Hand change

Abstract

The utility model discloses a hand transformer which comprises a hand transformer body, an oil cylinder assembly, a brake assembly, a connecting rotating arm and an adjusting piece, the oil cylinder assembly is arranged on the hand transformer body, and one end of the brake assembly and the middle of the connecting rotating arm are both connected to the hand transformer body in a rotating mode. The adjusting part is arranged at one end of the brake assembly, the extending length of the adjusting part can be adjusted relative to the brake assembly, one end of the connecting rotating arm abuts against the adjusting part, and the other end of the connecting rotating arm is connected with the oil cylinder assembly; and the holding distance of the brake assembly relative to the hand change main body is adjusted by adjusting the extension length of the adjusting piece. According to the utility model, by adjusting the extension length of the adjusting piece, the holding distance of the brake assembly relative to the hand-changing main body is adjusted, so that the adjusting process is simple, and complicated adjusting steps are not needed.

Description

TECHNICAL FIELD

[0001] The utility model relates to a bicycle technical field especially relates to a hand change. BACKGROUND

[0002] The hand change of the road bicycle is a key component in the whole vehicle transmission system, which not only bears the speed control function, but also serves as an important support structure for the rider to hold. During a long time of riding, a reasonable holding posture is crucial to the comfort and riding experience of the user. However, due to the difference in the size of the palms of different users, especially for users with small palms, they may face the problem of too large brake holding distance when holding the hand change. This not only may cause hand fatigue during a long time of riding, but also may lead to insufficient braking force due to too large holding distance during emergency braking, affecting the braking response speed, and thus causing safety accidents.

[0003] In the prior art, some hand changes of road bicycles have certain holding distance adjustment function, but generally have the following defects: the adjustment process of the adjustment mechanism is complicated, the user's operation is inconvenient, and the components may also be loose. SUMMARY

[0004] The utility model aims at providing a hand change, which aims to solve the problem of complicated adjustment process of the holding distance adjustment of the hand change in the prior art.

[0005] To solve the above technical problems, the utility model aims to realize the following technical scheme: a hand change is provided, which comprises a hand change main body, an oil cylinder assembly, a brake assembly, a connecting swing arm and an adjusting piece. The oil cylinder assembly is arranged on the hand change main body. One end of the brake assembly and the middle part of the connecting swing arm are both rotationally connected to the hand change main body. The adjusting piece is arranged at one end of the brake assembly, and the adjusting piece can adjust the extension length relative to the brake assembly. One end of the connecting swing arm abuts against the adjusting piece, and the other end of the connecting swing arm is connected to the oil cylinder assembly. The holding distance adjustment of the brake assembly relative to the hand change main body is realized by adjusting the extension length of the adjusting piece.

[0006] Further, the brake assembly comprises a brake lever and a brake main body. The brake main body comprises a brake frame, a swing arm shaft, a first elastic piece for resetting the brake lever, and a second elastic piece for keeping the connecting swing arm abutting against the adjusting piece. The brake lever is connected to the brake frame. The swing arm shaft is arranged on the brake frame, and the brake frame and the connecting swing arm pivot around the swing arm shaft. The first elastic piece and the second elastic piece are respectively sleeved on the swing arm shaft.

[0007] Further, the brake body further comprises a bushing, one end of the connecting arm is provided with a first arm through hole, the arm shaft passes through the first arm through hole and is connected with the brake frame and the hand change body at both ends in sequence, the bushing is sleeved on the arm shaft, the first elastic member and the second elastic member are sleeved on the bushing respectively, one end of the first elastic member is connected with the brake frame, and the other end is connected with the hand change body; one end of the second elastic member is connected with one end of the connecting arm, and the other end is connected with the brake body.

[0008] Further, one end of the connecting arm extends out a bearing part, the brake frame is provided with an adjusting hole for at least partially accommodating the adjusting member, one end of the adjusting member is connected in the adjusting hole, and the other end is abutted on the bearing part, the adjusting member and the oil cylinder assembly are located on the same side of the connecting arm, and the adjusting member adjusts the extension length through the adjusting hole to drive the brake assembly to be close to or away from the hand change body.

[0009] Further, the adjusting member is an adjusting screw, and the adjusting hole is a threaded hole.

