JP2013241089A - Vehicle front body structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce annoying road noise to be generated by traveling vibration input from a front suspension mechanism to a front side frame.SOLUTION: A gate-like reinforcing member 70 is provided which has a leg part 72 joined to a front side frame 10 near a support part of a lower frame 46 of a front suspension mechanism.

Description

  The present invention relates to a vehicle body front structure of an automobile, and more particularly, to a vehicle body front structure of a type of automobile in which a damper housing is joined to a front side frame and a front side frame includes a support portion of a front suspension mechanism arm. .

  As a vehicle body front structure, the left and right front side frames that extend in the longitudinal direction of the vehicle body and include the support portions of the front suspension mechanism arms (lower arms), and the left and right front side frames are joined to the outside in the vehicle width direction. And a left and right damper housing for housing the front suspension mechanism damper, and a dashboard panel that is joined to the left and right front side frames and separates the engine room in front of the vehicle body and the vehicle compartment in the rear of the vehicle body from the engine room. There are things.

  In the vehicle body front structure having such a configuration, the front side frame supports the lower arm of the front suspension mechanism via the mechanism support member. Therefore, traveling vibration of the vehicle is mainly input from the front side frame to the vehicle body, and the front side frame is vibrated by the vibration. The vibration of the front side frame is transmitted to the members joined to the frame, especially the dashboard lower panel below the dashboard upper member (cowl top member), and also the surface shape of the floor panel, front windshield glass, etc. When the surface members are transmitted to the members and vibrate, the vehicle interior noise called road noise is generated.

  Especially when driving on rough roads, vibrations in the top, bottom, left and right and front and rear directions are input to the front side frame, especially low and medium frequency (about 100 to 500 Hz) vibrations. Since the noise which gives an unpleasant feeling generate | occur | produces in a vehicle interior, it has become a subject when improving this, suppressing this.

  In order to reduce such vehicle interior noise when the vehicle is running, elastically close to the vehicle side member such as the wheel house upper member and the front pillar joined to the end of the cowl top member in the vehicle width direction. A technique for providing a bead serving as a bending point is known (for example, Patent Document 1).

  In this technique, vibration is transmitted from the vehicle body side member to the cowl top member by suppressing the elastic bending of the bead and transmitted from the vehicle body side member to the dashboard panel via the cowl top member. Vibration can be suppressed.

JP 2010-228718 A

  However, in the related art as described above, transmission of vibration on a specific vibration transmission path including the cowl top member can be blocked by the bead, but the dashboard panel has a wheel house disposed on the side of the vehicle body. In addition to the upper member, vibration is also input from the front side frame and the like, and vibration transmission cannot be interrupted for such a vibration transmission path that does not pass through the bead. However, the vibration input itself from the front suspension mechanism to the vehicle body cannot be blocked.

  In addition, even if a bead is provided, the state where the steel plate cowl top member is connected to the vehicle body side member remains unchanged, and vibration energy is transmitted except for a specific frequency. Cannot be reduced sufficiently.

  The problem to be solved by the present invention is that the problem to be solved by the present invention is that an uncomfortable vehicle caused by running vibration input to the vehicle body from the front suspension mechanism support part including the front side frame. It is to reduce indoor noise (road noise).

  The vehicle body front structure according to the present invention includes left and right front side frames (10) extending in the longitudinal direction of the vehicle body and including support portions of arms (46) of a front suspension mechanism, and the left and right front side frames (10). The left and right damper housings (26) for receiving the front suspension mechanism damper (54) and the left and right front side frames (10) and the engine room (22) on the front side of the vehicle body and the engine A vehicle body front structure having a dashboard panel (20, 98) separating a vehicle compartment (24) on the rear side of the vehicle body from a room (22), the left and right leg portions (72), and the vehicle body width direction A truss structure with a cross beam portion (74) connecting the upper portions of the left and right leg portions (72) to each other, and the leg portion (72) and the cross beam portion (74). The left and right leg portions (72) each have a lower end portion of the arm (46) of the front suspension mechanism. In the vicinity of the support portion, it is joined to the left and right front side frames (10), and extends vertically along the wall surface of the left and right damper housing (26) on the engine room (22) side and joined to the wall surface. ing.

