CN109080761B

CN109080761B - Speed change gear of environmental sanitation tricycle

Info

Publication number: CN109080761B
Application number: CN201810933591.6A
Authority: CN
Inventors: 不公告发明人
Original assignee: Permanently Happy Head Of District In Fuzhou City Wins Information Technology Co ltd
Current assignee: The permanently happy head of district in Fuzhou City wins Information Technology Co.,Ltd.
Priority date: 2018-08-16
Filing date: 2018-08-16
Publication date: 2020-04-14
Anticipated expiration: 2038-08-16
Also published as: CN109080761A

Abstract

The invention belongs to the field of speed change devices, and particularly relates to a speed change device of a sanitation tricycle, which comprises a crank, a connecting rod, a swing rod, a second shaft sleeve, a sector plate, a second shaft hole, a first speed change pin, a second speed change pin, a third speed change pin, a pulley, a fixed block, a steel wire rope, a driven wheel and the like, wherein a passing notch is formed in the end face of one end of the swing rod; a through seventh pin hole is formed between two opposite side surfaces at one end of the swing rod, and an eighth pin hole, a ninth pin hole and a tenth pin hole are sequentially formed at the other end of the swing rod; the speed change device does not need excessive precision processing; the relative cost is low, and the reliability is high; the speed change device can realize the speed which is three times of the first gear at most, and the whole device occupies smaller space, thereby providing proper space for subsequent upgrading and reconstruction; in addition, the whole device is driven by a steel wire rope, so that the steel wire rope has relatively low cost, easy maintenance and convenient replacement; the invention has simple structure and better use effect.

Description

Speed change gear of environmental sanitation tricycle

Technical Field

The invention belongs to the field of speed changing devices, and particularly relates to a speed changing device of a sanitation tricycle.

Background

At present, the traditional sanitation tricycle is not provided with a speed change mechanism and is only driven by a certain speed ratio, and users of the sanitation tricycle can be different crowds, old and weak crowds or strong in age; if the tricycle has different speed ratios, different people can meet physical requirements of users when the tricycle is used by different people, and in order to save cost, the speed ratio of the tricycle can be determined after the users determine the speed ratio, and the transmission ratio change is not needed in the riding process. For a bicycle speed change mechanism, the speed of a two-wheel bicycle speed change device is changed by changing the matching of a chain and gear discs with different front and rear sizes; the size of the front fluted disc and the size of the rear fluted disc determine the force of the bicycle when the pedals are rotated; the bigger the front fluted disc is, the smaller the rear fluted disc is, and the harder the pedal feels; the smaller the front fluted disc is, and the larger the rear fluted disc is, the easier the pedals feel; in order to achieve the purpose of adjusting the optimal speed, a plurality of front gear discs and rear gears are combined in pairs, so that excessive space is occupied; the traditional speed change device has a complex structure and mainly depends on chain transmission; the chain structure is relatively complex, the production cost is high, and the difficulty of maintenance and replacement is relatively high; after a period of use, the speed change conversion device is likely to fail, and thus the ideal speed change effect is not achieved. The use of a transmission mechanism for a two-wheeled vehicle in a sanitation tricycle is obviously unsuitable. Therefore, the speed changing device suitable for the sanitation tricycle is needed to be designed.

The invention designs a speed changing device of a sanitation tricycle to solve the problems.

Disclosure of Invention

In order to solve the defects in the prior art, the invention discloses a speed change device of a sanitation tricycle, which is realized by adopting the following technical scheme.

The utility model provides a sanitation tricycle speed change gear which characterized in that: the transmission mechanism comprises a rear wheel shaft, a pedal shaft, a U-shaped crossbeam, a connecting rod, a supporting shaft, a second shaft sleeve, a sector plate, a second shaft hole, a first speed changing pin, a second speed changing pin, a third speed changing pin, a pulley, a fixed block, a steel wire rope, a driven wheel, a first shaft hole, a movable circular groove, a one-way clutch, a volute spring, a first shaft sleeve, a supporting block, a crank, a second pin hole, a connecting rod, a third pin hole, a fourth pin hole, a swing rod, a passing notch, a seventh pin hole, an eighth pin hole, a first pin hole, a fifth pin hole, a sixth pin hole, a ninth pin hole and a tenth pin hole, wherein the passing notch is formed in the end face of one; a through seventh pin hole is formed between two opposite side surfaces at one end of the swing rod, and an eighth pin hole, a ninth pin hole and a tenth pin hole are sequentially formed at the other end of the swing rod; the eighth pin hole is communicated with the passing notch; the ninth pin hole is communicated with the passing notch; the tenth pin hole is communicated with the passing notch; one end of the swing rod, which is provided with a seventh pin hole, is arranged in a U-shaped notch of a U-shaped cross beam of the tricycle through a support shaft; the second shaft sleeve is arranged on the supporting shaft through the matching of the inner circular surface of the second shaft sleeve and a bearing on the outer circular surface of the supporting shaft; one end of the second shaft sleeve is fixedly connected with the side surface of the swing rod; the radian of the sector plate is 90 degrees; a second shaft hole is formed in the end face of the sector plate, close to the arc center; the fan-shaped plate is nested on the outer circular surface of the second shaft sleeve through the second shaft hole and is fixedly connected with the second shaft sleeve; the first speed changing pin, the second speed changing pin and the third speed changing pin are arranged on the end surface of the sector plate; the distance between the center of the first speed change pin and the center of the second shaft hole is smaller than the distance between the center of the second speed change pin and the center of the second shaft hole; the distance between the center of the second shift pin and the center of the second shaft hole is smaller than the distance between the center of the third shift pin and the center of the second shaft hole; a certain included angle exists between a connecting line of the center of the first speed changing pin and the center of the second shaft hole and a connecting line of the center of the second speed changing pin and the center of the second shaft hole; a certain included angle exists between a connecting line of the center of the second speed changing pin and the center of the second shaft hole and a connecting line of the center of the third speed changing pin and the center of the second shaft hole; and a certain included angle exists between a connecting line of the center of the first speed changing pin and the center of the second shaft hole and a connecting line of the center of the third speed changing pin and the center of the second shaft hole.

The supporting block is arranged on the upper end surface of a U-shaped cross beam of the tricycle through one end of the supporting block; the five pulleys are respectively and sequentially arranged on one side, close to the sector plate, of the supporting block from top to bottom through pins, and the distances among the five pulleys are equal; a first pulley and a second pulley are matched with a first speed changing pin from bottom to top, a second pulley and a third pulley are matched with a second speed changing pin, and a third pulley and a fourth pulley are matched with a third speed changing pin; the fixed block is installed on one side that is close to the sector plate on the supporting shoe, and the fixed block is located the below of the pulley of bottommost.

A first pin hole and a second pin hole are respectively formed in the two ends of the crank; the two cranks are symmetrically arranged on the pedal shaft through the matching of the respective first pin holes and the outer circular surface of the pedal shaft; one end of the connecting rod is provided with a third pin hole, and the other end of the connecting rod is sequentially provided with a fourth pin hole, a fifth pin hole and a sixth pin hole; one end of the connecting rod, which is provided with a third pin hole, is connected with one end of the crank, which is provided with a second pin hole, through a pin, and the end of the connecting rod, which is provided with the third pin hole, is positioned between the two cranks; one end of the connecting rod, which is provided with a fourth pin hole, is connected with one end of the oscillating bar, which is provided with an eighth pin hole, through a pin; the fourth pin hole is matched with the eighth pin hole; the fifth pin hole is matched with the ninth pin hole; the sixth pin hole is matched with the tenth pin hole; one end of the connecting rod, which is provided with a fourth pin hole, is matched with the passing notch.

The one-way clutch is arranged on the rear wheel shaft through the fixed connection between the inner circular surface of the one-way clutch and the outer circular surface of the rear wheel shaft; a movable circular groove is formed in the center of one end face of the driven wheel; a first shaft hole is formed in the center of the other end face of the driven wheel and communicated with the movable circular groove; the driven wheel is nested on the outer circular surface of the one-way clutch through the first shaft hole; the first shaft sleeve is arranged on the rear wheel shaft through the matching of the inner circular surface of the first shaft sleeve and a bearing on the outer circular surface of the rear wheel shaft, and one end of the first shaft sleeve is positioned in the movable circular groove of the driven wheel; one end of the first shaft sleeve extending out of the movable circular groove is fixedly connected with a U-shaped cross beam of the tricycle through a connecting rod; the volute spiral spring is wound on the outer circular surface of the first shaft sleeve and is positioned in the movable circular groove of the driven wheel; two ends of the volute spiral spring are respectively connected with the inner circular surface of the movable circular groove and the outer circular surface of the first shaft sleeve; one end of the steel wire rope is fixedly connected with the upper end face of the fixed block, and the other end of the steel wire rope rounds the uppermost pulley and is wound on the outer circular face of the driven wheel; the steel wire rope is matched with the five pulleys.

