JPS6073146A - Liquid-contained vibro-isolator - Google Patents

Abstract

PURPOSE:To effectively operate a liquid-contained vibro-isolator, used in a vehicle's engine mount, through the frequencies covered by a wide vibration damping range by making a throttle slot on the partition plate of the vibro- isolator and making the length of the slot variable according to vibration of an engine. CONSTITUTION:A fixed partition plate 41 having a drain hole 411 thereon and a movable partition plate 42 which is turnably disposed in engagement with the cylindrical part of the plate 41 are installed between a thick rubber resilient wall 1 and a thin resilient wall 6. The movable partition plate 42 has thereon a drain hole 421 displaced from the drain hole 411 in the circumferential direction while the fixed partition plate 41 has thereon a throttle slot 412 which communicates both the drain holes 411 and 421 with each other. The movable partition plate 42 has gear tooth 42 on the external periphery thereof and is turned by a gear 7 linked to the rotary drive mechanism of an engine frequency detector so as to vary the actual length of the throttle slot 412 formed between both the drain holes. The resistance to which contained fluid is subjected when it passes through the slot is thereby varied to regulate the damping coefficient.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a vibration isolating device for use in a vehicle engine mount 1-, which comprises a cut plate (sectioned thick rubber elastic wall) having apertures. A first fluid chamber consisting of a thin rubber elastic wall and a second fluid chamber consisting of a thin rubber elastic wall are placed on the right side, and when the first fluid chamber is deformed due to vibration, the aperture hole of the partition plate is opened to allow 14 liquids to flow. The attenuation effect of photographing is caused by the flow of
This is Riruchino, who is involved in the location of Suigetsujin Soshin Station.

This type of liquid-filled vibration isolator damps low-frequency, large-amplitude vibrations such as cranking vibrations that occur when starting an engine by flowing honeymoon fluid through the throttle hole. It is desirable that the above-mentioned device maintains its attenuation coefficient high throughout the low frequency noisy region 1 and the control region.

However, in the conventional liquid-filled vibration damping device, as shown in FIG. 1, the 'fJN damping coefficient C of the device 6 shows a specific frequency C peak in the damping region 1, and then rapidly decreases. The present invention has been made in view of the above problems, and it is possible to maintain a high C damping coefficient over a wide range of vibration frequencies in a vibration damping region, thereby effectively damping low frequency and large amplitude vibrations. The purpose of the present invention is to provide a liquid-filled vibration isolator that can be used for various purposes.

Therefore, in order to achieve the above object, the inventor discovered that the damping coefficient of the Fi system can always be maximized at each frequency of the damping region by changing the length of the aperture hole depending on the frequency. The idea came to me.

However, the liquid-filled vibration isolator of the present invention has an identification partition plate and a movable iiJ moving plate cutting plate 4 which are movable in contact with the identification partition plate. ?11 is constructed, and each of the inner partition plates is provided with a handling hole (), and a hole is provided in the abutting surface of at least one of the fixed plate (1) and the moving plate (13) and the movable plate (1). grooves are formed at both ends thereof to communicate with the two punched holes, respectively, to form a throttle hole; By changing the position along the groove, the length of the aperture hole can be varied.

The present invention will be explained below with reference to illustrated embodiments.

FIG. 2 is an overall sectional view of the device, and FIG. 3 is a plan view of the device viewed from the side. In the figure, 1 is a container-shaped thick rubber elastic wall with 1 facing downward.

An upper plate 2 having a U-shaped cross section is embedded in the top of the elastic wall 1.
Further, a side plate 3 is joined to the outer periphery of the frontage.

A partition plate 4 is disposed on the bottom surface of the side plate 3, and the partition plate 4 is in contact with the bottom surface of the partition plate 4. A punch hole is formed in the center, and a flexible rubber elastic wall 6 is bonded to cover the punch hole.In this way, inside the device, there is a space between the partition plate 4 and the screen. As a result, a first fluid chamber A having the thick rubber elastic wall 1 as its wall and a second fluid chamber B having the thin rubber elastic wall 6 as its wall are formed.

Now, the partition plate 4 is composed of a fixed partition plate '11J3 and a movable partition plate 42. The internal partition plates 41 and 42 are circular as shown in FIG.
There is C. The movable partition plate 42 has one hole concentrically in the cylinder of A.The fixed partition plate 4'1 has a drilled hole/111 on the circumference, and the movable partition plate 4'Board/'12
71 is spaced apart in the circumferential direction from the above-mentioned punch hole /111.
21 is the setting (see Figure 4).

