CN2395973Y - Crank transmission for pedal manpower cycle - Google Patents

Abstract

The utility model discloses a crank transmission for a pedal manpower bicycle. Both ends of a middle shaft sleeve are respectively and fixedly provided with an inner and an outer cams, a middle shaft neck at the outer side is respectively and fixedly provided with main cranks mutually at an angle of 180 DEG, and a driving chain wheel is fixed at the side provided with the main cranks; both ends of the middle shaft neck are sheathed movably with an auxiliary crank, an outer end of a small shaft passing through rod bodies of the main and the auxiliary cranks is respectively and fixedly provided with a main and an auxiliary rocking arms connected with hinges at one end part, the other end is respectively and fixedly provided with a slide block pressed on slide ways of the inner and the outer cams to apply force to the side provided with the auxiliary cranks and to drive the opposite main cranks to push off the rocking arms, so the auxiliary cranks can rotate at an angle bigger than that of the main cranks to pass round a zero tension arm point. Therefore, the utility model can run with less labor.

Description

The crank load transfer device of pedal man car

The utility model belongs to manpower bicycle's crank load transfer device.

The driving of common pedal man car, the bipod that is the people constantly scrunches the stretcher that is installed in two crank ends, rotate by the crank drive axis of 180 ° of twenty percents and the drive sprocket of fixing on it, drive with the wheel that is fixed together by movable sprocket by chain again and roll on the ground.Because driving left and right sides crank changes at any time around the arm of force that axis rotates, when two cranks go to when perpendicular to the ground, the arm of force equals zero, pin firmly can not be done downwards, when turning over zero-g arm point, the arm of force increases gradually, and is under resistance unmodified situation, more and more laborsaving, when two cranks go to when parallel to the ground, the arm of force is the longest, is rotated further, and the arm of force diminishes again gradually until forwarding the zero-g arm to, also promptly when the crank of a side rotates 360 °, occurring zero-g arm point twice, in this case, generally is to lean on the force of inertia of car or make the sole change scrunch the direction band zero passage arm of force point crank is rotated further.But when being in upward slope or heavy duty as if rickshaw, it is just relatively more difficult to overcome zero-g arm point.

The purpose of this utility model provides a kind of can make crank turn to nearly zero-g arm point the time, and the crank of a side does not take the crank load transfer device that extra strength is promptly walked around zero-g arm point.

For achieving the above object, the technical solution of the utility model is, at bottom bracket axle two ends, vehicle frame bottom, symmetrically respectively be installed with the interior and exterior cam of raised points position that staggers mutually to both sides successively, the cam outside is fixed with the main crank that is 180 ° of angles mutually respectively on middle shaft neck, between cam that power transmission chain one side is arranged and main crank the drive sprocket that is fixed together with main crank is arranged; On the middle axle journal in the outside of two main cranks, sliding sleeve has auxiliary crank respectively, on the body of rod of major and minor crank, leave hole perpendicular to the body of rod, be installed with little axle in the hole respectively, be fixed with respectively and vertical master rocker and the secondary-rocker of little axle in the direction termination that little axle points to the axis two ends, the end hinge of major and minor rocking arm connects; Point to cam one end at little axle and be fixed with inner slide and outer slide respectively, and be pressed in respectively on the slideway of each self-corresponding interior and exterior cam, when the inner slide of nearly sprocket wheel end raised position at its cooresponding cam ring, the inner slide of homonymy is in the recessed position of external cam, simultaneously on the raised position of outer slide in its cooresponding external cam of sprocket wheel end, the inner slide of its homonymy is recessed position under cam ring, the major and minor rocking arm of a side also together at this moment, the inclined to one side zero passage arm of force point of auxiliary crank, the major-minor rocking arm of opposite side is in and struts the position.

A because left side, the power of pedaling of right bipod is to impose on the auxiliary crank of the left and right sides, again respectively by being through the master, hinged rocking arm on the auxiliary crank is passed to a left side that is fixed together with axis, right main crank, thereby drive wheels is advanced, and the slide block of the other end of rocking arm is pressed in respectively on separately the cam slideway, when the auxiliary crank of a side is depressed, the slide block that links to each other with auxiliary crank is pressed in the high spot of cam, slide block is by jack-up, drive secondary-rocker and push away master rocker, drive main crank again power is passed to axis, axis drives the main crank of opposite side, and the slide block on it is by jack-up, and the auxiliary crank that promotes opposite side by rocking arm rotates; When the auxiliary crank that is depressed commentaries on classics goes near directed towards ground, its inner slide slides to concave point from the salient point of cam ring, and the outer slide of homonymy begins to enter the raised points of external cam, its major and minor rocking arm is strutted gradually, main crank drives axis and turns over one greater than by the angle of the auxiliary crank of the application of force, thereby the main crank that drives the opposite also turns over same big angle and has walked around last zero-g arm point, and the people can make car move on the downward application of force of pin again in the same way as described above.Going up a slope to pedal or during heavy duty, it is just very easy to make crank turn over zero-g arm point.

The utility model is described in further detail below in conjunction with drawings and Examples.

