Gear and rotating shaft matching structure and fishing reel

Abstract

The application relates to a matching structure between a gear and a rotating shaft, which comprises the rotating shaft and the gear sleeved on the rotating shaft, wherein a circumferentially-extending groove is formed on the surface of the rotating shaft, and a spring piece corresponding to the groove is arranged on the gear, the spring piece is provided with a convex part which can fall into the groove to make the rotating shaft and the gear rotate together, and the convex part can also slide out of the groove to make the rotating shaft and the gear relatively rotate. The application also discloses a fishing reel with the matching structure. After the matching structure is adopted, irreversible damage of parts in a transmission system can be avoided. When one of a double-helix guide rod, a guide wire claw and a guide wire seat is abnormal or external sundries interfere with the axial sliding of the guide wire seat, the convex part can be separated from the groove on the rotating shaft to make the rotating shaft and the gear slip, and the jerk feeling generated in the process can prompt a user that the transmission system is abnormal. When the abnormal condition is eliminated, the transmission system is still intact, so that the service life of the fishing reel is prolonged.

Description

Technical Field

[0001] This utility model relates to the technical field of gear transmission structure, specifically to a gear and shaft mating structure and a fishing reel using the mating structure. Background Technology

[0002] Gear transmission structures are widely used. A typical structure consists of a first gear mounted on a shaft (or gear shaft) and a second gear meshing with it. Rotation of the shaft drives both the first and second gears to rotate. To achieve torque transmission, a common method is to mount the first gear on the shaft using a keyway structure (keyway fit); or design the shaft as a flat shaft, with the gear's center hole designed as a non-circular hole that mates with the flat shaft. While this structure provides reliable transmission, it can potentially damage other components in the transmission system under abnormal operating conditions. For example, when applied to fishing reels, a drive device that drives the line-laying mechanism to reciprocate along the reel's axis (see the structure disclosed in Chinese Patent Publication No. CN205695127U "Drum-type Star-shaped Brake Sea Fishing Reel with Line Laying") includes a shaft, a first gear, and a second gear. The shaft (also called a spool or gear shaft) is coaxial with the reel's drive shaft, the first gear is mounted on the shaft, and the second gear meshes with the first gear. The line-laying device includes a line-laying reel meshing with the second gear and mounted on a double-helix guide rod, a line-laying bracket (also called a guide seat) fitted onto the double-helix guide rod, and a horn-shaped claw (also called a guide claw) mounted on the line-laying bracket and meshing with the double-helix guide rod. When reeling in the line, the handle of the fishing reel is turned, causing the shaft to rotate (synchronously with the reel), which in turn rotates the first gear, which in turn rotates the second gear, which in turn rotates the line-laying reel. This, in turn, causes the double-helix guide rod to rotate, and the guide claw moves the line-laying bracket back and forth, so that the fishing line threaded through the through-hole of the line-laying bracket is evenly wound onto the reel, ultimately achieving the purpose of reeling in the line. However, during use, if at least one of the guide claws, double-helix guide rod, or guide seat malfunctions, or if external debris interferes with the axial sliding of the guide seat, the entire transmission system may suffer irreversible damage.

[0003] Therefore, existing technologies sometimes employ a clutch-like design between the gear and the shaft. For example, in Chinese patent application publication number CN119737433A, a groove is provided on the shaft, and a spring and rollers are installed in the groove. The restoring force of the spring causes the rollers to press tightly against the inner ring of the gear ring, achieving linkage between the gear ring and the shaft. At the same time, when the torque is too large, the gear ring can rotate relative to the shaft, thereby preventing damage to the components in the transmission system. Utility Model Content

[0004] The first technical problem to be solved by this utility model is to provide a matching structure between a gear and a rotating shaft, which can also prevent damage to the components in the transmission system when the torque is too large during the transmission process.

[0005] The second technical problem to be solved by this utility model is to provide a fishing reel with the above-mentioned matching structure, which can prevent damage to the transmission components in the fishing reel when the torque is too large during the line winding process.

