JP6569264B2 - Mounting device for vehicle power unit - Google Patents

Description

  The present disclosure relates to a mounting device for a power unit for a vehicle that supports the power unit on a suspension cross member installed between left and right side frames.

  In a power unit for an automobile, as described in Patent Document 1, both left and right ends of the power unit are supported by a side frame via a front mounting device, and a rear portion of the power unit is suspended by a suspension cross via a rear mounting device. Some are supported by members.

  The rear mount device includes a mount bracket having a base end attached to and supported by the upper surface of the suspension cross member and extending upward, a power unit side bracket having a base end attached to and supported by the rear portion of the power unit and extending rearward of the vehicle body, and a mount bracket. And a cylindrical bush serving as a buffer member for connecting the tip of the power unit and the tip of the power unit side bracket. The cylindrical bush serving as the buffer member absorbs the load in the pitching direction from the power unit in particular.

JP 2000-108688 A

  In the mounting device as in Patent Document 1, when the vehicle collides front and a collision load is applied to the power unit from the front of the vehicle, the power unit moves to the vehicle rear side and the power unit side bracket and the cylindrical bush are pushed to the rear side. Therefore, the impact load is concentrated on the mounting bracket that supports the cylindrical bush. If the mount bracket cannot withstand an impact load and is deformed or broken rearward, the power unit may move to the vehicle compartment side and enter the vehicle compartment. Although it is possible to suppress deformation by increasing the rigidity of the mounting bracket to suppress the amount of power unit entering the passenger compartment, it is also necessary to increase the rigidity of the suspension cross member. And the weight increases. Further, if the rigidity of the mount bracket is too large, the suspension cross member may come off the side frame, and the suspension cross member may enter the vehicle compartment side together with the power plant, so there is room for improvement.

  In view of the above circumstances, an object of at least some embodiments of the present invention is to provide a power unit mounting device capable of suppressing movement of the power unit toward the passenger compartment at the time of a collision.

An engine mount mounting structure according to some embodiments of the present invention includes:
A mounting device for supporting a rear portion of a power unit on a suspension cross member extending between a pair of left and right front side frames extending along a longitudinal direction of a vehicle body, and is attached to the rear portion of the power unit and extends rearward. A power unit side bracket, a mounting bracket whose lower end is attached and supported on the upper surface of the suspension cross member, and extends upward, and a support shaft coupled to the upper end of the mounting bracket and extending in the vehicle width direction to the power unit side bracket The mounting bracket is fixed to the upper surface of the suspension cross member at the lower end, and the mounting position of the support shaft that connects the buffer member to the power unit side bracket. Below the center and forward Configured as configured to be positioned.

  According to the mounting apparatus for a vehicle power unit, the fixing position of the lower end portion of the mounting bracket to the suspension cross member side is located below and forward of the support center connecting the buffer member to the power unit side bracket. When a rearward collision load is applied, the mount bracket falls backward with the fixed position as a fulcrum, and a clockwise moment is applied to the buffer member. As a result, the power unit can be guided to be displaced obliquely downward to the rear of the vehicle, and the movement of the power unit toward the passenger compartment can be suppressed. Therefore, the mounting apparatus of the vehicle power unit which can suppress a movement to the cabin side of a power unit is realizable.

In some embodiments,
A support bracket provided on a rear side of the mount bracket and having an upper end coupled to a lower side and a rear side of the support shaft of the buffer member and a lower end coupled to a rear end edge of the suspension cross member; The support bracket is configured to bend and deform rearward when a predetermined load or more is applied toward the rear of the vehicle.

  In this case, the support bracket can reliably receive vibrations and the like input from the power unit in a normal state, and in the event of a collision, after receiving and reducing the load on the rear side, the support bracket is bent and deformed to lower the buffer member. The power unit can be reliably guided to the lower side. Accordingly, the synergistic effect with the mount bracket can more reliably displace the power unit rearward and obliquely downward, and can suppress movement toward the passenger compartment.

In some embodiments,
The support bracket is configured to be provided with a fragile portion that deforms when receiving a predetermined load or more toward the vehicle rear side and bends the support bracket to the rear side.

