CN112428973A

CN112428973A - Multi-loop hydraulic cylinder body boosting mechanism

Info

Publication number: CN112428973A
Application number: CN202010368416.4A
Authority: CN
Inventors: 郑迎; 王汝辉
Original assignee: Shanghai Huizhong Automotive Manufacturing Co Ltd
Current assignee: DIAS Automotive Electronic Systems Co Ltd
Priority date: 2020-04-30
Filing date: 2020-04-30
Publication date: 2021-03-02

Abstract

The invention provides a multi-loop hydraulic cylinder body power-assisted mechanism, which comprises: the liquid storage tank is arranged at the top of the valve block, and a plurality of oil ducts for connecting all parts are arranged in the valve block; the series double-cavity main cylinder is arranged in the valve block in a penetrating way; the motor and the controller are respectively arranged on the left side and the right side of the valve block and are mutually connected, the controller is used for receiving and transmitting signals to the motor, and the braking pressure source is connected with the motor and is used for providing wheel cylinder pressure during normal braking; the check valve is pressed on the valve block, the upper end of the check valve is close to the outlet of the liquid storage tank, and the side end of the check valve is close to the oil way outlet in the valve block; the separating valve and the isolating valve are pressed in the corresponding oil passages in the valve block. The multi-loop hydraulic cylinder body boosting mechanism can meet the requirement of a vehicle body stability control system on the flow of brake fluid during active work through the one-way valve and the arrangement mode of the one-way valve, and can meet the requirement of the pressure difference of two loops.

Description

Multi-loop hydraulic cylinder body boosting mechanism

Technical Field

The invention relates to the field of automobiles, in particular to a multi-loop hydraulic cylinder body power assisting mechanism.

Background

With the increasing popularization of new energy automobiles and automatic driving, the traditional vacuum power-assisted brake cannot be applied to electric vehicles and is gradually eliminated. The electric service brake can be perfectly matched with a new energy vehicle, and can support the realization of an automatic driving function in the future, so the electric service brake is a development trend.

When the electric service brake booster works in the vehicle body stability control system, enough brake fluid required by the electric service brake booster needs to be supplied out through the brake fluid pipeline. Because various electromagnetic valves are used in the electric service brake booster, the aperture of the electromagnetic valve is not enough to meet the requirement of a vehicle body stability control system on the flow of brake fluid, thereby influencing the function and performance of the vehicle body stability control system and bringing certain potential safety hazard to the whole vehicle.

In the prior art, electric service brake boosters typically employ spring loading (simulators) to simulate the brake pedal feel of conventional vacuum boosting, and the pedal feel simulated by existing products on the market can present the problem of sudden changes in pedal force when a large stiffness spring is acting. And a strong impact sound is emitted when the pedal is rapidly returned.

In view of the above, those skilled in the art will appreciate that the above-described technical problems can be overcome by improving the structure of the electric service brake booster.

Disclosure of Invention

The invention aims to overcome the defects that an electric service brake booster in the prior art cannot meet the requirements and the function and the performance of a vehicle body stability control system are influenced, and provides a multi-loop hydraulic cylinder body boosting mechanism.

The technical problem that the vehicle body stability control system requires the flow of the brake fluid is solved through the following technical scheme:

the utility model provides a multiloop hydraulic cylinder body assist drive device which characterized in that, multiloop pneumatic cylinder assist drive device includes:

the liquid storage tank is arranged at the top of the valve block, and a plurality of oil ducts for connecting all parts are arranged in the valve block;

the series double-cavity main cylinder penetrates through the valve block;

the brake system comprises a motor, a controller and a brake pressure source, wherein the motor and the controller are respectively arranged on the left side and the right side of the valve block and are mutually connected, the controller is used for receiving and transmitting signals to the motor, and the brake pressure source is connected with the motor and is used for providing wheel cylinder pressure during normal braking;

the check valves are pressed on the valve block, the upper ends of the check valves are close to the outlet of the liquid storage tank, and the side ends of the check valves are close to the oil way outlet in the valve block;

the separating valves are pressed at the corresponding oil passages in the valve block;

the isolating valves are pressed at corresponding oil passages in the valve block;

when the multi-loop hydraulic cylinder body boosting mechanism does not act and the vehicle body stability control system works actively, brake fluid enters the brake loop from the liquid storage tank through the separating valve and the one-way valve respectively, and the brake fluid is supplied to the vehicle body stability control system.

