JP4324262B2 - Automotive power unit support structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a power unit support structure, and more particularly to a power unit support structure for an automobile that supports a power unit to a suspension cross member installed between left and right side frames via an engine mount.
[0002]
[Prior art]
As disclosed in, for example, Japanese Patent Application Laid-Open No. 1-186429, an automobile power unit is supported via an engine mount on a suspension cross member installed between left and right side frames extending in the longitudinal direction of the vehicle body. There is something.
[0003]
On the other hand, there is a case where the suspension cross member is arranged at the rear of the vehicle body of the power unit due to the shape of the suspension cross member due to the arrangement of the suspension provided on the suspension cross member or the layout of the power unit or the like. In such a power unit arrangement, there is a power unit support structure in which the left and right ends of the power unit are respectively supported on the left and right side frames via the front engine mount, and the rear portion of the power unit is supported on the suspension cross member via the rear engine mount. May be taken.
[0004]
In such a power unit support structure, the power unit and the suspension cross member are often arranged apart from each other due to restrictions such as the suspension, the fitting parts attached to the chassis, and the layout of the power unit. For example, FIG. Thus, the rear engine mount 100 that supports the rear portion of the power unit on the suspension cross member is provided with a mount bracket 103 that is inclined toward the power unit 101 on the suspension cross member 102, while a power unit side bracket 105 is provided on the power unit 101, The mount bracket 103 and the power unit side bracket 105 are connected via a buffer member 106.
[0005]
[Problems to be solved by the invention]
According to the power unit support structure in which the left and right ends of the power unit are respectively supported on the side frames via the front engine mount and the rear part of the power unit is supported on the suspension cross member via the rear engine mount, the load of the power unit is mainly applied to the front part. Since it is supported by the left and right side frames via the engine mount, the load acting on the suspension cross member via the rear engine mount can be greatly reduced, and the suspension cross member can be simplified.
[0006]
However, the power unit swings in the pitching direction about the axis connecting the front engine mounts that support the left and right ends of the power unit on the side frames, and the load in the pitching direction from the power unit is suspended via the rear engine mount. It will be received by the cross member.
[0007]
Accordingly, the mounting bracket 103 of the rear engine mount 100 shown in FIG. 4 becomes longer as the power unit 101 and the suspension cross member 102 are separated from each other, and the front end of the mounting bracket 103 from the power unit side bracket 105 via the buffer member 106. Since the load P in the substantially vertical direction is repeatedly input to the portion and is received by the suspension cross member 102, the mount bracket 103 disposed at an inclination to the suspension cross member 102 is subjected to compression and mounting of the mount bracket 103. In addition to the load in the tensile direction, the load in the bending and torsional directions repeatedly acts, so that the mount bracket 103 is required to have high strength and rigidity. As a result, the plate thickness and the size of the mount bracket 103 are increased. Increase in weight and manufacturing cost of the engine mount 100 is concerned.
[0008]
Accordingly, an object of the present invention made in view of such a point is to provide a power unit support structure for an automobile in which the load from the power unit is reliably transmitted and distributed to the suspension cross member and the size and weight of the engine mount can be reduced. It is in.
[0009]
The power unit support structure for an automobile according to claim 1, which achieves the above object, includes a front cross member constructed between left and right side frames extending in the longitudinal direction of the vehicle body, and the side behind the front cross member. A power unit for an automobile comprising a suspension cross member constructed between frames and a center member constructed between the front cross member and the suspension cross member, and supporting the power unit on the suspension cross member via an engine mount. in the support structure, the engine mount, the power unit-side bracket having a base end is mounted supported by the power unit, and a buffer member coupled to the distal end of the power unit-side bracket, the upper is bonded tip the buffer member SL Power unit Comprising a mounting bracket for supporting the compression-tension direction the vertical load from the side bracket, the proximal end portion of the mounting bracket to the coupling portion between the center member and the suspension cross member on the upper surface of the suspension cross member The buffer member is arranged so as to be attached and supported and to be superposed on the coupling portion in a top view .
