阅读说明：本技术 一种新能源车用制动主缸 (Brake master cylinder for new energy vehicle ) 是由 孙丹妮 于 2021-11-09 设计创作，主要内容包括：本发明公开了一种新能源车用制动主缸,包括主缸,主缸的顶部设有第一补偿孔和第二补偿孔,可与上方的油箱连通；主缸内依次设有主推杆、第一活塞和第二活塞,主缸侧方设第一排油口和第二排油口,主推杆的一端与真空助力器的输出端相连接,第二活塞一端与主缸的内壁弹性连接；主推杆能够驱动第一活塞及第二活塞移动,第一活塞往返移动能够封堵或开启第一补偿孔,第二活塞往返移动能够封堵或开启第二补偿孔；第一活塞上靠近第二活塞的一端设有第一皮碗,第二活塞靠近第一活塞的一侧设有第二皮碗,第一皮碗与第二皮碗弹性连接。本发明的制动主缸密封性强,并且在第一活塞或第二活塞失效的情况下仍能正常制动,安全性高、实用性强。(The invention discloses a brake master cylinder for a new energy vehicle, which comprises a master cylinder, wherein the top of the master cylinder is provided with a first compensation hole and a second compensation hole which can be communicated with an oil tank above the first compensation hole; a main push rod, a first piston and a second piston are sequentially arranged in the main cylinder, a first oil discharge port and a second oil discharge port are arranged on the side of the main cylinder, one end of the main push rod is connected with the output end of the vacuum booster, and one end of the second piston is elastically connected with the inner wall of the main cylinder; the main push rod can drive the first piston and the second piston to move, the first piston can seal or open the first compensation hole when moving back and forth, and the second piston can seal or open the second compensation hole when moving back and forth; one end of the first piston, which is close to the second piston, is provided with a first leather cup, one side of the second piston, which is close to the first piston, is provided with a second leather cup, and the first leather cup is elastically connected with the second leather cup. The brake master cylinder disclosed by the invention has strong sealing performance, can still perform normal braking under the condition that the first piston or the second piston fails, and has high safety and strong practicability.)

1. A brake master cylinder for a new energy vehicle comprises a master cylinder (20), wherein an oil tank (10) is arranged above the master cylinder (20), and a first compensation hole (212) and a second compensation hole (222) are formed in the top of the master cylinder (20) and are used for being communicated with the oil tank (10); a main push rod (33), a first piston (31) and a second piston (32) are sequentially arranged in the main cylinder (20), a first oil discharge port (23) and a second oil discharge port (24) are arranged on the side of the main cylinder (20), one end, far away from the first piston (31), of the main push rod (33) is connected with the output end of a vacuum booster, and one end, far away from the first piston (31), of the second piston (32) is elastically connected with the inner wall of the main cylinder (20); the main push rod (33) can drive the first piston (31) and the second piston (32) to move, the first piston (31) can block or open the first compensation hole (212) when moving back and forth, and the second piston (32) can block or open the second compensation hole (222) when moving back and forth; it is characterized in that the preparation method is characterized in that,

be close to on first piston (31) the one end of second piston (32) is equipped with first leather cup (34), second piston (32) are close to one side of first piston (31) is equipped with second leather cup (35), first leather cup (34) with second leather cup (35) elastic connection.

2. The brake master cylinder for the new energy vehicle as claimed in claim 1, wherein an adapter (41) is arranged on one side of the second leather cup (35) close to the first leather cup (34), and a first return spring (37) is arranged between the adapter (41) and the first leather cup (34);

a first boss (411) is arranged on one side of the connecting piece (41), and a second boss (412) is arranged on the other side of the connecting piece (41); the first boss (411) is arranged opposite to the first piston (31), and the first boss (411) is sleeved in the first return spring (37); the second boss (412) penetrates through the second leather cup (35) and is connected with the second piston (32).

3. The brake master cylinder for the new energy vehicle as claimed in claim 2, wherein a first push rod (43) is arranged at one end of the first piston (31) close to the second piston (32), and one end of the first push rod (43) far away from the first piston (31) penetrates through the first leather cup (34) and is arranged opposite to the first boss (411);

an auxiliary sleeve body (42) is arranged between the first push rod (43) and the connecting piece (41), one end of the auxiliary sleeve body (42) is fixedly connected with the connecting piece (41) and sleeved outside the first boss (411), and the other end of the auxiliary sleeve body (42) is sleeved outside the first push rod (43); the first return spring (37) is sleeved on the outer side of the auxiliary sleeve body (42).

4. The brake master cylinder for the new energy vehicle as defined in claim 3, wherein a groove is configured on a terminal end surface of the first piston (31) far away from the main push rod (33), the groove and the first cup (34) cooperate to form a hollow cavity (45), and the first push rod (43) is inserted into the hollow cavity (45).

