JP2005119554A - Suspension support device for vehicle - Google Patents

Abstract

The present invention efficiently absorbs vibrations from a power unit and absorbs impacts from a power unit without impairing the impact absorption performance of an existing vehicle body structure at the time of a vehicle collision.
A mounting bracket 30 for supporting a power unit is erected obliquely upward from a base 2 of a cross member main body, and the power unit is fastened and supported to one of two side plates 31 and 31 facing each other at a predetermined interval. A nut 32 having a function as a damping mass for suppressing vibration of the power unit is fixed, and a crushing bead 31 a is formed on the base side of each side plate 31. As a result, during normal operation, vibration from the power unit is efficiently absorbed, while in the frontal collision of the vehicle, the crushing beat 31 receives a shock from the power unit without impairing the impact absorption performance of the existing vehicle body structure. This can contribute to the improvement of the impact absorption performance of the vehicle as a whole.
[Selection] Figure 3

Description

  The present invention relates to a suspension support device for a vehicle provided with a mount bracket for supporting a power unit.

  In general, a power unit of a vehicle such as an automobile is mounted with a three-point or four-point support at a location where the rigidity of the vehicle body is high for reasons such as vibration absorption. For example, when mounting the power unit with three-point support, the power unit is supported by a pair of side frames arranged on the left and right sides of the vehicle body and a suspension cross member laid between the side frames. Such an example is disclosed in Patent Document 1, for example.

In Patent Document 1, a power unit including an engine and a transmission is supported on left and right side frames via front engine mounts, supported on a suspension cross member by a rear engine mount, and further spanned between a front cross member. By providing a dynamic damper on the center member, the vibration of the frame structure that supports the power unit is damped in a balanced manner.
JP 2000-120770 A

  However, the conventional mounting bracket for mounting the power unit has high strength and rigidity because it must absorb the vibration of the engine etc., and the fixed part of the mounting bracket is difficult to collapse in the event of a vehicle collision. Therefore, there is a problem of impeding the impact absorption performance of the existing vehicle body structure.

  The present invention has been made in view of the above circumstances, and can efficiently absorb vibrations from the power unit, and can also absorb the impact from the power unit without impairing the impact absorbing performance of the existing vehicle body structure at the time of a vehicle collision. An object of the present invention is to provide a suspension support device for a vehicle.

  In order to achieve the above object, a vehicle suspension support apparatus according to the present invention is a vehicle suspension support apparatus in which a cross member that supports a suspension arm is provided with a mount bracket that supports a power unit. A crushing bead that crushes in a backward direction by an impact from the power unit at the time of collision is provided.

  At that time, it is desirable to fasten the support end of the power unit to the mount bracket via a bolt, and to fix a nut serving as a damping mass for suppressing vibration transmitted from the power unit. When the second mount bracket for supporting the steering gear box is provided on the member, the second mount bracket is crushed in the backward direction by an impact transmitted from the power unit to the steering gear box when a vehicle collides. It is desirable to provide a bead for use. Further, the mount bracket for supporting the power unit is preferably applied to a horizontally disposed power unit in which an engine body and a transmission coupled to the engine body are disposed in the engine width direction in the vehicle width direction.

  The suspension support device for a vehicle according to the present invention efficiently absorbs vibration from the power unit by the crushing bead provided on the mount bracket, and from the power unit without impairing the impact absorption performance of the existing vehicle body structure at the time of vehicle collision. An impact can be absorbed efficiently and it can contribute to the improvement of the impact absorption performance as the whole vehicle.

  Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 relate to an embodiment of the present invention, FIG. 1 is an explanatory view showing a layout around a cross member, FIG. 2 is a plan view of a cross member main body, FIG. 3 is a perspective view of a mounting bracket, FIG. These are explanatory drawings which show the mounting state of a power unit.

  First, the layout around the cross member that supports the front suspension of the vehicle will be described with reference to FIGS. In these drawings, reference numeral 1 denotes a cross member body in which a plurality of sheet metal members are joined to form a box cross-sectional structure. The cross member body is disposed in the lower part of the engine chamber and supports the suspension with high rigidity. It has an impact absorbing structure that absorbs impact by crushing at a predetermined location at the time of frontal collision.

