Abstract:
A speed increasing bidirectional mechanical converter, including a main shaft and a speed increasing planet gear unit is disclosed. The speed increasing planet gear unit includes a first ring gear, a planet gear, a sun gear and a planet carrier, wherein the planet gear is mounted on the planet carrier. The planet gear is arranged between the first ring gear and the sun gear, and rotates in an opposite direction against the sun gear. The speed increasing bidirectional mechanical converter further includes a reversing means, via which the first ring gear and the sun gear drive the main shaft. When in use, the planet carrier is kept still, and the main shaft rotates in the preset direction. The speed increasing bidirectional mechanical converter realizes the direction reverse by using the speed increasing planet gear unit, which simplifies the structure, facilitates the manufacture and decreases the space it occupies and its weight. A screwdriver and a wrench having the speed increasing bidirectional mechanical converter are provided.

Description:
FIELD OF THE INVENTION 
       [0001]    The present invention relates to a manual tool, more particularly, to a manual speed increasing bidirectional turning tool. 
       DESCRIPTION OF THE PRIOR ART 
       [0002]    A manual turning tool is used for turning a workpiece and forcing it to be in position. It usually includes screwdriver, wrench and so on. 
         [0003]    To increase the efficiency, prior screwdriver or wrench is equipped with a mechanical converter, which includes a main shaft and two driving parts. The two driving parts rotate in an opposite direction and drive the main shaft via one-way clutches whose functioning directions are the same. When a torque is applied to the driving parts, one of the two driving part drives the main shaft to rotate and the other idles. The main shaft rotates in one direction no matter the input torque is clockwise or anticlockwise. Thus input torque in any direction can be utilized and the efficiency of the tool is highly increased. 
         [0004]    To further increase the efficiency, some screwdriver or wrench is equipped with speed increasing means, which generally is planet gear unit. 
         [0005]    In prior screwdriver or wrench, the direction switching and the speed increasing functions are achieved by different parts. The structure is comparatively complicated, the manufacture is comparatively complex, and the space occupied and the weigh are comparatively large. 
       SUMMARY OF THE INVENTION 
       [0006]    The present invention provides a speed increasing bidirectional mechanical converter, wherein the direction switching is achieved by a speed increasing planet gear unit, which simplifies the structure of the speed increasing bidirectional mechanical converter, facilitates the manufacture and meanwhile decreases the space occupied inside the tool and the weight. 
         [0007]    The present invention further provides a screwdriver including the speed increasing bidirectional mechanical converter. Keeping the holding ring of the screwdriver still, when the handle rotates in a preset direction, the bit of the screwdriver rotates in the preset direction at the same speed; when the handle rotates in a direction opposite to the preset direction, the bit of the screwdriver rotates in the preset direction at triple the speed. 
         [0008]    The present invention further provides a wrench including the speed increasing bidirectional mechanical converter. Keeping the holding ring of the wrench still, when the handle rotates in a preset direction, the torque outputting part of the wrench rotates in the preset direction at the same speed; when the handle rotates in a direction opposite to the preset direction, the torque outputting part of the wrench rotates in the preset direction at triple the speed. 
         [0009]    The present invention provides a speed increasing bidirectional mechanical converter, comprising
       a main shaft,   a speed increasing planet gear unit, which includes a first ring gear, a planet gear, a sun gear and a planet carrier, wherein the planet gear is mounted on the planet carrier, the planet gear is arranged between the first ring gear and the sun gear, and the first ring gear rotates in an opposite direction against the sun gear;   the speed increasing bidirectional mechanical converter further includes   a reversing means, via which the first ring gear and the sun gear drive the main shaft;   when in use, the planet carrier is kept still, and the main shaft rotates in a preset direction no matter a clockwise or anticlockwise torque is applied to the first ring gear.       
 
         [0015]    The speed increasing bidirectional mechanical converter provided in the present invention utilizes the technical feature that in the speed increasing planet gear unit the first ring gear and the sun gear rotates in opposite directions, and makes the first ring gear and the sun gear to drive the main shaft respectively via the reversing means, thereby realizes the reverse of the directions. The main shaft rotates in a preset direction no matter a clockwise or anticlockwise torque is applied to the first ring gear. 
         [0016]    The speed increasing bidirectional mechanical converter provided in the present invention has simple structure and is easy to manufacture, and the space it occupies and its weight in the tool are decreased as well. 
         [0017]    Further, the reversing means includes a first one-way clutch and a second one-way clutch with same functioning directions which are same with the preset direction. 
         [0018]    The speed increasing bidirectional mechanical converter provided in the present invention makes the first ring gear and the sun gear to drive the main shaft respectively via the one-way clutches with same functioning directions, and thereby realizes the reverse of the directions. 
