Rotary actuator

The rotary actuator addresses gear deformation and efficiency loss by using a ring gear with less rigid cylindrical and connecting portions to absorb press-fitting forces, ensuring stable assembly and operation.

JP7875454B2Active Publication Date: 2026-06-18DENSO CORP
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
DENSO CORP
Filing Date
2023-01-25
Publication Date
2026-06-18

AI Technical Summary

⚠Technical Problem

Conventional rotary actuators experience gear deformation and reduced efficiency due to the press-fitting of the ring gear, which tilts radially inward, causing gear tooth shape deformation and potential gear lock.

⚗Method used

The rotary actuator design includes a ring gear with a cylindrical portion and gear teeth formed on the radially inner side, featuring folded portions and a press-fit diameter portion held by a retaining plate, where the cylindrical portion and connecting portion have less rigidity than the gear teeth, absorbing the press-fitting allowance to prevent gear deformation.

🎯Benefits of technology

This design effectively suppresses gear tooth deformation during assembly, maintaining gear efficiency and preventing gear lock by absorbing the press-fitting allowance through less rigid outer portions.

✦ Generated by Eureka AI based on patent content.

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Abstract

To provide a rotary actuator capable of suppressing deformation of a gear at the time of assembling.SOLUTION: An actuator 10 includes a motor 30, a reduction gear 40, and a housing 20. The reduction gear 40 includes a ring gear 51 having a gear tooth part 511 formed in a cylinder part 512 and inside in the radial direction of the cylinder part 512, and reduces the speed of the rotation of the motor 30 and outputs it from an output shaft 45. At the housing 20, the cylinder part 512 of the ring gear 51 is press-fitted and fixed. The ring gear 51 is formed in such a manner that, at least at part of an outside portion provided further outside in the radial direction than the gear tooth part 511, rigidity becomes smaller than that of the gear tooth part 511.SELECTED DRAWING: Figure 1
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