Power unit mounting structure

Abstract

To provide a power unit mounting structure that improves the ease of assembly of the vehicle body-side bracket to the vehicle body, in a configuration where the unit-side bracket and the vehicle body-side bracket constituting the mounting bracket are pre-integrated as a sub-assembly via a mounting insulator. [Solution] The vehicle body bracket 12 has a main body portion 13 to which the mount insulator 20 is attached, a side member mounting portion 14 that extends from the lower part of the main body portion 13 along the upper surface of the side member 2 and is fastened to the side member 2, and an apron panel mounting portion 15 that extends from the upper part of the main body portion 13 toward the apron panel 5 and is attached to the base member 6. The dimensions and weight of the apron panel mounting portion 15 are set to prevent the vehicle body bracket 12 from falling toward the unit side bracket 11 when the side member mounting portion 14 is temporarily placed on the side member 2.

Description

Technical Field

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[0001] The present invention relates to a mounting structure of a power unit.

Background Art

[0002] The engine mounting device described in Patent Document 1 includes a mount insulator fixed to a vehicle body side member via an elastic body between an outer cylinder and an inner cylinder, an engine unit mounting portion fixed to the engine side by a pin portion inserted into the inner cylinder, and a stay interposed between the outer peripheral portion of the outer cylinder and the vehicle body side member to connect the two.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the technology described in Patent Document 1, when attaching the outer cylinder of the mount insulator to the inclined surface of an apron panel joined to the outside of the side member, the inclination of the vehicle body side bracket may cause a large deviation in the fastening angle between the two, and the assemblability of the vehicle body side bracket may deteriorate. That is, when the vehicle body side bracket of this sub-assembly, in which the vehicle body side bracket and the unit side bracket are pre-connected via a mount insulator, is temporarily placed on the vehicle body, if the weight of the unit side bracket is greater than that of the vehicle body side bracket, the vehicle body side bracket may fall toward the unit side bracket, and the assemblability of the vehicle body side bracket may deteriorate.

[0005] The present invention has been made in view of the above circumstances, and aims to provide a power unit mounting structure that can improve the ease of assembly of the vehicle body-side bracket to the vehicle body in a configuration in which the unit-side bracket and the vehicle body-side bracket constituting the mounting bracket are pre-integrated as a sub-assembly via a mounting insulator. [Means for solving the problem]

[0006] The present invention relates to a mounting structure for a power unit mounted on a vehicle comprising: a power unit housed in an engine compartment; a side member extending in the longitudinal direction of the vehicle from the vehicle width end of the engine compartment; and an apron panel extending diagonally upward from the outer part of the side member, wherein the mounting structure includes a mounting bracket that supports the vehicle width end of the power unit on the side member, and the mounting bracket comprises a base member having a horizontal upper end surface fixed to the apron panel at a position above the side member, and the mounting bracket comprises a unit-side bracket connected to the power unit on one side in the vehicle width direction, a vehicle-side bracket connected to the side member and the apron panel on the other side in the vehicle width direction, and a mounting bracket attached to the vehicle-side bracket, and the unit-side bracket The unit-side bracket and the vehicle-side bracket constitute a subassembly comprising an elastically supporting mount insulator, wherein the unit-side bracket and the vehicle-side bracket are pre-connected via the mount insulator, and the vehicle-side bracket has a main body portion to which the mount insulator is attached, a side member mounting portion extending from the lower part of the main body portion along the upper surface of the side member and fastened to the side member, and an apron panel mounting portion extending from the upper part of the main body portion toward the apron panel and attached to the base member, wherein the dimensions and weight of the apron panel mounting portion are set to prevent the vehicle-side bracket from tipping toward the unit-side bracket when the side member mounting portion is temporarily placed on the side member. [Effects of the Invention]

