JP2012255459A - Torque rod - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a torque rod that effectively dissipates heat generated by a vibration offset means sealed and housed in the case part of a connection rod, and eliminates a failure of the vibration offset means and thermal deterioration of an elastic member to be caused by temperature rise in the case part.SOLUTION: In the torque rod, two elastic bushes 1, 2 each mounted on an engine-side member and a vehicle body-side one are connected by the connection rod 3. The vibration offset means of an active control that moves a mass member forward/backward is arranged along a shaft extended in the arrangement direction of each of the two elastic bushes 1, 2 in the connection rod 3. The case part 10, which seals and houses the vibration offset means, is formed surrounding the periphery of the vibration offset means on the connection rod 3. A plurality of heat radiating fins 11, which protrude outward and are extended in the direction of intersecting the extending direction of the connection rod 3 perpendicularly, are provided on at least a part of the outer surface of the case part 10 at intervals in the extending direction of the connection rod 3.

Description

  In the present invention, two elastic bushings attached to each of the engine side member and the vehicle body side member are connected to each other by a connecting rod, and the two elastic bushings are arranged in the connecting rod. The present invention relates to a torque rod provided with an active control vibration canceling means for reciprocating a mass member along an extending shaft, and in particular, mainly due to its own electrical heat generation of the vibration canceling means. The present invention proposes a technique capable of preventing the occurrence of a failure or the like and allowing the torque rod to always exhibit effective damping characteristics.

  When a vehicle power plant (in this application, simply referred to as an “engine”) is attached to the vehicle body side, the engine, the vehicle body side member, As a torque rod that is disposed between and elastically connecting them, the applicant previously disclosed in Japanese Patent Application No. 2010-185728, in a connecting rod that connects two elastic bushes, We proposed an active control vibration canceling means.

  According to this torque rod, the elastic vibration attached to each of the engine side member and the vehicle body side member absorbs input vibration from the engine side, and the mass member of the vibration canceling means can control the amplitude and frequency. Below, the frequency component of the input vibration that could not be absorbed by the elastic bushing can be canceled by displacing it with the opposite phase to the input vibration in the axial direction of the torque rod from the engine side. It is possible to exhibit effective damping characteristics against various input vibrations of amplitude and frequency.

  By the way, in the torque rod as described above, when disposed in a vehicle and used for use, the vibration canceling means that operates by being electrically supplied with a driving force from a driving source is caused by water intrusion or dust mixing. In order to prevent electric leakage, short circuit and other malfunctions and failures, for example, a storage space for the vibration canceling means is formed inside the connecting rod, and the opening of the storage space is disposed in the arrangement state of the vibration canceling means. It is effective to provide the connecting rod with a case portion for hermetically storing the vibration canceling means by covering with a lid member.

However, when the vibration canceling means is hermetically housed in the case portion of the connecting rod in this way, the storage space of the vibration canceling means is shielded from the outer area of the case portion. As a result of the heat generated mainly due to energization of the coil, the temperature inside the case portion rises and the vibration canceling means is not directly air-cooled. Further, there is a risk of causing deterioration due to heat conduction of the elastic member of the elastic bush arranged close to the vibration canceling means.
Moreover, in the torque rod, an elastic member made of a rubber material having a low thermal conductivity or the like of the elastic bush is interposed at any mounting position on the vehicle body side member and the engine side member. The heat dissipation effect cannot be expected by conducting the conducted heat to the vehicle body side member and the engine side member.

  An object of the present invention is to solve such problems of the prior art, and the object of the present invention is to prevent intrusion of water into the vibration canceling means and contamination of dust. By effectively dissipating the heat generated by the vibration canceling means enclosed in the case part of the rod, there is a risk of failure of the vibration canceling means and thermal deterioration of the elastic member due to temperature rise in the case part. The object of the present invention is to provide a torque rod that can effectively exhibit an anti-vibration function against input vibration from the engine side.

The torque rod according to the present invention connects two elastic bushings attached to the engine side member and the vehicle body side member with a connecting rod, and the two elastic bushings are arranged in the connecting rod. An active control vibration canceling means for reciprocating the mass member is disposed along the shaft extending in the installation direction, and the vibration canceling means is sealed by surrounding the vibration canceling means to the connecting rod. A housing part is formed, and at least a part of the outer surface of the case part protrudes outward and a radiating fin extending in a direction perpendicular to the extending direction of the connecting rod is provided in the extending direction of the connecting rod. A plurality is provided at a required interval.
Here, “sealing” does not require that the storage space of the vibration canceling means inside the case portion be airtight, but means that it is sufficient if it is liquid-tight.

  Here, it is preferable that a plurality of protrusions are formed to protrude from the inner surface of the case portion of the connecting rod.

