JP2009174675A - Torque rod for automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a torque rod for an automobile of novel structure, capable of realizing more advanced vibration control performance, by restraining the transmission of an input load in the twisting direction around the axis that extends in the vehicle horizontal direction. <P>SOLUTION: A cylindrical vibration control device 16 of connecting an outer cylindrical part 24 formed in an end part of a rod 12 and an inner shaft member 38 inserted and arranged into the outer cylindrical part 24 by a body rubber elastic body 42, is adopted as a vibration control device in at least one in the longitudinal direction of the rod 12, and is installed by turning the axis of the cylindrical vibration control deice 16 in the vehicle horizontal direction, and a rolling bearing 48 for allowing the relative rotation around the axis of the inner shaft member 38 and the outer cylindrical part 24, is incorporated into the cylindrical vibration control device 16. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an automobile torque rod that interconnects an automobile power unit and a vehicle body.

  2. Description of the Related Art Conventionally, a power unit including an automobile engine has been supported by a plurality of vibration isolators on the vehicle body in order to reduce vibration transmission to the vehicle body and realize a good ride comfort.

  For example, in the case of a horizontally mounted engine such as a front engine front drive system, the weight of the power unit itself is supported by a plurality of engine mounts, and the torque reaction force of the engine is disposed between the power unit and the vehicle body. The power unit is supported by a torque rod, and the power unit is supported on the vehicle body by vibration isolation by the engine mount and the torque rod. Note that Patent Document 1 (Japanese Patent Laid-Open No. 2005-344664) shows an example of a torque rod.

  Such torque rods are generally arranged at the upper and lower parts of the power unit and extend in the front-rear direction of the vehicle. With such a structure, in the anti-vibration support structure of the power unit using the torque rod, the transmission of the vibration in the vehicle vertical direction, which tends to be a problem as the vibration state of the vehicle, to the vehicle body is suppressed through the torque rod. It is believed that The torque rod extends so that the longitudinal direction of the vehicle is the longitudinal direction with respect to the vertical direction of the vehicle to which the vibration that causes the problem is input, and at one end connected to the power unit side, This is because even when vibration is input, the transmission of vibration to the other end connected to the vehicle body side is suppressed by the twisting displacement of the rod.

  However, in recent years, with higher performance of automobiles, more advanced quietness and better riding comfort are required, and even in the support structure of the power unit using the torque rod, further improvement in vibration isolation performance is required. It has become necessary.

JP 2005-344664 A

  Here, the present invention has been made in the background as described above, and the problem to be solved is an axis extending in the vehicle left-right direction by the action of the torque rod by the vibration input in the vehicle vertical direction. Torque rod for automobiles with a novel structure that can realize higher vibration isolation performance by converting to vibration in the torsional direction and effectively suppressing transmission of input load in the torsional direction Is to provide.

  Hereinafter, the aspect of this invention made | formed in order to solve such a subject is described. In addition, the component employ | adopted in each aspect as described below is employable by arbitrary combinations as much as possible. Further, aspects or technical features of the present invention are not limited to those described below, but are described in the entire specification and drawings, or an invention that can be understood by those skilled in the art from those descriptions. It should be understood that it is recognized based on thought.

  That is, according to the present invention, a vibration isolator is attached to both ends of the rod in the longitudinal direction, the rods are disposed so as to extend in the vehicle front-rear direction, and the crankshaft is oriented horizontally in the vehicle lateral direction. One end of the power unit is attached to the installation type power unit via the vibration isolator, and the other end is attached to the vehicle body via the other vibration isolator. In an automotive torque rod that is vibration-proof connected to the vehicle body, an outer cylindrical portion formed at an end of the rod and the outer cylindrical portion as the vibration-proof device in at least one of the longitudinal directions of the rod The cylindrical vibration isolator is connected to the inner shaft member that is inserted through the main body rubber elastic body, and the central axis of the cylindrical vibration isolator is directed in the vehicle left-right direction. Together to be worn, characterized in that incorporating rolling bearing to allow the center axis of relative rotation between the inner shaft member and the outer tubular portion with respect to the tube-shaped vibration isolator.

  In the torque rod for an automobile having such a structure according to the present invention, the power unit and the vehicle body are connected by a rod extending in the vehicle front-rear direction, so that the power unit is connected to one end in the longitudinal direction of the rod. When a vehicle vertical vibration is input, the input displacement force is converted into a driving force that swings the rod. Thus, it is possible to suppress the vibration in the vehicle vertical direction input from the power unit side from being transmitted to the vehicle body side.

