JP2010167897A - Sub-frame structure for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely receive load of the other vehicle by a sub-frame, and to sufficiently reduce speed of the other vehicle by the sub-frame. <P>SOLUTION: In this sub-frame structure for a vehicle, vehicle parts including driving system parts, steering parts or chassis parts are mounted on a front sub-frame 40, and the front sub-frame 40 is suspended below a vehicle body frame. The front sub-frame 40 is constituted of a front cross member 41 extended linearly in a vehicle width direction of a vehicle body, right and left vertical members 42 and 43 extended to a vehicle body rear side from both ends of the front cross member 41, and a rear cross member 44 for connecting rear ends of the vertical members 42 and 43. The front cross member 41 includes a bent part 46 projected to a rear side in plane view to receive a tire 82 of the other vehicle 81 during a collision. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicular subframe structure that is mounted on a vehicle body side by mounting a drive system component, a steering component, or a suspension component.

Some vehicle subframe structures include a drive system component including a power source, a steering component such as a steering gear box, and a front subframe for supporting suspension components such as a suspension.
As such a vehicle sub-frame structure, a structure in which a front sub-frame is formed in a substantially rectangular shape so that a drive system component, a steering component, or a foot suspension component can be mounted is known (for example, Patent Documents). 1).

  The vehicle subframe structure of Patent Document 1 is a structure of a front subframe that is supported below the body frame. The front subframe includes a front cross member that extends linearly in the vehicle width direction of the vehicle body, left and right vertical members that extend from both ends of the front cross member to the rear of the vehicle body, and a rear end that connects the rear ends of these vertical members. It consists of a cross member.

  However, in the vehicle subframe structure of Patent Document 1, the front cross member of the front subframe is linear (straight shape). Since the front cross member is configured linearly, when the opponent vehicle collides with the own vehicle, the tire of the opponent vehicle slides and moves on the front cross member of the own vehicle. When the tire of the opponent vehicle moves laterally across the front cross member of the own vehicle, a loss occurs in the load transmission to the side sill of the opponent vehicle. That is, there has been a problem that the opponent vehicle cannot be sufficiently decelerated by the front subframe.

JP 2008-195094 A

  It is an object of the present invention to provide a vehicle subframe structure that can reliably receive the load of the opponent vehicle at the front subframe and can efficiently transmit the load to the side sill of the opponent vehicle. It is another object of the present invention to provide a vehicle subframe structure that can simplify the structure around the front subframe.

  According to a first aspect of the present invention, there is provided a vehicle subframe structure in which a vehicle body part including a drive system part, a steering part, or a footrest part is mounted on a front subframe, and the front subframe is suspended below the vehicle body frame. A front cross member whose frame extends linearly in the vehicle width direction of the vehicle body, left and right vertical members extending from both ends of the front cross member to the rear of the vehicle body, and a rear cross member that connects the rear ends of these vertical members The front cross member is provided with a bent portion that protrudes rearward in a plan view and receives the tire of the opponent vehicle in the event of a collision.

  The invention according to claim 2 is characterized in that the bent portion includes a protruding portion that protrudes forward of the vehicle body and holds the tire of the opponent vehicle in a predetermined position at the time of the collision.

  The invention according to claim 3 is characterized in that the protrusion is composed of a first protrusion that supports the radiator of the vehicle part and a second protrusion that supports the front bumper face of the vehicle part. .

The present invention has the following effects.
In the invention according to claim 1, the vehicle body part including the drive system part, the steering part or the suspension part is mounted on the front subframe, and the front subframe is suspended below the body frame.
The front subframe includes a front cross member that extends linearly in the vehicle width direction of the vehicle body, left and right vertical members that extend from both ends of the front cross member to the rear of the vehicle body, and a rear end that connects the rear ends of these vertical members. It consists of a cross member.
Since the front cross member is provided with a bent portion that protrudes rearward in a plan view and receives the tire of the opponent vehicle in the event of a collision, for example, when a frontal collision occurs, the tire of the opponent vehicle is received, Load can be transmitted efficiently to the side sill. On the other hand, the load can be sufficiently transmitted even in the front side frame of the host vehicle. Therefore, it is possible to reduce damage to both the host vehicle and the opponent vehicle.