  In this case, it is possible to reliably and easily control the bending of the support bracket by providing the support bracket with a fragile portion.

In some embodiments,
The support bracket includes a lower bracket coupled to a rear edge portion of the suspension cross member, and an upper bracket coupled to an upper surface of the lower bracket and having an upper end coupled to the buffer member. Each of the bracket and the upper bracket is configured to be provided with the fragile portion.

  In this case, since each of the lower bracket and the upper bracket is provided with a fragile portion, the support bracket is bent backward in two stages, the buffer member can be pulled downward, and the power unit can be Can be guided even stronger.

In some embodiments,
The center of the support shaft is configured to be offset to a position above the center of the outer cylinder of the buffer member.

In this case, since the collision load acts on the buffer member at a position farther from the fixed position of the lower end portion of the mount bracket, the clockwise moment acting on the buffer member can be increased, so the power unit is moved downward. It is advantageous in guiding.

  According to at least some embodiments of the present invention, it is possible to provide a mounting device for a vehicle power unit capable of controlling the power unit downward in a collision and suppressing the movement of the power unit toward the passenger compartment.

1 is a perspective view of a vehicle front structure in which a rear mount device is provided in a power unit according to an embodiment of the present invention. It is a top view of the vehicle front part structure in which the rear part mounting apparatus was provided. It is a perspective view which shows the detailed structure of a rear part mounting apparatus. FIG. 4A is a side view showing a detailed structure of the rear mounting device, and FIG. 4B is a schematic diagram enlarging the periphery of the buffer member. It is a partial side perspective view of a rear mount device in which a weakened portion is provided on a support bracket.

  Embodiments of a power unit mounting apparatus according to the present invention will be described below with reference to FIGS. It should be noted that the materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention, but are merely illustrative examples.

  FIG. 1 is a perspective view of a vehicle front structure provided with a rear mount device for a power unit according to an embodiment of the present invention, and FIG. 2 is a plan view of the vehicle front structure provided with a rear mount device. . In the following description, the front-rear direction indicated by the arrows in FIG. First, before describing an embodiment of the present invention, a vehicle body front structure provided with a rear mount device will be outlined.

  As shown in FIG. 1 and FIG. 2, a vehicle compartment front region A at the front of the vehicle body has a pair of left and right side frames 1 extending in the vehicle front-rear direction with an interval in the vehicle width direction, The front end cross member 3 extending in the width direction, the suspension cross member 5 extending in the vehicle width direction behind the front end cross member 3, and the front end cross member 3 and the suspension cross member 5 extending in the front-rear direction of the vehicle are connected. A pair of left and right subframes 9L, 9R and the like are disposed.

  The pair of side frames 1 are members constituting the skeleton of the vehicle body, and are provided along the vehicle front-rear direction on both sides of a power unit 20 described later. Each of the pair of side frames 1 is formed in a rectangular tube shape having a rectangular cross section. The front end cross member 3 extends in the vehicle width direction below the front end portion of the vehicle, and both ends thereof are coupled to the front end portions of the left and right side frames 1 via brackets (not shown). The suspension cross member 5 is a member that supports the lower arms 11 </ b> L and 11 </ b> R of the front suspension. The suspension cross member 5 is disposed below the pair of side frames 1 on the rear side of the power unit 20 and is spanned between the pair of side frames 1. Note that lower arms 11L and 11R are supported at both left and right ends of the suspension cross member 5.

  The sub frames 9L and 9R are long rectangular tube-like members extending in the front-rear direction of the vehicle between the front end cross member 3 and the suspension cross member 5. Each of the sub-frames 9L and 9R has a front end located on the front side of the vehicle fixed to the front end cross member 3 and a rear end located on the rear side of the vehicle fixed to the suspension cross member 5. Lower arms 11L and 11R forming part of the front suspension are provided at both left and right ends of the suspension cross member 5.

