CN203806096U - Automatic speed changing bicycle - Google Patents

Abstract

An automatic variable speed bicycle belongs to the field of daily necessities. The purpose of the utility model is to add a set of speed change device between the central shaft of the bicycle and the flywheel, so as to achieve an automatic speed-changing bicycle which can make the bicycle run at variable speed. The central shaft gear plate of the bicycle of the utility model is connected with the driving input sprocket on the gearbox through the driving chain, and the driven sprocket on the output shaft assembly of the gearbox is connected with the flywheel of the rear axle through the driven chain. The utility model is reasonable in structure, easy to use, cancels the speed regulation mode of the tower wheel, and adjusts the transmission mode by adding a clutch between the central shaft controlled by the pedals and the flywheel of the rear wheel, thereby achieving the speed change effect.

Description

automatic transmission bicycle

technical field

The utility model belongs to the field of daily necessities.

Background technique

Variable-speed manpower self-propelled vehicles are more popular at present, and the conventional basic is that the chain can be placed on different gears by the variable-speed gear, thereby changing the speed of the vehicle to adapt to different road conditions and the physical strength of the cyclist.

Contents of the invention

The purpose of the utility model is to add a set of speed change device between the central shaft of the bicycle and the flywheel, so as to achieve an automatic speed-changing bicycle that can drive the bicycle at variable speed.

The central shaft gear plate of the bicycle of the utility model is connected with the active input sprocket on the gearbox through the driving chain, and the driven sprocket on the output shaft assembly of the gearbox is connected with the flywheel of the rear axle through the driven chain;

The structure of the gearbox is: it is composed of the active transmission wheel set and the driven transmission wheel set in the housing.

Active gear wheel set:

a. One end of the driving shaft is connected to the housing through a bearing, and the other end is the upper half of the dog clutch, and the outer casing of the lower half of the dog clutch that matches the teeth of the upper part of the jaw clutch is connected to the housing through a bearing , the driving sprocket is fixed on the jacket of the lower half of the jaw clutch, and the driving conical fixed wheel is fixed on the driving shaft;

b. The shaft sleeve is set on the driving shaft. The lower part of the shaft sleeve has the driving shaft spline matching the driving shaft. There is a chute on the driving shaft. fixed on the shaft sleeve;

c. The other end of the driving shaft is installed with a driving side thrust ball bearing, one end of the driving side diaphragm spring is on the driving side thrust ball bearing, and the other end of the driving side diaphragm spring is on the adjusting pressure piece, and the adjusting pressure piece is threaded on the speed control on the knob;

Driven transmission wheel set:

a. A driven side thrust ball bearing is installed at one end of the driven shaft, a driven side diaphragm spring is installed between the driven side thrust ball bearing and the housing, and a driven conical driving wheel is fixedly installed on the driven shaft;

b. The other end of the driven shaft is covered with a driven side bushing, and there is a driven side chute between the driven shaft and the driven side bushing, which corresponds to the driven side on the driven shaft of the driven side chute. The shaft spline matches the driven side bushing spline of the driven side bushing corresponding to the driven side chute, and the driven tapered fixed wheel is installed on the driven side bushing;

c. The shaft sleeve on the driven side protrudes from the casing, and the driven sprocket is fixedly installed on it.

The utility model has a reasonable structure and is convenient to use, cancels the speed regulation mode of the tower wheel, and adjusts the transmission mode by adding a clutch between the central shaft controlled by the pedals and the flywheel of the rear wheel, so as to achieve the speed change effect.

Description of drawings

Fig. 1 is a structural representation of the utility model;

Fig. 2 is a structural schematic diagram of the utility model gearbox;

Fig. 3 is a connection mode diagram of the drive shaft and the axle sleeve in the gearbox of the present invention;

Fig. 4 is a diagram of the connection mode between the driven shaft and the driven bushing in the gearbox of the present invention.

Detailed ways

Bicycle 1 center shaft gear plate 2 of the present utility model is connected with the active input sprocket 4 on the gearbox 5 through the driving chain 3, and the driven sprocket 12 on the output shaft assembly 6 of the gearbox 5 is connected with the rear axle flywheel through the driven chain 7 8 connections;

The structure of the gearbox 5 is: it is made up of the active transmission wheel group and the driven transmission wheel group in the housing 14,

Active gear wheel set:

a. One end of the driving shaft 15 is connected to the housing 14 through a bearing, and the other end is the upper part 22 of the dog clutch, and the lower part 22 of the dog clutch that cooperates with the teeth of the upper part 23 of the dog clutch passes through The bearing is connected with the housing 14, the driving sprocket 4 is fixed on the overcoat of the lower part 23 of the jaw clutch, and the driving conical fixed wheel 20 is fixed on the driving shaft 15;

b. The shaft sleeve 26 is set on the driving shaft 15. The lower part of the shaft sleeve 26 has the driving shaft spline 32 matched with the driving shaft 15. There is a chute 27 on the driving shaft 15. The upper part of the shaft sleeve 26 has a protrusion. In the chute 27, the active conical wheel 21 is fixed on the shaft sleeve 26;

c. The other end of the drive shaft 15 is equipped with a drive side thrust ball bearing 19, one end of the drive side diaphragm spring 18 is placed on the drive side thrust ball bearing 19, and the other end of the drive side diaphragm spring 18 is placed on the adjustment pressure piece 16, adjust The pressing piece 16 is threaded on the speed regulating knob 17;

