A hydraulic booster assembly device with pre-charging function

Abstract

The present invention relates to the technical field of power-assisting devices applied to automobile brake systems, and in particular to a hydraulic booster assembly device with a pre-charging function. A pre-charging mechanism with a pre-charging function is added on the basis of a traditional hydraulic booster assembly device, and the pre-charging mechanism includes a pre-charging piston. At the beginning, high hydraulic pressure does not directly push the power-assisting piston to move to achieve power-assisting, but first pre-charges the pre-charging piston with pressure to push the brake master cylinder, thereby eliminating the idle stroke of the brake master cylinder. After the pre-charging piston moves to the pre-charging stroke, the power-assisting piston assembly starts to move, thereby ensuring that the brake master cylinder continuously builds pressure. The hydraulic booster assembly device with a pre-charging function of the present invention effectively reduces the idle stroke of the hydraulic booster assembly, thereby greatly improving the braking foot feel. The available power-assisting stroke is increased, thereby making the structure more compact, thereby satisfying the matching of the brake master cylinder with different stroke requirements. Meanwhile, the basic braking characteristics are not changed, and the system can be applied to full-system brake boosting.

Description

Technical Field

[0001] The invention relates to the technical field of booster devices applied to automobile brake systems, and in particular to a hydraulic booster assembly device with a pre-charging function. Background Art

[0002] The hydraulic booster is a hydraulic booster servo device, and is used in conjunction with the vehicle's brake system. Its working principle is to control the pressure input of the attached high hydraulic energy storage device by controlling the mechanical slide valve structure, thereby driving the booster piston of the hydraulic booster to move, thereby driving the piston of the brake master cylinder assembly to build pressure in the brake master cylinder, and output pressure to the brake actuator of the vehicle through the brake master cylinder oil outlet to achieve braking.

[0003] During braking, the traditional hydraulic booster must first overcome the idle stroke of the hydraulic booster itself, and then overcome the idle stroke of the brake master cylinder. The total idle stroke is relatively large, which affects the pedal feel. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a hydraulic booster assembly device with a pre-charging function. The pre-charging function is achieved by adding components such as a pre-charging piston, which can not only achieve the braking effect and excellent pedal feel under normal circumstances, but also achieve a faster braking response speed, a shorter braking distance, and a more compact structure, which can meet the matching of brake master cylinders with different stroke requirements.

[0005] The present invention achieves this object through the following technical solutions:

[0006] A hydraulic booster assembly device with a pre-charging function, comprising:

[0007] The main cylinder housing includes two cylinder holes of different diameters in the middle, wherein the diameter of the front cylinder hole is smaller than that of the rear cylinder hole, the front cylinder hole is connected to an oil return hole, and the rear cylinder hole is connected to a high hydraulic pressure inlet;

[0008] A brake master cylinder assembly is arranged at the front end of the master cylinder housing;

[0009] A sealing seat, arranged at the rear end of the master cylinder housing;

[0010] The booster piston assembly is arranged in the above two sections of cylinder holes, and is precisely matched with the inner cavity of the master cylinder housing to form a high-pressure chamber. The booster piston assembly is limited by the sealing seat. One end of the booster piston assembly abuts against the brake master cylinder assembly, and the other end extends from the master cylinder housing and is connected to the brake pedal. The master cylinder housing and the brake master cylinder assembly are surrounded to form a normal pressure chamber e;

[0011] The booster piston assembly comprises:

[0012] The booster piston, the booster piston, the sealing seat and the main cylinder housing are surrounded to form a booster chamber c, the interior of the booster piston is divided into a front chamber and a rear chamber, the rear chamber is provided with a slide rod precisely matched with the booster piston and a first return spring sleeved on the front end of the slide rod, the booster piston and the slide rod are precisely matched to form a mechanical slide valve sealing assembly, the first return spring is arranged between the inner end face of the booster piston and the end face of the slide rod, a countersunk hole is arranged at the end face of the front chamber of the booster piston, the booster piston assembly also includes a pre-charging mechanism, the pre-charging mechanism includes a pre-charging piston arranged in the rear chamber of the booster piston, a proportional rod and a pre-charging piston for connecting the countersunk hole and the booster chamber c The oil filling channel, the pre-filling piston, the power-assisting piston and the master cylinder housing are surrounded to form a pre-filling chamber d, a center valve top rod passes through the pre-filling oil channel, an oil hole is provided between the pre-filling oil channel and the mechanical sliding valve sealing assembly, the front end of the pre-filling piston abuts against the brake master cylinder assembly, a second return spring is provided in the countersunk hole, one end of the second return spring abuts against the center valve top rod, and the other end is limited by a spring limit plate, an oil gap is formed between the center valve top rod and the end face of the countersunk hole, one end of the proportional rod is clamped in the rear cavity of the power-assisting piston, there is a feedback gap with the sliding rod, and the other end extends into the inner cavity of the pre-filling piston.

