KR200170873Y1 - Automatic transmission pulley - Google Patents

Abstract

The present invention relates to a pulley, in which a drive shaft (1) and a driven shaft (2) are provided and a power transmission device (11) having a power transmission member (11) connecting the drive shaft (1) and the driven shaft (2), A sleeve 100 formed coaxially with the drive shaft 1 and receiving power of the drive shaft 1: formed coaxially with the drive shaft 1 and formed at a predetermined distance from the sleeve 100 to transmit the power; Pulley piece 200 for transmitting the power of the drive shaft (1) to the driven shaft (2) through the member (11): When the overload transmission to the pulley piece 200, the outer diameter of the pulley piece 200 is reduced inward Control means (300) for controlling and restoring the pulley piece (200) when the overload is released; A support member 400 formed coaxially with the drive shaft 1 and supporting the control means 300; A cover 500 having a pulley guide groove 510 for guiding the pulley piece 200 when the pulley piece 200 flows; In addition, the technical main purpose of the present invention is to provide an automatic transmission pulley configured to include; a tension roller 600 which maintains a constant tension of the power transmission member 11 when the pulley piece 200 is reduced. Therefore, there is an advantage of using the power transmitted from the drive shaft 1 in accordance with the load mechanically, by appropriately changing the outer diameter of the pulley piece 200 to transmit the rotational force corresponding to the load applied, and use the power efficiently without loss of power.

Description

Automatic transmission pulley

The present invention relates to a pulley which is a power transmission device. More specifically, when an overload is applied to a pulley which is a power transmission device that transfers power received from a power source, the outer diameter of the pulley is automatically reduced and controlled according to the load. And the automatic speed pulley in which the rotational speed of the driven side is changed in accordance with the change in the outer diameter of the pulley.

In general, the pulley is widely used as a power transmission device that transmits the power generated from power devices such as various engines and motors to various actual machines.

Pulleys as described above are simply used to transmit power and a pulley having a transmission function.

The power transmission device as described above will be described in detail with reference to the accompanying drawings.

First, Figure 1 shows a pulley that simply performs a power transmission function.

The pulley 10 coupled to the drive shaft 1 transfers the power transmitted from the drive shaft 1 to the driven shaft 2 using a V-belt or the like, which is the power transmission member 11, as a medium.

The pulley 10 as described above transfers the power of the drive shaft 1 received from a power source such as an engine or a motor to the driven shaft 2, and the load applied from the driven shaft 2 at the start and the driven shaft during rotation. It does not detect the load on (2). In addition, there is a problem that the load of the power source (motor, engine, etc.) is increased by not detecting a load applied during rotation, and waste of excessive energy is caused.

For the above reason, in the case of the general pulley 10, in consideration of the slip phenomenon of the belt which is the power transmission member 11 and the load applied from the driven shaft 2, the pulley 10 is generally used to increase the gear ratio and transmit a lot of force. The diameter of was made small. However, while transmitting a lot of power, there are many problems in the consumption of energy and the efficient use of energy.

A pulley having a shift function will be described with reference to FIG. 2.

As known, the continuously variable speed pulley is controlled by the rotation of the speed change pulley 20 by the movement of the inner wheel 21 and the out wheel 22 configured to interlock the outer edge.

That is, when the shaft distance between the inner wheel 21 and the out wheel 22 of the pulley is extended by using the elastic force and the centrifugal force of the compression coil spring, the power transmission member hung on the large diameter of the transmission pulley 20 (not shown) The pressure is applied to the belt, and by this pressure, the power transmission member is seated on the small diameter of the transmission pulley 20, thereby reducing the rotation speed of the driven shaft (not shown).

In addition, in order to increase the number of revolutions of the driven shaft (not shown), shifting is possible steplessly by appropriately changing the interaxial distance between the inner wheel 21 and the out wheel 22.

As described above, the conventional speed change pulley 20 adjusts the distance between the inner wheel 21 and the out wheel 22 to increase or decrease the rotation speed of the driven shaft (not shown). This method has a complicated mechanical structure to adjust the distance between the wheels has a difficult problem of manufacturing.

