JPS5940592Y2 - Anti-vibration support - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a resilient support such as an engine mount.

In the well-known anti-vibration support for supporting an engine in which a rubber block is interposed between two mounting brackets, the loss coefficient of the rubber is small, so the damping coefficient is small, and the engine shakes violently when idling etc., resulting in damping. It was desired to increase the coefficient.

To achieve this objective, a vibration-proof support as shown in FIG. 1 was proposed.

This anti-vibration support consists of a thick cylindrical body 1 made of an elastic material such as rubber.
A mounting bracket 2 is provided on one end side and is closed.
On the other end side, a mounting bracket 3 having a small hole A in the center and an L-shaped flange part F on the outer periphery is provided to close the main sealed chamber A and connect it to this main sealed chamber A. , a side sealed chamber B is formed by providing an enclosure 4 having a thin sheet-like opening in at least a part of an elastic body such as rubber in the L-shaped flange f of the mounting bracket 3, and a main sealed chamber A. Both sub-sealed chambers B are filled with liquid.

In the figure, reference numerals 5 and 6 indicate bolts that are installed in the mounting bracket 2 or 3, and are for mounting on the vehicle body side or the engine part (not shown).

Reference numeral 7 denotes a non-expandable band, which extends around the outer periphery of the cylinder 1 and is used to suppress outward deformation when the cylinder 1 is compressed in the axial direction.

When an excitation vibration in the P direction is applied to the vibration isolating support having the above structure, the volume of the main girder closed chamber A will be reduced, and as a result, the liquid sealed in the closed chamber A will flow through the small hole of the mounting bracket 3. The fluid is fed into the side sealed chamber B which is connected through the hole A, and the fluid resistance generated when it passes through the small hole A causes a large damping coefficient.

Therefore, in the above, the reduction in the volume of the main sealed chamber A is:
This is compensated by the expansion of the volume of the side sealed chamber B (indicated by the dotted line), and for this purpose, at least a part of the enclosure 4 made of an elastic material such as rubber forming the side sealed chamber B has a thin sheet-like opening. There is a need to.

Therefore, in this vibration-proof support, the liquid filled and sealed in the main sealed chamber A and the side sealed chamber B easily permeates through the opening of the thin sheet-like part of the enclosure 4, and as a result, the liquid gradually decreases and damps. It has drawbacks that reduce performance.

The present invention was developed in view of the above points, and its gist is that a mounting bracket is attached to one end of a thick-walled cylinder made of an elastic material such as rubber, and a mounting bracket is provided to the other end of the thick-walled cylinder. A cap-shaped mounting bracket is attached to form the entire sealed chamber, and a partition wall having a small hole is installed between the cylindrical body and the cap-shaped mounting bracket to connect the sealed chamber to the main sealed chamber on the cylindrical body side. The assistant referee's closed room is divided between the fittings, and a wire mesh is provided inside the cap-shaped mounting fittings so as to cover the small holes in the partition wall.
An air chamber is provided in the sealed chamber near the top of the cap-shaped mounting fitting, and the other main sealed chamber and sub-sealed chamber are filled with liquid.

Next, this will be explained according to the drawings.

In FIG. 2, 10 is a thick-walled cylinder made of an elastic material such as rubber.

11 is a mounting bracket attached to one end (lower side) of the cylinder;
Reference numeral 12 denotes a cap-shaped fitting that is attached to the other end (upper side) of the cylindrical body and protrudes outward, and is formed as a whole as a sealed chamber.

The cap-shaped mounting bracket 12 may be mounted by gluing a ring-shaped plate 13 having bolt holes (not shown) to the end face of the cylinder 10, for example, as shown in the figure. A flange portion f extending outward is provided, a through hole (not shown) is provided in the flange portion f at a position corresponding to the bolt hole provided in the plate 13, and the surface of the flange portion f of the cap-shaped mounting bracket 12 is This is accomplished by bringing the plates 13 into contact and screwing the bolts 14 on.

Reference numeral 15 denotes a partition wall, which is installed between the cylindrical body 10 and the cap-shaped mounting bracket 12, and is used to connect the cylindrical body 1 to the closed chamber formed by the cylindrical body 11° and the cap-shaped mounting bracket 12. It is divided into a main closed room C and a closed assistant referee's room on the side of the cap-shaped mounting bracket 12.

C is a small hole provided in the partition wall 15.

When the partition wall 15 is installed to form the main sealed chamber C1 and the sub-sealed chamber between the cylindrical body 10 and the cap-shaped fitting 12, for example, the flange part f of the cap-shaped fitting 12,
and an annular groove 16 is bored at each inner peripheral surface position of a ring-shaped plate 13 provided for attaching a cap-shaped mounting fitting 12 to the end face of the cylindrical body 10, and an O-ring 17 is fitted into the groove 16, The O-ring 17 is installed in the groove 16 so as to press against the end face of the partition wall 15.

Reference numeral 18 is a wire mesh, which is provided within the cap-shaped fitting 12 so as to cover the small hole C of the partition wall 15.