[0013] Furthermore, a limiting groove is provided on the front inner side wall of the front cavity, a first retaining ring for limiting the axial movement of the pre-filling piston is provided in the limiting groove, and a pre-top stroke is provided between the first retaining ring and the end surface of the pre-filling piston.

[0014] Furthermore, seals are provided at the joints between the outer diameter of the booster piston and the sealing seat and the main cylinder housing, seals are provided at the joints between the sealing seat and the main cylinder housing, and seals are provided at the joints between the inner diameter of the booster piston and the pre-filling piston and the proportional rod.

[0015] Furthermore, a third return spring for returning the proportional rod is sleeved on the outer side of the proportional rod.

[0016] Furthermore, a rear end surface of the slide rod is in contact with an operating rod, and the operating rod is connected to a fork head for connecting with a brake pedal.

[0017] Furthermore, the booster piston is provided with a pressure relief channel connected to the normal pressure chamber e, and the pressure relief channel forms a certain angle with the axial direction of the booster piston.

[0018] Furthermore, the high-pressure chamber includes a high-pressure chamber a formed by a main cylinder housing and a booster piston, and a high-pressure chamber b formed by a booster piston and a sliding rod. The high-pressure chamber a is connected to the high pressure of the power source through a high hydraulic inlet. The high-pressure chamber a is connected to the high-pressure chamber b. The mechanical sliding valve sealing assembly includes a first sealing section, a second sealing section and a valve port. The first sealing section is the idle stroke of the hydraulic booster chamber itself. When not working, the first sealing section and the valve port are located in front of the high-pressure chamber b, and the second sealing section is located behind the high-pressure chamber b. The high-pressure chamber a is isolated from the booster chamber c and the normal-pressure chamber e by the first sealing section and the second sealing section. The booster chamber c and the pre-filling chamber d are connected to the normal-pressure chamber e through the valve port.

[0019] Furthermore, a second retaining ring for limiting the backward sliding of the sealing seat is arranged behind the rear end cylinder hole of the master cylinder housing.

[0020] Furthermore, the brake master cylinder assembly includes a master cylinder body and a first piston and a second piston arranged inside the master cylinder body. The master cylinder body is connected to the master cylinder housing, the first piston abuts against the pre-filled piston, a first spring is arranged between the first piston and the second piston, a second spring is arranged between the second piston and the front end of the inner cavity of the master cylinder housing, a main leather cup and a secondary leather cup are respectively arranged at the connection between the first piston, the second piston and the inner wall of the master cylinder body, and the first piston and the second piston are respectively provided with a fluid filling hole connected to the main leather cup.

[0021] Furthermore, the diameter of the pre-filling piston and the diameter of the front end of the proportional rod are used as adjustment dimensions for the power assist ratio.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] The hydraulic booster assembly device with a pre-charging function of the present invention realizes the pre-charging function by adding components such as a pre-charging piston, a center valve top rod, and a proportional rod, thereby solving the problem that the traditional hydraulic booster assembly first overcomes its own idle stroke and then overcomes the total idle stroke caused by the idle stroke of the master cylinder, effectively reducing the idle stroke and improving the braking feel; the boosting stroke of the hydraulic booster assembly is increased, solving the problem that the boosting axial space is too large due to the long stroke requirement of the brake master cylinder, making the hydraulic booster assembly device more compact and able to match brake master cylinders with different stroke requirements; the basic braking characteristics are not changed, and the vacuum booster can be completely replaced, and can be used for a full range of automotive brake boosters. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic cross-sectional structure diagram of a hydraulic booster assembly device with a pre-charging function according to the present invention.

