JPH0241383Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vibration-isolating support device, particularly to a vibration-isolating support device suitable for vibration-isolating support of an internal combustion engine.

Conventional vibration isolating support devices of this type are shown in Figures 1 and 2.
As shown in the figure, a vibration isolating rubber c is interposed between an upper metal fitting a fixed to a vibration-isolated device such as an internal combustion engine and a lower metal fitting b fixed to a stationary object such as a base. A first viscous fluid chamber d whose internal volume changes with vibration is communicated with a second viscous fluid chamber f via an orifice e, and the vibration energy of the vibration-isolated device is passed through the vibration-isolating rubber c and the orifice e. The liquid is absorbed by the viscous resistance of the viscous fluid. However, none of these devices has any stopper function against shocking vibrations, and even if it is desired to reduce the spring constant by making the anti-vibration rubber c smaller in order to cope with this problem, the amount of deformation is still tolerable. There was a problem where the value could not be lowered because it exceeded the value.

The present invention was proposed in order to deal with the above-mentioned problems, and its gist is that between the upper metal fitting fixed to the vibration-isolated equipment such as the internal combustion engine and the lower metal fitting fixed to the stationary object. A vibration isolating support device in which a vibration isolating rubber is interposed between the vibration isolating support device, which is attached to either the upper metal fitting or the lower metal fitting so as to be vertically adjustable, and regulates the amount of relative movement between the upper metal fitting and the lower metal fitting. a stopper, and a first member whose internal volume is changed as the stopper moves.
A vibration isolating support device comprising: a viscous fluid chamber; and a second viscous fluid chamber communicating with the viscous fluid chamber through an orifice.

Since the present invention has the above-mentioned configuration, the vibration of the equipment to be vibration-isolated is suppressed by the vibration-isolating rubber and the viscous fluid passing through the orifice interposed between the first viscous fluid chamber and the second viscous fluid chamber. Can be absorbed by viscous resistance. Shock vibrations can be controlled by a stopper that is fixed to either the upper metal fitting or the lower metal fitting and regulates the amount of relative movement between the upper metal fitting and the lower metal fitting, so the spring constant of the anti-vibration rubber is optimized for vibration isolation. It can be set to any value.

Hereinafter, the present invention will be specifically explained with reference to an embodiment shown in FIG.

In FIG. 3, reference numeral 1 designates a bracket for a device to be vibration-isolated such as an internal combustion engine, which is composed of a bracket main body 1a and a cushioning rubber 1b baked onto its lower surface. 2 is the base as a stationary object, 3 is the bracket body 1a
4 is an upper metal fitting fixed to the base 2 with a bolt 9; 4 is a lower metal fitting fixed to the base 2 with a bolt 10;
8 is a partition plate, and 6 is a stopper, which is inserted through the center of the lower metal fitting 4 and the partition plate 8. The threaded end portion 6a is screwed into the screw hole 1c of the bracket body 1a and fixed. A fixing bolt 7 is inserted into the hole 6b of the stopper 6, and its lower end threaded portion 7a is screwed into the threaded hole 2a of the base 2 and fixed. Partition plate 8
is held between the lower surface of the bracket main body 1a and the upper surface of the upper metal fitting 3 at its peripheral edge, and the bolt 9
Fixed by A cap nut 11 is screwed into the threaded portion 6a of the stopper 6. 12 is a sealing cap, 13, 14, 1
5 and 16 are O-rings. 17 is a first viscous fluid chamber defined by the lower surface of the partition plate 8, the inner surface of the upper metal fitting 3, the inner surface of the vibration isolating rubber 5, the upper surface of the lower metal fitting 4 and the outer peripheral surface of the stopper 6, and 18 is the lower metal fitting. 4, the outer circumferential surface of the buffer rubber 6c baked on the outer circumferential surface of the stopper 6, the upper surface of the base 2, and the fixing bolt 7.
19 is a third viscous fluid chamber defined by the inner circumferential surface of the stopper 6 and the outer circumferential surface of the fixing bolt 7;
A fourth viscous fluid chamber 20 is defined by the upper surface of the partition plate 8, the outer peripheral surface of the stopper 6, and the lower surface of the buffer rubber 1b. Each of 20 is filled with a highly viscous fluid such as silicone oil. The first viscous fluid chamber 17 and the second viscous fluid chamber 18 communicate with each other via a first orifice 21 formed by a minute gap between the inner surface of the lower metal fitting 4 and the buffer rubber 6c. Viscous fluid chamber 18 and third viscous fluid chamber 1
9 is communicated with the third viscous fluid chamber 19 through a second orifice 22 formed by a minute gap between the inner circumferential surface of the stopper 6 and the outer circumferential surface of the fixing bolt 7.
and the fourth viscous fluid chamber 20 are communicated via a third orifice 23 formed by a radial hole drilled in the stopper 6. These first to third orifices 21, 22, and 23 are configured such that their flow passage areas become smaller in this order.

