JP4336942B2 - Exhaust system for four-wheel drive vehicles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an exhaust device for a four-wheel drive vehicle, and more particularly to an exhaust device for a four-wheel drive vehicle having a function of preventing a front propeller shaft from dropping out from a transfer.
[0002]
[Prior art]
Conventionally, in an FR-based four-wheel drive vehicle with a longitudinal engine, the driving force of a transmission mounted at the rear of the engine is often transmitted to the front propeller shaft via a transfer distributed to the front wheels. The front propeller shaft is connected to the front differential. However, if the connecting portion is detached, the front propeller shaft may drop off and other vehicle members such as a transfer may be damaged.
[0003]
Further, in Patent Document 1, a transmission side mounting bracket that supports the transmission on the vehicle body side is provided, and a lever case mounting bracket that supports the shift device integrally provided on the transmission side mounting bracket on the transmission side is provided. A structure for preventing the propeller shaft from falling off is disclosed in which a pair of supporting arms facing the propeller shaft of the lever case mounting bracket on both sides in the width direction are connected to a dropout preventing member located on the lower side of the propeller shaft. .
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 11-310045
[Problems to be solved by the invention]
As described above, a four-wheel drive vehicle in which the engine is installed vertically has a front propeller shaft that transmits a driving force from the transmission to the front differential through the transfer, and the front propeller shaft and the front differential When the connecting portion is detached, the front propeller shaft hangs down and interferes with the ground, which may hinder traveling.
[0006]
In addition, the propeller shaft drop-off preventing structure disclosed in Patent Document 1 is provided with a shift device integrally provided on the transmission side mounting bracket, and a pair of support arms of a lever case mounting bracket that supports the transmission side. The drop-off prevention member that prevents the propeller shaft from falling off is connected so as to be located on the side. However, since the drop-off prevention member is provided as a separate member, the vehicle weight increases and the assembly becomes complicated. is there.
[0007]
The present invention has been made in view of this point, and an object of the present invention is to provide an exhaust device for a four-wheel drive vehicle that prevents the front propeller shaft from falling off using an existing exhaust pipe.
[0008]
[Means for Solving the Problems]
As a means for solving the above-mentioned problems, the present invention provides a vertical engine in which a crankshaft is disposed in the front-rear direction of the vehicle, and a shift gear mounted on a rear portion of the vertical engine. A transmission that distributes the driving force of the transmission to the front wheel side, a front propeller shaft that transmits the driving force from the transfer to the front differential, and an exhaust pipe having an engine side connecting portion connected to the engine. The exhaust pipe includes a downward extending portion extending continuously downward from the engine side connecting portion and a laterally extending laterally extending from the lower end of the downward extending portion in the lateral direction of the vehicle. And a rearward extension part that is connected to the laterally extending part and extends rearward of the vehicle. Either the downstream side of the laterally extending part or the rearward extension part is interposed via an elastic member. Supported by the body In the exhaust device for a four-wheel drive vehicle, in a cross-sectional view in the vehicle left-right direction, a triangular space is formed by the side surface of the transmission, the downward extension portion, and the left-right extension portion. The front propeller shaft is disposed so as to penetrate the inside, and further, the distance from the intersection where the front propeller shaft and the left and right direction extension portion intersect to the lower extension portion or the engine side connection portion, The front propeller shaft is arranged at a position smaller than a distance from the intersection to the elastic member .
With this configuration, when the connecting portion between the front propeller shaft and the front differential is detached , the front propeller shaft is prevented from drooping.
In addition, when the front propeller shaft is received by the laterally extending portion of the exhaust pipe, the load applied to the relatively weak elastic member interposed in the portion where the exhaust pipe is supported by the vehicle body is reduced. be able to.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an exhaust device for a four-wheel drive vehicle according to an embodiment of the present invention will be described in detail with reference to FIGS.
