Abstract:
A torque-transmitting device uses the principle of leverage in such a way that torque input at one end of a lever can become a greater torque per unit time at the other end of the lever, and can be achieved in a uniform fashion. The torque-transmitting device of the present invention comprises: a drive motor; a first mounting unit for rotatably mounting a rotational drive body which rotates on receiving a drive force from the drive motor; a second mounting unit provided at a predetermined distance from the first mounting unit; a lever which is rotatably secured on a support member provided between the first mounting unit and the second mounting unit, and of which one end is mounted on the first mounting unit where it turns as it is driven by the drive motor and of which the other end is mounted on the second mounting unit where it turns; an actuator which is linked to the other end of the lever and performs a linear reciprocating motion as the lever turns in the top-to-bottom direction; and a torque device for converting the linear reciprocating motion of the actuator into a rotational motion and generating torque for driving a predetermined loading device.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    The present invention relates to a torque-transmitting device, and more particularly, to a torque-transmitting device using a lever, which can increase torque using the principle of the lever. 
         [0002]    In general, levers have been widely used in various fields in modern society because the levers have a merit that they can gain a greater force with a small force in such a fashion that a bar turns on a predetermined position when a user applies force to an end portion of the bar. 
         [0003]    Such levers have the fulcrum formed at the center of the turning lever, the force point where force is applied, and the point of action of the force applied at the end portion of the bar to an object. 
         [0004]    The levers are classified into a first class lever in which the fulcrum is located between the force point and the point of action, a second class lever in which the point of action is located between the fulcrum and the force point, and a third class lever in which the force point is located between the fulcrum and the point of action. 
         [0005]    An efficiency of force using the lever is decided depending upon a ratio of a magnitude of force, which is applied to the force point, to an operation distance of the bar and a ratio of a distance between the fulcrum and the point of force to a distance between the fulcrum and the point of action. 
         [0006]    In order to apply force to an object using the principle of the lever, a linear directional force is applied to an end portion of the bar to move the position of the force point, and then, the position of the bar corresponding to the point of action is also changed and at the same time, the movement distance of the bar is also reduced, and hence, at the point of action, the lever can produce a greater force than the force applied to the force point. 
         [0007]    Such a principle of the lever has been used through various types of modification in daily life and in industrial sites, but has not yet been used for a purpose to generate a strong torque at an output side by transmitting torque and amplifying torque. 
       SUMMARY OF THE INVENTION 
       [0008]    Accordingly, the present invention has been made in an effort to solve the above-mentioned problems occurring in the prior arts, and it is an object of the present invention to provide a torque-transmitting device, which can convert torque input at one end portion of a lever into a greater force at the other end portion of the lever using the principle of lever to thereby gain a great rate of production. 
         [0009]    To achieve the above objects, the present invention provides a torque-transmitting device including: a driving motor; a first mounting part having a driving rotor rotatably mounted, the driving rotor rotating by receiving a driving force from the driving motor; a second mounting part spaced apart from the first mounting part at a predetermined interval; a lever rotatably fixed on a support member disposed between the first mounting part and the second mounting part, the lever having one end portion mounted on the first mounting part and being rotated by the driving motor and the other end portion rotatably mounted on the second mounting part; an actuator connected with the other end portion of the lever in such a fashion as to do a rectilinear reciprocating motion as the lever rotates vertically; and a torque device adapted for converting the rectilinear reciprocating motion of the actuator into a rotary motion to thereby generate torque to operate a predetermined loaded device. 
         [0010]    Moreover, preferably, the torque device includes: a first clutch that drivingly rotates relative to the rectilinear motion of the actuator in one direction but idly rotates relative to the rectilinear motion of the actuator in the opposite direction; and a second clutch that idly rotates relative to the rectilinear motion of the actuator in one direction but drivingly rotates relative to the rectilinear motion of the actuator in the opposite direction. 
         [0011]    Furthermore, it is preferable that the torque device further includes: a first shaft rotating as a main shaft of the first clutch and providing a driving force to a loaded device; and a second shaft rotating as a main shaft of the second clutch and generating torque to be transmitted to the first shaft. 
         [0012]    Additionally, the torque device further includes: a first driving gear rotatably connected to the first shaft; a second driving gear rotatably connected to the second shaft; and a connection member connected to the first driving gear and the second driving gear in such a fashion that the first driving gear and the second driving gear transmit the driving force mutually to rotate in the same direction, the connection member transmitting the torque of the second shaft to the first shaft. 
