Detachable crank

Abstract

The utility model relates to a detachable crank which comprises a shaft core, and a connecting device and a fixing device used in cooperation with the connecting device are arranged on the side face of the shaft core. The fixing device comprises a plurality of limiting grooves formed in the surface of the outer side of the shaft core, fixing bolts are arranged in the limiting grooves, a movably-connected shaft seat is arranged on the outer side of the shaft core, and a wheel disc is arranged on the outer side of the shaft seat. According to the detachable crank, the mounting rod is rotated, the threads of the mounting rod rotate on the inner side wall of the connecting shaft, then the mounting rod is taken down, the limiting rod is taken out from the interior of the connecting shaft in a sliding mode after the mounting rod is screwed down, the fixing bolt is rotated after the limiting rod is taken out, and the connecting shaft can be taken down after the fixing bolt is rotated down. After the connecting shaft is taken down, the limiting plate can be taken down together with the connecting shaft, the fixing bolt can be screwed after the limiting plate is taken down, the fixing bolt rotates in the fixing plate and the limiting groove to enable the fixing plate and the fixing bolt to be disassembled, the fixing bolt is pulled out of the limiting groove, the fixing plate is disassembled at the same time, and disassembly is completed.

Description

Technical Field

[0001] The utility model relates to the technical field of cranks, in particular to a detachable crank. Background Art

[0002] As a commonly used mechanical component, the crank has many uses. It can be used as an intermediate for power transmission to transmit the rotational motion of the engine to other mechanisms, such as gears, sprockets, pulleys, etc., to drive the operation of mechanical equipment. It can also convert rotational motion into reciprocating motion or vice versa, which can be achieved through crank-connecting rod mechanisms, cam mechanisms, etc. By changing the length or shape of the crank, the speed and direction of the rotational motion can be adjusted to meet different work requirements. As an auxiliary tool, for example, in transportation tools such as bicycles and motorcycles, the crank is used to connect the pedals and gears to convert the pedaling force of the person into the power to drive the vehicle forward. In addition, the crank can be used as an important component in mechanical design. For example, in engines, reducers, transmission devices and other machinery, the crank plays an important role.

[0003] The crank is an important component widely used in various mechanical equipment to achieve functions such as power transmission, motion conversion, speed and direction adjustment, etc. However, as a commonly used mechanical component, its installation process is usually an integrated structure or a simple distributed structure. During use, it is not convenient to maintain. When a failure occurs, it often needs to be replaced as a whole, which causes some waste of available materials. In addition, due to the single structure, some parts cannot be replaced according to actual needs to improve the working efficiency of the crank. Therefore, a detachable crank is proposed. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a detachable crank having the advantages of high flexibility and good stability, and solves the problems of the traditional crank having a single structure, inconvenient maintenance and low flexibility.

[0005] In order to achieve the above-mentioned purpose of high flexibility and good stability, the utility model provides the following technical solutions: a detachable crank, comprising an axis core, a connecting device and a fixing device used in conjunction with the connecting device are provided on the side of the axis core; the fixing device comprises a plurality of limiting grooves opened on the outer surface of the axis core, a fixing bolt is provided inside the limiting groove, a shaft seat with a movably connected is provided on the outer side of the axis core, a wheel is provided on the outer side of the shaft seat, a fixing plate is provided on the side of the axis core, a plurality of connecting grooves are opened inside the fixing plate, a fixing groove is opened on the side of the axis core, a fixing bolt with a movably connected is provided inside the fixing groove, a connecting shaft with a movably connected is provided on the outer side of the fixing bolt, a limiting plate is provided on the outer side of the connecting shaft, and a limiting rod is provided inside the connecting shaft.

[0006] Furthermore, the connecting device includes a fixing seat fixedly installed on the side of the fixing plate, a movable mounting seat a is provided on the outer side of the seat rod of the fixing seat, a movable mounting rod is provided on the inner side of the connecting shaft, and a movable mounting seat b is provided on the outer side of the mounting rod located outside the connecting shaft.

[0007] Furthermore, the side surface of the fixing bolt is slidably connected to the limiting groove, and the end of the fixing bolt is threadedly screwed into the connecting groove and fixedly installed with the fixing plate through threads.