In addition, as described above, the transmission pulley 20 has a complicated mechanical structure, and thus, the volume of the transmission pulley 20 is increased, and the weight is increased, resulting in a decrease in power efficiency.

In addition, since the rotation speed of the shifting pulley 20 is increased by adjusting the distance between the shafts by using the inner wheel 21 and the out wheel 22, the shifting pulley (both on both sides of the driving shaft 1 and the driven shaft (not shown)) 20) need to be installed, there is a problem that brings a considerable burden in terms of installation difficulties and costs.

Therefore, the present invention, devised to solve the above problems, the object of the present invention is to provide a power transmission device that smoothly changes the outer diameter of the pulley in accordance with the load applied to the pulley which is a power transmission device. do.

Further, another object of the present invention is to provide a power transmission device in which the rotational speed of the driven shaft is automatically changed in accordance with the change in the outer diameter of the pulley, thereby preventing the loss of power and increasing the energy efficiency.

1-Schematic diagram showing a power train equipped with a pulley according to the prior art

2-Schematic diagram showing a power train provided with a speed change pulley according to the prior art

3-shows a sleeve according to the first embodiment of the present invention

4-perspective view of an automatic transmission pulley according to a first embodiment of the present invention

5-exploded perspective view of an automatic transmission pulley according to a first embodiment of the present invention

Figure 6-Schematic diagram showing a power transmission device provided with an automatic transmission pulley according to a second embodiment of the present invention

7-perspective view of an automatic transmission pulley according to a second embodiment of the present invention

8-exploded perspective view of an automatic transmission pulley according to a second embodiment of the present invention

9-exploded perspective view of the control means of the automatic transmission pulley according to the second embodiment of the present invention

10-Operation diagram of the automatic transmission pulley according to the second embodiment of the present invention

<Description of Symbols for Main Parts of Drawings>

1: drive shaft 2: driven shaft

11 power transmission member 100 sleeve

101: key groove 102: key

103: through hole 110,100`: protruding rib

111: protrusion rib coupling hole 120, 120`: snap ring fixing groove

121: snap ring 130: jam jaw

140: engaging projection 200,200`: pulley

210: pulley guide protrusion 201: home

211: coupling groove 220: fixing groove

221: receiving groove 222: pin insertion opening

223: pin 300,300 `: control means

310,310`: Joining piece 311: Joining hole

320,320`: Elastic spring 330: Supporting protrusion

331: through hole 340: support member

341: cover coupling groove 400: cover

401: inner cover 402: outer cover

403: sleeve ball 410: pulley guide groove

420: through hole 430: cover coupling hole

500: tension roller

The present invention for achieving the object as described above, in the power transmission device is provided with a drive shaft and the driven shaft and the power transmission member for connecting the drive shaft and the driven shaft, the same axis as the drive shaft and formed of the drive shaft A sleeve receiving power: a pulley piece formed coaxially with the drive shaft and spaced apart from the sleeve and transmitting power of the drive shaft to the driven shaft through the power transmission member: when overloaded to the pulley piece, Control means for reducing the outer diameter of the pulley piece to the inside by the inward compression force of the pulley piece, and restoring the pulley piece to the outside by the elastic restoring force when overload is eliminated; And, the cover is provided with a pulley guide groove for guiding the pulley piece when the pulley piece flows, the power transmitted from the drive shaft to match the load applied by appropriately changing the outer diameter of the pulley according to the load applied mechanically The technical gist of the present invention is to provide an automatic transmission pulley, which is characterized by using an efficient transmission without loss of power by transmitting a rotational force.

Here, the control means, the protrusion rib provided on the outer peripheral surface center portion outer surface of the sleeve; A coupling groove provided in plural in the protruding rib; A fixing groove formed inside the pulley piece; One side is pivotally mounted to the coupling groove, and the other side is pivotally mounted to the fixing groove and coupled with the sleeve; A guide protrusion formed at a side of the pulley piece to guide the flow of the pulley piece by flowing along the pulley guide groove of the cover; And an elastic spring fixed to the pulley guide protrusion to provide an elastic force for controlling the reduction / expansion of the pulley piece.