5. The brake master cylinder for the new energy vehicle according to claim 3, wherein a reinforcement assembly is provided inside the first piston (31), the reinforcement assembly including a plate-shaped first reinforcement (51) and an annular second reinforcement (52); the second reinforcement (52) is fitted in the first reinforcement (51), and the second reinforcement (52) is disposed concentrically with the first piston (31).

6. The brake master cylinder for the new energy vehicle as defined in claim 1, wherein one end of the main push rod (33) away from the first piston (31) penetrates a front end portion of the master cylinder (20), and a dust-proof assembly (60) is provided at the front end portion of the master cylinder (20); the dustproof assembly (60) is of a double-layer structure and comprises a first dustproof sleeve (61) arranged outside and a second dustproof sleeve (62) arranged inside, and the main push rod (33) is sleeved in the second dustproof sleeve (62);

the first dustproof sleeve (61) is of a funnel-shaped structure, the side wall of the first dustproof sleeve is provided with a plurality of ridges (611) and a plurality of valleys (612), and the ridges (611) and the valleys (612) are arranged at intervals;

the outer wall of the second dustproof sleeve (62) is provided with a plurality of strip-shaped reinforcing ribs (63) protruding outwards, the strip-shaped reinforcing ribs (63) are arranged in a one-to-one correspondence mode with the valleys (612), and the inner wall positions corresponding to the valleys (612) are connected with the strip-shaped reinforcing ribs (63).

7. The brake master cylinder for the new energy vehicle according to claim 6, wherein the outer wall of the second dust cover (62) is provided with an annular reinforcing rib (64), and the annular reinforcing rib (64) is connected with the strip-shaped reinforcing rib (63) in a crossing manner.

8. The brake master cylinder for the new energy vehicle as claimed in claim 6, wherein an adjusting assembly is arranged inside the second dust cover (62) and comprises two adjusting rings (65), and the main push rod (33) is sleeved in the adjusting rings (65); a plurality of elastic rings (66) are arranged between the two adjusting rings (65), and the elastic rings (66) are uniformly distributed around the main push rod (33).

9. The brake master cylinder for the new energy vehicle as claimed in claim 1, wherein the first cup (34) and the first piston (31) and the second cup (35) and the second piston (32) are connected by fastening nails; the fastening nail comprises a screw rod (71) and a nut (72) which are fixedly connected, wherein the screw rod (71) is provided with a conical thread (73).

Technical Field

The invention belongs to the technical field of automobile braking, and particularly relates to a brake master cylinder for a new energy automobile.

Background

The automobile brake system is taken as the most basic safety control system of the automobile, and the performance of the automobile brake system directly determines the safety performance of the whole automobile. The hydraulic brake system is widely applied to small and medium-sized automobiles. The brake master cylinder is used for converting force, amplified and transmitted by the vacuum booster, of a driver for treading a brake pedal into hydraulic pressure according to the principles of hydraulic energy arrangement, liquid non-compression and liquid energy transmission, and transmitting the hydraulic pressure to each brake through a brake pipeline to generate the braking effect of decelerating or stopping the automobile.

The structure of a common crossed hydraulic brake system is shown in fig. 1, a brake master cylinder of the crossed hydraulic brake system is of a double-cavity type and adopts a diagonal arrangement double-loop form, one brake loop consists of a master cylinder front cavity, a left rear wheel cylinder and a right front wheel cylinder, and the other brake loop consists of a master cylinder rear cavity, a right rear wheel cylinder and a left front wheel cylinder, so that the condition that when one brake loop fails, the other brake loop can normally work and a vehicle cannot deflect is ensured.

The utility model discloses a utility model patent that application number is CN201720436159.7 discloses an automobile-used brake master cylinder of new forms of energy, including cylinder body, first piston, second piston and push rod, still include the third piston, the third piston is connected with the push rod, is equipped with the hydraulic pressure chamber between third piston and second piston, and the cylinder body is connected with a pressure boost energy storage ware, pressure boost energy storage ware and hydraulic pressure chamber intercommunication. The utility model discloses a through addding hydraulic pressure chamber, third piston, pressure boost energy storage ware, can the direct control pressure boost energy storage ware establish hydraulic pressure at the hydraulic pressure intracavity, realize the initiative brake, improve the intelligent level of car control, simultaneously, the utility model discloses a hydraulic pressure size that pressure boost energy storage ware can adjust the hydraulic pressure chamber very conveniently to match different dynamics of driving the person different and custom hard, thereby realize the regulation that the footboard felt from person to person.

The invention patent with application number CN201110433761.2 provides a brake master cylinder assembly, which adopts a pressure reducing ring assembly matched with a first piston, a second piston and a main leather cup assembly for use, when a brake system is in a non-working state, the main leather cup assembly and the pressure reducing ring assembly enable brake liquid of a liquid storage tank to form a liquid passage with a first piston working cavity and a second piston working cavity; when the braking system brakes, the gap is closed, so that a liquid passage formed by the braking liquid of the liquid storage tank, the first piston working cavity and the second piston working cavity is closed. The invention can replace the center valve structure in the center valve type brake master cylinder assembly special for the ABS brake anti-lock system, and also has the advantages of few parts, simple structure and easy assembly.

