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The tooth surface area hardness, it is divided into gentle tooth surface equipment transmission and hard tooth floor equipment transmission. When the tooth floor hardness of the two wheels (or one of them) is significantly less than or equivalent to 350HBW, it is referred to as comfortable tooth surface transmission when the tooth surface area hardness of the two wheels is >350HBW, it is known as challenging tooth surface area transmission. Delicate-tooth surface equipment transmission is frequently employed for common minimal-speed equipment transmission that does not demand high precision, and difficult-toothed area equipment transmission is typically utilised for gear transmission that demands powerful bearing ability and compact composition.
Racks are utilised to change rotary movement into linear motion. The spur enamel of the rack minimize into 1 experience of the square or round rod segment and operate with the pinion, which is a tiny cylindrical gear that meshes with the rack. Typically, racks and pinions are collectively referred to as “rack and pinion”.

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