JPS634051B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fluid-filled engine mount arrangement.

As a conventional fluid-filled engine mount device, there is one shown in FIG. 1, for example. That is, the substrate 1 coupled to the power unit side,
A cylindrical mount rubber 4 having a gap 3 inside is inserted and fixed between a substrate 2 that is coupled to the side of the vehicle body frame, etc., and an orifice 5 is installed on the top surface of the substrate 1.
A flat partition plate 6 is installed, and a fluid chamber 7 is formed below the partition plate 6. A diaphragm 8 is attached to the upper side of the partition plate 6, and a secondary chamber 9 is formed between the partition plate 6 and the diaphragm 8 has been formed.

Reference numeral 10 denotes a cover, and the periphery of the diaphragm 8 and the partition plate 6 are fixed to the substrate 1 by caulking the periphery of the cover. 10a is a ventilation hole of the cover 10. Reference numeral 11 denotes an embedded ring, which prevents the mount rubber 4 from expanding in diameter. Also, 12
is a bolt for fixing the board 2 to the vehicle body frame, etc., and has a hole 12a for filling fluid in the center;
This hole 12a is closed by a screw 12b.
The fluid chamber 7 and the auxiliary chamber 9 are filled with fluid, and both chambers 7 and 9 communicate with each other via an orifice 5.

When the length dimension between the two substrates 1 and 2 changes due to a load such as bounce of the vehicle body, the mount rubber 4 expands and contracts in the vertical direction. As a result, the volume of the fluid chamber 7 changes, and fluid reciprocates between the fluid chamber 7 and the subchamber 9. Since the fluid reciprocates through the orifice 5, the load is damped when the fluid passes through the orifice 5. As the fluid moves, the diaphragm 8 expands as shown by the chain line, so the cover 10 protrudes upward to accommodate this expansion, and allows air to enter and exit the cover 10 through the ventilation holes 10a. .

However, according to such a conventional fluid-filled engine mount device, since the partition plate 6 has a flat plate shape, the diaphragm 8 has a shape that projects outward, and therefore the cover 10 projects further outward. It had become a structure. Therefore, not only does the space required for the engine mount become large, but also interference with the power unit and auxiliary equipment must be avoided, making it difficult to arrange the engine mount device at a suitable position. Furthermore, since the subchamber 9 is located outside the gap 3 of the mount rubber 4, filling the engine mount device with the fluid can be done by immersing the entire engine mount device in the fluid, or by opening the filling hole 12a as shown in the figure. There are some inconveniences that must be taken care of. Furthermore, when the diaphragm 8 expands significantly upward,
Since the joint between the partition plate 6 and the diaphragm 8 becomes loose, there is a possibility that fluid may leak therefrom.

The present invention was made by focusing on such conventional problems, and the partition plate and the diaphragm are mounted so as to protrude into the gap in the mount rubber, and the cover By configuring the diaphragm to serve as a supporting wall so that it does not bulge outward from the plane where the diaphragm is crimped and fixed between the board connected to the power unit side, The purpose is to solve the above-mentioned problems.

Hereinafter, the present invention will be explained based on the drawings.

FIG. 2 is a diagram showing an embodiment of the present invention.
First, the structure will be explained. Reference numerals 1 and 2 are boards. The board 1 is connected to a power unit including an engine, and the board 2 is connected to a vehicle body frame. A cylindrical mount rubber 4 having a void 3 inside is inserted and fixed between both substrates 1 and 2, and an embedded ring is provided in this mount rubber 4 to prevent the mount rubber 4 from expanding in diameter. 11 is fixed.

Reference numeral 6 denotes a partition plate, which is formed to have a convex cross section by connecting a peripheral plane part 6a and a central plane part 6b by a trapezoidal part 6c, and an orifice 5 is bored in the central plane part 6b. be. This partition plate 6
The peripheral plane part 6a is overlapped with the upper surface of the substrate 1, and the central plane part 6b is overlapped with the gap 3 of the mount rubber 4.
The partition plate 6 of the gap 3 is
The lower part is defined as a fluid chamber 7.

8 is a diaphragm, which connects a peripheral plane part 8a and a central protruding part 8b by a bellows part 8c,
It is shaped to have a convex cross section. The peripheral flat part 8a of this diaphragm 8 is overlapped with the upper surface of the peripheral flat part 6a of the partition plate 6, and the central protruding part 8b
is installed by extending it into the gap 3 of the mount rubber 4, and then the partition plate 6 and the diaphragm 8 in the gap 3 are attached.
A subchamber 9 is formed between the two. In this way, a fluid chamber 7 and a sub-chamber 9 are formed in the gap 3 of the mount rubber 4 and communicated through the orifice 5, and both chambers 7 and 9 are filled with fluid. A liquid is normally used as the fluid.

The upper surface of the diaphragm 8 has a peripheral flat portion 8.
A cover 10 is disposed between the substrate 1 and the peripheral plane portion 6a of the partition plate 6, and the peripheral edge of the cover 10 is caulked and fixed to the peripheral edge of the substrate 1.
The cover 10 has a flat top surface as shown in the figure. An air chamber 13 is formed between the cover 10 and the diaphragm 8, and this air chamber 13 communicates with the atmosphere through the vent hole 10a of the cover 10.
Reference numeral 12 denotes a bolt for fixing the board 2 to a vehicle body frame or the like.