         [0019]    Further, the speed increasing bidirectional mechanical converter further includes a second ring gear which is coaxially arranged with the first ring gear and connected to the first one-way clutch. 
         [0020]    Further, the first ring gear and the second ring gear are integrated or coaxially connected. 
         [0021]    Further, the speed increasing bidirectional mechanical converter further includes a third ring gear which is coaxially arranged with the sun gear and connected to the second one-way clutch. 
         [0022]    Further, the sun gear and the third ring gear are integrated or coaxially connected. 
         [0023]    Further, the speed increasing bidirectional mechanical converter further includes a switching means, which is used for switching the functioning directions of the first one-way clutch and the second one-way clutch. 
         [0024]    Further, the speed increasing bidirectional mechanical converter further includes a holding means, which is used for keeping the planet carrier still. 
         [0025]    Further, the holding means and the planet carrier are integrated or fixedly connected. 
         [0026]    Further, the holding means is a holding ring. 
         [0027]    Further, the main shaft rotates in the preset direction at an increased speed when a torque whose direction is opposite to the preset direction is applied to the first ring gear. 
         [0028]    Further, the transmission ratio of the rotation of the main shaft in the preset direction at an increased speed is equal to the gear ratio between the first ring gear and the planet gear. 
         [0029]    Further, the transmission ratio of the rotation of the main shaft in the preset direction at an increased speed is 3. 
         [0030]    Further, the main shaft rotates in the preset direction at a same speed when a torque whose direction is same with the preset direction is applied to the first ring gear. 
         [0031]    Further, the transmission ratio of the rotation of the main shaft in the preset direction at a same speed is 1. 
         [0032]    The present invention further provides a screwdriver, including
   a rod,   a speed increasing bidirectional mechanical converter, comprising
       a main shaft, which is coaxially arranged with the rod;   a speed increasing planet gear unit, which includes a first ring gear, a planet gear, a sun gear and a planet carrier, wherein the planet gear is mounted on the planet carrier, the planet gear is arranged between the first ring gear and the sun gear, and the first ring gear rotates in an opposite direction against the sun gear;   
       a handle, which is coaxially arranged with the first ring gear and used for inputting torque;   the speed increasing bidirectional mechanical converter further includes
       a reversing means, via which the first ring gear and the sun gear drive the main shaft;   when in use, the planet carrier is kept still, and the rod rotates in a preset direction no matter a clockwise or anticlockwise torque is applied to the first ring gear by the handle.   
       
 
         [0041]    Further, the reversing means includes a first one-way clutch and a second one-way clutch whose functioning directions are same as the preset direction. 
         [0042]    Further, the speed increasing bidirectional mechanical converter further includes second ring gear which is coaxially arranged with the first ring gear and connected to the first one-way clutch. 
         [0043]    Further, the first ring gear and the second ring gear are one-piece or connected coaxially. 
         [0044]    Further, the speed increasing bidirectional mechanical converter further includes a third ring gear which is coaxially arranged with the sun gear and connected to the second one-way clutch. 
         [0045]    Further, the sun gear and the third ring gear are integrated or coaxially connected. 
         [0046]    Further, the speed increasing bidirectional mechanical converter further includes switching means, which is used for switching the functioning directions of the first one-way clutch and the second one-way clutch. 
         [0047]    Further, the switching means includes a switching shaft, a spiral groove arranged on the switching shaft and a push button, one end of which is arranged in the spiral groove. 
         [0048]    Further, the speed increasing bidirectional mechanical converter further includes a holding means, which is used for keeping the planet carrier still. 
         [0049]    Further, the holding means and the planet carrier are integrated or fixedly connected. 
         [0050]    Further, the holding means is a holding ring. 
         [0051]    Further, the main shaft rotates in the preset direction at an increased speed when a torque whose direction is opposite to the preset direction is applied to the first ring gear. 
         [0052]    Further, the transmission ratio of the rotation of the main shaft in the preset direction at an increased speed is equal to the gear ratio between the first ring gear and the planet gear. 
         [0053]    Further, the transmission ratio of rotation of the main shaft in the preset direction at an increased speed is 3. 
         [0054]    Further, the main shaft rotates in the preset direction at a same speed when a torque whose direction is same with the preset direction is applied to the first ring gear. 
         [0055]    Further, the transmission ratio of the rotation of the main shaft in the preset direction at a same speed is 1. 
