Hydraulic cylinder
AssigneeSMC Corporation
InventorTsukasa Odaka
Life of this patent
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Abstract
A hydraulic cylinder (10) comprises a cylinder tube (12) having a circular slide hole (13), a piston unit (18), and a piston rod (20). The piston unit (18) has a circular piston body (40), packing (42) that is installed on the outer circumferential portion of the piston body (40), a movable member (44) that is mounted to the outer circumferential portion of the piston body (40) so as to be able to rotate relative to the piston body (40), and a magnet (46) that is held by a magnet holding unit (58) of the movable member (44). Relative rotation of the movable member (44) with respect to the cylinder tube (12) is regulated.
Claims5
A fluid pressure cylinder comprising:
- a cylinder tube including a slide hole with a circular shape inside the cylinder tube;
- a piston unit disposed to be reciprocable along the slide hole;
- and
- a piston rod protruding from the piston unit in an axial direction;
- wherein the piston unit includes:
- a piston body with a circular shape protruding radially outward from the piston rod;
- a packing attached to an outer circumferential part of the piston body and brought into slidable contact with an inner circumferential surface of the cylinder tube;
- a movable member including a magnet holding portion and mounted at the outer circumferential part of the piston body to be rotatable relative to the piston body;
- and
- a magnet held by the magnet holding portion and disposed in the piston body at a discrete location which is less than an entirety of a circumferential extent of the piston body, wherein:
- the piston rod is rotatable relative to the cylinder tube;
- and
- rotation of the movable member relative to the cylinder tube is restricted,
- a magnet arrangement groove with an annular shape is formed in the outer circumferential part of the piston body;
- and
- the magnet holding portion is fitted in the magnet arrangement groove.
A fluid pressure cylinder comprising:
- a cylinder tube including a slide hole with a circular shape inside the cylinder tube;
- a piston unit disposed to be reciprocable along the slide hole;
- and
- a piston rod protruding from the piston unit its an axial direction;
- wherein the piston unit includes:
- a piston body with a circular shape protruding radially outward from the piston rod;
- a packing attached to an outer circumferential part of the piston body and brought into slidable contact with an inner circumferential surface of the cylinder tube;
- a movable member including a magnet holding portion and mounted at the outer circumferential part of the piston body to be rotatable relative to the piston body;
- and
- a magnet held by the magnet holding portion and disposed in the piston body at a discrete location which is less than an entirety of a circumferential extent of the piston body, wherein:
- the piston rod is rotatable relative to the cylinder tube;
- and
- rotation of the movable member relative to the cylinder tube is restricted,
- a detent groove is provided in the inner circumferential surface of the cylinder tube in an axial direction of the cylinder tube;
- and
- the movable member is provided with a detent protrusion fitted in the detent groove.
Dependencies are inferred from the claim text.