CN111071226A

CN111071226A - Wheel hub braking system of new energy vehicle

Info

Publication number: CN111071226A
Application number: CN201911347445.6A
Authority: CN
Inventors: 郑利霞
Original assignee: BEIJING INFORMATION TECHNOLOGY COLLEGE
Current assignee: BEIJING INFORMATION TECHNOLOGY COLLEGE
Priority date: 2019-12-24
Filing date: 2019-12-24
Publication date: 2020-04-28
Anticipated expiration: 2039-12-24
Also published as: CN111071226B

Abstract

The invention relates to the technical field of automobile braking, and discloses a hub braking system of a new energy vehicle, which comprises a shell, wherein one end of the shell is fixedly connected with a vacuum tube, the hub braking system of the new energy vehicle is characterized in that a second feedback disk is arranged to be convex, one end of an air valve is contacted with the inside of a groove of the second feedback disk, and the other end of the second feedback disk is contacted with a first feedback disk, so that the thickness of the feedback disk in the moving direction of a push rod of a booster is increased, a gap between the air valve and the feedback disk can be filled better, the gap generated in the advancing and retreating processes of the push rod of the booster tends to be consistent, the pressure lag is reduced, the traditional contact between a control valve body and the first feedback disk is changed into the contact boosting of the second feedback disk and the first feedback disk, and the area of a protruded part is smaller than the area of one end of the air valve, the boosting ratio generated by single braking is increased, so that the braking is easier.

Description

Wheel hub braking system of new energy vehicle

Technical Field

The invention relates to the technical field of automobile braking, in particular to a hub braking system of a new energy vehicle.

Background

The booster is mainly used for enlargiing the power of driver on brake pedal in the wheel hub braking system of vehicle, realizes lighter braking effect, and vacuum booster generally is located between brake pedal and the brake master cylinder, and its theory of operation is mainly that the pressure differential of the preceding back chamber that realizes in the vacuum booster that opens and shuts of control vacuum valve and air valve realizes the effect of helping hand, but current vacuum booster has some problems all the time:

1. the feedback dish of current vacuum booster is installed in the bowl dress seat of master cylinder ejector pin one side, the metal wall laminating of left side and side, right side and briquetting and air valve contact, when the right side of feedback dish levels, whole vacuum booster just is in balanced state, can continuous and stable helping hand, but the feedback dish among the current vacuum booster all only one, and its thickness is thinner, like this after long-time the use, after the feedback dish slowly loses its elastic action, will lead to vacuum booster to lose stable state gradually, lead to after the driver steps on brake pedal, because vacuum booster's unable stability leads to continuously increasing the helping hand, thereby produce the phenomenon of emergency braking, seriously influence driver's driving sense and safety problem.

2. The existing vacuum booster has a pressure lag phenomenon, which is caused by that on one hand, the feedback discs in the existing booster are all thin and single, a certain gap exists between an air valve and the feedback discs, and a jump value reflects the output force generated when the feedback discs fill the gap after being stressed and deformed, and the gap generated in the advancing and retreating processes of a push rod of the booster generates pressure lag, on the other hand, the push rod of the existing booster is directly connected with the air valve through a push rod, and particularly, when a driver meets an emergency situation, the braking force generated by hard pedaling on the push rod of the booster cannot be buffered only by a push rod return spring, so that the advancing speed of the push rod is too fast to generate an excessive pressure lag phenomenon, and the pedal feel generated by the pedaling of the driver and the foot feel fed back to the driver during the pedal retreating are different And seriously influences the judgment of the driver.

Disclosure of Invention

The invention provides a hub braking system of a new energy vehicle, which has the advantages of small pressure lag and higher safety and solves the problems in the background technology.

