JP2019006249A - Structure of vehicle body front part - Google Patents

Abstract

To suppress vibration transmission from a cross member to a steering device.SOLUTION: A steering bracket 25 is attached across an upper side of a deck cross member 21 and a surface of a cowl top floor 14 of a cowl top body 15, a reinforcement bracket 28 is attached across a lower side of the deck cross member 21 and a joint edge 15a of the cowl top body 15, and longitudinal directions of the steering bracket 25 and the reinforcement bracket 28 are made orthogonal to each other so as to be mutually inclined in opposite directions when viewed from the axial direction of the deck cross member 21 so that the rigidity in a rotation direction of the deck cross member 21 is improved.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a structure of a front portion of a vehicle body.

  Inside the instrument panel of the automobile, a deck cross member as a member member for supporting a steering device or the like extends in the vehicle width direction. Both ends of the deck cross member are joined to the front pillar. One end side of the steering bracket is attached to the driver seat side of the deck cross member, and the other end side of the steering bracket is attached to the vehicle body side (dash panel or the like). A steering device (steering column) is supported and fixed to the lower surface of the steering bracket.

  By the way, the vibration from the suspension and the engine is transmitted to the deck cross member, and the vibration transmitted to the deck cross member may be transmitted to the steering device via the steering bracket. When vibration is transmitted to the steering device, there is a possibility that the driver may feel uncomfortable. Therefore, conventionally, a technique for suppressing transmission of vibration to the steering device has been proposed (Patent Document 1).

  The technique proposed in Patent Document 1 is provided with two member members that support the steering device and are connected to each other. One is arranged in the vehicle width direction and the other is coupled to a floor panel or the like. To ensure rigidity. For this reason, the two member members are firmly fixed, the rigidity of the portion where the steering device is supported is improved, and the transmission of vibration to the steering device can be suppressed.

  However, the technique disclosed in the cited document 1 includes a brace for connecting and fixing the second member member on the driver's seat side and the two member members to the floor side in addition to the member member extending in the vehicle width direction. And the brace for fixing the member member over a vehicle width direction to the dash panel side, and the brace for connecting two member members and fixing to the dash panel side are required. For this reason, there is a problem that the number of parts increases and the weight increases.

  Moreover, since there is no idea of suppressing the rotation of the member member itself, it has been impossible to suppress the transmission of vibrations to the steering device accompanying the rotation of the member member itself. In order to suppress the transmission of vibration to the steering device accompanying the rotation of the member member itself, it is necessary to increase the strength by increasing the size of the brace that connects the two member members. Will lead to.

JP 2012-46002 A

  The present invention has been made in view of the above situation, and it is possible to improve the rigidity of a cross member member that supports a steering device with a minimum reinforcing member, and to suppress transmission of vibration to the steering device. The purpose is to provide a structure.

  In order to achieve the above object, the structure of the front part of the vehicle body of the present invention according to claim 1 includes a cowl top member that extends in the width direction of the vehicle and supports the lower edge of the windshield, and a rear side of the cowl top member. In the structure of the front portion of the vehicle body, comprising: a cross member member arranged extending in the width direction of the vehicle and having both ends coupled to the front pillar; and a steering device supported by the cross member member. A steering bracket that extends toward the front of the vehicle from a position at which the steering device is supported and is connected to the cowl top member, and a position different in the axial direction from the position of the steering bracket of the cross member member toward the front of the vehicle. And a steering bracket that includes a reinforcing bracket connected to the cowl top member. Tsu bets, and said reinforcing bracket, when viewed from the axial direction of the cross member element, wherein the longitudinal direction is arranged to intersect to be inclined in opposite directions to each other in the vertical direction.

