A hydraulic booster assembly device with brake backup function

Abstract

The present invention relates to a power-assisting assembly device applied to an automobile braking system, and specifically to a hydraulic booster assembly device with a brake backup function. The hydraulic booster assembly device has two sets of sliding valve sealing structures arranged in series and a main energy storage pipeline and an auxiliary energy storage pipeline matched therewith. The hydraulic booster assembly device can release high hydraulic pressure in sequence as a power-assisting force to generate an output pressure having a linear corresponding relationship with the braking input operation amount, and provide the output pressure to the hydraulic brake for use. The hydraulic booster assembly device has a brake backup function, good power-assisting braking effect, improved safety, fast braking response speed, and short braking distance. The hydraulic booster assembly device can be extended to vehicles with a full load gross mass of less than 10,000 kg, thereby expanding the range of equipped vehicles. The hydraulic booster assembly device of the present invention is designed as a single output piston structure, with compact axial dimensions, simple structure, and easy assembly and arrangement. The braking characteristics are consistent with those of traditional vacuum boosters, and the braking foot feel is better. The hydraulic booster assembly device can be completely replaced, and can also replace part of the air brake.

Description

Technical Field

[0001] The invention relates to a booster assembly device applied to an automobile braking system, and in particular to a hydraulic booster assembly device with a brake backup function. Background Art

[0002] Over the past two decades, China's automobile industry has continued to develop rapidly. It was not until 2018 that automobile production and sales began to show negative growth, but the number of cars in use continued to grow, exceeding 200 million as early as 2017. Automobiles are one of the industries with relatively large carbon emissions. Carbon emissions occur both in the production process and in the use process. Among them, tail gas emissions are the main source of air pollution in large and medium-sized cities in China. The state's standards for automobile pollutant emission limits are becoming increasingly stringent.

[0003] On August 7, 2014, the Chinese government issued a policy announcement on exempting new energy vehicles from vehicle purchase tax, and introduced vehicle purchase subsidy policies, local license plate preferential policies and other forms to promote the continuous advancement of new energy vehicle technology and accelerate the promotion and application of new energy vehicles. On September 27, 2017, the "Parallel Management Measures for Passenger Vehicle Enterprise Average Fuel Consumption and New Energy Vehicle Credits" was officially released, further promoting the vigorous development of the new energy vehicle industry. According to data from the China Association of Automobile Manufacturers, in 2018, my country's new energy vehicle production and sales maintained rapid growth, with production and sales reaching 1.2705 million and 1.2562 million respectively, a year-on-year increase of 59.92% and 61.74%. Both passenger cars and commercial vehicles have been moving towards electrification. Electric vehicles are one of the fastest-growing new energy vehicles and have become an inevitable automotive development trend that gradually replaces traditional energy vehicles at this stage.

[0004] The engine of traditional energy vehicles can generate vacuum, which can provide a vacuum source for the vacuum booster, so the vacuum booster is the preferred brake booster device for passenger cars; but new energy vehicles are not equipped with engines, which is equivalent to the vacuum booster without a vacuum source, which limits the use of the vacuum booster.

[0005] In the prior art, passenger cars and some commercial vehicles (microvans / micro trucks) with a small total mass under full load can obtain the vacuum required by the vacuum booster by adding an electric vacuum pump. However, the electric vacuum pump makes a lot of noise when working, which makes it difficult to control the noise of the vehicle. The volume of the electric vacuum pump and the supporting parts such as the vacuum tank is also relatively large, which also makes it difficult to arrange the compact engine cavity. The cost of the electric vacuum pump is also not low, which also brings challenges to the cost control of the whole vehicle. At the same time, the rapid response speed of the vacuum booster is not good; the maximum boost output pressure is relatively small due to the vacuum degree of the vacuum source and the size of the vacuum booster, and the applicable vehicles are limited. It cannot be applied to some vehicles with a relatively large total mass under full load (such as commercial vehicles). At present, the air brake system used in these vehicles is relatively expensive. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a hydraulic booster assembly device with a brake backup function, which can sequentially open the high hydraulic pressure supplied by the auxiliary hydraulic source of two sets of parallel independent high-hydraulic energy storage pipelines as a booster, thereby generating an output pressure corresponding to the linear relationship between the brake input operation amount, and supplying it to the hydraulic brake in the braking system; the high hydraulic pressure range applied by the hydraulic booster assembly device can be adjusted according to actual applications, and can be suitable for vehicles with different full-load gross masses.

[0007] The present invention achieves this object through the following technical solutions:

[0008] A hydraulic booster assembly device with a brake backup function, comprising:

[0009] A master cylinder housing, the front end of which is closed, and the rear end of which is provided with an opening connected to the inner cavity thereof, wherein the master cylinder housing is provided with a rear high-pressure hydraulic output channel, a normal-pressure channel C0, a normal-pressure channel C1, a front high-pressure hydraulic output channel, a main high-pressure hydraulic input channel, and a secondary high-pressure hydraulic input channel connected to the inner cavity from front to back in sequence;

[0010] A brake piston assembly, wherein the brake piston assembly is slidably disposed at the front portion of the inner cavity of the master cylinder housing, and is precisely matched with the master cylinder housing to form a rear brake cavity, wherein the rear brake cavity is communicated with the rear high hydraulic pressure output channel;

