JP2005289131A - Vehicle body frame structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve rigidity of a frame and to restrain increase of weight by solving a problem that the rigidity of the frame is low. <P>SOLUTION: A front-sub frame 42 is formed to be a parallel-cross shaped or rectangular frame formed by an aluminum alloy, and is constituted by a front lateral member 62, right and left front joint parts 64 connected to right and left ends of the front lateral member 62, a left vertical member 61 extended backward from the left front joint part 64, a right vertical member 61 extended backward from the right front joint part 64, right and left rear joint parts 71 connected to tips of the right and left vertical members 61, and a rear lateral member 63 connected to the right and left rear joint parts 71. The rear lateral member 63 is formed by a die-cast product, and a steering gear box 141 is supported on the rear lateral member 63. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vehicle body frame structure having a front sub-frame that is mounted on a vehicle body side with a drive system component, a steering component, a suspension component, or the like mounted thereon.

A vehicle body frame structure that includes a front subframe for supporting a drive system component including a power source, a steering component such as a steering gear box, and a suspension component such as a suspension has been put to practical use.
The practical vehicle body frame structure was practically sufficient if the front sub-frame was formed in a substantially cross-beam shape or a substantially rectangular shape so that drive system parts, steering parts, suspension parts, etc. could be mounted.

As such a vehicle body frame structure, a structure using a front subframe made of an extruded material of an aluminum alloy is known (for example, see Patent Document 1).
JP 2000-177621 A (5th page, FIG. 2)

  FIG. 17 is a diagram for explaining a basic configuration of a vehicle body frame structure having a sub-frame formed of a conventional aluminum extruded material. The vehicle body frame structure 310 supports suspension parts such as a drive system component and a suspension including a power source. This is a structure of a subframe (front subframe) 311 for performing the above.

  The sub-frame 311 includes a front frame portion 312, left and right front corner portions 313 and 313 connected to the left and right ends of the front frame portion 312, and a left frame portion 314 extending rearward from the left front corner portion 313. A right frame portion 314 extending rearward from the right front corner portion 313, left and right rear corner portions 315 and 315 respectively connected to tips of the left and right frame portions 314 and 314, and left and right rear corners. A rear frame portion 316 connected to the portions 315 and 315.

  The sub-frame 311 is formed by using an aluminum alloy extruded material for the front frame portion 312 and the rear frame portion 316, the left and right frame portions 314 and 314, the left and right front corner portions 313 and 313, and the left and right rear corner portions. It is formed in a rectangle.

  However, in the vehicle body frame structure 310, the subframe (front subframe) 311 is made of an extruded material of aluminum alloy, so that the rigidity of the entire frame is low, for example, a fixed part such as a steering gear box that generates a large steering reaction force. In addition, it is necessary to increase the plate pressure (thickness) in order to improve the rigidity of the connecting portion to the vehicle body where road surface vibration is input, which causes an increase in vehicle body weight.

  That is, a vehicle body frame structure that can ensure the rigidity of the frame while suppressing an increase in weight is desired.

  An object of the present invention is to provide a vehicle body frame structure that solves the low rigidity of the frame, improves the rigidity of the frame, and suppresses an increase in weight.

  The invention according to claim 1 is a vehicle body frame structure provided with a front subframe that supports a drive system component including a power source, a steering component including a steering gear box, and a suspension part including a front suspension, and is supported on the vehicle body side. The front sub-frame is formed in a substantially cross-shaped or substantially rectangular frame formed of an aluminum alloy, and the front sub-frame is connected to the front horizontal member and the left and right ends of the front horizontal member. The front joint part, the left vertical member extending rearward from the left front joint part, the right vertical member extending rearward from the right front joint part, and the front ends of these left and right vertical members Consists of left and right rear joints and rear lateral members connected to these left and right rear joints, and the rear lateral members are die-cast products Forming Te, and wherein the supporting the steering gear box to the rear transverse member.

  For example, if the rigidity can be improved without increasing the plate pressure, it is preferable because the increase in weight can be suppressed.