         [0013]    In addition, the actuator includes: a first rack gear part that is disposed on one side of the actuator in such a way as to interlock the first clutch, the first rack gear part drivingly or idly rotating the first clutch according to a rectilinear reciprocating motion; and a second rack gear part that is disposed on the other side of the actuator in such a way as to interlock the second clutch, the second rack gear part drivingly or idly rotating the second clutch according to a rectilinear reciprocating motion. 
         [0014]    Moreover, the torque-transmitting device further includes: laterally movable roller units respectively disposed at one end portion and the other end portion of the lever and moving in a lateral direction when the lever is rotated to thereby guide a motion of the lever; and vertically movable roller units mounted on the same axis as the laterally movable roller units and moving in a vertical direction when the lever is rotated to thereby guide the motion of the lever. 
         [0015]    Furthermore, each of the laterally movable roller units and the vertically movable roller units includes: a first plate; a second plate spaced apart from the first plate at a predetermined interval and opposed to the first plate; and a plurality of rollers disposed between the first plate and the second plate, respectively rotatably mounted on a plurality of rotary centers, which are spaced apart from each other at predetermined intervals and arranged in parallel, the rollers protruding to one side and the other side of the first plate and the second plate. 
         [0016]    The torque-transmitting device according to the present invention can convert torque input at one end portion of a lever into a greater force at the other end portion of the lever using the principle of lever to thereby gain a great rate of production. 
     
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         [0017]      FIG. 1  is a perspective view of a torque-transmitting device according to a first preferred embodiment of the present invention. 
           [0018]      FIG. 2  is a perspective view concretely showing hidden parts of the torque-transmitting device of  FIG. 1 , from which some parts of the torque-transmitting device are omitted. 
           [0019]      FIG. 3  is an exploded perspective view concretely showing a lever and the torque-transmitting device of  FIG. 1 . 
           [0020]      FIGS. 4 and 5  are views showing operations of the torque-transmitting device of  FIG. 1 , wherein  FIG. 4  illustrates an operation when one end portion of the lever goes down and  FIG. 5  illustrates an operation of the torque-transmitting device in the condition of  FIG. 4 . 
           [0021]      FIG. 6  is a view showing an operation of the torque-transmitting device of  FIG. 1  when the end portion of the lever goes up. 
           [0022]      FIG. 7  is a view showing an operation of the torque-transmitting device in the condition illustrated in  FIG. 6 . 
           [0023]      FIG. 8  is a perspective view of a torque-transmitting device according to a second preferred embodiment of the present invention. 
           [0024]      FIG. 9  is a perspective view showing configurations of a first torque-transmitting device and a second torque-transmitting device illustrated in  FIG. 8 . 
           [0025]      FIG. 10  is a view showing an operation of the torque-transmitting device of  FIG. 1 . 
           [0026]      FIG. 11  is a view showing an operation of the torque-transmitting device in the condition illustrated in  FIG. 10 . 
           [0027]      FIG. 12  is a view showing another operation of the torque-transmitting device according to the first preferred embodiment of  FIG. 1 . 
           [0028]      FIG. 13  is a view showing an operation of the torque-transmitting device in the condition illustrated in  FIG. 12 . 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0029]    Reference will be now made in detail to the preferred embodiment of the present invention with reference to the attached drawings. 
         [0030]    First, referring to  FIGS. 1 and 2 , the entire configuration of a torque-transmitting device according to a first preferred embodiment of the present invention will be described in brief. 
         [0031]    As shown in  FIGS. 1 and 2 , the torque-transmitting device according to the present invention includes a driving motor  100 , a driving rotor  220 , a slave rotor  200 , a lever  300 , a first mounting part  400 , a second mounting part  500 , and a torque-transmitting device  300 . 
         [0032]    The first mounting part  400  is a part where one end portion of the lever  300  to which force is inputted is located, and includes first main support rods  410  and first vertically moving rods  420 . 
         [0033]    Two first main support rods  410  are spaced apart from each other at a predetermined interval and face each other. 
         [0034]    Moreover, the first main support rods  410  includes: a driving connection shaft  411  to which the driving rotor  220  is connected; and a slave connection shaft  412  to which the slave rotor  200  is connected. In this instance, the driving rotor  220  and the slave rotor  200  are connected with each other by a belt or a chain B to thereby transmit driving power. 
