KR101919562B1 - Applying both sides variable pulley Continuously variable transmission Motive-power transmission appratus - Google Patents

Abstract

The present invention relates to a continuously variable transmission. More specifically, the present invention uses the continuously variable transmission provided with a belt which connects an input shaft and an output shaft to transmit power generated by an engine or a motor. Moreover, the groove width of the pulley is configured to be adjustable equally on both sides of the center of the belt. Therefore, even if the width of the input shaft and the output shaft pulley varies, the present invention does not have axial displacement and deformation, thereby preventing uneven wear of the belt and minimizing power loss. To this end, the transmission comprises a guide fixing body, a variable pulley unit and a belt, and the width of the variable pulley unit is adjusted simultaneously on both sides of the center by using an actuator unit and a push block unit.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a continuously variable transmission (hereinafter referred to as " continuously variable transmission "

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuously variable transmission including a continuously variable transmission provided with a belt connecting an input shaft and an output shaft, Both sides of the belt being adjustable in the same way so that the belt does not have axial displacement and deformation even when the width of the input shaft and output shaft poly varies, so that the belt is prevented from uneven wear and power loss can be minimized. To a continuously variable transmission power transmission apparatus to which a pulley is applied.

In a power transmitting apparatus for transmitting an output of an engine to a drive wheel, a shift device for determining an appropriate reduction ratio may be classified into a manual transmission, an automatic transmission, a continuously variable transmission, and the like.

As is well known to those skilled in the art, the continuously variable transmission is a type in which an endless track type belt is connected to a pulley provided on an input shaft and an output shaft, respectively, and the outer diameter of the belt is varied according to the movement of the pulley.

Prior art of a power transmission apparatus having such a conventional continuously variable transmission is disclosed in Korean Patent Laid-Open Publication No. 10-2015-0113117 and Korean Patent Laid-Open Publication No. 10-2001-0009674 .

1 to 3, such a conventional power transmission apparatus has a structure in which the width of a groove in which the belt 60 is caught between the drive pulley 30 of the input shaft 10 and the both sides of the driven pulley 40 of the output shaft 20 When the width 31 of the drive pulley 30 is narrowed, the belt 60 is stuck outside the pulley, thereby increasing the diameter of the pulley. On the other hand, the drive pulley 30 The belt 60 is hooked inward to reduce the diameter of the pulley.

Such a belt drive system changes the speed ratio steplessly by changing the widths of both pulleys, and the width of each pulley is adjusted through the actuator 50. [

In other words, when the effective diameter of the drive pulley 30 is small, the effective diameter of the driven pulley 40 is increased to obtain a low-speed gear stage. On the contrary, when the effective diameter of the drive pulley 30 is large, 40 can be reduced and the high-speed gear stage can be obtained.

One side of the drive pulley 30 forming the width 31 rotates integrally with the input shaft 10 with the fixed pulley 30a and the other side thereof is slid along the input shaft 10 with the variable pulley 30b And the width 31 is adjusted in a movable structure.

The driven pulley 40 is constituted by the fixed pulley 40a and the variable pulley 40b in the same manner as the drive pulley 30 described above and the width 41 is configured to be adjustable as opposed to the drive pulley.

In other words, the adjustment of the widths 31 and 41 is adjustable only on one side equipped with a variable pulley instead of a fixed pulley.

2 and 3, in the conventional power transmission apparatus, the drive pulley 30 and the driven pulley 40 are composed of the fixed pulleys 30a and 40a and the variable pulleys 30b and 40b, Since the pulleys 30b and 40b are moved only by adjusting the position of the variable pulleys 30b and 40b in adjusting the pulleys 31 and 41, the belt 60 moves toward the center C of the belt 60 as described above.

2, in the conventional power transmission apparatus, the drive pulley 30 of the input shaft 10 is rotated by the fixed pulley 30a and the variable pulley 30b (see FIG. 2 (b) The belt 60 is extended to the outer periphery of the pulley and at the same time the working center of the belt 60 moves in the diagonal direction of the input shaft 10 due to the axial displacement.

