Two-part piston for an internal combustion engine
First Claim
1. :
- Two-part piston (1, 1″
) for an internal combustion engine,having an upper part (2, 2″
) that forms a piston crown (4, 4′
),whereby a cylindrical pin (31) having an outside thread (32) and lying coaxial to the piston axis (12) is formed onto the underside of the upper part (2, 2″
), on the side facing away from the piston crown (4, 4″
), andhaving a lower part (3, 3″
), on the underside of which pin bosses (9, 9′
) having pin bores (10, 10′
) and skirt elements (13) that connected the pin bosses (9, 9′
) with one another are disposed,whereby the lower part (3, 3′
, 3″
) has an upper crown part (25, 25′
) with an opening (27, 27′
) that lies coaxial to the piston axis (12), into which opening the pin (31) is introduced, by way of which pin the upper part (2, 2″
) is screwed to the lower part (3, 3″
) by means of a hexagonal nut (29) screwed onto the pin (31),whereinthe radial inside of the opening (27) has a ring-shaped surface (21) disposed on the skirt side, which lies further removed from the piston crown (4) than the upper face surface (23) of the hexagonal nut (29), andthat an expansion sleeve (26) is disposed between the face surface (23) and the surface (21), which sleeve, for one thing, has a collar (28) directed radially inward, disposed on its side facing the piston crown, this collar having a radially oriented inside surface (20) on its side facing away from the piston crown, against which surface the face surface (23) of the hexagonal nut (29) rests, and, for another thing, has a contact surface (19) that faces the piston crown in its region that faces away from the piston crown, which surface rests against the surface (21).
1 Assignment
0 Petitions
Accused Products
Abstract
A two-piece piston for an internal combustion engine has an upper piece and a lower piece, the lower piece having an upper base part with an opening lying coaxial to the piston axis into which a pin on the upper piece is inserted. The upper piece is connected to the lower piece with a hexagonal nut screwed onto the pin. A resilient sleeve is arranged between the upper piece and the lower piece comprising an inwardly directed collar on the against which the upper face of the hexagonal nut lies and in the region facing away from the piston crown, a contact surface facing the piston crown lying on a surface on the inner side of the opening. An economically produced two-piece piston results with a resilient sleeve between both screwed piston pieces which exerts a pre-tensioning and thus provides security for the screw connection.
17 Citations
9 Claims
-
1. :
- Two-part piston (1, 1″
) for an internal combustion engine,having an upper part (2, 2″
) that forms a piston crown (4, 4′
),whereby a cylindrical pin (31) having an outside thread (32) and lying coaxial to the piston axis (12) is formed onto the underside of the upper part (2, 2″
), on the side facing away from the piston crown (4, 4″
), andhaving a lower part (3, 3″
), on the underside of which pin bosses (9, 9′
) having pin bores (10, 10′
) and skirt elements (13) that connected the pin bosses (9, 9′
) with one another are disposed,whereby the lower part (3, 3′
, 3″
) has an upper crown part (25, 25′
) with an opening (27, 27′
) that lies coaxial to the piston axis (12), into which opening the pin (31) is introduced, by way of which pin the upper part (2, 2″
) is screwed to the lower part (3, 3″
) by means of a hexagonal nut (29) screwed onto the pin (31),wherein the radial inside of the opening (27) has a ring-shaped surface (21) disposed on the skirt side, which lies further removed from the piston crown (4) than the upper face surface (23) of the hexagonal nut (29), and that an expansion sleeve (26) is disposed between the face surface (23) and the surface (21), which sleeve, for one thing, has a collar (28) directed radially inward, disposed on its side facing the piston crown, this collar having a radially oriented inside surface (20) on its side facing away from the piston crown, against which surface the face surface (23) of the hexagonal nut (29) rests, and, for another thing, has a contact surface (19) that faces the piston crown in its region that faces away from the piston crown, which surface rests against the surface (21). - View Dependent Claims (2, 3, 4, 5, 6, 7)
- Two-part piston (1, 1″
-
8. :
- Two-part piston (1′
) for an internal combustion engine,having an upper part (2′
) that forms a piston crown (4″
),whereby a dead-end hole bore (49) with inside thread, which lies coaxial to the piston axis (12), is disposed on the underside of the upper part (2′
) facing away from the piston crown (4″
), andhaving a lower part (3′
), on the underside of which pin bosses (9″
, 9′
″
) with pin bores (10″
, 10′
″
) and skirt elements (13′
) that connect the pin bosses (9″
, 9′
″
) with one another are disposed,whereby the lower part (3′
) has an upper crown part (25″
) having an opening (27″
) that lies coaxial to the piston axis (12), by way of which the upper part (2′
) is connected with the lower part (3′
) by means of a hexagonal screw (39)wherein the radial inside of the opening (27″
) has a ring-shaped surface (21″
) disposed on the skirt side,that the head (40) of the hexagonal screw (39) has a contact surface (51) radially on the outside, on the piston crown side, that a tube-shaped intermediate piece (41) with an upper face surface (50) is disposed on the contact surface (51), whereby the face surface (50) lies closer to the piston crown (4″
) than the surface (21″
), andthat an expansion sleeve (26) are disposed between the face surface (50) of the intermediate piece (41) and the surface (21″
), which sleeve, for one thing, has a collar (28′
) directed radially inward on its side facing the piston crown, this collar having a radially oriented inside surface (20) disposed on its side facing away from the piston crown, which surface rests on the face surface (50), and, for another thing, has a contact surface (19) that faces the piston crown in its region that faces away from the piston crown, which surface rests against the surface (21″
). - View Dependent Claims (9)
- Two-part piston (1′
Specification