TWI749764B - Bicycle adjustable seat tube - Google Patents

Abstract

A bicycle adjustable seat tube includes a tube assembly, a connecting seat, a telescopic cylinder and a control assembly. The cylinder tube of the telescopic cylinder is connected to the outer tube of the seat tube assembly, and the piston rod of the telescopic cylinder is connected to the inner tube of the seat tube assembly and divides the cylinder into a first chamber and a second chamber. The connecting seat is used for connecting the bicycle seat cushion, and the connecting seat includes a motor chamber. The control assembly includes a motor provided with a cam and an actuating rod, wherein the motor is located in the motor chamber, the actuating rod is located in the seat tube assembly and one end extends into the motor chamber, and the cam abuts against the actuating rod. When the cam is driven by the motor to rotate, the actuating rod will reciprocate along its axial direction, thereby communicating or blocking the first chamber and the second chamber. When the first chamber is connected to the second chamber, the length of the seat tube assembly can be adjusted to adjust the height of the seat cushion.

Description

Bicycle adjustable seat tube

The invention relates to an adjustable bicycle seat tube; in particular, it refers to a wirelessly controlled bicycle adjustable seat tube structure.

Many high-end bicycles’ seat cushions are installed on the seat tube that can be adjusted in length at any time, so that the rider does not need to get off the bicycle to manually adjust the height of the seat cushion. Just by flipping the push switch on the handle, the seat tube can be lifted and lowered. Adjust the length. In addition to enhancing the rider's experience, this design is also more convenient and faster to use.

Please refer to Figure 1 for a conventional bicycle adjustable seat tube 1. The conventional bicycle adjustable seat tube 1 uses a lever 2 pivotally connected to the seat tube 3 as a fulcrum, and the middle section abuts against the valve stem 4 One end, the end of which abuts against the cam block 5, uses a lever structure to drive whether the oil circuit in the valve seat 6 is open or not.

When you want to adjust the height of the seat cushion, first press the start switch down to start the motor 7. When the motor 7 is started, the drive shaft 8 of the motor 7 will drive the cam block 5 to rotate a predetermined angle to make the cam block 5 move up. Push up the control rod 2, and then the control rod 2 will deflect and push the valve rod 4 upward, forcing the oil circuit in the valve seat 6 to be in an open state. At this time, the rider can face each other through the seatpost 9 according to their own needs. The linear displacement of the seat tube 3 further adjusts the height of the seat cushion.

After adjusting the seat cushion to an appropriate height, the rider only needs to release the start switch, so that the drive shaft 8 of the motor 7 drives the cam block 5 to release the thrust on the control rod 2, which is now set on the valve seat The restoring elastic member (not shown in the figure) inside 6 will push the valve stem 4 downward to force the oil passage in the valve seat 6 to be in a closed state, so as to complete the positioning of the seat stem 9.

Although the control rod, the valve rod and the cam block of the prior art form a labor-saving lever structure relationship, the moving stroke of the valve rod is too short, and the oil path in the valve seat is too small when the oil path is in the open state. When adjusting the length of the seat tube, it is easily obstructed by the fluid resistance in the valve seat and is not conducive to adjustment. In addition, if you want to maintain a proper oil passage space, you need to increase the size of the cam block to increase the movement stroke of the valve stem. However, this modified design method increases the volume and weight of the overall seat tube, which takes up more space. Therefore, it is necessary to solve the aforementioned problems.

In view of this, the object of the present invention is to provide a bicycle adjustable seat tube, which has the characteristics of light weight and convenient use.