  Therefore, the front sub-frame is formed into a substantially cross-shaped or substantially rectangular frame formed of an aluminum alloy, and the front sub-frame is connected to the front horizontal member and the left and right ends of the front horizontal member. The front joint part, the left vertical member extending rearward from the left front joint part, the right vertical member extending rearward from the right front joint part, and the front ends of these left and right vertical members It is composed of left and right rear joint parts and rear lateral members connected to these left and right rear joint parts, and the rear lateral members are formed of die cast products, and the steering gear box is supported by the rear lateral members. The weight increase is suppressed while firmly supporting the steering gear box.

According to a second aspect of the present invention, the left and right rear joint portions and the rear lateral members are integrally formed of a die-cast product, and the left and right front joint portions are formed of a die-cast product. The member is formed of an extruded material.
The left and right rear joints and the rear horizontal members are integrally formed of die-cast products, the left and right front joints are formed of die-cast products, and the front horizontal members and left and right vertical members are formed of extruded material. As a result, the steering gear box can be firmly supported, and even when excessive input acts on the front subframe, it is possible to absorb the impact by the front horizontal member and the left and right vertical members of the extruded material. it can.

  In the invention according to claim 1, the front sub-frame is formed in a substantially cross-girder-shaped or substantially rectangular frame formed of an aluminum alloy, and the front sub-frame includes the front horizontal member and the left and right sides of the front horizontal member. Left and right front joints connected to the end, left vertical member extending rearward from the left front joint part, right vertical member extending rearward from the right front joint part, and these left and right vertical members The left and right rear joints connected to the front ends of the left and right rear joints connected to the left and right rear joints, respectively, are formed of die-cast products, and the steering gear is attached to the rear lateral member. By supporting the box, the weight of the steering gear box is firmly supported while suppressing an increase in weight. As a result, there is an advantage that vibration of the steering gear box can be suppressed and an increase in weight of the front subframe can be suppressed.

  In the invention according to claim 2, the left and right rear joint portions and the rear lateral members are integrally formed of a die cast product, and the left and right front joint portions are formed of a die cast product. Since the member is made of extruded material, the steering gear box can be firmly supported, and even if excessive input acts on the front subframe, the front horizontal member and left and right vertical members of the extruded material Shock absorption can be achieved. As a result, there is an advantage that the impact on the steering gear box can be minimized.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. “Front”, “Rear”, “Left”, “Right”, “Up”, “Down” follow the direction seen from the driver, Fr is front, Rr is rear, L is left, R is right , CL indicates the vehicle body center (vehicle width center).

First, an outline of the vehicle will be described with reference to FIGS.
FIG. 1 is a perspective view of a front portion of a vehicle according to the present invention. The vehicle body frame (vehicle body) 20 of the vehicle 10 has a front structure with left and right front side frames 21 and 21 extending in front and rear of the vehicle body on both sides of the front of the vehicle body, and on the outer side in the vehicle width direction of these front side frames 21 and 21. In addition, left and right upper frames 22 and 22 extending in the longitudinal direction of the vehicle body above and below, left and right front damper housings 23 and 23 spanned between the front side frames 21 and 21 and the upper frames 22 and 22, and left and right front sides This is a monocoque body mainly composed of the front bulkhead 24 coupled to the front portions of the frames 21 and 21 and the front portions of the left and right upper frames 22 and 22.

The front bulkhead 24 includes a lower cross member 25 extending in the vehicle width direction below the front portions of the left and right front side frames 21, 21, and left and right side stays 26, 26 extending upward from both ends of the lower cross member 25. The upper cross member 27 extending in the vehicle width direction so as to be coupled to the upper ends of the side stays 26 and 26 is a main component.
The upper cross member 27 is formed by extending left and right extension portions 28 and 28 obliquely rearward from both left and right end portions, and is coupled to the left and right upper frames 22 and 22 in the middle along the extension portions 28 and 28.

  Such a vehicle body frame 20 includes front and rear, left and right front parts of the left and right front side frames 21 and 21 and front end parts of the left and right floor frames 31 and 31 extending rearward from the rear ends of the front side frames 21 and 21. The front sub-frame 42 is suspended through four anti-vibration elastic bushes 41 (... indicates a plurality, the same applies hereinafter).

