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An Electrically Aided Bendix Brake

2nd December 1932
Page 68
Page 68, 2nd December 1932 — An Electrically Aided Bendix Brake
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A Résumé of Recently Published Patent Specifications

TEE name of the Bendix Brake Company, of America, appears in patent No. 382,338. This relates to a brake which is assisted by power derived from a starter motor. As will be seen from the drawing, the motor is mounted in the usual manner, but•its shaft is continued to the bearing shown on the right

When the starter motor rotates in the usual direction for starting the engine, the free-wheel clutch (48) permits the worm (60) to remain still. When, however, the electric motor is rotated in a reverse direction the worm (60) comes into operation to rotate the worm wheel in the direction of the arrow. The worm wheel is free to turn in the hollow brake shaft and has a recessed part to receive the coil spring (70), one end of which is operated by a lever (88), whilst the other end 4s operated by another lever (84).

An electric switch is mounted in the pedal plate of the brake lever, so that when the pedal is depressed contact is made which causes the electric motor to rotate in a reverse direction to that required for starting. This brings into operation the free-wheel dutch and causes the worm wheel to rotate. A further pressure on the pedal has the effect of expanding the spring (70) so that it sets up frictional contact with the rotating worm wheel, thus assisting the driver in applying the brake. By this arrangement a driver can feel what pressure he is exerting, and should the electric motor fail by any chance he can still apply his brake in the usual manner, as the worm (60) can slide along its shaft and can disengage itself from the claw clutch, so becoming inoperative.

'A Timken Bearing for Heavy Duty.

IN patent No. 382,598 appears the name of The Timken Roller Bearing Company, of America. It describes a double-roller bearing designed for extra heavy duty. As will be seen from the drawing, the inner member has two conical parts, the small ends facing each other. This part is made in one piece and is provided t„.. with holes to allow 14

lubricant to find its4.7-rf 9 way to the rollers

from inside.'

The outer ring is formed of two parts which, when fully assembled, are held apart by means of an intermediate ring which is made in halves. The rollers are drilled through to permit of pins passing through them to form the cage. The outer ring of each cage can be of one piece, but the inner rings must be made in halves to allow them to pass over the larger ends of the inner member.

The method of assembly is as follows :—One set of rollers with its outer member can be put in place, the pins for the rollers being screwed into the inner ring of the cage. The other outer ring can then be slipped on first having put the divided inner ring of the cage in place. The rollers are then introduced and the outer ring of their cage assembled with the pins. After, this, the outer cone is brought over the rollers and the interposing ring put on and secured by means of screws which hold the halves together.

A Turbine Variable Gear.

ONE of the latest developments of fluid transmission is

that described in patent No. 382,433, by Aktiebolaget Ljungstroms Angturbin, of Vastra Teadgardsgatan 17, Stockholm, Sweden. In this device the variation of speed is obtained by varying the angle of the blades of the pump member. •

The drawing shows a shaft (18) and a pair of gears, which for clearness may be disregarded, and an extension of the hollow shaft (3), which may be connected to the motor from which power is derived. To this hollow shaft the disc (4) is keyed, and this disc carries the bolts which form the pivots on which the blades (5) of the pump

member hinge, their variable angle being brought about by means of the disc (31), keyed to the inner shaft (20).

A quick-pitch spiral is cut on the left-hand end of the inner shaft, and a sliding nut (22) is capable of transmitting a slight rotary movement of this shaft in relation to the hollow shaft (3) and the fulcrum-bearing disc (4).

The right-hand figure makes it plain how this slight relative rotary movement alters the angle of the pump blades (5) to cause them to throw more or less fluid, and so vary the speed of the driven shaft (7) in relation to the driving shaft.

The flow of fluid through the pump, stators and rotors is as follows :—From the central space the fluid flows through the pump blades (5), then through the moving blades (12) and, following the arrow, through the stator blades (13), past the moving blades (11) and the stator blades (14) to the moving blades (9), thus completing the circular path through which it moves. For clearness we have shaded the stator blades. The lever (26) regulates the angle at which the pump blades operate.

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Locations: Stockholm

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