JP5693384B2 - Active control torque rod - Google Patents

Description

  The present invention relates to an active control torque rod, and more particularly to an improvement of the invention related to Japanese Patent Application No. 2010-185728 (hereinafter referred to as “prior application”) relating to the prior application of the applicant.

  Anti-vibration by the active control torque rod as described above for high-frequency vibration in the front-rear direction between the one end and the other end of the torque rod, for example, the front-rear direction of the vehicle, is connected to the vibration generating member side via an elastic member. On one end side of the torque rod, the elastic member is used to make the resonance frequency in the front-rear direction sufficiently low, and the resonance at a low frequency is absorbed by the canceling action of the actuator provided in the middle part of the torque rod. Is called.

  However, the elastic member on one end side of the torque rod, which is connected to the vibration generating member side, is often formed in a form in which the planar shape is substantially “eight-shaped” in connection with the connecting structure of the torque rod. If the spring constant in the front-rear direction is reduced in order to reduce the resonance frequency in the front-rear direction due to the relative relationship between the spring constant in the front-rear direction and the vertical direction and the left-right direction orthogonal to the front-rear direction, The resonance frequency in the left-right direction is also reduced, and those resonance frequencies that cannot be absorbed by the actuator are included in the frequency range of vibration input from the vibration generating member side. Therefore, there is a problem that the influence on vibration and noise becomes large.

  The present invention has been made to solve such problems, and the object of the present invention is, in particular, an elastic member applied to the one end side of the torque rod, mostly a rubber material. By adding a contrivance in form to the elastic member, it is possible to reduce only the spring constant in the front-rear direction of the torque rod as needed without substantially affecting the spring constant in the other direction. Resonance frequency in the front-rear direction with a member is set to a low frequency that can be sufficiently absorbed by the actuator, while each resonance that is perpendicular to the front-rear direction and that cannot be absorbed by the actuator in the vertical and horizontal directions. The frequency is kept much higher (for example, 200 to 300 Hz) than the frequency range of vibration input from the vibration generating member side. In order to provide an active control torque rod that can prevent the occurrence of those vertical and horizontal resonances with the elastic member itself and effectively prevent the generation of engine noise caused by those resonances. is there.

  The active control torque rod according to the present invention has one end connected to the vibration generating member side and the other end to the vibration transmitting member side, both of which are connected via an elastic member made of a rubber material. An actuator for absorbing reciprocating vibration in the front-rear direction is provided in the middle part, and the elastic member on one end side connected to the vibration generating member side via the connecting shaft part, for example, the shear spring constant in the front-rear direction Is made smaller than, for example, compression and tension spring constants in the vertical direction and the horizontal direction orthogonal to the front-rear direction.

  Here, the elastic member connected to the vibration generating member side can be formed in a flat plate shape, a column shape, or the like, but preferably has a mountain shape that is convex on one end side or the other end side. More preferably, a concave portion is provided on the side of the elastic member opposite to the convex side.

  By the way, the connecting shaft portion can be formed to protrude in an arbitrary direction from an arbitrary position of the elastic member, but preferably, from the top of the convex of the elastic member or the deepest bottom of the concave, the vibration generating member Protruding linearly toward the side.

  Further, the connecting shaft portion can be provided by being offset in either direction with respect to the center of each elastic member at one end and the other end and the axis passing through the center of the actuator. The shaft portion is disposed on the axis.

  The actuator disposed in the intermediate portion of the torque rod includes a shaft attached in the housing and extending in the front-rear direction, a cylindrical mass member surrounding the shaft, and a coil fixed to the shaft inside the cylindrical mass member. And a winding core, a permanent magnet attached to the inner peripheral surface of the cylindrical mass member, and an elastic coupling member that couples at least one end of the cylindrical mass member to the shaft. The magnetic mass generated between the coil core and the permanent magnet when energized causes the cylindrical mass member to be displaced in the axial direction of the mass member, so that the longitudinal direction from the vibration generating member side to the shaft It is preferable to use a linear movable actuator that applies a vibration driving force having a phase opposite to that of the vibration input to the housing to which the shaft is attached.

