Presentation on Hooke's joint

INTRODUCTION Two U-shaped yokes or forks which are integral with driving & driven shafts The cross, which is connecting link The arm of the cross are at right angles. The torque is transmitted from the driving shaft to the driven shaft through the cross.

An universal joint or Hooke's joint is used to connect non parallel and intersecting shafts having small intersecting angle. It is mainly used to transmit power from gear box to rear axle in automobile vehicles. The motion is transmitted from one shaft to another by the centre piece. The driving shaft rotates at uniform angular speed but the driven shaft rotates at continuously varying angular speed.

FEATURES OF HOOKE JOINT Practically maintenance free. Shield lubricated needle bearings . Provides precise positioning. Maintains low backlash. Operates continuously at high speeds.

TYPES OF HOOKE’S JOINT Single Hooke joint. Double hook joint.

SINGLE HOOKE JOINT

DOUBLE HOOKE JOINT

CHARACTERISTICS OF UNIVERSAL JOINT Speed variations :- While operating at an angle, U-joints speed up and slow down twice per revolution Joint phasing :- The vibrations caused by one U-joint are transmitted to the other one Cancelling angles :- The angle of the front U-joint is offset by the rear one. The correct angle must be maintained to minimize vibration

DOUBLE CARDAN JOINT Consists of two single U-joints joined by a centre yoke and a ball and socket.

PURPOSES OF DRIVE SHAFT Transmits power from the transmission to the differential. Allows the transmission and the rear axle assembly to be at different heights. Allows the rear axle to move up and down while maintaining a connection to the transmission.

FEATURES OF DRIVE SHAFT Can be made of steel, aluminium, or composite material May have cardboard liner to reduce noise Has a yoke welded to each end Universal joints are used to connect to pinion flange yoke and sleeve yoke May have balance weights attached

ADVANTAGES OF HOOKE'S JOINT High torque capacity Long bearing life High operating angle capability Heat treated alloy steel components Ideal loading across entire bearing length due to balanced deflection between yokes and cross High Shock and Overload Capacity Long Life

DISADVANTAGES It can not be used for high speed applications. In case of single Hooke’s joint, even if the driving shaft is rotating at constant speed, the driven shaft rotates with acceleration. this generate, the inertia torque on the driven shaft.

APPLICATIONS Coupling between the gear box and the differential of automobile. To transmit the drives to different spindles of multi spindles drilling machine. It is used to connect two non parallel and intersecting axis shafts, having small angle between two axis..