JP2002274197A - Engine mount bracket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an engine mount bracket having a structure allowing increasing yield of bracket materials and improving rigidity and stress concentration. SOLUTION: This bracket comprises two wall plates (side plats 2, 3) arranged oppositely to each other and a cover plate (upper plate 4) connecting one edge part α of each wall plate with each other. The wall plates and the cover plate are connected by welding W.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine mount bracket for supporting an engine on a vehicle body frame.

[0002]

2. Description of the Related Art Conventionally, an automobile engine is supported on a body frame (not shown) via an engine mount bracket 50 and an engine mount 51 as shown in FIG. Conventional engine mount bracket 50
Is formed from a sheet metal press-formed product (integrally formed product by bending), and connects two side plate portions 50a, 50b arranged in parallel to each other and one side (upper side) of these side plate portions 50a, 50b. It is configured as a component having a U-shaped cross section and having the upper plate portion 50c. Also,
Of the side plates 50a and 50b, bolt insertion holes 52 are respectively formed at one end portions protruding from the upper plate portion 50c in plan view, and these portions serve as engine mount suspension portions 53. Thus, the engine mount bracket 5
The upper plate 50c is fastened and fixed to a vehicle body frame (not shown) by bolting or the like, whereby the engine mount bracket 50 is attached to the vehicle body frame in a hanging state.

On the other hand, the above-described engine mount 51 has a cylindrical bush 55 in which a vibration damping rubber 54 is fitted.
One end is constituted by a mounting bracket 56 integrally connected to the cylindrical bush 55. The other end (tip) 56a of the mounting bracket 55 of the engine mount 51 is bolted to an engine (not shown).

[0004] Thus, the engine mount bracket 5
The cylindrical bush 54 of the engine mount 51 is inserted and arranged between the one end portions of the side plates 50a and 50b of the "0", and the bolt 57 is inserted through the bolt insertion hole 52 of the engine mount bracket 50 and the central portion of the cylindrical bush 54. The engine mount 51 is assembled to the engine mount bracket 50 by being inserted into the holes 58 and fastened to the nuts 59, and the engine is mounted on the engine mount 5.
1, and is supported (suspended) on the vehicle body frame via the engine mount bracket 50.

[0005]

However, in the conventional engine mount bracket 50 as described above, since it is an integrally molded product (press molded product) manufactured by bending one sheet metal, the engine mount bracket is required. There is a problem in that the yield of the bracket material is poor in the production of 50. That is, if the size and shape of the engine mount bracket 50 are large or have a special shape, the proportion of the space (area) that is cut and deleted from one sheet metal material and is not used as a part increases. Actually, the ratio of the portion of the sheet metal material that can be effectively used as the engine mount bracket 50 is reduced, and the sheet metal material cannot be effectively used.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to improve the yield of bracket materials and to improve rigidity and stress concentration. It is to provide an engine mount bracket having a structure.

[0007]

In order to achieve the above object, according to the present invention, an engine mount bracket for supporting an engine on a vehicle body frame includes two wall plates disposed opposite to each other, A cover plate is provided for connecting one side of each of the wall plates to each other, and the two wall plates and the cover plate are joined by welding. Further, in the present invention, a connecting plate is bridged between the other side portions of the two wall plates, which are opposite to one side portion of the two wall plates, which are connected via the cover plate, and are joined by welding to form the two wall plates. A plate, the cover plate, and the connecting plate form a closed cross-sectional shape portion. Also,
In the present invention, one side portion and the other side portion of the two wall plates are bent with respect to the base portion of the wall plate, and at least the side portion of the one side portion to which the cover plate is welded with respect to the base portion. To make a plane that forms a substantially right angle. Further, according to the present invention, an edge portion of the cover plate on the engine mount mounting side and not in contact with one side of the wall plate in a region arranged between the two wall plates. Is provided with a notch. Further, in the present invention, the wall plate is formed into a shape symmetrical with respect to a central axis in a length direction.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIGS. 1 to 9 show an engine mount bracket 1 according to a first embodiment of the present invention. The engine mount bracket 1 is an automobile part for supporting an engine on a vehicle body frame, and as shown in FIGS. 1 and 2, includes side plates 2 and 3 as two wall plates disposed to face each other. And one upper plate 4 as a cover plate that connects one side (upper side) α of each of the two side plates 2 and 3 to each other. In the present embodiment, the side plates 2, 3 and the upper plate 4 are individually pressed members, and these side plates 2, 3 and the upper plate 4 are connected to each other by welding W (see FIG. 1). Have been.