[0011] A booster piston assembly, the booster piston assembly is slidably arranged at the rear part of the inner cavity of the master cylinder housing, and comprises a main piston, a sub-piston and an input rod slidably arranged in the main piston, the front end of the main piston abuts against the brake piston, the sub-piston is slidably sleeved on the rear part of the main piston, and the rear end of the input rod extends out from the inside of the master cylinder housing, the main piston and the input rod are precisely matched to form a main sliding valve sealing mechanism and a sub-sliding valve sealing mechanism, the main piston, the sub-piston and the master cylinder housing are respectively surrounded by a main booster chamber and a sub-boosting chamber at the front and rear of the sub-piston, the main piston and the input rod are surrounded by a sub-feedback chamber, the sub-feedback chamber is communicated with the sub-boosting chamber, one side of the main sliding valve sealing mechanism is communicated with the main booster chamber, and the other side is communicated with the main high hydraulic pressure input channel, one side of the sub-sliding valve sealing mechanism is communicated with the sub-boosting chamber, and the other side is communicated with the sub-high hydraulic pressure input channel;

[0012] The master piston and the master cylinder housing are surrounded to form a front brake chamber, the front brake chamber is communicated with the main boost chamber, and the front brake chamber is communicated with the front high hydraulic pressure output channel;

[0013] A feedback piston is slidably disposed at the front of the main piston, the main piston and the feedback piston are surrounded by a main feedback chamber, the main feedback chamber is communicated with the main boosting chamber, and a first return spring is disposed between the feedback piston and the input rod;

[0014] A high-pressure accumulator booster assembly includes a main energy storage pipeline and an auxiliary energy storage pipeline that are independent of each other, and the main energy storage pipeline and the auxiliary energy storage pipeline are respectively connected to a main high-pressure input channel and an auxiliary high-pressure input channel;

[0015] The fluid storage tank assembly includes three chambers and connection ports, which are respectively connected to the high hydraulic accumulator booster assembly, the booster piston assembly and the brake piston assembly;

[0016] A brake fluid reflux channel communicating with the normal pressure channel is provided through the interior of the input rod.

[0017] Furthermore, the action stroke of the main sliding valve sealing mechanism is smaller than the action stroke of the auxiliary sliding valve sealing mechanism.

[0018] Furthermore, the main sliding valve sealing mechanism includes a main pressure relief valve port, a main high-pressure valve port and a main normally closed valve port, an annular groove is provided on the input rod between the main high-pressure valve port and the main normally closed valve port as a main high-pressure channel, the auxiliary sliding valve sealing mechanism includes an auxiliary pressure relief valve port, an auxiliary high-pressure valve port and an auxiliary normally closed valve port, the input rod is provided with an axial shallow groove behind the auxiliary high-pressure valve port as a auxiliary high-pressure channel, and the action strokes of the main pressure relief valve port and the auxiliary pressure relief valve port are respectively smaller than the action strokes of the main high-pressure valve port and the auxiliary high-pressure valve port.

[0019] Furthermore, seals are respectively provided at the connection between the rear periphery of the main piston and the opening of the main cylinder housing, at the front and rear connection between the middle part and the secondary piston, at the connection between the front end and the main cylinder housing, and at the front and rear sides of the main high hydraulic input channel; seals are respectively provided at the periphery of the secondary piston and the front and rear sides of the secondary high hydraulic input channel; seals are provided at the connection between the inner cavity wall of the main piston and the rear end of the input rod, and at the connection between the feedback piston and the front and rear sides of the main feedback cavity.

[0020] Furthermore, the outer circles of the main piston and the auxiliary piston have two diameter sections, and the rear end diameter is larger than the front end diameter. The hydraulic force difference of the high hydraulic pressure can realize the backward hydraulic return force, so that the main piston and the auxiliary piston can quickly return to the initial position when the brake is released.

[0021] Furthermore, the brake piston assembly includes an output piston and a second return spring for helping the brake piston to retreat when the brake is released. One end of the output piston abuts against the main piston, and the other end abuts against the front end of the master cylinder housing through the second return spring. The second return spring is arranged in the rear brake chamber.

[0022] Furthermore, sealing members are respectively provided at the connection positions between the outer periphery of the output piston and the inner wall of the master cylinder housing at the front and rear sides of the normal pressure channel C0.

[0023] Furthermore, the main energy storage pipeline and the auxiliary energy storage pipeline share a set of hydraulic control components, or are each equipped with a separate set of hydraulic control components.

[0024] Preferably, the hydraulic control component includes a motor, a hydraulic pump and a controller respectively connected to the motor, and also includes a main hydraulic sensor and a secondary hydraulic sensor respectively connected to the main energy storage pipeline and the secondary energy storage pipeline. The main energy storage pipeline is respectively connected to the main accumulator A, the main hydraulic sensor and the hydraulic pump, the secondary energy storage pipeline is respectively connected to the secondary accumulator B, the secondary hydraulic sensor and the hydraulic pump, and the controller is respectively connected to the motor, the main hydraulic sensor and the secondary hydraulic sensor.

