Brake upper pump capable of easily adjusting idle stroke of piston

Abstract

A brake upper pump capable of easily adjusting the idle stroke of a piston comprises a brake pump body which is provided with a piston cavity and an oil storage cavity, and the oil storage cavity is communicated with the piston cavity through an oil supplementing hole; the piston push rod assembly comprises a piston body, a push rod body in contactable connection with the piston body and a piston cylinder sleeve arranged on the piston body in a sleeving mode. The brake handle is in running fit with the brake pump body, and the brake handle is in transmission fit with the piston body through the push rod body; when the brake handle is not operated, the piston body is in an initial position state, at the moment, the piston cylinder sleeve abuts against the piston body to form limiting and retaining fit, and the interval between the piston body and the oil supplementing hole forms an idle stroke; the piston cylinder sleeve is connected into the piston cavity in a displaceable mode, and in the displacement process of the piston cylinder sleeve, the piston cylinder sleeve acts on the piston body and drives the piston body to replace the initial position state so that the length of the idle stroke can be increased or decreased. The device is simple in structure and easy to operate, and has good structural strength, sealing performance and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of brake products, in particular to a brake upper pump which is easy to adjust the idle stroke of a piston. Background Art

[0002] Brakes, a type of braking system, are a crucial component of vehicle safety. The quality of the brakes often affects the rider's life, especially for riders who frequently compete at high speeds. If the brake structure and efficiency are not comprehensive and perfect, even the most skilled riders will not be able to control the bicycle as desired. Especially at high speeds, when both impulse and kinetic energy reach their maximum values, a failure to brake effectively can endanger the rider's own life and the lives of others, potentially leading to large-scale disasters. In vehicles such as bicycles, electric vehicles, and motorcycles, the device used to control the brakes is a brake (commonly known as a brake handle). A brake handle is a handle used when braking, and is used on bicycles, strollers, electric vehicles, and motorcycles. Traditionally, during the installation of brake wire on vehicles such as electric vehicles, bicycles, and tricycles, traditional tools such as wire cutters and wrenches are typically used in conjunction with brute force to tighten the wire. This traditional wire tightening method has many shortcomings and is difficult to operate. For example, wires can easily slip out of wire cutters or wrenches, and adjusting the tension is difficult, which is time-consuming and labor-intensive. To achieve braking efficiency and precision, hydraulic brakes are widely used in vehicles currently on the market (such as cars, motorcycles, and bicycles).

[0003] Brake free travel, also known as free travel, refers to the distance the brake pedal (for automobiles and other motor vehicles) or brake handle (for motorcycles and bicycles) moves from its initial position until the braking effect begins. Simply put, it's the distance the vehicle's brakes travel before they actually apply force, during the initial application of the brake pedal or handle. A certain amount of free travel is necessary to prevent oversensitivity in the braking system. A reasonable amount of free travel ensures a comfortable operating range for the driver.

[0004] As an example of the prior art, refer to patent document CN114633837B, which discloses a hydraulic operating device including a base member, an operating member, a piston and a stroke changing structure. The base member includes a cylinder bore, a first hose attachment hole configured to be in fluid communication with the cylinder bore, and a second hose attachment hole configured to be in fluid communication with the cylinder bore. The operating member is movably connected to the base member. The piston is movably arranged in the cylinder bore and is operatively connected to the operating member to move relative to the base member in response to the movement of the operating member. The stroke changing structure is configured to change the ratio of the amount of movement of the piston to the amount of movement of the operating member. In the technical example, in order to enable adjustment of the initial position of the piston (idle stroke or free stroke), it is necessary to provide a separate adjusting screw (operating member) and a base member. This structural solution has at least the following defects: 1. The large number of parts makes the production and assembly processes more complicated; 2. The original cavity structure needs to be destroyed (to form various attachment holes), which will greatly destroy the structural balance of the original brake cylinder body, resulting in a decrease in structural strength, sealing and other performance; 3. The shapes of the adjusting screw (operating component) and the base component are protruding, and they are more easily damaged in a fall; 4. The matching accuracy requirements between multiple components are high, and after long-term use, they are prone to looseness, jamming and other problems, resulting in abnormal use. Summary of the Invention

[0005] In order to overcome the above-mentioned deficiencies in the prior art, the utility model provides a brake upper pump which is easy to adjust the idle stroke of the piston.

