It is subdivided into backlash, normal backlash, backlash meshing gear tooth backlash; the non-working side of the normal backlash device at a short distance is in contact with the tooth surfaces of the two working gears; circumferential backlash refers to the two fixed The length of the other rotatable wheels is a ring gear with a greater value of the arc part; the backlash engagement device, when a pair in the engaged position theoretically meshes with the cycloidal gear, the pin tooth is used in the core Node, the metric connection of the needle between the cycloidal tooth profile and the short distance of the tooth profile.

When the cycloidal gear teeth and the needle gear teeth mesh at different positions, the meshing gap is not equal.Backlash refers to the amount of circumferential vibration of one gear when the other gear is fixed, and is calculated from the arc length on the index circle.

The gear side clearance can be achieved by reducing the tooth thickness.In order to meet the requirements of different backlashes, it is only necessary to specify a center-to-core distance and limit deviation. By defining the various and deviations of the tooth thickness, the corresponding backlash of the gear pair can be obtained.On the contrary, only one tooth thickness and limit deviation can be specified, and various center pitches and limit deviations can be designated to obtain various gear pair backlashes. Same as the shaft hole matching reference system, the former can be called a basic center pitch system The latter is called the base tooth thickness system, because the thinning of the tooth thickness in the cutting teeth is easier to achieve.

Refers to the tooth thickness between the teeth on both sides of the length of the arc of any circumferential tooth profile called the tooth thickness represented by silicon on the circumference; the tooth thickness of the standard gear in the pitch circle is usually the target tooth thickness of.The normal difference of the cylindrical surface between the actual value of the tooth thickness deviation index and the nominal value of the tooth thickness indicates the deviation of the ESS, and ESI indicates the deviation.The letters represent different tooth thickness and limit deviation codes.Different letter spacing and limit deviation are integer multiples of the figure respectively.

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