  According to this configuration, the rigidity of the vehicle body front structure described above is increased. As a result, when the vehicle travels on a rough road surface, vibration energy input from the suspension arm to the vehicle body side is reduced, and at the same time, the front side frame (10) is suppressed from vibrating in the vertical, horizontal, and front-rear directions. The vibration transmitted to the planar members such as the panels (20, 98), the floor panel, and the front windshield glass can be reduced and the vibrations of these planar members can be suppressed. Certain low and medium frequency road noise is reduced.

  In the vehicle body front structure according to the present invention, preferably, the transverse beam portion (74) has a rectangular closed cross-sectional shape, and the leg portion (72) has a U-shaped cross-sectional shape so that the damper housing (26) A rectangular closed cross-sectional shape is formed in cooperation with the wall surface.

According to this configuration, the portal reinforcing member (70) becomes a highly rigid reinforcing member, and the rigidity of the front portion of the vehicle body including the damper housing (26) can be increased, so that the support rigidity of the front suspension mechanism is improved. In addition, vibration control is suppressed, and at the same time, vehicle handling stability is improved.

  In the vehicle body front part structure according to the present invention, the transverse beam part (74) is preferably fixed to the dashboard panel (20, 98).

  According to this configuration, the support rigidity of the dashboard panel (20, 98) is increased, and the dashboard panel (20, 98) is less likely to vibrate. This also reduces low and medium frequency road noise.

  The vehicle body front structure according to the present invention preferably further includes a connecting member extending along a lower edge of the horizontal beam portion and fixed to the horizontal beam portion, and the inclined support portion of the inclined support portion is connected to the connecting member. The upper part is fixed, the inclined support part is fixed to the transverse beam part via the connecting member, and the transverse beam part is fixed to the dashboard panel via the connecting member.

  According to this configuration, the inclined support member (88) functions as a brace that further reinforces the portal reinforcing member (70), the rigidity of the vehicle body including the damper housing (26), and the dashboard panel. The support rigidity of (20, 98) is also effectively improved. Therefore, it is effective in reducing low and medium frequency road noise and improving steering stability.

  The vehicle body front structure according to the present invention preferably further extends in the vehicle width direction with two left and right vertical members (32) extending in the vehicle longitudinal direction below the left and right front side frames (10). The vertical members (32) are formed in a substantially rectangular shape in plan view by the two front and rear horizontal members (34, 36) that connect the front ends of the vertical members (32) and the rear ends or the vicinity of the rear ends. The subframe (30) supports a lower arm (46) of a front suspension mechanism, and the leg (72) of the portal-shaped reinforcing member (70) and the front side frame (30) have a subframe (30). 10) and a joint portion to the front side frame is provided below the joint portion.

  According to this configuration, in the vehicle body front portion structure having the subframe (30), the rigidity of the vehicle body front portion with the subframe supporting the suspension mechanism attached to the vehicle body is increased by the effect of the gate-shaped member (70). Therefore, it is possible to reduce low and medium frequency road noise and improve steering stability.

  In the vehicle body front structure according to the present invention, preferably, the inclined support portion (88) is offset from the leg portion (72) at the rear of the vehicle body.

  According to this configuration, the inclined support portion (88) can be prevented from interfering with the intake pipe (112) of the internal combustion engine (110) disposed in the engine room (22), and the vehicle body front portion can be reduced in size. Can be achieved.

  In the vehicle body front part structure according to the present invention, preferably, a dashboard applique (100) is detachably connected to an upper portion of the portal reinforcing member (70).

  According to this structure, the access for the maintenance of the apparatus in the dashboard panel (20, 98) side of an internal combustion engine (110) or an engine room (22) becomes easy. Moreover, since the dashboard panel (20, 98) is disposed in front and the engine room (22) can be reduced in size, the interior space of the vehicle can be expanded accordingly.

