 101 and the buffer chamber 102, an electric control valve 404 for changing the on-off state of the flow guide channel 103 is disposed in the flow guide channel 103, and the electric control valve 404 is electrically connected to the electronic control device. Preferably, an axially through threading hole 54 is formed in the control rod 51, and a control line of the electronic control valve 404 passes through the threading hole 54 and is electrically connected with an electronic control device. A sealing ring is arranged between the control rod 51 and the second piston 32.

The working process of the brake system of the embodiment is as follows:

s1, pressing a brake pedal, opening an oil inlet valve 401, opening an electric control valve 404, closing an oil return valve 403, a face brake valve 402 and an electric control one-way valve 405, operating the brake pump 200, and allowing hydraulic oil to enter the working cavity 101 through a brake oil way and flow to the buffer cavity 102 through a flow guide channel 103;

s2, as the stroke of the brake pedal increases, the pressure of the hydraulic oil provided by the brake pump 200 also increases correspondingly, the first piston 31 is driven to displace toward the brake disc against the return spring 34, and the second piston 32 is driven to displace toward the brake disc synchronously by pulling the buffer assembly, at this stage, the distance between the first piston 31 and the second piston 32 is unchanged, that is, the volume of the buffer cavity 102 is unchanged, as shown in fig. 6;

s3, when the oil pressure reaches 70% -80% of the maximum value, the control block 52 contacts the buffer spring 53, and the electric control valve 404 is closed, which is shown in reference to FIG. 7;

s4, the brake pedal stroke continues to increase, the pressure in the working chamber 101 increases to overcome the buffer spring 53, the second piston 32 is driven to compress the buffer chamber 102 and pull the buffer assembly to compress the buffer chamber, at this time, the electrically controlled check valve 405 opens, so that the hydraulic oil in the buffer chamber 102 slowly flows to the facing cylinder 20 through the facing bypass 305, the flow rate of the facing bypass 305 is controlled to keep the first piston 31 at the original position or slightly advance toward the brake disc, the facing brake valve 402 opens, a part of the hydraulic oil on the brake oil path enters the working chamber 101 of the disc cylinder 30, and another part enters the facing cylinder 20 through the facing bypass 303, i.e. the disc and the facing are in the braking state at this stage, which effectively enhances the braking force, as shown in fig. 8;

if the brake pedal is released after the braking is completed in step S4, step S52 is executed: referring to fig. 9, the oil inlet valve 401 and the face brake valve 402 are closed, the oil return valve 403 is opened, hydraulic oil in the working chamber 101 enters the oil return line 306 from an oil port, hydraulic oil in the buffer chamber 102 enters the oil return branch 304 from the face bypass 305 and the face cylinder 20, meanwhile, the second piston 32 is displaced away from the brake disc under the action of the buffer spring 53, the first piston 31 is displaced away from the brake disc under the action of the return spring 34, then the reciprocating motor 61 is started to drive the adjusting block 63 to be displaced away from the brake disc, the second piston 32 is pulled through the squeezing and pushing action of the adjusting block 63 on the control block 52, and the first piston 31 is pulled to return together when the pulling and buffering assembly is reset, so that the phenomenon that the disc brake disc 33 is not in contact with the brake disc after the brake is released can be avoided, and. The displacement of the adjusting block 63 is set according to a program, so that the adjusting block 63 reciprocates within a set range. When returning to the proper position, the reciprocating motor 61 reverses direction to return the adjustment block 63 and the damping spring 53 to wait for the next braking.

If the brake pedal is released after the braking is completed in step S2, step S51 is executed: referring to fig. 10, hydraulic oil in the buffer chamber 102 enters the working chamber 101 through the flow guide passage 103, the hydraulic oil in the working chamber 101 enters the oil return line 306 from the oil port, the first piston 31 is displaced away from the brake disc under the action of the return spring 34, then the reciprocating motor 61 is started to drive the adjusting block 63 to displace away from the brake disc, and the second piston 32 and the first piston 31 are pulled to return by the squeezing action of the adjusting block 63 on the control block 52, so that the phenomenon that the disc surface brake pad 33 still contacts and rubs with the brake disc after the brake is released can be avoided, and the service life of the disc surface brake pad 33 can be effectively prolonged. The displacement of the adjusting block 63 is set according to a program, so that the adjusting block 63 reciprocates within a set range. When returning to the proper position, the reciprocating motor 61 reverses direction to return the adjustment block 63 and the damping spring 53 to wait for the next braking.