[0006] The technical solution adopted by this utility model to solve the first technical problem mentioned above is as follows: a mating structure between a gear and a rotating shaft, including a rotating shaft and a gear fitted on the rotating shaft through a central hole, characterized in that: a circumferentially extending groove is formed on the surface of the rotating shaft, and a spring piece corresponding to the groove is provided on the gear, and the spring piece is provided with a protrusion that always has a radial tendency to bulge towards the groove side, the protrusion can fall into the groove so that the rotating shaft and the gear rotate together, and the protrusion can also slide away from the groove so that the rotating shaft and the gear rotate relative to each other.

[0007] In the above scheme, it is preferable that the protrusion is located in the middle of the spring piece, and the spring pieces on both sides of the protrusion become the mounting parts connected to the gear, so that the spring piece is subjected to uniform force and works reliably.

[0008] For ease of installation and stable transmission, the gear has a mounting groove that penetrates at least one end face of the gear and can accommodate the spring piece. The mounting groove is connected to the central hole through an opening. In the natural state of the spring piece, the protrusion is exposed in the central hole through the opening.

[0009] To facilitate the insertion of the protrusion, the opening also extends through at least one end face of the gear.

[0010] When the mounting groove penetrates both ends of the gear, the rotating shaft is provided with a retaining ring that can abut against one end face of the gear to cover the opening of the mounting groove on that end face, so as to prevent the spring piece from falling off.

[0011] In order to allow the spring to have better deformation space and to ensure that the protrusion always protrudes towards the groove side, the bottom surface of the mounting groove relative to the opening is designed as an arc surface and a plane connected to both ends of the arc surface, with each plane providing abutment for the corresponding mounting part.

[0012] Preferably, in its natural state, there is a gap between the mounting part of the spring and the inner wall of the mounting groove, which allows the spring to deform flexibly and recover freely after being compressed.

[0013] In the above solutions, there are multiple grooves, which are distributed at intervals along the circumference, and correspondingly, there are also multiple spring pieces. The design of multiple grooves and spring pieces makes the transmission smoother and more reliable.

[0014] Due to space constraints, it is generally preferable to have three grooves that are evenly distributed circumferentially, and correspondingly, there are also three spring pieces.

[0015] The technical solution adopted by this utility model to solve the second technical problem mentioned above is: a fishing reel, including a rotating shaft and a gear fitted on the rotating shaft through a central hole, wherein the gear meshes with a line-laying reel mounted on a double-helix guide rod of the fishing reel, characterized in that the cooperation structure between the gear and the rotating shaft adopts the above-mentioned cooperation structure.

[0016] Compared to existing technologies, this invention adds a spring with a protrusion to the gear and creates a groove on the shaft to mate with the protrusion. When the protrusion falls into the groove, the shaft and gear rotate together, transmitting torque. As resistance increases during rotation, the protrusion is forced to slide out of the groove, allowing the shaft and gear to rotate relative to each other. Therefore, when this structure is applied to a fishing reel, if any of the double-helix guide rod, guide claw, or guide seat malfunctions or external debris interferes with the axial sliding of the guide seat (i.e., increased resistance), the protrusion on the spring detaches from the groove on the shaft, causing slippage between the shaft and the transmission gear until the protrusion slides into the next groove (if there are multiple grooves). The resulting jerking or other unusual sensations indicate a problem with the transmission system. Once the problem is resolved, the transmission system remains intact, preventing irreversible damage to components and extending the lifespan of the fishing reel. Attached Figure Description

[0017] Figure 1 This is a three-dimensional sectional view of an embodiment of the present invention mounted on a fishing reel;

[0018] Figure 2 for Figure 1 A three-dimensional schematic diagram after removing the main body and other components;

[0019] Figure 3 for Figure 2 A three-dimensional diagram from another direction;

[0020] Figure 4 for Figure 2 A 3D schematic diagram after removing the thread reel and other components;

[0021] Figure 5 This is a three-dimensional exploded view of the gear, shaft, and spring in an embodiment of this utility model. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0023] In the following description of the embodiments, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "axial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Since the embodiments disclosed in this invention can be arranged in different directions, these terms indicating direction are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0024] The gear and shaft mating structure in this embodiment can be applied to the transmission systems of different devices. In order to better understand the mating between the gear and shaft, this embodiment describes it by installing it on a fishing reel.

