JP2006327458A - Power unit mount structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power unit mounting structure enhancing freedom of a layout. <P>SOLUTION: The power unit mounting structure is provided with a cylindrical vehicle body side connection part 61b provided on an upper torque rod 61 for preventing a power unit 3 from rolling by drive reaction force, and connected to a bolt 64 provided on a front body 4 through an insulator 61g. A moment generation means 65 having an inclined surface 65a in which a gap with the bolt 64 is made different in an axial direction and generating moment pivoting in an axial direction of the bolt 64 on the upper torque rod 61 by rearward load of the vehicle directed from the upper torque rod 61 to the bolt 64, is provided on an inner peripheral surface 61h of the vehicle body side connection part 61b. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a mount structure for mounting a power unit including an engine on a vehicle body.

  Conventionally, a power unit mounting structure in which a torque rod that prevents a power unit from rolling more than a predetermined amount by a driving reaction force is provided between a power unit and a vehicle body in a horizontally mounted power unit such as a front-wheel drive vehicle with its inertia main shaft oriented in the vehicle width direction. Are known.

Furthermore, in such a power unit mount structure, when an excessive load is input from the front of the vehicle and the engine is retracted, a bending moment is generated in the torque rod so that the torque rod is not stretched between the power unit and the vehicle body. A technique for preventing the power unit from moving behind the vehicle is known (see, for example, Patent Document 1).
JP 2003-2070 A

  The prior art described in the above-mentioned document has a structure in which an abutting portion is provided on the outer surface of the torque rod, and a receiving portion is provided on the vehicle body at the rearward position of the abutting portion. When the power unit is retracted due to an excessive load input, the abutting portion is brought into contact with the receiving portion to generate a bending moment in the torque rod.

  However, in the above-described conventional technology, it is necessary to secure a space for providing the abutting portion on the outer periphery of the torque rod, and thus there is a possibility of restricting the degree of freedom in layout.

  Accordingly, an object of the present invention is to provide a power unit mount structure that can improve the degree of layout freedom.

  The present invention has been made in view of the above circumstances, and includes a connecting portion of a torque rod that restricts the power unit from rolling by a driving reaction force within a predetermined range, and a support shaft on the vehicle body side to which the connecting portion is connected. In the power unit mount structure, a moment generating means for generating a moment for breaking the torque rod by a load in the rearward direction of the vehicle is provided.

  In the present invention, a moment generating means is provided between the connecting portion of the torque rod and the support shaft on the vehicle body side so that a moment is generated in the torque rod when a load is input, so the layout is provided on the outer periphery of the connecting portion of the torque rod. It is not necessary to secure a space, and the layout flexibility can be improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  The power unit mount structure of this embodiment is interposed between the power units 3 and 32 and the power units 3 and 32 that support the power unit 3 on a front body 4 as a vehicle body, and the power unit 3 is rolled by a driving reaction force. Torque rods 61 and 62 for restricting the movement to a predetermined range, and a support provided on the front body 4 provided on the torque rod 61 and extending in a direction substantially perpendicular to the extending direction of the torque rod 61 via an insulator 61g. A power unit mounting structure including a cylindrical vehicle body side connection portion 61b connected to a shaft (bolt 64), and between the support shaft (bolt 64) and the vehicle body side connection portion 61b, The moment that causes the torque rod 61 to swing in the axial direction of the support shaft (bolt 64) due to the load in the direction is generated. Characterized in that a reinforcement generating means 65.

  A power unit mount structure of Example 1 according to the best mode of the present invention will be described with reference to FIGS.

  First, the configuration will be described.

  As shown in FIGS. 2 and 3, a power unit 3 in which an engine 1 and a transmission 2 are coupled is supported on a front body 4 in a horizontal position.

  The front body 4 includes side members 41 and 42 that are skeleton members having a closed cross section extending in the vehicle front-rear direction on both sides in the vehicle width direction, and a closed state that is spanned between the side members 41 and 42 in the vehicle width direction. A first cross member 43 and a second cross member 44, which are skeleton members having a cross section, are provided. In each figure, the arrow FR indicates the front of the vehicle, the arrow LR indicates the vehicle width direction, and the arrow UP indicates the upper side of the vehicle.

