CN101769366A - Stepless transmission - Google Patents

Abstract

The present invention relates to a stepless transmission comprising a first planetary gear set comprising a first working part, a second working part and a third working parts, a second planetary gear set comprising a fourth working part, a fifth working part and a sixth working part, wherein the first and fifth working parts are connected with an input shaft for receiving driving power, the third and sixth working parts are fixedly connected through a gear on worm, the second working part is connected with a variable shaft for receiving speed changing power for changing speed, and the fourth working part is connected with an output shaft. In the stepless transmission, the moment of torque for rotating the worm of the gear to the rotation direction of a worm wheel is equal to the difference between a moment of torque acted on the worm by the worm wheel of the gear on worm and a moment of torque generated because of the friction force between the worm wheel and the worm, the difference of the two moments of torque is much smaller than the moment of torque exerted to the output shaft, therefore a motor with a small output can be used as the speed changing power for driving the variable shaft of the worm wheel of the gear on worm to change a big output speed.

Description

Stepless speed variator

Technical field:

The present invention relates to a kind ofly connect two planetary gear set by worm screw (worm) gear, and the electric stepless speed variator of controlling with motor.

Background technique:

Generally, automatic transmission roughly is divided into step change transmission and stepless speed variator.

Step change transmission is with a long history, and is commonly used.But in order to improve fuel efficiency and the transmission of power performance need carries out multipolarity, however multipolarity, and structure is complicated more, and manufacture cost increases.

On the contrary, stepless speed variator has certain narrow limitation in the higher moment of torsion transmission that utilizes friction.And the structure that has overcome moment of torsion transmission limitation still exists parts to lack the problem of durability and high oil pressure.

Usually, the speed of the power that Direct Transform output is big is very difficult, therefore such if any the level speed changer, on the gear train of different gear ratio, connect power and change power speed, perhaps as stepless speed variator, connect the input shaft of power and the diameter of output shaft by change, thereby adjust gear ratio continuously, change the speed of power with this.

Fig. 1 is the schematic representation of the stepless speed variator of the routine that is made of a planet gear train.

As shown in Figure 1, the stepless speed variator that is made of a planet gear train comprises sun gear S, gear ring R, the planet carrier C as the planetary gear set PG of its workpiece.Described gear ring R is connected with input shaft 10 and receives driving power, and described planet carrier C is connected with variable-speed shaft 20 and receives the variable-speed dynamic that is used for speed change, and described sun gear S is connected and the power of cvt output device with output shaft 30.

With regard to described stepless speed variator, the speed of output shaft 30 (that is the speed of sun gear S) changes along with the speed (that is the speed of planet carrier C) of variable-speed shaft 20.Below, the situation when illustrating the constant airspeed of input shaft 10.

Under the situation of the constant airspeed of input shaft 10, if the speed of variable-speed shaft 20 reduces according to the determined predetermined speed of the gear ratio of described planetary gear set PG for the speed that makes output shaft 30 becomes zero gradually from it, the speed of then described output shaft 30 will be started from scratch increase (at this, do not consider sense of rotation, only the absolute value to rotational speed compares).The speed of the speed of described variable-speed shaft 20 and output shaft 30 has man-to-man corresponding relation according to the gear ratio of described planetary gear set PG, and the speed of output shaft 30 determines according to the speed of described variable-speed shaft 20.That is, as shown in Figure 2, if the speed of variable-speed shaft 20 begins to reduce from predetermined speed, the then speed of output shaft 30 increase of will starting from scratch.

If apply certain moment of torsion for output shaft 30, irrespectively and according to the determined moment of torsion of the gear ratio of planetary gear set PG will be applied on input shaft 10 and the variable-speed shaft 20 with the speed of each workpiece of described planetary gear set PG.Therefore, in described planetary gear set PG, can control the speed of variable-speed shaft 20, change the speed of output shaft 30, yet in this case,, need to consume bigger output on the braking device because the moment of torsion that applies on the variable-speed shaft 20 is bigger with this with braking device.

