A force arm adjustable brake upper pump

Abstract

A force arm adjustable brake upper pump, comprising a brake pump body, a brake handle, and a piston push rod assembly extending into the brake pump body; a grip force input position is where a user holds the brake handle, a rotating fulcrum position is where the brake pump body is connected with the brake handle, a push force output position is where the piston push rod assembly is connected with the brake handle, and the rotating fulcrum position is between the grip force input position and the push force output position; a distance between the rotating fulcrum position and a force exertion position of the user's hand holding the brake handle forms an input force arm, and a distance between the rotating fulcrum position and the push force output position forms an output force arm; a first force arm adjustable mechanism is arranged at the rotating fulcrum position, and the first force arm adjustable mechanism can change a rotating center of the brake handle relative to the brake pump body. The present application realizes adjustment of a brake force arm according to user's own needs, provides different brake effects for the user before and after adjustment, outputs different piston pushing forces under the same grip force, and meets the needs.

Description

Technical Field

[0001] This invention relates to the technical field of hydraulic brake products, and in particular to a brake upper pump with adjustable lever arm. Background Technology

[0002] A brake is a device that decelerates, stops, or keeps a moving part (or machine) at a stop. It is a mechanical part that stops or slows down moving parts in machinery. Commonly known as a brake or brake lever. A brake mainly consists of a frame, braking components, and an operating device. Some brakes also have an automatic adjustment device for the clearance of the braking components. To reduce braking torque and structural dimensions, brakes are usually mounted on the high-speed shaft of the equipment. However, for large equipment with high safety requirements (such as mine hoists and elevators), brakes should be mounted on the low-speed shaft closer to the working part of the equipment.

[0003] In vehicles such as bicycles, the device used to control braking is called a brake lever (commonly known as a brake handle). A brake lever is a handle used when braking, and it's found on bicycle brake levers, children's bicycle brake levers, electric vehicle brake levers, motorcycle brake levers, etc. Traditionally, during the installation of brake cables on electric vehicles, bicycles, tricycles, etc., wire cutters, wrenches, and other traditional tools are used in conjunction with brute force to tighten them. This traditional method of tightening the cables has many shortcomings and is difficult to operate. For example, the cables easily slip out of the wire cutters or wrenches, and it's not easy to adjust the tightness, making it particularly time-consuming and laborious. To achieve braking efficiency and precision, hydraulic brakes are now widely used in vehicles on the market (such as cars, motorcycles, and bicycles). The principle is that one end of a brake line is connected to the output end of the internal hydraulic circuit of a brake lever seat, while the other end of the brake line is connected to a disc brake. Pressing the lever actuates a piston rod in the internal hydraulic circuit, causing the pressure in the hydraulic circuit to act on the disc brake through the brake line, thus creating the disc brake operation.

[0004] Torque is a physical quantity that represents the rotational effect produced when a force acts on an object. The product of force and lever arm is called the torque about the axis of rotation. That is, the magnitude of the torque about a point is the length of the perpendicular line drawn from that point to the line of action of the force (i.e., the lever arm) multiplied by the magnitude of the force. Its direction is perpendicular to the plane formed by the perpendicular line and the force, determined using the right-hand screw rule for torque. Torque can give an object angular acceleration and can change the object's angular momentum. For the same object, the larger the torque, the easier it is to change its rotational state.

[0005] Torque is a physical quantity that causes a force to rotate on an object. It can be divided into the moment of a force about an axis and the moment of a force about a point. That is: M = r × F. Where r is the position vector from the axis of rotation to the point of force application, and F is the vector force; torque is also a vector.

[0006] When the brake pump is working, the brake lever rotates relative to the brake pump body to push the piston rod assembly forward. The force exerted is the same as the torque. The connection point between the brake pump body and the brake lever is defined as the pivot point. The distance between the pivot point and the point where the user applies force with their hand on the brake lever forms the input lever arm, and the distance between the pivot point and the output lever forms the output lever arm. The input torque equals the output torque. Assuming the magnitudes of the input and output torques remain constant, if a more direct piston thrust is desired and the user's grip force is reduced, the input lever arm needs to be increased. Conversely, if an increased output stroke is desired for a more linear brake feel, the input lever arm needs to be decreased.

