Oil pressure brake with double-sealing structure

Abstract

An oil pressure brake with a double-sealing structure comprises a brake pump body, a brake handle and an oil pipe assembly. The brake pump body is provided with a pressure cylinder and an oil storage cylinder, a piston push rod assembly acted by the brake handle is arranged in the pressure cylinder, and the pressure cylinder is communicated with the oil storage cylinder through an oil pressure adjusting hole. The piston push rod assembly comprises a front piston rod and a rear piston rod, a pushing cavity is formed in the rear piston rod, and the front piston rod can enter the pushing cavity; the front piston rod is provided with an oil guide cavity and an oil overflow hole; the front piston rod is further sleeved with a one-way piston oil seal, the one-way piston oil seal abuts against the inner wall of the pressure cylinder, and the one-way piston oil seal is located on the front side of the oil overflow hole. The hydraulic brake has the advantages that a new oil way is formed through the oil guide cavity and the oil overflow hole formed in the front piston rod, so that only one oil pressure adjusting hole is reserved between the pressure cylinder and the oil storage cylinder, only one one-way piston oil seal is used on the piston push rod assembly, and the brake use function can be achieved.

Description

Technical Field

[0001] This utility model relates to the technical field of brakes in transportation vehicles, and in particular to a hydraulic brake with a double sealing structure. Background Technology

[0002] A brake is a device that decelerates, stops, or keeps a moving part (or machine) at a stop. It is a mechanical component that stops or slows down moving parts in machinery. Commonly known as a brake or decelerator. A brake mainly consists of a frame, braking components, and an operating mechanism.

[0003] Brakes, a type of braking device, are a crucial element in ensuring vehicle safety. The quality of brakes often affects the life safety of riders, especially for riders who frequently need to compete at high speeds. If the structure and efficiency of the brakes are not adequate, even the most skilled rider will not be able to control the bicycle at will. Especially at high speeds, both impulse and kinetic energy reach their maximum values. If braking cannot be performed smoothly, the lives of both the rider and others cannot be guaranteed, and it may even cause large-scale disasters.

[0004] In vehicles such as bicycles, electric bikes, and motorcycles, the device used to control braking is called a brake lever (commonly known as a brake handle). The brake lever is a handle used when braking, and it's found on bicycle brake levers, children's bicycle brake levers, electric bike brake levers, and motorcycle brake levers. Traditionally, during the installation of brake cables on electric bikes, bicycles, and tricycles, wire cutters, wrenches, and other conventional tools are used in conjunction with brute force to tighten them. This traditional method of tightening the cables has many drawbacks and is difficult to operate. For example, the cables easily slip from the wire cutters or wrench, and it's not easy to adjust the tightness, making it particularly time-consuming and laborious. In pursuit of braking efficiency and precision, hydraulic brakes are now widely used in vehicles on the market (such as cars, motorcycles, and bicycles). For example, patent document TWM357417U describes a hydraulic brake system where one end of an oil pipe assembly is connected to the output end of the internal oil circuit of a brake lever seat, while the other end of the oil pipe assembly is connected to a disc brake. Pressing the brake lever will push a piston rod in the internal oil circuit, causing the pressure in the oil circuit to act on the disc brake through the oil pipe assembly, thus creating the operation of disc braking.

[0005] However, existing hydraulic brakes have structural defects that can lead to seal failure during use. Referring to patent document CN218641014U, a segmented power-assisted brake is disclosed, comprising: a brake pump body with a pressure cylinder and an oil reservoir connected to each other, the pressure cylinder containing a piston rod assembly; a brake handle connected to one end of the brake pump body; an oil pipe assembly connected to the other end of the brake pump body; the piston rod assembly includes at least a moving piston rod and a fixed piston rod, the moving piston rod being kinetically connected to the brake handle so that the moving piston rod can be displaced relative to the fixed piston rod; the oil reservoir and the pressure cylinder are connected through a first oil inlet, the pressure cylinder and the interior of the moving piston rod are connected through a second oil inlet, and the fixed piston rod is always connected to the interior of the moving piston rod; the moving piston rod has a first sealing section, and the fixed piston rod has a second sealing section. Furthermore, a first pressure regulating oil hole and a second pressure regulating oil hole are provided between the oil reservoir and the pressure cylinder, and the first oil inlet, the first sealing section, and the second sealing section are all located between the first pressure regulating oil hole and the second pressure regulating oil hole. Brake fluid can flow adaptively through the first and second pressure regulating ports according to the pressure difference between the reservoir and the pressure cylinder.

