JPS5819328Y2 - Vibration isolation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device that is interposed between two objects that vibrate and that interrupts vibration transmission between the two objects.

Generally, when there are two objects that vibrate, such as the crankcase of an internal combustion engine and an oil pan attached to the bottom of the crankcase, the vibration of the crankcase causes not only the vibration noise of the lower part of the crankcase but also the vibration noise of the oil pan. Therefore, countermeasures against vibration are urgently needed.

For this reason, conventionally, by interposing an elastic body such as rubber or synthetic resin with a sealing effect in the interconnection between the crankcase and the oil pan, vibrations transmitted from the crankcase are isolated at the interconnection. 2. Description of the Related Art A vibration isolation device that prevents vibration noise from an oil pan is known.

However, in the conventional vibration isolating device as described above, the elastic body is fixedly attached using tightening fixtures such as bolts and nuts, so vibrations are transmitted through the tightening fixtures. be exposed.

Furthermore, since the elastic body is used in a compressed state, its spring constant increases, reducing the vibration isolation effect of the elastic body, making it impossible to achieve satisfactory vibration isolation.

In this case, it is possible to improve the vibration isolation effect if the tightening force of the above-mentioned tightening fixture is set to an appropriate level and an appropriate compressive force is applied to the elastic body. The oil sealability between the elastic body and the object is poor, and this is inconvenient when applied between two objects that require an oil seal, such as the interconnection between the crankcase and the oil pan.

In order to eliminate the above-mentioned drawbacks, the elastic body may be directly bonded to the crankcase and oil pan during assembly without using a tightening fixture, but such vulcanization bonding work was difficult.

Also, Utility Model Application No. 51-112143 and Utility Model Application No. 51-11
As seen in No. 2144, there are some models in which an elastic body is interposed between the 2VO bodies using a tensioning tool, but in this case, the initial load of the elastic body is set at the time of assembly, so the assembly work is easy. Because it is difficult, we did not intend to make this setting.
This was simply a matter of using an elastic body to isolate vibrations and create a seal between two objects.

In view of the above-mentioned drawbacks of the conventional ones, the present invention has been proposed to sandwich and fix an elastic body between two plate-like members having at least rigidity, and at the same time provide a support for the plate-like members to prevent damage to the elastic body. By connecting the two plate-shaped members to two objects, the elastic body can be fixedly attached to two objects so that the elastic body does not become excessively compressed or tensile. The present invention provides a vibration isolation device that is used with a spring constant that provides a sufficient vibration isolation effect.

Hereinafter, one embodiment of the present invention will be described based on FIGS. 1 to 4.

FIG. 1 is a side view of an engine body to which the present embodiment is applied, and FIG. 2 is an enlarged view of the X portion of the same.

In the figure, a vibration isolating device 3 according to the present invention is installed at an interconnection portion between a crankcase 1 and an oil pan 2.

That is, as shown in FIGS. 2 and 3, this vibration isolating device 3 is constructed by using rubber or other metal plates between two frame-shaped metal plates 4 and 5 as frame-shaped members along the oil pan flange surface. A similarly frame-shaped elastic body 6 made of synthetic resin or the like is sandwiched and vulcanized and bonded.

A plurality of supports 7 are provided in the circumferential direction of the metal plates 4 and 5 to connect both side surfaces of the two metal plates 4.degree.5.

This support 7 has high rigidity (spring constant: 2) only in the direction in which the metal plates 4 and 5 are separated from each other, that is, in the tensile direction.
, 5 and in the direction in which the metal plates 4 and 5 approach each other, the rigidity is low (spring constant 1"> 20). Welded or set screws 8 on both sides of ,5
Fix by fixing means such as

In this case, the elastic body 6 is left in a stress-free natural state, or is left in a slightly compressed state due to the tensile force of the support 7.

For the support 7, it is preferable to use a plate-like member such as a thin steel plate, a band-like member such as a canvas, or a rubberized cloth.

Vibration isolating device 3 configured integrally as described above
is fixedly attached to the connection between the crankcase 1 and the oil pan 2 using a tightening fixture such as a bolt.

That is, the mounting method is, for example, as shown in FIG. 3B, using a hexagonal hole in which a mounting hole 6a is provided in a part of the elastic body 6, and the metal plate 4 on the crankcase 1 side is inserted into the mounting hole 6a. It is fixedly attached to the lower end surface 1a of the crankcase 1 using bolts 9.

Further, the upper end edge 2a of the oil pan 2 and the metal plate 5 on the side of the oil pan 2 are fixedly attached with a washer 11 and a bolt 10.

It should be noted that the method of fixing the vibration isolating device 3 is not limited to the above, and it goes without saying that the method of fixing does not imply any structural limitations of the present invention.

