JP6937213B2 - Upper mount for active damper - Google Patents

Description

The present invention relates to an upper mount for an active damper.

Conventionally, for example, as shown in Patent Document 1 below, an inner member to which the upper end of a damper rod is fixed, an intermediate member that surrounds the inner member in the circumferential direction along the rod axis, and an intermediate member have been rotated. The upper mount is known to include an outer member that is enclosed in the direction and attached to the vehicle body side, and an elastic body that is arranged between the inner member and the intermediate member and supports the inner member and the intermediate member so as to be relatively elastically displaceable. Has been done.
On the other hand, as the damper, an active damper including a drive unit capable of controlling the exerted damping force is known.

Japanese Unexamined Patent Publication No. 2012-180872

However, when the conventional upper mount is applied to the active damper, when a large control force in the rod axial direction is applied to the rod by the drive unit, the elastic body is greatly compressed and deformed in the rod axial direction and becomes excessively hard. In this state, if vibration is transmitted to the rod from the tire or the drive part of the active damper, this vibration may not be dampened and absorbed by the elastic body regardless of the frequency, and may be transmitted to the vehicle body. there were.

The present invention has been made in view of the above-mentioned circumstances, and is transmitted to the rod from the tire, the drive unit of the active damper, or the like in a state where a large control force in the rod axial direction is applied to the rod of the active damper. It is an object of the present invention to provide an upper mount for an active damper capable of damping and absorbing vibration regardless of the frequency.

In order to solve the above problems, the present invention proposes the following means.
The upper mount for an active damper according to the present invention has an inner member to which the upper end of the rod of the active damper is fixed, an intermediate member that surrounds the inner member in the circumferential direction along the rod axis, and the intermediate member in circumference. An outer member that is enclosed in the direction and attached to the vehicle body side, and a first elastic body that is disposed between the inner member and the intermediate member and supports the inner member and the intermediate member so as to be relatively elastically displaceable. A second elastic body, which is disposed between the intermediate member and the outer member and supports the intermediate member and the outer member so as to be relatively elastically displaceable, is provided, and the first elastic body is the first elastic body. 2. It is characterized in that it is made of a first rubber material having a higher static spring constant than the second rubber material forming an elastic body.

In the present invention, since the static spring constant of the first rubber material is higher than the static spring constant of the second rubber material, even if a large control force in the rod axial direction is applied to the rod of the active damper, the first elastic body Can be prevented from being excessively hardened due to large compression deformation in the rod axial direction. Therefore, with a large control force in the rod axial direction applied to the rod of the active damper, the vibration transmitted to the rod from the tire, the drive unit of the active damper, etc., is applied only to the second elastic body regardless of the frequency. Not only the first elastic body but also the first elastic body can be dampened and absorbed, and the vibration can be suppressed from being transmitted to the vehicle body.
Further, since the amount of compressive deformation of the first elastic body in the rod axial direction is suppressed, the load applied to the first elastic body can be suppressed, and the durability of the first elastic body can be ensured.
In particular, the first elastic body and the intermediate member are separately placed between the inner member on the vibration generating portion side to which the rod is fixed and the intermediate member, and between the outer member on the vibration receiving portion side and the intermediate member attached to the vehicle body side. Since the second elastic body is arranged, that is, the intermediate member is sandwiched between the vibration generating portion side and the vibration receiving portion side by the first elastic body and the second elastic body, the tire, Alternatively, when high-frequency vibration is transmitted from the drive unit of the active damper to the rod, the intermediate member can be made difficult to vibrate due to its inertial weight. So to speak, the intermediate member can act as a mass of the dynamic damper. Therefore, it is possible to reliably suppress the transmission of high frequency vibration to the vehicle body.

Here, the tan δ of the second rubber material may be larger than the tan δ of the first rubber material.

In this case, since the tan δ of the second rubber material is larger than the tan δ of the first rubber material, the damping of the second elastic body when the intermediate member tries to resonate due to the vibration transmitted to the rod as described above. This resonance can be suppressed by the force.
Further, since the tan δ of the second rubber material having a low static spring constant is larger than the tan δ of the first rubber material having a high static spring constant, high-frequency vibration transmitted from the tire or the drive unit of the active damper to the rod is transmitted. It can be effectively dampened and absorbed by the second elastic body to prevent this vibration from being transmitted to the vehicle body.