As a further improvement of the present technique, the first shift pin is in contact with the wire in an initial state.

As a further improvement of the present technology, an angle between a line connecting the center of the first shift pin and the center of the second shaft hole and a line connecting the center of the second shift pin and the center of the second shaft hole is 30 degrees.

As a further improvement of the present technology, an angle between a line connecting the center of the second shift pin and the center of the second shaft hole and a line connecting the center of the third shift pin and the center of the second shaft hole is 30 degrees.

As a further improvement of the present technology, an angle between a line connecting the center of the first shift pin and the center of the second shaft hole and a line connecting the center of the third shift pin and the center of the second shaft hole is 60 degrees.

As a further improvement of the present technology, in an initial state, the crank and the connecting rod are in a straight line, and the first pin hole of the crank and the fourth pin hole or the fifth pin hole or the sixth pin hole of the connecting rod are located on both sides of the second pin hole.

As a further improvement of the technology, the crank and the pedal shaft are connected by welding.

The design purposes of the first speed changing pin, the second speed changing pin, the third speed changing pin, the pulley and the steel wire rope are that when a fourth pin hole on the connecting rod is in butt joint with an eighth pin hole on the oscillating bar through the pins, the pedal is pedaled, and the pedal drives a pedal shaft to rotate; the pedal shaft drives the first speed change pin, the second speed change pin and the third speed change pin to swing around the central line of the supporting shaft through the crank, the connecting rod, the swing rod, the second shaft sleeve and the sector plate; the first speed changing pin presses the steel wire rope and penetrates through a space between the first pulley and the second pulley from bottom to top; the first speed changing pin presses and pulls the steel wire rope, so that the steel wire rope pulls the driven wheel to rotate; the driven wheel drives the rear wheel shaft to rotate through the one-way clutch; the driven wheel and the first shaft sleeve rotate relatively, so that the spiral spring deforms and stores energy; the rear wheel shaft drives the rear wheel of the tricycle to rotate, so that the tricycle moves forwards; in the process, the length of the steel wire rope is lengthened to be equal to twice of the swing amplitude of the first speed changing pin, namely the length of an arc line for pulling the driven wheel to rotate by the steel wire rope is twice of the swing amplitude of the first speed changing pin; when the pedals drive the crank to swing to 180 degrees, the crank drives the swing rod to swing through the connecting rod to the maximum amplitude, and the swing angle of the swing rod is 30 degrees; the pedals drive the crank to continuously swing around the central line of the pedal shaft through the pedal shaft; the crank drives the first speed changing pin, the second speed changing pin and the third speed changing pin to swing back through the connecting rod, the swing rod, the second shaft sleeve and the sector plate; the restoring force of the spiral spring makes the driven wheel rotate; the driven wheel drives the steel wire rope to rotate; the steel wire rope is wound on the outer circular surface of the driven wheel again; the steel wire rope is shortened and gradually tightened straight; when the crank swings to 360 degrees and returns to the initial position, the crank drives the first speed changing pin, the second speed changing pin and the third speed changing pin to return to the initial position through the connecting rod, the swing rod, the second shaft sleeve and the sector plate; the tricycle continues to move forwards under the action of inertia; the pedals are continuously treaded, the crank continuously swings from the initial position, the swing rod swings back and forth in a circulating and reciprocating manner, and the steel wire rope pulls the driven wheel in a circulating and reciprocating manner, so that the rear wheel of the tricycle continuously rotates, and the tricycle continuously moves forwards; when the tricycle needs to move at a higher speed, the tricycle needs to be replaced to a second gear, a fifth pin hole in the connecting rod is butted with a ninth pin hole in the swing rod through a pin, and the pedal drives a pedal shaft to rotate; the pedal shaft drives the first speed change pin, the second speed change pin and the third speed change pin to swing around the central line of the supporting shaft through the crank, the connecting rod, the swing rod, the second shaft sleeve and the sector plate; the first speed changing pin presses the steel wire rope and penetrates through a space between the first pulley and the second pulley from bottom to top; the first speed change pin presses and pulls the steel wire rope, so that the steel wire rope drives the rear wheel of the tricycle to rotate through the driven wheel, the one-way clutch and the rear wheel shaft; the tricycle is enabled to move forwards; meanwhile, the driven wheel and the first shaft sleeve rotate relatively, so that the volute spiral spring deforms and stores energy; before the crank swings to 30 degrees, the length of the lengthened steel wire rope is equal to twice of the swing amplitude of the first speed changing pin, namely the length of an arc line of the steel wire rope pulling the driven wheel to rotate is twice of the swing amplitude of the first speed changing pin; when the crank drives the swing rod to swing to 30 degrees through the connecting rod, the second speed change pin starts to contact with the steel wire rope and starts to press the steel wire rope; the crank continues to swing, and the second speed changing pin presses the steel wire rope and penetrates through a space between the second pulley and the third pulley from bottom to top; the first speed changing pin and the second speed changing pin press the steel wire rope together and enable the steel wire rope to pull the driven wheel to rotate; at the moment, the length of an arc line for pulling the driven wheel to rotate by the steel wire rope is four times of the swing amplitude of the sector plate, and the speed for driving the rear wheel to rotate by the driven wheel through the one-way clutch and the rear wheel shaft is twice of that before gear shifting; when the pedals drive the crank to swing to 180 degrees, the crank drives the swing rod to swing by the connecting rod to the maximum amplitude, and the swing angle of the swing rod is 60 degrees; the pedals drive the crank to continuously swing around the central line of the pedal shaft through the pedal shaft; the crank drives the first speed changing pin, the second speed changing pin and the third speed changing pin to swing back through the connecting rod, the swing rod, the second shaft sleeve and the sector plate; the restoring force of the spiral spring makes the driven wheel rotate; the driven wheel drives the steel wire rope to rotate; the steel wire rope is wound on the outer circular surface of the driven wheel again; the steel wire rope is shortened and gradually tightened straight; when the crank swings to 360 degrees and returns to the initial position, the crank drives the first speed changing pin, the second speed changing pin and the third speed changing pin to return to the initial position through the connecting rod, the swing rod, the second shaft sleeve and the sector plate; the tricycle continues to move forwards under the action of inertia; the pedals are continuously treaded, the crank continuously swings from the initial position, the swing rod circularly and reciprocally swings, the steel wire rope circularly and reciprocally pulls the driven wheel, so that the rear wheel of the tricycle continuously rotates, and the tricycle continuously moves forwards at the speed twice as fast as that before gear shifting; when the tricycle needs the fastest traveling speed, the tricycle needs to be replaced to a third gear, a sixth pin hole in a connecting rod is in butt joint with a tenth pin hole in a swing rod through a pin, and pedals are pedaled and drive pedal shafts to rotate; the pedal shaft drives the first speed change pin, the second speed change pin and the third speed change pin to swing around the central line of the supporting shaft through the crank, the connecting rod, the swing rod, the second shaft sleeve and the sector plate; the first speed changing pin presses the steel wire rope and penetrates through a space between the first pulley and the second pulley from bottom to top; the first speed change pin presses and pulls the steel wire rope, so that the steel wire rope drives the rear wheel of the tricycle to rotate through the driven wheel, the one-way clutch and the rear wheel shaft; the tricycle is enabled to move forwards; meanwhile, the driven wheel and the first shaft sleeve rotate relatively, so that the volute spiral spring deforms and stores energy; before the swing rod swings to 30 degrees, the length of the lengthened steel wire rope is equal to twice of the swing amplitude of the first speed changing pin, namely the length of an arc line for pulling the driven wheel to rotate by the steel wire rope is twice of the swing amplitude of the first speed changing pin; when the swing rod swings to 30 degrees, the second speed changing pin starts to contact with the steel wire rope and starts to press the steel wire rope; the crank continues to swing, and the second speed changing pin presses the steel wire rope and penetrates through a space between the second pulley and the third pulley from bottom to top; the first speed changing pin and the second speed changing pin press the steel wire rope together and enable the steel wire rope to pull the driven wheel to rotate; at the moment, the length of an arc line for pulling the driven wheel to rotate by the steel wire rope is four times of the swing amplitude of the sector plate, and the speed for driving the rear wheel to rotate by the driven wheel through the one-way clutch and the rear wheel shaft is twice of that before gear shifting; when the swing rod swings to 60 degrees, the third speed change pin starts to contact with the steel wire rope and starts to press the steel wire rope; the crank continues to swing, and the third speed changing pin presses the steel wire rope and penetrates through a space between the third pulley and the fourth pulley from bottom to top; when the pedal drives the crank to swing to 180 degrees, the crank drives the swing rod to swing by the connecting rod to the maximum amplitude, and the swing angle of the swing rod is 90 degrees; the pedals drive the crank to continuously swing around the central line of the pedal shaft through the pedal shaft; the crank drives the first speed changing pin, the second speed changing pin and the third speed changing pin to swing back through the connecting rod, the swing rod, the second shaft sleeve and the sector plate; the restoring force of the spiral spring makes the driven wheel rotate; the driven wheel drives the steel wire rope to rotate; the steel wire rope is wound on the outer circular surface of the driven wheel again; the steel wire rope is shortened and gradually tightened straight; when the crank swings to 360 degrees and returns to the initial position, the crank drives the first speed changing pin, the second speed changing pin and the third speed changing pin to return to the initial position through the connecting rod, the swing rod, the second shaft sleeve and the sector plate; the tricycle continues to move forwards under the action of inertia; the pedals are continuously treaded, the crank continuously swings from the initial position, the swing rod swings back and forth in a circulating and reciprocating mode, the steel wire rope pulls the driven wheel in a circulating and reciprocating mode, the rear wheel of the tricycle continuously rotates, and the tricycle continuously moves forwards at the speed which is three times that of the first gear.

