JPH0351539Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of a liquid-filled mount used as a support device for an automobile engine or the like.

[Conventional technology]

For example, in an automobile engine, it is required to take anti-vibration means to prevent shaking and vibration of the engine from being transmitted to the vehicle body. FIG. 4 shows an example of a known liquid-filled mount as a vibration isolator having this function, and is constructed as follows. That is, in the same figure, reference numeral 1 indicates a center member with a bolt 3 attached to the center of a boss 2;
Reference numeral 4 denotes a case member consisting of a first case 5 having a substantially dish-like shape and a second case 6 having a substantially "self"-shaped cross-sectional shape, and both 1 and 4 are spring members made of a rubber-like elastic material. It is connected by 7. The peripheral edge of the first case 5 is bent in the outer diameter direction, and the edge of the spring member 7 reaches near the peripheral edge, and is connected to the diaphragm 8 and the orifice member 9.
Each peripheral edge of is fixed by caulking with the second case 6. A diaphragm 8 whose outer peripheral edge is clamped between the first case 5 and the orifice member 9 is formed of a thin film of rubber-like elastic material. The orifice member 9 is arranged to partition the airtight chamber 10 formed between the spring member 7 and the diaphragm 8 into a first liquid chamber 11 on the center member 1 side and a second liquid chamber 12 on the case member 4 side. The second plate 14 is fitted into the first plate 13 which is approximately in the shape of a flat plate, and a spiral orifice flow path (approximately half a circumference) extending from 15a to 15b is formed across both plates 13 and 14. 15 are provided. Further, a valve chamber 16 is formed between these plates 13 and 14,
A thin disk-shaped sub-diaphragm 17 that vibrates slightly in the vertical direction is inserted into the valve chamber 16, and the valve chamber 16 is connected to the valve chamber 16 through a number of communication holes 18, 19 formed in both plates 13, 14. It communicates with the first and second liquid chambers 11 and 12. Reference numeral 20 is a bolt attached to the center of the first case 5, 21 is a vent hole, and the first and second liquid chambers 11 and 12 are filled with hydraulic fluid.

The liquid-filled mount having the above structure connects either the center member 1 or the case member 4 to the machine base (vehicle body) side, and the other to the supported body (engine) side, thereby generating vibrations in the supported body. absorb. In other words, in order to absorb this vibration, the elastic force of the spring member 7 is utilized, and when a low frequency vibration with a relatively large amplitude is input, the first or second vibration is absorbed depending on the input direction of the vibration. liquid chamber 11,1
The hydraulic fluid in one chamber of 2 is sent to the other chamber through the orifice channel 15, and vibrations are damped by the flow resistance of the hydraulic fluid passing through the channel 15. Furthermore, when high-frequency vibrations with minute amplitudes are input, the hydraulic fluid does not need to pass through the orifice flow path 15, but merely presses the sub-diaphragm 17 in the valve chamber 16 to vibrate it, thereby damping the input vibrations. do.

[Problem that the invention attempts to solve]

In recent years, the so-called upgrading of automobiles has been promoted, and in addition to improving driving performance itself, there is a need to improve ride comfort by preventing unpleasant vibrations from being exerted on passengers. It is required to effectively damp various vibrations generated in an engine. Engine vibrations can be broadly classified into the following three types depending on the operating conditions.

Vibration (shaking) during shock input For example, this occurs when a car runs onto a curb, and the engine acts as a weight and shakes violently, causing the body to vibrate through the mount (the amplitude at the mount point is ±1 mm or more). (below 15Hz). in this case,
The mount requires a large damping force to minimize engine vibration.

Vibration during idling Occurs when the engine speed is between 600 and 800 rpm, and due to rotational fluctuations, the engine vibrates little by little, which is transmitted to the body (at the mount point
0.5~±0.1mm, around 20~30Hz). in this case,
The mount does not require a large damping force, and the dynamic spring constant of the mount is preferably zero.

Vibration when the rotation speed is higher than idling It occurs when the rotation speed is 1000 rpm or more, and causes minute vibrations that cause muffled noise (±
0.1mm or less, 50Hz or more). No damping force is required, and the dynamic spring constant is preferably zero. The conventional mount shown in FIG. 4 uses the flow resistance of the hydraulic fluid passing through the orifice flow path 15 to cope with both vibrations, as shown in FIGS. 5 and 6. It is impossible to effectively attenuate both types of vibrations by means of an orifice having only the unchangeable initial setting orifice characteristics as exemplified in FIG.

