CN108482352B - Hydraulic power assisting system - Google Patents
Hydraulic power assisting system Download PDFInfo
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- CN108482352B CN108482352B CN201810493841.9A CN201810493841A CN108482352B CN 108482352 B CN108482352 B CN 108482352B CN 201810493841 A CN201810493841 A CN 201810493841A CN 108482352 B CN108482352 B CN 108482352B
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- 239000012530 fluid Substances 0.000 claims abstract description 34
- 239000007788 liquid Substances 0.000 claims description 50
- 238000007789 sealing Methods 0.000 claims description 35
- 210000001503 joint Anatomy 0.000 claims description 5
- 230000001154 acute effect Effects 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 2
- 238000011161 development Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
Classifications
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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
- B60T13/14—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 using accumulators or reservoirs fed by pumps
- B60T13/142—Systems with master cylinder
- B60T13/145—Master cylinder integrated or hydraulically coupled with booster
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Braking Systems And Boosters (AREA)
- Transmission Of Braking Force In Braking Systems (AREA)
Abstract
The invention provides a hydraulic power assisting system, which comprises a cylinder body filled with brake fluid, wherein a first piston assembly, a guide seat, a second piston assembly and a third piston are sequentially arranged from a cylinder opening to a cylinder bottom of the cylinder body, and the cylinder body is internally divided into a first pressure cavity, a second pressure cavity and two main cylinders; the second piston assembly is internally provided with a second piston filled with the inner cavity of brake fluid and a T-shaped push rod, the T-shaped push rod extends into the first pressure cavity from the inner cavity of the second piston, the center of the T-shaped push rod is provided with a through hole communicated with the first pressure cavity, and a passage is arranged in the wall of the second piston, so that the inner cavity is communicated with the second pressure cavity. The invention does not use an electromagnetic valve, and only uses the mechanical structure and the hydraulic pressure of the electromagnetic valve to realize the functions of quickly building and releasing pressure under the hydraulic power assistance and failure modes.
Description
Technical Field
The invention relates to the field of automobile brake booster systems, in particular to a hydraulic booster system.
Background
With the development of automobile technology, automobile driving safety is increasingly emphasized, and a traditional braking system realizes braking by amplifying the braking force of a driver through a vacuum booster. Vacuum assistance requires the engine to provide a vacuum source, and for electric vehicles or new energy vehicles, a vacuum pump is also required to be installed. With the development of technology, electronic hydraulic brake boosters are continuously developed by various manufacturers, so that the braking of automobiles is no longer dependent on an engine or a vacuum pump, and the brake-by-wire can be realized.
For development and manufacture of the electro-hydraulic brake booster, it is considered that when the electro-hydraulic brake fails, the electro-hydraulic brake booster can be directly switched to hydraulic brake to maintain normal operation of the brake system. Because the product is provided with the hydraulic pedal simulator for simulating pedal feel of the traditional vacuum booster, the opening and closing of the hydraulic channel are generally controlled by using the electromagnetic valve, and the hydraulic pressure in the pedal simulator is released when the electronic brake fails, so that the resistance when a driver steps on the hydraulic brake when the electronic brake fails is reduced.
Chinese patent 201110289573.7 (application date: 2011, 6, 27, publication date: 2012, 6, 20, CN 102501841) discloses a steering unit for a hydraulic brake system and an operating method thereof, which discloses a steering unit for a hydraulic brake system including a brake pressure generator and a pressure control device for adjusting the pressure in a steering chamber of the brake pressure generator, wherein the pressure control device is hydraulically connected to the brake pressure generator, and has at least one first switching valve and at least one first regulating valve, with which the pressure is built up in the steering chamber, and also has at least one second switching valve and at least one second regulating valve, with which the pressure in the steering chamber is relieved. The pressure control device for adjusting the pressure in the control chamber can be used for building the braking force of the automobile and relieving the pressure by using the second regulating valve, but a large number of electromagnetic valves are used in the patent, and the electromagnetic valves are difficult to manufacture in China and have high price, so that how to develop a hydraulic power assisting structure which has no electromagnetic valve and can meet the functions is a technical problem to be solved by a person skilled in the art.
Disclosure of Invention
The invention provides a hydraulic power assisting system which does not use an electromagnetic valve, and only meets the functions of quickly building up and releasing pressure under the hydraulic power assisting and failure modes by means of the mechanical structure and the hydraulic pressure of the hydraulic power assisting system, so that the problems are solved.