And, the control means, the engaging projection is provided on the outer peripheral surface of the sleeve and the coupling groove is formed; A support protrusion protruding into the pulley piece and having a through hole formed at one side thereof; An elastic spring configured to surround an outer circumferential surface of the support protrusion and compressed when the pulley piece is reduced; A support member fixed to both sides and serving as a support for the elastic spring; One side is pivotally mounted to the coupling groove of the coupling protrusion, and the other side is pivotally mounted to the through hole of the support protrusion to engage with the sleeve when the pulley piece is reduced; In addition, it is also preferably configured to include a guide protrusion formed on the side of the pulley piece to guide the pulley piece by flowing along the pulley guide groove of the cover.

On the other hand, the power transmission device is preferably configured to include; a tension roller for maintaining a constant tension of the power transmission member when the pulley piece is reduced.

Therefore, the present invention is formed so that the outer diameter is automatically changed according to the load applied to the pulley, and when the overload is transmitted, the outer diameter of the pulley piece is automatically reduced by the inward compression force of the pulley piece so that a lot of force is transmitted to smoothly transmit power. When the overload is eliminated, the outer diameter of the pulley piece is restored to the outside by the elastic restoring force to provide a high rotational force, thereby preventing the loss of power and using the power efficiently.

The automatic transmission pulley according to the present invention configured as described above will be described in detail with reference to the drawings.

First Embodiment

3 is a view showing a sleeve according to the first embodiment of the present invention, Figure 4 is a perspective view of an automatic transmission pulley according to the first embodiment of the present invention, Figure 5 is an automatic according to the first embodiment of the present invention An exploded perspective view of the shift pulley.

Hereinafter, the same configuration as the conventional art will be described using the same reference numerals as those shown in FIGS. 1 and 2.

As shown, the automatic transmission pulley is largely composed of a sleeve 100, a pulley piece 200, a control means 300 and a cover 500.

First, the sleeve 100 will be described. The sleeve 100 has a cylindrical shape, a key groove 101 for engaging with the drive shaft 1 is provided inside the sleeve 100, and the drive shaft 1 together with the key 102 in the key groove 101. ) Is coupled to prevent the slim phenomenon of the sleeve 100, the coupling is firm.

In addition, the sleeve 100 is penetrated by the outer surface of the sleeve 100 to one side where the key groove 101 of the sleeve 100 is formed, and the sleeve 100 is connected by bolting when the driving shaft 1 and the sleeve 100 are coupled. The through hole 103 is formed to prevent the separation of the. The sleeve coupled as described above receives power from the drive shaft 1 and transfers power to the pulley piece described later.

On the other hand, the outer peripheral surface of the central portion of the outer surface of the sleeve 100 is formed in a disc-shaped protrusion rib 110, pivotally coupled to the coupling piece 310 to be described later along the outer peripheral surface of the protrusion rib 110 Protruding rib coupling groove 111 is provided with a plurality. In addition, the locking jaw 130 in which the inner cover 501 to be described later is spaced apart from the protruding rib 110 in the longitudinal direction of the sleeve 100 and is integrally formed, and the locking jaw 130 is predetermined. A snap ring fixing groove 120 in which the snap ring 121 for fixing the inner cover 401 is spaced apart is formed, and the outer cover 402 to be described later is spaced apart from the snap ring fixing groove 120. A snap ring fixing groove 120 'is formed to be fixed. The locking jaw 130 and the snap ring fixing grooves 120 and 120 ′ are formed one by one on both sides of the sleeve 100 based on the protruding rib 110.

Next, the pulley piece is demonstrated. The pulley piece 200 is formed in a plurality of annular shape having a predetermined width, at least one groove 201 in which the power transmission member 11 is located on the outer peripheral surface is formed, a predetermined distance from the sleeve 100 And is formed coaxially with the sleeve 100. Here, the pulley piece 200 transmits the power transmitted from the drive shaft 1 to the driven shaft 2 using a power transmission member (v belt, chain, etc.) 11.

In addition, the pulley guide protrusion 210 protrudes from both side surfaces of the pulley piece 200. The pulley guide protrusion 210 is formed to correspond to the pulley guide groove 510 of the inner cover 501, which will be described later, the outer diameter of the pulley piece 200 is reduced by overload, or the pulley guide of the inner cover when restored The flow along the groove 410 smoothly guides the flow of the pulley piece 200.

