A bicycle light-weight shock-absorbing seat tube mechanism

Abstract

A bicycle light weight shock absorption seat tube mechanism, including: inner tube, outer tube, inner thread sleeve, set screw, bellows, bottom plate, inner tube upper end circumscribes seat cushion mechanism, inner tube lower end is connected with bottom plate, bottom plate is connected with bellows lower end, bellows upper end is connected with inner thread sleeve, set screw is located in inner thread sleeve screw hole, inner thread sleeve is sleeved with outer tube lower end outer thread, and outer tube inner hole is sleeved with inner tube outer side. The utility model replaces metal material with light weight material, replaces four shock absorbers with seat tube mechanism, and shock absorption and light weight are considered; the utility model places bottom plate under five tunnels, wheel shaft hole A and wheel shaft hole B of frame, so that the gravity center of rider is lowered below wheel shaft hole, the gravity center is lowered, stability is improved, and the weight of vehicle body is not increased.

Description

Technical Field

[0001] This utility model belongs to the field of bicycle seat post technology, specifically relating to a lightweight shock-absorbing bicycle seat post mechanism. Background Technology

[0002] Common bicycle frames can be classified by material into aluminum alloy frames, steel frames, titanium alloy frames, and carbon composite frames. Carbon composite frames are made of composite materials composed of carbon fiber and other filler materials. They are lightweight and highly elastic (with good shock absorption). Their weight is only half that of aluminum alloy frames of the same specifications, but they have the strength of high-carbon steel. They are suitable for long-distance riding and are well adapted to the development trend of green and healthy cycling.

[0003] However, due to the excessive lightweighting of the carbon composite frame, the entire frame weighs only a few kilograms, resulting in a high center of gravity for the rider, affecting stability and reducing safety during sudden braking and sharp turns. While lowering the seatpost and saddle height can lower the rider's center of gravity and improve stability, the saddle height must be determined according to the rider's leg length. If the saddle is too low, the rider's legs cannot be fully extended, affecting comfort. The balance between riding comfort and stability has become a difficult contradiction for the seatpost mechanism to resolve.

[0004] To lower the center of gravity, improve stability, and maintain comfort, some manufacturers have installed a pair of spring or hydraulic shock absorbers at the front and rear forks of the bicycle frame as counterweights to lower the frame's center of gravity. Current bicycle seatpost mechanisms use a clamping mechanism for locking, relying on friction to limit the movement of the inner tube by deforming the outer tube. However, this locking effect is poor under bumpy conditions. Furthermore, carbon-based composite materials have lower toughness and plasticity than metal materials, making them more prone to cracking under fatigue and impact load conditions. The clamping position has become a bottleneck for the fatigue strength of the seatpost mechanism, making the shock absorption effect of the shock absorbers crucial. However, the total weight of the two pairs of shock absorbers can even exceed the weight of the carbon composite frame, significantly compromising the frame's lightweight design and contradicting the trend of promoting green and healthy cycling through bicycle weight reduction. Moreover, due to the obstruction of the wheel axle, both pairs of shock absorbers are located above the wheel axle, keeping the rider's center of gravity above the wheel axle and failing to effectively lower it. Utility Model Content

[0005] To overcome the shortcomings of existing technologies, a lightweight, shock-absorbing seatpost mechanism for bicycles is provided, which is lightweight, has good shock absorption, and can effectively lower the rider's center of gravity.

[0006] The present invention provides a lightweight shock-absorbing seat post mechanism for bicycles, comprising: an inner tube, an outer tube, an internally threaded sleeve, a set screw, a bellows, and a base plate. The upper end of the inner tube is connected to a seat cushion mechanism, and the lower end of the inner tube is centered and connected to the base plate. The outer edge of the base plate is connected to the lower end of the bellows, and the upper end of the bellows is connected to the internally threaded sleeve. The set screw is located in a screw hole on the wall of the internally threaded sleeve. The internally threaded sleeve is fitted onto the external thread at the lower end of the outer tube, and the inner hole of the outer tube is fitted onto the outer side of the inner tube, forming a sliding pair.

[0007] The lower end of the outer tube is provided with external threads.

[0008] A screw hole is provided in the middle of the wall of the internally threaded sleeve.

[0009] Both the inner and outer tubes are made of carbon fiber reinforced polypropylene, and their bonding surfaces are grease-lubricated, with the grease being a mixture of silicon-based grease and graphite powder.

[0010] The corrugated pipe is a carbon fiber / glass fiber mixed-filled nylon elastomer.

[0011] The set screw is made of glass fiber filled nylon and has an interference thread.

[0012] This invention places the base plate under the bottom bracket, wheel axle hole A, and wheel axle hole B of the frame, thereby lowering the rider's center of gravity below the wheel axle hole, reducing the center of gravity, improving stability, and without increasing the weight of the vehicle.

[0013] This invention utilizes a carbon fiber reinforced polypropylene outer tube to replace the metal sleeve of the shock absorber, a carbon fiber reinforced polypropylene inner tube to replace the metal strut of the shock absorber, and a nylon elastomer corrugated tube to replace the compression spring of the shock absorber, integrating the seat post mechanism and the shock absorber into one highly integrated unit. This reduces the number of shock absorber components and uses lightweight materials to replace metal materials, achieving a lightweight improvement in the shock absorber. When the vehicle bumps, the fluctuating load generated by the rider's weight is damped by the seat post mechanism before being transmitted to the frame, thus replacing four shock absorbers with the seat post mechanism and further achieving a lightweight bicycle design.