In order to achieve the above purpose, the invention provides a hydraulic power assisting system, which comprises a cylinder body filled with brake fluid, wherein the cylinder body is sequentially provided with a first piston assembly, a guide seat, a second piston assembly and a third piston from a cylinder opening to a cylinder bottom, and the space in the cylinder body is divided into a first pressure cavity between the first piston assembly and the guide seat, a second pressure cavity between the guide seat and the second piston assembly and communicated with a liquid storage tank, and a first main cylinder cavity between the second piston assembly and the third piston and a second main cylinder cavity between the third piston and the cylinder bottom;
the first piston assembly is in contact with a brake pedal, and the first main cylinder cavity and the second main cylinder cavity are connected with a brake system and drive the brake system;
the second piston assembly comprises a second piston with an inner cavity filled with brake fluid and a T-shaped push rod, the T-shaped push rod sequentially penetrates through the second piston wall, the guide seat and the first pressure cavity along the length direction of the cylinder body from the second piston inner cavity, a through hole penetrating through the T-shaped push rod to enable the inner cavity to be communicated with the first pressure cavity is formed in the center of the T-shaped push rod, and a driving unit used for enabling liquid in the liquid storage tank to flow into the second pressure cavity is connected in series between the second pressure cavity and the liquid storage tank;
And a passage is arranged in the second piston wall, so that the inner cavity is communicated with the second pressure cavity, the T-shaped push rod is covered on the opening of the passage to block the passage, and when the T-shaped push rod leaves the opening of the passage, the inner cavity is in communication with the second pressure cavity.
Preferably, a piston inner column is arranged in the inner cavity of the second piston, the piston inner column extends from a second piston wall far away from the T-shaped push rod to the T-shaped push rod, a cross groove communicated with the inner cavity is formed in the end part close to the T-shaped push rod, the cross groove is perpendicular to the length direction of the cylinder body, and the through hole of the T-shaped push rod corresponds to the cross groove in position.
Preferably, a first spring is arranged in the first pressure cavity along the length direction of the cylinder body, the first spring is positioned between the guide seat and the first piston assembly, a second spring sleeved on the inner piston column is arranged in the second piston cavity, and one end of the second spring is in contact with the second piston wall, and the other end of the second spring is in contact with the T-shaped push rod.
Preferably, the through hole extends along the length direction of the cylinder body, at least two inner holes which are mutually communicated are formed in the end part, contacted with the T-shaped push rod, of the first piston assembly, one inner hole corresponds to the through hole of the T-shaped push rod in position, a central inner hole is defined, when the first piston assembly is contacted with the T-shaped push rod, the through hole is in butt joint with the central inner hole, and brake fluid sequentially passes through the rest inner holes and the central inner hole to enter the through hole.
Preferably, the first piston assembly comprises a first piston and a spring seat which are in contact with each other, an input push rod is arranged between the first piston and the brake pedal, the input push rod is in contact with the brake pedal, and the inner hole is formed in the end part of the spring seat.
Preferably, the spring seat has a concave cavity facing the T-shaped push rod, the bottom of the concave cavity extends towards the direction of the T-shaped push rod to form a spring base convex column, the end face of the spring base convex column is provided with an inner hole, the length of the central inner hole is parallel to the length direction of the cylinder body, and the rest of inner holes are symmetrically distributed around the central inner hole and form acute angles with the central inner hole.
Preferably, the opening of the second piston wall covered by the shoulders of the T-shaped push rod is provided with a valve block, the shoulders of the T-shaped push rod are in contact with the switch of the valve block, when the shoulders of the T-shaped push rod leave the valve block, the valve block is in an open state, and when the shoulders of the T-shaped push rod are in contact with the valve block, the valve block is in a closed state.
Preferably, a first sealing ring is sleeved outside the first piston assembly, an accommodating ring groove for accommodating the first sealing ring is formed in the inner wall of the cylinder body, the width of the accommodating ring groove is larger than that of the first sealing ring, a liquid path hole communicated with the liquid storage tank is formed in the accommodating ring groove, when the first piston assembly moves along the length direction of the cylinder body, the first sealing ring moves to the liquid path hole and seals the liquid path hole, and when the first piston assembly moves continuously, the groove wall of the accommodating ring groove blocks the first sealing ring to move continuously so that the liquid path hole still keeps a sealing state.
Preferably, the first pressure chamber is further connected to a pedal simulator located outside the cylinder, and the first master cylinder chamber and the second master cylinder chamber are both connected to the reservoir fluid path.
Preferably, a gap is formed between the second piston and the inner wall of the cylinder body, when the T-shaped push rod leaves the opening of the passage, brake fluid in the inner cavity flows into the gap through the passage, and the gap is connected with the liquid passage of the driving unit.