Next, the control means 300 will be described. The control means 300 is largely composed of a protruding rib 110, a fixing groove 220, a coupling piece 310, a pulley guide protrusion 210, and an elastic spring 320.

First, the protruding ribs 110 are formed in a wing shape along the outer circumferential surface at a substantially outer surface center portion of the sleeve 100 at predetermined intervals. In addition, the protruding rib 110 is provided with a plurality of protruding rib coupling holes 111 to be coupled to one side of the coupling piece 310 to be described later.

On the other hand, the receiving groove 221 is formed inside the pulley piece 200. The receiving groove 221 is provided with a protrusion rib 120 provided in the sleeve 100 when the pulley piece 200 is reduced inward. In addition, the connection groove is formed on the extension line of the receiving groove 221 is provided with a fixing groove 220. The other side of the coupling piece 310 is inserted into and coupled to the fixing groove 220, and penetrated outside the fixing groove 220 and the pulley piece 200 to be coupled to one side of the coupling piece 310. Insertion hole 222 for inserting the pin is formed through.

Next, the coupling piece 310 will be described. The coupling piece 310 has a rod shape having a predetermined width, both ends are circular, and the coupling hole 311 is formed at a predetermined position of both ends. One side of the coupling piece 310 is inserted into the set of the protruding rib 110 provided in the sleeve 100 is pivotally mounted in the coupling rib coupling hole 111 formed in the protruding rib 110. The other side is coupled to the fixing groove 220 inside the pulley piece 200. Here, the coupling piece 310 of the pulley piece 200 by flowing in conjunction with the sleeve 100 in accordance with the load applied to the pulley piece 200 when the overload transfer to the pulley piece 200. Adjust the outer diameter directly.

That is, when an overload is transmitted to the pulley piece 200, the coupling piece 310 coupled with the coupling rib 110 of the sleeve 100 interlocks in the same direction as the rotation direction of the sleeve 100 and the pulley. The piece 200 shrinks inward. At this time, the coupling piece 310 is located in a predetermined space between the set of protruding ribs 110 of the sleeve (100).

Next, the pulley guide protrusion 210 is protruded on both sides of the pulley piece 200, seated in the pulley guide groove 410 of the inner cover 401 to be described later, pulley by flowing along the pulley guide groove Guide the flow of the piece 200, the coupling groove 211 is formed on one side of the pulley guide protrusion 210 to secure one end of the elastic spring 320 to be described later.

Next, the elastic spring 320 is in the form of a coil, one end and the other end is extended to the outside. One end of the elastic spring 320 is fixed to the coupling groove 211 of the pulley guide protrusion 210 of the pulley piece 200, the other end is coupled to the pulley guide protrusion 210 of another pulley piece 200. It is fixed to the groove 211 to provide an elastic force to the pulley piece (200). In addition, the elastic spring 320 is coupled to the outer side of the inner cover 401 after the pulley guide protrusion 210 is coupled with the pulley guide groove 410 of the inner cover 401 to be described later.

The elastic spring 320 restores the pulley piece 200 to the outside by providing an inward compressive force when an overload is transmitted to the pulley piece 200 to reduce the outer diameter and providing an elastic restoring force when the overload is eliminated.

The elastic spring 320 is not limited to the coil shape, and any spring can be applied as long as it provides an elastic force such as a leaf spring.

In addition, the cover 500 provided on both side surfaces of the pulley piece includes an inner cover 401 and an outer cover 402.

First, the inner cover 401 is a disk shape having a predetermined thickness, a circular through hole having a predetermined diameter is formed in the center is the sleeve 100 is located. In addition, the pulley guide groove 410 for guiding the flow of the pulley guide protrusion 210 spaced apart from the through hole of the inner cover 401 is formed through. The pulley guide groove 410 has a predetermined width and length through which the pulley guide protrusion 210 can flow.

In addition, the inner cover 401 is fixed by the locking projection 130 and the snap ring 121 of the sleeve 100, the pulley guide groove corresponding to the pulley guide protrusion 210 of the pulley piece 200. 410 is formed.

