CN2176967Y - Change curvature chain Wheel type speed changing device - Google Patents

Abstract

The utility model discloses a speed changing device which realizes speed changing by changing the matching angle of a drive shaft and a change curvature chain wheel, wherein, the change curvature chain wheel is composed of a chain disk frame and two chain disk blocks connected with each other on both ends of a same radial direction, the chain disk frame is coaxially matched with the external of a rotary sleeve through a ratchet structure, and the rotary sleeve can be connected with the drive shaft in a fastening way.

Description

Change curvature chain Wheel type speed changing device

The utility model relates to a kind ofly, can be widely used in the device of manually driven vehicle such as bicycle, three-wheel vehicle, disabled person's car or other simulated condition by changing the transmission system of the fit angle realization speed change between axle drive shaft and variable curvature sprocket wheel.

The variable curvature sprocket wheel, for example report maximum a kind of be ellipse wheel, its maximum part that is different from the typical circular sprocket wheel is exactly to have the diameter that is uneven in length in same sprocket wheel.Thereby, can obtain different driving speed ratios by different effective driving radiuses by changing the fit angle between axle drive shaft and variable curvature sprocket wheel, can realize speed change.For example drive crank with axle drive shaft by the minor axis position change that is positioned at the variable curvature sprocket wheel behind the major diameter position, under other condition unmodified situation, driving speed ratio will become minimum by maximum.On the other hand, change the ratio of the line of apsides of variable curvature sprocket wheel, also can change the speed ratio of driving.What Chinese patent 85201007U introduced is exactly a kind of transmission system that changes and regulate axle drive shaft and variable curvature sprocket wheel fit angle principle that utilizes.The change of its fit angle is to overlap the ratchet structure realization by being arranged at one between axle drive shaft and sprocket wheel, and also is provided with a cover friction subsystem and the manual clamping system of stopping of controlling shifted usefulness, so structure is comparatively complicated.Because needing also has inconvenient part with hand Attended Operation speed change in the use.On the other hand, the chain drum of monolithic devices is because the line of apsides immobilizes, and the limitation of field of application and object is also bigger, is difficult for making same set of transmission system to have extensive applicability and bigger speed range.

It is simpler that the purpose of this utility model provides a kind of structure, changes and the bigger variable curvature sprocket type transmission system of Applicable scope.

Through the ratchet structure coaxial cooperation variable curvature sprocket wheel is arranged equally outside the rotary sleeve that can keep rotating synchronously with axle drive shaft with fastening connection of axle drive shaft in the utility model transmission system.This sprocket wheel is not to be monolithic devices, forms but be coupled to each other with the two chain drum pieces that are arranged at its same radial line direction two ends by the chain plate rail.Chain plate rail and rotary sleeve are through said ratchet structure coaxial cooperation.The two chain drum pieces that are connected in chain plate rail two ends have the sprocket that can be meshed with chain drive-belt in the far-end outer rim at least.In this version, in fact the driving track that is become by the common encirclement of the periphery line of two chain drum pieces is exactly the variable curvature sprocket wheel of an equivalence.And this knockdown non-integral type variable curvature sprocket wheel also is to have variability and broad applicability flexibly except that making things convenient for processing and manufacturing and assembling.Be example to use on bicycle, when two chain drum pieces were fixedly linked on the chain plate rail, this sprocket wheel was the variable curvature sprocket wheel of the ratio of fixed length minor axis; And when one or two chain drum piece is connected on the chain plate rail with bolt or other suitable connector in the mode that can change or regulate its radial spacing, then by changing the ratio that its radial spacing changes the variable curvature sprocket wheel line of apsides, both can further enlarge speed range, the different needs that also can adapt to different automobile types or use object, make a cover transmission system have commonality widely, even can also form the different recreational effect that eccentric variable curvature sprocket wheel produces by the coupled position of regulating the chain drum piece and be used for different amusement game vehicles.

Be that example illustrates structure of the present utility model below, but scope of the present utility model is not to wait to be limited to following example with bicycle transmission shown in the drawings.

The form of Fig. 1 a kind of transmission system of the present utility model

The plan structure of Fig. 2 device shown in Figure 1

The form of Fig. 3 another kind of transmission system of the present utility model