[0025] Figure 2 It is a schematic cross-sectional structure diagram of the booster piston assembly of the present invention.

[0026] Figure 3 It is a schematic cross-sectional structure diagram of the present invention when the hydraulic booster eliminates the idle stroke of the brake master cylinder through pre-charging.

[0027] Figure 4 It is a schematic cross-sectional structure diagram of the present invention when the hydraulic booster increases the boost stroke through pre-charging.

[0028] Figure 5 It is a schematic diagram of the cross-sectional structure of the present invention in a braking balance state.

[0029] Figure numerals: 1.1-brake pedal, 1.2-fork head, 1.3-operating lever, 1.4-dust cover, 1.5-boosting master cylinder housing, 1.6-sealing seat, 1.7-second retaining ring, 1.8-seal, 1.9-seal, 1.10-seal, 1.11-power source, 1.12-boosting piston, 1.13-center valve top rod, 1.14-second return spring component, 1.15-seal, 1.16-seal, 1.17-sliding rod, 1.18-first return spring component, 1.19-seal, 1.20-spring limiter, 1.21-third return spring component, 1.22-proportional rod, 1.23 -First retaining ring, 1.24-pre-charge piston, 2.1-first piston, 2.2-secondary leather cup, 2.3-main leather cup, 2.4-main cylinder, 2.5-first spring, 2.6-second piston, 2.7-second spring, 4-high-pressure chamber a, 5-high-pressure chamber b, 6-boosting chamber c, 7-pre-charge chamber d, 8-normal-pressure chamber e, M1-first sealing section, M2-valve port, M3-second sealing section, M4-boosting piston slope, H1-oil return hole, H2-fluid filling hole, H3-pressure relief channel, H4-pre-charge oil channel, P1-high hydraulic inlet, L1-pre-top stroke, L2-oil clearance, L3-boosting stroke, L7-feedback clearance. DETAILED DESCRIPTION

[0030] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Example 1.

[0032] like Figure 1-2 As shown, this embodiment provides a hydraulic booster assembly device with a pre-charging function, including:

[0033] The master cylinder housing 1.5 includes two cylinder holes of different diameters in the middle, the diameter of the front cylinder hole is smaller than that of the rear cylinder hole, the front cylinder hole is connected to an oil return hole H1, and the rear cylinder hole is connected to a high hydraulic pressure inlet P1, a mounting hole is provided behind the rear cylinder hole for installing a sealing seat 1.6, and a brake master cylinder mounting hole is provided in front of the front cylinder hole for connecting the brake master cylinder assembly;

[0034] The booster piston assembly is arranged in the above two sections of cylinder holes, and is precisely matched with the inner cavity of the master cylinder housing 1.5 to form a high-pressure chamber, which is limited by the sealing seat 1.6. One end of the booster piston assembly abuts against the brake master cylinder assembly, and the other end extends from the master cylinder housing 1.5 and is connected to the brake pedal, and is surrounded by the master cylinder housing 1.5 and the brake master cylinder assembly to form a normal pressure chamber e8;

[0035] The booster piston assembly includes a booster piston 1.12, the booster piston 1.12, a sealing seat 1.6 and a main cylinder housing 1.15 are surrounded to form a booster chamber c6, the booster piston 1.12 is divided into a front chamber and a rear chamber, the rear chamber is provided with a slide rod 1.17 precisely matched with the booster piston 1.12 and a first return spring 1.18 sleeved on the front end of the slide rod 1.17, the booster piston 1.12 and the slide rod 1.17 are precisely matched to form a mechanical slide valve sealing assembly, and the opening and closing of the high-pressure chamber and the normal-pressure chamber are controlled by relative displacement;

[0036] The first return spring 1.18 is arranged between the inner end surface of the booster piston 1.13 and the end surface of the slide rod 1.17, and a countersunk hole is arranged at the end surface of the front cavity of the booster piston;

[0037] The booster piston assembly also includes a pre-filling mechanism, which includes a pre-filling piston 1.24 arranged in the rear chamber of the booster piston 1.12, a proportional rod 1.22, and a pre-filling oil passage H4 for connecting the counterbore and the booster chamber c6. The pre-filling piston 1.24, the booster piston 1.12 and the main cylinder housing are surrounded to form a pre-filling chamber d7. A central valve top rod 1.13 runs through the pre-filling oil passage H4. An oil passage hole is provided between the pre-filling oil passage H4 and the mechanical slide valve sealing assembly. The cooperation between the two realizes the on-off of the booster chamber c6, the pre-filling chamber d7 and the high-pressure chamber and the normal-pressure chamber e8.