Compared with the prior art, the invention has the beneficial effects that: the hydraulic power-assisted system provided by the invention comprises a cylinder body filled with brake fluid, and is characterized in that a first piston assembly, a guide seat, a second piston assembly and a third piston are sequentially arranged from a cylinder opening to a cylinder bottom of the cylinder body, and the space in the cylinder body is divided into a first pressure cavity between the first piston assembly and the guide seat, a second pressure cavity between the guide seat and the second piston assembly and communicated with a liquid storage tank, a first main cylinder cavity between the second piston assembly and the third piston and a second main cylinder cavity between the third piston and the cylinder bottom;
The first piston assembly is in contact with the brake pedal, the brake system is connected with the first main cylinder cavity and the second main cylinder cavity, and a driving unit for enabling liquid in the liquid storage tank to flow into the second pressure cavity is connected in series between the second pressure cavity and the liquid storage tank;
The second piston assembly is internally provided with a second piston and a T-shaped push rod which are filled with the inner cavity of the brake fluid, the T-shaped push rod sequentially penetrates through the second piston wall and the guide seat along the length direction of the cylinder body from the inner cavity of the second piston and extends into the first pressure cavity, the center of the T-shaped push rod is provided with a through hole which penetrates through the T-shaped push rod to enable the inner cavity to be communicated with the first pressure cavity, and a passage is arranged in the second piston wall to enable the inner cavity to be communicated with the second pressure cavity, so that a path is provided for the brake fluid in the first pressure cavity to flow to the second pressure cavity.
When the driving unit does not fail, the driving unit drives the liquid storage tank or the brake liquid of the driving unit to flow into the second pressure cavity, and the hydraulic pressure in the second pressure cavity drives the second piston to move towards the third piston, so that the third piston also moves when receiving the hydraulic pressure, and the brake system is driven; when the driving unit fails, the brake pedal is stepped on to enable the first piston assembly to be in contact with the T-shaped push rod, so that the T-shaped push rod is separated from the second piston wall and pushes the second piston, the hydraulic pressure in the first main cylinder cavity of the first main cylinder cavity is increased to push the third piston to move so as to drive the brake system, and after the T-shaped push rod is separated from the second piston wall, brake fluid in the first pressure cavity sequentially flows through a through hole in the T-shaped push rod, a passage of the second piston wall and a return flow into the liquid storage tank after the second pressure cavity, so that the hydraulic pressure in the first pressure cavity is released. The pressure relief mode is quick and convenient, once the T-shaped push rod leaves the second piston wall, the first pressure cavity and the second pressure cavity are communicated immediately, hydraulic energy in the first pressure cavity is released rapidly, hydraulic resistance is reduced immediately when the first piston assembly advances towards the T-shaped push rod, a braking system can be started rapidly still in a failure mode, an electromagnetic valve is not used, and the functions of hydraulic assistance and pressure relief are achieved rapidly in the failure mode only through the mechanical structure and the hydraulic pressure of the electromagnetic valve.
Drawings
FIG. 1 is a cross-sectional view of a hydraulic assist system provided by the present invention;
FIG. 2 is a schematic diagram showing the running of brake fluid in a hydraulic power assisting system in a non-failure mode provided by the invention;
FIG. 3 is a schematic diagram illustrating the running of brake fluid in a hydraulic assist system in a failure mode provided by the present invention;
fig. 4 is a schematic view of view A-A of fig. 1.
In the figure: 1-a first pressure chamber, 2-a second pressure chamber, 3-a first master cylinder chamber, 4-a second master cylinder chamber, 5-a brake system;
100-of a brake pedal, 200-of a liquid storage tank, 300-of a cylinder body, 310-of a containing ring groove, 311-of a liquid path hole and 320-of an opening;
400-first piston assembly, 410-first piston, 420-input push rod, 430-spring seat, 431-spring seat boss, 4311-inner bore, 43111-central inner bore, 440-first seal ring, 450-first spring;
500-guide seats and 510-guide seat O-shaped rings;
600-second piston assembly, 610-second piston, 611-inner piston column, 6111-cross groove, 612-second spring, 613-round hole, 614-inner cavity, 620-valve block, 630-jump ring, 640-second sealing ring, 650-third sealing ring, 660-T push rod, 661-through hole;
700-third piston, 800-drive unit, 900-pedal simulator.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings.
Referring to fig. 1 to 2, the present invention provides a hydraulic power assisting system, which includes a cylinder 300 filled with brake fluid, in this embodiment, the cylinder 300 is in a rectangular or cylindrical shape, and is disposed transversely, that is, transversely in the length direction, the cylinder 300 is sequentially provided with a first piston assembly 400, a guide seat 500, a second piston assembly 600 and a third piston 700 from a cylinder opening to a cylinder bottom, and the space in the cylinder 300 is divided into a first pressure chamber 1 located between the first piston assembly 400 and the guide seat 500, a second pressure chamber 2 located between the guide seat 500 and the second piston assembly 600 and communicated with the fluid reservoir 200, a first master cylinder chamber 3 located between the second piston assembly 600 and the third piston 700, and a second master cylinder chamber 4 located between the third piston 700 and the cylinder bottom.