         [0056]    The present invention further discloses a wrench, including
   a torque outputting part,   a speed increasing bidirectional mechanical converter, comprising
       a main shaft, which is coaxially arranged with the torque outputting part;   a speed increasing planet gear unit, which includes a first ring gear, a planet gear, a sun gear and a planet carrier, wherein the planet gear is mounted on the planet carrier, the planet gear is arranged between the first ring gear and the sun gear, and the first ring gear rotates in an opposite direction against the sun gear;   
       a handle, which is coaxially arranged with the first ring gear and used for inputting torque;   the speed increasing bidirectional mechanical converter further includes
       a reversing means, via which the first ring gear and the sun gear drive the main shaft;   when in use, the planet carrier is kept still, and the torque outputting part rotates in a preset direction no matter a clockwise or anticlockwise torque is applied to the first ring gear by the handle.   
       
 
         [0065]    Further, the reversing means includes a first one-way clutch and a second one-way clutch whose functioning directions are same as the preset direction. 
         [0066]    Further, the speed increasing bidirectional mechanical converter further includes a second ring gear which is coaxially arranged with the first ring gear and connected to the first one-way clutch. 
         [0067]    Further, the first ring gear and the second ring gear are integrated or coaxially connected. 
         [0068]    Further, the speed increasing bidirectional mechanical converter further includes a third ring gear which is coaxially arranged with the sun gear and connected to the second one-way clutch. 
         [0069]    Further, the sun gear and the third ring gear are integrated or coaxially connected. 
         [0070]    Further, the speed increasing bidirectional mechanical converter further includes switching means, which is used for switching the functioning directions of the first one-way clutch and the second one-way clutch. 
         [0071]    Further, the switching means includes a switching shaft and a switching knob which is arranged on one end of the switching shaft. 
         [0072]    Further, the wrench further includes an unlocking means, which includes the switching knob and a groove arranged on the main shaft. 
         [0073]    Further, the speed increasing bidirectional mechanical converter further includes a holding means, which is used for keeping the planet carrier still. 
         [0074]    Further, the holding means and the planet carrier are integrated or fixedly connected. 
         [0075]    Further, the holding means is a holding ring. 
         [0076]    Further, the main shaft rotates in the preset direction at an increased speed when a torque whose direction is opposite to the preset direction is applied to the first ring gear. 
         [0077]    Further, the transmission ratio of the rotation of the main shaft in the preset direction at an increased speed is equal to the gear ratio between the first ring gear and the planet gear. 
         [0078]    Further, the transmission ratio of rotation of the main shaft in the preset direction at an increased speed is 3. 
         [0079]    Further, the main shaft rotates in the preset direction at a same speed when a torque whose direction is same with the preset direction is applied to the first ring gear. 
         [0080]    Further, the transmission ratio of the rotation of the main shaft in the preset direction at a same speed is 1. 
         [0081]    Compared with the prior arts, the speed increasing bidirectional mechanical converter provided in the present invention has beneficial effects as follows: the structure of the speed increasing bidirectional mechanical converter is simplified, the manufacture is facilitated, and the space it occupies in the tool and its weight are decreased as well, by using the speed increasing planet gear unit to realize the reverse of the directions. 
         [0082]    The present invention will be described in detail hereinafter in combination with the figures and embodiments for better understanding the purpose, features and effects of the present invention. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0083]      FIG. 1  is a front view of a screwdriver including the speed increasing bidirectional mechanical converter in one embodiment of the present invention. 
           [0084]      FIG. 2  is a sectional view of the screwdriver shown in  FIG. 1 . 
           [0085]      FIG. 3  is an exploded view of the speed increasing bidirectional mechanical converter of the screwdriver shown in  FIG. 1 . 
           [0086]      FIG. 4  shows the connectivity of the speed increasing bidirectional mechanical converter of the screwdriver shown in  FIG. 1 . 
           [0087]      FIG. 5  shows the connectivity of the speed increasing bidirectional mechanical converter of the screwdriver shown in  FIG. 1 . 
           [0088]      FIG. 6  is a sectional view along B-B of the screwdriver shown in  FIG. 2 . 
           [0089]      FIG. 7  is a perspective view of the main shaft of the speed increasing bidirectional mechanical converter of the screwdriver shown in  FIG. 1 . 
           [0090]      FIG. 8  is a sectional view along C-C of the screwdriver shown in  FIG. 2 . 
           [0091]      FIG. 9  is a sectional view along D-D of the screwdriver shown in  FIG. 2 . 
           [0092]      FIG. 10  is a schematic view of the switching means of the speed increasing bidirectional mechanical converter of the screwdriver shown in  FIG. 1 . 
           [0093]      FIG. 11  is a sectional view along A-A of the screwdriver shown in  FIG. 2 . 
           [0094]      FIG. 12  is a front view of a wrench including the speed increasing bidirectional mechanical converter in another embodiment of the present invention. 
