A lightweight frame for a road bicycle

Abstract

The utility model provides a light weight frame of highway bicycle relates to bicycle technical field, and disclose including saddle support pipe, the butt joint subassembly is fixedly installed to saddle support pipe bottom, the butt joint subassembly is inserted with pedal connecting pipe, the butt joint subassembly front side fixedly installed has front inclined pipe, the arc support pipe is fixedly installed to saddle support pipe upper half portion front side, the front inclined pipe and arc support pipe front end are connected through handlebar sleeve pipe, the butt joint subassembly rear side fixedly installed has two bottom crossbeam, saddle support pipe upper half portion rear side fixedly installed has two inclined pull rod, the bottom crossbeam and inclined pull rod rear end are mutually connected. Through holding in the rotary arm rotation, drive pivot and bevel gear two rotation, thereby drive bevel gear one and threaded rod rotation, cooperate strip inner recess and convex strip's guiding effect to saddle fixed pipe, drive saddle fixed pipe to move up or down, thereby saddle fixed pipe moving speed is more stable, reach the purpose that the height of convenient adjustment saddle.

Description

Technical Field

[0001] This utility model relates to the field of bicycle technology, specifically a lightweight frame for a road bicycle. Background Technology

[0002] Road cycling is a sub-discipline of cycling events. The requirements for bicycles in these races include: a total length not exceeding 185 cm, a width not exceeding 50 cm, and a weight of at least 6.8 kg. The seat length should be between 24-30 cm, the distance between the bottom bracket and the ground should be between 24-30 cm, and the front and rear wheel diameters must be the same. The maximum wheel diameter is 70 cm, and the minimum is 55 cm. To reduce rolling resistance, the frame material is typically improved to reduce weight. Common materials for road bicycle frames include carbon fiber and aluminum alloy.

[0003] Chinese patent CN221477384U, filed on March 6, 2024, discloses a carbon fiber bicycle frame, including: a carbon fiber frame with a longitudinal connecting rod; a pedal sleeve fixedly connected to one end of the longitudinal connecting rod; a crossbar fixedly connected to one side of the longitudinal connecting rod; a front slant bar fixedly connected to one side of the pedal sleeve; a connecting anti-compression component sleeved on the outside of the pedal sleeve; a rear slant bar fixedly connected to the other side of the longitudinal connecting rod; a rear fork fixedly connected to the other side of the pedal sleeve; a head tube fixedly connected to one end of the crossbar; a rear wheel mount fixedly connected to one end of the rear slant bar; and an inner anti-compression disc inside the crossbar, with a limit screw threaded through the inner anti-compression disc. This technical solution solves the problem of poor anti-compression performance in existing carbon fiber bicycle frames during use, which may lead to frame damage or breakage.

[0004] When adjusting the height of a bicycle seat in the conventional way, the seat is usually raised or lowered by hand after unlocking the limiting device, and then the limiting device stops the seat height. In this process, the seat can easily rise or fall too much, requiring multiple fine adjustments, which makes seat height adjustment quite cumbersome and warrants further improvement. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] In view of the shortcomings of the existing technology, this utility model provides a lightweight frame for road bicycles, which has the advantages of easy seat height adjustment and solves the problem of the cumbersome seat height adjustment.

[0007] (II) Technical Solution

[0008] To achieve the aforementioned goal of facilitating seat height adjustment, this utility model provides the following technical solution: a lightweight frame for a road bicycle, comprising a seat support tube, a docking assembly fixedly installed at the bottom of the seat support tube, a pedal connecting tube inserted into the docking assembly, a front slant tube fixedly installed at the front of the docking assembly, an arc-shaped support tube fixedly installed at the front of the upper half of the seat support tube, the front slant tube and the arc-shaped support tube being connected at their front ends via a handlebar sleeve, two bottom crossbeams fixedly installed at the rear of the docking assembly, two diagonal tie rods fixedly installed at the rear of the upper half of the seat support tube, and the rear ends of the bottom crossbeams and the diagonal tie rods being interconnected.

[0009] Preferably, the docking assembly includes two annular seats, which are sleeved on the outside of the pedal connecting tube. Each of the two annular seats has a boss on its opposite side and a groove on its opposite side. The boss and the groove are fitted together. A positioning post one is fixedly installed on the outer wall of the boss, and a positioning post two is fixedly installed on the rear outer wall of the annular seat.