  FIG. 2 is a perspective view around the front side frame according to the present invention. The front subframe 42 has a horizontally placed engine (power source) 43 mounted on the right half and a transmission 44 mounted on the left half. The transmission 44 extends the propeller shaft 45 rearward from the output side to transmit power.

FIG. 3 is a perspective view of the rear part of the vehicle according to the present invention. The rear part of the vehicle body frame 20 is mainly composed of left and right rear side frames 51, 51 extending in the longitudinal direction on both sides of the rear part of the vehicle body. The rear side frames 51, 51 are provided with four vibration-proof elastic bushes 52,. The rear sub-frame 53 is suspended via
The rear subframe 53 has a rear differential gear box 54 attached thereto in a suspended manner. Of the rear sub-frame 53, the front side horizontal member 202 on the front side is curved so that both ends are horizontal and the central part protrudes upward in order to avoid interference with the rear differential gear box 54, that is, an arch shape. Presents. Reference numeral 201 denotes a vertical member, and 203 denotes a rear horizontal member.

  The power transmitted from the propeller shaft 45 (see FIG. 2) can be distributed and transmitted to the left and right rear wheels by the left and right drive shafts via the rear differential gear in the rear differential gear box 54. As is apparent from the above description and FIGS. 2 and 3, the vehicle 10 is a four-wheel drive vehicle that drives the front and rear wheels with the engine (power source) 43 mounted on the front portion of the vehicle body.

  Next, the overall configuration of the front subframe 42 will be described with reference to FIGS. FIG. 4 is a perspective view of the front sub-frame according to the present invention. FIG. 5 is an explanatory diagram of materials of each member constituting the front subframe according to the present invention. FIG. 6 is a plan view of the front sub-frame according to the present invention. FIG. 7 is an exploded perspective view of the front subframe according to the present invention.

As shown in FIGS. 4 and 5, the front subframe 42 is a metal material product, for example, an aluminum product or an aluminum alloy product (hereinafter collectively referred to as “aluminum alloy product”). Among the members shown in FIG. 5, the white material indicates an extruded material (extruded product) or a drawn material (pultruded product) as a wrought material, and the satin pattern material indicates a die-cast product.
Here, the wrought material is a plate, strip, painted plate, painted strip, rod, wire, seamless tube, welded tube, extruded profile, forged product, foil, welding rod formed of aluminum and aluminum alloy. Including all wires.

  As shown in FIGS. 4, 6, and 7, the front sub-frame 42 has a substantially cross-beam shape (# shape) or a square shape in plan view, and left and right vertical members 61, 61 extending in the front-rear direction of the vehicle body. The front horizontal member 62 extending in the left-right direction of the vehicle body to be bridged between the front ends of the vertical members 61, 61 and the rear horizontal member extending in the horizontal direction of the vehicle body to be spanned between the rear ends of the left and right vertical members 61, 61 63, left and right first connecting members 64, 64 as left and right front joints connecting the ends of the front horizontal member 62 to the front ends of the left and right vertical members 61, 61, and left and right vertical members 61, 61 Left and right abutting plates 65, 65 (see FIG. 7) covering the lower end surface of the rear end portion, and left and right second members for connecting the end portions of the rear horizontal member 63 to the rear end portions of the left and right vertical members 61, 61, respectively. And connecting members (joining members) 66 and 66 (see FIG. 7).

  The left and right vertical members 61 and 61 are side members of a molded product in which, for example, a square pipe made of a cylindrical extruded material (extruded molded product) is partially formed into an uneven shape by bulge molding or the like. The front horizontal member 62 is a round pipe cross member made of, for example, a cylindrical extruded material (extruded product). The left and right first connecting members 64 and 64 are die-cast products having a substantially L shape in a plan view, and are integrally formed with a vehicle body attachment portion 64b having a through hole 64a vertically passing through a corner. The vertical members 61 and 61 and the front horizontal member 62 can be inserted into the left and right first connecting members 64 and 64 and joined together.

  The rear horizontal member 63 is a cross member made of a die-cast product having a substantially H shape in plan view. More specifically, the rear lateral member 63 has a substantially U-shaped cross section when viewed from the side, is curved in an arc shape that protrudes upward, and has left and right ends that extend in the longitudinal direction of the vehicle body. The left and right sub-vertical members 71, 71 as rear joint portions are formed integrally.