           [0095]      FIG. 13  is a part sectional view of the wrench shown in  FIG. 12 . 
           [0096]      FIG. 14  is an exploded view of the wrench shown in  FIG. 12 . 
           [0097]      FIG. 15  is a sectional view along A-A of the wrench shown in  FIG. 13 . 
           [0098]      FIG. 16  is a sectional view along B-B of the wrench shown in  FIG. 13 . 
           [0099]      FIG. 17  is a front view of the handle of the wrench shown in  FIG. 12 . 
           [0100]      FIG. 18  is a schematic view of the switching means of the speed increasing bidirectional mechanical converter of the wrench shown in  FIG. 12 . 
           [0101]      FIG. 19  is a sectional view along A-A of the wrench shown in  FIG. 13 . 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0102]    The clockwise direction and the anticlockwise direction are the clockwise direction and the anticlockwise direction seen from the handle to the rod of the screwdriver. 
         [0103]      FIG. 1  is a front view of a screwdriver including a speed increasing bidirectional mechanical converter in one embodiment of the present invention.  FIG. 2  is a sectional view of the screwdriver shown in  FIG. 1 . As shown in  FIGS. 1 and 2 , the screwdriver including the speed increasing bidirectional mechanical converter in the embodiment includes: a rod  11 , a button cover  15 , a holding means and a handle  13 . The screwdriver further includes a speed increasing bidirectional mechanical converter arranged in the holding means. 
         [0104]    In the embodiment, the holding means is a holding ring  14 , and the holding ring  14  is a cylindrical ring. 
         [0105]      FIG. 3  is an exploded view of the speed increasing bidirectional mechanical converter of the screwdriver shown in  FIG. 1 .  FIGS. 4 and 5  show the connectivity of the speed increasing bidirectional mechanical converter of the screwdriver shown in  FIG. 1 . As shown in  FIGS. 3-5 , the speed increasing bidirectional mechanical converter includes a main shaft  126 , a speed increasing planet unit and a reversing means. 
         [0106]    The speed increasing planet gear unit includes a first ring gear  1221 , a planet gear  1222 , a sun gear  1223  and a planet carrier  1224 , wherein the planet gear  1222  is mounted on the planet carrier  1224 , the planet gear  1222  is arranged between the first ring gear  1221  and the sun gear  1223 , and the first ring gear  1221  rotates in an opposite direction against the sun gear  1223 , as shown in  FIG. 6 . 
         [0107]    As shown in  FIG. 3 , the reversing means includes a first one-way clutch  1231  and a second one-way clutch  1232  with same functioning directions which are same with a preset direction, i.e. the direction the main shaft  126  rotates. 
         [0108]    The speed increasing bidirectional mechanical converter in the embodiment utilizes the technical feature that in the speed increasing planet gear unit the first ring gear  1221  and the sun gear  1223  rotate in opposite directions, and makes the first ring gear  1221  and the sun gear  1223  to drive the main shaft  126  respectively via the first one-way clutch  1231  and the second one-way clutch  1232  with same functioning directions, thereby realizes the reverse of the directions. The main shaft  126  rotates in the preset direction no matter a clockwise or anticlockwise torque is applied to the first ring gear  1221 . 
         [0109]    The speed increasing bidirectional mechanical converter further includes a second ring gear  124  which is coaxially arranged with the first ring gear  1221  and connected to the first one-way clutch  1231 . This enables the first ring gear  1221  to drive the main shaft  126  via the first one-way clutch  1231 . In the embodiment, the first ring gear  1221  and the second ring gear  124  are integrated. 
         [0110]    It also works that the first ring gear  1221  and the second ring gear  124  are non-integrated, but coaxially connected. 
         [0111]    The speed increasing bidirectional mechanical converter further includes a third ring gear  125  which is coaxially arranged with the sun gear  1223  and connected to the second one-way clutch  1232 . This enables the sun gear  1223  to drive the main shaft  126  via the second one-way clutch  1232 . In the embodiment, the sun gear  1223  and the third ring gear  125  are integrated. 
         [0112]    It also works that the sun gear  1223  and the third ring gear  125  are non-integrated, but coaxially connected. 
         [0113]      FIG. 7  shows the connectivity between the main shaft  126  and each part. 
         [0114]    The main shaft  126  is connected to the rod  11  via a pin, which enables the main shaft  126  and the rod  11  to be arranged coaxially. When the main shaft  126  rotates, it drives the rod  11  to rotate. 
         [0115]    In the embodiment, the first one-way clutch  1231  and the second one-way clutch  1232  are pawls. While the first one-way clutch  1231  and the second one-way clutch  1232  can be structured otherwise. 