  The cross member main body 1 includes a base portion 2 extending in the left-right direction of the vehicle body, a bilaterally symmetric support portion 3 provided on both sides of the base portion 2 and extending in the vehicle body front-rear direction, and a vehicle body front side of each support portion 3. It has left and right raised portions 4 raised upward from the end portions, and is provided with a cylindrical stay 5 standing at the tip of each raised portion 4 and on the rear end side of each support portion 3. The frame structure on the side of the vehicle body is formed at the front and rear three positions with the mounting holes 3a and 3b, and a total of six positions on the left and right sides, and attached to a side frame (not shown) that is bent and extended inward at the front of the vehicle body. It has been.

  The left and right support portions 3 of the cross member main body 1 are slightly curved in the vehicle body center direction and opened in the vehicle body front direction. The portions extending from the support portion 3 to the raised portion 4 and the left and right sides of the base portion 2 are A suspension arm 6 connected to a suspension member such as a strut suspension is supported at two points before and after the portion reaching the support portion 3.

  The front support end of each suspension arm 6 is supported substantially in the front-rear direction of the vehicle body, and a bolt is inserted into a cylindrical bush 7 in which an elastic material such as damping rubber is fitted. It is attached by fastening to the installed welding nut. Further, the rear support end of the suspension arm 6 is supported in a substantially vertical direction of the vehicle body, and is disposed between two members constituting the cross member main body 1 (also an elastic material such as vibration damping rubber). Is attached by inserting a bolt into a cylindrical bushing fitted inside and fastening it to a welding nut 9 fixed to the upper surface of the cross member main body 1.

  In addition, a tubular support arm 10 is suspended in front openings of the left and right support portions 3 to increase the lateral rigidity of the support portions on the front side of the suspension arms 6 and improve steering stability. A mass 11 is fixed to the support arm 10 for suppressing the influence of vibrations of the engine and the vehicle body. Further, a stabilizer 12 for increasing the roll rigidity of the vehicle body is attached to a portion inside the welding nut 9 from the base portion 2 to the left and right support portions 3 via left and right brackets 13. Is connected to a suspension member such as a strut damper via a link (not shown).

  On the other hand, the base portion 2 of the cross member main body 1 is formed in a bridge shape that is slightly raised with respect to the left and right support portions 3, and comprises an engine 51 and a transmission 52 slightly to the left of the center of the bridge-shaped portion. A mount bracket 30 that supports the power unit 50 is erected. In this embodiment, the engine 51 is disposed horizontally in the vehicle width direction in front of the driver's seat, and the transmission 52 is integrally coupled to the left side of the engine 51 (passenger seat side).

  Further, the left and right tie rods 61 are amplified by amplifying the steering force from the steering shaft 60 to a left side portion close to the mount bracket 30 and a portion located at a predetermined distance from the mount bracket 30 and located inside the steering shaft 60. Two mount brackets 41 and 42 are provided upright to support a steering gear box 62 that transmits to the wheels via the wheel.

  As shown in FIGS. 2 and 3, the mounting bracket 30 that supports the power unit 50 has a substantially U-shaped member standing obliquely upward from the base 2 of the cross member main body 1 with the opening side of the mounting bracket 30 in front of the vehicle. A nut 32 for fastening and supporting the power unit 50 via a bolt is fixed to one of the two side plates 31 and 31 facing each other at a predetermined interval. That is, as shown in FIG. 4, a cylindrical bush 54 fitted with an elastic material such as vibration damping rubber provided at the tip of a bracket 53 extending from the power unit 50 is used as a side plate 31 of the mount bracket 30. The power unit 50 is supported by the cross member main body 1 by inserting the bolt 55 and fastening it to the nut 32.

  The front portion of the power unit 50 is supported by the mount bracket 30 and, for example, two left and right portions are supported by side frames forming a vehicle body skeleton structure, and are mounted on the vehicle body by three-point support.

