Impact-resistant bicycle variable-speed main shaft subjected to carburizing step quenching treatment

Abstract

The utility model provides an anti-impact bicycle variable-speed main shaft subjected to carburizing step quenching treatment, and belongs to the technical field of bicycle equipment. Comprising a spindle body; the key groove is formed in the main shaft body, and the key groove is used for providing an installation position of a key; the screw rod is rotationally arranged in the main shaft body, and the center line of the screw rod in the length direction coincides with the center line of the main shaft body in the length direction; and the supporting sleeve is arranged in the main shaft body in a sliding manner, and the supporting sleeve is in threaded connection with the screw rod. Through cooperation of the key groove, the screw rod, the supporting sleeve, the sliding block, the inclined block, the auxiliary block, the positioning block and other structures, the bicycle speed change main shaft can be disassembled conveniently and efficiently, and by means of the synergistic effect of the spring, the positioning block, the auxiliary block, the inclined block, the sliding block and other structures, the purpose that the screw rod is prevented from rotating accidentally when the main shaft body works is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a bicycle equipment technical field, especially to a shock resistance bicycle speed change main shaft of carburizing grading quenching treatment. BACKGROUND

[0002] As a widely used means of transportation and fitness equipment, the bicycle's gear system is crucial to the riding experience. The bicycle speed change main shaft is one of the core components in the gear system, which connects multiple key components to ensure the power can be effectively transmitted between different gears, thus achieving different riding speeds. With the continuous development of bicycle technology, the performance requirements of the speed change main shaft are also increasing, including strength, impact resistance, and service life.

[0003] However, the existing bicycle speed change main shaft is mostly fixed to the wheel by a key when installed into the wheel. This installation method can ensure the synchronization of the main shaft with related components during operation, but it brings great inconvenience when the main shaft needs to be disassembled, maintained, or replaced. Due to the close fit of the key and the keyway, a lot of time and effort are often needed to separate the connection of the key and the keyway when disassembling the main shaft, and it is easy to cause damage to the main shaft or other components due to improper force during operation, which not only increases the maintenance cost but also reduces the maintenance efficiency. SUMMARY

[0004] The technical problem to be solved by the utility model is to provide a shock resistance bicycle speed change main shaft of carburizing grading quenching treatment to solve the technical problems of complex operation, time-consuming and laborious, easy to cause damage to components during disassembly of the existing bicycle speed change main shaft, and accidental rotation of the screw during operation of the main shaft body, resulting in loose connection between the main shaft body and the wheel.

[0005] Technical solution: To achieve the above object, the utility model discloses a kind of impact-resistant bicycle derailleur main shaft of carburizing graded quenching, comprising: main shaft body;Keyway, be opened in main shaft body, keyway is used to provide the installation position of key;Screw rod, rotation is arranged in main shaft body, the long direction center line of screw rod coincides with the long direction center line of main shaft body;Support sleeve, sliding is arranged in main shaft body, support sleeve is threadedly connected with screw rod, support sleeve is used to control the extension and retraction of key in keyway, so that key at least partially protrudes keyway, or completely retracts into keyway, to complete or release the circumferential fixation between main shaft body and wheel, wherein the rotation connection of screw rod and main shaft body adopts adapted structure, ensure flexible and smooth rotation, coincidence degree of the center line of both is strictly calibrated, to maintain the stable operation and accurate control of entire mechanism;The screw thread connection design of support sleeve and screw rod is reasonable, and thread tooth type has good self-locking performance and transmission efficiency, so that support sleeve can accurately slide under the drive of screw rod, so that the position of key in keyway can be reliably regulated and controlled, and effective switching of the circumferential fixation state of main shaft body and wheel is realized.

[0006] In further embodiment, control groove, be opened in screw rod, control groove is set as hexagonal recess, control groove is used to provide hex key insertion position, wherein the processing of control groove should adopt precision machining process, ensure that its shape accuracy and dimensional accuracy meet standard requirements, the internal angle of groove should be clear, regular, without burr and deformation, and its depth and width should be well adapted with hex key, ensure that wrench does not appear skid or jam phenomenon in operating process.