Technology contents:

Therefore, for addressing the above problem, the object of the present invention is to provide a kind of electric stepless speed variator, described device not only directly connects power by planetary gear set, and uses motor can change the speed of described power continuously.

To achieve these goals, the related stepless speed variator of embodiments of the invention can comprise: first planetary gear set comprises first workpiece, second workpiece and the 3rd workpiece; And second planetary gear set, comprise the 4th workpiece, the 5th workpiece and the 6th workpiece.Wherein, described first workpiece, the 5th workpiece are connected with input shaft, and receive driving power; Described the 3rd workpiece is fixedlyed connected with the 6th workpiece; Described second workpiece is connected with variable-speed shaft, and receives the variable-speed dynamic that is used for speed change; And described the 4th workpiece can be connected with output shaft.

The related stepless speed variator of the second embodiment of the present invention more comprises the gear on worm that is used to connect described first planetary gear set and second planetary gear set, and described gear on worm can comprise the worm screw that is connected with described the 3rd workpiece; With the worm gear that is connected with described the 6th workpiece.

In the stepless speed variator that embodiments of the invention relate to, can be provided with first adjusting gear, second adjusting gear that are used to change gear ratio between first workpiece and the input shaft and between the 5th workpiece and the input shaft, thus the speed that makes the input shaft that is connected with described first workpiece, the 5th workpiece with output shaft that described the 4th workpiece is connected on offset.

In the stepless speed variator that the second embodiment of the present invention relates to, offset for the big gear ratio that makes the gear on worm that connects the 3rd workpiece, the 6th workpiece, be provided with the 3rd adjusting gear, the 4th adjusting gear that is used to change gear ratio between the worm screw of described gear on worm and the 3rd workpiece and between the worm gear of described gear on worm and the 6th workpiece.

Come the required moment of torsion of worm screw of rotary worm gear to equal to act on moment of torsion of worm screw and poor by the moment of torsion of the generation of the frictional force between worm gear and the worm screw by the variable-speed shaft that is connected with described second workpiece of rotation by worm gear.Because the difference of described two moments of torsion is littler than the moment of torsion that is applied to output shaft, so the outputting power of the variable-speed dynamic of variable-speed shaft meeting specific output axle is little.

In the stepless speed variator that embodiments of the invention relate to, though the speed of described input shaft on described output shaft, offset, yet the moment of torsion that is applied to described output shaft may not can be offset on described input shaft.

As the variable-speed dynamic of the variable-speed shaft that is connected with described second workpiece, can use the little motor of outputting power of output specific output axle.

The motor that described motor can use actuating motor or brake a little perhaps can be the use that combines of the gear on worm that can prevent to reverse and motor.

The stepless speed variator that embodiments of the invention relate to can only use a little variable-speed dynamic of output to control big outputting power, therefore is easier to control, and simple in structure.On the other hand, most power is by the gear transmission of minority, thereby the transmission efficiency height.And the whole gear transmission of power by directly connecting are not so except the power loss that takes place because of gear on worm, have any power loss.

Description of drawings:

Fig. 1 is the schematic representation of the conventional stepless speed variator that is made of a planet gear train.

Fig. 2 is when the input speed of stepless speed variator is constant among Fig. 1, the plotted curve of each gear speed of expression under the different velocity conditions of variable-speed shaft.

Fig. 3 is the schematic representation of the stepless speed variator that is made of two planetary gear set that relates to of embodiments of the invention.

Fig. 4 be another embodiment of the present invention relate to pass through the schematic representation that gear on worm connects the stepless speed variator of two planetary gear set.

Fig. 5 is the plotted curve of each gear speed when the input speed of stepless speed variator is constant among Fig. 4.

Fig. 6 is the plotted curve of the input speed of stepless speed variator among Fig. 4 each gear speed when changing stage by stage.

