Gearbox what is

The dog clutches D and D2 are mounted on the main shaft. One D2 is connected between clutch gear and reverse gear whereas the other D is placed between low speed gear and reverse gear. The splines are provided on the main shaft for the linear movement of dogs.

Dog clutch can slide on the shaft and rotate along with it. All gears are rigidly fixed on the counter shaft. All main shaft and layshaft gears, and idler gears are engaged by dog clutch to obtain opposite and slow speed. Only reverse gears are spur gear type and all others are helical gears. As compared with the sliding mesh type, the constant mesh type gearbox meshes more readily with the gears having less danger of damaging during meshing because the gear diameters are smaller with few numbers of teeth.

So, this type has more defects when compared to a synchromesh type. The necessity of double clutching is needed so that it is not used to any large extent. Synchromesh gearbox uses synchronizer instead of sliding dog clutches to affect the ratio change.

The synchromesh gearbox is similar to the constant-mesh gearbox, but the synchromesh gearbox is provided with a synchronizer, the device by which two gears to be engaged are first brought into frictional contact which equalizes their speed, afterward they are engaged smoothly. To engage, when the gear lever is moved the synchronizer cone meets with a similar cone on the pinion. Due to friction, the rotating pinion is made to rotate at the same speed as the synchromesh unit.

To give a positive drive further, movement of the gear lever enables the coupling to override several spring load balls and the coupling engages with the dogs on the side of the pinion. Since both pinions and synchromesh units are moving at the same speed, this engagement is done without noise or damage to the dogs.

A slight delay is necessary before engaging the dog teeth so that the cones have a chance to bring the synchronizer and pinion to the same speed.

An epicyclic gear train also known as planetary gear consists of two gears so that the center of one gear rotates around the center of the other. A carrier connects the centers of two gears and rotates to carry one gear, called planet gear or planet pinion, around the other, called sun gear or sun wheel. The rays of the planet and the sun form traps so that their pitch circles are rolled without slip. A point on the pitch circle of the planetary gear traces an epicyclic curve.

In this simplified case, the sun gear is fixed and there is planetary gear rolled around the sun gear. An epicyclic gear train can be assembled so the planetary gear is rolled onto a fixed, external gear ring or inside the pitch circle of the ring gear, sometimes called the annular gear. In this case, the curve detected by a point on the planet pitch circle is a hypocycloid.

The combination of epicyclic gear trains with a planet engaging both a sun gear and a ring gear is called planetary gear train. In this case, the ring gear is usually fixed and the sun gear is operated.

Various speeds are obtained automatically in gearboxes known as automatic gearboxes. Generally, the driver selects the car condition such as neutral, forward or reverse.

The gear selection, timing, and engagement of gear for the required gear speed select automatically when the accelerator press or depress.. The gears are mounted on shafts, which are supported by and rotate via rolling element bearings. The gearbox is a mechanical method of transferring energy from one device to another and is used to increase torque while reducing speed.

Gearboxes are used in many applications including machine tools, industrial equipment, conveyors, and really any rotary motion power transmission application that requires changes to torque and speed requirements. What are Power-Transmission Gears? Dear sir. Words related to gearbox broadcast , communication , delivery , conductance , conduction , dispatch , message , sending.

How to use gearbox in a sentence Its power output increased significantly, the styling is sleeker, and a row-your-own gearbox still remains available to buyers who really want an engaged driving experience.

Nissan finally updated the Z sports car. Each time you pass power from one gear wheel to another, you can do one of two things: Bicycle gears Increase speed : If you connect two gears together and the first one has more teeth than the second one, the second one has to turn round much faster to keep up.

So this arrangement means the second wheel turns faster than the first one but with less force. Change direction : When two gears mesh together, the second one always turns in the opposite direction. So if the first one turns clockwise, the second one must turn counterclockwise. You can also use specially shaped gears to make the power of a machine turn through an angle. In a car, for example, the differential a gearbox in the middle of the rear axle of a rear-wheel drive car uses a cone-shaped bevel gear to turn the drive shaft's power through 90 degrees and turn the back wheels.

It consists of two or more gears with one of the gears driven by the motor. The output speed of the gear box will be inversely proportional to gear ratio.