[0007] As described above, according to the present invention, in a configuration in which the unit-side bracket and the vehicle-side bracket constituting the mount bracket are pre-integrated as a sub-assembly via a mount insulator, it is possible to provide a power unit mounting structure that can improve the ease of assembly of the vehicle-side bracket to the vehicle body. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a perspective view showing a vehicle-mounted state of a mounting bracket according to one embodiment of the present invention. [Figure 2] Figure 2 is a front view showing a vehicle-mounted state of a mounting bracket according to one embodiment of the present invention. [Figure 3] Figure 3 is a plan view of the vehicle body side bracket of a mounting bracket according to one embodiment of the present invention. [Figure 4] Figure 4 is a left side view of the vehicle body side bracket of a mounting bracket according to one embodiment of the present invention. [Figure 5] Figure 5 is a perspective view of the vehicle body-side bracket of a mounting bracket according to one embodiment of the present invention, viewed from the lower left front. [Modes for carrying out the invention]

[0009] A power unit mounting structure according to one embodiment of the present invention is mounted on a vehicle that includes a power unit housed in an engine compartment, a side member extending in the longitudinal direction of the vehicle at the end of the engine compartment in the vehicle width direction, and an apron panel extending diagonally upward from the outer part of the side member, and includes a mounting bracket that supports the end of the power unit in the vehicle width direction on the side member, wherein a base member having a horizontal upper end surface is fixed to the apron panel at a position above the side member, and the mounting bracket includes a unit-side bracket connected to the power unit on one side in the vehicle width direction, a vehicle-side bracket connected to the side member and the apron panel on the other side in the vehicle width direction, and the vehicle-side bracket The power unit mounting structure according to one embodiment of the present invention is characterized in that, in a configuration in which the unit-side bracket and the vehicle-side bracket are pre-connected via the mount insulator, the vehicle-side bracket has a main body to which the mount insulator is attached, a side member mounting portion extending from the lower part of the main body along the upper surface of the side member and fastened to the side member, and an apron panel mounting portion extending from the upper part of the main body toward the apron panel and attached to a base member, the dimensions and weight of the apron panel mounting portion are set to prevent the vehicle-side bracket from falling toward the unit-side bracket when the side member mounting portion is temporarily placed on the side member. [Examples]

[0010] The following describes a power unit mounting structure according to one embodiment of the present invention with reference to the drawings. Figures 1 to 5 show the power unit mounting structure according to one embodiment of the present invention. In Figures 1 to 5, the up, down, front, rear, left, and right directions are defined as the front-rear direction of the vehicle, the left-right direction of the vehicle (vehicle width direction), and the up and down direction of the vehicle (vehicle height direction).

[0011] First, let's explain the configuration. In Figures 1 and 2, the vehicle 1 comprises a power unit 4 housed in an engine compartment 3, a side member 2 extending in the front-rear direction of the vehicle from the vehicle width end of the engine compartment 3, and an apron panel 5 extending diagonally upward from the outer part of the side member 2.

[0012] The power unit 4 constitutes the power source for driving and consists of a transaxle that integrates the engine and transmission, or a motor for driving. The side members 2 extend in the longitudinal direction of the vehicle at the left and right ends of the engine room 3 in the vehicle width direction. Figures 1 and 2 show the side member 2 at the left end of the engine room 3. The side members 2 and the apron panel 5 constitute the vehicle body in this invention.

[0013] Vehicle 1 is equipped with a mounting bracket 10 that supports the left end of the power unit 4 in the vehicle width direction on the side member 2.

[0014] A base member 6 having a horizontal upper end surface is fixed to the apron panel 5 at a position above the side member 2. A bolt 7 is fixed to the upper end surface of the base member 6, and this bolt 7 extends upward from the upper end surface of the base member 6.

[0015] The mounting bracket 10 comprises a unit-side bracket 11 connected to the power unit 4 on one side (right side) in the vehicle width direction, a vehicle body-side bracket 12 connected to the side member 2 and apron panel 5 on the other side (left side) in the vehicle width direction, and a mounting insulator 20 attached to the vehicle body-side bracket 12 and elastically supporting the unit-side bracket 11.

[0016] As shown in FIG. 4, the mount insulator 20 has a cylindrical outer cylinder 21, a cylindrical inner cylinder 22 coaxially arranged inside the outer cylinder 21, and a mount rubber 23 as an elastic body arranged between the outer cylinder 21 and the inner cylinder 22.

[0017] As shown in FIGS. 1 and 4, the unit-side bracket 11 has a power unit fixing portion 11A fixed to the power unit 4 and a mount insulator fixing portion 11B fixed to the inner cylinder 22 of the mount insulator 20.