Fig. 7 is the plotted curve of the input speed of stepless speed variator among Fig. 4 each gear speed when changing stage by stage and increasing.

Embodiment:

Below, with reference to accompanying drawing the preferred embodiments of the present invention are described in detail.

Fig. 3 is the schematic representation of the stepless speed variator that is made of two planetary gear set that relates to of embodiments of the invention.

As shown in Figure 3, the stepless speed variator that is made of two planetary gear set that relates to of embodiments of the invention comprises input shaft 10, variable-speed shaft 20, output shaft 30, the first planetary gear set PG1, the second planetary gear set PG2.

The first planetary gear set PG1 comprises the first sun gear S1, the first planet carrier C1 and the first gear ring R1 as its workpiece.The second planetary gear set PG2 comprises the second sun gear S2, the second planet carrier C2 and the second gear ring R2 as its workpiece.

The described first sun gear S1 is connected with input shaft 10 with the second planet carrier C2 and receives driving power, and the first gear ring R1 and the second gear ring R2 are mutually permanently connected.The described first planet carrier C1 is connected with variable-speed shaft 20 and receives variable-speed dynamic, and the described second sun gear S2 is connected and the power of cvt output device with output shaft 30.

The described stepless speed variator that is made of two planetary gear set can be between the first sun gear S1 and the input shaft 10, be respectively arranged with the first adjusting gear F1, the second adjusting gear F2 that is used to change gear ratio and sense of rotation between the second planet carrier C2 and the input shaft 10.Thereby the speed that makes the input shaft 10 that is connected with the second planet carrier C2 with the first sun gear S1 with output shaft 30 that the described second sun gear S2 is connected on offset.

Described first gear ring R1, the second gear ring R2 of stepless speed variator that constitutes by two planetary gear set by fixedlying connected with the described second planet carrier C2, the speed that makes the input shaft 10 that is connected with the first sun gear S1 with output shaft 30 that the second sun gear S2 is connected on offset, so the speed of output shaft 30 changes pro rata with respect to the speed of the variable-speed shaft 20 that connects with the first planet carrier C1.Be applied to first gear ring R1, the second gear ring R2 of moment of torsion on the output shaft 30 that is connected with the described second sun gear S2 by fixedlying connected with the second planet carrier C2, with input shaft 10 that the first sun gear S1 is connected on offset, therefore the moment of torsion that is applied on the output shaft 30 can all be applied on the variable-speed shaft 20 that is connected with the first planet carrier C1.Therefore, a kind of big power motor as the output of output shaft 30 of the stepless speed variator needs that the embodiments of the invention that are made of two planetary gear set relate to, and its variable-speed dynamic as variable-speed shaft 20 is used.

Fig. 4 be another embodiment of the present invention relate to pass through the schematic representation that gear on worm connects the stepless speed variator of two planetary gear set.

As shown in Figure 4, another embodiment of the present invention relates to passes through the stepless speed variator that gear on worm connects two planetary gear set and comprises: input shaft 10, variable-speed shaft 20, output shaft 30, the first planetary gear set PG1, the second planetary gear set PG2 and have and be used to connect the worm screw W1 of the described first planetary gear set PG1 and the second planetary gear set PG2 and the gear on worm of worm gear W2.

The first planetary gear set PG1 comprises the first sun gear S1, the first planet carrier C1 and the first gear ring R1 as its workpiece.And, be connected with first small gear (not shown) that the gear with the described first sun gear S1 and the first gear ring R1 combines on the described first planet carrier C1.

The second planetary gear set PG2 comprises the second sun gear S2, the second planet carrier C2 and the second gear ring R2 as its workpiece.And, be connected with second small gear (not shown) that the gear with the described second sun gear S2 and the second gear ring R2 combines on the described second planet carrier C2.