[0010]
According to the first aspect of the present invention, the load repeatedly input from the power unit side bracket via the buffer member to the mount bracket whose base end is attached and supported to the suspension cross member is mainly in the compression / tensile direction of the mount bracket. Therefore, the load from the power unit can be transmitted to the suspension cross member reliably and efficiently, and the required strength and rigidity of the mount bracket can be reduced, and the thickness and size of the mount bracket can be reduced. Can be reduced in size and weight. Furthermore, the load repeatedly input from the power unit side bracket to the mount bracket via the buffer member can be distributed and transmitted to other vehicle body members such as the side frame via the suspension cross member and the center member.
[0011]
The invention of the power unit support structure for an automobile according to claim 2 includes a front cross member constructed between left and right side frames extending in the longitudinal direction of the vehicle body, and between the side frames behind the front cross member. A suspension cross member that is installed, and a center member that is installed between the front cross member and the suspension cross member. The power unit is supported on the left and right side frames via a pair of front engine mounts, and the rear part. In the automotive power unit support structure that is supported by the suspension cross member via an engine mount, the rear engine mount is connected to a power unit side bracket having a base attached to and supported by the power unit, and a tip of the power unit side bracket. It has been a buffer member, and a mounting bracket for supporting the compression-tension direction the vertical load from above Symbol power unit bracket is bonded tip the buffer member, a base end portion of the mounting bracket Is mounted and supported on a joint portion between the center member and the suspension cross member on the upper surface of the suspension cross member, and the buffer member is disposed so as to overlap with the joint portion when viewed from above. To do.
[0012]
According to the invention of claim 2, the power unit is supported on the left and right side frames by the pair of front engine mounts so that the load in the rolling direction of the power unit is supported by both front engine mounts. Only the load in the pitching direction, which swings around the axis connecting the engine mount, acts mainly, and the load input from the power unit side bracket to the mount bracket via the buffer member mainly compresses the mount bracket.・ Because it is only in the pulling direction, the load from the power unit is transmitted to the suspension cross member reliably and efficiently, and the required strength and rigidity of the mounting bracket can be reduced, and the mounting bracket plate thickness can be reduced and the size can be reduced. After Weight reduction of the engine mount is possible. Furthermore, the load repeatedly input from the power unit side bracket to the mount bracket via the buffer member can be distributed and transmitted to other vehicle body members such as the side frame via the suspension cross member and the center member.
[0013]
According to a third aspect of the present invention, in the automotive power unit support structure according to the second aspect, front engine mounts are disposed on the left and right side frames, respectively, and are close to the axial line connecting the two front engine mounts. The power unit is constructed between the left and right side frames via the front engine mounts so that the center of gravity of the power unit is located.
[0014]
According to the invention of claim 3, the power unit is constructed between the left and right side frames via the front engine mount so that the center of gravity of the power unit is located in the vicinity of the axis line connecting the two front engine mounts. The weight of the rear engine mount is supported by the left and right side frames via both front engine mounts, the load in the pitching direction acting on the rear engine mount is greatly reduced, and components of the rear engine mount such as the mount bracket and the power plant side bracket Further, the required strength and rigidity of the suspension cross member can be reduced, and the rear engine mount and the suspension cross member can be further reduced in size and weight.
[0017]
According to a fourth aspect of the present invention, in the automobile power unit support structure according to any one of the first to third aspects, the suspension cross member supports the base end portion of the mount bracket while the center member is coupled. The center member mounting portion is formed to protrude.
[0018]
According to the invention of claim 4, the suspension cross member, mounting bracket by forming the center member mounting portion for supporting the base end portion, the suspension cross member and the center member of the load from the mounting bracket with coupling the center member Thus, it is possible to reliably and efficiently carry out distributed transmission.
[0019]
The invention according to claim 5 is the power unit support structure for an automobile according to any one of claims 1 to 4, wherein a power unit side bracket whose base end is attached and supported to the power unit extends toward the rear of the vehicle body, The mount bracket extends in the vertical direction, has a base end portion attached to and supported by the suspension cross member (33), and a tip end portion coupled to the tip end of the power unit side bracket via a buffer member.