  Further, the hood ridge panels 45, 45 forming the left and right side walls of the engine room 5 are integrally formed with a sub-side member 46, which is a skeleton member having a closed cross section, at the lower part thereof. A strut tower 47 that supports dampers or struts, which are suspension components not shown, is integrally formed.

  Both ends of the power unit 3 in the vehicle width direction are elastically supported by the side members 41 and 42 by mount parts 31 and 32.

  The power unit 3 is centered on the inertia main shaft extending substantially in the vehicle width direction due to the driving reaction force when the torque fluctuates like when an accelerator (not shown) is suddenly stepped on due to the elastic support by the mount portions 31 and 32. To roll.

  Therefore, an upper torque rod 61 and a lower torque rod 62 are provided between the power unit 3 and the front body 4 so as to restrict the roll of the power unit 3 caused by the driving reaction force within a predetermined range.

  The lower torque rod 62 is provided between the vehicle lower end portion of the engine 1 and the second cross member 44. In the first embodiment, the lower torque rod 62 is connected to the engine 1 with a bolt or the like at the position of the shaft 62a, and is connected to the second cross member 44 with a bolt or the like at the position of the shaft 62b. In addition, an insulator formed of an elastic body such as rubber (not shown) is interposed between these connecting portions to make an elastic connection.

  The upper torque rod 61 is provided between the vehicle rear side end of the side of the engine 1 in the vehicle right direction and the vehicle front side end of the upper part of the strut tower 47.

  That is, as shown in FIG. 4, the upper torque rod 61 includes an engine side connecting portion 61a, a vehicle body side connecting portion 61b, and a rod portion 61c.

  The engine side connecting portion 61a is attached to the engine 1 with a bolt 63 extending in the vehicle width direction. The engine side connecting portion 61a includes a cylinder 61d formed of a metal in a cylindrical shape, and an insulator 61e formed of an elastic member such as rubber interposed between the cylinder 61d and the bolt 63. ing.

  The vehicle body side connecting portion 61 b is attached to a bolt 64 as a support shaft fastened to a vehicle body side torque rod support bracket 48 fixed to the strut tower 47. As shown in FIG. 1, the vehicle body side connecting portion 61b is formed of a cylindrical body 61f formed of a metal and an elastic member such as rubber interposed between the cylindrical body 61f and the bolt 64. Insulator 61g.

  The rod portion 61c is a metal rod formed integrally with both the cylinders 61d and 61f, and is formed in a shape that becomes thinner toward the rear of the vehicle. In addition, although not shown in the figure, a fragile portion that is fragile in the shearing direction may be formed in the middle of the rod portion 61c. The fragile portion can be formed by making a cut in the middle of the rod portion 61c or by reducing the plate thickness, and the weld strength of the welded portion between the rod portion 61c and the vehicle body side connecting portion 61b is higher than that of other portions. Also, it can be formed by setting it small.

  Furthermore, a moment generating means 65 is provided in the vehicle body side connecting portion 61b. This moment generating means 65 is constituted by an inclined surface 65a provided on the vehicle front side surface 61j of the inner peripheral surface 61h of the cylindrical body 61f that contacts the insulator 61g. That is, the inclined surface 65a is arranged in the vehicle front-rear direction so that the distance between the vehicle front side surface 61j and the vehicle front side surface 64c of the bolt 64 on the inner peripheral surface 61h of the cylinder 61f is narrower toward the vehicle upper side and wider toward the vehicle lower side. It is inclined to.

  The vehicle body side torque rod support bracket 48 includes an upper support plate 48a and a lower support plate 48b that are spaced apart from each other in the vehicle vertical direction and support the bolts 64. The lower support plate 48b is a contact support portion with which the rod portion 61c contacts when the upper torque rod 61 swings as will be described later. As shown in FIGS. Also, the plate thickness is increased and the strength is set high. A nut 64b is fastened to the bolt 64 on the lower surface of the lower support plate 48b.

  Next, the operation of the first embodiment will be described.

  Normally, when the power unit 3 rolls, the upper torque rod 61 and the lower torque rod 62 restrict the relative displacement between the power unit 3 and the front body 4 within a range in which the insulators 61e and 61g are elastically deformed. . At this time, the rod portion 61c of the upper torque rod 61 receives a load in the axial direction, that is, the vehicle longitudinal direction, and has sufficient strength against the load in the axial direction.

