Brake master cylinder piston device

Abstract

The utility model discloses a brake master cylinder piston device which comprises a piston body, the two ends of the piston body are fixedly connected with end heads, the two end heads are both in a circular truncated cone shape, the outer side walls of the two end heads are both sleeved with first sealing sleeves, one side of each first sealing sleeve is symmetrically provided with two pushing blocks, and the four pushing blocks are all in an arc shape. The four push blocks are tightly attached to the outer sides of the two first sealing sleeves correspondingly. Four guide grooves are formed in the outer side walls of the two ends, guide rods matched with the guide grooves are fixedly connected to the two sides of the bottom ends of the four push blocks, and the bottom ends of the multiple guide rods are slidably connected with the inner sides of the multiple guide grooves correspondingly; the first sealing sleeve is pushed through the push block, the inner diameter and the outer diameter of the first sealing sleeve can be expanded, the outer wall of the first sealing sleeve is still tightly attached to the inner wall of a cylinder body, and therefore the sealing performance is guaranteed, the automobile braking effect is guaranteed, and safety is higher.

Description

Technical Field

[0001] The utility model relates to a brake master cylinder piston device, belonging to the technical field of brake master cylinder pistons. Background Art

[0002] The master cylinder is the core component of the automobile braking system. Its main function is to convert the mechanical energy generated by the driver stepping on the brake pedal into hydraulic energy, thereby driving the wheel brakes to slow down and stop the vehicle. When the driver steps on the brake pedal, the pedal pushes the master cylinder piston forward through the lever action; at this time, the brake fluid at the front end of the piston is compressed and generates pressure, while the brake fluid at the rear end of the piston enters the brake pipeline through the oil outlet and is transmitted to the wheel brake. In the wheel brake, the pressure of the brake fluid pushes the piston or friction plate to rub against the wheel, thereby generating a braking torque to slow down or stop the vehicle; when the driver releases the brake pedal, the return spring returns the master cylinder piston to the initial position, the pressure of the brake fluid is released, and the wheel brake is released from the braking state.

[0003] In order to ensure the sealing, sealing sleeves are usually provided at both ends of the piston in the brake master cylinder. When the piston moves in the master cylinder, the piston fits tightly against the inner wall of the cylinder to ensure the sealing. However, when the piston moves back and forth frequently for a long time, the outer side of the sealing sleeve frequently rubs against the inner wall of the cylinder, which will cause wear on the outer side of the sealing sleeve. When the wear is severe, it will affect the sealing effect. Utility Model Content

[0004] The purpose of the utility model is to provide a brake master cylinder piston device to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a brake master cylinder piston device, including a piston body, both ends of the piston body are fixedly connected with end heads, the two end heads are both set to a truncated cone shape, the outer side walls of the two end heads are sleeved with a first sealing sleeve, one side of the two first sealing sleeves are symmetrically provided with two push blocks, the four push blocks are all set to an arc shape, and the four push blocks are respectively tightly fitted with the outer sides of the two first sealing sleeves; four guide grooves are provided on the outer side walls of the two end heads, both sides of the bottom ends of the four push blocks are fixedly connected with guide rods adapted to the guide grooves, and the bottom ends of several guide rods are respectively slidably connected to the inner sides of several guide grooves; a fixed disk is provided on the side of the two end heads away from the piston body, a pushing mechanism is provided between the two fixed disks and the corresponding push blocks, and an elastic mechanism is provided between the two fixed disks and the corresponding end heads.

[0006] Preferably, the four pushing mechanisms each include a connecting rod, a first fixed block and a second fixed block, the first fixed block is fixedly connected to the center position of the pushing block, the second fixed block is fixedly connected to the outside of the fixed plate, the first fixed block and the second fixed block are connected by a connecting rod, and both ends of the connecting rod are rotatably connected to the first fixed block and the second fixed block respectively.

[0007] Preferably, the two elastic mechanisms each include a pin, a plurality of side blocks, a spring, a slot and a plurality of side grooves, the slot being opened on the outside of the end head, a pin matched with the slot being fixedly connected to the center position of one side of the fixed disk, one end of the pin being movably inserted in the slot, a spring being fixedly connected to the inner wall of the slot, the diameter of the spring being matched with the inner diameter of the slot, one end of the pin located in the slot being fixedly connected to the end of the spring, a plurality of side grooves being provided on the side wall of the slot, a plurality of side blocks matched with the side grooves being provided on the outer wall of the pin, and a plurality of the side blocks being slidably connected to a plurality of the side grooves respectively.

[0008] Preferably, a second sealing sleeve is fixedly connected to one side of the two end heads close to the piston body, and the two second sealing sleeves are sleeved on the periphery of the piston body.

[0009] Preferably, two positioning grooves are provided on one side of the two end heads close to the fixed disk, the four positioning grooves are respectively located on both sides of the two slots, two positioning plates matching the positioning grooves are fixedly connected to one side of the two fixed disks, the four positioning plates are respectively located on both sides of the two plug posts, the four positioning plates and the four positioning grooves are all arranged in an arc shape, and the four positioning plates are respectively movably inserted in the four positioning grooves.

