JPS603408Y2 - Engine vibration damping device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an engine vibration damping device that can be easily attached to an engine and has a large vibration damping effect.

An engine with poor balance, such as a V-type cylinder diesel engine, is generally equipped with several types of balancers to suppress primary and secondary vibrations caused by residual moment.

Conventionally, these balancers are all built into the engine body, which requires extra space within the engine body, making the engine larger.

Furthermore, the balancer described above is assembled into the engine main body as necessary after the engine is installed at a predetermined position, so there is a drawback that it takes time and effort to assemble the balancer.

This invention eliminates the above-mentioned conventional drawbacks, and one embodiment thereof will be described below with reference to the drawings.

Reference numeral 1 denotes an engine body, inside which a pair of primary balancers 2 and 2' are fixedly attached to a drive shaft 3 and rotated together with the drive shaft 3.

Reference numerals 4 and 5 denote transmissions that are linked to the drive shaft 3 via clutches 6.7, respectively, and loads 10.11 are directly connected to output shafts 8 and 9 of the transmissions 4 and 5, respectively.

In the illustrated example, one load 10 is a propulsion device and the other load 11
is a generator.

A secondary balancer 12.12' is provided on the outer side of the two transmissions 4, 5 in the direction of the axis a, in conjunction with the input shaft 13.14 of the respective transmission 4.5.

There are a plurality of secondary balancers 12, 12' (three in the illustrated example).
gears 15, 16, 17 and 15', 16'
, 17' rotates the drive shaft 3 at twice the rotation speed of the drive shaft 3.
They are designed to rotate in the same direction as the engine body 1, and are located a certain distance apart from the engine body 1 in the axial direction a and b', respectively, and the direction distance C9C' of the axis a to the center of gravity M of the engine body 1 is shall be equal.

In this embodiment, each secondary balancer 12, 12' is spaced a certain distance d, d in opposite radial directions with respect to the drive shaft 3.
'Although it is offset, it can also be provided coaxially with the drive shaft 3.

In the figure, 18.18' is the casing 19, 20 of the secondary balancer 12, 12' is the gear of one transmission 4, 21.22
is a gear of the other transmission 5, and 23 is a flywheel.

This device has the above-mentioned structure, and when the drive shaft 3 rotates, the primary balancers 2 and 2' rotate together with the drive shaft 3. This rotation causes the primary vibration of the engine body 1, i.e. Vibration at the same frequency as the rotational speed of the drive shaft 3 is suppressed.

Also, as the drive shaft 3 rotates, the secondary balancer 12.12'
rotates at twice the rotation speed of the drive shaft 3, this rotation suppresses secondary vibrations at a frequency twice the rotation speed of the drive shaft 3.

In this case, the secondary balancer 12, 12' is provided on the outside of the transmissions 4, 5, and is located at a sufficient distance from the engine body 1, which is the source of vibration, so it cannot be incorporated into the engine body as in the conventional case. The balancer has a greater vibration damping effect than the conventional balancer, and not only can vibrations be suppressed, but the balancer itself can be made smaller.

Furthermore, since the balancer is installed outside the engine body, the engine body can be made smaller in size compared to when it is built into the engine body, and the balancer installation is easy and requires no effort.

[Brief explanation of the drawing]

The drawing is a schematic diagram of the engine vibration damping device according to this invention. 1...Engine body, 3...Drive shaft,
4,5...transmission, 12. 12'...
・Secondary balancer, a...axis, b, b'...
...separation distance.

Claims (1)

[Scope of utility model registration request] A vibration damping device for an engine, characterized in that a balancer is disposed at a position separated from the engine body in the axial direction via a transmission, and rotates in conjunction with the drive shaft of the engine at a rotation speed different from that of the drive shaft.