According to one embodiment of the invention, the one-way valve comprises a valve seat, a valve core and a valve spring, wherein a limiting boss is arranged in the valve block, the valve seat is riveted on the valve block, the lower end part of the valve spring is arranged in the valve block and is positioned on the outer ring of the limiting boss, the upper end part of the valve spring is connected with one end of the valve core, and the other end of the valve core is arranged in the valve seat;

when the valve core moves downwards, the limiting boss limits the displacement of the valve core.

According to one embodiment of the invention, the valve spring is a conical spring.

According to one embodiment of the invention, the multi-circuit hydraulic cylinder boosting mechanism further comprises a simulator disposed at the bottom of the valve block.

According to one embodiment of the invention, the simulator comprises a piston, a tail end rubber, a first spring, a mandril, a first spring seat, a second spring and an end cover, wherein the lower end part of the mandril is arranged on the end cover;

the piston is positioned above the ejector rod, and the tail end rubber is embedded in the lower end part of the piston and is abutted against the first spring.

According to one embodiment of the invention, the piston in the simulator is installed in a simulator cavity of the valve block, the simulator cavity comprises a front cavity and a rear cavity, and an oil return passage is arranged between the rear cavity and an oil pot opening in the valve block.

According to one embodiment of the invention, the simulator further comprises a plurality of leather cups and a plurality of transition rubbers, the leather cups are arranged on the peripheral wall of the piston, and the transition rubbers are embedded on the upper surface of the end cover and positioned between the end cover and the first spring seat.

According to one embodiment of the invention, the tandem double-cavity master cylinder comprises a push rod, a buffer spring and a buffer piece, wherein the buffer piece is arranged on the push rod, and the buffer spring is arranged in the buffer piece and sleeved on the push rod.

According to one embodiment of the invention, the tandem double-cavity master cylinder further comprises a first cavity and a second cavity, and the first cavity and the second cavity are respectively communicated with the oil outlet of the liquid storage tank and the separation valve.

According to an embodiment of the present invention, the valve block is provided with a first fluid inlet and a second fluid inlet, grooves are provided at the first fluid inlet and the second fluid inlet, and the fluid in the brake pressure source flows into the first fluid inlet and the second fluid inlet after passing through the grooves, and then flows into the block valve.

According to one embodiment of the invention, the recess is a crescent-shaped recess.

According to one embodiment of the invention, a lead screw of the braking pressure source is fixed on a hollow shaft of the motor, a lead screw buffer mechanism is arranged on the lead screw, and the lead screw buffer mechanism is positioned between the lead screw and the hollow shaft.

According to one embodiment of the invention, the multi-loop hydraulic cylinder block boosting mechanism further comprises a plug connector, wherein the plug connector is arranged in the valve block in a penetrating mode, one end of the plug connector is plugged with the motor, and the other end of the plug connector is plugged with the controller.

According to one embodiment of the invention, two ends of the plug connector are respectively provided with a rubber ring, and the plug connector is a separable plug connector.

The positive progress effects of the invention are as follows:

by improving the structure of the multi-loop hydraulic cylinder power-assisted mechanism, when the power-assisted mechanism does not act and a vehicle body stability control system works actively, brake fluid enters a brake loop from a liquid storage tank through a separating valve and a one-way valve respectively and is provided for the vehicle body stability control system. The check valve and the arrangement mode thereof can meet the requirement of the vehicle body stability control system on the flow of brake fluid during active work and meet the requirement of the pressure difference of two loops.

The multi-loop hydraulic cylinder body boosting mechanism is simple in structure and convenient to operate, can meet the flow requirement of a vehicle body stability control system on brake fluid, and improves the use experience and safety of users.

Drawings

The above and other features, properties and advantages of the present invention will become more apparent from the following description of the embodiments with reference to the accompanying drawings in which like reference numerals denote like features throughout the several views, wherein:

FIG. 1 is a perspective view of a multi-circuit hydraulic cylinder assist mechanism of the present invention.