         [0116]    As shown in  FIG. 8 , a blind hole is arranged in the switching shaft  121 . A spring is arranged in the blind hole. A ball is arranged at the opening of the blind hole. The pawl  1232  has a curved surface at the side facing the switching shaft  121 , which engages with the ball, forming a connection between the pawl  1232  and the switching shaft  121 , enabling the rotation of the switching shaft  121  to drive the pawl  1232  to rotate. 
         [0117]    The pawl  1232  is mounted on the main shaft  126  via a pin  1261 . There are teeth on the two opposite sides of the pawl  1232 . At the position shown in  FIG. 7 , the teeth on one side of the pawl  1232  engage with the third ring gear  125 , and when the third ring gear  125  rotates clockwise, the main shaft  126  is driven to rotate clockwise because the sun gear  1223  and the third ring gear  125  are integrated. That is to say, the sun gear  1223  drives the main shaft  126  to rotate clockwise. When the third ring gear  125  rotates anticlockwise, the pawl  1232  disengages with the third ring gear  125 , thus cannot drive the main shaft  126  to rotate. The third ring gear  125  idles relative to the main shaft  126 . That is to say, the sun gear  1223  idles relative to the main shaft  126 . 
         [0118]    As shown in  FIG. 9 , a blind hole is arranged in the switching shaft  121 . A spring is arranged in the blind hold. A ball is arranged at the opening of the blind hole. The pawl  1231  has a curved surface at the side facing the switching shaft  121 , which engages with the ball, forming a connection between the pawl  1231  and the switching shaft  121 . The pawl  1231  is mounted on the main shaft  126  via the pin  1261 . There are teeth on the two opposite sides of the pawl  1231 . At the position shown in  FIG. 8 , the teeth on one side of the pawl  1231  engage with the second ring gear  124 , and when the second ring gear  124  rotates clockwise, the main shaft  126  is driven to rotate clockwise because the first ring gear  1221  and the second ring gear  124  are integrated. That is to say, the first ring gear  1221  drives the main shaft  126  to rotate clockwise. When the second ring gear  124  rotates anticlockwise, the pawl  1231  disengages with the second ring gear  145 , thus cannot drive the main shaft  126  to rotate. The second ring gear  124  idles relative to the main shaft  126 . That is to say, the first ring gear  1221  idles relative to the main shaft  126 . 
         [0119]    At the position shown in  FIGS. 8 and 9 , the functioning directions of the pawls  1231  and  1232  are clockwise. That is to say, in the ring gears  124  and  125  which engage with the pawls  1231  and  1232 , only the one rotates clockwise can drive the main shaft  126  to rotate clockwise. That is to say, the preset direction is same with the functioning directions of the pawls  1232  and  1232 , which is clockwise. 
         [0120]    Rotate the switching shaft  121  to change the teeth of the pawls  1231  and  1232  that engage with the main shaft  126 , the rotating direction of the main shaft  126  can be reversed. 
         [0121]    The handle  13 , which is arranged coaxially with the first ring gear  1221 , is used for inputting torque. 
         [0122]    The holding ring  14  is used for keeping the planet carrier  1224  still. 
         [0123]    In the embodiment, the holding ring  14  and the planet carrier  1224  are integrated. 
         [0124]    It also works that the holding ring  14  and the planet carrier  1224  are non-integrated, but fixedly connected. 
         [0125]    When use the screwdriver of the embodiment, hold the holding ring  14  to keep the planet carrier  1224  still, rotate the handle  13  clockwise to apply a clockwise torque to the first ring gear  1221 , enabling the second ring gear  125  to rotate clockwise. As shown in  FIG. 9 , the second ring gear  125  drives the main shaft  126  to rotate clockwise, the first ring gear  1221  drives the sun gear  1223  to rotate anticlockwise via the planet gear  1222 , enabling the third ring gear  124  to rotate anticlockwise. As shown in  FIG. 8 , the third ring gear  124  idles relative to the main shaft  126 . That is to say, the sun gear  1223  idles relative to the main shaft  126 . 
         [0126]    In the screwdriver of the embodiment, the pawl  1231  and the first ring gear  1221  constitute a master ratchet, the pawl  1232  and the sun gear  1223  constitute an assistant ratchet. The planet gear  1222  is arranged between the sun gear  1223  and the second ring gear  125  which is integrated with the first ring gear. After reversing by the holding ring  14 , the assistant ratchet that is reverse to the master ratchet is formed. When the master ratchet rotates anticlockwise and drives the rod  11  to rotate anticlockwise, the assistant ratchet idles because of the reversing. When the master ratchet rotates clockwise, the master ratchet idles while the assistant ratchet drives the rod  11  to rotate anticlockwise after being reversed via the holding ring  14 . Thus it is realized that the rod  11  rotates in one direction no matter a clockwise or anticlockwise torque is applied to the first ring gear  1221  by rotating the handle  13 , when the holding ring  14  is held to keep the planet carrier  1224  still. 