  In the active control torque rod according to the present invention, the spring constant in the front-rear direction of the elastic member on one end connected to the vibration generating member side is determined based on, for example, deformation in the shear direction of the elastic member made of a rubber material. And lower than the spring constant based on compression and tensile deformation of the elastic member made of, for example, a rubber material in the left-right direction, and lowering the spring constant in the front-rear direction as necessary, and setting the resonance frequency in the front-rear direction with the actuator As a low frequency that can be sufficiently absorbed, the spring constants in the vertical direction and the horizontal direction are kept high, and the resonance frequency in each direction is high beyond the frequency range of vibration input from the vibration generating member side. By setting the frequency, it is possible to effectively prevent both vertical and horizontal resonances from occurring, and to reduce vibration and noise. Each can be suppressed sufficiently small.

Here, when the elastic member connected to the vibration generating member side has a chevron shape that is convex toward one end side or the other end side, in the relationship with the mass of the elastic member, the front-rear direction and the up / down / left / right directions The required spring constant in the direction can be easily realized.
In this case, when the concave portion is provided on the side opposite to the convex side of the elastic member, the vibration in the front-rear direction of the elastic member is smoothly performed without interference with other components of the torque rod. In addition, the elastic member itself, and thus the torque rod can be made compact, and an increase in the weight of the torque rod can be effectively prevented.

In addition, here, in the case where the elastic member is provided with a connecting shaft portion that linearly protrudes from the convex top portion or the deepest bottom portion of the concave portion toward the vibration generating member side, the connecting shaft portion can be moved from an arbitrary position of the elastic member. Compared to the case of projecting in any direction, the spring constant in each direction can be easily adjusted to the required value, and unintended torsional deformation of the elastic member can be prevented. Thus, it is possible to eliminate the possibility of a decrease in durability of the elastic member.
These are more conspicuous when the connecting shaft portion is arranged on the axis passing through the center of each elastic member at one end and the other end and the center of the actuator.
In other words, when the connecting shaft portion is arranged offset with respect to the axis, there is a risk that a plurality of types of deformation may occur in the elastic member in response to inputs in the front-rear direction, the up-down direction, and the left-right direction. In addition, the adjustment of the spring constant in each direction becomes complicated, and there is a risk that durability will be reduced due to torsional deformation of the elastic member.

  In addition, when the actuator arranged in the middle part of the torque rod is a linear movable actuator as described above, it is attached to the cylindrical mass member on the housing by simple control that simply energizes the coil. The reciprocating motion in the opposite phase to the input vibration to the shaft is performed around the shaft extending in the front-rear direction, so that the canceling driving force is constantly stably applied to the housing from the vibration generating member side. The input high-frequency vibration can be effectively prevented by reducing the resonance frequency of the elastic member and absorbing the reduced frequency resonance by the actuator.

1 is a schematic perspective view showing an embodiment of the present invention, and a schematic vertical sectional perspective view showing an actuator without an internal mechanism. It is an approximate line perspective view showing other embodiments of this invention, and a front view showing an elastic member of one end side. It is a front view which shows the modification of the elastic member of the one end side. FIG. 3 is an enlarged longitudinal sectional view schematically illustrating an actuator.

Embodiments of the present invention will be described below based on the drawings.
The active control torque rod 1 shown in FIG. 1 has one end 2 on a vibration generating member side, for example, a power unit side (not shown) including an engine and a transmission, and the other end 3 on a vibration transmission member side, for example, a vehicle body (not shown). Are connected to each other via respective elastic members 4, 5, which can be made of rubber, and between the one end 1 and the other end 2 between the one end 1 and the other end 2. The actuator 6, which will be described later in detail, which absorbs the back-and-forth reciprocal vibrations between them, can be used by being housed in the housing 7.

