CN110386121B - Hydraulic power-assisted brake pressure regulating system for vehicle - Google Patents
Hydraulic power-assisted brake pressure regulating system for vehicle Download PDFInfo
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- CN110386121B CN110386121B CN201810350656.4A CN201810350656A CN110386121B CN 110386121 B CN110386121 B CN 110386121B CN 201810350656 A CN201810350656 A CN 201810350656A CN 110386121 B CN110386121 B CN 110386121B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/12—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/12—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid
- B60T13/22—Brakes applied by springs or weights and released hydraulically
Abstract
The invention provides a hydraulic power-assisted brake pressure regulating system for a vehicle, which comprises a shell, wherein a hollow accommodating space is arranged in the middle of the shell, a plurality of holes are formed in the surface of the shell, and the holes are communicated with the accommodating space; at present, with the great popularization of new energy vehicles and hybrid vehicles, the power device of the vehicle cannot provide a vacuum environment for a vacuum booster, and therefore, a hydraulic power-assisted braking system is gradually developed due to the advantages of high energy density, timely response, high power-assisted ratio and the like.
Description
Technical Field
The invention relates to the field of braking of motor vehicles, in particular to a hydraulic power-assisted brake pressure regulating system for a vehicle.
Background
At present, the braking systems of motor vehicles are mainly vacuum-assisted braking systems. When the brake pedal is depressed, the control force of the pedal mechanism pushes the control valve of the vacuum booster to cause air to enter the vacuum servo air chamber. Along with the air filling, pressure difference appears on two sides of the vacuum servo air chamber membrane to generate thrust, and the thrust and pedal force directly act on a brake main cylinder circuit to generate pressure, so that the pressure output by the brake main cylinder is multiplied. If the vacuum booster fails or the vacuum pipeline has no vacuum degree, the pedal mechanism directly pushes the control valve, the vacuum servo air chamber diaphragm and the brake master cylinder push rod through the vacuum booster, and the brake master cylinder can generate braking force. However, in this case, the force acting on the master cylinder is not increased as compared with the force acting on the pedal mechanism.
In the field of brake systems for construction machines, hydraulic brake systems also exist. This type of brake system does not rely on the operating force of the brake pedal mechanism to cause the brake device to generate a braking force, but relies on high-pressure fluid supplied from a dedicated hydraulic pump to cause the brake device to generate a braking force. In this type of brake system, the brake pedal mechanism is merely used as a pressure regulator for pressure regulation of high-pressure fluid, and does not directly provide braking thrust to the master cylinder push rod. Upon loss of high pressure fluid to provide braking, the mechanism will completely lose the ability to actively brake upon application of this type of braking system.
As patent numbers: 201710172071.3, the hydraulic brake system has the following problems: pedal force drives a small plunger unit that produces high pressure fluid that pushes the movement of the spool. The implementation is different. And the reliability of the assembly is slightly lower due to the addition of a high-pressure liquid component for driving the valve plug.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a hydraulic power-assisted brake pressure regulating system for a vehicle, which has the advantages of timely response, large resistance ratio and capability of enabling a brake master cylinder to generate braking force through a pedal mechanism like a vacuum resistance brake system when the hydraulic resistance brake system fails.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a hydraulic power-assisted brake pressure regulating system for a vehicle, which is characterized in that: the shell is characterized by comprising a shell, wherein a hollow accommodating space is formed in the middle of the shell, a plurality of holes are formed in the surface of the shell, and the holes are communicated with the accommodating space;
the middle part of the shell also comprises a push rod, one end of the push rod penetrating through the shell extends into one end of the accommodating space and is connected with a cushion block, one end of the cushion block, which is away from the push rod, is provided with a limit ring, one end of the limit ring, which is away from the cushion block, is provided with a low-pressure valve seat limit ring, a first cavity is arranged between the limit ring and the low-pressure valve seat limit ring, and a first spring is arranged in the first cavity;
a low-pressure valve seat is arranged at one end of the low-pressure valve seat limiting ring away from the first spring, a high-pressure valve seat is arranged at one end of the low-pressure valve seat away from the low-pressure valve seat limiting ring at intervals, a second cavity is arranged between the low-pressure valve seat and the high-pressure valve seat, a second spring is arranged in the second cavity,
a guide sleeve is arranged at one end, away from the second spring, of the high-pressure valve seat, a blocking cover is arranged at one end, away from the high-pressure valve seat, of the guide sleeve, a third chamber is arranged between the guide sleeve and the blocking cover, a third spring is arranged in the third chamber, and a clamp spring is arranged at one end, away from the guide sleeve, of the blocking cover;
one end of the shell, which is away from the push rod, is connected with a brake master cylinder;
a valve core is arranged between the low-pressure valve seat and the guide sleeve, and a fifth chamber is arranged between the valve core and the low-pressure valve seat;
a first valve port is arranged between the valve core and the low-pressure valve seat, and a second valve port is arranged between the valve core and the high-pressure valve seat.