The invention provides the following technical scheme: a wheel hub braking system of a new energy vehicle comprises a shell, wherein one end of the shell is fixedly connected with a vacuum tube, the middle of the inner wall of the shell is fixedly provided with a rear shell sealing ring, the inner side of the rear shell sealing ring is movably provided with a power-assisted piston body, one end of the power-assisted piston body is fixedly provided with a membrane lining plate, the membrane lining plate and one side close to the vacuum tube form a front cavity, the other side of the membrane lining plate and the back cavity form a back cavity, one side of the membrane lining plate close to the power-assisted piston body is provided with a membrane which is positioned on one side of the power-assisted piston body and is attached to the inner wall of the front cavity of the shell and is attached to the membrane lining plate, the other side of the membrane lining plate is movably provided with a piston body reset spring, the power-, the air passage spacer ring is fixedly provided with a first buckle by an inner ring at one end of the diaphragm lining plate, the air passage spacer ring is fixedly provided with a second buckle by an outer ring at one end of the diaphragm lining plate, the end of the boosting piston body, which is contacted with the air passage spacer ring, is provided with a clamping groove, the inside of the boosting piston body is fixedly provided with a limiting ring positioned at one side of the passage sealing ring, which is far away from the diaphragm lining plate, the inside of one end of the boosting piston body is fixedly provided with an outer ring spacer body, the inside of the outer ring spacer body is fixedly provided with a C-shaped groove with a notch facing the air passage spacer ring, the C-shaped groove is positioned at one end of the vacuum tube and fixedly provided with a main cylinder ejector rod, the other end of the C-shaped groove is fixedly connected with a first feedback disc, one side of the first feedback disc, the utility model discloses a pneumatic buffer, including air valve, baffle, valve body, valve rod, outer loop spacer, one side swing joint that the air valve is inside to be located the sealing washer has first helping hand pole, the one end fixed mounting of first helping hand pole has the cushion cylinder, the inside one end activity of being connected by first helping hand pole and air valve of cushion cylinder is equipped with speed reduction spring, speed reduction spring keeps away from the one end activity of first helping hand pole and is equipped with the spacer, the spacer is located the one end fixedly connected with second helping hand pole of opposite face, the outside of cushion cylinder is equipped with the spacing collar, the activity in the cushion cylinder outside is equipped with the valve body reset spring who leans on air valve one side, one side swing joint that the outer loop spacer is located the opposite end of main cylinder ejector pin has pole reset spring.

Preferably, the diameter of the outer ring of the second feedback disc is smaller than that of the outer ring of the first feedback disc, and the cross-sectional shape of the second feedback disc is convex, and the convex surface faces the first feedback disc.

Preferably, the length of the spare feedback spring is smaller than the length of the second feedback disc after the second feedback disc is normally compressed, and the spare feedback spring does not deform when the second feedback disc normally works.

Preferably, the bayonet socket anastomotic with first buckle is seted up to one side that air valve and air flue spacer ring contacted, the inside of second buckle joint and draw-in groove, first buckle, second buckle and draw-in groove are the annular.

Preferably, the spacer and the second boosting rod are both located in the buffering cylinder and form a buffering constant-speed structure of the second boosting rod together with the speed reducing spring and the safety short rod.

The invention has the following beneficial effects:

1. the wheel hub brake system of the new energy vehicle changes a single feedback disc into a double-layer one, and a standby feedback spring is arranged on the outer side of a second feedback disc, so that when the feedback disc loses original elasticity after being used for a long time, a driver can normally compress the second feedback disc through the transmission of a push rod of a booster after stepping on a brake pedal, a control valve body can still normally generate boosting under the auxiliary action of the standby feedback spring, and the feedback spring can supplement the feedback action lost by the second feedback disc to a certain extent due to the existence of the feedback spring, but the driver can feel abnormal feeling during braking because the standby feedback spring is different from the feedback disc, so that a certain brake boosting action is still kept after the second feedback disc is failed, and the driver is reminded of abnormal feeling to carry out vehicle inspection, safety is embodied.