  In the illustrated torque rod 1, an elastic member 4 on one end 2 side is fixed to the inner peripheral surface of a high-rigidity ring 8 such as a metal ring so as to be connected to the power unit, and is formed in a mountain shape that protrudes toward the one end 2 side. A connecting shaft portion 9 made of a metal or other high-rigidity member that projects linearly from the top of the elastic member 4 toward the power unit (not shown) is implanted in the elastic member 4, and the elastic member 5 on the other end 3 side is In order to connect to the vehicle body, both the elastic members 5 are made of rigid members, and the outer peripheral surface of the inner cylinder 10 and the outer surface of the inner cylinder 10 arranged in the vertical direction are orthogonal to the central axis of the connecting shaft portion 9. Each cylinder 11 is fixed to each inner peripheral surface by vulcanization or the like.

  For example, the torque rod 1 having such a structure is tightened by horizontally penetrating a bolt or the like on the power unit side into the through hole at the tip end portion of the connecting shaft portion 9 on one end 2 side, and on the other end 3 side, The shaft unit on the vehicle body side is inserted into the inner cylinder 10 and fixed thereto, and the like, and the like, and can be assembled to the power unit and the vehicle body, respectively.

  Here, the connecting shaft portion 9 is preferably disposed on the axis passing through the centers of the elastic members on the one end side and the other end side and the center of the actuator, and the elastic member 4 on the one end side, Forming the concave portion 12 as shown in FIG. 1B on the side opposite to the convex side sufficiently allows free vibration when the elastic member 4 vibrates in the front-rear direction and the torque rod 1. It is preferable to suppress an increase in the weight of the spring, and it is preferable to set the spring constants in the respective directions of front and rear, up and down, and left and right to required values.

By the way, the spring constants in the front-rear direction, the up-down direction, and the left-right direction can also be adjusted by providing a through hole 13 at a required position of the elastic member 4 as illustrated in FIG.
FIG. 3 shows a modified example of the form of formation of the through hole 13 in the elastic member 4, and what is shown in FIG. The spring constant can be reduced with respect to the deformation.

  3B can reduce the spring constant with respect to the vertical deformation of the figure, while the elastic stopper portion 14 has a high rigidity against the deformation of a predetermined amount or more. The spring constant can be increased by indirect contact with the inner peripheral surface of the ring 8 via the lining elastic layer, and the one shown in FIG. In this case, the spring constant is reduced while the elastic stopper portion 15 is indirectly brought into contact with the inner peripheral surface of the high-rigidity ring 8 through a lining elastic layer for deformation exceeding a predetermined amount. This increases the spring constant.

Although the elastic member 4 on the one end 2 side has been described above, the elastic member 4 may have a flat plate shape, a columnar shape, or the like that does not have a mountain-shaped portion that is convex on one side. It is also possible to have a mountain shape that is convex on the other end 3 side and a recess on the one end 2 side.
In any of these cases, it is preferable to form the connecting member so as to protrude from the deepest bottom portion of the central position in the central position and the concave portion of the elastic member 4.

  Here, the actuator 6 accommodated in the housing 7 in the middle portion of the torque rod 1 is configured so that the shaft 21 is disposed in the housing 7 with both elastic members 4, as illustrated in an enlarged longitudinal sectional view in FIG. 5 is attached to the housing 7 in a posture extending on a center line segment C in the front-rear direction passing through the center of 5, and the winding core 22 and the coil 23 are fixed on the shaft 21. A cylindrical mass member 24 that surrounds the core 22 and the coil 23 and is arranged coaxially with the shaft 21 and has two kinds of permanent magnets 25a and 25b having different polarities on the inner peripheral surface thereof. At least one end, in the drawing, only one end is connected to the shaft 21 by an elastic connecting member 26 that can be in the form of, for example, a radial or disk shape.

  In the linear movable actuator 6 configured as described above, the winding core 22 functions as an electromagnet by energizing the coil 23 via the lead wire 27 based on a signal from an external control means (not shown). Depending on the energization direction of the coil 23, magnetic forces having different polarities are applied to the permanent magnets 25a and 26b on the inner circumferential surface of the mass member.

