JPS6221170Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a viscous damper that suppresses torsional vibration of a crankshaft.

The crankshaft of an internal combustion engine, etc., generates torsional vibration due to the torsional force generated when it receives shock from the engine's explosion process or rapid changes in rotational speed, causing engine noise and wear, and eventually causing damage to the engine. This will cause the crankshaft to break.

As a countermeasure to this problem, a torsional damper has conventionally been attached to the tip of the crankshaft to suppress torsional vibration.

There are various types of torsional dampers, such as those that utilize solid friction or liquid viscosity, and the latter type is a viscous damper. A viscous damper has a damper case that houses an inertial body on a disc-shaped plate attached to the crankshaft, and a liquid with high viscous resistance, such as silicone oil, is interposed between the inertial body and the damper case, and its viscosity is utilized. It is structured like this.

By the way, when the engine is started, the friction ring attached to the inertial body comes into contact with the inner wall of the damper case and wears out, so if the friction ring is used for a long time, the silicone oil will become powdered due to the mixing of wear powder from the friction ring. and lose its original function.
In this case, it is necessary to replace the silicone oil.

However, with the conventional damper case, it is not possible to see inside the damper case, so the deterioration status of the silicone oil as described above is not known at all and the damper is used as is. For this reason, there was a problem in that the torsional vibrations of the crankshaft increased, which adversely affected the engine.

This idea was made in view of the above circumstances.
To provide a viscous damper capable of knowing the deterioration state of a liquid and accurately determining its lifespan by installing a sampling device on a damper case that can appropriately take out a small amount of liquid inside the case without mixing air into the damper case. With the goal.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

In FIG. 1, a damper case 2 is formed around the periphery of a disc-shaped plate 1 which is pivotally attached to the tip of a crankshaft (not shown). This damper case 2
A ring-shaped inertial body 3 is housed inside, and friction rings 4 are provided at both ends of the inner circumferential wall of the inertial body 3.
is installed. Further, a liquid having high viscous resistance, for example, silicone oil 5, is interposed between the inner wall of the damper case 2 and the inertial body 3. The opening surface of the damper case 2 is closed with a metal lid 6 and sealed with a sealing member 7. A sampling device 1 is placed on the wall surface of the damper case 2 opposite to the lid 6, and is capable of appropriately taking out a small amount of the silicone oil 5.
0 is attached so that the deterioration status of the silicone oil 5 can be seen.

Details of the sampling device 10 are shown in FIG.

In the figure, an opening 11 is provided on the wall surface of the damper case 2 and communicates between the inside and outside of the case.
The inner side of the case forms a small diameter part, and the outer side of the case forms a large diameter part 11b having a thread groove. A first bolt 12 as a piston member having a small diameter liquid pressing part 12a that fits into the small diameter part 11a and a large diameter threaded part 12b that screws into the large diameter part 11b is inserted into this opening 11 with a compression clearance l. It is installed with the remaining parts. Further, a small hole 12c as an escape passage is provided in the center of the first bolt 12 in parallel to the opening 11.
is provided. Further, a second bolt 13 serving as a lid member for opening and closing this small hole 12c is inserted into the small hole 12c.
It is screwed into the screw groove provided on the outer side of the damper case c. The tip portion 13a of the second bolt 13 is formed to protrude in a conical shape. These first and second bolts 12 and 13 are tightened and fixed by first and second lock nuts 14 and 15, respectively. 16 is the liquid pressing part 1 of the first bolt 12
This is an O-ring that seals between the small diameter portion 11a of the opening 11 and the small diameter portion 11a of the opening 11.

In this configuration, in order to collect the silicone oil 5 inside the damper case 2, first remove the first lock nut 14, then remove the second lock nut 1.
Remove 5. Next, remove the second bolt 13 to open the small hole 12c for removing silicone oil. In this state, when the first bolt 12 enters the inner side of the damper case 2, the volume inside the damper case 2 becomes smaller, and the liquid pressing part 12 at the tip of the first bolt 12
The pressure of the silicone oil 5 sealed in the damper case 2 is applied by a. Due to this pressurization, excess silicone oil 5 flows out of the damper case 2 through the small hole 12c in the center of the first bolt 12. This flowing silicone oil 5 may be collected and the degree of deterioration of the oil 5 may be examined. In this way, by providing the sampling device 10, the silicone oil 5 inside the damper case 2 can be easily sampled at any time, so even if the inside of the damper case 2 cannot be observed, the life of the viscous damper can be accurately determined. It can be determined that Therefore, deterioration in the performance of the viscous damper can be prevented and the safety of the engine can be improved.

On the other hand, after collecting silicone oil 5, the second
The bolt 13 is screwed into the small hole 12c for liquid extraction to close the small hole 12c, and the second bolt 13 is fixed by the second lock nut 15. Furthermore, the first bolt 12 may be fixed by the first lock nut 14. Then, the second bolt 13 is attached to the small hole 1.
2c, the tip 1 of the second bolt 13
3a projects in a conical shape, the gap between the small hole 12c and the tip 13a gradually narrows, so that the small hole 12c can be closed without leaving air inside the damper case 2. Also,
In this sampling device 10, the first bolt 12
By removing the silicone oil 5 from the opening 11, the silicone oil 5 can be injected from the opening 11 when manufacturing the viscous damper, so there is no need to provide a separate injection port for the silicone oil 5.

It goes without saying that the configuration of the sampling device is not limited to this embodiment.

As described above, according to the present invention, the liquid inside the damper case can be sampled extremely easily, so the lifespan of the damper can be determined by examining the deterioration status of the sampled liquid, and a decline in damper performance can be prevented. . Therefore, the safety of the engine can be improved.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the present invention;
The figure shows an enlarged sectional view of the main part of FIG. 1. 1... Disk-shaped plate, 2... Damper case,
3... Inertial body, 5... Silicone oil, 10...
Sampling device, 11... Opening part, 12... First bolt (piston member), 12c... Small hole (escape passage), 13... Second bolt (lid member).

Claims (1)

[Claims for Utility Model Registration] (1) A disc-shaped plate is attached to the crankshaft, an inertial body is housed in a damper case formed on the plate, and viscous resistance is created between the damper case and the inertial body. A viscous damper configured with a large liquid interposed therein includes a piston member that changes the internal volume of the damper case by forward and backward movement, and a relief passage that releases the liquid that becomes surplus due to the movement of the piston member to the outside of the damper case. A viscous damper, characterized in that a damper case is provided with a sampling device capable of collecting a small amount of the liquid, which includes a lid member for opening and closing the passage. (2) The sampling device has a large-diameter screw portion that screws into a thread groove provided on the outside of the case in an opening that communicates between the inside and outside of the damper case, and a small-diameter screw that fits on the inside of the case in the opening. a first bolt as the piston member, which is provided with a liquid pressing part and a small hole as the escape passage provided in the center part parallel to the opening part; and a screw provided on the outer side of the damper case of the small hole. Consisting of a second bolt as the lid member that screws into the groove to open and close the small hole, and first and second lock nuts that fix both bolts when the first and second bolts are installed, A viscous damper according to claim 1, which is a registered utility model and is configured to take out liquid from a small hole by entering a first bolt and pressing the liquid. (3) The viscous damper according to claim 2, wherein the second bolt has a conical tip end projecting from the second bolt.