         [0127]    The transmission ratio of the speed increasing planet gear unit is equal to the gear ratio between the first ring gear  1221  and the planet gear  1222 . In the embodiment, the transmission ratio is 3. When the handle  13  rotates clockwise, the rod  11  which is coaxially arranged with the main shaft  126  rotates clockwise at the same speed. When the handle  13  rotates anticlockwise, the rod  11  which is coaxially arranged with the main shaft  126  rotates clockwise at triple the speed. 
         [0128]    The speed increasing bidirectional mechanical converter in the embodiment further includes a switching means, which is used for switching the functioning directions of the first one-way clutch  1231  and the second one-way clutch  1232 . 
         [0129]    As shown in  FIG. 10 , the switching means includes a switching shaft  121 , a spiral groove  1211  arranged on the switching shaft  121  and a push button  127  one end of which is arranged in the spiral groove  1211 . As shown in  FIG. 7 , the push button  127  is arranged in a long hole of the main shaft  126 . The button cover  15  is sheathed outside the main shaft  126 . When the button cover  15  moves axially along the main shaft  126 , it drives the push button  127  to move axially in the long hole of the main shaft  126  along the main shaft  126 . The one end of the push button  127  moves along the spiral groove  1211  to enable the switching shaft  121  to rotate, to drive the first one-way clutch  1231  and the second one-way clutch  1232  to rotate relative to the pin  1261 . Thus the functioning directions of the first one-way clutch  1231  and the second one-way clutch  1232  are reversed. 
         [0130]    As shown in  FIG. 11 , two curved concaves are arranged on the inner side of the main shaft  126 . A blind hole is arranged to the switching shaft  121 . A spring is arranged in the blind hole. A ball is arranged at the opening of the blind hole. After the rotation of the switching shaft  121 , the ball engages in the curved concaves, to keep the functioning directions of the first one-way clutch  1231  and the second one-way clutch  1232  stable during the use of the screwdriver. 
         [0131]    The screwdriver in the embodiment utilizes the technical feature that in the speed increasing planet gear unit the first ring gear  1221  and the sun gear  1223  rotates in opposite directions, and makes the first ring gear  1221  and the sun gear  1223  to drive the main shaft  126  respectively via the first one-way clutch  1231  and the second one-way clutch  1232  with same functioning directions, to realize the reverse of the directions. The rod  11  rotates in a preset direction no matter the handle  13  rotates clockwise or anticlockwise. When the handle  13  rotates in the same direction as the preset direction, the rod  11  and the handle  13  rotate in the preset direction at a same speed. When the handle  13  rotates in the opposite direction to the preset direction, the rod  11  rotates in the preset direction at triple the speed of the handle  13 . The switching means is for reversing the preset direction. 
         [0132]      FIG. 12  is a front view of a wrench including a speed increasing bidirectional mechanical converter in another embodiment of the present invention.  FIG. 13  is a part sectional view of the wrench shown in  FIG. 12 . As shown in  FIGS. 12 and 13 , the wrench including the speed increasing bidirectional mechanical converter in the embodiment includes: a switching knob  227 , a holding means, a speed increasing bidirectional mechanical converter, a handle  23  and a torque outputting part  21 , wherein the holding means is a holding ring  24  which is a conical ring. 
         [0133]    As shown in  FIG. 14 , the speed increasing bidirectional mechanical converter includes a main shaft  226 , a speed increasing planet gear unit and a reversing means, wherein the main shaft  226  and the torque outputting part  21  are arranged coaxially. 
         [0134]    The speed increasing planet gear unit includes a first ring gear  2221 , a planet gear  1222 , a sun gear  2223  and a planet carrier  2224 , wherein the planet gear  2222  is mounted on the planet carrier  2224 , the planet gear  2222  is arranged between the first ring gear  2221  and the sun gear  2223 , and the first ring gear  2221  rotates in an opposite direction against the sun gear  2223 . 
         [0135]    The reversing means includes a first one-way clutch  2231  and a second one-way clutch  2232  with same functioning directions. The functioning directions are same with a preset direction, i.e. the direction the main shaft  226  rotates in. 
         [0136]    The speed increasing bidirectional mechanical converter in the embodiment utilizes the technical feature that in the speed increasing planet gear unit the first ring gear  2221  and the sun gear  2223  rotate in opposite directions, and makes the first ring gear  2221  and the sun gear  2223  to drive the main shaft  226  respectively via the first one-way clutch  2231  and the second one-way clutch  2232  with same functioning directions, to realize the reverse of the directions. The main shaft  226  rotates in the preset direction no matter a clockwise or anticlockwise torque is applied to the first ring gear  2221 . 