[0025] Furthermore, the end of the input rod is connected to a U-shaped fork head for connecting to a brake pedal.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] The hydraulic booster assembly device with a brake backup function of the present invention is provided with two sets of parallel main energy storage pipelines and auxiliary energy storage pipelines and a main slide valve sealing mechanism and an auxiliary slide valve sealing mechanism matched therewith, so that the hydraulic booster assembly device has a brake backup function, and has a better brake pedal feeling, a higher output pressure, a faster brake response speed, and a shorter braking distance than the existing vacuum booster; it has a higher output pressure, a better boosting effect, and is safer than an electric booster; it is safer after having an additional backup high hydraulic energy storage assistance than a single high hydraulic energy storage pipeline hydraulic booster, especially when the total mass of the full load is relatively large Vehicles; the braking system of the present invention has a smaller volume than that of the air brake, is easy to assemble and arrange, has relatively gentle braking, has a good brake pedal feel, and has advantages in terms of cost price; the hydraulic booster assembly device of the present invention can achieve the same braking effect as the vacuum booster and is better, and the braking parameters are also easy to match and adjust; at the same time, it is a single-chamber output piston structure with a small axial space size, a compact structure, and a small volume, which is very beneficial to the arrangement of machine cavity parts. In addition, the high hydraulic range of the hydraulic booster assembly device of the present invention can be adjusted according to actual applications, and is applied to passenger cars and commercial vehicles with a full load gross mass of less than 10,000 kg. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the cross-sectional structure of the present invention.

[0029] Figure 2 It is a schematic diagram of the cross-sectional structure of the main energy storage pipeline of the present invention in the working-releasing high hydraulic pressure state.

[0030] Figure 3 It is a schematic cross-sectional structure diagram of the main energy storage pipeline of the present invention in a working-braking balanced state.

[0031] Figure 4It is a schematic diagram of the cross-sectional structure of the main and auxiliary energy storage pipelines of the present invention in a working-braking balanced state.

[0032] Figure 5 It is a schematic cross-sectional structure diagram of the main energy storage pipeline working-braking balance state when the brake chamber fails in the present invention.

[0033] Figure 6 It is a schematic cross-sectional structure diagram of the auxiliary energy storage pipeline working-braking balance state when the main energy storage pipeline fails in the present invention.

[0034] Figure numerals: 1-U-shaped fork, 2-input rod, 3-primary piston, 4, 5-seal, 6-master cylinder housing, 7-secondary piston, 8, 9-seal, 10-first return spring, 11-seal, 12-feedback piston, 13-seal, 14-output piston, 15-second return spring, 16, 17-seal, 18-fluid reservoir, 19-hydraulic pump, 20-motor, 21-controller, 22-check valve, 23-primary accumulator A, 24a-primary hydraulic sensor, 24b-secondary hydraulic sensor, 25-secondary accumulator B, BB-secondary power-assisting chamber, AA-primary power-assisting chamber, QQ-front brake chamber, RR-rear brake Chamber, Q-front high hydraulic output channel, R-rear high hydraulic output channel; A1, A2, A3-main high hydraulic input channel, A4-A6 are channels for inputting into the main boosting chamber, A7-A8 are channels for inputting into the main feedback chamber, B1-B5 are channels for inputting into the auxiliary high hydraulic input channel, B6-B8 are channels for inputting into the auxiliary boosting chamber, C0-normal pressure channel C0, C1-normal pressure channel C1, C2-C8 are normal pressure channels; XK-output piston idle stroke, FA-main feedback chamber, FB-auxiliary feedback chamber, F1-main pressure relief valve port, F2-main high pressure valve port, F3-main normally closed valve port, F4-auxiliary normally closed valve port, F5-auxiliary high pressure valve port, F6-auxiliary pressure relief valve port. DETAILED DESCRIPTION

[0035] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] Example 1.

[0037] like Figure 1 As shown, this embodiment provides a hydraulic booster assembly device with a brake backup function, including: a master cylinder housing 6, a brake piston assembly, a booster piston assembly, a reservoir assembly 18 and a high hydraulic accumulator booster assembly, wherein the master cylinder housing 6 is provided with a rear high hydraulic output channel R, a normal pressure channel C0, a normal pressure channel C1, a front high hydraulic output channel Q, a main high hydraulic input channel A1, and a secondary high hydraulic input channel B1 which are connected to the inner cavity from front to back;

[0038] The brake piston assembly is slidably disposed at the front part of the inner cavity of the master cylinder housing 6, and is precisely matched with the master cylinder housing 6 to form a rear brake chamber RR, and the rear brake chamber RR is communicated with the rear high hydraulic pressure output channel R;

[0039] The booster piston assembly is slidably arranged at the rear part of the inner cavity of the master cylinder housing 6, and includes a main piston 3, a sub-piston 7 and an input rod 2 slidably arranged in the main piston 3, the end of the input rod 2 is connected with a U-shaped fork head 1, the front end of the main piston 3 abuts against the brake piston assembly, the sub-piston 7 is slidably sleeved on the rear part of the main piston 3, and the rear end of the input rod 2 extends out from the inside of the master cylinder housing 6, the main piston 3 and the input rod 2 are precisely matched to form a main slide valve sealing mechanism and a sub-slide valve sealing mechanism, the main piston 3, the sub-piston 7 and the master cylinder housing 6 are respectively surrounded by a main booster chamber AA and a sub-boost chamber BB in front and rear of the sub-piston 7, the main piston 3 and the input rod 2 are surrounded by a sub-feedback chamber FB, the sub-feedback chamber FB is connected with the sub-boost chamber BB, one side of the main slide valve sealing mechanism is connected with the main booster chamber AA, and the other side is connected with the main high hydraulic input channel A1, one side of the sub-slide valve sealing mechanism is connected with the sub-boost chamber BB, and the other side is connected with the sub-high hydraulic input channel B1;

