Piston assembly and brake device with same

Abstract

The utility model provides a piston assembly and a brake device with the piston assembly, and belongs to the technical field of brake systems. The problem that an existing brake is low in safety during emergency braking is solved. The piston assembly comprises a barrel-shaped first piston, a second piston is arranged in the first piston in a sliding mode, sealing is formed between the outer side of the second piston and the inner wall of the first piston, a through hole is formed in the closed end of the first piston in a penetrating mode, and a valve element and a reset spring are arranged on the side, facing the through hole, of the second piston. The reset spring is arranged between the valve element and the second piston, the valve element can shield the through hole under the elastic force effect of the reset spring, a buffer spring is arranged on the other side of the second piston, and the second piston can be close to the through hole under the elastic force effect of the buffer spring. The piston assembly has the advantage of being high in safety.

Description

TECHNICAL FIELD

[0001] The utility model belongs to brake system technical field relates to a piston assembly and have the brake device of this piston assembly. BACKGROUND

[0002] Motorcycles, tricycles, four-wheelers are currently used more on the market in addition to the vehicle, it also has the brake system containing brake pad and other structures.

[0003] For example, people designed a hydraulic disc brake, and applied for Chinese patent, its application number is: 201320375308.5;Its publication number is: CN203439214U;The hydraulic disc brake includes installation support, installs on the brake caliper, installs on the brake caliper brake pad, installs on the brake caliper drive piston, and the drive piston is connected with the dynamic brake pad, brake pad and dynamic brake pad between them are provided with the shoe spring that two are opened. The hydraulic disc brake when using, input brake fluid into the brake caliper, utilize the hydraulic pressure of brake fluid to promote the drive piston to move, and then drive the dynamic brake pad to brake disc and abut to realize the braking.

[0004] However, the hydraulic disc brake when emergency braking, because the instantaneous oil pressure of brake fluid input into the brake caliper is larger, will be through the drive piston and press the dynamic brake pad on the brake disc, cause the wheel to lock, there is wheel spin, lose the steering and other safety hazards. UTILITY MODEL CONTENTS

[0005] The utility model discloses a kind of piston assembly and have the brake device of this piston assembly, solve the problem of low safety of existing brake when emergency braking.

[0006] The utility model discloses a kind of piston assembly and have the brake device of this piston assembly, solve the problem of low safety of existing brake when emergency braking.

[0007] Piston assembly, including the piston one of barrel shape, characterized in that, the piston two is slidably arranged in the piston one, and the outer side of the piston two and the inner wall of the piston one form a seal, the closed end of the piston one is provided with a through hole, the one side of the piston two towards through hole is provided with valve core and return spring, the return spring is arranged between the valve core and the piston two, and the valve core can block the above-mentioned through hole under the elastic force of return spring, the other side of the piston two is provided with buffer spring, and the piston two can be close to the above-mentioned through hole under the elastic force of buffer spring.

[0008] The piston assembly is also installed in the existing brake caliper for use, the outer side of the piston one and the inner wall of the brake caliper form a seal, the closed end of the piston one is towards the oil inlet of brake caliper, and the open end of the piston one is connected with the dynamic brake pad.

[0009] In the slow braking, the oil inlet of the brake caliper, the oil pressure acts on the piston one, because the oil pressure is low, the valve core keeps the state of shielding the through hole under the action of the elastic force of the reset spring, the through hole is not opened, the whole piston assembly moves under the action of the oil pressure, pushes the dynamic brake pad to abut against the brake disc, realizes the braking, the braking process is same as the prior art.

