Brake upper pump with precompression

Abstract

A brake upper pump with pre-pressure comprises a brake pump body which is provided with a piston cavity and an oil storage cavity. The piston push rod assembly is located in the piston cavity; the brake handle is movably arranged on the brake pump body; one end of the oil pipe assembly is communicated with the piston cavity, and the other end is communicated with the brake lower pump; one side of the brake pump body is communicated with the oil storage cavity, and the other side of the brake pump body is provided with a mounting opening; and the pre-pressing mechanism extends into the pre-pressing cavity through the mounting opening, and the pre-pressing mechanism enables the brake oil to always have the movement trend of flowing towards the brake lower pump. The pre-pressing cavity is additionally arranged, the pre-pressing mechanism is arranged, the pre-pressing mechanism pushes brake oil, oil pressure in an oil way is improved, certain pre-pressure is given to the brake pad (the piston push rod assembly) all the time, and therefore negative effects caused by abrasion of the brake pad and loss of the brake oil can be partially counteracted, the loose texture is balanced, and the service life of the brake pad is prolonged. And the hand feeling of the initial section of the handle is softer and more comfortable.

Description

Technical Field

[0001] The utility model relates to the technical field of brake equipment, in particular to a brake upper pump with pre-pressure. Background Art

[0002] Braking is a crucial component of vehicle safety. The quality of braking 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. This is especially true at high speeds, where both impulse and kinetic energy are at their peak. Failure to brake effectively can endanger the rider's own life and the lives of others, potentially leading to large-scale disasters.

[0003] Traditionally, during the installation of brake wires for vehicles such as electric vehicles, bicycles, and tricycles, traditional tools such as wire cutters and wrenches are generally used in conjunction with brute force to tighten the wires. This traditional wire tightening method has many shortcomings and is difficult to operate. For example, the wire can easily slip out of the wire cutters or wrenches, and it is not easy to adjust the tightness, which is particularly time-consuming and labor-intensive. In pursuit of braking efficiency and precision, hydraulic brakes are currently widely used in vehicles on the market (such as cars, motorcycles, and bicycles). The principle is to connect one end of a brake oil pipe to the output end of the internal oil circuit of a brake handle seat, and the other end of the brake oil pipe is connected to a disc brake. The handle can be pressed to push a piston rod in the internal oil circuit, so that the pressure in the oil circuit acts on the disc brake through the brake oil pipe, thereby forming a disc brake operation, also known as a hydraulic brake.

[0004] Prior art example 1, referring to patent document CN221665161U, discloses an oil seal anti-scratch structure for a brake upper pump, comprising a brake pump body, a brake handle, and a piston push rod assembly; the brake pump body is provided with a pressure cylinder and an oil storage cylinder, the oil storage cylinder is connected to the pressure cylinder through an oil delivery hole, and the piston push rod assembly at least partially extends into the pressure cylinder; the pressure cylinder is divided into a front cylinder body section and a rear cylinder body section, and a transition section is formed between the front cylinder body section and the rear cylinder body section; the oil delivery hole is provided on the transition section, and the radial dimension of the transition section is greater than the radial dimension of the front cylinder body section; the piston push rod assembly is provided with a first support portion and a second support portion from back to front, and a piston oil seal is provided between the first support portion and the second support portion. Prior art example 2, referring to patent document CN221723289U, discloses a brake pump for reducing the cost of brake pad replacement, comprising a pump body, which is provided with a mounting hole; a piston assembly; a brake pad assembly, which is detachably arranged in a hollow chamber, and an accommodating gap is formed between the brake pad assembly and the piston assembly; a heat sink, which is molded separately from the brake pad assembly; a reset spring, which acts on the brake pad assembly so that the brake pad assembly always has a movement tendency to move outward; the heat sink comprises a heat conducting part and a heat dissipating part, the heat conducting part is located in the hollow chamber, the heat dissipating part extends outside the pump body, and a first connecting hole is provided on the heat conducting part; the brake pad assembly is abutted against the heat conducting part, and a second connecting hole is provided on the brake pad assembly; the first connecting hole, the second connecting hole and the mounting hole are arranged in the same direction, and the heat sink, the brake pad assembly and the pump body are assembled together by the same connecting pin.

