JP4568165B2 - Exhaust system support member - Google Patents

Description

  The present invention relates to an exhaust system support member for supporting an exhaust system connected to an engine of a vehicle such as an automobile on a vehicle body.

  As shown in FIG. 6, an exhaust system support member (hereinafter sometimes simply referred to as a “support member”) for suspending an exhaust system connected to an automobile engine from the bottom of a vehicle body is a side view. There is a hook-shaped support member 50 constituted by a solid bar bent to have an L shape. In the support member 50, the vertical portion 50 a is welded to the bottom surface 60 a of the vehicle body frame 60, and the mounting hook 8 a joined to the exhaust pipe 8 of the exhaust system is connected to the horizontal portion 50 b through the elastic member 20. (For example, refer to Patent Document 1).

Since the bottom of the body frame 60 is generally galvanized for rust prevention, the support member 50 is a steel material such as SS400 that can be welded to the galvanized portion. It is constituted by.
JP 2002-036889 (paragraph 0022, FIG. 1)

  In the conventional support member 50 described above, the whole is constituted by a solid rod, and the horizontal portion 50b protruding in the horizontal direction is heavy. As a result, the natural frequency of the support member 50 is lowered, and the support member 50 resonates with respect to the vibration transmitted from the exhaust pipe 8 through the elastic member 20 to the horizontal portion 50b. There is a problem that the NV (noise and vibration) performance of the automobile, that is, the vibration noise and vibration suppression performance is lowered.

In addition, it is conceivable to increase the natural frequency of the support member and prevent resonance of the support member by reducing the weight by configuring the entire support member with a hollow steel pipe. There exists a problem that the intensity | strength of a support member will become low early by corrosion.
Therefore, it is considered that the entire support member is constituted by a hollow steel pipe having excellent corrosion resistance, and the thickness of the steel pipe is reduced to reduce the weight of the support member and prevent the strength of the support member from being reduced by rust. . And as a steel material excellent in corrosion resistance, for example, it is preferable to use a stainless steel material that is lightweight and excellent in corrosion resistance. However, this stainless steel material has poor weldability with respect to a galvanized portion, and its joint portion. Therefore, there is a problem that it is difficult to reliably join the support member to the vehicle body frame.

  In the present invention, by solving the above-mentioned problems and improving the corrosion resistance of the tip part to which the exhaust system is connected, the thickness of the tip part can be reduced and the weight can be reduced, and the natural frequency of the exhaust system support member can be reduced. The exhaust system support member that can improve the NV performance of the vehicle by increasing the resonance of the exhaust system support with respect to the vibration of the exhaust system and can reliably join the exhaust system support member and the vehicle body. It is an issue to provide.

In order to solve the above-described problems, the present invention provides an exhaust system support member for supporting an exhaust system connected to an engine of a vehicle on a vehicle body of the vehicle, a base end portion welded to the vehicle body, an exhaust system The base end is made of a material that is weldable to the galvanized car body, and the tip is more corrosion resistant than the base end. It is a hollow body made of an excellent stainless steel material .

As described above, in the exhaust system support member of the present invention, the distal end portion to which the exhaust system is connected is made of a steel material that has better corrosion resistance than the proximal end portion, and the distal end portion can be prevented from corrosion due to rust. Since the tip portion can be made thinner and lighter, the natural frequency of the exhaust system support member can be increased. Thereby, the resonance of the exhaust system support member with respect to the vibration from the exhaust system can be prevented, and the vibration of the exhaust system support member is reduced, so that the vibration of the exhaust system can be hardly transmitted to the vehicle body.
Further, since the base end portion is made of a steel material that can be welded to the vehicle body, the exhaust system support member can be reliably joined to the vehicle body. In addition, when the tip part is made of stainless steel as a steel material having better corrosion resistance than the base end part, the base end part of the exhaust system support member is a steel material different from the stainless steel material at the tip part. It is comprised by the steel material which can be welded to. Therefore, even if the tip is made of a stainless steel material, the exhaust system support member can be welded to the galvanized vehicle body, and the joint portion between the exhaust system support member and the vehicle body Therefore, the exhaust system support member can be reliably joined to the vehicle body.

In addition, the tip of the exhaust system support member is formed of a hollow body, and by reducing the weight of the tip, the natural frequency of the exhaust system support member can be sufficiently increased, and the resonance of the exhaust system support member can be effectively reduced. Can be prevented.
Moreover, since the thickness of the base end portion is sufficiently secured by configuring the base end portion with the solid body, it is possible to prevent the strength of the joint portion from being reduced due to corrosion due to rust.