In the figure, the wire mesh 18 is formed in the shape of an overturned bowl, and is mounted by inserting its outer peripheral end into a small groove 19 bored in the inner peripheral surface of the flange portion f of the cap-shaped mounting fitting 12.

20 is a band provided on the outer periphery of the cylindrical body to prevent outward expansion; 21 is a mounting bolt, which is a mounting bracket 11. It is provided on the cap-shaped mounting fitting 12 and is used to mount the present vibration-proof support on the engine side or the vehicle body side.

Therefore, at the bottom of the tank, an air chamber E is provided in the sealed chamber near the top of the cap-shaped mounting bracket 12, and other than this air chamber E, the main sealed chamber C and the secondary closed chamber The chamber is filled with liquid.

The reason why this air chamber E is provided is that when the vibration isolating support is subjected to excitation vibration in the P direction, the volume of the main sealed chamber C is reduced, and the liquid to be sealed flows through the small holes provided in the partition wall 15. However, since the member forming the sealed chamber is a metal cap-shaped fitting 12 that does not expand or contract, the liquid will not fill up in the assistant referee's closed chamber. In this case, since it becomes impossible to move, a part of the closed area of the assistant referee's room, that is, a part near the top of the cap-shaped mounting bracket 12, is placed in the air chamber E.
This is to compensate for the movement from the main sealed chamber C through the small hole C provided in the partition wall 15 during excitation vibration, and thus to exhibit damping ability.

In the above, during the excitation vibration, the liquid moves from the main sealed chamber C to the assistant referee's closed room through the small hole C provided in the partition wall 15 with a furious force like a fountain, and the assistant referee When the air chamber E provided in a part of the closed room is disturbed and a part of the disturbed air enters the main sealed room C, the pressure in the main sealed room C increases due to the compressibility of the air. The damping capacity will be significantly reduced.

In order to prevent this, if a wire mesh 18 is provided in the cap-shaped mounting bracket 12 that forms the assistant referee's closed room so as to cover the small hole C provided in the partition wall 15, the main closed room C can be accessed from the partition wall during excitation vibration. The fountain-like liquid flowing through the small hole C formed in the small hole C forms a liquid film at 18 locations on the wire mesh covering the small hole C, and does not disturb the air in the air chamber E, thus achieving the required attenuation. ability is obtained.

As mentioned above, in the present invention, instead of using a thin sheet of elastic material such as rubber through which the liquid to be sealed is used to form the assistant referee's closed room as in the past, it is made of metal, so there is a risk that the amount of liquid to be sealed will be reduced. In addition, an air chamber was installed in a part of the sub-sealed chamber, and a small air chamber was installed in the partition wall as a measure to cope with the reduction in volume of the main sealed chamber during excitation vibration due to the fact that the assistant referee's closed chamber was made into a rigid sealed chamber that does not expand or contract. This invention provides an extremely practical and valuable idea in which the hole is covered with a wire mesh to prevent the reduction in damping ability due to the provision of an air chamber.

In the above, the holes in the partition wall through which the liquid flows are collectively referred to as small holes, but various modifications are included in which the liquid flows and damping ability is obtained by the flow resistance.

Additionally, a cap-shaped mounting bracket 12 is provided to cover the small hole C of the partition wall 15.
In the above, the internally provided members are all made of wire mesh, but a net-like material made by weaving fiber cords in a mesh pattern can also have the same effect.

[Brief explanation of drawings]

FIG. 1 is a sectional view illustrating a conventional example, and FIG. 2 is a sectional view illustrating the present invention. 1...Cylinder body, 2...Mounting bracket, A...
...Small hole, 3...Mounting bracket, f...
・Flange part, A... Main sealed chamber, 4...
・Enclosure, opening...thin sheet-like part, B...
...Sub-sealed chamber, 5, 6...Bolt, 7...
...Band, 10...Cylinder, 11...
Mounting bracket, 12... Cap-shaped mounting bracket, 13
...Plate, 14 ...Bolt, 15
...Partition wall, C...Main closed room, D...
...Sub-sealed chamber, C...Small hole, 16...
...Groove, 17...O-ring, 18...
- Wire mesh, 19...Groove, 20...Band, 21...Mounting bolt, E...Air chamber.

Claims (1)

[Scope of utility model registration request] A mounting bracket is attached to one end of a thick-walled cylinder made of an elastic material such as rubber, and a cap-shaped mounting bracket that protrudes outward is attached to the other end to form the whole as a sealed chamber, with a partition wall having small holes. is installed between the cylindrical body and the cap-shaped mounting bracket to divide the sealed chamber into a main sealed chamber on the cylindrical body side and a side sealed chamber on the cap-shaped mounting bracket side, and a cap-shaped wire mesh is installed so as to cover the small hole in the partition wall. An air chamber is provided in the sealed chamber near the top of the cap-shaped mounting bracket, and the other main sealed chamber and side sealed chamber are filled with liquid. Features anti-vibration support.