[0038] The front end of the pre-filling piston 1.24 abuts against the brake master cylinder assembly, and a second return spring 1.14 is arranged in the countersunk hole. One end of the second return spring 1.14 abuts against the center valve top rod 1.13, and the other end is limited by the spring limit plate 1.20. An oil-passing gap L2 is formed between the center valve top rod 1.13 and the end surface of the countersunk hole, thereby realizing the connection between the power-assisting chamber c6 and the pre-filling chamber d7. One end of the proportional rod 1.22 is clamped in the rear cavity of the power-assisting piston 1.12, and there is a feedback gap L7 with the slide rod 1.17, and the other end extends into the inner cavity of the pre-filling piston 1.24.

[0039] Compared with the traditional booster piston assembly without the pre-charging function, the hydraulic booster assembly device with the pre-charging function of the present invention adds a pre-charging mechanism to the booster piston assembly structure to realize the pre-charging function, which solves the problem that the traditional hydraulic booster assembly first overcomes its own idle stroke and then overcomes the total idle stroke caused by the idle stroke of the master cylinder, effectively reduces the idle stroke and improves the braking feel; increases the boosting stroke of the hydraulic booster assembly, solves the problem that the boosting axial space is too large due to the long stroke requirement of the brake master cylinder, makes the hydraulic booster assembly device structure more compact and can match the brake master cylinder with different stroke requirements; the basic braking characteristics are not changed, and the vacuum booster can be completely replaced, and can be used for a full range of automotive brake boosters.

[0040] Among them, in order to ensure the sealing performance of the abutment between the booster piston 1.12, the pre-filling piston 1.24, the sealing seat 1.16, the proportional rod 1.22 and the master cylinder housing 1.5, seals 1.8 (1.9, 1.15) are respectively provided at the abutment between the outer diameter of the booster piston 1.12 and the sealing seat 1.16 and the master cylinder housing 1.5, a seal 1.16 is provided at the abutment between the inner diameter of the booster piston 1.12 and the pre-filling piston 1.24, and a seal 1.19 is provided at the abutment between the booster piston 1.12 and the proportional rod 1.22. The seals and corresponding components are together arranged to form different cavities.

[0041] Among them, a limiting groove is provided on the front inner side wall of the front cavity of the booster piston 1.12, and a first retaining ring 1.23 is provided in the limiting groove for limiting the axial movement of the pre-filling piston 1.24 to prevent the pre-filling piston 1.24 from moving forward without restriction and causing the device to lose control. A pre-top stroke L1 is provided between the first retaining ring 1.23 and the end face of the pre-filling piston 1.24, and this pre-top stroke L1 serves as an adjustment dimension of the pre-filling stroke of the pre-filling piston. After the pre-filling of the pre-filling piston stops, the center valve push rod 1.13 moves in the opposite direction under the action of the resistance of the second return spring member 1.14, closes the pre-filling chamber d7, and forms a sealed space to ensure the stability of the subsequent pressure building stability curve.

[0042] A hydraulic booster with a pre-charging mechanism can preferentially eliminate the idle stroke of the master cylinder by moving the pre-charging piston 1.24 forward to achieve a pre-stroke L1 only when the hydraulic booster overcomes its own critical idle stroke, thereby achieving synchronous elimination of the idle stroke of the hydraulic booster itself and the idle stroke of the brake master cylinder, fundamentally solving the problem of large total idle stroke of the traditional hydraulic booster assembly, and thus improving the pedal feel.