         [0035]    The first vertically moving rods  420 , to which one end portion of the lever  300  is connected, are mounted on the first main support rods  410 . Two first vertically moving rods  420  in a pair are in a bar shape like the first main support rods  410  and face with each other at a predetermined interval. 
         [0036]    Each of the first vertically moving rods  420  includes a first guide rail  421  formed on the inner face thereof along a longitudinal direction. The first guide rail  421  is adapted to guide the end portion of the lever  300  to do a vertical movement smoothly. 
         [0037]    A fixing plate  2  is joined to upper faces of the first main support rods  410  and the first vertically moving rods  420  in such a way as to fix the positions of the first main support rods  410  and the first vertically moving rods  420 . 
         [0038]    The driving motor  100  is connected with the driving connection shaft  411  by a connection belt  470 , and the driving power transferred from the driving motor  100  is transferred to the driving connection shaft  411 . The driving connection shaft  411  rotates the driving rotor  220  and vertically moves the end portion of the lever  300  while the slave rotor  200  is rotated by the belt or chain B. 
         [0039]    In this instance, as shown in  FIG. 2 , driving rods  700  are fixed and disposed at the end portion of the lever  300  and the slave rotor  200 , and one end portion of the driving rod  700  is eccentrically fixed to the slave rotor  200  in such a fashion as to be rotatably connected in an eccentric state, and the other end portion of the driving rotor  700  is fixed at the end portion of the lever  300 . 
         [0040]    In the meanwhile, a fulcrum  800  of the lever  300  is rotatably fixed on a support member  501  mounted between the first mounting part  400  and the second mounting part  500 . 
         [0041]    It is preferable that a distance between the support member  501  and the first mounting part  400  is longer than a distance between the support member  501  and the second mounting part  500  and a distance between one end portion of the lever  300  and the fulcrum  800  is longer than a distance between the fulcrum  800  and the other end portion of the lever  300 . Moreover, the magnitude of force applied to the other end portion of the lever  300  can be controlled by adjusting the ratio of the distances. 
         [0042]    Furthermore, second main support rods  510  are mounted on the second mounting part  500  to support the other end portion of the lever  300 . In this instance, it is preferable that the other end portion of the lever  300  is supported by the second main support rods  510  while guiding vertically moving parts. 
         [0043]    Additionally, a torque device  900  connected with the other end portion of the lever  300  is installed on the second mounting part  500 , and will be described in detail later. 
         [0044]    In the meantime, referring to  FIG. 3 , the lever  300  and peripheral units used for the torque device  900  according to the first preferred embodiment of the present invention will be described in more detail. 
         [0045]    As shown in  FIG. 3 , the lever  300  of a single body is illustrated in the drawings, but it is not restricted to the drawings and levers of various forms, for instance, a lever, which is made by two parts combined with each other, may be also used. 
         [0046]    First guide rods  330  are joined to upper and lower faces of the one end portion of the lever  300 , and each of the first guide rods  330  is formed to extend from a first lever  310  to one side, so that a first space portion  332  is formed between the first guide rods  330 . Moreover, a first blocking plate  333  is mounted at one end portion of each first guide rod  330  to thereby block the side of the first space portion  332 . 
         [0047]    In this instance, a first auxiliary guide rail  334  is formed on the inner face of each first guide rod  330 , a first laterally movable roller unit  340  is inserted and mounted in the first space portion  332  between the first guide rods  330 , and upper and lower rollers of the first laterally movable roller unit  340  are seated on the first auxiliary guide rail  334  of the first guide rod  330 . 
         [0048]    Moreover, the first laterally movable roller unit  340  has a through hole formed at the center thereof, and a penetration shaft  350  is inserted into the through hole. Furthermore, first vertically movable roller units  360  for guiding a vertical movement of the first lever  310  are respectively mounted on both ends of the penetration shaft  350 . 
         [0049]    As shown in  FIG. 2 , the right and left rollers of the first vertically movable roller units  360  are respectively seated and connected onto the first guide rails  421  of the first vertically moving rods  420 . 
         [0050]    Meanwhile, second guide rods  330 A are respectively mounted on upper and lower faces of the other end portion of the lever  300 . A second space  332 A is formed between the second guide rods  330 A and a second blocking plate  333 A is joined to one side to thereby block the side. 