  The power unit 20 including an engine and a transmission is elastically supported on the left and right side frames 1 by front mounting devices (not shown) at both ends in the width direction of the power unit 20 in a state where the engine is placed horizontally, and the rear part of the power unit 20 is The suspension cross member 5 is elastically supported by the rear mount device 30. The power unit 20 is not limited to an engine, and may be a drive motor such as an electric vehicle.

  next. The structure of the rear mounting device 30 according to the embodiment of the present invention will be described. As shown in FIGS. 3 and 4, the rear mount device 30 includes a power unit side bracket 31 that is attached to the rear portion of the power unit 20 and extends rearward, and a buffer that is pivotally supported by the rear end portion of the power unit side bracket 31. The upper end portion is coupled to the member 35, the mount bracket 40 whose upper end portion is coupled to the front lower portion of the buffer member 35 and the lower end portion is mounted and supported on the upper surface of the suspension cross member 5, and the upper end portion is coupled to the rear lower portion of the buffer member 35. And a support bracket 45 attached to and supported by the rear edge of the suspension cross member 5 at the lower end.

  The power unit side bracket 31 has a pair of supports that extend so that the width in the vertical direction becomes narrower for a while as it goes to the rear side in a side view, and extends rearward at a predetermined interval in the left-right vehicle width direction at the rear end portion. An arm portion 31a is formed. That is, the power unit side bracket 31 is formed in a bifurcated manner by the pair of support arm portions 31a. The buffer member 35 is supported in a gap 31b formed between the support arm portions 31a. The rear ends of the pair of support arm portions 31 a extend above the upper surface 5 a of the suspension cross member 5.

  The buffer member 35 includes a cylindrical outer cylinder 36 having a central axis 36a (see FIG. 4B) extending in the vehicle body width direction, and a cylinder disposed in the outer cylinder 36 in a non-contact state with the outer cylinder 36. And an elastic material 38 such as rubber which is interposed between the outer cylinder 36 and the inner cylinder 37 and integrally couples the outer cylinder 36 and the inner cylinder 37.

  The buffer member 35 is disposed between the pair of open support arm portions 31a, and the support shaft 39 extending in the vehicle body width direction between the rear end portions of the pair of support arm portions 31a is inserted into the inner cylinder 37. It is supported by the shaft. That is, the buffer member 35 is connected to the support arm portion 31 a via the support shaft 39.

  Here, as shown in FIG. 4B, in the side view of the buffer member 35, the center of the support shaft 39 on which the buffer member 35 is supported (hereinafter referred to as “support center Sm”) is the buffer member 35. It is located above the central axis 36a of the (outer cylinder 36). That is, the inner cylinder 37 through which the support shaft 39 is inserted is disposed in a state offset upward with respect to the central axis 36 a of the outer cylinder 36, and the input from the power unit 20 is input above the central axis 36 a of the buffer member 35. It is supposed to have a structure to receive.

  The mount bracket 40 is a member that supports the buffer member 35 on the suspension cross member 5. As shown in FIGS. 3 and 4, the mount bracket 40 has an upper end coupled to the lower part of the outer peripheral surface of the outer cylinder 36 of the buffer member 35, and a lower end attached to and supported by the upper surface 5 a of the suspension cross member 5. . The mount bracket 40 has a bottom plate portion 40a extending along the upper surface 5a of the suspension cross member 5, and a pair of side plate portions 40b extending upward from the front end and the rear end of the bottom plate portion 40a, and is formed in a U shape. Extending in the vehicle body width direction. Bolts 41 are inserted into the bottom plate portion 40a and fastened and fixed to the upper surface 5a of the suspension cross member 5.

  The mount bracket 40 is fixed to the outer peripheral surface of the outer cylinder 36 at the lower end and the front side of the support center Sm where the buffer member 35 is coupled to the power unit side bracket 31 in the side view, and the suspension cross at the lower end portion. The fixing position Pf fixed to the upper surface 5a of the member 5 is located below and forward of the support center Sm. That is, when a collision load F on the rear side of the vehicle acts on the buffer member 35, the mount bracket 40 tends to tilt backward with the fixed position Pf on the suspension cross member 5 side as a fulcrum, that is, the buffer member 35. The structure is such that a clockwise moment M is induced around the fixed position Pf.

