JPH0565033A - Power train structure for vehicle - Google Patents

Abstract

PURPOSE:To form a power train in a compact shape by arranging in parallel a clutch or a torque converter in the part, located on the rear side of the car body, with a traversely installed engine and properly arranging an exhaust pipe when an exhaust port is positioned to the front side part of the engine. CONSTITUTION:An engine 7 is traversely installed in an engine room 3. A biaxial type transmission 12 is arranged in parallel in the part, located on the rear side of a car body, of the engine 7. An exhaust port 10 is positioned on the front side part of the engine 7, and an exhaust pipe 40 is communicated to the exhaust port 10. After the exhaust pipe 40 is extended downward, it is bent toward the rear of a car body and passes through a recessed part 13, formed in an oil pan 11, to the rear of a car body. Thus, in comparison with a case that the exhaust pipe runs through a space below the engine, the length of the exhaust pipe can be reduced and the length in a vertical direction of a power train can be shortened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powertrain structure for a vehicle, and more particularly to an improvement of a horizontal engine arrangement.

[0002]

2. Description of the Related Art Conventionally, as a power train structure for a vehicle of this type, as disclosed in Japanese Utility Model Publication No. 48-22887, for example, a crankshaft of an engine is arranged in a vehicle width direction in an engine room at the front of a vehicle body. The powertrain is compactly arranged in the front-rear direction and the width direction of the vehicle body by horizontally arranging the transmission and the transmission in the rear of the vehicle body by arranging the transmission in parallel with the crankshaft of the engine in parallel with the shaft. It is known that it is shortened.

In the above publication, the exhaust port is located on the front side of the engine body, and the exhaust pipe communicating with the exhaust port is extended downward from the front side of the engine on the exhaust port side. After that, it is arranged so that it extends under the engine and extends toward the rear of the vehicle body.

[0004]

However, in the above-mentioned prior art, since the exhaust pipe passes below the engine, the length of the exhaust pipe becomes longer and the vertical length of the power train becomes longer accordingly, which results in a vehicle having a longer length. Attempting to secure the minimum ground clearance has a drawback that the height position of the vehicle hood is correspondingly increased.

The present invention has been made in view of the above problems, and an object thereof is a power train structure in which a horizontal engine having an exhaust port positioned on the front side and a transmission are arranged in parallel as described above. In order to shorten the length of the exhaust pipe and the vertical length of the powertrain by appropriately disposing the exhaust pipe in the empty space in the engine room. In that case, in consideration of the interference between the equipment arranged in the engine room and the exhaust pipe, the arrangement of the interfering equipment is also changed appropriately to ensure the proper arrangement of the exhaust pipe.

[0006]

In order to achieve the above object, in the invention according to the present application, the transverse engine and the transmission have different lengths in the vehicle width direction, and the transmission is shorter. Focusing attention, a part of the oil pan is recessed in the engine portion where this transmission is not located, and the exhaust pipe is arranged in this recess. When the differential for the front wheels interferes with the exhaust pipe arranged in this way, the arrangement of the differential is changed.

That is, the concrete means for solving the problems of the first aspect of the invention is to arrange the engine horizontally in the engine room at the front of the vehicle body and to arrange the transmission behind the engine in the crankshaft of the engine. It is a power train structure of a vehicle arranged in parallel in parallel with the above engine,
It is assumed that the exhaust port is arranged on the front side of the vehicle body. A recess is formed in a portion of the oil pan of the engine other than the portion where the transmission is located, and an exhaust pipe communicating with the exhaust port is passed through the recess of the oil pan to the vehicle body. It is configured to extend to the rear.

Further, a concrete solving means of the invention described in claim 2 has all the constitutions of the invention described in claim 1, and further, when a differential is arranged at the rear of the vehicle body of the transmission, The gear portion of the differential is offset from the final gear on the side opposite to the side where the exhaust pipe is located.

[0009]

With the above construction, in the invention of claim 1,
Assuming a powertrain structure in which transmissions are arranged in parallel behind the vehicle body of a horizontal engine, the exhaust pipe communicating with the exhaust port located on the front side of the engine extends downward from the exhaust port side, and then the engine Bends rearward of the vehicle body at the height position of the oil pan portion, passes through the concave portion of the oil pan, and then extends rearwardly of the vehicle body laterally of the transmission. Therefore, since the exhaust pipe is not located below the bottom of the oil pan, the exhaust pipe length is shortened and the vertical length of the power train is shortened as compared with the case where the exhaust pipe passes below the engine.

Further, in the above structure, the exhaust pipe extending rearward of the vehicle body through the recess of the oil pan may interfere with the front wheel differential. Since the gear is offset on the side opposite to the position through which the exhaust pipe passes, interference with the exhaust pipe can be avoided and it is not necessary to bend the exhaust pipe specifically.

