CN1601144A - Back action mechanism of belt type stepless gear - Google Patents

Back action mechanism of belt type stepless gear Download PDF

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Publication number
CN1601144A
CN1601144A CN 03157597 CN03157597A CN1601144A CN 1601144 A CN1601144 A CN 1601144A CN 03157597 CN03157597 CN 03157597 CN 03157597 A CN03157597 A CN 03157597A CN 1601144 A CN1601144 A CN 1601144A
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China
Prior art keywords
wheel
cam
semi
belt
guide rail
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CN 03157597
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CN100351545C (en
Inventor
古焕隆
吕俊贤
魏增德
吴建宗
黄贤雄
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Industrial Technology Research Institute ITRI
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Industrial Technology Research Institute ITRI
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Priority to CNB031575978A priority Critical patent/CN100351545C/en
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Publication of CN100351545C publication Critical patent/CN100351545C/en
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Abstract

The invention relates to a kind of back action mechanism of draper-type non segment speed changer. The invention is used to transfer dynamic force of positive-reverse direction, reach the different speed reducing ratio, and suit automotive vehicle drive components of different power equipment. It includes front draper wheel, source of power, back draper wheel, and twisting force cam set fitted over the front draper wheel and after draper wheel with ring. The front draper wheel and the source of the power is set on the front rotating shaft; the front draper wheel is made up of front active semi-wheel set on the front rotating shaft by slip cap and front fixed semi-wheel fixedly set on the front rotating shaft; the after draper wheel is made up of the back fixed semi-wheel and back active semi-wheel which are fitted over the back-shaft.; the twisting force cam set includes cam guide slot set on the active semi-wheel and corresponding cam pin in the cam guide slot; the clockwise rotation cam guide rail and the anticlockwise rotation cam guide rail are set on the inner wall of the cam guide slot; one end of the cam pin is set in the fixed semi-wheel, the other end is set in the cam guide slot and contacted to the opposite rotation cam guide rail and the reverse rotation cam guide rail.

Description

The reverse gear mechanism of belt stepless transmission
Technical field
The invention belongs to the motor vehicle transmission parts, particularly a kind of reverse gear mechanism of belt stepless transmission.
Background technique
That the belt continuous variable transmission has is with low cost, simple in structure, maintenance easily, advantage such as slewing range is wide, therefore more and more be widely used on the various power transmission machines.
Common belt continuous variable transmission has two kinds:
1, for to connect two groups of belt pulleys with a V-arrangement balata belt circle, i.e. drive pulley and negative pulley wheel, its mechanism only applies local butter in belt pulley inside lubricated, and entire mechanism is to belong to dry type, does not use oil lubricating, can transmit less power.
2,, form a whole piece composite material metal chain zone circle for to be combined on the steel band with many V-arrangement sheet metals and composite material.This composite material and metal chain zone circle connect two groups of chain belt wheels, i.e. driving pulley and passive belt wheel, and its mechanism can be dry type, also its whole group can be placed in the sump, and enough lubricated to obtain, it is lubricated to belong to wet type; Be usually used in the transmission of big power.
Two groups of belt wheels of these belt gears distinctly all are two and half to take turns and combine, one is individual for being fixed in the fixed semi-wheel in the rotating shaft, another for can in the rotating shaft movable adjust two and half take turns between the active semi-wheel of width, so as to changing effective contact position and effective turning radius of zone circle and belt wheel, make the rotating ratio between two belt wheels change, and then reach the effect of continuous variable speed.
The mode of the active semi-wheel adjustment position of two belt wheels has many kinds, and useful centrifugal is subjected to rotation speed change generation centrifugal force to push and adjust the position, useful oil pressure control and the adjustment position of adding, and the useful electromagnetic force that adds promotes and the adjustment position.
The belt gear that all are known all can only transmit the power of single direction, can not transmit reciprocal power.When backward rotation, torsion can completely lose, and can't tighten with transferring power between zone circle and the belt wheel.Because the disappearance on this function makes known belt gear not use widely on more many-sided power-transmitting unit.
