Bicycle middle axle assembly structure

Abstract

The utility model relates to the technical field of center shaft assembling structures, in particular to a bicycle center shaft assembling structure which comprises a center shaft body, a crankset, a crank, a limiting assembly, a locking assembly, a fastening assembly and a fixing assembly. A locking assembly is arranged at one end of the center shaft body, a chain wheel is arranged on the side wall of the center shaft body, a fixing assembly is arranged in the chain wheel, a fastening assembly is arranged on one side of the fixing assembly, a crank is arranged on one side of the fastening assembly, and a limiting assembly with a limiting function is arranged on one side of the crank. According to the middle shaft assembling structure, the limiting structure and the locking structure are arranged, the middle shaft assembling structure and the crankset are assembled and fixed through the fixing structure, then the fastening structure and the fixing structure are assembled and fixed, finally, the limiting structure and the crank can abut against each other for limiting through assembling and fixing of the locking structure, and therefore the purpose of limiting, locking and assembling can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of middle shaft assembly structures, in particular to a bicycle middle shaft assembly structure. Background Art

[0002] The tooth plate assembly of the bicycle comprises a tooth plate, a middle shaft, a left crank and a right crank, the left crank and the right crank are respectively mounted on the two ends of the middle shaft, the tooth plate is either mounted on the middle shaft or on the left crank (or the right crank), the chain is wound around the tooth plate, the middle shaft and the tooth plate are driven to rotate by pedaling the pedals at the ends of the left crank and the right crank, thereby realizing the driving of the chain, and then the rear wheel is driven by the chain. The utility model relates to the technical field of middle shaft assembly structure. With the development of society, the middle shaft assembly structure industry is becoming more and more developed, and the middle shaft assembly structure is also continuously improved to meet the needs of production. Most middle shaft assembly structures have the function of fixed installation, and the function of limited locking assembly is not perfect enough, which is inconvenient to use. The tooth plate and the middle shaft assembly structure occupy too much space, and the structure between the crank and the tooth plate is not compact enough. In addition, a positioning sleeve is used to fix it through a connecting screw that penetrates the middle shaft, which destroys the structural stability of the middle shaft. The connecting screw is easy to loosen due to metal fatigue caused by vibration, thereby inconvenient to realize the problem of limited locking assembly. Utility Model Content

[0003] In order to overcome the problem that the chainring and the bottom shaft assembly structure occupy too much space during use, and the structure between the crank and the chainring is not compact enough, a positioning sleeve is used to fix the bottom shaft through connecting screws that pass through the bottom shaft, which destroys the structural stability of the bottom shaft. The connecting screws are prone to loosening due to metal fatigue caused by vibration, making it inconvenient to achieve limit locking assembly.

[0004] The technical solution of the utility model is: a bicycle middle shaft assembly structure, including a middle shaft body, a chainring, a crank, a limit assembly, a locking assembly, a fastening assembly and a fixing assembly; a locking assembly is arranged at one end of the middle shaft body, a chainring is arranged on the side wall of the middle shaft body, a fixing assembly is arranged inside the chainring, a fastening assembly is arranged at one side of the fixing assembly, a crank is arranged at one side of the fastening assembly, and a limit assembly with a limit function is arranged at one side of the crank.

[0005] Preferably, first, the chainring is slid to the first step portion of the central axis body, and then assembled and fixed with the chainring by means of a fixing assembly. Subsequently, the fastening assembly and the fixing assembly are assembled and fixed, and the crank and the chainring can be assembled and fixed. Finally, the locking assembly is assembled and fixed, and the limit assembly and the crank can be limited by contact, thereby achieving the purpose of limit locking assembly.

[0006] Preferably, the limit assembly includes a limit ring and an anti-slip pad; a limit ring is arranged on the side wall of one end of the central axis body, an anti-slip pad is arranged on one side of the limit ring, and the other side of the limit ring is in contact with the side wall of the crank; through the assembly and fixation of the locking assembly, the limit ring and the crank can be contacted and limited, thereby achieving the effect of limit locking installation.

[0007] Preferably, the locking assembly includes a locking nut and a locking threaded hole; a locking threaded hole is opened at one end of the central axis body, a locking nut is arranged inside the locking threaded hole, and the locking nut is threadedly connected to the locking threaded hole; the locking nut and the locking threaded hole are assembled and fixed, so that the limit collar and the crank can be limited by contact, thereby achieving the effect of limit locking installation.

[0008] Preferably, the fastening assembly includes a mounting ring, a recessed disk and a fastening threaded hole; a mounting ring is provided on the side wall of the central axis body, a recessed disk is provided on the outside of the mounting ring, and a fastening threaded hole is provided on the side wall of the recessed disk; the fastening assembly is assembled and fixed through the fastening threaded hole, and the crank can be assembled and fixed with the mounting ring.

