CN2045720U

CN2045720U - Double-chain automatic shifting device

Info

Publication number: CN2045720U
Application number: CN 89201608
Authority: CN
Inventors: 王宝弟; 宋德安
Original assignee: Individual
Current assignee: Individual
Priority date: 1989-02-03
Filing date: 1989-02-03
Publication date: 1989-10-11

Abstract

The utility model discloses a double-chain automatic shifting device used for the shifting device of man-power vehicles. The utility model is mainly composed of a left and a right bell crank, a driving clutch-lamellae and a slaving clutch-lamellae, a large and a small chain wheel, a large and a small fly wheel, a left and a right chain, and a dust-proof cover. In general situation, the bell crank is trod by feet, the small fly wheel on a rear shaft is drove by the large chain wheel for rapid running. When the vehicle is in the upslope, the resistance force increases, the resistance force acting on a steel ball from the driving and the slaving clutch-lamellae increase, and the axial force generates. Therefore, at last the steel ball is forced to leave the circular pit center on the driving clutch-lamellae, the slaving clutch-lamellae loses the driving force for the vehicle, and only the small chain wheel drives the large fly wheel for rotation to make the vehicle slow down and complete the speed change.

Description

Double-chain automatic shifting device

The utility model is the driving transmission system that belongs to human powered vehicle.

Our common human powered vehicle generally is a kind of transmitting ratio at present, and when heavy duty or when going up a slope, just unable usefulness is foot-operated travels, and have to get off to carry out or look for the people to help to draw and could walk.

The purpose of this utility model is the automatic shift device that proposes a kind of simple human powered vehicle newly, when heavy duty or upward slope, travels smoothly by automatic speed changing.

Double-stranded bar automatic shift device mainly is made up of left and right crank throw, active clutch sheet, driven clutch segment, hinge wheel, minor sprocket, big flywheel, small flywheel, right chain, left chain, dust boot, axis, plain bearing and key, as shown in Figure 1.Crank throw is fixed together with pin and axis.The active clutch sheet is fixed with rivet and minor sprocket, connects by key and right crank throw, axis again.Driven clutch segment is fixed with rivet and hinge wheel, and disk spring and nut lean against hinge wheel left side, regulates pressure between active clutch sheet and the driven clutch segment with nut.Plain bearing is contained in the axis hole of driven clutch segment, is enclosed within on the axis, and hinge wheel, driven clutch segment can be rotated on axis or slide.The left side of hinge wheel is fixed a ratchet or go out several prominent points on hinge wheel and replaces ratchet.The structure of active clutch sheet is shown in Fig. 2,3: three degree of depth of rectangular distribution are equipped with steel ball less than the round pool of steel ball radius in the round pool on disk.Driven clutch segment is shown in Fig. 4,5: being uniform-distribution with three two ends on its disk is circular skewed slots, and the center of circle, outer end of skewed slot is concentric with the center of circle of the round pool of master clutch sheet.Steel ball is in the round pool and driven clutch segment skewed slot outer end of active clutch sheet at ordinary times.The disc centre in the line of centers of skewed slot and the center of circle, groove outer end be wired to 35 °-40 ° angle.The bottom of skewed slot is shallow slope, dark inner end, an outer end, and the outer end degree of depth is greater than the radius of steel ball, and when steel ball was rolled into the inner end of skewed slot, the active clutch sheet can skid on steel ball.Hinge wheel, minor sprocket are separately by the small flywheel on left and right chain and the rear axle, flywheel connects greatly.

Under general situation, when driving left and right crank throw with pin, because the connection of power-transfer clutch, minor sprocket and hinge wheel rotate with crank throw simultaneously, at this moment the cireular frequency of two sprocket wheels is the same, but the linear velocity on the tooth of hinge wheel is greater than the linear velocity on the minor sprocket tooth, so just advanced by the small flywheel twirl powered vehicle that left chain drives on the rear axle by hinge wheel.Minor sprocket drives big flywheel by right chain and makes slow rotation, and its velocity contrast is skidded and balance on rear axle by big flywheel.

Resistance increases when rickshaw goes up a slope, and the power that is added on the crank throw strengthens, and makes driving and driven clutch segment act on turning round on the steel ball and adds increase.Because the round pool degree of depth on the active clutch sheet disk is less than the steel ball radius, twisting force is on the steel ball inclined-plane, make between steel ball and the active clutch sheet and produce axial force, promote driven clutch segment and remove to compress disk spring, make steel ball break away from the round pool that coil in active clutch sheet garden fully at last, skewed slot along driven clutch segment is rolled to the groove inner end, left round pool center on the active clutch sheet disk, the active clutch sheet is slided on steel ball, at this moment just lost the driving of car big from dynamic clutch, hinge wheel just skids on axis, has only the propulsive effort on the minor sprocket, and the big flywheel that drives on the rear axle by right chain rotates, finish speed change, powered vehicle is travelled at a slow speed, though propulsive effort reduces people bicycle running that still can do as usual.After finishing uphill road and travelling, when needing the former speed of recovery to travel, as long as once with the slight back-pedalling of crank throw, by being fixed on the ratchet and the ratchet that is fixed on the hinge wheel left side on the vehicle body, make the hinge wheel counter-rotating and produce bigger resistance, as described above, driven clutch segment and hinge wheel are fixed together, at this moment the driven relatively clutch segment counter-rotating of active clutch sheet, the skewed slot that steel ball is obedient on the dynamic clutch disk rolls position outward, fall into simultaneously in the round pool of active clutch sheet, just can recover the situation of original fast running.