[0010] In the emergency braking, the oil pressure in the brake caliper rises rapidly, acts on the closed end of the piston one, at the same time, the oil pressure pushes open the valve core, so that the through hole is opened, the brake fluid enters the piston one through the through hole and acts on the piston two, so that the piston two compresses the buffer spring and moves, at this time, the oil pressure in the brake caliper decreases due to the brake fluid entering the piston one, that is, the oil pressure acting on the piston one and the dynamic brake pad decreases. After the brake fluid pushes open the valve core and enters the piston one, the pressure difference on both sides of the valve core decreases, and the valve core will shield the through hole again under the action of the elastic force of the reset spring. Then, the valve core is pushed open again by the oil pressure in the brake caliper, and so on, so that the pressure acting directly on the piston one and the dynamic brake pad in the brake caliper fluctuates continuously, which cuts the state of strong braking into a state similar to multiple point braking, avoiding the situation that the wheels are locked and the wheels are fishtailed, losing steering and other situations, and improving the safety.

[0011] In the above-mentioned piston assembly, a recess is formed on the side of the piston two facing the through hole, one end of the reset spring abuts against the valve core, and the other end extends into the recess and abuts against the bottom of the recess. The reset spring is limited by the recess, avoiding the offset of the reset spring and the valve core, and ensuring the effectiveness of the sealing of the through hole.

[0012] In the above-mentioned piston assembly, a ring-shaped clamping groove is formed in the inner wall of the open end of the piston one, a ring-shaped clamping ring is arranged in the clamping groove, a ring-shaped gasket is arranged on the side of the clamping ring facing the piston two, and one end of the buffer spring abuts against the piston two and the other end abuts against the gasket. The buffer spring is limited and supported by the clamping ring and the gasket, and the installation is more convenient.

[0013] In the above-mentioned piston assembly, the other side of the piston two is recessed to form a notch, and one end of the buffer spring abuts against the bottom of the notch. The notch accommodates part of the buffer spring, so that the structure is more compact.

[0014] In the above-mentioned piston assembly, the valve core is spherical. The spherical valve core is more conducive to the sealing of the through hole.

[0015] As another case, in the above-mentioned piston assembly, the piston assembly further comprises a cylindrical shell, the valve core and the reset spring are arranged in the shell, and the side of the valve core facing the through hole partially extends out of the shell. The valve core and the reset spring are installed in one shell to form an integral component, which is convenient to install.

[0016] In the piston assembly described above, the piston has an annular protrusion on the side facing the through hole, and the valve core is disposed within the protrusion. The protrusion forms a cavity within it, which can be filled with brake fluid when the valve core is pushed open.

[0017] A braking device includes a caliper body with an oil inlet and a movable brake pad, characterized in that the braking device further includes the aforementioned piston assembly, which is slidably disposed within the caliper body and forms a seal between the outer side of the piston assembly and the inner wall of the caliper body, and the movable brake pad is connected to the piston assembly.

[0018] Compared with existing technologies, this piston assembly and the braking device having the piston assembly, by setting a valve core, a return spring, a second piston and a buffer spring in the first piston, disperses the oil pressure in the caliper body into a pulse-like intermittent braking method during emergency braking, which can effectively prevent wheel lock-up and cause wheel fishtailing, loss of steering and other situations, thus improving safety. Attached Figure Description

[0019] Figure 1 This is a cross-sectional structural schematic diagram of the first embodiment of the piston assembly.

[0020] Figure 2 This is a cross-sectional structural schematic diagram of Embodiment 1 of the braking device.

[0021] In the diagram, 1. Piston 1; 1a. Through hole; 1b. Slot; 2. Piston 2; 2a. Concave hole; 2b. Notch; 3. Valve core; 4. Return spring; 5. Buffer spring; 6. Snap ring; 7. Washer; 8. Clamp body; 8a. Oil inlet; 9. Moving brake pad; 10. Brake disc. Detailed Implementation

[0022] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments. Example 1

[0023] like Figure 2 As shown, the braking device includes a caliper body 8, a moving brake pad 9, and a brake disc. The caliper body 8 has a recessed cavity on the side facing the brake disc. An oil inlet 8a is provided through the bottom of the cavity. A piston assembly is slidably disposed in the cavity. An annular sealing ring is fixed on the side wall of the cavity. The inner side of the sealing ring abuts against the outer side of the piston assembly to form a seal. One end of the piston assembly extending out of the cavity opening is connected to the moving brake pad 9.