  In the present invention according to claim 1, the steering bracket attached to the cross member member and the reinforcing bracket attached at different positions in the axial direction are viewed from the axial direction of the cross member member (viewed from the lateral direction of the vehicle). Since the steering bracket and the reinforcing bracket are arranged so that the longitudinal directions of the steering bracket and the reinforcing bracket are inclined in opposite directions in the vertical direction, the steering bracket and the reinforcing bracket not only suppress the displacement of the cross member member in the vertical direction. The rotation around the axis is suppressed.

  For this reason, the rigidity of the cross member member, in particular, the rigidity in the rotational direction around the axis, that is, the torsional rigidity is improved, and the minimum reinforcing member is arranged over the width direction of the vehicle without increasing the weight. It is possible to improve the rigidity of the cross member member and suppress the transmission of vibration from the cross member member to the steering device.

  Incidentally, JP-A-2015-101136 discloses a steering bracket connected to a dash panel side on a steering member extending in the vehicle width direction in order to suppress movement of the steering device in the left-right direction of the vehicle at the time of a frontal collision of the vehicle. A vehicle front body structure including a steering bracket and a cowl bracket that connects a dash panel at different positions in the axial direction is disclosed.

  Japanese Patent Laid-Open No. 2015-101136 discloses a cowl bracket corresponding to the reinforcing bracket of the present invention. However, a steering bracket (a cowl bracket on the steering bracket side) and a vehicle with a cowl bracket at a position different in the axial direction are disclosed. There is no disclosure about the arrangement relationship in the vertical direction.

  That is, the cowl bracket is arranged to support the steering member in the left-right direction for the purpose of suppressing the movement of the steering device in the left-right direction. The arrangement position in the direction is preferably the same position, and if the position is shifted, the force for supporting the steering member in the left-right direction is dispersed, and the purpose of suppressing the movement of the steering device in the left-right direction cannot be achieved. .

  For this reason, even if the cowl bracket corresponding to the reinforcing bracket is disclosed, the technology disclosed in Japanese Patent Application Laid-Open No. 2015-101136 is a technology that denies the configuration of the present invention, Can not be.

  According to a second aspect of the present invention, the structure of the front portion of the vehicle body of the present invention is the structure of the front portion of the vehicle body according to the first aspect, wherein one of the steering bracket or the reinforcing bracket has a rear end portion that is the cross member. It is attached to the upper half part of the member, and the front end part is attached to the cowl top member at a position below the rear end part. The other of the steering bracket or the reinforcing bracket has the rear end part of the cross member member. And the front end portion is attached to the cowl top member at a position higher than the rear end portion, and the longitudinal direction of the steering bracket and the reinforcing bracket is vertically changed so as to intersect each other. It is characterized by being inclined.

  In the present invention according to claim 2, since the steering bracket and the reinforcing bracket are disposed so as to be inclined in the vertical direction so as to cross each other, the steering bracket and the reinforcing bracket are more inclined with respect to the cross member member. It is possible to suppress the displacement of the cross member member in the vertical direction more reliably. Therefore, transmission of vibration from the cross member member to the steering device can be more efficiently suppressed.

  According to a third aspect of the present invention, the front body structure of the present invention is the front body structure of the second aspect, wherein the cowl top member extends in the vehicle width direction at the lower edge of the windshield of the vehicle. A cowl top upper and a cowl top lower joined to a rear end edge of the cowl top upper. The steering bracket and the other front end of the reinforcing bracket are connected to the cowl top upper. It is characterized by being connected to the joint edge with the cowl top lower.

  In the present invention according to claim 3, the joint edge between the cowl top upper and the cowl top lower of the cowl top member is a portion where the flanges are joined to each other and the rigidity is relatively high. The other end of the reinforcing bracket can be connected to a highly rigid portion, and the mounting bracket can be secured without increasing the size of the steering bracket or the reinforcing bracket (without increasing the width of the cross member member in the axial direction). be able to.

  According to a fourth aspect of the present invention, there is provided a vehicle body front portion structure according to the third aspect, wherein the cowl top member has a closed cross section by the cowl top upper and the cowl top lower. It is formed.

