JP2017024463A - Coupling structure of power unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coupling structure of a power unit capable of preventing the deterioration of fastening force of a fastening member, and easily improving the workability of work for attaching a torque rod to the power unit.SOLUTION: In a coupling structure of a power unit 3 having a torque rod 10, a unit side coupling portion 12 of the torque rod 10 is equipped with: an inner cylinder portion 12A having a screw hole; an outer cylinder portion 12C coupled to an outer peripheral portion of the inner cylinder portion 12A through an elastic body; and a bolt 15 which is inserted in a screw hole of the inner cylinder portion 12A to fasten the inner cylinder portion 12A to the power unit 3. The inner cylinder portion 12A is formed so as to make an insertion direction of the bolt 15 become the same direction as an extending direction of a rod-shaped portion 13.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a power unit connection structure, and more particularly to a power unit connection structure including a torque rod that elastically connects a power unit and a vehicle body.

  In vehicles such as automobiles, both ends of a power unit consisting of an internal combustion engine and a transmission are supported on the vehicle body by a mount member, and in order to prevent the power unit from swinging around a torque roll shaft connecting the mount member, A power unit connection structure in which a power unit and a vehicle body are connected by a torque rod in a direction orthogonal to the torque roll axis is known.

  As a torque rod used for the connection structure of this power unit, what was described in patent document 1 is known, for example. The torque rod includes a vehicle body side vibration isolation bush attached to the vehicle body, a power unit side vibration isolation bush attached to the power unit, and a flange portion connecting the vehicle body side vibration isolation bush and the power unit side vibration isolation bush. Yes.

  The vehicle body side vibration isolating bush includes a vehicle body side inner cylinder portion that is attached to the vehicle body by bolts and nuts, and a vehicle body side outer cylinder portion that is connected to an outer peripheral portion of the vehicle body side inner cylinder via a vehicle body side elastic member. . The power unit side anti-vibration bush includes a power unit side inner cylinder part that is attached to the vehicle body by bolts and nuts, and a power unit side outer cylinder part that is connected to the outer peripheral part of the power unit side inner cylinder part via a power unit side elastic member. The bolt is fastened to the power unit side inner cylinder from the same direction as the torque roll shaft.

JP 2014-65443 A

  In such a conventional power unit connection structure, since the bolt is fastened to the power unit side inner cylinder portion from the same direction as the torque roll shaft, the rotation direction of the bolt and the swinging direction of the power unit are the same direction. Thereby, there exists a possibility that the fastening force of a fastening member may fall.

  Further, when attaching the power unit side anti-vibration bush of the torque rod to the power unit, the workability of aligning the positions of the bolt insertion holes provided in the power unit and the bolt insertion holes of the power unit side inner cylinder portion is reduced.

  That is, when the position of the bolt insertion hole provided in the power unit and the bolt insertion hole of the power unit side inner cylinder part is shifted in the swinging direction of the power unit, swing the power unit using a dedicated jig. After positioning the bolt insertion hole provided in the power unit and the bolt insertion hole of the power unit side inner cylinder part, it is necessary to connect the power unit side vibration isolating bush to the power unit in a state where the power unit is fixed. For this reason, workability | operativity of the operation | work which attaches a torque rod to a power unit will fall.

  The present invention has been made paying attention to the above-mentioned problems, and can prevent the fastening force of the fastening member from being lowered and can easily improve the workability of attaching the torque rod to the power unit. It is an object to provide a connecting structure.

  The present invention relates to a power unit connecting structure in which a power unit is elastically connected to a vehicle body of a vehicle by a torque rod so as to suppress swinging of the power unit including an internal combustion engine around a torque roll shaft. A vehicle body side connecting portion elastically connected to the vehicle body, a unit side connecting portion elastically connected to the power unit, and a rod-like portion connecting the vehicle body side connecting portion and the unit side connecting portion, The connecting part is inserted into the inner cylinder part having the insertion hole, the outer cylinder part connected to the outer peripheral part of the inner cylinder part via an elastic body, and the insertion hole of the inner cylinder part, whereby the inner cylinder part is A fastening member fastened to the power unit, and the inner cylinder portion is formed such that the insertion direction of the fastening member is the same as the direction in which the rod-like portion extends.