[0010] Compared with the prior art, the beneficial effect of the utility model is that the inner diameter and outer diameter of the first sealing sleeve will be expanded by pushing the first sealing sleeve through the push block, so that the outer wall of the first sealing sleeve is still tightly fitted with the inner wall of the cylinder body, thereby ensuring the sealing, and then ensuring the braking effect of the car, which is safer. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the utility model;

[0012] Figure 2 This is a schematic diagram of the outer structure of the end of the utility model;

[0013] Figure 3 It is a schematic diagram of the connection structure of two push blocks and a fixed plate of the utility model;

[0014] Figure 4 It is a schematic diagram of the elastic mechanism structure of the utility model.

[0015] In the figure: 1. piston body; 2. end; 3. second sealing sleeve; 4. first sealing sleeve; 5. fixed plate; 6. pushing mechanism; 61. connecting rod; 62. first fixed block; 63. second fixed block; 7. elastic mechanism; 71. plug column; 72. side block; 73. spring; 74. slot; 75. side groove; 8. positioning plate; 9. guide groove; 10. guide rod; 11. push block; 12. positioning groove. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0017] See also Figure 1-4 The utility model provides a technical solution: a brake master cylinder piston device, including a piston body 1, both ends of the piston body 1 are fixedly connected with end heads 2, the two end heads 2 are set in a truncated cone shape, the outer walls of the two end heads 2 are sleeved with a first sealing sleeve 4, one side of the two first sealing sleeves 4 is symmetrically provided with two push blocks 11, the four push blocks 11 are set in an arc shape, and the four push blocks 11 are respectively tightly fitted with the outer sides of the two first sealing sleeves 4; four guide grooves 9 are provided on the outer walls of the two end heads 2, and the bottom ends of the four push blocks 11 are fixedly connected with the guide grooves 9 on both sides. An adapted guide rod 10, the bottom ends of which are respectively slidably connected to the inner sides of the guide grooves 9; a fixed plate 5 is provided on the side of the two end heads 2 away from the piston body 1, a pushing mechanism 6 is provided between the two fixed plates 5 and the corresponding push blocks 11, and an elastic mechanism 7 is provided between the two fixed plates 5 and the corresponding end heads 2. The first sealing sleeve 4 is pushed by the push block 11, and the inner diameter and outer diameter of the first sealing sleeve 4 will be expanded, so that the outer wall of the first sealing sleeve 4 is still tightly fitted with the inner wall of the cylinder body, thereby ensuring the sealing, and then ensuring the braking effect of the car, which is safer.

[0018] The four pushing mechanisms 6 each include a connecting rod 61, a first fixed block 62, and a second fixed block 63. The first fixed block 62 is fixedly connected to the center of the push block 11, and the second fixed block 63 is fixedly connected to the outside of the fixed plate 5. The first fixed block 62 and the second fixed block 63 are connected by the connecting rod 61. During the movement of the fixed plate 5, the two pushing blocks 11 are pushed by the two connecting rods 61 to move along the outer wall of the end head 2. The first sealing sleeve 4 is squeezed by the pushing block 11 and also moves along the outer wall of the end head 2. The two ends of the connecting rod 61 are respectively connected to the first fixed block 62 and the second fixed block 63. The fixed block 62 and the second fixed block 63 are rotatably connected; the two elastic mechanisms 7 each include a plug post 71, a plurality of side blocks 72, a spring 73, a slot 74 and a plurality of side grooves 75, the slot 74 is opened on the outside of the end 2, and a plug post 71 adapted to the slot 74 is fixedly connected at the center position of one side of the fixed disk 5, one end of the plug post 71 is movably inserted in the slot 74, and a spring 73 is fixedly connected to the inner wall of the slot 74, and the diameter of the spring 73 is adapted to the inner diameter of the slot 74, and one end of the plug post 71 located in the slot 74 is fixedly connected to the end of the spring 73, and the side wall of the slot 74 is fixedly connected to the end of the spring 73. A plurality of side grooves 75 are provided, and a plurality of side blocks 72 adapted to the side grooves 75 are provided on the outer side wall of the plug column 71. The plurality of side blocks 72 are respectively slidably connected to the plurality of side grooves 75. The spring 73 in the slot 74 is in a stretched state. During the movement of the piston body 1, the fixed plate 5 will approach the end head 2 through the restoring force of the spring 73 and the hydraulic pressure of the inner wall of the cylinder body; the two ends 2 are fixedly connected to the side close to the piston body with the second sealing sleeve 3, and the two second sealing sleeves 3 are both sleeved on the outer periphery of the piston body 1, and the second sealing sleeve 3 plays a role of auxiliary sealing, which further step to ensure the sealing effect; two positioning grooves 12 are provided on one side of the two end heads 2 close to the fixed disk 5, and the four positioning grooves 12 are respectively located on both sides of the two slots 74, and one side of the two fixed disks 5 is fixedly connected with two positioning plates 8 adapted to the positioning grooves 12, and the four positioning plates 8 are respectively located on both sides of the two plug posts 71, and the four positioning plates 8 and the four positioning grooves 12 are all set to be arc-shaped, and the four positioning plates 8 are respectively movably inserted in the four positioning grooves 12, and the positioning plates 8 cooperate with the positioning grooves 12 to further ensure the stability of the fixed disk 5 during movement.