Next, the action will be explained.

When there is an input such as a bounce of the car body, boards 1 and 2
The distance between them changes, the mount rubber 4 expands and contracts, and the volume of the fluid chamber 7 changes. The embedded ring 11 prevents the mount rubber 4 from expanding to the outer periphery so that this volume change is proportional to the amount of expansion and contraction of the mount rubber 4. When the mount rubber 4 is compressed, the volume of the fluid chamber 7 is reduced, so that the fluid moves through the orifice 5 to the auxiliary chamber 9. Therefore, since the volume of the auxiliary chamber 9 is expanded, the bellows portion 8c of the diaphragm 8 contracts, and its central protrusion 8b moves toward the cover 10 side.

Furthermore, when the mount rubber 4 is expanded, the volume of the fluid chamber 7 is expanded, and the fluid pressure thereof is decreased, so that the fluid in the auxiliary chamber 9 moves to the fluid chamber 7 via the orifice 5. Then, since the volume of the subchamber 9 is reduced, the diaphragm 8 has a bellows portion 8c.
extends, and the central protruding portion 8b approaches the central plane portion 6b of the partition plate 6. In this way, the expansion and contraction of the mount rubber 4 due to vibration input causes movement of the fluid between the chambers 7 and 9, and when the fluid passes through the orifice 5 during this movement, the fluid is subjected to the orifice action, so that the vibration damping effect against the vibration input is generated. occurs and the vibration input is therefore damped.

When the volume of the auxiliary chamber 9 is expanded, the central protruding portion 8b of the diaphragm 8 approaches the cover 10 as described above, but even when it comes closest, it is at the height of the peripheral flat portion 8a of the diaphragm 8. . Therefore, the peripheral plane portion 8 of the diaphragm 8
Since there is no action to separate the diaphragm 8 from the peripheral flat part 6a of the partition plate 6, even when the mount rubber 4 is suddenly compressed, fluid will not leak from between the diaphragm 8 and the peripheral flat parts 8a, 6a of the partition plate 6. There's nothing to do.

Note that when assembling this engine mount device, the fluid is filled in advance by filling the fluid in the gap 3 of the mount rubber 4 at the stage where the board 2 with the bolt 12 and the board 1 are bonded together by means such as vulcanization. This can be done by placing the partition plate 6 and diaphragm 8 on top of it and allowing the excess fluid to overflow. Thereafter, the cover 10 is placed and its periphery is caulked as described above. In this way, the fluid can be filled even in air, and there is no need to provide an injection hole or the like in the bolt 12 or the like.

As described above, according to the present invention, the partition plate and the diaphragm of the fluid-filled engine mount device are mounted in a convex manner within the gap formed in the mount rubber, and the fluid chamber is Since the diaphragm and the sub-chamber are formed within the gap, the diaphragm does not protrude significantly outside the range defined by the mount rubber. Therefore, there is no need to mold accessory parts such as a cover into a convex shape, so the engine mount device can be made smaller, and as a result, there is less interference with the power unit and auxiliary equipment. It has the effect of being able to be placed in a suitable position for. In addition, the fluid chamber and the sub-chamber that are filled with fluid are both provided within the mount rubber gap, making it easy to fill the fluid in liquid or in air without using injection equipment. Can do filling work. Furthermore, since the cover serves as a support wall for the diaphragm, the diaphragm is no longer pulled toward its center even when the subchamber expands, so the pressure bonding force at the diaphragm mounting portion does not decrease. Therefore, it is possible to prevent fluid from leaking from the diaphragm attachment portion.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional example, and FIG. 2 is a sectional view showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1, 2... Substrate, 3... Gap, 4... Mount rubber, 5... Orifice, 6... Partition plate, 6a... Peripheral plane part, 6b... Central plane part, 6c... Trapezoidal part, 7... Fluid chamber, 8... Diaphragm, 8a...peripheral plane part, 8
b... Central protrusion, 8 c... Bellows section, 9... Sub-chamber, 1
0...Cover.

Claims (1)

[Claims] 1 A space is provided inside a mount rubber placed between a board to be coupled to the power unit side and a board to be coupled to the vehicle body frame, etc., and a partition with an orifice is provided in the board to be coupled to the power unit side. A fluid chamber is formed on one side of the partition plate by attaching a plate, and a diaphragm is stacked on the partition plate to form a sub-chamber partitioned by the diaphragm on the other side of the partition plate. , further placing a cover over the diaphragm,
The periphery of the diaphragm and the partition plate are bonded to a substrate to be coupled to the power unit side such that the diaphragm and the partition plate are crimped and clamped between the substrate to be coupled to the power unit side and the periphery of the cover. ,
A fluid-filled engine mount in which both chambers are filled with fluid, the partition plate is mounted so as to protrude convexly into the gap, and the diaphragm is also made to protrude convexly into the gap like the partition plate. In order to prevent the diaphragm from bulging outside the plane where the diaphragm is bonded to the substrate connected to the power unit side by pressure bonding, the cover is formed into a flat shape, A fluid-filled engine mount device configured as a support wall.