  Further, in the torque rod, a cylinder disposed so that the central axis extends in the left-right direction of the vehicle by converting the force in the vehicle vertical direction input from the power unit side into the driving force in the direction of swinging the rod. A rotational moment is exerted on the anti-vibration device in a torsional direction that is a rotational direction around the central axis, and transmission of the rotational moment to the vehicle body may become a problem.

  Therefore, in the torque rod having the structure according to the present invention, a rolling bearing is incorporated in the cylindrical vibration isolator, and relative rotation about the central axis of the inner shaft bracket and the outer cylinder bracket is allowed. ing. Therefore, transmission of the rotational moment which is a problem in the torque rod arranged so that the rod extends in the vehicle front-rear direction is suppressed, and a higher level of vibration isolation performance can be realized.

  In particular, if the engine speed increases, the vibration of the power unit in the vertical direction of the vehicle increases due to an increase in the inertial force caused by the vertical movement of the piston. Vibration due to the transmission of rotational moment, which is relatively unlikely to be a problem in situations where the vehicle is stopped, is a problem, but by adopting the torque rod according to the present invention, it is possible to effectively reduce vibration during acceleration of the automobile. I can do it.

  In addition, as a rolling bearing employ | adopted, a ball bearing and a roller bearing are employ | adopted suitably. Moreover, any one of the vibration isolator may be a rubber block or a bowl-shaped vibration isolator.

  Further, in the automotive torque rod having the structure according to the present invention, as the vibration isolator at both ends in the longitudinal direction of the rod, the outer cylindrical portion formed at the end of the rod and the outer cylindrical portion You may employ | adopt the cylindrical vibration isolator which connected the inner shaft member inserted and arrange | positioned with the main body rubber elastic body.

  As described above, even when both of the vibration isolators attached to both ends of the rod in the longitudinal direction are cylindrical anti-vibration devices, at least one of these cylindrical anti-vibration devices has the central axis as the left and right sides of the vehicle. In addition to being arranged so as to extend in the direction, a rolling bearing is incorporated into the cylindrical vibration isolator, thereby realizing the intended improvement in the vibration isolating performance.

  Furthermore, in the automotive torque rod having the structure according to the present invention, a rolling bearing that allows relative rotation around the central axis of the inner shaft member and the outer cylindrical portion may be incorporated in the cylindrical vibration isolator. good.

  According to this, it is possible to more effectively suppress the rotational moment around the central axis of each cylindrical vibration isolator from being transmitted to the vehicle body. In particular, when the cylindrical anti-vibration devices are arranged so that the central axes extend in different directions, it is possible to suppress the transmission of rotational moments in different directions, thereby improving the anti-vibration performance. I can do it.

  In addition, in the torque rod for automobiles according to the present invention, the cylindrical vibration isolator is mounted so that the central axis of one of the cylindrical vibration isolator is directed in the vehicle vertical direction. The central axis of the vehicle may be mounted so as to be directed in the vehicle left-right direction.

  Thus, by mounting one cylindrical vibration isolator mounted on both ends of the rod in the longitudinal direction with respect to the vehicle so that the central axis extends in the vehicle vertical direction, the spring in the cylindrical vibration isolator is By utilizing torsion around the central axis where the constant is relatively small, vibration in the yaw direction due to input in the vehicle left-right direction from the power unit can be suppressed from being transmitted to the vehicle body side.

  In addition, it is possible to reduce vibration transmission in the yaw direction more effectively by incorporating a rolling bearing in a cylindrical vibration isolator that is mounted so that the central axis extends in the vehicle vertical direction. .

  In the torque rod for automobiles according to the present invention, it is desirable to employ a bearing having load bearing performance in the direction perpendicular to the axis and in the axial direction as the rolling bearing.

  By adopting bearings with load bearing capability in the direction perpendicular to the axis and in the axial direction as rolling bearings incorporated in the cylindrical vibration isolator, a large load in the direction perpendicular to the axis or in the axial direction is input from the power unit side. Even when incorporated in an anti-vibration device for a torque rod, the input load can be sufficiently supported, and an anti-vibration support structure for a power unit using the torque rod can be effectively realized.

  Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

  First, FIG. 1 and FIG. 2 show an automotive torque rod 10 as an embodiment of the present invention. The torque rod 10 has a structure in which a first rubber bush 14 and a second rubber bush 16 as cylindrical vibration damping devices are attached to both ends of a rod body 12 as a rod. One end of the rod body 12 in the longitudinal direction is attached to the vehicle body 18 via the first rubber bush 14, and the other end is attached to the power unit 20 via the second rubber bush 16. Thus, the vehicle body 18 and the power unit 20 are connected to each other in a vibration-proof manner. In the following description, the vertical direction means the vertical direction in FIG. 1, which is the vertical vertical direction when mounted on the vehicle, unless otherwise specified. Further, the left-right direction means the up-down direction in FIG. 2 which is the left-right direction of the vehicle when the torque rod 10 is mounted on the vehicle unless otherwise specified.

