Three-chamber booster structure for vehicle electronic hydraulic brake system

Abstract

The present invention discloses a three-chamber booster structure for a vehicle electronic hydraulic brake system. It includes a hydraulic cylinder and a first piston and a second piston located in the hydraulic cylinder; a cylinder hole is provided in the hydraulic cylinder, a connecting flange is installed at the outer end of the cylinder hole, an inner cavity is provided in the connecting flange, and the inner cavity of the connecting flange is coaxially connected with the cylinder hole of the hydraulic cylinder; the second piston and the first piston are sequentially installed in the cylinder hole from the inside to the outside, and the cylinder hole between the first piston and the second piston forms a first cavity; the cylinder hole between the second piston and the inner bottom surface of the cylinder hole forms a second cavity; a part of the outer end of the first piston extends into the inner cavity of the connecting flange, and the inner cavity of the connecting flange between the outer end of the first piston and the hydraulic cylinder forms a third cavity; the first cavity, the second cavity, and the third cavity are connected. The present invention can meet the role of supplementing the initial fluid volume in brakes with excessively high fluid volume required by some brake systems, and can be more widely applied to brake systems under the role of increasing the maximum brake pressure.

Description

Technical Field

[0001] The invention relates to a vehicle brake boosting structure, in particular to a structure with three boosting chambers for electronic hydraulic braking. Background Art

[0002] Most of the electronic hydraulic brake systems currently used in the market have a two-boost chamber structure, and some of them have problems such as untimely or insufficient fluid replenishment. When the electronic system fails, it is impossible to provide sufficient brake fluid in time. Summary of the invention

[0003] In order to solve the problems existing in the background technology, the present invention provides a three-chamber pressurizing structure for a vehicle electronic hydraulic brake system.

[0004] The technical solution adopted by the present invention is:

[0005] The present invention comprises a hydraulic cylinder and a first piston and a second piston located in the hydraulic cylinder; a cylinder hole is provided in the hydraulic cylinder, a connecting flange is installed at the outer end of the cylinder hole, an inner cavity is provided in the connecting flange, and the inner cavity of the connecting flange is coaxially connected with the cylinder hole of the hydraulic cylinder; the second piston and the first piston are sequentially installed in the cylinder hole from the inside to the outside, and the cylinder hole between the first piston and the second piston forms a first cavity; the cylinder hole between the second piston and the inner bottom surface of the cylinder hole forms a second cavity; a part of the outer end of the first piston extends into the inner cavity of the connecting flange, and the inner cavity of the connecting flange between the outer end of the first piston and the hydraulic cylinder forms a third cavity; the first cavity, the second cavity, and the third cavity are connected.

[0006] The second piston and the inner bottom surface of the cylinder hole of the hydraulic cylinder are connected via a second piston spring assembly, and the second piston and the first piston are connected via a first piston spring.

[0007] The second piston and the bore wall of the hydraulic cylinder are sealed and connected via the second piston auxiliary leather cup and the second piston main leather cup.

[0008] The inner end of the first piston and the cylinder hole of the hydraulic cylinder are sealed and connected via the first piston auxiliary leather cup and the first piston main leather cup.

[0009] The outer end of the first piston and the cylinder hole of the hydraulic cylinder are sealed and connected via a wheel cylinder cup.

[0010] An oil pot is installed outside the hydraulic cylinder, and the oil pot is communicated with the first cavity, the second cavity and the third cavity through a pipeline opened inside the hydraulic cylinder.

[0011] The outer end of the first piston is connected to a push rod, the push rod is further connected to a push rod fork, and the push rod fork is connected to a vehicle pedal.

[0012] A flange oil pipeline is provided inside the connecting flange, so that the third cavity is connected to the pipeline inside the hydraulic cylinder through the flange oil pipeline, and then connected to the oil pot.

[0013] The invention applies force to the push rod and transmits it to the first piston and the second piston, so that the volume of the three boosting chambers is reduced and the brake fluid is transferred through the oil circuit. When the push rod retreats, the volume of the three boosting chambers is increased and the brake fluid returns to the boosting chambers.

