Lab_23__Transmissions_

Lab_23__Transmissions_ - BSE 2484 Lab 23(Transmissions...

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BSE 2484 Lab 23 (Transmissions) STATION # 1 (Small Transmission) The purpose of a transmission is to: Select speed ratios for various travel speeds Reverse the travel of the machine Sometimes to provide power to special drives such as a PTO This transmission at this station is from a small riding mower, the input from the engine is from a V belt, the power is then transmitted to the wheels by a chain. How many speeds does this transmission have? Blank # 1 Does this transmission have a reverse gear? Blank # 2
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BSE 2484 Lab 23 (Transmissions) STATION # 2 (Gear Box) Types of gear sets: Spur Gears – Mesh along the perimeter of the gears Straight spur – straight cut teeth - Helical spur – teeth cat at an angle Bevel Gears – Mesh along the face of the gears and transmit power at right angles Plain bevel – straight cut teeth Spiral bevel – teeth cat at an angle Hypoid – teeth cut at an even greater angle Planetary – teeth cut on the outside and inside of gears (sun, planet/planet carrier and ring gear) compound gear reduction Worm Gears – actually a screw and a gear works at right angles Rack & Pinion – converts straight line to rotary motion What type of gear set does this gear box have? Blank # 3
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BSE 2484 Lab 23 (Transmissions) STATION # 3 (Transmission Cutaway) Types of mechanical transmissions: Sliding Gear Has two or more shafts with sliding spur gears The spur gears are arranged to slide into mesh to change speed and direction Collar shift Has parallel shafts with helical gears in constant mesh Shifting locks one set of free running gears to the shaft with a sliding collar Synchromesh Has parallel shafts with helical gears in constant mesh However the gears can be shifted without clashing by synchronizing the speeds of the mating parts before engaging Observe the transmission at this station! What type of transmission is this?
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This note was uploaded on 03/31/2008 for the course BSE 2484 taught by Professor Dhvaughan during the Spring '08 term at Virginia Tech.

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Lab_23__Transmissions_ - BSE 2484 Lab 23(Transmissions...

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