Bicycle hub aluminum tower

Abstract

The utility model discloses a bicycle hub drum aluminum tower base relates to the aluminum tower base field, to solve the recess for placing the pawl in the tower base integral type setting of prior art, when the recess appears damage when the tower base long -time use, cannot independently replace, need to replace the tower base integrally, the problem of poor economy. Aluminum tower base front end is connected with the fixed ring, the fixed ring front end is connected with the fixed pipe, is provided with the connecting ring on the fixed pipe, three pawl recesses are arranged on the connecting ring outer wall annular array, three pawl recesses are provided with the pawl, the connecting ring outside is connected with the blocking ring, when the pawl or pawl recess appears abrasion, only need to disassemble the second countersunk screw of connecting ring rear end can replace the whole connecting ring, or disassemble the first countersunk screw of blocking ring and replace the pawl alone, avoided the problem that traditional integral type tower base needs to replace integrally when partial damage.

Description

Technical Field

[0001] This utility model relates to the field of bicycle aluminum hub bases, specifically a bicycle hub aluminum hub base. Background Technology

[0002] The aluminum freehub body is a key component in the hub (the core component of the wheel axle) that directly meshes with the sprockets on the freewheel, and is usually made of aluminum alloy. Its inner wall has grooves or toothed structures (such as the common "ratchet mechanism"), which transmit pedaling power by meshing with the internal teeth of the freewheel and allow for one-way freewheeling during gliding. Aluminum freehubs are commonly used in entry-level to mid-range sports bicycles, while professional racing models may use titanium alloy or steel-aluminum composite structures to balance strength and weight. Its design directly affects shifting response speed and transmission efficiency, making it one of the core components of the drivetrain reliability.

[0003] For example, application publication number CN104806660A discloses a one-way transmission mechanism between a bicycle freehub and a hub body, including a freehub, a hub body, and a bottom bracket. The freehub and hub body are connected to the bottom bracket. A pawl is provided on the circumference of the freehub that mates with the hub body, and the pawl is movably bolted to the freehub. A middle ring is provided between the freehub and the hub body on the bottom bracket. A guide ramp from the inside out is provided on the outer circumference of the middle ring. A resistance mechanism is provided between the middle ring and the bottom bracket. One end of the chuck lies on the guide ramp, with the bolting point located at the root of the guide ramp. A spring is installed around the freehub base, which passes around and presses against the chuck. The hub body has an internal toothed ring, which corresponds to the position of the chuck. The chuck is placed inside the internal toothed ring. By controlling the extension and retraction of the chuck, the chuck and the internal toothed ring can be engaged and disengaged. When disengaged, they are completely separated, which can achieve a silent and noiseless effect when the bicycle is pushed forward and driven by inertia, reducing inertial resistance.

[0004] However, the grooves for placing the chucks in the above-mentioned freehub base are integrated with the freehub base. When the grooves are damaged after long-term use, they cannot be replaced independently and the entire freehub base needs to be replaced, which is not economical. Therefore, the market urgently needs to develop an aluminum freehub base for bicycle hubs to help people solve the existing problems. Utility Model Content

[0005] The purpose of this utility model is to provide an aluminum freehub base for bicycle hubs, in order to solve the problem mentioned in the background art that the groove for placing the pawl in the existing freehub base is integrated with the freehub base. When the groove is damaged after long-term use, it cannot be replaced independently and the entire freehub base needs to be replaced, which is not economical.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a bicycle hub aluminum freehub base, comprising an aluminum freehub base, a fixing ring connected to the front end of the aluminum freehub base, a fixing tube connected to the front end of the fixing ring, a connecting ring provided on the fixing tube, three claw grooves arranged in a ring array on the outer wall of the connecting ring, claws provided inside the three claw grooves, and a blocking ring connected to the outside of the connecting ring.

[0007] Preferably, the front end of the aluminum tower base is fixedly connected to the rear end of the fixing ring, and the front end of the fixing ring is fixedly connected to the rear end of the fixing pipe.

[0008] Preferably, one end of the claw is rotatably connected inside the claw groove, and a spring is connected between the inner wall of the claw groove and the inner end face of the claw.

[0009] Preferably, a first keyway is provided on the upper end of the inner wall of the connecting ring, and a connecting key is fixedly connected to the upper end of the fixing tube. After the connecting ring is sleeved on the outside of the fixing tube, the connecting key is inserted into the first keyway.

[0010] Preferably, the annular array of the rear end face of the connecting ring is provided with a plurality of second threaded holes, and the rear end face of the connecting ring and the fixing ring are fixed by a plurality of second countersunk screws passing through the fixing ring and being inserted into the plurality of second threaded holes respectively.

[0011] Preferably, a second keyway is provided on the upper end of the inner wall of the blocking ring, and after the blocking ring is fitted onto the outside of the fixing tube, the front end of the connecting key is inserted into the second keyway.