Known belt gear can only transmit the rotating power of a direction and the reason that can not transmit reciprocal rotating power is because on two belt wheels or one of them belt wheel, the mechanism that one group of above twisting force cam is arranged, this kind twisting force cam comprises cam pin and cam rail, designs respectively on the fixed semi-wheel and active semi-wheel of each belt wheel.When the torsion of a certain direction was transmitted in the belt wheel rotation, the inner side surface that cam pin can push against cam rail was on the cam tracks, and when cam pin propped up cam rail, its active force can be perpendicular to the point of contact of cam tracks.This active force can be decomposed into two branch force vectors, and branch force vector is perpendicular to the running shaft of belt wheel, another minute force vector be parallel to the running shaft of belt wheel.If the branch force vector that is parallel to the belt wheel running shaft is towards the zone circle direction, active semi-wheel will be tried hard to recommend toward the zone circle direction by the effect of cam pin and move, and the friction between zone circle and the belt wheel will increase, and belt wheel can be by the zone circle transferring power.Otherwise if this branch force vector that is parallel to the belt wheel running shaft is away from the zone circle direction, then active semi-wheel will be pushed away zone circle by the active force of cam pin, and the friction between zone circle and the belt wheel will weaken and skid, can't sustained delivery power.
Two inner side surfaces of known cam rail are parallel, and when just changeing, the component of the active force that cam pin produced on the belt wheel running shaft is towards the zone circle direction, make a cam tracks can bring into play the effect of transferring power.But when counter-rotating, another cam tracks acts on mutually with cam pin, and the component of its active force on the belt wheel running shaft is zone circle direction dorsad, so make active semi-wheel away from zone circle, causes and skids, the transferring power of having no idea.
In addition in the industry use and the traffic tool, the application demand of just changeing and reversing two kinds of power outputs is often arranged, as all exportable power sources that is just changeing and reversing of power equipment such as motor, air compressor or hydraulic presses, promptly use piston engines such as internal-combustion engine or external-combustion engine to be power, also can the power source of unidirectional output be varied to the two-way outputting power source that can just change and reverse via easy reverse gear mechanism.Though having produced very easily, just changeing and the two-way output of reversing power source, but stepless transmission as torsion conversion and transmission, but have only single turning to always, therefore whole power system can't be used low cost and speed change belt continuous variable transmission smoothly, can only use expensive speed-changing gear box.
Summary of the invention
The purpose of this invention is to provide and a kind ofly can transmit forward and reverse power, reach different reduction speed ratio, be applicable to the reverse gear mechanism of the belt stepless transmission of different dynamic equipment.
The present invention includes preceding belt wheel, power source, back belt wheel, be sheathed on zone circle and twisting force cam group on preceding belt wheel and the back belt wheel; Preceding belt wheel and power source are mounted on the front rotary shaft; Before belt wheel be located at the preceding active semi-wheel on the front rotary shaft by flip sleeve and the preceding fixed semi-wheel that is fixedly arranged on the front rotary shaft is formed; Back belt wheel is made up of the back fixed semi-wheel and the back active semi-wheel that are sheathed on the rear axle; The twisting force cam group comprises cam rail and the correspondence of being located on the active semi-wheel and is placed in the interior cam pin of cam rail; The cam rail inner circle wall is provided with positive cam-rotating guide rail and inverse cam guide rail; Cam pin one end is located on the fixed semi-wheel, and its other end places cam rail and contacts with positive cam-rotating guide rail or inverse cam guide rail.
Wherein:
Before active semi-wheel be provided with centrifugal and have camming surface and centrifugal change of corresponding rotating speed control before belt wheel contact centrifugal backboard of turning radius with zone circle.
