JPH0612984Y2 - Engine exhaust pipe support structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an exhaust pipe support structure for an engine.

(Prior Art) For the exhaust pipe support structure of the engine, see Japanese Utility Model Laid-Open No. 56-1361.
As shown in Japanese Patent No. 23, a hanger member is attached to a vehicle body frame via an elastic member, and an exhaust pipe extending in the vehicle front-rear direction is fixed to the hanger member.

In such an exhaust pipe structure of the engine, the exhaust pipe is provided with a curved portion in front of the hanger member in the vehicle body,
As a result, the exhaust pipe can be arranged in the center of the vehicle body while avoiding interference with other components.

(Problems to be solved by the invention) However, in the above exhaust pipe support structure, when the vehicle collides head-on, the body frame, which is less likely to be deformed, moves backward relative to the vehicle body, while the exhaust pipe has a hanger member. Since it is supported by the vehicle body frame via the elastic member, an inertial force directed to the front of the vehicle body acts, and the exhaust pipe relatively moves toward the engine by the inertial force. Therefore, the impact force causes the curved portion of the exhaust pipe to be further curved so as to have a large curvature and is expanded outward of the curved portion of the curved portion. There is a risk of interference with the members.

The present invention has been made in view of the above circumstances, and an object thereof is to prevent interference between an exhaust pipe and other members at the time of a collision.

(Means and Actions for Solving Problems) In order to achieve the above object, in the present invention, a hanger member is attached to a vehicle body frame via an elastic member, and the hanger member is attached to the hanger member in the vehicle longitudinal direction. In an exhaust pipe support structure for an engine, in which an extending exhaust pipe is fixed, and the exhaust pipe has a curved portion in front of the hanger member in the vehicle body, a regulating member is fixed to the vehicle body frame, and the regulating member is It is configured such that it is located inside the bending portion of the bending portion, and is located only within the moving region of the hanger member based on the inertial force directed to the front of the vehicle body at the time of a collision. With the above configuration, when the vehicle collides head-on, the vehicle body frame retracts rearward of the vehicle body, while the hanger member supports the hanger member via the elastic member to the vehicle body. As a result, the hanger member moves relatively toward the front of the vehicle due to its inertial force. Therefore, the hanger member collides with the regulation member, and the collision causes the collision portion of the hanger member to be regulated by the regulation member, and the non-collision portion of the hanger member has the collision member centered on the regulation member side. It will rotate to. Along with this, a rotational force in the same direction acts on the exhaust pipe constituent portion on the upstream side of the hanger member, and the bent portion of the exhaust pipe is spread out so that the exhaust pipe becomes substantially straight from the upstream side to the downstream side. Become. Immediately before and after the correction of the curved portion, the exhaust pipe receives an impact force from the substantially axial direction and is compressed in the axial direction of the exhaust pipe. Therefore, at the time of a collision, it is possible to prevent the curved portion of the exhaust pipe from expanding outward in the curved line and prevent the exhaust pipe from interfering with other members.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

1 to 6, reference numeral 1 denotes a vehicle body frame that constitutes a vehicle body. The vehicle body frame 1 is provided with a pair of front side frames 2 on both left and right sides at a front portion of the vehicle body. The front cross member 3 and the reinforcing cross member 4 are horizontally mounted from the front side to the rear side of the vehicle body.

The reinforcing cross member 4 is provided with a pair of supporting members 5 at intervals in the vehicle width direction.
It extends downward. A hanger member 6 is connected to the lower ends of the pair of supporting members 5 via an elastic member 7 as shown in FIGS. 2 and 3, and the hanger member 6 is parallel to the reinforcing cross member 4. It is arranged.

The hanger member 6 is a support rod 8 that straddles between the elastic members 7.
And a holding plate 9 fixed to the support rod 8. The holding plate 9 is provided with a collision part 9a projecting upward, and its tip is bent forward of the vehicle body. Has been. The holding plate 9 is provided with an exhaust pipe pedestal 10. An exhaust pipe 11 is fixed to the exhaust pipe pedestal 10, and the exhaust pipe 11 extends in the front-rear direction of the vehicle body (left-right direction in FIG. 1). The upstream end of the exhaust pipe 11 is connected to an exhaust manifold (not shown). The exhaust pipe 11 is provided between the upstream end of the exhaust pipe 11 and the hanger member 6 in order to avoid interference with other members. The collision portion 9a has a curved portion 12 that is curved in a convex shape in the vehicle width direction so that the collision portion 9a is located on the curved inner side. Further, in the exhaust pipe 11, a flexible tube 13 is provided between the upstream end of the exhaust pipe 11 and the curved portion 12, and a catalytic converter 14 is provided downstream of the hanger member 6.