Specifically, the first piston assembly 400 contacts the brake pedal 100, the first piston assembly 400 includes a first piston 410 located at a cylinder port, and a spring seat 430 closely contacting the first piston 410 and located at one side of the first piston 410 near the T-shaped push rod 660, the first piston 410 is provided with a pit facing the brake pedal 100, the pit is communicated with the outside air, and therefore no brake fluid is contained, an input push rod 420 is provided in the pit, one end of the input push rod contacts the bottom of the pit, the other end of the input push rod contacts the brake pedal 100, and when a person steps on the brake pedal 100, the brake pedal 100 pushes the input push rod 420, so that the first piston 410 is pushed to move towards the cylinder bottom; in another embodiment of the present invention, the first piston 410 is not provided with a pit, and the input push rod 420 is located between the first piston 410 and the brake pedal 100;
In still another embodiment of the present invention, the first piston 410 is further provided with a limiting device, so that the first piston 410 is limited at a certain fixed position, and the brake pedal 100 is kept fixed at a zero position;
The spring seat 430 is provided with a concave cavity facing the T-shaped push rod 660, the first spring 450 is arranged between the guide seat 500 and the bottom of the concave cavity, when the first piston 410 pushes the spring seat 430 to move towards the T-shaped push rod 660, the first spring 450 provides resistance to the spring seat 430 to prevent the spring seat 430 from contacting the T-shaped push rod 660, the bottom center of the concave cavity of the spring seat 430 extends towards the T-shaped push rod 660 to form a spring base convex column 431, the height of the spring base convex column 431 is equal to or smaller than the depth of the concave cavity, a distance larger than zero exists between the T-shaped push rod 660 and the end part of the spring base convex column 431, and the end part of the T-shaped push rod 660 cannot contact under the resistance of the first spring 450 and the hydraulic resistance in the first pressure cavity 1 in a non-failure mode;
At least two inner holes 4311 are arranged at the end part of the spring base convex column 431, three are arranged in the embodiment, five are arranged in the other embodiment, one inner hole 4311 is parallel to the length direction of the cylinder body 300, the position corresponds to the position of a through hole 661 in the T-shaped push rod 660, the position is defined as a central inner hole 43111, the rest inner holes 4311 are symmetrically distributed around the central inner hole 43111, all the inner holes 4311 are communicated, the included angle between the rest inner holes 4311 and the central inner hole 43111 is an acute angle, and after the central inner hole 43111 is in butt joint with the through hole 661 of the T-shaped push rod 660, brake fluid in the first pressure cavity 1 flows into the central inner hole 43111 through the rest inner holes 4311 and then enters the through hole 661;
The first piston assembly 400 is sleeved with a first sealing ring 440, correspondingly, a containing ring groove 310 for containing the first sealing ring 440 is arranged on the wall of the cylinder body, the width of the containing ring groove 310 is larger than that of the first sealing ring 440, so that a moving space exists in the containing ring groove 310 of the first sealing ring 440, a liquid path hole 311 is formed in the bottom or the wall of the groove of the containing ring groove 310, the liquid path hole 311 is connected with the liquid storage tank 200 in a liquid way, that is, brake liquid in the liquid storage tank 200 enters the first pressure cavity 1 through the liquid path hole 311; preferably, in order to prevent the brake fluid from leaking in the fluid passage hole 311, a fourth sealing ring is sleeved on the periphery of the first sealing ring 440;
If the distance between the liquid path hole 311 and the groove wall near one side of the T-shaped push rod 660 is smaller than the width of the first sealing ring 440, when the first piston assembly 400 is pushed towards the direction of the T-shaped push rod 660, the first sealing ring 440 is blocked by the groove wall and is positioned below the liquid path hole 311, so that the liquid path hole 311 is blocked, brake liquid is not supplemented in the first pressure cavity 1, and when the first piston assembly 400 continues to move towards the direction of the T-shaped push rod 660, the first sealing ring 440 is still blocked by the groove wall, so that the liquid path hole 311 is still in a blocking state; if the distance between the liquid path hole 311 and the groove wall at the side far away from the T-shaped push rod 660 is greater than the width of the first sealing ring 440, when the first piston assembly 400 pushes towards the T-shaped push rod 660, the liquid path hole 311 is not blocked by the first sealing ring 440, but the brake liquid in the liquid storage tank 200 can not flow into the first pressure chamber 1 after flowing through the liquid path hole 311, because of the blocking of the first sealing ring 440, the effect of not increasing the hydraulic pressure in the first pressure chamber 1 is also achieved;
The first pressure chamber 1 is also connected with the pedal simulator 900, when the driver steps on the brake pedal 100, the input push rod 420 contacted with the brake pedal 100 pushes the first piston 410 along with the brake pedal, after the first piston 410 passes through the liquid path hole 311 on the cylinder 300, the pressure is slowly built in the first pressure chamber 1, and the pressure is built in the pedal simulator 900 connected with the first pressure chamber, and meanwhile, feedback force is generated to the brake pedal 100, so that the driver is given a feedback pedal feel.
