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Among the following types of gears, which gears offer a refinement over spur gears?

Among the following types of gears, which gears offer a refinement over spur gears? Correct Answer Helical Gears

Spur Gears: Spur gears have teeth parallel to the axis of the shaft and are used to connect two shafts when they are parallel. At the time of engagement of the two gears the contact extends the entire width on a line parallel to the axes of the rotation. This results in the sudden application of the load, high impact stresses and excessive noise at high speeds.

Helical Gears: Helical gears have curved teeth, it is also used to connect the two shafts which are parallel to each other. At the beginning of the engagement, contact occurs only at the point of leading edge of the curved teeth. As the gears rotate the contact extend along a diagonal line across the teeth. Thus, the load application is gradual which results in low impact stresses and reduction in noise.

Therefore by using the helical teeth gear the impact stresses are reduced by converting the instantaneous engagement by converting into gradual engagement.

Related Questions

Consider the following statements: 1. In spur gears, the contact occurs abruptly on a line parallel to the axis, and the disengagement too is abrupt. 2. In helical gears, both loading and unloading are gradual, and therefore, these happen more smoothly and less noisily 3. When two gears mesh, any arbitrary shape of the tooth can be chosen for the profile of the teeth of any one of the two gears, and the profile for the other shall be obtained by applying the law of gearing. Which of the above statements are correct?
Simplify : $${{{5 \over 3} \times {7 \over {51}}{\text{ of }}{{17} \over 5} - {1 \over 3}} \over {{2 \over 9} \times {5 \over 7}{\text{ of }}{{28} \over 5} - {2 \over 3}}}$$
Arrange the following concepts in sequence in which they occur, using the given below:
(1) Offer is communicated
(2) Counter-offer is made
(3) Offer is rejected
(4) Counter-offer is accepted
Which of the following statements is/are correct?
1. Counter offer puts an end to the original offer.
2. In counter offer, the previous offer can be revived.
3. Acceptance must be absolute and unqualified.
4. Acceptance with new terms is valid.
Select the correct answer using the given below:
According to a survey of business firms in a certain city, 750 firms offer their employees health insurance , 640 offer dental insurance and 280 offer health insurance and dental insurance. How many firms offer their employees health insurance or dental
Assertion 'a': During casting of aluminium, grain refinement can be achieved by addition of certain alloying elements.
Reason 'r': The addition of the alloying elements may result in the formation of deoxidation products or intermetallic compounds which may act as nucleation sites for grain refinement.
Why are the helical gears used commonly in transmission over spur gears?
A passage is given with five questions following it. Read the passage carefully and select the best answer to each question out of the given fouralternatives. He wasn't the first, nor would he be the last, but the wiry, bespectacled man from Gujarat is certainly the most famous of the world's peaceful political dissidents.Mohandas Gandhi – also affectionately known as Mahatma – led India's independence movement in the 1930s and 40s by speaking softly without carrying much ofa big stick, facing down the British colonialists with stirring speeches and non-violent protest. More than anything else, historians say, Gandhi proved that one manhas the power to take on an empire, using both ethics and intelligence. Urges Britain to quit India It is hard to imagine the thin, robed Gandhi working in the rough and tumble world of law, but Gandhi did get his start in politics as a lawyer in South Africa, where he supported the local Indian community's struggle for civil rights. Returning to India in 1915, he carried over his desire to improve the situation of the lower classes. Gandhi quickly became a leader within the Indian National Congress, a growing political party supporting independence, and traveled widely with the party to learnabout the local struggles of various Indian communities. It was during those travels that his legend grew among the Indian people, historians say. Gandhi was known as much for his wit and intelligence as for his piety. When he was arrested several more times over the years for his actions during the movement,Gandhi calmly fasted in prison, believing that his death would embarrass the British enough to spur independence, which had become the focus of his politics by1920. Gandhi's non-cooperation movement, kicked off in the early 1920s, called for Indians to boycott British goods and traditions and become self-reliant. His mostfamous protest came in 1930, when Gandhi led thousands of Indians on a 250-mile march to a coastal town to produce salt, on which the British had a monopoly. What led to the growth of legend of Mahatma Gandhi among the Indians?
Two advantages of using helical gears rather than spur gears in a transmission system are
Gears having teeth cut on the rotating face plane of the gear and mate with standard involute spur gears are known as