[0009] Preferably, the fastening assembly also includes a boss and a fastening thread groove; a boss is provided on one side of the mounting collar, the boss is fixedly connected to one side of the crank, and fastening thread grooves are provided on the side walls of the boss, and the boss is threadedly connected to the fastening thread hole through the fastening thread groove; the boss is assembled and fixed with the fastening thread hole of the recessed disc through the fastening thread groove, so that the crank can be assembled and fixed to the mounting collar.

[0010] Preferably, the fixing assembly includes a fixing ring and a through hole; a fixing ring is arranged inside the chainring, the outer wall of the fixing ring is fixedly connected to the inner wall of the chainring, the inner wall of the fixing ring is slidably connected to the outer wall of the central axis body, and a through hole is provided on the side wall of the fixing ring, and multiple groups of through holes are provided; first, the chainring is slid to the first step portion of the central axis body through the fixing ring, and then the fixing assembly is limited by correspondingly passing through the multiple groups of through holes on the side wall of the fixing ring.

[0011] Preferably, the fixing assembly includes a threaded column, a fixing nut and an anti-slip gasket; a threaded column is arranged on the side wall of the mounting collar, and multiple groups of threaded columns are arranged, the threaded column is arranged inside the through hole, a fixing nut is arranged at one end of the threaded column, the fixing nut is threadedly connected to the threaded column, and an anti-slip gasket is arranged on one side of the fixing nut; first, the chainring is slid to the first step portion of the central axis body through the fixing collar, and then, the mounting collar is used to make multiple groups of threaded columns pass through the multiple groups of through holes on the side wall of the fixing collar correspondingly, and then the anti-slip gasket is installed on the outside of the threaded column, and then, the multiple groups of fixing nuts are assembled and fixed with the multiple groups of threaded columns in turn, so that the purpose of assembly and fixation can be achieved.

[0012] Beneficial effects of the utility model:

[0013] 1. Compared with the traditional middle shaft assembly structure, during use, the space occupied by the tooth plate and the middle shaft assembly structure is too large, and the structure between the crank and the tooth plate is not compact enough. In addition, the positioning sleeve is fixed by the connecting screws that penetrate the middle shaft, which destroys the structural stability of the middle shaft. The connecting screws are easily loosened due to metal fatigue caused by vibration, which makes it inconvenient to achieve the problem of limited locking assembly. The middle shaft assembly structure is provided with a limiting structure and a locking structure. First, the tooth plate is slid to the first step of the middle shaft body, and then, it is assembled and fixed with the tooth plate through the fixing structure. Subsequently, the fastening structure is assembled and fixed with the fixing structure, and the crank can be assembled and fixed with the tooth plate. Finally, it is assembled and fixed through the locking structure, and the limiting structure and the crank can be limited by contact, so as to achieve the purpose of limited locking assembly.

[0014] 2. First, slide the chainring to the first step of the central axis body through the fixing collar, then, by using the mounting collar, allow the multiple sets of threaded columns to pass through the multiple sets of through holes on the side wall of the fixing collar, and then install the anti-skid pads on the outside of the threaded columns. Subsequently, assemble and fix the multiple sets of fixing nuts with the multiple sets of threaded columns in sequence, so that the fixing assembly and the chainring can be assembled and fixed, and the convex plate can be assembled and fixed with the fastening threaded groove and the fastening threaded hole of the concave plate, so that the crank can be assembled and fixed, and finally, the locking nut and the locking threaded hole can be assembled and fixed, so that the limiting collar and the crank can be contacted and limited, so as to achieve the purpose of limited locking assembly;

[0015] 3. After the positioning rod is installed through the positioning hole and the mounting hole, the rebound force generated by the elastic deformation of the positioning spring can achieve the effect of buffering protection. Finally, the fixing block can be fixed to the vehicle body by fixing the threaded hole with the fixing bolt. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 What is shown is a first three-dimensional structural schematic diagram of a bicycle middle shaft assembly structure of the utility model;

[0017] Figure 2 What is shown is a schematic diagram of a first partial three-dimensional structure of a bicycle middle shaft assembly structure of the utility model;

[0018] Figure 3 The second partial three-dimensional structure schematic diagram of a bicycle middle shaft assembly structure of the utility model is shown;

[0019] Figure 4 The third partial three-dimensional structure schematic diagram of a bicycle middle shaft assembly structure of the utility model is shown;

