JP3458319B2 - Switching control type liquid filled type vibration damping device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switching control type liquid filled type vibration damping device mainly used as an engine mount for automobiles.

[0002]

2. Description of the Related Art A liquid filled type vibration damping device as a mount for supporting an automobile engine or the like so as not to transmit the vibration thereof to a vehicle body is a main liquid chamber filled with a liquid, An orifice communicates with a sub-liquid chamber having an air chamber partitioned by a diaphragm, and this orifice provides a vibration damping effect.

Recently, as this type of liquid filled type vibration damping device,
A plurality of, for example, two orifices having different cross-sectional areas are provided between the upper and lower main liquid chambers and the auxiliary liquid chambers, and a rotary valve (pulse motor) selectively selects one of the orifices for the main and sub liquid chambers. Of the switching control type vibration damping device (so-called control mount) to reduce the dynamic spring constant in a wide frequency band by absorbing the vibrations in different frequency bands by the respective orifices by switching the communication. ) Has been proposed (for example, JP-A-5-248480).

In this vibration isolator, two orifices arranged in parallel are selected independently and independently of each other, but since they share the main liquid chamber and the sub liquid chamber, The inlet and outlet have to be set in a substantially diagonal position with respect to the rotatable on-off valve, and therefore the rotor of the rotary valve has to have a large size corresponding to the inner diameter of the main liquid chamber.

As a result, the sliding surface between the rotor and the partition member for forming the orifice, which serves as the case, becomes wider,
They were easily affected by foreign matter and the like, and lacked long-term reliability. In addition, there was a tendency that switching of characteristic changes would not be smooth.

In view of the above, the present invention solves the above problems by making it possible to selectively switch and divert one communicating passage from the main liquid chamber to one of two orifices having different cross-sectional areas. Provided is a switching control type liquid-filled type vibration damping device capable of ensuring high reliability and improving vibration characteristics in a wide range of frequency bands.

[0007]

In the liquid control type vibration damping device of the switching control type according to the present invention, a vibration damping base body made of a rubber elastic body is provided between the vibration source side metal fitting and the support side main metal fitting. In the lower part of the vibration isolating substrate, a main liquid chamber in which the vibration isolating substrate forms a part of a chamber wall, and a sub liquid chamber separated from the main liquid chamber by a partition body, An air chamber partitioned by a sub liquid chamber and a diaphragm, and first and second orifices having different cross-sectional areas provided in the partition body for communicating the main liquid chamber and the sub liquid chamber with each other. In the liquid-filled type vibration damping device, a switching chamber is provided inside the partition body, the switching chamber being interposed between one communication passage from the main liquid chamber and the two orifices communicating with the sub liquid chamber. Room is the device axis
It has a cylindrical shape with an axis perpendicular to
On the peripheral surface of the
Each of them is opened and both orifices are
The openings are on both sides in the circumferential direction with the opening of the communication passage as the middle and
Facing each other at a position perpendicular to the opening direction of the communication passage
It is provided, and one half of one side of the cylindrical side surface is the front
The communication passage and one of both orifices are opened simultaneously.
A rotary valve rotor, which is cut off over a possible angular range , is provided in the switching chamber centering on the axis of the switching chamber.
Rotatably mounted , opposite to the cutout on this rotor
The peripheral side surface on the side of the
Selective and partial communication with either of the orifices
There is a small cutout that allows the passage of 90 ° of this rotor.
For each rotation angle, the excision portion causes the communication passage and the first ohmic contact.
When communicating with the Liffith, the communication passage and the second orientation
When communicating with the fiss, the front of the
A case where the communication passage and the first orifice are partially communicated with each other.
Part of the communication passage and the second orifice,
It is provided so that it can be switched sequentially in four stages when making it
Characterized in that it comprises.

According to this liquid-filled type vibration damping device, the angular position of the cut portion of the rotor is changed in the switching chamber inside the partition body by the rotation of the rotor of the rotary valve.
The communication passage from the main liquid chamber can be switched so as to communicate with either one of the first and second orifices, and the flowing liquid from the main liquid chamber can be divided into one of the orifices. Therefore, the vibration damping effect can be exerted by the liquid column resonance effect corresponding to each orifice, and the vibration in different frequency bands during vehicle running and idling can be effectively reduced.