  As shown in FIG. 7, the left and right sub-vertical members (left and right rear joint portions) 71, 71 are downward U-shaped cross-sections, and the vehicle body attachment portions 73, 73 having through holes 72, 72 penetrating vertically at the rear portion. Are integrally formed. On the other hand, the left and right contact plates 65, 65 are upward U-shaped cross sections. The auxiliary vertical members 71 and 71 can be made into a closed section by overlapping and joining the contact plates 65 and 65 on at least the first half part of the lower surfaces of the left and right auxiliary vertical members 71 and 71.

Further, (1) the left and right vertical members 61, 61 are joined to the front end portions of the left and right sub-vertical members (left and right rear joint portions) 71, 71, and (2) the left and right vertical members 61, The second connecting members (joining members) 66 and 66 are overlapped and joined to the lower surface of the rear end portion of the 61 and the lower surface of the front end portion of the abutting plates 65 and 65, so that (3) both ends of the rear lateral member 63 The vertical members 61 and 61 can be integrally joined to each other.
As is clear from the above description, the sub-vertical members (left and right rear joint portions) 71 and 71 and the contact plates 65 and 65 are used for integrally joining the vertical members 61 and 61 to both ends of the rear horizontal member 63. In addition to serving as a connecting member, it also serves as the vertical members 61 and 61.

Such a rear horizontal member 63 includes a plurality of (for example, four front, rear, left and right) first boss portions 74 that protrude upward from the left and right ends of the front edge and the rear edge, and the front edge and the rear portion. Are integrally provided with a plurality of second boss portions 75.
The left and right sub-vertical members (left and right rear joint portions) 71, 71 are each of three arm mounting portions 76 as a connecting portion of an adjustment mechanism that adjusts the camber angle protruding upward at the front upper portion, Stabilizer bracket mounting portions 77 and 77 bulging upward at the upper rear portion and positioning holes 78 and 78 as positioning mechanisms used when attaching the front sub frame 42 to the vehicle body frame 20 (see FIG. 1) are integrated. Prepare for. The camber angle adjustment mechanism as the adjustment mechanism will be described in detail with reference to FIGS.

By the way, the left and right vertical members 61, 61 have brackets (concave portions) 81, 81 (see FIG. 8) that are open to the outside in the vehicle body width direction. The left vertical member 61 includes a die-cast cover 83 that closes a transmission supporting opening 82 that is open at the top.
The front horizontal member 62 has a power plant support portion 84 attached to the upper center and a jack-up portion 85 attached to the lower center.

Next, the bracket 81 provided on the left vertical member 61 will be described with reference to FIGS. 4, 8, and 9. Note that the bracket 81 provided on the right vertical member 61 has the same configuration as that on the left, and a description thereof will be omitted.
FIGS. 8A and 8B are configuration diagrams of the left vertical member according to the present invention, FIG. 8A shows the configuration of the main part of the left vertical member 61, and FIG. The principal part structure of the vertical member 61 fractured | ruptured by the bb line of (a) is shown.
9A and 9B are configuration diagrams of the left vertical member according to the present invention. FIG. 9A shows a cross-sectional configuration taken along line bb in FIG. FIG. 9B shows a bush mounting structure in which the elastic bush 100 is mounted on the cross-sectional portion of FIG.

As shown in FIGS. 8 and 9A, the left vertical member 61 is a frame formed of a cylindrical member, and the cylindrical member is composed of an upper plate 91, an outer side plate 92, a lower plate 93, and an inner side. The side plate 94 is a member formed in a substantially rectangular closed cross section. The outer side plate 92 corresponds to the left side surface of the front sub-frame 42 shown in FIG.
Such a left vertical member 61 is configured in the middle of the longitudinal direction so that the cross-sectional shape in the direction perpendicular to the axis is recessed toward the inside of the cross section as shown in FIG. At the same time, a through hole 97 a is formed in the bottom 97 of the recess 81.