[0019] Specifically, when the utility model is used, when the first sealing sleeve 4 is damaged due to long-term friction with the inner wall of the master cylinder, the outer side of the first sealing sleeve 4 is no longer tightly fitted with the inner wall of the master cylinder, and the spring 73 in the slot 74 is in a stretched state. During the movement of the piston body 1, the fixed plate 5 will approach the end head 2 through the restoring force of the spring 73 and the hydraulic pressure of the inner wall of the cylinder body. During the movement, the fixed plate 5 will push the two push blocks 11 to move along the outer wall of the end head 2 through the two connecting rods 61. The push blocks 11 have a certain deformation ability. The first sealing sleeve 4 will also move along the outer wall of the end head 2 under the squeezing of the push blocks 11. Since the end head 2 is a truncated cone, the inner diameter and outer diameter of the first sealing sleeve 4 will be enlarged, so that the outer wall of the first sealing sleeve 4 is still tightly fitted with the inner wall of the cylinder body, thereby ensuring the sealing performance, and then ensuring the braking effect of the vehicle, which is safer. A second sealing sleeve 3 is also provided on one side of the first sealing sleeve 4 to play a role of auxiliary sealing and further ensure the sealing effect.

[0020] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A brake master cylinder piston device, comprising a piston body (1), characterized in that: The piston body (1) is fixedly connected to an end head (2) at both ends, and the two end heads (2) are both truncated in shape. The outer side walls of the two end heads (2) are sleeved with a first sealing sleeve (4). Two push blocks (11) are symmetrically provided on one side of the two first sealing sleeves (4). The four push blocks (11) are all arc-shaped, and the four push blocks (11) are respectively tightly fitted with the outer sides of the two first sealing sleeves (4); four guide grooves (9) are provided on the outer side walls of the two end heads (2), and both sides of the bottom ends of the four push blocks (11) are fixedly connected with guide rods (10) adapted to the guide grooves (9), and the bottom ends of a plurality of the guide rods (10) are respectively slidably connected with the inner sides of a plurality of the guide grooves (9); a fixed plate (5) is provided on the side of the two end heads (2) away from the piston body (1), a pushing mechanism (6) is provided between the two fixed plates (5) and the corresponding push blocks (11), and an elastic mechanism (7) is provided between the two fixed plates (5) and the corresponding end heads (2).

2. A brake master cylinder piston device according to claim 1, characterized in that: The four pushing mechanisms (6) each comprise a connecting rod (61), a first fixed block (62) and a second fixed block (63); the first fixed block (62) is fixedly connected to the center position of the pushing block (11); the second fixed block (63) is fixedly connected to the outer side of the fixed plate (5); the first fixed block (62) and the second fixed block (63) are connected via the connecting rod (61); and two ends of the connecting rod (61) are rotatably connected to the first fixed block (62) and the second fixed block (63) respectively.

3. A brake master cylinder piston device according to claim 1, characterized in that: The two elastic mechanisms (7) each comprise a plug post (71), a plurality of side blocks (72), a spring (73), a slot (74) and a plurality of side grooves (75), wherein the slot (74) is provided on the outside of the end head (2), a plug post (71) matched with the slot (74) is fixedly connected at the center position of one side of the fixed plate (5), one end of the plug post (71) is movably inserted in the slot (74), a spring (73) is fixedly connected to the inner wall of the slot (74), the diameter of the spring (73) is matched with the inner diameter of the slot (74), one end of the plug post (71) located in the slot (74) is fixedly connected to the end of the spring (73), a plurality of side grooves (75) are provided on the side wall of the slot (74), a plurality of side blocks (72) matched with the side grooves (75) are provided on the outer wall of the plug post (71), and a plurality of the side blocks (72) are respectively slidably connected to the plurality of side grooves (75).

4. A brake master cylinder piston device according to claim 1, characterized in that: A second sealing sleeve (3) is fixedly connected to one side of the two end heads (2) close to the piston body, and the two second sealing sleeves (3) are sleeved on the periphery of the piston body (1).

5. A brake master cylinder piston device according to claim 1, characterized in that: Two positioning grooves (12) are provided on one side of the two end heads (2) close to the fixed disk (5); the four positioning grooves (12) are respectively located on both sides of the two slots (74); one side of the two fixed disks (5) is fixedly connected with two positioning plates (8) adapted to the positioning grooves (12); the four positioning plates (8) are respectively located on both sides of the two plug posts (71); the four positioning plates (8) and the four positioning grooves (12) are all arranged in an arc shape; the four positioning plates (8) are respectively movably inserted in the four positioning grooves (12).

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