[0025] like Figures 1 to 5 As shown, the fishing reel described in this utility model, also known as a baitcasting reel, includes a main body 10, a reel 20 for winding fishing line, a rocker arm assembly 30, a guide ring assembly 40, a transmission mechanism 50 for driving the guide ring assembly 40 to reciprocate axially, and a braking mechanism 60. Since the main body 10, reel 20, rocker arm assembly 30, guide ring assembly 40, and braking mechanism 60 are all prior art, they will not be described in detail here.

[0026] The aforementioned transmission mechanism 50 includes a rotating shaft 1, a gear 2 mounted on the rotating shaft through a central hole 21 (which is a round hole), and a transmission wheel 4 coaxially mounted with the gear 2. The transmission wheel 4 meshes with a driven wheel 5 mounted on a threaded shaft 201. The gear 3 meshes with a wire guide wheel 7 on a double helical guide rod 6. The rotating shaft 1 is also equipped with the aforementioned brake mechanism 60. Rotating the adjusting wheel 601 on the brake mechanism 60 can adjust the braking force, allowing the transmission wheel 4 to move in conjunction with or rotate relative to the rotating shaft 1.

[0027] In this embodiment, the main improvement is to the fit structure between the gear 2 and the shaft 1 in the transmission mechanism 50. Specifically, a circumferentially extending groove 11 is formed on the surface of the shaft 1. In the figure, there are three grooves 11, which are evenly spaced arc-shaped grooves along the circumference. Of course, one or two can be designed as needed, and four can be used if the size of the shaft 1 allows. Correspondingly, a spring piece 3 is provided on the gear 2, corresponding to the number of grooves 11. Each spring piece 3 is provided with a protrusion 31 that always has a radial tendency to rise towards the corresponding groove 11. The protrusion 31 can fall into the corresponding groove 11, so that the shaft 1 and the gear 2 rotate together. When the protrusion 31 slides away from the corresponding groove 11, the shaft 1 and the gear 2 can rotate relative to each other.

[0028] To ensure even force distribution, in this embodiment, the protrusion 31 is located in a semi-circular arc structure at the middle position of the spring piece 3, and the spring pieces on both sides of the protrusion 31 become mounting parts 32 connected to the gear 2. Furthermore, considering ease of installation, the gear 2 has mounting grooves 22 penetrating both ends of the gear 2. Depending on the number of spring pieces, there are three mounting grooves 22, evenly distributed circumferentially. Each mounting groove 22 allows the corresponding spring piece 3 to be movably accommodated within it. The mounting groove 22 communicates with the central hole 21 through an opening 23. In the spring piece 3's natural state, the protrusion 31 protrudes into the central hole 21 through the opening 23, allowing it to fall into or slide out of the corresponding groove 11 on the rotating shaft 1 as needed. For ease of installation, the opening also penetrates at least one end face of the gear 2 (shown in the figure as penetrating both ends of the gear 2). Thus, during installation, the spring piece 3 can be inserted into the mounting groove 22 along the axial direction of the rotating shaft 1, with the protrusion 31 protruding from the opening 23, making assembly very convenient.

[0029] To prevent the spring 3 from falling out of the mounting slot 22, the rotating shaft 1 is provided with one end face that can engage with one end face of the gear 2. Figure 4 The retaining ring 12, which abuts against the right end face of the gear 2, covers the opening of the mounting groove 22 on that end face. After installation, the opening of the mounting groove on the left end face of the gear 2 is blocked by the retaining plate 80 sleeved on the rotating shaft 1.

[0030] Furthermore, considering that the spring 3 will deform under force, the mounting groove 22 can provide space for the spring 3 to deform slightly. In the natural state of the spring 3, there is a gap between the mounting part 32 of the spring 3 and the inner wall of the corresponding mounting groove 22. At the same time, in order to ensure that the protrusion 31 on the spring 3 always tends to extend towards the groove 11, the bottom surface of the mounting groove 22 relative to the opening 23 is designed as an arc surface 221 and planes 222 respectively connected to the two ends of the arc surface. Each plane 222 is used for the corresponding mounting part 32 to abut.

[0031] In use, rotating the rocker arm 301 in the rocker arm assembly 30 causes the rotating shaft 1 to rotate, which in turn drives the transmission wheel 4 and the driven wheel 5 through the brake mechanism 60 to rotate the line reel 20. At the same time, the rotating shaft 1 rotates, which drives the gear 2 to rotate through the spring 3, and drives the line reel 7 to rotate. Then, the double helix guide rod 6 rotates in turn, and the line claw 401 in the line ring assembly 40 drives the line seat 402 to move back and forth, so that the fishing line passing through the through hole of the line seat 402 is evenly wound on the line reel 20, and finally achieves the purpose of reeling in the fishing line.

