JPS59151645A - Hydrodynamic engine mount - Google Patents

Abstract

PURPOSE:To improve the vibro-isolating characteristic of secondary vibration in a hydrodynamic engine mount, by supporting a disclike rotor, which is made up of a way forming a fin or an orifice on a peripheral edge, transversely and vibratile-rotatably inside a fluid chamber. CONSTITUTION:A rotor 50 is made up of a disclike weight 51 and a fin 52 formed radially on a peripheral edge of this weight, while this rotor 51 is supported vibratile-rotatably by means of a torsion rod 16. When a more lower frequency vibration than that of resonance frequency in a resonant system consisting of the inertial mass of a rotating direction of those of share spring rubber 30, the torsion rod 16 and the rotor 50 is inputted into a setting member 20, a rotating vibration of the rotor 50 is more advanced in its phase than the inputted vibration whereby a pressure variation inside the fluid chamber 2 is made to be smaller. Therefore, the vibration transmission to the base member 10 from the setting member 20 decreases so that the vibro-isolating characteristic of secondary vibration in a hydrodynamic engine mount 1 is thus improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a fluid-filled engine mount, and more particularly to a fluid-filled engine mount with improved secondary vibration isolation characteristics.

A mounting member connected to the engine and a base member for mounting the engine are connected to the vehicle body frame by an elastic member that can be elastically deformed by transmission of vibration to form a chamber therein. Fluid-filled engine mounts, which are made by sealing fluid such as gas, are already known.Furthermore, a fluid-filled engine mount is provided in which a diaphragm is attached to the base member, and the fluid chamber and the diaphragm chamber are communicated only through an orifice. Mounts are also already known.

Although such fluid-filled engine mounts have excellent isolation characteristics over the entire range of vibrations, there is a problem in that they have lower isolation characteristics for secondary vibrations than engine mounts made of a single rubber material.

The present invention has been made in view of the above, and an object of the present invention is to provide a fluid-filled engine mount that can improve secondary vibration isolation characteristics.

In order to achieve such an object, the present invention provides a rotor having a disc shape and having fins or orifices formed entirely on the outer periphery thereof, which is supported in the fluid chamber so as to be able to rotate and vibrate transversely. It is said that

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a central vertical sectional view of a fluid-filled engine mount according to a first embodiment, and FIG. 2 is an enlarged perspective view of a rotor forming the main part.

The main body of the fluid-filled engine mount 10 includes a base member 10 that is fixed to the vehicle body frame, a mounting member 20 that is connected to the engine, and an umbrella-shaped elastic member 30 that connects the pace member 10 and the mounting member 20. In other words, a diaphragm 40 is attached to the pace member 10.

That is, the pace member 10 is formed by forming a mounting piece 12 at a suitable location on the outer periphery of a cylindrical body 11, and the mounting piece 12 is provided with a mounting hole (not shown) for attaching to the vehicle body frame. The outer periphery of the lower part of the umbrella-shaped shear spring rubber that is tied with the elastic member 30 is baked on the upper part of the cylindrical body 11 of No. is cylinder 1
1, and an engine mounting delt (not shown) is fixed to the center of the mounting member 20 and protrudes upward.

Further, the outer periphery of a diaphragm 40 is baked into the lower part of the cylindrical body 11 constituting the pace member 10.

In this embodiment, the bracket 15 is placed horizontally on the inner periphery of the lower part of the cylindrical body 11 of the base member 100, and the bracket 15 is fully extended to the center of the cylindrical body 11. A torsion rod 16 is installed with a nut 17 concentrically with the cylindrical body 11.

A disk-shaped rotor 50 is supported at the upper end of the torsion rod 16 at the center thereof while maintaining a horizontal state.

The rotor 50 consists of a disc-shaped weight 51 and fins 52 formed radially on the outer periphery of the weight 51.
A gap C is formed between the outer periphery of the cylinders 2 and the inner periphery of the cylindrical body 11.

The rotor 50 is thus supported by the torsion rod 16 so as to be able to vibrate multiple times, and the fluid engine engine mount 1 is defined by the rotor 50 into the fluid chamber 2 above and into the diaphragm chamber 41 below. The fluid chamber 2 and the diaphragm chamber 41 are connected to the fins 52 of the rotor 50.
... and the outer periphery thereof and the inner periphery of the cylindrical body 11 are communicated through a gap 0=i formed therebetween.

The fluid chamber 2 and diaphragm chamber 41 of the fluid-filled engine mount 1 configured as described above are filled and sealed with a fluid such as liquid or gas, and are brought into a multi-free state.
The mounting member 20 faces above the cylindrical body 11.

Next, the fluid-filled dienless mount 10 configured as above
Describe the action.

Since the front rotor 50 is supported by the torsion rod 16, it is fixed in the direction of the support shaft and is supported by a spring in the direction of rotation. Therefore, the rotor 50 is supported by the torsion rod 16 so as to be able to vibrate multiple times.