A restriction member 15 is fixed to the reinforcing cross member 4. The regulating member 15 extends downward from the reinforcing cross member 14, and the lower end portion of the regulating member 15 faces the moving region of the collision portion 9a toward the front of the vehicle body.
As shown in FIG. 4, the regulating member 15 is provided with the collision portion 9
It has a recess 15a facing a, and the recess 15 is formed so that the tip of the collision part 9a can be fitted therein.

Therefore, in the above exhaust pipe support structure, when the vehicle collides head-on, the vehicle body frame 1 moves backward toward the rear of the vehicle body because of its rigidity. However, since the hanger member 6 is connected to the support 5 via the elastic member 7, inertia force acts on the hanger member 6 so that the hanger member 6 relatively moves toward the front of the vehicle body. By this movement of the hanger member 6,
The collision portion 9a of the hanger member 6 collides with the regulation member 15, and the tip end of the collision portion 9a is regulated by the regulation member 15 so that it cannot be displaced and the non-collision portion of the hanger member 6 is affected by inertial force. Focusing on the collision part 9a in FIG. 6,
It rotates counterclockwise (indicated by an arrow in FIG. 6). Along with this, the turning force in the same direction acts on the exhaust pipe constituent portion on the upstream side of the hanger member 6, and the exhaust pipe 11 is connected to the upstream end of the exhaust pipe 11 and the exhaust manifold. A force is applied in the direction in which the bending portion 12 is widened against the connection relationship, so that the exhaust pipe 11 becomes substantially straight from the upstream side to the downstream side of the exhaust pipe 11 as shown in FIG. . Before or after the correction of the curved portion 12, the exhaust pipe 11 receives an impact force from the substantially axial direction thereof and is compressed in the axial direction of the exhaust pipe 11.
Therefore, the bending portion 12 of the exhaust pipe 11 is prevented from being bent and expanded outward in the bending, and the exhaust pipe 11 does not deviate from its original supporting position and interfere with other members. Further, when the curved portion 12 is straightened, the exhaust pipe 11 rotates as described above, but since the position change of the exhaust pipe 11 due to the rotation of the exhaust pipe 11 is not so large, the exhaust pipe 1
There is no possibility that the exhaust pipe 11 and other members may interfere with each other even when the rotary shaft 1 is rotated.

Moreover, in this embodiment, the flexible tube 1
3 is interposed in the exhaust pipe 11, the exhaust pipe 11
The turning force acting on the flexible tube 13 also acts on the flexible tube 13, and the downstream side of the flexible tube 13 bends in the same direction as the turning force direction of the exhaust pipe 11 with respect to the upstream side of the flexible tube 13, Due to the bending, the exhaust path including the flexible tube 13 meanders to the left and right. In this case, since the flexible tube 13 is shorter than the entire exhaust pipe 11 and is provided in the vicinity of the exhaust manifold, even if the downstream side of the flexible tube 13 is curved, the impact force at the time of collision is the same. It acts on the downstream side of the flexible tube 13 in the axial direction of the downstream side thereof, and does not hinder the deformation of the exhaust pipe 11 due to compression.

(Advantages of the Invention) As described above, the present invention can prevent the curved portion of the exhaust pipe from expanding outward in the curved state at the time of a collision, so that the exhaust pipe and other members do not interfere with each other.

[Brief description of drawings]

1 is a plan view showing an exhaust pipe support structure according to an embodiment of the present invention, FIG. 2 is an enlarged partial front view of FIG. 1, FIG. 3 is a sectional view taken along line III-III of FIG. FIG. 4 is a sectional view taken along the line IV-IV in FIG. 2, FIG. 5 is an explanatory view showing the shape of a normally attached exhaust pipe, and FIG. 6 is an operation state diagram of FIG. 1: Body frame 6: Hanger member 7: Elastic member 11: Exhaust pipe 12: Curved part 15: Restriction member

Claims (1)

[Scope of utility model registration request] 1. A hanger member is attached to a vehicle body frame via an elastic member, and an exhaust pipe extending in the vehicle body front-rear direction is fixed to the hanger member, and the exhaust pipe is curved toward the front of the vehicle body with respect to the hanger member. In an exhaust pipe support structure of an engine having, a regulating member is fixed to the vehicle body frame, the regulating member being on the inside of the curve of the bending portion, and based on an inertial force directed toward the front of the vehicle at the time of a collision. An exhaust pipe support structure for an engine, wherein the hanger member is positioned only in a moving area of the hanger member.