JPH0414305Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an engine mount frame structure for an automobile, and particularly to a reinforcing structure thereof.

(Prior art) Front mount brackets and rear mount brackets that support the engine and transmission in the front and rear positions are attached to the lower part of the engine room of an automobile, as disclosed in, for example, Japanese Utility Model Application No. 113220/1983. A center mount frame is provided as an engine support member for the engine. This center mount frame is provided to extend in the longitudinal direction of the vehicle, and is generally connected at its front end to a front cross member and at its rear end to a darts lower cross member. It is often difficult to secure sufficient space for the center mount frame due to the arrangement of the center mount frame and other equipment and members. For this reason, the cross-sectional shape of the center mount frame is made open upward to avoid interference with the transmission, etc. located above the mount frame, or the middle part of the center mount frame is made diagonally left and right. The front end and the rear end are offset to the left and right by bending the front end and the rear end to secure seats for attaching the front and rear mount brackets, thereby creating a layout in the engine room. is planned.

(Problem to be solved by the invention) However, in the case of an engine mount frame structure using a center mount frame formed with an open cross section and bent left and right like the above center mount frame, the center mount Since the frame has an open cross-section, the rigidity is reduced, and since the center mount frame is bent left and right, when a torsional moment is applied, it tends to bend at the bent part, and furthermore, it is transmitted through the front and rear mount frame brackets. The center mount frame resonates due to the vibrations caused by the engine rotation, causing a problem such as a squealing sound.

The present invention was developed in view of these circumstances, and is a highly rigid center mount frame that can effectively utilize the space in the engine compartment and suppress bending and resonance noise. The aim is to provide an engine mount frame structure with

(Means for Solving the Problems) The automobile engine mount frame structure according to the present invention has a reinforcing plate provided at the bent portion of the center mount frame to create a partially closed cross section to improve rigidity, and the reinforcing plate further includes: The center mount frame is designed to further improve torsional rigidity by forming a bulge extending in a direction substantially perpendicular to the direction in which the center mount frame tends to bend when subjected to a torsional moment. That is, it is provided in the lower part of the engine room, the front end and the rear end are connected to a cross member, and the middle part is diagonally left and right so that the front end and the rear end are offset from left to right. A center mount frame that is bent and has an open cross section that opens upward, and a portion of the center mount frame that is bent obliquely to the left and right to form a closed cross section with the center mount frame. and a reinforcing plate provided therein, wherein the reinforcing plate is formed with a bulge extending obliquely in the front-rear direction at an angle larger than the bending angle of the center mount frame. It is.

The above-mentioned "bulging part" may be composed of one or more beads, or may have a roof-like shape as a whole, and its cross-sectional shape may be an arcuate shape, a curved shape, etc. The shape is not limited to a specific shape such as a letter shape or a trapezoid shape, but any shape may be used as long as it can improve the torsional rigidity of the center mount frame.

In addition, the "bulging part" is defined as a part that extends in a direction substantially perpendicular to the direction in which the center mount frame is bent when subjected to a torsional moment, that is, a part that extends at an angle greater than the bending angle of the center mount frame. As long as it extends obliquely in the front-rear direction, the size of the angle and the length of the bulge are not particularly limited as long as they can provide a reinforcing effect against bending.

The above-mentioned "reinforcement plate" may be provided over the entire portion of the center mount frame that is bent diagonally to the left and right, or may be provided over the entire portion of the center mount frame that is bent diagonally to the left and right, or may be provided on equipment such as a transmission located in the engine room. It may also be partially provided at the bent portion in order to secure space.

(Function) The above configuration improves the rigidity of the center mount frame, thereby suppressing the generation of resonance noise due to vibrations caused by engine rotation, and sufficiently withstanding torsional moments acting on the center mount frame. becomes possible.

(Effect of the invention) Therefore, according to the invention, the space in the engine room can be used effectively, and
It is possible to suppress the center mount frame from generating a squealing sound due to vibrations caused by engine rotation, and to prevent the center mount frame from bending due to torsional moment.

(Example) An example of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a side view showing the engine mount frame structure of an automobile according to this embodiment.