  Next, when an excessive load is input from the front of the vehicle to the rear of the vehicle, the load is input to the power unit 3 from the front of the vehicle, and further, the load is input from the power unit 3 to the front body 4 via both torque rods 61 and 62. Is done.

  At this time, in the vehicle body side connecting portion 61b of the upper torque rod 61, the insulator 61g is compressed by the load input from the front of the vehicle, and the vehicle front side of the bolt 64 from the vehicle front side surface 61j on the inner periphery of the cylinder 61f. A load is transmitted to the side surface 64c.

  Here, since the moment generating means 65 having the inclined surface 65a is provided between the vehicle front side surface 61j of the vehicle body side connecting portion 61b and the vehicle front side surface 64c of the bolt 64, the upper torque rod 61 When the load is transmitted to the bolt 64, the insulator 61g is compressed from the portion where the distance between the vehicle body side connecting portion 61b and the bolt 64 is narrow, and the reaction force of this portion increases. For this reason, in the vehicle body side connecting portion 61b, the direction in which the upper torque rod 61 is swung in the direction of narrowing the gap between the bolts 64, that is, in the direction of the axis 64a of the bolt 64 as the support shaft (FIG. 1). In the vehicle downward direction indicated by an arrow M in FIG.

  Accordingly, the upper torque rod 61 swings downward with respect to the bolt 64 in the vehicle. Further, when the torque rod 61 swings in this way and the rod portion 61c contacts the lower support plate 48b, a load acts in the shearing direction with this contact portion as a fulcrum, and the rod portion 61c is bent or broken. The

  Therefore, the upper torque rod 61 is not stretched between the power unit 3 and the bolt 64 on the front body 4 side, and the upper torque rod 61 does not prevent the power unit 3 from moving rearward of the vehicle.

  As described above, in the power unit mount structure of the first embodiment, the moment generating means 65 that generates a moment in the upper torque rod 61 when a load is input from the front surface of the vehicle is provided with the cylindrical body 61f of the vehicle body side connecting portion 61b of the upper torque rod 61. Provided on the inner peripheral surface 61h. For this reason, a layout space is secured on the outer periphery of the vehicle body side connecting portion 61b of the upper torque rod 61, or an unnecessarily large clearance is provided between the vehicle rear side end portion of the upper torque rod 61 and the vehicle body side torque rod support bracket 48. It is not necessary to secure the layout, and the layout flexibility can be improved. In addition, since the moment generating means 65 is provided in the portion constrained by the bolt 64, the moment can be reliably generated when a load is applied to the upper torque rod 61 in the rearward direction of the vehicle.

  In other words, conventionally, in order to ensure that the abutting portion and the receiving portion collide even if there is a variation in the load input direction from the front of the vehicle, it is necessary to increase the shape of both, and the connecting portion accordingly. The clearance required for the outer periphery was large. On the other hand, if this clearance is kept small, there is a risk that when the torque rod is displaced, the other part of the torque rod comes into contact with the vehicle body before the abutting part comes into contact with the receiving part and the desired moment cannot be generated. there were. On the other hand, in the first embodiment, it is possible to achieve both the improvement of the layout freedom by reducing the clearance and the generation of the moment with certainty.

  Further, in the first embodiment, in the vehicle body side torque rod support bracket 48, the strength of the lower support plate 48b is formed higher than that of the upper support plate 48a, so that it is possible to promote the bending or breaking of the rod portion 61c. Further, the cost and weight can be reduced as compared with the case where the upper and lower support plates 48a and 48b are formed to have this strength (plate thickness).

  Further, since the lower support plate 48b of the vehicle body side torque rod support bracket 48 that supports the upper torque rod 61 is used as an abutment support portion to be brought into contact when the upper torque rod 61 is swung, at the time of assembly. The relative position with respect to the upper torque rod 61 is surely set, and compared with the case where the upper torque rod 61 is brought into contact with other portions of the front body 4 when the upper torque rod 61 is swung, the assembly accuracy and the operational reliability are excellent.

