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Encyclopedia > Torque tube

A torque tube system is an automobile driveshaft technology, used in cars with a front engine and rear drive. It is not as widespread as the Hotchkiss drive, but is still occasionally used to this day. A small variety of cars, the most popular kind of automobile. ... A driveshaft or driving shaft is a mechanical device for transferring power from the engine or motor to the point where useful work is applied. ... The dominant form of power transmission for front-engine, rear-drive cars in the twentieth century is called the Hotchkiss drive. ...

The "torque" that is referred to in the name is not that of the driveshaft, along the axis of the car, but that applied by the wheels, which must be transmitted to the frame by the suspension. The suspension of a Hotchkiss drive can transmit this torque; other suspension systems cannot use its driveshaft without additional suspension members. The cheapest system to do this (including the cost of suspension) is by means of a torque tube; the most expensive, a fully-independent rear suspension with trailing arms. The dominant form of power transmission for front-engine, rear-drive cars in the twentieth century is called the Hotchkiss drive. ...

A torque tube is a hollow steel tube that extends from the transmission to the rear differential and axle. The rear end is bolted directly to the differential, where a Hotchkiss drive would have used a universal joint. The front is attached to the transmission with a "torque ball". The driveshaft, which transmits power and torque from the transmission to the differential, resides inside the torque tube. A single universal joint, located inside the torque ball, allows the driveshaft to flex slightly. The concept of torque in physics, also called moment or couple, originated with the work of Archimedes on levers. ... In mechanics, a transmission or gearbox is the gear and/or hydraulic system that transmits mechanical power from a prime mover (which can be an engine or electric motor), to some form of useful output device. ... In this differential, input torque is applied to the ring gear (blue). ... An axle is a central shaft for a rotating wheel or gear. ... A universal joint, U joint or Cardan joint is a joint in a rigid rod that allows the rod to bend in any direction. ...

Drive thrust is transmitted through the torque tube to the transmission, engine, and frame. In contrast, a Hotchkiss system transmits this thrust to the frame at the rear differential.

Examples of the torque tube were the American cars of the Ford brand up through 1948, which used the cheaper transverse springs that could not take the thrust. Buick started using coil springs in the 1930's, as did Nash's post-war Airflyte model; these also necessitated using a torque tube.

  Results from FactBites:
United States Patent Application: 0040115040 (2835 words)
A torque tube assembly as set forth in claim 13 wherein the torque tube assembly is adapted for use in an aircraft engine and the torque tube axis extends perpendicular to the outside edge of the interior surface of the housing during steady state cruise operation of the engine.
The torque tube assembly comprises an elongate torque tube having an inner end adapted for connection to the variable stator vane bell crank, an outer end adapted for connection to the variable stator vane actuator, and a longitudinal axis extending between the inner end and the outer end.
The torque tube assembly 20 transmits torque from the actuator 32 to the bell crank 30 to vary the pitch of stator vanes 34 connected to the bell crank.
Patent 5880547: Internal torque tube for superconducting motor (3344 words)
Tubes are usually formed of stainless steel and have a wall thickness and radius which are sufficient to withstand shaft torque.
To this end, each tube may also include first and second metal plate ends which bolt axially to the shaft and support, overlap the composite member axially over a connection distance and radially either internally or externally of the member wall and are bolted radially to the member wall over the connection distance.
Tube 48 is generally cylindrical, formed of stainless steel, hollow, and is sized so that it fits within member 60 with a radial air gap 80 therebetween.
  More results at FactBites »



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