The belt 60 is rotated as the drive pulley 30 of the input shaft 10 and the driven pulley 40 of the output shaft 20 are expanded and contracted at the same ratio, The power transmission is performed while being operated in the form of a straight line at a right angle to the axis and being stably moved from the center C to the movement center C '.

However, referring to FIG. 3, as described above, the conventional power transmission apparatus has a structure in which the variable pulley moves only on the side of the belt center C, Due to the difference in the actuator pressure between the drive pulley 30 and the variable pulleys 30b and 40b of the drive pulley 30 and the driven pulley 40 and the like, And the phase difference in the axial direction is obtained.

This causes the center C of the belt 60 to turn into a non-normal center C "with an angle? Changed in diagonal direction according to the phase change. This causes the rotational force of the belt 60, The vibration and noise are generated during the power transmission process due to the restoring force in the vertical direction, and the power transmission problems occur.

In addition, the deflection of the center position of the belt 60 can only lead to eccentricity on one side of the belt 60, which eventually leads to uneven wear of the belt as time goes by and wears only one side of the belt 60, Which makes it difficult to carry out the transfer.

Damage caused by the uneven wear of the belt 60 causes a loss of normal power transmission and shortens the lifetime of the apparatus.

Accordingly, there is a demand for development of a power transmission device capable of reducing the damage of the belt and preventing the belt from being damaged.

Korean Patent Publication No. 10-2015-0113117 (published on October 10, 2015) Korean Unexamined Patent Application Publication No. 10-2001-0009674 (published Feb. 2, 2001)

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a variable pulley provided on both sides of a belt, And it is an object of the present invention to provide a power transmission apparatus which is configured to minimize loss.

In order to achieve the above-mentioned object, the continuously variable transmission power transmission apparatus employing a double-sided variable pulley according to the present invention winds a belt between an input shaft and a pulley provided on an output shaft to transmit power.

To this end, it includes a guide fixture, a variable pulley portion, an actuator portion, and a push block portion.

The variable pulley portion is provided so as to be able to move and rotate together with the input shaft or the output shaft so as to adjust the width at both sides of the belt center by the slide portion along the longitudinal direction.

The guide fixture is provided on both sides of the variable pulley portion without interfering with the rotation of the input shaft and the output shaft, and has an inner space opened toward the variable pulley portion.

The actuator portion is provided in an inner space of the guide fixing body.

The push block portion moves forward or backward along the inner space of the guide fixed body by the operation of the actuator portion to move the variable pulley portion connected to the thrust bearing.

According to the above-described configuration, in the power transmission apparatus, the variable pulley portion adjusts the width on both sides of the center C in accordance with the forward or backward movement of the push block portion, and adjusts the belt tension mounted without changing the position of the belt center (C) Will be delivered.

On the other hand, if necessary, the variable pulley portion is provided on the input shaft and the output shaft, respectively.

More specifically, the guide fixture has an upper guide and an inner guide for guiding the movement of the push block portion, and the push block portion is provided so as to be inscribed between the upper guide and the inner guide.

On the other hand, the slide portion has a key and a key-groove structure or a ball spline structure.

And, in one embodiment, the actuator portion is configured such that one end of the rod is coupled to the push block portion integrally with the coupling member in one of the electric actuator and the pneumatic actuator.

Preferably, a plurality of the actuator portions are formed along the turning radius of the variable pulley portion so as to stably move the push block portion.

On the other hand, in another embodiment, the actuator section is composed of a motor fixed to the guide fixed body and a rotary gear connected to the rotation axis of the motor.

At this time, the push block portion forms a thread along the inner circumferential surface so as to engage with the rotary gear, and adjusts the width by moving the variable pulley portion by advancing or retracting along the guide fixed body by the meshing rotation of the screw and the rotary gear.

