WO2021137342A1

WO2021137342A1 - Power transmission device

Info

Publication number: WO2021137342A1
Application number: PCT/KR2020/000132
Authority: WO
Inventors: 박찬구
Original assignee: 위월드 주식회사
Priority date: 2020-01-03
Filing date: 2020-01-03
Publication date: 2021-07-08

Abstract

The present invention relates to a power transmission device having a reduced overall profile of a pulley, which rotates along with a driven shaft by means of a belt or wire, and of wheels or a semi-circular member provided on the outside of the pulley, thereby allowing spatial efficiency to be increased as well as high gear ratio to be attained.

Description

power train

The present invention relates to a power transmission device capable of forming a large gear ratio without increasing the diameter of a pulley.

The power transmission device is configured to transmit the rotational force from the main shaft rotating while forming the axis of the power source to the driven shaft forming the axis of the device to be rotated. Generally, depending on the state of the two shafts or the shape of the teeth, Spur gear, internal gear, rack, helical gear, bevel gear, screw gear, worm gear and two shafts It is classified as a pulley that transmits power by hanging a rope or a belt that surrounds the shaft spaced apart from each other. At this time, in the case of a worm gear in which the two shafts rotate orthogonally, there are various types of differential devices that require a high reduction ratio and antenna elevation drive devices, etc. is being used extensively.

However, in the conventional power transmission device as described above, in order to achieve a high gear ratio, the diameter of the driven shaft due to the number of threads formed along the outer circumferential surface, that is, the teeth of the interlocking threads (gear teeth, 治) must be increased, Accordingly, there is a limitation that the overall height (Profile) of the mechanism in which the power transmission device is installed is formed to be high.

The present invention has been devised to solve the above problems, and an object of the present invention is to provide a power transmission device that is installed to form a high gear ratio in a limited space as the overall height (profile) is reduced.

The present invention relates to a pulley having an outer circumferential surface formed at a predetermined angle, a power transmission member that is provided to surround the outer circumferential surface of the driven shaft and the pulley, and a power transmission member that transmits the rotational force of the driven shaft, and is provided on the radially outer side of the pulley to face each other It relates to a power transmission device including a pair of locking ends each surrounding the power transmission member, and a pulley for parallel rotation with a driven shaft using a belt or wire, a pulley or a half-moon member provided on the outside of the pulley. By reducing the height, it is possible to increase the spatial efficiency and at the same time form a high gear ratio.

The present invention according to the above configuration increases spatial efficiency by reducing the overall height formed by a pulley that parallels rotation with a driven shaft using a belt or wire, a pulley or a half-moon member provided on the outside of the pulley, and at the same time, a high gear ratio has the advantage of being able to form

1 is a view showing a power transmission device according to a first embodiment of the present invention.

Figure 2 is an exemplary view for explaining the rotation radius of the power transmission device of the present invention according to the pulley forming the outer peripheral surface of various angles.

3 and 4 are views showing a modified example of the power transmission device according to the first embodiment of the present invention.

5 and 6 are views showing a power transmission device according to a third embodiment of the present invention.

7 and 8 are views showing a power transmission device according to a 1-1 embodiment of the present invention.

9 is a view showing a power transmission device according to a 1-2 embodiment of the present invention.

10 is a view showing a power transmission device according to a 2-1 embodiment of the present invention.

11 is a view showing a power transmission device according to a second embodiment of the present invention.

In order to solve the above problems, the present invention relates to a power transmission device for transmitting power from a driving shaft rotating by receiving power to a driven shaft rotating by receiving the power of the driving shaft, the first aspect of the present invention The power transmission device according to the first embodiment includes a pulley having an outer circumferential surface forming a predetermined angle, a power transmission member configured to surround an outer circumferential surface of the driving shaft and the pulley, and a power transmission member transmitting a rotational force of the driving shaft, and a radially outer side of the pulley It is provided in, characterized in that it comprises a driven portion forming a pair of engaging ends each surrounding the power transmission member in opposite directions.