[0020]
According to the invention of claim 5 , the power unit side bracket is extended toward the rear of the vehicle body, the mount bracket is extended in the vertical direction, and the base end portion is attached and supported to the suspension cross member. Even when the members are separated from each other, the load input to the tip end portion of the mount bracket via the buffer member can be reliably transmitted to the suspension cross member.
[0021]
According to a sixth aspect of the present invention, in the automobile power unit support structure according to the fifth aspect , the buffer member includes an outer cylinder, an inner cylinder disposed in the outer cylinder, and the outer cylinder and the inner cylinder. A cylindrical bush including an elastic member interposed between the outer cylinder and the front end of the power unit bracket, and the inner cylinder is attached to the distal end of the mount bracket by a locking shaft inserted into the inner cylinder. It is characterized by being supported.
[0022]
According to the invention of claim 6, the power unit side bracket is efficiently swung by the elastic deformation of the elastic member interposed between the outer tube and the inner tube of the cylindrical bush and the relative swing of the inner tube and the locking shaft. Can be transmitted to the tip of the mount bracket in alignment with the direction of compression and tension of the mount bracket.
[0023]
According to a seventh aspect of the present invention, in the power unit support structure for an automobile according to the sixth aspect , the mount bracket is mounted and supported at the base end on the upper surface of the suspension cross member, and the upper end accommodates the cylindrical bush. The cross section is substantially U-shaped with the front side of the vehicle body open.
[0024]
According to the seventh aspect of the present invention, the mounting bracket is configured to have a substantially U-shaped cross section for accommodating the cylindrical bushing, whereby the cylindrical bushing is accommodated in the mounting bracket and the rear engine mount can be made compact.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a power unit support structure for an automobile according to the present invention will be described with reference to FIGS.
[0026]
1 is a plan view of the main part of the front vehicle body structure, FIG. 2 is a cross-sectional view taken along the line II of FIG. 1, and FIG. 3 is an exploded perspective view of the main part of FIG. It is the forward direction.
[0027]
The front vehicle body structure 1 is provided with side frames 11 having a substantially U-shaped cross section along lower ends of wheel aprons (not shown) disposed on the left and right sides of the engine room 2, respectively. Thus, a closed cross-sectional shape extending in the longitudinal direction of the vehicle body is formed.
[0028]
A front cross member 15 having a closed cross-sectional shape extending in the vehicle width direction is installed between the front ends of the left and right side frames 11, and a toe board (which is arranged in parallel with the front cross member 15 to partition the engine room 2 and the vehicle compartment) A suspension cross member 21 extending in the vehicle width direction facing the toe board is installed between the left and right side frames 11 in front of the toe board (not shown). A suspension device is attached and supported.
[0029]
Further, a substantially central portion in the vehicle width direction of the front cross member 15 and a substantially central portion in the vehicle width direction of the suspension cross member 21 are connected by a center member 27 extending in the longitudinal direction of the vehicle body, thereby improving the strength and rigidity of the front vehicle body structure 1. Secured.
[0030]
The power unit 41 including the engine 42, the transmission 43, and the like is elastically attached to the left and right side frames 11 via the front engine mounts 28 at both end positions near the center of gravity G of the power unit 41 in a state where the engine 42 is placed horizontally. The rear portion of the power unit 41 is elastically supported by the suspension cross member 21 by the rear engine mount 30.
[0031]
In other words, the power unit 41 is paired with the pair of front engine mounts 28 in a state where the center of gravity G of the power unit 41 coincides with or is close to the axis a connecting the left and right front engine mounts 28 disposed on the left and right side frames 11. The power unit 41 is elastically supported by the suspension cross member 21 by the rear engine mount 30.