Furthermore, a valve sleeve is sleeved in the accommodating space, and a cushion block, a limiting ring, a first chamber, a low-pressure valve seat limiting ring, a low-pressure valve seat, a second chamber, a high-pressure valve seat, a guide sleeve and a blocking cover are arranged in the valve sleeve; the clamp spring is in contact with the blocking cover and the inner wall of the valve sleeve; one end of the valve sleeve, which is adjacent to the push rod, is connected with the piston, and the push rod penetrates through the piston.
Further, the holes comprise a first hole, the first hole is communicated with a fourth cavity, the fourth cavity is communicated with a second hole, and the second hole is communicated with the third cavity;
the second chamber can be communicated with the fifth chamber, the second chamber is communicated with a third hole, the third hole is communicated with a sixth chamber, the sixth chamber is communicated with a fourth hole, and the fourth hole is communicated with a seventh chamber; the fifth cavity is communicated with the fifth hole, the fifth hole is communicated with the first cavity, the first cavity is communicated with the sixth hole, the sixth hole is communicated with the eighth cavity, the eighth cavity is communicated with the seventh hole, and the seventh hole is communicated with the oil can.
Further, first hole sets up on the casing, the fourth cavity sets up the outer wall of valve barrel with between the inner wall of accommodation space, the second hole sets up on the valve barrel, third hole sets up on the valve barrel, the sixth cavity sets up the outer wall of valve barrel with between the inner wall of accommodation space, the fourth hole sets up in the wall of casing, the seventh cavity sets up between the inner wall of accommodation space and the piston, the fifth hole sets up the middle part of low pressure disk seat, the sixth hole sets up on the valve barrel, the eighth cavity sets up the outer wall of valve barrel with between the inner wall of accommodation space, the seventh hole sets up on the casing.
Further, the case includes the connecting rod, the middle part cover of connecting rod has the guide ring that can let high-pressure liquid circulate, the pot head of connecting rod has the low-pressure valve steel ball, the other pot head of connecting rod has the high-pressure valve steel ball, the low-pressure valve steel ball with the setting that opens and shuts of low pressure disk seat, the high-pressure valve steel ball with the setting that opens and shuts of high pressure disk seat.
Further, S1, initial state
The boosted high-pressure liquid enters the fourth chamber through the first hole and then enters the third chamber through the second hole, the second valve port is in a closed state under the action of the valve core, the third spring and the high-pressure liquid in the third chamber, and meanwhile, the first valve port is in an open state due to the resultant force of the second spring and the second spring on the low-pressure valve seat;
s2, in the supercharging state
When the push rod is subjected to thrust in a first direction, the cushion block and the limiting ring are pushed to move along the first direction, then the first spring and the low-pressure valve seat limiting ring are pushed to move along the first direction, the thrust in the first direction is transmitted to the low-pressure valve seat, and when the thrust in the first direction is greater than the tension of the second spring, the first valve port is gradually closed;
when the pushing force along the first direction is gradually increased, the second valve port is gradually opened after the pushing force along the first direction is larger than the sum of the tension of the second spring, the tension of the third spring and the acting force of the high-pressure liquid in the third chamber;
after the second valve port is opened, high-pressure liquid in the third chamber flows to the second chamber through the second valve port, the high-pressure liquid in the second chamber enters the sixth chamber through the third hole and then enters the seventh chamber through the fourth hole, under the combined action of the high-pressure liquid in the seventh chamber and an external force applied to the push rod along the first direction, the piston pushes the valve sleeve to move along the first direction, and the valve sleeve moving along the first direction pushes the piston in the brake master cylinder;
s3, at equilibrium state
When the pressure of the liquid in the second chamber is gradually increased, hydraulic thrust along the second direction is applied to the low-pressure valve seat, and when the thrust transmitted to the low-pressure valve seat in the first direction and the thrust in the second direction by the push rod are balanced, the second valve port is closed, and at the moment, the first valve port and the second valve port are both in a closed state;
s4, when the pressure is reduced
After the push rod 1 receives the reduction of the thrust applied in the first direction, the first valve port is gradually opened, and the high-pressure liquid in the second chamber passes through the fifth chamber and the fifth hole from the first valve port to reach the first chamber, then passes through the sixth hole, the eighth chamber and the seventh hole, finally flows out of the shell of the resistor and returns to the oil can;
after the hydraulic pressure of the seventh chamber is reduced, the piston in the brake master cylinder enables the valve sleeve and the piston to reset along the second direction under the action of the reset spring.