In addition, the power transmission member is characterized in that it is provided to surround the outer peripheral surface of the driving shaft and the driven part on one side in the thickness direction, and to surround the outer peripheral surface of the pulley on the other side.

In addition, the pair of engaging ends of the driven part form a straight line in the opposite direction, and the power transmission member surrounds any one of the engaging ends provided in the opposite direction to the opposite direction of the one end surrounding the driving shaft, the It is characterized in that it is configured to surround the outer peripheral surface of the pulley.

In addition, the pair of engaging ends of the driven part is characterized in that it is configured to achieve different heights in the axial direction of the pulley.

In addition, the pulley and the driven part is characterized in that it is made to rotate in parallel with the driven shaft.

In addition, the driven part is made to rotate in parallel with the driven shaft, the pulley is characterized in that it is fixed to be independent of the driven part.

In addition, the pulley is provided so as to be spaced apart a predetermined distance outward in a radial direction of the first pulley and a first pulley forming a partially hollow opening on the outer circumferential surface, and a second pulley forming an opening in the same direction as the first pulley. The driven part is interposed between the first pulley and the second pulley, and the power transmission member surrounds the driving shaft and the driven part on one side in the thickness direction, and on the plurality of pulleys on the other side. It is characterized in that it is configured to surround the outer peripheral surface.

In addition, the first driven part and the second driven part is characterized in that it is provided on the same plane forming a concentric circle with the pulley.

In addition, the driven part forms a plurality of engaging ends provided to protrude in a direction perpendicular to the outer circumferential direction of the pulley, and the power transmission member alternates the outer surfaces of the plurality of engaging ends in the circumferential direction of the pulley. And characterized in that it is configured to wrap.

In addition, the pulley forms a concentric circle with the driven shaft, and is made to rotate in parallel with the driven shaft, characterized in that the driven part is fixed so as to rotate in parallel with the pulley.

In addition, a plurality of fixed rollers spaced apart from each other by a predetermined distance in the radial direction of the pulley and provided to be symmetrical to each other with respect to the driven shaft, corresponding to the number of the driven parts adjacent in the axial direction of the driven shaft, are further added. Including, wherein the power transmission member is characterized in that it wraps alternately the plurality of fixed rollers and the engaging end provided in the same direction with respect to the driven shaft.

In addition, the power transmission device according to the second embodiment of the present invention is provided so as to surround the outer peripheral surface of the pulley, the driving shaft, and the outer peripheral surface of the pulley having an outer peripheral surface forming a predetermined angle, the power transmission member for transmitting the rotational force of the driving shaft and a driven part provided on the radially outer side of the pulley to form a pair of engaging ends respectively surrounding the power transmission member in opposite directions, wherein the power transmission member has a plurality of threads formed inward. It is made of, it is provided so as to surround the outer peripheral surface of the driving shaft, the pair of engaging ends and the pulley to the inside, the outer peripheral surface of the pulley is characterized in that a plurality of threads engaged with the inner side of the power transmission member is formed.

In addition, the pulley is made to rotate in parallel with the driven shaft, the driven part is characterized in that it is fixed to be independent of the pulley.

Since the present invention can have various changes and can have various embodiments, specific embodiments are illustrated in the drawings and detailed description will be given. However, this is not intended to limit the present invention to specific embodiments, and it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention.

When a component is referred to as being “connected” or “connected” to another component, it may be directly connected or connected to the other component, but it is understood that other components may exist in between. it should be

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Terms such as those defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. does not

Hereinafter, the technical idea of the present invention will be described in more detail with reference to the accompanying drawings.

Since the accompanying drawings are merely examples shown to explain the technical idea of the present invention in more detail, the technical idea of the present invention is not limited to the form of the accompanying drawings.