Each of the two side plates 2 and 3 has a shape symmetrical with respect to the central axis in the longitudinal direction. The two side plates 2 and 3 which are formed in the same shape are arranged in opposite directions. ing. Each side plate 2, 3 is shown in FIGS.
As shown in FIG. 1, the base portion 5 has a flange portion 6 which is bent at substantially right angles to the base portion 5 over the entire periphery of the base portion 5. Therefore, the side plates 2 and 3 are formed in a U-shaped cross section, and are arranged to be symmetrically opposed to each other in a state where the flange portions 6 are directed in opposite directions (outward directions). Further, the side plates 2 and 3 are bent at an intermediate portion in the longitudinal direction, and the interval between the one end portions 2a and 3a is relatively narrowed. Bolt insertion holes 7 are formed in one end portions 2a and 3a of the side plates 2 and 3, respectively.
The engine mount suspension part 8 is constituted by a and 3a.

On the other hand, of the upper surface of the flange portion 6 at one side α of the side plates 2 and 3, a side portion 9 at which the side edge of the upper plate 4 comes into contact for welding is shown in FIGS. ) Are flat. Then, the side edge of the upper plate 4 is in contact with the flat side portion 9, and the side end of the upper plate 4 is disposed at the intermediate portion in the width direction of the flange portion 6 of the side plates 2, 3. Below, the side end of the upper plate 4 is
Are connected by welding W. In this case, the wide portion 4a of the upper plate 4 is arranged at a place where the distance between them is large above the side plates 2 and 3, and the narrow portion 4b of the upper plate 4 is arranged above the side plates 2 and 3. It is arranged in a place where the interval is small.

Further, as shown in FIG. 2, a long side portion (lower side portion) β opposite to one side portion α of the two side plates 2 and 3 connected via the upper plate 4 has a longitudinal shape. A lower plate (connecting plate) 10 is bridged, and both end portions of the lower plate 10 are joined to the flange portions 6 of the side plates 2 and 3 by welding W. Thus, 2
A closed cross-sectional shape portion 11 is formed by the two side plates 2, 3, the upper plate 4, and the lower plate 10 (see FIG. 4A). The engine mount bracket 1 is attached to the lower part of the vehicle body frame by attaching the upper plate 4 to the vehicle body frame as described later. It is necessary to secure a space S (see FIG. 2) for accommodating tools and the like. For this reason, the lower plate 10 as the connecting plate cannot be a member having a larger area than the upper plate 4, so that
A narrow plate material having a smaller area than that of is used. The lower plate 10 is bridged between the side plates 2 and 3 at the other side β of the lower portion of the side plates 2 and 3 and at a position opposite to the engine mount suspension portion 8 described above.

Thus, the engine mount bracket 1
The upper plate 4 is bolted to the lower surface of a vehicle body frame (not shown) by using a pair of bolt insertion holes 12 formed in the upper plate 4 so that the engine mount bracket 1 is suspended at a position below the vehicle body frame. Fixed in state.
Then, with the engine mount attached to the engine side inserted and arranged between the side plates 2 and 3 of the engine mount bracket 1, bolts are passed through the bolt insertion holes 7 of the side plates 2 and 3 and the center hole of the engine mount. By disposing the engine mount, the engine mount is mounted on the engine mount suspension portion 8 of the engine mount bracket 1. The engine is supported by the above-described engine mount bracket 1 and, as shown in FIG. 5, an engine mount bracket 13 attached to the vehicle body frame at a position corresponding to the engine mount bracket 1, and these brackets 1, 13 Are supported at three points by an unillustrated engine mount bracket attached to the sub-frame 14 connected to the sub-frame 14.

According to the engine mount bracket 1 having such a configuration, the side plates 2, 3 and the upper plate 4 are formed as separate members and are connected by welding W. The yield of material can be made better than when the engine mount bracket 1 including the plate 4 is manufactured by press molding. That is, by separately manufacturing the side plates 2 and 3 and the upper plate 4 constituting the engine mount bracket 1 as separate and independent components, it is possible to reduce the ratio of a portion of the sheet metal material that is not used as a component. .