[0006] The utility model solves the technical problem with a technical solution of: a brake upper pump that is easy to adjust the piston idle stroke, comprising:

[0007] The brake pump body is provided with a piston chamber and an oil storage chamber, wherein the piston chamber and the oil storage chamber are filled with brake oil, and the oil storage chamber is connected with the piston chamber through an oil filling hole;

[0008] The piston push rod assembly includes a piston body, a push rod body and a piston cylinder sleeve. The piston body is located in the piston cavity. The piston cylinder sleeve is sleeved on the piston body and is at least partially located in the piston cavity. The front end of the push rod body extends into the piston cylinder sleeve and forms a contact connection with the piston body.

[0009] A brake handle, which forms a rotational fit with the brake pump body through a pivot mechanism, and the brake handle forms a transmission fit with the piston body through a push rod body;

[0010] an oil pipe assembly connected to the brake cylinder body and communicating with the piston chamber;

[0011] When the brake handle is not operated, the piston body is in the initial position. At this time, the piston sleeve and the piston body abut against each other and form a limit stop fit, and the distance between the piston body and the oil filling hole forms an idle stroke.

[0012] The piston-cylinder sleeve is displaceably connected in the piston cavity. During the displacement of the piston-cylinder sleeve, the piston-cylinder sleeve acts on the piston body and drives the piston body to change its initial position state to increase or decrease the length of the idle stroke.

[0013] In an optional embodiment, an internal thread section is provided on the inner wall of the piston cavity, and an external thread section is provided on the outer wall of the piston cylinder sleeve, and the internal thread section and the external thread section form a threaded connection;

[0014] The thread matching lengths of the internal thread section and the external thread section are adjusted so that the piston cylinder sleeve can be displaced relative to the piston chamber.

[0015] In another optional embodiment, a plurality of positioning grooves are provided on the inner wall of the piston cavity, and the positioning grooves are distributed along the movement direction of the piston body. Positioning ribs are provided on the outer wall of the piston cylinder sleeve, and the positioning ribs can be inserted into any one of the positioning grooves to enable the piston cylinder sleeve to be shifted relative to the piston cavity.

[0016] In some embodiments of the present invention, the piston body has a circle of support ring, and the support ring can be against the front end surface of the piston cylinder sleeve, so that the piston cylinder sleeve and the piston body form a limited and anti-retraction fit.

[0017] In some embodiments of the present invention, the piston body is further provided with a plurality of large-diameter sealing rings, which are located behind the support ring and abut against the inner wall of the piston cavity to form a sealing fit.

[0018] In some embodiments of the present invention, the piston body is provided with a piston oil seal, which is arranged at the front end of the support ring and abuts against the inner wall of the piston cavity to form a sealing fit.

[0019] In some embodiments of the present invention, the piston cylinder sleeve has a through hole, and the piston body and the push rod body extend into the through hole respectively;

[0020] A limiting portion is formed on the inner wall of the through hole, and the push rod body has a large diameter section and a small diameter section. The limiting portion forms a clearance fit with the small diameter section, and the limiting portion can abut against the large diameter section to form a limiting and stop fit;

[0021] A limiting hole is provided on the brake pump body, the limiting hole is connected to the piston cavity, a limiting groove is provided on the outer wall of the piston cylinder sleeve, a limiting element is connected to the limiting hole, and the limiting element at least partially extends into the piston cavity and is located in the limiting groove.

[0022] Furthermore, a plurality of small-diameter sealing rings are sleeved on the piston body. The small-diameter sealing rings are located in the through hole, and the small-diameter sealing rings abut against the inner wall of the through hole to form a sealing fit.

[0023] Preferably, a driving portion for user operation is formed at the rear end of the piston cylinder sleeve, and the driving portion is located outside the piston cavity.

[0024] More specifically, the driving portion has a plurality of groove sections and convex sections, and the groove sections and the convex sections are arranged at intervals along the circumferential direction.

[0025] The beneficial effects of the present invention are:

[0026] 1. The number of parts is small. The idle stroke adjustment function can be achieved by simple structural adjustment of the parts (piston chamber and piston cylinder sleeve) without adding additional parts (operating components and base components). Therefore, the production process and assembly process are relatively simple.