The described first sun gear S1 is connected with input shaft 10 with the second planet carrier C2 and receives driving power, and the first gear ring R1 is connected by described gear on worm with the second gear ring R2.The described first planet carrier C1 is connected with variable-speed shaft 20 and receives variable-speed dynamic, and the described second sun gear S2 is connected with output shaft 30.

Another embodiment of the present invention relates to passes through stepless speed variator that gear on worm connects two planetary gear set and can comprise and be used to change between the first sun gear S1 and the input shaft 10 and the first adjusting gear F1 of the gear ratio between the second planet carrier C2 and the input shaft 10, the second adjusting gear F2, thus the speed that makes the input shaft 10 that is connected with the second planet carrier C2 with the first sun gear S1 with output shaft that the described second sun gear S2 is connected on offset.For the big gear ratio that makes the gear on worm that connects the described first gear ring R1 and the second gear ring R2 is offset, stepless speed variator of the present invention more can comprise between the worm screw W1 that is used to change gear on worm and the first gear ring R1 and the 3rd adjusting gear G1, the 4th adjusting gear G2 of gear ratio between the worm gear W2 of gear on worm and the second gear ring R2.The described first adjusting gear F1, the second adjusting gear F2, the 3rd adjusting gear G1, the 4th adjusting gear G2 have fixedly the commutating tooth wheels or the bevel gear set of gear ratio.

In the stepless speed variator that passes through two planetary gear set of gear on worm connection that another embodiment of the present invention is related, if be connected in the described first sun gear S1 and the second planet carrier C2 input shaft 10 speed with output shaft 30 that the second sun gear S2 is connected on counteracting, the speed that then is connected to the output shaft 30 of the second sun gear S2 can change pro rata with the speed of the variable-speed shaft 20 that is connected to the first planet carrier C1.Offset on the output shaft 30 that is connected in the second sun gear S2 for the speed that makes the input shaft 10 that is connected to the described first sun gear S1 and the second planet carrier C2, the described first adjusting gear F1, the second adjusting gear F2 have specific gear ratio.If the gear ratio of the described first adjusting gear F1, the second adjusting gear F2 is expressed as f1, f2, then the relation of f1 and f2 is as follows:

$\frac{f_1}{{\mathrm{<figure-callout\; id="2"\; label="f"\; filenames="H2009101345658E0000021.png,H2009101345658E0000031.png"\; state="\{\{state\}\}">f</figure-callout>}}_2}=-\frac{h}{g1\mathrm{<figure-callout\; id="2"\; label="g"\; filenames="H2009101345658E0000021.png,H2009101345658E0000031.png"\; state="\{\{state\}\}">g</figure-callout>}2}\frac{1+\frac{s2}{r2}}{\mathrm{<figure-callout\; id="1"\; label="s"\; filenames="H2009101345658E0000031.png"\; state="\{\{state\}\}">s</figure-callout>}1/\mathrm{<figure-callout\; id="1"\; label="r"\; filenames="H2009101345658E0000031.png"\; state="\{\{state\}\}">r</figure-callout>}1}$

At this moment, the speed of the input shaft 10 that is connected with the second planet carrier C2 with the described first sun gear S1 with output shaft 30 that the described second sun gear S2 is connected on offset.Wherein, r1, r2 are respectively the number of teeth of the first gear ring R1, the second tooth figure R2, s1, s2 are respectively the number of teeth of the first sun gear S1, the second sun gear S2, g1, g2 are the gear ratio of the 3rd adjusting gear G1, the 4th adjusting gear G2, h is the gear ratio of the worm screw W1 and the worm gear W2 of gear on worm, and negative sign represents that the sense of rotation of two gears is opposite.