< 제1실시예 : 동력전달부재 - 한 쌍의 걸림단에 따른 동력전달 ><Embodiment 1 : Power transmission member - Power transmission according to a pair of engaging ends >

FIG. 1 is a view showing a power transmission device according to a first embodiment of the present invention. Referring to FIG. 1 , the present invention is from a driving shaft 10 that rotates with power applied to the driving shaft 10 . To a power transmission device for transmitting power to a driven shaft 20 that rotates by receiving power, the power transmission device 1000 according to the first embodiment of the present invention includes a pulley 100 having an outer circumferential surface forming a predetermined angle. ), the power transmission member 200 and the pulley 100 provided to surround the outer peripheral surfaces of the driving shaft 10 and the pulley 100 to transmit the rotational force of the driving shaft 10 and the pulley 100 in the radial direction. It may be provided in and may be configured to include a driven part 300 forming a pair of engaging ends 310 each surrounding the power transmission member 200 in opposite directions.

At this time, the power transmission member 200 is configured to surround the outer peripheral surface of the driving shaft 10 and the driven part 300 on one side in the thickness direction, and surround the outer peripheral surface of the pulley 100 on the other side, the driven shaft ( 20) and the driven part 300 made to rotate in parallel with the driven part 300 is configured to be independent from the driven part 300 and rotates along the outer peripheral surface of the fixed pulley 100, thereby converting the rotational force of the driven shaft 10 to the driven shaft 20, or the pulley 100 and the driven part 300 are configured to rotate in parallel with the driven shaft 20, and the pulley 100, the driven part by the rotational force of the driven shaft 10 300 and the driven shaft 20 or a motor coupled to the driven shaft 10 may be configured to rotate.

Here, the power transmission member 200 is each wound on the pair of locking ends 310 and is configured to transmit power to the pair of locking ends 310 by rotation of the driving shaft 10 . As a result, it may be formed of a belt, a wire, a rope, etc. which form a closed loop and are wound to respectively surround the pair of locking ends 310 . At this time, the pair of locking ends 310 are provided on the radially outer side of the pulley 100 and form a pair of pulleys 301 spaced apart from each other by a predetermined distance in a straight line or a predetermined thickness of the pulley 100 . It is composed of a half-moon member 302 that surrounds the outer circumferential surface, and forms an opening 320 communicating with a predetermined length in the radial direction of the pulley 100, so that the power transmission member 200 is the pair of pulleys 301 . Between the spaced apart and passing through the opening 320 of the half-moon member 302 may be formed to surround each of the engaging ends 310. At this time, the driving shaft 100 is a supply/recovery roller capable of winding or unwinding the power transmission member 200 or a gear and a pulley that engages with the power transmission member 200 when the timing belt is formed and transmits power. can be configured.

In more detail, the length of one side of the power transmission member 200 drawn out from the driving shaft 10 and surrounding the outer circumferential surface of the pulley 100 and wound around any one of the pair of engaging ends 310 gradually increases. When the driving shaft 10 rotates to be shorter, the pair of locking ends 310 fixed to rotate in parallel with each other rotate in a counterclockwise direction in the direction looking at FIG. 1 with respect to the pulley. do. At this time, the torque (T) in the driven shaft (20) according to the rotational force (f) of the driven shaft is applied to the linear distance (L) from the driven shaft to the engaging end (310) and the engaging end (310) The product of the rotational force (F) in the orthogonal direction (

), and at this time, the rotational force F in the orthogonal direction acting on the engaging end 310 is the power transmission member 200 acting in the contact surface direction between the engaging end 310 and the pulley 100. It is proportional to the rotational force (f*cos(c)) of the motor shaft 10 that is recovered. That is, the rotational force (torque, T) acting on the driving shaft is based on Equation 1 below, wherein the tangent angle c is in the range of 0 < c < 1/2∏, and the It is determined by the distance (t) the engaging end 310 is spaced from the outer peripheral surface.