Then, on one side of the fixed partition plate 711, the above-mentioned double punched holes 4 are provided.
11 and tf/I communicating with /121 are formed in a concentric arc shape, and the aperture holes 4' and 12 are aligned.

iii movement (, 1 cut plate/12 part has tooth shape 422 on the outer periphery)
is formed in the cylindrical wall of the fixed partition plate 7'11.
Yamanaka 771 (i sinking (ah), the above tooth profile 422 gear 7+: 1.717 Ill! , one stage of rotational drive of an engine frequency detection device (not shown)!f/
It is connected to +.

Yamanaka 7 rotates (J Rudo, ii J movable plate cutting plate / 12 is installed in several places on its lower surface, and is pressed against the fixed partition plate / 11 by elastic contact method / 123. In the twisted state C1, the diaphragm hole 412 moves 0 times within a predetermined angle θ (negative) 4), and due to this rotation, the length of the aperture hole 412 changes within a range of j and m.

In addition, 1 engine is set up on the upper plate 2 by Pol 1-21! ! The entire device is fixed to the vehicle body by inserting a bolt into the tC punch hole 31 provided in the flange portion of the side plate 3.

A vibration isolator having the above-mentioned structure is installed, and the movable partition plate 42 is rotated to the right as shown in FIG. 4 when the engine is started. In this state, the length of the throttle hole is the longest, 11/1, and the first fluid chamber A due to engine vibration
The device exhibits a large attenuation coefficient by allowing the honeymoon fluid to flow through the restrictor hole 412 with high resistance as the deformation occurs.

This 11 is indicated by the line Xl in Fig. 55. As is known from Fig. 1.2, the damping coefficient of the device in this case is the lowest frequency (beak) of the damping area IE. When the engine speed gradually reaches 1°, the large-amplitude vibration of μ is effectively damped, the frequency detection device moves according to the frequency (the J cutting plate 42 is rotated counterclockwise. This causes the throttle hole 412 The length of 1. gradually increases in the direction of 12, and the damping coefficient of the device reaches its peak at a higher predetermined frequency in the damping area depending on the length of the aperture hole. Then, while the length of the aperture hole 412 changes from 1 to 2C, the damping coefficient of !!IIFf is calculated as follows:
The low-frequency, large-amplitude vibrations are effectively damped throughout the JRfri region E.

Note that the line x2 in FIG. 5 indicates the vacuum reduction characteristic of the device when the length of the aperture hole 4'12 is 12.

Also, when a low-frequency shaking movement is input at 1 o'clock for both IJ and middle running, the frequency detection device will respond to the frequency (immediately
(...) rotate the illumination cutting plate 42 to an excessive angle,
To quickly attenuate the shake vibration.

As described above, the liquid 41 person vibration isolator of the present invention has the following features:
The partition plate that separates the first and second fluid chambers is composed of a fixed partition plate and a movable partition plate that is in contact with the fixed partition plate. u-shime(,
By changing the length of the aperture hole that communicates with the handling hole provided in both of the cut plates above, the damping coefficient of the device is kept high throughout the vibration damping area, making low frequency large amplitude vibration effective. It is □ that reduces the truth.

Incidentally, in vehicle vibration isolators, it is preferable to have a so-called vibration isolating effect, which absorbs vibrations and prevents their transmission, even in the case of high-frequency, small-amplitude vibrations higher than idling vibrations.

Further, when the vehicle is running 11, it is preferable that both the vibration damping action against the small amplitude vibration and the damping action against the large amplitude shake vibration be performed by μ.

Therefore, the inventor first developed a system that absorbs and covers idling vibrations by closing the sealing fluid between the first and second fluid chambers without resistance, which is released during idling. and move freely within the specified range.
As a function, a movable partition plate is installed that absorbs small amplitude vibrations when the vehicle is running by relieving the internal pressure of the fluid chamber of g81, which deforms as the vehicle swings. He proposed an enclosed vibration isolator (Japanese Patent Application No. 57-230940).

Hereinafter, FIGS. 6 and 7 show examples in which the present invention is applied to the above-mentioned vibration isolating device.