  According to the fourth aspect of the present invention, the cowl top member, which is supported by the steering bracket and the reinforcing bracket being joined, has a closed cross section formed by the cowl top upper and the cowl top lower, so that the rigidity of the cowl top member is improved, and the steering bracket is improved. In addition, the mounting rigidity can be ensured without increasing the size of the reinforcing bracket (without increasing the width of the cross member member in the axial direction).

  The structure of the front part of the vehicle body according to the present invention can improve the rigidity of the cross member member that supports the steering device with the minimum reinforcing member, and can suppress the transmission of vibration from the cross member member to the steering device.

It is an external view explaining the structure of the vehicle body front part concerning 1st Example of this invention. It is an external view of the principal part in FIG. FIG. 3 is a plan view in FIG. 2. It is the IV-IV sectional view taken on the line in FIG. It is the VV sectional view taken on the line in FIG. It is an external view of the principal part explaining the structure of the vehicle body front part concerning 2nd Example of this invention.

  FIG. 1 shows a state of a vehicle body front portion according to a first embodiment of the present invention as viewed from the vehicle interior side, and FIG. 2 shows a member member at a portion to which a steering bracket and a reinforcing bracket are attached. FIG. 3 is a plan view in FIG. 2, FIG. 4 is a cross-sectional view of the part to which the steering bracket is attached (cross-sectional view from the IV-IV line direction in FIG. 2), FIG. 5 shows a situation of a cross-sectional view (a cross-sectional view from the direction of the VV line in FIG. 2) of the portion where the reinforcing bracket is attached.

  Mainly, as shown in FIG. 1, a pair of left and right side members 1 extending in the front-rear direction of the vehicle body is disposed on both sides in the width direction of the lower portion of the vehicle body. The pair of left and right front pillars 2 are joined to the base end portion of the upper frame 3. The upper frame 3 extends forward of the vehicle body and is disposed in a pair on both sides in the width direction outside the side member 1.

  The parts where the base end portions of the upper frame 3 of the front pillar 2 are joined to each other are connected by a cowl top member 5 that supports the lower edge of the windshield. That is, the cowl top member 5 is arranged extending in the vehicle width direction at the lower edge of the windshield, and both ends thereof are joined to the front pillar 2 corresponding to the base end portion of the upper frame 3.

  Below the cowl top member 5, a dash panel 6 that divides the vehicle compartment and a region in front of the vehicle compartment (for example, an engine room) is disposed. A member 7 is provided. Both ends of the dash cross member 7 are joined to the lower part of the front pillar 2.

  The lower part of the dash panel 6 (lower part of the dash cross member 7) is connected to the floor 8 of the passenger compartment. A backbone 9 formed in a tunnel shape protruding upward and extending in the vehicle front-rear direction is provided at the center in the width direction of the floor 8.

  As shown mainly in FIGS. 1, 2, 4, and 5, the cowl top member 5 includes a cowl top main body 15 including a cowl top upper 13 that extends in the vehicle width direction and a cowl top lower 14. Yes. The cowl top body 15 has a concave shape in which the cowl top lower 14 is opened upward, and a cowl top upper 13 having a U-shaped cross section is formed on the front surface of the rear wall of the cowl top lower 14. Are assembled so as to form a closed cross section. The rear end edge of the cowl top upper 13 and the upper edge of the cowl top lower 14 of the cowl top body 15 are joined edges 15a where flange surfaces extending in the vehicle width direction are joined.

  The cowl top member 5 is a cross-sectional hat type that extends along the vehicle width direction on the lower surface of the cowl top lower 14 of the cowl top main body 15 and forms a closed cross-sectional shape with the lower surface of the cowl top lower 14. The cowl top plate 16 is provided.

  As shown in FIG. 1, a deck cross member 21 as a cross member member extending in the vehicle width direction along the cowl top member 5 is provided on the cabin side of the cowl top member 5. The deck cross member 21 is formed in a pipe shape, and both ends are joined to the front pillar 2. A brace bar 22 is stretched over the central portion of the deck cross member 21 and the backbone 9.

