JP2005225360A - Mount structure for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cope with a difference in engine mounting center due to a change in engine type (absorb the difference), to sufficiently absorb energy at the time of a vehicle collision, and to easily increase the rigidity of an engine mount attachment point Provided is a vehicle mount structure that can be increased.
In a vehicle mount structure having a front side member 21 and a mount bracket for attaching an engine mount 25 to the front side member 21, the mount bracket includes a first mount bracket 23 having an engine mount attachment portion 23a, The first mount bracket 23 is provided behind the first mount bracket 23 with a distance in the vehicle front-rear direction and has a second mount bracket 24 having an engine mount mounting portion 24a.
[Selection] Figure 1

Description

  The present invention relates to a vehicle mount structure for attaching a vehicle engine to a side member of a vehicle body structural member via an engine mount.

  When the vehicle engine is attached to the side member of the vehicle body structural member via the engine mount, the engine mount may be attached directly to the side member, or the engine mount may be attached to the side member via a mount bracket. As a conventional example of the latter, for example, there is a vehicle mount structure disclosed in Patent Document 1. FIG. 5 is a perspective view of a conventional vehicle mount structure disclosed in Patent Document 1. In FIG.

  As shown in FIG. 5, in Patent Document 1, a locating hole 4 and a mounting hole 5 are formed in a tip bracket 3 provided via an insulator 2 at the tip of a mounting piece 1 of an engine (not shown). By inserting the locating piece 7 of the mounting bracket 6 fixed to the front side member 10 into the locating hole 4 of the tip bracket 3, the mounting surface portion 8 of the mount bracket 6 and the mounting holes 5, 9 of the tip bracket 3 are aligned. Disclosed is a technique that allows the brackets 3 and 6 to be miniaturized by attaching the front end bracket 3 to the mount bracket 6 in a state where the brackets 3 and 6 are mounted without having to secure a movement allowance for alignment between the brackets 3 and 6. Has been.

JP-A-5-254459

  However, when a combination of various engines (various engines with different displacements) and transmissions (manual truss transmissions, automatic transmissions, etc.) are mounted on a single (same structure) platform, the vehicle body structure such as side members The engine mounting center (BHC), which is the relative position of the engine center of gravity with respect to the member, varies little by little depending on the engine type. Therefore, in order to absorb the difference, it is necessary to classify the engine mount on the engine side and to provide a margin for the mounting point of the mount bracket on the vehicle body side.

  However, in the conventional vehicle mount structure described in Patent Document 1, two attachments formed on the mount bracket 6 are required to cope with (absorb) the difference in the engine mounting center associated with the change in the engine type. It is necessary to relatively widen the distance between the holes 9 in the vehicle front-rear direction, and for this purpose, the mount bracket 6 needs to be elongated in the vehicle front-rear direction. And when the mount bracket 6 becomes long in the vehicle front-rear direction, the strength of the front side member 10 is locally increased at the portion where the mount bracket 6 is attached. For this reason, although the engine mount mounting part of the front side member 10 also needs to be crushed as a crushable length at the time of a vehicle collision, the engine mount mounting part of the front side member 10 becomes difficult to be crushed and absorbs energy at the time of the vehicle collision. There was a problem that there was not enough.

  Therefore, in view of the above circumstances, the present invention can cope with (differs in) the difference in the engine mounting center accompanying the change in the engine type, and can sufficiently absorb the energy at the time of the vehicle collision. It is an object to provide a mounting structure for a vehicle.

  A vehicle mount structure according to a first aspect of the present invention that solves the above-described problem is a vehicle mount structure that includes a side member that extends in the vehicle front-rear direction and a mount bracket that attaches an engine mount to the side member. The mount bracket includes the engine A first mount bracket having a mount mounting portion; and a second mount bracket provided behind the first mount bracket at a distance in the vehicle front-rear direction from the first mount bracket and having the engine mount mounting portion. And a mounting bracket.

  The vehicle mount structure of the second invention is the vehicle mount structure of the first invention, wherein a hole or a bead is formed in the side member between the first mount bracket and the second mount bracket. And

  The vehicle mount structure according to a third aspect of the present invention is the vehicle mount structure according to the first or second aspect, wherein the first mount bracket and the second mount bracket have the same shape.