[0024] like Figure 1As shown, the piston assembly comprises a barrel-shaped piston one 1, the closed end of the piston one 1 is towards the oil inlet 8a, and the open end is connected with the movable brake pad 9. A piston two 2 is slidably arranged in the piston one 1, and an annular sealing ring is fixed to the outer side of the piston two 2 to form a seal with the inner wall of the piston one 1. A through hole 1a is formed through the closed end of the piston one 1, a valve core 3 and a return spring 4 are arranged on the side of the piston two 2 towards the through hole 1a, the return spring 4 is arranged between the valve core 3 and the piston two 2, and the valve core 3 can block the through hole 1a under the elastic force of the return spring 4. A buffer spring 5 is arranged on the other side of the piston two 2, and the piston two 2 can move close to the through hole 1a under the elastic force of the buffer spring 5. Here, the through hole 1a is a circular hole with a diameter of 0.5mm-3.0mm, preferably 2.5mm.

[0025] In this embodiment, the side of the piston two 2 towards the through hole 1a has a convex part in the shape of a circular ring; the valve core 3 is in the shape of a ball, that is, a steel ball is selected as the valve core 3; a recess hole 2a is formed in the side of the piston two 2 towards the through hole 1a, and the recess hole 2a is formed at the center of the convex part; one end of the return spring 4 abuts against the valve core 3, and the other end of the return spring 4 extends into the recess hole 2a and abuts against the bottom of the recess hole 2a; the inner wall of the open end of the piston one 1 has an annular flared groove, the bottom of the flared groove is provided with an annular clamping groove 1b, an annular clamping ring 6 is arranged in the clamping groove 1b, the inner side of the clamping ring 6 extends out of the clamping groove 1b, the side of the clamping ring 6 towards the piston two 2 is provided with a circular ring-shaped rubber gasket 7, the other side of the piston two 2 is recessed to form a recess 2b, one end of the buffer spring 5 abuts against the bottom of the recess 2b, and the other end of the buffer spring 5 tightly presses the gasket 7 against the clamping ring 6; here, the buffer spring 5 is a spiral compression spring with a rectangular cross section.

[0026] When the brake device is slowly braking, the oil inlet 8a of the caliper body 8 is filled with oil, and the oil pressure acts on the piston one 1. Because the oil pressure changes little, the valve core 3 remains in the state of blocking the through hole 1a under the elastic force of the return spring 4, the through hole 1a is not opened, and the entire piston assembly moves under the action of the oil pressure, pushes the movable brake pad 9 to abut against the brake disc, and realizes braking. The braking process is the same as the existing technology.

[0027] When emergency braking, the oil pressure in the caliper body 8 rapidly rises, acts on the closed end of the piston one 1, and at the same time, the oil pressure pushes open the valve core 3, so that the through hole 1a is opened, the brake fluid enters the piston one 1 through the through hole 1a and acts on the piston two 2, so that the piston two 2 compresses the buffer spring 5 and moves. At this time, the oil pressure in the caliper body 8 decreases because the brake fluid enters the piston one 1, that is, the oil pressure acting on the piston one 1 and the movable brake pad 9 decreases.

[0028] After the brake fluid pushes the valve core 3 into the piston 1, the pressure difference on both sides of the valve core 3 is reduced, and the valve core 3 will be re-blocked under the elastic force of the reset spring 4. Then, the valve core 3 is re-opened by the oil pressure in the caliper body 8, and so on, so that the pressure directly acting on the piston 1 and the brake pad 9 in the caliper body 8 is constantly fluctuated, which cuts the strong braking state into a multiple-point braking state, avoids the wheel from being locked to cause the wheel to spin, lose steering, and improves the safety.