In the above step S4, when the oil pressure continues to increase to the brake pump 200 to generate the pressure pulse in the working chamber 101, the adjusting block 63 and the lead screw 62 are screwed to provide a strong support, the buffer spring 53 is used to absorb the impact, and the buffer chamber still has a buffer space, so that the displacement of the second piston 32 does not generate a mechanical force on the first piston 31, and the impact on the first piston 31 can be greatly reduced or avoided, thereby ensuring stable braking effectiveness of the disc surface brake pad 33 in the later braking period.

Further, when the disc surface brake pad 33 is worn and the clearance between the disc surface brake pad and the brake disc is increased, the braking response is not as expected, and at this time, the active section of the adjusting block 63 can be adjusted by being entirely close to the brake disc, but the section length is still the same, and the front and rear adjustment amount of the active section is set according to the wear amount, as shown in fig. 11.

Having shown and described the fundamental principles and the principal features of the invention and its advantages, it will be understood by those skilled in the art that the present invention is not limited by the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.

Claims (7)

1. Braking system of quotation and poor time braking of edgewise, including electronic control device, stopper and the brake oil circuit of being connected with the stopper respectively and return oil pipe way, be equipped with inlet valve and brake pump on the brake oil circuit, be equipped with return oil valve, its characterized in that on returning oil pipe way:

the brake comprises a brake caliper, and an edge braking assembly and a disc surface braking assembly which are arranged on the brake caliper, wherein the edge braking assembly comprises an edge cylinder which is arranged on the brake caliper and corresponds to the edge surface of the brake disc, the disc surface braking assembly comprises a disc surface cylinder which is arranged on the brake caliper and corresponds to the disc surface of the brake disc, a first piston and a second piston are arranged in the disc surface cylinder in a sliding and sealing mode, a reset spring is arranged between the first piston and the inner wall of the first end of the disc surface cylinder, a working cavity is arranged between the second piston and the second end of the disc surface cylinder, and a buffer cavity and a traction buffer assembly are arranged between the second piston and the first piston;

a control rod is fixedly arranged on one side of the second piston, which is far away from the first piston, the other end of the control rod penetrates through the second end of the disc cylinder, a control block is arranged at the other end of the control rod, a reciprocating motor electrically connected with an electronic control device is arranged outside the second end of the disc cylinder, the output end of the reciprocating motor is connected with a screw rod, an adjusting block is arranged on the screw rod in a threaded manner, the control rod penetrates through the adjusting block, a buffer spring is fixedly connected to one side of the adjusting block, which faces the control block, the elastic coefficient of the buffer spring is larger than that of a return spring, the compression amount of the buffer spring is larger than the maximum stroke of the traction block in the buffer chamber, and a gap is reserved between the buffer spring and the control block in an initial state to be a brake stroke of the;

the brake oil way comprises a brake main path, an edge surface branch path connecting the edge surface cylinder and the brake main path, and a disc surface branch path connecting the disc surface cylinder and the brake main path, wherein the edge surface branch path is provided with an edge surface brake valve electrically connected with the electronic control device, the position of the disc surface branch path close to the oil port is provided with a pressure sensor, and an oil return port of the edge surface cylinder is communicated to an oil return pipeline through an oil return branch path;

the side wall of the buffer cavity is communicated with a surface bypass, the other end of the surface bypass is communicated to the surface cylinder, and an electric control one-way valve electrically connected with an electronic control device is arranged on the surface bypass; and a flow guide channel for communicating the working cavity with the buffer cavity is formed in the second piston, and an electric control valve electrically connected with the electronic control device is arranged in the flow guide channel.

2. The disk surface-to-edge surface differential time braking system of claim 1, wherein: the traction buffer assembly comprises a buffer sleeve fixedly mounted on the side face of the first piston close to the second piston and a traction rod fixedly mounted on the side face of the second piston close to the first piston, a buffer chamber with a buffer space is arranged in the buffer sleeve, one end of the buffer chamber is open, the other end of the traction rod extends into the buffer chamber through the opening of the buffer chamber, and a traction block in sliding fit with the buffer chamber is arranged at the end of the traction rod.

3. The disk surface-to-edge surface differential time braking system of claim 1, wherein: the control rod is connected with the disk surface cylinder through a sliding sealing piece.

4. The disk surface-to-edge surface differential time braking system of claim 1, wherein: the adjusting block, the control block and the screw rod are all arranged in a protective shell, and the protective shell is fixedly arranged outside the second end of the disc cylinder.

5. The disk surface-to-edge surface differential time braking system of claim 4, wherein: the protective housing bottom is equipped with the guided way, adjusting block bottom is equipped with the slider, slider sliding fit is in the guided way.

6. The disk surface-to-edge surface differential time braking system of claim 4, wherein: and a supporting mechanism is connected between the protective shell and the disk surface cylinder.

7. The disk surface-to-edge surface differential time braking system of claim 1, wherein: and a sealing ring is arranged between the control rod and the second piston.

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