[0018] The mount insulator fixing portion 11B extends rightward from the mount insulator 20. The power unit fixing portion 11A extends downward from the right end portion of the mount insulator fixing portion 11B and is fixed to the power unit 4 at the lower end portion.

[0019] In FIGS. 1 and 2, the unit-side bracket 11 and the vehicle body-side bracket 12 are pre-integrated as a sub-assembly via the mount insulator 20. That is, the mount bracket 10 is manufactured as a sub-assembly in which the unit-side bracket 11, the mount insulator 20, and the vehicle body-side bracket 12 are pre-connected, and is assembled to the vehicle 1 in the state of the sub-assembly. Then, the power unit 4 is attached to the mount bracket 10 assembled to the vehicle 1.

[0020] The vehicle body-side bracket 12 has a main body portion 13 to which the mount insulator 20 is attached, a side member attachment portion 14 that extends from the lower portion of the main body portion 13 along the upper surface of the side member 2 and is fastened to the side member 2, and an apron panel attachment portion 15 that extends from the upper portion of the main body portion 13 in the direction of the apron panel 5 and is attached to the pedestal member 6.

[0021] The main body portion 13, the side member mounting portion 14, and the apron panel mounting portion 15 that constitute the vehicle body side bracket 12 are integrally formed by casting. A circular mount insulator mounting hole 13A is formed in the main body portion 13, and the outer cylinder 21 of the mount insulator 20 is fixed to the mount insulator mounting hole 13A.

[0022] The side member mounting portion 14 extends forward and backward along the upper surface of the side member 2. A bolt hole 14A is formed in the side member mounting portion 14. The side member mounting portion 14 is fixed to the side member 2 by a bolt 9 inserted through the bolt hole 14A.

[0023] The apron panel mounting portion 15 extends leftward from the upper part of the main body portion 13. A bolt hole 15A is formed at the left end of the apron panel mounting portion 15, and the bolt 7 of the pedestal member 6 is inserted through the bolt hole 15A.

[0024] The apron panel mounting portion 15 is attached to the pedestal member 6 by fastening a nut 8 to the bolt 7. The diameter of the bolt hole 15A is made larger than the diameter of the bolt 7 so that the bolt 7 can be easily inserted through.

[0025] Here, the assembly operation of the mount bracket 10 to the vehicle 1 is performed by attaching the apron panel mounting portion 15 to the pedestal member 6 with the nut 8 in a state where the side member mounting portion 14 of the vehicle body side bracket 12 is temporarily placed on the side member 2, and then attaching the side member mounting portion 14 to the side member 2 with the bolt 9.

[0026] In a state where the mount bracket 10 is temporarily placed, if there is a bias in the weight balance in the vehicle width direction of the mount bracket 10, the mount bracket 10 may fall to the power unit 4 side (left side).

[0027] In other words, if the unit-side bracket 11 of the mount bracket 10 is heavier than the vehicle-side bracket 12, or if the length of the unit-side bracket 11 in the vehicle width direction is longer than that of the vehicle-side bracket 12, the center of gravity of the mount bracket 10 will be located on the unit-side bracket 11, causing the mount bracket 10 to tilt towards the power unit 4. Tilting of the mount bracket 10 means that the mount bracket 10 is unable to stand on its own and tilts.

[0028] Furthermore, when the mount bracket 10 is temporarily placed, the bolts 7 of the base member 6 are inserted through the bolt holes 15A of the apron panel mounting portion 15. However, because the diameter of the bolt holes 15A is larger than the diameter of the bolts 7 to allow for easy insertion, the mount bracket 10 tilts towards the power unit 4 by the amount of this dimensional difference.

[0029] More specifically, as shown in Figure 2, the unit-side bracket 11 is subjected to a downward force W1 as indicated by arrow A, and the apron panel mounting portion 15 is subjected to a downward force W2 as indicated by arrow C. Therefore, if the force W1 is greater than the force W2, the mounting bracket 10 will tilt toward the power unit 4 side (to the right) due to the rotational moment in the direction indicated by arrow C. For this reason, it is desirable to set the weight balance of the mounting bracket 10 in the vehicle width direction so that the mounting bracket 10 does not tilt toward the power unit 4 side.