Equation 1:

Hereinafter, in the power transmission device 1000 according to an embodiment of the present invention, a configuration in which the driven part 300 constituting the locking end 310 rotates will be described as an example, but the power transmission device 1000 of the present invention The fixed relationship of the pulley 100 and the driven part 300 according to the rotation of the pulley 100 may be variously modified without departing from the gist of the present invention unless a specific limiting phrase or configuration is mentioned.

FIG. 2 is an exemplary view for explaining the rotation radius of the power transmission device of the present invention according to a pulley whose outer circumferential surface forms various angles. Referring to FIG. 2 , the power transmission device 1000 of the present invention is the driven shaft 20 of FIG. The rotation radius is determined by the rotation angle (b) formed by the outer peripheral surface of the pulley 100 . That is, the power transmission device 1000 has an advantage that it can be efficiently designed according to the gear ratio and space required for the device by limiting the rotation angle b formed by the outer circumferential surface of the pulley 100 . At this time, the pair of engaging ends 310 moving in parallel along the outer circumferential surface of the pulley 100 are spaced apart by a predetermined distance in a direction facing each other, and at this time, the pair of engaging ends 310 from the driven shaft 20 . ), the rotation radius of the driven shaft 20 is limited by the non-rotational angle (a) formed according to the spaced distance. (That is, the rotation radius of the driven shaft 20 is the rotation angle (b) formed by the outer circumferential surface of the pulley 100 - the non-rotation angle (a) according to the distance the pair of engaging ends 310 are spaced apart. will be achieved.)

3 is a configuration diagram showing a modified example of the power transmission device according to the first embodiment of the present invention, FIG. 4 (a) is a rear view according to FIG. 3, and FIG. 4 (b) is FIG. 3 and 4, the rotation radius of the driven shaft 20 by the non-rotation angle (a) according to the distance at which the pair of locking ends 310 is coupled is limited. In order to overcome the limitation, the power transmission device 1000 of the present invention is configured such that the power transmission member 200 is twisted at least one time to surround the pulley 100 to limit the rotation radius of the driven part 300 . It may be configured to rotate more than 360 degrees without doing so.

In more detail, the power transmission member 200 of the pulley 100 so that one end 210 surrounding the driving shaft 10 surrounds any one of the engaging ends 310 provided in the opposite direction facing each other. After wrapping the outer circumferential surface, the one of the locking ends 310 is wrapped around the outer circumferential surface of the pulley 100 again to wrap around the other locking end 310 is wound. At this time, the pair of engaging ends 310 of the driven part 300 are configured to have different heights in the axial direction of the pulley 100 , and interference between the power transmission members 200 surrounding the pulley 100 . can be minimized.

At this time, the power transmission device 1000 of the present invention maintains the tension of the power transmission member 200 by using a plurality of idle rollers for preventing unnecessary contact between the power transmission members 200 and at the same time It may be configured to prevent friction between the power transmission members 200 .

More specifically, the power transmission member 1000 according to the above-described configuration may be deformed using various coupling and fixing means suitable for the device to be applied without departing from the gist of the present invention, in which case the driven part 300 ) is a fixing means for connecting with the driven shaft 20 so that the pair of locking ends 310 are rotated, including the pair of locking ends 310, or the pair of locking ends according to the gist of the present invention. The stage 310 may be made through a separate fixing means that is independently fixed to the driven shaft 20, and as shown in FIGS. 5 and 6, the driven part 300 has one side of the driven shaft ( 20) and is fixed to rotate in parallel, the other end may be formed of a rocker arm extending to have a predetermined length L outward in the radial direction of the driven shaft, wherein the rocker arm 300 transmits the power to the other side The member 200 further includes a pair of fixed ends 310 on which each is wound, wherein the power transmission member 200 includes the driving shaft 10 and the pair of fixed ends 310 to one side in the thickness direction. It is configured to wrap, and it is possible to form the power transmission member 1000 of the present invention according to the first embodiment described above.