The twisting force cam group is arranged on the belt wheel of back; Back fixed semi-wheel sets firmly the back fixed semi-wheel axle sleeve that is connected with the back rotating shaft; Back active semi-wheel sets firmly to endwisely slip and is sheathed on back active semi-wheel axle sleeve on the fixed semi-wheel axle sleeve of back; The cam rail of twisting force cam group is located on the active semi-wheel axle sleeve of back, and an end of cam pin is located on the fixed semi-wheel axle sleeve of back.
Back rotating shaft one end is provided with spring retainer, and overlaps if the back active semi-wheel has the elastic component of fixed semi-wheel mobile trend backwards on the back active semi-wheel axle sleeve between spring retainer and the back active semi-wheel.
Cam rail is L-shaped, and the positive cam-rotating guide rail of its inner circle wall and inverse cam guide rail have variously to be done in order to form the different curvature radius that different twisting force cam reach different rate of change gear ratio mutually with cam pin.
Power source is motor or motor.
Zone circle is vee-belt or composite material metallic link belt.
The twisting force cam group for several symmetrical distributions be provided with the back belt wheel back fixed semi-wheel back fixed semi-wheel axle sleeve and the back active semi-wheel back active semi-wheel axle sleeve on.
The twisting force cam group can be located on the preceding belt wheel.
Cam pin one end is arranged on the fixed semi-wheel axle sleeve of back versatilely, and it is provided with pulley so as to the minimizing sliding friction with the positive cam-rotating guide rail of being located at the cam rail inner circle wall or a end that the inverse cam guide rail contacts; Be arranged with the plastic cement outer cover that cam pin can be fixed in the cam rail on the twisting force cam group.
Owing to the present invention includes preceding belt wheel, power source, back belt wheel, be sheathed on zone circle and twisting force cam group on preceding belt wheel and the back belt wheel; Preceding belt wheel and power source are mounted on the front rotary shaft; Before belt wheel be located at the preceding active semi-wheel on the front rotary shaft by flip sleeve and the preceding fixed semi-wheel that is fixedly arranged on the front rotary shaft is formed; Back belt wheel is made up of the back fixed semi-wheel and the back active semi-wheel that are sheathed on the rear axle; The twisting force cam group comprises cam rail and the correspondence of being located on the active semi-wheel and is placed in the interior cam pin of cam rail; The cam rail inner circle wall is provided with positive cam-rotating guide rail and inverse cam guide rail; Cam pin one end is located on the fixed semi-wheel, and its other end places cam rail and contacts with positive cam-rotating guide rail or inverse cam guide rail.Little when the power source outputting power, when front rotary shaft slowly runs, the preceding active semi-wheel in the preceding belt wheel and the distance of preceding fixed semi-wheel zoom out, the turning radius of belt wheel and the zone circle end that combines with it is dwindled before making; And the turning radius that zone circle is located at back belt wheel end increases, and makes cam pin withstand the latter end of positive cam-rotating guide rail in the cam rail; Can drive back rotating shaft outputting power.When middling speed, rotating speed increases, and belt wheel reaches the zone circle end turning radius increase that combines with it before making; Zone circle is located at back belt wheel end turning radius and is dwindled, and cam pin walks to positive cam-rotating guide rail stage casing.When high speed, the front rotary shaft rotating speed increases, and makes preceding belt wheel reach the zone circle end turning radius that combines with it and increases, and zone circle is located at back belt wheel end turning radius and is dwindled, and the frictional force that the extruding force that relies on the twisting force cam group to be produced is brought is come transferring power.When reversing, power source output reverse power makes the front rotary shaft counter-rotating, drives the zone circle counter-rotating, back active semi-wheel counter-rotating this moment, and the cam pin card makes the back reverse rotation of rotary shaft to the inverse cam guide rail, the power of output reversing.Be the cam rail that the present invention utilizes the tool reverse functions, make the belt continuous variable transmission can export the power of forward and reverse, and do not need to increase again reverse gear mechanism, can effectively reduce the complexity and the cost of whole mechanism; And can change the shape of cam rail according to employed power mechanism, and obtaining different gear ratio, can being widely used on various types of industrial and vehicles, and unique special effect.Can not only transmit forward and reverse power, and reach different reduction speed ratio, be applicable to different dynamic equipment, thereby reach purpose of the present invention.