Further, the dynamic spring constant of the first rubber material may be lower than the dynamic spring constant of the second rubber material.

In this case, since the dynamic spring constant of the first rubber material is lower than the dynamic spring constant of the second rubber material, the second elastic body receives high-frequency vibration transmitted to the rod from the tire, the drive unit of the active damper, or the like. The first elastic body makes it easier to effectively dampen and absorb the vibration before it is transmitted to the vehicle body, and the vibration can be reliably suppressed from being transmitted to the vehicle body.

According to the present invention, the vibration transmitted to the rod from the tire, the drive unit of the active damper, or the like is attenuated regardless of the frequency, when a large control force in the rod axial direction is applied to the rod of the active damper. And can be absorbed.

It is a vertical cross-sectional view which shows the state which attached the active damper to the upper mount for active damper which concerns on one Embodiment of this invention. It is an enlarged vertical sectional view of the upper mount for an active damper shown in FIG.

Hereinafter, an embodiment of the upper mount for an active damper according to the present invention will be described with reference to FIGS. 1 and 2. The active damper upper mount 10 is applied to, for example, a double wishbone suspension.

The active damper 21 extends substantially in the vertical direction and includes a rod 22 and a cylinder 23. The rod 22 and the cylinder 23 are arranged coaxially with the common shaft. Hereinafter, this common axis is referred to as a rod shaft O, and the direction intersecting the rod shaft O when viewed from the rod shaft O direction is referred to as a radial direction.
The rod 22 projects upward from the cylinder 23. A portion of the rod 22 that protrudes upward from the cylinder 23 is surrounded by a bump stopper 33 from the outside in the radial direction. A male screw portion is formed at the upper end portion of the rod 22. A bracket 24 connected to an arm member (not shown) is attached to the lower end of the cylinder 23. A drive unit 21a for adjusting the damping force exerted by the active damper 21 is attached to the outer peripheral surface of the cylinder 23, for example, according to the frequency of input vibration or the like. Examples of the drive unit 21a include a pump and the like. A lower receiving plate 32 that supports the lower end of the spring 31 is attached to the outer peripheral surface of the cylinder 23. The lower receiving plate 32 is formed in an annular shape and is arranged coaxially with the rod shaft O.

The upper mount 10 for an active damper includes an inner member 11 to which the upper end of the rod 22 of the active damper 21 is fixed, an intermediate member 12 that surrounds the inner member 11 in the circumferential direction along the rod axis O, and an intermediate member 12. The first elastic that is disposed between the outer member 13 that is enclosed in the circumferential direction and is attached to the vehicle body side, the inner member 11 and the intermediate member 12, and supports the inner member 11 and the intermediate member 12 so as to be relatively elastically displaceable. A second elastic body 15 is provided between the body 14 and the intermediate member 12 and the outer member 13 and supports the intermediate member 12 and the outer member 13 so as to be relatively elastically displaceable.

The inner member 11 is formed in an annular shape, and the upper end portion of the rod 22 is inserted inside the inner member 11. The active damper 21 is attached to the active damper upper mount 10 by screwing the nut 25 to the portion of the upper end of the rod 22 that protrudes upward from the inner member 11. The inner member 11 is arranged coaxially with the rod shaft O.

As shown in FIG. 2, the intermediate member 12 has a main body cylinder 16, an annular support plate 17 protruding inward in the radial direction from the inner peripheral surface of the main body cylinder 16, and a diameter from the outer peripheral surface of the main body cylinder 16. An annular upper receiving plate 18 projecting outward in the direction and a fitting cylinder 19 projecting downward from the upper receiving plate 18 are provided. The main body cylinder 16, the support plate 17, the upper receiving plate 18, and the fitting cylinder 19 are arranged coaxially with the rod shaft O.
A portion of the rod 22 that protrudes upward from the cylinder 23 is inserted inside each of the main body cylinder 16 and the support plate 17. The support plate 17 and the upper receiving plate 18 are located in the middle portion of the main body cylinder 16 in the rod axis O direction. The support plate 17 is located below the upper receiving plate 18.