At this time, the pulley 100 forms an outer circumferential surface forming a predetermined angle, and is formed to have a downwardly curved shape so that the upper surface has a predetermined curvature, and the power transmission member passing through the pair of fixed ends 310 ( 200) is formed to surround the outer surface, it is possible to further reduce the overall height of the device according to the diameter of the pulley (100). That is, the driven shaft 20 does not form a concentric axis with the pulley 100 , but is formed to be radially spaced apart from the centrifugal axis of the pulley 100 , so that the limit according to the radius formed by the pulley 100 when designing the pulley 100 . can overcome That is, the pulley 100 in the power transmission member 1000 of the present invention constituting the above-described configuration has the power transmission member 200 fastened to the driving shaft 10 to engage the pair of engaging ends 310 . It may be transformed into various configurations to form a guide for rotating the pair of locking ends 310 .

At this time, the outer peripheral surface of the pulley 100 is formed to surround a part of the outer peripheral surface of the pulley 100 , and further comprising a fixed gear formed to press the power transmission member on the outer peripheral surface opposite to the pulley 100 . It is possible to maintain the tension of the power transmission member 200 surrounding the power transmission member 200 and prevent the separation of the power transmission member 200 .

In addition, a pair of fixed ends 510 respectively provided outside the pair of locking ends 310 are formed on the other side of the rocker arm 300 to surround the upper side of the driven shaft 20 , and the A slip belt 500 having both ends fixed to a pair of fixed ends 510 of the rocker arm 300 so as to press the driven shaft 20 downwardly and interposed inside the power transmission member 200 in contact with each other. ) by further including, it is possible to prevent interference between the power transmission member 200 .

< 제1-1실시예 : 기어비 증가를 위한 수직방향 배치구조 ><Example 1-1: Vertical arrangement structure for increasing gear ratio>

7 is an exploded perspective view showing the power transmission device 1000 showing the 1-1 embodiment of the present invention, and FIG. 8 is the power transmission device 1000 showing the 1-1 embodiment of the present invention. As a cross-sectional view, referring to FIGS. 7 and 8 , the power transmission device 1000 according to the 1-1 embodiment of the present invention includes a pulley 100 having an outer circumferential surface formed at a predetermined angle, the driving shaft and the The power transmission member 200 provided to surround the outer circumferential surface of the pulley, transmitting the rotational force of the driving shaft, and a pair of engaging members provided on the radially outer side of the pulley to respectively surround the power transmission member in opposite directions It may be configured to include a driven part 300 forming a stage, a lower plate 50 to which the pulley 100 is fixed upward, and an upper plate 40 fastened to cover the lower plate 50 .

At this time, the pulley 100 is provided so as to be spaced a predetermined distance apart from the first pulley 110 and the first pulley 110 radially outward of the first pulley 110 forming a partly hollow opening 111 on the outer circumferential surface, the first A plurality of second pulleys 120 that form an opening 121 in the same direction as the pulley 110 are formed, and the driven part 300 includes the first pulley 110 and the second pulley 120 . At least one may be provided in a direction (radial direction) perpendicular to the driven shaft, including the first driven part 312 interposed therebetween. At this time, the power transmission member 200 is preferably configured to surround the driving shaft 10 and the driven part 300 on one side in the thickness direction, and surround the outer peripheral surface of the plurality of pulleys 100 on the other side.

Accordingly, the rotational force (f) of the driven shaft (10) is a plurality of driven parts (312, 322) interposed between the plurality of pulleys (110, 120, 130) disposed in the radial direction of the driven shaft (20) , 332 is applied to the engaging ends 310a, 310b, 310c formed in the

openings

312a, 322a, 332a, respectively, and the gear ratio is increased as the rotation of the driven shaft 20 is decelerated. At this time, the torque T in the driven shaft 20 of the power transmission device 1000 according to the 1-1 embodiment of the present invention is proportional to Equation 2 below.