  Next, a power unit mount structure according to Example 2 of the embodiment of the present invention will be described.

  Parts that are the same as or equivalent to those of the first embodiment are given the same reference numerals, and different parts will be mainly described.

  The power unit mount structure of the second embodiment is an example in which an operating surface 265b and a fulcrum surface 265c are provided as the moment generating means 265.

  That is, as shown in FIG. 5, the vehicle body side connecting portion 61b of the upper torque rod 261 has a support shaft as a support shaft on the inner peripheral surface 261h of the cylindrical body 261f that contacts the insulator 261g and below the vehicle front side surface 261j. An operating surface 265b in which the distance between the bolt 64 and the vehicle front side surface 64c is set relatively large, and a fulcrum surface 265c in which the distance between the bolt 64 and the vehicle front side surface 64c is set relatively smaller than the operating surface 265b. And a corner portion 265a is formed between both surfaces 265b and 265c based on a difference in distance from the bolt 64.

  In the second embodiment, the vehicle body side torque rod support bracket 248 has the same thickness as the upper support plate 48a and the lower support plate 248b.

  Next, the operation of the second embodiment will be described.

  When an excessive load is input from the front of the vehicle toward the rear of the vehicle and a load toward the rear of the vehicle is input to the upper torque rod 261, the vehicle body side connecting portion 261b first has an interval from the bolt 64. The insulator 261g is compressed by the narrow fulcrum surface 265c, and the reaction force of this portion increases. For this reason, in the vehicle body side connecting portion 261b, a moment is generated in which the upper torque rod 261 is swung in the direction in which the gap between the operating surface 265b and the bolt 64 is narrowed, that is, the vehicle downward direction indicated by the arrow M.

  Further, the corner portion 265a serves as an action point to assist the breaking of the upper torque rod 261.

  Next, a power unit mount structure according to Example 3 of the embodiment of the present invention will be described.

  Parts that are the same as or equivalent to those of the first embodiment are given the same reference numerals, and different parts will be mainly described.

  In the power unit mount structure of the third embodiment, when the upper torque rod 61 is swung by the moment generated by the moment generating means 65 on the front body 4 in the vicinity of the bolt 64 as the support shaft, This is an example in which flanges 348c and 348d are provided as contact support portions in contact with each other.

  That is, a vehicle downward flange 348c is provided at the vehicle front end portion of the upper support plate 348a of the vehicle body side torque rod support bracket 348 as a vehicle body in the vicinity of the bolt 64, and the vehicle upper end is provided at the vehicle front end portion of the lower support plate 348b. An orientation flange 348d is provided.

  Therefore, when the upper torque rod 61 swings in the direction of arrow M due to the moment generated by the moment generating means 65, the lower surface of the upper torque rod 61 abuts on the flange 348d, and this flange 348d serves as the point of action. It assists in breaking the torque rod 61.

  Furthermore, if the upper torque rod 61 swings in the direction opposite to the arrow M direction, that is, upward of the vehicle due to variations in the input direction of the load from the front of the vehicle, the upper torque rod 61 contacts the flange 348c. The flange 348c serves as an action point to assist the breaking of the upper torque rod 61.

  The embodiment of the present invention and each of Examples 1 to 3 have been described above in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment and each of Examples 1 to 3, and Design changes that do not depart from the gist of the invention are included in the present invention.

  That is, in the first to third embodiments, the moment generating means 65 and 265 are provided on the upper torque rods 61 and 261, but may be provided on other torque rods such as the lower torque rod 62.

  Further, in the first to third embodiments, the example in which the upper torque rods 61 and 261 are swung downward in the vehicle by the moment generating means 65 and 265 is shown. The moving direction may be a direction other than the direction shown in the embodiment according to the extending direction of the support shaft that supports the torque rod. For example, when the bolt 64 as the support shaft is provided in the vehicle width direction, a moment in the horizontal direction may be generated by the moment generating means, and the torque rod may be swung in the horizontal direction.

  In the first to third embodiments, the moment generating means 65 and 265 are provided on the vehicle body side connecting portions 61b and 261b of the upper torque rods 61 and 261. You may provide in the support shaft side.

