JP5911174B2 - Subframe for vehicle - Google Patents

Description

  The present invention relates to a vehicle subframe that supports a suspension device for front wheels and is attached to the left and right side frames extending in the vehicle front-rear direction.

  The vehicle subframe includes a pair of side members that are arranged at intervals in the vehicle width direction and extend in the vehicle front-rear direction, a front cross member that connects the front ends of these side members, and a rear end of the side members. There is a rear cross member that is connected, and a protrusion member that protrudes downward or obliquely forward is provided in front of the front cross member.

  According to this vehicular subframe, since the front cross member is provided with the protruding member (riding structure) protruding downward or obliquely forward, when moving down the step while retreating, for example, the front of the front cross member It is possible to prevent contact between the radiator and the road surface (see, for example, Patent Document 1).

  In addition, the vehicle sub-frame is formed by combining aluminum alloy die-cast products and extruded materials to form a substantially cross-girder shape or a substantially rectangular frame, and the left and right sides arranged in a substantially cross-girder shape or a substantially rectangular corner. Some include a front joint part and left and right rear joint parts, and left and right vertical members and front and rear cross members connected by these joint parts.

  According to this subframe for a vehicle, since it is formed by combining an aluminum alloy die-cast product and an extruded material, it is possible to construct a frame that conforms to actual specifications and to partially improve the rigidity of the frame. (For example, refer to Patent Document 2).

JP 2007-186120 A JP-A-2005-289126

  In the vehicle subframe of Patent Document 1, a separate protrusion member (riding structure) is provided in front of the front cross member. For this reason, the configuration of the vehicle subframe becomes complicated.

  The vehicle sub-frame of Patent Document 2 is formed by combining an aluminum alloy die-cast product and an extruded material. That is, an extruded material (aluminum expanded material) is used for the previous cross member.

  When the combined structure is used as described above, it is necessary to couple by bolt fastening or welding. In the case of bolt connection, the number of parts increases and the vehicle weight increases. When joining by welding, it is difficult to maintain accuracy due to distortion caused by heat input.

  It is an object of the present invention to provide a vehicle subframe that can reduce the number of parts, reduce the weight of the vehicle body, and improve the precision of the parts. It is another object of the present invention to provide a vehicle subframe that can be simply configured when a ride structure such as a protruding member is attached to the vehicle subframe.

The invention according to claim 1 is the vehicle subframe that supports the suspension device for the front wheels and is attached to the left and right side frames extending in the vehicle front-rear direction. The front edge of the cross member of the vehicle subframe is the front edge. have a sloped portion inclined downwardly toward the rear from the front end, the leading edge is a portion having a width in the longitudinal direction of the vehicle, a space that is open obliquely forward extending in the vehicle width direction, the space vehicle And a plurality of ribs that are divided into a plurality of portions in the width direction, and the inclined portion is formed in the plurality of ribs .

The present invention has the following effects.
In the invention according to claim 1, the vehicle sub-frame is attached to the left and right side frames that support the suspension device for the front wheels and extend in the vehicle front-rear direction. Since the front edge of the cross member of the vehicle subframe has an inclined portion that is inclined downward from the front end of the front edge toward the rear end, a riding structure is provided at the front lower end of the vehicle subframe without using a separate member. Can be configured. As a result, the vehicle subframe has a low impact when it rides on a curb or the like while the vehicle is running, without forming the vehicle subframe by combining, for example, an aluminum alloy die-cast product and an extruding material such as an extruded material. Can be integrally formed with an aluminum casting. As a result, the number of parts can be reduced and the weight of the vehicle body can be reduced as compared with the case where the vehicle subframe is formed with the combined structure. Moreover, since it is an integral molding, the component accuracy can be improved as compared with the case of combining by welding.

In the invention according to claim 1 , the front edge is a portion having a width in the vehicle front-rear direction. Since the front edge has a space portion that extends in the vehicle width direction and opens obliquely forward, and a plurality of ribs that divide the space portion into a plurality of spaces in the vehicle width direction, and the inclined portion is formed into a plurality of ribs, The edge part which is the riding-up structure of the vehicle subframe can be simply configured. Further, since the structure has a space portion at the edge portion and the space portion is partitioned by a plurality of ribs, the weight of the vehicle body can be reduced.