A center mount frame 2 is provided in the lower part of the engine compartment 1 and extends in the longitudinal direction of the vehicle, and the front and rear ends of the center mount frame 2 are connected to a front cross member 3 and a dart lower cross member 4, respectively. Fixed by bolted connections. The center mount frame 2 has an open cross section opening upward, and has engine mount brackets 5 near the front and rear ends.
and 6 are fixed by bolt connection. These engine mount brackets 5 and 6 are
Mounting brackets 9 are fixed by bolts to the front and rear ends of the transmission 8, which is connected to the cylinder block 7 of the engine.
and 10 are each supported via elastic members. The rear half of the lower end of the transmission 8 is inserted into the open cross section of the center mount frame 2.
The reinforcing plate 11 forms a closed cross section with the center mount frame 2 in a portion where the transmission 8 does not enter into the open cross section of the transmission 8, that is, in a portion located below the first half of the lower end of the transmission 8. It is welded to the center mount frame 2 so as to cover the upper part thereof.

FIG. 2 is a plan view showing the center mount frame 2 separately to which the reinforcing plate 11 is welded.

Due to layout constraints within the engine room 1, the center mount frame 2 has a rear end fixed to the dart lower cross member 4 offset to the left with respect to a front end fixed to the front cross member 3. For this reason, the intermediate portions of the front and rear ends are bent diagonally from side to side.
Three beads 12 are formed on the bottom surface of the center mount frame 2 located at this bent portion, and extend at the same angle as the bending angle of the bent portion, thereby reinforcing the center mount frame 2. There is.

The reinforcing plate 11 is provided at the bent part where these beads 12 are arranged, that is, the part where a reinforcing structure is required. It is fixed by spot welding. The reinforcing plate 11 is formed with a bulge 14 that extends obliquely in the front-rear direction at an angle larger than the bending angle of the center mount frame 2, and the apex of the bulge 14 forms a ridge line 15, forming both left and right flanges 13. has reached. As shown in detail in the side view of FIG. 3, on both sides of the ridge line 15, there are a plurality of fold lines 16 corresponding to the left and right flanges 13 being bent vertically.
is formed.

As is clear from Figures 2 and 3, the ridgeline 1
5, and its inclination angle in the left and right direction is determined by the cross section of the center mount frame 2 that is most likely to bend when a torsional moment is applied to the center mount frame 2 (A-A shown in FIG. 2). The size of the ridgeline is determined so that it extends in a direction perpendicular to the cross section along the line.

As described above, in the automobile engine mount frame structure according to this embodiment, due to layout constraints within the engine room 1, the center mount frame 2 to which the engine mount brackets 5 and 6 are attached is formed with an open cross section and bent left and right. Therefore, even in cases where sufficient torsional rigidity cannot be obtained, the reinforcing plate 11 having the bulge 14 formed at an effective angle to improve the torsional rigidity is fixed to the center mount frame. 2
Since the center mount frame 2 is welded to the bent portion of the center mount frame 2, the torsional rigidity of the center mount frame 2 can be greatly improved. Thereby, it is possible to simultaneously obtain the effect of reducing the cage noise generated in the center mount frame 2 due to vibrations caused by engine rotation.

FIG. 4 shows how the cage sound (indicated by a solid line in the figure) generated in the center mount frame 2 provided with the reinforcing plate 11 shown in this embodiment is measured by the reinforcing plate 11.
Center mount frame 2 that is not provided with
and a comparison with the cage noise (indicated by the dashed line and dashed line in the figure) generated in the center mount frame 2 which is provided with a reinforcing plate that has the same planar shape as the reinforcing plate 11 but does not have the bulge 14 formed therein. This is experimental data. As is clear from the figure,
The engine's high speed range (4000~
6000 rpm), the automobile engine mount frame structure according to this example exhibits a remarkable noise reduction effect.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an example of an automobile engine mount frame structure according to the present invention, FIG. 2 is a plan view showing details of the center mount frame and reinforcing plate that constitute the structure, and FIG. The directional view, FIG. 4, is a graph showing the operation of the structure. 1... Engine room, 2... Center mount frame, 3... Front cross member, 4...
Dashboard lower cross member, 11...Reinforcement plate, 14...Bulge, 15...Ridge line.

Claims (1)

[Claims for Utility Model Registration] It is provided in the lower part of the engine room, and has a front end and a rear end connected to a cross member, respectively, and is arranged in the middle so that the front end and the rear end are offset from side to side. a center mount frame having an open cross-section opening upward, the portions of which are bent diagonally left and right; and a reinforcing plate provided to form a cross section, the reinforcing plate having a bulge extending obliquely in the front-rear direction at an angle larger than the bending angle of the center mount frame. An automobile engine mount frame structure characterized by: