JPH06255534A - Front body structure of vehicle - Google Patents

Abstract

PURPOSE:To adjust the fitting position of an add-on frame so as to reduce the offset of an engine mounting member and to enlarge a span between fitting points by supporting an engine by body frames and the fitting part of the add-on frame. CONSTITUTION:A frame 3, the front structural member of a body, is constituted of a body frame formed of both upper and lower side frames 31, 32 welded to the inside face of a wheel apron 1, and an add-on frame 33 fitted to the upper face of the body frame. The inside face of the add-on frame 33 is provided with a fitting part 33a formed in the state of overhanging inward of an engine room. An engine 4 is lifted from below to be inserted into the engine room, and an engine mounting member 5 is fastened to the lower faces of the body frames 31, 32 by pre-fastening fitting bolts 6. The add-on frame 33 is then fitted onto the body frames 31, 32, and the engine mounting member 5 is fastened to the fitting part 33a by a post-fastening fitting bolt 7.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Generally, as shown in FIG. 3, a frame b having a substantially U-shaped cross section is welded and fixed to an inner side surface of a wheel apron a constituting a side wall of an engine room.
This forms a skeleton in the front-rear direction, the left and right bumper stays of the front bumper are inserted and fixed to the front end portions of the left and right frames b, and the left and right front portions of the engine c are mounted on the left and right frames b. It is normal that Conventionally, the frame b is generally configured as an integrated dedicated structure (for example, the actual flat panel 3-55).
No. 381).

[0003]

Generally, in mounting an engine in an engine room, the engine is usually lifted from the lower side of the engine room and the engine mount member d is bolted to the frame b to be mounted. The engine mount tightening structure that is automated in the engine mounting process is inevitably a structure in which the engine mount member d is tightened to the lower surface of the frame b from below, but in the above conventional engine room side wall structure, the side end of the engine c is Since a predetermined gap δ for lifting and inserting the engine c is necessary between the frame b and the inner end surface of the frame b, the engine weight load acting point of the engine mount member d and the frame b
The offset from the mounting part to the
There is a problem that the span s between the mounting portions of the two bolts on the lower surface cannot be made large, and it is difficult to secure the engine support strength.

The present invention aims to address the above-mentioned conventional problems.

[0005]

According to the present invention, a frame of a front vehicle body comprises a vehicle body frame welded and fixed to the inside of a wheel apron, and an add-on frame stacked and fixed on the vehicle body frame. A mounting portion for mounting an engine mount member is provided on the inner surface of the add-on frame by overhanging in the engine room, and the engine is lifted and inserted into the engine room from below in a state where the add-on frame is not mounted on the vehicle body frame. Then attach the engine mount member to the lower surface of the vehicle body frame from the bottom with the first tightening mounting bolt, then stack the add-on frame on the vehicle body frame and fix it, and then tighten the engine mount member from the bottom to the above mounting part of the add-on frame. By tightening the mounting bolts and mounting the engine to the body frame It is characterized in that it has to be supported by the mounting portion of the de-on frame.

[0006]

With the above-described structure, the engine mount member can be attached to the add-on frame at a position below the end on the engine side inside the body frame or at a position overlapping with the engine. It is possible to reduce the offset between the engine heavy load acting point and the mounting point on the frame, and to increase the span between the mounting point by the pre-tightening mounting bolt and the mounting point by the inner post-tightening mounting bolt. can do.

[0007]

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

In FIG. 1, reference numeral 1 denotes a wheel apron, and a suspension tower 2 for mounting a front suspension is formed at a required portion of the wheel apron 1.

Reference numeral 3 denotes a frame. The frame 3 has an upper frame 31 whose rear end is fixed to a cross member formed on the front surface of the dash panel and whose front end is near the front of the suspension tower 2, and whose rear part is upper. A lower frame 32 which is fixedly joined to the lower surface of the frame 31 and whose front portion extends to the front end of the vehicle body and whose front end is fixed to the radiator lower frame 11.
And an add-on frame 33 that extends from the front end of the upper frame 31 onto the upper surface of the lower frame 32 and extends forward. The upper frame 31 and the lower frame 32 are inside the lower edge of the wheel apron 1. The add-on frame 33 is assembled to the vehicle body frame after the engine is mounted in the outfitting process, as will be described later, by being joined and fixed by welding substantially along the above.

The add-on frame 33 has a box-shaped cross section having a substantially quadrangular cross section, and an attachment portion 33a of the engine mount member 5 is formed on the inner side surface thereof so as to project inward. The mounting portion 33a may be formed integrally with the add-on frame 33, or the mounting portion 33a may be configured as a separate member and welded and fixed to the inner surface of the add-on frame 33.

The front end portion of the add-on frame 33 penetrates the radiator panel side and extends straight forward to the vicinity of the back beam of the front bumper, and the back beam is attached to the add-on frame 33 via a bumper attachment bracket. At the time of a collision, the collision load is directly input to the add-on frame 33 via the back beam of the front bumper and the bumper mounting bracket.

The process of mounting the engine 4 having the above structure will be described below with reference to FIG.

When the engine 4 is inserted upward from the lower side of the engine room, the add-on frame 33 is not yet attached as shown in FIG.
Left and right ends (in the case of a horizontally opposed engine, the belt cover end of the timing belt) and the left and right lower frames 32
A necessary gap δ is formed between the inner surface of the engine 4 and
Is an engine mount member 5 attached to the engine body
The mounting base 5a is lifted up to a position where it joins the lower surface of the lower frame 32, and the mounting bolt 6 which is tightened from the lower side is screwed and tightened to temporarily mount the engine 4 as shown in FIG. 2B. .

