Piston and cylinder unit
First Claim
1. In a piston and cylinder unit having a cylinder body comprising a tube with end caps;
- a piston mounted for controlled axial displacement in the tube;
a piston rod extending along part of the tube with a portion of the piston rod mounted to extend through one end cap externally of the body in sealing engagement with the one end cap for axial movement relative thereto with an external end of the portion free for coupling to a power take-off;
a rack having a toothed portion extending along the portion of the piston rod from a location external of the body through the one end cap into said tube part; and
, a pinion gear in operative engagement with the toothed portion of the rack throughout the working stroke of the piston rod, piston rod movement control means connected with the pinion gear means to connect a supply of pressure fluid to said part of the tube, the pinion gear being mounted inside the cylinder body with the pinion gear in operative engagement with a toothed portion of the rack inside the cylinder body.
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Accused Products
Abstract
The invention relates to a piston and cylinder unit whose piston rod is provided with a rack extending along it. The rack is in mesh with a ring of teeth (such as the teeth of a toothed belt or the teeth of a gear wheel) adapted to revolve about one axis (in the case of a gear wheel) or about at least two axes (in the case of a toothed belt). Such meshing engagement takes place in every position of the piston rod. When the piston rod is moved in the direction of its length the ring of teeth revolves about at least one axis and rotates a means for influencing the motion of the piston rod. Such means may for example be a liquid brake or a synchro transmitter connected with a NC unit controlling the supply of driving fluid to the piston and cylinder unit.
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Citations
24 Claims
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1. In a piston and cylinder unit having a cylinder body comprising a tube with end caps;
- a piston mounted for controlled axial displacement in the tube;
a piston rod extending along part of the tube with a portion of the piston rod mounted to extend through one end cap externally of the body in sealing engagement with the one end cap for axial movement relative thereto with an external end of the portion free for coupling to a power take-off;
a rack having a toothed portion extending along the portion of the piston rod from a location external of the body through the one end cap into said tube part; and
, a pinion gear in operative engagement with the toothed portion of the rack throughout the working stroke of the piston rod, piston rod movement control means connected with the pinion gear means to connect a supply of pressure fluid to said part of the tube, the pinion gear being mounted inside the cylinder body with the pinion gear in operative engagement with a toothed portion of the rack inside the cylinder body. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
- a piston mounted for controlled axial displacement in the tube;
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23. A piston and cylinder unit having a cylinder body comprising a tube with end caps;
- a piston rod mounted for controlled axial displacement in the tube;
the piston rod extending longitudinally of the tube with a portion of the piston mounted to extend through one end cap externally of the body for axial movement relative thereto with an external end of the portion free for coupling to a power take-off;
a rack extending along one side of the portion of the piston rod through the one end cap;
a chamber formed in the one end cap and having an opening adjacent the piston rod;
a pinion gear rotatably mounted in the chamber with a pinion wheel extending through the opening into operative engagement with the rack;
a device connected to the pinion gear for controlling the piston rod movement;
a channel section guide surface provided in the one end cap and receiving the portion of the piston rod as a sliding fit with the rack located adjacent the channel mouth, the pinion wheel being elastomeric and cooperating with wall surfaces of the chamber to provide a labyrinth seal on the one side of the piston rod by engagement with the rack; and
, a sealing annulus of complementary cross-section to the piston portion, which annulus is mounted in the one cylinder end cap between the chamber and the exterior with the said portion of the piston passing through the sealing annulus which forms a sliding, sealing fit with all sides thereof.
- a piston rod mounted for controlled axial displacement in the tube;
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24. A piston and cylinder unit having a cylinder body comprising a tube with end caps;
- a piston rod mounted for controlled axial displacement in the tube;
the piston rod extending longitudinally of the tube with a portion of the piston mounted to extend through one end cap externally of the body for axial movement relative thereto with an external end of the portion free for coupling to a power take-off;
a rack extending along one side of the portion of the piston rod through the one end cap;
means to connect a supply of pressure fluid to a part of the tube;
a chamber formed in the one end cap and having an opening adjacent the piston rod;
a pinion gear rotatably mounted in the chamber with a pinion wheel extending through the opening into operative engagement with the rack;
a device connected to the pinion gear for controlling the piston rod movement;
a guide channel provided in the one end cap extending between the chamber opening and said part of the tube and receiving the portion of the piston rod as a sliding fit with the rack located adjacent the channel mouth.
- a piston rod mounted for controlled axial displacement in the tube;
Specification