CN221873728U - Gear ring and pawl optimizing structure of bicycle hub - Google Patents

Abstract

The utility model provides a gear ring and pawl optimization structure of a bicycle hub, which comprises a hub body, a gear ring, a tower foundation body, a pawl structure and a shaft core, wherein outer teeth are arranged on the outer circle of the gear ring, the hub body is provided with inner teeth, the gear ring is in threaded connection with the hub body until the inner side surface of the gear ring is tightly attached to the inner step side surface of the hub body, inverted straight teeth are uniformly distributed on the inner circle of the gear ring, the tower foundation body is arranged on the right side of the hub body, the pawl structure is arranged on the left side of the tower foundation body, the pawl structure is in circular meshing arrangement with the gear ring, the shaft core is arranged in the hub body in a penetrating manner, a bearing is arranged in the tower foundation body, and the right end of the shaft core is in rotary connection with the tower foundation body through the bearing. According to the use requirement, the utility model not only ensures the meshing strength of the gear ring and the pawl, but also has small meshing angle, high meshing efficiency and reduced energy consumption, and more satisfies the acoustic feast of dense tooth noise. The installation tower foundation is smooth, the service life of the flower drum is prolonged, and the flower drum is safe and stable.

Description

An optimized structure of gear ring and ratchet of bicycle hub

Technical Field

The utility model relates to the field of hub ratchet structures, in particular to an optimized structure of a gear ring and a ratchet of a bicycle hub.

Background Art

The hub gear ring is the component that carries the power of the one-way pawl at the connection between the hub body and the freewheel base. It is commonly known as the gear ring and is an indispensable component of a bicycle. It is usually locked to the right side of the hub body (corresponding to the freewheel base) with an external tooth pattern, and the left side of the gear ring presses against the right side of the inner step of the hub. The inner straight teeth of the gear ring are used to clamp the one-way pawl of the freewheel base, carry the power from the gear flywheel, drive the hub body to rotate, and thus drive the wheel.

The freewheel pawl is the component that transmits unidirectional power at the connection between the freewheel body and the hub, also known as the jack. It is an indispensable component of a bicycle and is usually evenly distributed on the left end face of the freewheel body (the side corresponding to the hub). The cylindrical surface of the pawl is movably inserted into the outer circular groove of the freewheel body (can rotate in a small range). Under the action of the return spring, the one-way pawl maintains an outward extended posture to ensure that the freewheel body (flywheel) always engages with the ring gear when rotating in the forward direction, driving the hub to rotate, thereby achieving the purpose of wheel rotation.

Based on strength considerations, the effective tooth height of conventional gear rings should not be too low (to prevent gear slippage), so the number of teeth is limited, and the one-way ratchet tooth bite angle is limited; later, a structure with two groups of meshing appeared, with two groups of ratchet teeth staggered by 1/2 teeth. When the first group of ratchet engages, the second group of ratchet engages by 1/2 teeth staggered; and when the second group of ratchet engages, the first group of ratchet engages by 1/2 teeth staggered... By analogy, the meshing angle is reduced by 1 time, improving the ratchet meshing efficiency. However, it still cannot meet customers' advanced pursuit of meshing angle (idle clearance) and close tooth noise (the sound of the ratchet meshing the gear ring during reverse idling).

A novel tooth ring and ratchet structure of a bicycle hub is now needed to solve the above-mentioned problems.

Utility Model Content

The utility model provides an optimized structure of a tooth ring and a pawl of a bicycle hub, and solves the problems of the existing pawl structure having too large an engagement angle, low engagement efficiency, high energy consumption and poor close-tooth sound effect by technically transforming the existing hub pawl structure.

In order to achieve the above purpose, the technical solution adopted by the utility model is:

A toothed ring and pawl optimized structure of a bicycle hub comprises a hub body, a toothed ring, a freewheel body, a pawl structure and an axle core, wherein the outer circle of the toothed ring is provided with an outer tooth pattern, the hub body is provided with an inner tooth pattern, the toothed ring is threadedly connected to the hub body until the inner side surface of the toothed ring is in close contact with the side surface of a step in the hub body, the inner circle of the toothed ring is evenly distributed with inverted straight teeth, a freewheel body is installed on the right side of the hub body, a pawl structure is installed on the left side of the freewheel body, the pawl structure is geared with the inner circle of the toothed ring, an axle core is passed through the hub body, a bearing is installed inside the freewheel body, and the right end of the axle core is rotatably connected to the freewheel body through the bearing.

Preferably, an end cap is installed at the right end of the tower base body, and the inner cavity of the end cap is sleeved on the right end surface of the shaft core.

Preferably, the pawl structure includes a double-toothed pawl and a return spring, the tooth end of the double-toothed pawl is forked into two teeth, and the two teeth engage the gear ring at the same time, the base end of the double-toothed pawl is semi-cylindrical, and the tower base body is provided with an outer circular groove, and the base end of the double-toothed pawl is movably installed in the outer circular groove of the tower base, and a return spring is also installed in the outer circular groove of the tower base body, and the return spring is arranged to resist the double-toothed pawl so that the double-toothed pawl maintains an outward extended posture.

