JPH02373Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The disclosed technology belongs to the field of front underbody structure technology for automobiles in which a subframe that supports the engine, suspension, steering, etc. is attached to the lower part of the vehicle.

Therefore, in this invention, a subframe with a flat top surface is installed between a pair of front side members running in the longitudinal direction of the vehicle, and a center member on which the engine is mounted is connected to the top surface of the subframe and the front cross. This invention relates to a T-bar type automobile front underbody structure in which the upper surface of the member is locked and the lower surface thereof is on the same level as the lower surface of the subframe. An invention related to the front underbody structure of an automobile, which is formed in a shape that connects the front side members of the vehicle in a straight line, and in which the exhaust pipe, propeller shaft, etc. that run in the longitudinal direction of the vehicle are arranged above the subframe. It is.

<Prior art> In general, various structures are used for the parts that make up the front body of an automobile, depending on differences in engine mounting position, drive system, suspension, steering system, engine support method, etc. It is designed according to the requirements.

Among these, in recent years, for front underbodies, front-engine, front-drive vehicles ( (hereinafter referred to as FF vehicles), etc.

Furthermore, among these modes, a mode is generally referred to as the T-bar system, in which a beam-shaped subframe is installed on the front side members on both sides of the vehicle, and a center member is installed between the subframe and the front cross member. However, in this T-bar system, suspension parts such as the lower arm are supported at both ends of the subframe, and the engine is fixed to the upper part of the center member via anti-vibration rubber, etc., so that the engine is connected to the engine. For exhaust pipes, propeller shafts, etc., the above-mentioned subframe is bent and formed to form a tunnel portion on the lower surface thereof, and the tunnel portion is disposed so as to run in the direction of travel.

<Problem to be solved by the invention> However, the conventional front underbody described above has a large bent part (tunnel part) in the center of the subframe for running the exhaust pipe and propeller shaft, so the subframe itself There was a drawback in terms of car body strength, such as insufficient rigidity.

Additionally, when a bent part is formed in the subframe, a concave part is formed on the bottom surface of the subframe, and a protrusion is formed on the top surface of the subframe, so there is also the problem that the protrusion on the top surface of the subframe narrows the space in the engine room. Ta.

The purpose of this invention was to solve the problems of the front underbody structure of automobiles based on the above-mentioned conventional technology as a technical problem, and to improve the safety of the vehicle by making the subframe a simple structure with excellent rigidity and no waste. It is an object of the present invention to provide an excellent front underbody structure for an automobile that is beneficial to the technical field of member utilization in the automobile industry by improving the efficiency and effectively utilizing the space within the engine room.

<Means for solving the problem> In order to solve the above-mentioned problem, the structure of this invention, which is based on the scope of the above-mentioned utility model registration claim, is based on the above-mentioned purpose. A front underbody structure of an automobile in which a planar subframe is interposed and supported, and a center member on which an engine is mounted is locked to the subframe and a front cross member, wherein the subframe is attached to the front of both sides of the vehicle. In an automobile front body structure formed in a shape that connects the side members in a substantially straight line, the center member is installed between the front cross member and the upper surface of the subframe, and its lower surface is at the same level as the lower surface of the subframe. This is the front underbody structure of a car.

<Function> Thus, a beam-shaped sub-frame formed in a shape that connects the front side members in a substantially straight line is constructed between a pair of front side members running in the longitudinal direction of the vehicle, thereby increasing strength and rigidity. If the center member is fixed to the subframe and front cross member and the engine is installed on the center member, the exhaust pipe and propeller shaft that extend from the engine to the rear of the vehicle will A technical measure has been taken in which the subframe is disposed above the subframe.

<Example> Next, an example of this invention will be described below based on FIGS. 1 to 3.

Reference numeral 1 denotes a front underbody which forms the center of the gist of this invention, and this embodiment shows an aspect of a front-wheel drive vehicle.
A subframe 3 is interposed between a pair of front side members 2, 2 running on both sides of the vehicle, and the subframe 3
A center member 5 is installed at the center of the so-called T
It's bar style.

The subframe 3 is composed of an upper member 6 and a lower member 7, each having a substantially U-shaped cross section and having a flange joint at the opening, and the upper member 6 and the lower member 7 are spot-welded to each other at their flange joints. , is formed with a box-shaped cross-sectional structure.

Further, as shown in FIG. 1, the sub-frame 3 is formed into a substantially H-shape in plan view, and widened portions at both ends formed in the H-shape are bolted and fixed to the body main body (not shown). It is engaged with the lower arm 8 via the lower arm bracket and supports the lower arms 8, 8.