[0007] Prior art, referring to patent document CN218288013U, discloses a brake cylinder with an adjustable handle, including a brake handle, a handle seat, a cylinder body, and a piston assembly. The piston assembly is disposed on the cylinder body, and the brake handle and handle seat are respectively hinged to the cylinder body. A compression spring is disposed between the brake handle and the handle seat. A knob adjuster for adjusting the brake lever opening degree is rotatably disposed on the brake handle, and the knob adjuster includes a cam and a knob connected to each other. The handle seat is provided with a pushing part and a pressing part. The pushing part is connected to the piston rod of the piston assembly and is used to push the piston rod forward to drive the brake. The pressing part abuts against the cam. This utility model achieves the opening degree of the brake lever in the reset state, i.e., the distance between the brake lever and the handlebar, by varying the distance between the outer surface of the cam and the cam shaft. Users can adjust it according to the size of their hands, making it convenient for driving. Moreover, the adjustment is convenient and can be applied to the brake lever of disc brakes. A knob adjuster is installed on the brake lever, and a pressing part is provided on the lever base to abut against the knob adjuster's cam. The distance between the outer side of the cam and the cam shaft varies, thus adjusting the opening size of the brake lever in its reset state—that is, the distance between the brake lever and the handlebars. Users can adjust this according to their hand size for ease of use. Adjustment is quick and easy; simply rotate the knob adjuster. The lever base also includes a pushing part and a pressing part, allowing the knob adjuster to be used with disc brake levers.

[0008] While the aforementioned brake patent technology possesses some adjustment capabilities, its structure is outdated, its practicality is limited, and it has not been widely adopted in the market. After comparison, the applicant discovered at least the following defects: 1. The patent essentially adjusts the distance between the handlebar and the brake lever to accommodate different user hand sizes, i.e., it adjusts the grip distance; the connection point between the brake lever and the pump body is a fixed structure, meaning the input and output lever arms are not adjustable, resulting in a lack of true torque adjustment functionality; 2. For the same user, the existing brake lever cannot adjust the ratio of piston push rod assembly stroke to piston thrust during braking according to individual needs, nor can it adjust the ratio of grip force to piston thrust; 3. To meet the different users' needs for grip force and piston thrust, customized brake pumps are required. If a single user requires different braking effects, multiple different brake pumps need to be purchased, significantly increasing the user's operating costs.

[0009] When using the horizontal lever brake pump, the user holds one end of the brake handle, and the piston push rod assembly is connected to the other end of the brake handle. At the same time, the connection between the brake handle and the brake pump body is the center of rotation. During operation, the center of rotation is located between the two ends of the brake handle. Therefore, one end is pressed down and the other end is pushed out, thus satisfying the lever balance condition. The lever principle can be used for force analysis.

[0010] In a vertical cylinder brake upper pump, the connection point between the brake handle and the brake body is the handle's rotation center, and this rotation center remains constant. A certain point on the brake handle connects to and interacts with the piston push rod assembly to transmit downward force. During operation, the rotation center is located at the end of the brake handle. Therefore, when the hand presses down, the piston push rod assembly also presses down simultaneously, which does not fully satisfy the lever balance condition. Therefore, the lever principle is not applicable for force analysis.

[0011] This invention primarily addresses and improves upon the defects present in the structure of the crossbar brake, and this is hereby stated. Summary of the Invention

[0012] In order to overcome the above-mentioned shortcomings of the prior art, the present invention provides a brake upper pump with adjustable lever arm, so as to provide different braking effects to the user before and after adjustment according to the user's own needs. That is, it can output different piston thrusts under the same grip force to meet diverse needs.