[0006] In the aforementioned patent, the pressure cylinder and the oil reservoir have a first pressure regulating oil port, a first oil supply port, and a second pressure regulating oil port. The multiple ports are arranged with varying diameters depending on their usage and throughput; some have larger diameters, while others have smaller diameters. In particular, the smaller diameter ports are difficult to deburr due to their size, resulting in rougher surfaces. During use, the piston rod assembly drives the seal to move back and forth continuously. The seal repeatedly contacts the ports during this movement, and burrs at the ports scratch the seal, damaging it and reducing or even eliminating the sealing effect. Furthermore, to accommodate the oil circuit, two one-way piston oil seals need to be installed on the piston rod assembly (front piston rod), increasing the likelihood of oil leakage and raising costs. Summary of the Invention

[0007] In order to overcome the above-mentioned shortcomings of the prior art, this utility model provides a hydraulic brake with a double sealing structure. The adjustment and upgrading of the hole position and oil circuit allows the brake function to be realized with only one one-way piston oil seal. At the same time, it also eliminates the burrs in the hole position and prevents the one-way piston oil seal from being damaged.

[0008] The technical solution of this utility model to solve its technical problem is: a hydraulic brake with a double sealing structure, including a brake pump body, a brake handle connected to one end of the brake pump body, and an oil pipe assembly connected to the other end of the brake pump body.

[0009] The brake pump body is equipped with a pressure cylinder and an oil reservoir. The pressure cylinder contains a piston push rod assembly that is actuated by the brake handle. The pressure cylinder is connected to the oil reservoir through an oil pressure regulating hole. The piston push rod assembly includes a front piston rod and a rear piston rod. The rear piston rod has a push chamber, and the rear end of the front piston rod can enter the push chamber.

[0010] The front piston rod has an oil guide cavity, and the side wall of the front piston rod has a through oil overflow hole, which is connected to the oil guide cavity.

[0011] The front piston rod is also fitted with a one-way piston oil seal, which abuts against the inner wall of the pressure cylinder and is located in front of the overflow hole.

[0012] In the initial stage of squeezing the brake lever, the overflow hole and the rear piston rod are offset from each other; the piston push rod assembly drives the one-way piston oil seal to move forward, and the one-way piston oil seal squeezes the brake oil in the pressure cylinder and causes a part of the brake oil to enter the oil reservoir after passing through the oil guide chamber, the overflow hole and the oil pressure regulating hole; the other part of the brake oil flows to the oil pipe assembly.

[0013] In the middle and rear section of the brake lever, the rear end of the front piston rod enters the push chamber, and the front end of the rear piston rod abuts against the one-way piston oil seal and blocks the overflow hole; the piston push rod assembly drives the one-way piston oil seal to move forward, and the one-way piston oil seal squeezes the brake oil in the pressure cylinder and causes the brake oil to flow to the oil pipe assembly.

[0014] In some preferred embodiments of this utility model, a first elastic element is provided between the front end of the front piston rod and the pressure cylinder, and a second elastic element is provided between the rear end of the front piston rod and the rear piston rod.

[0015] As a further limitation of the above embodiment, the spring force of the first elastic member is greater than the spring force of the second elastic member.

[0016] In some preferred embodiments of this utility model, the outer wall of the front piston rod is provided with an assembly groove, and the one-way piston oil seal is embedded in the assembly groove.

[0017] A further configuration of the aforementioned technical solution is that the front side of the one-way piston oil seal is the sealing side, which abuts against the inner wall of the pressure cylinder; the rear side of the one-way piston oil seal is the non-sealing side, and there is an oil passage gap between the non-sealing side and the inner wall of the pressure cylinder.

[0018] A further provision of the aforementioned technical solution is that a bidirectional seal is fitted on the outer wall of the rear piston rod, and the bidirectional seal abuts against the inner wall of the pressure cylinder.

[0019] The beneficial effects of this utility model are as follows:

[0020] 1. By forming an oil guide cavity and an overflow hole on the front piston rod, a new oil passage is created. Therefore, only one oil pressure regulating hole is retained between the pressure cylinder and the oil reservoir, and only one one-way piston oil seal is used on the piston push rod assembly to achieve the braking function.

[0021] Second, unnecessary holes are eliminated on the brake pump body. The oil pressure regulating hole has a large diameter, so it can be precision machined to remove surface burrs. This prevents the one-way piston oil seal from being scratched by burrs during the movement of the piston push rod assembly, thus providing effective protection.

