The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 28, 2025
Filed:
Dec. 10, 2021
Hitachi Astemo, Ltd., Hitachinaka, JP;
Kinichi Hashimoto, Hitachinaka, JP;
Keisuke Kitamura, Hitachinaka, JP;
HITACHI ASTEMO, LTD., Hitachinaka, JP;
Abstract
A rolling machine has a rolling diethat forms a male screw by pressing a steering shaftwhich is an object to be rolled and plastically deforming an outer peripheral surface of the steering shaftwhile rotating in contact with the outer peripheral surface of the steering shaft, a main spindleinserted into a penetration holeof the rolling dieand transmitting a rotation force to the rolling die, a key groove and a key which restrict a relative rotation between the rolling dieand the main spindle, a spiral oil grooveprovided on an inner peripheral surface of the penetration holeor an outer peripheral surface of the main spindle and extending from one end portionside in an axial direction of the penetration hole in an inner axial direction of the penetration hole.