[0013] The technical solution of the present invention to solve its technical problem is: a brake upper pump with adjustable lever arm, comprising a brake pump body, a brake handle rotatably connected to the brake pump body, and a piston push rod assembly connected to the brake handle and at least partially extended into the brake pump body. The point where the user holds the brake lever is the grip force input position, the connection point between the brake pump body and the brake lever is the rotation fulcrum position, the connection point between the piston push rod assembly and the brake lever is the thrust output position, and the rotation fulcrum position is located between the grip force input position and the thrust output position. The distance between the pivot point and the point where the user applies force to the brake lever forms the input lever arm, and the distance between the pivot point and the thrust output point forms the output lever arm. A first lever arm adjustable mechanism is provided at the rotation fulcrum position, and the first lever arm adjustable mechanism can change the rotation center of the brake handle relative to the brake pump body. When the first adjustable lever arm mechanism moves the rotation center closer to the piston push rod assembly, it increases the input lever arm and decreases the output lever arm, thereby increasing the ratio of the input lever arm to the output lever arm. When the first adjustable lever arm mechanism moves the rotation center away from the piston push rod assembly, it reduces the input lever arm and increases the output lever arm, thereby reducing the ratio of the input lever arm to the output lever arm.

[0014] A further provision regarding the above technical method is that a pivoting mechanism is provided at the rotation fulcrum position; The pivoting mechanism includes a rotating connecting shaft, a first rotating bearing mounted on the rotating connecting shaft, and a first connecting screw; The brake pump body and the brake handle are provided with a first connecting hole, and the rotating connecting shaft is inserted into the first connecting hole. The first connecting screw limits the first rotating bearing to the rotating connecting shaft, the rotating connecting shaft is at least partially inserted into the first rotating bearing, and the outer wall of the first rotating bearing is in contact with the brake pump body.

[0015] In some preferred embodiments of the present invention, the first lever arm adjustable mechanism includes an eccentric hole formed in the rotating connecting shaft, and the first connecting screw is assembled into the eccentric hole to form the rotation center. The rotating connecting shaft can rotate relative to the first connecting hole, thereby changing the position of the eccentric hole and adjusting the position of the rotating fulcrum to increase or decrease the ratio of the input force arm to the output force arm.

[0016] A further preferred embodiment of the above embodiment includes an adjustment mechanism that acts on the first adjustable lever arm mechanism.

[0017] One specific embodiment is that the adjusting mechanism includes an adjusting worm gear and a worm gear thread formed on the rotating connecting shaft; The adjustable worm gear meshes with the worm wheel teeth, thereby driving the rotating connecting shaft to rotate, so as to adjust the position of the eccentric hole relative to the thrust output position.

[0018] Furthermore, the adjusting mechanism also includes a retaining ring, and the adjusting worm is limited and connected to the brake handle by the retaining ring, so that the adjusting worm can rotate relative to the brake handle and drive the rotating connecting shaft to rotate.

[0019] Another specific method is that the adjusting mechanism includes several positioning holes formed on the outer periphery of the rotating connecting shaft and positioning fasteners. The positioning fasteners can be inserted into any one of the positioning holes so that the rotating connecting shaft is fixedly connected to the brake handle.

[0020] In this invention, a transmission reversing mechanism is provided at the thrust output position, and the piston push rod assembly forms a transmission cooperation with the brake handle through the transmission reversing mechanism.

[0021] Specifically, the transmission reversing mechanism includes a fixed connecting shaft, a second rotating bearing mounted on the fixed connecting shaft, and a second connecting screw; The piston push rod assembly is fixedly fitted with the fixed connecting shaft, and the second connecting screw connects the piston push rod assembly to the fixed connecting shaft. The fixed connecting shaft passes through the second rotating bearing, and the outer wall of the second rotating bearing abuts against the brake handle.

[0022] In some preferred embodiments of the present invention, the first adjustable lever mechanism includes a plurality of mounting holes formed on the brake handle, and the distance between each mounting hole and the thrust output position is different; the pivoting mechanism can be assembled into any one of the mounting holes to form the rotation center.