[0022] Third, the single one-way piston oil seal serves both to boost brake fluid and to provide a one-way seal during braking. It can also block the overflow hole at certain stages.

[0023] Fourth, it reduces the number of one-way piston oil seals, thereby reducing the chance of oil leakage and lowering the difficulty of the process and the cost of parts. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the appearance structure of this utility model.

[0025] Figure 2 This is an exploded schematic diagram of this utility model.

[0026] Figure 3 This is a cross-sectional view of the present invention in the initial braking stage.

[0027] Figure 4 This is a cross-sectional view of the present invention in the middle and later stages of braking.

[0028] Figure 5 This is a schematic diagram of the front piston rod.

[0029] Figure 6 This is a schematic diagram of the rear piston rod.

[0030] Figure 7 This is a schematic diagram of the front and rear piston rods during the initial braking phase.

[0031] Figure 8 This is a schematic diagram of the front and rear piston rods during the middle to later stages of braking.

[0032] Figure 9 This is a schematic diagram of a one-way piston oil seal.

[0033] Figure 10 This is a schematic diagram of the fit between a one-way piston oil seal and a pressure cylinder.

[0034] In the diagram: 1. Brake pump body; 101. Pressure cylinder; 102. Oil reservoir; 103. Oil pressure regulating hole; 2. Brake handle; 3. Oil pipe assembly; 4. Front piston rod; 401. Oil guide chamber; 402. Oil overflow hole; 403. Assembly groove; 5. Rear piston rod; 501. Push chamber; 6. One-way piston oil seal; 601. Sealing side; 602. Non-sealing side; 7. First elastic element; 8. Second elastic element; 9. Oil passage gap; 10. Bidirectional seal. Detailed Implementation

[0035] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments are merely specific descriptions of the present invention, and their purpose is to enable those skilled in the art to better understand the technical solution of the present invention, and should not be regarded as limitations on the present invention.

[0036] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0037] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0038] Example 1

[0039] Reference Figures 1-10 A hydraulic brake with a double sealing structure includes a brake pump body 1, a brake handle 2 connected to one end of the brake pump body 1, and an oil pipe assembly 3 connected to the other end of the brake pump body 1.

[0040] The brake pump body 1 is provided with a pressure cylinder 101 and an oil reservoir 102. The pressure cylinder 101 is provided with a piston push rod assembly that is actuated by the brake handle 2. The pressure cylinder 101 is connected to the oil reservoir 102 through an oil pressure regulating hole 103. The piston push rod assembly includes a front piston rod 4 and a rear piston rod 5. The rear piston rod 5 has a push chamber 501. The rear end of the front piston rod 4 can enter the push chamber 501.

[0041] The front piston rod 4 has an oil guide cavity 401, and the side wall of the front piston rod 4 has a through oil overflow hole 402, which communicates with the oil guide cavity 401.

[0042] The front piston rod 4 is also fitted with a one-way piston oil seal 6, which abuts against the inner wall of the pressure cylinder 101 and is located in front of the overflow hole 402.

[0043] The above describes the basic structural design of this utility model. During operation, the oil circuit changes depending on the degree to which the brake handle 2 is squeezed. The specific working principle is as follows:

[0044] Reference Figure 3 , Figure 7 In the initial stage of squeezing the brake lever 2, the overflow hole 402 and the rear piston rod 5 are offset from each other. The piston push rod assembly drives the one-way piston oil seal 6 to move forward. The one-way piston oil seal 6 squeezes the brake fluid in the pressure cylinder 101, causing a portion of the brake fluid to pass through the guide chamber 401, the overflow hole 402, and the oil pressure regulating hole 103 before entering the reservoir cylinder 102. The other portion of the brake fluid flows towards the oil pipe assembly 3. During this stage, some of the brake fluid in the pressure cylinder 101 flows back into the reservoir cylinder 102, and some brake fluid acts on the brake pads through the oil pipe assembly 3. Therefore, the feel when squeezing the brake lever 2 is relatively light (low resistance), and the corresponding braking force is not strong, which is a light braking effect.

