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US 2011/0226573 A1Published application
Rotary damper
AssigneeOiles Corporation
InventorsMasamitsu Kojima, Akihiko Okimura, Yoshiteru Igarashi, Naohiro Horita
Life of this patent
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Abstract
A rotary damper 1 includes a synthetic resin-made accommodating case 4 for accommodating in its interior 2 a viscous fluid 3 which is constituted by silicone oil or the like and whose viscosity declines with a temperature rise, and a synthetic resin-made rotor 9 which is disposed in the interior 2 of the accommodating case 4 rotatably, i.e., so as to be rotatable in R1 and R2 directions about an axis O, and which partitions the interior 2 of the accommodating case 4 into at least two chambers, i.e., in this embodiment, two chambers consisting of chambers 5 and 6 and two chambers consisting of chambers 7 and 8, in cooperation with the accommodating case 4.
Claims6
A rotary damper comprising:
- an accommodating case for accommodating in its interior a viscous fluid whose viscosity declines with a temperature rise and a rotor which is disposed rotatably in the interior of said accommodating case and which partitions the interior of said accommodating case into at least two chambers in cooperation with said accommodating case,
- wherein said rotor has a rotor body which is rotatably supported in said accommodating case and an elastic vane which is provided on an outer peripheral surface of said rotor body,
- wherein said elastic vane includes a curved projecting surface which is continuously connected at one end to the outer peripheral surface of said rotor body and opposes at another end an inner peripheral surface of said accommodating case, and which forms one of the two chambers in cooperation with the inner peripheral surface of said accommodating case, and a curved recessed surface which is continuously connected at one end to the outer peripheral surface of said rotor body in correspondence with the projecting surface and extends along the projecting surface, and which forms the other one of the two chambers in cooperation with the inner peripheral surface of said accommodating case, and
- wherein the projecting surface has on its other end side a circular arc-shaped projecting surface which forms between the same and the inner peripheral surface of said accommodating case a pair of wedge spaces opposing each other in a circumferential direction, the circular arc-shaped projecting surface determines a radial width of one wedge space communicating with one of the two chambers such that the radial width of the one wedge space becomes gradually narrow toward another one of the wedge spaces in the circumferential direction, and the circular arc-shaped projecting surface determines a radial width of the other wedge space communicating with another one of the two chambers such that the radial width of the other wedge space becomes gradually narrow toward the one wedge space in the circumferential direction, and wherein the viscous fluid passing through the pair of wedge spaces is adapted to determine the radial width of the pair of wedge spaces by means of its viscosity by elastically deflecting the elastic vane.
1 more element
A rotary damper comprising:
- an accommodating case having a cylindrical inner peripheral surface;
- a rotor disposed in an interior of said accommodating case relatively rotatably with respect to said accommodating case so as to form a space for accommodating between the cylindrical inner peripheral surface of said accommodating case and a cylindrical outer peripheral surface concentric with that inner peripheral surface a viscous fluid whose viscosity declines with a temperature rise;
- and vane means disposed in the space accommodating the viscous fluid between the cylindrical inner peripheral surface of said accommodating case and the cylindrical outer peripheral surface of said rotor so as to cause large flow resistance to be generated in the viscous fluid in the relative rotation in one direction of said rotor with respect to said accommodating case and so as to cause smaller flow resistance than that flow resistance to be generated therein in the relative rotation in another direction opposite to the relative rotation in the one direction of said rotor with respect to said accommodating case,
- wherein said vane means has a pair of elastic vanes for partitioning into two chambers the space accommodating the viscous fluid between the cylindrical inner peripheral surface of said accommodating case and the cylindrical outer peripheral surface of said rotor and another elastic vane for further partitioning into two chambers at least one of the two chambers partitioned by the pair of elastic vanes,
- wherein each of the pair of elastic vanes includes a curved projecting surface which is continuously connected at its one end portion to the outer peripheral surface of said rotor and which is projecting in an opposite direction to the relative rotation in the one direction of said rotor with respect to said accommodating case, and a curved recessed surface which is continuously connected at its one end portion to the outer peripheral surface of said rotor in correspondence with the projecting surface, and which extends along the projecting surface, and
- wherein the projecting surface has on its other end portion side a circular arc-shaped projecting surface which forms between the same and the inner peripheral surface of said accommodating case a pair of wedge spaces opposing each other in a rotational direction of the relative rotation of said rotor with respect to said accommodating case, the circular arc-shaped projecting surface determines a radial width of one of the wedge spaces communicating with one of the two chambers adjacent to each other with the circular arc-shaped projecting surface therebetween in the rotational direction of the relative rotation of said rotor with respect to said accommodating case, such that the radial width of the one wedge space becomes gradually narrow toward another one of the wedge spaces communicating with another one of the chambers adjacent to each other with the circular arc-shaped projecting surface therebetween in the rotational direction of the relative rotation of said rotor with respect to said accommodating case, and the circular arc-shaped projecting surface determines a radial width of the other wedge space communicating with the other one of the two chambers adjacent to each other with the circular arc-shaped projecting surface therebetween in the rotational direction of the relative rotation of said rotor with respect to said accommodating case, such that the radial width of the other wedge space becomes gradually narrow toward the one wedge space communicating with the one of the two chambers adjacent to each other with the circular arc-shaped projecting surface therebetween in the rotational direction of the relative rotation of said rotor with respect to said accommodating case, the viscous fluid passing through the pair of wedge spaces is adapted to determine the radial width of the pair of wedge spaces by means of its viscosity by elastically deflecting each of the pair of elastic vanes.
3 more elements
Dependencies are inferred from the claim text.