Fluid pressure actuator with anti-rotation slide attached to piston rod
First Claim
1. A linear motor with a cylinder containing an axially movable piston to which a piston rod extending through at least one of the end faces of the cylinder is fitted, the section of the piston rod which is outside the cylinder being secured against torsion by being fixed to a co-moving torsion protection element movable in the axial direction of the cylinder in conjunction with a sliding guide fixed thereto, wherein the sliding guide (17) comprises at least two guide ribs (22, 22'"'"'), for example projecting substantially radially from the surface of the cylinder (5) relative to its longitudinal axis and located on the circumference of the cylinder (59), said guide ribs being arranged at a distance from each other and at least approximately extending along the entire length of the cylinder (5), and wherein the torsion protection element (18) is a slide irremovably attached to the outside of the cylinder (5) and guided flat along the guide ribs (22, 22'"'"'), said slide at least partially surrounding or encompassing the guide ribs (22, 22'"'"'), whereby, for example, the axial dimension of the slide (19) may substantially correspond to the length of the cylinder (5).
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Abstract
The invention relates to a linear motor with a cylinder (5) containing a piston linked to a piston rod (8) projecting from either of the end faces of the cylinder (5). To secure the piston rod against torsion and rotation, a guide comprising at least two guide ribs (22, 22'"'"') arranged on the circumference of the cylinder (5) is provided, these ribs being arranged at a distance from each other and extending in the axial direction of the cylinder (5). A slide (19) seated on the outside of the cylinder (5) and guided on the guide ribs (22, 22'"'"') while at least partially encompassing them is fixed to the piston rod (8).
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Citations
14 Claims
- 1. A linear motor with a cylinder containing an axially movable piston to which a piston rod extending through at least one of the end faces of the cylinder is fitted, the section of the piston rod which is outside the cylinder being secured against torsion by being fixed to a co-moving torsion protection element movable in the axial direction of the cylinder in conjunction with a sliding guide fixed thereto, wherein the sliding guide (17) comprises at least two guide ribs (22, 22'"'"'), for example projecting substantially radially from the surface of the cylinder (5) relative to its longitudinal axis and located on the circumference of the cylinder (59), said guide ribs being arranged at a distance from each other and at least approximately extending along the entire length of the cylinder (5), and wherein the torsion protection element (18) is a slide irremovably attached to the outside of the cylinder (5) and guided flat along the guide ribs (22, 22'"'"'), said slide at least partially surrounding or encompassing the guide ribs (22, 22'"'"'), whereby, for example, the axial dimension of the slide (19) may substantially correspond to the length of the cylinder (5).
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5. A linear motor according to, 3 wherein the external surface of said cylinder is concave towards the interior of said cylinder in the area adjacent to the guide ribs (22, 22'"'"') and on both sides next to the slide.
Specification