The guide holder 500 is fixed in the second pressure chamber 2, in the width direction of the cylinder 300, that is, in the direction perpendicular to the length direction of the cylinder 300, the length of the second pressure chamber 2 is greater than the length of the first pressure chamber 1 in the direction, that is, the wall thickness of the cylinder 300 of the second pressure chamber 2 is smaller than the wall thickness of the cylinder 300 at the first pressure chamber 1, the length of the guide holder 500 in the direction is smaller than or equal to the length of the second pressure chamber 2 in the direction, a guide holder clamp spring (not shown) is arranged at the position where the guide holder 500 contacts with the wall of the second pressure chamber 2, the guide holder clamp spring enables the guide holder 500 to be fixed at the position where the second pressure chamber 2 is close to the wall of the first pressure chamber 1, and in the embodiment, the width of the guide holder 500 is greater than the width of the first pressure chamber 1, so that the first pressure chamber 1 is isolated from the second pressure chamber 2;
when the T-shaped push rod 660 penetrates through the guide seat 500, a guide seat O-shaped ring 510 is arranged in the guide seat 500, the T-shaped push rod 660 is sleeved in the guide seat O-shaped ring 510, and correspondingly, a yielding space for accommodating the guide seat O-shaped ring 510 is arranged in the guide seat 500;
the opening 320 is formed in the wall of the cylinder body on the second pressure chamber 2, the opening 320 is communicated with the driving unit 800, when the brake pedal 100 is not stepped on, the driving unit 800 is communicated with the liquid storage tank 200, when the brake pedal 100 is stepped on, the driving unit 800 moves forward, and when the driving unit 800 fails, the driving unit 800 is in an initial state again, namely, the state that the brake pedal 100 is not stepped on, and at the moment, the driving unit 800 is communicated with the liquid storage tank 200.
The driving unit 800 is a hydraulic pump driven by a motor controlled by an ECU.
The second piston assembly 600 comprises a second piston 610 with an inner cavity 614 filled with brake fluid and a T-shaped push rod 660, wherein the T-shaped push rod 660 sequentially penetrates through the second piston wall, the guide seat 500 and extends into the first pressure cavity 1 from the inner cavity 614 of the second piston 610 along the length direction of the cylinder body 300, a through hole 661 penetrating through the T-shaped push rod 660 to enable the inner cavity 614 to be communicated with the first pressure cavity 1 is arranged at the center of the T-shaped push rod 660, and the through hole 661 extends along the length direction of the cylinder body 300 and is positioned corresponding to the position of the central inner hole 43111 or is coaxial with the central inner hole 43111;
A passage is arranged in the second piston wall, so that the inner cavity 614 is communicated with the second pressure cavity 2, the T-shaped push rod 660 covers the opening of the passage in a double-shoulder way so as to block the passage, and when the T-shaped push rod 660 leaves the opening of the passage, the inner cavity 614 is communicated with the second pressure cavity 2;
Specifically, a circular hole 613 is formed on the second piston wall near the guide seat 500, the circular hole 613 is communicated with the second pressure chamber 2, the diameter of the bottom of the circular hole 613 is reduced to form another hole, a circular valve block 620 is placed in the hole, a T-shaped push rod 660 passes through the hole between the valve blocks 620, a clamping spring 630 is arranged at the bottoms of the valve block 620 and the circular hole 613 in a cushioning manner, the two shoulders of the T-shaped push rod 660 are covered on the valve block 620, and a second sealing ring 640 is arranged between the two sealing rings in a cushioning manner, so that a sealing surface is formed among the T-shaped push rod 660, the second sealing ring 640 and the valve block 620; preferably, in an embodiment of the present invention, the valve block 620 is also provided with a limiting device, but will not be described herein;
The T-shaped push rod 600 contacts with the switch of the valve block 620, when the T-shaped push rod 660 leaves the valve block 620, the valve block 620 is in an open state, when the T-shaped push rod 660 contacts with the valve block 620, the valve block 620 is in a closed state, or other structures can be arranged for the function, so that the valve block 620 is opened when the T-shaped push rod 660 leaves the valve block 620, and the valve block 620 is closed when the valve block 620 is covered;
Preferably, an inner piston column 611 is disposed in the inner cavity 614 of the second piston 610, the inner piston column 611 extends from the center of the second piston wall far from the T-shaped push rod 660 to the T-shaped push rod 660, a cross groove 6111 is disposed in the end close to the T-shaped push rod 660 and is communicated with the inner cavity 614, referring to fig. 4, the cross groove 6111 is perpendicular to the length direction of the cylinder 300, the through hole 661 of the T-shaped push rod 600 is communicated with the cross groove 6111, that is, the center of the cross groove 6111 is coaxial with the central axis of the through hole 661, when the T-shaped push rod 600 contacts with the inner piston column 611, the through hole 661 is abutted with the cross groove 6111, the brake fluid in the through hole 661 flows into the cross groove 6111, so as to flow into the inner cavity 614, a second spring 612 sleeved on the inner piston column 611 is disposed in the inner cavity 614, and one end of the second spring 612 contacts with the end of the second piston wall and the shoulder of the T-shaped push rod 660, and the second spring 612 is contacted with the end of the double-shaped push rod 660 only when the T-shaped push rod 612 is not contacted with the inner piston column 660, and the inner piston column 611 is contracted with the inner piston column 660;
preferably, a third sealing ring 650 is also provided between the wall of the inner chamber 614 and the valve block 620, maintaining isolation between the inner chamber 614 and the second pressure chamber 2 in the non-failure mode;
Preferably, a gap is formed between the second piston 610 and the inner wall of the cylinder 300, which is a part of the second pressure chamber 2, and when the shoulders of the T-shaped push rod 600 leave the valve block 620, the brake fluid in the inner cavity 614 flows into the circular hole 613 through the opened valve block 620 and then enters the gap, so that the flowing speed of the brake fluid is increased, and the reaction speed of the whole system is improved.