[0023] The beneficial effects of this invention are as follows: First, by setting up an adjustable first lever arm mechanism, the ratio of the input lever arm to the output lever arm can be increased or decreased. Therefore, if the user has less force and needs a larger and more direct piston thrust, the input lever arm can be increased to obtain a larger piston thrust F2 while keeping the grip force F1 constant. If the user has more force and needs a longer and more flexible braking feel, the input lever arm can be decreased to obtain a smaller piston thrust F2 while keeping the grip force F1 constant, thus requiring a larger stroke of the brake lever to achieve the same piston thrust F2.

[0024] Second, the adjustable first lever arm mechanism can be integrated into the pivoting mechanism, thus directly borrowing most of the existing brake pump structure without redesigning, producing, or verifying. The overall solution is more reasonable, the structure is sufficiently stable and reliable, and it is easy to process and produce.

[0025] Third, the adjustable distance mechanism has a simple and reasonable structure, is easy to operate, and is conducive to users directly adjusting the first lever arm adjustable mechanism.

[0026] IV. In this invention, the rotation fulcrum is located between the grip force input position and the thrust output position, which is suitable for the horizontal bar brake pump. Attached Figure Description

[0027] Figure 1 This is a schematic diagram illustrating the application of the present invention.

[0028] Figure 2 This is a schematic diagram of the structure of the present invention.

[0029] Figure 3 This is a partial exploded view of the structure of the present invention.

[0030] Figure 4 This is a comparative schematic diagram of the lever arm before and after adjustment in this invention.

[0031] Figure 5 This is a schematic diagram comparing the torque before and after lever arm adjustment according to the present invention.

[0032] Figure 6 This is a schematic diagram illustrating the principle of torque change.

[0033] Figure 7 This is a schematic diagram of the adjustable worm gear in this invention.

[0034] Figure 8 This is a schematic diagram of the rotating connecting shaft in this invention.

[0035] Figure 9 This is a partial assembly diagram of the second example in Embodiment 4.

[0036] Figure 10 This is a partial exploded view of the structure of the second example in Embodiment 4.

[0037] Figure 11 This is a partial structural schematic diagram of Embodiment 4.

[0038] Figure 12 This is a schematic diagram of the existing technology.

[0039] In the diagram: 1. Brake pump body; 2. Brake handle; 3. Piston push rod assembly; 4. Oil pipe; 5. Lower brake pump; 6. Rotation fulcrum position; 7. Thrust output position; R1. Input force arm; R2. Output force arm; F1. Grip force; F2. Piston thrust; 8. Pivoting mechanism; 801. Rotating connecting shaft; 8011. Eccentric hole; 802. First rotating bearing; 803. First connecting screw; 9. Transmission reversing mechanism; 901. Fixed type 902. Connecting shaft; 903. Second rotating bearing; 904. Second connecting screw; 10. First connecting hole; 11. Adjusting mechanism; 1101. Adjusting worm gear; 1102. Worm gear thread; 1103. Snap ring; 1104. Locking screw; 1105. Screw head; 1106. Knurling; 1107. Anti-reverse groove; 1108. Positioning hole; 1109. Positioning fastener; 12. Mounting hole; a. Rotation center; 13. Hand. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example 1

[0041] Reference Figures 1-12 An adjustable-arm brake upper pump includes a brake pump body 1, a brake handle 2 rotatably connected to the brake pump body 1, and a piston push rod assembly 3 connected to the brake handle 2 and at least partially inserted into the brake pump body 1. In use, the brake pump body 1 is connected to a brake lower pump 5 via an oil pipe 4, and brake fluid is injected into the brake pump body 1. When the piston push rod assembly 3 is pushed forward, it can push the brake fluid through the oil pipe 4 to the brake lower pump 5. The point where the user holds the brake handle 2 is the grip force input position F1. The connection point between the brake pump body 1 and the brake handle 2 is the rotation fulcrum position 6, and the connection point between the piston push rod assembly 3 and the brake handle 2 is the thrust output position 7. The rotation fulcrum position 6 is located between the grip force input position F1 and the thrust output position 7. The distance between the rotation fulcrum position 6 and the point where the user applies force while holding the brake handle 2 forms the input force arm R1, and the distance between the rotation fulcrum position 6 and the thrust output position 7 forms the output force arm R2.