FIG. 2 is a cross-sectional view of the multi-circuit hydraulic cylinder assist mechanism of the present invention taken longitudinally.

Fig. 3 is an enlarged schematic view of a portion a in fig. 2.

FIG. 4 is a schematic diagram of the arrangement of the pistons of the simulator in the multi-circuit hydraulic cylinder assist mechanism of the present invention.

FIG. 5 is a schematic diagram of the connection operation of the braking pressure source and the motor in the multi-circuit hydraulic cylinder boosting mechanism of the invention.

FIG. 6 is a schematic view showing the flow direction of fluid between the brake pressure source and the valve block in the multi-circuit hydraulic cylinder assist mechanism of the present invention.

Fig. 7 is an enlarged perspective view of a portion B of fig. 6.

FIG. 8 is a schematic view of the installation of the motor and the lead screw of the braking pressure source in the multi-circuit hydraulic cylinder boosting mechanism of the present invention.

FIG. 9 is a schematic diagram of the connection between the motor and the controller in the multi-circuit hydraulic cylinder boosting mechanism of the present invention.

[ reference numerals ]

Liquid storage tank 10

Valve block 20

Tandem dual chamber master cylinder 30

Motor 40

Controller 50

Brake pressure source 60

One-way valve 70

Separating valve 80

Valve seat 71

Valve core 72

Valve spring 73

Limit boss 74

Outlet 11 of the liquid storage tank

Oil passage outlet 12

Simulator 90

Piston 91

End rubber 92

First spring 93

Top rod 94

First spring seat 95

Second spring 96

End cap 97

Leather cup 98

Transition rubber 99

Push rod 31

Buffer spring 32

Buffer member 33

First cavity 34

Second cavity 35

Simulator chamber 350

Front cavity 351

Rear chamber 352

Oil pot mouth 21

Oil return passage 22

Screw 61

Pump housing 62

Piston 63 in pump housing

Outlet flow passage 64

First liquid stream inlet 22

Second liquid inflow port 23

Groove a

Hollow shaft 41

Lead screw buffer mechanism 611

Bearing 42

Nut 421

Motor casing 43

Motor rear cover 44

O-ring 45

Plug-in connector 100

Rubber ring 110

Pedal interface flange 200

Isolating valve 300

Diagnostic valve 400

Analog valve 500

Pressure sensor 600

Detailed Description

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

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.

Further, although the terms used in the present invention are selected from publicly known and used terms, some of the terms mentioned in the description of the present invention may be selected by the applicant at his or her discretion, the detailed meanings of which are described in relevant parts of the description herein.

Furthermore, it is required that the present invention is understood, not simply by the actual terms used but by the meaning of each term lying within.

FIG. 1 is a perspective view of a multi-circuit hydraulic cylinder assist mechanism of the present invention. FIG. 2 is a cross-sectional view of the multi-circuit hydraulic cylinder assist mechanism of the present invention taken longitudinally. Fig. 3 is an enlarged schematic view of a portion a in fig. 2.

As shown in fig. 1 to 3, the present invention discloses a multi-circuit hydraulic cylinder boosting mechanism, which comprises: a reservoir tank 10, a valve block 20, a tandem dual chamber master cylinder 30, an electric motor 40, a controller 50, a brake pressure source 60, a plurality of check valves 70, a plurality of isolation valves 80, and a block valve 300. The liquid storage tank 10 is mounted on the top of the valve block 20, and a plurality of oil passages for connecting various components are arranged in the valve block 20. The tandem dual-chamber master cylinder 30 is inserted into the valve block 20, the motor 40 and the controller 50 are respectively installed at the left and right sides of the valve block 20 and are connected with each other, the controller 50 is used for receiving and transmitting signals to the motor 40, and the brake pressure source 60 is connected with the motor 40 and is used for providing wheel cylinder pressure during normal braking. The check valve 70 is press-fitted on the valve block 20, and the upper end of the check valve 70 is adjacent to the outlet of the reservoir tank 10, and the side end is adjacent to the outlet of the oil passage in the valve block 20. The separation valve 80 and the block valve 300 are press-fitted at the corresponding oil passages in the valve block 20. In addition, the multi-circuit hydraulic cylinder boosting mechanism further comprises a plurality of coils, and the coils are installed and fixed on the controller 50.