[0007] In further embodiment, auxiliary block, at least one is provided, auxiliary block is slidably connected in screw rod;Positioning block, at least one is provided, one end of positioning block is connected with auxiliary block, and the other end is detachably connected with the main shaft body with the screw rod, wherein the detachable connection mode of positioning block and main shaft body is designed convenient and reliable, such as using easy-to-operate threaded connection or quick-release structure, which can facilitate the operation of positioning block during installation and disassembly, and can ensure that positioning block is firmly fixed on main shaft body under normal working condition, effectively prevent screw rod from accidental rotation, and guarantee the stability of circumferential fixation between main shaft body and wheel.

[0008] In a further embodiment, the slider is slidingly connected in the screw, the slider is provided with a pressing block on one side close to the control groove, one end of the pressing block is connected with the slider, and the other end is in the control groove; the inclined block is stably connected with one end of the slider and slidingly connected with the other end in the auxiliary block, and the inclined block is used for controlling the auxiliary block to slide in the main shaft body, wherein the pressing block on the slider is firmly connected with the slider, the shape and size of the pressing block are accurately matched with the control groove, the operation force applied by the inner hex wrench can be efficiently transmitted to the slider, so that the linkage action of the whole mechanism is driven, and accurate control of the circumferential fixing state of the main shaft body and the wheel is realized; the connection between the inclined block and the slider adopts a reliable rigid connection mode such as welding or high-strength bolt connection, and is subjected to strength checking, so that loosening or fracture of the connection part does not occur in the stress process, and stable transmission of force is ensured. The sliding connection between the inclined block and the auxiliary block adopts a material or surface treatment process with low friction coefficient, so that the inclined block can smoothly push the auxiliary block to slide, and accurate control function is realized.

[0009] In a further embodiment, the spring is arranged in the screw, one end of the spring is connected with the screw, and the other end is connected with the slider, and the spring is used for resetting the slider, wherein the two ends of the spring are connected with the screw and the slider in a suitable connection mode such as reliable hook or threaded connection, so as to prevent the spring from falling off, shifting or deforming during work, and ensure normal work of the spring and stable transmission of force.

[0010] In a further embodiment, the main shaft body is made of 20CrMo steel, and the main shaft body is subjected to fine grain treatment; and a carburizing and grading quenching process is adopted to control the core hardness and surface hardness, so that better strength and toughness are matched, that is, the surface hardness is 45-52HRC, the core hardness is 30-35HRC, the gear hardness is 600-650HV1, and the effective hardening layer depth is 0.3-0.4mm.

[0011] In a further embodiment, the support sleeve is provided with a limiting block for limiting the rotation of the support sleeve with the screw, wherein the connection between the limiting block and the support sleeve adopts a firm and reliable mode such as welding or high-strength bolt connection, and is subjected to strength checking and reliability verification, so that the limiting block does not fall off, loosen or be damaged during work, and the limiting block can stably play a limiting role for a long time.

[0012] Beneficial effects: 1. Through the cooperation of keyway, screw rod, support sleeve, sliding block, inclined block, auxiliary block and positioning block, the convenient and efficient disassembly of bicycle variable speed spindle is realized, and the effects of significantly improving maintenance efficiency and reducing part damage risk are achieved. The keyway provides a stable installation basis for the key, and its structural design is conducive to the movement of the key during disassembly. As the core control component, the screw rod is rotationally connected with the main shaft body and threadedly connected with the support sleeve, so that the operating force can be accurately transmitted and converted. When the internal hexagonal wrench is inserted into the control groove of the screw rod and an external force is applied, the sliding block slides in the screw rod, the pressing block on the sliding block transmits the force to the inclined block, the inclined block in turn drives the auxiliary block to slide in the screw rod, drives the positioning block to retract into the screw rod, and releases the fixation of the screw rod and the main shaft body. At the same time, the support sleeve slides under the thread drive of the screw rod, so that the key in the keyway can be completely immersed in the keyway, and the disassembly of the main shaft body is easily realized.

[0013] 2. With the synergistic effect of spring, positioning block, auxiliary block, inclined block and sliding block, the purpose of avoiding accidental rotation of the screw rod when the main shaft body is working is achieved, and the effect of ensuring stable and reliable connection between the main shaft body and the wheel is achieved. One end of the spring is connected with the screw rod, and the other end is connected with the sliding block. In the normal working state, the spring force makes the sliding block in a stable position, thereby driving the inclined block, auxiliary block and positioning block to maintain the corresponding positions. One end of the positioning block is connected with the auxiliary block, and the other end penetrates the screw rod and is detachably connected with the main shaft body. This connection mode enables the positioning block to be accurately inserted into the positioning hole of the main shaft body, effectively limiting the rotational freedom of the screw rod. Even if the bicycle is subjected to vibration, impact or other external force interference during operation, the close cooperation between the components and the continuous spring force provided by the spring can ensure that the positioning block always stably plays the role of preventing the screw rod from rotating, ensuring the firm and reliable circumferential fixation between the main shaft body and the wheel, and avoiding the purpose of connection loosening caused by accidental rotation of the screw rod. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creating any inventive labor.