In the stepless speed variator that passes through two planetary gear set of gear on worm connection that another embodiment of the present invention relates to, be applied to the second sun gear S2 that described output shaft 30 is connected on moment of torsion be delivered on the input shaft 10 by the second planet carrier C2, yet can not be delivered on the input shaft 10 that is connected with the first sun gear S1 because of gear on worm.Therefore, though the speed of input shaft 10 is offset on output shaft 30, the moment of torsion that is applied to output shaft 30 can not be offset on input shaft 10.

The moment of torsion that acts on the worm screw W1 of described gear on worm comprises, acts on the moment of torsion of worm screw W1 and the moment of torsion that produces by the worm screw W1 and the frictional force between the worm gear W2 of gear on worm by the moment of torsion that is applied on the second sun gear S2 that is connected with output shaft 30 via the worm gear W2 of the gear on worm that is connected with the second gear ring R2.The difference of described two moments of torsion is to make the sense of rotation rotation required moment of torsion of the worm screw W1 of gear on worm to worm gear W2.

It is close with the size of the moment of torsion that produces by worm screw W1 and frictional force between the worm gear W2 that worm gear W2 by described gear on worm acts on the moment of torsion of worm screw W1, so the missionary society of described two moments of torsion is very little with respect to the moment of torsion that is applied to output shaft 30.And for the worm screw W1 with gear on worm rotates to the sense of rotation of worm gear W2, the moment of torsion that is applied on the variable-speed shaft 20 that is connected with the first planet carrier C1 is also very little, so the variable-speed dynamic of variable-speed shaft 20 can be very little with respect to the outputting power of output shaft 30.

The stepless speed variator that passes through two planetary gear set of gear on worm connection that another embodiment of the present invention is related can use the power source of the little motor of output as variable-speed shaft 20, and can use the big power of output as the power source of described input shaft 10.

In the stepless speed variator that passes through two planetary gear set of gear on worm connection that another embodiment of the present invention is related, if the constant airspeed of input shaft 10, and the speed of the variable-speed shaft 20 that is connected with the first planet carrier C1 increase of starting from scratch, and this moment gear on worm speed from it according to the described first planetary gear set PG1, the second planetary gear set PG2, the gear on worm and the first adjusting gear F1, the second adjusting gear F2, the 3rd adjusting gear G1, the determined predetermined speed of the gear ratio of the 4th adjusting gear G2 reduces, the then speed of output shaft 30 increase of will starting from scratch.If the speed of variable-speed shaft 20 is increased to the speed of gear on worm when being zero, the speed when then the speed of output shaft 30 will be increased to its speed at gear on worm and is zero from zero.If the speed of described gear on worm further reduces to cause its sense of rotation opposite, the moment of torsion that then acts on the worm screw W1 of gear on worm shows as that worm gear W2 by described gear on worm acts on the moment of torsion of worm screw W1 and the closing of the moment of torsion that produces by the frictional force between worm screw W1 and the worm gear W2, thus with variable-speed shaft 20 that the first planet carrier C2 is connected on need big outputting power.

Gear ratio according to the described first planetary gear set PG1, the second planetary gear set PG2, gear on worm and the first adjusting gear F1, the second adjusting gear F2, the 3rd adjusting gear G1, the 4th adjusting gear G2, the speed of the speed of described variable-speed shaft 20 and output shaft 30 has man-to-man corresponding relation, and the speed of output shaft 30 is determined according to the speed of described variable-speed shaft 20.If the described variable-speed shaft 20 of counterrotating, then output shaft 30 also can counterrotating.And if reduce or increase the speed of described input shaft 10, then the slewing range of output shaft 30 velocity variations also just diminishes or becomes big, thereby causes the top speed of output shaft 30 to reduce or increase.As shown in Figure 5, the speed when being increased to its speed and the being reduced to zero if speed of variable-speed shaft 20 is started from scratch at gear on worm (being represented as intermediate gear among the figure), the speed when then the speed of output shaft 30 will be increased to its speed at gear on worm and is zero from zero.