In the above-described exhaust system support member, the base end portion can also be constituted by a plate-like member joined to two different surfaces of the vehicle body.

  In this way, by configuring the base end portion with a plate-like member that can be welded to the vehicle body, the exhaust system support member joined to the vehicle body can be stabilized, and the mounting rigidity between the exhaust system support member and the vehicle body is improved. Can be made.

According to the exhaust system support member of the present invention, the distal end portion to which the exhaust system is connected is made of a steel material that has better corrosion resistance than the proximal end portion, and the distal end portion can be prevented from corrosion due to rust. Since the thickness of the portion can be reduced and the weight can be reduced, the natural frequency of the exhaust system support member can be increased. Accordingly, resonance of the exhaust system support member with respect to vibration from the exhaust system can be prevented, and vibration of the exhaust system support member is reduced, so that the vibration of the exhaust system can be made difficult to be transmitted to the vehicle body. Performance can be improved.
Further, since the base end portion is made of a steel material that can be welded to the vehicle body, the exhaust system support member can be reliably joined to the vehicle body.

Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
FIG. 1 is a perspective view of a main part of a rear part of a vehicle body to which a support member of this embodiment is attached as viewed from the rear. FIG. 2 is a perspective view of the state in which the support member of the present embodiment is attached to the rear part of the vehicle body as viewed from the rear. FIG. 3 is a side sectional view showing a state in which the support member of the present embodiment is attached to the rear part of the vehicle body. FIG. 4 is a side sectional view showing the support member of the present embodiment.
In the following description, “front and rear”, “left and right”, and “up and down” correspond to each direction of the automobile (see FIG. 1).
First, the configuration of the rear part of the vehicle body of the vehicle according to the present embodiment will be described, and then the support member (“exhaust system support member” in claims) and the support member mounting structure will be described.

[Configuration of rear body]
As shown in FIG. 1, a vehicle body rear portion 1 includes a pair of rear side frames 2, 2 disposed on the left and right sides of the vehicle body rear portion 1, and a middle cross member 3 and a rear portion that are installed between the rear side frames 2, 2. A cross member 4 is provided, and a rear floor panel 5 is extended between the rear side frames 2 and 2 from the middle cross member 3 toward the rear.
Note that the vehicle body of the automobile according to the present embodiment is made of a galvanized steel sheet or the like.

  The middle cross member 3 is a steel plate extending in the left-right direction of the rear part 1 of the vehicle body, and the rear part is vertically raised as shown in FIG. Further, a vertical flange 3a extends downward from the front end portion, and a horizontal flange 3b extends rearward from an upper end portion of the rear portion. An upper surface 3c of the horizontal flange 3b is formed on the rear floor panel 5. It is joined to the front end.

As shown in FIG. 1, the rear floor panel 5 has a vertical wall portion 5a formed at a substantially central portion in the front-rear direction, and extends from the upper end portion of the vertical wall portion 5a toward the middle cross member 3 side. An inclined wall portion 5b inclined obliquely downward in the middle and a horizontal wall portion 5c extending rearward from the lower end portion of the vertical wall portion 5a are formed. And the rear cross member 4 is joined to the corner | angular part comprised by the front side surface of the vertical wall part 5a, and the bottom face of the inclination wall part 5b.
In addition, the inclined wall part 5b comprises the floor surface for attaching a rear seat (not shown), and the horizontal wall part 5c comprises the floor surface of the cargo compartment. Furthermore, the cross member 6 constructed by each rear side frame 2 and 2 is joined to the bottom face of the substantially center part in the front-back direction of the horizontal wall part 5c.

In addition, a pair of left and right side sills 9, 9 constituting the front part of the vehicle body are connected to the front end portions of the rear side frames 2, 2, and between the side sills 9, 9 forward from the middle cross member 3. A front floor panel 7 is extended toward the front.
As shown in FIG. 3, the front floor panel 7 has a vertical wall portion 7a raised at the rear, and the vertical wall portion 7a is joined to the front side surface 3d of the vertical flange 3a of the middle cross member 3 so as to be vertical. A horizontal wall portion 7 b extending rearward from the upper end portion of the wall portion 7 a is joined to the upper surface 5 d of the rear floor panel 5.

  Further, as shown in FIGS. 2 and 3, an exhaust pipe of an exhaust system extending from an exhaust port of an automobile engine (not shown) to a rear end portion of the rear body 1 is provided at the bottom of the rear body 1. 8 is suspended, and a support member 10 (an “exhaust system support member” in the claims) supporting the exhaust pipe 8 is joined to the middle cross member 3.