  1, 2, and 3, the driver's side of the deck cross member 21 has a large diameter, and the driver operates the steering wheel 25 in the thickened portion. A steering device 27 (steering column) having a steering wheel 26 is supported. The steering bracket 25 is attached across the deck cross member 21 and the cowl top member 5.

  Adjacent to the passenger seat side of the portion where the brace bar 22 is attached, a reinforcing bracket 28 is disposed on the deck cross member 21, and the reinforcing bracket 28 is attached across the deck cross member 21 and the cowl top member 5. Yes. The reinforcing bracket 28 is provided at a position different from the steering bracket 25 in the axial direction of the deck cross member 21.

  As shown mainly in FIGS. 4 and 5, the steering bracket 25 and the reinforcing bracket 28 are configured so that the longitudinal directions of the steering bracket 25 and the reinforcing bracket 28 are opposite to each other when viewed from the axial direction of the deck cross member 21. It is arranged toward the front so as to incline.

  More specifically, the steering bracket 25 extends linearly downward from the upper side (upper half portion) of the deck cross member 21 toward the front side (the cowl top body 15), and the reinforcing bracket 28 extends below the deck cross member 21. A straight line extends obliquely upward from the side (lower half) toward the front (the cowl top main body 15). In this way, the steering bracket 25 and the reinforcing bracket 28 are disposed so as to be inclined in opposite directions so that the longitudinal directions of the steering bracket 25 and the reinforcing bracket 28 intersect each other when viewed from the axial direction of the deck cross member 21.

  As described above, the deck cross member 21 is supported in the vertical direction by the steering bracket 25 and the reinforcing bracket 28, so that the vertical displacement of the deck cross member 21 is suppressed.

  Further, the steering bracket 25 and the reinforcing bracket 28 are stretched against the twisting of the deck cross member 21, and the deck cross member 21 rotates to one side in the direction around the axis (counterclockwise rotation in FIG. 4). Is suppressed by the steering bracket 25, and the rotation of the deck cross member 21 in the direction around the axis (rotation in the clockwise direction in FIG. 5) is suppressed by the reinforcing bracket 28.

  The mounting state of the steering bracket 25 and the reinforcing bracket 28 will be specifically described.

  As shown in FIGS. 1 to 5, the steering bracket 25 is attached so that the rear end portion (end portion on the vehicle compartment side) in the vehicle front-rear direction surrounds the upper half on the upper side of the deck cross member 21. (End portion on the engine room side) is joined to the surface of the cowl top lower 14 of the cowl top body 15 of the cowl top member 5 via the connection plate 31 at a position below the rear end portion.

  The steering bracket 25 is linearly extended from the upper side of the deck cross member 21 toward the vehicle front obliquely downward and is joined to the cowl top lower 14 below the deck cross member 21.

  That is, the rear end portion of the steering bracket 25 is inclined toward the opposite side in the vertical direction to the side that is attached to the deck cross member 21. Thereby, since the inclination angle of the steering bracket 25 can be increased, the support rigidity against the upward displacement of the deck cross member 21 is improved.

  In addition, the cowl top main body 15 to which the steering bracket 25 is joined is a part having a closed cross section formed by the cowl top upper 13 and the cowl top lower 14. In the case where a working hole or the like is formed in the cowl top main body 15 to which the steering bracket 25 is joined, the hole can be closed with a plate or the like to form a closed cross section.

  A support plate 32 is provided on the steering bracket 25, and the support plate 32 is disposed below the deck cross member 21. By fixing the steering device 27 to the support plate 32, the steering device 27 is attached to the lower side of the steering bracket 25.

  Since the steering bracket 25 is attached to the upper side of the deck cross member 21, it is possible to eliminate the restriction on the installation of the dropping mechanism of the steering device 27 at the time of the collision on the lower side of the deck cross member 21.