[0012] Preferably, the front end face of the connecting ring is provided with a second threaded hole on both sides, and the blocking ring and the front end face of the connecting ring are fixed by two first countersunk screws passing through the blocking ring and being inserted into the two second threaded holes respectively.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] (1) In this utility model, a modular and detachable structure design is adopted. Specifically, the traditional integrated claw groove is improved into an independent and replaceable connecting ring assembly. The assembly consists of a connecting ring, a claw groove, a claw, and a blocking ring. When the claw or claw groove is worn, the entire connecting ring can be replaced by removing the second countersunk screw at the rear end of the connecting ring, or the claw can be replaced separately by removing the first countersunk screw of the blocking ring. This design avoids the problem that the traditional integrated tower needs to be replaced as a whole when there is partial damage, which greatly reduces the maintenance cost.

[0015] (2) In this utility model, the transmission stability is ensured by a precise keyway fit structure. A connecting key is set on the fixed tube, and a first keyway is machined on the inner wall of the connecting ring and a second keyway is provided on the inner wall of the blocking ring. This multi-level keyway fit structure not only realizes the precise positioning between the components, but also effectively prevents relative slippage during the transmission process and ensures the reliability of power transmission. Compared with the traditional method of simply relying on threaded connection, this design significantly improves the transmission accuracy and service life.

[0016] (3) In this utility model, a double-protection claw fixing structure is adopted. The rear end of the claw groove is closed by the fixing ring and the front end is closed by the blocking ring to form a complete protective structure. This design not only ensures the stability of the claw during operation, but also facilitates disassembly during maintenance. In particular, the blocking ring is fixed by countersunk screws, which does not affect the overall appearance and allows for quick disassembly for claw replacement. Compared with the traditional welding or one-piece molding fixing method, this detachable structure greatly improves the convenience of maintenance. Attached Figure Description

[0017] Figure 1 This is a front view of an aluminum hub base for a bicycle according to the present invention;

[0018] Figure 2 This is a main sectional view of the connecting ring of this utility model;

[0019] Figure 3 This is a side sectional view of the present invention;

[0020] Figure 4 This is a top sectional view of the present invention.

[0021] In the diagram: 1. Aluminum tower base; 101. Fixing ring; 102. Fixing tube; 103. Connecting key; 2. Connecting ring; 201. First keyway; 202. Claw groove; 203. Claw; 204. Spring; 205. First threaded hole; 206. Second threaded hole; 3. Blocking ring; 301. Second keyway; 302. First countersunk screw; 4. Second countersunk screw. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] Please see Figure 1-4This utility model provides an embodiment of a bicycle hub aluminum freehub base, comprising an aluminum freehub base 1, a fixing ring 101 connected to the front end of the aluminum freehub base 1, a fixing tube 102 connected to the front end of the fixing ring 101, a fixed connection between the front end of the aluminum freehub base 1 and the rear end of the fixing ring 101, and a fixed connection between the front end of the fixing ring 101 and the rear end of the fixing tube 102, a connecting ring 2 provided on the fixing tube 102, a first keyway 201 provided on the upper end of the inner wall of the connecting ring 2, and a connecting key 103 fixedly connected to the upper end of the fixing tube 102, wherein the connecting ring 2 is inserted into the outside of the fixing tube 102 to connect the key. 103 is inserted into the first keyway 201, so that the connecting ring 2 and the fixed tube 102 are initially positioned by the connecting key 103 and the first keyway 201. The annular array of the rear end face of the connecting ring 2 is provided with multiple second threaded holes 206. The rear end face of the connecting ring 2 and the fixed ring 101 are connected and fixed by multiple second countersunk screws 4 passing through the fixed ring 101 and being inserted into the multiple second threaded holes 206 respectively. The connecting ring 2 and the fixed tube 102 are fixed by multiple second countersunk screws 4, so that when the aluminum tower base 1 rotates, the connecting ring 2 rotates synchronously.

[0024] Please see Figure 2 The outer wall of the connecting ring 2 has three claw grooves 202 arranged in a ring array. Claws 203 are disposed inside the three claw grooves 202. One end of each claw 203 is rotatably connected within the claw groove 202. A spring 204 connects the inner wall of the claw groove 202 and the inner end face of the claw 203. The claw grooves 202 are connected to both the front and rear end faces of the connecting ring 2. When the connecting ring 2 is fixedly connected to the fixing ring 101, the fixing ring 101 seals the rear end of the claw groove 202 to prevent the claws 203 from detaching from the rear end of the claw groove 202. When the connecting ring 2 is in use, the springs 204 keep the claws 203 away from the rotating part. One end of the connecting ring 2 extends outward from the outer wall. When the rider pedals, the aluminum base 1 drives the fixed tube 102 to rotate through the fixed ring 101 fixedly connected to its front end. The fixed tube 102 engages with the first keyway 201 on the connecting ring 2 through the connecting key 103, so that the connecting ring 2 rotates synchronously. At this time, the claw 203 on the outer wall of the connecting ring 2 pops outward under the action of centrifugal force and the elastic force of the spring 204, and meshes with the internal teeth of the flywheel to realize power transmission. When the bicycle glides, the flywheel rotates in the opposite direction, forcing the claw 203 to compress the spring 204 and retract into the claw groove 202, realizing one-way free rotation and avoiding reverse resistance.