[Configuration of support member]
As shown in FIGS. 2 and 3, the support member 10 is a hook-shaped member formed in an L shape in a side view, and a base end portion 11 joined to the middle cross member 3 of the vehicle body rear portion 1; The tip portion 12 to which the exhaust pipe 8 is connected is made of a different material.

  As shown in FIG. 4, the base end portion 11 is a solid steel bar (“solid” in the claims) having a circular cross section bent into an L shape in a side view, and includes a vertical portion 11 a and a horizontal portion. 11b. The base end portion 11 is made of a steel material that can be joined by arc welding to a galvanized portion. In the present embodiment, a solid steel rod of SS400 is used.

The distal end portion 12 is configured to have the same diameter as the proximal end portion 11 by a hollow stainless steel pipe (“steel material excellent in corrosion resistance” and “hollow body” in the claims) having superior corrosion resistance than SS400 of the proximal end portion 11. Has been. The front end portion 12 is arranged in the front-rear direction, and the front end portion 12 b is friction-welded (friction welded) to the rear end portion 11 c of the horizontal portion 11 b of the base end portion 11. And the base end 11 are integrated.
Thus, since the front-end | tip part 12 can be prevented from corrosion by rust by comprising the front-end | tip part 12 with the stainless steel pipe | tube excellent in corrosion resistance, the thickness of the front-end | tip part 12 can be made thin and it can be reduced in weight.

  In the present embodiment, the base end portion 11 that is a solid steel rod of SS400 and the tip end portion 12 that is a stainless steel pipe are integrated by friction welding, but different materials can be reliably bonded. If possible, the joining method is not limited, and a welding method such as arc welding may be used. Furthermore, even if the distal end portion 12 and the proximal end portion 11 are integrated by inserting the rear end portion 11c of the horizontal portion 11b of the proximal end portion 11 into the front end portion 12b of the distal end portion 12 and fitting the same. Good.

  As shown in FIGS. 2 and 3, the attachment hook 8 a of the exhaust pipe 8 is connected to the distal end portion 12 of the support member 10 via the elastic member 20. The attachment hook 8a of the exhaust pipe 8 is constituted by a solid steel rod having a circular cross section bent into an L shape, and its base end is fixed to the outer surface of the exhaust pipe 8 via a fixing member 8b. Yes.

The elastic member 20 is an oval rubber member, and is formed with a pair of attachment holes 21a and 21b penetrating in the longitudinal direction (vertical direction). The support member 10 is provided in the attachment hole 21a disposed on the upper side. The distal end portion 12 of the exhaust pipe 8 is inserted into the mounting hole 21b disposed on the lower side.
In addition, diameter-expanded portions 12a and 8d having diameters larger than the mounting holes 21a and 21b of the elastic member 20 are formed at the end portion of the distal end portion 12 of the support member 10 and the end portion of the distal end portion 8c of the mounting hook 8a. The enlarged diameter portions 12a and 8d are engaged with the opening edges of the attachment holes 21a and 21b, thereby preventing the support member 10 and the attachment hook 8a from coming off.

[Support member mounting structure]
Next, the mounting structure of the support member 10 will be specifically described.
As shown in FIGS. 2 and 3, the support member 10 is welded to the rear side surface 3 e of the vertical flange 3 a of the middle cross member 3 by welding the vertical portion 10 a of the base end portion 11 to the bottom portion of the vehicle body rear portion 1. It is joined to.

Here, the base end portion 11 of the support member 10 is configured by a solid steel rod of SS400 that can be welded to a galvanized portion, and a base end portion that is a solid steel rod of SS400. Electrolytic corrosion does not occur in the joint portion 13 between the portion 11 and the galvanized portion, so that the base end portion 11 can be reliably joined to the middle cross member 3 that has been galvanized. it can.
Moreover, since the thickness is fully ensured by comprising the base end part 11 with a solid steel rod, it can prevent that the intensity | strength of a junction part falls by corrosion by rust.

Further, in the support member 10, the distal end portion 12 is made of a stainless steel pipe having better corrosion resistance than the proximal end portion 11, thereby reducing the thickness of the distal end portion 12 and reducing the weight of the distal end portion 12. The natural frequency of the member 10 is high.
Thereby, the resonance of the support member 10 with respect to the vibration from the exhaust pipe 8 can be prevented, and the vibration of the support member 10 is reduced. Therefore, the vibration of the exhaust pipe 8 becomes difficult to be transmitted to the rear part 1 of the vehicle, and the NV performance of the automobile Can be improved.