In order to achieve the above object, the bicycle adjustable seat tube provided by the present invention includes a tube assembly, a connecting seat, a telescopic cylinder, and a control assembly. The seat tube assembly includes an outer tube and an inner tube with an outer diameter smaller than the inner diameter of the outer tube, and the inner tube is at least partially disposed in the outer tube and can move along the axial direction of the outer tube, wherein the outer tube The pipe system is used to be installed in the frame of a bicycle. The connecting seat is arranged at one end of the inner tube and is used for connecting the seat cushion of the bicycle, and has a motor chamber and a battery chamber, and the motor chamber communicates with the inner tube space of the inner tube. The telescopic cylinder has a cylinder tube and a piston rod, wherein the cylinder tube is connected to the outer tube and has a fluid inside; the piston rod has a rod body and a piston head connected to the rod body, and the rod body is connected to the One end of the inner tube extends into the cylinder barrel and is connected with the piston head; in addition, the piston head divides the cylinder barrel into a first chamber and a second chamber. The control assembly includes a motor, an actuating rod, a cam, a control circuit board, and a battery; the motor is arranged in the motor chamber and has an output shaft; the actuating rod is arranged in the seat tube assembly and one end thereof Into the motor chamber, its shaft The angle between the center and the axis of the output shaft is between 80 degrees and 100 degrees; the cam is arranged on the output shaft and has a driving part in the circumferential direction; the driving part abuts the actuating rod and drives the actuation The rod reciprocates along its axial direction between a first position and a second position; the driving part has a first part and a second part, and the shortest distance from the first part to the output shaft is smaller than the second part The shortest distance from the position to the output shaft; when the first part of the driving part abuts the actuating rod, the actuating rod is in the first position, so that the first chamber does not communicate with the second chamber; the driving part When the second part of the abutting the actuating rod, the actuating rod is in the second position, so that the first chamber is connected to the second chamber; the control circuit board is electrically connected to the motor for controlling the rotation of the output shaft ; The battery is arranged in the battery chamber and is electrically connected to the control circuit board.

The effect of the present invention is that the motor drives the cam to rotate to drive the actuating rod to move along its axial direction, thereby blocking or connecting the first chamber and the second chamber to achieve the purpose of adjusting or fixing the length of the seat tube assembly. Secondly, the design of the included angle between the axis of the output shaft of the motor and the axis of the actuating rod helps to save the output power of the motor. Furthermore, due to the operating relationship between the cam and the actuating rod in the present invention, when the second part abuts against the actuating rod, the fluid passage between the first chamber and the second chamber is appropriate, which facilitates fluid circulation in the chamber , It is more convenient to adjust the length of the seat tube assembly.

1: Bicycle adjustable seat tube

2: control lever

3: seat tube

4: Valve stem

5: Cam block

6: Valve seat

7: Motor

8: drive shaft

9: Seatpost

100: Bicycle adjustable seatpost

10: Seat tube assembly

12: Outer tube

14: inner tube

16: connecting seat

16a: receiving port

16b: accommodating mouth

16c: Through hole

161: Motor Chamber

162: Battery Chamber

163: first cover

164: second cover

165: Adjusting seat

166: fixed parts

20: Telescopic cylinder

22: Cylinder

24: Piston rod

242: Rod

244: Piston Head

30: Control components

31: Motor housing

31a: first opening

31b: second opening

32: Motor

321: output shaft

33: Actuating lever

34: Cam

342: Cam Body

343: drive part

343a: The first part

343b: The second part

344: Position Indicator

35: battery

36: control circuit board

361: side

362: wireless unit

362a: Antenna

362b: side

362c: Antenna

364: Light Interruption Sensor

364a: Sensing position

40: Press the switch

41: Signal transmitter

500: Bicycle adjustable seatpost

501: control circuit board

502: Antenna

503: first cover

503a: inner side

504: Motor Chamber

505: Wire

506: Charging Department

507: second cover

507a: inside

508: battery

600: wireless power supply device

R: scheduled steering

A1: The first chamber

A2: The second chamber

P1: first position

P2: second position

X1: axis

Figure 1 is a schematic diagram of the movement of a conventional bicycle lifting seat tube.

2 is a schematic diagram of the application of a bicycle adjustable seat tube according to a preferred embodiment of the present invention.

Fig. 3 is a schematic partial cross-sectional view of the bicycle adjustable seat tube of the above-mentioned preferred embodiment.

Fig. 4 is a partial exploded view of the control assembly in the bicycle adjustable seat tube of the above preferred embodiment.

Fig. 5 is a partially exploded view of Fig. 4 from another perspective.

Fig. 6 is a top view of the bicycle adjustable seat tube of the above preferred embodiment.

Fig. 7 is a partial cross-sectional view taken in the direction of 7-7 in Fig. 6;

Fig. 8 is a cross-sectional view taken along the 8-8 direction of Fig. 6;

Fig. 9 is a partial cross-sectional view similar to Fig. 7, revealing that the second part of the driving part of the cam abuts against the actuating rod.

Figure 10 is a cross-sectional view similar to Figure 8, revealing that the inner tube moves downward relative to the outer tube to shorten the length of the overall seat tube assembly.

