Electric cylinder system

Patent metadata

Field	Value
Publication number	US-9415557-B2
Application number	US-201213979035-A
Country	US
Kind code	B2
Filing date	Jan 6, 2012
Priority date	Jan 13, 2011
Publication date	Aug 16, 2016
Grant date	Aug 16, 2016

Abstract

An electric cylinder system includes: an electric cylinder; and a control section that controls the electric cylinder. The electric cylinder includes: an outer cylinder; a rod configured to be capable of extending and retracting in an axis direction from an opening on one end side of the outer cylinder; a bearing provided on the inside of the outer cylinder; a rotating shaft rotatably supported by the bearing and driven to rotate with driving force of a motor; a screw mechanism that converts a rotary motion of the rotating shaft into a linear motion of the rod and transmits the linear motion; and a load detecting section that detects a load in an axis direction applied to the rod in a position where the load is transmitted from the rod through the screw mechanism. The control section controls the electric cylinder on the basis of a signal from an encoder of the motor and a signal from the load detecting section.

First claim

The invention claimed is:

1. An electric cylinder system comprising;
an electric cylinder; and
a control section that controls the electric cylinder, wherein
the electric cylinder includes: an outer cylinder; a rod configured to be capable of extending, and retracting in an axis direction from an opening on one end side of the outer cylinder; a bearing provided on an inside of the outer cylinder; a rotating shaft rotatably supported by the bearing and driven to rotate with driving force of a motor; a screw mechanism that converts a rotary motion of the rotating shaft into linear motion of the rod and transmits the linear motion; and a load detecting section that detects a load in an axis direction applied to the rod in a position where the load is transmitted from the rod through the screw mechanism,
the control section controls the electric cylinder on the basis of a signal from an encoder of the motor and a signal from the load detecting section,
the outer cylinder includes, on the one end side, a fixing section for fixing the electric cylinder to an attachment place, and
the load detecting section is a strain gauge provided in a position on an outer circumference of the outer cylinder and between a position where the bearing is provided and the fixing section.

2. The electric cylinder system according to claim 1 , wherein the strain gauge detects a load in the axis direction applied to a portion between an attachment position of the bearing in the outer cylinder and the fixing section and converts the load into an electric signal.

3. The electric cylinder system according to claim 2 , wherein the outer cylinder is formed in a thin shape having a reduced outer diameter of a portion where the strain gauge is attached.

4. The electric cylinder system according to claim 3 , wherein the outer cylinder is made of a metal material and formed as a single member.

5. The electric cylinder system according to claim 4 , wherein the screw mechanism is a ball screw.

Assignees

• Furukawa Kyoji
• Takagi Shigeyuki
• Sintokogio Ltd

Inventors

• Furukawa Kyoji
• Takagi Shigeyuki

Classifications

• B30B1/18

  by screw means {(B30B9/3064 takes precedence)} · CPC title

• F16H25/20 Primary

  Screw mechanisms (with automatic reversal F16H25/12) · CPC title

• F16H2025/2081

  Parallel arrangement of drive motor to screw axis · CPC title

• B30B15/0094

  Press load monitoring means (B30B15/281 takes precedence) · CPC title

• B30B15/148

  Electrical control arrangements · CPC title