Further, a lower plate 10 as a connecting plate is attached to the engine mount bracket 1 having the side plates 2, 3 and the upper plate 4.
And the side plates 2 and 3, the upper plate 4 and the lower plate 10 constitute a closed cross-sectional shape portion 11, so that the rigidity of the engine mount bracket 1 is improved by the presence of the closed cross-sectional shape portion 11. Can be. Further, since the flanges 6 are provided on the side plates 2 and 3 so that the cross-sectional shape is U-shaped, the rigidity of the side plates 2 and 3 itself is improved, and the rigidity of the engine mount bracket 1 as a whole is improved. The upper plate 4 and the lower plate 10 can be welded to the side plates 2 and 3 in a stable state.

Since the two side plates 2 and 3 are formed in a symmetrical shape with respect to the center in the longitudinal direction, the side plates 2 and 3 are formed into the same shape by using one type of press forming die. 3
Can be used by turning them in opposite directions. Therefore, only one type of molding die can be used without using a dedicated molding die for each of the side plates 2 and 3.

Incidentally, the structure of the engine mount suspension portion 8 is such that when the engine mount attached to the engine side is cylindrical (see FIG. 14), the two side plates 2
Generally, a so-called "U-shape" having a U-shape composed of the one end side portions 2a and 3a and the upper plate 4 is used. The engine load F acts on the engine mount suspension portion 8 downward through an engine mount assembling bolt 15 disposed through the bolt insertion hole 7 as shown in FIGS. 6 and 7. The structure of the engine mount suspension 8 is as follows:
Although the shape is strong against the load in the vertical direction, when the size of the lower plate 10 cannot be sufficiently secured as in the engine mount bracket 1 of the present embodiment, the load F in the downward direction is
As a result, the side plates 2 and 3 may be deformed to open right and left as shown in FIG. 6, 7 and 9, the arrow f indicates the direction of the force (the force acting to open the side plates 2, 3) generated at the one end portions 2a, 3a of the side plates 2, 3 by the load F. Is shown.

When such a deformation occurs, a maximum stress is generated in the upper plate 4. In this case, the point of maximum stress generation is welding W
The maximum stress generation point P at this time is, as shown in FIGS. 8 and 9, one end of the welding W, that is, the end of the upper plate 4 close to the engine mount suspension 8 (the narrow side 4b). At both corners of the edge. Since the maximum stress generated at this point P is a tensile force, there is a concern that the side plates 2 and 3 and the upper plate 4 are separated at the point P as shown by a two-dot chain line in FIG.

Therefore, when the maximum stress value exceeds the standard, it is necessary to take measures to reduce the stress. Also, since the point P where the maximum stress is generated is at one end of the welding W,
In order to prevent the side plates 2 and 3 from being separated from the upper plate 4 at this point P, it is necessary to take measures to move the maximum stress generation location from the point P to another location.

As a countermeasure to prevent the two side plates 2 and 3 from being opened right and left, a reinforcing member 16 is provided at an appropriate position between the side plates 2 and 3 as shown by a dashed line in FIG. Alternatively, erection plates (not shown) are attached to the upper and lower portions of the engine mount suspension portion 8 to
It is conceivable to close the upper space and the lower space therebetween. However, when the reinforcing member 16 and the erection plate are attached,
There is a possibility that the engine mount attached to the engine and the reinforcing member 16 or the mounting plate may interfere with each other, and it is often difficult to attach the reinforcing member 16 or the mounting plate as described above due to design restrictions.

As another measure, it is conceivable to increase the thickness of the engine mount bracket 1. However, such measures increase the weight of the engine mount bracket 1 and may increase the cost in the processing step or the like depending on the thickness of the plate.

As another measure, it is conceivable to change the material of the engine mount bracket 1. However, such measures may significantly increase the weight and cost of the engine mount bracket 1 depending on the material.

In any case, the above measures are merely measures for reducing the absolute value of the stress, and even if such measures are adopted, one end of the weld W (the above-described maximum stress generation point P ) Still generates the maximum stress.