[0029] In the brake device, the elastic force of the reset spring 4 is small in actual design, so that not only the quick response in emergency braking can be achieved, but also the valve core 3 can be prevented from completely blocking the through hole 1a under the elastic force of the reset spring 4, that is, the cooperation of the valve core 3 and the reset spring 4 mainly plays a damping role. Then, after the emergency braking is over, the brake fluid in the piston 1 is discharged into the recess cavity of the caliper body 8 under the vibration of the vehicle body and the weight of the valve core 3, so as to realize pressure balance. Embodiment Two

[0030] The technical scheme of the embodiment is substantially the same as that of Embodiment One, and the difference lies in that the piston assembly further comprises a cylindrical shell, the valve core 3 and the reset spring 4 are arranged in the shell, and the side of the valve core 3 facing the through hole 1a partially extends out of one end of the shell, and the other end of the shell is connected with an end cover. In this way, the spherical valve core 3 and the reset spring 4 are installed in a shell to form an integrated component, which is convenient for installation. Embodiment Three

[0031] The technical scheme of the embodiment is substantially the same as that of Embodiment One, and the difference lies in that the piston 1 is not provided with the valve core 3 and the reset spring 4. The scheme without the valve core 3 and the reset spring 4 can also rely on the piston 2 to achieve the effect of relieving the wheel from being locked in emergency braking.

[0032] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art to which the present application belongs can make various modifications or supplements to the described specific embodiments or adopt similar ways to replace them, without deviating from the spirit of the present application or exceeding the scope defined by the appended claims.

Claims

1. A piston assembly comprising a barrel-shaped piston one (1), characterized in that, The piston one (1) is internally slidably provided with a piston two (2), and a seal is formed between the outer side of the piston two (2) and the inner wall of the piston one (1), a through hole (1a) is formed through the closed end of the piston one (1), a valve core (3) and a reset spring (4) are arranged on the side of the piston two (2) facing the through hole (1a), the reset spring (4) is arranged between the valve core (3) and the piston two (2), and the valve core (3) can block the through hole (1a) under the elastic force of the reset spring (4), a buffer spring (5) is arranged on the other side of the piston two (2), and the piston two (2) can be close to the through hole (1a) under the elastic force of the buffer spring (5).

2. The piston assembly of claim 1, wherein, The piston two (2) is provided with a recess hole (2a) on the side facing the through hole (1a), one end of the reset spring (4) abuts against the valve core (3), and the other end extends into the recess hole (2a) and abuts against the bottom of the recess hole (2a).

3. The piston assembly of claim 1 or 2, wherein, The open end of the piston one (1) is internally provided with an annular clamping groove (1b), an annular clamping ring (6) is arranged in the clamping groove (1b), the annular clamping ring (6) is provided with an annular gasket (7) on the side facing the piston two (2), one end of the buffer spring (5) abuts against the piston two (2), and the other end abuts against the gasket (7).

4. The piston assembly of claim 3, wherein, The other side of the piston two (2) is recessed to form a recess (2b), and one end of the buffer spring (5) abuts against the bottom of the recess (2b).

5. The piston assembly of claim 1 or 2, wherein, The valve core (3) is spherical.

6. The piston assembly of claim 5, wherein, The piston assembly further comprises a cylindrical shell, the valve core (3) and the reset spring (4) are arranged in the shell, and the side of the valve core (3) facing the through hole (1a) partially extends out of the shell.

7. The piston assembly of claim 1 or 2, wherein, The side of the piston two (2) facing the through hole (1a) has a protruding annular protrusion, and the valve core (3) is arranged in the protrusion.

8. A brake device comprising a caliper body (8) having an oil inlet (8a) and a movable brake pad (9), characterized in that, The brake device further comprises the piston assembly according to any one of claims 1-7, the piston assembly is slidably arranged in the caliper body (8), and a seal is formed between the outer side of the piston assembly and the inner wall of the caliper body (8), and the movable brake pad (9) is connected with the piston assembly.

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