The basic mechanical operation of a gearbox is explained on a drivetrain demonstrating the advantages of gearing, axles, clutch shifting, and the application.
- The purpose of the gearbox is to increase torque whilst reducing speed. You will find a gearbox in both a manual and an automatic car, but while the manual gearbox requires the driver to physically move a gear stick to select the gears, the automatic gearbox engages the gear itself when the engine speed changes.
- Jack up the end of the car where the gearbox is fitted, and support it on axle stands. Chock the wheels remaining on the ground. Apply the handbrake if you jack the front end. Road dirt may hide a leak, so that the first sign you notice is a low gearbox level during a routine check.
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Thank you for visiting SCS Gearbox, your number one source for quality manufactured quick change gears, 4×4 transfer cases, custom machining, high performance transmissions and so much more. For answers to questions about ordering, give us a call at 419-483-7278 or by emailing us at sales@scsgearbox.com. In the meantime, browse through the rest of our website to learn more about our products.
SCS Gearbox Inc, manufactures specialized gearing for high performance racing applications in tractors, trucks, and much more. When you take the time to see all that we have to offer, you will find a company with a track record of exceptional products with outstanding customer service. SCS Gearbox Inc. is a company that never settles for being less than the best it can be. Here is a sample of what we have to offer. You will find that we have just what you’re looking for.
We are a company that grows with its clientele. We have expanded to provide the wide range of items that we sell today and we will continue to grow with our clientele into the future. If you need Quick Change Gears and Custom Machining or a 4×4 Transfer Case, Transmissions, and Truck Gears. We will do our very best to give you what you need.
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The Video Course teaches you everything about modern cars.
The first stage in the transmission of a car with a manual gearbox is the clutch.
It transmits engine power to the gearbox, and allows transmission to be interrupted while a gear is selected to move off from a stationary position, or when gears are changed while the car is moving.
Most cars use a friction clutch operated either by fluid (hydraulic) or, more commonly, by a cable.
When a car is moving under power, the clutch is engaged. A pressure plate bolted to the flywheel exerts constant force, by means of a diaphragm spring, on the driven plate.
Earlier cars have a series of coil springs at the back of the pressure plate, instead of a diaphragm spring.
The driven (or friction) plate runs on a splined input shaft, through which the power is transmitted to the gearbox. The plate has friction linings, similar to brake linings, on both its faces. This allows the drive to be taken up smoothly when the clutch is engaged.
When the clutch is disengaged (pedal depressed), an arm pushes a release bearing against the centre of the diaphragm spring which releases the clamping pressure.
The outer part of the pressure plate, which has a large friction surface, then no longer clamps the driven plate to the flywheel, so the transmission of power is interrupted and gears can be changed.
When the clutch pedal is released, the thrust bearing is withdrawn and the diaphragm-spring load once again clamps the driven plate to the flywheel to resume the transmission of power.
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Some cars have a hydraulically operated clutch. Pressure on the clutch pedal inside the car activates a piston in a master cylinder, which transmits the pressure through a fluid-filled pipe to a slave cylinder mounted on the clutch housing.
The slave-cylinder piston is connected to the clutch release arm.
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The modern clutch has four main components: the cover plate (which incorporates a diaphragm spring), the pressure plate, the driven plate, and the release bearing.
The cover plate is bolted to the flywheel, and the pressure plate exerts pressure on the driven plate through the diaphragm spring or through coil springs on earlier cars.
The driven plate runs on a splined shaft between the pressure plate and flywheel.
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It is faced on each side with a friction material which grips the pressure plate and flywheel when fully engaged, and can slip by a controlled amount when the clutch pedal is partially depressed, allowing the drive to be taken up smoothly.