[0027] Second, there is almost no need to destroy the original cavity structure or brake pump body structure, so the structural balance of the original brake pump body can be maintained, and it has good structural strength, sealing and other properties.

[0028] 3. The structure of the piston and cylinder sleeve can be installed semi-hiddenly and does not protrude from the surface of the brake cylinder body. Therefore, in the event of an accident such as a fall, the related structure of the idle stroke adjustment is not easily damaged.

[0029] 4. The structure is simple enough, with low requirements for assembly precision, and it is stable and reliable enough for long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is an assembly diagram of the utility model.

[0031] Figure 2 It is an exploded view of the present utility model.

[0032] Figure 3 It is a structural sectional view of the utility model (threaded fit) when it has a small idle stroke.

[0033] Figure 4 yes Figure 3 A magnified schematic diagram of the local structure of part A.

[0034] Figure 5It is a structural sectional view of the utility model (threaded fit) when it has a medium idle stroke.

[0035] Figure 6 yes Figure 5 A magnified schematic diagram of the local structure of part B.

[0036] Figure 7 It is a structural sectional view of the utility model (threaded fit) when it has a large idle stroke.

[0037] Figure 8 yes Figure 7 A magnified schematic diagram of the local structure of part C.

[0038] Figure 9 It is a structural cross-sectional view of the cooperation between the positioning rib and the positioning groove in the second embodiment.

[0039] Figure 10 yes Figure 9 A magnified schematic diagram of the local structure of part D.

[0040] Figure 11 It is a structural schematic diagram of the piston cylinder sleeve (with an external thread structure) in the utility model.

[0041] Figure 12 It is a cross-sectional view of the utility model and an enlarged schematic diagram of the local structure of its limiting element.

[0042] In the figure: 1. Brake cylinder body; 11. Piston chamber; 111. Internal thread section; 112. Positioning groove; 12. Oil storage chamber; 13. Oil filling hole; 14. Limiting hole; 2. Piston push rod assembly; 21. Piston body; 211. Support ring; 212. Ball head groove; 22. Push rod body; 221. Large diameter section; 222. Small diameter section; 23. Piston cylinder sleeve; 231. Through hole; 2311. Limiting part; 232. Driving part; 2321. Groove section; 2322. Protruding section; 233. External thread section; 234. Positioning rib; 235. Limiting groove; L, idle stroke; 3. Brake handle; 31. Pivoting mechanism; 4. Oil pipe assembly; 51. Large diameter sealing ring; 52. Piston oil seal; 53. Small diameter sealing ring; 6. Return spring; 7. Limiting element. DETAILED DESCRIPTION

[0043] 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 a specific description of the present invention, and their purpose is to allow those skilled in the art to better understand the technical solution of the present invention, and should not be regarded as limiting the present invention.

[0044] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", and "outside" are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0045] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0046] Example 1

[0047] Reference Figures 1 to 11 , a brake pump with easy adjustment of piston idle stroke, comprising: a brake pump body 1, which is provided with a piston chamber 11 and an oil storage chamber 12, the piston chamber 11 and the oil storage chamber 12 are filled with brake oil, and the oil storage chamber 12 is connected with the piston chamber 11 through an oil filling hole 13; a piston push rod assembly 2, comprising a piston body 21, a push rod body 22 and a piston cylinder sleeve 23, the piston body 21 is located in the piston chamber 11, the piston cylinder sleeve 23 is sleeved on the piston body 21 and is at least partially located in the piston chamber 11, the front end of the push rod body 22 extends into the piston cylinder sleeve 23 and forms a contactable connection with the piston body 21; a brake handle 3, which is rotated with the brake pump body 1 through a pivot mechanism 31, and the brake handle 3 is transmitted with the piston body 21 through the push rod body 22; an oil pipe assembly 4, which is connected to the brake pump body 1 and is communicated with the piston chamber 11.