[0042] In the prior art, the rotation fulcrum 6 is fixed and unique, and the connection between the piston push rod assembly 3 and the brake handle 2 is also fixed and unique. Therefore, the ratio of the input force arm R1 to the output force arm R2 in a single brake pump remains constant. In this invention, a first force arm adjustable mechanism is provided at the rotation fulcrum 6. This first force arm adjustable mechanism can change the rotation center a of the brake handle 2 relative to the brake pump body 1. When the first force arm adjustable mechanism moves the rotation center a closer to the piston push rod assembly 3, the input force arm R1 is increased, while the output force arm R2 is decreased, thereby increasing the ratio of the input force arm R1 to the output force arm R2. When the first force arm adjustable mechanism moves the rotation center a away from the piston push rod assembly 3, the input force arm R1 is decreased, while the output force arm R2 is increased, thereby decreasing the ratio of the input force arm R1 to the output force arm R2.

[0043] The above structure is the main solution of the present invention. It realizes the adjustment of the ratio of input arm R1 to output arm R2 through the setting of the first adjustable lever arm mechanism.

[0044] The corresponding formulas for torque in the brake booster are: gripping force F1 = input lever arm R1 / input torque M1, piston thrust F2 = output lever arm R2 / output torque M2. In the same brake booster, input torque M1 = output torque M2.

[0045] In summary, if the user has less force and needs a larger and more direct piston thrust F2, they can increase the input lever arm R1 to obtain a larger piston thrust F2 while keeping the grip force F1 constant. Conversely, if the user has more force and needs a longer and more flexible braking feel, they can decrease the input lever arm R1 to obtain a smaller piston thrust F2 while keeping the grip force F1 constant. This results in a greater stroke of the brake lever 2 required to achieve the same piston thrust F2. The greater the piston thrust F2, the greater the amount of brake fluid pushed forward to the lower brake pump 5, leading to a more noticeable braking effect.

[0046] The pivot point 6 serves as the rotation axis for the brake handle 2, meaning the brake handle 2 can rotate relative to the brake pump body 1 with the pivot point 6 as the rotation center a. To achieve this rotational engagement, a preferred method is to provide a pivot mechanism 8 at the pivot point 6. Specifically, the pivot mechanism 8 includes a rotating connecting shaft 801, a first rotating bearing 802 mounted on the rotating connecting shaft 801, and a first connecting screw 803. A first connecting hole 10 is provided at the connection point between the brake pump body 1 and the brake handle 2, providing installation space for the rotating connecting shaft 801, allowing it to be inserted into the first connecting hole 10. The first connecting screw 803 limits the first rotating bearing 802 to the rotating connecting shaft 801, ensuring that the rotating connecting shaft 801 is at least partially inserted into the first rotating bearing 802, with the outer wall of the first rotating bearing 802 abutting against the brake pump body 1. While ensuring that the first rotary bearing 802 can provide rotational support, a limit is formed in its non-rotational direction to prevent it from leaving the work position, so as to ensure stability during use, so that when the brake handle 2 is subjected to force, it can rotate relative to the brake pump body 1 through the action of the first rotary bearing 802.