[0010] Preferably, the two annular seats are fixed together by welding, the seat support tube is sleeved on one of the positioning posts, and the bottom end of the seat support tube is fixed to the annular seat by welding. The front inclined tube is sleeved on the other positioning post, and the bottom end of the front inclined tube is fixed to the annular seat by welding. The two bottom crossbeams are sleeved on the outside of the two positioning posts, and the front end of the bottom crossbeams is fixed to the annular seat by welding.

[0011] Preferably, the arc-shaped support tube arches upward, and an inner lining strip is fixedly installed inside the arc-shaped support tube, the inner lining strip being wavy.

[0012] Preferably, both ends of the arc-shaped support tube are provided with connectors, and the arc-shaped support tube is connected to the seat support tube and the handlebar sleeve tube respectively through the connectors; the connectors include a butt arc plate welded to the end of the arc-shaped support tube, and both ends of the butt arc plate are fitted with reinforcing rings, and an arc-shaped pad is fixedly installed on the inner wall of the reinforcing ring.

[0013] Preferably, a seat fixing tube is inserted into the top end of the seat support tube, and a strip-shaped concave portion is provided on the circumference of the seat fixing tube. A convex strip is fixedly installed on the inner wall of the seat support tube, and the seat fixing tube is slidably connected to the convex strip through the strip-shaped concave portion. A sealing plate is fixedly installed at the bottom end of the seat fixing tube, and a threaded rod is threadedly connected to the center of the sealing plate. A bushing is rotatably connected to the bottom end of the threaded rod, and the bushing is fixedly installed on a positioning post. A rotation drive component is provided at the bottom end of the threaded rod.

[0014] Preferably, the rotation drive component includes a bevel gear one fixedly installed on the circumferential surface of the bottom end of the threaded rod, a bevel gear two meshing with the front side of the bevel gear one, a rotating shaft fixedly installed at the center of the front side of the bevel gear two, a rotating arm hinged to the front end of the rotating shaft, and a retaining strip fixedly installed on the circumferential surface of the bottom end of the seat support tube, the retaining strip being engaged with the bottom end of the rotating arm.

[0015] (III) Beneficial Effects

[0016] Compared with the prior art, this utility model provides a lightweight frame for road bicycles, which has the following advantages:

[0017] The lightweight frame of this road bicycle rotates by gripping the swingarm, which in turn rotates the axle and bevel gear two, thereby rotating bevel gear one and the threaded rod. Combined with the guiding effect of the strip-shaped concave part and the convex rib, the seat post moves up or down. Since the moving speed of the seat post is directly proportional to the rotation speed of the swingarm, the moving speed of the seat post is relatively stable, making it easy to adjust the seat height. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0019] Figure 2 This is a three-dimensional structural diagram of the docking assembly and pedal connecting pipe of this utility model;

[0020] Figure 3 This is a three-dimensional structural diagram of the arc-shaped support tube of this utility model;

[0021] Figure 4 This is a bottom-view perspective view of the three-dimensional structure of the seat fixing tube of this utility model.

[0022] Figure 5 This is a top-view three-dimensional structural diagram of the seat fixing tube of this utility model.

[0023] In the diagram: 100, seat support tube; 200, docking assembly; 300, pedal connecting tube; 400, front slant tube; 500, curved support tube; 600, handlebar sleeve; 700, bottom crossbeam; 800, tie rod; 900, seat fixing tube;

[0024] 201. Annular seat; 202. Boss; 203. Groove; 204. Positioning pin one; 205. Positioning pin two;

[0025] 501. Inner lining strip; 502. Butt joint arc plate; 503. Reinforcing ring; 504. Arc-shaped pad;

[0026] 901. Strip-shaped concave part; 902. Raised strip; 903. Sealing plate; 904. Threaded rod; 905. Bushing; 906. Bevel gear one; 907. Bevel gear two; 908. Rotating shaft; 909. Rotating arm; 910. Clamping strip. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Please see Figures 1-5 A lightweight road bicycle frame, made entirely of aluminum alloy, is disclosed. It includes a seat support tube 100, a connecting assembly 200 fixedly mounted at its bottom, a pedal connecting tube 300 inserted into the connecting assembly 200, a front slant tube 400 fixedly mounted at the front of the connecting assembly 200, and an arc-shaped support tube 500 fixedly mounted at the front of the upper half of the seat support tube 100. The front ends of the front slant tube 400 and the arc-shaped support tube 500 are connected by a handlebar sleeve 600. Two bottom crossbeams 700 are fixedly mounted at the rear of the connecting assembly 200, and two diagonal braces 800 are fixedly mounted at the rear of the upper half of the seat support tube 100. The rear ends of the bottom crossbeams 700 and the diagonal braces 800 are interconnected.