[0043] Among them, a third return spring 1.21 is provided on the outer side of the proportional rod 1.22 for returning the proportional rod 1.22. The resistance of the third return spring 1.21 can be adjusted according to demand. The feedback gap L7 between the rear end surface of the proportional rod 1.22 and the front end surface of the slide rod 1.17 can also be adjusted by the slide rod 1.17. The resistance of the third return spring 1.21 and the size of the feedback gap L7 jointly determine the change of the jump value.

[0044] The diameter of the pre-filling piston and the diameter of the front end of the proportional rod are used as adjustment dimensions for the assist ratio.

[0045] The rear end surface of the slide rod 1.17 abuts against an operating rod 1.3, the operating rod 1.3 is connected to a fork head 1.2, and the fork head 1.2 is connected to the brake pedal 1.1.

[0046] Among them, the booster piston is provided with a pressure relief channel H3 connected to the normal pressure chamber e8. The pressure relief channel H3 forms a certain angle with the axial direction of the booster piston, and through cooperation with the mechanical sliding valve sealing assembly, the normal pressure chamber e8 and the booster chamber c6 and the pre-filling chamber d7 are opened and closed.

[0047] Among them, the high-pressure chamber includes a high-pressure chamber a4 formed by the main cylinder housing 1.5 and the boosting piston 1.12 and a high-pressure chamber b5 formed by the boosting piston 1.12 and the sliding rod 1.17. The high-pressure chamber a4 and the high-pressure chamber b5 are communicated with each other. The mechanical sliding valve sealing assembly includes a first sealing section M1, a second sealing section M3 and a valve port M2. The first sealing section M1 is the idle stroke of the hydraulic boosting chamber itself. When not working, the first sealing section M1 and the valve port M2 are located in front of the high-pressure chamber b5, and the second sealing section M3 is located behind the high-pressure chamber b5. The high-pressure chamber a4 is isolated from the boosting chamber c6 and the normal pressure chamber e8 by the first sealing section M1 and the second sealing section M3. The boosting chamber c6 and the pre-filling chamber d7 are communicated with the normal pressure chamber e8 through the valve port M2.

[0048] Wherein, a second retaining ring 1.7 for limiting the backward sliding of the sealing seat 1.6 is arranged behind the rear end cylinder hole of the master cylinder housing 1.5.

[0049] Among them, the brake master cylinder assembly includes a master cylinder body 2.4 and a first piston 2.1 and a second piston 2.6 arranged inside the master cylinder body. The master cylinder body 2.4 is connected to the master cylinder housing 1.5. The first piston 2.1 abuts against the pre-filling piston 1.24. A first spring 2.5 is arranged between the first piston 2.1 and the second piston 2.6. A second spring 2.7 is arranged between the second piston 2.6 and the front end of the inner cavity of the master cylinder housing. A main leather cup 2.3 and a secondary leather cup 2.2 are respectively arranged at the connection between the first piston 2.1, the second piston 2.6 and the inner wall of the master cylinder body 2.4. The first piston 2.1 and the second piston 2.6 are respectively provided with a fluid replenishment hole H2 connected to the main leather cup 2.3. In the working state, the fluid replenishment hole H2 can be sealed by the main leather cup 2.3, thereby eliminating the first cavity idle stroke K2 and the second cavity idle stroke K3 of the automatic master cylinder assembly.

[0050] The working principle of the hydraulic booster assembly device with pre-charging function of the present invention is as follows:

[0051] like Figure 1 and Figure 2 As shown, in the non-working state, the high-pressure chamber a4 and the high-pressure chamber b5 formed by the master cylinder housing 1.5 and the booster piston assembly are high-pressure areas, and the first sealing section M1 (the length of this section is K1, which is the idle stroke of the hydraulic booster itself), the second sealing section M3, the seal 1.9, and the seal 1.15 formed by the precise matching of the slide rod 1.17 and the rear chamber of the booster piston 1.12 realize isolation from the booster chamber c6 and the normal pressure chamber e8; when not working, the booster piston inclined surface M4 is subjected to the liquid pressure of the high-pressure chamber a4, causing the booster piston assembly to be close to the sealing seat 1.6, and the sealing seat 1.6 is limited by the second retaining ring 1.7. The assisting chamber c6 and the pre-filling chamber d7 are connected to the normal pressure chamber e8 through the opened valve port M2; the operating lever 1.3, the slide rod 1.17 and other components are in the original position and do not generate assisting force due to the resistance of the first return spring 1.18; the proportional rod 1.22 is in the original position under the resistance of the third return spring 1.21, and there is a feedback gap L7 between the rear end face of the proportional rod 1.22 and the front end face of the slide rod 1.17.