The first master cylinder chamber 3 and the second master cylinder chamber 4 are both connected with the brake system 5, and the movement of the third piston 400 and the second piston 610 can drive the brake system 5, and the first master cylinder chamber 3 and the second master cylinder chamber 4 are both connected with the liquid tank 200 in a liquid path.
Referring to fig. 2, in the non-failure mode, the driver steps on the brake pedal 100, and the input push rod 420 connected to the brake pedal 100 pushes the first piston 410 along with it, after the first piston 410 passes through the fluid path hole 311 on the cylinder 300, the pressure is slowly built up in the first pressure chamber 1, and the pressure is built up in the pedal simulator 900 connected to the first pressure chamber, and at the same time, feedback force is applied to the brake pedal 100 to give the driver feedback pedal feel;
Because the spring seat 430 is pressed against the first piston 410 by the first spring 450, the spring seat 430 also moves along with the first piston 410, and the spring seat 430 and the T-shaped push rod 660 are not contacted due to the distance between the spring seat 430 and the T-shaped push rod 660; meanwhile, after receiving the signal of stepping on the brake pedal 100, the driving unit 800 establishes a corresponding hydraulic pressure according to the actual situation (the speed and the travel of the driver), and transmits the hydraulic pressure to the second pressure chamber 2, by the above-mentioned, the hydraulic pressure in the second pressure chamber 2 rises to push the second piston 610 to move toward the third piston 700, the T-shaped push rod 660 is located in the inner cavity 614 of the second piston 610, the second piston wall pushes the T-shaped push rod 660 to move along with the T-shaped push rod 660, and the logic control ensures that the spring seat 430 and the T-shaped push rod 660 are not touched all the time under the braking situation, the shoulders of the T-shaped push rod 660 are not separated from the valve block 620 to enable the valve block 620 to be not opened, and the first pressure chamber 1 and the second pressure chamber 2 are kept isolated all the time. Movement of the second piston 610 into the first master cylinder chamber 3 increases the hydraulic pressure of the first master cylinder chamber 3 pushing the third piston 700 and then being transferred to other elements in the external brake system 5, such as ABS/ESP/caliper, activating the brake system 5.
Sometimes, the braking of the electro-hydraulic power-assisted system directly informs the driving unit 800 of the motor operation through the external signal of the automobile instead of stepping on the brake pedal 100, and builds pressure to push the second piston 610, so as to push the third piston 700 to move to start the braking system 5 (equivalent to automatic driving), and how to directly inform the driving unit 800 of the motor operation through the external signal is not in the technical scheme of the present patent, which is not repeated herein.
Referring to fig. 3, in the failure mode, the present embodiment refers to that the driving unit 800 cannot start to build pressure due to failure, and needs to directly brake by the driver stepping on the brake pedal 100, i.e. by manpower, the smaller the resistance is, the better the resistance is, so as to meet the requirement of the regulations and ensure the safety of the driver, and the pressure is built up by the first pressure chamber 1 when the driver steps on the brake pedal 100, so that the hydraulic pressure of the first pressure chamber 1 must be released.
During braking, pedal force is transmitted to the spring seat 430 through the input push rod 420 and the first piston 410, and because the driving unit 800 is not pressurized, the second pressure chamber 2 is not pressurized at the moment, the T-shaped push rod 660 does not move towards the third piston 700, so that the gap between the spring seat 430 and the T-shaped push rod 660 is gradually reduced, hydraulic pressure is generated in the first pressure chamber 1 and the pedal simulator 900, and resistance to people is formed;
When the spring seat 430 contacts with the T-shaped push rod 660, the force is directly transmitted to the T-shaped push rod 660, at this time, the through hole 661 of the T-shaped push rod 660 is in butt joint with the central inner hole 43111 of the spring base convex column 431, and the brake fluid in the first pressure chamber 1 is kept clear with the inside of the through hole 661 of the T-shaped push rod 660 through the inner hole 4311; the pedal force is further increased, the T-shaped push rod 660 overcomes the spring force of the second spring 612, the shoulders of the T-shaped push rod 660 are separated from the valve block 620, so that the sealing surfaces formed by the shoulders of the T-shaped push rod 660, the second sealing ring 640 and the valve block 620 are opened, brake fluid in the first pressure cavity 1 flows into the inner cavity 614 through the through hole 661, and the brake fluid in the inner cavity 614 flows into the gap, namely the second pressure cavity 2, through the opened valve block 620 and the round hole 613, so that the first pressure cavity 1 and the second pressure cavity 2 are communicated; since the hydraulic pressure is present in the first pressure chamber 1 and the pedal simulator 900, the hydraulic pressure is released back to the reservoir tank 200 through the second pressure chamber 2 and the driving unit 800 through the above-formed passage, so that only the spring force and the friction force are applied to the person, the hydraulic pressure resistance is not present, the second piston 610 can be continuously pushed forward, and the hydraulic pressure starts to be generated in the first master cylinder chamber 3 and the second master cylinder chamber 4.