  As described above, according to the present invention, the inner cylinder portion is formed so that the inserting direction of the fastening member is the same as the extending direction of the rod-like portion. And the rotation direction of the fastening member can be set in different directions. Thereby, it can prevent that the fastening force of a fastening member receives the load of the swing direction of a power unit, and falls.

  In addition, when connecting the power unit and the unit side connecting portion of the torque rod, the torque rod can be easily attached to the power unit by inserting the fastening member into the inner cylinder portion and tightening the fastening member. The workability of attaching the torque rod to the power unit can be easily improved.

FIG. 1 is a diagram showing an embodiment of a power unit connecting structure according to the present invention, and is a plan view of a front portion of a vehicle. 2 is a view showing an embodiment of the power unit connecting structure of the present invention, and is a cross-sectional view taken along the line II-II in FIG. FIG. 3 is a view showing an embodiment of the power unit connecting structure of the present invention, and is an enlarged view of the vicinity of the torque rod showing a state in which the torque rod is assembled in the section taken along the line II-II in FIG. . FIG. 4 is a diagram showing an embodiment of a power unit connecting structure according to the present invention, and is a plan view of a torque rod. FIG. 5 is a view showing an embodiment of the power unit connecting structure of the present invention, and is a cross-sectional view taken along the line V-V in FIG. 4.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a power unit connection structure according to the present invention will be described with reference to the drawings.
1-5 is a figure which shows the connection structure of the power unit of one Embodiment which concerns on this invention. 1-5, the up-down and left-right directions have shown the direction seen from the driver | operator who gets on a vehicle.

  First, the configuration will be described. In FIG. 1, a vehicle 1 has an engine room 2 on the front side, and a power unit 3 is mounted inside the engine room 2. The power unit 3 includes an engine 4 and a transmission 5 as an internal combustion engine.

  The engine 4 is composed of, for example, an in-line four-cylinder engine having four cylinders 4A, and is a horizontal engine in which a crankshaft (not shown) is arranged in the vehicle width direction. The transmission 5 is connected to one end of the engine 4 in the vehicle width direction, shifts the rotation of the crankshaft, and transmits the power of the shifted rotation speed to drive wheels (not shown).

  The vehicle 1 includes side frames 6L and 6R on both sides in the vehicle width direction, and the side frames 6L and 6R extend in the front-rear direction of the vehicle 1. Mount members 7L and 7R are provided at one end 3a and the other end 3b in the vehicle width direction of the power unit 3, and the mount members 7L and 7R are elastically supported by the side frames 6L and 6R, respectively.

The connection structure of the power unit 3 according to the present embodiment is supported by the side frames 6L and 6R so that the upper portions of the one end portion 3a and the other end portion 3b of the power unit 3 are suspended by the mount members 7L and 7R. Yes.
The vehicle 1 can suppress vibrations from being transmitted from the engine 4 to the side frames 6L and 6R by the mount members 7L and 7R. Thereby, NV (noise undulation) performance at the time of travel of vehicles 1 can be improved.

A suspension frame 8 is connected to the side frames 6L and 6R, and the suspension frame 8 includes an upper frame portion 8A and a lower frame portion 8B that are separated in the vertical direction and extend in the vehicle width direction (see FIG. 2). . The side frames 6L and 6R and the suspension frame 8 of the present embodiment constitute the vehicle body of the present invention.
Thus, since the power unit 3 is elastically supported by the side frames 6L and 6R at both ends in the vehicle width direction by the mount members 7L and 7R, when the vehicle 1 is started or stopped, the torque roll shaft (inertial main shaft) ) Try to swing around 9.

  As shown in FIG. 1, the torque roll shaft 9 extends in the vehicle width direction through the center of gravity of the power unit 3, and in the power unit 3 of the present embodiment, a line connecting the mount members 7L and 7R and the torque roll The axis 9 is collinear with the axis in the vehicle width direction orthogonal to the axis in the front-rear direction of the vehicle 1.

