Podcast
Questions and Answers
What is the purpose of the pinion in a gear assembly?
What is the purpose of the pinion in a gear assembly?
- To provide direct power to the engine
- To facilitate high-speed reduction
- To connect the input shaft with the propeller shaft (correct)
- To adjust the speed ratio
In a double reduction gear assembly, what is the role of the intermediate gear?
In a double reduction gear assembly, what is the role of the intermediate gear?
- To act as the first reduction gear (correct)
- To directly drive the propeller shaft
- To connect the input shaft with the pinion
- To adjust the gear diameter
What component is responsible for connecting the pinion to the input shaft in a double reduction gear arrangement?
What component is responsible for connecting the pinion to the input shaft in a double reduction gear arrangement?
- Second reduction gear
- Large gear
- Intermediate gear
- Flexible coupling (correct)
What is the primary function of the second reduction gear mounted on the propeller shaft?
What is the primary function of the second reduction gear mounted on the propeller shaft?
How does a double reduction gear assembly differ from a single gear assembly?
How does a double reduction gear assembly differ from a single gear assembly?
What advantage does a double reduction gear assembly have over a single gear assembly?
What advantage does a double reduction gear assembly have over a single gear assembly?
What ensures the connection between the armature and rotor in an electromagnetic coupling?
What ensures the connection between the armature and rotor in an electromagnetic coupling?
What happens when the voltage disappears in an electromagnetic coupling?
What happens when the voltage disappears in an electromagnetic coupling?
Which system does NOT utilize electromagnetic couplings according to the text?
Which system does NOT utilize electromagnetic couplings according to the text?
What is the main function of reduction drives in engines?
What is the main function of reduction drives in engines?
Which type of reduction gear consists of only one pair of gears?
Which type of reduction gear consists of only one pair of gears?
In a reduction gear box assembly, what enters through the ports mentioned in the text?
In a reduction gear box assembly, what enters through the ports mentioned in the text?
Study Notes
Reduction Gears
- A small gear called a pinion is driven by the incoming engine shaft, directly driving a large gear mounted on the propeller shaft.
- The speed is adjusted by making the ratio of the speed reduction to the diameter of pinion and gear proportional.
Single Reduction Gear
- A single gear assembly has a gear double the size of a pinion.
- The arrangement consists of only one pair of gears.
- The reduction gear box consists of ports through which the propeller shaft and engine shaft enter the assembly.
Double Reduction Gear
- Double reduction gears are used in applications involving very high speeds.
- The pinion is connected to the input shaft using a flexible coupling.
- The pinion is connected to an intermediate gear (first reduction gear) which is then connected to a low-speed pinion with the help of one more shaft.
- This pinion is connected to the second reduction gear mounted directly on the propeller shaft.
- Such an arrangement facilitates the reduction of speed to a ratio as high as 20:1.
Electromagnetic Couplings
- An electrically generated magnetic force ensures connection between the armature and rotor in an electromagnetic coupling.
- If the voltage disappears, the magnetic field is removed, and the pre-stressed spring will separate again the armature and rotor.
- Electromagnetic couplings are used in systems such as electromagnetic brakes, electromagnetic pull/push, electromagnetic clutches, electromagnetic vibrators, and reduction gear drives.
Reduction Drives
- Reduction drives are used in engines of all kinds to increase the amount of torque per revolution of a shaft.
- Examples of reduction drives include the gearbox, differential, and steering boxes of any car.
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Description
Test your knowledge on electromagnetic couplings and brakes used in mechanical systems. This quiz covers topics such as the function, components, and applications of electromagnetic couplings.
