Door locking device

A door locking device, comprising:

• a lock switch member adapted to be built in a door of a vehicle, and adapted to rotate between a lock position locking the door and an unlock position unlocking the door when receiving a force from a lock operation portion provided at a vehicle interior side of the door or from an electric drive source built in the door;
• a key operation transmission member adapted to rotate between a key lock position and a key unlock position when receiving a key operation force relative to a key cylinder provided at the door, the key operation transmission member transmitting the key operation force to the lock switch member so that, in a case where the key operation transmission member rotates to the key lock position, the lock switch member is rotated to the lock position in a cooperating manner, whereas, in a case where the key operation transmission member rotates to the key unlock position, the lock switch member is rotated to the unlock position in the cooperating manner, the key operation transmission member arranged to rotate about a common rotation axis which is shared with the lock switch member;
• a pair of first fan-shaped protruding portions rotating integrally with a first member corresponding to one of the lock switch member and the key operation transmission member, and provided at two positions which are away from each other by 180 degrees around the common rotation axis thereof;
• and
• a pair of second fan-shaped protruding portions rotating integrally with a second member corresponding to the other one of the lock switch member and the key operation transmission member, the pair of second fan-shaped protruding portions being provided at two positions which are away from each other by 180 degrees around the common rotation axis thereof and arranged alternately with the first fan-shaped protruding portions around the common rotation axis in a manner that a predetermined rotation clearance is interposed relative to the first fan-shaped protruding portions, the pair of second fan-shaped protruding portions transmitting the key operation force between the second fan-shaped protruding portions and the first fan-shaped protruding portions in a case where the key operation transmission member is rotated to the key lock position, so that the lock switch member is rotated to the lock position in a cooperating manner, the pair of second fan-shaped protruding portions transmitting the key operation force between the second fan-shaped protruding portions and the first fan-shaped protruding portions in a case where the key operation transmission member is rotated to the key unlock position, so that the lock switch member is rotated to the unlock position in the cooperating manner, wherein
• the first fan-shaped protruding portions rotate relative to the second fan-shaped protruding portions in a range of the rotation clearance between the first fan-shaped protruding portions and the second fan-shaped protruding portions, and a transmission of a force from the lock switch member to the key operation transmission member is configured to be interrupted even in a case where the lock switch member is rotated to any one of the lock position and the unlock position in a state where the key operation transmission member is positioned at a neutral position which is positioned intermediately between the key lock position and the key unlock position, whereas the second fan-shaped protruding portions rotate relative to the first fan-shaped protruding portions beyond the rotation clearance between the second fan-shaped protruding portions and the first fan-shaped protruding portions and thus the key operation force is configured to be transmitted from the key operation transmission member to the lock switch member in a case where the key operation transmission member is rotated from the neutral position to the key lock position and to the key unlock position, the door locking device further comprising:
• a torque transmission shaft provided at the second member and extending in an axial direction of the common rotation axis, the torque transmission shaft including the pair of second fan-shaped protruding portions at a distal end surface and including a circular-shaped outer circumferential surface which is flush with an outer circumferential surface of the pair of second fan-shaped protruding portions;
• a circular-shaped recessed portion formed to be recessed at the first member, the circular-shaped recessed portion including a circular-shaped inner circumferential surface, the pair of first fan-shaped protruding portions protruding from part of the circular-shaped inner circumferential surface, the circular-shaped recessed portion receiving the pair of second fan-shaped protruding portions;
• a center hole formed at a center of an inner-most wall of the circular-shaped recessed portion so as to pass therethrough;
• a distal end shaft protruding from a center of the distal end surface of the torque transmission shaft farther than the pair of second fan-shaped protruding portions and passing through the center hole;
• a lock protrusion protruding laterally from a distal end portion of the distal end shaft, being locked at an outer side opening edge of the center hole and restricting the distal end shaft from coming off the center hole;
• a support cylinder rotatably supporting an intermediate portion of the torque transmission shaft in an axial direction thereof;
• and
• a large diameter portion at which a diameter of a base end portion of the torque transmission shaft is increased in a stepped configuration, the large diameter portion facing the first member with interposing the support cylinder between the large diameter portion and the first member in the axial direction of the common rotation axis.