Fig. 11 is a partial exploded view of a bicycle adjustable seat tube according to another preferred embodiment of the present invention.

Fig. 12 is a schematic partial cross-sectional view of the bicycle adjustable seat tube of the above-mentioned preferred embodiment.

In order to explain the present invention more clearly, a detailed description is given below with reference to preferred embodiments in conjunction with the drawings. Please refer to FIGS. 2 and 3, which is a bicycle adjustable seat tube 100 according to a preferred embodiment of the present invention, which includes a tube assembly 10, a telescopic cylinder 20 and a control assembly 30.

The seat tube assembly 10 includes an outer tube 12 and an inner tube 14 having an outer diameter smaller than the inner diameter of the outer tube 12, and the inner tube 14 penetrates the outer tube 12 in a manner movable along the axial direction of the outer tube 12. Tube 12 on. The outer tube 12 is used to connect to the frame of a bicycle (not shown), the upper end of the inner tube 14 is located outside the outer tube 12 and is provided with a connecting seat 16, and the connecting seat 16 is used to connect The seat cushion of the bicycle (not shown).

The connecting seat 16 has a motor chamber 161 and a battery chamber 162. The motor chamber 161 communicates with the inner space of the inner tube 14 and the battery chamber 162. The motor chamber 161 is located between the bicycle Between the seat cushion and the inner tube 14 and partially overlap with the projection area of the inner tube 14 extending toward the seat cushion of the bicycle. Among them, the motor chamber 161 is A receiving port 16a and an accommodating port 16b located on different sides are connected to the outside. The receiving port 16a and the accommodating port 16b are respectively located on two opposite positions of the connecting seat 16, and the accommodating port 16b Located at the connection between the motor chamber 161 and the battery chamber 162. The connecting seat 16 further includes a first cover 163 and a second cover 164, the first cover 163 is used to close the receiving port 16a, and the second cover 164 is used to close the receiving port 16b. The aforementioned connecting seat 16 and the inner tube 14 are integrally formed, and the outer tube 12 is made of metal materials to maintain the rigidity of the seat tube assembly, and the first cover 163 and the second cover 163 The cover 164 is made of non-metallic materials, such as common non-metallic materials such as plastic, silicon rubber, or glass fiber composite materials.

It is supplemented that, in this embodiment, the structure for realizing the combination of the seat tube assembly 10 and the seat cushion of the bicycle includes two through holes 16c provided in the connecting seat 16 and an adjusting seat 165 and two fixing members 166 are provided. The two through holes 16c communicate with the motor chamber 161, and one of them corresponds to the receiving port 16a and the other corresponds to the receiving port 16b. Each of the fixing members 166 sequentially passes through a through hole 16c and the adjusting seat 165, and fixed on the seat cushion of the bicycle. With the aforementioned structural design, the seat cushion of the bicycle can adjust the angle according to individual needs, and improve the flexibility of use. In addition, the number of the aforementioned through holes and fixing members is not limited to this.

The telescopic cylinder 20 has a cylinder tube 22 and a piston rod 24. The cylinder 22 is fixed in the outer tube 12 and is filled with a fluid (not shown). The fluid can be a gas or a liquid. The piston rod 24 has a rod body 242 and a piston head 244 connected to the rod body 242, wherein the rod body 242 is fixed to the inner tube 14, and one end of the rod body 242 extends into the cylinder tube 22 and is connected to the piston head 244 Also, the piston head 244 divides the cylinder 22 into a first chamber A1 and a second chamber A2. Whether the first chamber A1 and the second chamber A2 are connected or not will affect the piston rod 24 Whether the inner tube 14 can move relative to the cylinder 22 will affect whether the inner tube 14 can move relative to the outer tube 12.

The control assembly 30 is used to control the communication or blocking of the first chamber A1 and the second chamber A2. Referring to FIGS. 4 to 8, the control assembly 30 includes a motor housing 31 and a horse. Up to 32, an actuating rod 33, a cam 34, a battery 35 and a control circuit board 36. The motor housing 31 is disposed in the motor chamber 161 from the accommodating opening 16b, and has a first opening 31a and a second opening 31b opposite to each other. The motor 32 is inserted into the first opening 31a. The inside of the motor housing 31, and the output shaft 321 of the motor 32 penetrates the second opening 31b.