Further, when in a failure state, the seventh chamber is not boosted by high-pressure liquid, and the valve sleeve is directly driven to displace towards the first direction by the thrust of the push rod.
And in a failure state, the brake under the failure of the booster can be ensured. The safety of the automobile is ensured.
The invention has the beneficial effects that: at present, with the great popularization of new energy vehicles and hybrid vehicles, the power device of the vehicle cannot provide a vacuum environment for a vacuum booster, and therefore, a hydraulic power-assisted braking system is gradually developed due to the advantages of high energy density, timely response, high power-assisted ratio and the like.
When the hydraulic power-assisted brake system fails, the motor vehicle applying the invention can also enable the brake master cylinder to generate braking force through the pedal mechanism like the vacuum power-assisted brake system fails. Unlike conventional hydraulically assisted brake systems, a motor vehicle will completely lose its ability to actively brake upon loss of high pressure fluid to provide braking.
1) The brake force of the pedal is transmitted to a brake actuating element through a piston after passing through the fluid pressure and the action force of a spring, and can synchronously react with the hydraulic brake assistance;
2) the pedal braking force generates a control braking force adjusting device through a piston device, a valve core is directly opened by foot force, and then high-pressure fluid is introduced to assist in driving; 3) the valve core is directly opened by foot force, then high-pressure fluid is introduced to assist driving, and the pressure of hydraulic brake assistance is adjusted by controlling the opening and closing of two one-way valves, namely the valve core.
Drawings
FIG. 1 is a schematic view of the initial state structure of the present invention;
FIG. 2 is a schematic view of the structure of the booster of the present invention;
FIG. 3 is a schematic diagram of the equilibrium state of the present invention;
FIG. 4 is a schematic structural view of the valve cartridge;
1. a housing; 101. a push rod; 6. cushion blocks; 7. a limiting ring; 8. a first spring; 9. a low pressure valve seat limiting ring; 306. a first chamber; 10. a low pressure valve seat; 13. a high pressure valve seat; 303. a second chamber; 17. a second spring; 14. a guide sleeve; 15. blocking the cover; 302. a third chamber; 16. a third spring; 401. a clamp spring; 4. a brake master cylinder; 12. a valve core; 305. a fifth chamber; 501. a first valve port; 502. a second valve port; 11. a valve housing; 5. a piston; 201. a first hole; 301. a fourth chamber; 202. a second hole; 203. a third hole; 304. a sixth chamber; 204. a fourth hole; 308. a seventh chamber; 207. a fifth hole; 205. a sixth hole; 206. a seventh hole; 307. an eighth chamber; x, a first direction; y, second direction.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention is suitable for the hydraulic brake system of the motor vehicle, and is a hydraulic power-assisted brake pressure regulating device with high practicability.
A hydraulic power-assisted brake pressure regulating system for a vehicle comprises a shell 1, wherein a hollow accommodating space is arranged in the middle of the shell 1, a plurality of holes are formed in the surface of the shell 1, and the holes are communicated with the accommodating space;
the middle part of the shell 1 further comprises a push rod 101, one end of the push rod 101, penetrating through the shell 1, extends into one end of the accommodating space and is connected with a cushion block 6, one end, away from the push rod 101, of the cushion block 6 is provided with a limiting ring 7, one end, away from the cushion block 6, of the limiting ring 7 is provided with a low-pressure valve seat limiting ring 9, a first cavity 306 is arranged between the limiting ring 7 and the low-pressure valve seat limiting ring 9, and a first spring 8 is arranged in the first cavity 306;
wherein, the accommodating space is arranged in the middle of the shell 1, and the push rod 101 is arranged in the middle of the accommodating space.