  According to the vehicle mount structure of the first aspect of the present invention, the mount bracket is not an integral one as in the prior art, but the first mount bracket having an engine mount mounting portion and the first mount behind the first mount bracket. Since the bracket and the second mount bracket having an engine mount mounting portion are provided with a space in the vehicle front-rear direction, the engine mount center for each engine type, that is, the engine mounting center is the vehicle front-rear direction. Even if it is displaced, the various engine mounting centers (engine mount centers) can be positioned between the engine mount mounting portion of the first mount bracket and the engine mount mounting portion of the second mount bracket. The engine can be reliably supported without being cantilevered. In addition, since the mount bracket is divided into the first mount bracket and the second mount bracket and has an interval in the vehicle front-rear direction, the side members are easily crushed between the mount brackets when the vehicle collides. The energy absorption performance at the time of a vehicle collision can be enhanced.

  According to the vehicle mount structure of the second aspect of the present invention, since the hole or bead is formed in the side member between the first mount bracket and the second mount bracket, the side member is further easily crushed between the mount brackets.

  According to the vehicle mount structure of the third invention, since the first mount bracket and the second mount bracket have the same shape, the mount bracket can be shared in the front and rear, and the design cost and production cost of the mount bracket are reduced. You can also.

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

  1 is a perspective view of a vehicle mount structure according to an embodiment of the present invention, FIG. 2 is a side view of the vehicle mount structure, FIG. 3 is an exploded perspective view of the vehicle mount structure, and FIG. It is the schematic explaining the difference of the engine mount center according to this change.

  When a vehicle engine is mounted on a vehicle body, the engine is supported at, for example, four locations on the front, rear, left and right sides by vehicle body structural members such as a front side member and a cross member. In this case, for example, the left and right two portions of the engine are supported by the left and right front side members, respectively, and the two front and rear portions of the engine are supported by the cross member. Among these, FIGS. 1 to 3 show the right vehicle mounting structure.

  As shown in FIGS. 1 to 3, the right front side member 21, which is a part of the vehicle body structural member, extends in the vehicle front-rear direction, and the right wheel house 22 is fixed to the outer side surface 21 a by welding or the like. ing. A vehicle engine or transmission (not shown) is located inside the front side member 21 and is disposed between the front side member 21 and a left front side member (not shown). 1 to 3, the left side in the figure is the vehicle front side, and the right side in the figure is the vehicle rear side, as indicated by arrows.

  Then, a first mount bracket 23 and a second mount bracket 24 are attached to the front side member 21 as vehicle body side mount brackets at intervals in the vehicle front-rear direction.

  The first mount bracket 23 has an engine mount mounting portion 23a formed in a convex shape and a flange portion 23b provided around the engine mount mounting portion 23a. An engine mount mounting hole 23d with a welding nut 23e is formed at the center of the engine mount mounting surface 23c, which is the upper surface of the engine mount mounting portion 23a. The flange portion 23b is bent so that the portions 23b-1, 23b-2, and 23b-3 are along the inner side surface 21b and the upper surface 21c of the front side member 21 and the inner side surface 22a of the wheel house 22, respectively. Has been.

  The second mount bracket 24 has the same shape as the first mount bracket 23. That is, the first mount bracket 24 has an engine mount mounting portion 24a formed in a convex shape, and a flange portion 24b provided around the engine mount mounting portion 24a. An engine mount mounting hole 24d with a welding nut 24e is formed at the center of the engine mount mounting surface 24c, which is the upper surface of the engine mount mounting portion 24a. The flange portion 24b is bent so that the portions 24b-1, 24b-2, 24b-3 are along the inner side surface 21b and the upper surface 21c of the front side member 21 and the inner side surface 22a of the wheel house 22, respectively. Has been.

  A concave portion 21d and a concave portion 21e are formed on the inner side surface 21b and the upper surface 21c of the front side member 21, respectively. Further, the inner side surface 21b and the upper surface 21c of the front side member 21 at the rear of the vehicle with respect to the concave portions 21d and 21e are formed. A recess 21f and a recess 21g are formed respectively. That is, the front recesses 21d and 21e and the rear recesses 21f and 21g are spaced in the vehicle front-rear direction.

  The first mount bracket 23 is positioned by fitting the flange portions 23b-1 and 23b-2 to the front recesses 21d and 21e. In this state, the flange portions 23b-1 and 23b-2 are located inside the front side member 21. The side surface 21b (the bottom surface of the recess 23d) and the top surface 21c (the bottom surface of the recess 23e) are welded and attached to the front side member 21. Similarly, the first mount bracket 24 is positioned by fitting the flange portions 24b-1 and 24b-2 to the recesses 21f and 21g on the rear side. In this state, the flange portions 24b-1 and 24b-2 are positioned on the front side. The member 21 is welded to the inner side surface 21b (the bottom surface of the recess 23d) and the upper surface 21c (the bottom surface of the recess 23e) and is attached to the front side member 21.