[0048] When the brake handle 3 is not operated, the piston body 21 is in the initial position. At this time, the piston cylinder sleeve 23 and the piston body 21 are in contact with each other and form a limit stop fit, and the distance between the piston body 21 and the oil replenishing hole 13 forms an idle stroke L. When the piston body 21 moves in the idle stroke L, the brake oil in the oil storage chamber 12 of the brake handle 3 can enter the piston chamber 11 through the oil replenishing hole 13, so the braking effect is not effective; after the movable body passes through the oil replenishing hole 13, the brake oil in the oil storage chamber 12 of the brake handle 3 can no longer enter the piston chamber 11 through the oil replenishing hole 13, so a relatively sealed space is formed between the brake upper pump (piston chamber 11) and the brake lower pump, and no new brake oil enters. If the brake handle 3 is squeezed again, the braking effect will take effect.

[0049] Unlike conventional brake handles 3, the present invention includes a piston sleeve 23. This invention incorporates a completely new design and optimization of the structure of the piston sleeve 23 and the piston chamber 11 to achieve adjustment of the idle stroke L of the piston push rod assembly 2. Specifically, the piston sleeve 23 is displaceably connected to the piston chamber 11. During displacement, the piston sleeve 23 acts on the piston body 21 and forces the piston body 21 to change its initial position, thereby increasing or decreasing the length of the idle stroke L.

[0050] The above content is the basic structural scheme of the present invention, which has at least the following advantages: First, the number of parts is small, and the idle stroke L adjustment function can be realized by simple structural adjustment of the parts (piston chamber 11 and piston cylinder sleeve 23) without adding additional parts (operating components and base components), so the production process and assembly process are relatively simple; second, there is almost no need to destroy the original cavity structure or the brake pump body 1 structure, so the structural balance of the original brake pump body 1 can be maintained, and it has good structural strength, sealing and other properties; third, the structure of the piston cylinder sleeve 23 can be semi-hidden installed and does not protrude from the surface of the brake pump body 1, so in the event of an accident such as a fall, the related structure of the idle stroke L adjustment is not easily damaged; fourth, the structure is simple enough, with low requirements for assembly precision, and is sufficiently stable and reliable when used for a long time.

[0051] It should be noted that after the piston sleeve 23 is adjusted, it maintains a stable position relative to the piston chamber 11. The piston body 21 has a support ring 211 that abuts against the front end of the piston sleeve 23, ensuring that the piston sleeve 23 and the piston body 21 form a position-limiting, stop-and-retract fit, corresponding to the initial position of the piston body 21.

[0052] In order to realize the installation and interaction of the piston cylinder sleeve 23, the piston body 21 and the push rod body 22, the preferred structure adopted is: Figure 11The piston cylinder sleeve 23 has a through hole 231, and the piston body 21 and the push rod body 22 extend into the through hole 231 respectively. A limiting portion 2311 is formed on the inner wall of the through hole 231. The push rod body 22 has a large diameter section 221 and a small diameter section 222. The limiting portion 2311 forms a clearance fit with the small diameter section 222, and the limiting portion 2311 can abut against the large diameter section 221 to form a limited and stop fit. It should be noted that when the push rod body 22 is installed, the push rod body 22 is installed into the through hole 231 from front to back, so that the small diameter section 222 can smoothly pass through the limiting portion 2311, and the large diameter section 221 is limited by the limiting portion 2311. Then, the piston body 21 is installed into the through hole 231.

[0053] After the piston push rod assembly 2 is assembled into the piston cavity 11, in order to prevent the piston cylinder sleeve 23 and other parts from loosening and separating the piston cavity 11, a limiting structure needs to be set for it, preferably as follows: Figure 12 The brake cylinder body 1 is provided with a limiting hole 14, which is in communication with the piston cavity 11. A limiting groove 235 is provided on the outer wall of the piston cylinder sleeve 23. The limiting hole 14 is connected to the limiting element 7, which at least partially extends into the piston cavity 11 and is located in the limiting groove 235. If the piston cylinder sleeve 23 retreats, it can offset the limiting element 7, that is, the limiting element 7 has an effective limiting and stopping effect on the piston cylinder sleeve 23. It should be noted that the length of the limiting groove 235 is not less than the adjustable length of the idle stroke L to meet the adjustment requirements of the idle stroke L; on the other hand, the limiting element 7 is preferably a fastener such as a screw.

[0054] More preferably, the large diameter section 221 is in the shape of a ball head, and the rear end of the piston body 21 has a ball head groove 212, and the large diameter section 221 extends into the ball head groove 212. The two can offset and interact with each other, so that the brake handle 3 realizes transmission cooperation with the piston body 21 through the push rod body 22.