  More specifically, the rod body 12 is formed in a linearly extending rod shape or plate shape, and is a hard synthetic resin material reinforced by mixing a metal material such as iron or aluminum alloy or carbon fiber. The formed high-rigidity member. In the present embodiment, the torque rod 10 is mounted on the vehicle so that the longitudinal direction of the rod body 12 is the vehicle longitudinal direction.

  In addition, a first rubber bush 14 formed by using the first outer cylindrical portion 22 is disposed at one end portion in the longitudinal direction of the rod body 12, and the longitudinal direction of the rod body 12. A second rubber bush 16 formed using the second outer cylindrical portion 24 is disposed at the other end.

  The first and second outer cylindrical portions 22 and 24 have a substantially cylindrical shape and are integrally formed at both ends in the longitudinal direction of the rod body 12. In the present embodiment, the first outer cylindrical portion 22 and the second outer cylindrical portion 24 are such that the central axes of the first outer cylindrical portion 22 and the second outer cylindrical portion 24 are mutually opposite. It is formed so as to extend orthogonally, and in a state where a torque rod 10 to be described later is mounted on the vehicle, the central axis of the first outer cylindrical portion 22 extends in the vehicle vertical direction, and the second outer cylinder The central axis of the shaped portion 24 extends in the vehicle left-right direction.

  The first rubber bushing 14 is formed by assembling the first bushing body 26 to the first outer cylindrical part 22 integrally formed at one end in the longitudinal direction of the rod body 12. Yes. As shown in FIG. 1, the first bush main body 26 includes a first inner cylindrical member 28 as an inner shaft member and a first outer sleeve 30 which are mutually connected by a first main rubber elastic body 32. It has a connected structure.

  More specifically, the first inner cylinder fitting 28 has a thick, small-diameter, generally cylindrical shape, and is a highly rigid member formed of a metal material such as iron or aluminum alloy. The first inner cylindrical fitting 28 has a smaller diameter than the first outer cylindrical portion 22 and a length in the axial direction.

  The first outer sleeve 30 has a thin, substantially cylindrical shape, and is a highly rigid member like the first inner cylinder fitting 28. Further, the first outer sleeve 30 has a larger diameter than the first inner cylinder fitting 28, and the outer circumference side of the first inner cylinder fitting 28 is separated by a predetermined distance over the entire circumference. It is arrange | positioned so that it may surround. The first outer sleeve 30 has an axial length substantially equal to that of the first outer cylindrical portion 22, and the axial end of the first inner cylinder fitting 28 is the first outer sleeve 30. It protrudes on both sides in the axial direction.

  Further, a first main rubber elastic body 32 is interposed between the radially opposing surfaces of the first inner cylinder fitting 28 and the first outer sleeve 30. The first main rubber elastic body 32 has a thick, substantially cylindrical shape, and its inner peripheral surface is overlapped with the outer peripheral surface of the first inner cylinder fitting 28 and vulcanized and bonded. The outer peripheral surface is superimposed on the inner peripheral surface of the first outer sleeve 30 and vulcanized and bonded. Thus, in the present embodiment, the first main rubber elastic body 32 is formed as an integrally vulcanized molded product including the first inner cylinder fitting 28 and the first outer sleeve 30. In this embodiment, after the vulcanization molding of the first main rubber elastic body 32, the first outer sleeve 30 is subjected to diameter reduction processing such as eight-way drawing, so that the first main rubber elastic body 32 is pre-compressed in the radial direction.

  Furthermore, in the first main rubber elastic body 32 in the present embodiment, slits 34 are formed on both sides of the first inner cylinder fitting 28 in one radial direction. The slit 34 is formed so as to penetrate the first main rubber elastic body 32 in the axial direction, and a pair of slits 34 is attached to the first outer cylindrical portion 22 of the first bush main body 26 described later. The slits 34 are formed so as to face each other in the longitudinal direction of the rod body 12.

  The first bush body 26 is assembled to the other end portion in the longitudinal direction of the rod body 12 by press-fitting and fixing the first outer sleeve 30 to the first outer cylindrical portion 22. . Under the assembly of the first bush main body 26 to the first outer cylindrical portion 22, the first inner cylindrical fitting 28 and the first outer cylindrical portion 22 are interposed via the first main rubber elastic body 32. Thus, the first rubber bushing 14 as one cylindrical vibration isolator in the present embodiment is configured.

  On the other hand, the second rubber bushing 16 is formed by fitting the second bushing body 36 to the second outer cylindrical part 24 integrally formed at the other end in the longitudinal direction of the rod body 12. ing. As shown in FIG. 3, the second bush main body 36 includes a second inner cylindrical member 38 as an inner shaft member and a second outer sleeve 40 which are mutually connected by a second main rubber elastic body 42. It has a connected structure.