  The concrete structure of the recess 81 is that the outer side plate 92 is folded back from the edge of the upper plate 91 and the edge of the lower plate 93 into a closed cross section, and the upper and lower plates are moved inward through the upper and lower folded portions 95, 95. The upper and lower bracket plate portions 96, 96 are extended along the plates 91, 93, the bottom 97 is between the extended tips, and a through hole 97 a is opened in the bottom 97.

The upper bracket plate portion 96 is a flat plate in contact with the inner surface of the upper plate 91, and the lower bracket plate portion 96 is a flat plate in contact with the inner surface of the lower plate 93. In this manner, the upper and lower bracket plate portions 96 and 96 can be formed on the inner surface of the recess 81.
As shown in FIG. 9, the bottom 97 is a flat plate substantially parallel to the inner side plate 94 at a position having a certain gap from the inner side plate 94. The through hole 97 a is a large hole that opens to the vicinity of the upper and lower edges of the bottom 97. Since the bottom 97 is less affected by external force, the vertical member 61 can be reduced in weight by opening the through hole 97a.

  As shown in FIG. 9 (a), the folded portions 95, 95 have an annular cross-sectional shape that slightly bulges up and down from the edge of the upper plate / lower plate 91, 93 to the bracket plate portions 96, 96. It is the part that turned back to. Therefore, the folded portions 95, 95 have certain space portions S1, S1. Therefore, it can be said that the folded portions 95 and 95 are portions formed continuously with the vertical member 61 that is a cylindrical member. The turned-up portions 95 and 95 and the bracket plate portions 96 and 96 face each other through the fixed space portions S1 and S1.

  As is clear from the above description, the recess 81, that is, the bracket 81, has bracket plate portions 96 and 96, and folded portions 95 and 95 that are folded back from the bracket plate portions 96 and 96. Thus, the bracket 81 is characterized in that it is integrally provided in the middle of the longitudinal member 61 (see FIG. 8A) formed of a cylindrical frame. Furthermore, the bracket 81 has a bolt through-hole 98 penetrating vertically. The bolt through hole 98 penetrates the upper plate 91, the lower plate 93 and the upper and lower bracket plate portions 96, 96.

  FIG. 9B shows a bush mounting structure in which the elastic bush 100 is mounted on the vertical member 61 with a bracket 81. The elastic bush 100 is a vibration isolating member having a configuration in which an inner cylinder 101 and an outer cylinder 102 surrounding the inner cylinder 101 are connected by an elastic body 103 such as a rubber, and an arm member such as a lower arm of a front suspension is connected to the outer cylinder 102. 112 is integrally provided.

The bracket 81 is arranged so that both ends of the inner cylinder 101 are sandwiched between bracket plate portions 96 and 96, and are attached by bolts 104 through the inner cylinder 101 and bolt through holes 98. . The upper and lower bracket plate portions 96, 96 have a flat surface in contact with each end surface of the inner cylinder 101.
The upper plate 91 and the upper bracket plate portion 96 are overlapped with each other, and the lower plate 93 and the lower bracket plate portion 96 are overlapped to increase rigidity, and the elastic bush 100 is fastened by two plates on the upper and lower sides. Can support.

Next, the configuration around the front sub-frame 42 and the front suspension 110 will be described with reference to FIGS. Since the left and right front suspensions 110, 110 have the same configuration, only the left side will be described and the right side will be omitted.
FIG. 10 is a perspective view in which the front suspension and the steering gear box are attached to the front subframe according to the present invention.
FIG. 11 is a plan view of a main part in which a front suspension is attached to a front subframe according to the present invention.
FIG. 12 is an exploded view of the front subframe, the front suspension, and the steering gear box according to the present invention.

  As shown in FIG. 10, the left front suspension 110 swings to an upper arm 111 attached to the front side frame 21 so as to be swingable up and down, a left vertical member 61 and a left sub-vertical member (left rear joint portion) 71. The main body frame 20 includes a lower arm 112 that can be attached, a front cushion 113 that is attached between the lower arm 112 and the front damper housing 23 (see FIG. 1), and an upper arm 111 and a knuckle 114 that is connected to the lower arm 112. This is a front wheel suspension device for suspending the front wheel on the front.