[0005] As can be seen from the solutions of Examples 1 and 2, the upper brake pump is connected to the lower brake pump via an oil pipe, forming a hydraulic oil circuit between the two for the flow of internal brake fluid. Specifically, when the user applies the brake, the brake fluid in the upper brake pump flows into the lower brake pump, thereby pushing out the brake pads in the lower brake pump, which in turn clamps the brake disc, achieving effective braking. However, as is well known, brake pads wear during use, resulting in a higher amount of oil push (i.e., greater piston movement) required to achieve the same braking effect. Furthermore, during use, brake fluid inevitably loses some amount of fluid, which results in more gaps in the oil circuit, resulting in a loose feel during use and unstable brake pad boosting effect. Furthermore, once the brake fluid is lost, the user can only fix it by refilling the internal brake fluid, which is very cumbersome. Furthermore, in the existing structure, the pressure in the oil circuit is low when not braking, so it cannot provide sufficient preload on the brake pads (piston push rod assembly), resulting in a more noticeable "slamming against the wall" feeling when the user initially squeezes the handle. Summary of the Invention

[0006] In order to overcome the above-mentioned shortcomings of the prior art, the present invention provides a brake pump with pre-pressure

[0007] The technical solution of the utility model to solve the technical problem is: a brake pump with pre-pressure, comprising:

[0008] The brake pump body is provided with a piston chamber and an oil storage chamber, and the oil storage chamber is connected to the piston chamber through an oil filling hole;

[0009] a piston push rod assembly, which is located in the piston cavity;

[0010] A brake handle is movably mounted on the brake pump body and is in transmission connection with the piston push rod assembly;

[0011] An oil pipe assembly, one end of which is connected to the piston chamber and the other end of which is connected to the brake pump;

[0012] The brake pump body is further provided with a pre-compression chamber, and the piston chamber, the oil storage chamber and the pre-compression chamber are filled with brake oil. One side of the pre-compression chamber is connected to the oil storage chamber, and the other side has a mounting opening;

[0013] It also includes a pre-compression mechanism, which extends into the pre-compression chamber through the installation opening, and acts on the brake oil in the pre-compression chamber so that the brake oil always has a movement tendency to flow toward the brake lower pump.

[0014] Regarding the preferred embodiment of the pre-pressing mechanism in the present invention, the pre-pressing mechanism includes a floating plug assembly, a limiting sleeve and a sealing member;

[0015] The limiting sleeve is detachably connected to the mounting opening via the first thread structure;

[0016] The limiting sleeve has a through hole, and the floating plug assembly extends into the pre-compression cavity after passing through the through hole, and the floating plug assembly can extend forward or retract backward in the pre-compression cavity;

[0017] The sealing element is arranged between the floating plug assembly and the inner wall of the pre-compression cavity.

[0018] Regarding the specific structural embodiment of the floating plug assembly, the floating plug assembly includes an adjustment operating element, a pre-pressed plug body, and a limiting element;

[0019] The adjusting operating element is provided with a limiting groove, and the limiting element is at least partially disposed in the limiting groove;

[0020] The limiting element abuts against the front end of the limiting sleeve to form a limiting fit, and the adjusting operating element abuts against the rear end of the limiting sleeve to form a limiting fit, so that the adjusting operating element can achieve self-rotation relative to the limiting sleeve;

[0021] The pre-pressed plug body is connected to the adjustment operating element via a second threaded structure.

[0022] Optionally, a sealing groove is provided on the pre-compression plug body, the sealing member is embedded in the sealing groove, and the sealing member abuts against the inner wall of the pre-compression cavity to form a sealing fit.

[0023] A preferred embodiment of the adjustment operating element is that the adjustment operating element includes an operating section, a limiting section and an adjustment section;

[0024] The operating section is located outside the brake pump body;

[0025] The limiting section is located in the through hole of the limiting sleeve, the front end of the limiting section forms a limiting fit with the front end of the limiting sleeve through the limiting element, and the front end of the limiting section forms a limiting fit with the rear end of the limiting sleeve through the first step structure;

[0026] The regulating section extends into the pre-pressing cavity and is connected to the pre-pressing plug body.

