JPS6141460Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to an improved dynamic damper suitable for diesel engines, particularly high speed, large diesel engines.

Conventionally, in this type of high-speed diesel engine, in order to damp the torsional vibration of the crankshaft,
Dynamic dampers have been used: rubber dampers, viscous dampers, and viscous rubber dampers.

The damping effect of the viscous damper is that of rubber.
dampers, and viscous rubber dampers outperform those dampers. Additionally, rubber dampers with a simple structure have been used for relatively small engines, and viscous dampers and viscous rubber dampers have been used for medium and large engines.

However, the structure of the viscous rubber damper is complicated, and the viscous rubber damper
In the case of dampers, the inertia ring contacts the casing, which causes wear problems and makes long-term use difficult.

The purpose of this invention is to eliminate wear caused by contact between the inertia ring and the casing.
Another object of the present invention is to provide a dynamic damper that has excellent inertia effects and damping effects and effectively damps torsional vibrations of a crankshaft without making the structure extremely complicated.

Preferred specific examples of the dynamic damper according to this invention will be described below with reference to the drawings.

1 and 2 show an embodiment 10 of a dynamic damper of the invention adapted for use in a truck diesel engine.

This dynamic damper 10 includes a disk 11 attached to a crankshaft (not shown),
An annular chamber 12 integrally formed on the outer peripheral edge of the disk 11, and a plurality of annular chambers 12 arranged at appropriate intervals in the circumferential direction within the annular chamber 12 so as to divide the inside of the annular chamber 12 into zigzag passages. partition plates 13 and 14;
The annular chamber 12 is divided into sections 14 and is composed of a fluid 15 with a large specific gravity filled in the annular chamber 12.

The disk 11 is provided with a shaft hole 16 for fitting into the crankshaft, and also provided with a plurality of bolt holes 17 for screwing into a pulley (not shown) fixed to the crankshaft.

As understood from FIG. 1, the annular chamber 12 is composed of a chamber body 18 formed in an annular groove at the outer peripheral edge of the disk 11, and an annular lid plate 19 that closes the opening of the chamber body 18. ing. Of course, the lid plate 19 is hermetically fixed to the chamber body 18 by caulking the outer and inner annular lips 20, 21 of the chamber body 18, and cooperates with the chamber body 18 to attach the annular chamber 12. Configure.

As can be understood from FIG. 2, the partition plates 13 and 14 are made shorter than the groove width of the chamber body 18, and are fixed within the chamber body 18 at appropriate intervals in the circumferential direction. A zigzag passage is formed within 18.

Annular chamber 12 made in the zigzag passage
The fluid 15 filled in is mercury, barium oxide, or the like, which has a high specific gravity.

As such, the fluid 15 constitutes an inertia ring in a conventional dynamic damper, the relative flow of the fluid 15 within the annular chamber 12 being resisted by the partition plates 13, 14; It effectively converts torsional vibration energy into thermal energy, providing inertial and damping effects.

In particular, the flow characteristics of the fluid 15 are changed depending on the shape, dimensions, arrangement spacing, etc. of the partition plates 13, 14, so the partition plates 13, 14 are determined according to the size of the engine, and the characteristics of the damper are determined according to the size of the engine. Easily adjust damping performance.

According to this invention, a fluid with a large specific gravity constitutes an inertial body, and the annular chamber filled with the fluid is configured in a zigzag passage, so that the torsional vibration energy of the crankshaft is converted into thermal energy. the torsional vibration of its crankshaft is effectively damped, the inertia effect and damping effect are improved, and the occurrence of wear such as due to contact between the inertia ring and the casing is prevented,
Furthermore, extreme structural complexity is prevented.

[Brief explanation of the drawing]

FIG. 1 is an axial sectional view of a dynamic damper of this invention applied to a truck diesel engine, and FIG. 2 is a partial sectional view taken along line 2--2 in FIG. 10... Dynamic damper, 11... Disk, 12... Annular chamber, 13, 14... Partition plate, 15... Fluid, 18... Chamber body, 19... Annular cover plate, 20... Outer annular shape Lip, 21...Inner annular lip.

Claims (1)

[Claims for Utility Model Registration] A disk attached to a crankshaft, an annular chamber formed on the disk, and an appropriate groove formed in the annular chamber in the circumferential direction so as to divide the inside of the annular chamber into a zigzag passage. A dynamic damper that includes a large number of partition plates arranged at intervals and a fluid with a high specific gravity filled in an annular chamber defined by the partition plates.