Next, the outer cover 402 is formed in the center of the sleeve hole 403, by being coupled to the sleeve 100 is inserted into the sleeve hole 403, is installed in close contact with the outer side of the inner cover 402. In addition, an elastic spring 320 that is coupled to the coupling groove 211 of the pulley guide protrusion 210 is positioned in an inner predetermined space of the outer cover 402 to prevent the elastic spring 320 from flowing and escaping. .

Here, the inner cover 401 and the outer cover 402 are provided on both side surfaces of the pulley piece 200.

The outer diameter of the pulley piece 200 is automatically reduced by the inward compression force of the pulley piece 200 when the overload is transmitted, and the outer diameter is automatically changed according to the load applied to the pulley. When the force is transmitted, the power is smoothly transmitted, and when the overload is eliminated, the outer diameter of the pulley piece 200 is restored to the outside by the elastic restoring force, and a high rotational force is transmitted to prevent the loss of power, and the power is efficiently used. .

Second Embodiment

A shift pulley of a form different from that of the first embodiment will be described in detail below.

Here, the same configuration as in the first embodiment will be described using the same name and the same reference numeral.

Figure 6 is a schematic view showing a power transmission device with an automatic transmission pulley according to a second embodiment of the present invention, Figure 7 is a perspective view of an automatic transmission pulley according to a second embodiment of the present invention, Figure 8 is the present invention 9 is an exploded perspective view of the control means according to the present invention, and FIG. 10 is an operation diagram of the automatic transmission pulley according to the second embodiment of the present invention.

As shown, the automatic transmission pulley according to the second embodiment is largely composed of a sleeve 100 ', a pulley piece 200', a control means 300 ', and a cover 400.

First, the sleeve 100` according to the second embodiment has a cylindrical shape, and a plurality of coupling protrusions 140 to be described later are provided on an outer circumferential surface thereof, and one side of the inner circumferential surface of the sleeve 100` is coupled to the driving shaft 1. A key groove 101 is formed to prevent a slim phenomenon and firmly engage, and a key 102 described later is coupled with the drive shaft. The sleeve 100` coupled as described above receives power from the drive shaft 1 and transmits power to the pulley piece 200` which will be described later.

In addition, the pulley piece 200` has an annular shape having a predetermined width and is divided into a plurality of grooves, and a groove 201 in which the power transmission member 11 is located is formed on an outer circumferential surface thereof, It is spaced apart and formed coaxially with the sleeve 100`. Here, the pulley piece 200` transmits the power transmitted from the drive shaft to the driven shaft 2 using a power transmission member (v belt, chain, etc.) 11.

In addition, a pulley guide protrusion 210 protrudes from the side of the pulley piece 200 ′. The pulley guide protrusion 210 is formed to correspond to the pulley guide groove 410 of the cover 400 to be described later, the outer diameter of the pulley piece 200` is reduced by overload, or the pulley guide groove 410 when restored Flow smoothly to guide the flow of the pulley piece 200`.

Hereinafter, the control means 300 ′ will be described in detail with reference to FIG. 9.

As shown, the control means 300` is largely engaging projection 140, the pulley guide projection 210, the coupling piece 310`, the support projection 310, the elastic spring 320` and , The support member 340.

The coupling protrusion 140 is provided on the outer peripheral surface of the sleeve 100` is provided with a plurality, the coupling groove 141 is pivotally coupled to one side of the coupling piece 310` to be described later.

In addition, a cylindrical support protrusion 330 protrudes to the inner side of the pulley piece 200 ′, and an elastic spring 320 ′ to be described later surrounds the outer circumferential surface of the support protrusion 330. Here, the through hole 331 is formed at one side of the support protrusion 310, and the coupling piece 310 ′ described later is pivotally coupled to the through hole 331 of the support protrusion 330.

In addition, the elastic spring 320 ′ is configured to surround the outer circumferential surface of the support protrusion 330. When the outer diameter of the pulley piece 200` is reduced to the inside by external load transmission, one side is compressed by the inner circumferential surface of the pulley piece 200` as a support and the other side is the outer circumferential surface of the support member 340 as a support. do. When the external load is released, the pulley piece 200 'is restored to the outside by the elastic restoring force of the elastic spring 320' itself.

