JPH0721375Y2 - Engine exhaust system support device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an exhaust system supporting device for an engine.

(Prior Art) Generally, in an automobile (for example, an F / R vehicle), an exhaust system extending from an engine arranged in a front portion of a vehicle body is extended in a vehicle longitudinal direction at a central portion of the vehicle body to be opened to a rear side of the vehicle body, and Is hung and supported on the vehicle body side via a hanger bracket and an elastic body (see, for example, Shokai Sho-60-11).
(See Japanese Patent No. 2623).

However, when the exhaust system is supported on the vehicle body side as described above, there is a problem in that vibration of the exhaust system is easily transmitted to the vehicle interior and the vehicle interior noise increases.

Further, as disclosed in the above-mentioned publicly known example, one end of the exhaust system is fixed to an engine supported on the vehicle body side through an engine mount, whereas the hanger support portion of the exhaust system is directly attached to the vehicle body side. Since it is supported, a phase difference of vibration occurs between the engine support part of the exhaust system and the hanger support part,
There was a risk that the reliability of the exhaust system would be adversely affected.

Furthermore, since the elastic body that elastically supports the exhaust system is arranged close to the exhaust system that becomes hot, it is necessary to pay particular attention to heat damage (heat deterioration, etc.). As disclosed in known examples, it is common to arrange the elastic body directly near the exhaust system, and it is difficult to say that measures against heat damage to the elastic body are taken.

(Purpose of the Invention) The present invention is intended to solve the problems pointed out in the above-mentioned prior art, and in an engine in which an exhaust system is suspended and supported via a hanger bracket and an elastic body,
The input of exhaust system vibration to the passenger compartment is reduced to reduce the sound inside the vehicle, and the exhaust system is vibrated in the same direction as the engine to improve the reliability of the exhaust system. It is an object of the present invention to provide an exhaust system supporting device which can be prevented as much as possible.

(Means for Achieving the Purpose) In the present invention, as means for achieving the above object, a propeller shaft for interlockingly connecting a transmission arranged at a front portion of a vehicle body and a rear differential arranged at a rear portion of the vehicle body is provided. In an engine in which an exhaust system is arranged side by side, a transmission case and a rear differential case are integrally connected by a propeller shaft and a reinforcing frame that is arranged laterally of the exhaust system and in the longitudinal direction of the vehicle body. On the other hand, the exhaust system is elastically supported by the reinforcing frame via a hanger bracket and an elastic body, and the rubber is positioned on the opposite side of the exhaust system with respect to the reinforcing frame.

(Operation) In the present invention, by the above means, (1) the exhaust system is elastically supported by the reinforcing frame that connects the transmission case and the rear differential case. The input of exhaust system vibration to the passenger compartment is reduced compared to the case where it is elastically supported. (B) One end of the exhaust system is connected to the engine, and
Since the hanger support part is supported by the reinforcing frame indirectly connected to the engine side through the transmission case, the exhaust system as a whole can vibrate in the same direction as the engine in the same phase, The vibration phase difference in the system is eliminated. (2) The radiant heat of the exhaust system is transferred to the elastic body side from the location where the elastic body supporting the exhaust system is located on the opposite side of the exhaust system with respect to the reinforcing frame. It is possible to obtain the effect that is blocked by the reinforcing frame as much as possible.

(Embodiment) A preferred embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

1 and 2 show the main parts of an exhaust system and a power transmission system of an F / R type automobile equipped with an exhaust system supporting device according to an embodiment of the present invention, and in FIG. Is a transmission mounted at the rear end of an engine (not shown), 2 is a rear differential, and the transmission 1 and the rear differential 2 are interlocked and connected via a propeller shaft 4. Further, between the case 21 of the transmission 1 and the case 22 of the rear differential 2, a reinforcing frame 3 having a substantially U-shaped cross section is arranged by applying the present invention, and the transmission case 21 and the rear differential are arranged. The case 22 is integrally connected via the reinforcing frame 3. The reinforcing frame 3 has an upper end portion as shown in FIG.
The propeller shaft 4 is mounted by 3a so as to surround the propeller shaft 4 from the side with the edge portion facing inward. Further, the lower end portion 3b of the reinforcing frame 3 protrudes downward more than the propeller shaft 4, and the lower end portion 3b
An exhaust gas purification device 53 of the exhaust system 5, which will be described later, is arranged close to the inside of 3b.

In this way, when the transmission case 21 and the rear differential case 22 are connected by the reinforcing frame 3 and the two are integrated, there are three major advantages as described below. To briefly explain this, first,
The advantage is that the structure is simplified by the reduction of the mount.
That is, the engine is generally supported by a total of three mounts, a pair of engine mounts provided on the left and right of the engine and a transmission mount provided on the transmission 1.
The rear differential 2 is supported by a total of three differential mounts, which are a pair of left and right mounts and a mount provided at the front end portion 2a thereof. As described above, the transmission case 21 and the rear differential case 22 are reinforced with a rigid reinforcing frame 3 In the case of connection with the above, the mission mount can be eliminated on the engine side and the differential mount on the front end portion on the rear differential 2 side can be eliminated, thereby simplifying the mount structure.

The second advantage is the reduction of vibration input into the passenger compartment. That is, since the mission mount can be abolished as described above, the mission vibration that is conventionally input into the vehicle interior via the mission mount is eliminated,
The vibration input to the passenger compartment is reduced to that extent.