In the invention, one end of the connecting rod, which is provided with the third pin hole, is connected with one end of the crank, which is provided with the second pin hole, through the pin, and the other end of the connecting rod, which is provided with the third pin hole, is positioned between the two cranks, so that the connecting rod is not hindered by the pedal shaft and the cranks in the movement process.

When a sanitation worker does not need to drive a bicycle at a high speed, the fourth pin hole in the connecting rod is butted with the eighth pin hole in the swing rod through a pin, so that the swing amplitude of the swing rod is fixed at 30 degrees; the pedal drives a pedal shaft to rotate; the pedal shaft drives the first speed change pin, the second speed change pin and the third speed change pin to swing around the central line of the supporting shaft through the crank, the connecting rod, the swing rod, the second shaft sleeve and the sector plate; the first speed changing pin presses the steel wire rope and penetrates through a space between the first pulley and the second pulley from bottom to top; the first speed changing pin presses and pulls the steel wire rope, so that the steel wire rope pulls the driven wheel to rotate; the driven wheel drives the rear wheel shaft to rotate through the one-way clutch; the driven wheel and the first shaft sleeve rotate relatively, so that the spiral spring deforms and stores energy; the rear wheel shaft drives the rear wheel of the tricycle to rotate, so that the tricycle moves forwards; in the process, the length of the steel wire rope is lengthened to be equal to twice of the swing amplitude of the first speed changing pin, namely the length of an arc line for pulling the driven wheel to rotate by the steel wire rope is twice of the swing amplitude of the first speed changing pin; when the pedal drives the crank to swing to 180 degrees, the crank drives the swing rod to swing by the connecting rod to the maximum amplitude, the swing angle of the swing rod is 30 degrees, and the second speed change pin and the third speed change pin do not act with the steel wire rope; the pedals drive the crank to continuously swing around the central line of the pedal shaft through the pedal shaft; the crank drives the first speed changing pin, the second speed changing pin and the third speed changing pin to swing back through the connecting rod, the swing rod, the second shaft sleeve and the sector plate; the restoring force of the spiral spring makes the driven wheel rotate; the driven wheel drives the steel wire rope to rotate; the steel wire rope is wound on the outer circular surface of the driven wheel again; the steel wire rope is shortened and gradually tightened straight; when the crank swings to 360 degrees and returns to the initial position, the crank drives the first speed changing pin, the second speed changing pin and the third speed changing pin to return to the initial position through the connecting rod, the swing rod, the second shaft sleeve and the sector plate; the tricycle continues to move forwards under the action of inertia; the pedals are continuously treaded, the crank continuously swings from the initial position, the swing rod swings back and forth in a circulating and reciprocating mode, and the steel wire rope pulls the driven wheel in a circulating and reciprocating mode, so that the rear wheel of the tricycle continuously rotates, and the tricycle continuously moves forwards.

When a sanitation worker needs to ride a bicycle at a higher speed, the bicycle is changed to a second gear, and a fifth pin hole in the connecting rod is butted with a ninth pin hole in the swing rod through a pin, so that the swing amplitude of the swing rod is fixed at 60 degrees; the pedal drives a pedal shaft to rotate; the pedal shaft drives the first speed change pin, the second speed change pin and the third speed change pin to swing around the central line of the supporting shaft through the crank, the connecting rod, the swing rod, the second shaft sleeve and the sector plate; the first speed changing pin presses the steel wire rope and penetrates through a space between the first pulley and the second pulley from bottom to top; the first speed change pin presses and pulls the steel wire rope, so that the steel wire rope drives the rear wheel of the tricycle to rotate through the driven wheel, the one-way clutch and the rear wheel shaft; the tricycle is enabled to move forwards; meanwhile, the driven wheel and the first shaft sleeve rotate relatively, so that the volute spiral spring deforms and stores energy; before the crank swings to 30 degrees, the length of the lengthened steel wire rope is equal to twice of the swing amplitude of the first speed changing pin, namely the length of an arc line of the steel wire rope pulling the driven wheel to rotate is twice of the swing amplitude of the first speed changing pin; when the crank drives the swing rod to swing to 30 degrees through the connecting rod, the second speed change pin starts to contact with the steel wire rope and starts to press the steel wire rope; the crank continues to swing, and the second speed changing pin presses the steel wire rope and penetrates through a space between the second pulley and the third pulley from bottom to top; the first speed changing pin and the second speed changing pin press the steel wire rope together and enable the steel wire rope to pull the driven wheel to rotate; at the moment, the length of an arc line for pulling the driven wheel to rotate by the steel wire rope is four times of the swing amplitude of the sector plate, and the speed for driving the rear wheel to rotate by the driven wheel through the one-way clutch and the rear wheel shaft is twice of that before gear shifting; when the pedals drive the crank to swing to 180 degrees, the crank drives the swing rod to swing by the connecting rod to the maximum amplitude, and the swing angle of the swing rod is 60 degrees; the pedals drive the crank to continuously swing around the central line of the pedal shaft through the pedal shaft; the crank drives the first speed changing pin, the second speed changing pin and the third speed changing pin to swing back through the connecting rod, the swing rod, the second shaft sleeve and the sector plate; the restoring force of the spiral spring makes the driven wheel rotate; the driven wheel drives the steel wire rope to rotate; the steel wire rope is wound on the outer circular surface of the driven wheel again; the steel wire rope is shortened and gradually tightened straight; when the crank swings to 360 degrees and returns to the initial position, the crank drives the first speed changing pin, the second speed changing pin and the third speed changing pin to return to the initial position through the connecting rod, the swing rod, the second shaft sleeve and the sector plate; the tricycle continues to move forwards under the action of inertia; the pedals are continuously treaded, the crank continuously swings from the initial position, the swing rod swings back and forth in a circulating and reciprocating mode, the steel wire rope pulls the driven wheel in a circulating and reciprocating mode, the rear wheel of the tricycle continuously rotates, and the tricycle continuously moves forwards at the speed twice as fast as the first gear.