         [0051]    In addition, a second auxiliary guide rail  334 A is formed on the inner face of the second guide rod  330 A and second laterally movable roller units  340 A are mounted inside a second space portion  332 A, and hence, the upper and lower rollers are seated on the second auxiliary guide rail  334 A. In this instance, it is preferable that the second laterally movable roller units  340 A have the same structure as the first laterally movable roller units  340 . 
         [0052]    Moreover, a second penetration shaft  350 A is mounted at the center of the second auxiliary guide rail  334   a,  and second vertically movable roller units  360 A are mounted at both ends of the second penetration shaft  350 A. It is preferable that the second vertically movable roller units  360 A have the same structure as the first vertically movable roller units  360 . 
         [0053]    Therefore, when the lever  300  rotates around the fulcrum  800 , the laterally movable roller units  340  and  340 A guide the motion of the lever  300  while moving in a lateral direction, and the vertically movable roller units  360 ,  360 A guide the motion of the lever  300  while moving in a vertical direction, so that the lever  300  can minimize friction force and smoothly work without overload. 
         [0054]    Now, concrete structures of the laterally movable roller units or the vertically movable roller units (hereinafter, called “roller unit”) will be described in detail. 
         [0055]    The roller units include a first plate P 1 , a second plate P 2 , and four rollers R 1 , R 2 , R 3  and R 4 , which are disposed between the first plate P 1  and the second plate P 2 . 
         [0056]    The first plate P 1  and the second plate P 2  are spaced apart from each other at a predetermined interval and are faced with each other. 
         [0057]    The first plate P 1  (or the second plate P 2 ) includes: rotary centers S 1 , S 2 , S 3  and S 4  that are formed on the inner face thereof in parallel and spaced apart from each other at predetermined intervals; and rollers R 1 , R 2 , R 3  and R 4  respectively rotatably mounted on the rotary centers S 2 , S 2 , S 3  and S 4 . 
         [0058]    The rollers R 1 , R 2 , R 3  and R 4  respectively protrude toward one end side and the other end side of the first plate P 1  and the second plate P 2 , and the protruding roller portions rotatably move along the guide rail. 
         [0059]    In the meantime,  FIG. 3  shows an exploded perspective view of the torque device  900  as shown in  FIGS. 1 and 2 . Referring to  FIG. 3 , the torque device  900  of the first preferred embodiment illustrated in  FIGS. 1 and 2  will be described in more detail. 
         [0060]    A connection part  710  that is perforated by the second penetration shaft  350 A and vertically moves along the motion of the other end portion of the lever  300  is disposed at the other end portion of the lever  300 . For your convenience, the connection part  710  is in a cut form in  FIG. 3 , but preferably, the connection part  710  may have an integrated form and be rotatably fixed at the other end portion of the lever  300  by the second penetration shaft  350 A. 
         [0061]    It is preferable that an actuator  910  is disposed on one side of the connection part  710  and a guide bar  722  is disposed on the other side of the connection part  710 . In  FIG. 3 , the actuator  910  is located below the connection part  710  and the guide bar  722  is located above the connection part  710 , and vice versa. 
         [0062]    The connection part  710  shows a rectilinear motion in a vertical direction as the lever  300  rotates around the fulcrum  800 . 
         [0063]    In this instance, because the connection part  710  is mounted rotatably on the second penetration shaft  350 A, the lever  300  can move in the vertical direction even though it rotates around the fulcrum  800 . 
         [0064]    The guide bar  722  is inserted into a guide hole  3  to guide a vertically rectilinear motion of the connection part  710 , and the actuator  910  disposed on one side of the connection part  710  is also guided by the first and second clutches  921  and  932  to do the rectilinear motion. 
         [0065]    Meanwhile, as shown in  FIGS. 1 to 3 , the first clutch  921  and the second clutch  932  are respectively located on one side and the other side of the actuator  910 . In this instance, the first clutch  921  drivingly rotates relative to a downward rectilinear motion of the actuator  910  and idles relative to an upward rectilinear motion, on the contrary to the above, the second clutch  932  idles relative to the downward rectilinear motion of the actuator  910  and drivingly rotates relative to the upward rectilinear motion. 
         [0066]    A first rack gear part (not shown in the drawings, opposed to a second rack gear part of the actuator  910  in  FIG. 3 ) is disposed on a corresponding face to the first clutch  921  of the actuator  910  and interlocks the first clutch  921 . Additionally, a second rack gear part  912  is disposed on a corresponding face to the second clutch  932  and interlocks the second clutch  932 . 
