JPH11192976A - Center member structure for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress a center member from projectingly deforming in the vehicle downward direction in a head-on collision by providing an engagement part with a power train between a front and a rear power train mount connected to the center member. SOLUTION: When an external force is acted by a head-on collision, the front end part of a car body frame is crushed and a front mount 103a is completely crushed by an engine. This complete crush moves a center member 102 which is a fitting part of the front mount 103a rearward, and a bolt 110 for an engagement part 108 and the end face of a hole 112 which are untouched are brought in contact so that the engagement force is generated. The installation of the engagement part 108 between the front/rear mounts 103a, 103b of the center member 102 which is easily deformed because of its approximately bow shape can suppress the downward bending deformation of the center member 102. This constitution can also generate the complete crush deformation in an energy absorption part 107 using the inertia force of the power train 101 efficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle center member structure.

[0002]

2. Description of the Related Art A conventional vehicle center member structure is disclosed in, for example, JP-A-8-192640 and JP-A-5-192640.
There was one disclosed in Japanese Patent No. 8756.

[0003]

However, in such a conventional vehicle center member structure, when a load is applied in the front-rear direction of the vehicle at the time of a frontal collision, the substantially arcuate center member 2 protrudes downward in the vehicle. At this time, the load input path is from the body frame 5 to the extension member 6 below the floor. Since the power point and the support point are offset in the vertical direction of the vehicle, a bending moment is generated, and the load on the extension member 6 is increased. There is a problem that the transmission effect is reduced. (See Fig. 10)

The present invention has been made in view of such conventional problems, and suppresses the downward deformation of the center member in the vehicle direction, and causes the center member to act as a load input path to the extension member. This aims to solve the above problem.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an engine, comprising: an engine;
A transaxle that transmits the driving force output from the engine, a center member that supports those powertrains via a mount and has an energy absorbing portion for a load in the vehicle longitudinal direction, and In a vehicle body front structure comprising an end portion and a sub-frame joined to each other, an engaging portion with a power train is provided between a front and rear power train mount joined to the center member, and an energy absorbing portion is provided in front of the engaging portion. Features.

[0006] The invention described in claim 2 is the invention according to claim 1.
Wherein the engaging concave portion of the engaging portion has a shape having a size that does not make contact with the engaging convex portion during normal traveling.

[0007] The invention according to claim 3 provides the invention according to claim 1.
3. The vehicle center member structure according to claim 2, wherein the engaging projections and the engaging recesses of the engaging portions are arranged offset in the vehicle front-rear direction, and the engaging direction is from the front of the vehicle to the rear. And

According to a fourth aspect of the present invention, in the vehicle center member structure according to the first aspect, the engaging portion includes a collision detecting device and an engaging convex portion formed into an engaging concave portion by a signal from the collision detecting device. And an engaging device that projects toward the main body.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vehicle center member structure according to the present invention will be described below in detail with reference to the accompanying drawings. (First Embodiment) FIGS. 1 to 4 are diagrams showing a first embodiment of a vehicle center member structure according to the present invention.

First, the structure will be described. As shown in FIGS. 1 to 3, reference numeral 101 denotes a power train including an engine and a transaxle; 102, a center member extending in the vehicle longitudinal direction; 103, a power train 101 and a center member. Reference numeral 103 denotes a front mount, and reference numeral 103b denotes a rear mount. 104
Reference numeral 107 denotes a subframe joined to a lower portion of the body frame 105, a rear end of the center member 102, and a front end of the extension member 106. Reference numeral 107 denotes an energy absorbing portion provided on the center member 102 and having a plurality of beads extending in the vertical direction of the vehicle. Show. Reference numeral 108 denotes an engagement portion between the power train 101 and the center member 102.
3a, 103b, the energy absorbing portion 10
7 is located behind. The engaging projection is provided on the bracket 10.
9, the bolt 110 and the nut 111, and the engagement recess is formed by a hole 112 provided in the power train 101. The bolt 110 is disposed substantially at the center of the hole 112, and the clearance C between the bolt 110 and the hole 112 is larger than the thickness c of the mount rubber portion.

Next, the operation of the first embodiment will be described with reference to FIGS. When an external force acts due to a frontal collision or the like, the front end of the vehicle body frame 105 is crushed, and the front mount 103a is crushed by the engine. Due to this crushing, the center member 102, which is the mounting portion of the front mount 103a, moves rearward, and the bolt 110 of the engaging portion 108, which has not been in contact, comes into contact with the end face of the hole 112 to generate an engaging force (FIG. b)). By installing the engaging portion 108 between the front and rear mounts 103a and 103b of the center member 102, which is likely to be bent due to its substantially arcuate shape, the downward bending deformation of the center member 102 is suppressed, and the power train 101 It is possible to generate a crushing deformation at the energy absorbing portion 107 using the inertia force efficiently (FIG. 3C).

Also, by suppressing the bending deformation of the center member 102, the input load can be efficiently transmitted to the sub-frame 104 (FIG. 4).