Also, the first and second orifices
Is a shaft center of the cylindrical switching chamber, which opens in the switching chamber so as to face each other in a direction perpendicular to the opening direction of the communication passage.
The rotation axis of the rotor rotating about the axis of the rotor is perpendicular to the opening direction of the communication passage and both orifices in the switching chamber, and the cutout portion of the rotor is the communication passage and both orifices. more that either one of the bets is excised over an angular range that can be opened at the same time,
It is possible to reliably perform the switching operation of the communication passage by rotating the rotor at a constant angle, and to smoothly perform the characteristic change at the time of switching.

In addition, the peripheral side surface of the rotor on the side opposite to the cut-off portion can be selectively and partially communicated with either one of the communication passage and both orifices by the rotation of the rotor. by obtaining Bei a notch, even in any rotational angular position rotor, without communicating path from the main liquid chamber will be completely blocked, therefore rapidly the main liquid chamber and the auxiliary liquid chamber It is possible to prevent excessive pressure rise.

Further, in the rotor, when the cutting passage communicates the communication passage with the first orifice at every 90 ° rotation angle, when the communication passage communicates with the second orifice, Further, when the communication passage and the first orifice are partially communicated with each other by the small cutout portion, it is possible to sequentially switch to four stages in the case of partially communicating the communication passage and the second orifice. by this <br/> and provided on, for every 1/4 rotation of the rotor, i.e. with the stepping motor can be stopped at every 90 °, can easily control the rotation of the rotor becomes easy implementation .

Further, it is preferable that the cut portion of the rotor is cut obliquely toward the tip. As a result, in addition to being able to enlarge the liquid flow passage in the excision portion to smoothly divide the fluid, and also to reduce the diameter of the rotor acting as a switching valve, the contact area between the rotor and the inner wall surface of the switching chamber, That is, the sliding area can be set small. Therefore, friction loss of the rotary valve can be reduced, long-term reliability can be secured, and the characteristic change at the time of switching can be performed smoothly.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a vertical sectional view of a vibration damping device according to the present invention,
2 is a vertical cross-sectional view taken along line YY of FIG. 1, and FIG. 3 is a cross-sectional view taken along line XX.

In the figure, (1) is a boss metal fitting connected to a vibration source side such as an automobile engine, and (2) is a bottomed cylindrical main body metal fitting connected to a support side such as a vehicle body frame or chassis. Yes, this metal fitting (2) has a window (2
It has a lower side tubular portion (2b) having a) and an upper side tubular portion (2c) having a diameter slightly larger than this.

(3) is a thick anti-vibration base body made of a rubber elastic body, and has a substantially umbrella-shaped curved shape as shown in the figure. The boss metal fitting (1) on the vibration source side is vulcanized and adhered to the upper part of the center of the vibration isolating base (3) in a partially embedded state. Reinforcing metal fittings (3a) are attached to the outer periphery of the lower end of the vibration-proof base (3)
Is vulcanized and adhered, and the reinforcing metal fitting (3a) is fixed to the lower part inside the upper side tubular portion (2c) of the main body metal fitting (2) as described later, and the boss metal fitting (1) and the It is provided between the body fittings (2).

Reference numeral (4) is a partition body fitted in the lower side cylindrical portion (2b) of the main body metal fitting (2), the upper surface of which is circular as shown in the figure, and one side of the lower portion is A notched first partition member (4a) having a substantially trapezoidal cross-section, and a second partition member (4b) having a substantially concave cross-section that fits outside the trapezoidal portion under the circular portion. Therefore, they are combined and configured in a substantially cylindrical shape as a whole.