[0040] The above-mentioned main piston 3 and the main cylinder housing 6 are surrounded to form a front brake chamber QQ, and the front brake chamber QQ is connected to the main booster chamber AA, and the front brake chamber QQ is connected to the front high hydraulic pressure output channel Q;

[0041] A feedback piston 12 is slidably disposed at the front of the main piston 3, the main piston 3 and the feedback piston 12 are surrounded to form a main feedback chamber FA, the main feedback chamber FA is connected to the main boost chamber AA, and a first return spring 10 is disposed between the feedback piston 12 and the input rod 2;

[0042] The above-mentioned high-pressure accumulator booster assembly comprises a main energy storage pipeline and an auxiliary energy storage pipeline which are independent of each other, and the main energy storage pipeline and the auxiliary energy storage pipeline are respectively connected to the main high-pressure input channel A1 and the auxiliary high-pressure input channel B1;

[0043] The above-mentioned storage tank assembly 18 for storing brake fluid includes three chambers and connecting ports, which are respectively connected to the high hydraulic accumulator booster assembly, the booster piston assembly, and the brake piston assembly;

[0044] A brake fluid reflux passage communicating with the normal pressure passage C1 is provided through the input rod 2 .

[0045] The hydraulic booster assembly device of the present invention is provided with two sets of parallel main energy storage pipelines and auxiliary energy storage pipelines and main slide valve sealing mechanisms and auxiliary slide valve sealing mechanisms matched therewith, so that the hydraulic booster assembly device has a brake backup function, has a better brake pedal feeling, a higher output pressure, a faster brake response speed, and a shorter braking distance than the existing vacuum booster; has a higher output pressure, a better boosting effect, and is safer than the electric booster; and is safer after having an additional backup high hydraulic energy storage assistance than the single high hydraulic energy storage pipeline hydraulic booster, especially for vehicles with a relatively large total mass when fully loaded; Compared with the air brake braking system, the supporting volume is smaller, the assembly and layout are convenient, the braking is relatively gentle, the brake pedal feel is good, and the cost price is advantageous; the hydraulic booster assembly device of the present invention can achieve the same braking effect as the vacuum booster and is better, and the braking parameters are also easy to match and adjust; at the same time, it is a single-chamber output piston structure with small axial space dimensions, compact structure, and small volume, which is very beneficial to the arrangement of machine cavity parts. In addition, the high hydraulic range of the hydraulic booster assembly device of the present invention can be adjusted according to actual applications, and is applied to passenger cars and commercial vehicles with a full load gross mass of less than 10,000 kg.

[0046] The action stroke of the main sliding valve sealing mechanism is smaller than the action stroke of the auxiliary sliding valve sealing mechanism, so that the main energy storage pipeline and the auxiliary energy storage pipeline can be opened in sequence.

[0047] The main slide valve sealing mechanism includes a main pressure relief valve port F1, a main high-pressure valve port F2 and a main normally closed valve port F3. An annular groove is provided on the input rod 2 between the main high-pressure valve port F2 and the main normally closed valve port F3 to form a main high-pressure channel. The auxiliary slide valve sealing mechanism includes an auxiliary pressure relief valve port F6, an auxiliary high-pressure valve port F5 and an auxiliary normally closed valve port F4. The main normally closed valve port F3 and the auxiliary normally closed valve port F4 are responsible for isolating the normal pressure area. The main pressure relief valve port F1 and the auxiliary pressure relief valve port F6 are responsible for the connection and disconnection of the main boosting chamber AA and the auxiliary boosting chamber BB with the normal pressure area respectively. The main high-pressure valve port F2 and the auxiliary pressure relief valve port F5 are responsible for the connection and disconnection of the main energy storage pipeline with the main boosting chamber AA and the auxiliary boosting chamber BB respectively. The main pressure relief valve port F1 and the auxiliary pressure relief valve port F6 are respectively smaller than the main high-pressure valve port F2 and the auxiliary high-pressure valve port F5, so that the main pressure relief valve port F1 and the auxiliary pressure relief valve port F6 can be closed first and then the main high-pressure valve port F2 and the auxiliary high-pressure valve port F5 can be opened, thereby first disconnecting the connection between the normal pressure area and the main power-assisting chamber AA and the auxiliary power-assisting chamber BB, and then opening the connection between the high-hydraulic accumulator power-assisting assembly and the main power-assisting chamber AA and the auxiliary power-assisting chamber BB. The input rod 2 is provided with an axial shallow groove behind the auxiliary high-pressure valve port F5 as the auxiliary high-pressure channel B6.

[0048] Among them, in order to ensure the sealing between the various connecting parts, a seal 5 is provided at the connection between the rear outer periphery of the main piston 3 and the opening of the main cylinder housing 6, a seal 9 is provided at the connection between the middle outer periphery and the secondary piston 7, a seal 8 is provided at the connection between the front end and the main cylinder housing 6, and seals 8 are respectively provided on the front and rear sides of the main high hydraulic input channel A1, the outer periphery of the secondary piston 7 is respectively provided with seals 8 on the front and rear sides of the secondary high hydraulic input channel B1, a seal 4 is provided at the connection between the rear end of the input rod 2 and the inner cavity wall of the main piston 3, and seals 11 and 13 are provided at the connection between the feedback piston 12 and the inner wall of the main piston 3.