When a sanitation worker needs to ride a bicycle at a higher speed, the bicycle is changed to a third gear, and a sixth pin hole in the connecting rod is butted with a tenth pin hole in the swing rod through a pin, so that the swing amplitude of the swing rod is fixed at 90 degrees; the pedal drives a pedal shaft to rotate; the pedal shaft drives the first speed change pin, the second speed change pin and the third speed change pin to swing around the central line of the supporting shaft through the crank, the connecting rod, the swing rod, the second shaft sleeve and the sector plate; the first speed changing pin presses the steel wire rope and penetrates through a space between the first pulley and the second pulley from bottom to top; the first speed change pin presses and pulls the steel wire rope, so that the steel wire rope drives the rear wheel of the tricycle to rotate through the driven wheel, the one-way clutch and the rear wheel shaft; the tricycle is enabled to move forwards; meanwhile, the driven wheel and the first shaft sleeve rotate relatively, so that the volute spiral spring deforms and stores energy; before the swing rod swings to 30 degrees, the length of the lengthened steel wire rope is equal to twice of the swing amplitude of the first speed changing pin, namely the length of an arc line for pulling the driven wheel to rotate by the steel wire rope is twice of the swing amplitude of the first speed changing pin; when the swing rod swings to 30 degrees, the second speed changing pin starts to contact with the steel wire rope and starts to press the steel wire rope; the crank continues to swing, and the second speed changing pin presses the steel wire rope and penetrates through a space between the second pulley and the third pulley from bottom to top; the first speed changing pin and the second speed changing pin press the steel wire rope together and enable the steel wire rope to pull the driven wheel to rotate; at the moment, the length of an arc line for pulling the driven wheel to rotate by the steel wire rope is four times of the swing amplitude of the sector plate, and the speed for driving the rear wheel to rotate by the driven wheel through the one-way clutch and the rear wheel shaft is twice of that before gear shifting; when the swing rod swings to 60 degrees, the third speed change pin starts to contact with the steel wire rope and starts to press the steel wire rope; the crank continues to swing, and the third speed changing pin presses the steel wire rope and penetrates through a space between the third pulley and the fourth pulley from bottom to top; when the pedal drives the crank to swing to 180 degrees, the crank drives the swing rod to swing by the connecting rod to the maximum amplitude, and the swing angle of the swing rod is 90 degrees; at the moment, the length of an arc line for pulling the driven wheel to rotate by the steel wire rope is six times of the swing amplitude of the sector plate, and the speed of the driven wheel driving the rear wheel to rotate through the one-way clutch and the rear wheel shaft is three times of that of the first gear; the pedals drive the crank to continuously swing around the central line of the pedal shaft through the pedal shaft; the crank drives the first speed changing pin, the second speed changing pin and the third speed changing pin to swing back through the connecting rod, the swing rod, the second shaft sleeve and the sector plate; the restoring force of the spiral spring makes the driven wheel rotate; the driven wheel drives the steel wire rope to rotate; the steel wire rope is wound on the outer circular surface of the driven wheel again; the steel wire rope is shortened and gradually tightened straight; when the crank swings to 360 degrees and returns to the initial position, the crank drives the first speed changing pin, the second speed changing pin and the third speed changing pin to return to the initial position through the connecting rod, the swing rod, the second shaft sleeve and the sector plate; the tricycle continues to move forwards under the action of inertia; the pedals are continuously treaded, the crank continuously swings from the initial position, the swing rod swings back and forth in a circulating and reciprocating mode, the steel wire rope pulls the driven wheel in a circulating and reciprocating mode, the rear wheel of the tricycle continuously rotates, and the tricycle continuously moves forwards at the speed which is three times that of the first gear.

Compared with the traditional speed change device, the speed change device does not need excessive precision machining; the relative cost is low, and the reliability is high; the speed change device can realize the speed which is three times of the first gear at most, and the whole device occupies smaller space, thereby providing proper space for subsequent upgrading and reconstruction; in addition, the whole device is driven by a steel wire rope, so that the steel wire rope has relatively low cost, easy maintenance and convenient replacement; the invention has simple structure and better use effect.

Drawings

Fig. 1 is an overall schematic view of a tricycle.

Fig. 2 is a partial schematic view of the transmission engaged with a tricycle.

Fig. 3 is a cross-sectional view of the transmission engaged with a tricycle.

Fig. 4 is a schematic view of a transmission mounting position.

Fig. 5 is a sectional view showing a mounting position of the transmission.

FIG. 6 is a schematic cross-sectional view of the swing link, the second shaft sleeve and the sector plate.

Fig. 7 is a schematic view of the crank.

Fig. 8 is a schematic view of a connecting rod.

Fig. 9 is a schematic view of a swing link.

FIG. 10 is a mating view of the sector plate, the first shift pin, the second shift pin and the third shift pin.

FIG. 11 shows the supporting block, the fixing block and the pulley.

FIG. 12 is a cross-sectional view of the rear axle, the first sleeve, the volute spiral spring, the one-way clutch and the driven wheel.

Fig. 13 is a schematic view of the driven wheel.

Fig. 14 is a simplified schematic of the transmission.

Number designation in the figures: 1. a rear wheel axle; 2. a pedal shaft; 3. a U-shaped cross beam; 4. a connecting rod; 5. a support shaft; 6. a second shaft sleeve; 7. a sector plate; 8. a second shaft hole; 9. a first shift pin; 10. a pulley; 11. a fixed block; 12. a wire rope; 13. a driven wheel; 14. a first shaft hole; 15. a movable circular groove; 16. a one-way clutch; 17. a volute spiral spring; 18. a first bushing; 19. a support block; 20. a crank; 21. a second pin hole; 22. a connecting rod; 23. a third pin hole; 24. a fourth pin hole; 25. a swing rod; 26. a passing cut; 27. a seventh pin hole; 28. an eighth pin hole; 29. a first pin hole; 30. a fifth pin hole; 31. a sixth pin hole; 32. a ninth pin hole; 33. a tenth pin hole; 34. a second shift pin; 35. and a third shift pin.

Detailed Description

As shown in fig. 1, 4 and 5, the rear wheel axle comprises a rear wheel axle 1, a pedal axle 2, a U-shaped cross beam 3, an engaging rod 4, a supporting axle 5, a second axle sleeve 6, a sector plate 7, a second axle hole 8, a first speed changing pin 9, a second speed changing pin 34, a third speed changing pin 35, a pulley 10, a fixed block 11, a steel wire rope 12, a driven wheel 13, a first axle hole 14, a movable circular groove 15, a one-way clutch 16, a volute spring 17, a first axle sleeve 18, a supporting block 19, a crank 20, a second axle hole 21, a connecting rod 22, a third axle hole 23, a fourth axle hole 24, a swing rod 25, a passing notch 26, a seventh axle hole 27, an eighth axle hole 28, a first axle hole 29, a fifth axle hole 30, a sixth axle hole 31, a ninth axle hole 32 and a tenth axle hole 33, wherein as shown in fig. 9, the end face of one end of; a through seventh pin hole 27 is formed between two opposite side surfaces at one end of the swing rod 25, and an eighth pin hole 28, a ninth pin hole 32 and a tenth pin hole 33 are sequentially formed at the other end; the eighth pin hole 28 communicates with the passage slit 26; the ninth pin hole 32 communicates with the passage cut 26; the tenth pin hole 33 communicates with the passage slit 26; as shown in fig. 4 and 6, one end of the swing link 25, which is provided with a seventh pin hole 27, is mounted in a U-shaped cut of the U-shaped cross beam 3 of the tricycle through the support shaft 5; as shown in fig. 5 and 6, the second shaft sleeve 6 is mounted on the support shaft 5 through a bearing whose inner circular surface is matched with the outer circular surface of the support shaft 5; one end of the second shaft sleeve 6 is fixedly connected with the side surface of the swing rod 25; as shown in fig. 10, the arc of the sector plate 7 is 90 degrees; a second shaft hole 8 is formed in the end face of the sector plate 7, close to the arc center; as shown in fig. 5 and 6, the sector plate 7 is nested on the outer circular surface of the second shaft sleeve 6 through the second shaft hole 8 and is fixedly connected with the outer circular surface; as shown in fig. 10, the first shift pin 9, the second shift pin 34, and the third shift pin 35 are mounted on the end face of the sector plate 7; the distance of the line connecting the center of the first shift pin 9 and the center of the second shaft hole 8 is smaller than the distance of the line connecting the center of the second shift pin 34 and the center of the second shaft hole 8; the distance of the line connecting the center of the second gearshift pin 34 and the center of the second shaft hole 8 is smaller than the distance of the line connecting the center of the third gearshift pin 35 and the center of the second shaft hole 8; an included angle is formed between a connecting line of the center of the first speed changing pin 9 and the center of the second shaft hole 8 and a connecting line of the center of the second speed changing pin 34 and the center of the second shaft hole 8; an included angle is formed between a connecting line of the center of the second shift pin 34 and the center of the second shaft hole 8 and a connecting line of the center of the third shift pin 35 and the center of the second shaft hole 8; an angle is formed between a line connecting the center of the first shift pin 9 and the center of the second shaft hole 8 and a line connecting the center of the third shift pin 35 and the center of the second shaft hole 8.