A liquid is sealed between the upper surface of the first partition member (4a) of the partition body (4) and the vibration isolating base (3), and the vibration isolating base (3) is part of the chamber wall. Is formed as a main liquid chamber (5). Further, the partition body (4)
The lower side is recessed so as to leave the outer peripheral projecting edge (6) protruding downward, and the diaphragm (7) is attached to the lower end of this projecting edge (6) to form a partition ( A sub-liquid chamber (8) is formed between the diaphragm (4) and the diaphragm (7), and the diaphragm (7) and the metal fitting (2) are further formed.
An air chamber (10) communicating with the outside is formed by a communication hole (9) between the bottom part (2d) and the bottom part (2d).

In the case of the figure, the diaphragm (7) has a reinforcing metal fitting (7a) vulcanized and bonded to the outer periphery of the diaphragm (7), and a step portion (2e) at the lower end of the lower tubular portion (2b) of the main metal fitting (2). And is fixed by being sandwiched between the protruding edge portion (6) of the partition body (4).

The partition body (4) has a first orifice (11) having a relatively large cross-sectional area for communicating the main liquid chamber (5) and the sub liquid chamber (8) set above and below. )When,
A second orifice (12) having a smaller cross-sectional area than the first orifice (11), and both orifices (11) (12)
A switching chamber (13) equipped with a rotor of a rotary valve described later for switching between the main liquid chamber (5) and the switching chamber (13) and having a relatively large cross-sectional area. It is provided.

The switching chamber (13) has a cylindrical shape having an axial center orthogonal to the axial center of the vibration isolator inside the first partition member (4a), and inside the switching chamber (13). The rotary valve (20) rotor (2
1) is equipped.

The communication passage (14) penetrates through the center of the upper surface of the first partition member (4a) in the axial direction of the vibration isolator to both the main liquid chamber (5) and the switching chamber (13). The first and second orifices (11) and (12) are opened, and are shown in FIG. 2 on the cylindrical peripheral surface of the switching chamber (13) .
Both sides in the circumferential direction with the opening of the communication passage (14) in the middle
It is caused to open at right angles opposite the two directions in respect opening direction of the communication passage (14). Therefore, the switching chamber (13)
The rotary shaft center of the rotor (21) of the rotary valve (20) installed rotatably around the shaft center of the switching chamber is the communication passage (14) and both orifices (11) (12). The direction is orthogonal to the opening direction in the switching chamber (13).

In the case of the figure, the first orifice (11) having a larger cross-sectional area extends laterally through the inside of the first partition member (4a) from the opening on the side surface of the switching chamber (13), It bends downward and leads to the auxiliary liquid chamber (8). Further, the second orifice (12) having a smaller cross-sectional area passes through the inside of the first partition member (4a) from the opening of the side surface of the switching chamber (13) facing the first orifice (11). The second partition member (4b) extends to the outer periphery of the second partition member (4b).
The outer circumference of b) is bent in the circumferential direction to wrap around the required angle (for example, 90 ° as shown in the figure), and then bent downward to communicate with the sub liquid chamber (8). 1
The passage of 2) is set long.

The opening areas of the first and second orifices (11) and (12) exceed the circular cross-sectional area of the rotor (21), that is, 1/4 of the cross-sectional area of the switching chamber (13). Set so that the flow can be divided effectively by switching the rotor.

In the rotor (21) of the rotary valve (20) provided in the switching chamber (13), one half of one side of the cylindrical side surface part fitted in the switching chamber (13) is As shown in the figure, it is cut diagonally toward the tip, and driven by the motor (22) as an actuator, the axis of the switching chamber (13)
By rotating around the center, the communicating passage (14) and either one of the first and second orifices (11) and (12) are selectively communicated with each other via the cutting portion (23). I'm supposed to get it.

The cut portion (23) of the rotor (21) is cut over an angular range in which the communication passage (14) and either one of the orifices (11) and (12) can be opened simultaneously. Therefore, various cutting shapes can be used without being limited to those cut obliquely toward the tip as shown in the figure. The liquid flow passage in (23) can be made large, and the contact area with the inner wall surface of the switching chamber (13) can be set small, which is particularly preferable in practice.