         [0137]    The speed increasing bidirectional mechanical converter further includes a second ring gear  224  which is coaxially arranged with the first ring gear  2221  and connected to the first one-way clutch  2231 . This enables the first ring gear  2221  to drive the main shaft  226  via the first one-way clutch  2231 . In the embodiment, the first ring gear  2221  and the second ring gear  224  are non-integrated and connected coaxially. 
         [0138]    The speed increasing bidirectional mechanical converter further includes a third ring gear  225  which is coaxially arranged with the sun gear  2223  and connected to the second one-way clutch  2232 . This enables the sun gear  2223  to drive the main shaft  226  via the second one-way clutch  2232 . In the embodiment, the sun gear  1223  and the third ring gear  125  are integrated. 
         [0139]    The main shaft  226  is fixedly connected to the torque outputting part  21 . When the main shaft  226  rotates, it drives the torque outputting part  21  to rotate. 
         [0140]    In the embodiment, the first one-way clutch  2231  and the second one-way clutch  2232  are pawls. 
         [0141]    As shown in  FIG. 15 , the first one-way clutch  2231  includes a pair of pawls. Curved surface is arranged on the pawl&#39;s side facing the switching shaft  221 . A through hole is arranged in the switching shaft  221 . A spring is arranged in the through hole. Two ball plungers are arranged at the two openings of the through hole respectively and engaged to the curved surface on the pawls, forming the connection between the first one-way clutch  2231  and the switching shaft  221 . 
         [0142]    The first one-way clutch  2231  is mounted on the main shaft  226  via a pin. There are teeth on the two opposite sides of the first one-way clutch  2231 . At the position shown in  FIG. 15 , the teeth on one side of the first one-way clutch  2231  engage with the second ring gear  224 , and when the second ring gear  224  rotates clockwise, the main shaft  226  is driven to rotate clockwise because the first ring gear  2221  and the second ring gear  224  are connected coaxially. That is to say, the first ring gear  2221  drives the main shaft  226  to rotate clockwise. When the second ring gear  224  rotates anticlockwise, the first one-way clutch  2231  disengages with second ring gear  224 , thus cannot drive the main shaft  226  to rotate. The second ring gear  224  idles relative to the main shaft  226 . That is to say, the first ring gear  2221  idles relative to the main shaft  226 . 
         [0143]    As shown in  FIG. 16 , the second one-way clutch  2232  includes a pair of pawls. Curved surface is arranged on the pawl&#39;s side facing the switching shaft  221 . A through hole is arranged in the switching shaft  221 . A spring is arranged in the through hole. Two ball plungers are arranged at the two openings of the through hole respectively and engaged to the curved surface on the pawls, forming the connection between the second one-way clutch  2232  and the switching shaft  221 . 
         [0144]    The second one-way clutch  2232  is mounted on the main shaft  226  via a pin. There are teeth on the two opposite sides of the second one-way clutch  2232 . At the position shown in  FIG. 16 , the teeth on one side of the second one-way clutch  2232  engage with the third ring gear  225 , and when the third ring gear  225  rotates clockwise, the main shaft  226  is driven to rotate clockwise because the sun gear  2223  and the third ring gear  225  are integrated. That is to say, the sun gear  2223  drives the main shaft  226  to rotate clockwise. When the third ring gear  225  rotates anticlockwise, the second one-way clutch  2232  disengages with third ring gear  225 , thus cannot drive the main shaft  226  to rotate. The third ring gear  225  idles relative to the main shaft  226 . That is to say, the sun gear  2223  idles relative to the main shaft  226 . 
         [0145]    At the position shown in  FIGS. 15 and 16 , the functioning directions of the one-way clutches  2231  and  2232  are clockwise. That is to say, in the ring gears  224  and  225  which engage with the one-way clutches  2231  and  2232 , only the one rotates clockwise can drive the main shaft  226  to rotate clockwise. That is to say, the preset direction is same with the functioning directions of the one-way clutches  2232  and  2232 , which is clockwise. 
         [0146]    The handle  13  is used for inputting torque. 
         [0147]    As shown in  FIG. 17 , the second ring gear  224  is arranged in the handle  23  and they are integrated. Three curved concave parts are arranged along the circular inner side of the second ring gear  224  which is facing the first ring gear  2221 . As shown in  FIG. 14 , the three curved concave parts are engaged with the three convex parts on the side of the first ring gear  2221  which is facing the second ring gear  224 , forming the coaxial connection between the second ring gear  224  and the first ring gear  2221 . 