As shown in FIGS. 1 and 2, a vertical engine 1 having a crankshaft disposed in the vehicle front-rear direction is disposed in front of the vehicle, and a transmission 2 is disposed at the rear of the vertical engine 1. Further, a transfer 3 for distributing the driving force from the engine 1 to the front wheel side and the rear wheel side is disposed behind the transmission 2, and the driving force is transmitted from the transfer 3 to the front wheel side and the rear wheel side, respectively. The front propeller shaft 4 and the rear propeller shaft 6 that extend substantially parallel to the vehicle front-rear direction are connected to the front front differential 5 and the rear rear differential 7, respectively. Further, the exhaust pipe 10 constituting the exhaust device has an engine side connection portion 11 connected to the engine 1, and extends from the engine side connection portion 11 to the rear of the vehicle.
[0011]
As shown in FIG. 3, the exhaust pipe 10 includes an engine-side connection portion 11 that is connected to the engine 1, a lower extension portion 12 that continuously extends downward from the engine-side connection portion 11, and a lower extension thereof. It is comprised from the left-right direction extension part 14 extended from the lower end of the part 12 to the left-right direction of a vehicle, and the back extension part 15 extended from the left end of this left-right direction extension part 14 continuously to a vehicle rear. ing.
[0012]
The downward extending portion 12 is connected to the first downward extending portion 12a extending downward from the engine side connecting portion 11 which is a connecting portion with the engine 1, and the second downward extending portion 12b is connected to the lower extending portion 12a via the spherical joint 13. It extends to.
[0013]
The left-right direction extension part 14 continues from the lower end of the 2nd downward extension part 12b of the downward extension part 12, and has a predetermined space | interval with the lower end of the front propeller shaft 4 extended ahead from the transfer 3, It extends substantially parallel to the vehicle left-right direction so as to intersect the front propeller shaft 4. As shown in FIG. 4, the intersection where the front propeller shaft 4 and the left and right direction extending portion 14 intersect is the base of the left and right direction extending portion 14, that is, the engine side connecting portion 11 of the exhaust pipe 10 in the left and right direction of the vehicle. Is a position separated from the position connected to the engine 1 by a distance L1.
[0014]
The rear extension 15 is continuous from the left end of the left-right extension 14, and the catalyst 16 is interposed in the middle, and as shown in FIG. 1 in a plan view, the left side and the side of the transmission 2 and the transfer 3. As shown in FIG. 2, a first rear extension 15 a extending rearward slightly below the transmission 2 and the transfer 3, and a silencer 18 interposed in the middle, and a tail pipe 19 connected to the rear end The second rear extension 15b is connected via the spherical joint 17 and extends substantially parallel to the vehicle longitudinal direction.
[0015]
Moreover, the left-right direction extension part 14 and the back extension part 15 are elastically supported by the vehicle body side via the elastic members 20-24, respectively at a predetermined position.
First, a substantially L-shaped support shaft 20b protrudes forward at the base of the first rear extension 15a in the vicinity of the connection portion between the left and right extension 14 and the rear extension 15. A block-shaped elastic member 20 is inserted through the support shaft 20b, and a mounting bolt 20a is inserted through the elastic member 20 and elastically supported by the vehicle body 30 (see FIG. 4).
[0016]
Here, the mounting position of the base portion of the first rear extension portion 15a in the vicinity of the connection portion between the left and right extension portion 14 and the rear extension portion 15 and the vehicle body side is as shown in FIG. The front propeller shaft 4 and the laterally extending portion 14 are spaced from each other by a distance L2. This distance L2 is the distance L1 from the position at which the engine side connecting portion 11 of the exhaust pipe 10 is connected to the engine 1 to the intersection where the front propeller shaft 4 and the left and right extending portion 14 of the exhaust pipe 10 intersect. It is set longer.
[0017]
Further, as shown in FIG. 3, the other portion where the rearward extension 15 of the exhaust pipe 10 is supported by the vehicle body is in the vicinity of the connection part between the second rearward extension 15b and the first rearward extension 15a. , The front surface of the silencer 18 and the rear upper surface of the silencer 18, and support shafts 21 b, 24 b, and 22 b are protruded in respective directions from the respective portions, and are blocked on these support shafts 21 b, 24 b, and 22 b. The elastic members 21, 24, and 22 are inserted, and the elastic bolts 21 a, 24 a, and 22 a are inserted into the elastic members 21, 24, and 22 and are elastically supported by the vehicle body. Furthermore, a support bracket 23b protrudes also in the vicinity of the tail end of the tail pipe 19 of the second rear extension 15b, and the support bracket 23b and the block-like elastic member 23 are fixed by a mounting bolt 23a. At the same time, the elastic member 23 is elastically supported on the vehicle body by a mounting bolt 23a.
