Brake upper pump with anti-wear and easy maintenance functions

Abstract

A brake upper pump with wear resistance and easy maintenance includes a brake pump body with an internal oil chamber; a piston movably disposed within the oil chamber; a booster rod with its front end extending into the oil chamber and abutting against the piston; and a brake handle that rotates with the brake pump body and is connected to the booster rod for transmission. The piston and oil chamber are coaxially arranged, while the piston and booster rod are non-coaxial, thus forming a strong-side contact area and a weak-side contact area between the booster rod and the piston. A wear-prone area and a non-wear-prone area are formed between the outer wall of the piston and the inner wall of the oil chamber, wherein the wear-prone area and the strong-side contact area are located on the same side. The pump also includes a wear-resistant component disposed in the wear-prone area between the outer wall of the piston and the inner wall of the oil chamber. This invention effectively improves the wear resistance of the wear-prone area, reduces wear, and extends the service life of the brake upper pump.

Description

Technical Field

[0001] This utility model relates to the technical field of brake devices, and in particular to a brake upper pump with wear resistance and easy maintenance functions. Background Technology

[0002] The upper brake pump is a key component of a vehicle's braking system. Its main function is to push the piston in the oil chamber by operating the brake lever, thereby compressing the brake fluid and transmitting the pressure to the lower brake pump to achieve vehicle braking.

[0003] In existing technology, the piston and booster rod of the brake booster pump are usually not coaxial. Specifically, the piston moves linearly along the piston chamber, while the brake lever rotates around its pivot point. The brake lever and piston are connected by the booster rod; that is, during the transmission process of brake lever-booster rod-piston, the rotational force needs to be converted into linear thrust. Based on the characteristics of force, the above features will create a strong-side contact area and a weak-side contact area between the booster rod and the piston. Correspondingly, a wear-prone area and a non-wear-prone area will also be formed between the outer wall of the piston and the inner wall of the oil chamber, with the wear-prone area and the strong-side contact area located on the same side.

[0004] Because easily worn areas are subjected to high friction for extended periods, they are prone to wear. This not only affects the normal operation of the brake upper cylinder, leading to decreased braking performance, but also shortens the service life of the brake upper cylinder. Furthermore, when wear occurs in easily worn areas, especially when the brake pump body itself is worn, the entire brake pump body usually needs to be replaced. This maintenance process is cumbersome and costly, essentially rendering the brake pump body unusable, placing a significant burden on the user.

[0005] Therefore, developing a brake pump that can effectively improve the wear resistance of easily worn areas while being easy to maintain is of great practical significance. Summary of the Invention

[0006] In order to overcome the above-mentioned shortcomings of the prior art, this utility model provides a brake upper pump with wear resistance and easy maintenance, aiming to solve the problems of rapid wear in the wear-prone areas of the brake upper pump, high maintenance costs and complicated maintenance.

[0007] The technical solution of this utility model to solve its technical problem is: a brake upper pump with wear resistance and easy maintenance, comprising:

[0008] The brake pump body has an internal oil chamber filled with brake fluid.

[0009] A piston, which is movably disposed within the oil chamber;

[0010] The push rod extends into the oil chamber and abuts against the piston, so that the push rod and the piston form a transmission engagement.

[0011] The brake handle is pivotally coupled to the brake pump body via a pivoting mechanism, and is connected to the power assist rod via a rotary push mechanism to form a transmission engagement.

[0012] The piston and the oil chamber are coaxially arranged along the piston, while the piston and the booster rod are not coaxially arranged, thus forming a strong side contact area and a weak side contact area between the booster rod and the piston; a wear-prone area and a non-wear-prone area are formed between the outer wall of the piston and the inner wall of the oil chamber, wherein the wear-prone area and the strong side contact area are located on the same side, and the non-wear-prone area and the weak side contact area are located on the same side.

[0013] It also includes wear-resistant components, which are disposed in the wear-prone area between the outer wall of the piston and the inner wall of the oil chamber.

[0014] The wear-resistant component is detachably connected between the outer wall of the piston and the inner wall of the oil chamber.

[0015] By adopting the above structural design, the wear that originally occurred on the brake pump body is transferred to the wear-resistant parts through the setting of wear-resistant parts, providing effective protection for the brake body, improving the wear resistance of easily worn areas, and extending the service life of the upper brake pump.

