Hard tail frame structure of bicycle

Abstract

A hard tail frame structure of a bicycle is characterized in that a vertical pipe, an upper pipe, a head pipe and a lower pipe form a front triangular structure, the vertical pipe, a vertical fork and a flat fork form a rear triangular structure, and meanwhile, a supporting pipe is fixedly connected between the top of the upper pipe and the top of the vertical pipe to define a smaller triangular structure, so that a frame with three triangular structures is formed; the included angle at the intersection of the straight lines of the upper tube and the lower tube is set to be 17-35 degrees, and the included angle at the intersection of the straight lines of the vertical fork and the bottom fork is set to be 32-58 degrees, so that the deformation energy of the frame is tested through fixed loading force, and the frame at the moment has higher structural strength and deformation resistance; according to the bicycle frame, the deformation amplitude of the whole bicycle frame during riding can be effectively reduced, so that the force needed by a rider during riding is reduced, the pedaling propelling force of the whole bicycle can be more efficiently converted into the propelling force, and the effects that the bicycle frame is lighter at the same speed and faster at the same force are achieved.

Description

Technical Field

[0001] This utility model relates to bicycles, and more particularly to the structure of a hardtail frame for a bicycle. Background Technology

[0002] After more than a century of development, most bicycles now employ a double-triangle frame structure. Frames can be categorized into full-suspension frames and hardtail frames. A full-suspension frame has a shock-absorbing system between the links, while a hardtail frame uses fixed connections between the links. Current hardtail frame structures are as follows: Figure 1 As shown, the riser tube, top tube, head tube, and down tube form the front triangle near the front of the bike, while the riser tube, top fork, and swingarm form the rear triangle near the rear of the bike. At the same time, the riser tube, down tube, and swingarm are connected by a bottom bracket.

[0003] During riding, the rider converts the force exerted by pedaling into propulsive force through numerous components of the bicycle, including the pedals, cranks, bottom bracket, chainring, chain, freewheel, hubs, spokes, rims, and tires. The frame, as the main support for these components, experiences pressure from different parts and directions during riding. This pressure causes deformation of the frame and consumes some of the rider's work, thus reducing the bicycle's maximum speed or requiring more energy to maintain the same speed. Utility Model Content

[0004] The purpose of this invention is to provide a bicycle hardtail frame structure that can improve frame strength and reduce deformation, thereby reducing the strength required for riding and increasing riding speed.

[0005] The bicycle hardtail frame structure of this utility model includes a seat tube, an upper tube and a lower tube disposed on one side of the seat tube, and a vertical fork and a horizontal fork disposed on the other side of the seat tube; one end of the upper tube and the vertical fork is fixedly connected to the middle of the seat tube, one end of the lower tube and the horizontal fork is fixedly connected to the bottom of the seat tube through a bottom bracket, the other ends of the upper tube and the lower tube are fixedly connected through a head tube, and the other ends of the vertical fork and the horizontal fork are fixedly connected to each other; a support tube is fixedly connected between the top of the upper tube and the top of the seat tube, the included angle between the upper tube and the lower tube is 17° to 35°, and the included angle between the vertical fork and the horizontal fork is 32° to 58°.

[0006] The utility model discloses a bicycle hard tail frame structure, and upper pipe and lower pipe are installed to the one side of vertical pipe towards the head of the car, and the length of the head tube of the other end connection of upper pipe and lower pipe is shorter, and the inside formed by vertical pipe, upper pipe, lower pipe and head tube forms the structure of approximate triangle, and the other side of vertical pipe is connected with vertical fork and flat fork, and the three form the triangle structure, and the support pipe is also connected between upper pipe and vertical pipe, and the vertical pipe, upper pipe and support pipe also form a smaller triangle structure, and the frame with three triangle supports is formed, and the structural strength of the whole frame is improved, and in addition, the angle of intersection of the straight line of upper pipe and lower pipe is 17 to 35 DEG, and the angle of intersection of the straight line of vertical fork and flat fork is 32 to 58 DEG, and when riding the bicycle, the pressure of the front and rear sides of the frame will have part pointing to the small triangle, and the deformation support is provided by the pipe of small triangle part, thereby reducing the deformation amplitude of the whole frame, and further reducing the force required by the rider, and the required strength of riding is reduced, or in the same strength riding state, the faster riding speed can be reached.