[0032]
Accordingly, the weight of the power unit 41 is supported by the left and right side frames 11 via both front engine mounts 28, and the load in the rolling direction of the power unit 41 is supported by the left and right side frames 11 by both front engine mounts 28. The power unit 41 is prevented from swinging in the rolling direction, and only the load P in the pitching direction of the power unit 41 swinging about the axis a connecting the left and right front engine mounts 28 is mainly suspended via the rear engine mount 30. It is transmitted to and received by the cross member 21, and is distributed and transmitted to other vehicle body members such as the side frame 11 via the suspension cross member 21 and the center member 27.
[0033]
The suspension cross member 21 installed between the left and right side frames 11 has a closed cross-sectional shape that is continuous in the vehicle width direction by an upper member 22 and a lower member 23 in which the front edge and the rear edge are welded to each other as shown in FIGS. As a result, the cross-sectional shape of the suspension cross member 21 is constrained to improve the rigidity, and both side portions coupled to the side frame 11 are pushed forward to ensure the coupling strength with the side frame 11. ing.
[0034]
Further, the center part in the vehicle width direction of the lower member 23 of the suspension cross member 21 is projected forward, and the center member mounting part 24 is formed by overlapping the rear end 27a of the center member 27 from below and bolting.
[0035]
The rear engine mount 30 that supports the rear portion of the power unit 41 includes a mount bracket 31 having a base end portion 31a attached and supported on the upper surface of the suspension cross member 21, and a rear end of the power unit 41 having a base end 33a attached and supported to the rear of the vehicle body. The power unit side bracket 33 is extended, and is formed by a cylindrical bush 35 serving as a buffer member that connects the tip end portion 31 b of the mount bracket 31 and the tip end 33 b of the power unit side bracket 33.
[0036]
The mount bracket 31 is formed of a pair of side surfaces 31B that are bent forward from both sides of the rear surface 31A and the rear surface 31A and are opposed to each other so as to accommodate the cylindrical bush 35. The front side of the vehicle body is opened and extends in the vertical direction. The reinforcing flange 31c is substantially U-shaped in cross section, curved so that the front edge upper portion of the side surface 31 bulges forward of the vehicle body, and continues from the upper edge of the rear surface 31A to the front edge of the side surface 31B. Is formed.
[0037]
A substantially U-shaped base end portion 31a in plan view formed by the lower end edges of the rear surface 31A and the side surface 31B of the mount bracket 31 is welded to the upper surface of the upper member 22 forming the suspension cross member 21, and the base end portion The front end of 31 a is welded to the upper surface of the center member mounting portion 24 formed on the lower member 23 and overlaps with the rear portion 27 a of the center member 27 that is bolted to the center member mounting portion 24 via the center member mounting portion 24. It is configured.
[0038]
Therefore, the rigidity of the mounting portion of the mounting bracket 31 or the central portion of the suspension cross member 21 in the vicinity of the mounting portion is improved by coupling the center member 27, and the load from the mounting bracket 31 is applied to the suspension cross member 21 and the center member 27. It is configured so that it is reliably transmitted to the other vehicle body members such as the side frames 11 via the suspension cross member 21 and the center member 27.
[0039]
An insertion hole 31d is formed in the upper end portion 31b of the mount bracket 31 supported by welding the base end portion 31a to the upper surface of the suspension cross member 21 so as to face the side surfaces 31B facing each other.
[0040]
The power unit side bracket 33 has a base end 33a coupled and supported at the rear portion of the power unit 31, and extends substantially horizontally toward the rear of the vehicle body, and the cylindrical bush 35 is coupled to the distal end 33b.
[0041]
The cylindrical bush 35 is disposed in a non-contact state with the outer cylinder 35a within the outer cylinder 35a, and an outer cylinder 35a having a central axis b that is welded to the tip 31b of the power unit side bracket 31 and extends in the vehicle body width direction. The inner cylinder 35b is formed by an elastic material 35c such as rubber which is interposed between the outer cylinder 35a and the inner cylinder 35b and integrally couples the outer cylinder 35a and the inner cylinder 35b.
