US 12,110,927 B2
Torque transmission shaft
Seiichi Moriyama, Maebashi (JP); and Keisuke Nakao, Maebashi (JP)
Assigned to NSK Ltd., Tokyo (JP)
Appl. No. 17/425,163
Filed by NSK Ltd., Tokyo (JP)
PCT Filed Jan. 22, 2020, PCT No. PCT/JP2020/002151
§ 371(c)(1), (2) Date Jul. 22, 2021,
PCT Pub. No. WO2020/153408, PCT Pub. Date Jul. 30, 2020.
Claims priority of application No. 2019-009011 (JP), filed on Jan. 23, 2019.
Prior Publication US 2022/0120319 A1, Apr. 21, 2022
Int. Cl. F16D 1/08 (2006.01); F16D 1/068 (2006.01); F16D 1/072 (2006.01)
CPC F16D 1/0864 (2013.01) [F16D 1/068 (2013.01); F16D 1/072 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A torque transmission shaft, comprising:
a shaft having a hollow cylindrical shape and including: a male serration provided on an outer circumferential surface of one end portion in an axial direction; a slit provided in the other end portion in the axial direction, extending in the axial direction, and having a closed end on one side in the axial direction and an open end on the other side in the axial direction; a fitting cylinder portion provided in the other end portion in the axial direction; and a female serration provided on an inner circumferential surface of the other end portion in the axial direction;
and a clamp having an incomplete cylindrical shape and including: a discontinuous portion arranged at one place in a circumferential direction; a pair of flange portions arranged on both sides in the circumferential direction of the discontinuous portion and having mounting holes into which a tightening member can be inserted; a connecting portion having a partially cylindrical shape and connecting the pair of flange portions in the circumferential direction; and an insertion hole into which the fitting cylinder portion is inserted;
wherein the clamp is externally fitted onto the fitting cylinder portion and is able to reduce a diameter of the fitting cylinder portion by narrowing a width dimension of the discontinuous portion,
wherein the female serration is provided only on an inner circumferential surface of the fitting cylinder portion, and one end portion in the axial direction of the slit is located on the one side in the axial direction from the fitting cylinder portion, and is located at a portion having an outer diameter dimension and an inner diameter dimension larger than the fitting cylinder portion, and
wherein the shaft has a conical cylinder portion in a portion adjacent to the one side in the axial direction of the fitting cylinder portion having an outer diameter dimension and inner diameter dimension that become larger as going toward the one side in the axial direction, and the one end portion in the axial direction of the slit is located on the one side in the axial direction from the conical cylinder portion.