In FIG. 6, in the recess /113 formed on the lower surface of the center of the fixed partition plate 41, a l is movable up and down within a predetermined range.
iJ ff'JI (1 section) [1-8 is set (]
The recesses/I 13 are connected to the first fluid chamber through a number of through holes 41/I provided in the fixed partition plate 41, and are connected to the first fluid chamber through a number of through holes 41/I provided in the fixed partition plate 41, and are connected to the first fluid chamber through a number of through holes 41/I provided in the fixed partition plate 41, The through hole 424 communicates with the fluid chamber opening of ";02".

The fixed partition plate 41 is provided with holes /115 at radially symmetrical positions along with the recessed holes 411 (J), and the movable partition plate /12
A hole is drilled at a symmetrical position in the radial direction with the punched hole 421/l 25
(see Figure 7). 7 J in the rain
[The rotation angle of the cutting plate 42 is θJ in the above embodiment and the rim angle θ'.

If you put it on this type of 4111 vibration isolator, it will be movable)
[By rotating the cutting plate 12 within the angle θ, low-frequency large-amplitude vibrations can be effectively reduced as in the above embodiment.

)' The movable cutting plate 42 is set at the angle θ for the ring 11 and r.
-Although the C rotation is tightened, the hole is pulled out/l -l ′l,
/121 J3 and the extraction holes 415 and 425 coincide, and the sealing fluid flows between both fluid chambers A and B without resistance. This absorbs idle link shooting.

When the vehicle is running, the partition plate 424 is again positioned within the angle θ. As a result, the high-frequency, small-amplitude vibration of the flow 1-8 is attenuated, and the high-frequency, small-amplitude vibration of the flow 1-8 is absorbed by the vertical movement of the flow 1-8.

In addition, in this example, the punch hole /111.7'121
The hole 4'15.425 is not needed for 1.11 if the sealing fluid is deviated large enough to resist (flow η).

As described above, the liquid 14 person vibration isolator of the present invention fl t;k,
The first and second fluid chambers are partitioned and the throttle hole is
A partition plate is formed by a fixed partition plate and a movable partition plate that is in contact with the fixed partition plate and can be slid. Strange and 41st (J: The quality of the aperture hole is changed depending on the engine vibration.
The damping coefficient of the device is maintained high throughout the low-frequency vibration damping region, and J effectively damps large-amplitude vibrations.

[Brief explanation of the drawing]

Fig. 1 is a J diagram showing the damping characteristics of a conventional vibration isolator, Fig. 2 is an overall sectional view of the device of the present invention, an rlJi plane view taken along the If-If line in Fig. 3, and Fig. 13 is a diagram showing the device. Fig. 4 is a front view of the partition plate, and Fig. 5 shows the damping Q':i l!l of the device of the present invention. The figures show another vibration isolator which is applicable to the present invention, and Fig. 6 is a 1fJi side view of all of them, and Fig. 7 is a front view of the A1 cut plate.1...・・・・・・+9 meat 11 bullets 111 bodies L
jV1・・・・・・・・・11-I, IJ 4 anti-4
'1......Fixed partition plate 411, 4
2'l...Extraction hole 4'12...Aperture hole 7'I2...7i1 movement (,1 cutting plate 6...
・・・・・・・・・・i! ? Meat - elasticity 1 ho 4 crane 7.
......Movement 1 stage (tooth width) Fig. 1

Claims (2)

[Claims] (1) A first fluid chamber whose chamber wall is a Ji7 thick rubber elastic wall that supports the Dingjin, and a chamber wall whose thin rubber elastic wall is a chamber wall. and J
and a partition plate that partitions the first fluid chamber and the second fluid chamber, and as the first fluid 3 is deformed due to vibration, honeymoon fluid is placed in the partition plate ( ) Vibration damping is achieved by allowing the liquid to flow through the aperture hole with high resistance.
In a one-person vibration isolator, the above-mentioned ``A'' cutting plate is a fixed partition plate, and a movable ``i'' is in contact with this and is movable. t)
, and the fixed partition plate J3 and iiJ Sen (,11; IJ
On the abutting surfaces of the temporary aperture 41 and b-7j, grooves are formed so that both ends of the apertures communicate with the two punched holes, respectively.
A moving means is provided to move and tighten the movable partition plate according to the engine vibration, and the position of the two punched holes is changed along the above-mentioned line. A liquid-filled vibration isolator with a variable angle of 1°. (2) The movable partition plate is rotatably concentric with the fixed partition plate, and grooves communicating with the two punched holes are formed in concentric arc shapes at the steps () and -b. liquid-filled vibration isolator.