The coupling piece 310 ′ has a rod shape having a predetermined width, both ends are circular, and a coupling hole 311 is formed at a predetermined position at both ends. One through hole 311 of the coupling piece 310` is pivotally mounted to the coupling groove 141 of the coupling protrusion 140, the other through hole 331 is composed of a pair, the support protrusion 330 The through hole 331 is pivotally mounted into the through hole 331. When the coupling piece 310` is overloaded with the pulley piece 200`, the pulley piece 200` is moved by interlocking with the sleeve 100` according to the outer diameter change of the pulley piece 200`. Adjust the outer diameter of) directly.

That is, when the coupling piece 310` is overloaded with the pulley piece 200`,

The coupling piece 310 coupled with the coupling protrusion 140 of the sleeve 100` is interlocked with the rotation direction of the sleeve 100` so that the pulley piece 200` is reduced inward. At this time, the coupling piece 310` is positioned in a predetermined space between the sleeve 100` and the support protrusion 310.

Next, the supporting member 340 will be described. The support member 340 is formed coaxially with the drive shaft 1 and the elastic spring 320 ′ which provides elastic force and restoring force in the control means 300 ′ is tightly supported to the outside, and covers 400 to be described later. ) And a plurality of cover coupling holes (341) fixedly coupled by bolts. The support member 340 has a curved bar shape having a predetermined width and is formed along the outer circumferential surface of the sleeve 100 ′ at a predetermined distance from the outer circumferential surface of the sleeve 100 ′.

Hereinafter, the cover 400 will be described. The cover 400 has a disk shape having a predetermined thickness, and a circular through hole 420 having a predetermined diameter is formed at a central portion thereof, such that a sleeve 100 ′ coupled to the driving shaft 1 is positioned. A plurality of coupling holes 420 are formed to be spaced apart from the through hole 420 and coupled to the support member 340 by bolting. In addition, at a predetermined position of the cover 400 to guide the flow of the pulley guide protrusion 210 of the pulley piece 200`, a pulley guide groove 510 having a predetermined length is formed through.

Here, the cover 400 is provided with a pair on both sides of the pulley piece 200`. The cover is provided with a pulley guide groove 410, thereby smoothing the flow of the pulley piece 200` by guiding the pulley guide protrusion 210 formed on the pulley piece 200`. In addition, the cover 400 is coupled to the coupling hole 341 of the support member 340 by bolts to fix the pulley piece 200 ′ coaxially with the driving shaft 1.

Then, the tension roller 500 for keeping the tension of the power transmission member 11 constant is installed in close contact with the power transmission member 11. When the overload is transmitted to the pulley piece 200 ′ and the outer diameter of the pulley piece 200 ′ is reduced, the tension of the power transmission member 11 having a certain length is weakened, so that the power transmitted from the drive shaft 1 is driven. ), Or a slim phenomenon such as a belt, which is the power transmission member 11, is compensated for, thereby keeping the tension of the power transmission member 11 constant. Since the tension roller 500 is a known technology, detailed description thereof will be omitted.

The operational effect of the present invention by the above configuration is as described later.

First, in the transmission order of the power, the power transmitted from the drive shaft 1 to the sleeve 100, to the coupling piece 310 to interlock with the sleeve 100`, pivotally coupled to the coupling piece 310 Pulley piece 200, the belt is a power transmission member 11 coupled to the outside of the pulley piece 200 from the pulley piece 200, a chain, or the like, driven shaft (2) in the power transmission member (11) ), Power is transmitted by the above process.

In addition, the elastic force 320 absorbs the load applied to the pulley piece 200 and the impact transmitted from the drive shaft 1 to the sleeve 100 'at the start of the machine, and simultaneously rotates the rotational force of the drive shaft 1 in the sleeve ( 100 is rotated and is pulled simultaneously, a plurality of engaging pieces 310 pivotally coupled to the protruding rib 110 formed integrally on the outer circumferential surface of the sleeve (100). When the coupling piece 310 is pulled as described above, the sleeve 100 and the coupling piece 310 are interlocked. At this time, the coupling piece 310 is located in a predetermined space between a set of coupling ribs 110 protruding from the sleeve 100, the protruding coupling ribs 110 of the pulley piece 200 It is located in the receiving groove 221.