[0010] Further, the brake frame is provided with a brake adjusting shaft and a third elastic member, one end of the brake lever is sleeved on the brake adjusting shaft with the third elastic member, the brake lever can rotate around the brake adjusting shaft to form an avoiding space, the adjusting member is located in the avoiding space, one end of the third elastic member is connected with the brake lever, and the other end is connected with the brake frame to reset the brake lever.

[0011] Further, the other end of the connecting arm is provided with a first connecting part and a second connecting part in protrusion, the first connecting part and the second connecting part are arranged at intervals, the first connecting part is provided with a second arm through hole, the second connecting part is provided with a third arm through hole, a bearing ring and a bearing pin are arranged between the first connecting part and the second connecting part, the bearing ring is clamped between the second arm through hole and the third arm through hole, the bearing pin passes through the second arm through hole, the third arm through hole and the bearing ring at the same time, and the bearing ring is abutted with one end of the oil cylinder assembly.

[0012] Further, the extension length of the adjusting member is positively correlated with the grip distance.

[0013] Further, the maximum grip distance of the brake assembly relative to the hand change body is less than or equal to 90mm.

[0014] Further, the maximum included angle of the brake assembly relative to the hand change body is greater than or equal to 33°.

[0015] The utility model discloses an embodiment provides a hand change, including hand change main part, oil cylinder subassembly, brake assembly, connecting swing arm and adjusting piece, oil cylinder subassembly sets up on hand change main part, and one end of brake assembly and the middle part of connecting swing arm all rotationally connected on hand change main part, and adjusting piece sets up one end of brake assembly and adjusting piece can adjust the length of extension relative to brake assembly, one end of connecting swing arm with adjusting piece abuts, and the other end of connecting swing arm is connected with oil cylinder subassembly, through adjusting the length of extension of adjusting piece, realizes the grip distance adjustment of brake assembly relative to hand change main part, and the utility model discloses adjusting the length of extension of adjusting piece, thereby realizes the grip distance adjustment of brake assembly relative to hand change main part, and thus, the adjustment process is simple, and it is not necessary complicated adjustment step. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme of the utility model embodiment, the following will be briefly introduced the drawing needed to be used in the embodiment description, and obviously, the following description in the drawing is some embodiments of the utility model, and for those skilled in the art, under the premise of not paying the creative labor, other drawings can also be obtained according to these drawings.

[0017] Figure 1 The structure diagram of a hand change provided by the utility model embodiment Figure 1 ;

[0018] Figure 2 The enlarged view of part A in Figure 1 ;

[0019] Figure 3 The sectional view of a hand change provided by the utility model embodiment Figure 1 ;

[0020] Figure 4 The enlarged view of part B in Figure 3 ;

[0021] Figure 5 The sectional view of a hand change provided by the utility model embodiment Figure 2 ;

[0022] Figure 6 The explosion view of a hand change provided by the utility model embodiment

[0023] Figure 7 The enlarged view of part C in Figure 6 ;

[0024] Figure 8 The structure diagram of a hand change provided by the utility model embodiment Figure 2 .

[0025] Explanation of the mark in the drawing:

[0026] 10, hand change main body;

[0027] 20, oil cylinder assembly;

[0028] 30, brake assembly; 31, brake lever; 32, brake main body; 321, brake frame; 3211, adjusting hole; 3212, brake adjusting shaft; 3213, third elastic member; 322, swing arm shaft; 323, first elastic member; 324, second elastic member; 325, bushing;

[0029] 40, connecting swing arm; 41, first swing arm through hole; 42, abutting part; 43, first connecting part; 431, second swing arm through hole; 44, second connecting part; 441, third swing arm through hole; 45, bearing ring; 46, bearing pin;

[0030] 50, adjusting member. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0032] It should be understood that the terms "comprising" and "including" as used in the specification and the appended claims indicate the presence of the recited features, integers, steps, operations, elements, and / or components but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0033] It should also be understood that the terms used in this specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the specification and the appended claims of the present application, the singular forms "a", "an" and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0034] It should be further understood that the term "and / or" as used in the specification and the appended claims of the present application means any combination of one or more of the associated listed items and all possible combinations thereof, and includes these combinations.

