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Their advantage over the helical gears is that the side-thrust of one half is balanced by that of the other half. This means that herringbone gears can be used in torque gearboxes without requiring a substantial thrust bearing.
VTC Gear. 1  The main gear, which actually comes into contact with the timing belt. The inside of the gear housing had helical teeth all the way around the inside of it. 2  The Inner Shaft. This part connects directly to the camshaft and has a helical teeth all the way around the outside of it. 3  The Helical piston.