  The support bracket 45 is a member that supports the mount bracket 40 by supporting the rear side of the buffer member 35. As shown in FIGS. 3 and 4, the support bracket 45 has an upper end connected to the rear side of the outer peripheral surface of the outer cylinder 36 of the buffer member 35 on the rear side of the mount bracket 40, and a lower end connected to the suspension cross member 5. It is connected. More specifically, the support bracket 45 is fixed to the outer peripheral surface of the outer cylinder 36 so that the upper end portion is on the rear side and the lower side with respect to the support center Sm of the buffer member 35 in the side view, and the lower end portion is the suspension cross. The rear end edge of the member 5 is connected. The support bracket 45 includes a lower bracket 46 coupled to the rear end edge of the suspension cross member 5, and an upper bracket 49 coupled to the upper surface of the lower bracket 46 and extending upward and having an upper end coupled to the buffer member 35. It is equipped with.

  The lower bracket 46 is in contact with the rear side surface 5b at the rear end edge of the suspension cross member 5, and the latching portion 49a protruding from the upper part to the front side is latched on the upper surface 5a of the suspension cross member 5. Thus, the suspension cross member 5 is fixed by welding.

  The upper bracket 49 is connected to the lower bracket 46 on the upper surface of the lower bracket 46 via fastening means such as a bolt (not shown) and is formed in a box shape extending upward. A curved surface 49 b fixed in a state of surface contact along the outer peripheral surface of the buffer member 35 is provided on the upper front side of the upper bracket 49. The curved surface 49b is welded and integrated with the outer peripheral surface of the buffer member 35 by welding or the like. Therefore, the upper bracket 49 is fixed to the suspension cross member 5 via the lower bracket 46. In addition, the connection part of the lower bracket 46 and the upper bracket 49 is comprised so that connection may be cancelled | released at the time of a collision.

  When the upper bracket 49 and the lower bracket 46 of the support bracket 45 receive a predetermined load or more to the rear side via the buffer member 35 as shown in FIG. Vulnerable portions 55 and 56 that are bent backward are provided. That is, the support bracket 45 is set to bend and deform backward when receiving a predetermined load or more toward the rear. The fragile portions 55 and 56 are, for example, notches provided in a direction orthogonal to the rear end surfaces of the left and right side surfaces of the upper bracket 49 and the lower bracket 46. The weakened portion 55 provided in the upper bracket 49 is formed so as to extend upward as it proceeds to the rear side in a side view in the left-right direction of the upper bracket 49. Further, the fragile portion 56 provided in the lower bracket 46 is formed to extend downward as it proceeds to the rear side in the lateral view of the lower bracket 46.

  Thus, the support bracket 45 normally supports the mount bracket 40 to support the buffer member 35, and when a predetermined load or more acts on the support bracket 45 toward the vehicle rear side, the fragile portions 55 and 56 are The support bracket 45 is deformed and bent backward in two stages. As a result, the support bracket 45 normally supports the input by vibration of the power unit 20 together with the mount bracket 40, and at the time of collision, the support bracket 45 bends backward when the load exceeds a predetermined value and lowers the cushioning member 35. By pulling in the side, the power unit 20 can be induced to generate a downward moment.

  In addition, the connection part of the lower bracket 46 and the upper bracket 49 is comprised so that mutual connection may be cancelled | released after the weak parts 55 and 56 deform | transform. Thereby, after the support bracket 45 pulls the power unit 20 downward, it can be smoothly displaced downward.

  Next, the effect of the rear mounting device 30 of this embodiment will be described with reference to FIG.

  For example, when the vehicle collides front, the power unit 20 is pushed rearward by the collision load F directed from the front of the vehicle body to the rear side of the vehicle body, and the buffer member 35 is pushed rearward via the power unit side bracket 31.

  When the buffer member 35 is pushed rearward, the mount bracket 40 and the support bracket 45 are pushed rearward and start to deform. Since the mount bracket 40 is coupled to the front side from the support center Sm of the buffer member 35 and the fixing position Pf on the suspension cross member 5 side of the lower end part is set to the lower side and the front side from the support center Sm. It tries to fall backward with the fixed position Pf as a fulcrum. Therefore, a clockwise moment M about the fixed position Pf is generated in the buffer member 35. At this time, since the support center Sm of the buffer member 35 is offset above the center axis 36a of the outer cylinder 36, the buffer member 35 receives a load at a position further away from the fixed position Pf. Therefore, the clockwise moment M is more strongly applied.