Disclosure of Invention

The invention aims to provide a brake master cylinder for a new energy vehicle, which has the advantages of strong sealing performance, good stability, high safety and long service life.

The technical scheme adopted by the invention for realizing the purpose is as follows:

the brake master cylinder for the new energy vehicle comprises a master cylinder, wherein an oil tank is arranged above the master cylinder, and a first compensation hole and a second compensation hole are formed in the top of the master cylinder and are communicated with the oil tank; a main push rod, a first piston and a second piston are sequentially arranged in the main cylinder, a first oil discharge port and a second oil discharge port are arranged on the side of the main cylinder, one end of the main push rod, far away from the first piston, is connected with the output end of the vacuum booster, and one end of the second piston, far away from the first piston, is elastically connected with the inner wall of the main cylinder; the main push rod can drive the first piston and the second piston to move, the first piston can seal or open the first compensation hole when moving back and forth, and the second piston can seal or open the second compensation hole when moving back and forth; one end of the first piston, which is close to the second piston, is provided with a first leather cup, one side of the second piston, which is close to the first piston, is provided with a second leather cup, and the first leather cup is elastically connected with the second leather cup.

Specifically, the master cylinder is communicated with an oil tank, and brake fluid is stored in the oil tank. The top of the master cylinder is provided with a first port and a second port for communicating with an oil tank. An oil return hole and a compensation hole are formed in the first port and the second port, and the compensation hole is formed in one side, far away from the main push rod, of the oil return hole. The side of the main cylinder is provided with a front oil discharge pipe and a rear oil discharge pipe which are respectively connected to the first oil discharge port and the second oil discharge port at positions corresponding to the first piston and the second piston. The first piston and the second piston are located inside the main cylinder, the first piston and the first oil discharge port are connected with a left rear wheel cylinder and a right front wheel cylinder of an automobile to form a first brake loop, the second piston and the second oil discharge port are connected with a right rear wheel cylinder and a left front wheel cylinder of the automobile to form a second brake loop, cross braking is achieved, four wheels of the automobile input brake fluid in an X mode to brake the wheels of the automobile, braking of one front wheel and one rear wheel can be guaranteed under the condition that the first piston or the second piston fails, the front wheel and the rear wheel are not on the same side, stability of the automobile in the automatic process is guaranteed, overturning, slipping and deviation cannot occur, and safety is improved.

After the driver depresses the brake pedal, the vacuum booster acts on the inside of the master cylinder through the main push rod, pushing the first piston through the first port above it, the pressure in the first brake circuit increases, causing the second piston to move on the second port, and the pressure in the second brake circuit increases. After the first piston and the second piston move to a certain position, the first oil outlet and the second oil outlet are respectively communicated with the first brake circuit and the second brake circuit, and brake fluid in the first brake circuit and the second brake circuit acts on the brake through the first oil outlet and the second oil outlet respectively, so that the brake effect is realized. After braking is finished, the brake fluid flows back to the first brake circuit and the second brake circuit, and the first piston and the second piston return to the initial positions.

By adopting the technical scheme, the first leather cup and the second leather cup are respectively arranged on the end faces, opposite to the second piston, of the first piston, smooth transmission is guaranteed, the sealing performance of the first piston and the second piston in the sliding process in the main cylinder is enhanced, brake fluid is prevented from leaking, and the braking sensitivity can be guaranteed. In the braking process, the main push rod applies thrust to the first piston, the pressure in the first braking loop is increased, and the thrust is transmitted to the second braking loop through the elastic shape to promote the second piston to move, so that the braking effect is realized. First piston and second piston elastic connection can guarantee that pressure transmission is steady, smooth and easy to the degree of wear to the main cylinder inner assembly is little, can guarantee life.

According to one embodiment of the invention, a matching piece is arranged on one side, close to the first leather cup, of the second leather cup, and a first return spring is arranged between the matching piece and the first leather cup; a first boss is arranged on one side of the connecting piece, a second boss is arranged on the other side of the connecting piece, and the first boss is arranged opposite to the first leather cup and sleeved in the first return spring; the second boss penetrates through the second leather cup and is connected with the second piston.

The coupling piece is a disc-shaped structure, a second boss on one side of the coupling piece is sleeved in the second leather cup, and a sealing piece is arranged at a position point where the second boss and the second leather cup are in penetrating connection, so that the sealing effect of the second leather cup is not affected. And the first boss has spacing and guide effects on the first return spring, so that the first return spring can be prevented from being disjointed. Thereby, the elastic connection of the second piston with the first piston is achieved by the first return spring.

According to one embodiment of the invention, a first push rod is arranged at one end of the first piston close to the second piston, and one end of the first push rod far away from the first piston penetrates through the first leather cup and is arranged opposite to the first boss;

an auxiliary sleeve body is arranged between the first push rod and the matching piece, one end of the auxiliary sleeve body is fixedly connected with the matching piece and sleeved outside the first boss, and the other end of the auxiliary sleeve body is sleeved outside the first push rod; the first return spring is sleeved outside the auxiliary sleeve body.