  According to the torque rod of the present invention, when it is used between the engine side member and the vehicle body side member for use, the case portion in which the vibration canceling means is housed electrically gives a driving force. Although the temperature is raised by the heat generated by the vibration canceling means that operates in this manner, a plurality of protrusions projecting outward from at least a part of the outer surface of the case portion and extending in a direction orthogonal to the extending direction of the connecting rod By providing a single radiating fin, air turbulence is mainly generated by the radiating fin in the vicinity of the outer surface of the case portion of the torque rod that receives input vibration in the extending direction of the connecting rod and reciprocates in the rod extending direction. Since the air cooling effect of the case portion can be greatly enhanced, it is possible to effectively promote the heat dissipation of the vibration canceling means to the case portion, resulting from the temperature rise of the vibration canceling means. That failures and can effectively prevent thermal deterioration of the elastic member of the elastic bushing.

  That is, by providing a plurality of heat dissipating fins on the outer surface of the case part, mainly the displacement of the torque rod to which vibration in the extending direction of the connecting rod is input, in the extending direction of the rod, and The air around the torque rod that flows from the front side to the rear side in the traveling direction of the vehicle due to the flow of the vehicle outside air that flows in from the engine side when the vehicle with the torque rod is traveling, In the vicinity of the outer surface of the case part, it is raised to the top side of the radiating fin extending in the direction of blocking the flow, and after getting over the radiating fin, the cold air at a position away from the outer surface of the case is entrained, The turbulent flow generated in each heat dissipating fin in this way is excellent in the case portion where the temperature has become high due to the heat generated by the vibration canceling means. Because it provides a cooling effect, the heat generated from the vibration cancellation means, it is possible to effectively dissipate.

In addition to this, in the above torque rod, by providing a plurality of radiating fins protruding from the outer surface of the case portion, the surface area of the outer surface of the case portion, that is, the outside air contact area of the case portion is greatly increased. Therefore, the heat dissipation from the outer surface of the case portion as described above is performed more efficiently.
For this reason, the temperature rise of the vibration canceling means is sufficiently suppressed, and the vibration canceling means and the elastic bushing have sufficient vibration suppression characteristics over a long period of time without fear of a decrease in the vibration suppression function against the input vibration. It can be demonstrated.

  Here, when a plurality of protrusions are formed to protrude on the inner surface of the case part, the temperature rises due to the heat generated by the vibration canceling means based on the increase in the surface area of the case inner surface due to the formation of the protrusions. As described above, heat transfer to the case portion having an enhanced air cooling effect is further promoted, so that the heat dissipation of the vibration canceling means can be performed more effectively.

It is a perspective view showing one embodiment of this invention. It is sectional drawing which follows the II-II line | wire of FIG. It is a partial expanded sectional view which shows typically the condition of the flow of the air in the outer surface vicinity of a case part. It is a perspective view which shows the torque rod of FIG. 1 in the state which removed one cover member.

Embodiments of the present invention will be described below with reference to the drawings.
The torque rod illustrated in FIG. 1 includes two elastic bushes 1 and 2 that are respectively attached to an engine side member and a vehicle body side member (not shown), and a connecting rod 3 that connects the elastic bushes 1 and 2 to each other. And an active control for reciprocating the mass member 5 along the shaft 4 extending in the direction of arrangement of the two elastic bushes 1 and 2 in the connecting rod 3 as illustrated in a sectional view in FIG. The vibration canceling means 6 is provided.

  According to the illustrated torque rod, when it is disposed between the engine side and the vehicle body side for use, the input vibration in the extending direction of the torque rod from the engine side is caused by, for example, the elastic bush 1. The frequency component of the input vibration that has not been absorbed by the elastic bush 1 is absorbed, and the mass member 5 of the vibration canceling means 6 to which the excitation force is applied is in phase opposite to the input vibration. Since it can be canceled by the reciprocating displacement, various input vibrations from the engine side can be effectively damped to the vehicle body side by controlling the amplitude and frequency of the vibration of the mass member 5 by a control means (not shown). .

  Here, as shown in FIGS. 1 and 2, a rectangular parallelepiped storage space 7 having two openings respectively opening on the outer surface of the connecting rod 3 is formed inside the connecting rod 3. A vibration canceling means is attached to the case portion 10 provided on the connecting rod 3 by attaching the lid members 8 and 9 that cover the openings and seal the storage space 7 to the openings, for example, by screwing or the like. 6 is sealed and stored.

