CN2180582Y - Tricycle speed changing device - Google Patents

Abstract

Disclosed is a speed changing device for tricycles. The utility model belongs to the speed changing mechanism for pedal manpower cycles, in particular to the speed changing device for manpower tricycles. Two middle drive shafts are arranged between the big and the small chain wheels of the existing tricycle; each shaft is provided with a big chain wheel and a small chain wheel; the big chain wheel of one shaft and the small chain wheel of the other shaft are driven by a chain; a clutch is arranged between the big and the small chain wheels of each shaft; the clutch is shifted by a control mechanism composed of a rod, a tension spring, etc., to change high speed and low speed of the tricycle. The device has simple and compact structure and convenient and reliable speed change, and can be assembled with the unchangeable structure of the existing tricycle, and the whole manufacturing cost is lower.

Description

Tricycle speed changing device

The utility model relates to the change-speed box of a kind of change-speed box of pedal man car, particularly manual tricycle.

Traditional manual tricycle does not have transmission system, and the quite effort of riding particularly is loaded with weight or when going up a slope, even between twenty and fifty people also is difficult to be competent at, so the elderly and women seldom have the work of drawing three-wheel vehicle of being engaged in.For a change present this situation discloses many technical schemes in the Chinese patent literature, can make three-wheel vehicle laborsaving really according to these technical schemes, but also come with some shortcomings.With CN87200727 is example, and (1) its chain is long, and the loosening chain that takes off easily takes place; (2) structure is not too compact, attractive in appearance inadequately; (3) parts such as ratchet wherein, cam belong to non-standard component, and processing is difficulty, have increased the cost of entire mechanism.

The purpose of this utility model provides a kind of three-wheel vehicle speed-changing mechanism, and its compact conformation is rationally distributed, and chain is difficult for loosening, and part wherein is easy to manufacture, and cost is lower, and installation and maintenance are easy.

The utility model is realized with following proposal:

Between the large and small sprocket wheel of existing three-wheel vehicle, two transmission shafts have been installed, hinge wheel and minor sprocket all are housed on the every axle, hinge wheel on axle all with another root axle on minor sprocket be connected with chain gear, be set with a power-transfer clutch between this described large and small sprocket wheel on every axle, the toggle mechanism of power-transfer clutch by with the interconnective rod member of hinge, with the extension spring of rod member bonded assembly be fixed on rod member on the shifting part that links to each other with two power-transfer clutchs again constitute.

Below, an embodiment of the present utility model who provides according to Figure of description is described in further detail its structure

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

Each label is represented successively among the figure: joystick 1, decide fulcrum 2, moving node 3, pipe link 4, spider 5, decide fulcrum 6, traction steel rope of cable 7, leading sheave 8,9, pull bar 10, low gear chain 11, single groove is stirred pulley 12, extension spring 13, high speed gear chain 14, low-speed clutch 15, dive key 16, minor sprocket 17, transmission shaft 18,27, bearing 19,25,26,31,35, trailing wheel 20, drive shaft of rear wheel 21, minor sprocket 22, trailing wheel messenger chain 23, minor sprocket 24, hinge wheel 28, high-speed clutch 29, minor sprocket 30, hinge wheel 32, active messenger chain 33, hinge wheel 34, stretcher 36, pin 37, hole 38, groove 39.

Referring to accompanying drawing, between hinge wheel 34 that has three-wheel vehicle now and minor sprocket 22, two tween drive spindles 18 and 27 have been adorned, every transmission shaft 18, hinge wheel 28 and minor sprocket 17 all are housed on 27,30, hinge wheel 28 on axle all with another root axle on minor sprocket 17,30 by chain 11,14 are in transmission connection, at every transmission shaft 18,27 hinge wheel 28 and minor sprocket 17, be set with power- transfer clutch 15 and 29 between 30, transmission shaft 18, power-transfer clutch 15 on 27,29 slip locations parts are equipped with dive key 16, the pin 37 that all has projection on the power- transfer clutch 15 and 29 cooperates with hole 38 on the hinge wheel 28.Making the toggle mechanism that promptly closes device 15,29 slippages is by the rod member 1,4,5,10 that is interconnecting with hinge, and with rod member 10 bonded assembly extension springs 13 be fixed on the rod member 10 and constitute with two power-transfer clutchs, 15,29 bonded assembly shifting parts again, this shifting part is the disc of band groove 39, promptly the edge of stirring pulley 12, two power- transfer clutchs 15,29 of the single groove among the figure is set in single groove and stirs in the groove 39 of pulley 12.