[0008] Furthermore, the inner side wall of the shaft seat is provided with a plurality of grooves used to cooperate with fixing bolts, and the sides of the grooves are slidably connected to the fixing bolts, and the outer side of the shaft seat is fixedly installed to the wheel disc.

[0009] Furthermore, the interior of the connecting shaft is a hollow structure, the fixing bolt transversely passes through one side of the connecting shaft and is rotatably connected to the connecting shaft, the end of the fixing bolt is threaded into the fixing groove and the shaft core is fixedly installed by the thread.

[0010] Furthermore, a plurality of limiting slots for use with the fixing bolts are provided inside the limiting plate, and the shape of the limiting slots is similar to the shape of the nuts of the fixing bolts to limit the rotation of the fixing bolts.

[0011] Furthermore, the shape of the limiting rod is mutually adapted to the hollow structure of the connecting shaft and is slidably connected to the inner side wall of the connecting shaft, and the inner side wall of the connecting shaft is provided with threaded patterns.

[0012] Furthermore, a thread pattern is provided on the outside of the seat rod of the fixing seat, and the mounting seat a and the fixing seat are fixedly installed by means of threads.

[0013] Furthermore, the outer side of the mounting rod is provided with a thread, and the end of one side of the mounting rod is threadedly screwed into the interior of the connecting shaft and fixedly mounted with the connecting shaft thread, and the outer side of the mounting rod and the mounting seat b are fixedly mounted by threads.

[0014] Compared with the prior art, the utility model provides a detachable crank, which has the following beneficial effects:

[0015] 1. The detachable crank can be removed by rotating the mounting rod, and the thread of the mounting rod rotates on the inner wall of the connecting shaft, and then the mounting rod is removed. After the mounting rod is unscrewed, the limit rod is slid out from the inside of the connecting shaft, and after the limit rod is taken out, the fixing bolt is rotated again. After the fixing bolt is turned down, the connecting shaft can be removed, and the limit plate can be removed together with the connecting shaft after the connecting shaft is removed. After the limit plate is removed, the fixing bolt can be screwed, and the fixing bolt rotates in the fixing plate and the limit groove to disassemble the fixing plate and the fixing bolt, and then the fixing bolt can be pulled out from the limit groove. The shaft seat can be removed from the outer side of the shaft core by pulling out the fixing bolt, and the fixing plate can be removed at the same time to complete the disassembly.

[0016] 2. The detachable crank fixes the fixing plate and the shaft seat to the outside of the shaft core through the limit groove and the groove by setting the fixing bolts. The limit plate limits the position of the fixing bolts. The fixing bolt fixes the connecting shaft and the limit plate at the same time. The limit rod fixes the position of the fixing bolt and the limit plate limits the connecting shaft in the opposite direction. Finally, the limit rod is limited by the installation rod. Multiple limitations ensure the stability of the overall structure and solve the problem of inconvenient disassembly of traditional cranks. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional cross-sectional view of the structure of the utility model;

[0018] Figure 2 This is a front view of the structure of the utility model;

[0019] Figure 3 This is a cross-sectional view of the structure of the utility model;

[0020] Figure 4 It is a three-dimensional stereogram of the structure of the utility model;

[0021] Figure 5 It is a three-dimensional stereogram of the structure of the utility model.

[0022] In the figure: 1, shaft core; 2, limiting groove; 3, fixing bolt; 4, shaft seat; 5, wheel plate; 6, fixing plate; 7, connecting groove; 8, fixing groove; 9, fixing bolt; 10, connecting shaft; 11, limiting plate; 12, limiting rod; 13, fixing seat; 14, mounting seat a; 15, mounting rod; 16, mounting seat b; 17, limiting slot. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figure 1-5A detachable crank comprises an axis core 1, a connecting device is provided on the side of the axis core 1, and a fixing device used in conjunction with the connecting device; the fixing device comprises a plurality of limiting grooves 2 opened on the outer surface of the axis core 1, a fixing bolt 3 is provided inside the limiting groove 2, a shaft seat 4 with a movable connection is provided on the outer side of the axis core 1, a wheel 5 is provided on the outer side of the shaft seat 4, a fixing plate 6 is provided on the side of the axis core 1, a plurality of connecting grooves 7 are opened inside the fixing plate 6, a fixing groove 8 is opened on the side of the axis core 1, a fixing bolt 9 with a movable connection is provided inside the fixing groove 8, a connecting shaft 10 with a movable connection is provided on the outer side of the fixing bolt 9, a limiting plate 11 is provided on the outer side of the connecting shaft 10, and a limiting rod 12 is provided inside the connecting shaft 10.

