Rear speed change lifting lug of bicycle

Abstract

The utility model relates to a bicycle rear speed change lifting lug which comprises a body made of titanium alloy, a barrel shaft rod positioning hole and a lifting lug fixing hole are formed in the top of the side face of the body, a rear chain changer fixing hole is formed in the bottom of the side face of the body, and the middle of the body is of a hollow structure. The rear speed change lifting lug of the bicycle is made of titanium alloy materials, has better rigidity in fierce use by optimizing a stress structure, and prevents gear skipping; when the chain encounters extreme tension, the tail hook can still keep the original position so as to prevent a transmission guide plate from twisting or deviating due to excessive tension of the chain, interference between the transmission guide plate and a driving side spoke is avoided, and hidden dangers are completely eradicated.

Description

Technical Field

[0001] The utility model belongs to the technical field of bicycles, and particularly relates to a rear speed-changing hanging eye of a bicycle. Background Art

[0002] The bicycle eye (tail hook) is fixed between the frame and the wheel hub. The actual force is the barrel axle rod tightening the embedded parts and the hub in the frame, pressing the eye (tail hook). The eye (tail hook) is used as a support point. The barrel axle structure of the disc brake frame will transmit greater force to the tail hook. The frame usually deforms during riding. Combined with the insufficient rigidity of the aluminum alloy tail hook material, intense riding will cause extrusion deformation and gear skipping. In daily use, when shifting to the maximum flywheel, the aluminum alloy eye (tail hook) will deform due to the peak chain tension, the angle of the rear derailleur guide plate will twist, and the guide plate will deviate from the original chain line and be close to the wheel spokes, causing hidden dangers. Utility Model Content

[0003] In view of this, the purpose of the utility model is to provide a bicycle rear gear hanging eye to address the deficiencies of the prior art, which, with a unique lightweight design, eliminates various safety hazards caused by metal fatigue of the aluminum alloy tail hook.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The rear gear-changing hanging ear of a bicycle comprises a main body made of titanium alloy, a barrel axle rod positioning hole and a hanging ear fixing hole are arranged on the top of the side surface of the main body, a rear chain device fixing hole is arranged on the bottom of the side surface of the main body, and the middle part of the main body is a hollow structure.

[0006] In order to better realize the utility model, further optimization is made in the above structure, and a reinforcing rib is arranged in the middle of the main body.

[0007] In order to better realize the utility model, further optimization is made in the above structure, and two reinforcing ribs are provided.

[0008] In order to better realize the utility model, further optimization is made in the above structure, and a lightweight groove is also opened on the top of the side of the main body.

[0009] In order to better realize the utility model, further optimization is made in the above structure, and multiple lightweight grooves are set and distributed along the circumference of the barrel shaft positioning hole.

[0010] In order to better realize the utility model, further optimization is made in the above structure, and the hanging ear fixing hole is a threaded hole.

[0011] In order to better implement the utility model, further optimization is made in the above structure, and the fixing hole of the rear chain changer is also a threaded hole.

[0012] In order to better realize the utility model, further optimization is made in the above structure, and the main body is made of nickel-titanium alloy.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] The rear transmission hanging eye of the bicycle provided by the utility model is made of titanium alloy, and has better rigidity in intense use by optimizing the force-bearing structure to prevent gear skipping; when the chain encounters extreme tension, the hanging eye (tail hook) can still maintain its original position to prevent the transmission guide plate from twisting or deviating from the proper chain line due to excessive chain tension, avoid interference with the drive side spokes, and eliminate hidden dangers; the nickel-titanium alloy material with memory properties is adopted, and in the case of a fall or normal collision, the force on the hanging eye (tail hook) will be quickly restored, and no hidden damage will be generated, no metal fatigue will occur, and no correction is required, thereby playing a role in protecting the frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is an axonometric view of the rear speed-changing hanging eye of the bicycle of the utility model;

[0017] Figure 2 This is a front view of the rear speed-changing hanging eye of a bicycle of the utility model;

[0018] Figure 3 It is a right side view of the rear speed-changing hanging eye of the bicycle of the utility model;

[0019] Figure 4 The utility model is a top view of a rear speed-changing hanging eye of a bicycle.

[0020] In the figure:

[0021] 1-main body, 101-axle rod positioning hole, 102-eye fixing hole, 103-rear chain derailleur fixing hole, 104-lightweight groove, 2-reinforcement ribs. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the utility model.

