JP6611773B2 - Subframe for vehicle - Google Patents

Description

  The present invention relates to a vehicle subframe, and more particularly to a vehicle subframe that supports a suspension arm or the like and is attached to a vehicle such as an automobile.

  In recent years, there is a growing need for weight reduction in subframes mounted on vehicles such as automobiles due to stricter fuel efficiency regulations. These dissimilar materials are also joined to each other.

  For this reason, such subframes are required to be mounted on the vehicle body in a manner in which their strength and rigidity are further increased.

  Under such circumstances, Patent Document 1 relates to a suspension member, in order to increase the rigidity with respect to an input at the time of steering or collision, from the front lower arm connecting point that is the connecting point of the lower arm on the front side, A configuration is disclosed that includes a closed cross-section structure portion that extends linearly toward a rear body attachment point that is a point and is located on the opposite side of the front lower arm coupling point in the vehicle width direction.

Japanese Patent Application Laid-Open No. 2006-159727

  However, according to the study of the present inventor, the configuration of Patent Document 1 is effective in terms of transmitting the input load from the suspension arm to the vehicle body side, but in order to configure the closed cross-section structure portion, There is a possibility that the manufacturing process involving press molding or welding becomes complicated and the cost may increase, and there is room for improvement.

  The present invention has been made in view of the above, and an object of the present invention is to provide a vehicle subframe that can efficiently transmit an input load from a suspension arm to the vehicle body without increasing costs. .

In order to achieve the above object, in the first aspect, the present invention provides an upper member and a lower member that faces the upper member from below and is joined to the upper member by a plurality of joints. The upper member and the lower member cooperate to form a main body portion having a hollow cross section, and the main body portion is disposed on one side and the front side in the width direction of the vehicle. A right suspension arm support portion disposed on the other side and the front side in the width direction, a left vehicle body support portion disposed on the one side and the rear side in the width direction, and the other side in the width direction. And a right vehicle body side support portion disposed on the rear side, and an external force application component support portion provided at the center in the width direction of the main body portion and supported by an external force application component, and the plurality of joints And the left suspension arm support part It includes a first straight line connecting the serial right vehicle body side support portion, and the right suspension arm support portion and the second straight line connecting the said left vehicle body side support portion, the intersection or the central joint located in the vicinity of the intersection of The center joint portion is a vehicle subframe located in a region between the intersection and the external force application component support portion .

In addition to the first aspect, the present invention provides the external force application component support, wherein the plurality of joint portions include a front joint portion disposed in front of the central joint portion and paired in the width direction. The part is arranged in a region surrounded by the central joint and the front joint as a second aspect.

The vehicle subframe according to the first aspect of the present invention includes an upper member, and a lower member that faces the upper member from below and is joined to the upper member by a plurality of joints. The upper member and the lower member cooperate to form a main body portion having a hollow cross section, and the main body portion includes a left suspension arm support portion disposed on one side and the front side in the width direction of the vehicle, A right suspension arm support portion disposed on the other side in the width direction and the front side; a left vehicle body support portion disposed on the one side in the width direction and the rear side; and the other side in the width direction and the rear side. A right vehicle body side support portion disposed on the side, and an external force application component support portion provided in the center of the body portion in the width direction and supported by an external force application component , wherein the plurality of joint portions are The left suspension arm support part; It includes a first straight line connecting the serial right vehicle body side support portion, and the right suspension arm support portion and the second straight line connecting the said left vehicle body side support portion, the intersection or the central joint located in the vicinity of the intersection of The central joint portion is located in a region between the intersection and the external force application component support portion, so that the lower member of the lower member due to the input load from the left and right suspension arm support portions disposed in the vehicle width direction is provided. Since the twist and distortion can be suppressed, the input load from the suspension arm can be efficiently transmitted to the vehicle body without increasing costs, and the support strength and rigidity of external force application parts such as jacks are improved. can do.

Further, it is possible to transmit the input load from the left and right suspension arms supporting portion without providing a junction over Retained efficiently vehicle body.

Further, it is possible to suppress the buckling of the outer force application component support.

Further, according to the vehicle subframe according to the second aspect of the present invention, the plurality of joints include the front joints disposed in front of the center joint and paired in the width direction. Since the application component support part is disposed in a region surrounded by the central joint part and the front joint part, the strength and rigidity around the external force application part support part are enhanced. Can be further suppressed, and the strength and rigidity of the main body can be enhanced.

It is a bottom view of the subframe for vehicles in the embodiment of the present invention. It is a top view of the subframe for vehicles in the embodiment of the present invention. It is AA sectional drawing of FIG.