  In addition, since the exhaust pipe 8 is connected to the distal end portion 12 of the support member 10 via the elastic member 20, the vibration transmitted to the support member 10 is reduced by the vibration absorption effect of the elastic member 20, and the exhaust pipe 8 Vibration transmitted to the rear part 1 of the vehicle body is effectively reduced.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment. FIG. 5 is a side sectional view of a configuration in which the base end portion is formed of a steel plate, showing another configuration of the support member of the present embodiment.

  For example, in this embodiment, as shown in FIGS. 3 and 4, the base end portion 11 of the support member 10 is configured by an L-shaped solid steel rod in a side view, and the distal end portion 12 is formed by a hollow stainless steel tube. As shown in FIG. 5, the base end portion 11 'is formed of a stainless steel pipe and a steel plate (SP) that does not cause electrolytic corrosion, and can be welded to the bottom surface 3f and the rear side surface 3g of the middle cross member 3. And support member 10 'comprised by the stainless steel tube in which front-end | tip part 12' was formed in the L shape by the side view can be used. In this support member 10 ′, the vertical portion 12 c of the distal end portion 12 ′ is welded to the surface 11 d of the proximal end portion 11 ′, and the rear surface 11 e of the proximal end portion 11 ′ is attached to the bottom surface 3 f and the rear side surface 3 g of the middle cross member 3. It is welded in the attached state.

In this configuration, since the base end portion 11 ′ of the support member 10 ′ is joined to two surfaces in different directions, the vibration of the exhaust pipe 8 (see FIG. 2) is transmitted to the distal end portion 12 ′ of the support member 10 ′. Further, the pressing force or tensile force acting on the middle cross member 3 from the base end portion 11 ′ is dispersed. As a result, the attachment portion on the middle cross member 3 side is hardly deformed, and the vibration of the support member 10 ′ is reduced, so that the vibration transmitted from the exhaust pipe 8 (see FIG. 2) to the vehicle body rear portion 1 is effective. Can be reduced.
Further, by joining the base end portion 11 of the support member 10 ′ to two surfaces in different directions, not only the rigidity is improved with respect to the vertical shake but also the rigidity is improved with respect to the horizontal shake. It is possible to stabilize the support member 10 ′ joined to the vehicle body rear portion 1.

  Further, in the present embodiment, as shown in FIG. 2, the support member 10 joined to the middle cross member 3 has been described. However, the mounting location and number of the support members 10 are not limited, and are attached to the bottom of the vehicle body. It is desirable to provide a plurality of support members 10 according to the shape and weight distribution of the exhaust system so that the exhaust system can be stably supported.

Also, although configured by the real steel rod in the proximal portion 11 of the support member 10 SS400, weldable at a site zinc plated, any of steel electrolytic corrosion does not occur in the joint For example, the material is not limited, and various steel materials other than the steel material constituting the tip portion 12 can be used.

  Moreover, in this embodiment, although the front-end | tip part 11 is comprised with the hollow stainless steel pipe, if the front-end | tip part 11 can fully be reduced in weight, it will be by the steel material excellent in corrosion resistance rather than the base end part 12. You may comprise the front-end | tip part 11 with a solid stick.

It is the perspective view which looked at the principal part of the vehicle body rear part to which the support member of this embodiment is attached from back. It is the perspective view which looked at the state which attached the support member of this embodiment to the vehicle body rear part from back. It is the sectional side view which showed the state which attached the supporting member of this embodiment to the vehicle body rear part. It is the sectional side view which showed the supporting member of this embodiment. It is the figure which showed the other structure of the supporting member of this embodiment, and is a sectional side view of the structure by which the base end part is formed with the steel plate. It is the sectional side view which showed the conventional supporting member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Car body rear part 3 Middle cross member 8 Exhaust pipe 8a Mounting hook 10 Support member 11 Base end part 12 Tip part 20 Elastic member

Claims (2)

An exhaust system support member for supporting an exhaust system connected to an engine of a vehicle on a vehicle body of the vehicle,
The base end portion welded to the vehicle body and the tip end portion to which the exhaust system is connected are made of different materials,
The base end portion is a solid body made of a steel material that can be welded to the galvanized vehicle body, and the tip end portion is a hollow body made of a stainless steel material having better corrosion resistance than the base end portion. exhaust system support member, characterized in that. The exhaust system support member according to claim 1, wherein the base end portion is configured by a plate-like member joined to two different surfaces of the vehicle body.

Images