[0055] Another preferred structure of the piston cylinder sleeve 23 is: Figure 11 The rear end of the piston-cylinder sleeve 23 is formed with a user-operated driving portion 232, which is located outside the piston cavity 11. More specifically, the driving portion 232 has multiple groove sections 2321 and raised sections 2322, which are arranged at intervals along the circumference. This makes it easier for the user to operate the piston-cylinder sleeve 23 through the driving portion 232 to achieve displacement of the piston-cylinder sleeve 23.

[0056] Preferably, a return spring 6 is provided between the inner wall of the piston cavity 11 and the front end of the piston body 21. Under the action of the return spring 6 and / or the internal pressure of the cavity (provided by the brake oil), the piston body 21 always has a tendency to move backward and return to its initial position.

[0057] Example 2

[0058] Based on the structure of the first embodiment, there are various ways to displaceably connect the piston cylinder sleeve 23 and the piston chamber 11. This embodiment provides two preferred solutions, as follows:

[0059] 1. Reference Figures 3 to 8 The inner wall of the piston chamber 11 is provided with an internal threaded section 111, and the outer wall of the piston cylinder sleeve 23 is provided with an external threaded section 233. The internal threaded section 111 and the external threaded section 233 form a threaded connection. The threaded engagement length between the internal threaded section 111 and the external threaded section 233 is adjusted to enable displacement of the piston cylinder sleeve 23 relative to the piston chamber 11. Specifically, a greater threaded engagement length results in a smaller idle stroke length L; a smaller threaded engagement length results in a larger idle stroke length L.

[0060] 2. Reference Figures 9 and 10 The inner wall of the piston cavity 11 is provided with a plurality of positioning grooves 112, which are distributed along the movement direction of the piston body 21. The outer wall of the piston cylinder sleeve 23 is provided with positioning ribs 234, which can be snapped into any one of the positioning grooves 112 to enable the piston cylinder sleeve 23 to be displaced relative to the piston cavity 11. Preferably, the positioning ribs 234 and / or the positioning grooves 112 have a certain elastic deformation capacity to better achieve displacement.

[0061] Example 3

[0062] This embodiment provides a preferred sealing structure solution, refer to Figures 2 to 10 , as follows:

[0063] 1. The piston body 21 is also provided with a plurality of large-diameter sealing rings 51 . The large-diameter sealing rings 51 are located behind the support ring 211 , and the large-diameter sealing rings 51 abut against the inner wall of the piston cavity 11 to form a sealing fit.

[0064] Second, the piston body 21 is fitted with a piston oil seal 52, located at the front end of the support ring 211. It abuts the inner wall of the piston cavity 11, forming a tight seal. Therefore, the idle stroke L is more specifically the distance between the piston oil seal 52 and the oil fill hole 13 on the piston body 21. Furthermore, the presence of the piston oil seal 52 reduces friction and wear and prevents fluid (brake fluid) leakage, allowing the fluid to be pushed toward the brake pump when the brake is applied.

[0065] 3. The piston body 21 is sleeved with a plurality of small-diameter sealing rings 53 . The small-diameter sealing rings 53 are located in the through-hole 231 , and the small-diameter sealing rings 53 abut against the inner wall of the through-hole 231 to form a sealing fit.

[0066] It is worth noting that other technical solutions of the present invention belong to the existing technology and are therefore not described in detail.

[0067] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the concept of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A brake pump with easily adjustable piston idle stroke, comprising: A brake pump body (1) is provided with a piston chamber (11) and an oil storage chamber (12), wherein the piston chamber (11) and the oil storage chamber (12) are filled with brake oil, and the oil storage chamber (12) is connected to the piston chamber (11) through an oil filling hole (13); A piston push rod assembly (2) includes a piston body (21), a push rod body (22) and a piston cylinder sleeve (23), wherein the piston body (21) is located in the piston cavity (11), the piston cylinder sleeve (23) is sleeved on the piston body (21) and is at least partially located in the piston cavity (11), and the front end of the push rod body (22) extends into the piston cylinder sleeve (23) and forms a contact connection with the piston body (21); A brake handle (3) is formed in rotational cooperation with the brake pump body (1) through a pivot mechanism (31), and the brake handle (3) is formed in transmission cooperation with the piston body (21) through a push rod body (22); An oil pipe assembly (4) connected to the brake cylinder body (1) and communicating with the piston chamber (11); Its characteristics are: When the brake handle (3) is not operated, the piston body (21) is in an initial position, at which time the piston cylinder sleeve (23) and the piston body (21) abut against each other and form a limit stop fit, and the distance between the piston body (21) and the oil supply hole (13) forms an idle stroke (L); The piston cylinder sleeve (23) is displaceably connected to the piston chamber (11). During the displacement of the piston cylinder sleeve (23), the piston cylinder sleeve (23) acts on the piston body (21) and drives the piston body (21) to change its initial position state to increase or decrease the length of the idle stroke (L).