[0015] Figure 1 It is a structural schematic diagram of the present application.

[0016] Figure 2 It is a structural schematic diagram of the keyway.

[0017] Figure 3 It is a structural schematic diagram of the support sleeve.

[0018] Figure 4 for Figure 3 a sectional view structure schematic diagram.

[0019] Figure 5 for Figure 2 structure schematic diagram at A.

[0020] The reference signs in the drawings are: 1, main shaft body; 101, keyway; 2, screw rod; 201, control groove; 3, support sleeve; 4, sliding block; 5, inclined block; 6, auxiliary block; 601, positioning block; 7, spring. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the utility model clearer, the technical scheme in the utility model is described clearly and completely, obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0022] The application provides an impact-resistant bicycle variable-speed main shaft treated by carburizing and grading quenching, which solves the technical problems that the existing bicycle variable-speed main shaft is complex to operate, time-consuming and labor-consuming, and easy to cause damage to parts during disassembly, and the screw rod is accidentally rotated when the main shaft body works, so that the connection between the main shaft body and the wheel is loosened. In actual use, the bicycle variable-speed main shaft is conveniently and efficiently disassembled, and the purpose of avoiding accidental rotation of the screw rod when the main shaft body works is achieved.

[0023] In order to better understand the above technical scheme, the above technical scheme will be described in detail in combination with the drawings of the specification and specific embodiments.

[0024] With reference to Figures 1-5 A bicycle variable-speed main shaft treated by carburizing and grading quenching, comprising: a main shaft body 1; a keyway 101, which is arranged on the main shaft body 1 and is used to provide a mounting position of a key; a screw rod 2, which is rotationally arranged in the main shaft body 1 and whose long-direction center line coincides with the long-direction center line of the main shaft body 1; and a support sleeve 3, which is slidingly arranged in the main shaft body 1 and is threadedly connected with the screw rod 2, and is used to control the extension and retraction of the key in the keyway 101, so that the key at least partially protrudes from the keyway 101 or is completely retracted into the keyway 101, thereby completing or releasing the circumferential fixation between the main shaft body 1 and the wheel.

[0025] The key is provided with a mounting position by the key groove 101, and the rotation and sliding connection of the screw rod 2 and the supporting sleeve 3 is matched, so that the effective control of the circumferential fixation between the main shaft body 1 and the wheel is realized. The key can be extended or retracted in the key groove 101 as needed, so that the connection of the main shaft and the wheel is flexibly completed or released, the operation requirements of the bicycle speed change system under different working conditions are met, the stability and reliability of power transmission are ensured, and the foundation conditions for the subsequent possible disassembly and maintenance work are provided, so that the installation, use and maintenance of the whole speed change main shaft are more convenient and efficient.

[0026] The control groove 201 is arranged on the screw rod 2, and the control groove 201 is arranged as a hexagonal groove, and the control groove 201 is used to provide a hexagonal wrench insertion position.

[0027] The control groove 201 is arranged as a hexagonal groove, which provides an accurate and stable insertion position for the hexagonal wrench; this enables the operator to conveniently operate the screw rod 2 using a common hexagonal wrench, thereby realizing the control of the whole speed change main shaft connection structure. This standardized design improves the convenience and universality of operation.

[0028] The auxiliary block 6 is at least provided with one, and the auxiliary block 6 is slidably connected in the screw rod 2; the positioning block 601 is at least provided with one, and one end of the positioning block 601 is connected with the auxiliary block 6, and the other end is connected with the main shaft body 1 through the screw rod 2.

[0029] The sliding connection of the auxiliary block 6 in the screw rod 2 and the connection with the positioning block 601, in cooperation with the detachable connection of the positioning block 601 and the main shaft body 1, realize the accurate restriction and positioning function of the rotation of the screw rod 2; when the main shaft body 1 works, the accidental rotation of the screw rod 2 can be effectively prevented, so as to ensure that the connection between the main shaft body 1 and the wheel is always stable and reliable, and avoid the problems of power transmission interruption or instability caused by the loosening of the screw rod 2.

