JPS59151638A - Hydrodynamic engine mount - Google Patents

Abstract

PURPOSE:To improve the high frequency vibro-isolating effect of an engine, by installing an inner capacity variable member, which seals gas inside a chamber and is retractable in a vibration transmission direction, in the fluid chamber of a hydrodynamic engine mount. CONSTITUTION:A fluid is filled up and sealed inside a chamber 2 made up of a base plate 11 and a cylindrical body 15 of a base member 10, share spring rubber 30 and a setting member 20, and furthermore an inner capacity variable member 40, which is retractable in a vibration transmission direction and seals gas inside, is set up inside the chamber 2. With this, an engine vibration is transmitted to the base member 10 via the gas sealed inside the chamber 2 but since the inner capacity variable member 40 varies its capacity according to high frequency vibration at a high speed range, transmission of the high frequency vibration to a car body can be sharply isolated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in single-fluid long engine mounts, and more particularly to a fluid-filled engine mount that can completely and effectively block transmission of high-frequency engine vibrations to a vehicle body.

A mounting member that is connected to the engine and a base part that is connected to the vehicle body frame and mounts the engine are connected by an elastic part that can be elastically deformed by transmitting vibrations to form a whole interior chamber. Fluid engines/mounts containing liquid are already known.

By the way, regarding such a fluid-filled engine mount,
The vibration of the engine is divided into a force Pr transmitted from the mounting member to the base member via the elastic member, and a force Fa transmitted to the base member via the liquid sealed inside the chamber, and these forces Fr and Fa. The sum F acts on the vehicle body frame.

Generally, the liquid in the chamber undergoes a pressure change Δp due to engine vibration, and this pressure change Δp acts uniformly on the entire liquid. Therefore, focusing on the vertical direction of vibration transmission, in order to find the force Fan' transmitted to the base member via the liquid, the effective cross-sectional area within the cylindrical portion of the base member that constitutes the bottom surface of the chamber, i Drn' (note) m is the diameter inside the cylindrical part) and the value using the effective cross section of the mounting member part that directly receives engine vibration from this effective cross section - (Di -De)
The difference between −De and the above pressure liquid 4
All you have to do is multiply it by Δpt. That is, πFa-7De2·Δp.

However, since this force Fa acts on the entire bottom surface of the chamber, conventional fluid-filled engine mounts cannot sufficiently isolate high-frequency vibrations in the engine's high-speed rotation range, and therefore it is difficult to improve this. desired.

The present invention has been made in response to the above-mentioned needs, and its object is to provide a fluid-filled engine mount that greatly improves the effect of blocking high-frequency engine vibrations.

In order to achieve such an object, the present invention has the following features in its first invention:
Either the mounting member or the base member vertically facing the mounting member is one.

The second aspect of the present invention is further characterized in that a variable internal volume member is installed on the inside of the room and is made of a gas-filled member and is expandable and contractible in the vibration transmission direction in the room.

A liquid is sealed together with a gas in the variable internal volume member, and the contractible limit of the variable internal volume member is set by the liquid.

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

FIG. 1 and FIG. 2 are central vertical sectional views of the fluid-filled engine mount force according to the first invention and the second invention, respectively, and the same reference numerals are given because the basic configurations are the same.

The main body of the fluid-filled 1 re-engine mount 1 includes a base member 1o fixed to the vehicle body frame, a mounting member 2o connected to the engine, and the base member 10 and the mounting member 20.
．． ! : and an umbrella-shaped elastic member 30 that connects the.

□ That is, the base member 1o is the base plate 11
A cylindrical body 15f is erected on the upper surface, and a 7 flange portion of the base plate 11 extending outward from the cylindrical body 15 is provided with mounting holes 12 for attaching to the vehicle body frame. An elastic member 3 is attached to the upper inner circumference of the cylindrical body 15 of the base member 1o.
The outer periphery of the umbrella-shaped shear spring rubber 3o is baked, and a thick disc-shaped mounting member 20. is baked, and this mounting member 2o is assembled concentrically with the cylindrical body 15, and the mounting member 2o
An engine mounting bolt 21 is fixedly provided at the center of the engine so as to protrude upward.

Thus, the base plate 11 and cylindrical body 15 of the shite heath member 1o, and the shear spring rubber 3o.

A liquid is filled and sealed in the chamber 2 formed by the mounting part phase 20, so that the mounting member 20 faces above the cylindrical body 15 in a free state.

A variable internal volume member 40 is installed within the chamber 2 of the main body of the fluid-filled engine mount 1.

In this embodiment, the variable internal volume member 40 is a metal bellows, and this bellows 40 is attached to the upper surface of the base grate 11 with a mounting bolt 49 concentrically with the cylindrical body 15 constituting the base portion @10. ing.

In the first invention, only gas is sealed in the bellows 40, so that a gas chamber 41 is formed inside the bellows 40 as shown in FIG.

Furthermore, in the second invention, gas is similarly sealed in the bellows 40, and a liquid is also sealed in the bellows 40.
As shown in FIG. 2, the upper part of the chamber 0 forms a gas chamber 42, and the lower part forms a liquid chamber 43.

Next, the operation of the fluid-filled engine mount 1 according to the present invention constructed as described above will be described.

The first f engine vibrations are a force Fr transmitted to the cylindrical body 15 of the base member 10 via the shear spring rubber 30 and a force Fa transmitted to the base plate 11 of the base member 10 via the liquid sealed in the chamber 2 of the main body. It can be divided into .

A pressure change Δp acts on the liquid in the chamber 2 of the main body due to engine vibration.

Note that the effective cross-sectional area within the cylindrical body 15 of the base member 10 is expressed as IDm, where the diameter is Dm.