[0045] Reference Figure 4 , Figure 8 In the middle and rear section of the brake lever 2, the rear end of the front piston rod 4 enters the push chamber 501, and the front end of the rear piston rod 5 abuts against the one-way piston oil seal 6, sealing the overflow hole 402; the piston push rod assembly drives the one-way piston oil seal 6 forward, and the one-way piston oil seal 6 squeezes the brake fluid in the pressure cylinder 101, causing the brake fluid to flow towards the oil pipe assembly 3. During this stage, refer to... Figure 10The brake fluid acts on the sealing side 601 of the one-way piston oil seal 6 in a rearward direction, while the front end of the rear piston rod 5 acts on the one-way piston oil seal 6 in a forward direction. The combined action of the two causes a tight fit between the rear end of the one-way piston oil seal 6 and the front end of the rear piston rod 5, completely blocking the oil passage back to the reservoir 102. Therefore, all the brake fluid will act on the brake pads through the oil pipe assembly 3, resulting in a strong braking force when the brake lever 2 is squeezed, which is a heavy braking effect.

[0046] The combined effect of the initial and middle-to-late braking stages results in a more linear braking force that increases from small to large and a braking effect that increases from light to heavy.

[0047] When the brake lever 2 is released, because a one-way piston oil seal 6 is used, the brake fluid can be replenished into the pressure cylinder 101 through the gap between the one-way piston oil seal 6 and the pressure cylinder 101 (i.e., the subsequent oil passage gap 9), so that the pressure in the oil circuit reaches a balance and the brake lever 2 returns to the initial position.

[0048] In summary, the structural changes and advantages of this utility model compared to the prior art are as follows: First, by forming an oil guide cavity 401 and an overflow hole 402 on the front piston rod 4, a new oil passage is formed. Therefore, only one oil pressure regulating hole 103 is retained between the pressure cylinder 101 and the oil reservoir 102, and only one one-way piston oil seal 6 is used on the piston push rod assembly to achieve the braking function. Second, by eliminating redundant holes on the brake pump body 1, the diameter of the oil pressure regulating hole 103 is relatively large, so it can be precision machined to remove surface burrs, thereby preventing the one-way piston oil seal 6 from being scratched by burrs during the movement of the piston push rod assembly, thus providing effective protection. Third, the single one-way piston oil seal 6 serves both to assist in pushing brake fluid and to provide a one-way seal during braking, and can also seal the overflow hole 402 at certain stages. Fourth, by reducing the number of one-way piston oil seals 6, the probability of oil leakage is reduced, and the process difficulty and component costs are lowered.

[0049] Example 2

[0050] In some preferred embodiments of this utility model, a first elastic element 7 is provided between the front end of the front piston rod 4 and the pressure cylinder 101, and a second elastic element 8 is provided between the rear end of the front piston rod 4 and the rear piston rod 5. The spring force of the first elastic element 7 is greater than the spring force of the second elastic element 8.

[0051] The working principle of this embodiment is as follows: (Refer to...) Figures 2-4When the user squeezes the brake lever 2 initially, the rear piston rod 5 mainly moves the front piston rod 4 forward through the second elastic element 8. Furthermore, due to the difference between the first elastic element 7 and the second elastic element 8, the forward movement of the rear piston rod 5 is greater than that of the front piston rod 4. In the middle to later stages of squeezing the brake lever 2, the second elastic element 8 is compressed to its minimum, and the rear piston rod 5 abuts against the one-way piston oil seal 6. At this point, the rear piston rod 5 blocks the overflow hole 402. When the brake lever 2 is squeezed further, the rear piston rod 5 and the front piston rod 4 move forward together (at this point, the rear piston rod 5 mainly moves the front piston rod 4 through the one-way piston oil seal 6, with the same forward movement), further compressing the first elastic element 7.

[0052] After the brake lever 2 is released, the front piston rod 4 and the rear piston rod 5 return to their initial positions under the action of the first elastic element 7, the second elastic element 8, and the return pressure of the brake fluid.

[0053] The provision of the second elastic element 8 in this embodiment is a preferred solution. However, this element can also be omitted, and the basic function of this utility model can still be achieved.

[0054] Example 3

[0055] In some preferred embodiments of this utility model, reference is made to Figure 5 The outer wall of the front piston rod 4 is provided with an assembly groove 403, and the one-way piston oil seal 6 is embedded in the assembly groove 403 to achieve the positioning and assembly of the one-way piston oil seal 6. In particular, when the rear piston rod 5 abuts against the one-way piston oil seal 6 and applies pressure, the one-way piston oil seal 6 can always maintain a stable position relative to the front piston rod 4, ensuring the sealing effect and the sealing effect of the overflow hole 402.