That is to say, the first boss and the end of the first push rod away from the first piston are oppositely arranged and are sleeved in the auxiliary sleeve body. One end of the auxiliary sleeve body is fixedly connected with the side face of the matching piece, the other end of the auxiliary sleeve body is fixedly connected with the end part of the first push rod, and the first return spring is sleeved on the outer side of the auxiliary sleeve body. The auxiliary sleeve body can ensure that the first return spring is accurately assembled and positioned, the first piston and the second piston are accurately aligned, and the stress is balanced.

In order to ensure the sealing performance of the first packing cup, a sealing element is also arranged at the position of the through connection of the first push rod and the first packing cup for sealing treatment.

And under the condition that the first piston and the second piston are not failed, the automobile can be braked normally. The first piston pushes the first return spring to one side of the second piston under the action of the main push rod, and the first return spring is stressed to contract and transmits pushing force to the second piston to enable the second piston to move towards the end face of the main cylinder. When the braking force of the brake is small, the first return spring in the contraction state can release energy to recover deformation after the brake fluid returns, and the first piston is reset. The pressure borne by the second piston and coming from the first return spring is gradually reduced, and meanwhile, the second piston is gradually reset under the action of elastic pressure at the joint of the inner wall of the main cylinder.

Under the condition that the first piston or the second piston fails, the first piston pushes the first return spring to one side of the second piston under the pushing action of the main push rod. After the first return spring is stressed and contracted to the compression limit, the first push rod is abutted to the matching piece, and then the second piston is pushed to generate displacement, so that brake fluid can be normally discharged, braking is realized, and safety is improved.

Furthermore, the auxiliary sleeve body is made of rubber. Therefore, the auxiliary sleeve body has certain elasticity and has certain auxiliary effect on the contraction of the first return spring under the pushing action of the first piston. In addition, the brake fluid in the peripheral range of the first return spring can be influenced through the shrinkage deformation of the auxiliary sleeve body, the brake fluid discharging efficiency is improved, and the response speed of brake braking is improved.

According to an embodiment of the present invention, a groove is disposed on an end surface of the first piston, which is far away from the end of the main push rod, the groove is matched with the first leather cup to form a hollow cavity, and the first push rod is inserted into the hollow cavity.

First piston end face sets up the recess of indent, forms well cavity after contacting with first leather cup, under the prerequisite of guaranteeing sealing connection between first push rod and the first leather cup for the tip of first leather cup and first piston is equipped with the persistence space, realizes the effective fixed of first leather cup and first piston and adsorbs, can avoid the two separation to drop, improves leakproofness, fastening nature, guarantees pressure transmission's stability.

At first leather cup in long-time use, because the setting of well cavity, the middle part that can lead to first leather cup under the impetus of brake fluid is close to the structure in the cavity nearby and inwards caves in, so, can realize the promotion of the tight degree of connection between first leather cup and the first piston on the one hand, the inside sunken marginal outward extension that can lead to its this sunk part in the middle part of the first leather cup of on the other hand, this deformation is favorable to first leather cup in the use little grow of external diameter slightly, can be used to resist the peripheral wearing and tearing of first leather cup that leads to in the long-time use, in case sealing failure etc. are bad.

According to an embodiment of the present invention, the first piston is provided at an inner portion thereof with a reinforcement assembly including a plate-shaped first reinforcement member connected to an inner wall of the first piston and a ring-shaped second reinforcement member nested in the first reinforcement member and disposed concentrically with the first piston.

The first reinforcing piece and the second reinforcing piece are made of the same material as the first piston and made of flexible sealing materials. And the first piston may be provided with a plurality of sets of reinforcement members along the axial direction thereof. Therefore, the rigidity strength of the first piston is improved through the first reinforcing piece and the second reinforcing piece, the probability of cracking of the first piston in the long-time use process can be reduced, and the service life is prolonged.

According to one embodiment of the invention, one end of the main push rod, which is far away from the first piston, penetrates through the front end part of the main cylinder, and the front end part of the main cylinder is provided with a dustproof assembly; the dustproof assembly is of a double-layer structure and comprises a first dustproof sleeve arranged outside and a second dustproof sleeve arranged inside, and the main push rod is sleeved in the second dustproof sleeve;

the first dustproof sleeve is of a funnel-shaped structure, the side wall of the first dustproof sleeve is provided with a plurality of convex ridges and a plurality of concave valleys, and the convex ridges and the concave valleys are arranged at intervals; the outer wall of the second dustproof sleeve is provided with a plurality of strip-shaped reinforcing ribs protruding outwards, the strip-shaped reinforcing ribs are arranged in one-to-one correspondence with the valleys, and the inner wall positions corresponding to the valleys are connected with the strip-shaped reinforcing ribs.