[0030] Therefore, in this embodiment, the dimensions and weight of the apron panel mounting portion 15 are set to prevent the vehicle body side bracket 12 from tipping over toward the unit side bracket 11 when the side member mounting portion 14 is temporarily placed on the side member 2. The dimensions of the apron panel mounting portion 15 refer to at least one of the dimensions (length) in the front-rear direction or the dimensions (length) in the vehicle width direction.

[0031] The dimensions and weight of the apron panel mounting portion 15 are set so that the center of gravity CG of the mount bracket 10 is located on the center line L in the vehicle width direction of the main body portion 13 and the side member mounting portion 14, or slightly to the left of this center line L towards the apron panel mounting portion 15. If the mount bracket 10 attempts to tip over towards the apron panel mounting portion 15 (to the right), the apron panel mounting portion 15 is supported by the upper end surface of the base member 6 of the apron panel 5, thus preventing it from tipping over.

[0032] As shown in Figure 3, the apron panel mounting portion 15 is formed in a rectangular shape when viewed from above the vehicle. A rectangle is defined as a rectangular shape.

[0033] As shown in Figure 4, the apron panel mounting portion 15 is formed such that its dimension in the vehicle's longitudinal direction is more than half the diameter of the mount insulator 20. In other words, if the dimension of the apron panel mounting portion 15 in the vehicle's longitudinal direction is W and the diameter of the mount insulator 20 is D, then W > D / 2 holds true.

[0034] As shown in Figure 1, the apron panel mounting section 15 is fixed to the base member 6 at multiple fastening points. Specifically, the apron panel mounting section 15 is fixed to the base member 6 at two fastening points by fastening bolts 7 and nuts 8.

[0035] As shown in Figures 4 and 5, the apron panel mounting portion 15 has thickened portions 15B extending in the vertical direction on the front and rear sides in the vehicle's longitudinal direction. The thickened portions 15B are formed on the front and rear sides near the main body portion 13 on the lower surface of the apron panel mounting portion 15, respectively.

[0036] As described above, in this embodiment, a base member 6 having a horizontal upper end surface is fixed to the apron panel 5 at a position above the side member 2. The mount bracket 10 comprises a unit-side bracket 11 connected to the power unit 4 on one side in the vehicle width direction, a vehicle-side bracket 12 connected to the side member 2 and the apron panel 5 on the other side in the vehicle width direction, and a mount insulator 20 attached to the vehicle-side bracket 12 and elastically supporting the unit-side bracket 11. The unit-side bracket 11 and the vehicle-side bracket 12 are pre-integrated as a subassembly via the mount insulator 20. The vehicle-side bracket 12 also has a main body portion 13 to which the mount insulator 20 is attached, a side member mounting portion 14 extending from the lower part of the main body portion 13 along the upper surface of the side member 2 and fastened to the side member 2, and an apron panel mounting portion 15 extending from the upper part of the main body portion 13 toward the apron panel 5 and attached to the base member 6. Furthermore, the dimensions and weight of the apron panel mounting portion 15 are set to prevent the vehicle body side bracket 12 from tipping over toward the unit side bracket 11 when the side member mounting portion 14 is temporarily placed on the side member 2.

[0037] As a result, in a structure configured as a sub-assembly pre-connected via the vehicle body bracket 12, the unit-side bracket 11, and the mount insulator 20, the dimensions and weight of the apron panel mounting portion 15 are set to prevent the vehicle body bracket 12 from tilting toward the unit-side bracket 11. Therefore, when the side member mounting portion 14 is temporarily placed on the side member 2, the vehicle body bracket 12 is prevented from tilting toward the unit-side bracket 11. In addition, by having the apron panel mounting portion 15 abut against the horizontal upper end surface of the base member 6, the misalignment between the base member 6 and the apron panel mounting portion 15 can be reduced, making it easier to position the vehicle body bracket 12. Thus, the ease of assembling the mount bracket 10 to the vehicle body can be improved.

[0038] As a result, in a configuration where the unit-side bracket 11 and the vehicle-side bracket 12 constituting the mount bracket 10 are pre-integrated as a sub-assembly via the mount insulator 20, the ease of assembly of the vehicle-side bracket 12 to the vehicle body can be improved.