[0020] Explanation of the accompanying drawings: 1. Limiting assembly; 2. Locking assembly; 3. Fastening assembly; 4. Fixing assembly; 5. Central axis body; 6. Chainring; 7. Crank; 101. Limiting collar; 102. Anti-skid sleeve; 201. Locking nut; 202. Locking threaded hole; 301. Mounting collar; 302. Concave disc; 303. Fastening threaded hole; 304. Convex disc; 305. Fastening threaded groove; 401. Fixing collar; 402. Through hole; 403. Threaded column; 404. Fixing nut; 405. Anti-skid pad. DETAILED DESCRIPTION

[0021] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0022] See also Figure 1 The utility model provides an embodiment: a bicycle middle axis assembly structure, including a middle axis body 5, a chainring 6, a crank 7, a limit assembly 1, a locking assembly 2, a fastening assembly 3 and a fixing assembly 4; a locking assembly 2 is arranged at one end of the middle axis body 5, a chainring 6 is arranged on the side wall of the middle axis body 5, a fixing assembly 4 is arranged inside the chainring 6, a fastening assembly 3 is arranged on one side of the fixing assembly 4, a crank 7 is arranged on one side of the fastening assembly 3, and a limit assembly 1 with a limiting function is arranged on one side of the crank 7.

[0023] See also Figure 2 The limiting assembly 1 includes a limiting collar 101 and an anti-slip pad 102; a limiting collar 101 is arranged on the side wall of one end of the central axis body 5, and an anti-slip pad 102 is arranged on one side of the limiting collar 101, and the other side of the limiting collar 101 is in contact with the side wall of the crank 7; through the assembly and fixation of the locking assembly 2, the limiting collar 101 and the crank 7 can be in contact and limited, so as to achieve the effect of limiting and locking installation; the locking assembly 2 includes a locking nut 201 and a locking threaded hole 202; a locking threaded hole 202 is opened at one end of the central axis body 5, and a locking nut 201 is arranged inside the locking threaded hole 202, and the locking nut 201 is threadedly connected with the locking threaded hole 202; the locking nut 201 is assembled and fixed with the locking threaded hole 202, so that the limiting collar 101 and the crank 7 can be restrained and limited, so as to achieve the effect of limiting locking installation; the fastening component 3 includes a mounting collar 301, a recessed disk 302 and a fastening threaded hole 303; the side wall of the central axis body 5 is provided with a mounting collar 301, the outside of the mounting collar 301 is provided with a recessed disk 302, and the side wall of the recessed disk 302 is provided with a fastening threaded hole 303; the fastening component 3 is assembled and fixed through the fastening threaded hole 303, and the crank 7 can be assembled and fixed with the mounting collar 301.

[0024] See also Figure 3-4In this embodiment, the fastening assembly 3 also includes a convex plate 304 and a fastening thread groove 305; a convex plate 304 is provided on one side of the mounting collar 301, and the convex plate 304 is fixedly connected to one side of the crank 7. A fastening thread groove 305 is provided on the side wall of the convex plate 304, and the convex plate 304 is threadedly connected to the fastening thread hole 303 through the fastening thread groove 305; the convex plate 304 is assembled and fixed with the fastening thread hole 303 of the concave plate 302 through the fastening thread groove 305, so that the crank 7 can be fixed to the concave plate 302. The mounting ring 301 is assembled and fixed; the fixing assembly 4 includes a fixing ring 401 and a through hole 402; the interior of the crankset 6 is provided with a fixing ring 401, the outer wall of the fixing ring 401 is fixedly connected to the inner wall of the crankset 6, the inner wall of the fixing ring 401 is slidably connected to the outer wall of the central axis body 5, and the side wall of the fixing ring 401 is provided with a through hole 402, and the through hole 402 is provided with multiple groups; first, the crankset 6 is slid to the first step portion of the central axis body 5 through the fixing ring 401, and then , the fixing component 4 is passed through the multiple groups of through holes 402 on the side wall of the fixing collar 401 for positioning; the fixing component 4 includes a mounting collar 301, a threaded column 403, a fixing nut 404 and an anti-slip gasket 405; a threaded column 403 is arranged on the side wall of the mounting collar 301, and a plurality of groups of threaded columns 403 are arranged, the threaded column 403 is arranged inside the through hole 402, and a fixing nut 404 is arranged at one end of the threaded column 403, and the fixing nut 404 is threadedly connected with the threaded column 403, A non-slip gasket 405 is provided on one side of the fixing nut 404; first, the chainring 6 is slid to the first step portion of the central axis body 5 through the fixing ring 401, and then, the multiple groups of threaded columns 403 are made to pass through the multiple groups of through holes 402 on the side wall of the fixing ring 401 through the mounting ring 301, and then the non-slip gasket 405 is installed on the outside of the threaded columns 403, and then, the multiple groups of fixing nuts 404 are assembled and fixed with the multiple groups of threaded columns 403 in turn, so as to achieve the purpose of assembly and fixation.

