Reversing Gear Manufacturer,Supplier and Exporter in India
Product Code : EL-DOMLE-9151
Jlab Export is a leading Reversing Gear Manufacturer,and suppliers in India
A reversing gear controls the direction of travel of a steam locomotive. It also adjusts the cut-off, the point in each piston stroke where steam stops entering the cylinder. This reversing gear is used in theory of machines and dynamics of machines teaching to show how one control does both jobs.
Specifications
| Function | Controls the direction of travel of a steam locomotive |
| Second function | Adjusts the steam cut-off |
| Minimum order quantity | 10 units |
| Dispatch time | Usually 4–6 working days |
| Manufacturer | JLab (Jain Laboratory Instruments Pvt Ltd), Ambala, India |
How a Locomotive Reversing Gear Works
The reversing gear is linked to the valve gear. Moving it from full forward toward mid gear shortens the valve travel, so steam is cut off earlier in the stroke and does more work by expanding. At mid gear the valve travel is smallest and the engine gives little or no power. Moving past mid gear reverses the valve events, and the locomotive runs the other way.
Classroom Demonstrations of Reversing Gear
Teachers can use the gear to show the three main settings, full forward, mid gear and full reverse, and how cut-off changes between them. Students sketch the valve gear in each setting and note which way the locomotive would move.
The lesson fits well after the Steam Engine Model, which shows the parts and working of a steam engine. Comparing it with the Valve Timing Diagram lets students see how steam and internal combustion engines each time their valves.
Frequently Asked Questions
What does a reversing gear do on a steam locomotive?
It sets the direction of travel by shifting the valve gear, so steam is admitted to the correct side of each piston for forward or reverse running. The same control also adjusts the cut-off.
What is cut-off?
Cut-off is the point in the piston stroke at which the valve stops admitting steam to the cylinder. A long cut-off gives the most pull when starting, and a short cut-off lets the steam expand and saves steam at speed.
What is mid gear?
Mid gear is the central position of the reversing gear, between forward and reverse. There the valve travel is at its smallest and the engine gives little or no power, so the driver passes through it when changing direction.
Is this the same as reverse gear in a car gearbox?
No. A car gearbox reverses the output by adding an idler gear to the gear train. A locomotive reversing gear acts on the valve gear instead, changing when steam enters each end of the cylinder, and it also sets the cut-off.
Other Locomotive and Gear Models
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Last updated: 5 November 2026