As shown in fig. 2 and 4, the supporting block 19 is mounted on the upper end surface of the U-shaped cross beam 3 of the tricycle through one end thereof; as shown in fig. 11, five pulleys 10 are respectively installed on one side of the supporting block 19 close to the sector plate 7 from top to bottom in sequence through pins, and the intervals between the five pulleys 10 are equal; as shown in fig. 5 and 13, the first pulley 10 and the second pulley 10 from bottom to top are engaged with the first shift pin 9, the second pulley 10 and the third pulley 10 are engaged with the second shift pin 34, and the third pulley 10 and the fourth pulley 10 are engaged with the third shift pin 35; as shown in fig. 11, the fixing block 11 is mounted on the supporting block 19 at a side close to the sector plate 7, and the fixing block 11 is located below the lowermost pulley 10.

As shown in fig. 7, the crank 20 has a first pin hole 29 and a second pin hole 21 formed at both ends thereof; as shown in fig. 4, the two cranks 20 are symmetrically mounted on the pedal shaft 2 through the engagement of the respective first pin holes 29 with the outer circumferential surface of the pedal shaft 2; as shown in fig. 8, one end of the connecting rod 22 is provided with a third pin hole 23, and the other end is provided with a fourth pin hole 24, a fifth pin hole 30 and a sixth pin hole 31 in sequence; as shown in fig. 4 and 5, one end of the connecting rod 22, which is provided with the third pin hole 23, is connected with one end of the crank 20, which is provided with the second pin hole 21, through a pin, and the end of the connecting rod 22, which is provided with the third pin hole 23, is positioned between the two cranks 20; as shown in fig. 3 and 5, one end of the connecting rod 22, which is provided with a fourth pin hole 24, is connected with one end of the swing rod 25, which is provided with an eighth pin hole 28, through a pin; the fourth pin hole 24 is matched with the eighth pin hole 28; the fifth pin hole 30 is matched with the ninth pin hole 32; the sixth pin hole 31 is matched with the tenth pin hole 33; the end of the link 22 with the fourth pin hole 24 is fitted with a pass through notch 26.

As shown in fig. 5, 12, the one-way clutch 16 is mounted on the rear wheel axle 1 through a fixed connection between its inner circular surface and the outer circular surface of the rear wheel axle 1; as shown in fig. 13, a movable circular groove 15 is formed in the center of one end face of the driven wheel 13; a first shaft hole 14 is formed in the center of the other end face of the driven wheel 13, and the first shaft hole 14 is communicated with the movable circular groove 15; as shown in fig. 5 and 12, the driven wheel 13 is nested on the outer circumferential surface of the one-way clutch 16 through the first shaft hole 14; the first shaft sleeve 18 is arranged on the rear wheel shaft 1 through the matching of the inner circular surface of the first shaft sleeve 18 and a bearing of the outer circular surface of the rear wheel shaft 1, and one end of the first shaft sleeve 18 is positioned in the movable circular groove 15 of the driven wheel 13; one end of the first shaft sleeve 18 extending out of the movable circular groove 15 is fixedly connected with a U-shaped cross beam 3 of the tricycle through a connecting rod 4; a volute spiral spring 17 is wound on the outer circular surface of the first shaft sleeve 18 and is positioned in the movable circular groove 15 of the driven wheel 13; two ends of the scroll spring 17 are respectively connected with the inner circular surface of the movable circular groove 15 and the outer circular surface of the first shaft sleeve 18; as shown in fig. 2 and 5, one end of the steel wire rope 12 is fixedly connected with the upper end surface of the fixed block 11, and the other end thereof is wound on the outer circumferential surface of the driven wheel 13 around the uppermost pulley 10; as shown in fig. 5 and 14, a wire rope 12 is fitted over five pulleys 10.

As shown in fig. 5, in the initial state, the first shift pin 9 is in contact with the wire.

As shown in fig. 10, the angle between the line connecting the center of the first shift pin 9 and the center of the second shaft hole 8 and the line connecting the center of the second shift pin 34 and the center of the second shaft hole 8 is 30 degrees.

As shown in fig. 10, an angle between a line connecting the center of the second shift pin 34 and the center of the second shaft hole 8 and a line connecting the center of the third shift pin 35 and the center of the second shaft hole 8 is 30 degrees.

As shown in fig. 10, an angle between a line connecting the center of the first shift pin 9 and the center of the second shaft hole 8 and a line connecting the center of the third shift pin 35 and the center of the second shaft hole 8 is 60 degrees.

As shown in fig. 4, in the initial state, the crank 20 and the connecting rod 22 are in a straight line, and the first pin hole 29 of the crank 20 and the fourth pin hole 24, the fifth pin hole 30 or the sixth pin hole 31 of the connecting rod 22 are located on both sides of the second pin hole 21.

As shown in fig. 5, the crank 20 is welded to the pedal shaft 2.