When the multi-loop hydraulic cylinder boosting mechanism does not act and the vehicle body stability control system actively works, brake fluid enters the brake loop from the liquid storage tank 10 through the separation valve 80 and the one-way valve 70 respectively, and is supplied to the vehicle body stability control system.

As shown in fig. 3, preferably, the check valve 70 includes a valve seat 71, a valve core 72 and a valve spring 73, a limit boss 74 is provided in the valve block 20, the valve seat is riveted on the valve block, a lower end portion of the valve spring 73 is installed in the valve block 20 and located at an outer ring of the limit boss 74, an upper end portion of the valve spring 73 is connected to one end of the valve core 72, and the other end of the valve core 72 is installed in the valve seat 71. The valve spring 73 may here preferably be a conical spring. When the valve core 72 moves downward, the limit boss 74 limits the displacement of the valve core 72, thereby controlling the displacement of the valve core 72.

More specifically, the check valve 70 is an assembly structure, and is installed at an oil pot opening of the valve block 20, the valve seat 71 is riveted on the valve block 20, the valve core 72 adopts a rubber-coated structure, one end of the valve core penetrates through a center hole of the valve seat 71, the other end of the valve core is connected with an inner ring at the small end of the valve spring 73 in an interference manner, an outer ring at the large end of the valve spring 73 is connected with an outer ring of a check valve hole on the valve block 20 in an interference manner, and the valve spring 73 adopts a conical spring structure.

When the vehicle body stability control system works actively, brake fluid enters a brake loop from the liquid storage tank 10 through the separating valve 80 and the one-way valve 70 respectively and is provided for the vehicle body stability control system, the mechanism is characterized in that the upper end of the one-way valve 70 is close to the outlet 11 of the liquid storage tank 10, and the side of the one-way valve 70 is close to the oil path outlet 12, and the arrangement mode enables the path of the brake fluid passing through the one-way valve 70 from the liquid storage tank 10 to the oil path outlet 12 to be shortest and the pressure drop to be minimum. In this embodiment, two sets of check valves 70 are provided, which are arranged in the same manner, so that the two circuit brake fluid paths are the same and the pressure drops are the same. The check valve 70 and the arrangement mode thereof can meet the requirement of the vehicle body stability control system on the flow of brake fluid during active work and meet the requirement of the pressure difference of two loops. Wherein, the limiting boss 74 in the check valve 70 ensures that the valve spring 73 is not excessively compressed, and the valve spring 73 takes the form of a conical spring, ensuring the stability thereof.

Further preferably, the multi-circuit hydraulic cylinder boosting mechanism further comprises a simulator 90, and the simulator 90 is arranged at the bottom of the valve block 20.

As shown in fig. 2, the simulator 90 includes a piston 91, a terminal rubber 92, a first spring 93, a top rod 94, a first spring seat 95, a second spring 96, and an end cover 97, wherein a lower end portion of the top rod 94 is mounted on the end cover 97, the second spring 96 is sleeved on the lower end portion of the top rod 94, the first spring seat 95 is sleeved on an outer portion of the second spring 96, and the first spring 93 is mounted on the first spring seat 95. The piston 91 is located above the ram 94, and the end rubber 92 is embedded in the lower end portion of the piston 91 and abuts against the first spring 93.

Further, the simulator 90 further includes a cup 98 and a transition rubber 99, the cup 98 is disposed on the outer peripheral wall of the piston 91, and the transition rubber 99 is embedded on the upper surface of the end cover 97 and located between the end cover 97 and the first spring seat 95.

In this embodiment, the specific working process of the simulator 90 is as follows: the pedal is stepped on, brake fluid in the series double-cavity master cylinder 30 is pushed out, enters the simulator 90 through the simulation valve 500, and due to the sealing effect of the leather cup 98, the piston 91 and the leather cup 98 move downwards together to compress the second spring 96, so that the first spring seat 95 contacts the transition rubber 99, the transition rubber 99 is compressed, the first spring seat 95 is in rigid contact with the end cover 97, the first spring 93 is compressed (under the other condition, due to the setting of a force value, the first spring 93 has a certain compression amount before), the ejector rod 94 contacts the tail end rubber 92, and the tail end rubber 92 is compressed until limiting. In this process, in particular, the transition rubber 99 achieves a smooth pedal force transition between the second spring 96 and the first spring 93 in the transition phase of operation.

