What is Front Axle and Stub Axle : Types & Functions

What Is Front Axle? – The front axle uses to carry the weight of the front part of the vehicle as well as to facilitate steering and absorb shocks due to road surface variations. It is made of I-section in center position while the ends are made either circular or elliptical with the construction.

INTRODUCTION

An axle is a central shaft for a rotating wheel or gear. A wheeled vehicle, the axle may be fixed to the wheels, rotating with them or attached to its surroundings with the wheel rotating around the axle. In the former case, bearings or bushes provide at the mounting points where the axle is supported.

For cars and trucks, the shaft itself rotates with the wheels, being bolted or splined in fixed relation to it, and is called an axle or axle shaft. However, it is genuinely the surrounding housing that is called an axle (or axle housing).

WHAT IS FRONT AXLE

What is Front Axle
What is Front Axle

The front axle uses to carry the weight of the front part of the vehicle as well as to facilitate steering and absorb shocks due to road surface variations. It is made of I-section in center position while the ends are made either circular or elliptical with the construction.

It takes bending loads and also torques due to braking of the wheel. To keep the low chassis heights, its center portion gives a down step sweep. Some times it also transmits torque from the differential to the drive wheels.

THE NECESSITY OF FRONT AXLE

Front axles are necessary to carry and to support a part of vehicle weight and facilitate steering and absorb road shocks as well as torque applied to due to braking of the vehicle. And some times it transmits torque from the differential to the drive wheels.

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CLASSIFICATION OF AXLE

1. Live Front Axle

The live axle receives power from the gearbox and transmits it to the road wheels. It is the axle containing the differential mechanism through which the engine power flows to the front of the wheels. For steering the front wheel, a constant velocity joint includes in the half shaft; these joints help in turning the stub axle around the kingpin.

2. Front Dead Axle

Is it just a dummy axle having no connection with the engine? These axles do not rotate with the driver when compared to live axles. The Dead front axle has sufficient rigidity and strength to transmit the weight of the vehicle form the springs to the front wheels.

The ends of the axle beam shape suitably to assemble the stub axle. To accommodate a swivel pin connecting the sub axle portion of the assembly, the terms of a part of the beams are usually shaped either as a yoke or unattractive surface with a drilled hole.

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WHAT IS STUB AXLE

WHAT IS STUB AXLE
What is Front Axle

A stub axle is a sub-assembly of a front axle beam upon which the road wheel mount. Stub axle is connected to the front axle using kingpin. These stub axles turn about the kingpin, which is light drive fit in the axle beam eye, located and locked by the taper cotter pin.

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TYPES OF STUB AXLE

1. Elliot Type Stub Axle

WHAT IS STUB AXLE
What is Front Axle

This type of stub axle is attached to the front axle by placing it in the yoke end with a kingpin and a cotter to join the two together. The swivel pin is usually fixed in the stub axle forging with its purposes turning in the forced closing of the axle beam. Axle beam forms as a yoke and receives stub axle. The thrust washer place at the top portion of the stub axle.

2. Reverse Elliot Type Stub Axle

WHAT IS STUB AXLE
What is Front Axle

The reverse Elliot type stub axle forms the fork end to receive the front axle beam. The front axle end forms eye, and the thrust washer place at the bottom of the front axle beam that is at the contact face with the stub axle.

The cotter pin in the joint that locks the movement of the kingpin in the front axle. The kingpin is free to move in the phosphor bronze bushes placed in the eye of the fork end. The thrust washer takes vertical load in the joint and its use to increase the life of both the stub axle and front axle. Stub axle forms as a yoke and receives the front axle. Thrust washer placed at the bottom.

3. Lamoine Type Stub Axle

WHAT IS STUB AXLE
What is Front Axle

The front axle beam end forms the eye to take support on the stub axle. The stub axle and kingpin integrates to create reverse. L shape assembly receives the front axle. The thrust washer place between the stub axle and front axle beam. Here the cotter pin in the joint is used to lock the front axle in position. The kingpin is free to move in the bushes placed in the eye of the front axle. The thrust washer takes the vertical load in the joint.

4. Reverse Lamoine Type Stub Axle

WHAT IS STUB AXLE
What is Front Axle

The front axle beam-ends forms eye to take support the stub axle. The stub axle and kingpin integrates to form an inverted L shape assembly to receive the front axle.

The thrust washer is placed at the bottom, as shown in the figure. The cotter pin in the joint use to lock the front axle in position. The kingpin is free to move in the bushes placed in the eye of the shaft. The thrust washer takes the vertical load, and it increases the life of both the stub axle and front axle.

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