Reverse Brake Band
Description
The reverse brake band is one of the components of an automatic transmission (AT) that is used to engage and disengage reverse gear. It is a flexible belt with a friction lining on the inner surface that interacts with the reverse gear drum.
Operating principle
When reverse gear is engaged, a hydraulic piston moves the brake band, pressing it against the reverse gear drum. The friction between the belt and the drum creates the torque needed to propel the vehicle in reverse. When reverse gear is disengaged, the piston releases the brake band, freeing the drum and allowing the vehicle to move forward.
Design
The reverse brake band is usually made of a durable fabric such as Kevlar or carbon fiber with a friction lining bonded to it. The reverse gear drum has an appropriate friction surface, which ensures maximum grip on the belt.
Damage and malfunctions
The most common problems associated with reverse brake bands are:
*Friction lining wear: Long-term use can cause the lining to wear, reducing friction and the belt’s ability to engage reverse gear.
* Contamination: Contamination with oil or dirt can reduce the friction between the belt and the drum.
* Belt slippage: This may be caused by worn friction lining, contamination or a faulty hydraulic piston.
Consequences of malfunctions
A faulty reverse brake band can cause the following problems:
* Difficulty engaging reverse gear
* Reverse gear slipping while driving
*Damage to reverse drum
* Damage to other automatic transmission components
Maintenance and repair
Regular maintenance and timely repair of the reverse brake band are crucial to ensure proper operation of the automatic transmission. Common maintenance procedures include:
* Checking the condition of the friction lining
* Cleaning the belt and drum from dirt
*Replacement of worn or damaged tape
In case of serious malfunctions, it may be necessary to repair or replace the hydraulic piston or other automatic transmission components.