[0035] In combination Figures 1 to 5The utility model discloses an embodiment provides a hand change, including hand change main body 10, oil cylinder subassembly 20, brake assembly 30, connecting swing arm 40 and adjusting part 50, oil cylinder subassembly 20 sets up on hand change main body 10, and one end of brake assembly 30 and the middle part of connecting swing arm 40 are all rotationally connected on hand change main body 10, and adjusting part 50 sets up on one end of brake assembly 30 and adjusting part 50 can adjust the length of extension relative to brake assembly 30, and one end of connecting swing arm 40 is abutted with adjusting part 50, and the other end of connecting swing arm 40 is connected with oil cylinder subassembly 20, the length of extension of adjusting part 50 is adjusted to realize the grip distance adjustment of brake assembly 30 relative to hand change main body 10.

[0036] In the embodiment, the oil cylinder subassembly 20 is arranged on the hand change main body 10, and is used for providing hydraulic braking action; one end of the brake assembly 30 and the middle part of the connecting swing arm 40 are pivotally connected to the hand change main body 10, so that the brake assembly 30 can rotate around the pivot shaft to realize braking operation. The adjusting part 50 is arranged at one end of the brake assembly 30 and can adjust the length of extension of the adjusting part 50 relative to the brake assembly 30 along the axial direction of the adjusting part 50. Specifically, the length of extension of the adjusting part 50 can be changed by rotating the adjusting part 50. One end of the connecting swing arm 40 abuts against the adjusting part 50, and the other end of the connecting swing arm 40 is connected to the oil cylinder subassembly 20, so as to form a force transmission mechanism.

[0037] Further, the contact position of the adjusting part 50 and the connecting swing arm 40 can be changed by rotating the adjusting part 50, and then the angle of the brake assembly 30 relative to the hand change main body 10 is adjusted. Increasing the length of extension of the adjusting part 50 makes the adjusting part 50 extend towards the connecting swing arm 40, so that the brake assembly 30 deflects inwardly relative to the hand change main body 10 (that is, the end of the brake assembly 30 close to the hand change main body 10 rotates around the connecting swing arm 40 to the direction close to the hand change main body 10), and the grip distance increases. Conversely, decreasing the length of extension of the adjusting part 50 makes the adjusting part 50 extend away from the connecting swing arm 40, so that the brake assembly 30 deflects outwardly relative to the hand change main body 10 (that is, the end of the brake assembly 30 close to the hand change main body 10 rotates around the connecting swing arm 40 to the direction away from the hand change main body 10), and the grip distance decreases. In the embodiment, the angle of the brake assembly 30 is finely adjusted by the adjusting part 50 to adapt to the needs of users with different palm sizes, the adjusting mode is simple, the grip distance can be adjusted without disassembling the hand change assembly, and the use convenience and operation precision are improved.

[0038] Specifically, the initial position of the connecting swing arm 40 remains unchanged, when the adjusting part 50 is rotated out or rotated in, the angle of the brake assembly 30 can be changed, and then the adjustment of the grip distance is realized, and the threshold value of the adjusting state can be divided into the following two cases:

[0039] The first kind: the maximum grip distance state (such as 90mm)

[0040] In the initial state, the adjusting member 50 is in the position of completely lifting the connecting arm 40, at this time, the adjusting member 50 extends 2.5mm in length, so that the brake assembly 30 is close to the hand change body 10, and the maximum grip distance is achieved. One side of the brake assembly 30 is in contact with or close to the hand change body 10 but not in contact, and the initial position of the brake point of the brake assembly 30 corresponds to a grip distance of 90mm (suitable for adult palm grip distance).

[0041] Second: minimum grip distance state (such as 70mm)

[0042] When the adjusting member 50 is rotated out to completely lift the connecting arm 40 (that is, the adjusting member 50 extends 0mm in length), the connecting arm 40 remains unchanged in the initial position under the action of the oil pressure of the oil cylinder assembly 20. The distance from the adjusting member 50 to the rotation point of the connecting arm 40 is about 10.72mm, and the distance from the brake point to the rotation point is about 100mm. According to the principle of similar triangles (see Figure 3 the schematic), the height difference of 2.5mm in the extension length of the adjusting member 50 is converted into the rotation angle (13.45°) of the brake assembly 30, which in turn causes the moving distance of the brake point to be 23.58mm. Thus, the grip distance gradually decreases from 90mm to 70mm, which is suitable for users with smaller palms.