  Like the first inner cylinder fitting 28, the second inner cylinder fitting 38 has a substantially cylindrical shape with a thick and small diameter, and is made of a rigid material such as iron. Further, the second inner cylinder fitting 38 has a smaller diameter than the second outer cylindrical part 24 and is longer in the axial direction than the second outer cylindrical part 24.

  Further, an intermediate sleeve 44 is disposed on the outer peripheral side of the second inner cylinder fitting 38. The intermediate sleeve 44 has a substantially cylindrical shape that is thinner and larger in diameter than the second inner cylinder fitting 38, and is disposed on the same central axis as the second inner cylinder fitting 38. It is arranged at a predetermined distance on the outer peripheral side of the inner cylinder fitting 38.

  Further, a second outer sleeve 40 is disposed on the outer peripheral side of the intermediate sleeve 44. The second outer sleeve 40 has a thin, substantially cylindrical shape that is larger in diameter than the intermediate sleeve 44, and is disposed on the same central axis as the second inner cylinder fitting 38 and the intermediate sleeve 44. Thus, the intermediate sleeve 44 is disposed at a predetermined distance on the outer peripheral side.

  Furthermore, a second main rubber elastic body 42 is interposed between the radially facing surfaces of the intermediate sleeve 44 and the second outer sleeve 40. The second main rubber elastic body 42 is a thick rubber elastic body having a substantially cylindrical shape, and its inner peripheral surface is overlapped with the outer peripheral surface of the intermediate sleeve 44 and vulcanized and bonded. The surface is superimposed on the inner peripheral surface of the second outer sleeve 40 and vulcanized and bonded. Thus, in the present embodiment, the second main rubber elastic body 42 is formed as an integral vulcanization molded product 46 including the intermediate sleeve 44 and the second outer sleeve 40. In the present embodiment, after the vulcanization molding of the second main rubber elastic body 42, the second outer sleeve 40 is subjected to diameter reduction processing such as eight-way drawing, so that the second main rubber elastic body 42 is pre-compressed in the radial direction.

  Here, as shown in FIG. 3, a bearing mechanism 48 as a rolling bearing is disposed between the second inner cylinder fitting 38 and the intermediate sleeve 44. The bearing mechanism 48 is composed of generally known ball bearings or roller bearings, and is interposed between the second inner cylinder fitting 38 and the intermediate sleeve 44 in the radial direction so that these second inner cylinders. The metal fitting 38 and the intermediate sleeve 44 are connected to each other in a state that allows relative rotation around the central axis.

  More specifically, the bearing mechanism 48 in the present embodiment has a structure in which a plurality of single row angular ball bearings 50 are combined. The single row angular contact ball bearing 50 has a structure in which a steel ball 56 as a rolling element is disposed between an inner ring 52 as a raceway ring and an outer ring 54. In this embodiment, an angular contact bearing having a general structure is adopted as the single row angular contact ball bearing 50.

  The inner ring 52 is formed of bearing steel such as high carbon chrome steel and has a substantially annular shape. An inner contact surface 58 with which the steel ball 56 is brought into sliding contact is formed on the outer peripheral surface of the inner ring 52. The inner contact surface 58 is a tapered surface that is inclined and spreads with respect to the central axis direction of the inner ring 52.

  Further, an outer ring 54 is disposed on the outer peripheral side of the inner ring 52 at a predetermined distance. The outer ring 54 is formed of the same bearing steel as the inner ring 52 and has a substantially annular shape with a larger diameter than the inner ring 52. An outer contact surface 60 with which the steel ball 56 is brought into sliding contact is formed on the inner peripheral surface of the outer ring 54. The outer contact surface 60 is a tapered surface that spreads in an inclined manner with respect to the central axis direction of the outer ring 54, and is opposed to the inner contact surface 58 formed on the inner ring 52.

  A cage 62 is disposed between the inner ring 52 and the outer ring 54. As shown in FIG. 3, the retainer 62 is a substantially ring-shaped member formed of a thin metal material. In this embodiment, the cage 62 is a circular plate-shaped positioning portion that extends in the radial direction. A cylindrical holding portion is integrally formed on the outer peripheral edge. Further, through holes are formed in the holding portion of the holder 62 at equal intervals on the circumference. The through-hole is a circular hole and has a diameter smaller than the diameter of the steel ball 56.