[0042]
The cylindrical bush 35 attached to the front end 33b of the power unit side bracket 33 is inserted between both side surfaces 31B from the vehicle body front side of the opening mount bracket 31 and is inserted into one of the insertion holes in a state corresponding to the both insertion holes 31d. The cylindrical bush 35 is accommodated in the mount bracket 31 by being locked to the distal end portion 31b of the mount bracket 31 by a locking shaft, for example, a bolt 37, passed through the inner cylinder 35b and the other insertion hole 31d from the hole 31d. Thus, the rear engine mount 30 is made compact.
[0043]
The insertion hole 31d through which the bolt 37 that locks the cylindrical bush 35 passes is tangential to the center of the bolt 37 that swings up and down as the power unit 41 swings, in other words, the input direction of the load P from the power unit 40. The extension line is drilled in a range c located in the base end portion 31 a to be welded to the suspension cross member 21.
[0044]
In other words, the insertion hole 31d is configured so that a load P in the vertical pitching direction from the power unit 40 input to the mount bracket 31 via the power unit side bracket 31, the cylindrical bush 35 and the bolt 37 is a compression / tensile direction of the mount bracket 31. It is set to the range that affects.
[0045]
According to the power unit support structure for an automobile configured as described above, the power unit 41 is supported on the left and right side frames 11 by the pair of front engine mounts 28 in the vicinity of the center of gravity G. Only the load P in the pitching direction that swings about the axis line a connecting the engine mounts 28 acts mainly, and the load P from the power unit 41 is input from the power unit side bracket 33 to the mount bracket 31 via the cylindrical bush 35. Is mainly in the compression / tension direction of the mounting bracket 31 extending in the vertical direction with the base end portion 31a attached and supported on the suspension cross member 21 in the vertical direction, and the suspension cross member reliably transfers the load from the power unit 41. 21 and the center member 27 Reduction of required strength and stiffness of the mount bracket 31 is obtained as well as, reduction and miniaturization of the thickness of the mounting bracket 31 is enabled, allowing size and weight of the rear engine mount 30.
[0046]
Further, since the power unit side bracket 33 extends toward the rear of the vehicle body, the mount bracket 31 extends in the vertical direction, and the base end portion 31a is attached to and supported by the suspension cross member 21, so that the power unit 41 and the suspension cross member 21 are also supported. Even when they are separated from each other, the load P input to the tip 31b of the mount bracket 31 via the cylindrical bush 35 can be reliably transmitted to the suspension cross member 21, and the outer cylinder 35a and the inner cylinder of the cylindrical bush 35 can be transmitted. By the elastic deformation of the elastic member 35c interposed between the elastic member 35b and the relative swing of the inner cylinder 35b and the bolt 37, the swing of the power unit side bracket 33 is efficiently aligned with the compression / tensile direction of the mount bracket 31. It is ensured that it is transmitted to the tip 31b of the mount bracket 31. That.
[0047]
In the embodiment described above, the cylindrical bush is used as the buffer member. However, other buffer members can be used, and the shape of the mount bracket can be appropriately changed. Without being limited to the form, various modifications can be made without departing from the spirit of the invention.
[0048]
【The invention's effect】
According to the power unit support structure for an automobile of the present invention described above, the power unit acting repeatedly from the power unit side bracket through the buffer member is input to the mount bracket whose base end is attached and supported to the suspension cross member. Since the load acts in the direction of compression and tension of the mount bracket, the load from the power unit is reliably transmitted to the suspension cross member, and the required strength and rigidity of the mount bracket can be reduced, and the mount bracket thickness and size can be reduced. This makes it possible to reduce the size and weight of the engine mount and contribute to reducing the weight of the automobile.
[Brief description of the drawings]
FIG. 1 is a plan view showing a main part of a front vehicle body structure for explaining an embodiment of a power unit support structure for an automobile according to the present invention.
2 is a cross-sectional view taken along the line II of FIG.
FIG. 3 is an exploded perspective view of the main part, similarly.