Therefore, in the power unit 3, one end 3a and the other end 3b in the direction of the torque roll shaft 9 are elastically connected to the side frames 6L and 6R by the mount members 7L and 7R.
However, it goes without saying that the torque roll shaft 9 is oriented in a direction orthogonal to or inclined with respect to the longitudinal axis of the vehicle 1 depending on the installation positions of the mount members 7L, 7R. Further, the direction orthogonal to the longitudinal axis of the vehicle 1 is not limited to 90 ° with respect to the longitudinal axis of the vehicle 1, and includes those tilted near 90 °.

  In FIG. 1 and FIG. 2, the power unit 3 and the suspension frame 8 are elastically connected by a torque rod 10 in order to suppress swinging of the power unit 3 around the torque roll shaft 9.

  2 to 5, the torque rod 10 includes a vehicle body side connecting portion 11, a unit side connecting portion 12, and a rod-like portion 13 that connects the vehicle body side connecting portion 11 and the unit side connecting portion 12. It is installed below the torque roll shaft 9 in the height direction of the vehicle 1.

  In FIG. 4, the vehicle body side connecting portion 11 includes an inner cylinder portion 11A and an outer cylinder portion 11C connected to an outer peripheral portion of the inner cylinder portion 11A via an elastic body 11B such as rubber. Bolt insertion holes 11a are formed in the inner cylinder portion 11A.

  In FIG. 2, the vehicle body side connecting portion 11 is formed in the inner cylinder portion 11A from a hole (not shown) formed in the lower frame portion 8B when inserted between the upper frame portion 8A and the lower frame portion 8B. The bolt 14A is inserted into a hole (not shown) formed in the upper frame portion 8A through the hole not to be inserted, and the bolt 14A is fastened to the nut 14B installed in the upper frame portion 8A, so that the suspension frame 8 is elastically connected. .

  In FIG. 5, the unit side connection part 12 is provided with 12 A of inner cylinder parts, and the outer cylinder part 12C connected with the outer peripheral part of 12 A of inner cylinder parts via elastic bodies 12B, such as rubber | gum. A screw hole 12a is formed in the end surface 12s of the inner cylinder part 12A, and the bolt 15 is inserted into the screw hole 12a and the screw 15a of the bolt 15 is fastened, whereby the bolt 15 is fastened to the inner cylinder part 12A. The The screw hole 12a of the present embodiment constitutes the insertion hole of the present invention.

  In FIG. 2, a bracket 16 is attached to the lower portion of the power unit 3 in the vehicle width direction central portion of the power unit 3, and a flat surface 16p that faces the end surface 12p of the inner cylinder portion 12A is formed on the bracket 16. A bolt insertion hole (not shown) for allowing the bolt 15 to pass therethrough is formed. When the bolt 15 is inserted into the inner cylinder part 12 </ b> A through the bolt hole of the bracket 16, the unit cylinder part 12 </ b> A is fastened to the power unit 3. Thereby, the unit side connection part 12 is elastically connected to the power unit 3.

  As described above, the power unit 3 is elastically connected to the suspension frame 8 by the torque rod 10, so that the power unit 3 is centered on the torque roll shaft 9 in the R direction (FIG. 2, FIG. 2) when the vehicle 1 is started or stopped. 3) can be suppressed.

  The rod-shaped portion 13 extends in the front-rear direction of the vehicle 1 and is installed on the same axis as the axis in the front-rear direction of the vehicle 1. That is, the rod-like portion 13 of the present embodiment extends in a direction orthogonal to the torque roll shaft 9, which is a direction different from the torque roll shaft 9.

  The central axis in the extending direction of the inner cylindrical portion 12A is provided on the same axis as the central axis in the extending direction of the rod-shaped portion 13. Accordingly, the inner cylinder portion 12A is formed such that the screw hole 12a extends in the front-rear direction of the vehicle 1 in which the insertion direction of the bolt 15 is the same as the direction in which the rod-shaped portion 13 extends. The bolt 15 of the present embodiment constitutes a fastening member of the present invention.