[0049] Among them, the outer circles of the main piston 3 and the auxiliary piston 7 have two diameters, and the rear end diameter is larger than the front end diameter. The hydraulic force difference of high hydraulic pressure can achieve backward hydraulic return force, so that the main piston 3 and the auxiliary piston 7 can quickly return to the initial position when the brake is released.

[0050] Among them, the brake piston assembly includes an output piston 14 and a second return spring 15 for helping the brake piston 14 to retreat when the brake is released. One end of the output piston 14 abuts against the main piston 3, and the other end abuts against the front end of the master cylinder housing 6 through the second return spring 15. The second return spring 15 is arranged in the rear brake chamber RR. In order to ensure the sealing performance, the outer periphery of the output piston 14 and the inner cavity of the master cylinder housing 6 are respectively provided with seals 17 and 16 at the connection between the front and rear sides of the normal pressure channel C0. The hydraulic booster assembly device is a single brake piston assembly structure. The output of the other brake chamber is directly released by one of the above-mentioned high hydraulic accumulator pipelines through the sliding valve sealing mechanism to provide controllable hydraulic pressure, which saves an output piston and stroke, greatly reduces the axial space size, and makes the structure more compact and easier to assemble and arrange.

[0051] The main energy storage pipeline and the auxiliary energy storage pipeline may share a set of hydraulic control components, or may be separately equipped with a set of hydraulic control components to further improve safety.

[0052] Among them, the hydraulic control component includes a motor 20, a hydraulic pump 19 and a controller 21 respectively connected to the motor 20, and also includes a main hydraulic sensor 24a and an auxiliary hydraulic sensor 24b respectively connected to the main energy storage pipeline and the auxiliary energy storage pipeline. The main energy storage pipeline is respectively connected to the main accumulator A23, the main hydraulic sensor 24a and the hydraulic pump 19, the auxiliary energy storage pipeline is respectively connected to the auxiliary accumulator B25, the auxiliary hydraulic sensor 24b and the hydraulic pump 19 (or another hydraulic pump), and the controller 21 is respectively connected to the motor 20, the main hydraulic sensor 23 and the auxiliary hydraulic sensor 25.

[0053] The working principle of the hydraulic booster assembly device with braking function of the present invention is as follows:

[0054] like Figure 1 As shown, when not in operation, the driver does not step on the brake pedal, there is no input force F and displacement, under the assembly resistance of the first return spring 10, the U-shaped fork 1 and the input rod 2 are close to the rear end step of the main piston 3 and are in the original position, the main energy storage pipeline and the main boosting chamber AA, the auxiliary energy storage pipeline and the auxiliary boosting chamber BB are blocked by the main high-pressure valve port F2, the auxiliary high-pressure valve port F5 and the seals 8 and 9 respectively, the main energy storage pipeline and the normal pressure area (connecting the liquid storage tank assembly 18 and the channels C1-C4) are blocked by the main high-pressure valve port F2, the main normally closed valve port F3 and the seal 8, the auxiliary energy storage pipeline and the normal pressure area are blocked by the auxiliary high-pressure valve port F 5. The secondary normally closed valve port F4 and the seals 8 and 9 are blocked, while the main pressure relief valve port F1 and the secondary pressure relief valve port F6 are in the open state, so that the main power-assisting chamber AA, the front brake chamber QQ, and the secondary power-assisting chamber BB are connected to the normal pressure area, and the feedback piston 12 is close to the front end step of the main piston 3 under the resistance of the first return spring 10, and is in the original position; when there is no pressure-building assistance in the main power-assisting chamber AA and the secondary power-assisting chamber BB, the power-assisting piston assembly (including the main piston 3 and the secondary piston 7) will not move forward, but will be pushed backward by the output piston 14 under the resistance of the second return spring 15, and will be close to the step of the master cylinder housing 6.

[0055] like Figure 2 As shown, during operation, when the driver steps on the brake pedal, the pedal force F and displacement will be transmitted to the U-shaped fork 1, pushing the input rod 2. When the input force F is greater than the resistance f of the first return spring 10, the input rod 2 moves forward, the pressure relief valve port F1 is closed first, and then the high-pressure valve port F2 is opened. The hydraulic pressure of the main energy storage pipeline enters the channels A4-A6 of the input main power-assisting chamber through the main high-hydraulic input channel A1-A3, and smoothly enters the front brake chamber QQ and the main power-assisting chamber AA. Because the main piston 3 needs to overcome the resistance of the second return spring 15 at the front end of the output piston 14 to move forward, the high hydraulic pressure will first enter the brake of the front brake circuit through the front high-hydraulic output channel Q to eliminate the brake clearance before starting to build pressure and move forward.

[0056] like Figure 3 As shown, when the forward hydraulic force of the main power-assisting chamber AA after pressure buildup is greater than the resistance of the second return spring 15, the main piston 3 will push the output piston 14 forward to eliminate the idle stroke XK, and the hydraulic pressure of the rear brake chamber RR enters the brake of the rear brake circuit through the rear high hydraulic output channel R to eliminate the brake clearance and start to build pressure. After the pressure is built up, the output piston 14 has a backward hydraulic feedback force to resist the above-mentioned power-assisting piston assembly. At this time, the backward hydraulic feedback force fa of the feedback piston 12 will be able to overcome the resistance f of the first return spring 10 to move backward to limit the forward movement of the input rod 2; when the driver stabilizes the brake pedal and no longer applies force, the main piston 3 moves forward relative to the input rod 2 under the action of the hydraulic assist to close the main high-pressure valve port F2 and is in a braking balance state.

