Fitness bicycle pedal anti-loosening structure

Abstract

The utility model discloses an exercise bicycle pedal anti-loosening structure which comprises a middle shaft (1), a middle shaft (2), a connecting piece (3), a connecting piece (4), a connecting piece (5) and a connecting piece (6). The end of the middle shaft (1) is provided with an inserting portion (2) with a polygonal section, and a threaded hole is formed in the inserting portion (2). An inserting groove (4) is formed in one side of the crank (3), a mounting groove (5) is formed in the other side of the crank (3), and a plurality of groups of first limiting grooves (6) are uniformly distributed in the end face of the crank (3) on the side of the mounting groove (5); the crank (3) is locked on the middle shaft (1) through the first locking screw (7), and second limiting grooves (10) which are evenly distributed are formed in the end of the first locking screw (7); a limiting bulge (12) is arranged on one side of the gasket (11); and the second locking screw (13) is used for locking the gasket (11) on the crank (3) and the end part of the first locking screw (7). The pedal mechanism can reduce the possibility of relative movement between the crank and the middle shaft and the possibility of loosening of the pedal mechanism, and is good in safety.

Description

Technical Field

[0001] This utility model relates to an anti-loosening structure for exercise bicycle pedals, and more particularly to an anti-loosening structure for the crank in the pedal mechanism of an exercise bicycle. Background Technology

[0002] The bicycle pedal mechanism mainly includes the following parts: pedals, the part that directly contacts the rider's foot, usually made of plastic, aluminum alloy, or carbon fiber, with possible anti-slip textures or fixing devices on the surface; bearings, located between the pedals and the axle, reducing friction and ensuring smooth pedal rotation. Common types include ball bearings and sealed bearings; the axle, a metal shaft connecting the pedals and the crank, usually made of steel or aluminum alloy, responsible for transmitting pedaling force; the crank, the component connecting the axle to the bicycle's bottom bracket, transmitting pedaling force to the chain and wheels, mostly made of aluminum alloy or carbon fiber; and lock nuts or bolts, used to secure the pedals to the crank and prevent loosening.

[0003] The crank is connected to the bottom bracket, which drives the sprocket and chain. During long-term riding, the crank can easily become loose relative to the bottom bracket, posing a safety hazard. This is especially true for exercise bikes, which are subject to heavy loads, which accelerates the loosening process. Utility Model Content

[0004] The purpose of this invention is to provide an anti-loosening structure for exercise bicycle pedals. It reduces the possibility of relative movement between the crank and the bottom bracket, thus reducing the likelihood of the pedal mechanism becoming loose, and provides good safety.

[0005] The technical solution of this utility model: a foot pedal anti-loosening structure for exercise bicycles, comprising:

[0006] The central shaft has a polygonal cross-sectional plug-in part at one end, and the plug-in part has a threaded hole inside;

[0007] The crank has a plug groove on one side that corresponds to the plug part, and a mounting groove on the other side that is larger than the plug groove. Multiple sets of evenly distributed first limiting grooves are provided on the crank end face of the mounting groove side.

[0008] The first locking screw locks the crank on the central shaft, and the end of the first locking screw is provided with a uniformly distributed second limiting groove;

[0009] The gasket has a limiting protrusion on one side corresponding to the first limiting groove and the second limiting groove, and a third limiting groove on the other side;

[0010] The second locking screw locks the washer to the crank and the end of the first locking screw. When locked, the first limiting groove and the second limiting groove are on the same straight line and the limiting protrusion is stuck in the first limiting groove and the second limiting groove.

[0011] In the aforementioned anti-loosening structure for exercise bicycle pedals, the first locking screw includes a rod portion corresponding to the threaded hole of the insertion portion and a head portion corresponding to the mounting groove. The head portion has a threaded hole on its inner side, and the second limiting groove is located on the outer end face of the head portion.

[0012] In the aforementioned anti-loosening structure for exercise bike pedals, the second locking screw includes a rod body with a threaded hole opposite to the head, a rod head at the end of the rod body, a screwdriver groove at the outer end of the rod head, and a retaining strip corresponding to the third limiting groove on the inner side of the rod head.

[0013] In the aforementioned anti-loosening structure for exercise bike pedals, the number of second limiting grooves is greater than the number of first limiting grooves, and the number of second limiting grooves is an integer multiple of the number of first limiting grooves.

[0014] In the aforementioned anti-loosening structure for exercise bicycle pedals, the outer cross-sectional shape of the plug portion continuously decreases along the direction close to the crank.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] This application uses a first locking screw to connect the bottom shaft and the crank, and the end face of the first locking screw is provided with a second limiting groove and the end face of the crank is provided with a first limiting groove. The limiting protrusion on one side of the washer engages with the first limiting groove and the second limiting groove to prevent relative rotation between the crank and the bottom shaft. The second locking screw further locks the washer, resulting in a good anti-loosening effect. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the first locking screw of this utility model;

[0020] Figure 4 This is a schematic diagram of the structure of the second locking screw of this utility model;

[0021] Figure 5 This is a schematic diagram of the structure of the gasket of this utility model.

[0022] The markings in the attached diagram are as follows: 1-central shaft, 2-insertion part, 3-crank, 4-insertion groove, 5-mounting groove, 6-first limiting groove, 7-first locking screw, 8-rod, 9-head, 10-second limiting groove, 11-waist, 12-limiting protrusion, 13-second locking screw, 14-rod body, 15-rod head, 16-screwdriver groove, 17-third limiting groove, 18-locking strip. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0024] Example. A foot pedal anti-loosening structure for an exercise bike, comprising as follows: Figure 1-5 As shown, it includes:

[0025] The central shaft 1 has a polygonal cross-sectional plug-in part 2 at its end, and the plug-in part 2 has a threaded hole inside.