[0014] The beneficial effects of the present invention are:

[0015] The present invention is a three-chamber pressurizing structure capable of satisfying the above functions. During normal braking, the brake fluid in the third chamber can be compensated to the first chamber and the second chamber, and more brake fluid can also be provided when the electronic system fails.

[0016] The present invention can satisfy the function of supplementing the initial fluid volume in brakes where some brake systems require excessively high fluid volume, and can be more widely applicable to brake systems by increasing the maximum brake pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Assembly view of the relevant components of an electronic brake system with three boost chambers.

[0018] Figure 2 This is the oil circuit view of the three-chamber supercharging structure.

[0019] In the figure: 1, connecting flange, 2, hydraulic cylinder, 3, second piston spring assembly, 4, second piston, 41, second piston secondary leather cup, 42, second piston main leather cup, 5, first piston spring, 6, first piston, 61, wheel cylinder leather cup, 62, first piston secondary leather cup, 63, first piston main leather cup, 7, push rod return spring, 8, fixing pin, 9, push rod, 10, push rod fork, 11, oil pot. DETAILED DESCRIPTION

[0020] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] like Figure 1 and Figure 2As shown, the structure includes a hydraulic cylinder 2 and a first piston 6 and a second piston 4 located in the hydraulic cylinder 2; a cylinder hole is opened in the hydraulic cylinder 2, a connecting flange 1 is installed at the outer end of the cylinder hole, the connecting flange 1 is fixed to the hydraulic cylinder 2, an inner cavity is opened in the connecting flange 1, and the inner cavity of the connecting flange 1 is coaxially connected with the cylinder hole of the hydraulic cylinder 2; the second piston 4 and the first piston 6 are sequentially installed in the cylinder hole from the inside to the outside, and the cylinder hole between the first piston 6 and the second piston 4 forms a first cavity; the second piston 4 is located near the bottom of the cylinder hole, and the cylinder hole between the second piston 4 and the inner bottom surface of the cylinder hole forms a second cavity; a part of the outer end of the first piston 6 extends into the inner cavity of the connecting flange 1, and the inner cavity of the connecting flange 1 between the outer end of the first piston 6 and the hydraulic cylinder 2 forms a third cavity; the first cavity, the second cavity, and the third cavity are connected, and all serve as three booster cavities.

[0022] The third chamber is actually an annular chamber formed between the outside of the first piston 6 and the inner chamber of the connecting flange 1 .

[0023] The present invention forms a three-chamber pressurization structure by adding a third chamber, which can quickly replenish oil for the original two chambers and improve the braking response speed.

[0024] The second piston 4 and the inner bottom surface of the cylinder hole of the hydraulic cylinder 2 are connected via the second piston spring assembly 3. The second piston spring assembly 3 is stored in the second chamber, which can enable the second piston 4 to return to its original position after moving.

[0025] The second piston 4 and the first piston 6 are connected via a first piston spring 5. The first piston spring 5 is provided between the first chamber and the second chamber, and can make the first piston 6 return to its original position after moving.

[0026] The second piston 4 and the cylinder hole wall of the hydraulic cylinder 2 are sealed and connected by the second piston auxiliary leather cup 41 and the second piston main leather cup 42. Specifically, two annular grooves are provided on the cylinder hole wall of the hydraulic cylinder 2 at the middle of the second piston 4, and the second piston auxiliary leather cup 41 and the second piston main leather cup 42 are respectively installed in the two annular grooves, and the outer peripheral surface of the second piston 4 and the cylinder hole wall of the hydraulic cylinder 2 are sealed and connected by the second piston auxiliary leather cup 41 and the second piston main leather cup 42.