The present invention aims to provide a liquid-filled mount that absorbs and attenuates multiple types of vibrations with different amplitudes and frequencies at all times in an optimal state, and also exhibits high performance as described above. The mount was designed to be as simple as possible.

[Means for solving problems]

In order to achieve the above object, the liquid-filled mount of the present invention has an orifice member mounted on a fixing plate attached to the case member, a holding plate fitted on one side of the fixing plate, and a holding plate fitted between the fixing plate and the holding plate. It consists of four parts: a sub-diaphragm and a movable plate, and this orifice member has a
A first orifice flow path using the entire flow path space is formed by forming a spiral flow path space having one end opened to the holding plate side and the other end opened to the fixed member side, and the first orifice flow path using the entire flow path space. forming a second orifice flow path in the holding plate that communicates with the flow path space midway through the flow path space, and connecting a part of the flow path space from the opening to the opening on the fixed member side; The movable plate, which has a number of communicating parts and shielding parts corresponding to the opening on the holding plate side, is connected to an external drive source such as an actuator, and the movable plate is rotatably swingable to connect the first and second orifices. A switching operation is performed to open one of the channels and close the other, and the movable plate and the sub-diaphragm are further configured to determine whether or not to cause the sub-diaphragm to perform a vibration-absorbing operation in accordance with the switching operation of the movable plate. The configuration is such that a stopper means for switching is provided.

[Effect]

When different types of vibrations with different amplitudes and frequencies are input to the mount of the present invention, the mount operates an external drive source to rotate the movable plate of the orifice member to change the orifice characteristics. The stopper means operates the subdiaphragm only when necessary. The above-mentioned orifice characteristics are set in advance so as to be most effective in damping the corresponding input vibration.

〔Example〕

Next, the present invention will be explained in more detail with reference to the drawings.

As shown in FIGS. 1-3, the mount includes novel features in the orifice member generally designated 31. That is, on the upper surface of the annular fixing member 32 which is caulked and fixed to the second case 6 along with the first case 5 and diaphragm 8, there are first (lower) and first Second (middle stage) and third (upper stage) annular step portions 32a, 32b, and 32c are formed concentrically, and a substantially disc-shaped sub-diaphragm 33 is attached to the lower annular step portion 32a located at the inner diameter edge of the fixing member 32. The annular movable plate 3 is fitted into the middle annular step portion 32b.
4 is rotatably fitted into the fixing member 32, and an annular presser plate 35 is fitted into the upper annular step portion 32c. subdiaphragm 3
3. The movable plate 34 and the presser plate 35 are partially overlapped vertically, and the fixing member 3 is fixed by fitting and fixing the presser plate 35 to the upper annular step portion 32c.
2, and the sub diaphragm 33 has an engaging protrusion 3 protruding from a part of the outer periphery.
3a is provided in the lower annular step portion 32a.
When the movable plate 34 is rotated by engaging with the movable plate 34, the movable plate 34 is configured not to rotate together.

A space 36 is formed in the fixing member 32, and the tip of a rod 38 extending from an actuator 37 as an external drive source attached to the outside of the fixing member 32 reaches the space 36. An engaging piece 39 having a notch 40 formed on one side is attached to the tip of the rod 38, and a pin 41 protruding from the lower surface of the movable plate 34 is loosely engaged with the notch 40. Actuator 37 is activated by supplying and discharging boost pressure.
When the rod 38 moves forward and backward, the movable plate 34 rotates and swings within a predetermined angular range (∠θ ₁ ) in accordance with the forward and backward movements. The circumference of the rod 38 is sealed with a sealing member such as an oil seal 42.

