JP4360251B2 - Torque rod mounting structure - Google Patents

Description

  The present invention relates to a torque rod mounting structure for connecting a drive unit mounted on a vehicle to a vehicle body side.

In automobiles, the drive unit is mounted on the vehicle body via the engine mount to reduce the transmission of vibrations generated by the drive unit to the vehicle body side. In order to suppress the excessive movement displacement (swing) of the drive unit that occurs during acceleration, there is known one in which the upper part of the drive unit is connected to a dash panel via a torque rod (for example, Patent Documents). 1).
JP-A-62-273119 (first page, FIG. 2)

  However, in such a conventional torque rod mounting structure, the dash panel to which the torque rod is mounted is usually arranged in a state where the brake hydraulic pressure generating device is located in the vehicle rear portion of the drive unit and protrudes forward of the vehicle. Therefore, when the front part of the vehicle body is greatly deformed at the time of a frontal collision and the drive unit is displaced to the rear of the vehicle, this drive unit interferes with the brake hydraulic pressure generator, and the lower part of the dash panel is moved backward to the rear of the vehicle. There is a risk that the retracted portion may enter the cabin.

  Therefore, the present invention is a torque rod capable of preventing the drive unit from interfering with the brake fluid pressure generating device even when the drive unit is displaced rearward of the vehicle without adding other members by devising the arrangement of the torque rod. This provides a mounting structure.

In the present invention, the dash panel on the vehicle rear side of the drive unit mounted on the front compartment is provided with a brake fluid pressure generator substantially positioned behind the vehicle on the drive unit, and the drive unit and the dash panel are provided. In a vehicle equipped with a torque rod that connects
The vehicle body side mounting portion provided at the vehicle body rear end portion of the torque rod is disposed at a position almost directly above the brake fluid pressure generating device, and the unit side mounting portion provided at the vehicle body front end portion of the torque rod is mounted on the vehicle body side mounting. The most important feature is that the torque rod is inclined downwardly upward, with the rear side of the vehicle being upward.

  According to the present invention, when the drive unit is displaced rearward due to a frontal collision of the vehicle, the rearward displacement force of the drive unit is input to a position almost directly above the brake fluid pressure generating device via the torque rod inclined rearward. Therefore, the dash panel is pushed and deformed obliquely upward in the upper part of the brake fluid pressure generating device, and the front protruding portion of the brake fluid pressure generating device is moved upward.

  On the other hand, the drive unit that is displaced to the rear of the vehicle has a rearwardly raised torque rod serving as a tension rod that is displaced downward as the drive unit moves rearward. The brake fluid pressure generating device and the drive unit are displaced away from each other in the vertical direction in combination with the movement of the portion upward, so that the drive unit interferes with the forward projecting portion of the brake fluid pressure generating device. This can prevent the dash panel from entering the cabin.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  1 to 3 show an embodiment of a torque rod mounting structure according to the present invention, FIG. 1 is a side view showing a torque rod mounting state, and FIG. 2 is an exploded perspective view of a mounting portion of the torque rod on the vehicle body side. FIG. 3 is a side view showing the operating state of the torque rod at the time of a frontal collision.

  As shown in FIG. 1, the torque rod mounting structure according to the present embodiment is arranged on the dash panel 2 at the rear of the power unit 1 as a drive unit mounted on the front compartment and is positioned substantially behind the vehicle at the rear of the power unit 1. A pressure generator 3 is provided, and the power unit 1 and the dash panel 2 are connected by a torque rod 10.

  The power unit 1 is mounted on a side member in an engine room E through an engine mount (not shown) in which an engine and a transmission are integrally coupled.

  The dash panel 2 divides the engine room E and the cabin C, and the brake fluid pressure generating device 3 is installed on the upper side of the dash lower 2a constituting the lower part of the dash panel 2 and constitutes the upper part. The dash upper 2b forms a closed cross-section S between the cowl top 4a joined to the upper side of the dash upper 2b to constitute the cowl 4.

  Further, an extension cowl top 4b bent in a substantially L-shaped cross section is joined to an upper flange portion 2c in which a dash upper 2b is extended from the lower front portion of the cowl portion 4 toward the front of the vehicle.

  The brake fluid pressure generating device 3 is composed of a circular master back 3a fixed to the dash panel 2 and a master cylinder 3b that is arranged to project forward from the center of the master back 3a. The pedal force of the pedal is boosted by the master back 3a to operate the master cylinder 3b, and the brake fluid pressure is generated by the master cylinder 3b.

  The torque rod 10 is offset from the master cylinder 3b in the vehicle width direction in a plan view and arranged in the vehicle front-rear direction. The vehicle body side insulator as a vehicle body side mounting portion provided at the vehicle body rear end portion of the torque rod 10 11 is disposed almost directly above the master back 3a, and a unit-side insulator 12 as a unit-side mounting portion provided at the front end of the vehicle body of the torque rod 10 is disposed below the vehicle-side insulator 11. The torque rod 10 is inclined rearward and upward with the rear of the vehicle being upward.