[0052] like Figure 3As shown, when working, the driver steps on the brake pedal, the pedal force F and the displacement are transmitted to the fork head 1.2, and the starting resistance of the first return spring 1.18 is overcome through the operating lever 1.3 and the slide bar 1.17, and the idle stroke K1 of the hydraulic booster assembly itself is eliminated. At this time, the first sealing section M1 (just opened) is opened, so that the high-pressure chamber a4, the high-pressure chamber b5 and the booster chamber c6 and the pre-filling chamber d7 are connected, and the valve port M2 is closed at the same time to isolate the high-pressure chamber a4 from the normal-pressure chamber e8, so as to ensure that the high pressure does not leak into the normal-pressure chamber e8; through the opened first sealing section M1, the high pressure of the power source 1.11 is separated in the direction of the arrow through the opened first sealing section M1. The boosting chamber c6 and the pre-filling chamber d7 are pressurized separately; the hydraulic pressure of the pre-filling chamber d7 overcomes the friction resistance of the seal 1.16 and the resistance of the second spring 2.7 and starts to move from a stationary state, pushing the brake master cylinder piston to move axially; for the boosting piston 1.12, due to the friction resistance of its own seals 1.9 and 1.15, the reaction force of the hydraulic pressure of the high-pressure chamber a4 on the main piston inclined surface M4 and the resistance of the first spring 2.7 of the brake master cylinder, the hydraulic pressure in the boosting chamber c6 does not reach the threshold value that prompts the boosting piston assembly to move from a stationary state, ensuring that the pre-filling piston 1.24 moves before the boosting piston 1.12, ensuring the realization of the pre-filling function.

[0053] When the pre-charge piston 1.24 moves to L4, the lip of the main leather cup 2.3 seals the two fluid replenishment holes H2 of the piston, eliminating the idle stroke K2 of the first chamber and the idle stroke K3 of the second chamber of the brake master cylinder. This solves the problem that during the braking process of the traditional hydraulic booster, the hydraulic booster must first overcome its own idle stroke K1, and then the high pressure pushes the booster piston assembly to move and overcome the resistance of the brake master cylinder piston, thereby eliminating the idle stroke K2 and K3 of the brake master cylinder, in order to achieve the establishment of the pressure building gate valve. The pre-mechanism greatly reduces the idle stroke of the hydraulic booster assembly and improves the pressure building efficiency.

[0054] By adding the above-mentioned pre-charging structure to the hydraulic booster, the idle stroke of the master cylinder can be eliminated preferentially through the pre-charging piston 1.24 only when the hydraulic booster overcomes its own critical idle stroke K1, thereby achieving synchronous elimination of the idle stroke of the hydraulic booster itself and the idle stroke of the brake master cylinder, fundamentally solving the problem of large total idle stroke of the traditional hydraulic booster assembly, and thus improving the pedal feel.

[0055] like Figure 4 As shown, after eliminating the idle strokes K2 and K3 of the brake master cylinder, as the pedal force F increases, the opening of the first sealing section M1 increases to L5, and the high pressure is quickly added to the pre-filling chamber d7. The pre-filling piston 1.24 continues to push the first piston 2.1 and the second piston 2.6 to build up pressure. When the end face M5 of the pre-filling piston 1.24 moves to the retaining ring 1.23, the pre-filling piston 1.24 stops at the pre-top, and the first retaining ring 1.23 plays a limiting role. At the same time, the pre-filling piston 1.24 reaches the designed pre-filling stroke L1.

[0056] When the pre-fill piston 1.24 reaches the designed pre-fill stroke L1, the hydraulic pressure in the power-assisting chamber e acting on the effective area of ​​the power-assisting piston assembly reaches the threshold value to overcome the resistance that hinders movement. The hydraulic pressure in the power-assisting chamber c6 quickly pushes the power-assisting piston assembly forward to continue to push the brake master cylinder piston to build pressure.