2. This wheel hub braking system of new energy vehicle, through setting the second feedback dish to the convex, make the one end of air valve and the inside contact of recess of second feedback dish, and the other end of second feedback dish then contacts with first feedback dish, the thickness of feedback dish in booster push rod moving direction has not only been increased like this, make the clearance between air valve and the feedback dish can be better be full of, make the booster push rod advance and retreat the produced clearance of in-process and tend to unanimous, reduce pressure hysteresis, and change the contact of traditional control valve body and first feedback dish and carry out the contact helping hand for second feedback dish and first feedback dish, and the area of outstanding part is less than the area of the one end of air valve, increase the helping hand ratio that single braking produced, make the brake more light.

3. The wheel hub braking system of the new energy vehicle is characterized in that a middle buffering device is arranged in the middle of one end of a push rod of a booster, and the push rod of the booster is divided into two parts which are respectively connected with the buffer device, thus ensuring that the buffer action of the return spring of the booster and the buffer device can be simultaneously utilized to reduce the instantaneous advancing speed of the push rod of the booster when the driver steps on the pedal suddenly in an emergency, thus, the pressure hysteresis phenomenon of stepping on the brake pedal in an emergency can be reduced to a certain extent, meanwhile, the safety short rod is arranged in the buffering device, so that the safety short rod is in direct contact with the inner wall of the buffering cylinder after the buffering effect of the booster return spring and the buffering device is overcome simultaneously by the second boosting rod, the braking effect generated after buffering can be normal, and the effect of delaying pressure is reduced to the maximum extent on the premise of ensuring the braking effect.

Drawings

FIG. 1 is a schematic cross-sectional view of the structure of the present invention;

FIG. 2 is an enlarged view of the point A in FIG. 1;

FIG. 3 is an enlarged view of the point B in FIG. 1.

In the figure: 1. a housing; 2. a vacuum tube; 3. a rear shell seal ring; 4. a booster piston body; 5. a diaphragm liner plate; 6. a membrane; 7. a piston body return spring; 8. a channel seal ring; 9. an airway spacer ring; 10. a first buckle; 11. a second buckle; 12. a card slot; 13. a limiting ring; 14. an outer ring spacer; 15. a C-shaped groove; 16. a main cylinder ejector rod; 17. a first feedback pad; 18. a second feedback pad; 19. a backup feedback spring; 20. an air valve; 21. a first assist lever; 22. a cushion cylinder; 23. a deceleration spring; 24. a spacer; 25. a second assist lever; 26. a valve body return spring; 27. a lever return spring; 28. an air filter ring; 29. safety short rod.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-3, a wheel hub brake system of a new energy vehicle comprises a housing 1, a vacuum tube 2 is fixedly connected to one end of the housing 1, a rear shell sealing ring 3 is fixedly installed in the middle of the inner wall of the housing 1, a boosting piston body 4 is movably installed on the inner side of the rear shell sealing ring 3, a diaphragm lining plate 5 is fixedly installed at one end of the boosting piston body 4, a front cavity is formed between one side of the diaphragm lining plate 5 and the housing 1, the vacuum tube 2 is communicated with the front cavity, a rear cavity is formed between the other side of the diaphragm lining plate 5 and the housing 1, a diaphragm 6 which is located on one side of the boosting piston body 4 and is attached to the inner wall of the front cavity of the housing 1 and is attached to the diaphragm lining plate 5 is installed on one side of the diaphragm lining plate 5 facing the front cavity, a piston body reset spring 7 is movably installed on one side of the diaphragm lining plate 5 facing, an air passage spacer ring 9 is movably connected inside the passage seal ring 8, a first buckle 10 is fixedly installed on the inner ring of one end of the air passage spacer ring 9 close to the membrane lining plate 5, a second buckle 11 is fixedly installed on the outer ring of one end of the air passage spacer ring 9 close to the membrane lining plate 5, the boosting piston body 4 is provided with a convex part protruding inwards, the convex part can be contacted with the end face of the air passage spacer ring 9 with the second buckle 11, a clamping groove 12 is arranged on the convex part, the clamping groove 12 can be clamped with the second buckle 11 of the air passage spacer ring 9, a limiting ring 13 positioned on one side of the passage seal ring 8 far away from the membrane lining plate 5 is fixedly installed inside the boosting piston body 4, an outer ring spacer 14 is fixedly installed inside one end of the boosting piston body 4, a C-shaped groove 15 with a notch facing the air passage spacer ring 9 is fixedly installed inside the outer ring spacer 14, and a main cylinder 16 positioned in the, the other end of the C-shaped groove 15 is fixedly connected with a first feedback disc 17, one side of the first feedback disc 17 far away from a main cylinder ejector rod 16 is fixedly provided with a second feedback disc 18, the outer side of the second feedback disc 18 is movably connected with a standby feedback spring 19, the inner part of an outer ring spacer 14 is movably connected with an air valve 20, one side of the air valve 20 positioned at a channel sealing ring 8 is movably connected with a first boosting rod 21, one end of the first boosting rod 21 is fixedly provided with a buffer cylinder 22, one end of the buffer cylinder 22 close to the first boosting rod 21 and connected with the air valve 20 is movably provided with a speed reducing spring 23, one end of the speed reducing spring 23 far away from the first boosting rod 21 is movably provided with a spacer 24, one end of the spacer 24 far away from the speed reducing spring 23 is fixedly connected with a second boosting rod 25, the outer side of the buffer cylinder 22 is provided with a limiting ring, the outer side of the buffer cylinder 22 is movably provided with a valve, an air filter ring 28 is fixedly arranged inside one end of the power-assisted piston body 4 far away from the mounting diaphragm lining plate 5, and one end of the spacer 24 far away from the second power-assisted rod 25 is fixedly connected with a safety short rod 29.