A low pressure valve seat 10 is arranged at one end of the low pressure valve seat limiting ring 9, which is away from the first spring 8, a high pressure valve seat 13 is arranged at one end of the low pressure valve seat 10, which is away from the low pressure valve seat limiting ring 9, at an interval, a second chamber 303 is arranged between the low pressure valve seat 10 and the high pressure valve seat 13, a second spring 17 is arranged in the second chamber 303,
a guide sleeve 14 is arranged at one end, away from the second spring 17, of the high-pressure valve seat 13, a blocking cover 15 is arranged at one end, away from the high-pressure valve seat 13, of the guide sleeve 14, a third chamber 302 is arranged between the guide sleeve 14 and the blocking cover 15, a third spring 16 is arranged in the third chamber 302, and a clamp spring 401 is arranged at one end, away from the guide sleeve 14, of the blocking cover 15;
one end of the shell 1, which is away from the push rod 101, is connected with a brake master cylinder 4;
a valve core 12 is arranged between the low pressure valve seat 10 and the guide sleeve 14, and a fifth chamber 305 is arranged between the valve core 12 and the low pressure valve seat 10;
a first valve port 501 is arranged between the valve element 12 and the low pressure valve seat 10, and a second valve port 502 is arranged between the valve element 12 and the high pressure valve seat 13.
A valve sleeve 11 is sleeved in the accommodating space, and a cushion block 6, a limiting ring 7, a first chamber 306, a low-pressure valve seat limiting ring 9, a low-pressure valve seat 10, a second chamber 303, a high-pressure valve seat 13, a guide sleeve 14 and a blocking cover 15 are arranged in the valve sleeve 11; the clamp spring 401 is in contact with the blocking cover 15 and the inner wall of the valve housing 11; one end of valve housing 11 adjacent to push rod 101 is connected to piston 5, and push rod 101 passes through piston 5.
The push rod 101 moves along the first direction x, the cushion block 6 and the limit ring 7 are pushed by the push rod 101 to move along the first direction x, the first spring 8 is compressed to push the low-pressure valve seat limit ring 9 and the low-pressure valve seat 10 to move along the first direction x, the low-pressure valve seat 10 moves along the first direction x to be in contact with the low-pressure valve steel ball 123 of the valve element 12, namely the first valve port 501 is closed, and the fifth chamber 305 between the low-pressure valve seat 10 and the valve element 12 is continuously reduced and is in a closed state.
When the push rod 101 continues to be pushed by the first direction x, the second spring 7 is compressed, the valve core 12 is pushed by the first direction x, and moves along the first direction x, and the second valve port 502 is gradually opened.
The guide sleeve 14 moves along the first direction x, and the third spring 16 is pushed to move along the first direction x, but the guide sleeve 14 is in a static state due to the high-pressure liquid arranged at the rear end of the guide sleeve 14 and the force of the guide sleeve 14 and the third spring 16 towards the first direction x can be overcome.
The high pressure fluid in seventh chamber 308 forces piston 5 to move in first direction x and piston 5 forces valve housing 11 to move in first direction x.
The holes comprise a first hole 201, the first hole 201 is communicated with a fourth cavity 301, the fourth cavity 301 is communicated with a second hole 202, and the second hole 202 is communicated with a third cavity 302;
the second chamber 303 is communicated with the fifth chamber 305, the second chamber 303 is communicated with the third hole 203, the third hole 203 is communicated with the sixth chamber 304, the sixth chamber 304 is communicated with the fourth hole 204, and the fourth hole 204 is communicated with the seventh chamber 308; the fifth cavity 305 is communicated with the fifth hole 207, the fifth hole 207 is communicated with the first cavity 306, the first cavity 306 is communicated with the sixth hole 205, the sixth hole 205 is communicated with the eighth cavity 307, the eighth cavity 307 is communicated with the seventh hole 206, and the seventh hole 206 is communicated with the oil can.