It is a top view which shows the vehicle by which the vehicle sub-frame which concerns on this invention was employ | adopted. It is the perspective view seen from the front left side of the vehicle shown by FIG. It is the perspective view seen from the front right side of the vehicle shown by FIG. It is a side view by which the attachment state of the vehicle sub-frame of Example 1 which concerns on this invention is shown. It is the perspective view which looked at the sub-frame for vehicles shown by FIG. 4 from the downward direction. FIG. 5 is a bottom view of the vehicle subframe shown in FIG. 4. It is the perspective view seen from the downward direction of the sub-frame for vehicles shown by FIG. FIG. 8 is an enlarged view of 8 parts in FIG. 7. FIG. 9 is a cross-sectional view taken along line 9-9 in FIG. 7. FIG. 10 is a cross-sectional view taken along line 10-10 in FIG. FIG. 5 is an operation explanatory diagram of the vehicle subframe shown in FIG. 4. It is a bottom view of the sub-frame for vehicles of Example 2 which concerns on this invention. FIG. 13 is a perspective view of the vehicle subframe shown in FIG. 12. FIG. 14 is a cross-sectional view taken along line 14-14 of FIG.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  As shown in FIGS. 1 to 3, the vehicle 10 includes a vehicle body 11 having left and right front side frames (left and right side frames) 15 extending in the vehicle front-rear direction and vehicle width inner sides of the left and right front side frames 15. Left and right floor frames 17 extending in the vehicle rearward direction, subframes (vehicle subframes) 20 supported on the left and right front side frames 15 side, and left and right suspension devices 18 supported on the side portions of the subframes 20. (The right suspension device is not shown), a steering device 19 placed on the subframe 20, and a torque rod 22 that supports a power unit (not shown).

  The vehicle 10 is a left-hand drive vehicle. The subframe 20 is a front subframe that is provided at the front portion of the vehicle 10 and supports the suspension device 18, the gear box 47 of the steering device 19, a power unit (not shown), and the like.

  The front side frame 15 includes a straight portion 26 provided in front of the vehicle and linearly extending rearward of the vehicle, a side frame inclined portion 27 provided in the rear of the vehicle and inclined downward toward the rear of the vehicle, and a front portion of the straight portion 26. To the front of the vehicle and outwardly from the vehicle width.

  The rear portion of the straight portion 26 is provided with a front end support portion 32 that supports the front end of the subframe 20. The rear portion of the side frame inclined portion 27 is provided with the connecting member 16 in the vehicle width direction, and the rear end support portion 33 that supports the rear end of the subframe 20 is provided on the connecting member 16.

  It can be said that the rear end support portion 33 is attached to the front side frame 15 via the connecting member 16 at the rear end of the subframe 20. The floor frame 17 extends from the inner side of the connecting member 16 in the vehicle width direction to the rear of the vehicle.

  The suspension device 18 includes a lower arm 35 that swingably supports the lower part of the knuckle 25 of the front wheel 24, an upper arm (not shown) that supports the upper part of the knuckle 25, and an upper arm (upper part of the knuckle 25) and the vehicle body 11. And a damper unit 36 interposed therebetween. The damper unit 36 includes a spring 41 that softens the impact from the front wheel 24 and a damper main body 42 that converges expansion and contraction of the spring 41. Further, a stabilizer 37 that suppresses the roll of the vehicle body 11 is provided between the left and right suspension devices 18.

  The steering device 19 includes a steering wheel 44 gripped by an occupant, a steering shaft 45 extending from the steering wheel 44, a steering column 46 that supports the steering shaft 45, and a gear connected to the steering shaft 45 via a universal joint 43. The box 47 includes tie rods 48 and 48 (one not shown) protruding from the gear box 47, and knuckle arms 49 and 49 provided outside the vehicle width of the tie rods 48 and 48.

  The gear box 47 is formed with first to third box attachment portions 51 to 53 attached to the subframe 20. The steering shaft 45 includes a wheel side shaft 54 and a gear box side shaft 56 connected to the wheel side shaft 54 via a shaft joint (universal joint) 55.

  The torque rod 22 is a rod for stopping vibrations generated in a power unit (not shown) or the like during acceleration and deceleration. The torque rod 22 includes an engine side support portion 38 that supports the power unit (engine) and a rod rear end attachment portion 39 that is attached to the subframe 20.