[0043] In combination with Figure 6 and Figure 7 shown, in an embodiment, the brake assembly 30 includes a brake lever 31 and a brake body 32, the brake body 32 includes a brake frame 321, an arm shaft 322, a first elastic member 323 for resetting the brake lever 31, and a second elastic member 324 for keeping the connecting arm 40 close to the adjusting member 50, the brake lever 31 is connected with the brake frame 321, the arm shaft 322 is arranged on the brake frame 321, and the brake frame 321 and the connecting arm 40 are pivoted around the arm shaft 322, and the first elastic member 323 and the second elastic member 324 are respectively sleeved on the arm shaft 322.

[0044] Further, the brake body 32 further includes a bushing 325, one end of the connecting arm 40 is provided with a first arm through hole 41, the arm shaft 322 passes through the first arm through hole 41 and is sequentially connected with the brake frame 321 and the hand change body 10 at both ends, the bushing 325 is sleeved on the arm shaft 322, the first elastic member 323 and the second elastic member 324 are respectively sleeved on the bushing 325, one end of the first elastic member 323 is connected with the brake frame 321, and the other end is connected with the hand change body 10; one end of the second elastic member 324 is connected with one end of the connecting arm 40, and the other end is connected with the brake body 32.

[0045] In the embodiment, the brake lever 31 is connected with the brake frame 321, so that the brake lever 31 can drive the brake frame 321 to swing. One end of the connecting arm 40 is provided with a first arm through hole 41 for accommodating the arm shaft 322. The arm shaft 322 passes through the first arm through hole 41 in sequence and is connected with the brake frame 321 and the hand change main body 10 at both ends respectively, so as to form a rotation fulcrum, so that the connecting arm 40 can swing to adjust the angle within a limited range. In order to reduce the rotation friction and improve the rotation accuracy, the bushing 325 is sleeved on the arm shaft 322, and sliding support is provided, so that the connecting arm 40 and the brake assembly 30 are more smooth in the rotation process. In addition, in order to ensure that the brake lever 31 can return after adjustment or brake release, the first elastic member 323 (brake assembly retaining spring) and the second elastic member 324 (connecting arm retaining spring) are arranged in the embodiment, which are sleeved on the bushing 325 and located on both sides of the first arm through hole 41 to provide return elastic force. One end of the first elastic member 323 is connected with the brake frame 321, and the other end is connected with the hand change main body 10, which provides the return force, so that the brake lever 31 can quickly return when the brake is released, and the brake response speed and safety are improved. One end of the second elastic member 324 is connected with the connecting arm 40, and the other end is connected with the brake main body 32, which ensures that the connecting arm 40 always contacts with the adjusting member 50 and provides support force in the adjustment process, so that the grip distance adjustment is more stable and reliable. Because the connecting arm 40 is affected by the oil cylinder assembly 20 (i.e. the oil pressure in the oil cylinder assembly 20), when the force acting on the connecting arm 40 is less than a certain value, the connecting arm 40 is considered to be immovable, and the second elastic member 324 (connecting arm retaining spring) between the connecting arm 40 and the brake lever 31 always has a tendency to approach each other, so that the brake lever 31 will rotate when the adjusting member 50 is adjusted.

[0046] In an embodiment, one end of the connecting arm 40 extends to the abutting portion 42, and the brake frame 321 is provided with an adjusting hole 3211 for at least partially accommodating the adjusting member 50. One end of the adjusting member 50 is connected in the adjusting hole 3211, and the other end abuts on the abutting portion 42. The adjusting member 50 and the oil cylinder assembly 20 are located on the same side of the connecting arm 40. The adjusting member 50 adjusts the extension length through the adjusting hole 3211, and drives the brake assembly 30 to approach or move away from the hand change main body 10.