The vibration of the power train 101 generated during normal running does not impair the sound and vibration performance since the bolt 110 does not contact the hole 112 (FIG. 3A).

(Second Embodiment) FIGS. 5 to 7 are views showing a second embodiment of a vehicle center member structure according to the present invention. Although the configuration is the same as that of the first embodiment, the following points are different. The engagement portion 208 includes an engagement protrusion formed of a substantially L-shaped member 213 joined to the center member 202, and an engagement recess formed by a vehicle front-rear direction hole 212 provided in the power train 201. The claw 213a of the substantially L-shaped member 213 is arranged to be offset forward of the hole 212. The size of the hole 212 is larger than the claw 213a, and the hole 212 is disposed so that the approximate center of the hole 212 is located on the center line of the claw 213a.

Therefore, similarly to the first embodiment,
When an external force acts due to a frontal collision or the like, the body frame 10
5 is crushed, and the front mount 103a is crushed by the engine. Due to this crushing, the center member 202, which is the mounting portion of the front mount 103a, moves rearward, the substantially L-shaped member 213 joined to the center member 202 moves rearward, and the pawl 213a is disposed on the power train 201. It engages with the hole 212 to generate an engaging force (FIG. 7B).

(Third Embodiment) FIGS. 8 and 9 show a third embodiment of the vehicle center member structure according to the present invention. Although the configuration is the same as that of the first embodiment, the following points are different. The engagement portion 308 includes an engagement recess formed by a bracket 109 having a hole joined to the center member 102, and a solenoid 314 functioning as an engagement protrusion joined to a lower portion of the power train 101. Solenoid 314 receives a signal from collision detection sensor 315 and causes the engagement portion to protrude.

Therefore, the front collision is detected by the collision detection sensor 3.
When the signal 15 is detected, a signal is sent to the solenoid 314 joined to the power train 101 to cause the engaging projection to project into a hole of the bracket 109 joined to the center member 102 to generate an engaging force.

[0018]

As described in detail above, according to the present invention, the structure of the present invention is achieved by connecting the engine, the transaxle for transmitting the driving force output from the engine, and the power train via the mount. In a vehicle body front structure comprising a center member having an energy absorbing portion for supporting a vehicle longitudinal load and a sub-frame attached to a lower part of a body frame and joined to a rear end of the center member, the front and rear parts joined to the center member Since the vehicle center member structure is characterized in that an engaging portion with the power train is provided between the power train mounts and an energy absorbing portion is disposed in front of the engaging portion, the center member can be moved downward of the vehicle in a frontal collision. Suppress convex deformation,
The effect that the center member can be made to act as a load input path to the extension member can be obtained.

[Brief description of the drawings]

FIG. 1 is a side view showing a configuration of a first embodiment of a vehicle center member structure according to the present invention.

FIG. 2 is an exploded perspective view of the first embodiment.

FIG. 3 is a diagram for explaining an effect of the first embodiment.

FIG. 4 is a diagram for explaining an effect of the first embodiment.

FIG. 5 is a side view showing the configuration of the second embodiment.

FIG. 6 is an exploded perspective view of the second embodiment.

FIG. 7 is a diagram for explaining an effect of the second embodiment.

FIG. 8 is a side view showing the configuration of the third embodiment.

FIG. 9 is an exploded perspective view of the third embodiment.

FIG. 10 is a side view showing a configuration of a conventional vehicle center member structure.

[Explanation of symbols]

 101, 201 Powertrain 102, 202 Center member 103 Mount 103a Front mount 103b Rear mount 104 Subframe 105 Body frame 106 Extension member 107, 207 Energy absorption part 108, 208, 308 Engagement part 109 Bracket 110 Bolt 111 Nut 112, 212 Engagement hole 213 Substantially L-shaped member 213a Claw 314 Solenoid 315 Collision detection sensor

Claims (4)

[Claims] An engine, a transaxle that transmits a driving force output from the engine, a center member having an energy absorbing portion for supporting a power train of the engine via a mount and supporting a load in a vehicle longitudinal direction, and a vehicle body frame In the vehicle body front structure attached to a lower part and comprising a sub-frame joined to the rear end of the center member, an engaging portion with a power train is provided between front and rear power train mounts joined to the center member, and energy is provided in front of the engaging portion. A center member structure for a vehicle, wherein an absorption portion is provided. 2. The center member structure for a vehicle according to claim 1, wherein the engaging concave portion of the engaging portion has a shape having a size that does not contact the engaging convex portion during normal running. Vehicle center member structure. 3. The vehicle center member structure according to claim 1, wherein the engaging projection and the engaging recess of the engaging portion are arranged offset in the vehicle front-rear direction, and the engaging direction is set to the vehicle. A center member structure for a vehicle, wherein the center member is arranged from the front to the rear. 4. The center member structure for a vehicle according to claim 1, wherein the engagement portion includes a collision detection device and an engagement device that projects an engagement protrusion toward the engagement recess by a signal from the collision detection device. A vehicle center member structure characterized by being satisfied.