In addition, when an oil seal is required at the interconnection part like the crankcase 1 and oil pan 2 of this embodiment, the metal plates 4 and 5 and the respective crankcases of the metal plates 4 and 5 are attached as shown in the figure. 1. A frame-shaped sealing member 12.13 made of rubber or synthetic resin is vulcanized and fixed in advance to the surface on the oil pan 2 side, and the metal plates 4 and 5 are attached to the sealing member 12.13, respectively.
It is fixedly attached to the crankcase 1 and oil pan 2 via.

With this configuration, when the vibration isolation device 3 is installed, there is no need to insert a sealing member such as a gasket at the contact portion between the metal plates 4, 5, the crankcase 1, and the oil pan 2, and the installation work is simplified. It is advantageous.

The sealing member 12.13 may be provided with protrusions 22a, 23a on the contact surfaces on the crankcase 1 and oil pan 2 sides, as shown in FIG. 4, 22.23.

In this case, the surface pressure on the protrusions 22 a and 23 a is increased, and the function of preventing oil leakage can be better exhibited.

According to this embodiment device, since the elastic body 6 is used in a state that is not excessively compressed or tensile, its spring constant does not become large enough to reduce the vibration isolation effect, and the crankcase The vibration isolation effect transmitted from 1 to the oil pan 2 is increased.

Further, two metal plates 4, 5 and an elastic body 6 were vulcanized and fixed, and the metal plates 4, 5 were fixed in advance between the metal plates 4, 5 and the mating crankcase 1 and oil pan 2. Since the connecting portion between the crankcase 1 and the oil pan 2 is sealed by interposing the seal members 12, 13 or 22, 23, a sufficient oil sealing effect can be obtained.

In the elastic body 6 without support, excessive repeated loads in the vertical direction, particularly in the tensile direction, may cause fatigue due to vertical vibration of the oil pan 2 or impact loads during extreme operation. , become plastic.

Therefore, the vibration isolation effect of the elastic body 6 is reduced, and there is a risk of damage. However, in this embodiment, since the support 7 with high rigidity is provided only in the tensile direction, the elastic body 6 may not be excessively affected. Since tensile stress can be avoided, the above-mentioned problems such as damage to the elastic body 6 will not occur.

Furthermore, vibration energy in the horizontal direction and in the direction of compression of the elastic body is less likely to be transmitted to the oil pan 2 through the support 7.

Furthermore, since the device of this embodiment can be manufactured separately at another location, it is advantageous in terms of installation work.

The present invention is based on the above-mentioned crankcase 1 and oil pan 2.
It is not limited to the interconnection parts of the
It can be similarly applied between objects.

As described above, the present invention connects two vibrating objects with an elastic body that is not in an excessively compressed or tensile state when in a stationary state, so the vibration isolation effect of the elastic body can be increased, and the vibration isolation effect between the two objects can be increased. It is possible to effectively block vibrations and prevent noise generated by the vibrations.

Furthermore, the support can hold the elastic body within the elastic region, making it possible to effectively plasticize the elastic body and prevent tensile damage.

Furthermore, the vibration isolating device according to the present invention is constructed integrally before being installed between two objects, and the elastic body can be set in advance in a state where it is not subjected to excessive compression or tensile force by the support, so it is easy to assemble and easy to set. The load is accurate.

The present invention is particularly effective in isolating vibrations at the mutual contact area between the crankcase and oil pan of an engine such as an automobile, and can be highly effective in reducing engine noise.

Furthermore, since it has a simple structure, it can be easily replaced with the one currently in use.

[Brief explanation of the drawing]

Fig. 1 is a side view of the engine body to which the device of this embodiment is applied, Fig. 2 is an enlarged view of the X portion of Fig. 1 explaining the device of this embodiment, and Fig. 3A is a side view of the engine body to which the device of this embodiment is applied. A sectional view, FIG. 3B is a BB sectional view of FIG. 2, and FIG. 4 is a longitudinal sectional view of another embodiment of the sealing member. 1... Crank case, 2... Oil pan, 3... Vibration isolation device, 4, 5...
・Metal plate, 6...Elastic body, 7...Support.

Claims (5)

[Scope of utility model registration request] (1) In a vibration isolating device installed at an interconnection between two vibrating objects, an elastic body is sandwiched and fixed between at least two rigid plate-like members, while the The plate-shaped member is integrally constituted by connecting the elastic body through a plurality of supports having high rigidity only in the tensile direction while holding the elastic body in a state where it is not subjected to excessive compression or tensile force, and the plate-shaped member is A vibration isolating device characterized in that members are respectively fixed to two objects. (2) The vibration isolation device according to claim 1, wherein the means for fixing the elastic body and the two plate-like members is vulcanization adhesive. (3) The vibration isolation device according to claim 1 or 2, wherein the elastic body is made of rubber or synthetic resin. (4) The vibration isolating device according to any one of claims 1 to 3, wherein the plate-like member is a metal plate. (5) Utility model registration claim 1, characterized in that the 2VO body that accompanies vibration is a crankcase and an oil pan.
The vibration isolating device according to any one of items 1 to 4.