  As shown in FIGS. 1 to 6, the subframe 20 includes a cross member (front lateral member portion) 61 extending in the vehicle width direction, a cross member (rear lateral member portion) 62 extending in the vehicle width direction, and a vehicle. Left and right vertical members (left and right vertical member portions) 63 and 64 extending in the front-rear direction, and a center surface portion 65 surrounded by the cross members 61 and 62 and the left and right vertical members 63 and 64 are configured.

  The subframe 20 is a vehicle subframe made of aluminum cast (die-cast) in which cross members 61 and 62, left and right vertical members 63 and 64, and a central surface portion 65 are integrally formed.

  Here, the range indicated by the dimension L1 in the vehicle longitudinal direction and the dimension D1 in the vehicle width direction is defined as the cross member 61 (see FIG. 6), and the range indicated by the dimension L2 in the vehicle longitudinal direction and the dimension D1 in the vehicle width direction. Is defined as a cross member 62, and a range indicated by a dimension L3 in the vehicle longitudinal direction and a dimension D2 in the vehicle width direction is defined as a left vertical member (left vertical member portion) 63. A range indicated by the dimension D3 in the width direction is defined as a right vertical member (right vertical member portion) 64, a dimension L4 is defined in the vehicle front-rear direction, and a range indicated by the dimension D1 in the vehicle width direction is defined as a center plane portion 65. .

  The cross member 61 is formed with a rod support portion 67 that supports the rod rear end mounting portion 39 of the torque rod 22. An edge (front edge) 68 extending in the vehicle width direction is formed at the front end of the cross member 61. The cross member 62 has an arcuate trailing edge 69 at the rear end in plan view.

  The left vertical member 63 includes a front attachment portion 71 attached to the front end support portion 32 of the front side frame 15, a rear attachment portion 72 attached to the rear end support portion 33 of the connecting member 16, and a lower arm 35 that can swing freely. The arm support part 73 to be supported and the first and second support parts 74 and 75 for supporting the first and second box mounting parts 51 and 52 of the gear box 47 are formed.

  The front mounting portion 71 includes an arm portion 77 that extends integrally upward from the left vertical member 63 and a mounting piece 78 that is formed as a separate piece. The front mounting portion 71 is supported by the bolt 91 on the front end support portion 32 of the front side frame 15. The rear mounting portion 72 is supported by the bolt 92 on the rear end support portion 33 of the connecting member 16. The gear box 47 is fastened to the first and second support portions 74 and 75 with bolts 94 and 95, respectively.

  The right vertical member 64 includes a front attachment portion 81 attached to the front end support portion 32 of the front side frame 15, a rear attachment portion 82 attached to the rear end support portion 33 of the connecting member 16, and a lower arm 35 that can swing. An arm support portion 83 to be supported and a third support portion 84 that supports the third box mounting portion 53 of the gear box 47 are formed.

  The front mounting portion 81 includes an arm portion 87 that integrally extends upward from the right vertical member 64 and a mounting piece 88 that is formed as a separate piece. The front mounting portion 81 is supported by a bolt 96 on the front end support portion 32 of the front side frame 15. The rear attachment portion 82 is supported by the bolt 97 on the rear end support portion 33 of the connecting member 16. The gear box 47 is fastened to the third support portion 84 with bolts 99.

6, ribs 106 are provided in the vehicle width direction to strengthen the input portions 104 and 105 of the suspension device (suspension device, see FIG. 3) and the rod support portion (fastening portion) 67 of the torque rod 22. By forming the rib 107 extending in front of the rib 106 in the vehicle width direction, the longitudinal direction of the vehicle body is strengthened.
Further, the sliding-shaped rib 102 can be reinforced by forming one of the sliding-shaped ribs (a plurality of ribs described later, see FIG. 7) 102 and the rib 107 extending forward in a straight line in the vehicle longitudinal direction. it can.
In the subframe 20, one of the sliding-shaped ribs 102 and the rib 107 extending forward are formed in a straight line in the vehicle front-rear direction, but the present invention is not limited to this, and a plurality of sliding-shaped ribs are formed. A plurality of ribs extending forward may be formed, and each of the sliding-shaped rib and the rib extending forward may be formed in a straight line.
As shown in FIGS. 7 to 10, the edge portion 68 is a portion having a width in the vehicle front-rear direction. Specifically, it includes a space portion 101 that extends in the vehicle width direction and opens obliquely forward, and a plurality of ribs 102 that divide the space portion 101 into a plurality of portions along the vehicle width direction. The plurality of ribs 102 have inclined portions 103 that are inclined downward from the front end 68a of the edge portion 68 toward the rear end 68b.