  A steel ball 56 is disposed between the inner ring 52 and the outer ring 54. The steel ball 56 can roll between the opposing surfaces of the contact surfaces 58 and 60 in a state where the steel ball 56 is in contact with the inner contact surface 58 formed on the inner ring 52 and the outer contact surface 60 formed on the outer ring 54. It is arranged in a state. Furthermore, the steel ball 56 is positioned in the circumferential direction by being fitted into a through-hole formed in the cage 62. The steel balls 56 are respectively fitted into a plurality of through holes formed in the cage 62, and the plurality of steel balls 56 are spaced apart from each other by a predetermined distance in the circumferential direction.

  In this way, the plurality of steel balls 56 are disposed between the inner ring 52 and the outer ring 54 so as to be capable of rolling, so that the inner ring 52 and the outer ring 54 are rotated relative to each other around the central axis by the rolling of the steel balls 56. Is acceptable. Note that the contact area between the steel ball 56 and the inner ring 52 and the outer ring 54 is sufficiently small, so that the sliding resistance associated with the relative rotation of the inner ring 52 and the outer ring 54 is extremely small.

  A steel ball 56 is disposed between the inner and outer contact surfaces 58 and 60 inclined with respect to the axial direction, and the steel ball 56, the inner ring 52 and the outer ring 54 are placed on the inner and outer contact surfaces 58 and 60. The contact point that is the contact point is located. Thereby, the nominal contact angle between the steel ball 56 and the inner ring 52 and the outer ring 54 is set between 0 ° and 90 °. Therefore, in the single-row angular contact ball bearing 50 constituting the bearing mechanism 48, a load input in the direction perpendicular to the axis and a load in one direction input in the axial direction so as to shift the inner ring 52 and the outer ring 54 in the axial direction. , Both can be supported. In other words, the single-row angular contact ball bearing 50 has load bearing performance in the direction perpendicular to the axis and load bearing performance in one axial direction.

  The bearing mechanism 48 in this embodiment is configured by combining a plurality of single-row angular contact ball bearings 50 having the above-described structure in the axial direction. In this embodiment, the bearing mechanism 48 is configured by combining four single-row angular contact ball bearings 50 so that the directions in the axial direction are alternately different. In this way, by combining a plurality of single-row angular ball bearings 50 having different directions in the axial direction, the bearing mechanism 48 has load bearing performance in both axial directions.

  The bearing mechanism 48 having such a structure is interposed between the second inner cylinder fitting 38 and the intermediate sleeve 44, and the inner ring 52 is press-fitted into the second inner cylinder fitting 38 to be fitted and fixed. An outer ring 54 is press-fitted into the intermediate sleeve 44 and fixedly fitted. As a result, the integrally vulcanized molded product 46 provided with the second inner cylinder fitting 38 and the intermediate sleeve 44 is connected to each other in a state in which relative rotation around the central axis is permitted.

  The second bush main body 36 is disposed at one end in the longitudinal direction of the rod main body 12 by press-fitting and fixing the second outer sleeve 40 to the second outer cylindrical portion 24. Yes. Under the assembly of the second bush main body 36 to the second outer cylindrical portion 24, the second inner cylindrical fitting 38 and the second outer cylindrical portion 24 are interposed via the second main rubber elastic body 42. Accordingly, a second rubber bush 16 is formed as the other cylindrical vibration isolator in the present embodiment. The torque rod 10 having the structure according to the present embodiment is configured as described above. The second outer sleeve 40 is fixed to the second outer cylindrical portion 24, so that the second inner cylindrical fitting 38 and the second outer cylindrical portion 24 are allowed to rotate relative to each other. In this state, they are elastically connected.

  As shown in FIGS. 4 and 5, the automobile torque rod 10 according to the present embodiment having such a structure is inserted into the first inner metal fitting 28 of the first rubber bush 14. As a result, the first inner cylinder fitting 28 is fixed to the vehicle body 18, and the second inner cylinder fitting 38 is fixed to the power unit 20 by a bolt inserted into the second inner cylinder fitting 38 of the second rubber bush 16. Are fixed to the power unit 20 and the vehicle body 18 via the first and second rubber bushes 14 and 16.

  More specifically, the power unit 20 including the engine 64 and the transmission 66 is a horizontal type power unit in which the crankshaft of the engine 64 is directed in the left-right direction of the vehicle in the engine room, and includes a plurality of engine mounts. 68.

  The engine mount 68 is a known engine mount disclosed in, for example, Japanese Patent Application Laid-Open No. 2005-249063 and Japanese Patent No. 3489500. In this embodiment, the power unit 20 is mounted on both sides in the vehicle left-right direction. Anti-vibration is supported by the side frame 70 via 68. Although not clearly shown in the figure, the side frame 70 is fixed to the vehicle body 18, and the power unit 20 is supported by the vehicle body 18 through vibration isolation via the engine mount 68 and the side frame 70.