[0026] The crank 3 has a plug groove 4 on one side corresponding to the plug part 2, and a mounting groove 5 on the other side that is larger than the plug groove 4. Multiple sets of evenly distributed first limiting grooves 6 are provided on the end face of the crank 3 on the mounting groove 5 side.

[0027] The first locking screw 7 locks the crank 3 onto the central shaft 1, and the end of the first locking screw 7 is provided with a uniformly distributed second limiting groove 10;

[0028] The gasket 11 has a limiting protrusion 12 on one side corresponding to the first limiting groove 6 and the second limiting groove 10, and a third limiting groove 17 on the other side;

[0029] The second locking screw 13 locks the washer 11 to the crank 3 and the end of the first locking screw 7. When locked, the first limiting groove 6 and the second limiting groove 10 are on the same straight line and the limiting protrusion 12 is engaged in the first limiting groove 6 and the second limiting groove 10.

[0030] The first locking screw 7 includes a rod 8 corresponding to the threaded hole of the insertion part 2 and a head 9 corresponding to the mounting groove 5. The head 9 has a threaded hole on its inner side, and the second limiting groove 10 is provided on the outer end face of the head 9.

[0031] The second locking screw 13 includes a rod 14 with a threaded hole opposite to the head 9, a rod head 15 at the end of the rod 14, a screwdriver groove 16 at the outer end of the rod head 15, and a retaining strip 18 corresponding to the third limiting groove 17 on the inner side of the rod head 15.

[0032] The number of the second limiting grooves 10 is greater than the number of the first limiting grooves 6, and the number of the second limiting grooves 10 is an integer multiple of the number of the first limiting grooves 6.

[0033] The shape of the outer cross section of the plug part 2 decreases continuously along the direction close to the crank 3.

[0034] The principle of this invention is as follows: First, the central shaft 1 is inserted into the insertion groove of the crank 3 through the insertion part 2 at its end. Then, the first locking screw 7 is screwed into the mounting groove 5 at the other end of the crank 3 to achieve a fixed connection of the central shaft 1, and to align the second limiting groove 10 of the first locking screw 7 with the first limiting groove 6 of the crank 3. Next, a washer 11 is installed, and the limiting protrusion 12 on one side of the washer 11 is engaged in the first limiting groove 6 and the second limiting groove 10. This limits the position of the first locking screw 7 relative to the crank 3, thus preventing loosening. Then, the second locking screw 13 is installed. The shaft 14 of the second locking screw 13 has external threads, and the shaft 14 of the second locking screw 13 screws into the first locking screw 7. The head 15 of the second locking screw 13 fixes the washer 11. This makes it difficult for the central shaft 1 and the crank 3 in the pedal mechanism to move relative to each other, thus achieving a good anti-loosening effect. Furthermore, the retaining strip 18 on the second locking screw 13 will engage with the third limiting groove 17 of the washer 11 to prevent the second locking screw 13 from rotating relative to the washer 11, further enhancing the anti-loosening effect. The washer 11 is a flexible washer with a certain degree of elasticity, so that the washer 11 can undergo a certain deformation during the rotation of the second locking screw 13 relative to the washer, allowing the second locking screw 13 to be stably engaged with the washer 11. In this way, the second locking screw 13 will compress the washer 11, causing the washer to generate an axial force on the second locking screw 13, making it difficult for the second locking screw 13 to rotate relative to the washer, thus providing good anti-loosening performance.

Claims

1. A foot pedal anti-loosening structure for an exercise bicycle, characterized in that, include: The central shaft (1) has a polygonal cross-section plug (2) at its end, and a threaded hole is provided inside the plug (2); The crank (3) has a plug groove (4) on one side that corresponds to the plug part (2), and a mounting groove (5) on the other side that is larger than the plug groove (4). Multiple sets of evenly distributed first limiting grooves (6) are provided on the end face of the crank (3) on the mounting groove (5). The first locking screw (7) locks the crank (3) onto the central shaft (1), and the end of the first locking screw (7) is provided with a uniformly distributed second limiting groove (10); The gasket (11) has a limiting protrusion (12) on one side corresponding to the first limiting groove (6) and the second limiting groove (10), and a third limiting groove (17) on the other side; The second locking screw (13) locks the washer (11) to the crank (3) and the end of the first locking screw (7). When locked, the first limiting groove (6) and the second limiting groove (10) are on the same straight line and the limiting protrusion (12) is stuck in the first limiting groove (6) and the second limiting groove (10).

2. The anti-loosening structure for exercise bike pedals according to claim 1, characterized in that: The first locking screw (7) includes a rod (8) corresponding to the threaded hole of the insertion part (2) and a head (9) corresponding to the mounting groove (5). The head (9) has a threaded hole on its inner side, and the second limiting groove (10) is provided on the outer end face of the head (9).

3. The anti-loosening structure for exercise bike pedals according to claim 2, characterized in that: The second locking screw (13) includes a rod (14) with a threaded hole opposite to the head (9), a rod head (15) at the end of the rod (14), a screwdriver groove (16) at the outer end of the rod head (15), and a retaining strip (18) corresponding to the third limiting groove (17) on the inner side of the rod head (15).

4. The anti-loosening structure for exercise bike pedals according to claim 1, characterized in that: The number of the second limiting grooves (10) is greater than the number of the first limiting grooves (6), and the number of the second limiting grooves (10) is an integer multiple of the number of the first limiting grooves (6).

5. The anti-loosening structure for exercise bike pedals according to claim 1, characterized in that: The outer cross-sectional shape of the plug part (2) decreases continuously along the direction close to the crank (3).

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