As shown in FIGS. 10 to 12, the lower arm 112 is a substantially Y-shaped member in plan view that extends from the knuckle coupling portion 121 that couples the knuckle 114 to the front front arm 122 and the rear rear arm 123. It is. The tip of the front arm 122 is attached to the bracket 81 of the vertical member 61 via the elastic bush 100 so as to be able to swing up and down with a bolt 104 (see also FIG. 9B). On the other hand, the front end portion of the rear arm 123 is attached to the rear bracket 124 via an elastic bush (not shown) so that it can swing up and down with a bolt 125. The rear bracket 124 is attached to the arm attaching portions 76... Of the sub vertical member (rear joint portion) 71 with bolts 126.

  The sub-vertical member (rear joint portion) 71 is obtained by attaching a stabilizer bracket 131 to the stabilizer bracket attaching portion 77 with bolts 132 and 132. The stabilizer bracket 131 is a member that supports a rod-shaped stabilizer 133 that connects the left and right lower arms 112 (only the left is shown).

  The rear lateral member 63 also serves as a member for fixing the steering gear box 141 extending in the left-right direction of the vehicle body. The steering gear box 141 is a member that houses a gear mechanism (for example, a power steering gear mechanism) for converting a steering force of a steering handle (not shown) into a steering force in the left-right direction of the vehicle body and taking it out from the tie rod 142. The tie rod 142 is connected to the arm 114a of the knuckle 114.

  A steering gear box 141 and an aluminum die-cast cover 143 are stacked on the rear side member 63 in this order from above, and these members are fastened to the first boss portions 74 with bolts 144. The steering gear box 141 can be attached to the front subframe 42 by fixing the cover 143 to the two boss portions 75 with bolts 145.

The anti-vibration elastic bush 41 that mounts the four corners of the front sub-frame 42 at the lower part of the vehicle body frame 20 (see FIG. 1) includes upper and lower elastic bush members 151 and 152 and mounting bolts 153.
The transmission supporting opening 82 of the left vertical member 61 is for attaching an anti-vibration elastic bush 161 to the cover 83 with bolts 162. The elastic bush 161 is a member for mounting the transmission 44 (see FIG. 2) on the front subframe 42.

  FIG. 13 is a plan view of the camber angle adjusting mechanism of the vehicle body frame structure according to the present invention. The camber angle adjusting mechanism (adjusting mechanism) 157 is a sub-vertical member 71 of the left vertical member 61 (hereinafter referred to as “left rear joint”). 4 (hereinafter referred to as “connecting portion 76...”) Formed on the connecting portion 76... And a rear bracket 124 attached to the connecting portion 76. And a bolt 126 for mounting the bracket in an adjustable manner, and a rear bracket 124 that is swingably supported via a bolt 125, and a bracket (recess) 81 shown in FIG. The lower arm 112 is attached to the elastic bush 100, and the bolt 104 is supported to deformably support the elastic bush 100.

That is, the camber angle adjusting mechanism 157 includes the long holes 158... Fitted into the bolts 126... In the rear bracket 124 and the long holes 163 fitted into the bolts 104 in the elastic bush 100. The attachment position of 112 can be adjusted.
It is assumed that a camber angle adjusting mechanism 157 and a camber angle adjusting mechanism symmetrical with respect to the center of the vehicle body are provided on the right side of the sub front frame 42.

FIGS. 14A to 14D are operation explanatory views of the camber angle adjusting mechanism of the vehicle body frame structure according to the present invention.
FIG. 6A shows a state where the rear bracket 124 of the camber angle adjusting mechanism 157 is attached to the inside of the vehicle body.
In (b), by attaching the rear bracket 124 to the inside of the vehicle body, the lower arm 121 can be pulled to the inside of the vehicle body as shown by the arrow a1. As a result, the camber angle θ can be set small. Reference numeral 164 denotes an axle, and 165 denotes a front wheel.

FIG. 6C shows a state where the rear bracket 124 of the camber angle adjusting mechanism 157 is attached to the outside of the vehicle body.
In (d), by attaching the rear bracket 124 to the outside of the vehicle body, the lower arm 121 can be projected to the outside of the vehicle body as indicated by an arrow a2. As a result, the camber angle θ can be set large.