Next, the operation will be described.
In FIG. 3, the distance from the axial center axis X of the bolt insertion hole 11a (see FIG. 4) formed in the inner cylinder portion 11A of the torque rod 10 to the end surface 12p of the inner cylinder portion 12A is defined as a torque rod pitch L1.
Further, in the state before the unit side connecting portion 12 of the torque rod 10 is connected to the power unit 3, the axial center axis Y connecting the holes of the upper frame portion 8A and the lower frame portion 8B to which the torque rod 10 is attached. The distance from the flat surface 16p of the bracket 16 to the mounting portion pitch L2.
More specifically, the mounting portion pitch L2 is a temporarily assembled state in which the power unit 3 is elastically connected to the side frames 6L and 6R by the mount members 7L and 7R (before the power unit 3 is connected to the suspension frame 8 by the torque rod 10). Represents the mounting portion pitch.

  When connecting the unit side connecting portion 12 of the torque rod 10 to the power unit 3, the hole of the bracket 16 is formed from the front of the bracket 16 in a state where the vehicle body side connecting portion 11 is attached to the suspension frame 8 by the bolt 14 </ b> A and the nut 14 </ b> B. Then, the bolt 15 is inserted into the screw hole 12 a of the inner cylinder portion 12 </ b> A of the unit side connecting portion 12.

  In the state before the bolt 15 is inserted, when the hole of the bracket 16 is viewed from the front of the vehicle 1, even if the torque rod pitch L1 is shorter than the mounting pitch L2, the hole of the bracket 16 and the screw hole 12a are identical. Located on the line. Thereby, the bolt 15 can be easily inserted into the screw hole 12 a through the hole of the bracket 16.

  When the bolt 15 is tightened after the bolt 15 is inserted into the screw hole 12a, the power unit 3 swings around the torque roll shaft 9 as the bolt 15 is tightened, and the end face 12p of the inner cylinder portion 12A of the torque rod. The flat surface 16p of the bracket 16 is seated on.

  As a result, the suspension frame 8 and the power unit 3 are elastically connected via the torque rod 10 in a state where the power unit 3 has a normal inclination around the torque roll shaft 9.

Thus, according to the connection structure of the power unit 3 of the present embodiment, the screw hole 12a into which the bolt 15 is inserted is formed in the inner cylinder portion 12A of the unit side connection portion 12, and the insertion direction of the bolt 15 is the rod-shaped portion 13. The inner cylinder portion 12A was formed so as to be in the same direction as the extending direction of the.
Thereby, the swinging direction (R direction in FIG. 3) of the power unit 3 around the torque roll shaft 9 and the rotation direction of the bolt 15 can be set to different directions. Thereby, it can prevent that the fastening force of the volt | bolt 15 receives the load of the swing direction of the power unit 3, and falls.

  Further, according to the connecting structure of the power unit 3 of the present embodiment, when the power unit 3 and the unit side connecting portion 12 of the torque rod 10 are connected, the bolt 15 is fastened to the inner cylinder portion 12A as in the prior art. If the fastening hole axial direction of the power unit side fastening portion is the same direction as the torque roll shaft, and if there is a deviation around the torque roll shaft due to individual differences when the power unit 3 is mounted, the bolt insertion hole of the bracket Since it is displaced in the radial direction with respect to the fastening hole, it is difficult to fasten the bolt. In that case, a jig for fixing the power unit may be required for hole alignment.

 On the other hand, according to the connection structure of the power unit 3 of the present embodiment, the screw hole 12a of the inner cylinder portion 12A and the bolt insertion hole of the bracket 16 are located on the same axis as the central axis in the extending direction of the rod-like portion 13. Therefore, even if the power unit 3 is misaligned about the torque roll shaft 9 due to individual differences, the bolt insertion hole of the bracket 16 does not deviate in the radial direction of the screw hole 12a. The bolt 15 can be easily fastened. As a result, the workability of attaching the torque rod 10 to the power unit 3 can be easily improved.