Wherein, the outer lane diameter of second feedback dish 18 is less than the outer lane diameter of first feedback dish 17, the cross sectional shape of second feedback dish 18 is convex and convex surface towards first feedback dish 17, through being provided with first feedback dish 17 and second feedback dish 18, can increase the holistic thickness of feedback dish to a certain extent, thereby make the clearance between air valve 20 and two feedback dishes can be better filled with, reduce the effect that the pressure lags behind, be convenient for the better judgement of driver, convex overhang and first feedback dish 17 contact simultaneously, the area of contact of second feedback dish 18 and first feedback dish 17 in the short time has been reduced, thereby the helping hand ratio in the short time has been increased, make the driver have better helping hand effect in the moment of trampling the brake pedal.

Wherein, the length of the spare feedback spring 19 is less than the length of the second feedback plate 18 after being compressed normally and the second feedback plate 18 does not deform when working normally, because the first feedback plate 17 and the second feedback plate 18 can reduce elasticity after being used for a long time, when the elasticity is lost and the compression assistance can not be carried out normally, the outer annular partition 14 can compress the spare feedback spring 19 after compressing the second feedback plate 18, and a certain assistance effect of the second feedback plate 18 is generated by the elastic action of the spare feedback spring 19, so as to ensure that a certain assistance effect can be temporarily realized by the spare feedback spring 19 after the first feedback plate 17 and the second feedback plate 18 lose the original normal action, but the assistance effect is not more than the original one, so that the driver can generate abnormal feeling, thereby the driver can be reminded to check while ensuring a certain assistance braking effect, the safety is increased.

Wherein, one side of air valve 20 and the contact of air flue spacer ring 9 is seted up the bayonet socket anastomotic with

first buckle

10, 11 joints of second buckle are in the inside of draw-in groove 12, first buckle 10, second buckle 11 and draw-in groove 12 are the annular, contact through between first buckle 10 and bayonet socket and second buckle 11 and the draw-in groove 12 forms zigzag's sealed joint mode, change traditional conflict sealing means, make current vacuum booster's leakproofness more intact, reduce vacuum booster's gas leakage phenomenon, make the effect of realization helping hand that booster can be fine, make the safety that equipment is more.

