Spur Gear Drives

Parallel axis

A ________ gear drive is one in which the driver and driven shafts lie side by side and point in the same direction

Lubricant

A certain amount of backlash is necessary to enable the gears to mesh smoothly and to allow ________ to get to each tooth

Closed

A gear drive that has a housing that contains the gears and lubricant is called a _______ unit gear drive

Idler gear

A gear that transfers speed and torque from a driver gear to a driven gear is called an ________

Moving axis

A rack and pinion gear drive is an example of a ________ gear drive system

Non-intersecting axis

A work gear drive is an example of a ________ gear drive

Dial indicator

Backlash can be measured by using a ________

Change

Idler gears ________ the direction of rotation it transfer power to a location that is farther from the driven shaft

Length

In one method of measuring backlash, a bar is attached to the driven shaft and a dial indicator measures its movement. This method must be adjusted to account for the ________ of the bar

Lubricated

Metal gears must be ________ which is accomplished with gear oil

Adjustable

Some types of gear drives are designed so that the backlash is ________

Gear

The _______ ratio is determined by dividing the pitch diameter of the driven gear by that of the driver gear

Dedendum

The ________ is the distance from the pitch circle to the bottom land and coincides with the tooth flank

Module

The ________ is the length of a pitch diameter per tooth and represents the size of the gear tooth

Line of action

The ________ is the path made by the point where the 2 gears make contact

Direct

The ________ method of measuring backlash is most often used for large gears

Indirect

The ________ method of measuring backlash is used when the gears are not easy to access or the gear teeth are very small

Alignment

The ________ of a gear drive is accomplished through the use of a straight edge or a length of string

Tooth profile

The characteristic shape made by the edge of a tooth is known as the ________

Pitch circle

The circle along which speed and torque are directly transferred is called the ________

Inversely

The speed ratio of a gear drive is ________ proportional to the gear ratio

Directly

The torque ratio of a gear drive is ________ proportional to the gear ratio

Rotated

When measuring backlash, one gear must be held in a fixed position while the other is ________ back and forth

Pinion

When the gears of a gear drive are of differing sizes, the smaller gear is known as the ________

Backlash

________ is defined as the clearance between the back of the engaged tooth of the driver gear and the front of the engaged tooth of the driven gear

Backlash

________ is the difference between the thickness of a tooth and the width of the tooth space

Tooth space

________ is the volume of space between 2 teeth of a gear