Rotary damper

Patent metadata

Field	Value
Publication number	US-10823247-B2
Application number	US-201716301600-A
Country	US
Kind code	B2
Filing date	May 11, 2017
Priority date	May 23, 2016
Publication date	Nov 3, 2020
Grant date	Nov 3, 2020

Abstract

Provided is a rotary damper that makes it possible to easily adjust braking torque. A rotary damper that has a partitioning part and first and second adjustment bolts. The partitioning part has: first and second flow paths that connect regions of a partitioned cylindrical chamber; a first insertion hole that connects to the first flow path and to a first adjustment bolt screw hole of a case; and a second insertion hole that connects to the second flow path and to a second adjustment bolt screw hole of the case. The first adjustment bolt is screwed into the first adjustment bolt screw hole and is thereby inserted into the first insertion hole, and the length to which it protrudes into the first flow path can be adjusted. The second adjustment bolt is screwed into the second adjustment bolt screw hole and is thereby inserted into the second insertion hole, and the length to which it protrudes into the second flow path can be adjusted.

First claim

The invention claimed is:

1. A rotary damper for generating braking torque against applied rotating force by limiting movement of viscous fluid, comprising:
a case which has: a cylindrical chamber filled with the viscous fluid; and a fan-shaped partitioning part provided along a center line of the cylindrical chamber, with an inner peripheral surface of the partitioning part being directed inward in a radial direction, to partition an inside of the cylindrical chamber;
a rotor which has: a rotor body received in the cylindrical chamber rotatably relative to the cylindrical chamber, so that an outer peripheral surface of the rotor body is close to the inner peripheral surface of the partitioning part; and a vane formed along the center line of the cylindrical chamber, to protrude outward in a radial direction from an outer peripheral surface of the rotor body, so that an end surface of the vane is close to an inner peripheral surface of the cylindrical chamber;
a lid which is fixed to an opening part of the cylindrical chamber, to confine the rotor together with the viscous fluid in the cylindrical chamber;
a first flow path which is provided in the partitioning part and connects regions in the cylindrical chamber partitioned by the partitioning part;
a first insertion hole which pierces a side wall of the first flow path and an outer peripheral surface of the case; and
a first adjustment means which is inserted into the first insertion hole and can change a protrusion length into the first flow path while closing the first insertion hole, wherein:
the rotary damper comprises at least two partition blocks stacked along the center line of the cylindrical chamber; and
the first flow path and the first insertion hole are each made up of grooves formed in respective opposed surfaces of two partition blocks adjacent to each other in a height direction among the at least two partition blocks.

2. A rotary damper of claim 1 , wherein:
the first adjustment means is an adjustment screw that is screwed into a screw hole working as the first insertion hole.

3. A rotary damper for generating braking torque against applied rotating force by limiting movement of viscous fluid, comprising:
a case which has: a cylindrical chamber filled with the viscous fluid; and a fan-shaped partitioning part provided along a center line of the cylindrical chamber, with an inner peripheral surface of the partitioning part being directed inward in a radial direction, to partition an inside of the cylindrical chamber;
a rotor which has: a rotor body received in the cylindrical chamber rotatably relative to the cylindrical chamber, so that an outer peripheral surface of the rotor body is close to the inner peripheral surface of the partitioning part; and a vane formed along the center line of the cylindrical chamber, to protrude outward in a radial direction from an outer peripheral surface of the rotor body, so that an end surface of the vane is close to an inner peripheral surface of the cylindrical chamber;
a lid which is fixed to an opening part of the cylindrical chamber, to confine the rotor together with the viscous fluid in the cylindrical chamber;
a first flow path which is provided in the partitioning part and connects regions in the cylindrical chamber partitioned by the partitioning part;
a first insertion hole which pierces a side wall of the first flow path and an outer peripheral surface of the case;
a first adjustment means which is inserted into the first insertion hole and can change a protrusion length into the first flow path while closing the first insertion hole; and
a first check valve which opens the first flow path when the rotor rotates relative to the cylindrical chamber in a first rotation direction, and closes the first flow path when the rotor rotates relative to the cylindrical chamber in a second rotation direction reverse to the first rotation direction, wherein:
the rotary damper comprises at least two partition blocks stacked along the center line of the cylindrical chamber; and
the first flow path and the first insertion hole are each made up of grooves formed in respective opposed surfaces of two partition blocks adjacent to each other in a height direction among the at least two partition blocks.

4. A rotary damper of claim 3 , wherein:
the first adjustment means is an adjustment screw that is screwed into a screw hole working as the first insertion hole.

5. A rotary damper for generating braking torque against applied rotating force by limiting movement of viscous fluid, comprising:
a case which has: a cylindrical chamber filled with the viscous fluid; and a fan-shaped partitioning part provided along a center line of the cylindrical chamber, with an inner peripheral surface of the partitioning part being directed inward in a radial direction, to partition an inside of the cylindrical chamber;
a rotor which has: a rotor body received in the cylindrical chamber rotatably relative to the cylindrical chamber, so that an outer peripheral surface of the rotor body is close to the inner peripheral surface of the partitioning part; and a vane formed along the center line of the cylindrical chamber, to protrude outward in a radial direction from an outer peripheral surface of the rotor body, so that an end surface of the vane is close to an inner peripheral surface of the cylindrical chamber;
a lid which is fixed to an opening part of the cylindrical chamber, to confine the rotor together with the viscous fluid in the cylindrical chamber;
a first flow path which is provided in the partitioning part and connects regions in the cylindrical chamber partitioned by the partitioning part;
a first insertion hole which pierces a side wall of the first flow path and an outer peripheral surface of the case;
a first adjustment means which is inserted into the first insertion hole and can change a protrusion length into the first flow path while closing the first insertion hole;
a second flow path which is provided in the partitioning part and connects the regions in the cylindrical chamber partitioned by the partitioning part;
a second check valve which closes the second flow path when the rotor rotates relative to the cylindrical chamber in the first rotation direction, and opens the second flow path when the rotor rotates relative to the cylindrical chamber in the second rotation direction;
a second insertion hole which pierces a side wall of the second flow path and the outer peripheral surface of the case; and
a second adjustment means which is inserted into the second insertion hole and can change a protrusion length into the second flow path while closing the second insertion hole, wherein:
the partitioning part comprises at least three partition blocks stacked along the center line of the cylindrical chamber;
the first flow path and the first insertion hole are each made up of grooves formed in respective opposed surfaces of two partition blocks adjacent to each other in a height direction among the at least three partition blocks;
the second flow path and the second insertion hole are each made up of grooves formed in respective opposed surfaces of two partition blocks adjacent to each other in a height direction, at least one of which is not one of the partition blocks in which the grooves making up the first flow path and the first insertion hole are formed, among the at least three partition blocks.

6. A rotary damper of claim 5 , wherein:
the second adjustment means is an adjustment screw that is screwed into a screw hole working as the second insertion hole.

7. A rotary damper of claim 6 , wherein:
the first adjustment means is an adjustment screw that is screwed into a screw hole working as the first insertion hole.

8. A

Assignees

• Oiles Industry Co Ltd

Inventors

• Kaneko Ryohei

Classifications

• F16F9/44 Primary

  Means on or in the damper for manual or non-automatic adjustment; such means combined with temperature correction (F16F9/53, {F16F13/26} take precedence; temperature correction only F16F9/52) · CPC title

• F16F9/14

  Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect · CPC title

• E05Y2201/266

  rotary · CPC title

• F16F9/145 Primary

  involving only rotary movement of the effective parts (wing closers or openers with fluid brakes of the rotary type E05F3/14) · CPC title