[0027] Optionally, the pre-pressing plug body has an adjustment hole, and the adjustment section at least partially extends into the adjustment hole;

[0028] The second thread structure includes an internal thread provided on the adjustment hole and an external thread provided on the adjustment section, wherein the internal thread and the external thread engage with each other;

[0029] When the user rotates the adjustment operating element, the adjustment operating element rotates under the action of the limit section and the limit sleeve, and the number of threaded matching turns between the preload plug body and the adjustment section changes, so that the preload plug body moves forward or backward in the preload chamber.

[0030] Optionally, the front end portion of the limiting sleeve extends forward to form a stop portion, and the stop portion can abut against the pre-pressing plug body to form a limiting and anti-retraction fit.

[0031] In some preferred embodiments of the present invention, one or more clearance grooves are provided on the limiting section.

[0032] More preferably, the limiting sleeve is provided with an elastic pre-tightening component, and the elastic pre-tightening component can be snapped into any one of the gap grooves.

[0033] More specifically, the elastic preload assembly includes a preload screw, a first preload spring, and a preload ball;

[0034] Wherein, a pre-tightening hole is opened on the limiting sleeve, and the pre-tightening screw is threadedly connected in the pre-tightening hole;

[0035] A portion of the pre-tightening ball is located in the pre-tightening hole, and another portion extends out of the pre-tightening hole and can be inserted into the gap groove;

[0036] The first pre-tightening spring is located in the pre-tightening hole, and the first pre-tightening spring abuts between the pre-tightening screw and the pre-tightening top ball.

[0037] In the present invention, a second preload spring is provided between the preload mechanism and the inner wall of the preload cavity.

[0038] The assembly sequence of the preloading mechanism in the present invention is as follows: first, the sealing member is installed on the preloading plug body, then the limiting sleeve is inserted into the adjusting operating element, and the limiting element is installed on the adjusting operating element, and then the adjusting operating element and the preloading plug body are connected and combined through the second threaded structure, and then the adjusting operating element and the preloading plug body are sent into the preloading cavity together, and then the limiting sleeve is connected and fixed to the mounting opening through the first threaded structure, and finally the adjusting operating element is manipulated to change the position of the preloading plug body in the preloading cavity.

[0039] The beneficial effects of the present invention are:

[0040] 1. The cavity structure within the brake pump body has been optimized. A pre-compression chamber has been added to the original piston chamber and oil reservoir chamber, creating a three-chamber structure within the brake pump body and forming an interconnected oil circuit within the upper brake pump. The pre-compression mechanism then pushes the brake fluid, increasing the oil pressure in the oil circuit. This ensures that the brake fluid in the upper brake pump (pre-compression chamber, oil reservoir chamber, and piston chamber) always has a tendency to flow toward the lower brake pump. This consistently applies a certain amount of pre-compression to the brake pads (piston push rod assembly), partially offsetting the negative effects of brake pad wear and brake fluid loss and balancing the loose feel. Furthermore, with the aid of pre-compression, the initial feel of the handle is softer and more comfortable, eliminating the sensation of hitting a wall.

[0041] 2. After disassembling the pre-compression mechanism, the brake oil can be added to the interior of the brake cylinder body through the pre-compression chamber.

[0042] 3. Under the working conditions of the same reserve of brake oil, the greater the distance the preload mechanism extends forward in the preload chamber, the greater the preload applied to the brake pad (piston push rod assembly).

[0043] 4. Manipulate and adjust the operating elements to change the position of the preload plug body in the preload chamber until the user finds the most suitable state for himself. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a structural diagram of the present utility model.

[0045] Figure 2It is a partial structural explosion diagram of the utility model.

[0046] Figure 3 It is a cross-sectional view of the present invention (when the floating plug assembly is retracted backward).

[0047] Figure 4 yes Figure 3 Enlarged schematic diagram of part A.

[0048] Figure 5 It is a cross-sectional view of the present invention (when the floating plug assembly is extended forward).

[0049] Figure 6 yes Figure 5 Schematic diagram of the enlarged portion B.

[0050] Figure 7 It is an assembly diagram of the preloading mechanism.

[0051] Figure 8 This is a schematic diagram of the disassembly of the preloading mechanism.

[0052] Figure 9 It is a structural diagram of the adjustment operating components.

[0053] Figure 10 It is a schematic diagram of the coordination between the adjustment operating element and the elastic preload component.

[0054] Figure 11 It is a structural diagram of the pre-pressed plug body.

[0055] Figure 12 It is a structural diagram of the limit sleeve.