Description of drawings
Fig. 1, for structural representation sectional view of the present invention.
Fig. 2, be A-A sectional view among Fig. 1.
Fig. 3, for structural representation sectional view of the present invention (lower-speed state).
Fig. 4, for structural representation sectional view of the present invention (middling speed state).
Fig. 5, for structural representation sectional view of the present invention (fast state).
Fig. 6, for structural representation sectional view of the present invention (reversing state).
Fig. 7, for twisting force cam principle of dynamics schematic representation of the present invention (just changeing state).
Fig. 8, for twisting force cam principle of dynamics schematic representation of the present invention (inverted status).
Fig. 9, be B portion partial enlarged drawing among Fig. 1 (inverse cam guide rail constitute variable gear ratio).
Figure 10, be B portion partial enlarged drawing (radius of curvature of inverse cam guide rail is limited negative value) among Fig. 1.
Figure 11, be B portion partial enlarged drawing among Fig. 1 (effective radius of curvature of positive cam-rotating guide rail on the occasion of infinity).
Figure 12, be B portion partial enlarged drawing among Fig. 1 (radius of curvature of positive cam-rotating guide rail be limited on the occasion of).
Figure 13, for input speed of the present invention and output speed curve synoptic diagram.
Embodiment
As shown in Figure 1, the present invention includes preceding belt wheel 1, power source 10, back belt wheel 2, zone circle 3 and twisting force cam group 4.
Preceding belt wheel 1 and power source 10 are mounted on the front rotary shaft 11.
The motor or the motor of the power of power source 10 exportable forward and reverse.
Back belt wheel 2 is mounted in the rotating shaft 21 of back.
Zone circle 3 is vee-belt or composite material metallic link belt, and it is sheathed on preceding belt wheel 1 and the back belt wheel 2.
Twisting force cam group 4 is located on the belt wheel 2 of back.By said elements, make the exportable power that is just changeing and reversing of belt stepless transmission.
As shown in Figure 1 and Figure 2, the preceding belt wheel 1 that is mounted on the front rotary shaft 11 is made up of preceding active semi-wheel 12 and preceding fixed semi-wheel 13.Preceding active semi-wheel 12 flip sleeves are located on the front rotary shaft 11, can move axially on front rotary shaft 11.Preceding fixed semi-wheel 13 is fixedly arranged on the front rotary shaft 11, and together rotates with front rotary shaft 11.
Be mounted on the power of the power source 10 exportable forward and reverse on the front rotary shaft 11, make preceding runner 1 forward or reverse according to need.
The back belt wheel 2 that is mounted in the rotating shaft 21 of back is made up of back fixed semi-wheel 22 and back active semi-wheel 23.
Back fixed semi-wheel 22 sets firmly the back fixed semi-wheel axle sleeve 24 that is connected with back rotating shaft 21, together rotates so as to making back fixed semi-wheel 22 can drive back rotating shaft 21, with outputting power.
Back active semi-wheel 23 sets firmly to endwisely slip and is sheathed on back active semi-wheel axle sleeve 25 on the back fixed semi-wheel axle sleeve 24.
Zone circle 3 is sheathed on preceding belt wheel 1 and the back belt wheel 2, in order to transfer motion power.
Twisting force cam group 4 comprises several cam rails 41 of being symmetrically distributed in back active semi-wheel axle sleeve 25 perisporiums and corresponding and be placed in cam pin 42 in the cam rail 41.
Cam rail 41 is L-shaped, and it forms in back active semi-wheel axle sleeve 25 perisporiums for hollow out, and cam rail 41 inner circle walls are provided with positive cam-rotating guide rail 43 and inverse cam guide rail 44.