Further, in the rotor (21), on the peripheral side surface opposite to the cutout portion (23), the communication passage (14) and both orifices (11) are formed by the rotation of the rotor (21). (1
A small cutout (24) that allows selective and partial communication with either one of 2) is provided so that the main liquid chamber can be used regardless of the rotation angle position of the rotor (21). The space between (5) and the sub liquid chamber (8) is not completely blocked. This makes it possible to prevent a sudden pressure increase in the main liquid chamber (5) and the sub liquid chamber (8).

To further explain this, in the case of the two opposite directions at right angles to the communication passage (14),
Using a stepping motor capable of stopping rotation every quarter rotation of the rotor (21), that is, every 90 °, the rotor (2
It is preferable to control the rotational drive of 1), but in this case, if the rotor does not have the small cutout portion (24), the cutout portion (23) is not connected to the communication passageway (14). At the rotation stop position of the rotor that does not face to the side, the pressure in the main liquid chamber (5) may rise rapidly.

That is, from the rotor position where the second orifice (12) in FIG. 4 is selected to the rotor position where the first orifice (11) in FIG. 4 is selected through the rotor position in FIG. When switching, due to the characteristics of the stepping motor, a rotation signal is required three times (phases) every 90 °, during which the cutting portion (23) faces the communication path (14) side. Rotation stop position for two missing phases (Fig. 4
In the state of (inside), the original diversion function cannot be provided, the pressure in the main liquid chamber (5) may rise rapidly, the transmissibility also rises, and shock is felt due to the water hammer phenomenon during switching. Cannot be denied.

On the other hand, as described above, the rotor (21)
A small cutout (24) is provided on the side opposite to the cutout (23) of
At the rotor position in FIG. 4, the small cutout is formed by partially composing the communication passage (14) and one of the orifices (11) and (12). The part (24) allows the liquid in the main liquid chamber (5) or the sub liquid chamber (8) to have fluidity to release the pressure and prevent a rapid pressure increase and a water hammer phenomenon.

Therefore, the rotor (21) is
Using a stepping motor that can be stopped every 4 rotations,
When the communication passage (14) and the first orifice (11) are communicated with each other by the cutting portion (23) at every rotation angle of 0 °, the communication passage (14) and the second orifice (12) are connected to each other. When communicating with each other, or when partially communicating the communication passage (14) with the first orifice (11) by the small notch (24), the communication passage (14) and the second orifice ( 12)
It is preferable to provide the four stages in such a manner that they can be sequentially communicated with each other so that the characteristics can be switched smoothly and easily.

The first and second orifices (11) and (12) are connected to the communication passage (14) in the switching chamber (13).
It is also possible to make the opening of the opening intermediate and open at both sides at a constant angle other than 90 °, but because of the ease of switching control using the stepping motor, the opening of the communication passage (14) is set as described above. It is preferable to open in two opposite directions perpendicular to the direction.

The rotor (21) of the rotary valve (20) has a first partition member (4a) as shown in FIG.
The second partition member (4b) combined with the switching chamber (13) of the second embodiment, is press-fitted and fitted into the lower side tubular portion (2b) of the main body fitting (2). The motor (22) is arranged on a side portion corresponding to the window (2a) of the body fitting (2). (25) is the partition member (4
a) A ring-shaped sealing material such as an O-ring for maintaining airtightness disposed at the joint portion of (4b).

Reference numeral (15) in the figure denotes a stopper metal fitting, which is fitted inside the upper side cylinder portion (2c) of the main body metal fitting (2) and is fixed by caulking means at the upper end portion (2f). In the case of the figure, the reinforcing metal fitting (3a) of the vibration isolating base (3) is pressed between the lower end of the stopper metal fitting (15) and the upper end of the peripheral edge of the tubular portion (4a) of the first partition member (4a). Thus, the vibration-proof base body (3) and the main body metal fitting (2) are joined together. Further, the first partition member (4a) is provided by the reinforcing metal fitting (3a) of the vibration-proof substrate (3).
The peripheral portion of the circular portion of is pressed and fixed.