At this time, preferably, the upper guide or the inner guide of the guide fixture contacting the push block portion forms a thread, and the push block portion contacting the upper guide or the inner guide having threads is further formed with a thread to be engaged therewith.

As described above, the continuously variable transmission power train using the variable pulleys according to the present invention has the effect that the position of the variable pulley portion provided on the input shaft or the output shaft is shifted on both sides of the belt in accordance with the forward or backward movement of the push block portion. I have.

In addition, it has an effect of preventing the eccentricity of the belt which transmits the power, thereby preventing damage to the belt and minimizing the power transmission loss.

In addition, since the width of the belt is adjusted simultaneously on both sides of the center of the belt, there is no phase change of the belt, and vibration and noise are prevented from being generated during the power transmission process.

1 and 2 are conceptual diagrams showing a power transmission device according to the prior art.
3 is a schematic view showing a problem of a power transmission device according to the prior art.
4 (a) and 4 (b) are schematic views showing the operation and operation of the continuously variable transmission of the present invention, in which both side variable pulleys are applied.
5 (a) and 5 (b) are schematic views showing the operation and operation of the continuously variable transmission with the double-sided variable pulley according to another embodiment of the present invention.
FIG. 6 is a conceptual diagram showing the effect of the continuously variable transmission power train using a double-sided variable pulley according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In describing the present invention, it is assumed that the front portion indicates the portion corresponding to the center direction or the direction thereof with respect to the center of the width of the variable pulley portion, and the rear portion indicates the portion opposite thereto or the direction thereof do.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted so as to avoid obscuring the subject matter of the present invention.

4 (a) and 4 (b) are schematic views showing an operation and operation of the continuously variable transmission with variable side pulleys according to an embodiment of the present invention, and FIGS. 5 (a) FIG. 6 is a conceptual diagram showing the effect of the continuously variable transmission power transmission apparatus using the variable pulleys of both sides according to the present invention. FIG. 6 is a schematic view showing the operation and operation of the continuously variable transmission with the variable pulley according to another embodiment.

As shown in the drawing, the continuously variable transmission power train using both side variable pulleys according to the present invention includes a guide fixed body 110, a variable pulley portion 120, a belt 130, an actuator portion 140, (150).

At this time, the variable pulley portion 120 and the push block portion 150 are connected by the thrust bearing 180, and the rotation of the variable pulley portion 120 does not affect the push block portion 150.

The variable pulley portion 120 adjusts the width 121 on both sides of the center C of the belt 130 in accordance with the forward or backward movement of the push block portion 150, And the tension of the belt 130 is adjusted to transmit the power.

More specifically, the continuously variable transmission power train including both-side variable pulleys according to the present invention is provided with a continuously variable transmission. The power transmission apparatus includes a variable pulley portion 120 provided on the input shaft 10 and the output shaft 20, The variable pulley portion 120 is moved from both sides of the center C of the belt 130 so that the center of the width 121 is adjusted without any change do.

Thus, the phase difference of the belt 130 mounted on the pulley can be eliminated, thereby preventing uneven wear and minimizing power transmission loss.

The variable pulley portion 120 may be installed on both the input shaft 10 and the output shaft 20 and may be installed on either one of the input shaft 10 and the output shaft 20 Of course.

The actuator unit 140 has a structure in which the variable pulley unit 120 pushes the variable pulley unit 120 so that the variable pulley unit 120 can move along the longitudinal direction of the input shaft 10 or the output shaft 20.

The variable pulley portion 120 is provided on both the input shaft 10 and the output shaft 20 on both axes of the input shaft 10 and the output shaft 20, It shall be specified once again that it can be installed or installed on any one axis.

4 to 6, the variable transmission pulley is applied to both sides of the center C of the belt 130, and the variable pulley 120 moves simultaneously to the center C side, And includes a guide fixture 110, an actuator unit 140, and a push block unit 150.