[0056] Example 4

[0057] Regarding the preferred sealing structure inside the brake in this utility model, refer to... Figures 9-10 The details are as follows:

[0058] 1. The front side of the one-way piston oil seal 6 is the sealing side 601, which abuts against the inner wall of the pressure cylinder 101; the rear side of the one-way piston oil seal 6 is the non-sealing side 602, and there is an oil passage gap 9 between the non-sealing side 602 and the inner wall of the pressure cylinder 101. When the brake handle 2 is squeezed, the piston push rod assembly is pushed forward, and a sealing fit is formed between the one-way piston oil seal 6 and the pressure cylinder 101 to push the brake fluid in front of the front piston rod 4 forward; when the brake handle 2 is released, the piston push rod assembly moves backward, and the brake fluid in the reservoir 102 enters the front side of the front piston rod 4 through the oil passage gap 9 to fill the space gap during retraction, so as to balance the front and rear pressure and return smoothly to the original position.

[0059] 2. A bidirectional seal 10 is fitted on the outer wall of the rear piston rod 5, and the bidirectional seal 10 abuts against the inner wall of the pressure cylinder 101. When the rear piston rod 5 moves back and forth, the bidirectional seal 10 and the inner wall of the pressure cylinder 101 always maintain a sealed fit, thereby effectively preventing brake fluid leakage from the pressure cylinder 101.

[0060] It is worth noting that the other technical solutions of this utility model are all existing technologies, and therefore will not be described in detail.

[0061] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the concept of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. An oil brake with double sealing structure, comprising a brake pump body (1), a brake handle (2) connected to one end of the brake pump body (1), and an oil pipe assembly (3) connected to the other end of the brake pump body (1). The brake pump body (1) is provided with a pressure cylinder (101) and an oil storage cylinder (102), the pressure cylinder (101) is provided with a piston push rod assembly acted by the brake handle (2), and the pressure cylinder (101) and the oil storage cylinder (102) are in communication through an oil pressure adjusting hole (103); the piston push rod assembly comprises a front piston rod (4) and a rear piston rod (5), the rear piston rod (5) is provided with a push cavity (501), and the rear end of the front piston rod (4) can enter the push cavity (501). characterized in that The front piston rod (4) is provided with a guide oil cavity (401), and the side wall of the front piston rod (4) is provided with a through oil overflow hole (402) in communication with the guide oil cavity (401). The front piston rod (4) is further provided with a one-way piston oil seal (6), the one-way piston oil seal (6) abuts against the inner wall of the pressure cylinder (101), and the one-way piston oil seal (6) is located on the front side of the oil overflow hole (402). In the initial stage of pinching the brake handle (2), the oil overflow hole (402) is staggered with the rear piston rod (5); the piston push rod assembly drives the one-way piston oil seal (6) to move forward, the one-way piston oil seal (6) extrudes the brake oil in the pressure cylinder (101) and makes part of the brake oil flow into the oil storage cylinder (102) through the guide oil cavity (401), the oil overflow hole (402) and the oil pressure adjusting hole (103) in sequence; the other part of the brake oil flows to the oil pipe assembly (3). In the middle and rear stages of pinching the brake handle (2), the rear end of the front piston rod (4) enters the push cavity (501), the front end of the rear piston rod (5) abuts against the one-way piston oil seal (6) and blocks the oil overflow hole (402); the piston push rod assembly drives the one-way piston oil seal (6) to move forward, the one-way piston oil seal (6) extrudes the brake oil in the pressure cylinder (101) and makes the brake oil flow to the oil pipe assembly (3).

2. The oil brake with a double seal structure according to claim 1, characterized in that: The first elastic member (7) is arranged between the front end of the front piston rod (4) and the pressure cylinder (101), and the second elastic member (8) is arranged between the rear end of the front piston rod (4) and the rear piston rod (5).

3. The oil brake with a double seal structure according to claim 2, characterized in that: The spring force of the first elastic member (7) is greater than the spring force of the second elastic member (8).

4. The oil brake with a double seal structure according to claim 1, wherein: The outer wall of the front piston rod (4) is provided with an assembly groove (403), and the one-way piston oil seal (6) is embedded in the assembly groove (403).

5. The oil brake with a double seal structure according to claim 1, wherein: The front side of the one-way piston oil seal (6) is a sealing side (601) abutting against the inner wall of the pressure cylinder (101), and the rear side of the one-way piston oil seal (6) is a non-sealing side (602) having an oil passing gap (9) with the inner wall of the pressure cylinder (101).

6. The oil brake with a double seal structure according to claim 1, wherein: The outer wall of the rear piston rod (5) is sleeved with a bidirectional sealing element (10), and the bidirectional sealing element (10) is in abutment with the inner wall of the pressure cylinder (101).

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