Crankshaft

Patent metadata

Field	Value
Publication number	US-9273604-B2
Application number	US-201313763387-A
Country	US
Kind code	B2
Filing date	Feb 8, 2013
Priority date	Feb 8, 2013
Publication date	Mar 1, 2016
Grant date	Mar 1, 2016

Abstract

A crankshaft having a front end, a rear end, and a central axis extending from the front end to the rear end is provided. The crankshaft includes a front crankpin, a rear crankpin, and one or more central crankpins. The front crankpin is located in proximity to the front end and the rear crankpin is located in proximity to the rear end. Further, the one or more central crankpins are located substantially equidistant from the front crank pin and the rear crankpin. The crankshaft further includes pairs of counterweights disposed on each side of the front crankpin, the rear crankpin and the one or more central crankpin. The counterweights are disposed such that counterweights in each pair of counterweights are angularly offset with respect to each other.

First claim

What is claimed is:

1. A crankshaft having a front end, a rear end, and a central axis extending from the front end to the rear end, the crankshaft comprising:
at least one front crankpin located in proximity to the front end;
at least one rear crankpin located in proximity to the rear end;
one or more central crankpins located substantially equidistant from the front crankpin and the rear crankpin; and
pairs of counterweights disposed on each side of the front crankpin, the rear crankpin and the one or more central crankpins such that counterweights in each pair of counterweights are angularly offset with respect to each other, the pairs of counterweights including a first pair of counterweights disposed on each side of the front crankpin, the first pair of counterweights being arranged such that a first counterweight of the first pair of counterweights is substantially aligned with a horizontal plane perpendicular to the central axis and a second counterweight of the first pair of counterweights is arranged at an angle of 60 degrees from the first counterweight of the first pair of counterweights.

2. The crankshaft of claim 1 , wherein the one or more central crankpins include a first central crankpin and a second central crankpin.

3. The crankshaft of claim 2 , wherein the pairs of counterweights further include a second pair of counterweights disposed on each side of the first central crankpin, the second pair of counterweights is arranged such that a first counterweight of the second pair of counterweights is arranged at an angle of 180 degrees and the second counterweight of the second pair of counterweights is arranged at an angle of 240 degrees from a first counterweight of a first pair of counterweights respectively.

4. The crankshaft of claim 3 , wherein the pairs of counterweights further include a third pair of counterweights disposed on each side of the second central crankpin, the third pair of counterweights is arranged such that a first counterweight of the third pair of counterweights is arranged at an angle of 240 degrees and the second counterweight of the third pair of counterweights is arranged at an angle of 180 degrees from a first counterweight of a first pair of counterweights respectively.

5. The crankshaft of claim 4 , wherein the pairs of counterweights further include a fourth pair of counterweights disposed on each side of the rear crankpin, the fourth pair of counterweights is arranged such that a first counterweight of the fourth pair of counterweights is arranged at an angle of 60 degrees from a first counterweight of a first pair of counterweights and the second counterweight of the fourth pair of counterweights is substantially aligned with a horizontal plane perpendicular to the central axis.

6. The crankshaft of claim 5 , wherein the crankshaft further includes pairs of cheeks coupled to the front crankpin, the rear crankpin, and the central crankpins.

7. The crankshaft of claim 6 , wherein the first, second, third and fourth pair of counterweights are secured to the plurality of cheeks coupled to the front crankpin, the rear crankpin, and the central crankpins respectively, by using bolts.

8. A multiple cylinders internal combustion engine comprising:
a cylinder block having two banks of cylinders disposed at a predetermined angle with respect to each other;
a crankshaft disposed rotatably within the cylinder block and having a front end, a rear end, and a central axis extending from the front end to the rear end, the crankshaft comprising:
at least one front crankpin located in proximity to the front end;
at least one rear crankpin located in proximity to the rear end;
one or more central crankpins located substantially equidistant from the front crankpin and the rear crankpin; and
pairs of counterweights disposed on each side of the front crankpin, the rear crankpin and the one or more central crankpin such that counterweights in each pair of counterweights are angularly offset with respect to each other, the pairs of counterweights including a first pair of counterweights disposed on each side of the front crankpin, the first pair of counterweights being arranged such that a first counterweight of the first pair of counterweights is substantially aligned with a horizontal plane perpendicular to the central axis and a second counterweight of the first pair of counterweights is arranged at an angle of 60 degrees from the first counterweight of the first pair of counterweights.

9. The multiple cylinders internal combustion engine of claim 8 further comprising a plurality of pistons reciprocally mounted on corresponding plurality of cylinders on the two banks of cylinders.

10. The multiple cylinders internal combustion engine of claim 8 , wherein the one or more central crankpins include a first central crankpin and a second central crankpin.

11. The multiple cylinders internal combustion engine of claim 10 , wherein the pairs of counterweights further include a second pair of counterweights disposed on each side of a first central crankpin, the second pair of counterweights is arranged such that a first counterweight of the second pair of counterweights is arranged at an angle of 180 degrees and the second counterweight of the second pair of counterweights is arranged at an angle of 240 degrees from a first counterweight of a first pair of counterweights respectively.

12. The multiple cylinders internal combustion engine of claim 11 , wherein the pairs of counterweights further include a third pair of counterweights disposed on each side of a second central crankpin, the third pair of counterweights is arranged such that a first counterweight of the third pair of counterweights is arranged at an angle of 240 degrees and the second counterweight of the third pair of counterweights is arranged at an angle of 180 degrees from a first counterweight of a first pair of counterweights respectively.

13. The multiple cylinders internal combustion engine of claim 12 , wherein the pairs of counterweights further include a fourth pair of counterweights disposed on each side of the rear crankpin, the fourth pair of counterweights is arranged such that a first counterweight of the fourth pair of counterweights is arranged at an angle of 60 degrees from a first counterweight of a first pair of counterweights and the second counterweight of the fourth pair of counterweights is substantially aligned with a horizontal plane perpendicular to the central axis.

14. The multiple cylinders internal combustion engine of claim 13 , wherein the first, second, third and fourth pair of counterweights are secured to pairs of cheeks coupled to the front crankpin, the rear crankpin, and the central crankpins respectively, by using bolts.

15. A crankshaft having a front end, a rear end, and a central axis extending from the front end to the rear end, the crankshaft comprising:
a pair of outer crankpins defined by a first crankpin and a sixth crankpin;
a pair of inner crankpins defined by a second crankpin and a fifth crankpin;
a pair of central crankpins defined by a third crankpin and a fourth crankpin;
a first pair of counterweights disposed on each side of the first crankpin, the first pair of counterweights is arranged such that a first counterweight of the first pair of counterweights is substantially aligned with a horizontal plane perpendicular to the central axis and a second counterweight of the first pair of counterweights is arranged at an angle of 60 degrees from the first counterweight of the first pair of counterweight;
a second pair of counterweights disposed on each side of the third crankpin, t

Assignees

• Electro Motive Diesel Inc

Inventors

• Goetzke Michael B
• Kumar Vijaya
• Yu Jin

Classifications

• F16C3/20

  Shape of crankshafts or eccentric-shafts having regard to balancing · CPC title

• F16C2360/22

  Internal combustion engines · CPC title

• F02B75/00 Primary

  Other engines · CPC title

• F16F15/283 Primary

  for engine crankshafts · CPC title

• F16C3/12

  releasably connected · CPC title