  The vehicle body side insulator 11 is attached to a dash panel 2 that is an upper part of the master back 3a via a mounting bracket 13, and particularly in this embodiment, at the upper end of the dash lower 2a as shown in FIG. An upper side 13a of the mounting bracket 13 is joined between the formed lower flange portion 2d and the upper flange portion 2c of the dash upper 2b.

  The bottom surface 4c of the extension cowl top 4b is formed with a work hole 4e for inserting and tightening the mounting bolt 11a of the vehicle body side insulator 11 in the upper part of the mounting bracket 13, and this working hole 4e The grommet 14 is fitted and sealed after the mounting bolt 11a is mounted.

  Further, as shown in FIG. 1, the unit side insulator 12 of the torque rod 10 is on the arc A centering on the roll center G that is the center of swinging of the power unit 1 and in front of the roll center G (in the figure). And the vehicle body side insulator 11 of the torque rod 10 on a straight line L passing through the center of the unit side insulator 12 and in contact with the arc A centering on the roll center G. The upper portion of the master back 3a is disposed so as to be rotatable in the vehicle width direction.

  According to the torque rod mounting structure of the present embodiment having the above configuration, when the power unit 1 is displaced rearward (leftward in the figure) due to a frontal collision of the vehicle, the rearward displacement force of the power unit 1 rises rearward. An input is made at a position almost directly above the master back 3a of the dash panel 2 through the inclined torque rod 10.

  Therefore, as shown in FIG. 3, since the dash panel 2 is deformed by being pushed obliquely upward at the upper portion of the master back 3a, the master cylinder 3b protruding from the center of the master back 3a is moved upward.

  In particular, in this embodiment, the mounting bracket 13 of the vehicle body side insulator 11 is joined to the lower flange portion 2d provided at the upper end portion of the dash panel 2, so that the lower flange portion 2d reliably receives the load from the front as a shearing load. Therefore, the master cylinder 3b can be reliably moved upward.

  On the other hand, the power unit 1 that is displaced rearward of the vehicle is displaced downward as indicated by an arrow K in FIG.

  Therefore, when the front cylinder collides, the master cylinder 3b moves upward and the power unit 1 is displaced downward, so that the master cylinder 3b and the power unit 1 are displaced away from each other in the vertical direction. Interference with 3b can be prevented, and as a result, the dash panel 2 can be prevented from entering the cabin c.

  Further, in the present embodiment, the unit-side insulator 12 of the torque rod 10 is disposed on the front side of the vehicle with respect to the roll center G on the arc A centering on the roll center G serving as the swing center of the power unit 1, and torque Since the vehicle body side insulator 11 of the rod 10 is arranged above the master back 3a on the straight line L passing through the unit side insulator 12 and contacting the arc A centered on the roll center G, the torque rod 10 is originally provided. It is possible to place the torque rod 10 in a rear-up position without impairing the function, that is, the function of displacing the master cylinder 3b and the power unit 1 away from each other in the vertical direction at the time of a frontal collision while regulating the swing of the power unit 1. It becomes.

  By the way, the torque rod mounting structure of the present invention has been described by taking the above embodiment as an example. However, the present invention is not limited to this embodiment, and various other embodiments can be adopted without departing from the gist of the present invention. .

It is a side view which shows the attachment state of the torque rod in one Embodiment of this invention. It is a disassembled perspective view of the attachment part to the vehicle body side of the torque rod in one Embodiment of this invention. It is a side view which shows the operating state of the torque rod at the time of front collision in one Embodiment of this invention.

Explanation of symbols

1 Power unit (drive unit)
2 dash panel 3 brake fluid pressure generator 3a master back 3b master cylinder 10 torque rod 11 vehicle body side insulator (vehicle body side mounting portion)
12 Unit side insulator (Unit side mounting part)

Claims (2)

A dash panel on the rear side of the drive unit mounted on the front compartment is provided with a brake fluid pressure generator substantially positioned behind the drive unit, and a torque rod for connecting the drive unit and the dash panel is provided. In the equipped vehicle,
The vehicle body side mounting portion provided at the vehicle body rear end portion of the torque rod is disposed at a position almost directly above the brake fluid pressure generating device, and the unit side mounting portion provided at the vehicle body front end portion of the torque rod is mounted on the vehicle body side mounting. A torque rod mounting structure, characterized in that the torque rod is inclined downwardly upward, with the rear side of the vehicle being upward.   The torque rod unit side mounting portion is disposed on the front side of the vehicle with respect to the arc centering on the roll center that is the center of oscillation of the drive unit, and the vehicle body side mounting portion of the torque rod is disposed on the unit. 2. The torque rod mounting structure according to claim 1, wherein the torque rod mounting structure is disposed above the brake hydraulic pressure generator on a straight line passing through a side mounting portion and contacting a circular arc centered on the roll center.

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