Machine element or mechanism – Elements – Eccentric
Patent
1985-10-29
1987-06-02
Footland, Lenard A.
Machine element or mechanism
Elements
Eccentric
G05G 100
Patent
active
046693319
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an eccentric ring and eccentric where the eccentric ring has polygon-shaped cross section and plane side faces.
In connection with piston pumps and piston engines crank and piston rod are used for converting rotary motion into a rectilinear reciprocating motion.
Eccentric and eccentric rod are likewise used for this purpose.
The fundamental difference between crank and eccentric is functionally slight.
The characteristic feature of both is that a circular cylindrical eccentrically rotating bearing journal surface exerts rotary pressure and pulling forces on an encircling ring which is also circular cylindrical.
The known piston or eccentric rod is fixedly secured to this ring whereby the rotary motion is converted into a rectilinear reciprocating motion.
Lubrication of the sliding faces is provided in many known manners by immersion in lubricant, pressure lubrication and the like.
The eccentric ring according to the invention is characteristic in that channels for lubricant extend from the plane side faces of the eccentric ring into the middle of the bearing surface of the eccentric ring a system of helical grooves being provided in said bearing surface. The lubrication system is thereby integrated as an integral part of its structure and function.
The side faces of the polygon are plane and form an abutment for the pistons in the cylinders arranged on the pump housing at right angles to the side faces.
The pistons being in the nature of plungers have also a plane pressure face facing the polygon face.
From each polygon face in the middle of the area where the piston is abutting there is provided a lubrication channel extending into the middle of the bearing where the eccentric journal is rotating.
The helical grooves provided in the cylindrical bearing surface of the eccentric ring are of such direction, pitch, depth and number that lubricant from the chamber wherein the entire device is situated, under the influence of the adhesive power to the rotating bearing journal, is accelerated to describe a movement from the edges of the bearing in a direction towards its centre line.
By this pump-like movement there is created a hydraulic pressure between bearing surface and bearing journal in an area concentrically along the centre line of the bearing.
By this pressure lubricant can be pressed out through the above-mentioned oil channels to the polygon faces.
The counter-pressures existing between the polygon faces and the contact faces of the pistons are highly varying due to the movement of the pistons. When a piston is pressed away from the centre, the pressure is high because in such movement it will perform a working stroke. In its back stroke, however, the piston will exert lower surface pressure and thus lower counter-pressure with regard to the hydraulic pressure of the lubricant.
In a preferred embodiment of the invention there is concentrically in the bearing journal of the eccentric provided a groove which spans approx. 180.degree.. Thus by the rotation of the bearing journal in bearing of the eccentric ring the groove will act as a rotating valve in respect of the lubricant, said valve successively opening and shutting off the lubrication channels thereby obtaining an effect similar to that of a lubrication pump with valves but in a very simple manner.
It is thus avoided that this lower counter-pressure will result in too low hydraulic pressure in the centre of the eccentric bearing in that the groove will act as a reservoir but only over part of the circumference of the journal. This groove has such a size and is so positioned on the bearing journal that it passes under the lubrication channels leading to the bearing of the eccentric ring. The length of the groove in the bearing surface at right angles to the axis thereof has moreover been chosen so that its front end in motion will open the lubrication channel under the piston having started its outward movement and its rear end in a similar manner shut off the lubrication channel to the polygon face under the pist
REFERENCES:
patent: 2054549 (1936-09-01), Alden
patent: 2471187 (1949-05-01), Atwater
patent: 4120544 (1978-10-01), Huber
patent: 4199995 (1980-04-01), Murakami
Andersen Niels
Rasmussen Hans M.
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