Driven transmission wheel set:

a. A driven side thrust ball bearing 9 is installed on one end of the driven shaft 11, a driven side diaphragm spring 24 is installed between the driven side thrust ball bearing 9 and the housing 14, and a driven side diaphragm spring 24 is fixedly installed on the driven shaft 11. Moving cone moving wheel 10;

b. The other end of the driven shaft 11 is covered with a driven side sleeve 28, and there is a driven side chute 29 between the driven shaft 11 and the driven side sleeve 28, corresponding to the driven shaft 11 of the driven side chute 29 The driven side driven shaft spline 30 on the top matches the driven side bushing spline 31 of the driven side bushing 28 corresponding to the driven side chute 29, and the driven cone is installed on the driven side bushing 28 Shaping wheel 13;

c. The driven side bushing 28 protrudes from the casing 14, and the driven sprocket 12 is fixedly mounted on it.

The driving shaft between the driving cone fixed wheel and the driving cone driving wheel is connected with the driven shaft between the driven cone fixing wheel and the driven cone driving wheel through a belt.

The working process inside the gearbox is:

The state shown in Fig. 2 is the state with the largest transmission ratio, that is, the normal working state.

When the resistance of the driven sprocket is too large, the torque on the driving sprocket is too large. Since 23 and 22 are the contact surfaces between the two halves of the jaw clutch, 22 will be pushed by 23, and 23 will drive the driving shaft. Moving upward, at this time, the distance between the active conical fixed wheel and the active conical driving wheel becomes larger, and the turning radius of the V-shaped belt between them decreases. At the same time, the driven conical fixed wheel and the driven conical driving wheel Under the action of the tension of the moving side diaphragm spring, the gap is narrowed and the V-belt is tensioned, so that the transmission ratio changes, the active radius of the belt driving wheel decreases, the active radius of the driven wheel increases, and the transmission ratio becomes smaller, which reduces the bearing capacity of the driving sprocket. torque.

When the resistance of the driven sprocket changes from large to small, the jaw clutch is pushed by the diaphragm spring on the driving side to move the driving shaft downward. Since the spring force of the diaphragm spring on the driving side is greater than that of the diaphragm spring on the driven side, the gap is reduced. The active rotation radius of the V-belt is enlarged, the driven rotation radius is reduced, the transmission ratio is increased, the torque borne by the driving sprocket is increased, and the system returns to normal working condition.

Through the above state changes, the torque borne by the driving sprocket is stabilized within a certain range, and the elastic force of the diaphragm spring on the driving side can be changed by adjusting the knob. Change the maximum torque that the driving sprocket can bear.

Claims (1)

1. An automatic variable speed bicycle, characterized in that: the bicycle (1) center shaft chainring (2) is connected with the active input sprocket (4) on the gearbox (5) through the active chain (3), and the gearbox (5) ) The upper driven sprocket (12) of the output shaft assembly (6) is connected with the rear axle flywheel (8) through the driven chain (7); The structure of the gearbox (5) is: it is made up of the active transmission wheel group and the driven transmission wheel group in the housing (14), Active gear wheel set: a. One end of the drive shaft (15) is connected to the housing (14) through a bearing, and the other end is the upper half of the jaw clutch (22), which is matched with the teeth of the upper half of the jaw clutch (23). The outer casing of the lower part of the clutch (22) is connected with the housing (14) through bearings, the driving sprocket (4) is fixed on the outer casing of the lower half of the jaw clutch (23), and the driving conical fixed wheel (20) is fixed on the driving shaft (15); b. The shaft sleeve (26) is sleeved on the driving shaft (15). The lower part of the shaft sleeve (26) has the driving shaft spline (32) matching the driving shaft (15). Groove (27), the upper part of the boss of the bushing (26) is placed in the chute (27), and the active conical wheel (21) is fixed on the bushing (26); c. The other end of the driving shaft (15) is installed with the driving side thrust ball bearing (19), and one end of the driving side diaphragm spring (18) is supported on the driving side thrust ball bearing (19), and the driving side diaphragm spring (18) is on the other side One end rests on the adjusting pressing piece (16), and the adjusting pressing piece (16) is threaded on the speed regulating knob (17); Driven transmission wheel set: a. A driven side thrust ball bearing (9) is installed at one end of the driven shaft (11), and a driven side diaphragm spring (24) is installed between the driven side thrust ball bearing (9) and the housing (14), A driven conical driving wheel (10) is fixedly installed on the driven shaft (11); b. The other end of the driven shaft (11) is covered with a driven-side bushing (28), and there is a driven-side chute (29) between the driven shaft (11) and the driven-side bushing (28). The driven side driven shaft spline (30) on the driven shaft (11) of the driven side chute (29) corresponds to the driven side of the driven side sleeve (28) of the driven side chute (29) The sleeve spline (31) is matched, and the driven conical fixed wheel (13) is installed on the driven side sleeve (28); c. The driven side bushing (28) protrudes from the casing (14), and the driven sprocket (12) is fixedly installed on it.