[0025] When working, first, slide the crankset 6 to the first step portion of the central axis body 5 through the fixing collar 401, then, by using the mounting collar 301, allow the multiple sets of threaded columns 403 to pass through the multiple sets of through holes 402 on the side wall of the fixing collar 401, and then install the anti-slip pads 405 on the outside of the threaded columns 403, and then, assemble and fix the multiple sets of fixing nuts 404 with the multiple sets of threaded columns 403 in sequence, so that the fixing assembly 4 and the crankset 6 can be assembled and fixed;

[0026] Furthermore, the convex plate 304 is assembled and fixed with the fastening threaded hole 303 of the concave plate 302 through the fastening threaded groove 305, so that the crank 7 and the toothed plate 6 can be assembled and fixed;

[0027] Finally, the locking nut 201 and the locking threaded hole 202 are assembled and fixed, so that the limiting collar 101 and the crank 7 can be restrained and limited, thereby achieving the purpose of limiting and locking assembly.

[0028] Through the above steps, first, slide the chainring 6 to the first step portion of the central axis body 5, then assemble and fix it with the chainring 6 through the fixing component 4, then assemble and fix the fastening component 3 with the fixing component 4, and then the crank 7 and the chainring 6 can be assembled and fixed, and finally, assembled and fixed through the locking component 2, so that the limit component 1 and the crank 7 can be restrained and limited, thereby achieving the purpose of limit locking assembly.

[0029] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of those skilled in the art without departing from the purpose of the present invention.

Claims

1. A bicycle middle shaft assembly structure, comprising a middle shaft body (5); characterized in that: It also comprises a toothed disc (6), a crank (7), a limiting assembly (1), a locking assembly (2), a fastening assembly (3) and a fixing assembly (4); one end of the central axis body (5) is provided with a locking assembly (2), a toothed disc (6) is provided on the side wall of the central axis body (5), a fixing assembly (4) is provided inside the toothed disc (6), a fastening assembly (3) is provided on one side of the fixing assembly (4), a crank (7) is provided on one side of the fastening assembly (3), and a limiting assembly (1) with a limiting function is provided on one side of the crank (7); The fastening assembly (3) comprises a mounting collar (301), a recessed disc (302) and a fastening threaded hole (303); the mounting collar (301) is arranged on the side wall of the central axis body (5), the recessed disc (302) is arranged outside the mounting collar (301), and the fastening threaded hole (303) is provided on the side wall of the recessed disc (302); the fastening assembly (3) also comprises a convex disc (304) and a fastening threaded groove (305); a convex disc (304) is arranged on one side of the mounting collar (301), the convex disc (304) is fixedly connected to one side of the crank (7), the side wall of the convex disc (304) is provided with a fastening threaded groove (305), and the convex disc (304) is threadedly connected to the fastening threaded hole (303) through the fastening threaded groove (305); The fixing assembly (4) comprises a fixing collar (401) and a through hole (402); the fixing collar (401) is arranged inside the toothed disc (6); the outer wall of the fixing collar (401) is fixedly connected to the inner wall of the toothed disc (6); the inner wall of the fixing collar (401) is slidably connected to the outer wall of the central axis body (5); the side wall of the fixing collar (401) is provided with a through hole (402); the through hole (402) is provided in a plurality of groups; the fixing assembly (4) comprises a threaded column (401); 3), a fixing nut (404) and an anti-skid gasket (405); a threaded column (403) is arranged on the side wall of the mounting collar (301), and a plurality of groups of threaded columns (403) are arranged, the threaded column (403) is arranged inside the through hole (402), a fixing nut (404) is arranged at one end of the threaded column (403), the fixing nut (404) is threadedly connected to the threaded column (403), and an anti-skid gasket (405) is arranged on one side of the fixing nut (404).

2. A bicycle middle shaft assembly structure according to claim 1, characterized in that: The limiting assembly (1) comprises a limiting collar (101) and an anti-slip sleeve pad (102); a limiting collar (101) is arranged on a side wall at one end of the central axis body (5), an anti-slip sleeve pad (102) is arranged on one side of the limiting collar (101), and the other side of the limiting collar (101) is in contact with the side wall of the crank (7).

3. The bicycle middle shaft assembly structure according to claim 1, characterized in that: The locking assembly (2) comprises a locking nut (201) and a locking threaded hole (202); one end of the central axis body (5) is provided with a locking threaded hole (202), a locking nut (201) is arranged inside the locking threaded hole (202), and the locking nut (201) is threadedly connected to the locking threaded hole (202).

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