Fig. 1 is the front view of the crank load transfer device of pedal man car;

Fig. 2 is the birds-eye view of Fig. 1;

Fig. 3 is for being equipped with the front view of roller on the slide block shown in Figure 1;

Fig. 4 is the figure that bows of Fig. 3.

Among Fig. 1, putting of axle sleeve 8 (referring to Fig. 2) two ends of vehicle frame bottom axis 7, symmetrically respectively be fixed with interior and exterior cam 9,10 and 18,19 to left and right both sides successively, on the axle journal of the both sides axis 7 outside it, be fixed with the left and right main crank 4,14 that is 180 ° mutually with taper pin respectively, between external cam 19 that power transmission chain one side is arranged and main crank 14, the drive sprocket 11 that is fixed together with main crank 14 is arranged; On the two ends axle journal of the axis 7 in the outside of two main cranks 4 and 14, be with auxiliary crank 1 and 17 respectively rotationally, because the rotation of main crank 4 and 14 is by auxiliary crank 1 and 17 power of transmitting,, only stay getting final product of enough energy installations and auxiliary crank 1 and 17 attaching partss so the main crank 4 and 14 bodies of rod are long.On the rod end of main crank 4 and 14 and auxiliary crank 1,17 bodies of rod with main crank 4,14 same positions, be drilled with the hole vertical with the body of rod, be installed with little axle 20 in the hole respectively, point to the direction termination at axis 7 two ends at little axle 20, master rocker 3,16 and secondary- rocker 2,15 with little axle 20 vertical fixing are arranged respectively, master rocker 3 is connected as hinge with bearing pin with the end of secondary-rocker 2, and master rocker 16 is connected according to above-mentioned same mode with secondary-rocker 15; End at little 20 sensing cam, with master rocker 3 relative fixed inner slide 5 is arranged respectively, with secondary-rocker 2 relative fixed outer slide 6 is arranged, with master rocker 16 relative fixed inner slide 13 is arranged, with secondary-rocker 15 relative fixed outer slide 12 is arranged, in, outer slide 5,6 and 13,12 are pressed in the cam ring 9 of bottom bracket axle 8 one ends respectively, on the cam ring 18 of the external cam 10 and the other end and the slideway of external cam 19, when nearly sprocket wheel end inner slide 13 is pressed in the raised position of its cooresponding cam ring 18, the outer slide 6 of the other end is pressed on the raised position of its cooresponding external cam 10, at this moment, scrunched down commentaries on classics from sprocket wheel one side because of auxiliary crank 1, outer slide 6 is driven secondary-rocker 2 by external cam 10 jack-up and pushes away support master rocker 3, thereby promotion main crank 4 turns over the corner greater than auxiliary crank 1, the main crank 14 that drives opposite side changes same angle, ground, again by cam ring 18 jack-up inner slides 13, make the master rocker 16 pulling secondary-rockers 15 that are connected with it make auxiliary crank 17 upwards turn over zero-g arm point naturally perpendicular to ground location.

Claims (2)

1, a kind of crank load transfer device of pedal man car, comprise crank, axis that links to each other with crank (7) and bottom bracket axle (8), the power transmission chain, it is characterized in that: at bottom bracket axle (8) two ends, symmetrical respectively successively to both sides be installed with the raised points position of staggering mutually in, external cam (9), (10) and (18), (19), be fixed with main crank (4) and (14) that are 180 ° of angles mutually respectively on the axle journal of the axis (7) outside cam, the drive sprocket (11) that is fixed together with main crank (14) is arranged between cam that power transmission chain side is arranged (19) and main crank (14); The outside in two main cranks (4) and (14), auxiliary crank (1) is arranged respectively, (17) slide on the axle journal of axis (7) two ends, two couples of masters, on the body of rod of auxiliary crank (4) and (1) and (14) and (17), leave hole respectively perpendicular to the body of rod, be installed with little axle (20) in the hole respectively, point to axis (7) direction of both ends termination at little axle (20), be fixed with master rocker (3) perpendicular to little axle respectively, (16) and secondary-rocker (2), (15), main, the termination of secondary-rocker (3) and (2) and (16), (15) making hinge with bearing pin between the termination connects, point to an end of cam at little axle (20), inner slide (5) and master rocker (3) are arranged respectively, outer slide (6) and secondary-rocker (2), inner slide of the other end (13) and master rocker (16), outer slide (12) is fixed on respectively on the same little axle (20) in twos with secondary-rocker (15), in, outer slide (5), (6) and (13), (12) be pressed in each self-corresponding inside and outside cam (9) respectively, (10) and (18), (19) on the slideway, when the slide block (13) of nearly sprocket wheel (11) end raised position at cooresponding cam ring (18), the outer slide of homonymy (12) is in the recessed position of external cam, simultaneously from the outer slide (6) of sprocket wheel (11) end on the raised position of its cooresponding external cam (10), and the inner slide of homonymy (5) is at the following recessed position of cam ring (9).

2, the crank load transfer device of pedal man car as claimed in claim 1 is characterized in that: in interior outer slide (5), (6) and (13), (12) with the contacted position of corresponding cam separately roller (22) is installed.

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