  In the invention according to claim 2, since the bent portion is provided so as to protrude forward of the vehicle body and hold the tire of the opponent vehicle in a predetermined position at the time of the collision, the protrusion of the opponent vehicle is positioned at the predetermined position. The tire can be held. Thereby, it is not necessary to provide a bent part deeply. As a result, the degree of freedom in designing the front subframe can be improved.

  In the invention according to claim 3, since the projecting portion is composed of the first projecting portion that supports the radiator of the vehicle component and the second projecting portion that supports the front bumper face of the vehicle component, Can support radiators and front bumper faces. That is, the projecting portion can be multi-functional. As a result, the structure around the front subframe can be simplified.

1 is a perspective view of a front portion of a vehicle body that employs a vehicle subframe structure according to the present invention. It is a top view of the subframe structure for vehicles concerning the present invention. It is explanatory drawing which shows the first half of an effect | action of the vehicle sub-frame structure shown by FIG. FIG. 3 is an explanatory view showing the latter half of the operation of the vehicle subframe structure shown in FIG. 2. FIG. 3 is a comparative study diagram of the vehicle subframe structure shown in FIG. 2. FIG. 3 is a comparative study diagram of load transmission of the vehicle subframe structure shown in FIG. 2.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.

  As shown in FIG. 1, the vehicle 10 includes a vehicle body frame 20 configured at the front of the vehicle body, and a front subframe 40 supported by the vehicle body frame 20.

  The vehicle body frame 20 includes left and right front side frames 21 and 21 extending in the front-rear direction of the vehicle body, and left and right upper frames 22 and 22 extending in the vehicle width direction outside of the front side frames 21 and 21 and in the upper direction. The 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, the front portions of the left and right front side frames 21 and 21, and the left and right upper frames 22 and 22. It is comprised from the front bulkhead 24 couple | bonded with the front part.

  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.

  Specifically, the front sub-frame 40 includes front and rear portions on the front portions of the left and right front side frames 21 and 21 and the front end portions of the left and right floor frames 31 and 31 that extend rearward from the rear ends of the front side frames 21 and 21. It is suspended through four vibration-proof elastic bushes 32 on the left and right.

  The front subframe 40 supports a lower end 33a of a radiator 33 for cooling an engine (not shown) and a lower end 34a of a front bumper face 34 that covers a lower portion of the front surface. The radiator 33 and the front bumper face 34 are examples of vehicle parts.

  The radiator 33 is provided with pins 35 and 35 at a lower end 33a. Rubber bushes 36 and 36 are inserted into the pins 35 and 35. The rubber bushes 36, 36 are parts interposed between the lower end 33 a of the radiator 33 and the front subframe 40.

A protruding piece 37 is provided at the lower end 34a of the front bumper face 34 toward the rear of the vehicle body. Supporting holes 38 and 38 for supporting the front subframe 40 are formed in the protruding piece 37.
That is, the vehicle subframe structure is the structure of the front subframe 40. Hereinafter, the front subframe 40 will be described in detail.

  As shown in FIG. 2, the front sub-frame 40 includes a front cross member 41 linearly extending in the vehicle width direction of the vehicle body, and left and right vertical members 42 extending from both ends of the front cross member 41 to the rear of the vehicle body. , 43 and a rear cross member 44 for connecting the rear ends of these vertical members 42, 43.

  The front cross member 41 protrudes rearward in a plan view, and is provided with a bent portion 46 that receives a tire of an opponent vehicle (to be described later) at the time of a collision, and is protruded forward of the vehicle body at the bent portion 46 and supports a radiator 33 of a vehicle body part. First protrusions 47 and 48 and second protrusions 51 and 52 that are provided at the bent part 46 so as to protrude forward of the vehicle body and support the front bumper face 34 of the vehicle body part.

  Fitting holes 47 a and 48 a for fitting the pins 35 and 35 of the radiator 33 are formed in the first protrusions 47 and 48. The fitting hole 47a is a long hole. Mounting holes 51 a and 52 a for attaching the front bumper face 34 are formed in the second protrusions 51 and 52.

  The bent portion 46 includes left and right inclined surfaces 53 and 54 that are inclined toward the rear of the vehicle body toward the center of the vehicle width, and a flat surface 55 that connects these inclined surfaces 53 and 54. Further, the bent portion 46 functions as a holding portion that holds the tire of the opponent vehicle on the flat surface 55 at a predetermined position when the opponent vehicle collides with the own vehicle and the front cross member 41 is bent.