Furthermore, subframe 3, as shown in FIG.
It is formed into a substantially straight line when viewed from the rear, and the intermediate portion excluding the bolted portions at both ends thereof and the body main body is formed as a completely straight beam portion.

On the other hand, one end of the center member 5 is bolted to the center of the front cross member 4, and the other end is superimposed on the upper surface of the center of the subframe 3 and similarly bolted and fixed.

In addition, center member 5 and front cross member 4
The overlapping portion with the front cross member 4 is bent into a stepped shape, and the lower surface of the center member extending from the front cross member 4 to the subframe 3 is set to be at the same height as the lower surface of the subframe 3.

Further, a predetermined number of engine mounts (not shown) are provided on the upper surface of the center member 5, and an engine (also not shown) is placed and fixed thereon.

And from the engine is the exhaust pipe 9
The exhaust pipe 9 extends from the third
As shown in the figure, the front part of the subframe 3 is connected to a rigid body part 11 via a flexible part 10, and the rigid body part 11 is bent and formed as appropriate, and is connected to the rear end of the center member 5 through a holder 12. Support is fixed,
It is arranged so as to extend toward the rear of the vehicle while maintaining a predetermined distance from the upper surface of the subframe 3.

In the above configuration, various loads such as torsion, bending, compression, and tension are applied to the subframe 3 interposed between the front side members 2 on both sides of the vehicle. It has a box-shaped cross-sectional structure consisting of the upper member 6 and lower member 7, and in addition, it is formed so that it is linear in rear view, so it has high strength and rigidity, and the various loads mentioned above can be reliably handled by its structure. Supported by

In addition, since the subframe 3 has a flat top surface, it expands the space in the engine compartment and enables effective placement of other parts.
It also facilitates the mounting of various parts onto the subframe 3.

Since the center member 5 is fixedly installed on the upper surface of the subframe 3, the load of the engine fixedly installed above is supported over the entire area where the center member 5 and the subframe 3 overlap.

In addition, the center member 5 is set so that its lower surface up to the subframe 3 is at the same height as the lower surface of the subframe 3 and is the minimum ground clearance of the front body, so that the vehicle During running, the inside of the engine room is protected by a T-bar shaped plane formed by joining with the subframe 3.

Furthermore, the flexible part 10 of the exhaust pipe 9 linked to the engine is disposed directly below the center of engine rolling at the front part of the subframe 3, and the flexible part 10 absorbs engine vibrations. The engine vibrations transmitted to the rigid body part 11 linked to the engine 10 are attenuated.

Incidentally, it goes without saying that the embodiment of this invention is not limited to the above-mentioned embodiment, and for example, the target is FF
In addition to cars, it may also be a four-wheel drive vehicle. In this case, as shown in FIG. Various aspects such as arrangement can be adopted.

<Effects of the invention> As described above, according to this invention, the sub-frame of the automobile is basically made into a simple structure with excellent strength and rigidity, and there is no waste, thereby improving the safety of the vehicle and reducing the space inside the engine compartment. This provides an excellent effect of making effective use of space.

In other words, by making the subframe installed between the front side members on both sides of the vehicle a beam-shaped subframe that connects the front side members in a straight line, the span can be minimized, and the rigidity and strength of the subframe itself can be minimized. As a result, the excellent effect of ensuring support for the engine, suspension, and steering can be achieved.

By forming the subframe in a straight line, the number of parts is reduced, and the weight can be reduced accordingly.
It has the advantage of improving fuel efficiency and reducing material costs.

Further, by forming the top surface of the subframe into a flat shape, an excellent effect is achieved in that the space in the engine room above the subframe can be used effectively.

In addition, if the subframe and center member are of the T-bar type and their lower surfaces are flush, there is the effect that the engine room can be protected.

[Brief explanation of drawings]

The drawings are explanatory diagrams of an embodiment of this invention, and FIG. 1 is a plan view of one embodiment, FIG. 2 is a rear view of the same, FIG. 3 is a cross-sectional view of FIG. 1, and FIG. 4 is a different one. FIG. 3 is a rear view of the embodiment. 1...Front underbody, 2...Front side member, 3...Subframe, 4...Front cross member, 5...Center member.

Claims (1)

[Scope of utility model registration request] A front underbody structure of an automobile in which a subframe having a flat upper surface is interposed and supported between front side members on both sides of the vehicle, and a center member on which an engine is mounted is secured to the subframe and a front cross member. In the front body structure of an automobile in which the subframe is formed in a shape that connects front side members on both sides of the vehicle in a substantially straight line, the center member is installed between the front cross member and the upper surface of the subframe, and the center member is installed between the front cross member and the upper surface of the subframe. A front underbody structure for an automobile, characterized in that the lower surface is at the same level as the lower surface of a subframe.