[0032] During the aforementioned use, if any of the double helix guide rod 6, guide claw 401, or guide seat 402 experiences a structural abnormality or external debris interferes with the axial sliding of the guide seat, the resistance increases. This causes the protrusion 31 on the spring 3 to disengage from the corresponding groove 11 on the rotating shaft 1, resulting in slippage between the rotating shaft 1 and the gear 2. This continues until the protrusion 31 on the spring 3 rotates relative to the rotating shaft 1 and slides into the next groove 11. If this abnormality is not resolved, this cycle repeats, causing the user to experience a jerking or other unusual sensation when turning the rocker arm. This indicates a problem with the transmission system. Once the abnormality is resolved, the parts in the transmission system, double helix guide rod, and guide assembly remain intact, thus preventing irreversible damage to the components and ultimately extending the lifespan of the fishing reel.

[0033] Although the preferred embodiments of this utility model have been described in detail above, it should be clearly understood that various modifications and variations can be made to this utility model by those skilled in the art. For example, one end of the spring can be fixed to the end face of the gear, and the protrusion can be provided on the other end of the spring. Alternatively, the above-mentioned mounting groove only penetrates one end face of the gear. Alternatively, the mounting groove does not penetrate the end face of the gear, and the mounting part extends directly into the mounting groove from the opening. That is, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A gear-shaft mating structure, comprising a shaft (1) and a gear (2) fitted onto the shaft (1) through a central hole (21), characterized in that: The rotating shaft (1) has a circumferentially extending groove (11) on its surface. The gear (2) is provided with a spring piece (3) corresponding to the groove (11). The spring piece (3) is provided with a protrusion (31) that always has a radial tendency to bulge towards the groove (11). The protrusion (31) can fall into the groove (11) to make the rotating shaft (1) and the gear (2) rotate together. The protrusion (31) can also slide away from the groove (11) to make the rotating shaft (1) and the gear (2) rotate relative to each other.

2. The gear-shaft mating structure according to claim 1, characterized in that: The protrusion (31) is located in the middle of the spring (3), and the springs (3) on both sides of the protrusion (31) become the mounting parts (32) connected to the gear (2).

3. The gear-shaft mating structure according to claim 2, characterized in that: The gear (2) has a mounting groove (22) that passes through at least one end face of the gear (2) and can accommodate the spring (3). The mounting groove (22) is connected to the center hole through an opening (23). In the natural state of the spring (3), the protrusion (31) is exposed in the center hole (21) through the opening (23).

4. The gear-shaft mating structure according to claim 3, characterized in that: The opening (23) also penetrates at least one end face of the gear (2).

5. The gear-shaft mating structure according to claim 3, characterized in that: When the mounting groove (22) passes through both ends of the gear (2), the rotating shaft (1) is provided with a retaining ring (12) that can abut against one end face of the gear (2) and can cover the opening of the mounting groove (22) on that end face.

6. The gear-shaft mating structure according to claim 3, characterized in that: The bottom surface of the mounting groove (22) relative to the opening is designed as an arc surface (221) and a plane (222) respectively connected to both ends of the arc surface (221), and each plane (222) is provided for the corresponding mounting part (32) to abut.

7. The gear-shaft mating structure according to claim 3, characterized in that: In its natural state, the spring (3) has a gap between the mounting portion (32) and the inner wall of the mounting groove (22).

8. The gear-shaft mating structure according to any one of claims 1 to 6, characterized in that: There are multiple grooves (11) that are distributed at intervals along the circumference, and there are also multiple spring pieces (3).

9. The gear-shaft mating structure according to claim 8, characterized in that: There are three grooves (11) that are evenly distributed circumferentially, and correspondingly, there are also three spring pieces (3).

10. A fishing reel, comprising a shaft (1) and a gear (2) fitted onto the shaft (1) through a central hole (21), said gear (2) meshing with a line-laying reel (7) mounted on a double-helix guide rod (6) of the fishing reel, characterized in that... The fit between the gear (2) and the shaft (1) adopts the fit structure described in any one of claims 1-9.

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