As described above, when one side of the coupling piece 310 pivotally coupled with the sleeve 100 is interlocked with the sleeve 100, the side of the pulley piece 200 coupled to the other side of the coupling piece 310 is formed. The pulley guide protrusion 210 is moved inward along the pulley guide groove 410 provided in the inner cover 401, the outer diameter of the pulley piece 200 is reduced. At this time, the inner compressive force of the pulley piece 200 is applied by the elastic spring fixed to the coupling 211 of the pulley guide protrusion on the outside of the inner cover 401.

As described above, since the outer diameter of the pulley piece 200 is reduced to decrease the rotation radius of the drive shaft 1 and thus has a high gear ratio, a strong rotational force is transmitted to the driven shaft 2.

When the drive is carried out as described above and the rotation is smoothed, the pulley piece 200 which is reduced inward is restored to the outside by the centrifugal force and the elastic restoring force of the elastic spring 320 due to the rotation. When the overload is eliminated as described above, the high speed rotational power is transmitted to the driven shaft 2 because the rotation radius of the drive shaft 1 is increased due to the movement to the outside.

In addition, even when an overload occurs during normal operation starting as described above, the pulley piece 200 is moved as described above to eliminate the overload transmitted to the drive shaft 1.

As described above, according to the automatic transmission pulley power transmission device according to the present invention, the outer diameter is automatically changed in accordance with the load applied to the pulley, and when the overload is transmitted, the outer diameter of the pulley is reduced to increase the gear ratio as the gear ratio increases. The power is transmitted to facilitate the transfer of power, and when the overload is eliminated, the pulley is restored to the outside to provide a high rotational speed to prevent the loss of power, and the power is effectively used.

In addition, the wear of the power source due to overload is prevented, thereby extending the life of the machine.

Claims (4)

In the power transmission device is provided with a drive shaft and a driven shaft, the power transmission member for connecting the drive shaft and the driven shaft, A sleeve formed coaxially with the drive shaft and receiving power of the drive shaft; A pulley piece formed coaxially with the drive shaft and spaced apart from the sleeve and transmitting power of the drive shaft to the driven shaft through the power transmission member; By coupling the sleeve and the pulley piece to transmit the power of the drive shaft transmitted to the sleeve to the pulley piece, when the overload transfer to the pulley piece, by reducing the outer diameter of the pulley piece to the inside by the inward compression force of the pulley piece, overload Control means for restoring the pulley piece to the outside by an elastic restoring force upon dissolution; And And a cover provided with a pulley guide groove for guiding the pulley piece when the pulley piece flows. The method of claim 1, wherein the control means, A protruding rib provided on an outer circumferential surface of a central portion of the outer surface of the sleeve; A coupling groove provided in plural in the protruding rib; A fixing groove formed inside the pulley piece; One side is pivotally mounted to the coupling groove, and the other side is pivotally mounted to the fixing groove and coupled with the sleeve; A guide protrusion formed at a side of the pulley piece to guide the flow of the pulley piece by flowing along the pulley guide groove of the cover; And, And an elastic spring that is fixed to the guide protrusion and provides an elastic force for controlling the reduction / expansion of the pulley piece. The method of claim 1, wherein the control means, A coupling protrusion provided on an outer circumferential surface of the sleeve and having a coupling groove formed therein; A support protrusion protruding into the pulley piece and having a through hole formed at one side thereof; An elastic spring configured to surround an outer circumferential surface of the support protrusion and compressed when the pulley piece is reduced; A support member fixed to both sides and serving as a support for the elastic spring; One side is pivotally mounted to the coupling groove of the coupling protrusion, and the other side is pivotally mounted to the through hole of the support protrusion to engage with the sleeve when the pulley piece is reduced; And, And a guide protrusion formed on the side of the pulley piece to guide the pulley piece by flowing along the pulley guide groove of the cover. The automatic transmission pulley according to any one of claims 1 to 2, wherein the power transmission device includes a tension roller which maintains a constant tension of the power transmission member when the pulley piece is reduced.