[0030] The sliding block 4 is slidably connected in the screw rod 2, and one side of the sliding block 4 close to the control groove 201 is provided with a pressing block, and one end of the pressing block is connected with the sliding block 4 and the other end is in the control groove 201; the inclined block 5 is stably connected with one end of the sliding block 4 and slidably connected with the other end in the auxiliary block 6, and the inclined block 5 is used to control the sliding of the auxiliary block 6 in the main shaft body 1.

[0031] The sliding of the sliding block 4 in the screw rod 2 and the cooperation of the pressing block and the control groove 201 can effectively transmit the operating force applied by the hexagonal wrench outside to the inclined block 5, and the inclined block 5 controls the sliding of the auxiliary block 6 in the main shaft body 1, so as to realize the transmission and conversion of force, and convert the simple wrench operation into the coordinated action of multiple components.

[0032] A spring 7 is arranged in the screw rod 2, one end of the spring 7 is connected with the screw rod 2, the other end is connected with the sliding block 4, and the spring 7 is used for resetting the sliding block 4.

[0033] The spring 7 is arranged in the screw rod 2 and connected with the screw rod 2 and the sliding block 4, so that the automatic resetting function of the sliding block 4 is realized; after completing the operation on the variable speed spindle once, the spring 7 can pull the sliding block 4 back to the initial position by using the elastic restoring force, so as to prepare for the next operation.

[0034] The spindle body 1 is made of 20CrMo steel.

[0035] The 20CrMo steel is used as the material of the spindle body 1, the material has good toughness, and is subjected to carburizing and grading quenching treatment, so that the comprehensive performance of the spindle body 1 is improved in high strength, high toughness and good wear resistance. In the running process of the bicycle variable speed system, the spindle body 1 can withstand complex stresses from all directions, such as torque, impact force and friction force, and will not easily deform, break or wear, so as to ensure the stable operation and long service life of the variable speed system.

[0036] The supporting sleeve 3 is provided with a limiting block for limiting the rotation of the supporting sleeve 3 with the screw rod 2.

[0037] The limiting block is arranged on the supporting sleeve 3, so that the rotation freedom of the supporting sleeve 3 is effectively limited, and it is ensured that the supporting sleeve 3 can only slide linearly under the driving of the screw rod 2; this ensures that the control of the supporting sleeve 3 on the key is more accurate and stable, avoids the position of the key in the key groove 101 from being out of control due to the accidental rotation of the supporting sleeve 3, and thus ensures the reliability and stability of the circumferential fixation between the spindle body 1 and the wheel.

[0038] In use, the main shaft body 1 as a core component undertakes the key role of power transmission, the key groove 101 provides a stable mounting position for the key, ensures the circumferential fixed connection between the wheel, and enables the power to be effectively transmitted; when the variable speed main shaft needs to be operated, for example, disassembled, the operator inserts the inner hexagonal wrench into the hexagonal control groove 201 on the screw rod 2, and extrudes the pressing block on the side of the sliding block 4 close to the control groove 201, the pressing block transmits the force to the sliding block 4, so that the sliding block 4 slides in the screw rod 2; the sliding of the sliding block 4 drives the inclined block 5 connected therewith to move, the other end of the inclined block 5 is slidably connected in the auxiliary block 6, thereby pushing the auxiliary block 6 to slide in the main shaft body 1; the sliding of the auxiliary block 6 drives the positioning block 601 to move, one end of the positioning block 601 is connected with the auxiliary block 6, and the other end penetrates the screw rod 2 and is detachably connected with the main shaft body 1, at this time, the positioning block 601 is retracted into the screw rod 2, and the specific fixed state of the screw rod 2 and the main shaft body 1 is released; at the same time, since the screw rod 2 is threadedly connected with the supporting sleeve 3, the rotation of the screw rod 2 drives the supporting sleeve 3 to slide in the main shaft body 1, and the supporting sleeve 3 is used for controlling the extension and retraction of the key in the key groove 101, at this time, the sliding of the supporting sleeve 3 makes the key completely retract into the key groove 101, thereby completely releasing the circumferential fixation between the main shaft body 1 and the wheel, and facilitating the subsequent disassembly operation; when the main shaft body 1 is installed into the wheel, the screw rod 2 needs to be reversely rotated according to the same operation, so that the supporting sleeve 3 is reset, then the key is installed into the key groove 101, and then the main shaft body 1 can be installed into the wheel; and in the whole process, the spring 7 is arranged in the screw rod 2, one end of the spring 7 is connected with the screw rod 2, and the other end is connected with the sliding block 4, so that the spring 7 plays a role of resetting the sliding block 4, and after the operation is completed, the spring 7 uses the elastic force to pull the sliding block 4 back to the initial position, so as to prepare for the next operation.