  According to the vehicle body front structure according to the present invention, the rigidity of the suspension mechanism support portion composed of the front side frame and the damper housing and the rigidity of the vehicle body front portion are increased by the installation of the gate-shaped reinforcing member. When driving on rough roads, vibration energy input from the suspension arm to the vehicle body side is reduced, and at the same time, the front side frame is prevented from vibrating in the vertical, horizontal, and front-rear directions. Since vibrations transmitted to planar members such as glass are reduced and vibrations of these planar members can be suppressed, low and medium frequency road noise, which is an unpleasant noise generated in the passenger compartment, is reduced. In addition, since the horizontal beam portion is fixed to the dashboard panel, the support rigidity of the dashboard panel is increased, and the dashboard panel is less likely to vibrate, thereby reducing low and medium frequency road noise.

1 is a perspective view of one embodiment of a vehicle body front structure according to the present invention. The fragmentary sectional perspective view of the principal part of the vehicle body front part structure of the automobile according to the present embodiment. The fragmentary sectional perspective view of the principal part of the vehicle body front part structure of the automobile according to the present embodiment. The longitudinal cross-sectional view of the principal part of the vehicle body front part structure of the motor vehicle by this embodiment. The perspective view of the portal reinforcement member used for the vehicle body front part structure of the car by this embodiment.

  Hereinafter, an embodiment of a vehicle body front structure according to the present invention will be described with reference to FIGS.

FIG. 1 is a perspective view of a front structure of a vehicle in the present embodiment, and FIG. 2 is a sectional view thereof. The front part of the vehicle body is shown as a skeletal member on the left and right front side frames 10 extending in the vehicle longitudinal direction on both sides in the vehicle width direction of the front part of the vehicle body, and on the outside in the vehicle width direction of the front side frame 10. Left and right wheel house upper members (upper member + lower member) 12 extending forward and downward from left and right front pillars.

  The front end portions of the left and right front side frames 10 and the front end portions (lower end portions) of the left and right wheel house upper members 12 are joined to connecting plates (gussets) 15 that connect the left and right members to each other. Left and right front floor frames 16 extending in the longitudinal direction of the vehicle body are joined to the rear ends of the left and right front side frames 10. The left and right end portions of the windshield lower support panel 18 extending in the vehicle width direction are joined to the upper end portions of the left and right wheel house upper members 12. Thus, the windshield lower support panel 18 connects the upper ends of the left and right wheel house upper members 12 to each other.

  A dashboard lower panel 20 is joined to the lower side of the windshield lower support panel 18. The dashboard lower panel 20 is joined to the rear end portions of the left and right front side frames 10 at the lower portions on both the left and right sides, and separates the engine room 22 on the vehicle body front side and the vehicle room 24 on the vehicle body rear side from the engine room 22. . In other words, the rear side of the vehicle body in the engine room 22 and the front side of the vehicle body in the vehicle compartment 24 are defined by the dashboard lower panel 20. A dashboard upper panel (front cowl top member) 98 (see FIG. 4) is joined to the upper portion of the dashboard lower panel 20 together with the windshield lower support panel 18.

  Left and right damper housings 26 joined to the outer side surface of the front side frame 10, the inner side surface of the wheel house upper member 12, and the left and right side edges of the dashboard lower panel 20 are provided on the left and right sides of the engine room 22. . Further, left and right front tire house members 28 joined to the outer side surface of the front side frame 10, the inner side surface of the wheel house upper member 12, and the front edge of the damper housing 26 are respectively connected to the front side of the left and right damper housings 26. Is provided.

  A front subframe 30 is disposed at the lower part of the engine room 22. The front sub-frame 30 is a front side of two front left and right vertical members 32 extending in the longitudinal direction of the vehicle body and a front end portion of the vertical member 32 extending in the vehicle width direction. The rear lateral member 36 that connects the rear end vicinity portions of the lateral member 34 and the longitudinal member 32 to each other is formed in a substantially rectangular shape in plan view. In the present embodiment, the vertical member 32 and the rear horizontal member 36 are made of a rectangular closed cross-sectional shape material, and the front horizontal member 34 is made of a pipe material.

