In short
A crown wheel and pinion turns the drive by ninety degrees and cuts the speed to boost torque. When it whines or the drive feels loose, the mesh is worn.
Purana set ghis gaya hai? Bhejiye sample, hum waisa hi bana denge.
What a crown wheel and pinion does
It is the final gear pair in a tractor or truck axle. The engine drives a shaft along the machine. The wheels turn across it. Something must bend that drive by ninety degrees. That is this pair.
The small gear is the pinion. The big dished gear is the crown wheel. The pinion drives the crown wheel, the drive turns the corner, and the speed drops while the pull goes up.
How the ratio works
Count the teeth. Divide the crown wheel teeth by the pinion teeth. That is the ratio.
Say the crown wheel has 37 teeth and the pinion has 9. The ratio is close to 4 to 1. The wheels turn once for every four turns of the pinion. Speed falls by four. Torque climbs by about the same.
A higher ratio gives more pull and less speed. A lower ratio does the reverse. Pick the ratio for the job the machine does, not by guess.
Why it carries such a hard life
This pair takes the full load of the machine. Every start, every heavy pull, every shock from the field runs through it.
The teeth do not mesh flat like spur gears. They slide and roll at an angle. So they need the right curve, the right contact spot and the right backlash. Get those wrong and the set is loud from day one.
Heat, dust and thin oil finish the job. That is why a worn set is so common on old tractors.
Straight teeth or spiral teeth
Older sets often have straight bevel teeth. They are simple and cheap to cut. Newer sets use spiral teeth. More teeth touch at once, so the drive is quieter and carries more load.
We make both. If your old set is straight cut, we copy it straight. If you want a quieter axle and the housing allows it, we can advise a spiral set. Tell us the machine and how it is used, and we suggest the right one.
Signs your set is failing
You can read most faults by ear and feel:
- A whine that rises with speed means the mesh or the backlash is off.
- A clunk when you press or release the drive means worn teeth or a loose pinion.
- Metal flakes in the oil mean the hard faces are breaking up.
- Play at the wheels with the drive held means the teeth are thin.
Gear ke dante ghis gaye to aawaz sabse pehle aati hai. Catch it early and you save the rest of the axle.
Replacing the set the right way
A crown wheel and pinion is sold and fitted as a matched pair. Never mix an old pinion with a new wheel. They wear into each other, so a mixed pair never meshes right.
Set the backlash and the contact pattern when you fit it. Mark the teeth with paste, run it, and read where the two meet. The mark should sit in the middle of the tooth, not at the edge. Then set the pinion depth with the shims.
Do this and the new set runs quiet and lasts. Skip it and the best gear in the world will howl.
Making a new set from a sample
Many old tractors have no drawing and no part number. That is fine. We copy from the worn set.
From the old crown wheel and pinion we take the tooth count, the module, the pitch angle, the pinion offset and the bore. Drawing ya sample se banate hain, dono chalta hai. We cut the new pair and check the contact before it leaves.
Teeth cutting and job work
Some workshops bring a blank or a forging and want only the cutting done. We take that on as gear cutting job work: bevel generation, hobbing, keyway cutting and grinding.
To see the full range, look at all our gears or the crown bevel gear page.
Cost and lead time
Price depends on size, steel and the finish you need. A small car set is modest. A large tractor set is more.
Send a photo on WhatsApp with the tooth counts. Same day quote milta hai. Delivery is 1 to 2 days for most sets. For very large forged crown wheels we check stock and discuss the time.
We supply across Punjab, Chandigarh, Haryana, Himachal and Delhi NCR, and send gears all over India by transport.
FAQ
Sirf crown wheel mil sakta hai, pinion ke bina?
Better not. The pair wears together, so we make and supply both as a set.
Kitne din mein mil jayega?
Most sets in 1 to 2 days. Bade forged set ke liye hum baat karke batate hain.
Can you copy a set with broken teeth?
Yes. A few good teeth and the bore are usually enough.
Which steel do you use?
Usually EN353 or 20MnCr5 for axle sets. Hum material aapke kaam ke hisaab se chunte hain.
Do you set the contact pattern?
Yes. We check it before the set leaves the shop.
Talk to us
Parkash Gears, 528, Oswal Street, Miller Ganj, Ludhiana, Punjab 141003.
Call or WhatsApp Ashok Goyal: +91 9915280866, +91 8146400866
Manufacturing gears since 1952. MSME (Udyam) registered.