[0016] Furthermore, the wear-resistant part has a limiting rib, and the inner wall of the oil cavity is provided with a limiting step. The limiting rib abuts against the limiting step so that a pre-positioning fit is formed between the wear-resistant part and the inner wall of the oil cavity.

[0017] The wear-resistant part is provided with a sealing groove, and a sealing element is provided in the sealing groove. The sealing element abuts against the inner wall of the oil cavity to form a sealing fit.

[0018] The combination of the limiting rib and the limiting step allows for pre-positioning of wear-resistant parts during installation, ensuring the accuracy of the installation position. At the same time, the seal prevents brake fluid leakage from the oil chamber, ensuring the normal operation of the brake pump.

[0019] Furthermore, both the outer wall of the wear-resistant component and the inner wall of the oil cavity are provided with corresponding fixing grooves, and retaining rings are inserted into the fixing grooves. The retaining rings can firmly fix the wear-resistant component to the inner wall of the oil cavity, preventing the wear-resistant component from shifting during piston movement.

[0020] In an optional embodiment of this invention, the wear-resistant component is a wear-resistant sleeve having an accommodating inner cavity. The power assist rod and piston at least partially extend into the accommodating inner cavity, and the contact point between the power assist rod and the piston is located within the accommodating inner cavity. The wear-resistant sleeve can simultaneously protect the contact area between the power assist rod and the piston, as well as the easily worn area between the piston and the inner wall of the oil chamber, further improving the wear resistance of the brake upper pump.

[0021] In an optional embodiment of this utility model, the wear-resistant component includes a carrier, a first wear-resistant block, and a second wear-resistant block;

[0022] The first wear-resistant block is installed on the inner side of the carrier, and the first wear-resistant block is aligned with the strong side contact area; the second wear-resistant block is installed on the outer side of the carrier, and the second wear-resistant block is aligned with the easily worn area.

[0023] Wear-resistant parts with the above structure can provide targeted protection for areas with strong contact and areas prone to wear, thereby improving the efficiency of wear-resistant parts.

[0024] Furthermore, the carrier is provided with a plurality of receiving slots, and the first wear-resistant block and the second wear-resistant block are respectively assembled into the corresponding receiving slots, and the inner surface of the first wear-resistant block is flush with the inner surface of the carrier, and the outer surface of the second wear-resistant block is flush with the outer surface of the carrier.

[0025] The flush design after installation ensures smooth piston movement and avoids obstruction of piston movement due to protruding wear-resistant blocks.

[0026] In an optional embodiment of this invention, the wear-resistant component is a wear-resistant plate, which is located in the easily worn area and is installed on the inner wall of the oil chamber or the outer wall of the piston. The wear-resistant plate has a simple structure, is easy to install, and its installation position can be flexibly selected according to the actual wear conditions.

[0027] In an optional embodiment of this invention, the wear-resistant component is a wear-resistant coating applied to the outer wall of the piston and / or the inner wall of the oil cavity.

[0028] Preferably, the wear-resistant part is made of one or more of reinforced polytetrafluoroethylene, ultra-high molecular weight polyethylene, polyoxymethylene, and polyetheretherketone. These materials possess excellent wear resistance and self-lubricating properties, effectively improving the service life of the wear-resistant part.

[0029] The beneficial effects of this utility model are as follows:

[0030] First, by setting wear-resistant parts in the easily worn area between the outer wall of the piston and the inner wall of the oil chamber, the wear resistance of the easily worn area can be effectively improved, the occurrence of wear can be reduced, and the service life of the brake pump can be extended.

[0031] Second, the wear-resistant parts adopt a detachable connection method. When the wear-resistant parts are worn, only the wear-resistant parts need to be replaced, without replacing the entire piston or brake pump body, which reduces maintenance costs and makes the maintenance process simpler.

[0032] Third, the wear-resistant parts have multiple structural designs that can adapt to different usage scenarios and needs, improving the applicability of the brake pump.

[0033] Fourth, the push rod and piston adopt a ball head and hemispherical groove matching method, which ensures the flexibility and stability of the transmission between the two and reduces the additional wear caused by improper matching.

[0034] Fifth, the materials selected for the wear-resistant parts have excellent properties, which further ensures the wear resistance and service life of the brake pump. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of this utility model.