  Further, the first rubber bush 14 is attached to the vehicle body 18 and the second rubber bush 16 is attached to the power unit 20, so that the torque rod 10 connects the power unit 20 and the vehicle body 18 to each other. It is mounted so as to extend in the vehicle front-rear direction. In such a state where the torque rod 10 is mounted on the vehicle, the center axis of the first rubber bush 14 extends in the vehicle vertical direction, and the center axis of the second rubber bush 16 extends in the vehicle left-right direction. ing.

  In the present embodiment, the upper torque rod for anti-vibration connection of the upper end portion of the power unit 20 to the vehicle body 18 and the lower portion of the lower end portion of the power unit 20 for anti-vibration connection to the suspension cross member 72 fixed to the vehicle body 18 are provided. Torque rods are arranged at a predetermined distance in the left-right direction of the vehicle. Each of these torque rods is a torque rod 10 having a structure according to the present embodiment.

  When vibration in the vehicle vertical direction is input from the power unit 20 to the second rubber bushing 16 side of the torque rod 10 in such a state that the torque rod 10 is mounted on the vehicle, first, the second main rubber elastic body 42. The anti-vibration effect based on the elastic deformation of is exhibited.

  Further, the vehicle vertical force input from the power unit 20 at the end of the rod body 12 on the second rubber bushing 16 side is driven to swing the rod body 12 in the vehicle vertical direction at the torque rod 10 extending in the vehicle longitudinal direction. Converted into force. Therefore, the displacement force in the vehicle vertical direction of the power unit 20 input to one end of the rod body 12 is applied to the other end of the rod body 12 (end on the first rubber bush 14 side). Therefore, it is possible to suppress transmission as a force in the vehicle vertical direction, which is a problem as a vibration state of the vehicle. As a result, it is possible to effectively prevent deterioration in riding comfort, noise, and the like due to the vibration of the power unit 20 in the vehicle vertical direction being directly transmitted to the vehicle body 18 side.

  In the present embodiment, the pair of slits 34 and 34 are formed in the first main rubber elastic body 32 constituting the first rubber bush 14, so that the rod main body 12 is tilted and the first main rubber elastic body 32 is formed. The spring constant when the inner cylindrical fitting 28 and the first outer cylindrical portion 22 are relatively displaced in the twisting direction is suppressed to a small value, and the transmission of vibration is more effectively suppressed.

  Further, when vibration in the vehicle vertical direction is input from the power unit 20 to the torque rod 10, the second inner cylindrical fitting 38 of the second rubber bush 16 and the second outer cylindrical portion 24 are As the rod body 12 is twisted, a torsional load acting in the circumferential direction is exerted.

  Therefore, in the torque rod 10 having the structure according to the present embodiment, a bearing mechanism 48 is interposed between the second inner cylinder fitting 38 of the second rubber bush 16 and the intermediate sleeve 44. Thereby, the rotation around the central axis is realized with low friction between the second inner cylinder fitting 38 and the intermediate sleeve 44, and the second inner cylinder fitting 38 and the second outer cylindrical portion 24 When a vibration load is input in the torsional direction, the bearing mechanism 48 prevents the vibration load from being transmitted.

  Accordingly, it is possible to effectively prevent the deterioration of riding comfort and the generation of abnormal noise caused by the rotation moment around the central axis of the second rubber bushing 16 being transmitted to the vehicle body 18 side. Anti-vibration performance can be realized.

  As described above, according to the torque rod 10 having the structure according to the present embodiment, when vibration in the vehicle vertical direction is input on the power unit 20 side, in addition to the transmission reduction effect of the vertical vibration inherent in the torque rod 10, Since it is connected by the torque rod 10 which is elongated in the longitudinal direction of the vehicle, the transmission of the input rotational moment to the vehicle body 18 can also be effectively suppressed, and extremely excellent vibration-proof performance is realized. It can be done.

  Further, the torque reaction force of the engine 64 to be supported by the torque rod 10 is input as a load in the vehicle front-rear direction with respect to the torque rod 10, so that the torque reaction force is perpendicular to the bearing mechanism 48. Entered. Therefore, the second inner cylindrical fitting 38 and the second outer cylindrical portion 24 are relatively displaced in the radial direction without being relatively rotated by the input of the torque reaction force. The torque reaction force is supported by the torque rod 10 in a vibration-proof manner by the compression deformation of the second main rubber elastic body 42.

  In this embodiment, the bearing mechanism 48 is constituted by the angular ball bearing 50 having a load bearing performance in the direction perpendicular to the axis (radial direction). Therefore, it is possible to sufficiently support the torque reaction force of the engine 64 that is input to the torque rod 10 in the vehicle longitudinal direction and is caused to act on the bearing mechanism 48 in the direction perpendicular to the axis.