The stopper metal fitting (15) has an upper end portion extending upward from the stopper flange portion (1a) of the boss metal fitting (1), and the upper end portion is bent inward to form an inner end portion thereof. Is formed as a stopper (15a), and when the upward displacement occurs, the flange portion (1a) abuts upward, and further large upward displacement can be suppressed. (1b) is a rubber portion that allows the stopper action to be performed elastically. (16) indicates a rubber cover.

A mounting member such as a bracket adapted to be fixed to a supporting frame or a chassis is fixed to the main body metal fitting (2) by welding means or the like, as needed.

Assembling of the liquid filled type vibration damping device having the above construction
After disposing the second diaphragm (7) on the step (2e) around the bottom (2d) of the body fitting (2) in the liquid tank, the rotor (21) of the rotary valve (20) is moved to the first position. While being held inside the partition body (4) consisting of the partition member (4a) and the second partition member (4b), the partition member (4) is upwardly moved to the inside of the lower side tubular portion (2b) of the metal fitting (2). More press fit and fit.

Next, the vibration-proof substrate (3) is fitted onto the first support (4) in the main body fitting (2), and the reinforcing fitting (3a) is attached to the first support (4). Place it on the upper end of the tubular part (4a), fit the stopper metal fitting (15) on the upper tubular part (4c), and caulk the upper end of the upper tubular part (2c) to support the first support. Upper end of tubular part (4a) of body (4) and reinforcing metal fitting (3a)
At the same time, tighten and fix the stopper metal fitting (15).

After this, the rubber cover (27) is covered on the boss metal fitting (1) partially embedded and fixed in the vibration-proof substrate (3), and the shaft portion of the rotary valve (20) is further provided with a motor as a driving means. Install (22). This allows easy assembly.

According to the liquid filled type vibration damping device of the above-mentioned embodiment, the rotation of the rotor (21) of the rotary valve (20) causes the rotor (21) to move in the switching chamber (13) inside the partition (4). By changing the angular position of the excision part (23),
The communication passage (14) from the main liquid chamber (5) can be switched to communicate with either one of the first and second orifices (11) and (12), and the flow from the main liquid chamber (5) can be changed. Liquid can be diverted to either orifice (11) or (12).

Therefore, when this anti-vibration device is used for an engine mount of a vehicle, the first and second
The vibration damping effect can be exerted by the liquid column resonance effect corresponding to each of the orifices (11) and (12), and the vibration in different frequency bands during vehicle running and idling can be effectively reduced.

This will be described with reference to FIG. The indications of (open) and (closed) in FIG. 4 indicate that the opening of the first orifice (11), the second orifice (12) and the communication passage (14) respectively correspond to the cut portion (23) of the rotor (21). )
Represents the open / closed state with respect to.

As shown in FIG. 4, when the engine is idling, the cutout portion (23) of the rotor (21) is directed toward the communication passageway (14) and the first orifice (11) side so that the communication passageway (14). )
And the first orifice (11) are communicated with each other, the second orifice (12) is closed (FIG. 4), and the liquid is moved through the first orifice (11) having a large cross-sectional area. Thus, the vibration damping effect is exhibited at the resonance frequency of the first orifice (11).

When the vehicle is traveling, the rotor (21) is rotated by 90 ° so that the excision portion (23) is directed toward the second orifice (12) side so that the communication passage (14) and the second orifice (12). ) And the first orifice (11) is closed so that the movement of the liquid (in FIG. 4) is performed through the second orifice (12) having a small cross-sectional area. Vibration is damped at the resonance frequency of the orifice (12).

In order to switch from the running of the vehicle to the idling, the rotor (21) is rotated by 90 ° to feed through the rotor positions shown in FIG. 4 and return to the state shown in FIG. Good. At the time of this feeding,
At the rotor positions of and, the cutout portion (23) does not face the opening side of the communication passage (14), but it is provided on the opposite side of the cutout portion (23) of the rotor (21). The small cutout portion (24) holds the communication passage (14) and the orifices (11) or (12) in a partially communicated state, so that the main liquid chamber (5) or the sub liquid chamber The rapid pressure rise and water hammer phenomenon of (8) are prevented.