Cam pin 42 1 ends are arranged on the back fixed semi-wheel axle sleeve 24 versatilely, and its other end contacts with positive cam-rotating guide rail 43 or the inverse cam guide rail 44 of being located at cam rail 41 inner circle walls.Cam pin 42 is provided with so as to reducing the pulley of sliding friction with the end that positive cam-rotating guide rail 43 or inverse cam guide rail 44 contact.
Be provided with centrifugal 14 and centrifugal backboard 15 in the preceding active semi-wheel 12.
Centrifugal backboard 15 is provided with camming surface 151.When preceding active semi-wheel 12 is rotated, centrifugal 14 can produce centrifugal force, and the camming surface 151 on centrifugal backboard 15 moves active semi-wheel 12 before pushing, active semi-wheel 12 change axial positions before forcing.
Back rotating shaft 21 1 ends are provided with spring retainer 26, and in spring retainer 26 and back sheathed elastic component 27 on the back active semi-wheel axle sleeve 25 between the active semi-wheel 23, make back active semi-wheel 23 have the trend that fixed semi-wheel 22 backwards moves.
In addition, the relative respectively inclined-plane that constitutes for engage V-shaped groove with zone circle 3 that is provided with between preceding active semi-wheel 12 and preceding fixed semi-wheel 13 and back fixed semi-wheel 22 and the back active semi-wheel 23.
Be arranged with the plastic cement outer cover that cam pin 42 can be fixed in the cam rail 41 on the twisting force cam group 4, come off so as to preventing cam pin 42.
As shown in Figure 3, little when power source 10 outputting powers, when front rotary shaft 11 slowly runs, before preceding active semi-wheel 12 in the belt wheel 1 be not subjected to centrifugal 14 effect and zoom out with the distance of preceding fixed semi-wheel 13, V-shaped groove that active semi-wheel 12 and preceding fixed semi-wheel 13 constitute before making and the turning radius that is incorporated into zone circle 3 one ends in it are dwindled; And zone circle 3 is located at the back active semi-wheel 23 of back belt wheel 2 and the other end turning radius increase of the V-shaped groove of back fixed semi-wheel 22 formations, and incite somebody to action back active semi-wheel 23 by returning spring 27 and push up fixed semi-wheel 22 backward, make cam pin 42 withstand the latter end of positive cam-rotating guide rail 43 in the cam rail 41.
When back active semi-wheel 23 is rotated with back fixed semi-wheel 22, since back fixed semi-wheel 22 be subjected to the load effect of back rotating shaft 21 produce sluggish and and produce the difference of relative angle between the active semi-wheel 23 of back, make cam pin 42 can hold out against positive cam-rotating guide rail 43 more, therefore will back active semi-wheel 23 backward the direction of fixed semi-wheel 22 push, make zone circle 3 be clamped by back active semi-wheel 23 and back fixed semi-wheel 22, zone circle 3 increases with the frictional force of back belt wheel 2, therefore can drive back rotating shaft 21 outputting powers.
As shown in Figure 4, when middling speed, rotating speed increases, centrifugal 14 preceding active semi-wheel 12 forward fixed semi-wheel 13 push away closely, make the increase of zone circle 3 turning radius; Zone circle 3 is located at the other end turning radius of back belt wheel 2 and is dwindled, and back active semi-wheel 23 is resisted the strength of returning springs 27 and outwards moved, and cam pin 42 walks to positive cam-rotating guide rail 43 stage casings, keeps balances until returning spring 27.
As shown in Figure 5, when high speed, front rotary shaft 11 rotating speeds increase, be subjected to for centrifugal 14 huge centrifugal action with preceding active semi-wheel 12 more forward fixed semi-wheel 13 push close, zone circle 3 is pushed to the top increases turning radius again, zone circle 3 is located at the other end turning radius of back belt wheel 2 and is dwindled, makes back active semi-wheel 23 push returning spring 27 and outwards moves, and the frictional force that the extruding force that the transmission of power still relies on twisting force cam group 4 to be produced is brought is come transferring power.