[0029] The docking assembly 200 includes two annular seats 201, which are sleeved on the outside of the pedal connecting tube 300 and then fixed together by welding. Each of the two annular seats 201 has a boss 202 on one side and a groove 203 on the other side, which are fitted together to ensure a tight fit.

[0030] Positioning pin 1 204 is fixedly installed on the outer wall of the boss 202, and positioning pin 205 is fixedly installed on the rear outer wall of the annular seat 201. The seat support tube 100 is fitted onto one of the positioning pins 1 204, and its bottom end is welded to the annular seat 201. The front inclined tube 400 is fitted onto the other positioning pin 1 204, and its bottom end is welded to the annular seat 201. The two positioning pins 1 204 are used to position the seat support tube 100 and the front inclined tube 400, respectively. Two bottom crossbeams 700 are fitted onto the outside of the two positioning pins 205, and their front ends are welded to the annular seat 201. The two positioning pins 205 are used to position the bottom crossbeams 700.

[0031] The curved support tube 500 arches upwards, improving its compressive strength. An inner lining strip 501, which is wavy, is fixedly installed inside the curved support tube 500, further enhancing its compressive strength. Connectors are provided at both ends of the curved support tube 500, connecting it to the seat support tube 100 and the handlebar sleeve 600 respectively. The connectors include a butt-joint arc plate 502 welded to the end of the curved support tube 500, with reinforcing rings 503 fitted at both ends of the butt-joint arc plate 502. An arc-shaped pad 504 is fixedly installed on the inner wall of the reinforcing ring 503. The reinforcing rings 503 are then fixed to the butt-joint arc plate 502 by welding. The butt-joint arc plate 502, reinforcing rings 503, and arc-shaped pad 504 facilitate the assembly of the curved support tube 500 onto the handlebar sleeve 600 and the seat support tube 100.

[0032] A seat fixing tube 900 is inserted into the top of the seat support tube 100. A strip-shaped concave portion 901 is provided on the circumference of the seat fixing tube 900. A protruding strip 902 is fixedly installed on the inner wall of the seat support tube 100. The seat fixing tube 900 is slidably connected to the protruding strip 902 through the strip-shaped concave portion 901, which suppresses the rotation of the seat fixing tube 900 inside the seat support tube 100.

[0033] A sealing plate 903 is fixedly installed at the bottom end of the seat fixing tube 900. A threaded hole is opened at the center of the sealing plate 903. A threaded rod 904 is threadedly connected at the center of the sealing plate 903. A bushing 905 is rotatably connected to the bottom end of the threaded rod 904. An annular flange is provided at the bottom end of the threaded rod 904. The bushing 905 has an L-shaped cross-section and is fixedly installed on the positioning post 204, so that the threaded rod 904 is stably rotatably connected to the positioning post 204.

[0034] A rotation drive component is provided at the bottom end of the threaded rod 904. The rotation drive component includes a bevel gear 906 fixedly mounted on the circumferential surface of the bottom end of the threaded rod 904. A bevel gear 907 meshes with the front side of the bevel gear 906. A rotating shaft 908 is fixedly mounted at the center of the front side of the bevel gear 907. A rotating arm 909 is hinged to the front end of the rotating shaft 908. By rotating the rotating arm 909 by hand, the rotating shaft 908 and the bevel gear 907 are driven to rotate, thereby driving the bevel gear 906 and the threaded rod 904 to rotate. A retaining strip 910 is fixedly mounted on the circumferential surface of the bottom end of the seat support tube 100. The retaining strip 910 engages with the bottom end of the rotating arm 909. Thus, after the threaded rod 904 is driven to rotate, the retaining strip 910 limits the rotation of the rotating arm 909, inhibiting its rotation.