The side wall of the first dustproof sleeve is provided with a plurality of ridges and valleys which are staggered at intervals, and wrinkles are formed on the surface of the first dustproof sleeve and can guide external dust. Furthermore, the raised ridges and the valleys are arranged in a bending mode in the same direction relative to the axis of the first dustproof sleeve, and a certain included angle is formed between every two adjacent raised ridges. So, the crooked slot of fold structure in the outside formation of first dirt proof boot, the smooth no edges and corners of surface of first dirt proof boot do not have the barb to be favorable to the dust along the slot landing, prevent that the dust from piling up.

From this, dustproof subassembly is used for preventing the entering of external dust, and its bilayer structure not only can improve dustproof effect, can also avoid rubber ageing to lead to the dirt proof boot to break, avoids the dust to get into, strengthens the protection to master cylinder inner structure, increase of service life.

The second dust-proof sleeve is provided with the strip-shaped reinforcing ribs protruding outwards and is connected with the inner wall of the first dust-proof sleeve through the reinforcing ribs, and therefore a space with intervals is formed between the first dust-proof sleeve and the second dust-proof sleeve, when the dust-proof assembly contracts, the interval space can change the shape accordingly, and therefore the dust particles and the like possibly adhered to the outer wall of the first dust-proof sleeve or the outer wall of the second dust-proof sleeve can be promoted to fall off, and the dust-proof effect is improved. On the other hand, set up hollow interval space between first dirt proof boot and the second dirt proof boot and be favorable to absorbing the noise that the braking in-process produced, produced abnormal sound probability when reducing or reducing brake, improvement user uses and experiences.

According to an embodiment of the present invention, the outer wall of the second dust-proof sleeve is provided with an annular reinforcing rib, and the annular reinforcing rib and the strip-shaped reinforcing rib are connected in a cross manner. From this, can further improve the tight degree of being connected between first dirt proof boot and the second dirt proof boot, prevent to drop.

According to one embodiment of the invention, the second dustproof sleeve is internally provided with an adjusting component which comprises two adjusting rings, and the main push rod is sleeved in the adjusting rings; a plurality of elastic rings are arranged between the two adjusting rings and evenly distributed around the main push rod. The ring body of the elastic ring is connected with a left adjusting ring and a right adjusting ring.

Therefore, the vibration force generated in the operation process of the main push rod can be absorbed through the adjusting assembly, and the stability of the interior of the main cylinder is kept. In addition, in the operation process of the main push rod, the surface of the main push rod can be cleaned through the sliding of the adjusting ring, the elastic ring and the like relative to the surface of the main push rod, so that dust particles are prevented from being brought into the main cylinder in the operation process of the main push rod.

According to one embodiment of the invention, the first leather cup and the first piston and the second leather cup and the second piston are connected through fastening nails; thereby, the sealing performance can be improved.

The fastening nail comprises a screw and a nut which are fixedly connected, and the screw is provided with a conical thread.

So, the structure that adopts the circular cone screw thread can improve between first leather cup and the first piston and the second leather cup and the second piston be connected the steadiness, effectively prevents to drop.

According to the invention, as the connecting piece, the first push rod and the like are arranged between the first piston and the second piston for connection, the braking of the automobile can be still realized under the condition that the first piston or the second piston is invalid, and the risk of safety accidents is reduced. First piston, second piston respectively with first leather cup, the cooperation of second leather cup, improve the leakproofness of the in-process that slides. Set up well cavity between first leather cup and the first piston and further guarantee the inseparability that the two are connected, improve stability. The main push rod is equipped with dustproof subassembly with the master cylinder junction, can prevent effectively that the dust from getting into the master cylinder inside, guarantees that the braking operation is accurate not receive external disturbance. Therefore, the brake master cylinder for the new energy vehicle has the advantages of strong sealing performance, good braking effect, high safety and long service life.

Drawings

FIG. 1 is a schematic structural diagram of a cross-type hydraulic brake system of an automobile;

fig. 2 is a schematic perspective view of a brake master cylinder for a new energy vehicle according to embodiment 1 of the present invention;

FIG. 3 is an exploded view of the master cylinder of FIG. 2;

FIG. 4 is an assembled view of the internal structure of the master cylinder of FIG. 2;

FIG. 5 is a partial enlarged view of portion A of FIG. 4;

fig. 6 is a schematic structural view of a first piston of a brake master cylinder for a new energy vehicle according to embodiment 2 of the present invention;

FIG. 7 is a schematic cross-sectional view of the first piston of FIG. 6;

fig. 8 is a schematic structural view of a dust prevention assembly of a brake master cylinder for a new energy vehicle according to embodiment 2 of the present invention;

FIG. 9 is a front view of a second dust boot of the dust boot assembly of FIG. 8;

FIG. 10 is a cross-sectional view of the second dust boot of FIG. 9 taken along line B-B;

fig. 11 is a schematic structural view of a fastening nail of a brake master cylinder for a new energy vehicle according to embodiment 3 of the present invention.