[0039] Furthermore, in this embodiment, the main body portion 13, the side member mounting portion 14, and the apron panel mounting portion 15 are integrally formed by casting.

[0040] This makes it easy to adjust the dimensions and weight of the apron panel mounting portion 15 on the vehicle body bracket 12.

[0041] Furthermore, in this embodiment, the apron panel mounting portion 15 is formed in a rectangular shape when viewed from above the vehicle, and its dimensions in the vehicle's longitudinal direction are formed to be more than half the diameter of the mount insulator 20.

[0042] This ensures that the apron panel mounting section 15 has sufficient weight to prevent the vehicle body-side bracket 12 from tipping over towards the unit-side bracket 11.

[0043] In this embodiment, the apron panel mounting portion 15 is fixed to the base member 6 at multiple fastening points.

[0044] This allows the load from the increased weight of the apron panel mounting section 15 to be distributed among multiple fastening points, thereby suppressing vibrations of the apron panel mounting section 15.

[0045] Furthermore, in this embodiment, the apron panel mounting portion 15 has thickened portions 15B extending in the vertical direction on the front and rear sides in the vehicle's longitudinal direction.

[0046] As a result, when the weight of the apron panel mounting portion 15 increases, the presence of a thickened portion 15B that extends in the vertical direction can suppress vibrations of the apron panel mounting portion 15 in the vehicle's vertical direction.

[0047] While embodiments of the present invention have been disclosed, it will be apparent to those skilled in the art that modifications can be made without departing from the scope of the invention. All such modifications and equivalents are intended to be included in the following claims. [Explanation of Symbols]

[0048] 1 vehicle 2 Side Members 3. Engine Room 4 Power Unit 5 Apron Panel 6. Base component 7 bolts (fastening points) 8. Nut (fastening point) 10 Mounting Brackets 11 Unit-side bracket 12. Vehicle-side bracket 13 Main body 14 Side member mounting section 15 Apron panel mounting section 15B Thick part 20 Mounting Insulators

Claims

1. It is mounted on a vehicle that includes a power unit housed in an engine compartment, a side member extending in the longitudinal direction of the vehicle at the vehicle width end of the engine compartment, and an apron panel extending diagonally upward from the outer part of the side member. A mounting structure for a power unit comprising a mounting bracket that supports the end of the power unit in the vehicle width direction on the side member, A base member having a horizontal upper end surface is fixed to the apron panel at a position above the side member. The aforementioned mounting bracket is A unit-side bracket connected to the power unit on one side in the vehicle width direction, A vehicle body bracket connected to the side member and the apron panel on the other side in the vehicle width direction, The system includes a mount insulator that is attached to the vehicle body side bracket and elastically supports the unit side bracket, The unit-side bracket and the vehicle body-side bracket constitute a sub-assembly that is pre-connected via the mount insulator. The aforementioned vehicle body side bracket is It comprises a main body portion to which the mount insulator is attached, a side member mounting portion extending from the lower part of the main body portion along the upper surface of the side member and fastened to the side member, and an apron panel mounting portion extending from the upper part of the main body portion toward the apron panel and attached to the base member, A power unit mounting structure characterized in that the dimensions and weight of the apron panel mounting portion are set so as to prevent the vehicle body side bracket from falling toward the unit side bracket when the side member mounting portion is temporarily placed on the side member.

2. The mounting structure for a power unit according to claim 1, characterized in that the main body portion, the side member mounting portion, and the apron panel mounting portion are integrally formed by casting.

3. The mounting structure for a power unit according to claim 2, characterized in that the apron panel mounting portion is formed in a rectangular shape in a plan view of the vehicle, and its dimensions in the front-rear direction of the vehicle are formed to be more than half the diameter of the mount insulator.

4. The mounting structure for the power unit according to claim 3, characterized in that the apron panel mounting portion is fixed to the base member at a plurality of fastening points.

5. The mounting structure for the power unit according to claim 3, characterized in that the apron panel mounting portion has a thick portion extending in the vertical direction on the front and rear sides in the vehicle's longitudinal direction.

Images