[0039] The figure shown in the drawing is an example figure, and the purpose is only to more intuitively show the key structure and connection relationship of the impact-resistant bicycle variable speed main shaft subjected to carburizing and grading quenching; in actual application, the appearance and size of the device can be adjusted and optimized according to specific needs.

[0040] The utility model covers any alternative, modification, equivalent method and scheme made on the essence and range of the utility model. In order to enable the public to have a thorough understanding of the utility model, the specific details are explained in the above preferred embodiment of the utility model, and the utility model can also be completely understood without the description of these details for the person skilled in the art. In addition, in order to avoid unnecessary confusion to the essence of the utility model, the well-known methods, processes, flows, elements and circuits are not described in detail.

[0041] The above merely is preferred implementation manner of the present application, it should be pointed out, for ordinary skilled person in the technical field, on the premise of not departing from the principle of the present application, can also make several improvements and refinements, these improvements and refinements also should be regarded as the protection scope of the present application.

Claims

1. A shock resistant bicycle derailleur spindle treated by carburizing and marquenching, characterized in that, It includes: Main shaft body (1); Keyway (101), which is opened on the main shaft body (1), the keyway (101) is used to provide the installation position of the key; Screw rod (2), which is rotatably arranged in the main shaft body (1), the long direction center line of the screw rod (2) coincides with the long direction center line of the main shaft body (1); Support sleeve (3), which is slidably arranged in the main shaft body (1), the support sleeve (3) is threadedly connected with the screw rod (2), the support sleeve (3) is used to control the extension and retraction of the key in the keyway (101), so that the key at least partially protrudes from the keyway (101), or is completely retracted into the keyway (101), thereby completing or releasing the circumferential fixation between the main shaft body (1) and the wheel.

2. A shock absorbing bicycle derailleur spindle treated by carburizing and marquenching according to claim 1, characterized in that It also includes: Control groove (201), which is opened on the screw rod (2), the control groove (201) is provided as a hexagonal groove, the control groove (201) is used to provide an internal hexagonal wrench insertion position.

3. A shock absorbing bicycle derailleur spindle treated by carburizing and marquenching according to claim 2, characterized in that It also includes: Auxiliary block (6), at least one, the auxiliary block (6) is slidably connected in the screw rod (2); Positioning block (601), at least one, one end of the positioning block (601) is connected with the auxiliary block (6), and the other end is detachably connected with the main shaft body (1) penetrating the screw rod (2).

4. A shock absorbing bicycle derailleur spindle treated by carburizing and marquenching according to claim 3, characterized in that It also includes: Sliding block (4), which is slidably connected in the screw rod (2), one side of the sliding block (4) near the control groove (201) is provided with a pressing block, one end of the pressing block is connected with the sliding block (4), and the other end is in the control groove (201); Inclined block (5), one end of the inclined block (5) is stably connected with the sliding block (4), and the other end is slidably connected in the auxiliary block (6), the inclined block (5) is used to control the sliding of the auxiliary block (6) in the main shaft body (1).

5. A shock absorbing bicycle derailleur spindle treated by carburizing and marquenching according to claim 4, characterized in that It also includes: Spring (7), which is arranged in the screw rod (2), one end of the spring (7) is connected with the screw rod (2), and the other end is connected with the sliding block (4), the spring (7) is used for resetting the sliding block (4).

6. A shock absorbing bicycle derailleur spindle treated by carburizing and marquenching according to claim 1, characterized in that: The main shaft body (1) is made of 20CrMo steel.

7. A shock absorbing bicycle derailleur spindle for carburizing and marquenching treatment according to claim 1, characterized in that: The support sleeve (3) is provided with a limiting block for limiting the rotation of the support sleeve (3) with the screw rod (2).

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