  And when the load to the vehicle rear side which acts on the support bracket 45 becomes more than predetermined, the weak parts 55 and 56 deform | transform, and the upper bracket 49 and the lower bracket 46 of the support bracket 45 become weak parts 55 and 56. Turn back at.

  When the support bracket 45 is bent backward, the buffer member 35 is pulled downward by the support bracket 45. At the same time, since the support on the rear side of the buffer member 35 is lost, the mount bracket 40 falls backward with the fixed position Pf as a fulcrum, and the buffer member 35 is also pulled downward by the mount bracket 40. That is, the buffer member 35 is pulled downward by both the mount bracket 40 and the support bracket 45, and the buffer member 35 is displaced obliquely downward and rearward of the vehicle. In the present embodiment, since the support bracket 45 is bent backward in two stages by the fragile portions 55 and 56, the displacement direction of the buffer member 35 can be directed further downward.

  As a result, a downward moment is induced in the power unit 20 via the power unit side bracket 31, and the power unit 20 is displaced (moved) obliquely downward and rearward of the vehicle. When the power unit 20 is displaced obliquely downward to the rear of the vehicle, the suspension cross member 5 is also pushed by the power unit 20 and displaced downward. Thereby, the movement of the power unit 20 and the suspension cross member 5 to the rear side, that is, the passenger compartment side can be suppressed, and the amount of intrusion into the passenger compartment side can be suppressed.

  In the present embodiment, when the support bracket 45 is bent by the deformation of the fragile portions 55 and 56, the connection between the upper bracket 49 and the lower bracket 46 is released, and the downward displacement of the power unit 20 causes the support bracket 45 to be displaced downward. Since it becomes the structure which is not obstructed by 45, the movement to the compartment side can be suppressed more efficiently.

  As described above, in the rear mount device 30 of the present embodiment, the fixing position Pf of the lower end portion of the mount bracket 40 that supports the buffer member 35 to the suspension cross member 5 side is the support that connects the buffer member 35 to the power unit side bracket 31. Since it is located on the lower side and the front side than the center Sm, the mount bracket 40 falls to the rear side with the fixed position Pf as a fulcrum when a collision load is applied to the rear side, and a clockwise moment is applied to the buffer member 35. M can be generated. As a result, the power unit 20 can be guided to be displaced obliquely downward rearward of the vehicle. That is, by controlling the power unit 20 moving rearward by the mount bracket 40 to the lower side, the movement of the power unit 20 toward the passenger compartment side, that is, the amount of intrusion into the passenger compartment side can be suppressed.

  In addition, since the upper end portion of the mount bracket 40 is coupled to the lower portion of the buffer member 35 on the front side of the support center Sm, the clockwise moment M with respect to the buffer member 35 can be further increased. Further, the support center Sm where the buffer member 35 is supported by the power unit side bracket 31 is offset upward from the center axis 36a of the outer cylinder 36 and collides with the buffer member 35 at a position farther from the fixed position Pf of the mount bracket 40. Since the load is applied, the clockwise moment M can be further increased.

  In addition, a support bracket 45 for supporting the buffer member 35 on the suspension cross member 5 is provided behind the mount bracket 40, and when the support bracket 45 receives a predetermined load or more toward the vehicle rear side, it is bent and deformed rearward. It is configured to do. Thereby, it is possible to reliably support the vibration from the power unit 20 in the normal state, and in the event of a collision, the shock absorbing member 35 is pulled downward by being deformed after receiving and reducing the load on the rear side, The power unit 20 can be reliably guided downward. That is, in addition to the downward pulling force due to the tilt of the mount bracket 40 to the buffer member 35, the downward pulling force due to the bending of the support bracket 45 is applied, thereby guiding the power unit 20 more strongly downward. can do. As a result, the movement of the power unit 20 toward the passenger compartment can be more reliably suppressed.

