Back to results
US 8,495,924 B2Granted
Electric actuator
AssigneeSMC Corporation
InventorsYoshihiro Fukano, Toru Sugiyama, Masaki Miyahara
Life of this patent
Estimating the term…
Abstract
In an electric actuator, a connector is coupled to one end of a screw shaft that makes up a displacement mechanism, the screw shaft being rotatably supported by first and second bearings. Further, on the other end of the screw shaft, a support ring is disposed through a holder, wherein the support ring is slidable along an inner circumferential surface of a piston rod. On the outer circumferential surface of a piston, a rotation-stopping member is provided, which includes projections thereon that project in a radial direction from the outer circumferential surface, the projections being inserted into grooves of said body.
Claims27
An electric actuator comprising:
- a body extending along an axial direction;
- a driving section driven rotatably under supply of an electric current thereto;
- a drive force transmission mechanism connected to the driving section for transmitting a drive force from the driving section;
- a displacement mechanism disposed on the body and including a screw shaft, which is rotatably displaced by the drive force transmitted through the drive force transmission mechanism, and a displacement member, which is screw-engaged with the screw shaft and displaced along an axial direction of the body;
- a connecting member coupled to one end of the screw shaft and connected to the drive force transmission mechanism by being rotatably supported by first and second bearings;
- a support mechanism for supporting the screw shaft in a radial direction;
- and
- a rotation regulating mechanism formed separate and detachable from the displacement member and fitted onto an outer circumferential surface of the displacement member, which is engaged in a groove of the body and regulates rotational displacement of the displacement member, the rotation regulating mechanism including a ring-shaped base portion and plural pairs of projections that project from the ring-shaped base portion along the axial direction to extend from the ring-shaped base portion along the axial direction, each projection including a first section contacting the ring-shaped base portion and a second section projecting along the axial direction beyond the ring-shaped base portion,
- wherein the support mechanism is disposed on an end of the screw shaft opposite to the end of the screw shaft to which the connecting member is coupled.
6 more elements
An electric actuator comprising:
- a body;
- a driving section driven rotatably under supply of an electric current thereto;
- a drive force transmission mechanism connected to the driving section for transmitting a drive force from the driving section;
- a displacement mechanism disposed on the body and including a screw shaft, which is rotatably displaced by the drive force transmitted through the drive force transmission mechanism, and a displacement member, which is screw-engaged with the screw shaft and displaced along an axial direction of the body;
- a connecting member coupled to one end of the screw shaft and connected to the drive force transmission mechanism by being rotatably supported by first and second bearings;
- a support mechanism for supporting the screw shaft in a radial direction;
- and
- a rotation regulating mechanism fitted onto an outer circumferential surface of the displacement member, which is engaged in a groove of the body and regulates rotational displacement of the displacement member, the rotation regulating mechanism including a ring-shaped base portion and plural pairs of projections that project from the ring-shaped base portion,
- wherein the support mechanism is disposed on an end of the screw shaft opposite to the end of the screw shaft to which the connecting member is coupled,
- wherein the support mechanism comprises a ring body that is disposed rotatably with respect to the screw shaft, wherein the ring body is slidably disposed inside an inner circumferential surface of a rod coupled to the displacement member,
- wherein the ring body is retained in a holder disposed on an inner circumferential side of the ring body, and the holder is affixed by shrink-fitting or press-fitting with respect to the screw shaft,
- wherein the ring body includes a plurality of support members projecting in a radial outward direction from an outer circumferential surface of the holder, the support members being separated at equal intervals along a circumferential direction of the ring body.
9 more elements
An electric actuator, comprising:
- a body;
- a driving section driven rotatably under supply of an electric current thereto;
- a drive force transmission mechanism connected to the driving section for transmitting a drive force from the driving section;
- a displacement mechanism disposed on the body and including a screw shaft, which is rotatably displaced by the drive force transmitted through the drive force transmission mechanism, and a displacement member, which is screw-engaged with the screw shaft and displaced along an axial direction of the body;
- a connecting member coupled to one end of the screw shaft and connected to the drive force transmission mechanism by being rotatably supported by first and second bearings;
- a support mechanism for supporting the screw shaft in a radial direction;
- and
- a rotation regulating mechanism fitted onto an outer circumferential surface of the displacement member, which is engaged in a groove of the body and regulates rotational displacement of the displacement member, the rotation regulating mechanism including a ring-shaped base portion and plural pairs of projections that project from the ring-shaped base portion,
- wherein the support mechanism is disposed on an end of the screw shaft opposite to the end of the screw shaft to which the connecting member is coupled,
- wherein the rotation regulating mechanism comprises:
- a base section installed on the outer circumferential surface of the displacement member;
- and
- projections that project in a radial outward direction with respect to the outer circumferential surface of the displacement member and an outer circumferential surface of the base section, and which extend along an axial direction of the displacement member,
- wherein the projections include spring sections, which are biased in a radial outward direction with respect to the displacement member.
11 more elements
Dependencies are inferred from the claim text.