Balancer device for an internal combustion engine

Patent metadata

Field	Value
Publication number	US-2016258507-A1
Application number	US-201514850340-A
Country	US
Kind code	A1
Filing date	Sep 10, 2015
Priority date	Mar 3, 2015
Publication date	Sep 8, 2016
Grant date	—

Abstract

A balancer device for an internal combustion engine is provided, wherein the drive mechanism 8 and the oil pump 3 are arranged on the side opposite to driven balancer weight 135 in the axial direction of the driven balancer shaft 5.

First claim

What is claimed is:

1 . A balancer device comprising:
a drive unit to which a rotational force is transmitted from a crankshaft, a drive balancer shaft having a drive balancer weight rotated integrally with the drive unit, a balancer drive gear arranged on the same side as the drive unit with reference to the position of the drive balancer weight in the axial direction of the drive side balancer shaft, and rotated integrally with the drive balancer shaft, a balancer driven gear engaged with the balancer drive gear, a driven balancer shaft rotated integrally with the balancer driven gear and having a driven balancer weight provided on the same side as the drive balancer weight in the axial direction, a drive mechanism having a gear on the side opposite to the driven balancer weight in the axial direction of the driven balancer shaft, wherein the rotational force is transmitted to the drive mechanism from one of the balancer shafts, and an oil pump driven through the drive mechanism.

2 . The balancer device for the internal combustion engine according to claim 1 , wherein the drive mechanism comprises:
an oil pump drive gear provided on the driven balancer shaft, and an oil pump driven gear engaged with the oil pump drive gear.

3 . The balancer device for the internal combustion engine according to claim 2 , wherein the oil pump driven gear is provided on the side of the drive balancer shaft in a direction perpendicular to the axis of the driven balancer shaft.

4 . The balancer device for the internal combustion engine according to claim 3 , wherein an oil pump drive shaft provided on the oil pump driven gear and rotated integrally with the oil pump driven gear is disposed between the drive balancer shaft and driven balancer shaft in a direction perpendicular to the axis of the drive balancer shaft.

5 . The balancer device for the internal combustion engine according to claim 4 , wherein the oil pump is disposed between the drive unit and the oil pump driven gear in the axial direction of the drive balancer shaft.

6 . The balancer device for the internal combustion engine according to claim 2 , wherein the oil pump driven gear is provided on the side opposite to the drive balancer shaft in the direction perpendicular to the driven balancer shaft.

7 . The balancer device for the internal combustion engine according to claim 2 , wherein the teeth number of the oil pump drive gear and the oil pump driven gear is represented as NA, NB, respectively, and the following expression:
NA<NB
is satisfied.

8 . The balancer device for the internal combustion engine according to claim 2 , wherein the teeth number of the oil pump drive gear and the oil pump driven gear is represented as NA, NB, respectively, and the following expression:
NA≧NB

is satisfied.

9 . The balancer device for the internal combustion engine according to claim 1 , wherein the drive mechanism comprises:
an oil pump drive gear provided on the drive balancer shaft, an oil pump driven gear engaged with the oil pump drive gear.

10 . The balancer device for the internal combustion engine according to claim 1 , wherein the drive mechanism comprises:
an oil pump drive gear provided on the driven balancer shaft, an intermediate gear engaged with the oil pump drive gear, and an oil pump driven gear engaged with the intermediate gear.

11 . The balancer device for the internal combustion engine according to claim 1 , wherein the drive mechanism comprises an oil pump gear engaged with the balancer drive gear or the balancer driven gear.

12 . The balancer device for the internal combustion engine according to claim 1 , wherein a helical gear is used for the gear.

13 . The balancer device for the internal combustion engine according to claim 1 , wherein the rotational force is transmitted to the drive unit through a chain.

14 . The balancer device for the internal combustion engine according to claim 1 , wherein the oil pump is a variable displacement oil pump for varying the amount of the volume change in the pump chamber in response to a predetermined state.

15 . A balancer device for an internal combustion engine comprising;
a housing attached to the internal combustion engine, a drive balancer shaft rotationally received in the housing and having a drive balancer weight, a chain drive unit provided on one end of the drive balancer shaft, wherein a rotational force is transmitted to the chain drive unit from the crankshaft through a drive chain, a balancer drive gear provided between the drive balancer weight and the chain drive unit in the axial direction of the drive balancer shaft and rotated integrally with the drive balancer shaft, a balancer driven gear engaged with the balancer drive gear, a driven balancer shaft rotated integrally with the balancer driven gear, wherein the driven balancer shaft is received in the housing and has a driven balancer weight provided on the same side as the drive balancer weight in the axial direction, an oil pump drive gear provided on the side opposite to the driven balancer weight in the axial direction of the driven balancer shaft and rotated integrally with the driven balancer shaft, an oil pump driven gear engaged with the oil pump drive gear, and an oil pump driven by an oil pump driven gear.

16 . The balancer device for the internal combustion engine, according to claim 15 , wherein the oil pump is attached to the housing.

17 . The balancer device for the internal combustion engine, according to claim 16 , wherein the oil pump is disposed between the chain drive unit and the oil pump driven gear in the axial direction of the drive balancer shaft.

Assignees

• Hitachi Automotive Systems Ltd

Inventors

• Onigata Ryoji

Classifications

• F01M2001/0238

  Rotary pumps · CPC title

• F16F15/265

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

• F01M2001/0276

  driven by a balancer shaft · CPC title

• F16F15/264 Primary

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

• F02B67/06

  driven by means of chains, belts, or like endless members · CPC title