The push rod 101, the piston 5 and the valve sleeve 11 are pushed to move by the circulation of high-pressure liquid in the chamber. High-pressure liquid braking is adopted, so that the reaction is rapid and synchronous.
Referring to fig. 4, the valve core 12 includes a connecting rod 121, a guide ring 122 for allowing high-pressure liquid to flow is sleeved at the middle of the connecting rod 121, a low-pressure valve steel ball 123 is sleeved at one end of the connecting rod 121, a high-pressure valve steel ball 124 is sleeved at the other end of the connecting rod 121, the low-pressure valve steel ball 123 is opened and closed with the low-pressure valve seat 10, and the high-pressure valve steel ball 124 is opened and closed with the high-pressure valve seat 13.
The two ends of the valve core 12 are spherical, and are matched with the low pressure valve seat 10 and the high pressure valve seat 13, so that the opening and closing of the first valve port 501 and the second valve port 502 can be controlled. The guide ring 122 is provided in the middle to allow the high pressure liquid to flow.
1. In the initial state, please refer to fig. 1,
the boosted high-pressure liquid enters the fourth chamber 301 through the first hole 201 and then enters the third chamber 302 through the second hole 202, the second valve port 502 is in a closed state under the action of the high-pressure liquid in the valve core 12, the third spring 16 and the third chamber 302, and meanwhile, the first valve port 501 is in an open state due to the combined force of the second spring 17 and the first spring 8 applied to the low-pressure valve seat 10;
s2, in the pressurized state, please refer to fig. 2,
when the push rod 101 is subjected to a pushing force applied to a first direction x, the cushion block 6 and the limiting ring 7 are pushed to move along the first direction x, then the first spring 8 and the low-pressure valve seat limiting ring 9 are pushed to move along the first direction x, the pushing force of the first direction x is transmitted to the low-pressure valve seat 10, and when the pushing force along the first direction x is greater than the tension of the second spring 17, the first valve port 501 is gradually closed;
when the pushing force along the first direction x is gradually increased, the second valve port 502 is gradually opened after the pushing force along the first direction x is larger than the sum of the tension of the second spring 17, the tension of the third spring 16 and the acting force of the high-pressure liquid in the third chamber 302;
after the second valve port 502 is opened, the high-pressure fluid in the third chamber 302 flows to the second chamber 303 through the second valve port 502, the high-pressure fluid in the second chamber 303 enters the sixth chamber 304 through the third aperture 203 and then enters the seventh chamber 308 through the fourth aperture 204, under the combined action of the high-pressure fluid in the seventh chamber 308 and the external force applied to the push rod 101 along the first direction x, the piston 5 pushes the valve sleeve 11 to move along the first direction x, and the valve sleeve 11 moving along the first direction x pushes the piston in the master cylinder 4;
s3, in the state of equilibrium, please refer to fig. 3,
when the pressure of the liquid in the second chamber 303 gradually increases, a hydraulic thrust along the second direction y will be applied to the low pressure valve seat 10, and when the thrust in the first direction x, which is transmitted to the low pressure valve seat 10 by the push rod 101, and the thrust in the second direction y reach a balance, the second valve port 502 will be closed, and at this time, both the first valve port 501 and the second valve port 502 are in a closed state;
s4, when the pressure is reduced
After the push rod 101 receives a reduced pushing force applied in the first direction x, the first valve port 501 is gradually opened, and the high-pressure liquid in the second chamber 303 passes through the fifth chamber 305, the fifth hole 207 from the first valve port 501 to the first chamber 306, then passes through the sixth hole 205, the eighth chamber 307 and the seventh hole 206, and finally flows out of the housing 1 of the resistor and returns to the oil pot;
when the hydraulic pressure in the seventh chamber 308 is reduced, the piston in the master cylinder 4 returns the valve sleeve 11 and the piston 5 in the second direction y under the action of the return spring.
In the event of a failure condition, the seventh chamber 308 is filled with fluid under high pressure, without assistance, and the thrust of the push rod 101 directly drives the displacement of the valve housing 11 in the first direction x.
