Automotive Technology
7th Edition
ISBN: 9781337794213
Author: ERJAVEC, Jack.
Publisher: Cengage,
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Textbook Question
Chapter 39, Problem 2ASRQ
A noise occurs in forward and reverse gears but not in neutral: Technician A says that the input shaft bearing may be bad. Technician B says that the mainshaft bearing may be bad. Who is correct?
a. Technician A only
b. Technician B only
c. Both Aand B
d. Neither A nor B
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Tech A says that if a noise is caused by a set of worn gears, it will normally be loudest in that gear while driving under a load. Tech B says that if the bearings on the input shaft, countershaft, or main shaft are worn, either front or rear, a growling noise will result when stopped in gear. Who is correct?
Two mating 20°, 8-pitch, spur gears have 14 and 42 teeth. Will they interfere?
State an equation tha relate the number of teeth of gear D, B and C.
Chapter 39 Solutions
Automotive Technology
Ch. 39 - After draining gear oil from a transaxie, the...Ch. 39 - Prob. 2SACh. 39 - Prob. 3SACh. 39 - What tool is often required to remove gears and...Ch. 39 - When removing or installing bearings, where should...Ch. 39 - List five common sources for transmission fluid...Ch. 39 - What should you do to properly identify the type...Ch. 39 - List at least five items that are typically...Ch. 39 - Prob. 1TFCh. 39 - True or False? Bearing noise increases under load...
Ch. 39 - A rough, growling noise that is heard from a...Ch. 39 - A clicking noise during transrnission/transaxle...Ch. 39 - Worn teeth on a speed gear can cause_______. a....Ch. 39 - Using a lubricant that is thicker than the...Ch. 39 - A poorly adjusted shift linkage can cause which of...Ch. 39 - Technician A says that the transmission rear seal...Ch. 39 - A noise occurs in forward and reverse gears but...Ch. 39 - A rough, growling noise occurs when a vehicle with...Ch. 39 - A car jumps out of gear into neutral, particularly...Ch. 39 - While diagnosing a noise from a transmission:...Ch. 39 - Technician A says that broken or worn engine and...Ch. 39 - Technician A says that shims may be used to adjust...Ch. 39 - During a test drive, a noise that appears to be...Ch. 39 - While inspecting the synchronizers of a transaxle:...Ch. 39 - Technician A says that the proper fluid level for...
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- Two mating external 8-pitch, 20o , spur gears have 24 and 64 teeth. Determine the contact ratio.arrow_forwardWhat is ''Dynamic load analysis of spur gears"arrow_forwardTechnician A says that a hunting gearset is one in which one drive pinion gear tooth contacts only certain ring gear teeth, Technician B says that a partial nonhunting gearset is one in which one pinion tooth contacts only six ring gear teeth. Who is correct?arrow_forward
- An epicyclic gear train has 3 shafts A,B and CA is an input shaft running at 100 rpm clockwise. B is an output shaft running at 250 rpm clockwise. Torque on A is 50 kNm (clockwise). C is a fixed shaft. The torque to fix Carrow_forwardTechnician A says that side-bearing preload limits the amount the differential case is able to move laterally in the axle housing. Technician B says that adjusting backlash sets the depths of the mesh between the ring and pinion gears’ teeth. Who is correct?arrow_forwardEvaluate the number of teeth of gear D.arrow_forward
- Analyse the holding torque and power transmitted through epicyclic gear trainsarrow_forwardTwo meshing spur gears with 20 pressure angle have a module of 4 mm. The centre distance is 220 mm and the number of teeth on the pinion is 40. What should be the new centre distance so that pressure angle is increased to 22°? (Ans. 221.9 mm).arrow_forwardFor full depth of involute spur gears. minimum number of teeth of pinion to avoid interference depends upon (a) pressure angle B)speed ratio C)circular pitch D)pitch diameterarrow_forward
- Compare the differences between different gear profilesarrow_forward2-) Answer the following questionsa-) The number of teeth that the gear wheels will have at least in order not to be cut from under the profile is called the limit tooth number. Calculate the theoretical minimum number of teeth the pinion gear can have by considering the reference profile without profile slip in evolvent gears, taking the clutch angle of 250.b-) If a gear system is dimensioned according to surface pressure calculations and controlled according to strength, how can a comment be made about the hardness of the gear wheel. Give examples of what the material of this gear wheel could be (3 pieces).arrow_forwardA 78-tooth spur gear is in mesh with a 27-tooth pinion. The pd = 6 and ϕ = 20°. Find the contact ratio.arrow_forward
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