Reference numerals: a fuel tank 10; a master cylinder 20; the port 21 first oil return hole 211; a first compensation hole 212; a second oil return hole 221; a second compensation hole 222; a first oil discharge port 23; a second oil drain port 24; a first piston 31; a second piston 32; a main push rod 33; a first cup 34; a second cup 35; an auxiliary cup 36; a first return spring 37; a second return spring 38; a fitting 41; a first boss 411; a second boss 412; an auxiliary sheath body 42; a first push rod 43; a fixed block 44; a hollow cavity 45; a first reinforcement 51; a second reinforcement 52; a dust-proof assembly 60; a first dust-proof cover 61; the ridge 611; a valley 612; a second dust boot 62; a strip-shaped reinforcing rib 63; an annular reinforcing rib 64; an adjusting ring 65; an elastic ring 66; a rubber rod 67; a screw 71; a nut 72; a conical thread 73.

Detailed Description

The technical solution of the present invention is further described in detail below with reference to the following detailed description and the accompanying drawings:

example 1:

fig. 2 to 5 schematically show a brake master cylinder for a new energy vehicle according to an embodiment of the present invention, which is used for a cross hydraulic brake of a vehicle. As shown in the figure, the device includes an oil tank 10 and a master cylinder 20 which are arranged up and down, brake fluid is stored in the oil tank 10, two ports 21 are arranged at the top of the master cylinder 20, a first oil return hole 211 and a first compensation hole 212 are arranged in the port 21 close to the first piston 31, and a second oil return hole 221 and a second compensation hole 222 are arranged in the port 21 close to the second piston 32 and are used for being communicated with the oil tank 10. The master cylinder 20 is provided with a main push rod 33, a first piston 31 and a second piston 32 in sequence, the first piston 31 is arranged corresponding to one port 21, the second piston 32 is arranged corresponding to the other port 21, and a first compensation hole 212 and a second compensation hole 222 are respectively arranged at one sides of the first oil return hole 211 and the second oil return hole 221 far away from the main push rod 33. The end faces of the first piston 31 and the second piston 32, which are oppositely arranged, are respectively provided with a first leather cup 34 and a second leather cup 35, and the tail ends of the first piston 31 and the second piston 32, which are oppositely arranged, are respectively provided with an auxiliary leather cup 36, so that the sealing performance of the first piston 31 and the second piston 32 in the sliding process is improved, and the braking sensitivity is ensured.

One end of the main push rod 33, which is far away from the first piston 31, penetrates through the front end surface of the main cylinder 20 and is exposed outside, and is connected with the output end of the vacuum booster; the first piston 31 and the second piston 32 are elastically connected through a first return spring 37, and the first return spring 37 is arranged between the first cup 34 and the second cup 35. An end of the second piston 32 remote from the first piston 31 is elastically connected to an inner wall of the rear end surface of the master cylinder 20 by a second return spring 38. Two oil discharge pipes, one in front and the other in back, are provided at positions corresponding to the first piston 31 and the second piston 32 on the side of the master cylinder 20, and are connected to the first oil discharge port 23 and the second oil discharge port 24, respectively. The main rod 33 can drive the first piston 31 and the second piston 32 to move, the first piston 31 can block or open the first oil discharge port 23 when moving back and forth, and the second piston 32 can block or open the second oil discharge port 24 when moving back and forth. The first piston 31 and the second piston 32 are located inside the master cylinder 20, the first piston 31 and the first oil discharge port 23 are connected with a left rear wheel cylinder and a right front wheel cylinder of the automobile to form a first brake circuit, and the second piston 32 and the second oil discharge port 24 are connected with a right rear wheel cylinder and a left front wheel cylinder of the automobile to form a second brake circuit, so that crossed braking is realized.

In a non-working state, the first cup 34 and the auxiliary cup 36 on the end surface of the second piston 32 are respectively located between the first compensation hole 212 and the first oil return hole 211, and the second compensation hole 222 and the second oil return hole 221, and the first brake circuit and the second brake circuit are communicated with the oil tank 10 through the compensation holes. After the driver steps on the brake pedal, the main push rod 33 pushes the first piston 31 through the port 21 above the main push rod under the action of the vacuum booster, the first cup 34 blocks the first compensation hole 212 on the main push rod, and the hydraulic pressure in the first brake circuit is increased. Under the action of the first piston 31 and the first return spring 37, the second piston 32 moves on the other port 21 and compresses the second return spring 38, the auxiliary cup 36 on the end face of the second piston 32 blocks the second compensation hole 222, and the hydraulic pressure in the second brake circuit rises. When the thrust of the thrust rod is increased continuously, the brake fluid in the first brake circuit and the brake fluid in the second brake circuit are respectively conveyed to the brake along with the first oil outlet 23 and the second oil outlet 24 through the oil discharge pipe to generate braking force. When the driver releases the pedal, the first piston 31 returns to the initial position by the first return spring 37, and the second piston 32 returns to the initial position by the second return spring 38, so that the brake is released.