As a result, when the torque rod is used, the vibration canceling means 6 that operates by applying an electric driving force from a driving source (not shown) is effectively protected from water, dust, etc., so that the vibration canceling means 6 makes it possible to exhibit desired damping characteristics over a long period of time.
Here, as shown in FIG. 2, for example, ring-shaped seal members 8 a and 9 a made of a rubber material can be interposed between the connecting rod 3 and the lid members 8 and 9, respectively. As a result, the vibration canceling means 6 can be stored in the case portion 10 in a liquid-tight manner.

By the way, when the vibration canceling means 6 is hermetically stored in the case portion 10 of the connecting rod 3 as described above, the storage space 7 of the case portion 10 is shielded from the outside of the case. For example, due to the heat generated by energizing the coil, which will be described later, the temperature inside the case also rises together with the vibration canceling means 6, and even if the vibration canceling means 6 becomes high temperature, it is not directly cooled by air. Since the elastic members having low thermal conductivity of the elastic bushes 1 and 2 that are present at the location where they are attached to the engine side member or the like inhibit the conduction of the heat of the vibration canceling means 6 to the engine side member or the like, torque A sufficient heat dissipation effect cannot be obtained by heat transfer between the members constituting the rod and to the outside of the torque rod.
Therefore, in the present invention, as illustrated in FIG. 1, a case is used to prevent failure of the vibration canceling means 6 and thermal deterioration of the elastic members of the elastic bushes 1 and 2 due to the temperature rise of the vibration canceling means 6. On the outer surface of the portion 10, for example, a plurality of plate-like heat radiation fins 11 extending in a direction orthogonal to the extending direction of the connecting rod 3 are arranged at a predetermined interval in the extending direction of the connecting rod 3.

  By providing such a heat radiating fin 11 on the outer surface of the case portion 10, when the torque rod is used, the torque rod is reciprocated in the rod extending direction due to input vibration from the engine side, and the vehicle is running. A turbulent air flow is generated around the radiating fins 11 extending in a direction orthogonal to the rod extending direction based on the flow of outside air flowing in from the engine side. Since the cooling effect of the outer surface of the portion 10, particularly the outer surface provided with the fins 11, is enhanced, heat dissipation from the case portion 10 is promoted.

Moreover, since the surface area of the outer surface of the case portion 10 is increased by the plurality of heat radiating fins 11, the heat dissipation from the case portion 10 can be performed more efficiently.
As a result of these, the temperature rise of the vibration canceling means 6 is suppressed, and failure of the vibration canceling means 6 and thermal deterioration of the elastic members of the elastic bushes 1 and 2 are effectively prevented.

Here, the heat radiation on the outer surface of the case portion 10 provided with the heat radiation fins 11 is performed in more detail as follows.
When the torque rod is disposed between the engine side and the vehicle body side and used for use, vibrations in the rod extending direction are mainly input from the engine side so that the torque rod in the rod extending direction is input. Since the reciprocating displacement occurs and the torque rod is disposed in the vehicle in a posture in which the extending direction of the torque rod coincides with the longitudinal direction of the vehicle body, the outside air of the vehicle is moved from the engine side when the vehicle is running. Since the air flows in the longitudinal direction of the vehicle body, that is, in the rod extending direction, the air around the torque rod flows in the rod extending direction.

  Here, on the outer surface of the case portion 10 provided with the radiating fins 11, the case outer surface flows in the vicinity of the outer surface of the case portion 10 as illustrated in FIG. 3 by a partially enlarged sectional view along the rod extending direction. The air flow is partially blocked by the radiating fins 11 extending in a direction perpendicular to the rod extending direction (in the drawing, the front and back direction of the paper surface) in a projecting posture from the outer surface of the case, and the air blocked in this way As shown by the white arrow in the figure, the air flows in a direction away from the top surface side of the radiating fin 11, that is, the outer surface of the case portion 10, and moves over the radiating fin 11.

At this time, the air that has passed over the radiating fins 11 has a high temperature between the radiating fins 11 while engulfing cold air at a position away from the outer surface of the case portion 10 heated by the heat generated by the vibration canceling means 6. The cold air flows into the vicinity of the outer surface of the case portion 10 and cools the outer surface of the case.
The air flow as described above is generated in each of the plurality of radiating fins 11 provided on the outer surface of the case portion 10, thereby disturbing the flow of air in the rod extending direction in the vicinity of the outer surface of the case portion 10. And heat dissipation from the case portion 10 is promoted.

Here, in order to obtain a sufficient heat radiating effect in the case portion 10, it is preferable to provide a plurality of heat radiating fins 11 over the entire surface of the case portion 10. However, as shown in FIG. 10 can be provided only on one side surface of the outer surface of the case 10, and although not shown, it can also be provided on only one side surface of the outer surface of the case portion 10 that needs to be cooled.
Further, here, such a heat radiating fin 11 can be integrally formed on the outer surface of the case portion 10, and a fin member formed as a separate member from the case portion 10 is provided on the outer surface of the case portion 10. It can also be provided by attaching it.