[0025] Please see Figure 3 and Figure 4A blocking ring 3 is connected to the outside of the connecting ring 2. A second keyway 301 is provided on the upper end of the inner wall of the blocking ring 3. After the blocking ring 3 is fitted onto the outside of the fixing tube 102, the front end of the connecting key 103 is inserted into the second keyway 301, so that the blocking ring 3 and the fixing tube 102 are initially positioned for assembly. A second threaded hole 206 is provided on both sides of the front end face of the connecting ring 2. The blocking ring 3 and the front end face of the connecting ring 2 are connected and fixed by two first countersunk screws 302 passing through the blocking ring 3 and being inserted into the two second threaded holes 206 respectively. The blocking ring 3 and the connecting ring 2 are connected and fixed by threads. The front end is fixed to seal the front end of the claw groove 202. When the claw 203 is damaged, the blocking ring 3 and the connecting ring 2 are separated by removing the two first countersunk screws 302. After compressing the spring 204 inside the damaged claw 203, the damaged claw 203 can be pulled out from the front end of the claw groove 202 for replacement. At the same time, when the claw groove 202 is damaged, the connecting ring 2 can be pulled out from the fixing tube 102 by removing the multiple second countersunk screws 4. The claw 203 and the connecting ring 2 can be separated, and the connecting ring 2 can be replaced independently.

[0026] Working Principle: During use, when the rider pedals, the aluminum hub 1 rotates the fixed tube 102 via the fixed ring 101, which is fixedly connected to its front end. The fixed tube 102 engages with the first keyway 201 on the connecting ring 2 via the connecting key 103, causing the connecting ring 2 to rotate synchronously. At this time, the claw 203 on the outer wall of the connecting ring 2 pops outward under the action of centrifugal force and the elastic force of the spring 204, meshing with the internal teeth of the flywheel to achieve power transmission. When the bicycle glides, the flywheel rotates in the opposite direction, forcing the claw 203 to compress the spring 204 and retract into the claw groove 202, achieving unidirectional free rotation and avoiding reverse resistance. The fixed ring 101 is fixed to the rear end of the connecting ring 2 by the second countersunk screw 4 to prevent the claw 203 from falling off from the rear; while the blocking ring 3 is fixed to the front end of the connecting ring 2 by the first countersunk screw 302, sealing the front side of the claw groove 202 and ensuring the stable operation of the claw 203. If the chuck 203 is damaged, simply remove the first countersunk screw 302 and take off the retaining ring 3 to replace the damaged chuck 203. If the chuck groove 202 is worn, the second countersunk screw 4 can be removed to detach the entire connecting ring 2 from the fixing tube 102 for replacement, eliminating the need to replace the entire tower base and improving economy and ease of maintenance. This design optimizes transmission stability through a modular structure while reducing maintenance costs.

[0027] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A bicycle hub aluminium drop out comprising an aluminium drop out (1) characterised in that: The aluminum tower base (1) is connected to a fixing ring (101) at the front end, and a fixing pipe (102) is connected to the front end of the fixing ring (101). A connecting ring (2) is provided on the fixing pipe (102). Three claw grooves (202) are arranged in a ring array on the outer wall of the connecting ring (2). Claws (203) are provided inside the three claw grooves (202). A blocking ring (3) is connected to the outside of the connecting ring (2). The front end of the aluminum tower base (1) is fixedly connected to the rear end of the fixing ring (101), and the front end of the fixing ring (101) is fixedly connected to the rear end of the fixing pipe (102). One end of the claw (203) is rotatably connected inside the claw groove (202), and a spring (204) is connected between the inner wall of the claw groove (202) and the inner end face of the claw (203). The upper end of the inner wall of the connecting ring (2) is provided with a first keyway (201), and the upper end of the fixed tube (102) is fixedly connected with a connecting key (103). After the connecting ring (2) is sleeved on the outside of the fixed tube (102), the connecting key (103) is inserted into the first keyway (201). The rear end face of the connecting ring (2) is provided with a ring array of multiple second threaded holes (206). The rear end face of the connecting ring (2) and the fixing ring (101) are connected and fixed by multiple second countersunk screws (4) passing through the fixing ring (101) and being inserted into the multiple second threaded holes (206) respectively. The upper end of the inner wall of the blocking ring (3) is provided with a second keyway (301). After the blocking ring (3) is fitted into the outside of the fixing tube (102), the front end of the connecting key (103) is inserted into the second keyway (301). The connecting ring (2) has two second threaded holes (206) on both sides of its front end face. The blocking ring (3) and the front end face of the connecting ring (2) are fixed by two first countersunk screws (302) passing through the blocking ring (3) and then being inserted into the two second threaded holes (206) respectively.

Images