[0027] The inner end of the first piston 6 and the cylinder hole of the hydraulic cylinder 2 are sealed and connected by the first piston auxiliary leather cup 62 and the first piston main leather cup 63. Specifically, two annular grooves are provided on the wall of the cylinder hole of the hydraulic cylinder 2 at the inner end of the first piston 6, and the first piston auxiliary leather cup 62 and the first piston main leather cup 63 are respectively installed in the two annular grooves, and the outer peripheral surface of the inner end of the first piston 6 and the wall surface of the cylinder hole of the hydraulic cylinder 2 are sealed and connected by the first piston auxiliary leather cup 62 and the first piston main leather cup 63.

[0028] The outer end of the first piston 6 and the cylinder hole of the hydraulic cylinder 2 are sealed and connected via the wheel cylinder leather cup 61. Specifically, an annular groove is provided on the wall of the cylinder hole of the hydraulic cylinder 2 at the outer end of the first piston 6, and the wheel cylinder leather cup 61 is respectively installed in the annular groove, and the outer peripheral surface of the outer end of the first piston 6 and the wall of the cylinder hole of the hydraulic cylinder 2 are sealed and connected via the wheel cylinder leather cup 61.

[0029] An oil pot 11 is installed outside the hydraulic cylinder 2 , and the oil pot 11 is connected to the first cavity, the second cavity, and the third cavity through a pipeline opened inside the hydraulic cylinder 2 .

[0030] The outer end of the first piston 6 is connected to a push rod 9, the push rod 9 is further connected to a push rod fork 10, and the push rod fork 10 is connected to a vehicle pedal.

[0031] The first piston 6 is connected to the push rod 9 via a fixing pin 8:

[0032] The fixing pin 8 is in the shape of a straw hat, and the brim of the straw hat-shaped fixing pin 8 is connected to the connecting flange 1 through the push rod return spring 7. The push rod return spring 7 is sleeved outside the fixing pin 8 and the connecting flange 1. The straw hat-shaped end of the fixing pin 8 extends into the connecting flange 1 and is connected to the first piston 6. A ball socket is arranged in the straw hat shape of the fixing pin 8, and the end of the push rod 9 is spherical. The end of the push rod 9 is embedded in the ball socket of the fixing pin 8. After installation and connection, the push rod 9 can swing freely in the ball socket of the fixing pin 8 while ensuring that it does not fall off, and at the same time does not affect the push rod return spring 7.

[0033] In this way, the push rod 9 is connected to the fixing pin 8, and the fixing pin 8 is connected to the first piston 6, forming a power transmission mechanism.

[0034] The flange oil pipeline is opened inside the connecting flange 1, so that the third cavity is connected to the pipeline inside the hydraulic cylinder 2 through the flange oil pipeline, and then connected to the oil pot 11. There is a pipeline inside the hydraulic cylinder 2, which can connect the third cavity with the first cavity, the second cavity, and the oil pot 11.

[0035] The connecting flange 1 has a sealing surface and a sealing structure, and forms a closed third chamber with the hydraulic cylinder 2 and the first piston 6 .

[0036] The first piston 6 has a sealing structure, which can be sealed with the inner diameter of the connecting flange 1 and can move axially inside the connecting flange 1 .

[0037] like Figure 2 As shown, the push rod 9 is pushed, and the push rod 9 directly or indirectly transmits force to the first piston 6 and the second piston 4, so that the first piston 6 and the second piston 4 move forward, resulting in a reduction in the volume of the first chamber, the second chamber, and the third chamber.

[0038] When the pedal is depressed and the push rod 9 is pushed forward, the first piston 6 moves toward the bottom of the cylinder hole of the hydraulic cylinder 2, driving the volume of the third chamber to decrease, and the volumes of the first and second chambers to decrease as well, but the magnitude of the decrease in the volume of the third chamber is greater than the sum of the magnitudes of the decreases in the volumes of the first and second chambers (for example, the stroke of the third chamber is 40 mm, the stroke of the first chamber is 20.3 mm, and the stroke of the second chamber is 16.4 mm; assuming that the third chamber advances 10 mm, the springs of the first and second chambers will be compressed, and will advance different strokes according to the change in the spring force, and the strokes of the first and second chambers will change. The volume reduction of the third chamber is greater than the sum of the volume reductions of the first and second chambers. The volume of the third chamber produced by the 10mm stroke will enter the first and second chambers. The brake fluid in the third chamber will flow into the first and second chambers along the pipeline, providing more brake fluid for the first and second chambers, which can reduce the idle stroke during braking, quickly replenish the first and second chambers, and improve the braking response speed.