FIGS. 10 to 13 show an engine mount bracket 20 according to a second embodiment of the present invention. This engine mount bracket 20 reduces the value (magnitude) of the maximum stress generated. In addition, the maximum stress can be generated at a position apart from the point P at one end of the welding W. In FIGS. 10 to 13, the same parts as those in FIGS. 1 to 9 are denoted by the same reference numerals, and redundant description is omitted.

In the engine mount bracket 20 of the present embodiment, a specific portion of the upper plate 4 is deleted. Specifically, as shown in FIGS.
An edge portion (narrow portion 4b) of the upper plate 4 on the side of the engine mount suspension portion 8, and the two side plates 2, 3
A cut-out portion 21 having a U-shape in plan view is provided at an edge portion of the side plates 2 and 3 which is not in contact with one side portion α in a region arranged between the side plates 2 and 3. Other configurations are the same as those of the engine mount bracket 1 of the first embodiment.

The notch 21 provided in the upper plate 4 is set such that, when the width is L and the depth is H (see FIG. 10), ・ · L ≦ H. . That is, the depth H of the notch 21 is set to be equal to or more than の of the width L.

In the engine mount bracket 20 having such a configuration, the notch 21 is provided at a specific position of the upper plate 4. The point of deformation when the load of the engine is applied is closer to the depth side of the notch 21 from the deformation point Q ₁ (maximum stress generation point P) in the conventional case (the center of the upper plate 4). moves to closer the positions) Q ₂ in the side (see FIG. 13). Accordingly, the maximum stress occurrence location is not one location (point P) at one end of the weld W, but a line region G of the weld W connected to the one end,
The maximum stress is received in the line region of the weld W (see FIG. 11). The area of the maximum stress generation point G is
Since the section modulus is high with respect to the deformation in the left-right direction (the direction indicated by arrow K in FIG. 13) and the load can be received in a wide range, both side portions of the notch 21 (FIG.
1 and a region indicated by γ in FIG. 12). As a result, the maximum stress value is reduced.

Therefore, according to the engine mount bracket 20 of the present embodiment, not only the absolute value of the stress can be reduced, but also the location where the maximum stress value occurs is moved to a location away from one end of the welding W. it can. for that reason,
As in the case of the engine mount bracket 1 of the first embodiment described above, the yield of the bracket material can be improved, and the rigidity and stress concentration can also be improved. In addition, a part of the upper plate 4 is deleted so that the notch 21
Is provided, the weight of the engine mount bracket 20 is reduced by the weight of the plate material corresponding to the notch portion 21, and an effect of reducing the weight is obtained.

Although the embodiment of the present invention has been described above, the present invention is not limited to this embodiment.
Various modifications and changes are possible based on the technical concept of the present invention. For example, the deleted portion of the upper plate 4 (the notch 21)
May be not only a U-shape but also various shapes such as a semicircle or an ellipse. The number of the notches 21 is not limited to one, and a plurality of notches may be provided in the upper plate 4.

In the above-described first and second embodiments, the upper plate 4 is arranged horizontally and the side plates 2 and 3 are attached in a hanging state. However, the engine mount bracket is attached obliquely. Even in such a case, the present invention can be applied. In this case, the side plates 2,
Reference numeral 3 denotes a wall plate described in the claims, and upper plate 4 denotes a cover plate described in the claims.

[0031]

According to the first aspect of the present invention, there are provided two wall plates which are arranged to face each other and a cover plate which connects one side of each of the two wall plates to each other. Because the plate and the cover plate are joined by welding,
The two wall plates and the cover plate can be individually manufactured by press working, and the yield of the bracket material can be improved.

According to a second aspect of the present invention, a connecting plate is laid between the other side portions of the two wall plates connected to each other via the cover plate and opposite to one side portion, and is welded. Since the closed section is formed by the two wall plates, the cover plate, and the connecting plate, the rigidity of the engine mount bracket can be increased.

According to the third aspect of the present invention, one side and the other side of the two wall plates are bent with respect to the base of the wall plate, and at least one side of the side plate to which the cover plate is welded. Since the portion is a plane that is substantially perpendicular to the base, the rigidity of the wall plate itself can be increased, and the cover plate and the connecting plate can be stably attached to the wall plate.