In the stepless speed variator that passes through two planetary gear set of gear on worm connection that another embodiment of the present invention is related, according to the described first planetary gear set PG1, the second planetary gear set PG2, the gear on worm and the first adjusting gear F1, the second adjusting gear F2, the 3rd adjusting gear G1, the gear ratio of the 4th adjusting gear G2, the speed of the speed of described variable-speed shaft 20 and output shaft 30 has man-to-man corresponding relation, and the speed of output shaft 30 is determined according to the speed of described variable-speed shaft 20, therefore if the variable-speed dynamic of motor as described variable-speed shaft 20 used, then can change the speed of output shaft 30 according to the speed of institute's use motor.And if counterrotating variable-speed shaft 20, then output shaft 30 also can counterrotating.

In the stepless speed variator that passes through two planetary gear set of gear on worm connection that another embodiment of the present invention is related, worm gear W2 by gear on worm acts on the moment of torsion of worm screw W1 and the size of the moment of torsion that produces by the frictional force between worm screw W1 and the worm gear W2 is similar, therefore the missionary society of described two moments of torsion is very little with respect to the moment of torsion that is applied on the output shaft 30, and the moment of torsion that is applied on the variable-speed shaft 20 that is connected with the first planet carrier C2 to the sense of rotation rotation of worm gear W2 for the worm screw W1 that makes gear on worm is also very little, thereby the variable-speed dynamic of variable-speed shaft 20 can be very little with respect to the outputting power of output shaft 30.Therefore, can change after the big input speed of output its output with the little motor of output, and in order to keep the speed of required variable-speed shaft 20, the motor that can use actuating motor or brake a little, but also the use that the gear on worm that can prevent counterrotating can be combined with motor.

In the stepless speed variator that passes through two planetary gear set of gear on worm connection that another embodiment of the present invention is related, fixedly connected power on the described input shaft 10 perhaps can optionally connect in the plural power with friction speed on described input shaft 10.As shown in Figure 4, according to the speed of described output shaft 30, can optionally be connected in a plurality of gear trains with different gear ratio one and transferring power to input shaft 10, thereby change the moment of torsion that is applied on the input shaft 10.In the stepless speed variator that passes through two planetary gear set of gear on worm connection that another embodiment of the present invention is related, on three kinds of gear trains, optionally connect input shaft 10, and change the speed of input shaft 10 by stages with this, this moment each gear speed as shown in Figure 6.The speed of described output shaft 30 is irrelevant with the speed of the input shaft 10 that changes stage by stage, and increases with the speed of variable-speed shaft 20.

In the stepless speed variator that passes through two planetary gear set of gear on worm connection that another embodiment of the present invention is related, if described gear on worm does not stop, then owing to the frictional force between worm screw W1 and the worm gear W2 produces power consumption.As shown in Figure 7, in order to reduce the power consumption that produces because of the frictional force between worm screw W1 and the worm gear W2, if increase the speed of input shaft 10 stage by stage, so that the speed of gear on worm keeps minimum, then the efficient of stepless speed variator will be very outstanding.

The stepless speed variator that passes through two planetary gear set of gear on worm connection that another embodiment of the present invention is related can only use a little variable-speed dynamic of output to control the big power of output, therefore controls than being easier to, and simple in structure.On the other hand, most power is by the gear transmission of minority, thereby the transmission efficiency height.And the whole gear transmission of power, so except the power loss that takes place because of gear on worm, there is not any power loss by directly connecting.

And stepless speed variator provided by the invention further comprises sensor 1,2,3,4,5 and connected controller 6 for its working automation.Described controller 6 is controlled the variable-speed dynamic of variable-speed shaft 20 based on the checkout value of described sensor 1,2,3,4,5.The sensor 1,2,3,4,5 and controller 6 equally also can be applied on the related stepless speed variator that is made of two planetary gear set of as shown in Figure 3 the embodiment of the invention.