The actuating rod 33 of the control assembly 30 is located in the piston rod 24 and its upper end extends into the motor chamber 161. The cam 34 is disposed on the output shaft 321 and has a cam body 342 and a position indicating portion 344 fixedly connected to each other, wherein the cam body 342 has a driving portion 343 in the circumferential direction. The driving part 343 abuts against the actuating rod 33 and drives the actuating rod 33 to reciprocate along its axial direction. The driving part 343 has a first part 343a and a second part 343b. As shown in FIGS. 7 and 9, the shortest distance from the first part 343a to the axis of the output shaft 321 is shorter than the second part 343b to the output The shortest distance of the axis of the shaft 321. When the first part 343a of the driving part 343 abuts the actuating rod 33, the actuating rod 33 is at a first position P1; when the second part 343b of the driving part 343 abuts the actuating rod 33, the actuating rod 33 33 in a second position P2.

The battery 35 is disposed in the battery chamber 162 from the accommodating opening 16b, and is electrically connected to the control circuit board 36 (not shown) for supplying voltage.

The control circuit board 36 is disposed on the outer surface of the motor housing 31 and is electrically connected to the motor 32. The control circuit board 36 is used to control the rotation of the output shaft 321 of the motor 32 and includes a wireless unit 362 and a light-interrupting sensor 364. The wireless unit 362 is used for signal connection with a signal transmitter 41 of a push switch 40 arranged on the handlebar of the bicycle, and the signal transmitter 41 controls the action of the motor 32 by means of wireless transmission. The wireless unit has an antenna 362a, and the wireless unit 362 has a side surface 362b of the antenna 362a facing the receiving port 16a, and an included angle between an axis X1 perpendicular to the side surface 362b and the opening direction of the receiving port 16a is between Between 0 degrees and 15 degrees, the axial direction of the antenna 362a and the receiving port 16a in this embodiment The angle between the opening direction of the antenna 362a is 0 degrees, so that the antenna 362a has a better reception effect. In addition, the wireless unit can also be integrated with the control circuit board 36 to arrange the antenna 362c on a side 361 of the control circuit board 36 away from the motor 32, as shown in FIG. 4, although the reception effect of this embodiment is not as good An embodiment is good, but it can achieve the advantages of reducing overall weight and occupying space.

The light interruption sensor 364 of the control circuit board 36 is arranged on the side of the control circuit board 36 combined with the motor housing 31 and has a sensing position 364a (refer to FIG. 7). The position of the cam 34 indicates The portion 344 can be driven by the output shaft 321 to selectively approach or move away from the sensing position 364a, thereby detecting the rotation state of the cam 34, and inferring which part of the driving part 343 abuts the actuating rod 33 .

As shown in FIGS. 7 to 10, when the rider presses the push switch 40 on the handlebar of the bicycle, the signal transmitter 41 of the push switch 40 sends a signal to the wireless unit 362, and the control circuit board 36 reads the signal And control the output shaft 321 of the motor 32 to rotate toward a predetermined steering R, and the position indicating portion 344 of the cam 34 will enter the sensing position 364a toward the predetermined steering R. At the same time, the driving part 343 of the cam 34 pushes the actuating rod 33 to move from the first position P1 toward the second position P2 until the position indicating portion 344 leaves the sensing position 364a toward the predetermined turning R, The cam 34 stops rotating. When the position indicating portion 344 leaves the sensing position 364a toward the predetermined steering R, the second portion 343b of the driving portion 343 abuts the actuating rod 33, and the actuating rod 33 is located at the second position P2, so that the first The chamber A1 communicates with the second chamber A2. At this time, the piston rod 24 can move up and down in the cylinder 22 to change the volume of the first chamber A1 and the second chamber A2, thereby making the inner tube 14 relative to the outer The tube 12 moves along its axial direction to achieve the purpose of adjusting the height of the seat cushion.

When the bicycle seat cushion is adjusted to a proper height, the rider releases the push switch 40, and the cam 34 enters the sensing position 364a in the opposite direction of the predetermined steering R. At the same time, the driving part 343 of the cam 34 pushes the actuating rod 33 from the second position P2 toward the second position P2 A position P1 moves until the position indicating portion 344 leaves the sensing position 364a in the opposite direction of the predetermined turning R, and the cam 34 stops rotating. When the position indicating portion 344 leaves the sensing position 364a in the opposite direction of the predetermined turning R, the first part 343a of the driving part 343 abuts the actuating rod 33, and the actuating rod 33 is located at the first position P1, so that The first cavity A1 is not connected to the second cavity A2, so as to fix the height of the seat cushion. In other practical applications, the application mechanism of the photo-interruption sensor can be designed and changed according to requirements, and it is not limited to using the photo-interruption sensor as a component for sensing the cam movement track, and can be an electromagnetic sensor.