Inside the main body cylinder 16, the inner member 11 is arranged at a portion located above the support plate 17. Inside the main body cylinder 16, the upper end portion of the bump stopper 33 is fitted to a portion located below the support plate 17. The lower end opening edge of the main body cylinder 16 is located below the lower end opening edge of the fitting cylinder 19.
A portion of the lower surface of the upper receiving plate 18 located outside the fitting cylinder 19 in the radial direction and an outer peripheral surface of the fitting cylinder 19 support the upper end portion of the spring 31.

The outer member 13 includes a surrounding cylinder 26 that surrounds the upper portion 16a located above the upper receiving plate 18 of the main body cylinder 16 of the intermediate member 12 from the outside in the radial direction, and the outer member 13 from the lower end portion of the surrounding cylinder 26 to the outside in the radial direction. A flange portion 27 that protrudes toward the top and covers the upper receiving plate 18 from above, and a stopper protrusion 28 that protrudes inward in the radial direction from the upper end portion of the surrounding cylinder 26 are provided. The surrounding cylinder 26, the flange portion 27, and the stopper protrusion 28 are arranged coaxially with the rod shaft O.

The diameter of the surrounding cylinder 26 is gradually increased from the upper side to the lower side. A plurality of through holes are formed in the flange portion 27 at intervals in the circumferential direction, and the outer member 13 is attached to the vehicle side by inserting bolts 29 into these through holes separately.
The positions of the stopper protrusion 28 and the upper end opening edge of the main body cylinder 16 in the rod axis O direction are equal to each other. The inner peripheral edge of the stopper protrusion 28 is located on the outer side in the radial direction from the outer peripheral surface of the main body cylinder 16.

Here, the rebound stopper 34 is mounted in the upper end portion of the main body cylinder 16 of the intermediate member 12. The rebound stopper 34 includes a mounting cylinder 34a fitted in the upper end portion of the main body cylinder 16 and an annular stopper portion 34b protruding outward in the radial direction from the upper end portion of the mounting cylinder 34a. The mounting cylinder 34a and the stopper portion 34b are arranged coaxially with the rod shaft O. The stopper portion 34b is located above the stopper protrusion 28 of the outer member 13 and faces the upper surface of the stopper protrusion 28 in the rod axis O direction.

The second elastic body 15 includes the outer peripheral surface of the upper portion 16a of the main body cylinder 16 in the intermediate member 12, the upper surface of the upper receiving plate 18, the inner peripheral surface of the surrounding cylinder 26 in the outer member 13, the lower surface of the flange portion 27, and the stopper. It is in contact with the protrusion 28 and the lower surface of the stopper portion 34b of the rebound stopper 34.

In the illustrated example, the second elastic body 15 is vulcanized and bonded to the outer member 13, and is in contact with the intermediate member 12 and the rebound stopper 34 in a non-bonded state. The second elastic body 15 is formed in an annular shape and is arranged coaxially with the rod shaft O. The second elastic body 15 is externally fitted to the upper portion 16a of the main body cylinder 16 of the intermediate member 12 in a state of being compressed and deformed outward in the radial direction. The second elastic body 15 is arranged between the intermediate member 12 and the outer member 13 in a state of being compressed and deformed in the rod axis O direction.
The second elastic body 15 may be divided into a portion that is in contact with the surrounding cylinder 26 and the flange portion 27 and a portion that is in contact with the stopper protrusion 28. The second elastic body 15 may come into contact with the outer member 13 in a non-adhesive state and be vulcanized and adhered to at least one of the intermediate member 12 and the rebound stopper 34. The second elastic body 15 may not be in contact with the stopper portion 34b of the rebound stopper 34.

An annular holding plate 35 is provided in the main body cylinder 16 of the intermediate member 12 so that the lower end opening edge of the mounting cylinder 34a of the rebound stopper 34 is in contact with or close to the lower end opening edge. The pressing plate 35 is arranged above the inner member 11. A nut 25 is arranged inside the presser plate 35.
The first elastic body 14 is a portion of the inner peripheral surface of the main body cylinder 16 of the intermediate member 12 located above the support plate 17, the upper surface of the support plate 17, and the upper surface, lower surface, and outer peripheral surface of the inner member 11. And the lower surface of the presser plate 35. The first elastic body 14 is compressionally deformed in both the rod axis O direction and the radial direction. The first elastic body 14 is in contact with the pressing plate 35, the intermediate member 12, and the inner member 11 in a non-adhesive state. The first elastic body 14 may be adhered to at least one of the pressing plate 35, the intermediate member 12, and the inner member 11.