Wherein, the spacers 24 are all located inside the buffer cylinder 22 and form a buffer constant speed structure of the second assistant rod 25 with the speed reducing spring 23 and the safety short rod 29, because the buffer of the existing second assistant rod 25 is buffered by the rod return spring 27 inside, and such force is not enough to buffer the force applied by the driver in emergency, but the buffer constant speed structure is added, not only can well buffer the force applied by the driver at constant speed at ordinary times, so that the second assistant rod 25 can ensure the low speed of the second assistant rod 25 at constant speed as far as possible under the condition of ensuring normal assistant force in the advancing direction, thus the second assistant rod 25 with low speed can reduce the pressure lag phenomenon of the vacuum booster to a certain extent, and the safety short rod 29 can ensure that the force applied by the driver to the second assistant rod 25 in emergency can not be completely buffered and lagged by the speed reducing spring 23 to make the safety short rod 29 contact with the inner wall of the buffer cylinder 22, the normal boosting effect can be normally achieved after buffering is guaranteed, so that the normal boosting effect of the vacuum booster can be guaranteed while the phenomenon of pressure lag is reduced to the maximum extent.

The working principle is that a driver steps on a brake pedal, pushes a spacer 24 through a second boosting rod 25, and simultaneously compresses a rod return spring 27, one end of the spacer 24 compresses a speed reducing spring 23, one end of the speed reducing spring 23 pushes a buffer cylinder 22, the buffer cylinder 22 compresses a valve body return spring 26 through a baffle ring on the outer side, so as to push an air passage spacer ring 9, the air passage spacer ring 9 pushes a first buckle 10 and a second buckle 11 to move leftwards, the second buckle 11 is inserted into a clamping groove 12 and then closes a passage between a front cavity and a rear cavity, then the first boosting rod 21 pushes an air valve 20 to continue moving leftwards, so that the first buckle 10 is separated from a bayonet in the air valve 20, so as to open a passage between the rear cavity and the atmosphere, the atmosphere enters a hollow structure in the air passage spacer ring 9 through a boosting piston body 4 and enters a gap between the rear cavity and an outer ring spacer body 14, so as to communicate the atmosphere with the rear cavity, and form a pressure difference with vacuum, thereby promote diaphragm welt 5 and diaphragm 6 and remove left, whole helping hand piston body 4 removes left, meanwhile, first helping hand pole 21 promotes air valve 20 and removes left, make the one end of air valve 20 compress second feedback dish 18, one side of second feedback dish 18 compresses first feedback dish 17, first feedback dish 17 promotes C shape groove 15 and removes left, thereby promote main cylinder ejector pin 16 and remove left, when the state reaches the equilibrium, first buckle 10 can reinsert in the bayonet socket of air valve 20, realize stable helping hand, when emergency braking, second helping hand pole 25 has overcome the effort of pole reset spring 27 and speed reduction spring 23 completely after, safe short rod 29 and the contact of cushion cylinder 22 inner wall, thereby make cushion cylinder 22 produce thrust, accomplish subsequent braking.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A wheel hub braking system of new energy vehicle, includes casing (1), its characterized in that: the vacuum tube (2) is connected onto the shell (1), the boosting piston body (4) is installed in the shell (1), the rear shell sealing ring (3) is fixedly installed between the boosting piston body (4) and the shell (1), the diaphragm lining plate (5) is fixedly installed at one end of the boosting piston body (4), a front cavity is formed between one side of the diaphragm lining plate (5) and the shell (1), the vacuum tube (2) is communicated with the front cavity, a rear cavity is formed between the other side of the diaphragm lining plate (5) and the shell (1), a diaphragm (6) which is located from one side of the boosting piston body (4) to the inner wall of the front cavity of the shell (1) in a fit manner and is attached to the diaphragm lining plate (5) is installed on one side of the diaphragm lining plate (5) facing the front cavity, a piston body reset spring (7) is movably installed on one side of the diaphragm lining plate, the booster piston body (4) is of a hollow barrel structure, a channel sealing ring (8) is fixedly mounted in the middle of the inner wall of the booster piston body (4), an air passage spacer ring (9) is movably connected in the inner part of the channel sealing ring (8), a first buckle (10) is fixedly mounted in the inner ring of one end of the air passage spacer ring (9) close to a membrane lining plate (5), a second buckle (11) is fixedly mounted in the outer ring of one end of the air passage spacer ring (9) close to the membrane lining plate (5), the booster piston body (4) is provided with an inward protruding part which is in contact with the air passage spacer ring (9), a clamping groove (12) for clamping the second buckle (11) is formed in the protruding part, a limiting ring (13) which is located on one side of the channel sealing ring (8) far away from the membrane lining plate (5) is fixedly mounted in the inner part of the booster piston body (4), and the inner part with one end of the membrane lining plate (5) The outer ring spacer (14), the inside fixed mounting of outer ring spacer (14) has C shape groove (15) of notch orientation air flue spacer (9), the orientation of C shape groove (15) to the one end fixed mounting in front chamber has main cylinder ejector pin (16), the other end fixedly connected with first feedback dish (17) in C shape groove (15), one side that deviates from main cylinder ejector pin (16) of first feedback dish (17) is fixed and is equipped with second feedback dish (18), the outside swing joint of second feedback dish (18) has reserve feedback spring (19), the inside swing joint of outer ring spacer (14) has air valve (20), the orientation of air valve (20) the one end of passageway sealing washer (8) has first helping hand pole (21) in inside swing joint, keeping away from of first helping hand pole (21) the one end fixed mounting of air valve (20) has buffer cylinder (22), a speed reducing spring (23) is movably arranged at one end of the interior of the buffer cylinder (22) close to the first boosting rod (21), a spacer (24) is movably arranged at one end of the speed reducing spring (23) far away from the first boosting rod (21), one end of the spacer (24) departing from the decelerating springs (23) and (23) is fixedly connected with a second boosting rod (25), a limit ring is arranged on the outer side of the buffer cylinder (22), a valve body return spring (26) which is propped against the limit ring and the air passage spacer ring (9) is movably arranged on the outer side of the buffer cylinder (22), one end of the air passage spacer ring (9) far away from the air valve (20) is movably connected with a rod return spring (27), an air filter ring (28) is fixedly arranged in one end of the boosting piston body (4) far away from the mounting diaphragm lining plate (5), one end of the spacer (24) departing from the second boosting rod (25) is fixedly connected with a safety short rod (29).