[0018]
According to the exhaust device for a four-wheel drive vehicle of the embodiment of the present invention, the front propeller shaft 4 that transmits the driving force from the transfer 3 to the front differential 5 is transferred to the existing exhaust pipe 10 at the front side. Since the laterally extending portion 14 extending in the lateral direction of the vehicle so as to intersect the propeller shaft 4 is configured, when the connecting portion between the front propeller shaft 4 and the front differential 5 is detached, the front propeller shaft 4 is exhausted. It can be received by the laterally extending portion 14 of the tube 10 and the influence on other vehicle members can be minimized.
[0019]
Further, in the left-right direction of the vehicle, the base of the rearward extension 15 of the exhaust pipe 10 is fixed via the elastic member 20 from the intersection where the left-right extension 14 of the exhaust pipe 10 and the front propeller shaft 4 intersect. Since the distance L2 to the position is set to be longer than the distance L1 from the above-described intersection to the position where the engine side connection portion 11 of the exhaust pipe 10 is connected to the engine 1, the dropped front propeller shaft 4 is exhausted. When received by the laterally extending portion 14 of the pipe 10, a load applied to the relatively weak elastic member 20 interposed in a portion where the rearward extending portion 15 of the exhaust pipe 10 is supported by the vehicle body is applied. Can be reduced.
[0020]
【The invention's effect】
As described above, according to the invention as set forth in claim 1, if the connection between the front propeller shaft and the front differential is detached, it is possible to minimize the damage to other vehicle components. In addition, since a part of the existing exhaust pipe is used as a drop-off prevention member, it is not necessary to provide a drop-off prevention structure or the like as a separate member, and the vehicle weight does not increase and assembly is facilitated.
Further, when the front propeller shaft is received by the laterally extending portion of the exhaust pipe, the load applied to the relatively weak elastic member interposed in the portion where the exhaust pipe is supported by the vehicle body is reduced. be able to.
[Brief description of the drawings]
FIG. 1 is a plan view of a vehicle employing an exhaust device for a four-wheel drive vehicle according to an embodiment of the present invention.
FIG. 2 is a side view of a vehicle employing an exhaust device for a four-wheel drive vehicle according to an embodiment of the present invention.
FIG. 3 is a perspective view showing a positional relationship between an exhaust pipe and a front propeller shaft constituting the exhaust device for a four-wheel drive vehicle according to the embodiment of the present invention.
4 is a cross-sectional view taken along line AA in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Engine 2 Transmission 3 Transfer 4 Front propeller shaft 5 Front differential 10 Exhaust pipe 11 Engine side connection part 14 Left-right direction extension part 15 Back extension part 20 Elastic member 30 Car body

Claims (1)

A vertical engine in which the crankshaft is arranged in the longitudinal direction of the vehicle, a transmission mounted at the rear of the vertical engine, a transfer that distributes the driving force of the transmission to the front wheels, and a front differential from the transfer. A front propeller shaft for transmitting a driving force to the engine and an exhaust pipe having an engine side connection portion connected to the engine, the exhaust pipe continuously extending downward from the engine side connection portion to the vehicle lower side An extension part, a left-right extension part continuously extending from the lower end of the downward extension part in the left-right direction of the vehicle, and a rear extension part connected to the left-right extension part and extending rearward of the vehicle. In an exhaust device for a four-wheel drive vehicle, wherein either the downstream side of the left-right extension part or the rear extension part is supported by a vehicle body via an elastic member,
In a cross-sectional view in the vehicle left-right direction, a side surface of the transmission, the downwardly extending portion, and the leftward / rightward extending portion form a triangular space, and the front propeller shaft extends through the space. Arrange
Furthermore, the position where the distance from the intersection where the front propeller shaft and the left-right extension part intersect to the downward extension part or the engine side connection part is smaller than the distance from the intersection to the elastic member An exhaust device for a four-wheel drive vehicle, characterized in that the front propeller shaft is disposed in the vehicle.

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