  Hereinafter, a vehicle subframe according to an embodiment of the present invention will be described in detail with reference to the drawings as appropriate. In the figure, the x-axis, y-axis, and z-axis form a three-axis orthogonal coordinate system. The positive direction of the y-axis is the forward direction, the negative direction of the y-axis is the backward direction, the x-axis direction is the left-right direction, and the z-axis is A description will be given assuming that the positive direction is upward and the negative direction of the z-axis is downward.

  FIG. 1 is a bottom view of a vehicle subframe according to an embodiment of the present invention. FIG. 2 is a plan view of the vehicle subframe in the embodiment of the present invention. FIG. 3 is a cross-sectional view taken along the line AA of FIG.

  As shown in FIG. 1 to FIG. 3, the vehicle subframe 1 typically joins an upper member 20 made of a die-cast member such as aluminum and a lower member 10 obtained by pressing a flat plate member such as a steel plate. Although not shown in the drawings, the suspension arm is supported while being mounted on a vehicle body such as a front side frame defining a front engine bay of a vehicle such as an automobile. Such a vehicle subframe 1 is typically a plane parallel to the yz plane and symmetrical with respect to a plane passing through a center line running in the longitudinal direction in the center in the width direction (left-right direction) of the vehicle body. Have a different shape.

  Specifically, the vehicle subframe 1 includes a main body 2 that typically has a box-shaped closed cross-sectional structure, and the main body 2 is joined to and integrated with each other, and an upper member 20 and an upper member. The lower member 10 is opposed to the upper member 20 from below, and is joined to the upper member 20 by a plurality of joints including a front joint 106, a front joint 107, a central joint 108, and a joint 111. The upper member 20 and the lower member 10 cooperate to constitute the main body 2 having a hollow cross section. Here, friction stir welding refers to joining two members using frictional heat.

  A first hole 109 and a second hole 110 are formed in the lower member 10. The upper member 20 is a die-cast member that basically has a convex shape upward. The upper member 20 is formed with a third hole 209 that faces the first hole and a fourth hole 210 that faces the second hole 110. Further, the upper member 20 is formed with a thick wall portion 202 which is opposed to the front side joining portion 106 and has a lower end opened to the outside, and a mech hole 203 having a thread groove formed in an inner peripheral portion thereof. Yes.

  Further, in the vehicle subframe 1, a first straight line L1 connecting the left suspension arm support portion S1 and the right vehicle body side support portion 105, and a first straight line connecting the right suspension arm support portion S2 and the left vehicle body side support portion 104. The straight line L2 intersects at the intersection point P. The intersection point P is a plane parallel to the yz plane and exists on a center line that runs in the longitudinal direction in the center in the width direction of the vehicle body.

  The main body 2 includes a left front vehicle body side attachment portion M1, a right front vehicle body side attachment portion M2, a left rear vehicle body side attachment portion M3, a right rear vehicle body side attachment portion M4, a left suspension arm support portion S1, The suspension arm support portion S2, the left suspension arm support portion S3, the right suspension arm support portion S4, the external force application component support portion 101, the left vehicle body side support portion 104, and the right vehicle body side support portion 105 in the width direction. It has a front joint 106 and a front joint 107 that form a pair, a central joint 108, and a joint 111.

  In the left front vehicle body side mounting portion M1, a fastening member such as a bolt (not shown) is fastened to a left front side frame (not shown) on the vehicle body side via a mounting hole 131 of the left connecting member 130. It is attached to. The right front vehicle body side mounting portion M2 is configured such that a fastening member such as a bolt (not shown) is fastened to a right front side frame (not shown) on the vehicle body side via a mounting hole 121 of the right connecting member 120. It is attached to. The left rear body side mounting portion M3 is fastened to the right front side frame via a collar member (not shown) and a fastening member such as a fastening bolt (not shown) via the through hole of the left body side support 104. And mounted on the vehicle body. The right rear vehicle body side mounting portion M4 is fastened to the left front side frame via a collar member (not shown) and a fastening member such as a fastening bolt (not shown) via the through hole of the right vehicle body side support portion 105. And mounted on the vehicle body.

  The left suspension arm support portion S1 protrudes upward from the left side and the front side in the width direction of the upper member 20, and is disposed on the left front vehicle body side attachment portion M1 fastened by a plurality of fastening portions. Specifically, the left suspension arm support portion S1 is formed so as to penetrate in the front-rear direction of the vehicle body, and has a front through-hole 301 and a rear through-hole 302 that are disposed to face each other in the front-rear direction. Yes. Note that it is desirable that a nut member be fixed to one of the front through hole 301 and the rear through hole 302.