Preferably, the number of teeth of the inverted straight teeth is 90T, and the single tooth meshing angle is 4 degrees.

Preferably, nine outer circular grooves are opened at the left end of the tower base body, and the number of double-toothed ratchets is nine, which are evenly spaced and distributed around the left end of the tower base body.

Preferably, the double-toothed pawls are grouped into three (120°/pawl), namely the first pawl group, the second pawl group and the third pawl group. The first pawl group, the second pawl group and the third pawl group are staggered by 1/3 teeth between each group, and the meshing angle is 4/3 degrees.

The beneficial effects of the utility model are:

The utility model is provided with a double-toothed pawl, which meshes with the gear ring at the same time, and the bite force is greatly enhanced compared with the traditional single-tooth, ensuring that the teeth are not easy to slip. The base end of the pawl is semi-cylindrical, and is movably installed in the outer circular groove of the tower base body, and can be set to rotate in a small range. A return spring is installed in the outer circular groove of the tower base body. Under the action of the return spring, the pawl maintains an outward posture, ensuring that the tower base body (tooth flywheel) always meshes with the gear ring when rotating in the forward direction, driving the hub body to rotate, thereby achieving the purpose of wheel rotation.

The freewheel base of the utility model is provided with nine square and round grooves and pawls, 3 pawls form a group (120°/pawl), there are 3 groups in total, 1/3 teeth are offset between each group, the meshing angle will be 4/3 degree, the meshing is very efficient, and a sound is emitted every 4/3 degree rotation (90*3=270 sounds are emitted for 1 circle), which meets the advanced pursuit of cycling enthusiasts for the sound of dense teeth.

According to the use requirements, this application not only ensures the meshing strength of the gear ring and the pawl, but also has a smaller meshing angle, high meshing efficiency and reduced energy consumption, improves meshing efficiency, and can carry strong power, and more satisfy the auditory feast of dense tooth sound. The installation of the freehub is smooth, which enhances the service life of the hub, is safe and stable, and greatly improves the service life.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a structural diagram of the utility model;

Fig. 2 is a schematic diagram of the cross-sectional structure of the utility model;

Figures 3-4 are schematic diagrams of the explosion structure of the utility model;

FIG5 is a schematic diagram of the ratchet structure of the utility model;

Explanation of the accompanying drawings: hub body 1, inner tooth pattern 11, gear ring 2, inverted inclined straight teeth 21, outer tooth pattern 22, freewheel base body 3, bearing 31, end cap 32, outer circular groove 33, pawl structure 4, double-toothed pawl 41, first pawl group 411, second pawl group 412, third pawl group 413, return spring 42, shaft core 5.

DETAILED DESCRIPTION

The specific contents of the utility model are described in detail below with reference to the accompanying drawings and embodiments.

Please refer to Figures 1-5, the utility model provides an optimized structure of a gear ring 2 and a pawl of a bicycle hub, comprising a hub body 1, a gear ring 2, a freewheel body 3, a pawl structure 4 and an axle core 5, the outer circle of the gear ring 2 is provided with an outer tooth pattern 22, the hub body 1 is provided with an inner tooth pattern 11, the gear ring 2 is threadedly connected to the hub body 1 until the inner side surface of the gear ring 2 is close to the side surface of the step inside the hub body 1, the inner circle of the gear ring 2 is evenly distributed with inverted inclined straight teeth 21, the freewheel body 3 is installed on the right side of the hub body 1, the pawl structure 4 is installed on the left side of the freewheel body 3, the pawl structure 4 is geared with the inner circle of the gear ring 2, the hub body 1 is penetrated by a axle core 5, the freewheel body 3 is installed with a bearing 31, and the right end of the axle core 5 is rotatably connected to the freewheel body 3 through the bearing 31.

Furthermore, in order to seal and protect the shaft core 5 and the tower base body 3 , an end cap 32 is installed at the right end of the tower base body 3 , and the inner cavity of the end cap 32 is sleeved on the right end surface of the shaft core 5 .

Furthermore, in order to obtain better tooth engagement force, the pawl structure 4 includes a double-toothed pawl 41 and a return spring 42, the tooth end of the double-toothed pawl 41 is bifurcated into double teeth, and the double teeth simultaneously mesh with the gear ring 2, the base end of the double-toothed pawl 41 is semi-cylindrical, the tower base body 3 is provided with an outer circular groove 33, the base end of the double-toothed pawl 41 is movably installed in the tower base outer circular groove 33, and the return spring 42 is also installed in the outer circular groove 33 of the tower base body 3, and the return spring 42 is set in abutment with the double-toothed pawl 41 so that the double-toothed pawl 41 maintains an outward posture. The tooth end of the pawl is divided into double teeth, which can mesh with the two inverted straight teeth 21 of the gear ring 2.