         [0067]    Furthermore, as shown in  FIGS. 1 to 3 , the torque device  900  includes: a first shaft  920  adapted for providing a driving force to a loaded device while rotating as the central shaft of the first clutch  921 ; and a second shaft  930  adapted for generating torque, which will be transferred to the first shaft  920 , while rotating as the central shaft of the second clutch  932 . 
         [0068]    When the actuator  910  descends, the first clutch  921  rotates the first shaft  920  while drivingly rotating (which is a contrary concept of idle rotation and is a driving force to drive the loaded device), and in this instance, the second clutch  932  rotates in the opposite direction of the first clutch  921  but idly rotates without any rotation of the second shaft  930 . 
         [0069]    When the actuator  910  ascends, the second cultch  932  rotates the second shaft  930  while drivingly rotating, and in this instance, the first clutch  921  rotates in the opposite direction of the second clutch  932  but idly rotates without any rotation of the first shaft  920 . 
         [0070]    In the meantime, a first driving gear  941  is rotatably connected to the first shaft  920  and a second driving gear  952  is rotatably connected to the second shaft  930 . 
         [0071]    Furthermore, the first driving gear  941  and the second driving gear  952  are connected with each other by a connection member  960 , so that the second driving gear  952  can be rotated by the connection member  960  when the first driving gear  941  is rotated and the first driving gear  941  is rotated by the connection member  960  when the second driving gear  952  is rotated. 
         [0072]    Accordingly, due to the connection member  960 , the first driving gear  941  and the second driving gear  952  can be rotated in the same direction while transmitting driving force to each other. 
         [0073]    As shown in  FIG. 3 , the connection member  960  may be a timing belt having a toothed structure that can be teeth-coupled with toothed structures of the first driving gear  941  and the second driving gear  952 . 
         [0074]    Hereinafter, referring to  FIGS. 4 to 7 , an operation of the torque-transmitting device according to the present invention will be described. 
         [0075]      FIGS. 4 and 5  illustrate the operation of the torque-transmitting device according to the preferred embodiment of the present invention of  FIG. 1 , wherein  FIG. 4  shows an operation when the other end portion of the lever descends and  FIG. 5  shows an operation of the torque-transmitting device in the condition of  FIG. 4 . 
         [0076]    Additionally,  FIG. 6  shows an operation when the other end portion of the lever ascends in the torque-transmitting device illustrated in  FIG. 1 , and  FIG. 7  shows an operation of the torque-transmitting device in the condition of  FIG. 6 . 
         [0077]    First, as shown in  FIG. 4 , when the driving motor is operated and rotates the slave rotor  200 , the driving rod  700  which is eccentrically fixed to the slave rotor  200  moves in such a way as to move one end portion of the lever  300  in the upward and downward directions. 
         [0078]    In this instance, the vertically movable roller units and the laterally movable roller units are moved along the guide rail and the auxiliary guide rail to thereby make the vertical rectilinear reciprocating motion of the lever  300  smoother, and because it is previously described, it will be omitted. 
         [0079]    When one end portion of the lever  300  ascends higher than the fulcrum  800  while the slave rotor  200  rotates, the other end portion of the lever  300  descends. 
         [0080]    In this instance, the actuator  910  disposed on the first connection part  710  connected to the other end portion of the lever  300  is also descended, and the actuator  910  descends and drivingly rotates the first clutch  921  (see a part indicated by a dotted arrow in the drawing) and idles the second clutch  932 . (The second clutch  932  rotates in the opposite direction of the first clutch  921  but idly rotates) 
         [0081]    In this instance, a first rack gear part  911  of the actuator  910  can convert the rectilinear motion of the actuator  910  into a rotary motion because the first rack gear part  911  interlocks the first clutch  921 . 
         [0082]    While the first clutch  921  drivingly rotates, the first shaft  920  is rotated and the first driving gear  941  is also rotated by the rotation of the first shaft  920 . 
         [0083]    While the first driving gear  941  is rotated, the connection member  960  is also rotated and the second driving gear  952  is also rotated in the same direction as the first driving gear  941  by the connection member  960 . Moreover, while the second driving gear  952  rotates, the second shaft  930  is also rotated. 