The design purposes of the first speed changing pin 9, the second speed changing pin 34, the third speed changing pin 35, the pulley 10 and the steel wire rope 12 are that when the fourth pin hole 24 on the connecting rod 22 is in butt joint with the eighth pin hole 28 on the swing rod 25 through pins, the pedal is pedaled, and the pedal drives the pedal shaft 2 to rotate; the pedal shaft 2 drives the first speed changing pin 9, the second speed changing pin 34 and the third speed changing pin 35 to swing around the central line of the supporting shaft 5 through the crank 20, the connecting rod 22, the swing rod 25, the second shaft sleeve 6 and the sector plate 7; the first speed changing pin 9 presses the steel wire rope 12 and penetrates between the first pulley 10 and the second pulley 10 from bottom to top; the first speed changing pin 9 presses and pulls the steel wire rope 12, so that the steel wire rope 12 pulls the driven wheel 13 to rotate; the driven wheel 13 drives the rear wheel shaft 1 to rotate through the one-way clutch 16; the driven wheel 13 and the first shaft sleeve 18 rotate relatively, so that the spiral spring 17 deforms and stores energy; the rear wheel shaft 1 drives the rear wheel of the tricycle to rotate, so that the tricycle moves forwards; in the process, the length of the steel wire rope 12 is lengthened to be equal to twice of the swinging amplitude of the first speed changing pin 9, namely the length of an arc line for pulling the driven wheel 13 to rotate by the steel wire rope 12 is twice of the swinging amplitude of the first speed changing pin 9; when the pedals drive the crank 20 to swing to 180 degrees, the crank 20 drives the swing rod 25 to swing to the maximum amplitude through the connecting rod 22, and the swing angle of the swing rod 25 is 30 degrees; the pedals drive the crank 20 to continuously swing around the central line of the pedal shaft 2 through the pedal shaft 2; the crank 20 drives the first speed changing pin 9, the second speed changing pin 34 and the third speed changing pin 35 to swing back and forth through the connecting rod 22, the swing rod 25, the second shaft sleeve 6 and the sector plate 7; the restoring force of the spiral spring 17 causes the driven pulley 13 to revolve; the driven wheel 13 drives the steel wire rope 12 to rotate; the steel wire rope 12 is wound on the outer circular surface of the driven wheel 13 again; the steel wire rope 12 is shortened and gradually tightened straight; when the crank 20 swings to 360 degrees and returns to the initial position, the crank 20 drives the first speed changing pin 9, the second speed changing pin 34 and the third speed changing pin 35 to return to the initial position through the connecting rod 22, the swing rod 25, the second shaft sleeve 6 and the sector plate 7; the tricycle continues to move forwards under the action of inertia; the pedals are continuously trodden, the crank 20 continuously swings from the initial position, the swing rod 25 swings back and forth in a circulating and reciprocating way, and the steel wire rope 12 pulls the driven wheel 13 in a circulating and reciprocating way, so that the rear wheel of the tricycle continuously rotates, and the tricycle continuously moves forwards; when the tricycle needs to move at a higher speed, the tricycle needs to be replaced to a second gear, a fifth pin hole 30 in the connecting rod 22 is butted with a ninth pin hole 32 in the swing rod 25 through a pin, and the tricycle pedals and pedals drive the pedal shaft 2 to rotate; the pedal shaft 2 drives the first speed changing pin 9, the second speed changing pin 34 and the third speed changing pin 35 to swing around the central line of the supporting shaft 5 through the crank 20, the connecting rod 22, the swing rod 25, the second shaft sleeve 6 and the sector plate 7; the first speed changing pin 9 presses the steel wire rope 12 and penetrates between the first pulley 10 and the second pulley 10 from bottom to top; the first speed change pin 9 presses and pulls the steel wire rope 12, so that the steel wire rope 12 drives the rear wheel of the tricycle to rotate through the driven wheel 13, the one-way clutch 16 and the rear wheel shaft 1; the tricycle is enabled to move forwards; meanwhile, the driven wheel 13 and the first shaft sleeve 18 rotate relatively, so that the spiral spring 17 deforms and stores energy; before the crank 20 swings to 30 degrees, the length of the steel wire rope 12 is elongated to be equal to twice of the swing amplitude of the first gearshift pin 9, namely, the length of an arc of the steel wire rope 12 pulling the driven wheel 13 to rotate is twice of the swing amplitude of the first gearshift pin 9; when the crank 20 drives the swing rod 25 to swing to 30 through the connecting rod 22, the second speed changing pin 34 starts to contact with the steel wire rope 12 and starts to press the steel wire rope 12; the crank 20 continues to swing, and the second speed changing pin 34 presses the steel wire rope 12 and penetrates through a position between the second pulley 10 and the third pulley 10 from bottom to top; the first shift pin 9 and the second shift pin 34 together press the wire rope 12 and cause the wire rope 12 to pull the driven pulley 13 to rotate; at the moment, the length of an arc line for pulling the driven wheel 13 to rotate by the steel wire rope 12 is four times of the swing amplitude of the sector plate 7, and the speed of the driven wheel 13 for driving the rear wheel to rotate through the one-way clutch 16 and the rear wheel shaft 1 is twice of that before gear shifting; when the pedals drive the crank 20 to swing to 180 degrees, the crank 20 drives the swing rod 25 to swing to the maximum amplitude through the connecting rod 22, and the swing angle of the swing rod 25 is 60 degrees; the pedals drive the crank 20 to continuously swing around the central line of the pedal shaft 2 through the pedal shaft 2; the crank 20 drives the first speed changing pin 9, the second speed changing pin 34 and the third speed changing pin 35 to swing back and forth through the connecting rod 22, the swing rod 25, the second shaft sleeve 6 and the sector plate 7; the restoring force of the spiral spring 17 causes the driven pulley 13 to revolve; the driven wheel 13 drives the steel wire rope 12 to rotate; the steel wire rope 12 is wound on the outer circular surface of the driven wheel 13 again; the steel wire rope 12 is shortened and gradually tightened straight; when the crank 20 swings to 360 degrees and returns to the initial position, the crank 20 drives the first speed changing pin 9, the second speed changing pin 34 and the third speed changing pin 35 to return to the initial position through the connecting rod 22, the swing rod 25, the second shaft sleeve 6 and the sector plate 7; the tricycle continues to move forwards under the action of inertia; the pedals are continuously trodden, the crank 20 continuously swings from the initial position, the swing rod 25 circularly and reciprocally swings back and forth, the steel wire rope 12 circularly and reciprocally pulls the driven wheel 13, so that the rear wheel of the tricycle continuously rotates, and the tricycle continuously moves forwards at the speed twice as fast as that before gear shifting; when the tricycle needs the fastest running speed, the tricycle needs to be replaced to a third gear, a sixth pin hole 31 on the connecting rod 22 is butted with a tenth pin hole 33 on the swing rod 25 through a pin, and pedals are pedaled and drive the pedal shaft 2 to rotate; the pedal shaft 2 drives the first speed changing pin 9, the second speed changing pin 34 and the third speed changing pin 35 to swing around the central line of the supporting shaft 5 through the crank 20, the connecting rod 22, the swing rod 25, the second shaft sleeve 6 and the sector plate 7; the first speed changing pin 9 presses the steel wire rope 12 and penetrates between the first pulley 10 and the second pulley 10 from bottom to top; the first speed change pin 9 presses and pulls the steel wire rope 12, so that the steel wire rope 12 drives the rear wheel of the tricycle to rotate through the driven wheel 13, the one-way clutch 16 and the rear wheel shaft 1; the tricycle is enabled to move forwards; meanwhile, the driven wheel 13 and the first shaft sleeve 18 rotate relatively, so that the spiral spring 17 deforms and stores energy; before the swing rod 25 swings to 30 degrees, the length of the steel wire rope 12 is lengthened to be twice of the swing amplitude of the first speed changing pin 9, namely the arc length of the steel wire rope 12 pulling the driven wheel 13 to rotate is twice of the swing amplitude of the first speed changing pin 9; when the swing rod 25 swings to 30, the second speed changing pin 34 starts to contact with the steel wire rope 12 and starts to press the steel wire rope 12; the crank 20 continues to swing, and the second speed changing pin 34 presses the steel wire rope 12 and penetrates through a position between the second pulley 10 and the third pulley 10 from bottom to top; the first shift pin 9 and the second shift pin 34 together press the wire rope 12 and cause the wire rope 12 to pull the driven pulley 13 to rotate; at the moment, the length of an arc line for pulling the driven wheel 13 to rotate by the steel wire rope 12 is four times of the swing amplitude of the sector plate 7, and the speed of the driven wheel 13 for driving the rear wheel to rotate through the one-way clutch 16 and the rear wheel shaft 1 is twice of that before gear shifting; when the swing rod 25 swings to 60 degrees, the third speed changing pin 35 starts to contact with the steel wire rope 12 and starts to press the steel wire rope 12; the crank 20 continues to swing, and the third speed changing pin 35 presses the steel wire rope 12 and penetrates through a space between the third pulley 10 and the fourth pulley 10 from bottom to top; when the pedals drive the crank 20 to swing to 180 degrees, the crank 20 drives the swing rod 25 to swing to the maximum amplitude through the connecting rod 22, and the swing angle of the swing rod 25 is 90 degrees; the pedals drive the crank 20 to continuously swing around the central line of the pedal shaft 2 through the pedal shaft 2; the crank 20 drives the first speed changing pin 9, the second speed changing pin 34 and the third speed changing pin 35 to swing back and forth through the connecting rod 22, the swing rod 25, the second shaft sleeve 6 and the sector plate 7; the restoring force of the spiral spring 17 causes the driven pulley 13 to revolve; the driven wheel 13 drives the steel wire rope 12 to rotate; the steel wire rope 12 is wound on the outer circular surface of the driven wheel 13 again; the steel wire rope 12 is shortened and gradually tightened straight; when the crank 20 swings to 360 degrees and returns to the initial position, the crank 20 drives the first speed changing pin 9, the second speed changing pin 34 and the third speed changing pin 35 to return to the initial position through the connecting rod 22, the swing rod 25, the second shaft sleeve 6 and the sector plate 7; the tricycle continues to move forwards under the action of inertia; the pedals are continuously stepped on, the crank 20 continuously swings from the initial position, the swing rod 25 circularly and reciprocally swings, the steel wire rope 12 circularly and reciprocally pulls the driven wheel 13, the rear wheel of the tricycle continuously rotates, and the tricycle continuously moves forwards at the speed three times that of the first gear.

In the invention, one end of the connecting rod 22 provided with the third pin hole 23 is connected with one end of the crank 20 provided with the second pin hole 21 through a pin, and the end of the connecting rod 22 provided with the third pin hole 23 is positioned between the two cranks 20, so that the connecting rod 22 is not hindered by the pedal shaft 2 and the cranks 20 in the movement process.