More specifically, the guide fixing body 110 is fixed to an outer frame (not shown) in which the power transmitting device is configured without interfering with the rotation of the input shaft 10 and the output shaft 120 along the axis in which the variable pulley portion 120 is installed And has an internal space S that is installed on both sides of the variable pulley portion 120 and opens toward the variable pulley portion 120. [

The guide fixture 110 has an upper guide 111 and an inner guide 112 to support and guide the movement of the push block 150.

In this case, it is preferable that the push block portion 150 is provided so as to be inscribed in the upper guide 111 and the inner guide 112.

The variable pulley portion 120 adjusts the width 121 on both sides of the center C of the belt 130 by the slide portion 170 along the longitudinal direction of the input shaft 10 or the output shaft 20 And is installed so as to rotate together with a shaft which is movably installed.

In this case, as described above, the slide part 170 is movable along the axis along which the variable pulley part 120 is installed, and rotates together with the shaft. The key or the groove serves as a guide with a normal key and a key- Or may have a ball spline structure.

Such a key, a key groove structure, or a ball spline structure is a known structure, and a detailed description thereof will be omitted.

An actuator unit 140 is formed in the inner space S of the guide fixture 110.

4A and 4B, the actuator unit 140 is represented by one of an electric actuator and a pneumatic actuator, and the push block unit 150 is pushed to connect the variable pulley unit 120 to the center C) direction, various structures can be applied.

4A and 4B, one end of the rod 141 is integrally coupled to the push block 150 by a coupling member 160, and the actuator 140 is coupled to the actuator block 140 The push block 150 moves forward or backward by guiding the guide fixing body 110 according to the operation.

Specifically, the push block portion 150 is moved forward or backward along the internal space S of the guide fixing body 110 by the operation of the actuator portion 140. One end of the push block portion 150 is supported by a thrust bearing And the variable pulley portion 120 is integrally connected to the variable pulley portion 120 by means of the pulley portion 180.

Even though the thrust bearing 180 rotates together with the variable pulley portion 120 and the shaft, the push block portion 150 performs only the forward or backward motion along the guide fixing body 110 and rotates together with the shaft Do not exercise.

The thrust bearing 180 is generally known in the art and a description thereof will be omitted.

It is preferable that a plurality of actuator units 140 are formed along the rotation radius of the rotating variable pulley unit 120 and the push block unit 150 is configured to correspond to the actuator unit 140 desirable.

5 (a) and 5 (b), another embodiment of the present invention will be described below.

As described above, the actuator unit 140 is configured to advance or retract the push block unit 150 so that the variable pulley unit 120 moves away from the center C or approaches the center.

Another structure of the actuator unit 140 may have a mechanical structure using the motor M and the rotary gear 142.

Specifically, the actuator unit 140 includes a motor M fixed to the guide fixing body 110, and a rotary gear 142 connected to the rotation shaft of the motor M.

At this time, the push block portion 150 forms a thread 151 along the inner circumferential surface to engage with the rotary gear 142.

The screw 151 of the push block portion 150 and the rotary gear 142 are engaged and rotated according to the operation of the motor M and the push block portion 150 is rotated by the guide fixture 110 so that the variable pulley portion 120 is simultaneously moved on both sides of the center C of the belt to adjust the width 121.

The upper guide 111 or the inner guide 112 of the guide fixture 110 in contact with the push block portion 150 forms a thread for stable forward or backward movement of the push block portion 150 .

The push block portion 150, which is in contact with the threaded upper guide 111 or the inner guide 112, further forms a thread to be engaged therewith.

4 (a), 5 (b) and 5 (a) and 5 (b), the continuously variable transmission power transmission apparatus using both side variable pulleys according to the present invention has the input shaft 10 and the output shaft 20 is provided with a variable pulley portion 120 and is wound around a belt 130 to transmit power.

The variable pulley portion 120 is provided on both sides of the center C of the belt and connected to the push block portion 150 which is moved forward or backward in each of the guide fixed bodies 110 by a thrust bearing 180 And is moved by the structure of the slide part 170 in the longitudinal direction of the installed shaft according to the movement of the push block part 150. [

At this time, the push block 150 is moved using the guide fixing body 110 as a guide and moved by the actuator unit 140.