  Further, in the first to third embodiments, the inclined surface 65a and the corner portion 265a are shown as the moment generating means. However, the present invention is not limited to this. A surface shape may be used, or a hemispherical protrusion such as a screw head may be provided. In short, the moment generating means gives a difference in the vehicle longitudinal distance between the torque rod side and the support shaft side, and when the torque rod receives a load input in the rearward direction of the vehicle, the torque rod swings in the support shaft direction. Any shape that generates a moment to be generated may be used.

  In the first embodiment or the third embodiment, when the torque rod (61, 216) swings due to the moment generated by the moment generating means (65, 265), the contact support portion that contacts the torque rod (61, 216). As shown, the lower support plate 48b and the flanges 348c and 348d are shown, but other parts of the front body 4 may be used as the contact support portion.

  Further, in order to make the lower support plate 48b as the contact support portion stronger than the upper support plate 48a, the first embodiment has shown an example in which the plate thickness is increased. A bead to raise may be formed, or a reinforcement may be added.

It is a side view which shows the vehicle body side connection part periphery which is the principal part of the power unit mount structure of Example 1 of embodiment of this invention. It is structure explanatory drawing seen from the vehicle upper side which shows the power unit mount structure of Example 1 of embodiment of this invention. It is structure explanatory drawing seen from the vehicle side which shows the power unit mount structure of Example 1 of embodiment of this invention. It is a perspective view which shows the upper torque rod 61 which is the principal part of the power unit mount structure of Example 1 of embodiment of this invention. It is a side view which shows the vehicle body side connection part periphery which is the principal part of the power unit mount structure of Example 2 of embodiment of this invention. It is a side view which shows the vehicle body side connection part periphery which is the principal part of the power unit mount structure of Example 3 of embodiment of this invention.

Explanation of symbols

3 Power unit 4 Front body
31 Mount part 32 Mount part 48 Car body side torque rod support bracket (vehicle body)
48a Upper support plate 48b Lower support plate (contact support part)
61 Upper torque rod 61b Vehicle body side connecting portion 61g Insulator 61h Inner peripheral surface 61j Vehicle front side surface 64 Bolt (support shaft)
64a Axle 64c Vehicle front side surface 65 Moment generating means 65a Inclined surface (moment generating means)
248 Torque rod support bracket on the vehicle body (vehicle body)
248b Lower support plate 261 Upper torque rod 261b Car body side connecting portion 261g Insulator 261h Inner peripheral surface 261j Vehicle front side surface 265 Moment generating means 265a Corner portion 265b Operating surface (moment generating means)
265c Support surface (moment generating means)
348 Car body side torque rod support bracket (vehicle body)
348a Upper support plate 348b Lower support plate 348c Flange (contact support portion)
348d Flange (contact support)

Claims (6)

A mount unit for supporting the vehicle power unit on the vehicle body;
A torque rod interposed between the power unit and the vehicle body and restricting the power unit to roll by a driving reaction force within a predetermined range;
A connecting portion provided on the torque rod and connected to a support shaft on the vehicle body side via an insulator;
A power unit mounting structure with
A power unit mount structure characterized in that moment generating means is provided between the support shaft and the connecting portion to generate a moment for breaking the torque rod by a load in the rearward direction of the vehicle. The support shaft extends in the torque rod extending direction,
2. The power unit mount structure according to claim 1, wherein the moment generating means generates a moment that swings around the support shaft on the torque rod. 3.   3. The power unit mount structure according to claim 1, wherein the moment generating means is an inclined surface that is provided on the vehicle front side of the inner periphery of the connecting portion and is inclined toward the support shaft.   The moment generating means has an operating surface provided at a lower portion of the inner periphery of the connecting portion on the vehicle front side, and a fulcrum surface formed closer to the support shaft than the operating surface. The power unit mount structure according to any one of claims 1 to 3.   The contact support portion that contacts the torque rod when the torque rod swings due to the moment generated by the moment generating means is provided on the vehicle body in the vicinity of the support shaft. 5. The power unit mount structure according to any one of 4 above. The vehicle body is provided with an upper support plate and a lower support plate that support the support shaft vertically.
6. The power unit mount structure according to claim 5, wherein one of the support plates is used as a contact support portion, and the support plate used as the contact support portion is set to have higher strength than the other support plate. .

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