The specific implementation mode is as follows: when the sanitation worker does not need to drive a bicycle at a high speed, the fourth pin hole 24 on the connecting rod 22 is in pin joint with the eighth pin hole 28 on the swing rod 25, so that the swing amplitude of the swing rod 25 is fixed at 30 degrees; the pedal drives the pedal shaft 2 to rotate; the pedal shaft 2 drives the first speed changing pin 9, the second speed changing pin 34 and the third speed changing pin 35 to swing around the central line of the supporting shaft 5 through the crank 20, the connecting rod 22, the swing rod 25, the second shaft sleeve 6 and the sector plate 7; the first speed changing pin 9 presses the steel wire rope 12 and penetrates between the first pulley 10 and the second pulley 10 from bottom to top; the first speed changing pin 9 presses and pulls the steel wire rope 12, so that the steel wire rope 12 pulls the driven wheel 13 to rotate; the driven wheel 13 drives the rear wheel shaft 1 to rotate through the one-way clutch 16; the driven wheel 13 and the first shaft sleeve 18 rotate relatively, so that the spiral spring 17 deforms and stores energy; the rear wheel shaft 1 drives the rear wheel of the tricycle to rotate, so that the tricycle moves forwards; in the process, the length of the steel wire rope 12 is lengthened to be equal to twice of the swinging amplitude of the first speed changing pin 9, namely the length of an arc line for pulling the driven wheel 13 to rotate by the steel wire rope 12 is twice of the swinging amplitude of the first speed changing pin 9; when the pedals drive the crank 20 to swing to 180 degrees, the crank 20 drives the swing rod 25 to swing to the maximum extent through the connecting rod 22, the swing angle of the swing rod 25 is 30 degrees, and at the moment, the second speed change pin 34 and the third speed change pin 35 do not act on the steel wire rope 12; the pedals drive the crank 20 to continuously swing around the central line of the pedal shaft 2 through the pedal shaft 2; the crank 20 drives the first speed changing pin 9, the second speed changing pin 34 and the third speed changing pin 35 to swing back and forth through the connecting rod 22, the swing rod 25, the second shaft sleeve 6 and the sector plate 7; the restoring force of the spiral spring 17 causes the driven pulley 13 to revolve; the driven wheel 13 drives the steel wire rope 12 to rotate; the steel wire rope 12 is wound on the outer circular surface of the driven wheel 13 again; the steel wire rope 12 is shortened and gradually tightened straight; when the crank 20 swings to 360 degrees and returns to the initial position, the crank 20 drives the first speed changing pin 9, the second speed changing pin 34 and the third speed changing pin 35 to return to the initial position through the connecting rod 22, the swing rod 25, the second shaft sleeve 6 and the sector plate 7; the tricycle continues to move forwards under the action of inertia; the pedals are continuously stepped on, the crank 20 continuously swings from the initial position, the swing rod 25 swings back and forth in a circulating and reciprocating mode, the steel wire rope 12 pulls the driven wheel 13 in a circulating and reciprocating mode, the rear wheel of the tricycle rotates ceaselessly, and the tricycle continuously moves forwards.

When a sanitation worker needs to ride a bicycle at a higher speed, the bicycle is changed to a second gear, and the fifth pin hole 30 on the connecting rod 22 is butted with the ninth pin hole 32 on the swing rod 25 through a pin, so that the swing amplitude of the swing rod 25 is fixed at 60 degrees; the pedal drives the pedal shaft 2 to rotate; the pedal shaft 2 drives the first speed changing pin 9, the second speed changing pin 34 and the third speed changing pin 35 to swing around the central line of the supporting shaft 5 through the crank 20, the connecting rod 22, the swing rod 25, the second shaft sleeve 6 and the sector plate 7; the first speed changing pin 9 presses the steel wire rope 12 and penetrates between the first pulley 10 and the second pulley 10 from bottom to top; the first speed change pin 9 presses and pulls the steel wire rope 12, so that the steel wire rope 12 drives the rear wheel of the tricycle to rotate through the driven wheel 13, the one-way clutch 16 and the rear wheel shaft 1; the tricycle is enabled to move forwards; meanwhile, the driven wheel 13 and the first shaft sleeve 18 rotate relatively, so that the spiral spring 17 deforms and stores energy; before the crank 20 swings to 30 degrees, the length of the steel wire rope 12 is elongated to be equal to twice of the swing amplitude of the first gearshift pin 9, namely, the length of an arc of the steel wire rope 12 pulling the driven wheel 13 to rotate is twice of the swing amplitude of the first gearshift pin 9; when the crank 20 drives the swing rod 25 to swing to 30 through the connecting rod 22, the second speed changing pin 34 starts to contact with the steel wire rope 12 and starts to press the steel wire rope 12; the crank 20 continues to swing, and the second speed changing pin 34 presses the steel wire rope 12 and penetrates through a position between the second pulley 10 and the third pulley 10 from bottom to top; the first shift pin 9 and the second shift pin 34 together press the wire rope 12 and cause the wire rope 12 to pull the driven pulley 13 to rotate; at the moment, the length of an arc line for pulling the driven wheel 13 to rotate by the steel wire rope 12 is four times of the swing amplitude of the sector plate 7, and the speed of the driven wheel 13 for driving the rear wheel to rotate through the one-way clutch 16 and the rear wheel shaft 1 is twice of that before gear shifting; when the pedals drive the crank 20 to swing to 180 degrees, the crank 20 drives the swing rod 25 to swing to the maximum amplitude through the connecting rod 22, and the swing angle of the swing rod 25 is 60 degrees; the pedals drive the crank 20 to continuously swing around the central line of the pedal shaft 2 through the pedal shaft 2; the crank 20 drives the first speed changing pin 9, the second speed changing pin 34 and the third speed changing pin 35 to swing back and forth through the connecting rod 22, the swing rod 25, the second shaft sleeve 6 and the sector plate 7; the restoring force of the spiral spring 17 causes the driven pulley 13 to revolve; the driven wheel 13 drives the steel wire rope 12 to rotate; the steel wire rope 12 is wound on the outer circular surface of the driven wheel 13 again; the steel wire rope 12 is shortened and gradually tightened straight; when the crank 20 swings to 360 degrees and returns to the initial position, the crank 20 drives the first speed changing pin 9, the second speed changing pin 34 and the third speed changing pin 35 to return to the initial position through the connecting rod 22, the swing rod 25, the second shaft sleeve 6 and the sector plate 7; the tricycle continues to move forwards under the action of inertia; the pedals are continuously stepped on, the crank 20 continuously swings from the initial position, the swing rod 25 circularly and reciprocally swings, the steel wire rope 12 circularly and reciprocally pulls the driven wheel 13, the rear wheel of the tricycle continuously rotates, and the tricycle continuously moves forwards at the speed twice as fast as the first gear.

When a sanitation worker needs to ride a bicycle at a higher speed, the bicycle is changed to a third gear, and a sixth pin hole 31 on the connecting rod 22 is butted with a tenth pin hole 33 on the swing rod 25 through a pin, so that the swing amplitude of the swing rod 25 is fixed at 90 degrees; the pedal drives the pedal shaft 2 to rotate; the pedal shaft 2 drives the first speed changing pin 9, the second speed changing pin 34 and the third speed changing pin 35 to swing around the central line of the supporting shaft 5 through the crank 20, the connecting rod 22, the swing rod 25, the second shaft sleeve 6 and the sector plate 7; the first speed changing pin 9 presses the steel wire rope 12 and penetrates between the first pulley 10 and the second pulley 10 from bottom to top; the first speed change pin 9 presses and pulls the steel wire rope 12, so that the steel wire rope 12 drives the rear wheel of the tricycle to rotate through the driven wheel 13, the one-way clutch 16 and the rear wheel shaft 1; the tricycle is enabled to move forwards; meanwhile, the driven wheel 13 and the first shaft sleeve 18 rotate relatively, so that the spiral spring 17 deforms and stores energy; before the swing rod 25 swings to 30 degrees, the length of the steel wire rope 12 is lengthened to be twice of the swing amplitude of the first speed changing pin 9, namely the arc length of the steel wire rope 12 pulling the driven wheel 13 to rotate is twice of the swing amplitude of the first speed changing pin 9; when the swing rod 25 swings to 30, the second speed changing pin 34 starts to contact with the steel wire rope 12 and starts to press the steel wire rope 12; the crank 20 continues to swing, and the second speed changing pin 34 presses the steel wire rope 12 and penetrates through a position between the second pulley 10 and the third pulley 10 from bottom to top; the first shift pin 9 and the second shift pin 34 together press the wire rope 12 and cause the wire rope 12 to pull the driven pulley 13 to rotate; at the moment, the length of an arc line for pulling the driven wheel 13 to rotate by the steel wire rope 12 is four times of the swing amplitude of the sector plate 7, and the speed of the driven wheel 13 for driving the rear wheel to rotate through the one-way clutch 16 and the rear wheel shaft 1 is twice of that before gear shifting; when the swing rod 25 swings to 60 degrees, the third speed changing pin 35 starts to contact with the steel wire rope 12 and starts to press the steel wire rope 12; the crank 20 continues to swing, and the third speed changing pin 35 presses the steel wire rope 12 and penetrates through a space between the third pulley 10 and the fourth pulley 10 from bottom to top; when the pedals drive the crank 20 to swing to 180 degrees, the crank 20 drives the swing rod 25 to swing to the maximum amplitude through the connecting rod 22, and the swing angle of the swing rod 25 is 90 degrees; at the moment, the length of an arc line for pulling the driven wheel 13 to rotate by the steel wire rope 12 is six times of the swinging amplitude of the sector plate 7, and the speed of the driven wheel 13 for driving the rear wheel to rotate through the one-way clutch 16 and the rear wheel shaft 1 is three times of the first gear; the pedals drive the crank 20 to continuously swing around the central line of the pedal shaft 2 through the pedal shaft 2; the crank 20 drives the first speed changing pin 9, the second speed changing pin 34 and the third speed changing pin 35 to swing back and forth through the connecting rod 22, the swing rod 25, the second shaft sleeve 6 and the sector plate 7; the restoring force of the spiral spring 17 causes the driven pulley 13 to revolve; the driven wheel 13 drives the steel wire rope 12 to rotate; the steel wire rope 12 is wound on the outer circular surface of the driven wheel 13 again; the steel wire rope 12 is shortened and gradually tightened straight; when the crank 20 swings to 360 degrees and returns to the initial position, the crank 20 drives the first speed changing pin 9, the second speed changing pin 34 and the third speed changing pin 35 to return to the initial position through the connecting rod 22, the swing rod 25, the second shaft sleeve 6 and the sector plate 7; the tricycle continues to move forwards under the action of inertia; the pedals are continuously stepped on, the crank 20 continuously swings from the initial position, the swing rod 25 circularly and reciprocally swings, the steel wire rope 12 circularly and reciprocally pulls the driven wheel 13, the rear wheel of the tricycle continuously rotates, and the tricycle continuously moves forwards at the speed three times that of the first gear.