The fixing member 32 also includes a lower annular step portion 3.
2a and the middle annular step portion 32b, a channel space 43 having a planar arc shape and opening into the upper surface of the member 32 is formed in a series with an angular range of ∠θ ₂ . , this flow path space 43 _shown by a dashed line _{in FIG} .
∠θ ₃ ) second channel portion 4 with a wide bottom and a deep depth.
3b, and a corresponding flow path 4 is provided at the end of this second flow path portion 43b (the end in the clockwise direction in FIG.
3 and the second liquid chamber 12 are ∠
It is formed with a range of θ ₅ . The upper surface of this flow path space 43 is basically closed by a holding plate 35 and a movable plate 34, but the holding plate 35 includes the first
A notch-shaped first opening 35 is located at a position corresponding to the end of the flow path portion 43a (the end in the counterclockwise direction in FIG. 1).
a is formed to have a range of ∠θ ₁ , so that the flow path space 43 is formed between the first liquid chamber 11 and the second liquid chamber 11.
A first orifice flow path (44, also referred to as a primary nozzle) is set in a spiral configuration connecting the liquid chambers 12 and using the entire flow path space 43 (∠θ ₂ ). This first orifice flow path 44
Since the flow path is long and the first flow path portion 43a is narrow (narrow width and shallow bottom), it has a large damping force to effectively damp the vibrations at the time of the shock input described above.

Second and third openings 35b and 35c each having a notch shape are formed in the presser plate 35 to open the flow path space 4.
It is formed with a range of ∠θ ₇ and ∠θ ₈ so as to communicate with the middle part of the flow path space 43 (which is the second flow path portion 43b).
A _second orifice flow path (45, also referred to as a secondary nozzle) is set from the openings 35b and 35c to the opening 43c on the lower surface of the fixing member 32. This second orifice flow path 45 is short and thick (wide and deep at the bottom) second flow path portion 43
b, and is set to have a damping force suitable for effectively damping the vibrations mentioned above during idling.

The movable plate 34 performs a switching operation to open one of the first and second orifice channels 44 and 45 and close the other. In other words, this movable plate 3
4 has three openings 35 formed in the presser plate 35.
a, 35b, 35c, respectively, notch-shaped communication portions 34a, 34b, 34c and each opening 35a,
Shielding parts 34d and 34 that block 35b and 35c
e, 34f are provided, and when the rod 38 of the actuator 37 reaches the left stroke limit and the movable plate 34 rotates counterclockwise as shown in FIG. The shielding parts 34e and 34f overlap vertically to open the first orifice passage 44, and the shielding parts 34e and 34f overlap with the second and third openings 35b and 35c to close the second orifice passage 45, thereby opening the actuator 37. When the rod 38 reaches the right stroke limit and the movable plate 34 rotates clockwise, the shielding portion 34d overlaps the first opening 35a, closing the first orifice passage 44, and opening the second and third openings 35a. The communication portions 34b and 34c overlap the openings 35b and 35c, opening the second orifice flow path 45. ∠θ ₉ , ∠θ ₁₀ and ∠θ ₁₁ indicate the angular range of the communication portions 34a, 3b, and 34c.

In the configuration up to this point, the mount rotates and oscillates the movable plate 34 through the operation of the actuator 37, thereby opening the first and second orifice channels 44, 4.
5 is switched so that one side is open and the other is closed, and it always exhibits appropriate damping characteristics no matter which of the above vibrations is input. The actuator 37 is operated by measuring the engine speed, throttle angle, vehicle input vibration, road surface irregularities, etc. using sensors, and controlling the supply and discharge of boost pressure based on the information obtained from the sensors. manually or manually. As with the conventional example, the subdiaphragm 33 absorbs the small-amplitude high-frequency vibrations that occur when the rotational speed is higher than the idling speed.

This sub-diaphragm 33 is integrally molded from a vulcanized rubber material, and is held between the fixed member 32 and the movable plate 34 at the lower annular step portion 32a of the fixed member 32 into which the sub-diaphragm 33 is fitted. It has a thick peripheral edge 33b for sealing, and a thin membrane part 33c inside the peripheral edge 33b.
The membrane portion 33c vibrates slightly to absorb the small-amplitude high-frequency vibrations that occur when the rotational speed is higher than that at idling. This sub-diaphragm 33 is pressed by the hydraulic fluid and vibrates slightly even when the above-mentioned vibration is inputted, before the hydraulic fluid flows through the orifice channels 44 and 45. Since the vibration at the time of shock input has a large amplitude, even if the subdiaphragm 33 vibrates, the working fluid can sufficiently pass through the orifice to exhibit the desired orifice characteristics. Since the amplitude of the vibration at the time is relatively small, the amplitude of the sub-diaphragm 33 will reduce the flow rate of the working fluid through the orifice at a large rate, which may result in a situation where appropriate orifice resistance cannot be obtained. . In consideration of this point, the mount is configured so that the sub-diaphragm 33 does not vibrate when the above-mentioned vibration is input.
That is, on the upper surface of the membrane portion 33c of the sub-diaphragm 33, four protrusions 33d having the same height as the peripheral edge 33b are formed in a cross shape at equal intervals, and on the inner diameter edge of the movable plate 34, claw-shaped holding pieces 34g are formed at four equal intervals. A stopper means 46 consisting of a combination of the protrusion 33d and the holding piece 34g is provided, so that when the rod 38 of the actuator 37 reaches the right stroke limit, the movable plate 34 rotates clockwise to open the second orifice flow path. 45 is opened, the holding piece 34g overlaps the protruding part 33d and presses the protruding part 33d, and the membrane part 33
This will prevent the vibration of c.