FIG. 4 is an explanatory view showing a main part of a conventional automobile power unit support structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Front body structure 11 Side frame 15 Front cross member 21 Suspension cross member 24 Center member attaching part 27 Center member 28 Front engine mount 30 Rear engine mount (engine mount)
31 mount bracket 31a base end 31b front end 31d insertion hole 33 power unit side bracket 33a base end 33b front end 35 cylindrical bush (buffer member)
35a outer cylinder 35b inner cylinder 35c elastic material 37 bolt (supporting shaft)
41 Power unit G Center of gravity of power unit

Claims (7)

A front cross member (15) installed between the left and right side frames (11) extending in the longitudinal direction of the vehicle body, and installed between the side frames (11) behind the front cross member (15). A suspension cross member (21) and a center member (27) installed between the front cross member (15) and the suspension cross member (21) are provided, and an engine mount ( 30) in the power unit support structure of an automobile that supports the power unit (41) via
The engine mount (30)
A power unit side bracket (33) whose base end is attached and supported by the power unit (41);
A buffer member (35) coupled to the tip of the power unit side bracket (33);
Includes a mount bracket (31) to the vertical load is supported by compression and tension direction from the cushioning member (35) to the distal end portion is coupled with upper Symbol power unit bracket (33),
A base end portion of the mount bracket (31) is attached and supported to a joint portion between the center member (27) and the suspension cross member (21) on the top surface of the suspension cross member (21). A power unit support structure for an automobile , wherein the buffer member (35) is arranged so as to be polymerized visually . A front cross member (15) installed between the left and right side frames (11) extending in the longitudinal direction of the vehicle body, and installed between the side frames (11) behind the front cross member (15). A suspension cross member (21) and a center member (27) installed between the front cross member (15) and the suspension cross member (21) are provided, and the power unit (41) is connected to a pair of front engine mounts. In the automotive power unit support structure, which is supported on the left and right side frames (11) via (28) and supported on the suspension cross member (21) via the rear engine mount (30),
The rear engine mount (30)
A power unit side bracket (33) whose base is attached and supported by the power unit (41);
A buffer member (35) coupled to the tip of the power unit side bracket (33);
Includes a mount bracket (31) to the vertical load is supported by compression and tension direction from the tip portion is coupled on SL power unit bracket (33) to the buffer member (35),
A base end portion of the mount bracket (31) is attached and supported to a joint portion between the center member (27) and the suspension cross member (21) on the top surface of the suspension cross member (21). A power unit support structure for an automobile , wherein the buffer member (35) is arranged so as to be polymerized visually .   Front engine mounts (28) are disposed on the left and right side frames (11), respectively, and the center of gravity (G) of the power unit (41) is located in the vicinity of the axis connecting the front engine mounts (28). The power unit support structure for an automobile according to claim 2, wherein a power unit (41) is installed between the left and right side frames (11) via the front engine mounts (28). The suspension cross member (41)
One of claims 1 to 3, characterized in that the center member mounting portion for supporting the base end portion of the mounting bracket (31) together with the center member (27) is coupled (24) is protruded 1 The power unit support structure for automobiles according to the item . A power unit side bracket (33) whose base end is attached and supported to the power unit (41) extends toward the rear of the vehicle body, the mount bracket (31) extends in the vertical direction, and the base end portion is a suspension cross member. The automotive power unit support structure according to any one of claims 1 to 4, wherein the power unit support structure is mounted and supported by (33) and the front end portion is coupled to the front end of the power unit side bracket via a buffer member. The buffer member (35)
An outer cylinder (35a);
An inner cylinder (35b) disposed in the outer cylinder (35a);
A cylindrical bush (35) provided with an elastic material (35c) interposed between the outer cylinder (35a) and the inner cylinder (35b),
An outer cylinder (35a) is coupled to the tip of the power unit side bracket (33), and the inner cylinder (35b) is connected to the tip of the mount bracket (31) by a locking shaft (35c) inserted through the inner cylinder (35b). The power unit support structure for an automobile according to claim 5 , wherein the power unit support structure is for a vehicle. The mounting bracket (31)
The base end portion is mounted and supported on the upper surface of the suspension cross member (21), and the upper end portion is substantially U-shaped in cross section with the front side of the vehicle body accommodating the cylindrical bush (35) open. Item 7. A power unit support structure for an automobile according to Item 6 .

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