  A left front pivot in a suspension arm (not shown) is fastened and attached to the left suspension arm support S1 by a fastening member such as a fastening bolt (not shown) through a through hole 102. The left front pivot is a suspension pivot that is positioned opposite to the right side of the left front wheel side suspension pivot (not shown), defines the position of the left front wheel in the vehicle width direction, and is mainly in the vehicle width direction with respect to the main body 2. A relatively large external force is applied to. A typical configuration of such a left front pivot has a configuration in which a rubber portion is bonded to a collar member through which the fastening member is inserted, and an insulator bush member having a small spring constant in the longitudinal direction and a large spring constant in the vehicle width direction. Is mentioned.

  The right suspension arm support portion S2 protrudes upward from the right side and the front side in the width direction of the upper member 20, and is disposed on the right front vehicle body side attachment portion M2 fastened by a plurality of fastening portions. Specifically, the right suspension arm support portion S2 is formed so as to penetrate in the front-rear direction of the vehicle body, and has a front side through-hole 303 and a rear side through-hole 304 disposed to face each other in the front-rear direction. Yes. Note that it is desirable that a nut member be fixed to one of the front through hole 303 and the rear through hole 304.

  A right front pivot in the suspension arm is fastened to and attached to the right suspension arm support S2 by a fastening member such as a fastening bolt (not shown) through the through hole 103. The right front pivot is a suspension pivot that faces the left side of the right front wheel suspension suspension (not shown), defines the position of the right front wheel in the vehicle width direction, and is mainly in the vehicle width direction with respect to the main body 2. A relatively large external force is applied to. A typical configuration of such a right front pivot has a configuration in which a rubber portion is bonded to a collar member through which the fastening member is inserted, and an insulator bush member having a small spring constant in the longitudinal direction and a large spring constant in the vehicle width direction. Is mentioned.

  The left suspension arm support portion S3 is disposed in the left front vehicle body side attachment portion M3. A left rear suspension pivot of the left suspension arm is attached to the left suspension arm support S3 via a bracket (not shown).

  The right suspension arm support portion S4 is disposed on the right rear vehicle body side attachment portion M4. The right rear suspension pivot of the right suspension arm is attached to the right suspension arm support S4 via a bracket (not shown).

  The external force application component support portion 101 is provided at the center in the left-right direction that is the width direction of the vehicle of the main body portion 2 and is typically supported by an external force application component (not shown) such as a jack. The external force application component support portion 101 is disposed in a region surrounded by the central joint portion 108, the front side joint portion 106, and the front side joint portion 107.

  The left vehicle body side support portion 104 includes a through hole penetrating the lower member 10 and the upper member 20 in the vertical direction, and is disposed on the left side and the rear side in the width direction.

  The right vehicle body side support portion 105 includes a through-hole penetrating the lower member 10 and the upper member 20 in the vertical direction, and is disposed on the right side and the rear side in the width direction.

  The front joint portion 106 is disposed in front of the central joint portion 108 and has a through hole, and the upper member 20 and the lower member are formed by bolts 30 that pass through the through hole and are inserted into the mezzle hole 203. 10 is bolted. The front joint 107 has the same configuration as the front joint 106.

  The central joint 108 is provided in the vicinity of the intersection P between the first straight line L2 and the second straight line L1, and joins the upper member 20 and the lower member 10 by friction stir welding.

  For the input load from the left suspension arm support S1, the load is transmitted mainly from the left suspension arm support S1 toward the right rear vehicle body side mounting part M4, so the upper member 20 and the lower member 10 are joined. It is preferable that the central joint portion 108 to be positioned is located on the second straight line L1 from the viewpoint of suppressing twisting and distortion of the lower member 10. Furthermore, the center joint 108 is more preferably set at the intersection P or in the vicinity of the intersection P from the viewpoint of efficiently transmitting an input load from the right suspension arm support S2, which will be described later in detail.

  Further, with respect to the input load from the right suspension arm support portion S2, the load is transmitted mainly from the right suspension arm support portion S2 toward the left rear vehicle body side attachment portion M3. From the viewpoint of suppressing twisting and distortion of the lower member 10, it is preferable that the central joint portion 108 that joins is positioned on the first straight line L <b> 2. Furthermore, it is more preferable that the center joint portion 108 is set at the intersection point P or in the vicinity of the intersection point P from the viewpoint of efficiently transmitting the input load from the left suspension arm support portion S1.