  The nut 32 fixed to the mount bracket 30 is fixed to the side plate 31 positioned on the engine 51 side as a relatively heavy large nut, and not only functions for fastening but also the mass of the nut 32. Therefore, it has a function as a damping mass for suppressing vibration of the power unit 50. That is, the mass 11 fixed to the support arm 10 described above improves the damping function against vibrations input via the suspension arm 6, and the mass of the nut 32 fixed to the mount bracket 30 allows the power unit 50 to The damping function for the input vibration is improved.

  In addition, on the base side of each side plate 31 of the mount bracket 30, a crushing bead 31 a is formed for receiving an impact from the power unit 50 and collapsing in the backward direction and absorbing the impact when the vehicle collides with the front. The crushing bead 31a absorbs energy by collapsing in the backward direction due to an impact from the front at the time of collision while securing rigidity against vibration from the power unit 50. It is formed as a bead protruding in a convex shape, and in this embodiment, the protruding width is formed so as to become narrower toward the base 2 side.

  Further, the mounting bracket 41 that supports the steering gear box 62 on the transmission 52 side includes a crushing bead 41 a having the same shape as the crushing bead 31 a as a second mounting bracket having the same function as the mounting bracket 30. Yes. In this embodiment, the engine 51 and the mounting bracket 42 have a larger shock absorption stroke than the transmission 52 and the mounting bracket 41. Therefore, the steering gear box 62 is installed on the engine 51 side. The mounting bracket 42 to be supported is not provided with a crushing bead.

  The mount brackets 30 and 41 are crushed in the backward direction and the load leading to the crushing includes the volume and the center of gravity of the power unit 50 system including the engine 51 and the transmission 52, the volume and the center of gravity of the steering gear box 62 system, Further, it is determined by experiment or simulation in consideration of the rigidity and shock absorption characteristics of the cross member main body 1, and is tuned to an optimum shape and plate thickness.

  In particular, the mounting bracket 30 that supports the power unit 50 sets the plate thickness and shape of the mounting bracket 30 including the crushing bead 31a in consideration of the damping effect of the mass of the nut 32 fixed to the side plate 31, and is rigid. Both securing and vibration suppression are improved.

  Thus, during normal operation, the rigidity required to support the power unit 50 and the steering gear box 62 can be ensured and vibration can be effectively suppressed. Even in the event of a frontal collision of the vehicle, the mount bracket 30 , 41 is crushed in the reverse direction, the impact from the main structure of the power unit 50, that is, the engine 51, the transmission 52, the oil pan 52a of the transmission 52, etc. as shown in FIG. Absorbing without impairing the absorbing performance, it can contribute to the improvement of the impact absorbing performance of the entire vehicle.

Explanatory drawing showing the layout around the cross member Plan view of the cross member body Perspective view of mounting bracket Explanatory drawing showing the mounted state of the power unit

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cross member main body 6 Suspension arm 30 Mount bracket 31a Crush bead 32 Nut 41 Mount bracket 41a Crush bead 50 Power unit 51 Engine 52 Transmission 62 Steering gear box
Agent Patent Attorney Susumu Ito

Claims (4)

A suspension support device for a vehicle in which a mount bracket for supporting a power unit is provided on a cross member for supporting a suspension arm,
A suspension support device for a vehicle, wherein the mount bracket is provided with a crushing bead that is crushed in a backward direction by an impact from the power unit when the vehicle collides.   2. The nut according to claim 1, wherein a nut serving as a damping mass for suppressing vibration transmitted from the power unit is fixed to the mount bracket while fastening the support end of the power unit via a bolt. Vehicle suspension support device. The cross member is provided with a second mounting bracket for supporting the steering gear box,
3. The vehicle according to claim 1, wherein the second mounting bracket is provided with a crushing bead that is crushed in a backward direction by an impact transmitted from the power unit to the steering gear box in the event of a vehicle collision. Suspension support device.   The power unit according to claim 1, 2, or 3, wherein the power unit is a horizontally placed power unit in which an engine main body and a transmission connected to the engine main body are arranged in the vehicle width direction in the engine chamber. The suspension support device for a vehicle according to any one of the above.

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