CRANKSHAFTS AND METHODS OF BALANCING THE SAME

• US 20190309792A1
• Filed: 04/09/2018
• Published: 10/10/2019
• Est. Priority Date: 04/09/2018
• Status: Abandoned Application

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations LLC (General Motors Company)
• Inventors: Courtial, Alessio, Sperlinga, Giuliano
• Application Number:
  US15/948,041
• Publication Number:
  US 20190309792A1
• Time in Patent Office: Days
• CPC Class Codes: F16C 11/02 Trunnions; Crank-pins fastening crank-pins to webs, crank-pins integral with cranks F16C3/06, F16C3/22
• CPC Class Codes: F16C 19/507 with rolling elements journaled in one of the moving parts, e.g. stationary rollers to support a rotating part
• CPC Class Codes: F16C 2233/00 Monitoring condition, e.g. temperature, load, vibration
• CPC Class Codes: F16C 2240/30 Angles, e.g. inclinations
• CPC Class Codes: F16C 2360/22 Internal combustion engines in general F02B
• CPC Class Codes: F16C 3/20 Shape of crankshafts or eccentric-shafts having regard to balancing
• CPC Class Codes: F16F 15/26 of crankshaft systems using solid masses, other than the ordinary pistons, moving with the system , i.e. masses connected through a kinematic mechanism or gear system F16F15/226 takes precedence
• CPC Class Codes: F16F 15/283 for engine crankshafts
• CPC Class Codes: F16F 15/322 the rotating body being a shaft F16F15/34, F16F15/36 take precedence

Abstract

Provided herein are crankshafts comprising a first and second bearing journal both aligned along a crankshaft rotation axis, a first counterweight throw, a web throw including a first web and a second web coupled via a second crankpin, wherein the first web is coupled to the first counterweight throw via the first bearing journal, and a second counterweight throw coupled to the second web via the second bearing journal. The first web and second web each have a center of gravity (COG) offset from a plane defined by the crankshaft rotation axis and a longitudinal axis of the second crankpin. The COGs of each web can be on opposite sides of a plane defined by the crankshaft rotation axis and a longitudinal axis of the second crankpin. The COGs of each web can be substantially symmetrical relative to the plane.

Claims

1. A crankshaft, comprising:

a first bearing journal and a second bearing journal, both aligned along a crankshaft rotation axis;

a first counterweight throw including a first throw arm coupled to a second throw arm via a first crankpin,

a web throw including a first web and a second web coupled via a second crankpin, wherein the first web is coupled to the second throw arm of the first counterweight throw via the first bearing journal; and

a second counterweight throw including a first throw arm connected to a second throw arm via a third crankpin, wherein the first throw arm is connected to the second web via the second bearing journal,

wherein the first web and second web each have a center of gravity (COG) on opposite sides of a plane defined by the crankshaft rotation axis and a longitudinal axis of the second crankpin.

2. The crankshaft of claim 1, wherein the COG of the first web and the second web each occur within the radial cross-sectional area of the second crankpin.

3. The crankshaft of claim 1, wherein the COG of the first web and the second web each occur outside of the radial cross-sectional area of the second crankpin.

4. The crankshaft of claim 1, wherein the first web and/or the second web comprise one or more COG-offsetting holes.

5. The crankshaft of claim 1, wherein the COGs of the first web and second web are substantially symmetrical relative to the plane defined by the crankshaft rotation axis and a longitudinal axis of the second crankpin.

6. The crankshaft of claim 1, wherein each of the first, second, and third crankpins comprise a generally cylindrical body with a longitudinal axis offset from, but parallel to, the crankshaft rotation axis.

7. The crankshaft of claim 1, wherein one or more of the first web and second web each comprises two asymmetric, COG-offsetting corners on opposite sides of the plane defined by the crankshaft rotation axis and a longitudinal axis of the second crankpin.

8. The crankshaft of claim 1, wherein the two asymmetric, COG-offsetting corners of the first web form a contour which is asymmetrically mirrored by a contour formed by the two asymmetric, COG-offsetting corners of the second web, relative to the plane defined by the crankshaft rotation axis and a longitudinal axis of the second crankpin.

9. The crankshaft of claim 1, wherein the crankshaft rotation axis, the plane defined by the crankshaft rotation axis and a longitudinal axis of the second crankpin, and each of the COG of the first web and the COG of the second web define a COG offset angle of about 5 degrees to about 15 degrees for each of the first web and the second web, respectively.

10. A crankshaft, comprising:

a first bearing journal and a second bearing journal, both aligned along a crankshaft rotation axis;

a first counterweight throw;

a web throw including a first web and a second web coupled via a crankpin, wherein the first web is coupled to the first counterweight throw via the first bearing journal; and

a second counterweight throw coupled to the second web via the second bearing journal,

wherein the first web and second web each have a center of gravity (COG) offset from a plane defined by the crankshaft rotation axis and a longitudinal axis of the crankpin.

11. The crankshaft of claim 10, wherein the COG of the first web and the second web each occur within the radial cross-sectional area of the crankpin.

12. The crankshaft of claim 10, wherein the COG of the first web and the second web each occur outside of the radial cross-sectional area of the crankpin.

13. The crankshaft of claim 10, wherein the first web and/or the second web comprise one or more COG-offsetting holes.

14. The crankshaft of claim 10, wherein the COGs of the first web and second web are on opposite sides of a plane defined by the crankshaft rotation axis and a longitudinal axis of the crankpin.

15. The crankshaft of claim 14, wherein the COGs of the first web and second web are substantially symmetrical relative to the plane defined by the crankshaft rotation axis and a longitudinal axis of the crankpin.

16. The crankshaft of claim 10, wherein the crankpin comprises a generally cylindrical body with a longitudinal axis offset from, but parallel to, the crankshaft rotation axis.

17. The crankshaft of claim 10, wherein one or more of the first web and second web each comprises two asymmetric, COG-offsetting corners on opposite sides of the plane defined by the crankshaft rotation axis and a longitudinal axis of the crankpin.

18. The crankshaft of claim 10, wherein the two asymmetric, COG-offsetting corners of the first web form a contour which is asymmetrically mirrored by a contour formed by the two asymmetric, COG-offsetting corners of the second web, relative to the plane defined by the crankshaft rotation axis and a longitudinal axis of the crankpin.

19. The crankshaft of claim 10, wherein the crankshaft rotation axis, the plane defined by the crankshaft rotation axis and a longitudinal axis of the crankpin, and each of the COG of the first web and the COG of the second web define a COG offset angle of about 5 degrees to about 15 degrees for each of the first web and the second web, respectively.