Referring again to FIG. 6, in the power transmission apparatus according to the present invention, as shown in FIG. 6A, the variable pulley portion 120 of the input shaft 10 is moved in the A 'or A "direction from the point A Since the width of the variable pulley portion 120 is adjusted by the actuator 140 at both sides of the center C of the belt at the same time even if the width 121 of the variable pulley portion 120 is adjusted, The position does not change even if it moves.

Accordingly, the belt 130 can transmit the power in a stable manner without generating eccentricity that is biased to either side while maintaining the balance of force.

6 (b), even if the variable pulley portion 120 of the output shaft 20 is moved in the direction B 'or B' from point B to adjust the width 121, Since the width of the variable pulley portion 120 is adjusted by the actuator 140 at both sides, the center C does not change its position even if the variable pulley portion 120 moves.

Accordingly, the belt 130 on which the pulley is wound can transmit the power in accordance with the adjustment of the width 121 without generating eccentricity biased to either side.

The actuator unit 140, which provides power to move the variable pulley unit 120, can be compactly designed and minimize power transmission loss.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. It is not.

110: Guide fixture 120: Variable pulley part
121: width 130: belt
140: actuator unit 142: rotary gear
150: push block part 151:
160: engaging member 170:
180: Thrust bearing

Claims (8)

A power transmission apparatus for winding a belt (130) between a pulley provided on an input shaft (10) and an output shaft (20) to transmit power,
And a variable pulley portion 171 that is movable and adjustable to adjust the width 121 on both sides of the center C of the belt 130 by the slide portion 170 along the longitudinal direction of the input shaft 10 or the output shaft 20, (120);
A guide fixing body 110 having an inner space S opened on both sides of the variable pulley portion 120 and interposed in the direction of the variable pulley portion 120 without interfering with rotation of the input shaft 10 and the output shaft 20 )Wow;
An actuator 140 disposed in the inner space S of the guide fixture 110;
A push block portion for moving the variable pulley portion 120 connected to the thrust bearing 180 by advancing or retracting along the internal space S of the guide fixing body 110 by the operation of the actuator portion 140 150);
The variable pulley portion 120 adjusts the width 121 on both sides of the center C of the belt 130 in accordance with the forward or backward movement of the push block portion 150, (130) adjusts the tension to deliver power;
The guide fixture 110 includes an upper guide 111 and an inner guide 112 for guiding the movement of the push block 150,
Wherein the push block portion (150) is inserted into the upper guide (111) and the inner guide (112).
The method according to claim 1,
The variable pulley unit 120 includes:
Wherein the input shaft (10) and the output shaft (20) are respectively provided with the input shaft (10) and the output shaft (20).
delete The method according to claim 1,
Wherein the slide portion (170) has a key, a key groove structure, or a ball spline structure.
The method according to claim 1,
Wherein one end of the rod 141 is integrally coupled to the push block portion 150 by a coupling member 160 in one of an electric actuator or a pneumatic actuator, Transmission power transmission.
6. The method of claim 5,
The actuator unit (140) includes a plurality of variable pulleys (120) and a plurality of variable pulleys (120).
The method according to claim 1,
The actuator unit 140 includes a motor M fixed to the guide fixing body 110 and a rotary gear 142 connected to a rotary shaft of the motor M,
The push block portion 150 is formed with a thread 151 along the inner circumferential surface so as to engage with the rotary gear 142 and is rotated by the rotation of the thread 151 and the rotary gear 142, 110) to move the variable pulley portion (120) so as to adjust the width (121) of the variable pulley portion (120).
8. The method of claim 7,
The upper guide 111 or the inner guide 112 of the guide fixing body 110, which is in contact with the push block portion 150, forms a thread,
Wherein the push block portion (150) contacting the upper guide (111) or the inner guide (112) with the threaded portion is further formed with a thread to be engaged therewith.

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