In the first elastic body 14, the thickness of the portion located between the lower surface of the pressing plate 35 and the upper surface of the inner member 11 in the rod axis O direction, the upper surface of the support plate 17, and the lower surface of the inner member 11 The thickness of the portion located between the rod axes in the O direction, the portion of the inner peripheral surface of the main body cylinder 16 of the intermediate member 12 located above the support plate 17, and the outer peripheral surface of the inner member 11. The radial thicknesses of the portions located between are equal to each other. In addition, each of these thicknesses may be different from each other.

The volume of the second elastic body 15 is larger than the volume of the first elastic body 14.
In the second elastic body 15, the radial thickness of the portion located between the outer peripheral surface of the upper portion 16a of the main body cylinder 16 of the intermediate member 12 and the inner peripheral surface of the surrounding cylinder 26 of the outer member 13 is the first. 1 In the elastic body 14, the radial thickness of the inner peripheral surface of the main body cylinder 16 of the intermediate member 12 located between the portion located above the support plate 17 and the outer peripheral surface of the inner member 11. It is thicker than that.

In the second elastic body 15, the thickness of the portion located between the upper surface of the upper receiving plate 18 of the intermediate member 12 and the lower surface of the flange portion 27 of the outer member 13 in the rod axis O direction is the thickness of the first elastic body 15. In 14, the thickness of the portion located between the lower surface of the holding plate 35 and the upper surface of the inner member 11 in the rod axis O direction, and between the upper surface of the support plate 17 and the lower surface of the inner member 11. It is thicker than the thickness in the rod axis O direction at the position.

The first elastic body 14 is made of a first rubber material having a higher static spring constant than the second rubber material forming the second elastic body 15.
The static spring constant can be measured by the method specified in "Reciprocating method" of 6.5 "Test method" of 6 "Static spring characteristic test" in JIS K 6385: 2012. Regarding the measurement conditions (6.4 “test conditions” in JIS K 6385: 2012), the test temperature can be equivalent to the usage environment in the applicable vehicle.

The tan δ of the second rubber material is larger than the tan δ of the first rubber material. Tanδ can be measured using a dynamic tensile viscoelasticity measuring device (for example, a spectrometer manufactured by Ueshima Seisakusho Co., Ltd.) under the conditions of a measurement temperature of 25 ° C., an initial strain of 5%, a dynamic strain of 2%, and a frequency of 10 Hz.

The dynamic spring constant of the first rubber material is lower than the dynamic spring constant of the second rubber material.
The dynamic spring constant Kd is measured by the method specified in 6.1.1 “When using load waveform and deflection waveform” in 6.1 “Non-resonant method” in Japan Rubber Association Standard (SRIS) 3503-1990. be able to. Regarding the measurement conditions (4.3 “Test designation conditions” in SRIS 3503-1990), the test temperature shall be equivalent to the operating environment of the applicable vehicle, the test frequency shall be around the unsprung resonance frequency of the applicable vehicle, and the average load shall be. The spring 1G load of the applicable vehicle can be assumed, and the load amplitude can be used as the usage condition in the applicable vehicle.

As described above, according to the active damper upper mount 10 according to the present embodiment, the static spring constant of the first rubber material is higher than the static spring constant of the second rubber material, so that the rod 22 of the active damper 21 Even if a large control force in the rod shaft O direction is applied to the first elastic body 14, it is possible to prevent the first elastic body 14 from being significantly compressed and deformed in the rod shaft O direction and becoming excessively hard. Therefore, in a state where a large control force in the rod axis O direction is applied to the rod 22 of the active damper 21, the vibration transmitted to the rod 22 from the tire, the drive unit 21a of the active damper 21, or the like is generated regardless of the frequency. , Not only the second elastic body 15 but also the first elastic body 14 can be damped and absorbed, and the vibration can be suppressed from being transmitted to the vehicle body.
Further, since the amount of compression deformation of the first elastic body 14 in the rod axis O direction is suppressed, the load applied to the first elastic body 14 can be suppressed, and the durability of the first elastic body 14 can be ensured. You can also.