As shown in Figure 6, when reversing, power source 10 output reverse power make front rotary shaft 11 counter-rotatings, drive zone circle 3 counter-rotatings, back active semi-wheel 23 counter-rotatings this moment, and cam pin 42 blocks to inverse cam guide rail 44, makes back rotating shaft 21 reversings, the power of output reversing.
As shown in Figure 7, when just changeing, cam pin 42 is at the vertical positive cam-rotating guide rail 43 of the active force pq of point of contact 1p generation, and this active force pq can be divided into perpendicular to the po vector of back rotating shaft 21 and the oq vector of rotating shaft 21 after being parallel to.The oq vector is pushed back active semi-wheel 23 and is moved axially toward zone circle 3 directions, makes to produce great friction between back belt wheel 2 and the zone circle 3, is enough to transmit great rotating power.The po vector then can make cam pin 42 push against positive cam-rotating guide rail 43, makes back active semi-wheel 23 and back fixed semi-wheel 22 fuse rotation together.
As shown in Figure 8, when reversing, inverse cam guide rail 44 will offset with cam pin 42, cam pin 42 is stuck in the inverse cam guide rail 44 can not be moved, active force ij on its point of contact 1i is perpendicular to back rotating shaft 21, make the fixed-site of back active semi-wheel 23 not move, keep certain gear ratio.
As Fig. 9, Figure 10, Figure 11, shown in Figure 12, the present invention is for being applicable to various power mechanisms, and the positive cam-rotating guide rail 43 of cam rail 41 can have different Design of Curvature Radius with inverse cam guide rail 44, changes speed to reach different gear ratio.
As shown in Figure 9, the inverse cam guide rail 44a that contacts with cam pin 42a is concave arc surface and variable gear ratio is arranged, and gear ratio can be changed with load.
As shown in figure 10, the inverse cam guide rail 44b that contacts with cam pin 42b is the convex globoidal that radius of curvature is limited negative value, and along with torsion changes, its reduction speed ratio rate of change is first quick and back slow.
As shown in figure 11, the positive cam-rotating guide rail 43c that contacts with cam pin 42c is effective radius of curvature on the occasion of infinitely-great straight line, and reduction speed ratio can keep even variation when just changeing; Contact inverse cam guide rail 44c with cam pin 42c and be radius of curvature on the occasion of infinitely-great straight line, reduction speed ratio also keeps even variation during reversing.
As shown in figure 12, the positive cam-rotating guide rail 43d that contacts with cam pin 42d be radius of curvature be limited on the occasion of convex globoidal, it is that slow earlier back is fast that reduction speed ratio changes; Be provided with groove among the inverse cam guide rail 44d that contacts with cam pin 42d, groove can block cam pin 42d when reversing, makes reduction speed ratio become fixed value not change.
As shown in figure 13, the input speed that the present invention obtained and the change curve of output speed are no matter forward or reverse all can obtain maximum torsion than (maximum reduction speed ratio) when low speed; When rotating speed is higher than a certain particular value, also can obtain maximum speed increasing ratio; And between the reduction speed ratio and maximum speed increasing ratio of maximum, can become the suitable speed change of continuous cunning, make the present invention to be applied on the various power mechanisms with the belt type continuous variable speed system of least cost.
In sum, the present invention utilizes the cam rail 41 of tool reverse functions, makes the belt continuous variable transmission can export the power of forward and reverse, and does not need to increase reverse gear mechanism again, can effectively reduce the complexity and the cost of whole mechanism; And can change the shape of cam rail 41 according to employed power mechanism, to obtain different gear ratio.So the present invention can be widely used on various types of industrial and vehicles, and unique special effect.