[0056] In the figure: 1, brake pump body; 11, piston chamber; 112, oil filling hole; 12, oil storage chamber; 13, pre-compression chamber; 131, installation opening; 2, piston push rod assembly; 3, brake handle; 4, oil pipe assembly; 5, pre-compression mechanism; 51, floating plug assembly; 511, adjustment operating element; 511a, operation section; 511b, limit section; 511c, adjustment section; 5111, limit groove; 5112, clearance groove; 512, pre-compression plug body; 5121, sealing Sealing groove; 5122, adjustment hole; 513, limiting element; 52, limiting sleeve; 521, front end portion of the limiting sleeve; 522, rear end portion of the limiting sleeve; 523, through hole; 524, stop portion; 525, pre-tightening hole; 53, sealing member; 61, first threaded structure; 62, second threaded structure; 63, first step structure; 64, second step structure; 7, elastic pre-tightening assembly; 71, pre-tightening screw; 72, first pre-tightening spring; 73, pre-tightening top bead; 8, second pre-tightening spring. DETAILED DESCRIPTION

[0057] 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.

[0058] 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.

[0059] 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.

[0060] Example 1

[0061] Reference Figures 1 to 12 A brake upper pump with pre-pressure includes: a brake pump body 1, which is provided with a piston chamber 11 and an oil storage chamber 12, and the oil storage chamber 12 is connected with the piston chamber 11 through an oil replenishing hole 112; a piston push rod assembly 2, which is located in the piston chamber 11; a brake handle 3, which is movably arranged on the brake pump body 1, and the brake handle 3 forms a transmission connection with the piston push rod assembly 2; an oil pipe assembly 4 (consistent with the prior art, so only a part is shown in the figure), one end of which is connected with the piston chamber 11, and the other end is connected with the brake lower pump.

[0062] It is worth mentioning that the present disclosure is different in that a pre-compression chamber 13 is also provided in the brake pump body 1, and the piston chamber 11, the oil storage chamber 12 and the pre-compression chamber 13 are filled with brake oil. One side of the pre-compression chamber 13 is connected to the oil storage chamber 12, and the other side has an installation opening 131; it also includes a pre-compression mechanism 5, and the pre-compression mechanism 5 extends into the pre-compression chamber 13 through the installation opening 131, and the pre-compression mechanism 5 acts on the brake oil in the pre-compression chamber 13, so that the brake oil always has a movement tendency to flow toward the brake lower pump.

[0063] The above-described content is the basic solution of the present invention, which has many innovative features, including at least the following: the cavity structure within the brake pump body 1 is optimized. A preload chamber 13 is added to the existing piston chamber 11 and oil reservoir chamber 12, forming a three-cavity structure within the brake pump body 1, creating a connected oil circuit within the upper brake pump. Furthermore, through the provision of a preload mechanism 5, the preload mechanism 5 pushes the brake fluid, increasing the oil pressure in the oil circuit, so that the brake fluid in the upper brake pump (preload chamber 13, oil reservoir chamber 12, piston chamber 11) always has a tendency to flow toward the lower brake pump. This means that a certain amount of preload is always applied to the brake pad (piston push rod assembly 2), thereby partially offsetting the negative effects of brake pad wear and brake fluid loss, and balancing the loose texture. Furthermore, with the assistance of preload, the user's initial grip on the handle is softer and more comfortable, eliminating the feeling of hitting a wall.

[0064] In addition, it is worth mentioning that the brake pump of the present application has a larger oil storage space through the provision of the pre-compression chamber 13, which can store more brake fluid. If there is a small amount of brake fluid loss, the quality of the braking will not be significantly reduced due to the presence of pre-compression, and the braking effect can be maintained stable and reliable. If the brake fluid loss reaches a certain level, the position of the pre-compression mechanism 5 can be adjusted to compress the working volume of the pre-compression chamber 13, shortening the length of the actual working oil circuit in the brake pump to fill the gap caused by the loss. Therefore, even without adding oil, it can still achieve a good braking effect and a good braking feel.