It is further explained that the included angle between the axis of the actuating rod 33 and the axis of the output shaft 321 is between 80 degrees and 100 degrees; preferably, the axis of the actuating rod 33 and the axis of the output shaft 321 The included angle of the shaft is between 84 degrees and 96 degrees; in this embodiment, the included angle between the shaft center of the actuating rod 33 and the shaft center of the output shaft 321 is 90 degrees, so that the motor 32 can be maintained at Better efficiency. In addition, considering the space design of the motor chamber 161, the shortest distance between the axis of the actuating rod 33 and the axis of the output shaft 321 is between 0 mm and 15 mm, which can be adapted to different design changes. It does not affect the working efficiency of the motor 32 and the amount of movement of the actuating rod 33, and does not occupy too much volume.

Please refer to Figures 11 and 12, the present invention also provides a preferred embodiment of the bicycle adjustable seat tube 500, the wireless unit (not shown) of the bicycle adjustable seat tube 500 is also integrated in the control circuit board 501 , And an antenna 502 electrically connected to the wireless unit is disposed on the inner side 503a of the first cover 503 and located in the motor chamber 504, and the antenna 502 is electrically connected to the control circuit board 501 by a wire 505 In this way, the antenna 502 has a better reception effect. In addition, the bicycle adjustable seat tube 500 includes a charging portion 506 disposed on the inner surface 507 a of the second cover 507. The charging unit 506 is provided with a receiving coil (not shown in the figure), and the charging unit 506 can induce an external magnetic field through the receiving coil, and convert the induced magnetic field into an induced voltage to be transmitted to the battery 508.

12 discloses a wireless power supply device 600 attached to the outer side of the second cover 507, and the wireless power supply device 600 includes a transmission induction coil (not shown), the transmission induction coil of the wireless power supply device 600 will generate a specific In order to make the receiving coil of the charging unit 506 magnetize under the influence of the magnetic field, the magnetic energy is converted into electric energy and transmitted to the battery 508 to achieve the purpose of charging. The wireless power supply device 600 has a magnet or a magnetic element made of a magnetically attractable material, and the charging portion 506 is provided with a magnet or a magnetic element made of a magnetically attractable material. The magnetically attractable material includes but is not limited to nickel and cobalt. The magnet or magnetic element of the wireless power supply device 600 is magnetically attracted to the magnet or magnetic element of the charging portion 506, so that the wireless power supply device 600 can be firmly attached to the charging portion 506. However, in other practical applications, the charging part can be electrically connected to a power supply device in the form of male and female butt joints. For example, the plug of the power supply device is inserted into the socket of the charging part and electrically connected with metal contacts.

To sum up, the bicycle adjustable seat tube of the present invention drives the cam to rotate through the motor to drive the actuating rod to move along its axial direction, thereby blocking or connecting the first chamber and the second chamber in the cylinder to achieve adjustment or The purpose of fixing the length of the seat tube assembly. In addition, the design of the included angle between the axis of the output shaft of the motor and the axis of the actuating rod in the present invention and the design of the distance between the axis of the actuating rod and the axis of the output shaft help to save the output power of the motor , And avoid excessive volume at the connecting seat. Furthermore, due to the structural design between the cam and the actuating rod in the present invention, when the second part of the driving part abuts the actuating rod, the fluid passage between the first chamber and the second chamber is appropriate, which is advantageous The fluid between the first chamber and the second chamber circulates mutually, so that the length of the seat tube assembly is adjusted more smoothly.

The above are only the preferred and feasible embodiments of the present invention. Any equivalent changes made by applying the specification of the present invention and the scope of the patent application should be included in the patent scope of the present invention.

