Ball screw device, machine component manufacturing method, machine manufacturing method, vehicle manufacturing method, machine component, machine, vehicle, hydraulic forming method, and hydraulic forming die

Patent metadata

Field	Value
Publication number	US-12234894-B2
Application number	US-202117928849-A
Country	US
Kind code	B2
Filing date	Aug 13, 2021
Priority date	Aug 19, 2020
Publication date	Feb 25, 2025
Grant date	Feb 25, 2025

Abstract

A ball screw device includes a nut ( 3 ), a screw shaft, and a plurality of balls arranged between the nut ( 3 ) and the screw shaft. The nut ( 3 ) includes a first member ( 11 ) disposed to surround the screw shaft, a second member ( 10 ) disposed between the screw shaft and the first member ( 11 ), and a third member ( 12 ) disposed between the first member ( 11 ) and the second member ( 10 ). The third member ( 12 ) includes a laminate body ( 12 A) having a plurality of plates ( 22 a, 22 b ) laminated in an axial direction. The laminate body ( 12 A) includes an inner surface facing an outer surface of the second member ( 10 ). The inner surface of the laminate body ( 12 A) has a shape corresponding to a shape of the outer surface of the second member ( 10 ).

First claim

The invention claimed is:

1. A machine component manufacturing method comprising:
preparing a forming die with a laminate body having a plurality of plates laminated in an axial direction, the laminate body including an inner surface for a forming;
disposing a process material on the inside of the forming die;
plastically deforming the process material toward the inner surface of the forming die by applying a hydraulic pressure to an inner surface of the process material; and
assembling (a) the plastically deformed process material and (b) the laminate body used as the forming die when the process material was plastically deformed.

2. A machine component manufactured by the manufacturing method according to claim 1 ,
wherein the machine component comprises (a) the plastically deformed process material and (b) the laminate body used as the forming die when the process material was plastically deformed.

3. A machine comprising:
a body; and
the machine component according to claim 2 .

4. A vehicle comprising:
a body; and
the machine component according to claim 2 .

5. A machine manufacturing method comprising:
manufacturing a machine component by using the manufacturing method according to claim 1 , and
assembling the machine component to a body.

6. A vehicle manufacturing method comprising:
manufacturing a machine component by using the manufacturing method according to claim 1 , and
assembling the machine component to a body.

7. A hydraulic forming method comprising:
preparing a tubular forming die with a laminate body having a plurality of plates laminated in an axial direction, the laminate body including an inner peripheral surface for a forming;
disposing a process material on the inside of the tubular forming die; and
plastically deforming the process material toward the inner peripheral surface of the tubular forming die by applying a hydraulic pressure to an inner surface of the process material,
the inner peripheral surface of the laminate body includes a plurality of steps, each of the steps being based on a difference in inner surface height of two adjacent plates,
a contour of an outer surface of the plastically deformed process material has a curved shape, and
a curved line connecting a plurality of corners of the steps has a shape substantially matching the curved shape of the plastically deformed process material.

Assignees

• Nsk Ltd

Inventors

• Yamamoto Masahito

Classifications

• F16H25/24

  Elements essential to such mechanisms, e.g. screws, nuts (F16H25/22 takes precedence) · CPC title

• B21D26/033

  Deforming tubular bodies (corrugating tubes by applying fluid pressure B21D15/03, B21D15/10) · CPC title

• B21D15/10

  by applying fluid pressure · CPC title

• F16H2025/2481

  Special features for facilitating the manufacturing of spindles, nuts, or sleeves of screw devices · CPC title

• B21D26/047

  Mould construction (B21D26/037 - B21D26/045 take precedence) · CPC title