The utility model compared with prior art, its preceence is when human powered vehicle heavy duty or when going up a slope, conversion transmitting ratio automatically is though speed reduction at this moment all obtains the labour-saving effect.It is gauge member that this device mostly divides part, and not only simple structure is made, assembled easily, and cost is low, and is practical.

Description of drawings:

Fig. 1 is the constructional drawing of double-stranded bar automatic shift device.

1 steel ball, 2 left crank throws, 3 pins, 4 rivets, 5 nuts, 6 disk springs, 7 keys, 8 minor sprockets, 9 hinge wheels, 10 left chains, 11 right chains, 12 big flywheels, 13 small flywheels, 14 dust boots, 15 active clutch sheets, 16 driven clutch segments, 17 plain bearings, 18 axis, 19 right crank throws, 20 Xiao Ding, 21 ratchets, 22 ratchets.

The front view of Fig. 2 active clutch sheet;

The lateral plan of Fig. 3 active clutch sheet;

The front view of the driven clutch segment of Fig. 4;

The lateral plan of the driven clutch segment of Fig. 5.

The embodiment of double-stranded bar automatic shift device: double-stranded bar automatic shift device is assembled by left and right crank throw, active clutch sheet, driven clutch segment, hinge wheel, minor sprocket, big flywheel, small flywheel, ratchet, ratchet, axis, dust boot, steel ball, pin, rivet.Left and right crank throw, large and small sprocket wheel, large and small flywheel, the optional general part of left and right chain, steel ball, pin, rivet, nut, key all are gauge members.Dust boot A ₃Zinc-plated after the steel truck system, active clutch sheet and driven clutch segment adopt No. 45 steel cars, mill the back fire preparing becomes shape shown in Fig. 2,3,4,5.Be uniform-distribution with three round pools on the disk of active clutch sheet, for the dress steel ball is used.Three skewed slots of rectangular distribution on the disk of driven clutch segment, the skewed slot two ends are circular, the center of circle of the round pool on the center of circle of outer end and the active clutch sheet is concentric, the bottom of groove be processed into outer dark in shallow slope, the outer end degree of depth is greater than the radius of steel ball.Driving and driven clutch segment also can be processed into the inserted pattern of convex-concave by above-mentioned material, can replace the transmission of above-mentioned steel ball, adopts this pattern can save ratchet and pawl.Ratchet mills ratchet after with No. 45 steel car systems, also can replace the effect of ratchet in the pattern that hinge wheel goes out several prominent points by disk spring one side blow, and ratchet is with spring steel plate pincers worker self-control.

Two nuts are contained on the axis, put disk spring, with rivet hinge wheel and driven clutch segment riveting are in the same place, ratchet is fixed on the hinge wheel, and plain bearing is contained in the axis hole of driven clutch segment, is enclosed within on the axis again.Dust boot is enclosed within on the active clutch sheet, with rivet active clutch sheet and minor sprocket riveting together after, connect with axis with key, with Xiao Ding left and right crank throw is fixed on the axis again, ratchet is contained in and leans against ratchet on the vehicle body, large and small flywheel is contained on the rear axle, puts left and right chain and forms double-stranded bar automatic shift device.

Claims

1, a kind of double-stranded bar automatic shift device, comprise hinge wheel, minor sprocket, the active clutch sheet, driven clutch segment, steel ball, left chain, right chain, big flywheel, small flywheel, left and right sides crank throw, nut, axis, it is characterized in that two nuts are contained on the axis, put disk spring, ratchet is fixed on the left side of hinge wheel, with rivet hinge wheel and driven clutch segment riveting are in the same place, three skewed slots of rectangular distribution on the disk of driven clutch segment, plain bearing is contained in the axis hole of driven clutch segment, be enclosed within on the axis again, dust boot is enclosed within on the active clutch sheet, with rivet with the active clutch sheet with minor sprocket riveting be in the same place, three round pools of rectangular distribution on the disk of active clutch sheet, connect with axis with key, Xiao Ding is a left side, right crank throw is fixed on axis, and ratchet is fixed on the vehicle body, greatly, small flywheel is installed on the rear axle, with a left side, right chain is big, minor sprocket is with big, small flywheel is linked together forms double-stranded bar automatic shift device.

2, double-stranded bar automatic shift device according to claim 1, it is inserted to it is characterized in that active clutch sheet and driven clutch segment also can be made into convex-concave.

3, double-stranded bar automatic shift device according to claim 1 is characterized in that and can lean on a side blow of disk spring go out the pattern of several prominent points at hinge wheel.