  Further, since the upper bracket 49 and the lower bracket 46 of the support bracket 45 are provided with fragile portions 55 and 56 that are deformed by a collision load exceeding a predetermined value, the support bracket 45 can be easily bent rearward during a collision. Moreover, it is easy to control the bending state and the bending timing. Further, since the support bracket 45 is bent at two locations of the fragile portions 55, 56, that is, bent backward in two stages, the buffer member 35 can be retracted to be displaced further downward, and the power unit 20 can be It can be guided downward. Therefore, it is more advantageous in suppressing the rearward movement of the power unit 20.

  Further, the lower bracket 46 and the upper bracket 49 are configured to be disconnected from each other after the fragile portions 55 and 56 are deformed and the support bracket 45 is bent rearward. As a result, the power unit 20 and the support bracket 45 are separated from each other. Therefore, the support bracket 45 does not interfere with the downward displacement of the power unit 20 and can further promote the downward movement.

  As described above, with the rear mounting device 30 of the present invention, the power unit 20 can be guided downward in the event of a collision to suppress movement toward the vehicle rear side, that is, the passenger compartment side.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the object of the present invention.

  For example, in the present embodiment, the mount bracket 40 and the support bracket 45 are provided, but even with only the mount bracket 40, the effect of the present invention can be obtained. Moreover, although the weak parts 55 and 56 are each provided in the lower bracket 46 and the upper bracket 49, they should just be provided in at least any one. The lower bracket 46 and the upper bracket 49 are connected to each other by breaking after the upper bracket 49 and the lower bracket 46 are bent rearward at the fragile portions 55 and 56, and fixing the upper bracket 49 and the lower bracket 46. May be configured to be released. In this case, since the connection between the support bracket 45 and the suspension cross member 5 is released, the displacement of the power unit 20 to the lower side is further promoted, which is effective.

DESCRIPTION OF SYMBOLS 1 Side frame 3 Front end cross member 5 Suspension cross member 5a Upper surface 5b Side surface 9L, 9R Sub-frame 11L, 11R Lower arm 20 Power unit 30 Rear mounting device 31 Power unit side bracket 31a Support arm part 31b Gap 35 Buffer member 36 Outer cylinder 36a Center axis 37 inner cylinder 38 elastic material 39 support shaft 40 mount bracket 40a bottom plate portion 40b side plate portion 41 bolt 45 support bracket 46 lower bracket 49 upper bracket 49a hooking portion 49b curved surface 55, 56 vulnerable portion A vehicle compartment front region F collision load K Car compartment Pb, Pf Fixed position Sm Support center

Claims (4)

A mounting device for supporting a rear portion of a power unit on a suspension cross member constructed between a pair of left and right front side frames extending along a longitudinal direction of a vehicle body,
A power unit side bracket attached to the rear portion of the power unit and extending rearward;
A mounting bracket whose lower end is mounted and supported on the upper surface of the suspension cross member and extends upward;
A buffer member coupled to the upper end of the mount bracket and coupled to the power unit side bracket via a support shaft extending in the vehicle width direction;
A support bracket provided on a rear side of the mount bracket, an upper end portion coupled to a lower side and a rear side than the support shaft of the buffer member, and a lower end portion coupled to a rear end edge of the suspension cross member; With
The mounting bracket is fixed at a lower end of the suspension cross member at a fixed position on a lower side and a front side than a center of the support shaft connecting the buffer member to the power unit side bracket ,
The power bracket mounting device for a vehicle , wherein the support bracket is configured to bend and deform rearward when a predetermined load or more is applied toward the rear of the vehicle. It said support bracket deforms when subjected to a predetermined load or greater toward the vehicle rear side, according to claim 1, wherein a weak portion that bends the support bracket to the rear side is provided Mounting device for vehicle power unit. The support bracket includes a lower bracket coupled to a rear edge portion of the suspension cross member, and an upper bracket coupled to an upper surface of the lower bracket and having an upper end coupled to the buffer member.
The mounting device for a vehicle power unit according to claim 2 , wherein the weakened portion is provided on each of the lower bracket and the upper bracket. The mounting device for a vehicle power unit according to any one of claims 1 to 3 , wherein the center of the support shaft is offset to a position above the center of the outer cylinder of the buffer member.

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