When the rotor 50 rotates and vibrates, the fins 52...
- Fluid moves alternately in the upper and lower chambers 2 and 41 through the gap. This movement of fluid causes pressure fluctuations within the fluid chamber 2, causing the shear spring rubber 30 to swell or deflate. At this time, a repulsive force is generated in the shear spring rubber 30, and this repulsive force prevents the movement of the multi-fluid between the fins 52, and acts like a kind of spring against the rotation of the rotor 50.

Therefore, there is a resonant system consisting of the spring component due to the repulsive force of the shear spring rubber 30, the sum of the torsion/knead of the torsion rod 16 forming the rotor support, and the inertial mass of the rotor 50 in the rotational direction.

When a vibration of a frequency lower than the resonant frequency fr of the above-mentioned resonant system, that is, the resonant system consisting of the shear spring rubber 30, the torsion rod 16, and the inertia mass in the rotational direction of the rotor 50, is manually applied to the mounting member 20, the rotor 50 Since the rotational vibration is more advanced in phase than the input vibration, the rotor 50 acts like a so-called pump to suppress pressure fluctuations in the fluid chamber 2. Therefore, the pressure fluctuations in the fluid chamber 2 are reduced and the As a result, vibration transmission from the attachment member 20 to the pace member 10 is reduced.

Therefore, according to the fluid-filled engine mount 1 according to the present invention, improvement in the isolation characteristics of secondary vibrations can be effectively achieved.

This can be expressed as a frequency-dynamic magnification characteristic diagram as shown in FIG.

In FIG. 4, the solid line shows the characteristics of the fluid-filled engine mount of the present invention, and the broken line shows the characteristics of the conventional type.

In the first embodiment described above, the rotor is integrally supported with the rotor head/yeon rod, but the same function and effect can be obtained by configuring it as shown in FIG. 3.

In FIG. 3, since the basic structure of the fluid-filled engine mount 101 is the same as that described above, the same members are numbered in the 100 series and given the same reference numerals to avoid duplication of explanation.

In the second embodiment, a cylindrical body 1 is attached to the tip of a bracket 115 installed horizontally within a cylindrical body 111 constituting a base member 110.
A normal rod 116 is set up concentrically with the rod 117 using a NAND 117, and a nut 118 is attached to the rod 116 with a rotor 150 rotatably and vertically slidable at the upper end of the rod 116, keeping the rod 116 in a horizontal state. The rotor 150 is supported by fastening from above.

Furthermore, a small cylinder 119 is provided concentrically with the rod 111 at the tip of the bracket 115, and a small cylinder 159 is also formed concentrically and hanging down from the lower surface of the rotor 150.
The small cylinder 15 of the rotor 150 is attached to the outer periphery of the small cylinder 119 of the rotor 150.
9 is fitted tightly and slidably and loosely. At this time, relatively high pressure gas is sealed in the chamber 160 formed in the cylinders 119 and 159.

Since it is supported in the direction of the support shaft by the gas chamber 160, the support in the direction of the support shaft is relatively high.

Therefore, according to this embodiment, the shear spring comb 13
0 repulsive force, the inertial mass of the rotor 150 in the rotational direction, and the gas chamber 160 forming the rotor support part.
There is a resonant system due to the gune component.

In each of the embodiments, fins are formed on the outer peripheral edge of the rotor, but the same effects can be obtained by using orifices instead.

As is clear from the above description, according to the present invention, the rotor, which is disc-shaped and has fins or orifices formed on its outer periphery, is supported transversely within the fluid chamber and rotatably vibrated. A rotor inside the room? By acting like a pump, it is possible to improve the secondary vibration isolation characteristics of the fluid-filled engine mount.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, and FIG. 1 is a central vertical sectional view of a fluid-filled engine mount showing the first embodiment, FIG. 2 is an enlarged perspective view of a rotor forming the main part, and FIG. This figure is similar to FIG. 1 showing the second embodiment, and FIG. 4 is a frequency-dynamic magnification characteristic diagram. In the drawing, 1 is a fluid-filled engine mount, 2.41 is a fluid chamber, 10 is a base member, 20 is a mounting member, 30 is an elastic member, 40 is a diaphragm, 50 is a rotor, and 52 is a fin. Patent applicant: Honda Motor Co., Ltd. agent Patent attorney 2) 1) Japan patent attorney Kuni Ohashi Otoma Patent attorney Yu Koyama

Claims (1)

[Claims] A mounting member that is connected to the engine and a base member that mounts the engine are connected by an elastic member that can be elastically deformed by transmitting vibrations to form a chamber therein, and a fluid is sealed in the chamber. A fluid-filled engine mount, characterized in that a disc-shaped rotor having fins or orifices formed on its outer periphery is supported in a fluid chamber so as to be able to rotate and vibrate transversely.