With the further pushing, the T-shaped push rod 660 pushes the second spring 612 so that the length of the second spring 612 is equal to that of the piston inner column 611, the T-shaped push rod 660 contacts the piston inner column 611 of the second piston 610, the through hole 661 is in butt joint with the cross groove 6111, and the brake fluid in the through hole 661 flows through the cross groove 6111 to enter the inner cavity 614, so that the extra resistance generated by the further compression of the second spring 612 is reduced as much as possible, and the cross groove 6111 shown in fig. 4 ensures that the brake fluid can be still unblocked after the T-shaped push rod 660 contacts the piston inner column 611.
When released, under the action of the spring force of the second spring 612, the T-shaped push rod 660 is pushed to cover the valve block 620 by the shoulders, and sealing surfaces are formed among the shoulders of the T-shaped push rod 660, the second sealing ring 640 and the valve block 620 to isolate the first pressure chamber 1 and the second pressure chamber 2 again.
The pressure relief mode is quick and convenient, once the T-shaped push rod 660 leaves the second piston wall, the first pressure cavity 1 and the second pressure cavity 2 are communicated immediately, the hydraulic pressure in the first pressure cavity 1 can be released rapidly, the hydraulic resistance is reduced immediately when the first piston assembly 400 advances towards the T-shaped push rod 660, the brake system 5 can still be started rapidly in a failure mode, an electromagnetic valve is not used, and the functions of hydraulic assistance and rapid pressure building and pressure relief in the failure mode are realized only by using the mechanical structure and the hydraulic pressure of the electromagnetic valve.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. The present invention is intended to include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (8)
1. The hydraulic power assisting system comprises a cylinder body filled with brake fluid, and is characterized in that the cylinder body is sequentially provided with a first piston assembly, a guide seat, a second piston assembly and a third piston from a cylinder opening to a cylinder bottom, and divides the space in the cylinder body into a first pressure cavity between the first piston assembly and the guide seat, a second pressure cavity between the guide seat and the second piston assembly and communicated with a liquid storage tank, a first main cylinder cavity between the second piston assembly and the third piston and a second main cylinder cavity between the third piston and the cylinder bottom;
the first piston assembly is in contact with a brake pedal, and the first main cylinder cavity and the second main cylinder cavity are connected with a brake system and drive the brake system;
The second piston assembly comprises a second piston with an inner cavity filled with brake fluid and a T-shaped push rod, the T-shaped push rod sequentially penetrates through a second piston wall, the guide seat and the first pressure cavity along the length direction of the cylinder body from the second piston inner cavity, a through hole penetrating through the T-shaped push rod to enable the inner cavity to be communicated with the first pressure cavity is formed in the center of the T-shaped push rod, and a driving unit for enabling liquid in the liquid storage tank to flow into the second pressure cavity is connected in series between the second pressure cavity and the liquid storage tank; the through hole extends along the length direction of the cylinder body, at least two inner holes which are communicated with each other are formed in the end part, which is contacted with the T-shaped push rod, of the first piston assembly, one inner hole corresponds to the through hole of the T-shaped push rod in position and is defined as a central inner hole, when the first piston assembly is contacted with the T-shaped push rod, the through hole is in butt joint with the central inner hole, and brake fluid sequentially passes through the rest inner holes and the central inner hole to enter the through hole;
A passage is arranged in the second piston wall, so that the inner cavity is communicated with the second pressure cavity, the T-shaped push rod is covered on the opening of the passage in a double-shoulder manner, so that the passage is blocked, and when the T-shaped push rod leaves the opening of the passage, the inner cavity is restored to be communicated with the second pressure cavity;
The inner cavity of the second piston is internally provided with a piston inner column, the piston inner column extends from a second piston wall far away from the T-shaped push rod to the T-shaped push rod, a cross groove communicated with the inner cavity is formed at the end part close to the T-shaped push rod, the cross groove is perpendicular to the length direction of the cylinder body, and the through hole of the T-shaped push rod corresponds to the cross groove in position.
2. The hydraulic booster system of claim 1, wherein a first spring is disposed in the first pressure chamber along the length of the cylinder, the first spring is disposed between the guide seat and the first piston assembly, a second spring is disposed in the second piston chamber and sleeved on the inner piston post, one end of the second spring contacts the second piston wall, and the other end of the second spring contacts the T-shaped push rod.