2. The wheel hub brake system of the new energy vehicle as claimed in claim 1, wherein: the diameter of the outer ring of the second feedback disc (18) is smaller than that of the outer ring of the first feedback disc (17), the cross section of the second feedback disc (18) is convex, the convex surface of the second feedback disc faces the first feedback disc (17), one end of the standby feedback spring (19) on the outer side of the second feedback disc (18) abuts against the first feedback disc (17), and the other end of the standby feedback spring abuts against the outer ring spacer (14).

3. The wheel hub brake system of the new energy vehicle as claimed in claim 1, wherein: the length of the standby feedback spring (19) is smaller than the length of the second feedback disc (18) after normal compression, and the standby feedback spring does not deform when the second feedback disc (18) works normally.

4. The wheel hub brake system of the new energy vehicle as claimed in claim 1, wherein: the air valve (20) and the air passage spacer ring (9) are in contact, one side of the air valve is provided with a bayonet matched with the first buckle (10), the second buckle (11) is clamped inside the clamping groove (12), and the first buckle (10), the second buckle (11) and the clamping groove (12) are all annular.

5. The wheel hub brake system of the new energy vehicle as claimed in claim 1, wherein: the spacers (24) are all located in the buffer cylinder (22) and form a buffer constant-speed structure of the second boosting rod (25) together with the speed reducing spring (23) and the safety short rod (29).