# US 2014/0190442 A1 · Balancer device of internal combustion engine

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- Number: US 2014/0190442 A1
- Document ID: US20140190442A1
- Status: Published application
- Kind: A1
- Application number: 14/148,120
- Filed: 2014-01-06
- Published: 2014-07-10
- Earliest claimed: 2013-01-09
- Assignees: Hitachi Automotive Systems, Ltd.
- Applicants: Hitachi Automotive Systems, Ltd.
- Inventors: Masaharu Saito; Tamotsu Todo; Masaharu Kitamura; Harunobu Okabe; Seiji Tsuruta; Takashi Hirano
- Web page: https://patentgrep.com/patent/US20140190442A1

## CPC

- F16F 15/264: {Rotating balancer shafts (F16F15/262 takes precedence)}
- F16H 55/18: Special devices for taking up backlash {(for gears having orbital motion F16H1/2863)}
- F16F: SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16H: GEARING

## Abstract

A balancer device of an internal combustion engine, has a drive gear engaged with an input gear to which a rotation force is transmitted from a crankshaft; a balancer drive shaft to which the rotation force is transmitted from the drive gear and which has a balancer weight; a balancer drive gear rotating integrally with the balancer drive shaft; a balancer driven gear engaged with the balancer drive gear; and a balancer driven shaft rotating integrally with the balancer driven gear and having a balancer weight. At least one of the drive gear, the balancer drive gear and the balancer driven gear is provided, on both axial direction side surfaces thereof, with ring-shaped grooves whose diameters are different from each other. The ring-shaped grooves are formed up to a depth from the surface of the gear at which both the ring-shaped grooves overlap each other in the axial direction.

## Claims

### Claim 1

A balancer device of an internal combustion engine, comprising:
a drive gear that is engaged with an input gear to which a rotation force is transmitted from a crankshaft;
a balancer drive shaft to which the rotation force is transmitted from the drive gear, the balancer drive shaft having a balancer weight;
a balancer drive gear that is provided so as to rotate integrally with the balancer drive shaft;
a balancer driven gear that is engaged with the balancer drive gear; and
a balancer driven shaft that is provided so as to rotate integrally with the balancer driven gear, the balancer driven shaft having a balancer weight, and
at least one of the drive gear, the balancer drive gear and the balancer driven gear being provided, on both axial direction side surfaces thereof, with ring-shaped grooves whose diameters are different from each other, and
the ring-shaped grooves being formed up to a depth from the surface of the gear at which both the ring-shaped grooves overlap each other in the axial direction.

### Claim 2 (depends on 1)

The balancer device of the internal combustion engine as claimed in claim 1, wherein:
an elastic member is provided in the ring-shaped groove.

### Claim 3 (depends on 2)

The balancer device of the internal combustion engine as claimed in claim 2, wherein:
the elastic member is rubber material.

### Claim 4 (depends on 3)

The balancer device of the internal combustion engine as claimed in claim 3, wherein:
the elastic member is an O-ring.

### Claim 5 (depends on 2)

The balancer device of the internal combustion engine as claimed in claim 2, wherein:
the ring-shaped groove is formed so that a width of an opening of the ring-shaped groove is narrower than a width of a bottom of the ring-shaped groove.

### Claim 6 (depends on 5)

The balancer device of the internal combustion engine as claimed in claim 5, wherein:
the ring-shaped groove tapers from the bottom to the opening so that the opening width is narrower than the bottom width.

### Claim 7 (depends on 2)

The balancer device of the internal combustion engine as claimed in claim 2, wherein:
the ring-shaped groove is formed so that a bottom of the ring-shaped groove is positioned at an outer peripheral side of the drive gear with respect to an opening of the ring-shaped groove.

### Claim 8 (depends on 2)

The balancer device of the internal combustion engine as claimed in claim 2, wherein:
a groove whose diameter is larger or smaller than an outer circumference of the ring-shaped groove is formed in the ring-shaped groove.

### Claim 9 (depends on 1)

The balancer device of the internal combustion engine as claimed in claim 1, wherein:
a large diameter ring-shaped groove is formed on one of the both side surfaces of the drive gear which is on a balancer weight side in an axial direction of the balancer drive shaft, and
a small diameter ring-shaped groove is formed on the other side surface of the drive gear.

### Claim 10 (depends on 1)

The balancer device of the internal combustion engine as claimed in claim 1, wherein:
a small diameter ring-shaped groove is formed on one of the both side surfaces of the drive gear which is on a s balancer weight side in an axial direction of the balancer drive shaft, and
a large diameter ring-shaped groove is formed on the other side surface of the drive gear.

### Claim 11

A balancer device of an internal combustion engine, comprising:
a drive gear that is engaged with an input gear to which a rotation force is transmitted from a crankshaft;
a balancer drive shaft to which the rotation force is transmitted from the drive gear, the balancer drive shaft having a balancer weight;
a balancer drive gear that is provided so as to rotate integrally with the balancer drive shaft;
a balancer driven gear that is engaged with the balancer drive gear; and
a balancer driven shaft that is provided so as to rotate integrally with the balancer driven gear, the balancer driven shaft having a balancer weight, and
at least one of the drive gear, the balancer drive gear and the balancer driven gear being provided, on both axial direction side surfaces thereof, with ring-shaped grooves whose diameters are different from each other, and
at least one of the ring-shaped grooves being present in any axial direction position from one of the both side surfaces of the gear to the other side surface of the gear.