[0014] When adjusting the height of the seat cushion mechanism, first loosen the set screw of the seat post mechanism, then rotate the inner tube. By raising and lowering the inner tube, adjust the height of the seat cushion mechanism. After the height of the seat cushion mechanism is adjusted to the correct position, straighten the seat cushion mechanism and tighten the set screw. This will limit the movement of the outer and inner tubes and prevent the inner tube from rotating. The set screw is made of glass fiber filled nylon with an interference thread, which has strong resilience and good anti-loosening effect. No clamping mechanism is required, and the fatigue strength of the outer and inner tubes is effectively improved.

[0015] Compared with the existing technology, the present invention has the following advantages:

[0016] This invention offers excellent lightweight performance. It integrates the seatpost mechanism and shock absorber into one highly integrated unit, reducing the number of shock absorber components. Lightweight materials replace metal materials, and the seatpost mechanism replaces four shock absorbers, effectively reducing weight. It balances shock absorption and lightweight design, which aligns better with the trend of promoting green and healthy cycling through lightweight bicycles.

[0017] This invention effectively lowers the rider's center of gravity. The base plate is located below the bottom bracket and wheel axle holes A and B on the frame. The upper part of the base plate is connected to the lower end of the inner tube, and the upper end of the inner tube is connected to the saddle mechanism. The rider's weight is pressed onto the base plate at the lower end of the seat post mechanism through the saddle mechanism and the inner tube, and the center of gravity is lowered below the wheel axle, which effectively improves stability and ensures safety during sudden braking and sharp turns.

[0018] This invention allows for adjustment of the seat cushion height by rotating the inner tube. The set screw limits the outer and inner tubes, preventing the inner tube from rotating. The set screw has an interference thread, providing good anti-loosening effect. No clamping mechanism is needed to hold the outer and inner tubes, effectively improving the fatigue strength of the outer and inner tubes.

[0019] This invention has good stability. The inner and outer tubes are grease-lubricated at their contact surfaces. The grease is a mixture of silicon-based grease and graphite powder, which can effectively reduce friction and prevent the shock absorber from jamming. The silicon-based grease and graphite powder have excellent lubricity and anti-aging properties, ensuring long-lasting and reliable lubrication. Attached Figure Description

[0020] Figure 1 A schematic diagram of the structure of this utility model;

[0021] Figure 2 This utility model is installed on the vehicle frame location diagram. Detailed Implementation

[0022] like Figure 1 As shown, a lightweight shock-absorbing seatpost mechanism for bicycles includes: an inner tube 1-1, an outer tube 1-2, an internally threaded sleeve 1-3, a set screw 1-4, a bellows tube 1-5, and a base plate 1-6. The upper end of the inner tube 1-1 is connected to a seat mechanism, and the lower end of the inner tube 1-1 is centered and connected to the base plate 1-6. The outer edge of the base plate 1-6 is connected to the lower end of the bellows tube 1-5, and the upper end of the bellows tube 1-5 is connected to the internally threaded sleeve 1-3. The set screw 1-4 is located in a screw hole on the wall of the internally threaded sleeve 1-3. The internally threaded sleeve 1-3 is fitted onto the external thread at the lower end of the outer tube 1-2, and the inner hole of the outer tube 1-2 is fitted onto the outer side of the inner tube 1-1, forming a sliding pair.

[0023] The lower end of the outer tube 1-2 is provided with external threads.

[0024] The internal threaded sleeve 1-3 has a screw hole in the middle of its wall.

[0025] The inner tube 1-1 and the outer tube 1-2 are both made of carbon fiber reinforced polypropylene, and their bonding surfaces are grease-lubricated, with the grease being a mixture of silicon-based grease and graphite powder.

[0026] The corrugated pipes 1-3 are made of carbon fiber / glass fiber mixed filled nylon elastomer.

[0027] The set screws 1-4 are made of glass fiber filled nylon and have interference threads.

[0028] like Figure 2 As shown, the positions of the frame of this utility model are as follows: the upper left side of the outer tube 1-2 is fixedly connected to the upper end of the rear fork 2-1, the lower left side of the outer tube 1-2 is fixedly connected to the lower end of the rear fork 2-1, the upper right side of the outer tube 1-2 is fixedly connected to the upper tube 2-3, and the lower right side of the outer tube 1-2 is fixedly connected to the left side of the bottom bracket 2-5 and the lower left side of the lower tube 2-6 through the stiffening plate 2-4; the bottom plate 1-6 at the lower end of the outer tube 1-2 is located below the bottom bracket 2-5, wheel axle hole A, and wheel axle hole B.

Claims

1. A lightweight shock-absorbing seatpost mechanism for bicycles, comprising: The device comprises an inner tube, an outer tube, an internally threaded sleeve, a set screw, a bellows, and a base plate. The upper end of the inner tube is connected to a cushion mechanism, and the inner hole of the outer tube is fitted onto the outer side of the inner tube. The device is characterized in that: the lower end of the inner tube is connected to the base plate, the base plate is connected to the lower end of the bellows, the upper end of the bellows is connected to the internally threaded sleeve, the set screw is located in the screw hole of the internally threaded sleeve, and the internally threaded sleeve is fitted onto the external thread at the lower end of the outer tube.

2. The lightweight shock-absorbing seatpost mechanism for bicycles according to claim 1, characterized in that: The lower end of the outer tube is provided with external threads.

3. A lightweight shock-absorbing seatpost mechanism for bicycles according to claim 1 or 2, characterized in that: A screw hole is provided in the middle of the wall of the internally threaded sleeve.

4. The lightweight shock-absorbing seatpost mechanism for bicycles according to claim 3, characterized in that: The base plate is located below the bottom bracket, wheel axle hole A, and wheel axle hole B.

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