[0057] When the movement distance of the booster piston assembly reaches L6, the center valve push rod 1.13 moves in the opposite direction with the booster piston 1.12 under the resistance of the second return spring 1.14, eliminating the oil gap L2, and the pre-filling chamber d7 forms a closed space, so that when the booster piston 1.12 moves, the pre-filling piston 1.24 is not pushed back by the reaction force of the brake master cylinder, ensuring the stability of the output pressure of the brake master cylinder; with the increase of input force and displacement, the stroke required for the subsequent pressure building of the brake master cylinder is guaranteed by the booster stroke L3 of the booster piston assembly itself. By adding the pre-filling function of the pre-filling piston 1.24, the problem of insufficient full stroke of the hydraulic booster caused by the compact space requirement is solved, so that the full stroke of the hydraulic booster assembly is composed of the boosting stroke L3 provided by the booster piston 1.12 and the stroke L1 of the pre-filling piston 1.24, which can meet the matching of the brake master cylinder with different stroke requirements.

[0058] like Figure 5 As shown, as the feedback force of the brake master cylinder increases, the liquid pressure in the pre-fill chamber d7 gradually increases, so that the hydraulic feedback force in the pre-fill chamber d7 acts on the cross-section of the proportional rod 1.22, pushing the proportional rod 1.22 to overcome the third return spring 1.21 and move toward the rear end to push backward, eliminating the feedback gap L7 between the proportional rod 1.22 and the slide rod 1.17, and the feedback force is transmitted to the operating lever 1.3 through the slide rod 1.17. When the input force remains stationary, the hydraulic feedback force acting on the proportional rod 1.22 will push the slide rod 1.17 back, the valve port M2 is closed, but the second sealing section M3 is not opened, and a balanced state is reached.

[0059] When the force F acting on the brake pedal is released, the slide rod 1.17 will return to its original position under the action of the first return spring 1.18, and the first sealing section M1 will be closed first, so that the high-pressure chamber a4 and the boosting chamber c6 are isolated; then the valve port M2 opens, and the hydraulic pressure of the boosting chamber c6 enters the normal pressure chamber e8 through the valve port M2 and the pressure relief channel H3, and returns to the reservoir 3.1 through the oil return hole H1 to release the brake, and at the same time, the hydraulic feedback force of the high-pressure chamber a4 will act on the inclined surface M4 of the boosting piston 1.15 to quickly push the boosting piston assembly back to its original position.