[0047] In the embodiment, one end of the connecting arm 40 extends to form an abutting portion 42 for contacting the adjusting member 50. The adjusting member 50 abuts against the abutting portion 42 and adjusts the grip distance position of the brake assembly 30 relative to the hand change main body 10 by adjusting the extension length thereof. To ensure that the adjusting member 50 has stable guiding support during the adjustment, the adjusting hole 3211 is formed in the brake frame 321 for accommodating the adjusting member 50. The adjusting member 50 extends through the adjusting hole 3211 and can be adjusted in the axial direction thereof, so that the displacement amount of the brake assembly 30 can be controlled, ensuring the accuracy and controllability of the grip distance adjustment. In addition, in the embodiment, the adjusting member 50 and the oil cylinder assembly 20 are located on the same side of the connecting arm 40, which optimizes the overall layout, so that the grip distance adjustment mechanism and the oil cylinder assembly 20 are arranged compactly and do not interfere with other components, and the adjustment operation is facilitated.

[0048] In the specific use, the user can rotate the adjusting member 50 to change the extension length thereof in the adjusting hole 3211 (i.e., the adjusting hole 3211 can partially accommodate the adjusting member 50 or can fully accommodate the adjusting member 50). When the extension length of the adjusting member 50 increases, the abutting portion 42 abutting against the adjusting member 50 moves away from the adjusting member 50, thereby driving the brake assembly 30 to rotate around the arm shaft 322, so that the brake lever 31 rotates around the arm shaft 322 away from the end of the hand change main body 10, and the grip distance increases. Conversely, when the extension length of the adjusting member 50 decreases, the abutting portion 42 remains stationary, and the end of the brake lever 31 away from the hand change main body 10 rotates around the arm shaft 322 toward the hand change main body 10, and the grip distance decreases.

[0049] In an embodiment, the adjusting member 50 is an adjusting screw, and the adjusting hole 3211 is a threaded hole.

[0050] In the embodiment, the adjusting member 50 is in the form of an adjusting screw. The adjusting hole 3211 in the brake frame 321 is a threaded hole, which can cooperate with the adjusting member 50, so that the adjustment process is smoother and has higher fine adjustment accuracy. The adjusting member 50 is installed in the threaded hole by a threaded connection, and the end thereof abuts against the abutting portion 42 of the connecting arm 40. The user can rotate the adjusting member 50 to adjust the extension length thereof in the axial direction by using the threaded transmission principle. When the adjusting member 50 rotates clockwise, the extension length thereof increases, and the brake frame 321 is pushed to move outward. When the adjusting member 50 rotates counterclockwise, the extension length thereof decreases, and the brake frame 321 moves inward.

[0051] In combination Figure 8As shown, in an embodiment, the brake frame 321 is provided with a brake adjusting shaft 3212 and a third elastic member 3213, one end of the brake lever 31 is sleeved on the third elastic member 3213 on the brake adjusting shaft 3212, the brake lever 31 can rotate around the brake adjusting shaft 3212 to form an avoiding space, the adjusting member 50 is located in the avoiding space, one end of the third elastic member 3213 is connected with the brake lever 31, and the other end is connected with the brake frame 321 to reset the brake lever 31.

[0052] In the embodiment, one end of the brake lever 31 is sleeved on the third elastic member 3213 on the brake adjusting shaft 3212, so that the brake lever 31 can be adjusted by rotating around the brake adjusting shaft 3212 to form an avoiding space. Specifically, the third elastic member 3213 is first sleeved on the brake adjusting shaft 3212, and one end of the brake lever 31 is then sleeved on the third elastic member 3213. When fine adjustment is needed, the brake lever 31 is pushed outward to see the adjusting member 50, and the corresponding fine adjustment tool can be used to complete the fine adjustment of the holding distance. The third elastic member 3213 provided in the embodiment is used to provide a reset elastic force. When the fine adjustment is completed, the third elastic member 3213 can generate an elastic recovery force to quickly restore the brake lever 31 to the initial position. In addition, the top of the brake frame 321 is also provided with a protective part, which can cover the brake adjusting shaft 3212 and play a protective role with the brake lever 31 in actual use. The other end of the brake lever 31 is provided with a shock-absorbing block and a brake lever protective cover, which can better protect the brake lever 31 when riding.

[0053] In an embodiment, the other end of the connecting arm 40 is provided with a first connecting part 43 and a second connecting part 44, the first connecting part 43 and the second connecting part 44 are spaced apart, the first connecting part 43 is provided with a second connecting arm through hole 431, and the second connecting part 44 is provided with a third connecting arm through hole 441, a bearing ring 45 and a bearing pin 46 are arranged between the first connecting part 43 and the second connecting part 44, the bearing ring 45 is clamped between the second connecting arm through hole 431 and the third connecting arm through hole 441, the bearing pin 46 passes through the second connecting arm through hole 431, the third connecting arm through hole 441 and the bearing ring 45 at the same time, and the bearing ring 45 abuts against one end of the oil cylinder assembly 20.

