Arrangement in a combustion engine with internal combustion

Details Arrangement in a combustion engine with internal combustion Arrangement in a combustion engine with internal combustion

1999-10-20

2001-09-18

Look, Edward K. (Department: 3745)

Expansible chamber devices

Piston

With separable means for pivotally mounting connecting rod...

C092S208000, C123S193600

Reexamination Certificate

active

06289791

ABSTRACT:

This invention relates to a piston and piston rod assembly.
As is known, pistons are usually mounted within a cylinder in a reciprocating manner to move back and forth to accomplish various purposes. In many cases, the piston is connected to a piston rod which, in turn, is connected to a motive source for reciprocating the piston within the cylinder. Typically, in an internal combustion engine, the piston has been connected in a hinged relationship with the piston rod in order to permit a relative movement between the piston and the piston rod, for example, where the piston rod is driven off a crank arm assembly or the like and does not move in a rectilinear path with the piston.
In cases where a piston and piston rod have been mutually connected for reciprocating movements in a rectilinear path within an associated cylinder, the connections tend to be rigid. However, a general problem which arises in these cases is that there is wear and tear not only on the outer side faces of the piston but also on the interior surfaces of the associated cylinder during use.
Accordingly, it is an object of the invention to reduce or avoid frictional resistance between the outside sliding surface of a piston and the interior sliding surface of an associated cylinder.
It is another object of the invention to reduce the tendency of wear and tear between a reciprocating piston and a cylinder during rectilinear movement of the piston.
Briefly, the invention is directed to a piston and piston rod assembly which allows restricted relative movements of a piston and a piston rod during their common rectilinear movements, for example, in a cylinder in order to allow the piston and the piston rod to be adjusted in a correct mutual support position during operation. The restricted relative movements, i.e. restricted pivotal movements, allow a self-adjustment of the piston at a head portion of the piston rod during use. This self-adjustment, in turn, provides for an automatic correct support position between the piston and the head portion along opposed, rounded off, i.e. concave cylindrical and convex cylindrical support surfaces, in order to secure an accurate concentric transfer of loads between the piston and the piston rod.
Basically, the piston is constructed with a cap portion and an annular skirt portion to define a hollow space. The piston rod includes a head member which is disposed axially within the hollow space of the piston and is provided with a convexly rounded top surface in mating engagement with a concave support surface in the piston as well as a concavely rounded bottom surface in mating engagement with a convex support surface in the piston. In addition, a clamping member is provided to secure the head member in the piston.
It is advantageous that the piston rod head member be located between a pair of opposed, separate, support members and that the support members are supported against the piston cap portion and the clamping member.
By employing a disc as a separate support member between the cap portion of the piston and head member of the piston rod, it is possible to also adjust the support member radially relative to the piston cap portion and relative to the clamping member.
It is further advantageous that the piston rod head member be provided with an annular flange portion extending radially outwards therefrom and a transition portion extending radially inwards therefrom and that the top convex surface be incorporated in the transition portion and that the bottom concave surface be incorporated in the underside of the flange portion.
Loads transferred from piston to piston rod, and vice versa, are substantially transferred centrally of the piston and the piston rod. However, eccentric loads acting on the piston rod flange portion will automatically cause an adjustment of the piston and piston rod into correct concentric positions.


REFERENCES:
patent: 5601010 (1997-02-01), Sawada et al.

Affiliated with

Also associated with

Rating

Arrangement in a combustion engine with internal combustion does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Arrangement in a combustion engine with internal combustion, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Arrangement in a combustion engine with internal combustion will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2470804