Equation 2:

Here, the force (F) applied to each of the engaging ends (310a, 310b, 310c) is inversely proportional to the distance (L) from the driven shaft (20) to each of the engaging ends (310a, 310b, 310c) , the first pulley 110 , the first driven part 312 , the second pulley 120 , and the second driven part 322 in which the power transmission member 200 is disposed in a straight line, respectively, are caught in the order By being alternately wound on the stage 310 , the rotation applied to the driven shaft 20 is reduced.

In addition, the plurality of driven parts (312, 322, 332) is preferably provided on the same plane forming a concentric circle with the pulley 100, in this case, the plurality of pulleys (110, 120, 130) and the driven part ( For assembling the power transmission member 200 that alternately wraps 312, 322, and 332, the plurality of

pulleys

110, 120, and 130 are fixed to the lower plate 50, and the plurality of driven

parts

312, 322 and 332 are formed downwardly on the upper plate 40, whereby the plurality of driven

parts

312, 322, 332 are formed by the rotation of the power transmission member 200 of the

pulleys

110, 120, and 130. Rotation is performed along the circumferential direction, and at this time, the driving shaft 20 is independent of the lower plate 50 and the pulley 100, and the upper plate is rotated in parallel with the plurality of driven

parts

312 , 322 , 332 . It is preferably fixed at (40).

< 제1-2실시예 : 기어비 증가를 위한 수평방향 배치구조 ><Embodiment 1-2: Horizontal arrangement structure for increasing gear ratio>

9 is a view showing a power transmission device according to a 1-2 embodiment of the present invention. In the power transmission device 1000 according to a 1-2 embodiment of the present invention, the driven part 300 includes the pulley. A plurality of locking ends 310 provided to protrude in a direction perpendicular to the outer circumferential direction of 100 are formed, and the power transmission member 200 includes the plurality of locking ends 310 in the circumferential direction of the pulley 100 ( 310) is characterized in that it is configured to alternately wrap the outer circumferential surface. That is, the power transmission member 200 that transmits the rotational force of the driving shaft 10 is wound around the driven part 300 and operates to pivotally rotate the pulley 100 . At this time, the driving shaft 200 is spaced apart from each other in the radial direction of the pulley 100 so that one side of the power transmission member 200 surrounds the outer peripheral surfaces of the driving shaft 10 and the pulley 100 . have.

That is, as shown in FIG. 9 , in the power transmission device 1000 according to the 1-2 embodiment of the present invention, the pulley 100 forms a concentric circle with the driven shaft 20, and the driven shaft 20 ) and rotation in parallel, the driven part 300 is fixed to rotate in parallel with the pulley 100, and may be formed to transmit the rotational force of the driven shaft 10 to the driven shaft 20 have. At this time, the power transmission device 1000 is provided to be symmetrically spaced apart from each other by a predetermined distance outward in the radial direction of the pulley 100 , and is adjacent to the driven shaft 20 in the axial direction. Further comprising a plurality of fixed rollers 351 provided corresponding to the number of the engaging ends 310, the power transmission member 200 is provided in the same direction with respect to the driven shaft 20, the plurality of Alternately wraps the fixed roller 351 and the engaging end 310 of the pulley 100, and then wraps around the outer peripheral surface of the pulley 100 to surround the plurality of fixed rollers 351 and the engaging end 310 provided on the opposite side of the driving shaft ( 10) may be configured to be coupled to.