Accelerator pedal sensor 1 detects the position of accelerator pedal (not shown) and this signal is passed to controller 6.Described accelerator pedal sensor 1 can be the engine load sensor with the work of accelerator pedal interlock.Brake pedal sensor 2 detects the position of braking pedal and this signal is passed to controller 6.Gear shift sensor 3 detects shift pattern and this signal is passed to controller 6.Engine speed sensor 4 is installed on the crankshaft (not shown), and comes the speed of detection of engine according to the phase change of crankshaft, then this signal is passed to controller 6.Vehicle speed sensor 5 is installed on each tire (not shown), and detects the speed of a motor vehicle according to the phase change of tire, then this signal is passed to controller 6.

More than, the preferred embodiments of the present invention are described, but the present invention is not limited to described embodiment, based on the above embodiment of the present invention, the person of ordinary skill in the field can do various changes and modification to the present invention.All any modifications of being done within the spirit and principles in the present invention, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (9)

1. a stepless speed variator is characterized in that, comprising:

First planetary gear set, it comprises first workpiece, second workpiece and the 3rd workpiece; And

Second planetary gear set, it comprises the 4th workpiece, the 5th workpiece and the 6th workpiece,

Wherein, described first workpiece, the 5th workpiece are connected with input shaft, and receive driving power;

Described the 3rd workpiece is fixedlyed connected with the 6th workpiece;

Described second workpiece is connected with variable-speed shaft, and receives the variable-speed dynamic that is used for speed change; And

Described the 4th workpiece is connected with output shaft.

2. stepless speed variator according to claim 1 is characterized in that:

More comprise the gear on worm that is used to connect described first planetary gear set and second planetary gear set,

Described gear on worm comprises the worm screw that is connected with described the 3rd workpiece; With the worm gear that is connected with described the 6th workpiece.

3. stepless speed variator according to claim 1 and 2 is characterized in that:

Between first workpiece and the input shaft, be provided with first adjusting gear, second adjusting gear that is used to change gear ratio between the 5th workpiece and the input shaft, thus the speed that makes the input shaft that is connected with described first workpiece, the 5th workpiece with output shaft that described the 4th workpiece is connected on offset.

4. stepless speed variator according to claim 2 is characterized in that:

Offset for the big gear ratio that makes the gear on worm that connects described the 3rd workpiece and the 6th workpiece, be provided with the 3rd adjusting gear, the 4th adjusting gear that is used to change gear ratio between the worm screw of described gear on worm and the 3rd workpiece and between the worm gear of described gear on worm and the 6th workpiece.

5. stepless speed variator according to claim 1 and 2 is characterized in that:

The speed of the input shaft that will be connected with first workpiece, the 5th workpiece with output shaft that the 4th workpiece is connected on offset, thereby the speed of output shaft is changed pro rata with the speed of the variable-speed shaft that is connected with described second workpiece.

6. stepless speed variator according to claim 1 and 2 is characterized in that:

The speed of described input shaft is offset on described output shaft, but the moment of torsion that is applied to described output shaft is not offset on described input shaft.

7. stepless speed variator according to claim 2 is characterized in that:

Equal to act on the moment of torsion of worm screw and the moment of torsion that produces because of the frictional force between worm gear and the worm screw poor by rotating the required moment of torsion of worm screw that the variable-speed shaft that connects on described second workpiece comes the rotary worm gear by worm gear, because the difference of described two moments of torsion is littler than the moment of torsion that is applied to output shaft, the outputting power of the variable-speed dynamic specific output axle of variable-speed shaft is little.

8. stepless speed variator according to claim 1 and 2 is characterized in that:

As the variable-speed dynamic of the variable-speed shaft that is connected with described second workpiece, use the little motor of outputting power of output specific output axle.

9. stepless speed variator according to claim 8 is characterized in that:

As described motor, the motor that uses actuating motor or braking a little perhaps can prevent the use that combines of the gear on worm of counterrotating and motor.

Images