  Thus, the first mount bracket 23 and the second mount bracket 24 are provided on the front side member 21 with a space in the vehicle front-rear direction. Note that the recesses 21d, 21e, 21f, and 21g are not necessarily formed in the front side member 21, and both the mounting brackets 23 and 24 may be directly attached to the surface (the inner side surface 21b and the upper surface 21c) of the front side member 21. .

  The distance between the first mount bracket 23 and the second mount bracket 24 in the vehicle front-rear direction is relative to the center of the various engines to be mounted on the vehicle, that is, the center of gravity of the engines relative to the front side member 21 in the vehicle front-rear direction. Both positions are positioned between the engine mount mounting portion 23a (engine mount mounting hole 23d) of the first mount bracket 23 and the engine mount mounting portion 24a (engine mount mounting hole 23d) of the second mount bracket 24. Set. When the engine mounting center is located on the vehicle front side of the engine mount attachment portion 23a (engine mount attachment hole 23d) of the first mount bracket 23, or when the engine mount attachment portion 24a (engine mount attachment hole 23d of the second mount bracket 24) is located. ), The engine cannot be reliably supported because it is cantilevered. In contrast, the engine mounting center is between the engine mount mounting portion 23a (engine mount mounting hole 23d) of the first mount bracket 23 and the engine mount mounting portion 24a (engine mount mounting hole 24d) of the second mount bracket 24. When located, the engine can be reliably supported by the front and rear mounting brackets 23 and 24.

  Various engines are attached to these mount brackets 23 and 24 via an engine mount 25. The engine mount 25 has a rubber bush (insulator) 26, and the rubber bush 26 can absorb engine vibration.

  More specifically, the engine mount 25 includes a rubber bush 26, a bracket mounting member 27, a rubber bush holding member 28, an engine mounting member 29, a wheel house mounting member 30, a shaft member 31, and the like. The bracket mounting member 27 is a plate-like member that is long in the vehicle front-rear direction, and the left and right side portions 27a, 27b are bent upward to form a trapezoidal side view, and rubber is attached to the both side portions 27a, 27b. The bush holding member 28 is welded. The bracket mounting member 27 is inserted into the mounting holes 27c and 27d formed at both ends of the bracket mounting member 27 and the mounting holes 23d and 24d of the mounting brackets 23 and 24 by inserting the bolts 35 and 36 into the welding nuts 23e and 24e. Are attached to the engine mount attachment portions 23a, 24a of the mount brackets 23, 24. The mounting of the engine mount 25 (bracket mounting member 27) to the mounting brackets 23 and 24 is not limited to bolting, and may be, for example, welding. Note that the bracket mounting member 27 is made thinner than the mount brackets 23 and 24 and the like in order to prevent the strength of the front side member 21 from becoming excessively large.

  The rubber bush holding member 28 is formed in a cylindrical shape, and holds the columnar rubber bush 26 so as to surround the periphery thereof. The engine mounting member 29 is formed in a U shape in plan view, and the rubber bush 26 and the rubber bush holding member 28 are disposed inside the side portions 29a and 29b. A shaft member 31, which is a bolt, is inserted into both side portions 29 a and 29 b of the engine mounting member 29 and the rubber bush 26, and a nut 32 is screwed to the end portion. In other words, the engine mounting member 29, the rubber bush 26, the rubber bush holding member 28, and the bracket mounting member 27 are coupled via the shaft member 31. Further, the wheel house mounting member 30 protrudes from the rubber bush holding member 28, and a tip end portion is attached to a mounting portion 22 c protruding from the upper surface 22 b of the wheel house 22 by a bolt 33.

  The vehicle engine is attached to the engine attachment member 29 by bolts 33. At this time, the center of the engine mount 25 coincides with the mounting center of the engine (the position of the engine center of gravity in the vehicle front-rear direction and the vertical direction). That is, since the engine mounting center (center of gravity position) differs depending on the engine type, the rubber bushing is changed by changing the welding position of the rubber bushing holding member 28 to the bracket mounting member 27 so as to have an engine mount center corresponding to each engine mounting center. An engine mount 25 in which the positions of the holding member 28, the rubber bush 26, and the engine mounting member 29 in the vehicle front-rear direction and the vertical direction are adjusted is prepared for each engine.

  As described above, since the first mount bracket 23 and the second mount bracket 24 are spaced apart in the vehicle front-rear direction, the center of the engine mount is changed according to the change of the engine type as illustrated in FIG. Even if it is displaced in the front-rear direction, this is absorbed and the center of any engine mount 25 is located between the engine mount mounting portion 23a of the first mount bracket 23 and the engine mount mounting portion 24a of the second mount bracket 24. In this case, of course, the length of the bracket mounting member 27 in the longitudinal direction of the vehicle and the positions (intervals) of the mounting holes 27c and 27d are the same for all the engine mounts 25, and the mounting brackets 23 and 24 (engine mount mountings) at regular intervals are the same. Any engine mount 25 can be attached to the parts 23a, 24a). That is, even if the engine type is changed, it is not necessary to change the mounting positions of the mount brackets 23 and 24 at all, and only the engine mount 25 may be replaced in accordance with the change of the engine type.