[0036] Figure 2 This is the front view of the present invention (without the brake handle being squeezed).

[0037] Figure 3 This is a cross-sectional view and a partial enlarged view of the present invention (without the brake handle being squeezed).

[0038] Figure 4 This is the front view of the present invention (squeezing the brake handle).

[0039] Figure 5 This is a cross-sectional view and a partial enlarged view of the present invention (squeezing the brake handle).

[0040] Figure 6 These are cross-sectional views and enlarged views of the second scheme used in Embodiment 3.

[0041] Figure 7 These are cross-sectional views and enlarged views of the third scheme used in Embodiment 3.

[0042] Figure 8 This is a partial structural cross-sectional view of the prior art.

[0043] In the diagram: 1. Brake pump body; 11. Oil chamber; 12. Easily worn area; 13. Non-easily worn area; 14. Limiting step; 15. Fixing groove; 151. Snap ring; 2. Piston; 2a. Piston movement axis; 21. Strong side contact area; 22. Weak side contact area; 23. Hemispherical groove; 24. Sealing ring; 3. Power assist push rod; 31. Ball end; 3a. Push rod axis; 32. Contact point between power assist push rod and piston; 4. Brake handle; 41. Pivoting mechanism; 42. Rotation and pushing mechanism; 5. Wear-resistant part; 51. Limiting rib; 52. Sealing groove; 53. Sealing part; 6. Wear-resistant sleeve; 61. Accommodating cavity; 71. Carrier; 711. Accommodating groove; 72. First wear-resistant block; 73. Second wear-resistant block; 8. Wear-resistant plate body. Detailed Implementation

[0044] 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.

[0045] 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.

[0046] 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.

[0047] Example 1

[0048] Reference Figures 1 to 8A brake pump with wear resistance and easy maintenance includes: a brake pump body 1, which has an oil chamber 11 inside, the oil chamber 11 being filled with brake fluid, the oil chamber 11 providing space for the movement of a piston 2, and also serving as a storage and flow channel for the brake fluid; a piston 2, which is movably disposed within the oil chamber 11, and the piston 2 can reciprocate within the oil chamber 11, thereby compressing the brake fluid to generate pressure; a booster rod 3, the front end of which extends into the oil chamber 11 and abuts against the piston 2, so that the booster rod 3 and the piston 2 form a transmission engagement; and a brake handle 4, which forms a rotational engagement with the brake pump body 1 through a pivoting mechanism 41, and the brake handle 4 is connected to the booster rod 3 through a rotary push mechanism 42, forming a transmission engagement. When the brake handle 4 is operated, the brake handle 4 rotates around the pivoting mechanism 41, driving the booster rod 3 to move through the rotary push mechanism 42, thereby pushing the piston 2 to move within the oil chamber 11.

[0049] It is worth mentioning that the piston 2 and the oil chamber 11 are coaxially arranged along the piston 2 (piston 2 movement axis), which ensures the stability of the piston 2's movement within the oil chamber 11; the piston 2 and the assisting push rod 3 are non-coaxially arranged (piston 2 movement axis and push rod axis 3a), thus forming a strong-side contact area 21 and a weak-side contact area 22 between the assisting push rod 3 and the piston 2; a wear-prone area 12 and a non-wear-prone area 13 are formed between the outer wall of the piston 2 and the inner wall of the oil chamber 11, wherein the wear-prone area 12 and the strong-side contact area 21 are located on the same side, and the non-wear-prone area 13 and the weak-side contact area 22 are located on the same side.

[0050] It should be emphasized that a wear-resistant component 5 is also included, which is disposed in the wear-prone area 12 between the outer wall of the piston 2 and the inner wall of the oil chamber 11.

[0051] The above content constitutes the basic scheme of this utility model. Its working principle is as follows: When the brake handle 4 is operated, the brake handle 4 rotates around the pivot mechanism 41, driving the assist push rod 3 to move via the rotary push mechanism 42. Since the front end of the assist push rod 3 extends into the oil chamber 11 and abuts against the piston 2, the movement of the assist push rod 3 further pushes the piston 2 to move within the oil chamber 11. The piston 2 reciprocates within the oil chamber 11, compressing the brake fluid and generating pressure. The brake fluid transmits this pressure to components such as the brake caliper through pipelines, achieving the braking effect. During this process, the wear-resistant part 5 plays a crucial protective role. It forms a wear-resistant interface between the piston 2 and the inner wall of the oil chamber 11, reducing direct friction between the two and ensuring the normal operation of the brake pump.