In addition, the effective cross-sectional area of the mounting member 20 that directly receives engine vibrations up to the periphery is -D, assuming its diameter iDe.
The effective cross-sectional area within the bellows 40 is expressed as -4Da, where Da is the average diameter.

By the way, with conventional fluid-filled engine mounts,
As mentioned above, the F2O value is −De・Δp, but in the first and second inventions according to the present invention, the bellows 40 is installed in the chamber 2 of the main body upright on the base part 10, Since the gas chambers 41 and 42 are both formed inside the bellows 40, the gas chambers 41 and 42 are expanded and contracted by the amount of pressure change of the liquid inside the main body chamber 2 which acts on the effective cross-sectional area -Da inside the bellows 40, and the bellows 40 The base plate 11, which forms the bottom surface of the chamber 2 of the main body, expands and contracts.

A force of Fa = 7(De - Da, ) - Δp will act.

That is, compared to conventional quizzes, vibration transmission of -Da·29 minutes can be blocked.

The gas chambers 41 and 42 within the bellows 40 change their volumes in the direction of vibration transmission, that is, in the vertical direction, in response to high-frequency vibrations in the high-speed rotation range of the engine, thereby significantly blocking the transmission of high-frequency vibrations to the vehicle body. can do.

Furthermore, in the second invention, since the liquid chamber 43 is configured in the bellows 40 together with the gas chamber 42, the contractible limit of the bellows 40 can be set by the amount of the liquid chamber 43, and the pressure change in the gas chamber 42 can be suppressed to a small extent. Therefore, similarly to the above, transmission of high-frequency vibrations to the vehicle body can be largely blocked, and the liquid chamber 43 becomes a constant, and the contractible limit of the bellows 40 can be set.

In the above embodiment, the internal volume variable member installed inside the main body is explained as the bellows 40, but it may also be a free piston device 140 or a bag body 240 made of an elastic body, as shown in FIGS. 3 and 4, respectively. .

The configuration of each modification example will be described below.

In FIGS. 3 and 4, since the basic structure of the fluid-filled engine vibrators 101 and 201 is the same as above, the same members are numbered in the 100s and 200s, respectively, and given the same reference numerals. I avoided duplicating the explanation.

First, the free piston device 140 shown in FIG.

The upper part of the wide-bottomed cylinder 145 is connected to a cylinder 145 that stands upright on the upper surface of the base plate 111 concentrically with the cylindrical body 115 constituting the base member 110, and a free piston 147 that is fitted in this cylinder 145 so as to be able to slide vertically. A strike ring 146 is fitted on the inner periphery, and a seal ring 148 is fitted on the outer periphery of the free piston 147.

Then, gas is sealed inside the cylinder 145, so that the inside of the cylinder 145 constitutes a gas chamber 141.

Next, the bag body 240 shown in FIG. 4 is made of rubber, and gas is sealed inside, so that the bag body 240, which has a gas chamber 241 inside, is connected to the cylindrical body 215 that constitutes the base member 210. The bag body 240 is concentrically adhesively fixed to the upper surface of the base plate 211, and a spherical recess 245 is formed in the center of the upper part of the bag body 240.

It goes without saying that the free piston device 140 and the bag body 240 according to the modified example of the ring can also provide the same effect of blocking high frequency vibrations as described above, and if liquid is also enclosed,
The liquid chamber functions as a stopper, and each internal volume variable member 1
It is possible to set a deflated limit of 40.240.

In the above explanation, the internal volume variable member is installed on the base member, but the same effect can be obtained even if it is installed on the mounting member.

As is clear from the above description, according to the present invention, gas is sealed in the liquid chamber of the fluid-filled engine mount.
Vibration Transmission Direction IC Because the internal volume variable member that can be expanded and contracted is installed, it is possible to effectively block the transmission of high frequency vibrations of the engine to the vehicle body.
If a liquid is sealed together with gas, the liquid acts as a stopper and can set the contractible limit of the variable internal volume member.

[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 according to the first invention, and FIG.
The figure is a similar view of the second invention, and FIGS. 3 and 4 are views similar to FIG. 1, respectively showing modifications of the internal volume variable member. In the drawings, 1 is a fluid-filled engine mount, 2 is a liquid chamber of the engine mount body, 10 is a base member, 20 is a mounting member, 30 is an elastic member, 40.140240 is a variable internal volume member, 41.42, 141°241 is its gas chamber, 4
3 is the same liquid chamber. Patent Applicant Honda Motor Co., Ltd. Agent Patent Attorney Yoshi Shimoda Patent Attorney Kunio Ohashi

Claims (2)

[Claims] (1) A chamber is formed by connecting the mounting part connected to the engine and the base member on which the engine is mounted using an elastic member that can be elastically deformed by the transmission of vibrations, and liquid is injected into the chamber. A fluid-filled engine mount comprising a fluid-filled engine mount, wherein the mounting portion or the interior side of the base member facing the mounting member is completely filled with gas, and is expandable and contractible in the direction of vibration transmission within the chamber. A fluid-filled engine mount characterized in that a variable internal volume part is installed. (2) The paulownia mounting part connected to the engine is connected to the base member on which the engine is mounted by an elastic member that can be elastically deformed by transmitting all vibrations to form a chamber inside, and a liquid is sealed in the chamber. A fluid-filled engine mount comprising: a fluid-filled engine mount in which both gas and liquid are sealed in the interior side of the mounting member or the base member facing the mounting member, and the content is expandable and contractible in the direction of vibration transmission within the chamber; A fluid-filled engine mount characterized by installing a variable volume member.