[0007] Preferably, the horizontal height of the vertical fork connection end of the vertical pipe is higher than the horizontal height of the upper pipe connection end of the vertical pipe, and the angle between the upper pipe and the lower pipe is 21 to 22 DEG.

[0008] Preferably, the horizontal height of the vertical fork connection end of the vertical pipe is not higher than the horizontal height of the upper pipe connection end of the vertical pipe, and the angle between the upper pipe and the lower pipe is 28 to 29 DEG.

[0009] Preferably, the horizontal height of the vertical fork connection end of the vertical pipe is higher than the horizontal height of the upper pipe connection end of the vertical pipe, and the angle between the vertical fork and the flat fork is 39 to 41 DEG.

[0010] Preferably, the horizontal height of the vertical fork connection end of the vertical pipe is not higher than the horizontal height of the upper pipe connection end of the vertical pipe, and the angle between the vertical fork and the flat fork is 48 to 50 DEG.

[0011] Through the setting of the bicycle hard tail frame structure, the structural strength and deformation resistance of the frame can be effectively improved, thereby reducing the riding energy consumption, and the propelling force of the whole vehicle can be more efficiently converted into propelling force, and the effect of the same speed is lighter and the same force is faster is realized. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is the structural schematic diagram of bicycle hard tail frame structure.

[0013] Figure 2 It is the schematic diagram of the angle between upper pipe and lower pipe, vertical fork and flat fork.

[0014] Figure 3 It is the angle-deformation energy change graph of the hard tail frame of different angle of upper pipe and lower pipe under the force test of specific loading.

[0015] Figure 4 The angle-deformation energy change graph is obtained by stress testing of the hard-tail frame with different angles between the vertical fork and the horizontal fork under a specific loading force. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0017] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications also change accordingly.

[0018] If the embodiments of the present application involve descriptions of "first" or "second" and the like, the descriptions of "first" or "second" and the like are only for description purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features with "first" or "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of the various embodiments can be combined with each other, but must be based on the fact that a person skilled in the art can realize it, and when the combination of technical solutions appears to be contradictory or unachievable, it should be considered that the combination of technical solutions does not exist and is not within the scope of protection required by the present application.

[0019] The present application provides a bicycle hard-tail frame structure.

[0020] The bicycle hard-tail frame structure of the present application comprises a vertical pipe 1, an upper pipe 2 and a lower pipe 3 arranged on one side of the vertical pipe, and a vertical fork 4 and a horizontal fork 5 arranged on the other side of the vertical pipe; one end of the upper pipe and the vertical fork is fixedly connected to the middle part of the vertical pipe, one end of the lower pipe and the horizontal fork is fixedly connected to the bottom of the vertical pipe through a five-way pipe 6, the other end of the upper pipe and the lower pipe is fixedly connected through a head pipe 7, and the other end of the vertical fork and the horizontal fork is fixedly connected to each other; a support pipe 8 is fixedly connected between the upper pipe and the top of the vertical pipe, the included angle between the upper pipe and the lower pipe is 17°-35°, and the included angle between the vertical fork and the horizontal fork is 32°-58°.

[0021] As Figure 1As shown, the upper tube and the lower tube are installed on the side of the vertical tube facing the vehicle head, and the head tube connected to the other end of the upper tube and the lower tube is short in length, so that the inside surrounded by the vertical tube, the upper tube, the lower tube and the head tube forms a triangular structure; while the vertical tube is connected to the stand fork and the flat fork on the other side, and a triangular structure is formed among the three; meanwhile, the support tube is connected between the upper tube and the vertical tube, so that the vertical tube, the upper tube and the support tube also form a smaller triangular structure; thus a frame with three triangular supports is formed, which improves the structural strength of the entire frame; as shown in Figure 2 As shown, the angle α between the straight lines where the upper tube and the lower tube intersect is 17°-35°, and the angle β between the straight lines where the stand fork and the flat fork intersect is 32°-58°, and during cycling, the pressure on the front and rear sides of the frame will be partially directed to the small triangle.