  Furthermore, in the present embodiment, the bearing mechanism 48 is configured by combining a plurality of angular contact ball bearings 50 having a load bearing performance in one axial direction (axial direction) in the axial direction. It has load-bearing performance in both directions. Therefore, even when a vibration load is input from the power unit 20 in the left-right direction of the vehicle, the input load can be supported by the torque rod 10.

  In the present embodiment, the bearing mechanism 48 has a structure independent of the second inner cylinder fitting 38 and the integrally vulcanized molded product 46 of the second main rubber elastic body 42. The bearing mechanism 48 can be easily realized by using a rolling bearing. Moreover, the required performance can be easily realized by selecting the bearings constituting the bearing mechanism 48 according to the required performance.

  As mentioned above, although one Embodiment of this invention has been described, this is an illustration to the last, Comprising: This invention is not limited at all by the specific description in this Embodiment.

  For example, in the torque rod 10 according to the above-described embodiment, the first rubber bush 14 having a conventional structure is adopted on one side as the vibration isolator disposed at both ends of the rod body 12, and the bearing mechanism 48 is provided on the other side. The structure which employ | adopted the 2nd rubber bush 16 which concerns on this invention which has is shown. However, for example, like the torque rod 74 shown in FIG. 6, rubber bushes 76 and 78 having a structure according to the present invention may be provided at both ends of the rod body 12. In the following description, members and parts that are substantially the same as those of the above-described embodiment are denoted by the same reference numerals in the drawings, and description thereof is omitted.

  That is, in FIG. 6, the bush main body 36 including the bearing mechanism 48 is provided for both the first outer cylindrical portion 22 and the second outer cylindrical portion 24 formed at both ends of the rod main body 12. As a result, the torque rod 74 having the first and second rubber bushes 76 and 78 capable of allowing relative rotation around the central axis of the inner shaft member and the outer cylindrical portion at both ends of the rod body 12 is assembled. Is formed.

  In the torque rod 74, the relative rotation of the inner shaft member and the outer cylindrical portion around the central axis is allowed at both ends of the rod body 12, thereby reducing the spring component in the torsion direction. The effect of preventing transmission of rotational moment is more effectively exhibited.

  In particular, in the torque rod 74, the central axis of the first rubber bush 76 and the central axis of the second rubber bush 78 extend in directions orthogonal to each other, and the central axis of the first rubber bush 76 is the vehicle. A first rubber bush 76 is attached to the vehicle body so as to extend in the vertical direction, and a second rubber bush so that the central axis of the second rubber bush 78 extends in the vehicle left-right direction. 78 is attached to the power unit. According to this, even when a vibration load is input from the power unit in the vehicle left-right direction and a force in the yaw direction (rotation direction around the central axis extending in the vehicle vertical direction) is applied to the torque rod 74, The bearing mechanism 48 provided on the rubber bush 76 allows the relative rotation in the yaw direction of the inner cylindrical fitting 38 and the first outer cylindrical portion 22, thereby preventing transmission of rotational moment to the vehicle body. I can do it.

  In this embodiment, the vibration isolator attached to both ends of the rod main body 12 is a cylindrical anti-vibration device. For example, the anti-vibration apparatus is attached to the end of the rod main body 12 on the vehicle body 18 side. Instead of the first rubber bush 14, a known bowl-shaped vibration isolator or a rubber block shown in Japanese Patent No. 3885416 may be mounted as a vibration isolator.

  Moreover, in the said embodiment, although these rubber bushes 14 and 16 are arrange | positioned so that the center axis | shaft of the 1st rubber bush 14 and the 2nd rubber bush 16 may extend in the direction orthogonal to each other, Even if the first rubber bush 14 and the second rubber bush 16 are arranged so that the central axes of the rubber bush 14 and the second rubber bush 16 both extend in the left-right direction of the vehicle. good. The central axis of the first rubber bush 14 and the central axis of the second rubber bush 16 may extend in different directions other than the directions orthogonal to each other.

  The bearing mechanism 48 shown in the above embodiment is a specific example of a rolling bearing that can be employed in the torque rod according to the present invention, and can employ various other known rolling bearings. . That is, ball bearings such as deep groove ball bearings, four-point contact ball bearings, and self-aligning ball bearings, and roller bearings such as cylindrical roller bearings, tapered roller bearings, and self-aligning roller bearings are suitably employed. In addition, it is desirable to have load-bearing performance with respect to a load perpendicular to the axis (radial load) and an axial load (axial load), and more preferably, by combining a plurality of bearings, It is desirable to have a structure that has load bearing performance with respect to load input.

