A frame of integral downtube front end support

Abstract

A kind of integrated middle tube front inclined support frame, including head tube, upper tube, middle tube, lower tube, vertical fork and flat fork, the upper end of upper tube and lower tube is connected to head tube, middle tube extends downward from the end of upper tube and is bent to be connected to the lower third of lower tube, the lower end of lower tube is connected with flat fork by five-way, one end of vertical fork is connected to the front of bending section of middle tube, and an integrated sheet-shaped support plate is arranged below the overlapping position of vertical fork and middle tube, and the end of vertical fork and flat fork is connected.The middle tube structure of the utility model advantageously reduces the vertical stiffness of middle tube when bicycle is in riding state, while basically maintaining or reducing the horizontal stiffness of bicycle in a small degree, such as lateral or torsional stiffness, so as to increase the comfort of rider.

Description

Technical Field

[0001] This utility model relates to the field of bicycle frames, and more particularly to a frame with an integrated center tube forward tilt support. Background Technology

[0002] A typical bicycle frame usually consists of a front triangle and a rear triangle. The front triangle typically includes the top tube, head tube, down tube, and bottom tube. The rear triangle typically includes a pair of top stays and a pair of chain stays. The bottom tube of a typical frame is directly connected to the bottom bracket, resulting in a rigid connection. This limits the frame's flexibility during riding or testing, and the riding experience for consumers needs improvement. Summary of the Invention

[0003] The present invention aims to address the shortcomings of the prior art by providing a frame with an integrated center tube forward tilt support.

[0004] To achieve the above objectives, this utility model adopts the following technical solution:

[0005] A frame with an integrated center tube tilt support includes a head tube, top tube, center tube, bottom tube, upright fork, and runner fork. The upper ends of the top tube and bottom tube are connected to the head tube. The center tube extends downward from the end of the top tube and bends before connecting to the lower third of the bottom tube. The lower end of the bottom tube is connected to the runner fork via a bottom bracket. One end of the upright fork is connected to the front of the bent section of the center tube. An integrated sheet-like support plate is provided below the overlap position between the upright fork and the center tube. The ends of the upright fork and the runner fork are connected.

[0006] The length of the straight section at the lower end of the curved section of the middle tube is the same as the length of the straight section at the lower end after the lower tube is connected to the middle tube, forming an isosceles triangle.

[0007] The cross-sectional shape of the middle tube gradually transitions from a circle at the top to an ellipse at the overlapping lower tube position.

[0008] The lower tube is an aluminum tube, and the middle tube is connected to the top surface of the aluminum tube, with the connecting cross-section of the middle tube being elliptical.

[0009] The sheet-like support plate includes a main board and fins. Two fins are symmetrically arranged on both sides of one end of the main board, and the two fins are respectively connected to the upright fork. The front end of the main board is a backward concave arc shape, and the arc-shaped front end of the main board is connected to the central tube.

[0010] The beneficial effects of this utility model are: the center tube structure of this utility model can effectively reduce the vertical stiffness of the center tube when the bicycle is being ridden, while basically maintaining or reducing the horizontal stiffness of the bicycle, such as lateral or torsional stiffness, to a small extent, thereby increasing the rider's comfort. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model;

[0012] Figure 2 This is a schematic diagram of the central tube structure of this utility model;

[0013] Figure 3 This is a schematic diagram of the sheet-like support plate structure of this utility model;

[0014] In the diagram: 1-Head tube; 2-Upper tube; 3-Middle tube; 4-Lower tube; 5-Upright fork; 6-Horizontal fork; 7-Bottom joint; 8-Sheet support plate; 81-Main board; 82-Fin plate;