Claims (10)

1, a kind of reverse gear mechanism of belt stepless transmission, it comprise preceding belt wheel, power source, back belt wheel and be sheathed on before zone circle on belt wheel and the back belt wheel; Preceding belt wheel and power source are mounted on the front rotary shaft; Before belt wheel be located at the preceding active semi-wheel on the front rotary shaft by flip sleeve and the preceding fixed semi-wheel that is fixedly arranged on the front rotary shaft is formed; Back belt wheel is made up of the back fixed semi-wheel and the back active semi-wheel that are sheathed on the rear axle; It is characterized in that described belt wheel is provided with the twisting force cam group; The twisting force cam group comprises cam rail and the correspondence of being located on the active semi-wheel and is placed in the interior cam pin of cam rail; The cam rail inner circle wall is provided with positive cam-rotating guide rail and inverse cam guide rail; Cam pin one end is located on the fixed semi-wheel, and its other end places cam rail and contacts with positive cam-rotating guide rail or inverse cam guide rail.
2, according to the reverse gear mechanism of the belt stepless transmission of stating of claim 1, it is characterized in that described before active semi-wheel be provided with centrifugal and have camming surface and centrifugal change of corresponding rotating speed control before belt wheel contact centrifugal backboard of turning radius with zone circle.
3,, it is characterized in that described twisting force cam group is arranged on the belt wheel of back according to the reverse gear mechanism of the belt stepless transmission of stating of claim 1; Back fixed semi-wheel sets firmly the back fixed semi-wheel axle sleeve that is connected with the back rotating shaft; Back active semi-wheel sets firmly to endwisely slip and is sheathed on back active semi-wheel axle sleeve on the fixed semi-wheel axle sleeve of back; The cam rail of twisting force cam group is located on the active semi-wheel axle sleeve of back, and an end of cam pin is located on the fixed semi-wheel axle sleeve of back.
4, according to the reverse gear mechanism of the belt stepless transmission of stating of claim 1, it is characterized in that described back rotating shaft one end is provided with spring retainer, and on the back active semi-wheel axle sleeve between spring retainer and the back active semi-wheel, overlap if the back active semi-wheel has the elastic component of fixed semi-wheel mobile trend backwards.
5, according to the reverse gear mechanism of the belt stepless transmission of stating of claim 1, it is characterized in that described cam rail is L-shaped, the positive cam-rotating guide rail of its inner circle wall and inverse cam guide rail have variously to be done in order to form the different curvature radius that different twisting force cam reach different rate of change gear ratio mutually with cam pin.
6, according to the reverse gear mechanism of the belt stepless transmission of stating of claim 1, it is characterized in that described power source is motor or motor.
7, according to the reverse gear mechanism of the belt stepless transmission of stating of claim 1, it is characterized in that described zone circle is vee-belt or composite material metallic link belt.
8,, it is characterized in that described twisting force cam group is provided with for several symmetrical distributions on the back active semi-wheel axle sleeve of the back fixed semi-wheel axle sleeve of back fixed semi-wheel of back belt wheel and back active semi-wheel according to the reverse gear mechanism of the belt stepless transmission of stating of claim 1 or 3.
9, according to the reverse gear mechanism of the belt stepless transmission of stating of claim 1, it is characterized in that described twisting force cam group can be located at before on the belt wheel.
10, according to the reverse gear mechanism of the belt stepless transmission of stating of claim 1 or 3, it is characterized in that described cam pin one end is arranged on the fixed semi-wheel axle sleeve of back versatilely, it is provided with pulley so as to the minimizing sliding friction with the positive cam-rotating guide rail of being located at the cam rail inner circle wall or a end that the inverse cam guide rail contacts; Be arranged with the plastic cement outer cover that cam pin can be fixed in the cam rail on the twisting force cam group.
CNB031575978A 2003-09-24 2003-09-24 Back action mechanism of belt type stepless gear Expired - Lifetime CN100351545C (en)

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CN100351545C CN100351545C (en) 2007-11-28

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