Furthermore, the number of teeth of the inverted beveled straight teeth 21 is 90T, and the single tooth meshing angle is 4 degrees.

Furthermore, nine outer circular grooves 33 are opened at the left end of the tower base body 3 , and nine double-toothed ratchet claws 41 are evenly spaced and distributed around the left end of the tower base body 3 .

Furthermore, the double-toothed pawls 41 are grouped into three (120°/pawl), namely the first pawl group 411, the second pawl group 412 and the third pawl group 413. The first pawl group 411, the second pawl group 412 and the third pawl group 413 are staggered by 1/3 teeth each, and the meshing angle is 4/3 degrees.

When the first pawl group 411 is engaged, the second pawl group 412 is engaged with a 1/3 tooth staggered angle, and the third pawl group 413 is engaged with a 2/3 tooth staggered angle; and when the second pawl group 412 is engaged, the third pawl group 413 is engaged with a 1/3 tooth staggered angle, and the first pawl group 411 is engaged with a 2/3 tooth staggered angle, and so on. Moreover, a sound is emitted every 4/3 degree of rotation (90*3=270 sounds are emitted for one rotation), which satisfies the advanced pursuit of cycling enthusiasts for dense tooth sounds.

This embodiment is provided with a double-toothed pawl, which meshes with the gear ring 2 at the same time, and the bite force is greatly enhanced compared with the traditional single-tooth, ensuring that the teeth are not easy to slip. The base end of the pawl is semi-cylindrical, and is movably installed in the outer circular groove 33 of the tower base body 3, and can be set to rotate in a small range. A return spring 42 is installed in the outer circular groove 33 of the tower base body 3. Under the action of the return spring 42, the pawl maintains an outward posture, ensuring that the tower base body 3 (tooth flywheel) always meshes with the gear ring 2 when rotating in the forward direction, driving the hub body 1 to rotate, thereby achieving the purpose of wheel rotation.

According to the use requirements, this application not only ensures the meshing strength of the gear ring and the pawl, but also achieves a small meshing angle, high meshing efficiency and reduced energy consumption, and satisfies the auditory feast of dense tooth sound. The installation of the freehub is smooth, which increases the service life of the hub and is safe and stable.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

The standard parts used in the utility model can all be purchased from the market, and special-shaped parts can be customized according to the instructions and the drawings. The specific connection methods of each part adopt the conventional means such as mature bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment all adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here.

In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims (6)

1. The utility model provides a ring gear and pawl optimization structure of bicycle flower-drum, its characterized in that, including flower-drum body, ring gear, tower base body, pawl structure and axle core, the ring gear excircle is provided with outer tooth line, and the flower-drum body is provided with interior tooth line, and ring gear and flower-drum body threaded connection set up until ring gear medial surface hugs closely this internal step side position of flower-drum, and ring gear inner circle evenly distributed has the straight tooth of anticlockwise, and tower base body is installed on flower-drum body right side, tower base body left side installation is provided with pawl structure, pawl structure and the interior circular meshing setting of ring gear wear to be equipped with the axle core in the flower-drum body, and the bearing is installed to the internal portion of tower base, the axle core right-hand member passes through the bearing and rotates with the tower base body to be connected.

2. The optimized structure of the gear ring and the pawl of the bicycle hub according to claim 1, wherein the right end of the tower base body is provided with an end cap, and the inner cavity of the end cap is sleeved with the right end face of the shaft core.

3. The optimized structure for the gear ring and the pawl of the bicycle hub according to claim 1, wherein the pawl structure comprises a double-tooth pawl and a return spring, the tooth ends of the double-tooth pawl are bifurcated into double teeth, the double teeth are simultaneously meshed with the gear ring, the base end of the double-tooth pawl is semi-cylindrical, the tower base body is provided with an outer circular groove, the base end of the double-tooth pawl is movably mounted in the tower base outer circular groove, the return spring is further mounted in the outer circular groove of the tower base body, and the return spring is in contact with the double-tooth pawl to enable the double-tooth pawl to maintain an outward-tensioning posture.

4. The optimized structure of a ring gear and a pawl for a bicycle hub according to claim 1, wherein the number of teeth of the inverted straight tooth is 90T, and the single tooth engagement angle is 4 degrees.

5. The optimized structure for the gear ring and the pawl of the bicycle hub according to claim 2, wherein nine outer circular grooves are formed in the left end of the tower base body, the number of the double-tooth pawls is nine, and the double-tooth pawls are evenly distributed around the left end of the tower base body at intervals.

6. The optimized structure of the gear ring and the pawl of the hub of the bicycle according to claim 5, wherein the three double-tooth pawls are a group, namely a first pawl group, a second pawl group and a third pawl group, each group of the first pawl group, the second pawl group and the third pawl group is staggered by 1/3 tooth, and the engagement angle is 4/3 degrees.