[0057] When the driver steps on the brake pedal harder, the input rod 2 moves forward again to open the main high-pressure valve port F2, releasing the high hydraulic power assist and building a higher hydraulic rebalancing.

[0058] When the driver releases the brake and releases the brake pedal, the input rod 2 will move backward without the pedal thrust F. The main high-pressure valve port F2 will be closed first (or closed when balanced) and then the main pressure relief valve port F1 will be opened. The hydraulic pressure of the main boosting chamber AA and the front brake chamber QQ will flow into the normal pressure channel C6-C1 through the channels A6 and A5 of the input boosting chamber and return to the reservoir assembly 18, and the boosting will be released. At the same time, the hydraulic pressure of the main feedback chamber FA will also be released through the input main feedback chamber channels A8-A7 and the input main boosting chamber channels A6-A4, and return to the original position under the resistance of the first return spring 10. After the main boosting chamber AA is depressurized, the output piston 14 will quickly move backward under the hydraulic feedback force of the rear brake chamber RR and the resistance of the second return spring 15, and the rear brake chamber RR and the brake hydraulic pressure will drop. The output piston 14 will move backward to open the idle stroke XK, and the brake fluid of the rear brake chamber RR and the brake will flow back to the reservoir assembly 18. The brake release process is completed and the brake will return to the initial non-working position.

[0059] like Figure 4 As shown, when the driver needs a higher output pressure during the braking process, the input pedal force F continues to be greater than the maximum power-assisting point input force of the main accumulator A23, that is, the input rod 2 continues to move forward, the secondary pressure relief valve port F6 will be closed first, and then the secondary high-pressure valve port F5 will open when it moves forward. The hydraulic pressure of the secondary accumulator pipeline enters the channel B6-B8 of the input secondary power-assisting chamber through the secondary high-hydraulic input channel B1-B5, and smoothly enters the secondary power-assisting chamber BB. The secondary piston 7 and the seals 8 and 9 participate in the power-assisting forward movement under the action of the hydraulic pressure, compressing the main power-assisting chamber AA to push the main piston 3 and the output piston 14 to continue to move forward to build a higher hydraulic pressure. At the same time, when the high hydraulic pressure enters the input secondary power-assisting chamber channel B7, the sealing diameter of the seal 4 on the input rod 2 is larger than the sealing diameter of the secondary normally closed valve port F4, and the input rod 2 will have an additional hydraulic feedback force fb backward, which limits the opening of the secondary high-pressure valve port F5. When the driver stabilizes the brake pedal and no longer applies force, the input rod 2 no longer moves forward under the action of the backward hydraulic feedback forces fa and fb, and the main piston 3 moves forward with power to close the secondary high-pressure valve port F5, which is in a balanced state.

[0060] When the driver steps on the brake pedal again, the input rod 2 will move forward again to open the secondary high-pressure valve port F5, release the high hydraulic power assist, and build a higher hydraulic pressure for rebalancing; until it exceeds the high hydraulic maximum power assist of the secondary energy storage pipeline, the input force F is greater than the maximum value of the above two hydraulic feedbacks and the combined force of the first return spring 10, the input rod 2 will continue to move forward, pressing the feedback piston 12 to push the main piston 3 forward, and push the output piston 14 forward to build a higher hydraulic pressure.

[0061] At this time, when the driver releases the brake and releases the brake pedal, the input rod 2 will retreat without the pedal thrust F, the secondary high-pressure valve port F5 will close first (or close when balanced), and the secondary pressure relief valve port F6 will open again, and the hydraulic pressure of the secondary boosting chamber BB will be released back to the reservoir 18 through the normal pressure channel C8 first; after the secondary boosting chamber BB begins to release pressure, the main piston 3 and the output piston 14 will compress the secondary boosting chamber BB under the action of the hydraulic force and the second return spring force 15, and the secondary piston 7 will retreat, and the front brake chamber QQ and the rear brake chamber RR will be closed. The hydraulic pressure will decrease; at the same time, the input rod 2 continues to retreat, the main high-pressure valve port F2 is closed first, and the main pressure relief valve port F1 is opened again. As in the above-mentioned release of the brake, the hydraulic pressure of the main boosting chamber AA and the front brake chamber QQ flows into the normal pressure channel C6-C1 through the input main boosting chamber channels A6 and A5 and returns to the reservoir 18, and the boost is released; at the same time, the hydraulic pressure of the main feedback chamber FA is also discharged through the input main feedback chamber channels A8-A7 and the input main boosting chamber channels A6-A4, and returns to the original position under the resistance of the first return spring 10. After the main boosting chamber AA is depressurized, the output piston 14 retreats quickly under the hydraulic feedback force of the rear brake chamber RR and the resistance of the second return spring 15, the rear brake chamber RR and the brake hydraulic pressure decrease, the output piston 14 retreats to open the idle stroke XK, the rear brake chamber RR and the brake fluid of the brake return to the reservoir assembly 18, the brake release process is completed, and it returns to the initial non-working position.