The first protrusions 47 and 48 are formed on the left and right inclined surfaces 53 and 54. The second protrusions 51 and 52 are formed in the flat surface 55.
The first projecting portions 47 and 48 and the second projecting portions 51 and 52 function as stop portions that stop the tires of the opponent vehicle when the opponent vehicle collides with the host vehicle and the front cross member 41 is bent.

  That is, the protrusions 47, 48, 51, 52 are the first protrusions 47, 48 that support the vehicle component radiator 33, and the second protrusions 51, 52 that support the vehicle component front bumper face 34. It can be said that it was composed of As a result, the radiator 33 and the front bumper face 34 can be supported by the protrusions 47, 48, 51, 52. That is, the multi-function of the protrusions 47, 48, 51, 52 can be achieved. As a result, the structure around the front subframe 40 can be simplified.

  The left vertical member 42 includes a front convex portion 61 projecting forward of the front cross member 41, a bow portion 62 bent concavely from the front convex portion 61 toward the vehicle width center, and a rear side of the rear cross member 44. And it consists of the rear convex part 63 projected outside the vehicle width. The bow portion 62 is formed with a concave portion (constriction portion) 64 that allows deformation when the opponent vehicle collides with the host vehicle.

  The right vertical member 43 is a substantially target member with respect to the left vertical member 42 in the vehicle width direction. The right vertical member 43 includes a front convex portion 66 projecting forward of the front cross member 41, a bowed portion 67 bent concavely from the front convex portion 66 toward the vehicle width center, and a rear side of the rear cross member 44. And a rear convex portion 68 that protrudes from the rear surface. The bow portion 67 is formed with a concave portion (neck portion) 69 that allows deformation when the opponent vehicle collides with the host vehicle.

  The rear cross member 44 is formed linearly in the vehicle width direction. Alternatively, it is formed to be slightly curved toward the rear of the vehicle body.

  FIG. 3A shows a state in which the opponent vehicle 81 collides with the own vehicle 10 and the tire 82 of the opponent vehicle 81 has entered as indicated by an arrow a1 until just before the front cross member 41 of the front subframe 40.

  In FIG. 3B, the tire 82 of the opponent vehicle 81 abuts the second protrusion 52 as indicated by an arrow a2 while crushing the first protrusion 48 of the front cross member 41 of the front subframe 40, and the second The protrusion 52 bites into the tire 82 of the opponent vehicle 81.

  In FIG. 4A, when the tire 82 of the opponent vehicle 81 enters the front subframe 40 as indicated by an arrow a3, and the tire 82 of the opponent vehicle 81 is steered to the left as indicated by an arrow a4 due to an impact. However, since the tire 82 of the opponent vehicle 81 bites into the first protrusion 48 and the second protrusion 52, the tire 82 can be prevented from slipping on the front cross member 41 of the front subframe 40.

  In FIG. 4B, when the tire 82 of the opponent vehicle 81 further enters the front sub-frame 40 as indicated by an arrow a5, and the tire 82 of the opponent vehicle 81 is steered to the right as indicated by an arrow a6 due to an impact. In addition, since the tire 82 of the opponent vehicle 81 bites into the first protrusion 48 and the second protrusion 52, it is possible to prevent the front cross member 41 of the front subframe 40 from slipping.

  The bent portion 46 is provided to protrude forward of the vehicle body and includes first protrusions 47 and 48 and second protrusions 51 and 52 that hold the tire 82 of the opponent vehicle 81 at a predetermined position in the event of a collision. . Therefore, the tire 82 of the opponent vehicle 81 can be held at a predetermined position by the first protrusions 47 and 48 and the second protrusions 51 and 52. Thereby, it is not necessary to provide the bent portion 46 deeply. As a result, the degree of freedom in designing the front subframe 40 can be improved.

In the vehicular subframe structure, the left and right vertical members 42 and 43 are formed with bowed portions 62 and 67 bent concavely toward the vehicle width center. The bow portions 62 and 67 include concave portions (neck portions) 64 and 69 that allow deformation when the opponent vehicle 81 collides with the host vehicle 10.
That is, the left and right vertical members 42 and 43 can be deformed by the load transmitted from the front cross member 41. Thereby, the collision load can be absorbed by the front sub-frame 40.