[0035] In use, by holding the rotating arm 909 and rotating it, the rotating shaft 908 and the second bevel gear 907 are driven to rotate, which in turn drives the first bevel gear 906 and the threaded rod 904 to rotate. In conjunction with the guiding effect of the strip-shaped concave part 901 and the convex part 902 on the seat fixing tube 900, the seat fixing tube 900 is driven to move up or down. Since the moving speed of the seat fixing tube 900 is directly proportional to the rotation speed of the rotating arm 909, the moving speed of the seat fixing tube 900 is relatively stable.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A lightweight frame for a road bicycle, comprising a seat support tube (100), characterized in that: A docking assembly (200) is fixedly installed at the bottom of the seat support tube (100). A pedal connecting tube (300) is inserted into the docking assembly (200). A front slant tube (400) is fixedly installed on the front side of the docking assembly (200). An arc-shaped support tube (500) is fixedly installed on the front side of the upper half of the seat support tube (100). The front ends of the front slant tube (400) and the arc-shaped support tube (500) are connected by a handlebar sleeve (600). Two bottom crossbeams (700) are fixedly installed on the rear side of the docking assembly (200). Two diagonal braces (800) are fixedly installed on the rear side of the upper half of the seat support tube (100). The rear ends of the bottom crossbeams (700) and the diagonal braces (800) are connected to each other.

2. The lightweight frame of a road bicycle according to claim 1, characterized in that: The docking assembly (200) includes two annular seats (201), which are sleeved on the outside of the pedal connecting tube (300). Each of the two annular seats (201) has a boss (202) on one side and a groove (203) on one side. The boss (202) and the groove (203) are adapted to be inserted into each other. A positioning post one (204) is fixedly installed on the outer wall of the boss (202), and a positioning post two (205) is fixedly installed on the rear outer wall of the annular seat (201).

3. The lightweight frame of a road bicycle according to claim 2, characterized in that: The two annular seats (201) are fixed together by welding. The seat support tube (100) is sleeved on one of the positioning posts (204). The bottom end of the seat support tube (100) is fixed to the annular seat (201) by welding. The front inclined tube (400) is sleeved on the other positioning post (204). The bottom end of the front inclined tube (400) is fixed to the annular seat (201) by welding. The two bottom crossbeams (700) are sleeved on the outside of the two positioning posts (205). The front end of the bottom crossbeams (700) is fixed to the annular seat (201) by welding.

4. The lightweight frame of a road bicycle according to claim 1, characterized in that: The arc-shaped support tube (500) arches upward, and an inner lining strip (501) is fixedly installed inside the arc-shaped support tube (500). The inner lining strip (501) is wavy.

5. The lightweight frame of a road bicycle according to claim 4, characterized in that: Both ends of the arc-shaped support tube (500) are provided with connectors, and the arc-shaped support tube (500) is connected to the seat support tube (100) and the handlebar sleeve (600) respectively through the connectors; The connector includes a butt arc plate (502) welded to the end of the arc-shaped support tube (500), and a reinforcing ring (503) is sleeved on both ends of the butt arc plate (502). An arc-shaped pad (504) is fixedly installed on the inner wall of the reinforcing ring (503).

6. The lightweight frame of a road bicycle according to claim 1, characterized in that: A seat fixing tube (900) is inserted into the top end of the seat support tube (100). A strip-shaped concave portion (901) is provided on the circumference of the seat fixing tube (900). A convex strip (902) is fixedly installed on the inner wall of the seat support tube (100). The seat fixing tube (900) is slidably connected to the convex strip (902) through the strip-shaped concave portion (901). A sealing plate (903) is fixedly installed at the bottom end of the seat fixing tube (900). A threaded rod (904) is threadedly connected at the center of the sealing plate (903). A bushing (905) is rotatably connected at the bottom end of the threaded rod (904). The bushing (905) is fixedly installed on the positioning post (204). A rotation drive component is provided at the bottom end of the threaded rod (904).

7. The lightweight frame of a road bicycle according to claim 6, characterized in that: The rotating drive component includes a bevel gear one (906) fixedly installed on the bottom circumferential surface of the threaded rod (904), a bevel gear two (907) meshing with the front side of the bevel gear one (906), a rotating shaft (908) fixedly installed at the center of the front side of the bevel gear two (907), a rotating arm (909) hinged to the front end of the rotating shaft (908), and a retaining strip (910) fixedly installed on the bottom circumferential surface of the seat support tube (100), the retaining strip (910) being engaged with the bottom end of the rotating arm (909).

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