In this case, between the winding core 22 fixed to the shaft 21 and the permanent magnets 25a and 25b of the cylindrical mass member 24 having a floating structure, based on the repelling force and suction force generated according to the polarity of the winding core 22, The mass member 24 is reciprocally displaced toward the elastic member 4 side with respect to the shaft 21 in the central axis direction and in the opposite direction as shown in FIG.
Therefore, based on such reciprocal displacement of the cylindrical mass member 24, a vibration driving force having a phase opposite to the vibration in the front-rear direction input from the power unit (not shown) to the housing 7 of the torque rod 1 through the elastic member 4 is provided. By applying the elastic coupling member 26 and the shaft 21 to the housing 7, it is possible to effectively cancel the input vibration from the power unit to the housing 7.

Here, the displacement of the cylindrical mass member 24 as required can be brought about by applying an alternating current, a pulsating current, or the like to the coil 23, stopping the energization of the coil 23, or the like.
Although not shown, the cylindrical mass member 24 can also be connected to the shaft 21 at both ends thereof. According to this, the displacement of the cylindrical mass member 24 in the central axis direction is more stable. can do.

  According to the active control torque rod 1 as described above, the elastic member 4 that is connected to the power unit side and can be made of rubber is subjected to shear deformation against vibration in the front-rear direction from the power unit, thereby reducing the spring constant. Thus, while the resonance frequency in the front-rear direction is set to a low frequency that can be sufficiently absorbed by the torque rod 1, an elastic member is provided for each vibration in the up-down direction and the left-right direction orthogonal to the front-rear direction. 4 is compressed and tensile deformed to achieve a high spring constant, and both the resonance frequencies in these directions can be set sufficiently higher than the vibration frequency input from the power unit. It is possible to effectively prevent the occurrence of resonance due to the input vibration.

DESCRIPTION OF SYMBOLS 1 Active control torque rod 2 One end 3 The other end 4,5 Elastic member 6 Actuator 7 Housing 8 High-rigidity ring 9 Connecting shaft part 10 Inner cylinder 11 Outer cylinder 12 Recess 13 Through hole 14, 15 Elastic stopper part 21 Shaft 22 Core 23 Coil 24 Cylindrical mass members 25a, 25b Permanent magnet 26 Elastic connecting portion 27 Lead wire C Center line segment

Claims (6)

One end is connected to the vibration generating member side and the other end is connected to the vibration transmitting member side through an elastic member, and an active part is provided with an actuator for absorbing reciprocating vibrations between the one end and the other end in the front-rear direction. A control torque rod,
The spring constant in the front-rear direction of the elastic member on one end side connected to the vibration generating member side via the connecting shaft portion is made smaller than any of the spring constants in the up-down direction and the left-right direction perpendicular to the front-rear direction. Become an active control torque rod.   The active control torque rod according to claim 1, wherein the elastic member connected to the vibration generating member side has a mountain shape that protrudes toward one end side or the other end side.   The active control torque rod according to claim 2, wherein a concave portion is provided on a side opposite to the convex side of the elastic member.   4. The active control torque rod according to claim 2, wherein the elastic member is provided with a connecting shaft portion that protrudes linearly from a convex top portion or a deepest bottom portion of the concave portion toward the vibration generating member side.   The active control torque rod according to claim 4, wherein the connecting shaft portion is disposed on an axis passing through the center of each elastic member at one end and the other end and the center of the actuator. A shaft mounted in the housing and extending in the front-rear direction, a cylindrical mass member surrounding the shaft, a coil and a core fixed to the shaft inside the cylindrical mass member, and an inner circumference of the cylindrical mass member A permanent magnet attached to the surface and an elastic connecting member that connects at least one end of the cylindrical mass member to the shaft, and is generated between the coil core and the permanent magnet by energizing the coil by an external control means. Due to the magnetic field generated, the cylindrical mass member is displaced in the axial direction of the mass member, and the vibration driving force in the opposite phase to the longitudinal vibration input to the shaft from the vibration generating member side is applied to the shaft. The active control torque rod according to any one of claims 1 to 5, wherein the active control torque rod is a linear movable actuator applied to a mounted housing.

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