[0065] Example 2

[0066] The structural composition scheme of the pre-pressing mechanism 5 is diverse and is not specifically limited here. Based on the first embodiment, this embodiment provides a preferred solution, referring to Figures 2 to 8 , as follows:

[0067] Reference Figure 2The prestressing mechanism 5 includes a floating plug assembly 51, a limiting sleeve 52 and a sealing member 53; wherein, the limiting sleeve 52 preferably forms a detachable connection with the mounting opening 131 through a first threaded structure 61 (it may also be a snap-fit ​​structure, a magnetic structure, etc., which is not specifically limited here). The limiting sleeve 52 has a through hole 523, and the floating plug assembly 51 extends into the prestressing chamber 13 after passing through the through hole 523, and the limiting sleeve 52 has a certain degree of limiting function on the floating plug assembly 51, but does not completely constrain the floating plug assembly 51. Therefore, the floating plug assembly 51 can extend forward in the prestressing chamber 13 (reducing the actual working volume of the prestressing chamber 13) or retract backward (expanding the actual working volume of the prestressing chamber 13). On the other hand, the sealing member 53 is arranged between the floating plug assembly 51 and the inner wall of the prestressing chamber 13 to provide an excellent sealing effect to prevent the brake oil from leaking from the gap.

[0068] Based on the above, a specific structural scheme of a floating plug assembly 51 is provided, specifically: Figure 9 The floating plug assembly 51 includes an adjustment operating element 511, a pre-pressed plug body 512, and a limiting element 513. Figures 3 to 6 The adjusting operating element 511 is provided with a limiting groove 5111, and the limiting element 513 is at least partially disposed in the limiting groove 5111; the limiting element 513 is preferably a retaining spring. The limiting element 513 abuts against the front end of the limiting sleeve 52 to form a limiting fit (capable of limiting the retreat of the preload plug body 512), and the adjusting operating element 511 abuts against the rear end of the limiting sleeve 52 to form a limiting fit (capable of limiting the advancement of the preload plug body 512), thereby enabling the adjusting operating element 511 to rotate relative to the limiting sleeve 52. On the other hand, the pre-stress plug body 512 is connected to the adjusting operating element 511 through the second threaded structure 62. When the adjusting operating element 511 rotates, the power of the rotation is transmitted to the pre-stress plug body 512 through the second threaded structure 62, so that the number of threaded matching turns between the pre-stress plug body 512 and the adjusting operating element 511 changes, so that the pre-stress plug body 512 extends forward or retracts backward in the pre-stress chamber 13 to adjust the actual working volume of the pre-stress chamber 13.

[0069] During assembly, first install the seal 53 on the pre-stressing plug body 512, then put the limit sleeve 52 on the adjusting operating element 511, and install the limit element 513 on the adjusting operating element 511, and then realize the connection combination of the adjusting operating element 511 and the pre-stressing plug body 512 through the second threaded structure 62, and then send the adjusting operating element 511 and the pre-stressing plug body 512 into the pre-stressing chamber 13 together, and then connect and fix the limit sleeve 52 to the mounting opening 131 through the first threaded structure 61, and finally manipulate the adjusting operating element 511 to change the position of the pre-stressing plug body 512 in the pre-stressing chamber 13 until the user finds the most suitable state for himself.

[0070] The preferred assembly structure of the seal 53 is as follows: Figure 7 、 Figure 11 The pre-pressing plug body 512 is provided with a sealing groove 5121, and the sealing member 53 is embedded in the sealing groove 5121. The sealing member 53 abuts against the inner wall of the pre-pressing cavity 13 to form a sealing fit. The number of sealing members 53 is preferably two or more to provide multiple sealing effects.

[0071] Based on the above, a specific structural scheme of the adjustment operating element 511 is provided, which is as follows: Figure 9 The adjusting operating element 511 includes an operating section 511a, a limiting section 511b and an adjusting section 511c, which is preferably an integrally formed part with good structural integrity and strength. Figures 3 to 6The operating section 511a is located outside the brake cylinder body 1, making it easy for the user to access and operate it. The limiting sleeve 52 and the limiting element 513 effectively limit the adjustment operating element 511 by limiting the limiting section 511b. The limiting section 511b is located in the through hole 523 of the limiting sleeve 52. The front end of the limiting section 511b forms a limiting fit with the front end of the limiting sleeve 52 through the limiting element 513. The front end of the limiting section 511b forms a limiting fit with the rear end of the limiting sleeve 52 through the first step structure 63. On the other hand, the adjustment section 511c extends into the preload chamber 13 and is connected to the preload plug body 512. Preferably, the preload plug body 512 has an adjustment hole 5122, into which the adjustment section 511c at least partially extends. The second threaded structure 62 includes an internal thread defined in the adjustment hole 5122 and an external thread defined in the adjustment section 511c, with the internal and external threads interlocking. Thus, when a user rotates the adjustment operating element 511, the limiting section 511b and the limiting sleeve 52 cause the adjustment operating element 511 to rotate, thereby changing the number of threads engaged between the preload plug body 512 and the adjustment section 511c, allowing the preload plug body 512 to move forward or backward within the preload chamber 13.