         [0148]    Other coaxial connection between the second ring gear  224  and the first ring gear  2221  can be adopted, which is not limited by the present invention. 
         [0149]    The holding ring  24  is used for keeping the planet carrier  2224  still. 
         [0150]    In the embodiment, the holding ring  24  and the planet carrier  2224  are non-integrated and fixedly connected. 
         [0151]    When use the wrench of the embodiment, hold the holding ring  24  to keep the planet carrier  2224  still, rotate the handle  23  clockwise to apply a clockwise torque to the second ring gear  225 , enabling the first ring gear  2221  rotates clockwise. As shown in  FIG. 16 , the second ring gear  225  drives the main shaft  226  to rotate clockwise, the first ring gear  2221  drives the sun gear  2223  to rotate anticlockwise via the planet gear  2222 , enabling the third ring gear  224  to rotate anticlockwise. As shown in  FIG. 15 , the third ring gear  224  idles relative to the main shaft  226 . That is to say, the sun gear  2223  idles relative to the main shaft  126 . 
         [0152]    When use the wrench of the embodiment, hold the holding ring  24  to keep the planet carrier  2224  still, rotate the handle  23  anticlockwise to apply an anticlockwise torque to the second ring gear  225 , enabling the first ring gear  2221  rotates anticlockwise. As shown in  FIG. 16 , the second ring gear  225  idles relative to the main shaft  126 , the first ring gear  2221  drives the sun gear  2223  to rotate clockwise at an increased speed via the planet gear  2222 , enabling the third ring gear  224  to rotate clockwise. As shown in  FIG. 15 , the third ring gear  224  drives the main shaft  226  to rotate clockwise. That is to say, the sun gear  2223  drives the main shaft  126  to rotate clockwise. 
         [0153]    The transmission ratio of the speed increasing planet gear unit is equal to the gear ratio between the first ring gear  2221  and the planet gear  2222 . In the embodiment, the transmission ratio is 3. When the handle  23  rotates clockwise, the torque outputting part  21  which is coaxially arranged with the main shaft  226  rotates clockwise at the same speed. When the handle  23  rotates anticlockwise, the torque outputting part  21  which is coaxially arranged with the main shaft  226  rotates clockwise at triple the speed. 
         [0154]    The speed increasing bidirectional mechanical converter in the embodiment further includes a switching means, which is used for switching the functioning directions of the first one-way clutch  2231  and the second one-way clutch  2232 . 
         [0155]    The switching means includes a switching shaft  221  and a switching knob  227  arranged on the switching shaft  221 . Rotate the switching knob  227 , the switching shaft  221  is driven to rotate, driving the first one-way clutch  2231  and the second one-way clutch  2232  to rotate relative to the pin. Thus the functioning directions of the first one-way clutch  2231  and the second one-way clutch  2232  are reversed. 
         [0156]    The wrench in the embodiment further includes an unlocking means, which includes a ball arranged on the torque outputting part  21 , the switching knob  227 , a spring  26 , and a first groove  2212  and a second groove  2213  which are arranged in the switching shaft  221 . As shown in  FIG. 18 , the first groove  2212  and the second groove  2213  have different depths. The ends of the first groove  2212  and the second groove  2213  which are closer to the switching knob  227  have deeper depths. 
         [0157]    When the switching knob  227  is pushed down, the ball enters the deeper part of the first groove  2212  or the second groove  2213  and the unlocking is achieved. When the switching knob  227  is released, the elastic force provided by the sheathed spring  26  restores the switching knob  227  to its original position and enable the ball to move to the shallower part and bounce up. 
         [0158]    The wrench in the embodiment utilizes the technical feature that in the speed increasing planet gear unit the first ring gear  2221  and the sun gear  2223  rotates in opposite directions, and makes the first ring gear  2221  and the sun gear  2223  to drive the main shaft  226  respectively via the one-way clutches  1231  and  1232  with same functioning directions, to realize the reverse of the directions. The torque outputting part  21  rotates in the preset direction no matter the handle  23  rotates clockwise or anticlockwise. When the handle  23  rotates in the same direction as the preset direction, the torque outputting part  21  and the handle  23  rotate in the preset direction at a same speed. When the handle  23  rotates in the opposite direction to the preset direction, the torque outputting part  21  rotates in the preset direction at triple the speed of the handle  23 . The switching means is for reversing the preset direction. 
         [0159]    What illustrated above are preferred embodiments of the present invention. It should be understood that persons skilled in the art can make many modifications and changed in accordance with the concept of the invention without creative work. So any technical solutions obtained through logical analyzing, reasoning or limited experiments in accordance with the concept of the present invention by the persons skilled in the art shall fall within the scope of the claims.