[0025] In this embodiment, the connecting device includes a fixing seat 13 fixedly mounted on the side of the fixing plate 6, a movably connected mounting seat a14 is provided on the outer side of the seat rod of the fixing seat 13, a movably connected mounting rod 15 is provided on the inner side of the connecting shaft 10, and a movably connected mounting seat b16 is provided on the outer side of the mounting rod 15 located outside the connecting shaft 10.

[0026] In this embodiment, the side of the fixing bolt 3 is slidably connected to the limiting groove 2, and the end of the fixing bolt 3 is threaded into the connecting groove 7 and fixedly installed with the fixing plate 6 by threads, so that the fixing bolt 3 can fix the fixing plate 6 on the side of the shaft core 1.

[0027] In this embodiment, the inner wall of the shaft seat 4 is provided with a plurality of grooves for cooperating with the fixing bolts 3, and the sides of the grooves are slidably connected to the fixing bolts 3, and the outer side of the shaft seat 4 and the wheel plate 5 are fixedly installed, so that when the fixing bolts 3 are fixed in the grooves and the fixing plates 6 are fixed, it can be ensured that the shaft seat 4 cannot rotate at will on the outer side of the shaft core 1.

[0028] In this embodiment, the interior of the connecting shaft 10 is a hollow structure, the fixing bolt 9 transversely passes through one side of the connecting shaft 10 and is rotatably connected to the connecting shaft 10, the end of the fixing bolt 9 is threaded into the fixing groove 8 and the shaft core 1 is fixed and installed by threads, so that one end of the fixing bolt 9 is threadedly connected to the fixing groove 8 while limiting the position of the connecting shaft 10 and forming a fixed structure with the shaft core 1.

[0029] In this embodiment, a plurality of limit slots 17 for use with the fixing bolts 3 are opened inside the limit plate 11. The shape of the limit slots 17 is similar to the shape of the nut of the fixing bolt 3 to limit the rotation of the fixing bolt 3. In this way, the limit plate 11 can limit the rotation of the fixing bolt 3 when fixed, thereby enhancing the stability of the overall structure.

[0030] In this embodiment, the shape of the limiting rod 12 is adapted to the hollow structure of the connecting shaft 10 and is slidably connected to the inner wall of the connecting shaft 10. The inner wall of the connecting shaft 10 is provided with a threaded pattern, so that when the limiting rod 12 is inside the connecting shaft 10, it can limit the relative position change of the fixing bolt 9 with the connecting shaft 10, thereby enhancing the stability of the structure.

[0031] In this embodiment, a thread pattern is provided on the outside of the seat rod of the fixing seat 13, and the mounting seat a14 and the fixing seat 13 are fixedly installed by threads, so that the mounting seat a14 and the fixing seat 13 can be disassembled while forming a fixed structure.

[0032] In this embodiment, a thread is provided on the outer side of the mounting rod 15, and one end of the mounting rod 15 is threaded into the interior of the connecting shaft 10 and is threadedly fixed to the connecting shaft 10. The outer side of the mounting rod 15 and the mounting seat b16 are fixedly installed by threads, so that the mounting rod 15 can limit the position of the limit rod 12 in the connecting shaft 10 and fix the mounting seat b16 at the same time.

[0033] The working principle of the above embodiment is:

[0034] By rotating the mounting rod 15, the thread of the mounting rod 15 rotates on the inner side wall of the connecting shaft 10, and then the mounting rod 15 is removed. After unscrewing the mounting rod 15, the limiting rod 12 is slid and taken out from the inside of the connecting shaft 10. After taking out the limiting rod 12, the fixing bolt 9 is rotated again. After the fixing bolt 9 is turned down, the connecting shaft 10 can be removed. After the connecting shaft 10 is removed, the limiting plate 11 can be removed together. After removing the limiting plate 11, the fixing bolt 3 can be screwed. After the fixing bolt 3 rotates in the fixing plate 6 and the limiting groove 2 so that the fixing plate 6 and the fixing bolt 3 are disassembled, the fixing bolt 3 can be pulled out from the limiting groove 2. By pulling out the fixing bolt 3, the shaft seat 4 can be removed from the outside of the shaft core 1, and the fixing plate 6 can be removed at the same time to complete the disassembly.