FIGS. 15A to 15D are operation explanatory views of the positioning mechanism of the vehicle body frame structure according to the present invention, and show an example of an assembly method when the front sub frame 42 is assembled to the vehicle body frame 20.
In (a), the front subframe assembling method includes a lift device 168 for lifting (raising) the front subframe 42 toward the vehicle body frame 20, providing a reference hole 166 in the vehicle body frame 20, and positioning to the front subframe 42. A hole (positioning mechanism) 78 is provided, and a jig pin 167 for aligning the positioning hole 78 in the reference hole 166 is provided in the lift device 168, thereby assembling the front subframe 42 in alignment with the vehicle body frame 20. .

  In (b), the lifting device 168 is lifted (raised) as indicated by the arrow b 1, thereby positioning the positioning hole 78 of the front subframe 42 in the jig pin 167 of the lifting device 168.

In (c), the lifting device 168 and the front sub-frame 42 are lifted (raised) as indicated by the arrow b 2, thereby positioning the jig pin 167 of the lifting device 168 in the reference hole 166 of the vehicle body frame 20. In this lifted state, the front sub-frame 42 is attached (fixed) to the vehicle body frame 20.
In (d), the lift device 168 is lowered as shown by the arrow b3 to complete the assembly of the front subframe 42.

FIG. 16 is a perspective view of a state in which a suspension, a steering gear box, and a stabilizer are mounted on the front subframe of the vehicle body frame structure according to the present invention.
The vehicle body frame structure according to the present invention supports driving system parts including a power source (engine) 43 (see FIG. 2), steering parts including a steering gear box 141, and suspension parts including a front suspension 110, and FIG. In the vehicle body frame structure including the front subframe 42 supported on the vehicle body frame (vehicle body) 20 side shown in FIG. 1, the front subframe 42 is formed in a substantially cross-shaped or substantially rectangular frame formed of an aluminum alloy, and The horizontal member 62, the left and right first connecting portions 64, 64 connected to the left and right ends of the front horizontal member 62 (hereinafter referred to as “left and right front joint portions 64, 64”), the left front The left vertical member 61 extending rearward from the joint portion 64, the right vertical member 61 extending rearward from the right front joint portion 64, and these Left and right sub-vertical members 71 and 71 (hereinafter referred to as “left and right rear joint portions 71 and 71”) connected to the distal ends of the right vertical members 61 and 61, and these left and right rear joint portions 71 and 71, respectively. It can be said that the rear lateral member 63 is connected to each other, the rear lateral member 63 is formed of a die-cast product, and the steering gear box 141 is supported by the rear lateral member 63.

  For example, if the rigidity can be improved without increasing the plate pressure, it is preferable because the increase in weight can be suppressed.

  Therefore, the front sub-frame 42 is formed in a substantially cross-shaped or substantially rectangular frame made of an aluminum alloy, and the front left and right front members 62 and the left and right front ends connected to the left and right end portions of the front horizontal member 62 are configured. The joint portions 64, 64, the left vertical member 61 extending rearward from the left front joint portion 64, the right vertical member 61 extending rearward from the right front joint portion 64, and the left and right vertical members 61 , 61 and left and right rear joint portions 71, 71 connected to the distal ends of the left and right rear joint portions 71, 71, and rear lateral members 63 connected to each other. The rear lateral member 63 is formed into a die-cast product. By supporting the steering gear box 141 on the rear lateral member 63, the weight increase can be suppressed while firmly supporting the steering gear box 141. .

  As a result, vibration of the steering gear box 141 can be suppressed (the steering rigidity can be improved), and an increase in the weight of the front subframe 42 can be suppressed.

  Further, in the vehicle body frame structure according to the present invention, the left and right rear joint portions 71 and 71 and the rear lateral member 63 are integrally formed of a die cast product, and the left and right front joint portions 64 and 64 are formed of a die cast product. It can also be said that the front horizontal member 62 and the left and right vertical members 61, 61 are formed of extruded material.

  The left and right rear joint portions 71 and 71 and the rear horizontal member 63 are integrally formed of a die cast product, and the left and right front joint portions 64 and 64 are formed of a die cast product, and the front horizontal member 62 and the left and right vertical members 63 By forming the members 61, 61 with an extruded material, the steering gear box 141 can be firmly supported, and even when an excessive input acts on the front subframe 42, the front lateral member of the extruded material. The impact can be absorbed by the 62 and the left and right vertical members 61 and 61. As a result, the impact on the steering gear box can be minimized.