In more detail, the plurality of fixed rollers 351 are spaced apart from each other by a predetermined distance in the radial direction of the pulley 100 to be fixedly installed on the idler 350 provided to be symmetrical with each other with respect to the driven shaft 20 . In addition, the idler 350 is preferably formed to be fixed at a predetermined position independently of the pulley and the driven part 300 . At this time, the power transmission member 200 drawn out from the driven shaft 10 has any one fixed roller 351a on any one idler 350 provided on one side in the radial direction of the driven shaft 20 . After wrapping, any one of the locking ends 310b of the plurality of locking ends 310 of the pulley 100 provided at a position corresponding to the one fixed roller 351a is wrapped, and again the one fixed roller 351a ) from the other fixed roller 351c provided to be spaced apart by a predetermined distance in the axial direction of the driven shaft 20 - on the outer peripheral surface of the pulley 100 at a position corresponding to the other fixed roller 351c After wrapping the other locking end 310d provided, the locking end 310e-fixing roller 351f-locking end wrapped around the outer circumferential surface of the pulley 100 and provided on the other side in the radial direction of the driven shaft 20 (310g) - After wrapping in the order of the fixed roller (351h), it is coupled to the driving shaft (20). Accordingly, the rotational force f of the driven shaft 10 is applied to the plurality of engaging ends 310 disposed in the radial direction of the pulley 100, respectively, and a pulley formed to rotate in parallel with the driven shaft 20 ( 100), the gear ratio increases as the rotation decelerates.

< 제2실시예 : 타이밍벨트 - 풀리에 따른 동력전달 >< Second embodiment: Timing belt - Power transmission according to the pulley >

In the power transmission device 2000 according to the second embodiment of the present invention, the power transmission member 200 is formed of a timing belt having gear teeth (hereinafter referred to as a thread) formed therein, and the pulley 100 has an outer circumferential surface. A screw thread engaged with the power transmission member 200 made of the timing belt is formed on the top, thereby forming a configuration for transmitting power according to the rotation of the driven shaft 10 to the driven shaft 20 . Hereinafter, the power transmission device 2000 according to the second embodiment of the present invention according to the power transmission method of the above-described configuration will be classified and described.

< 제2-1실시예 : 타이밍벨트를 이용한 풀리 회전구동에 따른 동력전달 ><Embodiment 2-1: Power transmission according to rotational driving of pulley using timing belt>

10 is a view showing a power transmission device according to a 2-1 embodiment of the present invention. Referring to FIG. 9 , the power transmission device 2000 according to a 2-1 embodiment of the present invention is angled at a predetermined angle. A power transmission member 200 and the pulley provided to surround the outer peripheral surface of the pulley 100, the driving shaft 10 and the pulley 100 having an outer peripheral surface formed therein, and transmitting the rotational force of the driving shaft 10, and the pulley ( It is provided on the radially outer side of 100) and includes a driven part 300 forming a pair of engaging ends 310 each surrounding the power transmission member 200 in opposite directions, and the power transmission member ( 200) is made of a belt having a plurality of threads formed on the inside, it is characterized in that it is provided so as to surround the outer peripheral surface of the driving shaft 10, a pair of locking ends 310 and the pulley 100 to the inside. At this time, the pulley 100 is made to rotate in parallel with the driven shaft 20, the driven part 300 is fixed to be independent of the pulley 100, and the driven shaft 10 is the pulley ( 100), maintaining a high gear ratio, and has the advantage of reducing the overall height (L) of the power transmission device (2000).

< 제2-2실시예 : 타이밍벨트를 이용한 피동부 회전구동에 따른 동력전달 ><Embodiment 2-2: Power transmission according to rotational driving of a driven part using a timing belt>

11 is a view showing a power transmission device according to a 2-2 embodiment of the present invention. Referring to FIG. 11 , the power transmission device 2000 according to a 2-2 embodiment of the present invention is the driven part ( 300) is made to rotate in parallel with the driven shaft 20, the pulley 100 is characterized in that it is fixed to perform independent rotation with the driven part (300).