  In particular, when it is desired to adjust the power unit 3 to an arbitrary inclination with the torque rod 10 attached to the power unit 3, when the torque rod pitch L1 is set to be shorter than the attachment portion pitch L2, the present embodiment According to the connecting structure of the power unit 3, the bolt insertion hole of the bracket 16 does not shift in the radial direction of the screw hole 12a even if there is a gap between the end surface 12p of the torque rod 10 and the flat surface 16p of the bracket. Can be assembled.

  Further, according to the connecting structure of the power unit 3 of the present embodiment, the one end 3a and the other end 3b of the power unit 3 in the direction of the torque roll shaft 9 are elastically connected to the suspension frame 8 by the mount members 7L and 7R. The rod-like portion 13 was extended in a direction different from the direction of the torque roll shaft 9.

  In particular, the power unit 3 of the present embodiment is mounted horizontally with respect to the side frames 5L and 5R so that the torque roll shaft 9 extends in the vehicle width direction, and the rod-shaped portion 13 extends in the front-rear direction of the vehicle 1. Are installed between the power unit 3 and the suspension frame 8. In addition to this, the screw hole 12a is extended in the same direction as the direction in which the rod-shaped portion 13 extends.

Thereby, the swing direction of the power unit 3 around the torque roll shaft 9 can be set differently from the rotation direction of the bolt 15, and the fastening force of the bolt 15 is reduced by receiving the load in the swing direction of the power unit 3. This can be prevented more effectively.
The connecting structure of the power unit 3 according to the present embodiment is such that the rod-like portion 13 extends in the front-rear direction of the vehicle 1, but the vehicle 1 can be used as long as it extends in a direction orthogonal to the direction of the torque roll shaft 9. It is not limited to what extends in the front-rear direction.

  While embodiments of the invention have been disclosed, it will be apparent to those skilled in the art that changes may be made without departing from the scope of the invention. All such modifications and equivalents are intended to be included in the following claims.

  1 ... vehicle, 3 ... power unit, 4 ... engine (internal combustion engine), 6L, 6R ... side frame (vehicle body), 7L, 7R ... mount member, 8 ... suspension frame ( Vehicle body), 9 ... torque roll shaft, 10 ... torque rod, 11 ... vehicle body side connecting portion, 12 ... unit side connecting portion, 12A ... inner cylinder portion, 12B ... elastic body , 12C ... outer cylinder part, 12a ... screw hole (insertion hole), 13 ... rod-like part, 15 ... bolt (fastening member)

Claims (3)

A power unit connection structure in which the power unit is elastically connected to a vehicle body of a vehicle by a torque rod so as to suppress swinging about a torque roll axis of the power unit including the internal combustion engine,
The torque rod connects the vehicle body side connecting portion elastically connected to the vehicle body, the unit side connecting portion elastically connected to the power unit, and the vehicle body side connecting portion and the unit side connecting portion. With a rod-shaped part,
The unit side connecting part is inserted into the inner cylinder part having an insertion hole, the outer cylinder part connected to the outer peripheral part of the inner cylinder part via an elastic body, and the insertion hole of the inner cylinder part. And a fastening member for fastening the inner cylinder part to the power unit,
The connecting structure for a power unit, wherein the inner cylinder portion is formed so that the insertion direction of the fastening member is the same as the direction in which the rod-shaped portion extends. One end and the other end of the power unit in the torque roll axial direction are elastically connected to the vehicle body by a mount member, respectively.
2. The power unit connection structure according to claim 1, wherein the rod-shaped portion extends in a direction different from the torque roll axial direction. The power unit is mounted horizontally with respect to the vehicle body so that the torque roll shaft extends in the vehicle width direction,
The rod-shaped portion is installed between the power unit and the vehicle body so as to extend in the front-rear direction of the vehicle,
The power unit connection structure according to claim 1, wherein the insertion hole extends in the same direction as the direction in which the rod-shaped portion extends.

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