  The upper ends of the front mount member 38 and the rear mount member 40 having a rectangular closed cross-sectional shape are joined to the front end lower portion and the rear vicinity lower portion of the left and right front side frames 10, respectively. The front mount member 38 and the rear mount member 40 are suspended from the front side frame 10. The front ends of the vertical members 32 are joined to the lower ends of the left and right front mount members 38. The left and right ends of the rear lateral member 36 are joined to the lower ends of the left and right rear mount members 40. Further, the rear end portions of the left and right vertical members 32 are joined to a rear mount portion 16A (see FIG. 2) formed at the bottom portion near the front end of the front floor frame 16. In this way, the front sub-frame 30 is fixedly arranged in a suspended manner at the lower part of the left and right front floor frames 16 with respect to the left and right front side frames 10.

  A front arm support portion 42 is formed in the vicinity of the front end of the left and right vertical members 32, and a rear arm support portion 44 is formed in the left and right ends of the rear horizontal member 36. The left and right front arm support portions 42 respectively support a front arm portion 46A of a triport type (A type) lower arm 46 of the front suspension mechanism by a pivot 48 via a rubber bush (not shown). Each of the left and right rear arm support portions 44 supports the rear arm portion 46B of the lower arm 46 by a pivot 50 via a rubber bush (not shown).

  The intermediate arm portion 46C of the lower arm 46 supports the lower portion of the knuckle arm 52 so as to be rotatable around an axis in the vertical direction. The knuckle arm 52 includes a knuckle support portion 52A, a tie rod coupling portion 52B, and a brake caliper support portion 52C.

  The front suspension mechanism is of a straddle type, and the left and right damper housings 26 are each provided with a damper device 54 that generates a required damping force and a coil spring 56 that biases the damper device 54 in the extending direction. Has been. Each of the left and right damper devices 54 has an upper end portion connected to the upper wall portion of the damper housing 26 by a connecting portion 58 and a lower end portion movably connected to the knuckle arm 52 by a connecting portion 60.

  A portal reinforcing member 70 is disposed in front of the dashboard lower panel 20. As shown in FIG. 5, the portal reinforcing member 70 includes left and right leg portions 72 and a horizontal beam portion 74 that extends in the vehicle body width direction and connects the upper ends of the left and right leg portions 72 to each other. The upper portion of the leg 72 is curved to form an arch shape as a whole. Further, the curved portion of the left and right leg portions 72 is joined with a substantially triangular corner portion filling member 76 that connects the substantially vertical outer portion of the leg portion 72 and the substantially horizontal upper portion of the cross beam portion 74 at a right angle. Has been.

  The left and right leg portions 72 are joined to the front side frame 10 at the lower end portions in the vicinity of the support portion of the lower arm 46, that is, in the upper portion of the arrangement portion of the rear mount member 40. The left and right leg portions 72 and the corner portion compensation member 76 extend vertically along the wall surface of the damper housing 26 on the engine room 22 side, and are joined to the wall surface. Each of the leg portion 72 and the corner portion compensation member 76 has a U-shaped cross-sectional shape, and has a rectangular closed cross-sectional shape in cooperation with the wall surface of the damper housing 26. The transverse beam portion 74 is in the form of a band plate fastened and fixed to the main body 74A by a bolt 78 and a nut 80 (see FIG. 4) so as to close the upper opening of the main body 74A and a main body 74A having a U-shaped cross-sectional shape of the upper opening. The lid 74B forms a rectangular closed cross-sectional shape.

  The upper part of the leg part 72 and the outer wall of the lateral beam part 74 on the rear side of the vehicle body extend along the lower edge of these parts, and are provided with a plate-like connecting member 86 by bolts 82 and nuts 84 (see FIG. 4). Is attached.

  In the vicinity of the lower end of the left and right legs 72 on the vehicle body rear side, the lower ends of the plate-like inclined support members 88 are fixed by bolts 89. The left and right inclined support members 88 are each fixed at the upper end with a bolt 90 near the center of the connecting member 86 in the vehicle width direction. Thereby, the inclination support member 88 has connected the leg part 72 and the cross beam part 74 with the truss structure via the connection member 86, and can fully exhibit the function as a bracing.