[0054] In the embodiment, the bearing ring 45 is clamped between the second rotating arm through hole 431 and the third rotating arm through hole 441, and the bearing pin 46 passes through the second rotating arm through hole 431, the third rotating arm through hole 441 and the bearing ring 45 to form an integrated rotating connection structure. This design can effectively reduce the rotating friction, improve the durability of the connecting assembly, and ensure that the connecting rotating arm 40 can rotate smoothly during the braking operation or the grip distance adjustment. In addition, the outer surface of the bearing ring 45 abuts against one end of the oil cylinder assembly 20 to realize stable contact with the oil cylinder push rod. When the oil cylinder assembly 20 applies a braking force, the force can be transmitted through the bearing pin 46 and the connecting rotating arm 40 to ensure the normal operation of the brake system. This structure not only enhances the stability of the overall connection, but also effectively reduces the friction loss between rotating parts, improves the service life and mechanical response efficiency of the system.

[0055] In an embodiment, the extension length of the adjusting member 50 is positively correlated with the grip distance.

[0056] In the embodiment, the extension length of the adjusting member 50 is positively correlated with the grip distance of the brake assembly 30 relative to the hand variable body 10, that is, by increasing the extension length of the adjusting member 50, the grip distance can be increased, and vice versa, the extension length of the adjusting member 50 is reduced, and the grip distance is correspondingly reduced.

[0057] In an embodiment, the maximum grip distance of the brake assembly 30 relative to the hand variable body 10 is less than or equal to 90mm.

[0058] In the embodiment, the adjustment of the grip distance is controlled by the adjusting member 50, and the extension length thereof determines the swing range of the brake assembly 30. When the adjusting member 50 is in the maximum extension state, the angle of the brake assembly 30 relative to the hand variable body 10 reaches the limit, and at this time, the grip distance is maximum. Based on the structural design and the principle of similar triangles, when the adjusting member 50 completely lifts the connecting rotating arm 40, the maximum grip distance is controlled to be within 90mm, that is, the grip distance is less than or equal to 90mm.

[0059] In an embodiment, the maximum included angle of the brake assembly 30 relative to the hand variable body 10 is greater than or equal to 33°.

[0060] In the embodiment, when the adjusting member 50 is in the maximum extension state, it lifts the connecting rotating arm 40, so that the brake assembly 30 approaches the hand variable body 10, and at this time, the rotation angle of the brake assembly 30 reaches the maximum. Through mechanical calculation, under the condition of the maximum grip distance (less than or equal to 90mm), the maximum included angle of the brake assembly 30 relative to the hand variable body 10 is limited to be greater than or equal to 33°, so as to ensure that the brake assembly 30 still has sufficient braking stroke when it is completely gripped, and avoid the situation that the brake stroke is insufficient due to the too small included angle.

[0061] The utility model also provides a kind of electric power-assisted bicycle, including hand variable as described above.

[0062] In the embodiment, the electrically assisted bicycle comprises a frame and a hand variable. The hand variable is integrated on the frame as the core component of the electrically assisted bicycle, and is used for controlling the speed change and brake operation.

[0063] In summary, the angle adjustment of the brake assembly 30 is controlled by adjusting the adjusting piece 50 to realize the fine adjustment of the hand variable grip distance to adapt to the palm size requirements of different users. Compared with the prior art, the utility model has the following beneficial effects: first, simple structure, convenient adjustment. The screw thread adjustment principle is used to make the grip distance adjustment process without disassembling any parts, and the user can directly adjust the grip distance by rotating the adjusting screw, improving the operation convenience and practicality. Second, the adjustment range is wide, and the crowd is extensive. The structure can realize linear adjustment between 70mm and 90mm, and is suitable for riders of different age groups and different palm sizes, improving the use comfort. In addition, the adjustment process is stable, and the brake stroke is avoided. By reasonably setting the brake termination angle to 33°, at least 20° of effective brake stroke is still reserved even in the minimum grip distance (70mm) state, effectively preventing the brake lever 31 from being too close to the handlebar belt or squeezing the fingers, improving the safety and reliability of the brake system. At the same time, the mechanical structure is optimized, and the durability is improved.