[0052] In short, by incorporating wear-resistant component 5, the wear that would normally occur on the brake pump body 1 is transferred to wear-resistant component 5, providing effective protection for the brake body and improving the wear resistance of the easily worn area 12, thus extending the service life of the upper brake pump. Since wear-resistant component 5 is independently configured in the easily worn area 12, it can be easily replaced after prolonged use when wear occurs, without needing to replace the entire brake pump body 1, reducing maintenance costs and complexity.

[0053] Preferably, the wear-resistant part 5 is detachably connected between the outer wall of the piston 2 and the inner wall of the oil chamber 11. Various detachable connection methods are possible, such as slotted engagement, threaded connection, and snap-fit ​​connection, which are not specifically limited here. The advantages of using a detachable connection method include at least the following: 1. Targeted replacement, reducing maintenance costs: The wear-resistant part 5 is the component that directly bears friction and is also the part that wears out the fastest. With a detachable design, when wear occurs in the easily worn area 12, it is not necessary to replace the entire piston 2 or brake pump body 1; only the wear-resistant part 5 needs to be replaced, significantly reducing spare parts costs and material consumption during replacement. 2. Simplified maintenance process: Compared to fixed connections (such as welding or one-piece molding), the detachable structure makes the disassembly and assembly of the wear-resistant part 5 easier. Maintenance personnel can quickly complete the replacement without complex tools or professional skills, shortening maintenance time, especially suitable for routine maintenance or emergency repair scenarios. 3. Extended lifespan of core components: The piston 2 and oil chamber 11, as core structural components of the brake upper pump, have high manufacturing costs and are not easily worn. By protecting it with the removable wear-resistant part 5, the risk of core components being prematurely scrapped due to wear can be reduced, indirectly extending the service life of the entire brake pump.

[0054] In this invention, the piston 2 has a hemispherical groove 23 at its rear end, and the push rod 3 has a ball end 31 at its front end. The ball end 31 extends into the hemispherical groove 23 and abuts against it, so that the push rod 3 and the piston 2 form a transmission engagement to achieve force transmission, while allowing a certain angle of relative deflection between them. The engagement between the ball end 31 and the hemispherical groove 23 ensures flexible transmission between the push rod 3 and the piston 2 (similar to a universal joint connection), reducing the impact of installation errors or eccentric forces generated during movement on the engagement.

[0055] Preferably, the wear-resistant part 5 is made of any one or more of the following: reinforced polytetrafluoroethylene (PTFE composite material, suitable for light to medium loads, normal temperature (-200~260℃), and non-corrosive environments); ultra-high molecular weight polyethylene (UHMWPE, self-lubricating, suitable for heavy loads (withstanding 10-20MPa pressure), and low-speed sliding environments); polyoxymethylene (POM, high hardness, wear resistance superior to ordinary plastics, suitable for medium-speed transmission and structural environments requiring high dimensional accuracy); and polyetheretherketone (PEEK composite material, high temperature resistance (long-term operating temperature 260℃), excellent wear resistance (comparable to metal after adding carbon fiber), and strong corrosion resistance. Suitable for high-temperature, high-pressure, and corrosive environments). The above materials have excellent wear resistance and self-lubricating properties, effectively improving the service life of the wear-resistant part 5. It should be emphasized that the above materials are only preferred options; powder metallurgy (iron-based / copper-based), aluminum alloy, ceramic, and other materials can also be used, without special limitations.

[0056] Preferably, a sealing ring 24 is provided between the piston 2 and the wear-resistant part 5 and / or the inner wall of the oil chamber 11 to provide a sealing function.

