JPH01271609A - Vibration suppressing device in power plat system - Google Patents

Abstract

PURPOSE:To suppress the vibration of an oil pan so as to decrease the emitting sound by depositing dumping material in a plural number of slits formed from around the bottom part of a cylinder block through the bottom wall of an oil pan and spreading them in a row. CONSTITUTION:An oil pan 3 connected to the bottom edge part of the cylinder block 1 of an engine E and the side of the engine of an transmission case 4 is provided. Then, a plural number of slits 8 which extend in a row and are located in the position A on the oil pan 3 at a prefixed distance L from the edge on the side of the engine of the transmission case 4 in the direction of an engine output axis and formed along the bottom wall of the oil pan 3 from the vicinity of the bottom part of the cylinder block 1, and at the same time, dumping material 9 is deposited in these slits 8. This process makes it possible to decrease the emitting sound from the oil pan 3 without decreasing the coupling rigidity of the cylinder block 1 with the transmission case 4.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a vibration suppressing device for a power plant system, which is constructed by fixing a transmission case to an end of a cylinder block of a vehicle engine.

(Prior art) In an automobile power plant system, a cylinder block and a transmission mechanism, each of which is heavy, are integrated by bolts at the rear end face of the cylinder block and the front end face of a transmission case. As a result, bending vibrations (power plant bending) occur at this joint, and excessive vibrations are excited, particularly in the resonance region, resulting in unpleasant muffled noise inside the vehicle interior.

Therefore, as disclosed in, for example, Japanese Utility Model Application No. 61-70543, the lower part of the cylinder block and the transmission case have been connected by a reinforcing member called a "stiffener" bolted thereto. This increases the rigidity of the joint.

In addition, the oil pan or a sound-insulating oil van cover that covers the outer periphery of the oil pan is made of cast metal, and a semicircular flange that corresponds to the lower part of the transmission case is provided at the rear of the oil pan or oil pan cover. ,
It is also known that this flange is fastened to the lower front end surface of the transmission case to prevent power plant bending.

However, with the above configuration, vibrations from the transmission case are directly transmitted to the oil pan or oil pan cover, and this together with the vibrations transmitted from the cylinder block increases the sound radiated from the oil pan or oil pan cover. There were drawbacks.

On the other hand, there is a technology in which a plurality of slits are provided in an engine cover such as an oil pan along the mounting surface to the engine, and the slits are filled with a damping material to reduce sound radiated from the cover. Japanese Unexamined Patent Publication No. 59-25
It is disclosed in Publication No. 037.

(Object of the Invention) The present invention provides an oil pan or a sound-insulating oil van cover that covers the outer periphery of the oil pan to increase the rigidity of the connection between the cylinder block and the transmission case. Provides a vibration suppression device for power plant systems that suppresses the vibration of the oil pan or oil pan cover and reduces radiated sound without reducing the joint rigidity between the cylinder block and transmission case by devising the formation position of the The purpose is to

(Structure of the Invention) The present invention provides an oil pan or oil pan cover 4 that is fastened to the lower end of the cylinder block of the engine and the engine side end of the transmission case, and the oil pan or oil pan cover is connected to the transmission case. Forming a plurality of slits extending in a line from near the lower end of the cylinder block to the bottom wall of the oil pan or oil pan cover at a position a predetermined distance away from the engine side end in the engine output shaft direction, A feature is that these slits are filled with a damping material.

(Effects of the Invention) According to the present invention, it is possible to reduce sound radiated from the oil pan or the oil pan cover without reducing the coupling rigidity between the cylinder block and the transmission case.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

Fig. 1 is a side view showing a power plant system vibration suppression device according to an embodiment of the present invention, Fig. 2 is a partial plan view of its oil pan, and Fig. 3 is taken along line ■-m in Fig. 2. FIG.

In Fig. 1, ■ is the cylinder block of engine E, and the upper part of this cylinder block 1 has a cylinder head 2.
is installed, and a cast oil pan 3 is installed at the bottom. A transmission case 4 is connected to the rear end of the cylinder block 1 by bolts 5, and the front portion of the transmission case 4 is a clutch housing 6. The oil pan 3 is fastened to the entire upper end of the cylinder block 1 and the engine side end of the transmission case 4 by bolts 7.

The oil pan 3 is provided in a line from near the lower end of the cylinder block 1 to the bottom wall 3a of the oil pan 3 at a predetermined distance fA away from the engine side end of the transmission case 4 in the engine output shaft direction. A plurality of extending slits 8 are formed, and each of these slits 8 is filled with a damping material 9 made of rubber or the like.

Although the slit 8 is formed in a direction perpendicular to the engine output shaft in FIG. 1, it may be formed obliquely toward the rear from position A as shown in FIG. In the configurations shown in FIGS. 1 and 2, the rear part of the oil pan 3 from the position A is rigidly connected to the cylinder block 1, but the part in front of the position A is connected to the cylinder block 1 and the oil pan. The cylinder block 1 is flexiblely connected to the cylinder block 1 by a floating rubber (not shown) interposed between the cylinder block 3 and the cylinder block 1.

The front part of the oil pan 3 is flexibly connected to the cylinder block 1 by using a slit 8 filled with a damping material 9 on the clamping surface of the cylinder block 1, as shown in FIG. 5, instead of using the floating rubber described above. This can also be achieved by adding along the line.

Next, FIG. 6 shows that the oil pan 3' is formed of an iron plate, and the cylinder block 1 and transmission case 4 are connected by a sound-insulating oil van cover 10 made of cast metal that covers the outer periphery of the oil pan 3'. A fifth slit 8 filled with damping material 9 is formed in the pan cover 10.
This is a case where it is provided in the same manner as shown in the figure.

FIG. 7 shows the distance from the entire end surface of the transmission case 4 to the position A where the slit 8 is provided in the oil pan 3 (assuming the total length is 100%) in the configuration shown in FIG. 1! (%)
Point 0 P, which is a line graph showing the relationship between the power plant bending resonance frequency (H2) and the power plant bending resonance frequency (H2), indicates the case where the rear part of the oil pan 3 is not connected to the transmission case 4, which causes a resonance of 200 to 300 Hz, This is the cause of the muffled sound. In the embodiment of the present invention, from the entire end surface of the transmifusitan case 40,
By selecting the distance #l in the range of 15 to 50% of the total length of the oil pan 3, the rigidity of the connection between the cylinder block 1 and the transmission case 4 is not reduced.
It has been confirmed through experiments that the sound radiated from the oil pan 3 can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a side view of an embodiment of the present invention, FIG. 2 is a partial plan view of the oil pan, and FIG. 3 is a partially enlarged cross-sectional view taken along line m-m in FIG. 4 to 6 are side views of other embodiments of the present invention, and FIG. 7 is a graph for explaining the present invention. 1...Cylinder pro, ri 3-Oil pan 4-...
Transmission case 6...Clutch housing 8-...Slit 9-Damping material 10
−Oil pan cover

Claims (1)

[Claims] An oil pan or oil pan cover is provided that is fastened to the lower end of the engine's cylinder block and the engine side end of the transmission case. forming a plurality of slits extending in a line from near the lower end of the cylinder block to the bottom wall of the oil pan or oil pan cover at a position a predetermined distance away from the cylinder block;
A vibration suppression device for a power plant system, characterized in that these slits are filled with a damping material.