  One end of the bracket piece 92 is joined to the central portion of the connecting member 86 in the vehicle width direction (between the left and right inclined support members 88). The other end of the bracket piece 92 is fixed to the dashboard upper panel 98 by bolts 94 and 96. Thereby, the lateral beam portion 74 is fixed to the front end portion of the dashboard upper panel 98 through the connecting member 86 and the bracket piece 92 at the center in the vehicle width direction.

  Since the portal reinforcing member 70 includes the inclined support member 88 and has a truss structure, it forms a highly rigid reinforcing member. Further, each of the leg portion 72 and the corner portion compensation member 76 has a U-shaped cross-sectional shape and forms a rectangular closed cross-sectional shape in cooperation with the wall surface of the damper housing 26, and the cross beam portion 74 has a main body 74A and a lid body 74B. Thus, the portal reinforcing member 70 forms a highly rigid reinforcing member.

The lower end portion of the leg portion 72 of the gate-shaped reinforcing member 70 having a high rigidity structure is provided at the upper portion of the arrangement portion of the rear side mount member 40 of the front side frame 10, that is, at the input portion of running vibration from the lower arm 46 to the front side frame 10. By being joined, the rigidity of the front part of the vehicle body that supports the suspension mechanism and the rigidity of the traveling vibration input part with respect to the front side frame 10 are increased. As a result, when the vehicle travels on a rough road surface, vibration energy input from the suspension arm to the vehicle body side is reduced, and at the same time, the front side frame 10 is suppressed from vibrating in the vertical, left, and right directions, and the dashboard lower panel 20. Vibrations transmitted to planar members such as floor panels and front windshield glass not shown in the figure are reduced, and vibrations of these planar members can be suppressed. Medium frequency road noise is reduced.

  Further, since the horizontal beam portion 74 is fixed to the dashboard upper panel 98 by the bracket piece 92 via the connecting member 86, the support rigidity of the dashboard upper panel 98 is also increased, and the dashboard upper panel 98 is less likely to vibrate. . This also reduces low and medium frequency road noise.

  Further, since the leg portion 72 is joined to the wall surface of the damper housing 26 to form a rectangular closed cross-sectional shape, the rigidity of the front portion of the vehicle body including the damper housing 26 can be increased, so that the support rigidity of the front suspension mechanism is improved. In addition, vibration control is suppressed, and at the same time, vehicle handling stability is improved.

  In this embodiment, the front surfaces of the connecting member 86 and the inclined support member 88 are provided on the vehicle body rear side of the cross beam portion 74 and the leg portion 72, so that the cross beam portion 74 and the leg support member 88 are provided. The position of the portion 72 in the longitudinal direction of the vehicle body is offset to the rear of the vehicle body from the front surfaces of the cross beam portion 74 and the leg portion 72.

  As a result, as shown in FIG. 3, it is possible to avoid the connection member 86 and the inclined support member 88 from interfering with the intake pipe 112 of the internal combustion engine 110 disposed in the engine room 22, and the front part of the vehicle body. Can be miniaturized.

  As shown in FIG. 4, the dashboard upper 100 is detachably fixed to the main body 74 </ b> A of the cross beam portion 74 together with the lid body 74 </ b> B by bolts 78 and nuts 80 on the upper portion of the lid body 74 </ b> B of the cross beam portion 74. Has been. The rear end portion of the dashboard upper 100 is detachably fixed to the front end portion of the dashboard upper panel 98 together with the bracket piece 92 by bolts 94 and nuts 96.

  Since the dashboard appendage 100 is removable, access for maintenance of equipment on the dashboard lower panel 20 side of the internal combustion engine 110 and the engine room 22 is facilitated. Further, since the dashboard upper panel 98 can be disposed in the front and the engine room 22 can be downsized, the interior space of the vehicle can be expanded accordingly.