[0047] The thrust output position 7 serves as the output center when the brake handle 2 is in use. It needs to convert the rotational force of the brake handle 2 into the forward thrust of the piston push rod assembly 3. In order to realize the power reversal and transmission function, it is also necessary to realize the rotational engagement between the piston push rod assembly 3 and the brake handle 2. The preferred structure adopted is as follows: a transmission reversing mechanism 9 is provided at the thrust output position 7, and the piston push rod assembly 3 forms a transmission engagement with the brake handle 2 through the transmission reversing mechanism 9. Specifically, the transmission reversing mechanism 9 includes a fixed connecting shaft 901, a second rotating bearing 902 mounted on the fixed connecting shaft 901, and a second connecting screw 903; wherein, the piston push rod assembly 3 forms a fixed engagement with the fixed connecting shaft 901, the second connecting screw 903 connects the piston push rod assembly 3 to the fixed connecting shaft 901, the fixed connecting shaft 901 passes through the second rotating bearing 902, and the outer wall of the second rotating bearing 902 abuts against the brake handle 2.

[0048] In this invention, the components of the pivoting mechanism 8 and the transmission reversing mechanism 9 are quite similar. The pivoting mechanism 8 converts the gripping force F1 into rotational force, and the transmission reversing mechanism 9 converts the rotational force into forward thrust. The other components are similar to those in the prior art, and the working mechanism is similar, so they will not be described in detail here. Example 2

[0049] In this invention, there are various optional configurations for the aforementioned adjustable first lever arm mechanism. A preferred embodiment is provided below: (Refer to...) Figures 3-6The first adjustable lever arm mechanism includes an eccentric hole 8011 formed in the rotating connecting shaft 801. The first connecting screw 803 is assembled into the eccentric hole 8011 to form the rotation center a. Each time the eccentric hole 8011 is changed, a new rotation fulcrum position 6 (i.e., the rotation shaft of the torque during braking) is formed.

[0050] During the adjustment process, the rotating connecting shaft 801 can rotate relative to the first connecting hole 10, thereby changing the position of the eccentric hole 8011, and thus adjusting the rotating fulcrum 6. This allows the eccentric hole 8011 to change position relative to the force application point and the thrust output point 7 of the user's handheld brake handle 2, thereby adjusting the size of the input force arm R1 and the output force arm R2, and increasing or decreasing the ratio of the input force arm R1 to the output force arm R2. Example 3

[0051] Based on the structural foundation of the second basic embodiment, this embodiment provides two preferred adjustable distance mechanisms 11 that act on the first adjustable lever arm mechanism.

[0052] I. Reference Figures 3-8 The adjusting mechanism 11 includes an adjusting worm gear 1101 and a worm gear thread 1102 formed on the rotating connecting shaft 801. The adjusting worm gear 1101 meshes with the worm gear thread 1102, thereby driving the rotating connecting shaft 801 to rotate, thus adjusting the position of the eccentric hole 8011 relative to the thrust output position 7. Furthermore, for the installation and use of the adjusting worm gear 1101, the adjusting mechanism 11 also includes a retaining ring 1103. The adjusting worm gear 1101 is limited and connected to the brake handle 2 by the retaining ring 1103, so that the adjusting worm gear 1101 can rotate relative to the brake handle 2 and drive the rotating connecting shaft 801 to rotate. Thus, the adjusting worm gear 1101 can be manually operated to rotate under the limitation of the retaining ring 1103, thereby driving the rotating connecting shaft 801 to rotate through the worm gear thread 1102, and thus adjusting the relative position of the eccentric hole 8011.

[0053] The structure of the adjustable worm gear 1101 and the worm wheel thread 1102 is a preferred example and is not intended to limit the invention. Other similar methods such as bevel gears and bevel threads can also be used instead. Any simple modifications, changes, and equivalent structural changes made to the above embodiments shall still fall within the protection scope of the technical solution of the present invention.

[0054] Preferably, a locking screw 1104 is also included. After the first lever arm adjustable mechanism is adjusted, it needs to be locked in its current position by screwing in the locking screw 1104. This causes the locking screw 1104 to form a structural interference with the first lever arm adjustable mechanism, thereby restricting the continued movement of the first lever arm adjustable mechanism and achieving a limiting and locking effect. When it is necessary to adjust the first lever arm adjustable mechanism, the locking screw 1104 is loosened, and the structure is misaligned to eliminate interference, thus allowing the first lever arm adjustable mechanism to continue moving.