In more detail, the rotational force f of the driving shaft 10 is transmitted to the pulley 100 fixed through the power transmission member 200, and the power transmission member 200 and the pulley 100 are engaged with the A reaction force according to the rotational force f is transmitted in a tangential direction between the engaging end 310 and the pulley 100 . At this time, the reaction force (

) is proportional to the gear ratio of the driving shaft 10 and the pulley 100 . That is, the torque T in the driven shaft 20 according to the rotational force f of the driven shaft is the linear distance L from the driven shaft 20 to the engaging end 310 and the engaging end ( 310) is the product of the rotational force (F) in the orthogonal direction (

), and at this time, the rotational force F in the orthogonal direction applied to the engaging end 310 is the power transmission member 200 acting in the direction of contact between the engaging end 310 and the pulley 100 . is proportional to the reaction force (f*(D/d)*cos(c)) of That is, the rotational force (torque, T) acting on the driving shaft is caused by the following Equation 3, wherein the tangent angle c is in the range of 0 < c < 1/2∏, and the It is determined by the distance (t) the engaging end 310 is spaced from the outer peripheral surface.

Equation 3:

At this time, as shown in (b) of FIG. 10, cos(c) according to the tangent angle c of the engaging end 310 and the pulley 100 is proportional to t/(D+d), Equation 3 to which this is applied can be expressed as Equation 4 below, that is, in the power transmission device 2000 according to the 2-2 embodiment of the present invention, the pair of locking ends 310 from the pulley 100 form It is possible to form an increased gear ratio in proportion to the linear distance (t).

Equation 4:

The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention as claimed in the claims.

Claims

In the power transmission device for transmitting power from the main shaft rotating by receiving power, to the driven shaft rotating by receiving the power of the main shaft,

a pulley having an outer circumferential surface forming a predetermined angle;

a power transmission member provided to surround the outer peripheral surfaces of the driving shaft and the pulley, and transmitting the rotational force of the driving shaft; and

a driven part provided on the radially outer side of the pulley to form a pair of engaging ends respectively surrounding the power transmission member in opposite directions;

Power transmission device comprising a.
According to claim 1,

The power transmission member,

The power transmission device, characterized in that it is provided to surround the outer peripheral surface of the driving shaft and the driven part on one side in the thickness direction, and to surround the outer peripheral surface of the pulley on the other side.
3. The method of claim 2,

A pair of engaging ends of the driven part form a straight line in the opposite direction,

The power transmission member is configured to surround the outer circumferential surface of the pulley so that one end surrounding the driving shaft surrounds any one of the engaging ends provided in the opposite direction to the opposite direction.
4. The method of claim 3,

The pair of engaging ends of the driven part are configured to have different heights in the axial direction of the pulley.
3. The method of claim 2,

the unwinding,

A first pulley partially forming a hollow opening on the outer circumferential surface, and

a second pulley provided to be spaced apart by a predetermined distance outward in the radial direction of the first pulley, the second pulley forming an opening in the same direction as the first pulley;

Consists of a plural comprising

The driven part is interposed between the first pulley and the second pulley,

The power transmission member is configured to surround the driving shaft and the driven part to one side in the thickness direction, and to surround the outer circumferential surface of the plurality of pulleys to the other side.
According to claim 1,

The driven part forms a plurality of engaging ends provided to protrude in a direction perpendicular to the outer circumferential direction of the pulley,

The power transmission member is a power transmission device, characterized in that configured to alternately surround the outer surface of the plurality of engaging ends in the circumferential direction of the pulley.
7. The method of claim 6,

a plurality of fixed rollers spaced apart from each other by a predetermined distance in the radial direction of the pulley to be symmetrical to each other with respect to the driven shaft, and provided to correspond to the number of the driven parts adjacent in the axial direction of the driven shaft;

further comprising,

The power transmission member alternately surrounds the plurality of fixed rollers and the engaging end provided in the same direction with respect to the driven shaft.
According to claim 1,

The power transmission member is made of a belt having a plurality of threads formed on the inside, and is provided to surround the outer circumferential surface of the driving shaft, a pair of locking ends and the pulley inwardly,

Power transmission device, characterized in that the outer peripheral surface of the pulley is formed with a plurality of threads engaged with the inner side of the power transmission member.