  As shown in FIG. 11A, the edge portion 68 of the subframe 20 has an inclined portion (rib inclined portion) 103 inclined downward from the front end 68a of the edge portion 68 toward the rear end 68b. The inclined portion 103 approaches the curb S1 when the vehicle 10 travels as indicated by the arrow a1.

  As shown in FIG. 11B, when the vehicle 10 further proceeds as indicated by an arrow a2, and the inclined portion 103 of the edge 68 abuts against the curb S1, the subframe 20 is moved by the inclined portion 103 as indicated by the arrow a3. Can be moved upward. Thereby, the sub-frame 20 can get over the curb S1. That is, since the plurality of ribs 102 have a function of lifting the subframe 20 as the vehicle moves forward, it can be said that the ribs are sliding-shaped ribs.

  As shown in FIGS. 2, 3, 7, and 9, the subframe 20 supports the suspension device 18 for the front wheel 24 and is attached to the left and right front side frames 15 that extend in the vehicle longitudinal direction. Since the edge portion 68 of the cross member 61 of the subframe 20 has the inclined portion 103 inclined downward from the front end 68a to the rear end 68b of the edge portion 68, the front lower end of the subframe 20 is not used. Can be constructed.

  Accordingly, the subframe 20 is formed of aluminum alloy die-cast product and extruding material such as an extruding material in combination, and the subframe 20 having a small impact when the vehicle is run on a curb or the like while the vehicle is running is made of aluminum. It can be integrally formed with the cast product. As a result, the number of parts can be reduced and the weight of the vehicle body 11 can be reduced as compared with the case where the vehicle subframe is formed with the combined structure. Moreover, since it is an integral molding, the component accuracy can be improved as compared with the case of combining by welding.

  Note that wrought products are a general term for products such as plates, strips, pipes, bars, wires and the like made by hot or cold plastic working such as rolling, extruding, drawing, and forging.

  The edge portion 68 is a portion having a width in the vehicle front-rear direction. The edge portion 68 includes a space portion 101 that extends in the vehicle width direction and opens obliquely forward, and a plurality of ribs 102 that divide the space portion 101 into a plurality of portions in the vehicle width direction. The inclined portion 103 includes a plurality of ribs 102. Therefore, the edge portion 68 that is the riding structure of the subframe 20 can be easily configured. Further, since the space portion 101 is provided at the edge portion 68 and the space portion 101 is partitioned by the plurality of ribs 102, the weight of the vehicle body 11 can be reduced.

  12 to 14 show a subframe (vehicle subframe) 120 according to the second embodiment. The subframe 120 includes a cross member (front horizontal member portion) 121 extending in the vehicle width direction, a cross member (rear horizontal member portion) 122 extending in the vehicle width direction, and left and right vertical members (left and right vertical members) extending in the vehicle front-rear direction. Member portions) 123 and 124, and a center surface portion 125 surrounded by the cross member 121, the cross member 122, and the left and right vertical members 123 and 124.

  The subframe 120 is an aluminum cast vehicle subframe in which cross members 121 and 122, left and right vertical members 123 and 124, and a central surface portion 125 are integrally formed.

  An edge (front edge) 128 extending in the vehicle width direction is formed at the front end of the cross member 121. The edge 128 is formed in a convex shape with the center toward the front of the vehicle. The cross member 122 has an arcuate rear edge 129 at the rear end in plan view. The subframe 120 differs in the shape of the edge (front edge) 128 compared to the subframe (vehicle subframe) 20 (see FIG. 6) of the first embodiment. Other portions are members having substantially the same configuration.

  The edge portion 128 is a portion having a width in the vehicle front-rear direction. Specifically, it has a space 131 that extends in the vehicle width direction and opens obliquely forward, and a plurality of ribs 132 that divide the space 131 into a plurality along the vehicle width direction. The plurality of ribs 132 have inclined portions 133 that are inclined downward from the front end 128a of the edge portion 128 toward the rear end 128b.

