JP3038438B2 - How to use the damper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method of using a damper according to a vibration absorbing technique,
In particular, it effectively absorbs bending vibration generated in the crankshaft.

[Conventional technology]

Conventionally, a bending damper in which an annular hub and an annular mass body are combined concentrically and the hub and the mass body are connected to each other via a rubber-like elastic body is known. The bending damper is attached to a front end or a rear end of a crankshaft of the internal combustion engine, and absorbs and attenuates bending vibration generated in the shaft by a resonance action.

[Problems to be solved by the invention]

As described above, conventionally, the bending damper is attached to a front end or a rear end of a crankshaft protruding outside a cylinder block. The reason is considered to be to easily perform the operation of attaching the damper to the crankshaft and the subsequent maintenance, but there is a problem that a large vibration absorbing effect cannot be obtained because the attachment portion is separated from the antinode of the vibration amplitude. This problem is particularly conspicuous in a six-cylinder engine. In the case of a six-cylinder engine, since the movement of the tip of the crankshaft is restricted by the bearing of the cylinder block, the amplitude is small, and a damper is attached to the tip. However, the vibration absorbing effect cannot be expected.

[Means for solving the problem]

In view of the above, the present invention aims at effectively absorbing bending vibration generated in a crankshaft by devising a mounting place of a bending damper. To achieve this object, first, according to claim 1, The method of using the damper is to mount a damper in which a hub and a mass body are connected via an elastic body on a crankshaft to absorb vibration generated in the crankshaft. Wherein the damper is mounted on the crankshaft between the cylinder block and the first cylinder.

The method of using the damper according to claim 2 of the present invention is as follows.
A method of mounting a damper, in which a hub and a mass body are connected via an elastic body, on a crankshaft to absorb vibration generated in the crankshaft, wherein the vibration is generated at the center of the crankshaft in a cylinder block of a six-cylinder engine. hand,
The damper is mounted on the crankshaft between two cylinders adjacent to each other.

(Operation)

The bending vibration generated in the crankshaft generally has the largest amplitude in the middle part of the shaft located in the cylinder block. On the other hand, a bending damper, which is a type of dynamic damper, is most effectively mounted on a portion having the largest amplitude. Focusing on these points, the present invention is characterized in that the mounting location of the damper has been changed from the leading end or the trailing end of the crankshaft to the above-described appropriate portion in the intermediate portion in the cylinder block.

〔Example〕

 Next, examples of the present invention will be described.

In the case of a four-cylinder engine, an antinode of the vibration amplitude is likely to be formed near the end of the crankshaft in the cylinder block. Therefore, as shown in FIG. 1, the bending damper (1)
Is mounted on the crankshaft (12) between the block (11) and the first cylinder (13) inside the cylinder block (11) (right side in the figure). The bending damper (1)
As shown in an enlarged manner in FIG. 2, a bush type damper is used in which a hub (2) and a mass body (3) are arranged in the radial direction, and an annular rubber-like elastic body (4) is press-fitted therebetween.

In the case of a six-cylinder engine, an antinode of the vibration amplitude is likely to be formed near the center of the crankshaft in the cylinder block. Therefore, as shown in FIG. 3, the bending damper (1)
Is mounted on the crankshaft (12) between two cylinders (14) (15) placed next to each other. Bending damper (1)
As shown in an enlarged view in FIG. 4, a disk-type damper in which a hub (2) and a mass body (3) are arranged in the axial direction and an annular rubber-like elastic body (4) is interposed and bonded therebetween. Use

However, in the above two examples, the type of the damper (1) to be mounted is not particularly limited, and any type of damper may be used. As shown in FIG. 5, some dampers have both a bending damper (1) and a torsional damper (5). However, such a damper may be used.

Conventional dampers are all combinations of annular bodies,
To attach such a damper to the intermediate portion of the crankshaft requires some contrivance. To address this, the following method is conceivable.

That is, as a first method, the damper is attached to the crankshaft in the crankshaft assembling process. In general, a crankshaft is divided and formed for each crank throw, and the throw is connected in the axial direction. Before this connection, a damper formed as an annular body is fitted to a predetermined flow.

As a second method, the damper is divided and formed in the circumferential direction, and is hung on the crankshaft. For example, as shown in FIG. 6 and FIG. 7, the damper (1) is formed into two parts each of the hub (2), the elastic body (4) and the mass body (3), and the hub (2) is connected to the band (6). ) And fasten the mass body (3) with bolts (7). Outside of the bolt stop,
As shown in FIG. 8, it is conceivable to use rivets (8) or pins (not shown), or the mass body (3) may be banded.

〔The invention's effect〕

 The present invention has the following effects.

That is, the method according to claim 1 of the present invention having the above-described structure is applied to a four-cylinder engine, and the method according to claim 2 is applied to a six-cylinder engine on the crankshaft in the cylinder block where the vibration amplitude is the largest. The damper will be mounted on the vehicle. Therefore, the vibration absorption performance by the damper can be maximized, and a vibration absorption structure exhibiting excellent vibration absorption performance can be realized for a crankshaft of a 4-cylinder or 6-cylinder engine, and an excellent vibration-absorbing effect can be obtained. be able to.

[Brief description of the drawings]

FIG. 1 is an explanatory view of the arrangement of a damper showing a method of use according to an embodiment of the present invention, FIGS. 2, 4, 5, and 6 are half sectional views of the damper, respectively, and FIG. FIG. 7 is a partially cutaway half cutaway view of a damper showing a method of using the damper according to another embodiment, and FIG. 8 is a partially cutaway perspective view of a mass body. (1) bending damper, (2) hub, (3) mass body, (4)
Rubber-like elastic body, (5) torsional damper, (6) band, (7) bolt, (8) rivet, (11) cylinder block, (12) crankshaft, (13) (14) (15)
Cylinder

Claims (2)

(57) [Claims] An elastic body (4) for connecting a hub (2) and a mass body (3).
The damper (1) connected via the crankshaft (1
2) a method of absorbing vibration generated in the crankshaft (12) by mounting the cylinder block (11) and the first cylinder (13) inside a cylinder block (11) of a four-cylinder engine. Mounting the damper (1) on the crankshaft (12). 2. An elastic body (4) comprising a hub (2) and a mass body (3).
The damper (1) connected via the crankshaft (1
2) a method of absorbing vibration generated in the crankshaft (12) by attaching to the center of the crankshaft (12) in a cylinder block (11) of a six-cylinder engine and adjacent to each other. A method of using a damper, comprising mounting the damper (1) on the crankshaft (12) between two cylinders (14) and (15).