[0039] When the push rod 9 returns to its original position after the pedal is released, the first piston 6 moves away from the bottom of the cylinder hole of the hydraulic cylinder 2, driving the volume of the third chamber to increase, and the brake fluid in the oil pot 11 enters the third chamber, so that the third chamber is refilled with brake fluid and waits for the next braking.

Claims

1. A three-chamber pressurizing structure for a vehicle electronic hydraulic brake system, characterized in that: The invention comprises a hydraulic cylinder (2) and a first piston (6) and a second piston (4) located in the hydraulic cylinder (2); a cylinder hole is provided in the hydraulic cylinder (2), a connecting flange (1) is installed at the outer end of the cylinder hole, an inner cavity is provided in the connecting flange (1), and the inner cavity of the connecting flange (1) is coaxially connected to the cylinder hole of the hydraulic cylinder (2); A second piston (4) and a first piston (6) are arranged in sequence in the cylinder hole from the inside to the outside; a first cavity is formed in the cylinder hole between the first piston (6) and the second piston (4); a second cavity is formed between the second piston (4) and the inner bottom surface of the cylinder hole; a portion of the outer end of the first piston (6) extends into the inner cavity of the connecting flange (1); a third cavity is formed in the inner cavity of the connecting flange (1) between the outer end of the first piston (6) and the hydraulic cylinder (2); the first cavity, the second cavity and the third cavity are connected; An oil pot (11) is installed outside the hydraulic cylinder (2), and the oil pot (11) is connected to the first cavity, the second cavity, and the third cavity through a pipeline opened inside the hydraulic cylinder (2); When the push rod (9) is pushed forward after the pedal is depressed, the first piston (6) moves in a direction away from the push rod (9), driving the volume of the third chamber to decrease, and the volumes of the first chamber and the second chamber to decrease as well. The magnitude of the volume reduction of the third chamber is greater than the sum of the magnitudes of the volume reductions of the first chamber and the second chamber. The brake fluid in the third chamber flows along the pipeline into the first chamber and the second chamber, providing more brake fluid for the first chamber and the second chamber, reducing the idle stroke during braking, and quickly replenishing the first chamber and the second chamber. The second piston (4) and the inner bottom surface of the cylinder hole of the hydraulic cylinder (2) are connected via a second piston spring assembly (3), and the second piston (4) and the first piston (6) are connected via a first piston spring (5); The connecting flange (1) has a flange oil pipeline inside, so that the third chamber is connected to the pipeline inside the hydraulic cylinder (2) through the flange oil pipeline, and then connected to the oil pot (11).

2. The three-chamber pressurizing structure for a vehicle electronic hydraulic brake system according to claim 1, characterized in that: The second piston (4) and the cylinder bore wall of the hydraulic cylinder (2) are sealed and connected via a second piston auxiliary leather cup (41) and a second piston main leather cup (42).

3. The three-chamber pressurizing structure for a vehicle electronic hydraulic brake system according to claim 1, characterized in that: The inner end of the first piston (6) and the cylinder hole of the hydraulic cylinder (2) are sealed and connected via a first piston auxiliary leather cup (62) and a first piston main leather cup (63).

4. The three-chamber pressurizing structure for a vehicle electronic hydraulic brake system according to claim 1, characterized in that: The outer end of the first piston (6) and the cylinder hole of the hydraulic cylinder (2) are sealed and connected via a wheel cylinder leather cup (61).

5. The three-chamber pressurizing structure for a vehicle electronic hydraulic brake system according to claim 1, characterized in that: The outer end of the first piston (6) is connected to a push rod (9), the push rod (9) is further connected to a push rod fork (10), and the push rod fork (10) is connected to a vehicle pedal.

Images