[0055] Preferably, one end of the adjusting worm gear 1101 has a threaded portion 1105 protruding from the brake handle 2. The threaded portion 1105 has knurling 1106 to increase the friction when the user's hand contacts it, making operation easier. The other end of the adjusting worm gear 1101 has an anti-reverse groove 1107. At least a portion of the retaining spring 1103 is inserted into the anti-reverse groove 1107, and the other portion forms a limiting engagement with the brake handle 2 to provide a limiting and anti-disengagement function.

[0056] II. Reference Figures 3-4 The adjusting mechanism 11 includes several positioning holes 1108 formed on the outer periphery of the rotating connecting shaft 801, and positioning fasteners 1109. The positioning fasteners 1109 can be inserted into any one of the positioning holes 1108 to fix the rotating connecting shaft 801 to the brake handle 2. In use, after loosening the positioning fasteners 1109, the user can directly act on the pivoting mechanism 8 to rotate the rotating connecting shaft 801, thereby adjusting the relative position of the eccentric hole 8011. After adjustment, the positioning fasteners 1109 are tightened again to fix the rotating connecting shaft 801 in the current position and prevent it from loosening. Example 4

[0057] In this invention, there are various optional configurations for the aforementioned adjustable first lever arm mechanism. Here, another preferred embodiment, different from Embodiment 2, is provided as follows: (Refer to...) Figures 9-10 The first adjustable lever arm mechanism includes multiple mounting holes 12 formed on the brake handle 2, and the distance between each mounting hole 12 and the thrust output position 7 is different. In use, the user can assemble the pivot mechanism 8 into any of the mounting holes 12 according to their own needs to form the actual working rotation fulcrum position 6. This embodiment serves as a support case for the first adjustable lever arm mechanism in Embodiment 1. Compared with Embodiment 2, it requires multiple mounting holes 12 with different positions to be pre-formed on the brake handle 2 for the user to choose from, thereby achieving the same function of realizing different ratios of input lever arm R1 and output lever arm R2 in the same brake pump. Example 5

[0058] In some preferred embodiments of the present invention, in order to diversify the adjustment methods of the input lever arm R1 and the output lever arm R2, a second lever arm adjustable mechanism is also provided at the thrust output position 7 to increase or decrease the ratio of the input lever arm R1 to the output lever arm R2. The second lever arm adjustable mechanism may adopt the same or similar structure as the first lever arm adjustable mechanism in the aforementioned embodiments, and will not be described in detail here.

[0059] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the technical essence of the invention shall still fall within the protection scope of the present invention.