According to a fourth aspect of the present invention, an edge portion of the cover plate on the engine mount mounting side and one side of the wall plate in a region arranged between the two wall plates. Since the notch portion is provided in the edge portion that is not in contact, the following operation and effect can be obtained. That is, by providing the notch in the cover plate, stress does not concentrate on one end (one position) of the welded portion between the wall plate and the cover plate, and the stress is reduced in the cutout of the cover plate in the welded portion. It will be received at the line portions on both sides of the notch. Along with this, the stress is dispersed in the cover plate portions on both sides of the notch, so that the maximum stress value can be reduced, and a bracket having a high section modulus, in which the maximum stress generation point is separated from one end of the welding. Can be transferred to parts. As a result, it is possible to prevent such a problem that a large stress is concentrated at one location and the cover plate is separated from the wall plate.

According to the fifth aspect of the present invention, since the wall plate is formed in a shape symmetrical with respect to the central axis in the longitudinal direction, the two wall plates are formed by the same forming die. The wall can be used with its orientation reversed, so that only one type of mold for wall plate production can be used. In addition, it is possible to save the trouble of managing parts for the wall plate.

[Brief description of the drawings]

FIG. 1 is a perspective view of an engine mount bracket according to a first embodiment of the present invention as viewed from above.

FIG. 2 is a perspective view of the engine mount bracket of FIG. 1 as viewed from below.

FIG. 3 is an enlarged plan view showing a main part of the engine mount bracket of FIG. 1; .

4A is a plan view of a portion indicated by an arrow X in FIG. 1, and FIG. 4B is a sectional view taken along line YY in FIG.

FIG. 5 is a perspective view showing an arrangement of the engine mount bracket of FIG. 1;

FIG. 6 is a perspective view showing a state in which an engine load is acting on an engine mount suspension portion of the engine mount bracket of FIG. 1;

FIG. 7 is a cross-sectional view showing a deformed state of a side plate and an upper plate when an engine load is applied to an engine mount suspension portion of the engine mount bracket of FIG. 1;

FIG. 8 is an enlarged perspective view of a main part showing a maximum stress generation point in the engine mount bracket of FIG. 1;

FIG. 9 is a plan view showing a portion indicated by an arrow Z in FIG.

FIG. 10 is a perspective view of an engine mount bracket according to a second embodiment of the present invention as viewed from above.

FIG. 11 is an enlarged plan view showing a main part of the engine mount bracket of FIG. 10;

12 is an enlarged perspective view of a main part showing a position where a maximum stress occurs in the engine mount bracket of FIG. 10;

FIG. 13 is a plan view showing a deformation point in the engine mount bracket of FIG. 10;

FIG. 14 is a perspective view showing a conventional engine mount bracket.

[Explanation of symbols]

 1, 20 Engine mount bracket 2, 3 Side plate (wall plate) 4 Upper plate (cover plate) 5 Base part 6 Flange part 8 Engine mount suspension part 9 Side part 10 Lower plate (connecting plate) 11 Closed section shape part 21 Notch Part G Welding line area H Depth of notch part L Width of notch part P Maximum stress generation point W Welding α One side (upper side) β Other side (lower side)

Claims (5)

[Claims] 1. An engine mount bracket for supporting an engine on a vehicle body frame, comprising: two wall plates disposed to face each other; and a cover plate connecting one side of each of the two wall plates to each other, An engine mount bracket, wherein two wall plates and the cover plate are joined by welding. 2. A connecting plate is laid between the other side portions of the two wall plates, which are opposite to one side portion of the two wall plates connected via the cover plate, and are joined by welding to form the two wall plates. The engine mount bracket according to claim 1, wherein a closed cross-section is formed by the cover plate and the connecting plate. 3. A side portion and another side portion of the two wall plates are bent with respect to a base portion of the wall plate, and at least a side portion of the one side portion to which the cover plate is welded is formed in the base portion. 3. The engine mount bracket according to claim 1, wherein the plane is substantially perpendicular to the plane. 4. An edge portion of the cover plate on the engine mount mounting side and not in contact with one side portion of the wall plate in a region arranged between the two wall plates. The engine mount bracket according to any one of claims 1 to 3, wherein a notch is provided. 5. The engine mount bracket according to claim 1, wherein said wall plate is formed in a shape symmetric with respect to a central axis in a length direction.