  On the other hand, a plurality of, for example, rod-like protrusions 12 can be formed on the inner surface of the case portion 10 as shown in FIG. According to the above, since the surface area of the inner surface of the case increases due to the formation of the plurality of protrusions 12, the air cooling effect on the outer surface of the air in the storage space 7 heated by the heat generated by the vibration canceling means 6 is as described above. The heat transfer to the case portion 10 with the increased can be promoted, and the temperature rise of the vibration canceling means 6 can be further effectively suppressed.

  Here, the shape or the like of the protrusion 12 is not particularly limited as long as it can increase the surface area of the inner surface of the case. For example, the shape of the rod 12 extending in a direction orthogonal to the extending direction of the rod is illustrated. In addition to having a shape, although not shown in the figure, it may be formed in a rod shape that is inclined with respect to the rod extending direction, or protrudes into the storage space 7 in a pin shape. It can also be.

  Moreover, in the place shown in FIG. 1, each of the elastic bushes 1 and 2 is placed inside the outer cylinders 1a and 2a made of a rigid material such as a metal material, and the inner cylinders 1b and 2b also made of a rigid material are, for example, In addition to being arranged concentrically, the inner peripheral surfaces of the outer cylinders 1a and 2a and the outer peripheral surfaces of the inner cylinders 1b and 2b are connected by elastic members 1c and 2c made of a rubber material or the like.

And here, in order to make the spring constants of these two elastic bushes 1 and 2 different from each other, both the elastic bushes 1 and 2 are different in size from each other, and have a large diameter. In order to further reduce the spring constant of the elastic bushing 1, the elastic member 1c of the large-diameter elastic bushing 1 is positioned in the axial direction of the torque rod with the inner cylinder 1b therebetween, and has a substantially M-shape in plan view. Each of the space 1d and the space 1e having a substantially bow shape is provided so as to penetrate in the thickness direction of the elastic member 1c.
According to this, the large-diameter elastic bushing 1 is attached to the engine-side member, and the small-diameter-side elastic bushing 2 is attached to the vehicle body-side member. It is possible to effectively suppress the input vibration without absorbing much of the input vibration from the side and increasing the vibration absorbing capability of the vibration canceling means 6 so much.

The vibration canceling means 6 can be a linear movable actuator as illustrated in FIG.
That is, in the illustrated actuator of the vibration canceling means 6, the both ends of the shaft 4 are fitted and fixed to the opposing wall surfaces in the rod extending direction inside the case portion 10 provided on the connecting rod 3, and A cylindrical mass member 5 whose outer contour shape forms a rectangular parallelepiped shape is disposed around the shaft 4, and the end of the mass member 5 on the side of the large-diameter elastic bush 1 in the drawing is disposed over the entire circumference thereof. For example, a thin plate-like connecting member 13 such as a leaf spring is connected and fixed to the shaft 4.
Further, a pair of adjacent permanent magnets 14 positioned with the shaft 4 interposed therebetween are attached to the inner peripheral surface of the cylindrical mass member 5 in an arrangement state with opposite polarities.
On the other hand, the coil 15 and the winding core 16 are disposed on the shaft 4 at a predetermined interval from the permanent magnet 14, and the coil 15 is energized by control means (not shown) outside the torque rod. One end of the lead wire 17 is connected.

DESCRIPTION OF SYMBOLS 1, 2 Elastic bush 1a, 2a Outer cylinder 1b, 2b Inner cylinder 1c, 2c Elastic member 1d, 1e Cavity 3 Connecting rod 4 Shaft 5 Mass member 6 Vibration canceling means 7 Storage space 8, 9 Lid member 8a, 9a Seal member DESCRIPTION OF SYMBOLS 10 Case part 11 Radiation fin 12 Protrusion part 13 Connection member 14 Permanent magnet 15 Coil 16 Winding core 17 Lead wire

Claims (2)

The two elastic bushes attached to the engine side member and the vehicle body side member are connected to each other by a connecting rod, and along the shaft extending in the arrangement direction of the two elastic bushings in the connecting rod. A torque rod provided with active control vibration canceling means for reciprocating the mass member,
The connecting rod is formed with a case portion surrounding the vibration canceling means and hermetically storing the vibration canceling means. The case portion protrudes outward from at least a part of the outer surface of the case portion, and the connecting rod extends. A torque rod comprising a plurality of heat dissipating fins extending in a direction orthogonal to the current direction at intervals in the direction of extension of the connecting rod.   The torque rod according to claim 1, wherein a plurality of protrusions are formed to project from an inner surface of the case portion of the connecting rod.

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