100: Bicycle adjustable seatpost

10: Seat tube assembly

12: Outer tube

14: inner tube

16: connecting seat

165: Adjusting seat

166: fixed parts

20: Telescopic cylinder

22: Cylinder

24: Piston rod

40: Press the switch

41: Signal transmitter

A1: The first chamber

A2: The second chamber

Claims (12)

An adjustable seat tube for bicycles, comprising: a tube assembly including an outer tube and an inner tube with an outer diameter smaller than the inner diameter of the outer tube, and the inner tube is at least partially disposed in the outer tube and can run along the outer tube The outer tube is used for setting in the frame of a bicycle; a connecting seat is provided on one end of the inner tube and is used for connecting the seat cushion of the bicycle, and has an accommodating opening, A receiving port, a first cover, a motor chamber and a battery chamber, the receiving port and the receiving port are respectively connected with the motor chamber, and the receiving port and the receiving port are respectively located in the On different sides of the connecting seat, the first cover is made of non-metallic material and closes the receiving port, and the motor chamber is connected to the inner tube space of the inner tube; a telescopic cylinder with a cylinder barrel and a piston rod, wherein The cylinder is connected to the outer tube and has a fluid inside; the piston rod has a rod body and a piston head connected to the rod body, and the rod body is connected to the inner tube, one end of which extends into the cylinder and is connected to the Piston head; In addition, the piston head divides the cylinder into a first chamber and a second chamber; and a control assembly, including a motor, an actuating rod, a cam, a control circuit board and a battery; The motor is arranged in the motor chamber and has an output shaft; the actuating rod is arranged in the seat tube assembly and one end extends into the motor chamber, and the included angle between the shaft center and the shaft center of the output shaft is between Between 80 degrees and 100 degrees; the cam is provided on the output shaft, and has a driving part in the circumferential direction; the driving part abuts the actuating rod, and drives the actuating rod to reciprocate along its axial direction to a first position And a second position; the driving part has a first part and a second part, and the shortest distance from the first part to the output shaft is less than the shortest distance from the second part to the output shaft; when the driving When the first part of the driving part abuts the actuating rod, the actuating rod is in the first position so that the first chamber is not connected to the second chamber; when the second part of the driving part abuts the actuating rod, the The actuating rod is in the second position, so that the first chamber is connected to the second chamber; The control circuit board is electrically connected to the motor for controlling the rotation of the output shaft, the control circuit board includes a wireless unit, the wireless unit has an antenna, and the wireless unit has a side of the antenna facing the receiving port; the The battery is arranged in the battery chamber and is electrically connected to the control circuit board. The bicycle adjustable seat tube according to claim 1, wherein the connecting seat is integrally formed. The bicycle adjustable seat tube according to claim 1, wherein the included angle between the axis of the actuating rod and the axis of the output shaft is between 84 degrees and 96 degrees. The bicycle adjustable seat tube according to claim 1, wherein the shortest distance between the axis of the actuating rod and the axis of the output shaft is between 0 mm and 15 mm. The bicycle adjustable seat tube according to claim 1, wherein the angle between an axis perpendicular to the side surface and the opening direction of the receiving port is between 0 degrees and 15 degrees; the first cover body closes the receiving port . The bicycle adjustable seat tube according to claim 5, wherein the motor chamber communicates with the battery chamber, and the accommodating port is provided at the connection between the motor chamber and the battery chamber, and the motor chamber is located at the Between the seat cushion of the bicycle and the inner tube, and partially overlaps in the projection area of the inner tube extending toward the seat cushion; the connecting seat includes a second cover, and the second cover closes the accommodating opening . The bicycle adjustable seat tube according to claim 6, wherein the connecting seat is made of a metal material, and the second cover is made of a non-metal material. The bicycle adjustable seat tube according to claim 1, wherein the control circuit board has a sensor, and the sensor has a sensing position; a part of the cam can be driven by the output shaft to selectively Approaching or away from the sensing position, and thereby detecting the rotation state of the cam. The bicycle adjustable seat tube according to claim 6, wherein the connecting seat has at least one through hole, wherein the at least one through hole communicates with the motor chamber and corresponds to one of the receiving port and the receiving port; the connection The seat includes an adjusting seat and at least one fixing member, wherein the at least one fixing member is arranged in the at least one through hole, the adjusting seat and the seat cushion of the bicycle. The bicycle adjustable seat tube according to claim 1, wherein the antenna is arranged on a side of the control circuit board away from the motor. The bicycle adjustable seat tube according to claim 1, wherein the receiving port and the accommodating port are respectively located on two opposite positions of the connecting seat. The bicycle adjustable seat tube according to claim 6, wherein the second cover is provided with a charging part, and the charging part is used to charge the battery.

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