Internal-combustion engines – Particular piston and enclosing cylinder construction – Piston
Patent
1995-12-28
1997-10-14
McMahon, Marguerite
Internal-combustion engines
Particular piston and enclosing cylinder construction
Piston
92257, F02B 1904
Patent
active
056761040
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention concerns a stepped piston able to be used for the production of motors, compressors and vacuum pumps.
BACKGROUND OF THE INVENTION
The invention more particularly concerns a production of a stepped piston which, whilst being extremely reliable, is easy to produce at a reduced cost.
It also concerns the production of a stepped piston allowing for the easy mounting of the sectioning of its first stage, as well the easy lubrication and cooling of the sectioning of its second stage.
Finally, the invention also concerns embodying on the second stage of the piston imperviousness assimilating the latter with a cylinder and enabling exhaust ports to be fitted on the latter.
SUMMARY OF THE INVENTION
According to the invention, the stepped piston is made up of three independent elements and includes a lower element which cooperates with the internal wall of the cylinder by a sealing segment, an intermediate element which cooperates with the upper face of the lower element to ensure retention of the sealing segment, and an upper element fixed to the lower element and which imperviously cooperates with the upper portion of the cylinder.
This embodiment of three independent elements enables each element to be made of a particular material adapted to its particular function. In this way, each element of the piston is smaller and easier to produce in an advance technology material (such as a ceramic material for the upper element of the stepped piston).
This disposition facilitates machining and bulk production at a reduced cost.
According to the invention, with the production of three elements, the lower element preferably has on its upper face a peripheral housing which receives the sealing segment and to which the intermediate conical element is to be secured and being fixed to the lower element by screws. Thus, easy access is available to the sealing segment in order to replace it.
According to the invention, the sectioning of the second stage is not on the piston, this being the case in traditional productions which then have the drawback of not enabling this sectioning to be cooled and lubricated, but this sectioning is placed in the cylinder, thus then being static and able to be easily lubricated and cooled.
To this effect, the sealing segment, contained in a support ring placed in a housing of the upper end of the cylinder and kept in this position by a locking screw, cooperates with the wall of the upper element of the piston which, from the point of view of imperviousness, then acts as a cylinder. It then becomes possible to fit exhaust ports on the piston.
The present embodiment is particularly adapted to a use with a guided rodding without any angular clearance. In this case, the piston is fully guided and does not touch the cylinder, only the sectionings being in contact to ensure imperviousness.
BRIEF DESCRIPTION OF THE DRAWINGS
So as to clearly understand the device of the invention, there now follows a preferred non-restrictive embodiment given by way of example with reference to the accompanying drawing whose sole FIGURE is a longitudinal sectional view of a stepped piston according to the invention and placed inside its cylinder.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
With reference to the drawing, the stepped piston of the invention is made up of three independent combined elements which include a hollow piston head 1 which constitutes the second stage of the stepped piston, as well as an intermediate conical element 2 and a segment holder 3 which when assembled constitute the first stage of the piston.
Placed in a peripheral annular housing 4 fitted in the upper face of the segment holder 3 is an annular sealing segment 5 which is kept in place by applying a conical element 2 fixed to the segment holder 3 by screws 6 traversing housings 7 of the segment holder and being engaged in threaded holes 8 of the conical element 2.
So as to fix it to the segment holder 3, the lower portion of the piston head 1 traverses a central bore 9 of the conical
REFERENCES:
patent: 2793089 (1957-05-01), Anderson
patent: 3999768 (1976-12-01), Jepson
patent: 4004499 (1977-01-01), Beck
patent: 4485779 (1984-12-01), Spurk
patent: 4522163 (1985-06-01), Hooper
patent: 4522173 (1985-06-01), Agache
patent: 4955284 (1990-09-01), Faulkner
patent: 5313875 (1994-05-01), Kadlicko
Drucker William A.
McMahon Marguerite
LandOfFree
Stepped piston for a motor, pump or compressor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Stepped piston for a motor, pump or compressor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Stepped piston for a motor, pump or compressor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1547947