[0064] The above is only a specific embodiment of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the technical field can easily think of various equivalent modifications or replacements within the technical range disclosed by the utility model, and these modifications or replacements should be covered in the protection scope of the utility model. Therefore, the protection scope of the utility model should be subject to the protection scope of the claims.

Claims

1. A hand, characterized in that, The hand change main body, the oil cylinder assembly, the brake assembly, the connecting swing arm and the adjusting piece are included, the oil cylinder assembly is arranged on the hand change main body, one end of the brake assembly and the middle part of the connecting swing arm are rotationally connected to the hand change main body, the adjusting piece is arranged on one end of the brake assembly and the adjusting piece can adjust the extension length relative to the brake assembly, one end of the connecting swing arm abuts against the adjusting piece, and the other end of the connecting swing arm is connected to the oil cylinder assembly; the hand distance adjustment of the brake assembly relative to the hand change main body is realized by adjusting the extension length of the adjusting piece.

2. The hand according to claim 1, wherein The brake assembly includes a brake lever and a brake main body, the brake main body includes a brake frame, a swing arm shaft, a first elastic piece for resetting the brake lever and a second elastic piece for keeping the connecting swing arm abutting against the adjusting piece, the brake lever is connected to the brake frame, the swing arm shaft is arranged on the brake frame and the brake frame and the connecting swing arm pivot around the swing arm shaft, and the first elastic piece and the second elastic piece are respectively correspondingly sleeved on the swing arm shaft.

3. The hand of claim 2, wherein, The brake main body further includes a bushing, one end of the connecting swing arm is provided with a first swing arm through hole, the swing arm shaft passes through the first swing arm through hole and both ends of the swing arm shaft are sequentially connected to the brake frame and the hand change main body, the bushing is sleeved on the swing arm shaft, the first elastic piece and the second elastic piece are respectively sleeved on the bushing, one end of the first elastic piece is connected to the brake frame and the other end is connected to the hand change main body; one end of the second elastic piece is connected to one end of the connecting swing arm and the other end is connected to the brake main body.

4. The hand of claim 2, wherein, One end of the connecting swing arm extends to a resisting part, the brake frame is provided with an adjusting hole for at least partially accommodating the adjusting piece, one end of the adjusting piece is connected to the adjusting hole and the other end abuts against the resisting part, the adjusting piece and the oil cylinder assembly are located on the same side of the connecting swing arm, the extension length of the adjusting piece is adjusted through the adjusting hole, and the brake assembly is driven to be close to or away from the hand change main body.

5. The hand of claim 4, wherein, The adjusting piece is an adjusting screw and the adjusting hole is a threaded hole.

6. The hand of claim 2 wherein, The brake frame is provided with a brake adjusting shaft and a third elastic piece, one end of the brake lever is sleeved on the brake adjusting shaft with the third elastic piece, the brake lever can rotate around the brake adjusting shaft to form an avoiding space, the adjusting piece is located in the avoiding space, one end of the third elastic piece is connected to the brake lever and the other end is connected to the brake frame to reset the brake lever.

7. The hand variant of claim 1, wherein, The other end of the connecting swing arm is provided with a first connecting part and a second connecting part, the first connecting part and the second connecting part are spaced apart, the first connecting part is provided with a second swing arm through hole and the second connecting part is provided with a third swing arm through hole, a bearing ring and a bearing pin are arranged between the first connecting part and the second connecting part, the bearing ring is clamped between the second swing arm through hole and the third swing arm through hole, the bearing pin passes through the second swing arm through hole, the third swing arm through hole and the bearing ring at the same time, and the bearing ring abuts against one end of the oil cylinder assembly.

8. The hand of claim 1 wherein, The extension length of the adjusting piece is positively correlated with the hand distance.

9. The hand variant of claim 1, wherein, The maximum grip distance of the brake assembly relative to the hand variation body is less than or equal to 90 mm.

10. The hand according to claim 1, wherein The maximum included angle of the brake assembly relative to the hand variation body is greater than or equal to 33°.

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