  Further, the sub-frame 120 is different from the sub-frame (vehicle sub-frame) 20 of the first embodiment (see FIG. 6) in the shape of the inclined portion 133 of the edge (front edge) 128. The inclined portion 133 is formed to curve in a convex shape toward the front of the vehicle. That is, the inclined portion 133 can also be called a curved portion.

In the sub-frame 120 of the second embodiment, the edge 128 is formed in a convex shape with the center facing the front of the vehicle, so the edge 128 rides on the curb S2 from the center of the sub-frame 120. Thereby, it is considered that the impact applied to the subframe 120 is small, and the durability of the subframe 120 can be improved.
In the subframe 120, the ribs 137 and 138 extending in the vehicle rearward direction are formed at the central portion of the edge portion 128, so that the strength and rigidity of the central portion of the subframe 120 can be improved.

  Further, when the plurality of ribs 132 come into contact with the curb S2, the ribs 132 are scraped by the curb S2. Therefore, in the subframe 120 of the second embodiment, since the inclined portion (curved portion) 133 is formed to be curved in a convex shape toward the front of the vehicle, the function of lifting the subframe 120 as it moves forward of the vehicle. The sliding-shaped rib 132 having the length can be made long-lasting.

The vehicle subframe according to the present invention is a front subframe as shown in FIG. 2, but is not limited thereto, and may be a rear subframe.
Further, the vehicle sub-frame includes a rear beam type shown in the first and second embodiments and a cross beam type shown in the prior art (refer to Japanese Patent Laid-Open No. 2007-186120 or Japanese Patent Laid-Open No. 2005-289126). In addition, in the vehicle subframes 20 and 120 according to the present invention, the sliding-shaped ribs 102 and 132 of the front edges 68 and 128 of the cross members 61 and 121 are provided. In the illustrated cross beam type vehicle subframe, a sliding rib may be provided on the front edge of the front cross member.
Furthermore, although the sub-frame for vehicles was shown in Examples 1 and 2, it does not preclude combining these examples as appropriate.

  As shown in FIGS. 7 and 13, the vehicle subframe according to the present invention has a plurality of ribs 102 and 132, but the number of ribs 102 and 132 is arbitrary.

  In the vehicle subframe according to the present invention, as shown in FIGS. 12 to 14, the edge 128 is formed in a convex shape with the center toward the front of the vehicle, but the present invention is not limited to this, and the edge is the center. May be formed in a concave shape toward the front of the vehicle.

  Also in this case, it is considered that the impact applied to the subframe when the subframe abuts against the curbstone or the like is small, like the subframe 120 formed so that the center of the edge portion 128 is convex toward the front of the vehicle. The durability of the subframe can be improved.

As shown in FIGS. 12 to 14, in the vehicle subframe according to the present invention, the inclined portion (curved portion) 133 is formed to be curved in a convex shape toward the front of the vehicle. It is possible to reliably hit against an object and to make it easier to get over an obstacle.
Further, in the vehicle subframe according to the present invention, the inclined portion (curved portion) 133 is formed to be convexly curved toward the front of the vehicle. However, the present invention is not limited to this, and the inclined portion (curved portion). May be formed to be concavely curved toward the front of the vehicle.

  In this case, generally, since the corner portion of the curb has a curved shape, the inclined portion (curved portion) can be along the curved surface of the curb, and the impact on the subframe can be reduced. .

  The vehicle subframe according to the present invention is suitable for use in passenger cars such as sedans and wagons.

  DESCRIPTION OF SYMBOLS 10 ... Vehicle, 15 ... Left and right front side frame (left and right side frame), 18 ... Suspension device, 20 ... Subframe (vehicle subframe), 24 ... Front wheel, 61 ... Cross member, 68 ... Edge (front edge) ), 101 ... space, 102 ... a plurality of ribs (sliding shaped ribs), 103 ... inclined portions.

Claims (1)

In the vehicle sub-frame that supports the suspension device for the front wheels and is attached to the left and right side frames extending in the vehicle longitudinal direction,
The front edge of the cross member of the sub-frame for the vehicle, have a sloped portion inclined downwardly toward the rear from the front end of the front edge,
The leading edge is
A portion having a width in the vehicle front-rear direction, having a space portion extending in the vehicle width direction and opening obliquely forward, and a plurality of ribs dividing the space portion into a plurality in the vehicle width direction;
The inclined portion is formed in the plurality of ribs .

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