  Further, in the above-described embodiment, the bearing mechanism 48 as a rolling bearing is realized by mounting a large number of four angular ball bearings 50. However, the rolling bearing is a mounting of a large number of three or five or more bearings, for example. It may be comprised by one bearing, may be implement | achieved by one bearing, and may be comprised by the pair attachment of two bearings.

  Furthermore, in the said embodiment, the bearing mechanism 48 becomes a structure independent with respect to the 2nd inner cylinder metal fitting 38 and the integral vulcanization molded product 46, These 2nd inner cylinder metal fittings 38 and an integral vulcanization molded product 46 is interposed. However, for example, the inner ring of the rolling bearing can be constituted by an inner shaft member, and the rolling bearing can be integrally provided on the inner shaft member. According to this, the assembly process of a rolling bearing can be omitted, and the number of parts can be reduced by configuring the inner ring with the inner shaft member.

  Moreover, in the said embodiment, although the structure which incorporated the rolling bearing in the inner shaft member side rather than the main body rubber elastic body between the inner shaft member and the outer cylindrical part is illustrated, a rolling bearing is main body rubber elasticity. You may incorporate in the outer cylindrical part side rather than the body. Specifically, for example, in the second rubber bush 16 in the embodiment, the second main rubber elastic body 42 is vulcanized and bonded to the second inner cylinder fitting 38 and the second outer sleeve 40. The second inner cylinder fitting 38 and the second outer sleeve 40 can be connected to each other, and a bearing mechanism 48 can be incorporated between the second outer sleeve 40 and the second outer cylindrical portion 24.

  Further, the rod is not limited to a linearly extending shape like the rod main body 12 shown in the above embodiment, and may be, for example, a longitudinal shape that extends in a curved or bent manner.

  In addition, although not enumerated one by one, the present invention can be carried out in a mode to which various changes, modifications, improvements and the like are added based on the knowledge of those skilled in the art. It goes without saying that all are included in the scope of the present invention without departing from the spirit of the present invention.

II sectional drawing of FIG. 2 which shows the torque rod for motor vehicles as one Embodiment of this invention. II-II sectional drawing of FIG. The cross-sectional view which shows the 2nd bush main body of the torque rod. The side view which shows the mounting state to the vehicle of the torque rod. The top view which shows the mounting state to the vehicle of the torque rod. The cross-sectional view which shows the torque rod for motor vehicles as another one Embodiment of this invention.

Explanation of symbols

10, 74: Torque rod, 12: Rod body, 14, 76: First rubber bush, 16, 78: Second rubber bush, 18: Vehicle body, 20: Power unit, 22: First outer tubular portion , 24: second outer cylindrical portion, 28: first inner cylinder fitting, 32: first main rubber elastic body, 38: second inner cylinder metal fitting, 42: second main rubber elastic body, 48 : Bearing mechanism, 50: Angular contact ball bearing

Claims (5)

Anti-vibration devices are attached to both ends in the longitudinal direction of the rod, and the rod is arranged so as to extend in the longitudinal direction of the vehicle. The one end is attached to the vehicle body via the one vibration isolator and the other end is attached to the vehicle body via the other vibration isolator. In automotive torque rods with anti-vibration connection,
As the anti-vibration device in at least one of the longitudinal directions of the rod, an outer cylindrical portion formed at an end of the rod and an inner shaft member inserted through the outer cylindrical portion are provided as a main rubber elastic body. The cylindrical anti-vibration device connected with the inner anti-vibration device is adopted so that the central axis of the cylindrical anti-vibration device is mounted in the vehicle left-right direction, and the inner shaft is attached to the cylindrical anti-vibration device. A torque rod for an automobile, which incorporates a rolling bearing that allows relative rotation of the member and the outer cylindrical portion around the central axis.   As the anti-vibration device at both ends of the rod in the longitudinal direction, an outer cylindrical portion formed at the end of the rod and an inner shaft member inserted and arranged with respect to the outer cylindrical portion are main rubber elastic bodies The torque rod for automobiles according to claim 1, wherein a cylindrical vibration isolator connected by a joint is used.   The torque rod for motor vehicles according to claim 2 which incorporated a rolling bearing which permits relative rotation around the central axis of said inner shaft member and said outer cylindrical part to said cylindrical vibration isolator, respectively.   The center axis of one of the cylindrical vibration isolator is mounted so as to be directed in the vehicle vertical direction, and the center axis of the other cylindrical vibration isolator is mounted so as to be directed in the vehicle left-right direction. 4. The torque rod for automobiles according to claim 2 or 3, wherein the torque rod is used.   The automotive torque rod according to any one of claims 1 to 4, wherein a bearing having load bearing performance in a direction perpendicular to the axis and in the axial direction is adopted as the rolling bearing.

Images