  The reinforcing bracket 28 is attached so that the rear end portion (vehicle compartment side portion) in the vehicle front-rear direction surrounds the lower half portion in the radial direction below the deck cross member 21, and the front end portion (on the engine room side). Part) is coupled to the upper surface side of the joining edge 15a of the cowl top body 15 of the cowl top member 5 at a position above the rear end.

  The reinforcing bracket 28 extends linearly from the lower side of the deck cross member 21 toward the upper front of the vehicle and is joined to the joining edge 15a of the cowl top body 15 above the deck cross member 21. Become.

  That is, the rear end portion of the reinforcing bracket 28 is inclined toward the opposite side in the vertical direction with respect to the side attached to the deck cross member 21. Thereby, since the inclination angle of the reinforcement bracket 28 can be taken large, the support rigidity with respect to the downward displacement of the deck cross member 21 is improved.

  Note that the joining edge 15a to which the reinforcing bracket 28 is joined is joined in a state where the flanges of the cowl top upper 13 and the cowl top lower 14 are overlapped with each other, so that the joining edge 15a is a portion having relatively high rigidity.

  As described above, in the structure of the vehicle body front portion configured as described above, the longitudinal directions of the steering bracket 25 and the reinforcing bracket 28 are inclined in opposite directions in the vertical direction when viewed from the axial direction of the deck cross member 21. Therefore, the steering bracket 25 and the reinforcing bracket 28 suppress the displacement of the deck cross member 21 in the vertical direction.

  Further, the rotation of the deck cross member 21 to one side in the direction around the axis (counterclockwise rotation in FIG. 4) is suppressed by the steering bracket 25, and the rotation of the deck cross member 21 to the other side in the direction around the axis ( The rotation in the clockwise direction in FIG.

  That is, the steering bracket 25 and the reinforcing bracket 28 function as a tension member, and the support rigidity of the deck cross member 21 in the vertical direction and the direction around the axis is improved. Therefore, the rigidity of the deck cross member 21 can be improved with the minimum reinforcing member without increasing the size of the reinforcing member.

  As a result, an increase in weight and cost can be suppressed and transmission of vibration from the deck cross member 21 to the steering device 27 (steering wheel 26) can be suppressed, and vibration from the steering wheel 26 felt by the occupant can be greatly reduced. It becomes possible.

  Further, the steering bracket 25 extends linearly from the upper side (upper half) of the deck cross member 21 toward the vehicle front obliquely downward, and is coupled to the cowl top main body 15 at a position below the deck cross member 21 for reinforcement. The bracket 28 extends linearly from the lower side (lower half) of the deck cross member 21 obliquely upward to the front of the vehicle, and is coupled to the cowl top main body 15 at a position above the deck cross member 21, so that the steering bracket 25 and the reinforcing bracket 28 are arranged so as to cross each other (see FIGS. 4 and 5).

  For this reason, the steering bracket 25 and the reinforcing bracket 28 can be more inclined and can be supported from the vertical direction with respect to the deck cross member 21. Thereby, the vibration of the deck cross member 21 can be suppressed more efficiently.

  Further, since the joint edge 15a of the cowl top body 15 is a portion where the flanges are joined and the rigidity is increased, the reinforcing bracket 28 can be coupled to the highly rigid portion. Without increasing the size (without increasing the width of the deck cross member 21 in the axial direction), the mounting rigidity can be ensured while maintaining the weight reduction.

  Further, the steering bracket 25 and the reinforcing bracket 28 of the cowl top main body 15 have a closed cross section formed by the cowl top upper 13 at the portion of the cowl top lower 14 to which the steering bracket 25 and the reinforcing bracket 28 are attached. The mounting rigidity can be improved.

  As described above, since the mounting rigidity of the front end portions of the steering bracket 25 and the reinforcing bracket 28 is improved, the vibration of the deck cross member 21 can be more reliably suppressed.

