How does overspeed governor work?
The overspeed governor is a safety device that comes into operation when the lift car exceeds its permitted speed. If the lift car exceeds its rated speed upon descent, the overspeed governor trips when its tripping speed is reached and triggers the safety gear on the lift car via the governor rope.
What is speed governor system?
A SPEED LIMIT DEVICE (SLD) OR SPEED GOVERNOR means a device whose primary function is to control the speed of the engine in order to limit the vehicle speed to the pre-specified value. …
What is the importance of speed governor?
Speed governor has another important function, it reduces the strain on the engines. Hence, it improves the fuel consumption and increases the life of engines. It also reduces the maintenance cost for the owners of those heavy vehicles because it has improved fuel consumption and efficiency already.
How do you check a speed governor?
Simply chuck the wheel shaft in a drill and spin the governor wheel until it trips. RPM can be measured with a techometer such as Wurtec part numbers 12-240-B, DT-107A, DT-105A, 12-256, or 12-260.
What does the governor do in an elevator?
An overspeed governor is an elevator device which acts as a stopping mechanism in case the elevator runs beyond its rated speed. This device must be installed in traction elevators and roped hydraulic elevators.
What causes engine overspeed?
Overspeed is any speed beyond the operating range specified by the engine manufacturer. Very often overspeed leads to serious damage, not only to the engine itself, but also to generators and gears. There are several reasons for overspeed, but the most common is malfunction of the governor or fuel oil pumps.
What is a traction elevator?
Traction elevators are lifted by ropes, which pass over a wheel attached to an electric motor above the elevator shaft. They are used for mid and high-rise applications and have much higher travel speeds than hydraulic elevators.
What is sheave in elevator?
A sheave is just a pulley with a grooves around the circumference. The sheave grips the hoist ropes, so when you rotate the sheave, the ropes move too. The ropes that lift the car are also connected to a counterweight (4), which hangs on the other side of the sheave.
Who is the inventor of the overspeed governor?
This device was first patented by Warner Elevator Mfg Company (Patent no.: US1549736) and then Otis (Patent no.: US3327811 ). Conventional elevator safety equipment includes an overspeed governor for restricting elevator car movement when a predetermined speed is exceeded.
How is a governor responsive to elevator car speed?
The system includes a governor that is responsive to elevator car speed through conventional coupling means such as a governor sheave coupled to a rope that is attached to an elevator car, whereby the rope transmits elevator car speed to the governor.
What happens when you hit the overspeed switch?
Radial extension of the flyballs or flyweights causes them to contact an overspeed switch. When the overspeed switch is actuated, the power to the motor and motor brake is cut, thereby causing the motor brake to apply a braking force on the motor shaft.
Why is speed governor important for road safety?
This makes speed management a very important tool for improving road safety. Speed Governor is a device which can limit the vehicle speed to a preset limit, thus improving vehicle efficiency and road safety. Autograde’s tamper-proof speed governors are certified by ARAI, and are made to government regulations.
This device was first patented by Warner Elevator Mfg Company (Patent no.: US1549736) and then Otis (Patent no.: US3327811 ). Conventional elevator safety equipment includes an overspeed governor for restricting elevator car movement when a predetermined speed is exceeded.
Why is speed a risk factor in road safety?
Speed is a significant risk factor in road safety. Several recent reports from the National Transportation Safety Board (NTSB) and the Governors Highway Safety Administration (GHSA) highlight the need for a greater focus on speed management at the national, state and local level.
Is the Autograde speed governor good for fleets?
This smooth operating device increases engine life, fuel efficiency, and reduce maintenance cost of your vehicles. The product is ideal for Fleets, where the cost of device could be recovered within a month. Autograde DASS-86 Speed Governor is being used in over 25 countries.