  As shown in FIG. 5 (a), the front subframe 100 of the comparative example has a front cross member 101 that extends linearly in the vehicle width direction of the vehicle body, and extends from both ends of the front cross member 101 to the rear of the vehicle body. The left and right vertical members 102 and 103 and a rear cross member 104 connecting the rear ends of the vertical members 102 and 103 are constituted. The front cross member 101 is formed in a straight line (straight) in the vehicle width direction.

  As shown in FIG. 5B, the front subframe 40 of the embodiment includes a bent portion 46 that receives the tire 82 of the opponent vehicle 81 at the time of a collision in the front cross member 41.

As shown in FIG. 6A, in the front subframe 100 of the comparative example, the front cross member 101 is formed in a straight line (straight) in the vehicle width direction.
The opponent vehicle 111 enters. The tire 112 of the opponent vehicle 111 collides with the front cross member 101 of the front subframe 100 as indicated by an arrow b1.

  In this case, the tire 112 of the opponent vehicle 111 slips on the front cross member 101 and the tire 112 of the opponent vehicle 111 slides sideways on the front cross member 101 of the host vehicle 110 as indicated by the arrow b2. When skidding, a transmission loss occurs in the load transmission to the side sill 113 of the opponent vehicle 111 as shown by an arrow b3. In other words, the opponent vehicle 111 cannot be sufficiently decelerated by the front subframe 100.

  As shown in FIG. 6B, the front sub-frame 40 of the embodiment is provided with a bent portion 46 that receives the tire 82 of the opponent vehicle 81 in the event of a collision. The partner vehicle 81 collides with the host vehicle 10, and the tire 82 of the partner vehicle 81 collides with the front cross member 41 as shown by an arrow b4. In this case, the bent portion 46 functions as a holding portion that holds the tire 82 of the opponent vehicle 81 in a predetermined position. Therefore, the tire 82 of the opponent vehicle 81 can be held at a predetermined position of the bent portion 46.

As shown in FIGS. 1 to 6, in the vehicle subframe structure, a vehicle body part including a drive system part, a steering part or a suspension part is mounted on the front subframe 40, and the front subframe is disposed below the body frame. 40 was hung.
The front sub-frame 40 includes a front cross member 41 linearly extending in the vehicle width direction of the vehicle body, left and right vertical members 42 and 43 extending from both ends of the front cross member 41 to the rear of the vehicle body, and the vertical members 42. , 43 and a rear cross member 44 for connecting the rear ends.

  The front cross member 41 is provided with a bent portion 46 that protrudes rearward in a plan view and receives the tire 82 of the opponent vehicle 81 in the event of a collision. For example, when a frontal collision occurs, the tire 82 of the opponent vehicle 81 can be received and the load can be efficiently transmitted to the side sill 83 of the opponent vehicle 81. On the other hand, the load can be sufficiently transmitted even in the front subframe 40 of the host vehicle 10. Accordingly, it is possible to reduce damage to both the own vehicle 10 and the opponent vehicle 81.

  In the vehicle subframe structure according to the present invention, as shown in FIG. 1, the radiator 33 is supported by the first protrusions 47 and 48. However, the present invention is not limited to this. May be used.

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

  DESCRIPTION OF SYMBOLS 10 ... Vehicle, 20 ... Body frame, 40 ... Front sub-frame, 41 ... Front cross member, 42, 43 ... Left and right vertical member, 44 ... Rear cross member, 46 ... Bending part, 47, 48 ... First protrusion part , 51, 52 ... second protrusions.

Claims (3)

In the vehicle subframe structure in which vehicle parts including drive system parts, steering parts or suspension parts are mounted on the front subframe, and the front subframe is suspended below the body frame,
The front sub-frame connects a front cross member linearly extending in the vehicle width direction of the vehicle body, left and right vertical members extending from both ends of the front cross member to the rear of the vehicle body, and the rear ends of these vertical members. After the cross member,
The vehicle subframe structure, wherein the front cross member includes a bent portion that protrudes rearward in a plan view and receives a tire of an opponent vehicle in the event of a collision.   2. The vehicle subframe structure according to claim 1, wherein the bent portion includes a protruding portion that protrudes forward of the vehicle body and holds a tire of the opponent vehicle at a predetermined position in the event of a collision.   The said protrusion part was comprised from the 1st protrusion part which supports the radiator of the said vehicle component, and the 2nd protrusion part which supports the front bumper face of the said vehicle part, The Claim 1 characterized by the above-mentioned. Sub-frame structure for vehicles.

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