A connecting member is also provided between the first piston 31 and the second piston 32. Specifically, the connecting piece comprises a connecting piece 41, the connecting piece 41 is arranged on one side, close to the first leather cup 34, of the second leather cup 35, an auxiliary sleeve body 42 is further arranged between the connecting piece 41 and the first leather cup 34, and the first return spring 37 is sleeved on the outer side of the auxiliary sleeve body 42 and arranged between the first leather cup 34 and the connecting piece 41; a first push rod 43 is connected to one end of the first piston 31 close to the second piston 32 through a screw thread, and one end of the first push rod 43 far from the first piston 31 penetrates through the first leather cup 34 and is arranged opposite to the adapter 41. One end of the auxiliary sleeve body 42 is fixedly connected with the side surface of the connecting piece 41, and the other end is connected with the first push rod 43. The adapter 41 is a disc-shaped mechanism, one side of which is provided with a first boss 411, the other side of which is provided with a second boss 412, the first boss 411 is sleeved inside the auxiliary sleeve body 42 and is arranged opposite to the first leather cup 34 and the first push rod 43; the second boss 412 extends through the second cup 35 and is connected to the second piston 32.

The auxiliary sleeve body 42 can ensure that the first return spring 37 is accurately assembled and positioned, and ensure that the first piston 31 and the second piston 32 are accurately aligned and stressed in a balanced manner. The end of the first push rod 43 far away from the first piston 31 is fixedly connected with a circular fixing block 44, the fixing block 44 and the first push rod 43 are concentrically arranged, and the diameter of the fixing block 44 is larger than that of the first push rod 43, so that the first push rod 43 can be prevented from being separated from the auxiliary sleeve body 42, the stability of connection between the first piston 31 and the second piston 32 is ensured, and the smooth energy transmission is ensured.

The point of the through connection between the first push rod 43 and the first cup 34 and the point of the through connection between the second boss 412 and the second cup 35 are provided with sealing elements for sealing connection, so as to ensure the sealing performance of the first cup 34 and the second cup 35.

In the event of failure of the first piston 31, the first piston 31 pushes the first return spring 37 toward the second piston 32 side by the pushing action of the main push rod 33. The hydraulic pressure in the first brake circuit is unchanged due to the failure of the first piston 31 such that the first cup 34 cannot normally close the compensating bore in the first port 2121. Under the pushing action of the first push rod 43, the first return spring 37 is stressed to contract, after the first return spring is compressed to the limit, the first push rod 43 is abutted to the matching piece 41, the second piston 32 is further pushed to generate displacement, the auxiliary leather cup 36 on the end surface of the second piston 32 blocks the compensation hole in the second port 21, and hydraulic pressure difference is formed, so that brake fluid can be normally discharged from the second oil discharge port 24, braking is realized, and safety is improved. The failure of the second piston 32 is similar.

The auxiliary sleeve body 42 may be made of a rubber material with a certain elasticity, and has a certain auxiliary effect on the contraction of the first return spring 37 under the pushing effect of the first piston 31, and particularly, when the first piston 31 or the second piston 32 fails, the auxiliary sleeve body 42 is pushed by the first push rod 43 to be elastically deformed, and the second piston 32 is pushed by the matching part 41 to move, so that the braking sensitivity is improved. In addition, the auxiliary sleeve body 42 can drive the brake fluid around the auxiliary sleeve body to flow in the elastic deformation process, so that the discharge of the brake fluid is promoted, and the response speed of the brake is improved.

An inward concave groove is formed in the end face, far away from the main push rod 33, of the first piston 31, and forms a hollow cavity 45 after contacting with the first leather cup 34, and the first push rod 43 is inserted into the hollow cavity 45. The end parts of the first leather cup 34 and the first piston 31 are provided with storage spaces, so that the effective fixed adsorption of the first leather cup and the first piston is realized, and the separation and falling off of the first leather cup and the first piston can be avoided. In the long-time use process of the first leather cup 34, due to the arrangement of the hollow cavity 45, the brake fluid is pushed to enable the structure, close to the hollow cavity 45, in the middle of the first leather cup 34 to be concave inwards, the shape and the structure between the first leather cup 34 and the end face of the first piston 31 are more matched, the connection tightness between the first leather cup and the first piston is improved, on the other hand, the edge of the concave part of the first leather cup 34 can be extended outwards due to the fact that the middle of the first leather cup 34 is concave inwards, the deformation is beneficial to the fact that the outer diameter of the first leather cup 34 is slightly increased in the use process, the first leather cup can be used for resisting the peripheral abrasion of the first leather cup 34 caused in the long-time use process, and the defects such as sealing failure can be prevented.

The brake master cylinder of the embodiment has strong sealing performance, the interior of the brake master cylinder realizes elastic connection between the first piston 31 and the second piston 32 through structures such as the matching piece 41, the auxiliary sleeve body 42 and the first return spring 37, the brake of an automobile can be realized under the condition that the first piston 31 or the second piston 32 fails, and the safety performance is high.