  As described above, according to the vehicle mount structure of the present embodiment, the mount bracket attached to the front side member 21 is not an integral one as in the prior art, but the first mount bracket 23 having the engine mount attachment portion 23a. And the first mount bracket 23 and the second mount bracket 24 provided with an interval in the vehicle front-rear direction and having an engine mount mounting portion 24a. Even if the center of the engine mount 25 for each engine type, that is, the engine mounting center is shifted in the vehicle front-rear direction, this is absorbed and the various engine mounting centers (engine mounting centers) are engine mount mounting portions of the first mount bracket 23. 23a and second mount bracket 24 for engine mounting It is possible to position between the parts 24a, can be reliably support the engine not to cantilever support.

  Moreover, since the mount bracket is divided into the first mount bracket 23 and the second mount bracket 24 and has an interval in the vehicle front-rear direction, the front side member 21 is located between the mount brackets 23 and 24 in the vehicle. Since it is easily crushed at the time of a collision, the crushable length can be extended and the energy absorption performance at the time of a vehicle collision can be enhanced.

  Further, since the mount bracket is divided into the first mount bracket 23 and the first mount bracket 24 and has an interval in the vehicle front-rear direction, the respective engine mount attachment surfaces 23c, 24d can be made small. Therefore, for example, the rigidity of the engine mount attachment point can be easily increased by tightening the bolts 35 and 36, which is advantageous from the viewpoint of reducing vibration noise.

  In addition, since the mount bracket is divided into the first mount bracket 23 and the second mount bracket 24 and has a space in the vehicle front-rear direction, the front side member 21 is mounted between the mount brackets 23 and 24 in FIGS. 1 and 3. As shown, the front side member 21 can be more easily crushed between the mount brackets 23 and 24 by providing a hole 21h or a bead (not shown).

  Furthermore, since the first mount bracket 23 and the second mount bracket 24 have the same shape, the mount bracket can be shared in front and rear, and the design cost and manufacturing cost of the mount bracket can be reduced.

  Although the right vehicle mount structure has been described above, the left vehicle mount structure may have the same configuration as the right vehicle mount structure.

  The present invention relates to a vehicle mount structure, and is particularly useful when applied to various engines mounted on a single (same structure) platform.

1 is a perspective view of a vehicle mount structure according to an embodiment of the present invention. It is a side view of the mount structure for vehicles. It is a disassembled perspective view of the said vehicle mount structure. It is the schematic explaining the difference in the engine mount center according to the change of engine classification. It is a perspective view of the conventional vehicle mount structure.

Explanation of symbols

21 Front side member 21a Outer side surface 21b Inner side surface 21c Upper surface 21d, 21e, 21f, 21g Recess 22 Wheel house 22a Inner side surface 22b Upper surface 22c Mounting portion 23 First mount bracket 23a Engine mount mounting portion 23b Flange portion 23b-1, 23b- 2, 23b-3 Flange portion 23c Engine mount mounting surface 23d Engine mount mounting hole 23e Weld nut 24 Second mount bracket 24a Engine mount mounting portion 24b Flange portion 24b-1, 24b-2, 24b-3 Flange portion 24c Engine mount mounting Surface 24d Engine mount mounting hole 24e Weld nut 25 Engine mount 26 Rubber bush 27 Bracket mounting member 27a, 27b Side portion 27c, 27d Mounting hole 28 Rubber bush Interview holding member 29 engine mounting member 29a, 29b sides 30 wheel house mounting member 31 shaft member (volts)
32 Nut 33, 34, 35, 36 Bolt

Claims (3)

A side member extending in the longitudinal direction of the vehicle;
In a vehicle mounting structure having a mounting bracket for attaching an engine mount to the side member,
The mount bracket is provided with a first mount bracket having a mounting portion for the engine mount, and at a distance from the first mount bracket to the vehicle front-rear direction behind the first mount bracket. And a second mounting bracket having a mounting portion. The vehicle mount structure according to claim 1,
A vehicle mount structure, wherein a hole or a bead is formed in the side member between the first mount bracket and the second mount bracket. The vehicle mount structure according to claim 1 or 2,
The vehicle mount structure, wherein the first mount bracket and the second mount bracket have the same shape.

Images