[Effect of idea]

As explained above, in the liquid-filled mount of the present invention, the movable plate constituting the orifice member is connected to an external drive source so that it can freely rotate and oscillate. The first and second orifice channels are opened and closed to effectively damp each of the various vibrations input to the mount, and the sub-diaphragm is operated only when necessary. It is possible to provide an excellent product that has a simple configuration and meets recent needs without significantly increasing the number of parts.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway plan view showing a liquid-filled mount according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of the same mount taken along line A-B-C-D-E-F in FIG. 1. Fig. 3 is an exploded perspective view showing the orifice member of the same mount, Fig. 4 is a sectional view showing an example of a conventional liquid-filled mount, and Figs. 5 and 6 are graphs showing the orifice characteristics of the same mount. . 1... Center member, 2... Boss, 3, 20...
...Bolt, 4...Case member, 5, 6...Case, 7...Spring member, 8...Diaphragm, 9,
31... Orifice member, 10... Airtight chamber, 1
1, 12...liquid chamber, 32...fixing member, 32a,
32b, 32c... annular stepped portion, 32d... recessed portion,
33... Sub diaphragm, 33a... Engaging protrusion, 33b... Periphery, 33c... Membrane portion, 33d...
...Protrusion, 34...Movable plate, 34a, 34b, 3
4c...Communication part, 34d, 34e, 34f...Shielding part, 34g...Press piece, 35...Press plate, 35
a, 35b, 35c, 43c...opening, 36...
Space, 37... Actuator, 38... Rod, 39... Engaging piece, 40... Notch, 41... Pin, 42... Oil seal, 43... Channel space,
43a, 43b...flow path portion, 44, 45...orifice flow path, 46...stopper means.

Claims (1)

[Scope of utility model registration request] A center member 1 fixed to either one of the machine stand side and the supported body side and a case member 4 fixed to the other are connected via a spring member 7 made of a rubber-like elastic material, and the spring member 7 and An airtight chamber 10 is formed between the diaphragms 8 arranged inside the case member 4,
In a liquid-filled mount in which the airtight chamber 10 is partitioned into two chambers by an orifice member 31 and a working fluid is sealed in the airtight chamber 10, the orifice member 31 is fixed to the case member 4 by a fixing member. 32, a presser plate 35 fitted into one side of the fixed member 32, a sub-diaphragm 33 and a movable plate 34 held between the fixed member 32 and the presser plate 35, and the orifice member 31 An opening 3 is formed at one end on the presser plate 35 side.
5a and an opening 43c at the other end toward the fixing member 32 side, forming a first orifice flow path 44 using the entire flow path space 43, and forming a first orifice flow path 44 using the entire flow path space 43. 35 and another opening 35b, 3 communicating with the middle of the flow path space 43.
5c to form a second orifice flow path 45 extending from the openings 35b and 35c to the opening 43c on the side of the fixing member 32 by forming a part of the flow path space 43, and forming an opening on the side of the holding plate 35. 35a, 35
The number of communication parts 34a, 34 corresponding to those of b, 35c
The movable plate 34 on which the shielding portions 34d, 34e, and 34f are formed is connected to an external drive source such as an actuator 37, and the movable plate 34 is rotatably swingable to move the first and second orifices. A switching operation is performed to open one of the channels 44 and 45 and close the other, and furthermore, the movable plate 34 and the sub-diaphragm 33 are operated to absorb vibration in accordance with the switching operation of the movable plate 34. A liquid-filled mount characterized by being provided with a stopper means 46 for switching whether to operate or not.