The above-mentioned embodiments only express the embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (4)
1. A hydraulic power-assisted brake pressure regulating system for a vehicle, characterized in that: the portable air conditioner comprises a shell (1), wherein a hollow accommodating space is formed in the middle of the shell (1), a plurality of holes are formed in the surface of the shell (1), and the holes are communicated with the accommodating space;
the middle part of the shell (1) further comprises a push rod (101), one end, penetrating through the shell (1), of the push rod (101) extends into one end of the accommodating space and is connected with a cushion block (6), one end, away from the push rod (101), of the cushion block (6) is provided with a limiting ring (7), one end, away from the cushion block (6), of the limiting ring (7) is provided with a low-pressure valve seat limiting ring (9), a first cavity (306) is arranged between the limiting ring (7) and the low-pressure valve seat limiting ring (9), and a first spring (8) is arranged in the first cavity (306);
a low-pressure valve seat (10) is arranged at one end, away from the first spring (8), of the low-pressure valve seat limiting ring (9), a high-pressure valve seat (13) is arranged at one end, away from the low-pressure valve seat limiting ring (9), of the low-pressure valve seat (10) at an interval, a second chamber (303) is arranged between the low-pressure valve seat (10) and the high-pressure valve seat (13), a second spring (17) is arranged in the second chamber (303),
a guide sleeve (14) is arranged at one end, away from the second spring (17), of the high-pressure valve seat (13), a blocking cover (15) is arranged at one end, away from the high-pressure valve seat (13), of the guide sleeve (14), a third chamber (302) is arranged between the guide sleeve (14) and the blocking cover (15), a third spring (16) is arranged in the third chamber (302), and a clamp spring (401) is arranged at one end, away from the guide sleeve (14), of the blocking cover (15);
one end of the shell (1), which is away from the push rod (101), is connected with a brake master cylinder (4);
a valve core (12) is arranged between the low-pressure valve seat (10) and the guide sleeve (14), and a fifth chamber (305) is arranged between the valve core (12) and the low-pressure valve seat (10);
a first valve port (501) is arranged between the valve core (12) and the low-pressure valve seat (10), and a second valve port (502) is arranged between the valve core (12) and the high-pressure valve seat (13);
a valve sleeve (11) is sleeved in the accommodating space, and a cushion block (6), a limiting ring (7), a first chamber (306), a low-pressure valve seat limiting ring (9), a low-pressure valve seat (10), a second chamber (303), a high-pressure valve seat (13), a guide sleeve (14) and a blocking cover (15) are arranged in the valve sleeve (11); the clamp spring (401) is in contact with the blocking cover (15) and the inner wall of the valve sleeve (11); one end of the valve sleeve (11), which is adjacent to the push rod (101), is connected with the piston (5), and the push rod (101) penetrates through the piston (5);
the holes comprise a first hole (201), the first hole (201) is communicated with a fourth chamber (301), the fourth chamber (301) is communicated with a second hole (202), and the second hole (202) is communicated with the third chamber (302);
the second chamber (303) can be communicated with the fifth chamber (305), the second chamber (303) is communicated with a third hole (203), the third hole (203) is communicated with a sixth chamber (304), the sixth chamber (304) is communicated with a fourth hole (204), and the fourth hole (204) is communicated with a seventh chamber (308); the fifth cavity (305) is communicated with a fifth hole (207), the fifth hole (207) is communicated with the first cavity (306), the first cavity (306) is communicated with a sixth hole (205), the sixth hole (205) is communicated with an eighth cavity (307), the eighth cavity (307) is communicated with a seventh hole (206), and the seventh hole (206) is communicated with an oil pot;
the first hole (201) is arranged on the shell (1), the fourth cavity (301) is arranged between the outer wall of the valve sleeve (11) and the inner wall of the accommodating space, the second hole (202) is arranged on the valve sleeve (11), the third hole (203) is arranged on the valve sleeve (11), the sixth cavity (304) is arranged between the outer wall of the valve sleeve (11) and the inner wall of the accommodating space, the fourth hole (204) is arranged in the wall of the shell (1), the seventh cavity (308) is arranged between the inner wall of the accommodating space and the piston (5), the fifth hole (207) is arranged in the middle of the low-pressure valve seat (10), the sixth hole (205) is arranged on the valve sleeve (11), and the eighth cavity (307) is arranged between the outer wall of the valve sleeve (11) and the inner wall of the accommodating space, the seventh hole (206) is arranged on the shell (1).
