Expansible chamber devices – Fluid conduit or port in fixed wall of working chamber – Port in separable chamber end closure
Patent
1996-12-13
1998-09-15
Denion, Thomas E.
Expansible chamber devices
Fluid conduit or port in fixed wall of working chamber
Port in separable chamber end closure
92128, 92165R, 92168, F01B 3100
Patent
active
058064060
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a hydraulic cylinder, comprising a cylindric tube with two end covers, of which one end cover is provided with an opening for a piston rod connected to a piston which is displaceable between the end covers, wherein the end covers on one hand are connected to the tube via a screw joint, on the other are provided with channels for inlet and outlet of a hydraulic medium, to and from the respective spaces between the piston and the end covers.
BACKGROUND OF THE INVENTION
Hydraulic cylinders according to the above are used as components in many different machines and vehicles, in order to create and control movements.
The cylinders are rather simple to make in serial production in different special variants with reference to diameter and stroke, according to customer's needs. Thereby, a series produced machine or a vehicle may be optimized with reference to the intended area of use.
At later stages, during the service life of the machine or the vehicle, a hydraulic cylinder may be damaged so that it has to be replaced. Then it is often impossible to obtain a hydraulic cylinder as a stock item, but it has to be specially made comparatively expensive. The manufacturing will be expensive, because a number of welds usually must be made when assembling the two end covers of the cylinder tube, when assembling the cylinder tube connectors for hydraulic lines and when mounting the brackets of the piston rod and the tube. This welding also give rise to known disadvantages, e.g. changes in the material and thermal tensions.
Certainly, there are hydraulic cylinders, which are assembled by means of tension rods. However, those hydraulic cylinders will require more space for installation, which often prevents them from replacing conventional welded hydraulic cylinders. Also, they are more heavy.
One object of the present invention is therefore to provide a hydraulic cylinder which may replace welded cylinders and may be specially made in a more simple manner than those cylinders.
SUMMARY OF THE INVENTION
For this purpose, the apparatus according to the invention is characterized in that each end cover comprises an outer member and an insert member, and that the channels for the hydraulic medium extend through the outer member and the insert member. By this design of the end covers, the work is reduced when assembling special cylinders, substantially when adapting the cylinder tube and the piston rod to the correct stroke.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described here below with reference to an embodiment shown in the accompanying drawings, in which
FIG. 1 shows a longitudinal section through a hydraulic cylinder according to the invention,
FIG. 2 in a somewhat reduced scale shows one of the end covers with its piston rod and piston,
FIG. 3 shows the cylinder tube correspondingly, and
FIG. 4 shows the other end cover.
DETAILED DESCRIPTION OF THE INVENTION
The hydraulic cylinder shown in the figures comprises a cylindrical tube 10 with end covers 11, 12. One of the end covers 11 is provided with an opening for a piston rod 13 which is connected to a piston 14 which is displaceable between the end covers. As shown in FIGS. 1 and 2, the opening for the piston rod 13 in the end cover 11 may have a diameter which is larger than the diameter of the piston rod.
The end covers 11, 12 are connected to the tube 10 via screw joints, comprising one at each of the outer members (19, 20) is provided (16) with a section of (15) at each end of the tube (10) each tube end is provided with an external screw thread 15, which is adapted for cooperation with an internal screw thread 16 at each of the end covers 11, 12.
Each end cover is provided with connectors 17 and internal channels 18 for inlet and outlet of a hydraulic medium, to and from the respective spaces between the piston 14 and the end covers.
Each end cover 11, 12 comprises an outer member 19, 20 and an insert member 21, 22. As shown most clearly in FIG. 1, the insert members 21, 22 are disposed
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patent: 4671169 (1987-06-01), Hillier
patent: 5471909 (1995-12-01), Kobelt
AB Multidock Hydraulic
Denion Thomas E.
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