[0062] Brake backup function description:

[0063] (a) When the rear brake chamber RR fails

[0064] like Figure 5 As shown, when the driver steps on the brake pedal and the pedal input force F is greater than the resistance f of the first return spring 10, the input rod 2 moves forward, the main pressure relief valve port F1 is closed first, and then the main high-pressure valve port F2 is opened, and the hydraulic pressure of the main energy storage pipeline enters the input main power-assisting chamber channel A4-A6 through the main high-hydraulic input channel A1-A3, and smoothly enters the front brake chamber QQ and the main power-assisting chamber AA. Because the main power-assisting main piston assembly (including the main piston 3, etc.) needs to overcome the resistance of the second return spring 15 at the front end of the output piston 14 to move forward, the high hydraulic pressure will first enter the brake of the front brake circuit through the front high-hydraulic output channel Q to eliminate the brake clearance and start to build pressure. When the forward hydraulic force of the main power-assisting chamber AA is greater than the resistance of the second return spring 15, the output piston 14 is pushed forward and pressed directly to the bottom of the master cylinder housing 6. After the rigid force is applied, the front brake chamber QQ and the main power-assisting chamber AA are quickly pressurized, and the feedback piston 12 feedbacks as usual to limit the opening of the main high-pressure valve port F2, and balance can be achieved.

[0065] Compared with the normal good state, the braking process is equivalent to the main piston 3 moving one more rear brake chamber RR stroke, there is no rear brake chamber RR output hydraulic pressure, and the front brake chamber QQ output is the same as the normal state output, which is similar to the single-chamber failure of the traditional brake master cylinder.

[0066] (ii) When the current brake chamber QQ, main boost chamber AA or main energy storage pipeline fails

[0067] like Figure 6 As shown, when the driver steps on the brake pedal and the pedal input force F is greater than the resistance f of the first return spring 10, the input rod 2 moves forward, the main pressure relief valve port F1 is closed first, and then the main high-pressure valve port F2 is opened. The high hydraulic pressure enters the front output chamber QQ and the main power-assisting chamber AA and then fails to leak away, or there is no high hydraulic pressure release. As a result, the front brake cannot build pressure, and the feedback piston 12 will not have a backward feedback force fa; the input rod 2 continues to move forward, just like the auxiliary energy storage pipeline participates in the power-assisting, the auxiliary pressure relief valve port F6 will be closed first, and then the auxiliary high-pressure valve port F5 will be opened when it moves forward. The hydraulic pressure of the auxiliary energy storage pipeline enters the input auxiliary power-assisting chamber channel B6-B8 through the auxiliary high-hydraulic input channel B1-B5, and smoothly enters the auxiliary power-assisting chamber BB. The auxiliary power-assisting piston assembly (including the auxiliary piston 7 and the seals 8 and 9) participates in the power-assisting forward movement under the action of the hydraulic pressure, directly pressing the auxiliary power-assisting main piston assembly (including the main piston 3 and the seal) to push the output piston 14 to overcome the resistance of the second return spring 15 to close the idle stroke XK and start to build pressure, and output hydraulic pressure to the rear brake chamber QQ brake. At the same time, when the high hydraulic pressure enters the input auxiliary boosting chamber channel B7, the input rod 2 is subjected to the backward hydraulic feedback force fb to resist the input force F, limiting the opening of the auxiliary high-pressure valve port F5. When the driver stabilizes the brake pedal and no longer applies force, the primary piston 3 assists the forward movement relative to the input rod 2 to close the auxiliary high-pressure valve port F5, and the input force F is in a balanced state with the backward hydraulic feedback force fb and the resistance force f of the first return spring 10.

[0068] Compared with the normal good state, the braking process is equivalent to a slightly longer stroke of the power assist, there is no hydraulic output from the front brake chamber QQ, and the output from the rear brake chamber RR is the same as the normal output, which is similar to the failure of a single chamber of a traditional brake master cylinder.

[0069] (III) When the auxiliary booster chamber BB or auxiliary energy storage pipeline fails

[0070] When the driver steps on the brake pedal, as in the normal working process described above, only the main energy storage pipeline participates in the boosting work. When the maximum boosting output pressure of the main energy storage pipeline is exceeded, the input rod 2 moves forward under the action of the pedal force F, first closing the auxiliary pressure relief valve port F6, and then opening the auxiliary high-pressure valve port F5. The high hydraulic pressure is released to the auxiliary boosting chamber BB and then leaks away, or there is no accumulator hydraulic pressure release, and the boosting auxiliary piston assembly (including the auxiliary piston 7 and seals 8, 9) does not move; the input rod 2 continues to move forward, pressing the feedback piston 12 to push the main piston 3 and the output piston 14 to further build pressure, which is equivalent to the input force F directly participating in the pressure building, similar to a single accumulator hydraulic booster. Compared with the normal good state, there is one less boost, and the maximum boost inflection point is relatively lower.