         [0084]    In the meantime, the solid line arrow presents a rotation of the shaft and the dotted line arrows present rotations of the clutch and the driving gear. 
         [0085]    As shown in  FIG. 5 , when the actuator  910  moves down, only the second clutch  932  idles but the first clutch  921 , the first shaft  920 , the first driving gear  941 , the second driving gear  952 , and the second shaft  930  are all rotated. 
         [0086]    In this instance, the first shaft  920  rotates halfway. The driving force for the remaining half rotation is obtained by the second clutch  932  working while the actuator  910  moves up. 
         [0087]    That is, as shown in  FIG. 6 , when one end portion of the lever  300  moves down, the other end portion of the lever  300  moves up, and in this instance, the actuator  910  moves upward and drivingly rotates (see the dotted line arrow in  FIG. 6 ) the second clutch  932  but idly rotates (the first clutch  921  rotates in the opposite direction to the second clutch and idly rotates). 
         [0088]    In this instance, because the second rack gear part  912  of the actuator  910  interlocks the second clutch  932 , the rectilinear motion of the actuator  910  can convert the rectilinear motion of the actuator  910  into a rotary motion of the second clutch  932 . 
         [0089]    While the second clutch  932  drivingly rotates, the second shaft  930  is rotated, and the second driving gear  952  is rotated by the rotation of the second shaft  930 . 
         [0090]    While the first driving gear  952 , the connection member  960  is also rotated, and the first driving gear  941  is also rotated in the same direction as the second driving gear  952  by the connection member  960 . Moreover, when the first driving gear  941  rotates, the first shaft  920  is also rotated. 
         [0091]    In  FIG. 7 , the solid line arrow presents the rotation of the shaft and the dotted line arrow presents the rotations of the clutch and the driving gear. 
         [0092]    As shown in  FIG. 7 , when the actuator  910  moves up, only the first clutch  921  idly rotates, but the second clutch  932 , the second shaft  930 , the second driving gear  952 , the first driving gear  941 , and the first shaft  920  are all rotated. 
         [0093]    In this instance, the first shaft  920  rotates as much as the remaining half rotation length, and hence, it can rotate in safety. That is, the first shaft  920  can rotate perfectly along the upward and downward movement of the actuator  910 . 
         [0094]    If the distance ranging from the one end portion of the lever  300  to the fulcrum  800  is longer than the distance ranging from the other end portion of the lever  300  to the fulcrum  800 , when the lever  300  is operated, the force applied to the other end portion of the lever  300  may become greater than the forced applied to the one end portion of the lever  300 . 
         [0095]    Because greater power is applied to the other end portion of the lever  300  not the one end portion, the force to rotate the first shaft  920  and the second shaft  930  becomes greater, so that instant torques of the first shaft  920  and the second shaft  930  rotating by the greater force can be amplified, and hence, the rate of production can be also increased. 
         [0096]    Meanwhile, referring to  FIGS. 8 and 9 , the entire configuration of the torque-transmitting device according to a second preferred embodiment of the present invention will be described in brief. 
         [0097]    As shown in  FIGS. 8 and 9 , the torque-transmitting device according to the second preferred embodiment of the present invention provides a double structure that has a first torque-transmitting device A and a second torque-transmitting device B. 
         [0098]    In  FIG. 8 , the first torque-transmitting device A and the second torque-transmitting device B are connected with each other, but in  FIG. 9 , the first torque-transmitting device A and the second torque-transmitting device B are separated from each other. 
         [0099]    As shown in  FIGS. 8 and 9 , the structures of the first torque-transmitting device A and the second torque-transmitting device B are the same as the torque-transmitting device of  FIG. 1 . That is, the double structure of the torque-transmitting device according to the second preferred embodiment is virtually identical with a state where two torque-transmitting devices of  FIG. 1  are mounted in parallel in such a way as to be connected with each other. 
         [0100]    Here, the first torque-transmitting device A and the second torque-transmitting device B are respectively operated by a single driving motor  100 , a first lever  300   a  and a second lever  300   b  are supported by a single fulcrum  800 , and a first torque device  900   a  of the first torque-transmitting device A and a second torque device  900   b  of the second torque-transmitting device B respectively operate the first shaft  920  and the second shaft  930 . 