[0060] Those skilled in the art should understand that the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of the present disclosure (including the claims) is limited to these examples; under the concept of the present invention, the technical features in the above embodiments or different embodiments can also be combined, and there are many other changes in different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A hydraulic booster assembly device with a pre-charging function, comprising: The main cylinder housing includes two cylinder holes of different diameters in the middle, wherein the diameter of the front cylinder hole is smaller than that of the rear cylinder hole, the front cylinder hole is connected to an oil return hole, and the rear cylinder hole is connected to a high hydraulic pressure inlet; A brake master cylinder assembly is arranged at the front end of the master cylinder housing; A sealing seat, arranged at the rear end of the master cylinder housing; The booster piston assembly is arranged in the above two sections of cylinder holes, and is precisely matched with the inner cavity of the master cylinder housing to form a high-pressure chamber. The booster piston assembly is limited by the sealing seat. One end of the booster piston assembly abuts against the brake master cylinder assembly, and the other end extends from the master cylinder housing and is connected to the brake pedal. The master cylinder housing and the brake master cylinder assembly are surrounded to form a normal pressure chamber e; Characterized in that the booster piston assembly comprises: A booster piston, the booster piston, the sealing seat and the main cylinder housing are surrounded to form a booster chamber c, the interior of the booster piston is divided into a front chamber and a rear chamber, the interior of the booster piston is provided with a slide rod precisely matched with the booster piston and a first return spring sleeved on the front end of the slide rod, the booster piston and the slide rod are precisely matched to form a mechanical slide valve sealing assembly, and the opening and closing of the high-pressure chamber and the normal-pressure chamber are controlled by relative displacement, the first return spring is arranged between the inner end face of the booster piston and the end face of the slide rod, a countersunk hole is arranged at the end face of the front chamber of the booster piston, and the booster piston assembly also includes a pre-filling mechanism, which includes a pre-filling piston arranged in the rear chamber of the booster piston, a proportional rod and a pre-filling oil passage for connecting the countersunk hole and the booster chamber c The pre-filling piston, the boosting piston and the main cylinder housing are surrounded to form a pre-filling chamber d, a central valve push rod runs through the pre-filling oil passage, an oil hole is provided between the pre-filling oil passage and the mechanical slide valve sealing assembly, and the mutual cooperation between the two realizes the on-off of the boosting chamber c, the pre-filling chamber d and the high-pressure chamber and the normal-pressure chamber e, the front end of the pre-filling piston abuts against the brake master cylinder assembly, a second return spring is provided in the counterbore, one end of the second return spring abuts against the central valve push rod, and the other end is limited by a spring limit plate, an oil gap is formed between the central valve push rod and the end surface of the counterbore, one end of the proportional rod is clamped in the rear cavity of the boosting piston, there is a feedback gap with the slide rod, and the other end extends into the inner cavity of the pre-filling piston; In the non-working state, the high-pressure chamber a and the high-pressure chamber b formed by the master cylinder housing and the booster piston assembly are high-pressure areas, and the first sealing section, the second sealing section, and the two sealing members formed by the precise matching of the slide rod and the booster piston rear chamber are isolated from the booster chamber c and the normal pressure chamber e; A limiting groove is arranged on the front inner side wall of the front cavity, a first retaining ring for limiting the axial movement of the pre-filling piston is arranged in the limiting groove, and a pre-lifting stroke is provided between the first retaining ring and the end surface of the pre-filling piston; The outer diameter of the booster piston is provided with seals at the joints with the sealing seat and the main cylinder housing, the sealing seat is provided with seals at the joints with the main cylinder housing, and the inner diameter of the booster piston is provided with seals at the joints with the pre-filling piston and the proportional rod.

2. The hydraulic booster assembly device with pre-charging function according to claim 1, characterized in that: The outer side of the proportional rod is sleeved with a third return spring for returning the proportional rod, and the resistance of the third return spring and the size of the feedback gap jointly determine the change of the jump value.

3. The hydraulic booster assembly device with pre-charging function according to claim 1, characterized in that: The rear end surface of the slide rod is in contact with an operating rod, and the operating rod is connected with a fork head for connecting with a brake pedal.

4. The hydraulic booster assembly device with pre-charging function according to claim 1, characterized in that: The booster piston is provided with a pressure relief channel connected to the normal pressure chamber e, and the pressure relief channel forms a certain angle with the axial direction of the booster piston.

5. The hydraulic booster assembly device with pre-charging function according to claim 1, characterized in that: The high-pressure chamber includes a high-pressure chamber a formed by the main cylinder housing and the boosting piston, and a high-pressure chamber b formed by the boosting piston and the sliding rod. The high-pressure chamber a is connected to the high pressure of the power source through the high hydraulic inlet P1. The high-pressure chamber a is connected to the high-pressure chamber b. The mechanical sliding valve sealing assembly includes a first sealing section, a second sealing section and a valve port. The first sealing section is the idle stroke of the hydraulic boosting chamber itself. When not working, the first sealing section and the valve port are located in front of the high-pressure chamber b, and the second sealing section is located behind the high-pressure chamber b. The high-pressure chamber a is isolated from the boosting chamber c and the normal-pressure chamber e by the first sealing section and the second sealing section. The boosting chamber c and the pre-filling chamber d are connected to the normal-pressure chamber e through the valve port.

6. The hydraulic booster assembly device with pre-charging function according to claim 1, characterized in that: A second retaining ring for limiting the backward sliding of the sealing seat is arranged behind the rear end cylinder hole of the master cylinder housing.

7. The hydraulic booster assembly device with pre-charging function according to claim 1, characterized in that: After the pre-filling of the pre-filling piston stops, the center valve push rod moves in the opposite direction under the action of the resistance force of the second return spring to close the pre-filling chamber d, thereby forming a sealed space.

8. The hydraulic booster assembly device with pre-charging function according to claim 1, characterized in that: The diameter of the pre-filling piston and the diameter of the front end of the proportional rod are used as adjustment dimensions for the power assist ratio.

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