What does positive drive mean?

Positive drive means the drive without slip during transmission.for example gears.You cannot find a slip in gear unless and until in rare case if there is a breakage of gear teeth,and chain drive also have only some negligible slip. But whereas in negative drive there will be slip in transmission.

Are called positive drives?

However, the pitch line velocity of gears in contact is constant throughout the power transmission process. Or there is no slipping at the pitch point. Due to this reason we call them positive drives.

Which drives are positive drives?

Explanation: Positive drive: A drive-in which slip does not occur is known as a positive drive. In any Flat, Round, or Crossed belt drive, the belt can slip on the surface of the pulley, since there is no projection or tooth-like structure to lock it in place.

Why chain drive is called positive drive?

Because of slip, velocity ratio does not remain constant in belt drive. Thus it is not a positive drive. Here velocity ratio remains fixed. So chain drive is one positive drive.

Is V belt drive a positive drive?

V-belt drive can transmit comparatively higher power because of the increased friction force due to wedge action. Thus is not a positive drive. Due to higher friction force for wedge action, slip does not occur at low speed in V-belt drive. However, if load exceeds the rated capacity, then slip may occur.

What is another name for a positive drive belt?

Synchronous belts (also called cogged, timing, positive-drive, or high-torque drive belts) are toothed and require the installation of mating grooved sprockets. These belts operate with a consistent efficiency of 98\% and maintain their efficiency over a wide load range.

Is rope drive is a positive drive?

A Yorkshire mill converted to use a 1,000 hp Allen diesel engine in 1938, and retained the rope drives. Shaft drives had often used gearing from the engines to increase their speed, and thus their power transmission.

Why are V belts better than flat belts?

The V-shape makes it easier to keep fast-moving belts in sheave grooves than it is to keep a flat belt on a pulley. The biggest operational advantage of a V-belt is the wedging action into the sheave groove. This geometry multiplies the low tensioning force to increase friction force on the pulley sidewalls (Fig. 3).

Is V-belt drive a positive drive?

Which belt should be used for a positive drive application?

Super Drive ensures positive tracking without side-to-side movement. The homogeneous structure of the belt makes it an excellent choice for applications where sanitation and hygiene are essential to production uptime. Modular belts are another positive drive solution.

Is V-belt a positive drive?

The V-belt drive gives compactness due to the small distance between the centres of pulleys. 2. The drive is positive, because the slip between the belt and the pulley groove is negligible. Since the V-belts are made endless and there is no joint trouble, therefore the drive is smooth.

Why do V belts fail?

Missing cogs can cause belts to slip and fail, when it is discovered there are teeth missing, the belt should be changed immediately. The most common reasons your belt could be missing a cog are excessive heat, the pulleys are too small or misaligned. It can also be caused by improper or prolonged storage of belts.

What is an example of a positive drive?

Gear drives, chain drives are examples of positive drives. It provides a constant velocity ratio. Positive drives are costlier than belt drives (allow slippage). 8 clever moves when you have $1,000 in the bank.

What is the meaning of positivity?

pos·i·tive. (pŏz′ĭ-tĭv) adj. 1. Characterized by or displaying certainty, acceptance, or affirmation: a positive answer; positive criticism. 2. Measured or moving forward or in a direction of increase or progress: positive steps. 3. a.

What is a negnegative drive?

Negative drive, is an unusual term, allows slippage as with belt drive. Gears are said to be ‘POSITIVE DRIVE” because there is no slippage between the input and output. The other possibility is a friction drive.

What is the definition of positive for kids?

Kids Definition of positive. 6 : being greater than zero and often shown by a plus sign 2 or +2 is a positive number. 7 : being or relating to electricity of a kind that is produced in a glass rod rubbed with silk a positive charge.