  The vehicle body frame structure according to the present invention is a vehicle body frame structure provided with a front subframe 42 as shown in FIG. 4, but is not limited to this, and is a rear subframe that supports the periphery of the rear wheel. There may be.

  In the vehicle body frame structure according to the present invention, as shown in FIG. 7, the left and right rear joint portions 71, 71 are integrally formed with an aluminum alloy die cast product on the rear lateral member 63, but this is not restrictive. The left and right rear joint portions may include a part of the vertical member. That is, the left and right rear joint portions (sub-vertical members) 71, 71 may include a vertical member function and a joint function.

  As shown in FIG. 13, the adjustment mechanism of the vehicle body frame structure according to the present invention is the camber angle adjustment mechanism 157. However, the adjustment mechanism is not limited to this, and the adjustment mechanism is a caster angle adjustment mechanism for adjusting the caster angle. It may be.

  The vehicle body frame structure according to the present invention is suitable for use in a vehicle such as a four-wheel drive vehicle in which a drive system component including a power source, a steering component such as a steering, and a suspension component such as a suspension are attached to the frame.

It is a perspective view of the front part of the vehicle concerning the present invention. It is a perspective view around the front side frame according to the present invention. It is a perspective view of the rear part of the vehicle concerning the present invention. It is a perspective view of the front subframe concerning the present invention. It is material explanatory drawing of each member which comprises the front sub-frame which concerns on this invention. It is a top view of the front subframe concerning the present invention. It is a disassembled perspective view of the front sub-frame which concerns on this invention. It is a block diagram of the left vertical member which concerns on this invention. It is a block diagram of the left vertical member which concerns on this invention. It is the perspective view which attached the front suspension and the steering gear box to the front sub-frame which concerns on this invention. It is a principal part top view which attached the front suspension to the front sub-frame which concerns on this invention. FIG. 4 is an exploded view of a front suspension and a steering gear box in the front subframe according to the present invention. It is a top view of the camber angle adjustment mechanism of the vehicle body frame structure according to the present invention. It is action | operation explanatory drawing of the camber angle adjustment mechanism of the vehicle body frame structure which concerns on this invention. It is action | operation explanatory drawing of the positioning mechanism of the vehicle body frame structure which concerns on this invention. FIG. 3 is a perspective view of a state in which a suspension, a steering gear box, and a stabilizer are mounted on the front subframe of the vehicle body frame structure according to the present invention. It is a figure explaining the basic composition of the body frame structure which has the subframe formed with the conventional aluminum extrusion material.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Vehicle, 20 ... Body frame, 42 ... Front sub-frame, 43 ... Power source (engine), 61 ... Left and right vertical member, 62 ... Front side horizontal member, 63 ... Rear side member, 64 ... Left and right front joint part (First connecting member), 71 ... left and right rear joint parts (sub vertical members), 76 ... connecting part (arm mounting part), 78 ... positioning hole (positioning mechanism), 110 ... front suspension, 141 ... steering gear box, 157 ... Adjustment mechanism (camber angle adjustment mechanism).

Claims (2)

In a vehicle body frame structure including a front subframe that supports a drive system component including a power source, a steering component including a steering gear box, a suspension part including a front suspension, and a vehicle body side,
The front sub-frame is a substantially cross-shaped or substantially rectangular frame formed of an aluminum alloy, a front horizontal member, left and right front joints connected to the left and right ends of the front horizontal member, The left vertical member extending rearward from the front joint, the right vertical member extending rearward from the right front joint, the left and right rear joints respectively connected to the ends of the left and right vertical members, and And rear lateral members connected to the left and right rear joints,
A vehicle frame structure, wherein the rear lateral member is formed of a die-cast product, and the steering gear box is supported by the rear lateral member. The left and right rear joints and the rear horizontal members are integrally formed of die cast products, and the left and right front joints are formed of die cast products, and the front horizontal members and the left and right vertical members are formed of extruded material. The vehicle frame structure according to claim 1, wherein:

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