JPS585146Y2 - Cylinder block vibration damping device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a vibration damping device for a cylinder block used in an engine or the like.

One type of engine vibration is that the cylinder block that defines the side peripheral wall of the combustion chamber is vibrated due to the impact caused by combustion and the impact caused by piston slap, which occurs in the combustion chamber. force
This is due to the vibration of the top part being emitted into the atmosphere.

Conventionally, a countermeasure has been to increase the rigidity of the cylinder block, but simply increasing the rigidity only moves the vibration frequency range to a higher frequency range, and there is a practical upper limit to increasing the rigidity. .

In view of the above-mentioned circumstances, it is an object of the present invention to provide a cylinder block vibration damping device that can be configured without particularly changing the shape of the cylinder block and performs effective vibration absorption.

According to the present invention, this object is achieved by fitting a ring member that can move relative to a part of the cylinder block, and causing the cylinder block and the ring member to move relative to each other due to the vibration of the cylinder block. This is achieved by a cylinder block vibration damping device configured to damp the vibrations of the cylinder block due to friction between the two.

According to this configuration, when the cylinder block is vibrating at a relatively high frequency, the ring member forms a vibration system different from the vibration system of the cylinder block, the so-called main vibration system, which is a so-called vibration absorption system. During vibration, a relative movement occurs to the cylinder block, and the friction therebetween, particularly dry friction, damps the vibration of the cylinder block.

Hereinafter, the present invention will be described in detail with reference to an actual winding example using the accompanying drawings.

The attached FIG. 1 is a longitudinal cross-sectional view showing a cylinder block of an engine incorporating a vibration damping device according to the present invention, and the second tooth is a view in the direction of arrow A of the first one.

In these figures, reference numeral 1 indicates a cylinder block of a multi-cylinder engine, and the cylinder block 1 is a cylinder part that is engaged with two screws and two bolts and defines the side peripheral wall of the combustion chamber 3. 4, and a skirt portion 6k defining the crank chamber 5.
,have.

A cooling water passage 7 is provided in the cylinder part 4 so as to surround the combustion chamber 2, and a cylinder head 8 is attached to the upper part of the cylinder part 4 to limit the upper end of the combustion chamber 3. .

The cylinder head 8 includes an intake port 10 that is opened and closed by an intake valve 9.

An oil pan 11 is attached to the lower part of the skirt part 6, and a bearing part 12, which cooperates with a bearing cap 13 and supports the main bearing part of the crankshaft (not shown in the figure), is installed between each cylinder. It is set in.

A ring member 1 for vibration damping is provided inside the skirt portion 6.
4 are provided for each cylinder, two as shown in FIG.

In this actual case, the ring members 14 are formed into an arcuate shape by metal having appropriate spring properties, and each of the ring members 14 is attached at both ends to the side walls of the bearing portion 12 facing each other. They are elastically engaged, and are elastically engaged with an engagement groove 15 formed in the inner wall of the skirt portion 6 at the center portion.

The natural frequency of the ring member 14 is set to a value equal to the disturbance frequency of the cylinder block 1, so that the ring member 14 moves relative to the cylinder block when it vibrates at a relatively high frequency. There is.

When the cylinder block 1 vibrates at a relatively high frequency due to the shock caused by the combustion generated in the combustion chamber 3 and the vibration caused by the piston slap of the piston 2, the ring member 14 moves into the vibration system of the cylinder block 1, that is, the main vibration system. In contrast, a separate vibration absorption system is formed, which generates relative movement with respect to the cylinder block 1, and the vibrations of the cylinder block 1 are damped by the friction therebetween.

As described above, according to the present invention, the vibration of the cylinder block can be favorably damped and engine noise can be damped with an extremely simple structure in which a ring member is fitted to the cylinder block.

[Brief explanation of the drawing]

Fig. 1 is a schematic vertical sectional view showing an example of an engine cylinder block equipped with a vibration damping device according to the present invention;
The figure is a view taken in the direction of arrow A in FIG. 1... Cylinder block, 2. ...Piston, 3.
... Combustion chamber, 4.../Linda part 1.5... Crank chamber, 6... Skirt part, 7... Cooling water passage, 8...
・Cylinder head 9...Intake valve, 10...Intake port, 11...Oil pan, 12...Bearing part, 1
3...Bearing cap, 14...Ring member,
15...Engagement groove.

Claims (1)

[Scope of utility model registration request] A ring member that can move relative to a part of the cylinder block is fitted, and the cylinder prolug b
A vibration damping device for a cylinder block, characterized in that the vibration of the cylinder block is damped by friction between the cylinder block and the ring member due to relative movement caused by vibration.