  When the center joint portion 108 is provided in the vicinity of the intersection point P, it is preferable that the center joint portion 108 is located at the center in the width direction in the region between the intersection point P and the external force application component support portion 101. The central joint 108 is not limited to being located on both the first straight line L2 and the second straight line L1, but may be located on at least one of the first straight line L2 and the second straight line L1. That's fine.

  Next, the configuration of the first hole 109 and the second hole 110 provided in the main body 2 will be described in detail. The first hole 109 and the second hole 110 are typically a plane parallel to the yz plane and a plane passing through a center line running in the longitudinal direction in the center in the width direction of the vehicle body. It has a symmetrical shape.

  Here, in the bottom view, the main body portion 2 includes a first region R1 that extends from the intersection point P1 of the first straight line L2 and the second straight line L1 toward the left side, and a second region R2 that extends from the intersection point P1 toward the right side. When the third region R3 extending from the intersection P1 toward the front side is defined, the portion where the first hole 109 is provided is the first region R1, and the portion where the second hole 110 is provided is the second region R2. It is.

  As described above, the reason why the first hole 109 is provided in the first region R1 is that the first hole 109 does not become complicated in press molding while ensuring the strength and rigidity of the main body 2 sufficiently and sufficiently. This is because it can be formed as a single hole and a relatively large hole for reducing the weight of the main body 2. For example, if the first hole 109 is provided in the third region R3, the external force application component support portion 101 needs to be present, so the first hole 109 divides the external force application component support portion 101. It is because it is necessary to take the aspect of the hole part divided | segmented so that it may not.

  In addition, the reason why the second hole 110 is provided in the second region R2 is to ensure that the second hole 110 does not become complicated in press forming while ensuring the strength and rigidity of the main body 2 sufficiently and sufficiently. This is because it can be formed as a single hole and is considered to be obtained as a relatively large hole for reducing the weight of the main body 2. For example, if the second hole 110 is provided in the third region R3, the external force application component support portion 101 needs to be present, so the second hole 110 divides the external force application component support portion 101. It is because it is necessary to take the aspect of the hole part divided | segmented so that it may not.

  Next, the configuration of the third hole 209 and the fourth hole 210 provided in the main body 2 will be described in detail. The third hole portion 209 and the fourth hole portion 210 are typically parallel to the yz plane, and with respect to a plane passing through a center line running in the longitudinal direction in the center in the width direction of the vehicle body. It has a symmetrical shape.

  Here, in plan view, the main body 2 has a fourth region R4 that faces the first region R1, a fifth region R5 that faces the second region R2, and a third region R3 that faces the third region R3. When the six regions R6 and the seventh region R7 that expands from the point facing the intersection point P1 to the rear side are defined, the portion where the third hole 209 is provided is the fourth region R4, and the fourth hole 210 The region where is provided is the fifth region R5.

  Thus, the reason why the third hole portion 209 is provided in the fourth region R4 is that the third hole portion 209 is a molten metal at the time of manufacturing the upper member 20 while ensuring the strength and rigidity of the main body portion 2 sufficiently and sufficiently. This is because it can be formed as a single hole so that the hot water flow is not complicated, and it can be obtained as a relatively large hole for reducing the weight of the main body 2. For example, assuming that the third hole 209 is provided in the sixth region R6, it is necessary to provide a wall thickness for fastening with the bolt 30 that is bolted to the front joint 106 and the front joint 107, This is because the third hole portion 209 needs to take the form of a hole portion that is divided so as not to divide the front side joint portion 106 and the front side joint portion 107. Further, if the third hole 209 is provided in the seventh region R7, the center joint 108 needs to be present, so the third hole 209 is divided so as not to divide the center joint 108. It is because it is necessary to take the aspect of the made hole part.

  In addition, the reason why the fourth hole 210 is provided in the fifth region R5 is that the fourth hole 210 is made of molten metal when the upper member 20 is manufactured while ensuring the strength and rigidity of the main body 2 sufficiently and sufficiently. This is because it can be formed as a single hole so that the flow does not become complicated, and it can be obtained as a relatively large hole for reducing the weight of the main body 2. For example, if the fourth hole 210 is provided in the sixth region R6, it is necessary to provide a wall thickness for fastening with the bolt 30 that is bolted to the front joint 106 and the front joint 107, This is because the fourth hole portion 210 needs to take the form of a hole portion that is divided so as not to divide the front side joint portion 106 and the front side joint portion 107. In addition, if the fourth hole 210 is provided in the seventh region R7, the center joint 108 needs to be present, so the fourth hole 210 is divided so as not to divide the center joint 108. It is because it is necessary to take the aspect of the made hole part.

