Simple gear train
Let,
N1 = Speed of gear 1(or driver) in r.p.m.,
N2 = Speed of gear 2 (or driven or follower) in r.p.m.,
T1 = Number of teeth on gear 1, and
T2 = Number of teeth on gear 2.
Since the speed ratio (or velocity ratio) of gear train is the ratio of the speed of the driver to
the speed of the driven or follower and ratio of speeds of any pair of gears in mesh is the inverse of
Their number of teeth, therefore
Speed ratio :- N1/N2 = T2 / T1
2. Compound gear trains :-
When there are more than one gear on a shaft,. it is called a compound
train of gear.
इस प्रकार की गियर ट्रेन में एक ही सॉफ्ट पर दो या दो से अधिक गियर दृढ़ता पूर्वक लगे होते हैं इसलिए से कंपाउंड गियर ट्रेन कहते हैं|
In a compound train of gears, the gear 1 is the driving gear mounted on
Shaft A, gears 2 and 3 are compound gears which are mounted on shaft B. The gears 4 and 5 are also compound gears which are mounted on shaft C and the gear 6 is the driven gear mounted on shaft D.
Let
N1 = Speed of driving gear 1,
T1 = Number of teeth on driving gear 1,
N2 ,N3 ..., N6 = Speed of respective gears in r.p.m., and
T2 ,T3...., T6 = Number of teeth on respective gears.
Speed ratio :-
N1/N2 × NE/N4 ×N5/N6 = T2/T1 ×T4/T3× T6/T5
OR N1/N6 = T2/T1 ×T4/T3× T6/T5
3.Epicyclic gear trains:-
the axes of the shafts, over which
The gears are mounted, may move relative to a fixed axis. Are known as epicyclic gear train.
इस प्रकार इस प्रकार की गेर ट्रेन में गियर प्रकार लगे होते हैं कि वे एक दूसरे के सापेक्ष घूम सकें | इस प्रकार की गेर ट्रेन का use high velocity ratio के लिए किया जाता है
Here below the table of some conditions of motion of Epycyclic gear train.
4.Reverted gear train:-
When the axes of the first gear (i.e. first driver)
And the last gear (i.e. last driven or follower) are co-axial, then the gear train is known as reverted gear train.
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Thenks sir
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