[0015] The following will describe in detail the embodiments of this utility model with reference to the accompanying drawings. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0017] A frame with an integrated center tube and forward tilt support is characterized by comprising a head tube 1, an upper tube 2, a middle tube 3, a lower tube 4, a vertical fork 5, and a horizontal fork 6. The upper ends of the upper tube 2 and the lower tube 4 are connected to the head tube 1. The middle tube 3 extends downward from the end of the upper tube 2 and bends before connecting to the lower third of the lower tube 4. The lower end of the lower tube 4 is connected to the horizontal fork 6 via a bottom bracket 7. One end of the vertical fork 5 is connected to the front of the bent section of the middle tube 3, and an integrated sheet support plate 8 is provided below the overlap position of the vertical fork 5 and the middle tube 3. The sheet support plate 8 serves to increase strength and also provides a wind-breaking effect. The ends of the vertical fork 5 and the horizontal fork 6 are connected.

[0018] The length of the straight segment at the lower end of the curved section of the middle tube 3 is the same as the length of the straight segment at the lower end of the lower tube 2 after it is connected to the middle tube 3, forming an isosceles triangle.

[0019] The cross-sectional shape of the middle tube 3 gradually transitions from a circle at the top to an ellipse at the position where it overlaps with the lower tube 4, and gradually widens in appearance.

[0020] The lower tube 4 is an aluminum tube, and the middle tube 3 is connected to the top surface of the aluminum tube, and the connecting cross section of the middle tube 3 is elliptical.

[0021] The sheet-like support plate 8 includes a main plate 81 and fins 82. Two fins 82 are symmetrically arranged on both sides of one end of the main plate 81. The two fins 82 are respectively connected to the upright fork 5. The front end of the main plate 81 is concave arc-shaped and connected to the central tube 3.

[0022] During the riding test of this utility model, since the lower end of the middle tube 3 is connected to the lower third of the down tube 4, the vertical stiffness of the middle tube 3 is effectively reduced, while the horizontal stiffness of the bicycle, such as lateral and / or torsional stiffness, is maintained or reduced to a lesser extent, thereby increasing the rider's comfort. The frame of this utility model is not limited to aluminum alloy and steel materials.

[0023] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0025] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] The present invention has been described above with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any improvements made using the inventive concept and technical solution of the present invention, or direct application to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A frame with an integrated center tube forward tilt support, characterized in that, It includes a head tube (1), an upper tube (2), a middle tube (3), a lower tube (4), a vertical fork (5), and a horizontal fork (6). The upper ends of the upper tube (2) and the lower tube (4) are connected to the head tube (1). The middle tube (3) extends downward from the end of the upper tube (2) and bends to connect to the lower third of the lower tube (4). The lower end of the lower tube (4) is connected to the horizontal fork (6) through a bottom bracket (7). One end of the vertical fork (5) is connected to the front of the bent section of the middle tube (3), and an integrated sheet support plate (8) is set below the overlapping position of the vertical fork (5) and the middle tube (3). The ends of the vertical fork (5) and the horizontal fork (6) are connected.

2. The frame with an integrated center tube forward tilt support according to claim 1, characterized in that, The length of the straight section at the lower end of the curved section of the middle tube (3) is the same as the length of the straight section at the lower end of the lower tube (4) after it is connected to the middle tube (3), forming an isosceles triangle.

3. The frame with an integrated center tube forward tilt support according to claim 2, characterized in that, The cross-sectional shape of the middle tube (3) gradually transitions from a circle at the top to an ellipse at the position where it overlaps with the lower tube (4).

4. The frame with an integrated center tube forward tilt support according to claim 3, characterized in that, The lower tube (4) is an aluminum tube, the middle tube (3) is connected to the top surface of the aluminum tube, and the connecting cross section of the middle tube (3) is elliptical.

5. The frame with an integrated center tube forward tilt support according to claim 4, characterized in that, The sheet support plate (8) includes a main plate (81) and fins (82). Two fins (82) are symmetrically arranged on both sides of one end of the main plate (81). The two fins (82) are respectively connected to the upright fork (5). The front end of the main plate (81) is an arc shape that is concave towards the rear end. The arc-shaped front end of the main plate (81) is connected to the central tube (3).

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