3. The hydraulic assist system of claim 1 wherein the first piston assembly includes a first piston and a spring seat in contact with each other, the first piston having a recess facing the brake pedal, an input pushrod disposed within the recess, the input pushrod in contact with the brake pedal, the bore opening at an end of the spring seat.
4. The hydraulic assist system as set forth in claim 3 wherein said spring seat has a cavity facing said T-shaped pushrod, said cavity bottom extending in a direction of said T-shaped pushrod to form a spring base post, said spring base post end face defining said bore, said central bore being parallel to said cylinder length direction, the remaining said bores being symmetrically disposed about and forming an acute angle with said central bore.
5. The hydraulic assist system of claim 1 wherein the passageway of the second piston wall is provided with a valve block at an opening covered by the shoulders of the T-shaped pushrod, the shoulders of the T-shaped pushrod being in contact with the switch of the valve block, the valve block being in an open condition when the shoulders of the T-shaped pushrod are clear of the valve block, the valve block being in a closed condition when the shoulders of the T-shaped pushrod are in contact with the valve block.
6. The hydraulic power assisting system as claimed in claim 1, wherein a first sealing ring is sleeved outside the first piston assembly, a containing ring groove for containing the first sealing ring is formed in the inner wall of the cylinder body, the containing ring groove is wider than the first sealing ring, a liquid path hole communicated with the liquid storage tank is formed in the containing ring groove, when the first piston assembly moves along the length direction of the cylinder body, the first sealing ring moves to the liquid path hole and seals the liquid path hole, and when the first piston assembly continues to move, the containing ring groove wall blocks the first sealing ring from continuing to move so that the liquid path hole still maintains a sealing state.
7. The hydraulic assist system of claim 1 wherein the first pressure chamber is further coupled to a pedal simulator located outside of the cylinder, the first master cylinder chamber and the second master cylinder chamber both being fluidly coupled to the reservoir.
8. The hydraulic assist system of claim 1 wherein a gap is provided between the second piston and the cylinder inner wall, the brake fluid in the interior chamber flowing through a passageway into the gap when the T-bar exits the passageway opening, the gap being in fluid communication with the drive unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810493841.9A CN108482352B (en) | 2018-05-22 | 2018-05-22 | Hydraulic power assisting system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810493841.9A CN108482352B (en) | 2018-05-22 | 2018-05-22 | Hydraulic power assisting system |
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| CN108482352A CN108482352A (en) | 2018-09-04 |
| CN108482352B true CN108482352B (en) | 2024-05-17 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61175163A (en) * | 1985-01-25 | 1986-08-06 | アルフレツド・テグエス・ゲーエムベーハー | Hydraulic brake gear |
| CN101332811A (en) * | 2007-05-21 | 2008-12-31 | 罗伯特博世有限公司 | Master cylinder comprising a seal for helping the feedback |
| WO2015177207A1 (en) * | 2014-05-20 | 2015-11-26 | Ipgate Ag | Actuating system for a vehicle brake and method of operating the actuating system |
| CN106218619A (en) * | 2016-08-30 | 2016-12-14 | 邓伟文 | A kind of electro-hydraulic servo brakes with multiple-working mode |
| CN208498464U (en) * | 2018-05-22 | 2019-02-15 | 浙江亚太机电股份有限公司上海分公司 | Hydraulic booster system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015009698A (en) * | 2013-06-28 | 2015-01-19 | 株式会社デンソー | Vehicular brake system |
-
2018
- 2018-05-22 CN CN201810493841.9A patent/CN108482352B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61175163A (en) * | 1985-01-25 | 1986-08-06 | アルフレツド・テグエス・ゲーエムベーハー | Hydraulic brake gear |
| CN101332811A (en) * | 2007-05-21 | 2008-12-31 | 罗伯特博世有限公司 | Master cylinder comprising a seal for helping the feedback |
| WO2015177207A1 (en) * | 2014-05-20 | 2015-11-26 | Ipgate Ag | Actuating system for a vehicle brake and method of operating the actuating system |
| CN106218619A (en) * | 2016-08-30 | 2016-12-14 | 邓伟文 | A kind of electro-hydraulic servo brakes with multiple-working mode |
| CN208498464U (en) * | 2018-05-22 | 2019-02-15 | 浙江亚太机电股份有限公司上海分公司 | Hydraulic booster system |
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| CN108482352A (en) | 2018-09-04 |
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Effective date of registration: 20240418 Address after: 311200, No. 1399 Asia Pacific Road, Shushan street, Xiaoshan District, Zhejiang, Hangzhou Applicant after: ZHEJIANG ASIA-PACIFIC MECHANICAL&ELECTRONIC Co.,Ltd. Country or region after: China Address before: No. 40, Lane 156, Changji Road, Anting Town, Jiading District, Shanghai, May 2018 Applicant before: SHANGHAI BRANCH OF ZHEJIANG ASIA-PACIFIC MECHNICAL & ELECTRONIC CO.,LTD. Country or region before: China |
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