  Although the present invention has been described with reference to the preferred embodiment, the present invention is not limited to such an embodiment, and can be changed as appropriate without departing from the spirit of the present invention. For example, attachment of the connecting member 86, the inclined support member 88, and the like may be performed by welding instead of bolt fastening. The rear horizontal member 36 of the front subframe 30 may be configured to connect the rear ends of the vertical members 32 to each other. In addition, all the components shown in the above embodiment are not necessarily essential, and can be appropriately selected without departing from the gist of the present invention. For example, the connecting member 86 may be omitted. In this case, the upper end portion of the inclined support member 88 is directly fixed to the horizontal beam portion 74, and the horizontal beam portion 74 is equivalent to the bracket piece 92 and is directly fixed to the dashboard upper panel 98. The front subframe 30 is not essential, and when the front subframe 30 is not provided, the lower arm 46 may be directly attached to the front side frame 10.

DESCRIPTION OF SYMBOLS 10 Front side frame 12 Wheel house upper member 16 Front floor frame 18 Wind shield lower support panel 20 Dashboard lower panel 22 Engine room 24 Car compartment 26 Damper housing 28 Front tire house member 30 Front sub-frame 32 Vertical member 34 Front side member 36 Rear lateral member 46 Lower arm 52 Knuckle arm 54 Damper device 56 Coil spring 70 Portal reinforcement member 72 Leg 74 Lateral beam portion 76 Corner portion filling member 86 Connecting member 88 Inclined support member 98 Dashboard upper panel 100 Dashboard upper 110 Internal combustion engine Engine 112 Intake pipe

When riding, especially rough road surface, the front side frames, upper and lower, left and right, are inputted vibration in the longitudinal direction, among others by the vibration of the low-medium-frequency (approximately 100 to 500 hertz) of are entered, the occupant Since noise that causes discomfort is generated in the passenger compartment, it is a challenge to improve the merchantability.

Claims (7)

Left and right front side frames extending in the longitudinal direction of the vehicle body and including a support portion of a front suspension mechanism arm; left and right damper housings joined to each of the left and right front side frames to accommodate a damper for a front suspension mechanism; A vehicle body front structure having an engine room on the front side of the vehicle body and a dashboard panel that separates a vehicle room on the rear side of the vehicle body from the engine room, joined to the left and right front side frames,
A gate comprising left and right leg portions, a horizontal beam portion extending in the vehicle body width direction and connecting the upper portions of the left and right leg portions to each other, and a left and right inclined support portion connecting the leg portions and the horizontal beam portion with a truss structure Having a shape reinforcing member,
The left and right legs are joined at their lower ends to the left and right front side frames in the vicinity of the support portion of the arm of the front suspension mechanism, and along the engine room side wall surface of the left and right damper housings. A vehicle body front structure that extends vertically and is joined to the wall surface.   2. The front side of a vehicle according to claim 1, wherein the lateral beam portion has a rectangular closed cross-sectional shape, and the leg portion has a U-shaped cross-sectional shape and has a rectangular closed cross-sectional shape in cooperation with the wall surface of the damper housing. Part structure.   The vehicle body front part structure according to claim 1 or 2, wherein the horizontal beam portion is fixed to the dashboard panel.   It further includes a connecting member that extends along the lower edge of the transverse beam portion and is fixed to the transverse beam portion, and an upper portion of the inclined support portion is fixed to the connecting member, and the inclined support portion includes the connecting member. The vehicle body front part structure according to claim 3, wherein the vehicle is fixed to the horizontal beam portion, and the horizontal beam portion is fixed to the dashboard panel via the connecting member.   Two left and right vertical members extending in the vehicle front-rear direction below the left and right front side frames and the front end portions of the vertical members and the rear end portions or the vicinity of the rear end portions extending in the vehicle width direction The sub-frame has a substantially rectangular shape in a plan view with two front and rear lateral members connected to each other, and the sub-frame supports the lower arm of the front suspension mechanism, and the leg portion of the portal-shaped reinforcing member The vehicle body front part structure according to any one of claims 1 to 4, further comprising a joint portion with the front side frame below a joint portion with the front side frame.   The vehicle body front part structure according to any one of claims 1 to 5, wherein the inclined support part is offset from the leg part of the portal reinforcing member at the rear of the vehicle body.   The vehicle body front part structure according to any one of claims 1 to 6, wherein a dashboard appendage is detachably connected to an upper portion of the portal reinforcing member.

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