[0057] Example 2

[0058] The preferred fit between the wear-resistant part 5 and the brake pump body 1 (oil chamber 11) is as follows:

[0059] Reference Figure 3 , Figure 5 The wear-resistant part 5 has a limiting rib 51, and the inner wall of the oil cavity 11 is provided with a limiting step 14. The limiting rib 51 abuts against the limiting step 14, so that a pre-positioning fit is formed between the wear-resistant part 5 and the inner wall of the oil cavity 11. The pre-positioning fit between the limiting rib 51 and the limiting step 14 provides a clear positioning reference for the installation of the wear-resistant part 5 in the oil cavity 11, ensuring that the wear-resistant part 5 is accurately fixed in the wear-prone area 12 and avoiding misalignment of the protective position due to installation offset. In addition, the pre-positioning fit can also reduce the movement of the wear-resistant part 5 during the reciprocating motion of the piston 2. During braking, the piston 2 reciprocates at a high frequency. If the wear-resistant part 5 is not positioned, it may undergo axial displacement due to friction or inertia, which will aggravate local wear. The abutting relationship between the limiting rib 51 and the step can provide axial constraint for the wear-resistant part 5, ensuring that it is always stably attached to the target area.

[0060] Reference Figure 3 , Figure 5The wear-resistant part 5 has a sealing groove 52, and a sealing element 53 is disposed in the sealing groove 52. The sealing element 53 abuts against the inner wall of the oil cavity 11 to form a sealing fit. After the sealing element 53 is tightly abutted against the inner wall of the oil cavity 11, it can fill the gap between the wear-resistant part 5 and the oil cavity 11, preventing brake fluid from leaking from the gap. On the other hand, since the wear-resistant part 5 adopts a detachable design, the combination of the sealing groove 52 and the sealing element 53 can compensate for the gap problem that may exist in the detachable connection.

[0061] Furthermore, referring to Figure 3 , Figure 5 Both the outer wall of the wear-resistant part 5 and the inner wall of the oil cavity 11 are provided with corresponding fixing grooves 15, and a retaining ring 151 is inserted into the fixing groove 15. The retaining ring 151 (also known as a retaining ring) is an elastic ring-shaped metal part. After being installed in the aligned fixing groove 15, its outer ring fits against the fixing groove 15 on the inner wall of the oil cavity 11, and its inner ring engages with the fixing groove 15 on the outer wall of the wear-resistant part 5. The radial force generated by the elastic deformation firmly locks the two together. This fixing method can effectively resist the axial thrust and radial friction generated by the reciprocating motion of the piston 2, and prevent the wear-resistant part 5 from loosening, shifting or even falling off due to long-term stress.

[0062] Example 3

[0063] There are various specific structural designs for the wear-resistant part 5. In this embodiment, the following preferred design is provided:

[0064] I. Reference Figure 3 , Figure 5 The wear-resistant component 5 is a wear-resistant sleeve 6, which has an accommodating inner cavity 61. The power assist rod 3 and piston 2 extend at least partially into the accommodating inner cavity 61, and the contact point between the power assist rod 3 and piston 2 is located within the accommodating inner cavity 61. The wear-resistant sleeve 6 can simultaneously protect the contact area between the power assist rod 3 and piston 2, as well as the easily worn area 12 between piston 2 and the inner wall of the oil chamber 11, further improving the wear resistance of the brake upper pump.

[0065] Because piston 2 and push rod 3 are not coaxial, the contact point (strong side contact area 21) is a "point friction" area where force is concentrated. Long-term reciprocating impact and compression can easily cause wear (such as concavity at the end of piston 2 and deformation at the front end of push rod 3). Wear-resistant sleeve 6 encloses this contact point through the accommodating cavity 61. Its inner wall can directly bear the contact stress between the two, avoiding direct friction between metal parts and reducing wear in the contact area from the source. On the other hand, the accommodating cavity 61 of wear-resistant sleeve 6 can constrain the movement of the push rod 3 and piston 2 through the close fit between its inner wall and the push rod 3. Specifically, the inner cavity sidewall can limit the radial wobble of push rod 3, while guiding piston 2 to slide stably in the coaxial direction, reducing the problem of uneven wear caused by misalignment. This works in conjunction with the design of "piston 2 and oil cavity 11 being coaxially set" to further improve motion accuracy. Furthermore, the wear-resistant sleeve 6 can still be fixed using the aforementioned detachable structures such as the limiting rib 51 and the snap ring 151. When replacing it, you only need to remove the entire wear-resistant sleeve 6 to complete the replacement of all wear-resistant parts 5 in high-wear areas, without having to disassemble multiple parts one by one, which further improves maintenance efficiency.

