Multi-Part Piston for an Internal Combustion Engine

• US 20090007880A1
• Filed: 12/20/2006
• Published: 01/08/2009
• Est. Priority Date: 12/23/2005
• Status: Active Grant

• Current Assignee: Mahle International GmbH (MAHLE-STIFTUNG GmbH)
• Original Assignee: Mahle International GmbH (MAHLE-STIFTUNG GmbH)
• Inventors: Messmer, Dieter
• Granted Patent: US 7,628,135 B2
• Time in Patent Office: Days
• US Class Current: 123/193.600
• CPC Class Codes: F02F 3/0023 the parts being bolted or screwed together

Abstract

A multipart piston for an internal combustion engine has a top piston part and a bottom piston part. The top piston part is provided with an externally threaded head at the end facing the bottom piston part while the bottom piston part is equipped with a support plate at the end facing the top piston part. The support plate encompasses a plate member and an internally threaded element into which the threaded head is screwed. The plate member is joined to the bottom piston part via a connection zone in such a way that the bottom end of the threaded element lies below the bottom end of the connection zone relative to the longitudinal axis of the piston.

Claims

1. Multi-part piston (10) for an internal combustion engine, having an upper piston part (11) and a lower piston part (12), whereby the upper piston part (11) has a threaded head (31) provided with an outside thread on its side facing the lower piston part (12), and the lower piston part (12) has a support plate (33) with a plate body (36) and a threaded body (34) provided with an inside thread on its side facing the upper piston part (11), into which the threaded head (31) is screwed, wherein the plate body (36) is connected with the lower piston part (12) by way of a connection region (37), in such a manner that the lower end (38) of the threaded body (34) lies lower, with reference to the longitudinal piston axis (A), than the lower end (39) of the connection region (37).

2. Piston according to claim 1, wherein the threaded body (34) lies lower, with reference to the longitudinal piston axis (A), than the connection region (37).

3. Piston according to claim 1, wherein the threaded body (34) has a threaded through-bore (35) provided with the inside thread.

4. Piston according to claim 1, wherein the threaded body (34) has a dead-end bore provided with the inside thread.

5. Piston according to claim 1, wherein the lower piston part (12) has an inner, circumferential support element (25), and that the support plate (33) is connected with the inner support element (25).

6. Piston according to claim 1, wherein the upper piston part (11) and the lower piston part (12) have inner circumferential support elements (21;

25) with inner contact surfaces (23;

27), and outer circumferential support elements (22;

26) with outer contact surfaces (24;

28), and in the assembled state, the inner contact surfaces (23;

27) and the outer contact surfaces (24;

28) lie against one another, in each instance.