Table of Contents
Construction of Bendix drive
The figure shows the Bendix drive to start the motor. It is attached to the starter motor armature shaft. The drive head is fitted to the end of the armature shaft. The pinion gear, which has internal threads, is mounted in a threaded sleeve, just like a bolt nut.
The sleeve is not directly connected to the starter motor shaft but uses it only as a bearing. A spring is attached to the drive head and also to the sleeve.
Operation of Bendix drive
When the starter is at rest, the pinion gear is not engaged with the flywheel. When the starter is started, the armature starts to rotate. This causes the threaded sleeve to rotate as well because the sleeve is secured to the armature shaft by a spring.
The pinion, due to its inertia at rest and its unbalanced weight, rotates very little but advances in the rotating volt until it engages with the teeth of the steering wheel. The slight rotation of the pinion gear helps to properly engage the flywheel.
When the pinion gear hits the collar, it starts to rotate with the sleeve, causing the flywheel to work with it. When the flywheel turns, the crankshaft also turns and the engine starts. The spring between the armature shaft and the threaded sleeve takes the shock from the start.
Over running clutch
Overrunning clutches, sometimes called freewheel clutches, are used to freewheel in one direction while driving in the other direction of rotation. When the drive shaft rotates faster than the drive shaft, the clutch mechanically disconnects the driveshaft from the drive shaft.
They are used in heavy-duty applications, such as agriculture, mining, aerospace, industrial metal processing, indexing, and more. They are often used when backstops, multi-speed, dual- and one-way drives are required.
The four types of Overrunning clutches include spray, roller ramp, wrap spring and wedge styles. One of the longest-running designs is the roller ramp clutch, which has cylindrical rollers mounted on a wedge-shaped area made up of an outer cylindrical surface and an inner flat surface.
When friction occurs between the rollers and these surfaces, the rollers spread strongly as the flat interior rotates in the driving direction. It attaches to the clutch
