Internal combustion engine with compensation weight arranged on the crankshaft and serving as an imbalance, and method for production of the crankshaft

Patent metadata

Field	Value
Publication number	US-9285012-B2
Application number	US-201414255504-A
Country	US
Kind code	B2
Filing date	Apr 17, 2014
Priority date	Apr 17, 2013
Publication date	Mar 15, 2016
Grant date	Mar 15, 2016

Abstract

The invention concerns an internal combustion engine and a method of producing the engine in which the engine has at least one cylinder and with a crank drive comprising a crankshaft, in which the crankshaft mounted in the crankcase has an associated crankshaft throw, the crankshaft throws being arranged spaced apart along the longitudinal axis of the crankshaft, and at least one compensation weight serving as imbalance is arranged on the crankshaft on the side opposite at least one crankshaft throw. The compensation weight has an arcuate form on the outward-facing side, the outside of which running in the peripheral direction has a constant distance S from a reference axis which runs parallel to and spaced by a distance Δ from the longitudinal axis of the crankshaft, wherein the reference axis is arranged on the side facing away from the compensation weight, starting from the longitudinal axis of the crankshaft.

First claim

The invention claimed is:

1. An internal combustion engine with at least one cylinder and with a crank drive comprising a crankshaft, in which
the crankshaft mounted in the crankcase has an associated crankshaft throw for each cylinder, wherein the crankshaft throws are arranged spaced apart along the longitudinal axis of the crankshaft, and
at least one compensation weight extending from a periphery of one or more of the crankshaft throws and being arranged on the crankshaft, for the purpose of a mass compensation,
wherein
the at least one compensation weight has an arcuate form on the outward-facing side, the outside of which running in the peripheral direction has a constant distance S from a reference axis which runs parallel to and spaced by a distance A from the longitudinal axis of the crankshaft, wherein the reference axis is arranged on the side facing away from the compensation weight, starting from the longitudinal axis of the crankshaft.

2. The internal combustion engine as claimed in claim 1 , further including a piston for each cylinder, and wherein each piston belonging to a cylinder is connected pivotably to the crankshaft via a connecting rod, wherein the connecting rod at one end is connected pivotably to the piston via a piston pin and at another end is mounted rotatably on a crank journal of the associated crankshaft throw of the crankshaft.

3. The internal combustion engine as claimed in claim 2 , wherein the longitudinal axis of each piston intersects the longitudinal axis of the crankshaft.

4. The internal combustion engine as claimed in claim 3 , wherein when the piston is at bottom dead center, the plane spanned by the two longitudinal axes forms the center plane of the at least one compensation weight.

5. The internal combustion engine as claimed in claim 3 , wherein the reference axis lies in the plane spanned by the longitudinal axis of the at least one piston and the longitudinal axis of the crankshaft.

6. The internal combustion engine as claimed in claim 2 , wherein the longitudinal axis of the crankshaft runs spaced from the longitudinal axis of the at least one piston.

7. The internal combustion engine as claimed in claim 6 , wherein when the piston is at bottom dead center, a plane running through the longitudinal axis of the crankshaft and parallel to the longitudinal axis of the at least one piston forms the center plane of the at least one compensation weight.

8. The internal combustion engine as claimed in claim 6 , wherein the reference axis lies in the plane which runs through the longitudinal axis of the crankshaft and parallel to the longitudinal axis of the at least one piston.

9. The internal combustion engine as claimed in claim 1 , wherein the reference axis lies between the longitudinal axis of the crankshaft and the at least one crankshaft throw.

10. The internal combustion engine as claimed in claim 1 , wherein for distance Δ: 0<Δ≦150 mm.

11. The internal combustion engine as claimed in claim 1 , wherein for distance Δ: 0<Δ≦50 mm.

12. The internal combustion engine as claimed in claim 1 , wherein for distance Δ: 50≦Δ≦100 mm.

13. The internal combustion engine as claimed in claim 1 , wherein for distance Δ: 100≦Δ≦150 mm.

14. The internal combustion engine as claimed in claim 1 , wherein for distance Δ: 3≦Δ≦15 mm.

15. The internal combustion engine as claimed in claim 1 , wherein for distance Δ: 5≦Δ≦12 mm.

16. A method for production of the crankshaft of an internal combustion engine as claimed in any of the preceding claims, wherein the crankshaft is forged together with the at least one compensation weight arranged on the crankshaft.

17. An internal combustion engine with cylinders and with a crank drive comprising a crankshaft having an axis, the engine comprising:
a crankcase in which the crankshaft is mounted, said crankcase having a crankshaft throw for each cylinder, said throws being arranged spaced apart along the crankshaft axis; and
a compensation weight extending from a periphery of one or more of said crankshaft throws and being arranged on the crankshaft, said weight having an outward-facing side that has an arcuate form, said outward-facing side runs in the peripheral direction and has a constant distance from a reference axis that is parallel to the crankshaft axis and spaced by a distance Δ.

18. The internal combustion engine of claim 17 wherein said constant distance is distance S, and wherein the reference axis is arranged on the side facing away from the compensation weight, starting from the crankshaft axis.

19. The internal combustion engine of claim 17 further including a piston in each cylinder and wherein each piston is connected pivotably to the crankshaft via a connecting rod, wherein the connecting rod at one end is connected pivotably to the piston via a piston pin and at another end is mounted rotatably on a crank journal of the associated crankshaft throw of the crankshaft.

20. The internal combustion engine of claim 19 wherein each said piston has a longitudinal axis, and wherein said longitudinal axis of each piston intersects the crankshaft axis and wherein said piston can be moved to bottom dead center, wherein when said piston is at bottom dead center, the plane spanned by the two axes forms the center plane of said compensation weight.

Assignees

• Ford Global Tech Llc

Inventors

• Lach Rainer
• Bonse Joerg

Classifications

• F16F15/283 Primary

  for engine crankshafts · CPC title

• F16F15/322 Primary

  the rotating body being a shaft (F16F15/34, F16F15/36 take precedence) · CPC title