Rotary guiding tool and transmission device

Abstract

The present invention provides a rotary guiding tool, comprising: a power unit having an output shaft capable of outputting a torque and an offset driving portion capable of outputting a radial force and/or an axial force; a transmission shaft connected with the output shaft; a support shaft connected with the transmission shaft through a rotation structure, wherein a rotation axis of the rotation structure is perpendicular to an axis of the output shaft, the support shaft has an inner wall defining an accommodating cavity and a forward end and a rearward end formed at both ends of the accommodating cavity, a rotation center of the rotation structure is located in the accommodating cavity, and the rearward end of the support shaft is capable of being driven by the radial force output by the offset driving portion; and a drill bit having a drill bit tail end, wherein the drill bit and the forward end of the support shaft are connected to the drill bit tail end. According to the present invention, the rotary guiding tool may improve the whipstocking ability of the drilling tool, and reduce the energy consumption of driving the drilling tool.

1 - 10 . (canceled) 
     
     
         11 . A rotary guiding tool, wherein, comprising:
 a power unit having an output shaft capable of outputting a torque and an offset driving portion capable of outputting a radial force and/or an axial force;   a transmission shaft connected with the output shaft;   a support shaft connected with the transmission shaft through a rotation structure, a rotation axis of the rotation structure is perpendicular to an axis of the output shaft, the support shaft has   an inner wall defining an accommodating cavity, and a forward end and a rearward end formed at both ends of the accommodating cavity, a rotation center of the rotation structure is located in the accommodating cavity, and the rearward end of the support shaft is capable of being driven by the radial force output by the offset driving portion; and   a drill bit having a drill bit tail end, the drill bit and the forward end of the support shaft are connected to the drill bit tail end.   
     
     
         12 . The rotary guiding tool of  claim 11 , wherein, the rotation structure comprises a rotation joint that forms a spherical pair with the support shaft, and a flexible member that passes through the rotation joint and is connected with the support shaft. 
     
     
         13 . The rotary guiding tool of  claim 12 , wherein, the rotation joint comprises a first protrusion proximal to the forward end of the support shaft and having a first truncated spherical surface portion, the support shaft has a first groove, and the first groove and the first protrusion cooperate at the first truncated spherical surface portion to form a spherical pair. 
     
     
         14 . The rotary guiding tool of  claim 13 , wherein, a surface hardness of the first groove is greater than a surface hardness of the first protrusion. 
     
     
         15 . The rotary guiding tool of  claim 13 , wherein, the rotation joint further comprises a pair of connection keys arranged with a central axis of rotation of the transmission shaft as a symmetrical axis, the pair of connection keys are mounted on the rotation joint, and the support shaft is formed with a key slot cooperating with the connection keys;
 the connection key has a second protrusion, and a surface of the second protrusion is of a truncated cylindrical shape with a rotation axis of the rotation structure as a central axis.   
     
     
         16 . The rotary guiding tool of  claim 13 , wherein, the rotation joint further comprises a third protrusion formed at an end, distal from the forward end of the support shaft, of the connection key, the third protrusion has a second truncated spherical surface portion that is concentric with the first truncated spherical surface portion,
 the support shaft has a third groove, and the third groove and the third protrusion cooperate at a second cross section spherical surface portion to form a spherical pair.   
     
     
         17 . The rotary guiding tool of  claim 14 , wherein, the rotation joint further comprises a third protrusion formed at an end, distal from the forward end of the support shaft, of the connection key, the third protrusion has a second truncated spherical surface portion that is concentric with the first truncated spherical surface portion,
 the support shaft has a third groove, and the third groove and the third protrusion cooperate at a second cross section spherical surface portion to form a spherical pair.   
     
     
         18 . The rotary guiding tool of  claim 15 , wherein, the rotation joint further comprises a third protrusion formed at an end, distal from the forward end of the support shaft, of the connection key, the third protrusion has a second truncated spherical surface portion that is concentric with the first truncated spherical surface portion,
 the support shaft has a third groove, and the third groove and the third protrusion cooperate at a second cross section spherical surface portion to form a spherical pair.   
     