Claims

1. A lever-arm adjustable brake upper pump, comprising a brake pump body (1), a brake handle (2) rotatably connected to the brake pump body (1), and a piston push rod assembly (3) connected to the brake handle (2) and at least partially extended into the brake pump body (1); The user grips the brake handle (2) at the grip force (F1) input position, the connection between the brake pump body (1) and the brake handle (2) is the rotation fulcrum position (6), the connection between the piston push rod assembly (3) and the brake handle (2) is the thrust output position (7), and the rotation fulcrum position (6) is located between the grip force (F1) input position and the thrust output position (7). The distance between the rotation fulcrum (6) and the point where the user applies force with the hand-held brake handle (2) forms the input force arm (R1), and the distance between the rotation fulcrum (6) and the thrust output position (7) forms the output force arm (R2). Its features are: A first lever arm adjustable mechanism is provided at the rotation fulcrum (6), which can change the rotation center (a) of the brake handle (2) relative to the brake pump body (1). When the first adjustable lever arm mechanism moves the rotation center (a) closer to the piston push rod assembly (3), it increases the input lever arm (R1) and decreases the output lever arm (R2), thereby increasing the ratio of the input lever arm (R1) to the output lever arm (R2). When the first adjustable lever arm mechanism moves the rotation center (a) away from the piston push rod assembly (3), the input lever arm (R1) is reduced, while the output lever arm (R2) is increased, thereby reducing the ratio of the input lever arm (R1) to the output lever arm (R2). A pivoting mechanism (8) is provided at the pivot point (6); The pivoting mechanism (8) includes a rotating connecting shaft (801), a first rotating bearing (802) mounted on the rotating connecting shaft (801), and a first connecting screw (803); The brake pump body (1) and the brake handle (2) are connected by a first connecting hole (10), and the rotating connecting shaft (801) is inserted into the first connecting hole (10). The first connecting screw (803) limits the first rotating bearing (802) to the rotating connecting shaft (801), the rotating connecting shaft (801) is at least partially inserted into the first rotating bearing (802), and the outer wall of the first rotating bearing (802) is in contact with the brake pump body (1). The first lever arm adjustable mechanism includes an eccentric hole (8011) opened in the rotating connecting shaft (801), and the first connecting screw (803) is assembled into the eccentric hole (8011) to form the rotation center (a). The rotating connecting shaft (801) can rotate relative to the first connecting hole (10), thereby changing the position of the eccentric hole (8011) and adjusting the rotation fulcrum position (6) to increase or decrease the ratio of the input force arm (R1) to the output force arm (R2).

2. The brake upper pump with adjustable lever arm according to claim 1, characterized in that: It also includes a distance adjustment mechanism (11) that acts on the first adjustable lever arm mechanism.

3. The brake upper pump with adjustable lever arm according to claim 2, characterized in that: The adjusting mechanism (11) includes an adjusting worm gear (1101) and a worm gear thread (1102) formed on the rotating connecting shaft (801); The adjustable worm gear (1101) meshes with the worm wheel thread (1102), thereby driving the rotating connecting shaft (801) to rotate, so as to adjust the position of the eccentric hole (8011) relative to the thrust output position (7).

4. The adjustable brake upper pump according to claim 3, characterized in that: The adjusting mechanism (11) further includes a retaining ring (1103). The adjusting worm (1101) is limited and connected to the brake handle (2) by the retaining ring (1103), so that the adjusting worm (1101) can rotate relative to the brake handle (2) and drive the rotating connecting shaft (801) to rotate.

5. The brake upper pump with adjustable lever arm according to claim 2, characterized in that: The adjusting mechanism (11) includes a plurality of positioning holes (1108) opened on the outer periphery of the rotating connecting shaft (801) and positioning fasteners (1109). The positioning fasteners (1109) can be inserted into any one of the positioning holes (1108) so that the rotating connecting shaft (801) is fixedly connected to the brake handle (2).

6. The adjustable brake upper pump according to claim 1, characterized in that: A transmission reversing mechanism (9) is provided at the thrust output position (7), and the piston push rod assembly (3) forms a transmission cooperation with the brake handle (2) through the transmission reversing mechanism (9).

7. The brake upper pump with adjustable lever arm according to claim 6, characterized in that: The transmission reversing mechanism (9) includes a fixed connecting shaft (901), a second rotating bearing (902) mounted on the fixed connecting shaft (901), and a second connecting screw (903); The piston push rod assembly (3) is fixedly fitted with the fixed connecting shaft (901), and the second connecting screw (903) connects the piston push rod assembly (3) to the fixed connecting shaft (901). The fixed connecting shaft (901) passes through the second rotating bearing (902), and the outer wall of the second rotating bearing (902) abuts against the brake handle (2).

8. The brake upper pump with adjustable lever arm according to claim 1, characterized in that: The first adjustable lever arm mechanism includes multiple mounting holes (12) on the brake handle (2), and the distance between each mounting hole (12) and the thrust output position (7) is different; the pivoting mechanism (8) can be assembled into any one of the mounting holes (12) to form the rotation center (a).

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