Preferably, the tandem dual chamber master cylinder 30 includes a push rod 31, a cushion spring 32 and a cushion member 33, the cushion member 33 is installed on the push rod 31, and the cushion spring 32 is installed in the cushion member 33, which is sleeved on the push rod 31. Due to the structural arrangement, the tandem double-cavity master cylinder 30 can effectively relieve the impact of the pedal during quick return particularly by the buffer spring 32 and the buffer 33 in the working process, so that the impact sound is reduced.

The tandem dual-chamber master cylinder 30 further comprises a first chamber 34 and a second chamber 35, and the first chamber 34 and the second chamber 35 are respectively communicated with the oil outlet of the liquid storage tank 10 and the separation valve 80. FIG. 4 is a schematic diagram of the arrangement of the pistons of the simulator in the multi-circuit hydraulic cylinder assist mechanism of the present invention.

As shown in fig. 4, the simulator chamber 350 of the valve block 20 includes a front chamber 351 and a rear chamber 352, the other side of the valve block 20 is provided with an oil pot port 21, and an oil return passage 22 is provided between the rear chamber 352 and the oil pot port 21.

In particular, for the simulator 90 mounted on the valve block 20, after the sealing failure of the piston cup 98 of the simulator is considered, the brake fluid will leak to the rear cavity 352 through the cup 98, so that the front cavity 351 and the rear cavity 352 are filled with the brake fluid, and after the driver steps on the pedal, the brake fluid in the rear cavity 352 cannot be discharged, which may result in no pedal stepping, affect the pedal feeling and bring corresponding safety hazards, so that the oil return channel 22 (as shown in fig. 4) is added in the valve block 20, and the brake fluid in the rear cavity 352 flows into the reservoir port 21 through the oil return channel 22.

FIG. 5 is a schematic diagram of the connection operation of the braking pressure source and the motor in the multi-circuit hydraulic cylinder boosting mechanism of the invention. FIG. 6 is a schematic view showing the flow direction of fluid between the brake pressure source and the valve block in the multi-circuit hydraulic cylinder assist mechanism of the present invention. Fig. 7 is an enlarged perspective view of a portion B of fig. 6.

As shown in fig. 5, for the brake pressure source 60, the screw 61 of the brake pressure source 60 driven by the motor 40 pushes the piston 63 installed in the pump housing 62 to push out the brake fluid from the outlet channel 64 on the pump housing 62.

As shown in fig. 6 and 7, the valve block 20 is provided with a first fluid inlet 22 and a second fluid inlet 23, the first fluid inlet 22 and the second fluid inlet 23 are provided with a groove a, and the fluid in the brake pressure source 60 flows into the first fluid inlet 22 and the second fluid inlet 23 through the groove a and then flows into the block valve 300. Preferably, the groove a may be provided as a crescent groove.

In particular, the brake fluid, which is rapidly pushed out from the outlet channel 64 of the pump housing 62, needs to enter the first fluid inlet 22 and the second fluid inlet 23 of the valve block 20 (i.e., HB1), and pressure shock is generated, so that the crescent-shaped groove a is increased. The brake fluid flowing therethrough smoothly merges from the first fluid inlet port 22 and the second fluid inlet port 23 by the guide of the crescent groove (i.e., the valley a), and flows into the block valve 300.

A plurality of outlet channels 64 are radially distributed on the pump housing 62 of the brake pressure source 60, and when the screw pushes the piston to advance, the brake fluid in the brake pressure source 60 flows into the groove a and then flows into the first fluid inlet 22 or the second fluid inlet 23.

As shown in fig. 8, a lead screw 61 of the brake pressure source 60 is fixed to the hollow shaft 41 of the motor 40, a lead screw buffer mechanism 611 is provided on the lead screw 61, and the lead screw buffer mechanism 611 is located between the lead screw 61 and the hollow shaft 41.