     
         19 . The rotary guiding tool of  claim 12 , wherein, an end of the flexible member is mounted on a fixed portion of the support shaft, the other end of the flexible member is supported by a support portion of the transmission shaft, and the rotation center of the rotation structure is located between the fixed portion and the support portion. 
     
     
         20 . The rotary guiding tool of  claim 13 , wherein, an end of the flexible member is mounted on a fixed portion of the support shaft, the other end of the flexible member is supported by a support portion of the transmission shaft, and the rotation center of the rotation structure is located between the fixed portion and the support portion. 
     
     
         21 . The rotary guiding tool of  claim 14 , wherein, an end of the flexible member is mounted on a fixed portion of the support shaft, the other end of the flexible member is supported by a support portion of the transmission shaft, and the rotation center of the rotation structure is located between the fixed portion and the support portion. 
     
     
         22 . The rotary guiding tool of  claim 15 , wherein, an end of the flexible member is mounted on a fixed portion of the support shaft, the other end of the flexible member is supported by a support portion of the transmission shaft, and the rotation center of the rotation structure is located between the fixed portion and the support portion. 
     
     
         23 . The rotary guiding tool of  claim 11 , wherein, further comprising an annular pressure balance portion connecting the inner wall of the support shaft and an outer wall of the transmission shaft, a portion of the inner wall of the support shaft, a portion of the outer wall of the transmission shaft and an inner surface of the pressure balance portion jointly define a medium cavity. 
     
     
         24 . The rotary guiding tool of  claim 12 , wherein, further comprising an annular pressure balance portion connecting the inner wall of the support shaft and an outer wall of the transmission shaft, a portion of the inner wall of the support shaft, a portion of the outer wall of the transmission shaft and an inner surface of the pressure balance portion jointly define a medium cavity. 
     
     
         25 . The rotary guiding tool of  claim 13 , wherein, further comprising an annular pressure balance portion connecting the inner wall of the support shaft and an outer wall of the transmission shaft, a portion of the inner wall of the support shaft, a portion of the outer wall of the transmission shaft and an inner surface of the pressure balance portion jointly define a medium cavity. 
     
     
         26 . The rotary guiding tool of  claim 14 , wherein, further comprising an annular pressure balance portion connecting the inner wall of the support shaft and an outer wall of the transmission shaft, a portion of the inner wall of the support shaft, a portion of the outer wall of the transmission shaft and an inner surface of the pressure balance portion jointly define a medium cavity. 
     
     
         27 . The rotary guiding tool of  claim 15 , wherein, further comprising an annular pressure balance portion connecting the inner wall of the support shaft and an outer wall of the transmission shaft, a portion of the inner wall of the support shaft, a portion of the outer wall of the transmission shaft and an inner surface of the pressure balance portion jointly define a medium cavity. 
     
     
         28 . The rotary guiding tool of  claim 11 , wherein, a shortest distance between the rotation center and the drill bit tail end is not greater than 3.5 times of a maximum radial dimension of the support shaft. 
     
     
         29 . A transmission device, separately connected to:
 a power unit having an output shaft capable of outputting a torque and an offset driving portion capable of outputting a radial force;   a drill bit having a drill bit tail end;   wherein, the transmission device comprises:   a transmission shaft coaxially connected with the output shaft;   a support shaft coaxially connected with the transmission shaft through a rotation structure, a rotation axis of the rotation structure is perpendicular to an axis of the output shaft, the support shaft has   an accommodating cavity and a forward end and a rearward end formed at both ends of the accommodating cavity, a rotation center of the rotation structure is located in the accommodating cavity, and the rearward end of the support shaft is capable of being driven by the radial force output by the offset driving portion, and the forward end and the drill bit are coaxially connected to the drill bit tail end.