Example 2:

fig. 6 to 10 schematically show a brake master cylinder for a new energy vehicle according to another embodiment of the present invention, which is different from embodiment 1 in that:

the first piston 31 is internally provided with a reinforcing assembly which comprises a plate-shaped first reinforcing member 51 and an annular second reinforcing member 52, the second reinforcing member 52 is sleeved in the first reinforcing member 51 and is arranged concentrically with the first piston 31, and the first reinforcing member 51 is connected with the inner wall of the first piston 31.

The first and second reinforcing members 51 and 52 are made of a flexible sealing material of the same material as the first piston 31, and the material formulation may be different. A plurality of groups of reinforcing assemblies can be arranged in the first piston 31 along the axial direction of the first piston, so that the overall strength of the first piston is improved, and the probability of cracking and failure of the first piston in the long-time use process is reduced.

One end of the main push rod 33, which is far away from the first piston 31, penetrates through the front end part of the master cylinder 20, and the front end part of the master cylinder 20 is provided with a dust-proof assembly 60; the main push rod 33 is sleeved in the dustproof assembly 60. The dustproof assembly 60 is of a double-layer structure and comprises a first dustproof sleeve 61 arranged outside and a second dustproof sleeve 62 arranged inside, and the main push rod 33 is sleeved in the second dustproof sleeve 62.

The first dust-proof sleeve 61 is a funnel-shaped structure with openings at two ends, the outer surface is smooth and has no edges and corners and no barbs, the side wall of the first dust-proof sleeve is provided with a plurality of convex ridges 611 and a plurality of concave valleys 612, the convex ridges 611 and the concave valleys 612 are arranged at intervals, and folds are formed on the outer surface of the first dust-proof sleeve 61; the ridges 611 and the valleys 612 are curved in the same direction relative to the axis of the first dust boot 61, and a certain included angle is formed between two adjacent ridges 611. The corrugated structure forms a curved groove outside the first dust-proof sleeve 61, thereby facilitating the sliding of dust along the groove and preventing the accumulation of dust.

The outer wall of the second dust-proof sleeve 62 is provided with a plurality of strip-shaped reinforcing ribs 63 protruding outwards in a surrounding manner, the strip-shaped reinforcing ribs 63 are arranged in one-to-one correspondence with the valleys 612 and have the same bending trend as the valleys 612, and the inner wall positions corresponding to the valleys 612 are adhered to the strip-shaped reinforcing ribs 63. The outer wall of the second dust-proof sleeve 62 is provided with an annular reinforcing rib 64, and the annular reinforcing rib 64 and the strip-shaped reinforcing rib 63 are in cross connection. An annular rib 64 is also provided to protrude outward and is connected to the inner wall of the first dust boot 61. In this way, the strip-shaped ribs 63 and the annular ribs 64 form a space having a gap between the first dust boot 61 and the second dust boot 62, and when the dust boot 60 contracts, the shape of the space can be changed accordingly, thereby promoting the dust particles and the like that may adhere to the dust boot 60 to fall off.

An adjusting assembly is arranged inside the second dustproof sleeve 62 and comprises two adjusting rings 65 which are arranged concentrically, a certain interval gap is reserved between the two adjusting rings 65, and the main push rod 33 is sequentially inserted into the two adjusting rings 65; a plurality of elastic rings 66 are arranged between the two adjusting rings 65, and the plurality of elastic rings 66 are uniformly distributed around the main push rod 33. The body of the elastic ring 66 is connected with the left and right adjusting rings 65. A rubber rod 67 is arranged between the inner side of the elastic ring 66 and the outer wall of the main push rod 33 in a surrounding mode, and the rubber rod 67 is annular and is in contact with the main push rod 33. During the operation of the main push rod 33, the adjusting ring 65, the elastic ring 66, the rubber rod 67, etc. can clean the surface of the main push rod 33.

The end of the brake master cylinder is provided with the dustproof assembly 60, so that the internal assembly is prevented from being interfered by dust, the brake sensitivity is high, and the service life is long.

Example 3

Fig. 11 schematically shows a brake master cylinder for a new energy vehicle according to still another embodiment of the present invention, which is different from example 1 in that:

the first leather cup 34, the second leather cup 35 and the auxiliary leather cup 36 are connected with the first piston 31 and/or the second piston 32 through fastening nails; thereby, the sealing performance can be improved. The fastening nail comprises a screw rod 71 and a nut 72 which are fixedly connected, and the screw rod 71 is provided with a conical thread 73.

Therefore, the structure of the conical thread 73 can improve the connection stability between the first leather cup 34, the second leather cup 35 and the auxiliary leather cup 36 and the first piston 31 and/or the second piston 32, and effectively prevent the first leather cup and the second leather cup from falling off.

The embodiments described above are intended to illustrate the technical solutions of the present invention in detail, and it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modification, supplement or similar substitution made within the scope of the principles of the present invention should be included in the protection scope of the present invention.