Internal combustion engine

Patent metadata

Field	Value
Publication number	US-9528569-B2
Application number	US-201414496785-A
Country	US
Kind code	B2
Filing date	Sep 25, 2014
Priority date	Sep 26, 2013
Publication date	Dec 27, 2016
Grant date	Dec 27, 2016

Abstract

An internal combustion engine includes a crankcase, a case cover for covering a side of the crankcase, a crankshaft and a balancer shaft. A balancer has a balancer driven gear and a balance weight provided on the balancer driven gear and is acted upon and driven by a driving force of the crankshaft to rotate. An oil pump is accommodated in the crankcase and has an oil pump driving shaft disposed in parallel to the crankshaft and the balancer shaft. The oil pump includes a pump driven gear. The balancer has a pump driving gear which has a diameter smaller than that of the balancer driven gear and rotates together with the balancer driven gear. The pump driving gear meshes with the pump driven gear. The oil pump driving shaft is disposed within a range of rotation of the balance weight as viewed in an axial direction thereof.

First claim

What is claimed is:

1. An internal combustion engine, comprising:
a crankcase;
a case cover for covering a side of the crankcase;
a crankshaft;
a balancer including a balancer shaft, a balancer driven gear and a balance weight provided on the balancer driven gear, the balancer being acted upon and driven by a driving force of the crankshaft to rotate;
an oil pump accommodated in the crankcase and having an oil pump driving shaft disposed in parallel to the crankshaft and the balancer shaft, the oil pump including a pump driven gear; and
a pump driving gear on the balancer shaft, the pump driving gear having a diameter smaller than the diameter of the balancer driven gear and rotating together with the balancer driven gear, the pump driving gear axially spaced from the balancer driven gear and meshing with the pump driven gear,
wherein the oil pump driving shaft is disposed within a circle formed by an outer edge of the balance weight during rotation of the balance weight as viewed in an axial direction of the balancer shaft, and
wherein the balance weight is between the balancer driven gear and the case cover.

2. The internal combustion engine according to claim 1 , wherein the balancer is disposed in a space between the crankcase and the case cover, and
wherein the balancer shaft is supported by a case side supporting portion formed on a side wall face of the crankcase and a cover side supporting portion formed on an inner side face of the case cover.

3. The internal combustion engine according to claim 1 , wherein the balancer has the balancer driven gear disposed on the case cover side and the pump driving gear disposed on the crankcase side.

4. The internal combustion engine according to claim 2 , wherein the balancer has the balancer driven gear disposed on the case cover side and the pump driving gear disposed on the crankcase side.

5. The internal combustion engine according to claim 1 , wherein the balance weight is formed on an opposite outer side faces of the balancer driven gear which is opposed to the case cover.

6. The internal combustion engine according to claim 2 , wherein the balance weight is formed on an opposite outer side faces of the balancer driven gear which is opposed to the case cover.

7. The internal combustion engine according to claim 3 , wherein the balance weight is formed on an opposite outer side faces of the balancer driven gear which is opposed to the case cover.

8. The internal combustion engine according to claim 1 , further comprising:
a restriction member fastened and attached to a side wall face of the crankcase by a fastening member and configured to restrict movement of the oil pump driving shaft in an axial direction, the restriction member and the fastening member being included in the range of rotation of the balance weight as viewed in the axial direction of the oil pump driving shaft.

9. The internal combustion engine according to claim 2 , further comprising:
a restriction member fastened and attached to a side wall face of the crankcase by a fastening member and configured to restrict movement of the oil pump driving shaft in an axial direction, the restriction member and the fastening member being included in the range of rotation of the balance weight as viewed in the axial direction of the oil pump driving shaft.

10. The internal combustion engine according to claim 1 , wherein the crankcase is configured from divisional upper and lower side halves, and the balancer and the oil pump are disposed on a lower side half of the crankcase while the oil pump driving shaft is disposed below the balancer shaft.

11. The internal combustion engine according to claim 2 , wherein the crankcase is configured from divisional upper and lower side halves, and the balancer and the oil pump are disposed on a lower side half of the crankcase while the oil pump driving shaft is disposed below the balancer shaft.

12. The internal combustion engine according to claim 1 , further comprising:
a transmission; and
a clutch apparatus disposed in a rear of the crankshaft and driven to rotate by the crankshaft,
wherein the balancer shaft and the oil pump driving shaft being disposed between the crankshaft and a center shaft of the clutch apparatus in a forward and rearward direction.

13. The internal combustion engine according to claim 2 , further comprising:
a transmission; and
a clutch apparatus disposed in a rear of the crankshaft and driven to rotate by the crankshaft,
wherein the balancer shaft and the oil pump driving shaft being disposed between the crankshaft and a center shaft of the clutch apparatus in a forward and rearward direction.

14. The internal combustion engine according to claim 1 , wherein the oil pump is accommodated in an oil pump accommodation chamber defined in the crankcase, and
wherein the oil pump driving shaft is configured from a plurality of shaft members including a first shaft portion extending through the inside of the oil pump and a second shaft portion having the pump driven gear engaging with the pump driving gear of the balancer, the first shaft portion and the second shaft portion engaging with and being connected to each other at end portions.

15. The internal combustion engine according to claim 2 , wherein the oil pump is accommodated in an oil pump accommodation chamber defined in the crankcase, and
wherein the oil pump driving shaft is configured from a plurality of shaft members including a first shaft portion extending through the inside of the oil pump and a second shaft portion having the pump driven gear engaging with the pump driving gear of the balancer, the first shaft portion and the second shaft portion engaging with and being connected to each other at end portions.

16. An internal combustion engine, comprising:
a crankcase;
a case cover for covering a side of the crankcase;
a crankshaft;
a balancer including a balancer shaft, a balancer driven gear and a balance weight provided on the balancer driven gear, the balancer being acted upon and driven by a driving force of the crankshaft to rotate;
an oil pump accommodated in the crankcase and having an oil pump driving shaft disposed in parallel to the crankshaft and the balancer shaft, the oil pump including a pump driven gear; and
a pump driving gear on the balancer shaft, the pump driving gear having a diameter smaller than the diameter of the balancer driven gear and rotating together with the balancer driven gear, the pump driving gear axially spaced from the balancer driven gear and meshing with the pump driven gear,
wherein the oil pump driving shaft is disposed within a of circle formed by an outer edge of the balance weight during rotation of the balance weight as viewed in an axial direction of the balancer shaft,
wherein the crankcase is configured from divisional upper and lower side halves, and the balancer and the oil pump are disposed on a lower side half of the crankcase while the oil pump driving shaft is disposed below the balancer shaft.

17. The internal combustion engine according to claim 16 , wherein the balancer is disposed in a space between the crankcase and the case cover, and
wherein the balancer shaft is supported by a case side supporting portion formed on a side wall face of the crankcase and a cover side supporting portion formed on an inner side face of the case cover.

18. The internal combustion engine according to claim 16 , wherein the balancer has the balancer driven gear disposed on the case cover side and the pump driving gear disposed on the crankcase side.

Assignees

• Honda Motor Co Ltd

Inventors

• Sugiura Hiroyuki
• Oshita Toru

Classifications

• F16F15/264 Primary

  Rotating balancer shafts (F16F15/262 takes precedence) · CPC title

• F16F15/265

  Arrangement of two or more balancer shafts (F16F15/267 takes precedence) · CPC title

• F02B67/00

  Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for · CPC title

• F02B75/06

  Engines with means for equalising torque · CPC title

• F01M1/02

  using lubricating pumps (pumps in general F04; lubricating pumps per se F16N) · CPC title