In particular, between the inner member 11 and the intermediate member 12 on the vibration generating portion side to which the rod 22 is fixed, and between the outer member 13 and the intermediate member 12 on the vibration receiving portion side attached to the vehicle body side, respectively. The first elastic body 14 and the second elastic body 15 are arranged, that is, the intermediate member 12 has the first elastic body 14 and the second elastic body 15 between the vibration generating portion side and the vibration receiving portion side. When high-frequency vibration is transmitted from the tire or the drive unit 21a of the active damper 21 to the rod 22, the intermediate member 12 is made difficult to vibrate due to its inertial weight. Can be done. So to speak, the intermediate member 12 can act as a mass of the dynamic damper. Therefore, it is possible to reliably suppress the transmission of high frequency vibration to the vehicle body.

Further, since the tan δ of the second rubber material is larger than the tan δ of the first rubber material, when the intermediate member 12 tries to resonate due to the vibration transmitted to the rod 22 as described above, the second elastic body 15 This resonance can be suppressed by the damping force of.
Further, since the tan δ of the second rubber material having a low static spring constant is larger than the tan δ of the first rubber material having a high static spring constant, the high frequency transmitted from the tire or the drive unit 21a of the active damper 21 to the rod 22. The vibration of the tire can be effectively damped and absorbed by the second elastic body 15, and the vibration can be suppressed from being transmitted to the vehicle body.

Further, since the dynamic spring constant of the first rubber material is lower than the dynamic spring constant of the second rubber material, the high-frequency vibration transmitted from the tire or the drive unit 21a of the active damper 21 to the rod 22 is second. Before being transmitted to the elastic body 15, the first elastic body 14 makes it easier to effectively dampen and absorb the vibration, and it is possible to reliably suppress the transmission of this vibration to the vehicle body.

The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

In the above embodiment, the configuration including the rebound stopper 34, the pressing plate 35, and the stopper protrusion 28 of the outer member 13 is shown, but a configuration without these may be adopted.
In the above embodiment, the second elastic body 15 has a configuration having a portion located between the stopper protrusion 28 and the stopper portion 34b of the rebound stopper 34, but a configuration without this portion may be adopted. good.
In the above embodiment, the tan δ of the second rubber material is larger than the tan δ of the first rubber material, but the tan δ of the second rubber material may be tan δ or less of the first rubber material.
In the above embodiment, the dynamic spring constant of the first rubber material is lower than the dynamic spring constant of the second rubber material, but the dynamic spring constant of the first rubber material is changed to the dynamic spring constant of the second rubber material. It may be greater than or equal to the target spring constant.

In addition, it is possible to replace the components in the above-described embodiment with well-known components as appropriate without departing from the spirit of the present invention, and the above-mentioned modifications may be appropriately combined.

10 Upper mount for active damper 11 Inner member 12 Intermediate member 13 Outer member 14 1st elastic body 15 2nd elastic body 21 Active damper 22 Rod O Rod shaft

Claims (2)

The inner member to which the upper end of the rod of the active damper is fixed, and
An intermediate member that surrounds the inner member in the circumferential direction along the rod axis,
An outer member that surrounds the intermediate member in the circumferential direction and is attached to the vehicle body side,
A first elastic body disposed between the inner member and the intermediate member and supporting the inner member and the intermediate member so as to be relatively elastically displaceable.
A second elastic body, which is disposed between the intermediate member and the outer member and supports the intermediate member and the outer member so as to be relatively elastically displaceable, is provided.
The first elastic body is formed of a first rubber material having a higher static spring constant than the second rubber material forming the second elastic body .
An upper mount for an active damper , wherein the tan δ of the second rubber material is larger than the tan δ of the first rubber material. The inner member to which the upper end of the rod of the active damper is fixed, and
An intermediate member that surrounds the inner member in the circumferential direction along the rod axis,
An outer member that surrounds the intermediate member in the circumferential direction and is attached to the vehicle body side,
A first elastic body disposed between the inner member and the intermediate member and supporting the inner member and the intermediate member so as to be relatively elastically displaceable.
A second elastic body, which is disposed between the intermediate member and the outer member and supports the intermediate member and the outer member so as to be relatively elastically displaceable, is provided.
The first elastic body is formed of a first rubber material having a higher static spring constant than the second rubber material forming the second elastic body .
An upper mount for an active damper, characterized in that the dynamic spring constant of the first rubber material is lower than the dynamic spring constant of the second rubber material.

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