For the installation of the motor 40 and the lead screw 61, at the rear end of the motor, the hollow shaft 41 is in interference fit with the inner ring of the bearing 42, the outer ring of the bearing 42 is installed on the motor shell 43 in a clearance mode, and the end face is locked by a clamp spring. The screw 61 is fixed on the hollow shaft 41 through a nut 421, the motor rear cover 44 is press-fitted on the motor housing 43 with interference, and the O-ring 45 is used for sealing.

Particularly, a lead screw buffering structure 611 is added in the structure and is formed by combining disc springs, and when the lead screw returns quickly, the functions of buffering, shock absorption and noise reduction can be achieved.

As shown in fig. 9, the multi-circuit hydraulic cylinder boosting mechanism further includes a plug 100, the plug 100 is inserted into the valve block 20, one end of the plug 100 is inserted into the motor 40, and the other end is inserted into the controller 50. Further, a rubber ring 110 is installed at each end of the socket connector 100.

In the structure herein, since the motor 40 and the controller 50 are disposed at both sides of the valve block 20, a motor signal line needs to pass through the valve block 20 to be connected to the controller 50 (i.e., ECU). Therefore, the embodiment introduces a two-end plugging mode, which is convenient and quick, reduces the traditional welding steps, and adds a rubber ring 110 at each of the two ends of the pin of the connector, thereby playing the roles of eliminating the gap and buffering.

According to the structural description, the multi-loop hydraulic cylinder body power assisting mechanism mainly comprises a liquid storage tank 10, a motor 40, a controller 50, a valve block 20, a simulator 90 and a pedal interface flange 200. The motor 40 and the controller 50 are positioned at two sides of the valve block 20, so that electromagnetic interference between components is effectively prevented, and the space at the connector of the controller 50 meets the requirement and is convenient to operate. In particular, the pedal interface flange 200 is of a detachable design and can be modified according to the interfaces of vehicle models of different manufacturers. The simulator 90 is an independent module, and can be designed according to the requirements of different vehicle models of different manufacturers on pedal feeling.

The reservoir 10 can be fixed on the valve block 20 by selecting a screw, the valve seat 71 in the one-way valve 79 is pressed on the valve block 20, and the braking pressure source 8 is mainly used for providing the wheel cylinder pressure during normal braking. The simulator 90 is a separate stand-alone design. In addition, the separation valve 80, the block valve 300, the diagnostic valve 400, and the analog valve 500 are respectively press-fitted at the respective oil passages of the valve block 20 at different oil passage arrangement points. Two pressure sensors 600 are provided at the pressure source outlet and the master cylinder chamber for increasing the safety feature of the product.

The multi-loop hydraulic cylinder body power-assisted mechanism can work in the following three modes:

the first mode is as follows: in the normal booster mode, when the driver depresses the brake pedal, the separation valve 80 is closed to block the connection of the tandem dual-chamber master cylinder 30 with the brake circuit, and the brake fluid discharged from the tandem dual-chamber master cylinder 30 enters the simulator 90 through the simulation valve 500. In synchronization, the controller 50 detects the driver's braking demand via the pedal displacement sensor, coordinates the motor to provide boost, and provides brake fluid pressure from the brake pressure source 60, through the block valve 300, into the brake circuit, and into the wheel cylinders.

And a second mode: a mechanical backup mode that is entered when a power loss or other failure occurs. When the driver depresses the brake pedal, the simulation valve 500 is closed, the block valve 300 is closed, and the brake fluid discharged from the tandem double-chamber master cylinder 30 enters the brake circuit via the separation valve 80 and flows into the wheel cylinder.

And a third mode: active boost mode, such as autonomous driving. Upon receiving an external braking request, the partition valve 80 is closed to block the connection of the tandem dual-chamber master cylinder 30 to the brake circuit, and the brake fluid is supplied from the brake pressure source 60, enters the brake circuit via the block valve 300, and flows into the wheel cylinders.