[0066] II. Reference Figure 6 The wear-resistant component 5 includes a carrier 71 (which serves as the mounting base for the first and second wear-resistant blocks 73, and plays a connecting and positioning role), as well as a first wear-resistant block 72 and a second wear-resistant block 73;

[0067] The first wear-resistant block 72 is installed on the inner side of the carrier 71, and the first wear-resistant block 72 is aligned with the strong side contact area 21. Since the strong side contact area 21 is the main force contact part between the push rod 3 and the piston 2, the force is concentrated and mainly "impact friction" (local squeezing and sliding during reciprocating push). Therefore, the first wear-resistant block 72 needs to have high hardness and impact resistance to directly bear the stress when the two are in contact, and avoid the piston 2 or the end of the push rod 3 from being worn and deformed due to long-term impact.

[0068] The second wear-resistant block 73 is installed on the outside of the carrier 71, and the second wear-resistant block 73 is aligned with the easily worn area 12. The easily worn area 12 is mainly characterized by "sliding friction" (circumferential friction during the reciprocating motion of the piston 2). Therefore, the second wear-resistant block 73 needs to focus on the characteristics of low friction coefficient and wear resistance to reduce the direct friction between the piston 2 and the inner wall of the oil chamber 11, while reducing the motion resistance and ensuring smooth sliding of the piston 2.

[0069] The wear-resistant part 5 with the above structure can provide targeted protection for the strong contact area 21 and the easily worn area 12, thereby improving the efficiency of the wear-resistant part 5.

[0070] It is particularly important to emphasize that the combination of carrier 71, first wear-resistant block 72, and second wear-resistant block 73 results in lower maintenance costs and more flexible replacement. Specifically, since the first and second wear-resistant blocks 73 are independently installed on carrier 71, when a wear-resistant block in a certain area wears out (e.g., the first wear-resistant block 72 in the strong side contact area 21 is prematurely worn out due to impact, while the second wear-resistant block 73 is still usable), the corresponding wear-resistant block can be replaced individually without replacing the entire wear-resistant component 5 (unlike the wear-resistant sleeve 6, which requires overall replacement), further reducing maintenance costs. At the same time, carrier 71 is reusable, consuming only spare wear-resistant blocks, making it suitable for scenarios with uneven wear.

[0071] Furthermore, the carrier 71 is provided with a plurality of receiving grooves 711, and the first wear-resistant block 72 and the second wear-resistant block 73 are respectively assembled into the corresponding receiving grooves 711, with the inner surface of the first wear-resistant block 72 being flush with the inner surface of the carrier 71, and the outer surface of the second wear-resistant block 73 being flush with the outer surface of the carrier 71. This flush design after installation ensures the smooth movement of the piston 2 and avoids obstruction of the piston 2's movement due to the protrusion of the wear-resistant blocks.

[0072] III. Reference Figure 7 The wear-resistant component 5 is a wear-resistant plate 8, located in the easily worn area 12, and mounted on the inner wall of the oil chamber 11 or the outer wall of the piston 2. The wear-resistant component 5, designed specifically for the easily worn area 12, is a simpler and lighter alternative. The wear-resistant plate 8 has a simple structure, is easy to install, and its installation position can be flexibly selected according to actual wear conditions.

[0073] Specifically, the wear-resistant plate 8 only acts on the easily worn area 12 of the piston 2 and the inner wall of the oil chamber 11 (i.e., the sliding friction area on the same side as the strong contact area 21), without covering other parts, making the structure simpler. Compared with the wear-resistant sleeve 6 or the modular wear-resistant part 5, the spare parts cost of the wear-resistant plate 8 is lower, the maintenance operation is easier to learn, and it is suitable for daily quick maintenance.

[0074] Fourth, the wear-resistant component 5 is a wear-resistant coating applied to the outer wall of the piston 2 and / or the inner wall of the oil cavity 11. The wear-resistant coating is thinner and lighter, and after wear, the components can be disassembled and recoated to form a new wear-resistant coating, achieving repeated use and extending service life. The wear-resistant coating can be a hard anodized coating, a water-based polyamide-imide solid lubricant coating, a nickel-based alloy coating, a graphite anti-friction coating, etc.

[0075] 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.