[0023] In the description of the present utility model, it should be noted that, unless otherwise specified, "multiple" means two or more; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present utility model. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0024] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" 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 a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0025] Reference Figure 1-Figure 4 The utility model provides a bicycle rear derailleur hanging ear, comprising a main body 1 made of titanium alloy, a barrel axle rod positioning hole 101 and a hanging ear fixing hole 102 are provided on the top side of the main body 1, a rear derailleur fixing hole 103 is provided on the bottom side of the main body 1, and the middle part of the main body 1 is a hollow structure. Two reinforcing ribs 2 are arranged in the middle part of the main body 1. The unique double reinforcing ribs and hollow structure eliminate the stress and vibration caused by the rear derailleur motor and increase the lateral pulling force. By optimizing the force-bearing structure, it has better rigidity during intense use and prevents gear skipping; when the chain encounters extreme tension, such as a large plate + a large flywheel, the hanging ear (tail hook) can still maintain its original position to prevent the transmission guide plate from twisting or deviating from the proper chain line due to excessive chain tension, avoid interference with the drive side spokes, and eliminate hidden dangers.

[0026] In order to better realize the utility model, further optimization is made in the above structure. A lightweight groove 104 is also opened on the top of the side of the main body 1. A plurality of lightweight grooves 104 are arranged and distributed along the circumference of the barrel shaft positioning hole 101. The high strength characteristics of titanium alloy are utilized to reduce the weight of the lifting ear (tail hook) while still maintaining excellent physical properties. The weight itself is lower than that of existing products made of aluminum alloy.

[0027] In order to better implement the utility model, the above structure is further optimized, the ear fixing hole 102 is a threaded hole, and the rear chain changer fixing hole 103 is also a threaded hole, which is convenient for fixing with fastening screws and easy installation and disassembly.

[0028] In order to better realize the utility model, further optimization is made in the above structure. The main body 1 is made of nickel-titanium alloy with memory properties. In the event of a fall or normal collision, the force on the lifting lug (tail hook) will recover quickly, no hidden damage will occur, no metal fatigue, and no correction is required. When impacted, the material properties of nickel-titanium alloy can enable the tail hook to instantly absorb the impact and recover, preventing the frame from touching the ground or breaking in the process. In the impact simulation scenario (60kg directly acts vertically on the fixed end of the transmission, and is pressed repeatedly 20 times in a row), the lifting lug (tail hook) will deform by about 1 / 2 gear each time, and the frame, the barrel axle embedded parts, and the tail hook will not be damaged.

[0029] During installation, the barrel axle rod is inserted into the barrel axle rod positioning hole 101, and then the tail hook is fixed to the frame using a screw through the ear fixing hole 102 on the top of the main body 1, and then the rear derailleur is locked on the rear chain device fixing hole 103 using a locking screw.

[0030] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A bicycle rear gearshift hanging eye, characterized by: The invention comprises a main body (1) made of titanium alloy, wherein a barrel shaft positioning hole (101) and a hanging ear fixing hole (102) are provided at the top of the side of the main body (1), a rear chain shifter fixing hole (103) is provided at the bottom of the side of the main body (1), and the middle part of the main body (1) is a hollow structure.

2. The bicycle rear gearshift hanging eye according to claim 1, characterized in that: A reinforcing rib (2) is provided in the middle of the main body (1).

3. The bicycle rear gearshift hanging eye according to claim 2, characterized in that: Two reinforcing ribs (2) are provided.

4. The bicycle rear gearshift hanging eye according to claim 3, characterized in that: A lightweight groove (104) is also provided on the top of the side surface of the main body (1).

5. The bicycle rear gearshift hanging eye according to claim 4, characterized in that: The lightweight grooves (104) are provided in plurality and are distributed along the circumference of the barrel shaft positioning hole (101).

6. The bicycle rear gearshift hanging eye according to claim 5, characterized in that: The hanging ear fixing hole (102) is a threaded hole.

7. The bicycle rear gearshift hanging eye according to claim 6, characterized in that: The rear chain changer fixing hole (103) is also a threaded hole.

8. The bicycle rear gearshift hanger according to any one of claims 1 to 7, characterized in that: The main body (1) is made of nickel-titanium alloy.

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