         [0101]    That is, as shown in  FIGS. 8 and 9 , the first torque-transmitting device A includes a first driving rotor  220   a  and a first slave rotor  200   a  driven by the driving motor  100 , a first lever  300   a,  a first mounting part  400   a,  a second mounting part  500   a,  and the first torque device  900   a.  Additionally, the second torque-transmitting device B also includes a second driving rotor  220   b  and a second slave rotor  200   b  driven by the driving motor  100 , a second lever  300   b,  a third mounting part  400   b,  a fourth mounting part  500   b,  and the second torque device  900   b.    
         [0102]    Furthermore, the detailed configuration and the operation principle of the torque-transmitting device according to the second preferred embodiment are also virtually identical with the detailed configuration of the torque-transmitting device according to the first embodiment, and hence, description of the detailed configuration illustrated in  FIGS. 8 and 9  will be omitted. 
         [0103]    Meanwhile,  FIGS. 10 to 13  illustrate the operation of the torque-transmitting device with the double structure according to the second preferred embodiment.  FIG. 10  illustrates the operation of the torque-transmitting device in a state where a first driving rod  700   a  of the first torque-transmitting device A is located near the top dead point (b′˜b″) of the first slave rotor  200   a  and a second driving rod  700   b  of the second torque-transmitting device B is rotated toward the bottom dead point of the second slave rotor  200   b.    FIG. 11  illustrates the operation of the torque devices  900   a  and  900   b  in the condition illustrated in  FIG. 10 . 
         [0104]    Moreover,  FIG. 12  illustrates the operation of the torque-transmitting device in a state where the first driving rod  700   a  of the first torque-transmitting device A is located near the bottom dead point (a′˜a″) of the first slave rotor  200   a  and a second driving rod  700   b  of the second torque-transmitting device B is rotated toward the top dead point of the second slave rotor  200   b.    FIG. 13  illustrates the operations of the torque devices  900   a  and  900   b  in the condition of  FIG. 12 . 
         [0105]    First, as shown in  FIG. 10 , when the driving motor is operated and the first driving rotor  200   a  and the second slave rotor  200   b  are respectively rotated, the first driving rod  700   a  and the second driving rod  700   b  eccentrically fixed to the first driving rotor  200   a  and the second slave rotor  200   b  upwardly or downwardly moves end portions of the first lever  300   a  and the second lever  300   b  while respectively moving. 
         [0106]    In this instance, as shown in  FIGS. 10 and 11 , the first actuator  910   a  disposed on the first connection part  710   a  connected to the other end portion of the first lever  300   a  of the first torque-transmitting device A also moves down. While moving down, the first actuator  910   a  drivingly rotates the first clutch  921   a  (indicated as the dotted line arrow in the drawing) and idly rotates the second clutch  932   a  (the second clutch is rotated in the opposite direction of the first cultch but idles.). 
         [0107]    In this instance, because a first rack gear part  911   a  of the first actuator  910   a  can convert a rectilinear motion of the first actuator  910   a  into a rotary motion of the first clutch  921   a.    
         [0108]    While drivingly rotating, the first clutch  921   a  rotates the first shaft  920 , and the first driving gear  941   a  is also rotated by the rotation of the first shaft  920 . 
         [0109]    When the first driving gear  941   a  rotates, the first connection member  960   a  is also rotated, and the second driving gear  952   a  is also rotated in the same direction as the first driving gear  941   a  by the first connection member  960   a.  Furthermore, when the second driving gear  952   a  is rotated, the second shaft  930  is also rotated. 
         [0110]    Additionally, the second actuator  910   b  disposed on the second connection part  710   b  connected to the other end portion of the second lever  300   b  of the second torque-transmitting device B moves up. While moving up, the second actuator  910   b  drivingly rotates the fourth clutch  932   b  (see the dotted line arrow in the drawing) and idly rotates the third clutch  921   b  (the third clutch rotates in the opposite direction of the fourth clutch but idles). 
         [0111]    In this instance, because the fourth rack gear part  912   b  of the second actuator  910   b  interlocks the fourth clutch  932   b,  the rectilinear motion of the second actuator  910   b  can be converted into a rotary motion of the fourth clutch  932   b.    
         [0112]    While drivingly rotating, the fourth clutch  932   b  rotates the second shaft  930 , and the fourth driving gear  952   b  is also rotated by the rotation of the second shaft  930 . 