[0022] The frame is subjected to force testing, for example, using the frame rigidity testing device with publication number CN220854468U, combined with the Finite Element Analysis method, to measure the deformation energy of the frame under a certain load, and frames with different angles and sizes of the upper tube, stand fork and vertical tube connection positions are measured. The relationship between the angle of the upper tube and the lower tube and the deformation energy is shown in Figure 3 As shown in the figure, curve A represents that the connection end of the stand fork and the vertical tube and the connection end of the upper tube and the vertical tube are set at the same height, curve B represents that the end of the stand fork is higher than the upper tube, and curve C represents that the end of the stand fork is lower than the upper tube; through testing, it is known that when the horizontal height of the connection end of the stand fork 4 and the vertical tube 1 is higher than the horizontal height of the connection end of the upper tube 2 and the vertical tube, the angle between the upper tube 2 and the lower tube 3 is preferably 21°-22°; and when the horizontal height of the connection end of the stand fork 4 and the vertical tube 1 is not higher than the horizontal height of the connection end of the upper tube 2 and the vertical tube, the angle between the upper tube 2 and the lower tube 3 is preferably 28°-29°. The relationship between the angle of the stand fork and the flat fork and the deformation energy is shown in Figure 4 As shown, when the horizontal height of the connection end of the stand fork 4 and the vertical tube 1 is higher than the horizontal height of the connection end of the upper tube 2 and the vertical tube, the angle between the stand fork 4 and the flat fork 5 is preferably 39°-41°; and when the horizontal height of the connection end of the stand fork 4 and the vertical tube 1 is not higher than the horizontal height of the connection end of the upper tube 2 and the vertical tube, the angle between the stand fork 4 and the flat fork 5 is preferably 48°-50°. Through the setting of this structure, the deformation energy of the frame is minimized or close to the minimum, at which time the structural strength and deformation resistance of the frame can be more effectively improved, thereby reducing the cycling energy consumption, so that the propulsion force of the entire vehicle can be more efficiently converted into propulsion force, achieving the effect of lighter speed and faster force.

[0023] The above merely describes preferred embodiments of the present application, and is not intended to limit the patent scope of the present application, and any equivalent structural transformation or direct / indirect application in other related technical fields under the inventive concept of the present application, as described in the present application specification and drawings, is included in the patent protection scope of the present application.

Claims

1. A bicycle hard-tail frame structure comprising a vertical tube (1), and an upper tube (2) and a lower tube (3) arranged on one side of the vertical tube, and a vertical fork (4) and a horizontal fork (5) arranged on the other side of the vertical tube; one end of the upper tube and the vertical fork is fixedly connected to the middle part of the vertical tube, one end of the lower tube and the horizontal fork is fixedly connected to the bottom of the vertical tube through a five-way tube (6), the other end of the upper tube and the lower tube is fixedly connected through a head tube (7), and the other end of the vertical fork and the horizontal fork is fixedly connected to each other, characterized in that: The support pipe (8) is fixedly connected between the upper pipe and the top of the vertical pipe, the included angle between the upper pipe and the lower pipe is 17-35 degrees, and the included angle between the vertical prong and the horizontal prong is 32-58 degrees.

2. The bicycle hardtail frame structure of claim 1, wherein: The horizontal height of the connection end of the vertical prong (4) and the vertical pipe (1) is higher than that of the connection end of the upper pipe (2) and the vertical pipe, and the included angle between the upper pipe (2) and the lower pipe (3) is 21-22 degrees.

3. The bicycle hardtail frame structure of claim 1, wherein: The horizontal height of the connection end of the vertical prong (4) and the vertical pipe (1) is not higher than that of the connection end of the upper pipe (2) and the vertical pipe, and the included angle between the upper pipe (2) and the lower pipe (3) is 28-29 degrees.

4. Bicycle hardtail frame structure according to claim 1 or 2, characterized in that: The horizontal height of the connection end of the vertical prong (4) and the vertical pipe (1) is higher than that of the connection end of the upper pipe (2) and the vertical pipe, and the included angle between the vertical prong (4) and the horizontal prong (5) is 39-41 degrees.

5. The bicycle hardtail frame structure of claim 1 or 3, characterized in that: The horizontal height of the connection end of the vertical prong (4) and the vertical pipe (1) is not higher than that of the connection end of the upper pipe (2) and the vertical pipe, and the included angle between the vertical prong (4) and the horizontal prong (5) is 48-50 degrees.

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