[0035] In addition, the fixing bolt 3 fixes the fixing plate 6 and the shaft seat 4 to the outside of the shaft core 1 through the limit groove 2 and the groove, the limit plate 11 limits the position of the fixing bolt 3, the fixing bolt 9 fixes the connecting shaft 10 while fixing the limit plate 11, the limit rod 12 fixes the position of the fixing bolt 9, and the limit plate 11 reversely limits the connecting shaft 10, and finally the limit rod 12 is limited by the installation rod 15, and multiple limitations ensure the stability of the overall structure.

[0036] The electrical components appearing in the article are all electrically connected to the main controller and the power supply. The main controller can be a conventional known device for control such as a computer, and the existing public power connection technology is not described in detail in the article.

[0037] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0038] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention.

Claims

1. A detachable crank, comprising a shaft core (1), characterized in that: The side surface of the shaft core (1) is provided with a connecting device and a fixing device used in conjunction with the connecting device; The fixing device comprises a plurality of limit grooves (2) provided on the outer surface of the shaft core (1), a fixing bolt (3) is provided inside the limit groove (2), a movable shaft seat (4) is provided on the outer side of the shaft core (1), a wheel disc (5) is provided on the outer side of the shaft seat (4), a fixing plate (6) is provided on the side of the shaft core (1), a plurality of connecting grooves (7) are provided inside the fixing plate (6), a fixing groove (8) is provided on the side of the shaft core (1), a movable fixing bolt (9) is provided inside the fixing groove (8), a movable connecting shaft (10) is provided on the outer side of the fixing bolt (9), a limit plate (11) is provided on the outer side of the connecting shaft (10), and a limit rod (12) is provided inside the connecting shaft (10).

2. A detachable crank according to claim 1, characterized in that: The connecting device comprises a fixing seat (13) fixedly mounted on the side of the fixing plate (6), a movable mounting seat a (14) is provided on the outer side of the seat rod of the fixing seat (13), a movable mounting rod (15) is provided on the inner side of the connecting shaft (10), and a movable mounting seat b (16) is provided on the outer side of the mounting rod (15) located outside the connecting shaft (10).

3. A detachable crank according to claim 1, characterized in that: The side surface of the fixing bolt (3) is slidably connected to the limiting groove (2), and the end of the fixing bolt (3) is threadedly screwed into the connecting groove (7) and is fixedly installed with the fixing plate (6) through threads.

4. A detachable crank according to claim 1, characterized in that: The inner side wall of the shaft seat (4) is provided with a plurality of grooves used to cooperate with the fixing bolts (3), and the sides of the grooves are slidably connected to the fixing bolts (3), and the outer side of the shaft seat (4) is fixedly mounted to the wheel disc (5).

5. A detachable crank according to claim 1, characterized in that: The interior of the connecting shaft (10) is a hollow structure, the fixing bolt (9) passes through one side of the connecting shaft (10) transversely and is rotatably connected to the connecting shaft (10), the end of the fixing bolt (9) is threaded into the fixing groove (8) and the shaft core (1) is fixedly installed by means of the thread.

6. A detachable crank according to claim 1, characterized in that: The limiting plate (11) is provided with a plurality of limiting slots (17) for use with the fixing bolts (3). The shape of the limiting slots (17) is similar to the shape of the nut of the fixing bolt (3) to limit the rotation of the fixing bolt (3).

7. A detachable crank according to claim 1, characterized in that: The shape of the limiting rod (12) is mutually compatible with the hollow structure of the connecting shaft (10) and is slidably connected to the inner wall of the connecting shaft (10); the inner wall of the connecting shaft (10) is provided with a thread pattern.

8. A detachable crank according to claim 2, characterized in that: The seat rod of the fixing seat (13) is provided with a thread pattern on the outside, and the mounting seat a (14) and the fixing seat (13) are fixedly mounted via threads.

9. A detachable crank according to claim 2, characterized in that: The outer side of the mounting rod (15) is provided with a thread, and one end of the mounting rod (15) is threadedly screwed into the interior of the connecting shaft (10) and is threadedly fixedly installed with the connecting shaft (10), and the outer side of the mounting rod (15) and the mounting seat b (16) are threadedly fixedly installed.

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