[0071] 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 brake backup function, characterized in that: include: A master cylinder housing, the front end of which is closed, and the rear end of which is provided with an opening connected to the inner cavity thereof, wherein the master cylinder housing is provided with a rear high-pressure hydraulic output channel, a normal-pressure channel C0, a normal-pressure channel C1, a front high-pressure hydraulic output channel, a main high-pressure hydraulic input channel, and a secondary high-pressure hydraulic input channel connected to the inner cavity from front to back in sequence; A brake piston assembly, wherein the brake piston assembly is slidably disposed at the front portion of the inner cavity of the master cylinder housing, and is precisely matched with the master cylinder housing to form a rear brake cavity, wherein the rear brake cavity is communicated with the rear high hydraulic pressure output channel; A booster piston assembly, the booster piston assembly is slidably arranged at the rear part of the inner cavity of the master cylinder housing, and comprises a main piston, a sub-piston and an input rod slidably arranged in the main piston, the front end of the main piston abuts against the brake piston, the sub-piston is slidably sleeved on the rear part of the main piston, and the rear end of the input rod extends out from the inside of the master cylinder housing, the main piston and the input rod are precisely matched to form a main sliding valve sealing mechanism and a sub-sliding valve sealing mechanism, the main piston, the sub-piston and the master cylinder housing are respectively surrounded by a main booster chamber and a sub-boosting chamber at the front and rear of the sub-piston, the main piston and the input rod are surrounded by a sub-feedback chamber, the sub-feedback chamber is communicated with the sub-boosting chamber, one side of the main sliding valve sealing mechanism is communicated with the main booster chamber, and the other side is communicated with the main high hydraulic pressure input channel, one side of the sub-sliding valve sealing mechanism is communicated with the sub-boosting chamber, and the other side is communicated with the sub-high hydraulic pressure input channel; The master piston and the master cylinder housing are surrounded to form a front brake chamber, the front brake chamber is communicated with the main boost chamber, and the front brake chamber is communicated with the front high hydraulic pressure output channel; A feedback piston is slidably disposed at the front of the main piston, the main piston and the feedback piston are surrounded by a main feedback chamber, the main feedback chamber is communicated with the main boosting chamber, and a first return spring is disposed between the feedback piston and the input rod; A high-pressure accumulator booster assembly includes a main energy storage pipeline and an auxiliary energy storage pipeline that are independent of each other, and the main energy storage pipeline and the auxiliary energy storage pipeline are respectively connected to a main high-pressure input channel and an auxiliary high-pressure input channel; The fluid storage tank assembly includes three chambers and connection ports, which are respectively connected to the high hydraulic accumulator booster assembly, the booster piston assembly and the brake piston assembly; The input rod is provided with a brake fluid return channel communicating with the normal pressure channel C1; The operating stroke of the main sliding valve sealing mechanism is smaller than the operating stroke of the auxiliary sliding valve sealing mechanism; Seals are respectively provided at the connection between the rear periphery of the main piston and the opening of the main cylinder housing, at the front and rear connection between the middle part and the secondary piston, at the connection between the front end and the main cylinder housing, and at the front and rear sides of the main high hydraulic input channel. Seals are respectively provided at the periphery of the secondary piston and the front and rear sides of the secondary high hydraulic input channel. Seals are provided at the connection between the inner cavity wall of the main piston and the rear end of the input rod, and at the connection between the feedback piston and the front and rear sides of the main feedback cavity.

2. The hydraulic booster assembly device with brake backup function according to claim 1, characterized in that: The main sliding valve sealing mechanism includes a main pressure relief valve port, a main high-pressure valve port and a main normally closed valve port. An annular groove is provided on the input rod between the main high-pressure valve port and the main normally closed valve port as a main high-pressure channel. The auxiliary sliding valve sealing mechanism includes an auxiliary pressure relief valve port, an auxiliary high-pressure valve port and an auxiliary normally closed valve port. The input rod is provided with an axial shallow groove behind the auxiliary high-pressure valve port as a auxiliary high-pressure channel. The action strokes of the main pressure relief valve port and the auxiliary pressure relief valve port are respectively smaller than the action strokes of the main high-pressure valve port and the auxiliary high-pressure valve port.

3. The hydraulic booster assembly device with brake backup function according to claim 1, characterized in that: The outer circles of the main piston and the auxiliary piston have two diameter sections, and the rear end diameter is larger than the front end diameter. The hydraulic force difference of the high hydraulic pressure can realize the backward hydraulic return force, so that the main piston and the auxiliary piston can quickly return to the initial position when the brake is released.

4. The hydraulic booster assembly device with brake backup function according to claim 1, characterized in that: The brake piston assembly includes an output piston and a second return spring for helping the brake piston to retreat when the brake is released. One end of the output piston abuts against the main piston, and the other end abuts against the front end of the master cylinder housing through the second return spring. The second return spring is arranged in the rear brake chamber.

5. The hydraulic booster assembly device with brake backup function as claimed in claim 4, characterized in that: Seals are provided at the connection points between the outer periphery of the output piston and the inner wall of the master cylinder housing at the front and rear sides of the normal pressure channel C0.

6. The hydraulic booster assembly device with brake backup function as claimed in claim 1, characterized in that: The main energy storage pipeline and the auxiliary energy storage pipeline share a set of hydraulic control components, or are each equipped with a separate set of hydraulic control components.

7. The hydraulic booster assembly device with brake backup function as claimed in claim 6, characterized in that: The hydraulic control component includes a motor, a hydraulic pump and a controller respectively connected to the motor, and also includes a main hydraulic sensor and a secondary hydraulic sensor respectively connected to the main energy storage pipeline and the secondary energy storage pipeline. The main energy storage pipeline is respectively connected to the main accumulator A, the main hydraulic sensor and the hydraulic pump, the secondary energy storage pipeline is respectively connected to the secondary accumulator B, the secondary hydraulic sensor and the hydraulic pump, and the controller is respectively connected to the motor, the main hydraulic sensor and the secondary hydraulic sensor.

8. The hydraulic booster assembly device with brake backup function as claimed in claim 1, characterized in that: The end of the input rod is connected with a U-shaped fork head for connecting with a brake pedal.

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