Next, the add-on frame 33 is mounted on the lower frame 32 by fitting the rear end of the add-on frame 33 into the fitting portion 31a formed at the front end of the upper frame 31. For example, adhesion with structural adhesive and bolts. It is fixed to the front end of the upper frame 31 and the upper surface of the lower frame 32 by means such as tightening by 8. In this way, with the add-on frame 33 attached and fixed to the upper frame 31 and the lower frame 32, the attachment portion 3 provided on the inner side surface portion of the add-on frame 33
As shown in FIG. 1 (B), 3a overhangs from the inner surface of the lower frame 32 toward the inside of the engine room, and is placed on the upper surface of the engine mount member 5 in a state of entering under the left and right end portions of the engine 4. To join. And this mounting part 3
By tightening the joint portion between 3a and the engine mount member 5 with the post-tightening mounting bolt 7, the engine 4
Is completed. 6a, 7a, 8a are welding nuts.

In the engine mounted state, the mounting portion by the rear tightening bolt 7 is located inside the clearance δ required for lifting and inserting the engine, that is, at the lower side end of the engine 4 or the lower inside thereof, and the engine mount member is provided. The offset between the engine heavy load acting point of No. 5 and the mounting portion to the frame 3 can be made smaller than the conventional one, and the span between the two mounting bolts 6 and 7 for the front tightening and the rear tightening can be reduced. The size of the engine can be made much larger, and the desired engine support can be performed in the engine room with higher integration.

In FIG. 1, reference numeral 2a is a suspension tower bracket welded and fixed to the suspension tower 2, and the upper frame 31 and the lower frame 32 are fixed to the suspension tower bracket 2a by bolts 9 together.
Alternatively, the battery base 10a for mounting the battery 10 may be fixed together by the bolts 8 that fix the lower frame 32 and the add-on frame 33 that overlaps the upper surface thereof.

[0017]

As described above, according to the present invention, the frame, which is the side wall structural member of the engine room, is welded and fixed to the inner side of the wheel apron, and the add-on is joined and fixed to the upper surface of the body frame. The add-on frame is provided with a mounting part for mounting the engine mount member protruding inside the engine room, and the engine is inserted upward from below into the engine room without the add-on frame. Then, screw the engine mount member onto the lower surface of the vehicle body frame from the lower side with a pre-tightening mounting bolt and tighten it, then jointly fix the add-on frame on the vehicle body frame, and attach the engine mount member to the mounting portion provided on the add-on frame. Attach the engine mount member by tightening it from the bottom with the post-tightening mounting bolt. Due to the structure that causes injury, the mounting part by the rear tightening mounting bolt can overhang in the engine room and be located near the engine weight load acting point, and the mounting part by the first tightening mounting bolt and the rear tightening mounting bolt can be performed. It is possible to take a large span between the mounting part and the mounting part, and it becomes possible to support the engine at the intended position during the automatic engine mounting process, and it is possible to bring great effects in practical use.

[Brief description of drawings]

1 shows an embodiment of the present invention, (A) is a perspective view showing an example of a framework of one side wall of a front vehicle body, (B) is a sectional view taken along line BB of (A). The engine mounted state is shown, (C) is CC sectional drawing of (A).

2A and 2B are cross-sectional views sequentially showing an engine mounting process according to the present invention. FIG. 2A is a state in which an engine is lifted and inserted into an engine room, and FIG. And temporarily attached.

3A and 3B show an example of a conventional structure, FIG. 3A is a perspective view showing a framework of one side wall of a front vehicle body, and FIG. 3B is a sectional view showing an engine mounted state.

[Explanation of symbols]

 1 Wheel Apron 2 Suspension Tower 3 Frame 4 Engine 5 Engine Mount Member 5a Mounting Base 6 Pre-Tightening Mounting Bolt 7 Post-Tightening Mounting Bolt 31 Upper Frame 31a Fitting Part 32 Lower Frame 33 Add-on Frame 33a Mounting Part

Claims (3)

[Claims] 1. A frame, which is a side wall structural member of an engine room, is constituted by a body frame welded and fixed to the inside of a wheel apron and an add-on frame stacked and fixed on the body frame. The engine mount member mounting part is provided on the inner surface of the engine by overhanging inward of the engine room.With the add-on frame not mounted on the vehicle body frame, lift the engine into the engine room from below and insert the engine mount member into the vehicle body. After tightening and fixing to the underside of the frame with the pre-tightening mounting bolts, mount and fix the add-on frame on the vehicle body frame, and tighten and fix the engine mount member to the above-mentioned mounting part provided on the add-on frame with the post-tightening mounting bolts. A front body structure of a vehicle characterized by being configured. 2. The front body structure for a vehicle according to claim 1, wherein the body frame includes an upper frame welded and fixed to an inner surface of the wheel apron behind a suspension tower formed on the wheel apron, and a rear portion of the upper frame. The add-on frame is fixed to the lower surface of the upper frame and includes a lower frame extending to the front end of the vehicle body.The add-on frame has a rear end extending straight from the front end of the upper frame to the front of the lower frame. A front body structure of a vehicle, which is fixedly stacked on an upper surface of a part. 3. The front body structure for a vehicle according to claim 2, wherein the add-on frame is adhesively fixed to the front end of the upper frame and the upper surface of the lower frame with a structural adhesive or a structural adhesive. A front body structure of a vehicle, which is characterized by being fixed by bolting after being adhered by.