[0076] 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. A brake upper pump with wear resistance and easy maintenance functions, comprising: The brake pump body (1) has an oil chamber (11) inside, and the oil chamber (11) is filled with brake fluid. Piston (2), which is movably disposed within the oil chamber (11); The front end of the push rod (3) extends into the oil chamber (11) and abuts against the piston (2) so that the push rod (3) and the piston (2) form a transmission engagement; The brake handle (4) is rotated with the brake pump body (1) through a pivoting mechanism (41), and the brake handle (4) is connected to the power push rod (3) through a rotary push mechanism (42) to form a transmission connection. The piston (2) and the oil chamber (11) are coaxially arranged along the piston (2), and the piston (2) and the booster rod (3) are not coaxially arranged, so that a strong side contact area (21) and a weak side contact area (22) are formed between the booster rod (3) and the piston (2); a wear-prone area (12) and a non-wear-prone area (13) are formed between the outer wall of the piston (2) and the inner wall of the oil chamber (11), wherein the wear-prone area (12) and the strong side contact area (21) are located on the same side, and the non-wear-prone area (13) and the weak side contact area (22) are located on the same side; Its features are: It also includes a wear-resistant component (5), which is disposed in the wear-prone area (12) between the outer wall of the piston (2) and the inner wall of the oil chamber (11).

2. The brake upper pump with wear resistance and easy maintenance as described in claim 1, characterized in that: The wear-resistant component (5) is detachably connected between the outer wall of the piston (2) and the inner wall of the oil chamber (11).

3. The brake upper pump with wear resistance and easy maintenance functions according to claim 2, characterized in that: The wear-resistant part (5) has a limiting rib (51), and the inner wall of the oil cavity (11) is provided with a limiting step (14). The limiting rib (51) abuts against the limiting step (14) so ​​that a pre-positioning fit is formed between the wear-resistant part (5) and the inner wall of the oil cavity (11). The wear-resistant part (5) is provided with a sealing groove (52), and a sealing element (53) is provided in the sealing groove (52). The sealing element (53) abuts against the inner wall of the oil cavity (11) and forms a sealing fit.

4. The brake upper pump with wear resistance and easy maintenance functions according to claim 1, characterized in that: The outer wall of the wear-resistant part (5) and the inner wall of the oil cavity (11) are provided with corresponding fixing grooves (15), and a retaining ring (151) is connected in the fixing groove (15).

5. The brake upper pump with wear resistance and easy maintenance as described in claim 1, characterized in that: The wear-resistant part (5) is a wear-resistant sleeve (6), which has an inner cavity (61). The push rod (3) and the piston (2) extend at least partially into the inner cavity (61), and the contact point between the push rod (3) and the piston (2) is located in the inner cavity (61).

6. The brake upper pump with wear resistance and easy maintenance as described in claim 1, characterized in that: The wear-resistant component (5) includes a carrier (71), a first wear-resistant block (72), and a second wear-resistant block (73); The first wear-resistant block (72) is installed on the inner side of the carrier (71), and the first wear-resistant block (72) is aligned with the strong side contact area (21); the second wear-resistant block (73) is installed on the outer side of the carrier (71), and the second wear-resistant block (73) is aligned with the easily worn area (12).

7. The brake upper pump with wear resistance and easy maintenance as described in claim 6, characterized in that: The carrier (71) has a plurality of receiving grooves (711), and the first wear-resistant block (72) and the second wear-resistant block (73) are respectively assembled into the corresponding receiving grooves (711). The inner surface of the first wear-resistant block (72) is flush with the inner surface of the carrier (71), and the outer surface of the second wear-resistant block (73) is flush with the outer surface of the carrier (71).

8. The brake upper pump with wear resistance and easy maintenance functions according to claim 1, characterized in that: The wear-resistant part (5) is a wear-resistant plate (8), which is located in the wear-prone area (12) and is installed on the inner wall of the oil cavity (11) or the outer wall of the piston (2).

9. The brake upper pump with wear resistance and easy maintenance function according to any one of claims 1-8, characterized in that: The wear-resistant part (5) is made of any one or more of reinforced polytetrafluoroethylene, ultra-high molecular weight polyethylene, polyoxymethylene, and polyetheretherketone.

10. The brake upper pump with wear resistance and easy maintenance functions according to claim 1, characterized in that: The piston (2) has a hemispherical groove (23) at its rear end, and the front end of the push rod (3) is a ball end (31). The ball end (31) extends into the hemispherical groove (23) and abuts against each other, so that the push rod (3) and the piston (2) form a transmission cooperation.

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