         [0113]    While rotating, the fourth driving gear  952   b  rotates the second connection member  960   b,  and the third driving gear  941   b  is also rotated in the same direction as the fourth driving gear  952   b  due to the second connection member  960   b.  Furthermore, the third driving gear  941   b  rotates the first shaft  920  while rotating. 
         [0114]    Accordingly, the first shaft  920  and the second shaft  930  are rotated by the first torque device  900   a  and the second torque device  900   b ) 
         [0115]    In this instance, as shown in  FIG. 10 , when the first driving rod  700   a  of the first torque-transmitting device A passes near the top dead point of the first slave rotor  200   a  (in the drawing, a position between b′ and b″), the first lever  300   a  may be hardly operated, and hence, the first actuator  910   a  may hardly do the rectilinear motion. 
         [0116]    Even in the above case, because the second lever  300   b  of the second torque-transmitting device B makes the second actuator  910   b  do the rectilinear motion, the second torque-transmitting device B can continuously drive the first shaft  920  and the second shaft  930  by additionally adding the first torque-transmitting device A. 
         [0117]    In  FIG. 11 , the solid line arrow presents the rotation of the shaft and the dotted line arrow presents the rotations of the clutch and the driving gear. 
         [0118]    Meanwhile, as shown in  FIGS. 12 and 13 , when the first driving rod  700   a  of the first torque-transmitting device A passes near the bottom dead point (position between a′ and a″ in  FIG. 12 ), the first actuator  910   a  disposed on the first connection part  710   a  connected to the other end portion of the first lever  300   a  of the first torque-transmitting device A moves up, and the first actuator  910   a  drivingly rotates the second clutch  932   a  (see the dotted line arrow in the drawing) and idly rotates the first clutch  921   a  while moving up. 
         [0119]    In this instance, as shown in  FIGS. 12 and 13 , because the second rack gear part  912   a  of the first actuator  910   a  interlocks the second clutch  932   a,  the rectilinear motion of the actuator  910   a  can be converted into a rotary motion of the second clutch  932   a.    
         [0120]    The second clutch  932   a  rotates the second shaft  930  while drivingly rotating, and the second driving gear  952   a  is rotated by the rotation of the second shaft  930 . 
         [0121]    The second driving gear  952   a  rotates the connection member  960   a  while rotating, and the first driving gear  941   a  is also rotated in the same direction as the second driving gear  952   a  by the connection member  960   a.  Moreover, the first driving gear  941   a  rotates the first shaft  920  while rotating. 
         [0122]    Moreover, the second actuator  910   b  disposed on the second connection part  710   b  connected to the other end portion of the second lever  300   b  of the second torque-transmitting device B moves down. While moving down, the second actuator  910   b  drivingly rotates the second clutch  921   b  (see the dotted line arrow in the drawing) and idly rotates the fourth clutch  932   b.    
         [0123]    In this instance, because the third rack gear part  911   b  of the second actuator  910   b  interlocks the third clutch  921   b,  the rectilinear motion of the second actuator  910   b  can be converted into a rotary motion of the third clutch  921   b.    
         [0124]    The third clutch  921   b  rotates the first shaft  920  while drivingly rotating, and the third driving gear  941   b  is also rotated by the rotation of the first shaft  920 . 
         [0125]    When the third driving gear  941   b  is rotated, the second connection member  960   b  is also rotated, and the fourth driving gear  952   b  is rotated in the same direction as the third driving gear  941   b  by the second connection member  960   b.  Additionally, when the fourth driving gear  952   b  is rotated, the second shaft  930  is also rotated. 
         [0126]    Accordingly, the first shaft  920  and the second shaft  930  are rotated by the first torque device  900   a  and the second torque device  900   b.    
         [0127]    In this instance, as shown in  FIG. 12 , when the first driving rod  700   a  of the first torque-transmitting device A passes near the bottom dead point of the first slave rotor  200   a  (in the drawing, the position between a′ and a″), the first lever  300   a  may be hardly operated, and hence, the first actuator  910   a  may hardly do the rectilinear motion. 
         [0128]    Even in the above case, because the second lever  300   b  of the second torque-transmitting device B makes the second actuator  910   b  do the rectilinear motion, the second torque-transmitting device B can continuously drive the first shaft  920  and the second shaft  930  by additionally adding the first torque-transmitting device A. 
         [0129]    The torque-transmitting device according to the present invention can convert torque input at one end portion of the lever into a greater force at the other end portion of the lever using the principle of lever to thereby gain a great rate of production.