The A-A view of Fig. 4 Fig. 3

Example 1

As depicted in figs. 1 and 2.Variable curvature sprocket wheel 4 in this routine device is made of chain plate rail 2 and the two chain drum pieces 5 that are connected in its same radial line direction two ends, and the far-end outer rim of chain drum piece 5 all has the sprocket that can be meshed with chain drive-belt.The middle part of chain plate rail 2 through ratchet structure 3 coaxial cooperation of freewheel pattern in can with the fastening rotary sleeve that connects 1 of axle drive shaft outside, the two can only do unidirectional relatively rotating to make this.Connect at chain plate rail 2 and be provided with in the radial position of chain drum pieces 5 that some chain drum piece 5 usefulness bolts 6 are connected on the suitable connection holes position to having the connection holes of different radial spacings, the ratio of the line of apsides of variable curvature sprocket wheel 4 can be adjusted in change position, hole.Be the unlikely engagement that influences sprocket wheel and chain drive-belt, this adjustment of taking turns the footpath changes to be advisable by the integral multiple of chain link plate length.Be provided with the chocking construction that suitable elastic-friction sheet or ring etc. can strengthen its relative motion friction force form between the cooperation contact surface in ratchet structure 3, or employing is unlikely arbitrarily shifted when guaranteeing rotary sleeve 1 with 13 reversings of driving crank as the chocking construction of reverse ratchet structure 14 forms in the example 2.The also coaxial fastening driven gear that can rotate synchronously 9 that is connected with of chain plate rail 2 is engaged with and the stopping gear 8 that has a screw rod 11 of coaxial synchronous rotation is connected on the vehicle frame with bearing support 7, on the screw rod 11 spiral be combined with one can be along the backing block 10 of screw translation.When driving crank 13 and drive driven gears 9 reversings, drive screw rods 11 through stopping gear 8 and rotate, backing block 10 promptly along screw rod 11 to right translation.Propping up bearing support 7 to backing block 10 can't continue when mobile, promptly having pinned screw rod 11 also no longer is rotated further, and pinned chain plate rail 2 no longer with crank 13 reversings through stopping gear 8 and driven gear 9, so crank 13 drives the rotary sleeve 1 that connects with axle drive shaft and relatively rotates with chain plate rail 2 on the hand of rotation that ratchet structure 3 allows, change the two fit angle, finish the gear shift speed regulation process.Whole process need not to use the hand Attended Operation.In case crank 13 continues to be rotated in the forward, through same transmission approach screw rod 11 backward rotation, backing block 10 promptly leaves above-mentioned locked position, and the holding fix place that moves to the no screw thread of screw rod 11 the other end and be provided with pull back spring 18 stops.Chain plate rail 2 promptly advances with adjusted speed ratio powered vehicle with the rotation of crank 13 synchronous forward at this moment.

Example 2

As shown in Figure 3 and Figure 4.Identical with last example, 1 of the chain plate rail 2 in this example and rotary sleeve also cooperate through the ratchet structure 3 coaxial sockets of freewheel form.The two gear type chain drum pieces 5 that have sprocket all are socketed on respectively in the bearing hole at chain plate rail 2 same radial line direction two ends through the rotating shaft 16 of the fastening connection in center.Connect with rotary sleeve 1 and the driving crank 13 that rotates synchronously links with low-speed drive gear 12 with the coaxial setting of axle drive shaft through axle drive shaft.Two driven gears 15 that are meshed of driven wheel 12 are coupled in the same rotating shaft 16 with two gear type chain drum pieces 5 respectively therewith.In addition, chain plate rail 2 also is provided with a cover ratchet structure 14 opposite with ratchet structure 3 spacing directions with 17 on vehicle frame axle sleeve.When crank 13 was rotated in the forward, ratchet structure 3 kept cranks 13 to be in relative static fixed position with chain plate rail 2, and two gear type chain drum pieces 5 can't rotation, can only advance with monolithic devices variable curvature sprocket form powered vehicle with 2 rotations of chain plate rail.When crank 13 reversings, oppositely directed ratchet structure 14 can't reverse and static chain plate rail 2, and crank 13 but can and drive low-speed drive gear 12 with rotary sleeve 1 and reverse synchronously, and crank 13 promptly changes with the fit angle of chain plate rail 2 thereupon, realizes speed change.Meanwhile, the low-speed drive gear 12 of reversing synchronously drives two driven gears 15 that are engaged with and is rotated in the forward, and the two gear type chain drum pieces 5 coaxial with it also are rotated in the forward thereupon, can continue to drive chain drive-belt and rotate, powered vehicle is advanced, and it is lower only to drive speed ratio.Even the advantage of this kind structure is crank when reversing, no matter whether need shiftedly, can not make vehicle lose propulsive effort, it is special or in emergency circumstances guarantee traveling security at some to help.And the mode of reversing driven at low speed yet more is applicable to goes up a slope or use under the bigger heavy burden situation is arranged.

Claims (4)

1, a kind of by changing and adjust the transmission system of fit angle realization speed change between axle drive shaft and variable curvature sprocket wheel, have one and can and can make counterrotating variable curvature sprocket wheel (4) with the fastening rotary sleeve that connects of axle drive shaft (1) and setting coaxial with it with it, make unidirectional counterrotating ratchet structure (3) and cooperatively interact to limit it therebetween, it is characterized in that said variable curvature sprocket wheel (4) is made of chain plate rail (2) and the two chain drum pieces (5) that are connected in its same radial line direction two ends, chain plate rail (2) is through ratchet structure (3) and rotary sleeve (1) coaxial cooperation, and chain drum piece (5) has the sprocket that can be meshed with chain drive-belt in the far-end outer rim at least.

2, transmission system as claimed in claim 1 is characterized in that said two chain drum pieces (5) are connected on the chain plate rail (2) in the mode of its radial spacing of scalable.

3, transmission system as claimed in claim 1 or 2, it is characterized in that being provided with between the fitting surface in the said ratchet structure (3) and stop its chocking construction in relative rotation, also coaxial fastening connection one driven gear of chain plate rail (2) (9), the screw rod (11) of stopping gear that can be engaged with (8) and coaxial fastening connection is connected on the pedestal by supporting structure, and screw rod (11) is gone up with the spiral fit system and is provided with the backing block (10) that can move along screw rod (11) axially parallel.

4, transmission system as claimed in claim 1, it is characterized in that said two chain drum pieces (5) are the gear forms that has the complete cycle sprocket, respectively through being connected on the chain plate rail (2) with its fastening S. A. that connects (16), S. A. (16) and the coaxial driven gear (15) that has, said rotary sleeve (1) have one can with its rotation synchronously and the driven wheel (12) that can be meshed with driven gear (15), between chain plate rail (2) and pedestal axle sleeve (17) and be provided with a reverse ratchet structure (14) opposite with the spacing direction of ratchet structure (3).

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