Electric cable drive device and electric brake device

Abstract

An cable drive device ( 10 ) having a motor (M), a speed reducer (G), a nut member ( 26 ) connected to the speed reducer, a rod ( 32 ) screwed to the nut member ( 26 ) and guided by a guide member ( 34 ) so as not to rotate, a control cable ( 15 ) composed of an inner cable ( 45 ) connected to the rod and a guide tube ( 49 ) for guiding the inner cable, a sensor for detecting the amount of operation of the cable based on the amount of rotation of the speed reducer (G), and a load sensor ( 17 ) for detecting a load applied to the cable. An electric brake device can be obtained by connecting the control cable and a brake mechanism of the cable drive device ( 10 ).

1 . An electric cable drive device, comprising:
 a motor;   a speed reducer connected to an output shaft of the motor;   a rotating member connected to an output shaft of the speed reducer;   a linear motion member converting a rotation of the rotating member into a linear motion of a linear motion member, screwing together with the rotating member;   a cable connected to the linear motion member;   an emergency release mechanism releasing an operating physical force of the cable by an external operation;   wherein the emergency release mechanism comprises a constraining mechanism which constrains the rotating means so as not to move axially in a normal condition, and release the constraint by an external operation in an abnormal condition.   
     
     
         2 . An electric cable drive device according to  claim 1 , wherein the constraining mechanism comprises a catching mechanism which is disposed so as to face an end of the rotating member, and receives and constrains the rotating member when its end is pressed against the constraining mechanism, and constrains the rotating member until being released by an external operation when its end is inversely pressed against the constraining mechanism. 
     
     
         3 . An electric cable drive device, comprising:
 a motor;   a speed reducer connected to an output shaft of the motor;   a rotating member connected to an output shaft of the speed reducer;   a linear motion member converting a rotation of the rotating member into a linear motion of a linear motion member, screwing together with the rotating member;   a control cable having an inner cable connected to the linear motion member and a guide tube supporting a reactive force of the inner cable; and   an emergency release mechanism releasing the operating physical force of the inner cable by an external operation;   wherein the emergency release mechanism comprises a constraining mechanism constraining an end of the guide tube so as not to move axially in a normal condition, and releasing the constraint by an external operation in an abnormal condition; and a releasing operation means releasing the constraint by an external operation.   
     
     
         4 . An electric cable drive device according to  claim 3 , wherein the constraining mechanism comprises a bracket supporting an end of the guide tube; an engaging member moving between a constraining position which disturbs the movement by engaging with the bracket and a releasing position releasing the constraint by an external operation; and a spring which energize the engaging member to the side of constraining position; and wherein the releasing operation means operates the engaging member toward the releasing position opposing the energized spring force. 
     
     
         5 . An electric cable drive device according to  claim 4 , wherein the engaging member is provided as one pair tucking the centerline of the guide tube. 
     
     
         6 . An electric cable drive device according to  claim 4 , wherein the releasing operation means comprises a releasing cable which transmits a tensile force. 
     
     
         7 . An electric cable drive device according to  claim 1 , wherein the control cable is a pull control cable operating a brake, and wherein a tension by a return spring of the brake is always applied to the inner cable of the pull control cable. 
     
     
         8 . An electric cable drive device according to  claim 3 , wherein the control cable is a pull control cable operating a brake, and wherein a tension by a return spring of the brake is always applied to the inner cable of the pull control cable. 
     
     
         9 . A cable drive device according to  claim 1 , wherein the cable operates the parking brake of automobiles. 
     
     
         10 . A cable drive device according to  claim 3 , wherein the cable operates the parking brake of automobiles. 
     
     
         11 . A cable drive device according to  claim 9 , wherein an equalizer is connected to the linear motion member directly or via a cable and one pair of the second cable operating the right and left brake is connected to the both end of the equalizer, and wherein the second cable have a guide tube and an inner cable respectively and is installed roughly symmetrically. 
     
     
         12 . A cable drive device according to  claim 10 , wherein an equalizer is connected to the linear motion member directly or via a cable and one pair of the second cable operating the right and left brake is connected to the both end of the equalizer, and wherein the second cable have a guide tube and an inner cable respectively and is installed roughly symmetrically. 
     
     
         13 . A cable drive device according to  claim 1 , wherein the rotating member of the transducer comprises a female screw and the linear motion member is a male screw screwing together with the female screw of the rotating member. 
     
     
         14 . A cable drive device according to  claim 3 , wherein the rotating member of the transducer comprises a female screw and the linear motion member is a male screw screwing together with the female screw of the rotating member. 
     
     
         15 . A cable drive device according to  claim 1 , wherein the rotating member of the transducer is a male screw and the linear motion member is a nut member to screw together with the male screw. 
     
     
         16 . A cable drive device according to  claim 3 , wherein the rotating member of the transducer is a male screw and the linear motion member is a nut member to screw together with the male screw. 
     
     
         17 . An electrical parking brake device for automobiles etc. comprising;
 the cable drive device according to  claim 1 ,   a brake lever to which the cable of the brake device or the inner cable is connected;   the spring energizing the brake lever to the release side of the brake; and   a friction member for the brake connected to the brake lever.   
     
     
         18 . An electrical parking brake device for automobiles etc. comprising;
 the cable drive device according to any of the  claims 3 ,   a brake lever to which the cable of the brake device or the inner cable is connected;   the spring energizing the brake lever to the release side of the brake; and   a friction member for the brake connected to the brake lever.