In summary, the multi-loop hydraulic cylinder power-assisted mechanism of the invention has an improved structure, so that when the power-assisted mechanism is not operated and the vehicle body stability control system is actively working, brake fluid enters the brake loop from the liquid storage tank through the separating valve and the one-way valve respectively, and is provided for the vehicle body stability control system. The check valve and the arrangement mode thereof can meet the requirement of the vehicle body stability control system on the flow of brake fluid during active work and meet the requirement of the pressure difference of two loops.

The multi-loop hydraulic cylinder body boosting mechanism is simple in structure and convenient to operate, can meet the flow requirement of a vehicle body stability control system on brake fluid, and improves the use experience of safety users.

While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that these are by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.

Claims

1. The utility model provides a multiloop hydraulic cylinder body assist drive device which characterized in that, multiloop pneumatic cylinder assist drive device includes:

the series double-cavity main cylinder penetrates through the valve block;

2. The multi-circuit hydraulic cylinder boosting mechanism according to claim 1, wherein the check valve comprises a valve seat, a valve core and a valve spring, a limit boss is arranged in the valve block, the valve seat is riveted on the valve block, the lower end part of the valve spring is arranged in the valve block and positioned at the outer ring of the limit boss, the upper end part of the valve spring is connected with one end of the valve core, and the other end of the valve core is arranged in the valve seat;

3. The multi-circuit hydraulic cylinder assist mechanism of claim 2, wherein the valve spring is a conical spring.

4. The multi-circuit hydraulic cylinder assist mechanism of claim 1, further comprising a simulator disposed at a bottom of the valve block.

5. The multi-circuit hydraulic cylinder boosting mechanism according to claim 4, wherein the simulator comprises a piston, a tail end rubber, a first spring, a top rod, a first spring seat, a second spring and an end cover, wherein the lower end part of the top rod is mounted on the end cover, the second spring is sleeved on the lower end part of the top rod, the first spring seat is sleeved outside the second spring, and the first spring is mounted on the first spring seat;

6. The multi-circuit hydraulic cylinder boosting mechanism according to claim 5, wherein said piston of said simulator is installed in a simulator cavity of said valve block, said simulator cavity comprises a front cavity and a rear cavity, and an oil return passage is provided between said rear cavity and an oil feeding port of said valve block.

7. The multi-circuit hydraulic cylinder assist mechanism of claim 5, wherein the simulator further comprises a plurality of cups and a plurality of transition rubbers, the cups being disposed on the outer peripheral wall of the piston, the transition rubbers being embedded in the upper surface of the end cap between the end cap and the first spring seat.

8. The multi-circuit hydraulic cylinder boosting mechanism according to claim 1, wherein said series dual-chamber main cylinder comprises a push rod, a buffer spring and a buffer member, said buffer member is mounted on said push rod, said buffer spring is mounted in said buffer member, and said buffer spring is sleeved on said push rod.

9. The multi-circuit hydraulic cylinder boosting mechanism according to claim 8, wherein said tandem dual chamber master cylinder further comprises a first chamber and a second chamber, said first chamber and said second chamber being respectively communicated with an oil outlet of said liquid storage tank and a separation valve.

10. The multi-circuit hydraulic cylinder assist mechanism as set forth in claim 1, wherein said valve block is provided with a first fluid inlet and a second fluid inlet, said first fluid inlet and said second fluid inlet being provided with a groove, and fluid in said brake pressure source flows through said groove into said first fluid inlet and said second fluid inlet and then into said block valve.

11. The multi-circuit hydraulic cylinder assist mechanism of claim 10, wherein the groove is a crescent-shaped groove.

12. The multi-circuit hydraulic cylinder boosting mechanism according to claim 1, wherein a lead screw of the braking pressure source is fixed on a hollow shaft of the motor, a lead screw buffering mechanism is arranged on the lead screw, and the lead screw buffering mechanism is located between the lead screw and the hollow shaft.

13. The multi-circuit hydraulic cylinder boosting mechanism according to claim 1, further comprising a plug connector, wherein the plug connector is inserted into the valve block, one end of the plug connector is connected with the motor, and the other end of the plug connector is connected with the controller.

14. The multi-circuit hydraulic cylinder assist mechanism of claim 13, wherein a rubber ring is mounted at each end of the plug connector, and the plug connector is a separable plug connector.