[0072] Optionally, the front end portion of the limit sleeve 52 extends forward to form a stop portion 524, and the stop portion 524 can (through the second step structure 64) abut against the pre-stressing plug body 512 and form a limit stop fit, that is, limiting the maximum retreat distance of the pre-stressing plug body 512 to prevent the pre-stressing plug body 512 from retreating too far and affecting normal use.

[0073] Example 3

[0074] During the adjustment process, the adjustment operating element 511 needs to rotate relative to the limiting sleeve 52. Therefore, if the gap between the limiting section 511b and the limiting sleeve 52 is too small, there will be a large resistance and a jamming problem; if the gap between the limiting section 511b and the limiting sleeve 52 is too large, it is easy to become loose and unstable. In order to solve the above-mentioned possible defects, in some preferred embodiments of the present invention, reference is made to Figures 9 and 10 The limiting section 511b is provided with one or more clearance grooves 5112. The provision of the clearance grooves 5112 allows for a more reasonable gap between the limiting section 511b and the limiting sleeve 52, reducing the amount of contact during rotation, thereby making user operation smoother.

[0075] Preferably, the limiting sleeve 52 is provided with an elastic pre-tightening component 7, and the elastic pre-tightening component 7 can be inserted into any one of the gap grooves 5112. More specifically, referring to Figure 2 、 Figure 4 、 Figure 6 The elastic preload assembly 7 includes a preload screw 71, a first preload spring 72, and a preload bead 73. A preload hole 525 is formed on the limiting sleeve 52, into which the preload screw 71 is threaded. A portion of the preload bead 73 is located within the preload hole 525, while another portion extends outside the preload hole 525 and fits into the clearance groove 5112. The first preload spring 72 is located within the preload hole 525 and abuts between the preload screw 71 and the preload bead 73. The cooperation between the elastic preload assembly 7 and the clearance groove 5112 provides a certain preload force between the limiting section 511b and the limiting sleeve 52, preventing the two from loosening or rotating due to unintentional factors.

[0076] In the present invention, a second preload spring 8 is provided between the preload mechanism 5 and the inner wall of the preload chamber 13. Preferably, the second preload spring 8 contacts the preload plug body 512, thereby acting on the preload plug body 512 to eliminate the thread gap existing in the second thread structure 62, thereby enabling the preload plug body 512 to always maintain a tight fit with the adjustment operating element 511, ensuring reliable operating performance of the preload plug body 512.

[0077] It is worth noting that other technical solutions of the present invention belong to the existing technology and are therefore not described in detail.

[0078] 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 pre-pressure, comprising: A brake pump body (1) is provided with a piston chamber (11) and an oil storage chamber (12), wherein the oil storage chamber (12) is communicated with the piston chamber (11) via an oil replenishing hole (112); A piston push rod assembly (2) located in the piston chamber (11); A brake handle (3) is movably arranged on the brake pump body (1), and the brake handle (3) forms a transmission connection with the piston push rod assembly (2); An oil pipe assembly (4), one end of which is connected to the piston chamber (11) and the other end of which is connected to the brake pump; Its characteristics are: The brake pump body (1) is further provided with a pre-compression chamber (13), the piston chamber (11), the oil storage chamber (12) and the pre-compression chamber (13) are filled with brake oil, one side of the pre-compression chamber (13) is connected to the oil storage chamber (12), and the other side has a mounting opening (131); It also includes a pre-pressing mechanism (5), which extends into the pre-pressing chamber (13) through the installation opening (131), and the pre-pressing mechanism (5) acts on the brake oil in the pre-pressing chamber (13) so that the brake oil always has a movement tendency to flow toward the brake pump.