  In the vehicle sub-frame in the present embodiment described above, the first straight line L2 connecting the left suspension arm support portion S1 and the right vehicle body side support portion 105, and the right suspension arm support portion S2 and the left vehicle body side support portion 104 are connected. By having the central joint portion 108 located on at least one of the second straight lines L1, the lower member 10 is twisted due to the input load from the left and right suspension arm support portions disposed in the vehicle width direction. Therefore, the input weight from the suspension arm can be efficiently transmitted to the vehicle body side without increasing the cost.

  Further, in the vehicle sub-frame according to the present embodiment, an excessive joint portion is provided by having the central joint portion 108 located at or near the intersection point P of the first straight line L2 and the second straight line L1. Therefore, the input loads from the left suspension arm support S1 and the right suspension arm support S2 can be efficiently transmitted to the vehicle body side.

  Further, in the vehicle sub-frame in the present embodiment, the vehicle body further includes an external force application component support portion 101 that is provided at the center of the vehicle body 2 in the vehicle width direction and is supported by the external force application component. Since it is located in a region between the intersection P and the external force application component support portion 101, buckling of the external force application component support portion 101 can be suppressed.

  In addition, the vehicle subframe according to the present embodiment includes a front joint portion 106 and a front joint portion 107 that are disposed in front of the central joint portion 108 and that form a pair in the width direction. Since the external force application component support portion 101 is disposed in the region surrounded by the portion 106 and the front side joint portion 107, the strength and rigidity around the external force application component support portion are enhanced. Can be further suppressed, and the strength and rigidity of the main body can be enhanced.

  In the present invention, the type, shape, arrangement, number, and the like of the members are not limited to the above-described embodiment, and the gist of the invention is appropriately replaced such that the constituent elements are appropriately replaced with those having the same operational effects. Of course, it can be changed as appropriate without departing from the scope.

  Specifically, in the above embodiment, the external force application component support portion 101 is provided, but the external force application component support portion 101 may not be provided.

  As described above, in the present invention, it is possible to suppress the twisting and distortion of the lower member due to the input load from the left and right suspension arm support portions arranged in the width direction of the vehicle. It is expected that a vehicle subframe that can be transmitted to the vehicle side can be provided, and can be widely applied to a vehicle body such as a vehicle because of its general-purpose universal character.

L1 ... Second straight line L2 ... First straight line M1 ... Left front vehicle body side attachment portion M2 ... Right front vehicle body side attachment portion M3 ... Left rear vehicle body side attachment portion M4 ... Right rear vehicle body side attachment portion P ... Intersection R1 ... First region R2 ... Second region R3 ... Third region R4 ... Fourth region R5 ... Fifth region R6 ... Sixth region R7 ... Seventh region S1 ... Left suspension arm support S2 ... Right suspension arm support S3 ... Left suspension arm support Part S4: Right suspension arm support part 1 ... Vehicle subframe 2 ... Main body part 10 ... Lower member 20 ... Upper member 30 ... Bolt 101 ... External force application component support part 102 ... Through hole 103 ... Through hole 104 ... Left vehicle body side support Part 105: Right vehicle body side support part 106 ... Front side joint part 107 ... Front side joint part 108 ... Center joint part 109 ... First hole part 110 ... Second hole part 111 ... Joint part 120 ... Right connecting member 121 ... Mounting hole 130 ... Left connecting member 131 ... Mounting hole 202 ... Thick part 203 ... Mekura hole 209 ... Third hole 210 ... Fourth hole 301 ... Through hole 302 ... Through hole 303 ... Through hole 304 ... through hole

Claims (2)

An upper member;
A lower member facing the upper member from below and joined to the upper member by a plurality of joints;
With
The upper member and the lower member cooperate to form a main body having a hollow cross section,
The main body is
A left suspension arm support portion disposed on one side and the front side in the width direction of the vehicle;
A right suspension arm support portion disposed on the other side and the front side in the width direction;
A left vehicle body side support portion disposed on one side and the rear side in the width direction;
A right vehicle body support portion disposed on the other side and the rear side in the width direction;
An external force application component support portion provided in the center of the body portion in the width direction and supported by an external force application component;
Have
The plurality of joint portions include: a first straight line connecting the left suspension arm support portion and the right vehicle body side support portion; and a second straight line connecting the right suspension arm support portion and the left vehicle body side support portion . Including a central junction located at or near the intersection,
The central joint is located in a region between the intersection and the external force application component support.
A vehicle subframe characterized by the above. The plurality of joints include a front joint that is disposed in front of the central joint and forms a pair in the width direction,
2. The vehicle subframe according to claim 1 , wherein the external force application component support portion is disposed in a region surrounded by the center joint portion and the front joint portion.

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