  A second embodiment of the present invention will be described with reference to FIG. FIG. 6 shows the appearance of the steering member for explaining the structure of the front portion of the vehicle body according to the second embodiment and the member member part where the reinforcing bracket is attached. The same components as those in the first embodiment shown in FIGS. 1 to 5 are denoted by the same reference numerals.

  In the second embodiment shown in FIG. 6, the rear end portion (vehicle compartment side portion) of the steering bracket 25 in the vehicle front-rear direction is attached to the lower side (lower half portion) of the deck cross member 21. This is an example in which the rear end portion (portion on the vehicle compartment side) in the vehicle longitudinal direction is attached to the upper side (upper half portion) of the deck cross member 21.

  In the vehicle front structure described above, the steering bracket 25 is attached over the upper side of the deck cross member 21 and the surface of the cowl top lower 14 of the cowl top body 15, and the reinforcing bracket 28 is attached to the deck cross member 21. Since it is attached over the lower side and the joining edge 15a of the cowl top main body 15, the longitudinal direction of the steering bracket 25 and the reinforcing bracket 28 when viewed from the axial direction of the deck cross member 21 is The deck cross member 21 can be disposed so as to extend obliquely in opposite directions, and the support rigidity of the deck cross member 21 in the vertical direction and the direction around the axis is improved. As a result, transmission of vibration from the deck cross member 21 to the steering device 27 (steering wheel 26) can be suppressed.

  The present invention can be used in the industrial field of the structure of the front portion of the vehicle body.

DESCRIPTION OF SYMBOLS 1 Side member 2 Front pillar 3 Upper frame 5 Cowl top member 6 Dash panel 7 Dash cross member 8 Floor 9 Backbone 13 Cowl top upper 14 Cowl top lower 15 Cowl top main body 16 Cowl top plate 21 Deck cross member 22 Brace bar 25 Steering bracket 26 Steering wheel 27 Steering device 28 Reinforcement bracket 31 Connection plate

Claims (4)

A cowl top member extending in the width direction of the vehicle and supporting the lower edge of the windshield;
A cross member member arranged extending in the width direction of the vehicle on the rear side of the cowl top member and having both ends coupled to the front pillar,
In the structure of the front part of the vehicle body provided with a steering device supported by the cross member member,
A steering bracket extending from the position of the cross member member where the steering device is supported toward the front of the vehicle and coupled to the cowl top member;
A reinforcing bracket extending from the position different from the position of the steering bracket of the cross member member in the axial direction toward the front of the vehicle and connected to the cowl top member;
The vehicle body front portion, wherein the steering bracket and the reinforcing bracket are arranged so as to intersect with each other so that the longitudinal direction is inclined in opposite directions when viewed in the axial direction of the cross member member Structure. In the structure of the front part of the vehicle body according to claim 1,
One of the steering bracket or the reinforcing bracket has a rear end attached to the upper half of the cross member member and a front end attached to the cowl top member at a position below the rear end. The other of the steering bracket or the reinforcing bracket has a rear end attached to the lower half of the cross member member and a front end attached to the cowl top member at a position above the rear end. The structure of the front portion of the vehicle body, wherein the steering bracket and the reinforcing bracket are disposed so as to be inclined in the vertical direction so that the longitudinal directions thereof intersect each other. In the structure of the front part of the vehicle body according to claim 2,
The cowl top member includes a cowl top upper arranged to extend in the vehicle width direction at the lower edge of the windshield of the vehicle, and a cowl top lower joined to the rear edge of the cowl top upper.
The structure of the front portion of the vehicle body, wherein the other front end portion of the steering bracket and the reinforcing bracket is coupled to a joint edge between the cowl top upper and the cowl top lower. In the structure of the vehicle body front part according to claim 3,
The cowl top member has a closed cross section formed by the cowl top upper and the cowl top lower.

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