Backlash elimination straight tooth cylindrical gear

Abstract

A backlash elimination straight tooth cylindrical gear comprises a main gear 1, an auxiliary gear 2, fixture blocks 3 and springs 4, wherein the main gear 1 is provided with a cylindrical boss coaxialwith the main gear 1, and sliding surfaces 1-1 are machined out on the cylindrical boss; the auxiliary gear 2 is provided with a big hole 2-1, spring holes 2-2 are formed in the wall of the big hole2-1, and the cylindrical boss of the main gear 1 is inserted into the big hole 2-1 of the auxiliary gear 2; each fixture block 3 is provided with a bottom surface 3-1, an arc surface 3-2 and a concavepit 3-3, the bottom surfaces 3-1 of the fixture blocks 3 are in sliding contact with the sliding surfaces 1-1 of the main gear 1, the arc surfaces 3-2 of the fixture blocks 3 are in sliding contact with the wall face of the big hole 2-1 of the auxiliary gear 2, and the distance from the side, close to each concave pit 3-3, on the arc surface 3-2 to the bottom surface 3-1 is larger than the distance from the opposite side to the bottom surface 3-1; and the springs 4 are compressed springs, and the two ends of the springs 4 are embedded into the spring holes 2-2 of the auxiliary gear 2 and theconcave pits 3-3 of the fixture blocks 3 separately. The backlash elimination straight tooth cylindrical gear has the advantages that transmission force is not limited by elastic force of the springs,gear backlash can be automatically compensated after gear tooth abrasion, and the structure is simple.

Description

Technical field [0001] The invention relates to the technical field of gear transmission, in particular to an anti-backlash spur gear. Background technique [0002] Gear and gear meshing has tooth side clearance. When the gear transmission pair needs to rotate forward and backward, a certain amount of backlash will be generated, which reduces the transmission accuracy. Therefore, in devices that require precise transmission, gears that can eliminate backlash must be used to eliminate backlash. Anti-backlash spur gear is a commonly used gear that can eliminate backlash. The patent application number CN201220072972.8 describes the basic structure of the anti-backlash spur gear. Two identical gear pieces are designed at one end of the spur gear transmission pair, and the two gear pieces are assembled in parallel axially, and the two gear pieces are connected by a spring. , Using the elastic force of the spring to make the two gears rotate relative to each other, the tooth profiles...

AI Technical Summary

Problems solved by technology

However, the backlash-eliminating spur gear of this structure has the following disadvantages: ①The transmission force is limited by the elastic force of the spring. If the transmission force exceeds the elastic force, backlash will still occur; Tight connection, the transmission force is not limited to the elastic force of the spring

But in this way, the automatic compensation function of the tooth side clearance will be lost. After the tooth profile is worn out after long-term operation, a new tooth side clearance will be generated.

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