2. A hydraulic power assisted brake pressure regulating system for a vehicle according to claim 1, characterized in that: the valve core (12) comprises a connecting rod (121), a guide ring (122) capable of allowing high-pressure liquid to flow is sleeved at the middle of the connecting rod (121), a low-pressure valve steel ball (123) is sleeved at one end of the connecting rod (121), a high-pressure valve steel ball (124) is sleeved at the other end of the connecting rod (121), the low-pressure valve steel ball (123) is opened and closed with the low-pressure valve seat (10), and the high-pressure valve steel ball (124) is opened and closed with the high-pressure valve seat (13).
3. A hydraulic power assisted brake pressure regulating system for a vehicle according to claim 2, characterized in that:
s1, initial state
The boosted high-pressure liquid enters the fourth chamber (301) through the first hole (201) and then enters the third chamber (302) through the second hole (202), the second valve port (502) is in a closed state under the action of the valve core (12), the third spring (16) and the high-pressure liquid in the third chamber (302), and meanwhile, the first valve port (501) is in an open state due to the combined force of the second spring (17) and the first spring (8) applied to the low-pressure valve seat (10);
s2, in the supercharging state
When the push rod (101) is subjected to thrust applied to a first direction (x), the cushion block (6) and the limiting ring (7) are pushed to move along the first direction (x), then the first spring (8) and the low-pressure valve seat limiting ring (9) are pushed to move along the first direction (x), the thrust of the first direction (x) is transmitted to the low-pressure valve seat (10), and when the thrust of the first direction (x) is greater than the tension of the second spring (17), the first valve port (501) is gradually closed;
when the pushing force along the first direction (x) is gradually increased, the second valve port (502) is gradually opened after the pushing force along the first direction (x) is larger than the sum of the tension of the second spring (17), the tension of the third spring (16) and the acting force of the high-pressure liquid in the third chamber (302);
after the second valve port (502) is opened, high-pressure liquid in the third chamber (302) flows to the second chamber (303) through the second valve port (502), the high-pressure liquid in the second chamber (303) enters the sixth chamber (304) through the third hole (203) and then enters the seventh chamber (308) through the fourth hole (204), under the combined action of the high-pressure liquid in the seventh chamber (308) and an external force applied to the push rod (101) along the first direction (x), the piston (5) pushes the valve sleeve (11) to move along the first direction (x), and the valve sleeve (11) moving along the first direction (x) pushes a piston in a brake master cylinder (4);
s3, at equilibrium state
When the pressure of the liquid in the second chamber (303) is gradually increased, a hydraulic thrust along the second direction (y) is applied to the low-pressure valve seat (10), and when the thrust in the first direction (x) and the thrust in the second direction (y) transmitted to the low-pressure valve seat (10) by the push rod (101) are balanced, the second valve port (502) is closed, and at the same time, the first valve port (501) and the second valve port (502) are both in a closed state;
s4, when the pressure is reduced
After the push rod (101) is subjected to a reduction of the pushing force applied in the first direction (x), the first valve port (501) is gradually opened, and the high-pressure liquid in the second chamber (303) passes through the first valve port (501), the fifth chamber (305), the fifth hole (207) to reach the first chamber (306), then passes through the sixth hole (205), the eighth chamber (307) and the seventh hole (206), and finally flows out of the housing (1) of the resistor and returns to the oil can;
after the hydraulic pressure of the seventh chamber (308) is reduced, the piston in the brake master cylinder (4) enables the valve sleeve (11) and the piston (5) to reset along the second direction (y) under the action of a reset spring.
4. A hydraulic power assisted brake pressure regulating system for a vehicle according to claim 3, characterized in that: in the event of a failure condition, the seventh chamber (308) is free of boosted high pressure fluid, and the valve housing (11) is directly driven by the thrust of the push rod (101) to displace in the first direction (x).
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| CN201810350656.4A CN110386121B (en) | 2018-04-18 | 2018-04-18 | Hydraulic power-assisted brake pressure regulating system for vehicle |
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| CN201810350656.4A CN110386121B (en) | 2018-04-18 | 2018-04-18 | Hydraulic power-assisted brake pressure regulating system for vehicle |
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| CN110386121B true CN110386121B (en) | 2021-05-11 |
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| CN110386121A (en) | 2019-10-29 |
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