2. The brake pump with pre-pressure according to claim 1, characterized in that: The pre-pressing mechanism (5) comprises a floating plug assembly (51), a limiting sleeve (52) and a sealing element (53); The limiting sleeve (52) forms a detachable connection with the installation opening (131) via the first threaded structure (61); The limiting sleeve (52) has a through hole (523), and the floating plug assembly (51) extends into the pre-compression chamber (13) after passing through the through hole (523), and the floating plug assembly (51) can extend forward or retract backward in the pre-compression chamber (13); The sealing member (53) is arranged between the floating plug assembly (51) and the inner wall of the pre-compression chamber (13).

3. The brake pump with pre-pressure according to claim 2, characterized in that: The floating plug assembly (51) comprises an adjusting operating element (511), a pre-pressed plug body (512), and a limiting element (513); The regulating operating element (511) is provided with a limiting groove (5111), and the limiting element (513) is at least partially disposed in the limiting groove (5111); The limiting element (513) abuts against the front end of the limiting sleeve (52) to form a limiting fit, and the adjusting operating element (511) abuts against the rear end of the limiting sleeve (52) to form a limiting fit, so that the adjusting operating element (511) can achieve self-rotation relative to the limiting sleeve (52); The pre-pressed plug body (512) is connected to the adjustment operating element (511) via a second threaded structure (62).

4. The brake pump with pre-pressure according to claim 3, characterized in that: The pre-pressing plug body (512) is provided with a sealing groove (5121), the sealing member (53) is embedded in the sealing groove (5121), and the sealing member (53) abuts against the inner wall of the pre-pressing cavity (13) to form a sealing fit; The regulating operating element (511) comprises an operating section (511a), a limiting section (511b) and an regulating section (511c); The operating section (511a) is located outside the brake pump body (1); The limiting section (511b) is located in the through hole (523) of the limiting sleeve (52), and the front end of the limiting section (511b) forms a limiting fit with the front end of the limiting sleeve (52) through the limiting element (513), and the front end of the limiting section (511b) forms a limiting fit with the rear end of the limiting sleeve (52) through the first step structure (63); The regulating section (511c) extends into the pre-pressing chamber (13) and is connected to the pre-pressing plug body (512).

5. The brake pump with pre-pressure according to claim 4, characterized in that: The pre-pressing plug body (512) has an adjustment hole (5122), and the adjustment section (511c) at least partially extends into the adjustment hole (5122); The second thread structure (62) includes an internal thread provided on the adjustment hole (5122) and an external thread provided on the adjustment section (511c), wherein the internal thread and the external thread engage with each other; When a user rotates the adjustment operating element (511), the adjustment operating element (511) rotates under the action of the limiting section (511b) and the limiting sleeve (52), thereby changing the number of threads of the pre-pressing plug body (512) and the adjustment section (511c), so that the pre-pressing plug body (512) moves forward or backward in the pre-pressing chamber (13).

6. The brake pump with pre-pressure according to claim 2, characterized in that: The front end portion of the limiting sleeve (52) extends forward to form a stop portion (524), and the stop portion (524) can abut against the pre-pressing plug body (512) to form a limiting and anti-retraction fit.

7. The brake pump with pre-pressure according to claim 4, characterized in that: One or more clearance grooves (5112) are provided on the limiting section (511b).

8. The brake pump with pre-pressure according to claim 7, characterized in that: The limiting sleeve (52) is provided with an elastic pre-tightening component (7), and the elastic pre-tightening component (7) can be inserted into any one of the gap grooves (5112).

9. The brake pump with pre-pressure according to claim 8, characterized in that: The elastic pre-tightening assembly (7) includes a pre-tightening screw (71), a first pre-tightening spring (72), and a pre-tightening top bead; Wherein, a pre-tightening hole (525) is provided on the limiting sleeve (52), and the pre-tightening screw (71) is threadedly connected in the pre-tightening hole (525); A portion of the pre-tightening ball is located in the pre-tightening hole (525), and another portion extends out of the pre-tightening hole (525) and can be inserted into the clearance groove (5112); The first pre-tightening spring (72) is located in the pre-tightening hole (525), and the first pre-tightening spring (72) abuts between the pre-tightening screw (71) and the pre-tightening top bead (73).

10. The brake pump with pre-pressure according to any one of claims 1 to 9, characterized in that: A second preload spring (8) is provided between the preload mechanism (5) and the inner wall of the preload chamber (13).

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