Double lug boss type internal spline shaft pushed angle adjustor

Abstract

The invention discloses a double lug boss type internal spline shaft pushed angle adjustor, which comprises a back connecting plate (1), a sealing cover (2), an internal toothed plate (3), an internal spline shaft (4), lug bosses (41), a push ring (5), a rabbet (51), a tension spring (6), rivets (7), a wedge-shaped arch (8), a seat cover plate (9), an outer toothed plate (10), a shaft sleeve (11)and a seat connecting plate (12). By adopting the technical scheme that fan-shaped lug bosses which mutually form a 180-degree central angle are arranged on the internal spline shaft to form double lug bosses and the double lug bosses push the push ring (5) and the wedge-shaped arch (8) to rotate an eccentric wheel, the defect that the internal spline shaft of a single lug boss is easy to fatiguedue to radial component forces pointing to the shaft center during stressing in the prior art is overcome. According to the double lug boss type internal spline shaft pushed angle adjustor, the internal spline shaft fulfills the purposes of stressed symmetric equilibrium and fatigue fracture avoidance through the push of the double lug bosses.

Description

technical field [0001] The invention relates to a car seat recliner, specifically a double-convex table type internal spline shaft that adopts a parallel shaft type planetary gear reduction mode with one less tooth and is used to adjust the angle between the backrest and the seat cushion of a car seat. recliner. Background technique [0002] Car seat recliner, according to the principle of parallel shaft "one-tooth difference" planetary gear reducer, the angle adjustment motor drives the outer gear plate to mesh with the inner gear plate for cycloidal motion to obtain a large reduction ratio, through the inner gear plate and the outer gear The angle adjustment between the seat back and the seat cushion can be realized by changing the included angle of the board. [0003] The inner spline shaft of the prior art car seat recliner is provided with a boss, and two eccentric wedge blocks are arranged on both sides of the boss to form an eccentric wheel, and the eccentric wheel c...

AI Technical Summary

Problems solved by technology

[0003] The inner spline shaft of the prior art car seat recliner is provided with a boss, and two eccentric wedge blocks are arranged on both sides of the boss to form an eccentric wheel, and the eccentric wheel converts the rotation of the inner spline shaft into driving outer The gear rotates around the planetary deceleration of the inner gear; because only one boss of the inner spline shaft is stressed during transmission, the force is unbalanced, and when it rotates, a radial component force pointing to the center of the shaft will be generated. Over time, the inner spline shaft The root of the boss is prone to mechanical fatigue fracture, and then produces failure; therefore, the internal spline shaft of the prior art has the problems and deficiencies of uneven stress and prone to fatigue fracture

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