Drive shaft for an elevator system
AssigneeTK Elevator Innovation and Operations GmbH
InventorJakub Rosenthal
Life of this patent
Estimating the term…
Abstract
A drive shaft for an elevator system, includes a support shaft and a traction sheave with at least one traction face for driving a traction mechanism, for example a drive belt, of the elevator system. A connection is provided for the transmission of a drive torque from the support shaft to the traction sheave, the traction sheave being of separate configuration from the support shaft. The traction sheave is held with an inner guide face on an outer guide face of the support shaft. The connection includes at least one axially projecting traction sheave-side circumferential stop which is in positively locking engagement with a support shaft-side circumferential stop.
Claims14
A drive shaft for an elevator system, comprising:
- a support shaft having an outer guide face;
- at least one support shaft-side circumferential stop, defined in or extending from an axially-directed face of said support shaft, that is configured to impart a circumferentially directed rotational drive force during axial rotational movement of said support shaft;
- a traction sheave having an inner guide face, and a traction face configured to drive a traction mechanism of the elevator system, said traction sheave being concentrically disposed on said support shaft about a central axis such that said inner guide face of said traction sheave is positioned against said outer guide face of said support shaft;
- and
- at least one traction sheave-side circumferential stop extending from or defined in an axially-directed face of said traction sheave in an axial direction of the central axis, and disposed in a complementary positive locking engagement with said at least one support shaft-side circumferential stop, such that a circumferentially-directed side face of said at least one traction sheave-side circumferential stop constantly abuts a complimentary circumferentially-directed side face of said at least one support shaft-side circumferential stop, so as to enable said support shaft to transmit a drive torque from said support shaft to said traction sheave via said abutting side faces of said circumferential stops,
- wherein a ratio W/L of a wall thickness W of said traction sheave and an axial length L of said traction face is at most 0.5.
An elevator system, comprising:
- a drive shaft, comprising,
- a support shaft having an outer guide face,
- at least one support shaft-side circumferential stop, defined in or extending from an axially-directed face of said support shaft, that is configured to impart a circumferentially directed drive force during axial rotational movement of said support shaft,
- a traction sheave having an inner guide face, and a traction face configured to drive a traction mechanism of the elevator system, said traction sheave being concentrically disposed on said support shaft about a central axis such that said inner guide face of said traction sheave is positioned against said outer guide face of said support shaft, and
- at least one traction sheave-side circumferential stop extending from or defined in an axially-directed face of said traction sheave in an axial direction of the central axis, and disposed in a complimentary positive locking engagement with said at least one support shaft-side circumferential stop, such that a circumferentially-directed side face of said at least one traction sheave-side circumferential stop constantly abuts a complimentary circumferentially-directed side face of said at least one support shaft-side circumferential stop, so as to enable said support shaft to transmit a drive torque from said support shaft to said traction sheave via said abutting side faces of said circumferential stops,
- wherein a ratio W/L of a wall thickness W of said traction sheave and an axial length L of said traction face is at most 0.5.
Dependencies are inferred from the claim text.