2. The brake pump with easily adjustable piston idle stroke according to claim 1, characterized in that: An internal thread section (111) is provided on the inner wall of the piston chamber (11), and an external thread section (233) is provided on the outer wall of the piston cylinder sleeve (23), wherein the internal thread section (111) and the external thread section (233) form a threaded connection; The thread matching lengths of the internal thread section (111) and the external thread section (233) are adjusted so that the piston cylinder sleeve (23) can be displaced relative to the piston chamber (11).

3. The brake pump with easily adjustable piston idle stroke according to claim 1, characterized in that: A plurality of positioning grooves (112) are provided on the inner wall of the piston cavity (11), and the positioning grooves (112) are distributed along the movement direction of the piston body (21). A positioning rib (234) is provided on the outer wall of the piston cylinder sleeve (23), and the positioning rib (234) can be inserted into any one of the positioning grooves (112) to enable the piston cylinder sleeve (23) to be displaced relative to the piston cavity (11).

4. The brake pump with easily adjustable piston idle stroke according to claim 1, characterized in that: The piston body (21) has a circle of support rings (211), and the support rings (211) can abut against the front end surface of the piston cylinder sleeve (23), so that the piston cylinder sleeve (23) and the piston body (21) form a limited and stop fit.

5. The brake pump with easily adjustable piston idle stroke according to claim 4, characterized in that: The piston body (21) is also provided with a plurality of large-diameter sealing rings (51). The large-diameter sealing rings (51) are located behind the support ring (211), and the large-diameter sealing rings (51) abut against the inner wall of the piston cavity (11) to form a sealing fit.

6. The brake pump with easily adjustable piston idle stroke according to claim 4, characterized in that: The piston body (21) is sleeved with a piston oil seal (52), which is arranged at the front end of the support ring (211), and the piston oil seal (52) abuts against the inner wall of the piston cavity (11) to form a sealing fit.

7. The brake pump with easily adjustable piston idle stroke according to claim 1, characterized in that: The piston cylinder sleeve (23) has a through hole (231), and the piston body (21) and the push rod body (22) respectively extend into the through hole (231); A limiting portion (2311) is formed on the inner wall of the through hole (231), and the push rod body (22) has a large diameter section (221) and a small diameter section (222). The limiting portion (2311) forms a clearance fit with the small diameter section (222), and the limiting portion (2311) can abut against the large diameter section (221) to form a limiting and stop fit. A limiting hole (14) is provided on the brake pump body (1), the limiting hole (14) is communicated with the piston cavity (11), a limiting groove (235) is provided on the outer wall of the piston cylinder sleeve (23), a limiting element (7) is connected to the limiting hole (14), and the limiting element (7) at least partially extends into the piston cavity (11) and is located in the limiting groove (235).

8. The brake pump with easily adjustable piston idle stroke according to claim 7, characterized in that: The piston body (21) is sleeved with a plurality of small-diameter sealing rings (53), which are located in the through hole (231), and the small-diameter sealing rings (53) abut against the inner wall of the through hole (231) to form a sealing fit.

9. The brake pump with easily adjustable piston idle stroke according to claim 1, characterized in that: A driving portion (232) for user operation is formed at the rear end of the piston cylinder sleeve (23), and the driving portion (232) is located outside the piston cavity (11).

10. The brake pump with easily adjustable piston idle stroke according to claim 9, characterized in that: The driving portion (232) is provided with a plurality of groove sections (2321) and convex sections (2322), and the groove sections (2321) and the convex sections (2322) are arranged at intervals along the circumferential direction.

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