That is adorned on transmission shaft 27 is identical with three-wheel vehicle hinge wheel 34 chain bonded assembly hinge wheels 32 both numbers of teeth, and its specification is t=1/2 ¨, the z=36 tooth; Adorned on the transmission shaft 18 with drive shaft of rear wheel 21 on minor sprocket 22 chain bonded assembly minor sprockets 24, its both numbers of teeth are identical, specification is t=1/2 ¨, z=20～22 teeth.The large and small sprocket wheel 28,17 at power- transfer clutch 15,29 two ends and 30 specification adopt, the t=1/2 ¨ of hinge wheel 28, z=36 tooth; The t=1/2 ¨ of minor sprocket 17,30, the z=18 tooth.When level road or underloading are ridden, extension spring 13 pulls to high-speed clutch 29 hinge wheel 28 on the transmission shaft 27 automatically, and the pin 37 of projection is inserted in the hole 38 above it, thereby makes drive shaft of rear wheel 21 high speed rotating; When in uphill road or heavy duty, inwardly stir joystick 1, through transmission between each pivotally attached bar, pull bar 10 is moved, drive single groove and stir pulley 12 and move, make high-speed clutch 29 break away from hinge wheels 28, simultaneously low-speed clutch 15 with close at coaxial hinge wheel 28, reach low speed driving, save the purpose of strength.

By such scheme of the present utility model, can reach the purpose of laborsaving and speed change easily, the high speed speed ratio is 2:1, the low speed speed ratio is 1:2 and laborsaving reaching more than 3 times; Adopted two tween drive spindles, made messenger chain, be difficult for producing the loosening and break-off of chain apart from shorter; It is simple in structure, installation is easy, can adorn on new car, can on used car, adorn again, and for ease of maintenaince; Parts are less, adopt gauge member mostly, so part is easy to manufacture, cost is lower.

Claims (3)

1, a kind of three-wheel vehicle transmission system, it is characterized in that between the large and small sprocket wheel of existing three-wheel vehicle, two transmission shafts being installed, hinge wheel and minor sprocket all are housed on the every axle, hinge wheel on axle all with another root axle on minor sprocket be connected with chain gear, be set with a power-transfer clutch between this described large and small sprocket wheel on every axle, the toggle mechanism of power-transfer clutch by with the interconnective rod member of hinge, with the extension spring of rod member bonded assembly be fixed on rod member on the shifting part that links to each other with two power-transfer clutchs again constitute.

2, by the described three-wheel vehicle transmission system of claim 1, dive key is equipped with in clutch slip position at each transmission shaft, the pin that has projection on the power-transfer clutch, match with hole big on the hinge wheel, the shifting part that links to each other with two power-transfer clutchs is the disc that has groove, the edge of two power-transfer clutchs is set in this groove, its number of teeth of the sprocket wheel that is in transmission connection with the three-wheel vehicle hinge wheel on transmission shaft is identical with hinge wheel, and its number of teeth of the sprocket wheel that is in transmission connection with the three-wheel vehicle minor sprocket on the transmission shaft is identical with minor sprocket.

3, by the described three-wheel vehicle transmission system of claim 2, the large and small sprocket wheel specification that it is characterized in that the power-transfer clutch two ends on the every transmission shaft is, hinge wheel t=1/2 ¨, the z=36 tooth, minor sprocket t=1/2 ¨, z=18 tooth, the sprocket wheel t=1/2 ¨ that is in transmission connection with the three-wheel vehicle hinge wheel, the z=36 tooth, the sprocket wheel that is in transmission connection with the three-wheel vehicle minor sprocket is t=1/2 ¨, z=20～22 teeth.

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