JPH0736196Y2 - Balancer device for internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a balancer device for an internal combustion engine that reduces vibration and noise of the internal combustion engine.

(Prior Art) Unbalanced inertial force on the crank mechanism at low engine speed,
Vibration caused by inertial force of the crankshaft system, such as unbalanced inertial couple, crankshaft bearing clearance, manufacturing error and elastic deformation of the shaft, etc., occurs due to inertial force of the crankshaft system. There is a drawback that it becomes a source of generation and is transmitted to the vehicle body to cause discomfort and fatigue to the occupants.

(Problems to be Solved by the Invention) The present invention provides a balancer device for an internal combustion engine capable of reducing vibration caused by rotational inertia of a crankshaft system of an internal combustion engine and noise induced by the vibration. It is in.

[Constitution of the Invention] (Means and Actions for Solving Problems) The sun rotor fixed to the shaft end of the crankshaft of the engine body, and the engine body so as to abut the outer peripheral surface of the sun rotor. A plurality of planetary rotating bodies axially attached to the sun rotating body, a ring-shaped sub flywheel that is arranged concentrically with the sun rotating body and transmits rotation in the opposite direction to the sun rotating body via the planetary rotating body; While rotating coaxially with the sun rotor and rotating in the same direction as the sun rotor,
It comprises a main flywheel in which the whole is formed in a case shape and the sun rotor, the planetary rotor and a sub flywheel are housed, and the sun rotor, the planetary rotor, the sub flywheel in the main flywheel, A balancer device for an internal combustion engine, characterized in that an elastic ring is provided. As described above, since the rotation of the planetary rotor is transmitted to the sub flywheel via the elastic ring, the transmission efficiency of the rotation to the sub flywheel can be improved.

(Embodiment) A balancer device for an internal combustion engine according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 (A) is a sectional view of a balancer device for an internal combustion engine, and FIG. 1 (B) is a sectional view taken along the line AA of FIG. 1 (A). In FIG. 1, reference numeral 11 is one end of a crankshaft axis of an engine (not shown). A disk-shaped sun roller 12 is fixed to one end of the crankshaft shaft 12. At one end of the sun roller 12, a case-shaped main flywheel 13 is attached to the sun roller 12.
It is fixed coaxially with. And the main flywheel
The sun roller 13 and the sun roller 12 are fixed to the crankshaft 11 by screws 14. A ring gear 131, which meshes with a pinion gear (not shown) when the engine is started, is fitted on the outer peripheral surface of the main flywheel 13. A plurality of rod-shaped planetary rollers 15 are concentrically arranged at predetermined intervals so as to contact the outer peripheral surface of the sun roller 12. The planetary roller 15 is pivotally supported by a roller shaft 19 so as to be held at a fixed position.

Further, 17 is a ring-shaped sub flywheel. An elastic ring 16 which is a ring-shaped body having a substantially U-shaped cross section and which is composed of an elastic member is attached to the inner circumference of the sub flywheel 17. The rotation of the planetary roller 15 is transmitted as a reverse rotation to the sub flywheel 17 via the elastic ring 16. This sub flywheel 17 is divided into two blocks A and B.
By tightening the screw 18 with the screw 18, the elastic ring 16 is tightened from both sides so that the inner surface of the elastic ring 16 presses the surface C that contacts the planetary roller 15. A roller shaft 19 which rotatably supports the planetary roller 15 is supported by a pin holder 20 and is fixed to a fixing member 21 such as an engine block so as to project therefrom. Further, 22 and 23 are oil seals, which seal the inside of the main flywheel 13.
Then, the sun roller 12, the planetary roller 15, the elastic ring 16, and the sub flywheel 17 are all put in the sealed main flywheel 13.

Further, 24 is an oil supply port for guiding the oil from an oil pan (not shown) into the main flywheel 13, and the oil is supplied from the oil supply port 24 so that the oil is always supplied to the position indicated by D in the main flywheel 13. 25 are satisfied.

Next, the operation of the present invention configured as described above will be described. When the engine is started, the crankshaft 11 rotates. The rotation of the crankshaft 11 causes the sun roller 12 to rotate, and with the rotation of the sun roller 12,
As the main flywheel 13 rotates, the rotation of the planetary rollers 15 causes the sub flywheel 17 to rotate in the opposite direction to the main flywheel 13. Here, due to the presence of the elastic ring 16, the rotation of the planetary roller 15 is accurately transmitted to the sub flywheel 15.

Since the elastic ring 16 is provided in this way, the planetary roller 15
Can be accurately transmitted to the sub flywheel 17, and the vibration and noise of the internal combustion engine can be efficiently reduced.

Further, by inserting the sub flywheel 17 in the main flywheel 13, it is possible to realize the downsizing of the device.

[Advantages of the Invention] As described in detail above, according to the present invention, it is possible to provide a balancer device for an internal combustion engine, which can reduce vibration and noise of the internal combustion engine and can achieve miniaturization.

[Brief description of drawings]

FIG. 1 (A) is a sectional view of a balancer device for an internal combustion engine according to an embodiment of the present invention, and FIG. 1 (B) is a side view of the device. 12 …… Sun roller, 13 …… Main flywheel, 15 …… Planetary roller, 16 …… Elastic ring, 17 …… Sub flywheel.

Claims (1)

[Scope of utility model registration request] 1. A solar rotor fixed to an axial end portion of a crankshaft of an engine body, a plurality of planetary rotors axially attached to the engine body so as to contact an outer peripheral surface of the sun rotor, A ring-shaped sub flywheel that is arranged concentrically with the sun rotor and that transmits rotation in the opposite direction to the sun rotor through the planetary rotor, and the sun that is fixed coaxially with the sun rotor. A balancer device for an internal combustion engine, which rotates in the same direction as the rotating body, and has a main flywheel that is formed in a case shape as a whole and internally houses the sun rotating body, the planetary rotating body, and a sub flywheel. .