Starter for Forklift - Today's starter motor is usually a permanent-magnet composition or a series-parallel wound direct current electrical motor with a starter solenoid installed on it. As soon as current from the starting battery is applied to the solenoid, mainly through a key-operated switch, the solenoid engages a lever which pushes out the drive pinion which is positioned on the driveshaft and meshes the pinion utilizing the starter ring gear that is found on the flywheel of the engine.
Once the starter motor starts to turn, the solenoid closes the high-current contacts. When the engine has started, the solenoid consists of a key operated switch which opens the spring assembly to be able to pull the pinion gear away from the ring gear. This action causes the starter motor to stop. The starter's pinion is clutched to its driveshaft by an overrunning clutch. This allows the pinion to transmit drive in only a single direction. Drive is transmitted in this method via the pinion to the flywheel ring gear. The pinion continuous to be engaged, like for instance since the driver fails to release the key when the engine starts or if the solenoid remains engaged as there is a short. This causes the pinion to spin independently of its driveshaft.
This aforesaid action stops the engine from driving the starter. This is an essential step in view of the fact that this kind of back drive will enable the starter to spin really fast that it can fly apart. Unless modifications were made, the sprag clutch arrangement would stop using the starter as a generator if it was used in the hybrid scheme mentioned prior. Normally a standard starter motor is meant for intermittent use that will prevent it being utilized as a generator.
The electrical components are made so as to operate for around 30 seconds to be able to avoid overheating. Overheating is caused by a slow dissipation of heat is because of ohmic losses. The electrical parts are meant to save weight and cost. This is the reason the majority of owner's handbooks for vehicles suggest the operator to pause for at least ten seconds right after each ten or fifteen seconds of cranking the engine, when trying to start an engine that does not turn over right away.
During the early 1960s, this overrunning-clutch pinion arrangement was phased onto the market. Previous to that time, a Bendix drive was utilized. The Bendix system works by placing the starter drive pinion on a helically cut driveshaft. When the starter motor starts spinning, the inertia of the drive pinion assembly allows it to ride forward on the helix, hence engaging with the ring gear. As soon as the engine starts, the backdrive caused from the ring gear allows the pinion to exceed the rotating speed of the starter. At this instant, the drive pinion is forced back down the helical shaft and hence out of mesh with the ring gear.
In the 1930s, an intermediate development between the Bendix drive was developed. The overrunning-clutch design that was made and launched in the 1960s was the Bendix Folo-Thru drive. The Folo-Thru drive has a latching mechanism along with a set of flyweights in the body of the drive unit. This was better in view of the fact that the standard Bendix drive used to be able to disengage from the ring when the engine fired, even though it did not stay running.
When the starter motor is engaged and begins turning, the drive unit is forced forward on the helical shaft by inertia. It then becomes latched into the engaged position. When the drive unit is spun at a speed higher than what is attained by the starter motor itself, like for instance it is backdriven by the running engine, and then the flyweights pull outward in a radial manner. This releases the latch and enables the overdriven drive unit to become spun out of engagement, therefore unwanted starter disengagement can be prevented before a successful engine start.
Click to Download the pdf