Electric cylinder system

{
  "publication_number": "US9415557B2",
  "country": "US",
  "kind": "B2",
  "title": "Electric cylinder system",
  "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.",
  "claims": [
    "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."
  ],
  "description_excerpt": "The present invention relates to an electric cylinder system including an electric cylinder that converts a rotary motion of a motor into a liner motion.\n\nIn the past, as an electric cylinder used in various kinds of apparatuses, for example, there is an electric cylinder described in Japanese Patent Application Laid-Open Publication No. 08-117970 and CN1074820C. This electric cylinder includes a piston attached to a ball nut screwed with a screw stock, a motor that controls to rotate the screw stock, a hollow rod provided on the front surface of the piston, and a supporting member inserted into a hollow portion of the hollow rod and rotatably provided at the distal end of the screw stock. Urethane rubber is attached to a rod head at the distal end of the hollow rod via an attachment plate. A metal protection plate is provided at the distal end of this urethane rubber. This electric cylinder is robust against high temperature and can weaken impact. Therefore, the electric cylinder is suitable for use in a push-out apparatus that pushes out a heavy and hot object and a receiving apparatus that receives the object.\n\nAs an electric cylinder system using an electric cylinder or the like, for example, there is an electric cylinder system described in Japanese Patent Application Laid-Open Publication No. 2005-254290. This electric cylinder system includes, as shown in FIG.",
  "cpc": [
    "B30B 1/181",
    "B30B 1/18",
    "B30B 15/00",
    "B30B 15/0094",
    "B30B 15/148",
    "F16H 2025/2081",
    "F16H 25/20",
    "F16H 25/2015"
  ],
  "ipc": [
    "B30B 1/18",
    "B30B 15/14",
    "B30B 15/00",
    "F16H 25/20"
  ],
  "assignees": [
    "Sintokogio Ltd"
  ],
  "inventors": [
    "Kyoji Furukawa",
    "Shigeyuki Takagi"
  ],
  "filing_date": "2012-01-06",
  "publication_date": "2016-08-16",
  "grant_date": "2016-08-16",
  "priority_date": "2011-01-13",
  "application_number": "US-201213979035-A",
  "family_id": "45809538",
  "cited_by_count": 7,
  "citations": [
    "US4429579A",
    "US4987528A",
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    "JPH05138481A",
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    "JPH08117970A",
    "US20030188644A1",
    "DE20108706U1",
    "DE20305789U1",
    "JP2005138110A",
    "TW200530024A",
    "JP2005254290A",
    "DE102004054836A1",
    "JP2006232062A",
    "DE102005040186A1",
    "JP2008144938A",
    "JP2009121566A",
    "CN101702930A",
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    "JP2010284768A",
    "US20150068412A1"
  ]
}