The third advantage is an improved driving feeling. That is,
When the transmission 1 side is supported by the transmission mount as in the conventional case, since the supporting rigidity for the transmission 1 is relatively low, the change lever provided in the transmission 1 largely shakes with the engine vibration, and the driver's feeling is improved. However, when the rear end of the transmission case 21 is connected to the rear differential case 22 via the reinforcing frame 3 in this way, the mounting point of the transmission 1 side with respect to the engine is extended to the rear differential 2 side. Therefore, the support rigidity for the transmission 1 is increased, and the vibration of the change lever is reduced as much as possible.

On the other hand, in a diagonally lower position of the reinforcing frame 3, a front pipe 51 having one end connected to the engine side, a rear pipe 52 having one end opening to the rear side of the vehicle body, and the rear pipe 52 are arranged between the front pipe 51 and the rear pipe 52. Exhaust gas purification device 53
An exhaust system 5 composed of and is provided in the vehicle length direction along the propeller shaft 4. The exhaust system 5 is elastically suspended and supported by both the vehicle body and the reinforcing frame 3 at the boundary between the exhaust purification device 53 and the rear pipe 52. That is, of the both ends 10a, 10b of the exhaust system support member 10 that supports the exhaust purification device 53, one end 10a is the first elastic body with respect to the first hanger bracket 6 fixed to the floor panel 11. It is elastically suspended and supported via 7. Further, the other end 10b of the exhaust system support member 10 is elastic to the second hanger bracket 8 provided on the reinforcing frame 3 side with respect to the second hanger bracket 8 via the second elastic body 9. It is suspended and supported.

Thus, when one of the two hanger brackets 6 and 8 is provided on the reinforcing frame 3 side, for example, both of the two hanger brackets 6 and 8 are provided on the floor panel 11 side. Exhaust system 5 compared to the case
It is possible to reduce the vibration input to the vehicle interior, and the interior of the vehicle can be reduced accordingly.

Further, since the exhaust system 5 is supported by the reinforcing frame 3 that vibrates substantially integrally with the engine, in this exhaust system 5, a vibration phase difference between the hanger portion and one end portion connected to the engine is possible. The advantage is that the reliability is improved because it is reduced as much as possible and there is no occurrence of irregular stress.

Further, in this embodiment, the reinforcing frame 3
Since the second elastic body 9 located on the side is arranged on the side opposite to the exhaust system 5 with respect to the reinforcing frame 3, the reinforcing frame 3 is transmitted from the exhaust system 5 to the second elastic body 9 side and the radiant heat is transmitted. The radiant heat transfer to the side of the second elastic body 9 is suppressed as much as possible, and the generation of heat damage to the second elastic body 9 is effectively prevented.

(Effects of the Invention) The present invention relates to an engine in which an exhaust system is arranged alongside a propeller shaft that interlocks and connects a transmission arranged in the front part of a vehicle and a rear differential arranged in the rear part of the vehicle. The transmission case and the rear differential are integrally connected by a reinforcing frame arranged laterally of the propeller and the exhaust system and in the front-rear direction of the vehicle body while the hanger bracket and the elastic body are used to connect the reinforcing frame to the reinforcing frame. The exhaust system is elastically supported, and the rubber is positioned on the opposite side of the exhaust system with respect to the reinforcing frame.

Therefore, according to the engine exhaust system supporting device of the present invention, (1) the exhaust system is elastically supported by the reinforcing frame connecting between the transmission case and the rear differential case. For example, compared to a case where this is elastically supported on the vehicle body side, the input of exhaust system vibration into the vehicle interior is reduced, and the vehicle interior sound can be reduced. (B) One end of the exhaust system is connected to the engine, and
Since the hanger support portion is supported by the reinforcing frame indirectly connected to the engine side via the transmission, the exhaust system can vibrate in the same direction as the engine in the same phase as the entire exhaust system. The reliability is improved by eliminating the vibration phase difference in the interior of the exhaust system. (2) From the location where the elastic body supporting the exhaust system is located on the opposite side of the exhaust system to the reinforcement frame, The reinforcement frame blocks the transmission of radiant heat to the side of the elastic body as much as possible, and suppresses the occurrence of heat damage such as thermal deterioration of the elastic body as much as possible.

[Brief description of drawings]

FIG. 1 is a plan view of a main part of an exhaust system of an automobile equipped with an exhaust system supporting device according to an embodiment of the present invention, and FIG. 2 is a II-II of FIG.
It is a line sectional view. 1 …… Transmission 2 …… Rear differential 3 …… Reinforcement frame 4 …… Propeller shaft 5 …… Exhaust system 6,8 …… Hanger bracket 7,9 …… Elastic body 10 …… Exhaust system support member 11 …… Floor panel

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. An engine in which an exhaust system is arranged alongside a propeller shaft that interlocks and connects a transmission arranged in a front part of a vehicle body and a rear differential arranged in a rear part of the vehicle body with a transmission case. The rear differential case is integrally connected to a side of the propeller shaft and the exhaust system by a reinforcing frame arranged in the vehicle front-rear direction, and the reinforcing frame is further connected to the reinforcing frame via a hanger bracket and an elastic body. The exhaust system supporting device for an engine, wherein the exhaust system is elastically supported, and the rubber is positioned on the opposite side of the exhaust system with respect to the reinforcing frame.