In the actual use process of the speed change mechanism, the sanitation tricycle is generally purchased by the government, and users of the tricycle may be old and weak, so that the sanitation tricycle is divided into three gears in design, and the government can adapt to different crowds by using different gears conveniently before purchasing and releasing. And the tricycle except the gear all belongs to necessary transmission structure other structures, has all fully used in three gears, does not have the structure of special gear, has saved the material and has improved the change efficiency.

In conclusion, the invention has the beneficial effects that: the speed change device does not need excessive precision processing; the chain wheel transmission device is relatively low in cost and high in reliability, and in addition, each chain wheel in the traditional variable speed chain is used in a specific gear for transmission, so that the chain wheel waste is caused; the speed change device can realize the speed which is three times of the first gear at most, and the whole device occupies smaller space, thereby providing proper space for subsequent upgrading and reconstruction; in addition, the whole device is driven by the steel wire rope 12, the steel wire rope 12 is low in relative cost, easy to maintain and convenient to replace.

Claims

1. The utility model provides a sanitation tricycle speed change gear which characterized in that: the transmission mechanism comprises a rear wheel shaft, a pedal shaft, a U-shaped crossbeam, a connecting rod, a supporting shaft, a second shaft sleeve, a sector plate, a second shaft hole, a first speed changing pin, a second speed changing pin, a third speed changing pin, a pulley, a fixed block, a steel wire rope, a driven wheel, a first shaft hole, a movable circular groove, a one-way clutch, a volute spring, a first shaft sleeve, a supporting block, a crank, a second pin hole, a connecting rod, a third pin hole, a fourth pin hole, a swing rod, a passing notch, a seventh pin hole, an eighth pin hole, a first pin hole, a fifth pin hole, a sixth pin hole, a ninth pin hole and a tenth pin hole, wherein the passing notch is formed in the end face of one; a through seventh pin hole is formed between two opposite side surfaces at one end of the swing rod, and an eighth pin hole, a ninth pin hole and a tenth pin hole are sequentially formed at the other end of the swing rod; the eighth pin hole is communicated with the passing notch; the ninth pin hole is communicated with the passing notch; the tenth pin hole is communicated with the passing notch; one end of the swing rod, which is provided with a seventh pin hole, is arranged in a U-shaped notch of a U-shaped cross beam of the tricycle through a support shaft; the second shaft sleeve is arranged on the supporting shaft through the matching of the inner circular surface of the second shaft sleeve and a bearing on the outer circular surface of the supporting shaft; one end of the second shaft sleeve is fixedly connected with the side surface of the swing rod; the radian of the sector plate is 90 degrees; a second shaft hole is formed in the end face of the sector plate, close to the arc center; the fan-shaped plate is nested on the outer circular surface of the second shaft sleeve through the second shaft hole and is fixedly connected with the second shaft sleeve; the first speed changing pin, the second speed changing pin and the third speed changing pin are arranged on the end surface of the sector plate; the distance between the center of the first speed change pin and the center of the second shaft hole is smaller than the distance between the center of the second speed change pin and the center of the second shaft hole; the distance between the center of the second shift pin and the center of the second shaft hole is smaller than the distance between the center of the third shift pin and the center of the second shaft hole; a certain included angle exists between a connecting line of the center of the first speed changing pin and the center of the second shaft hole and a connecting line of the center of the second speed changing pin and the center of the second shaft hole; a certain included angle exists between a connecting line of the center of the second speed changing pin and the center of the second shaft hole and a connecting line of the center of the third speed changing pin and the center of the second shaft hole; a certain included angle exists between a connecting line of the center of the first speed changing pin and the center of the second shaft hole and a connecting line of the center of the third speed changing pin and the center of the second shaft hole;

the supporting block is arranged on the upper end surface of a U-shaped cross beam of the tricycle through one end of the supporting block; the five pulleys are respectively and sequentially arranged on one side, close to the sector plate, of the supporting block from top to bottom through pins, and the distances among the five pulleys are equal; a first pulley and a second pulley are matched with a first speed changing pin from bottom to top, a second pulley and a third pulley are matched with a second speed changing pin, and a third pulley and a fourth pulley are matched with a third speed changing pin; the fixed block is arranged on one side, close to the sector plate, of the supporting block and is positioned below the pulley at the lowest part;

a first pin hole and a second pin hole are respectively formed in the two ends of the crank; the two cranks are symmetrically arranged on the pedal shaft through the matching of the respective first pin holes and the outer circular surface of the pedal shaft; one end of the connecting rod is provided with a third pin hole, and the other end of the connecting rod is sequentially provided with a fourth pin hole, a fifth pin hole and a sixth pin hole; one end of the connecting rod, which is provided with a third pin hole, is connected with one end of the crank, which is provided with a second pin hole, through a pin, and the end of the connecting rod, which is provided with the third pin hole, is positioned between the two cranks; one end of the connecting rod, which is provided with a fourth pin hole, is connected with one end of the oscillating bar, which is provided with an eighth pin hole, through a pin; the fourth pin hole is matched with the eighth pin hole; the fifth pin hole is matched with the ninth pin hole; the sixth pin hole is matched with the tenth pin hole; one end of the connecting rod, which is provided with a fourth pin hole, is matched with the passing notch;

2. The tricycle speed change device of claim 1, wherein: in an initial state, the first shift pin is in contact with the wire.

3. The tricycle speed change device of claim 1, wherein: an included angle between a connecting line of the center of the first shift pin and the center of the second shaft hole and a connecting line of the center of the second shift pin and the center of the second shaft hole is 30 degrees.

4. The tricycle speed change device of claim 1, wherein: an included angle between a line connecting the center of the second shift pin and the center of the second shaft hole and a line connecting the center of the third shift pin and the center of the second shaft hole is 30 degrees.

5. The tricycle speed change device of claim 1, wherein: an angle between a line connecting the center of the first shift pin and the center of the second shaft hole and a line connecting the center of the third shift pin and the center of the second shaft hole is 60 degrees.

6. The tricycle speed change device of claim 1, wherein: in an initial state, the crank and the connecting rod are in a straight line, and the first pin hole of the crank and the fourth pin hole or the fifth pin hole or the sixth pin hole of the connecting rod are positioned on two sides of the second pin hole.

7. The tricycle speed change device of claim 1, wherein: the crank and the pedal shaft are connected by welding.