Therefore, when a vibration-isolated device such as an internal combustion engine vibrates, the vibration is transmitted to the vibration-isolating rubber 5 through the upper metal fitting 3 fixed to the vibration-isolating device, and is buffered by the vibration-isolating rubber 5. At the same time, the vibrational displacement displaces the upper metal fitting 3, stopper 6, and partition plate 8 fixed to the bracket main body 1a, and changes the internal volumes of the first to fourth viscous fluid chambers 17, 18, 19, and 20. First, the vibration displacement is applied to the first viscous fluid chamber 1.
A vibration damping force is generated due to viscous resistance when the viscous fluid in 7 passes through the first orifice 21 to the second viscous fluid chamber 18 , and similarly, the vibration damping force is generated from the second viscous fluid chamber 18 to the second orifice 22 . Passing through the third
In the process of passing from the third viscous fluid chamber 19 through the third orifice 23 to the fourth viscous fluid chamber 20, a vibration damping force corresponding to the viscous resistance is generated. Thus,
Depending on the magnitude of the vibration amplitude, one of the first to third orifices 21, 22, and 23 responds, and large amplitude vibrations in the low frequency range are handled by the first orifice 21 with a large flow path area. The small amplitude vibration in the high frequency range is mainly damped by the third orifice 23 having a small flow path area.

In addition, the impact vibration causes the shock absorbing rubber 6c on the lower surface of the stopper 6 to collide with the upper surface of the base 2, thereby restricting the amount of relative movement between the upper metal fitting 3 and the lower metal fitting 4.

Further, the buffer rubbers 1b and 6c can increase the width of the viscous fluid passing through the orifice, and can also reduce the impact of temporary sudden impact forces.

Thus, in the above device, the impact force acting on the fixture 3 can be regulated by the stopper 6, and therefore the spring constant of the vibration isolating rubber 5 can be set small. In addition, the buffer rubber 6c of the stopper 6
can not only alleviate the impact force but also increase the amplitude of the viscous fluid passing through the orifice.

Further, the amount of viscous fluid can be easily inspected and replenished by simply removing the cap nut 11, and the temperature increase due to the viscous resistance of the viscous fluid can be radiated from the cap nut. Furthermore, the device is compact, and its internal space can be effectively utilized to form four viscous fluid chambers, and each member is easy to assemble, allowing each member to perform multiple functions. One viscous fluid chamber and three orifices can be formed without requiring any special members.

In the above embodiment, the stopper is fixed to the upper metal fitting, but it may also be fixed to the lower metal fitting to restrict the amount of relative movement between the upper metal fitting and the lower metal fitting. Further, although the above embodiment has four viscous fluid chambers, five or more viscous fluid chambers may be formed, but at least one viscous fluid chamber whose internal volume can be changed as the stopper moves. 2 of the second viscous fluid chamber communicated with through an orifice.
One is necessary.

Although the present invention has been described above with reference to embodiments, the present invention is not limited to such embodiments, but can be modified in various ways without departing from the spirit of the present invention.

[Brief explanation of the drawing]

FIGS. 1 and 2 are longitudinal sectional views showing a conventional anti-vibration support device, respectively, and FIG. 3 is a longitudinal sectional view showing one embodiment of the present invention. Vibration-isolated equipment...1, Upper bracket...3, Stationary object...2, Lower bracket...4, Vibration-isolating rubber...5, Stopper...6, First viscous fluid chamber...17, Orifice... ...21, second viscous fluid chamber...18.

Claims (1)

[Scope of utility model registration request] In a vibration isolating support device in which a vibration isolating rubber is interposed between an upper metal fitting fixed to a vibration-isolated device such as an internal combustion engine and a lower metal fitting fixed to a stationary object, the upper metal fitting or the lower metal fitting a stopper that is attached to one of the upper and lower metal fittings so as to be vertically adjustable; and a first viscous fluid chamber whose internal volume is changed as the stopper moves. A vibration isolating support device comprising: a second viscous fluid chamber communicating with the viscous fluid chamber through an orifice.