[0046]

As described above, according to the switching control type liquid filled type vibration damping device of the present invention, one communication passage from the main liquid chamber is selectively switched to one of two orifices having different cross-sectional areas. The flow can be divided, and the resonance characteristics of the two orifices can effectively reduce vibrations in two different frequency bands when the vehicle is running and when idling. Moreover, the diameter of the rotor of the rotary valve is much smaller than the inner diameter of the metal fittings, the sliding surface can be set small, friction loss of the rotary valve can be reduced, long-term reliability can be secured, and the characteristics at the time of switching Changes can be made smoothly. In addition, the degree of freedom in design is high, and the optimum cross-sectional area and length of the orifice can be selected according to the required characteristics.

Particularly, by adopting the structure of the present invention,
The stepping motor that can be stopped every 1/4 rotation of the rotor.
Switch control can be performed using a computer, making switching operations easy and reliable
Can be done.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a liquid filled type vibration damping device of the present invention.

FIG. 2 is a cross-sectional view taken along line YY of FIG.

3 is a cross-sectional view taken along line XX of FIG.

FIG. 4 is an explanatory diagram of a switching state by a rotary valve.

[Explanation of symbols]

(1) Boss bracket (2) Body bracket (3) Anti-vibration substrate (4) Partition body (4a) First partition member (4b) Second partition member (5) Main liquid chamber (7) Diaphragm (8) Secondary liquid chamber (10) Air chamber (11) First orifice (12) Second orifice (13) Switching room (14) Communication passage (15) Stopper bracket (20) Rotary valve (21) Rotor (22) Motor (23) Excision part (24) Small cutout

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshiya Tsujimoto 1-17-18 Edobori, Nishi-ku, Osaka City, Osaka Prefecture Toyo Tire & Rubber Co., Ltd. (56) Reference JP-A-6-337034 (JP, A) JP Patent Flat 5-248480 (JP, A) Actual flat 4-122841 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F16F 13 / 00-13 / 30

Claims (2)

(57) [Claims] 1. A vibration isolating base made of a rubber elastic body is interposed between a metal fitting on the vibration source side and a metal fitting on the supporting side, and the vibration isolating base is located below the vibration isolating base on a chamber wall. A main liquid chamber forming a part, a sub liquid chamber separated from the main liquid chamber through a partition body, an air chamber partitioned by the sub liquid chamber and a diaphragm, the main liquid chamber and the sub liquid. First and second cross-sectional areas different from each other provided in the partition body for communicating with the chamber
In a liquid-filled type vibration isolator, the switching chamber interposed in the partition body between one communicating passage from the main liquid chamber and the two orifices communicating with the sub liquid chamber. And this switching chamber is orthogonal to the device axis.
It has a cylindrical shape with an axial center and is located on the peripheral surface of this switching chamber.
The communication passage and both orifices
And the openings of both orifices are connected.
Open the communication passage on both sides in the circumferential direction with the passage opening in the middle.
It is installed at a position perpendicular to the mouth and facing each other.
The approximately half of one side of the cylindrical side surface is
An angle range where either one of the orifices can be opened at the same time.
A rotor of a rotary valve, which is cut off over the circumference, is installed in the switching chamber so as to be rotatable around the axis of the switching chamber, and a peripheral side surface portion of the rotor opposite to the cutting portion is provided.
The rotation of the rotor causes the communication passage and both orifices to
A small unit that allows selective and partial communication with either
A notch is provided for each 90 ° rotation angle of this rotor.
In addition, by the cutout portion, the communication passage and the first orifice
When communicating with each other, the communication passage and the second orifice are connected to each other.
In the case of communicating with each other, the small cutout portion is used to communicate with the communication passage.
When partially communicating with the first orifice, the above
When partially communicating the passage and the second orifice
A switching control type liquid filled type vibration damping device, which is provided so that it can be sequentially switched in four stages . 2. The switching control type liquid filled vibration damping device according to claim 1, wherein the cut portion of the rotor is cut obliquely toward the tip.