[0011]

As described above, according to the powertrain structure for a vehicle of the first aspect of the present invention, the exhaust pipe is utilized by utilizing the space located behind the vehicle body of the horizontal engine and on the side of the transmission. Was extended from the front side of the horizontal engine to the rear of the vehicle through the above-mentioned space through a specially formed recess in the oil pan. The directional length can be shortened.

According to the second aspect of the present invention, the differential gear portion located at a position where it interferes with the exhaust pipe passing laterally of the transmission is opposite to the position of the exhaust pipe with respect to the final gear. Since it is offset to the side, interference between the exhaust pipe and the differential can be avoided.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

1, 2 and 3 show a powertrain structure for a front-wheel drive vehicle. In the figure, 1 is a bonnet forming part of the vehicle body, 2 is a dash panel,
The dash panel 2 forms an engine room 3 on the front side of the vehicle body on the side of the hood 1 and a vehicle room 4 on the opposite side.

Inside the engine room 3, a radiator 6 is arranged on the front side of the vehicle body, and an engine 7 is arranged behind it. The engine 7 has its crankshaft 8
Is placed horizontally in the vehicle width direction.

At the rear of the vehicle body of the engine 7, there are two upper and lower parts.
A two-shaft transmission 12 having two shafts 12a and 12b,
The shafts 12a and 12b are arranged in parallel with the crankshaft 8 of the engine 7, and the front wheel differential 15 is arranged obliquely below and rearward of the transmission 12 when viewed from the side of the vehicle body. There is. Left and right front wheels W are connected to the differential 15 via left and right front axles 32a and 32b.

As shown in FIG. 1, the specific layout of the power train is as shown in FIG.
The transmission 1 is located rearward and upward with respect to the axis P1 of the vehicle.
The axis P2 of the upper shaft 12a of 2 is set, and the axis P2
A shaft center P3 of the lower shaft 12b is set below the rear of the vehicle body. The axis P4 of the differential 15 is set below the axis P3 of the lower shaft 12b of the transmission 12 and behind the vehicle body.

Further, as shown in FIG. 3, a large-diameter clutch 20 for transmitting power from the engine 7 to the transmission 12 is arranged at one end of the crankshaft 8 of the engine 7. The clutch 20 is rotatably and integrally supported by a support disc 20a rotatably and integrally connected to the crankshaft 8 and a shaft 16 disposed so as to face the support disc 20a and aligned with the crankshaft 8. Disc 20b and the clutch disc 2
0b against the support disc 20a. A drive sprocket 21 is connected to the shaft 16, while a driven sprocket 22 is attached to the upper shaft 12 a of the transmission 12.
Are connected integrally with each other, and a chain 23 is wound around the sprockets 21 and 22. With this configuration, when the clutch 20 is engaged, the power of the engine 7 is transmitted from the crankshaft 8 to the upper shaft 12a of the transmission 12, and when the clutch 20 is disengaged, the transmission of the power is cut off.

The upper shaft 12a of the transmission 12 and the lower shaft 1
A gear train 30 for speed change is disposed between the gears 2b and 2b, and an output gear 31 is connected to the lower shaft 12b so as to rotate integrally therewith, and the rotation of the output gear 31 is for a front wheel of a bevel gear type. It is transmitted to the differential 15. The differential 15 divides the power into left and right, and the front axle 32
It is configured to be transmitted to the left and right front wheels W via a and 32b.

As shown in FIG. 1, the engine 7 is arranged so as to be inclined toward the front of the vehicle body, and the intake port 9 is located on the rear side of the vehicle body and the exhaust port 10 is located on the front side of the vehicle body. Are arranged as follows. In addition, as shown in FIG. 2, the transmission 12 is arranged so that the position of the left end of the engine 7 at the rear of the engine 7 matches the position of the left end of the engine 7.
It is located close to the left side of. Further, as shown in FIG. 4, the oil pan 11 located under the engine 7 is
A recessed portion 13 recessed upward is formed in a portion other than the portion corresponding to the portion where the transmission 12 is located, that is, in the right side portion.

An exhaust manifold 39 is connected to the exhaust port 10 located in the front portion of the engine 7, and an exhaust pipe 40 is connected to the collecting portion of the exhaust manifold 39. The reference numeral 40 extends downward to the right side of the engine 7, then bends rearward of the vehicle body, passes through the left end of the recess 13 of the oil pan 11 of the engine 7, and reaches the space 14 on the right side of the transmission 12, Further, after being slightly bent toward the center of the vehicle body at the rear end of the clutch 20, the clutch 20 extends horizontally further to the rear of the vehicle, and an exhaust gas purification device 41 is arranged in the horizontal portion.

On the other hand, a surge tank 43 is arranged in a space diagonally above and behind the engine 7, and a plurality of (four) independent intake passages 46 corresponding to each cylinder are provided at the rear of the surge tank 43. The independent intake passages 46 are connected to each other, extend downward, and are bent obliquely forward to communicate with the intake ports 9 of the cylinders of the engine 7.

Further, as shown in FIG. 2, the front wheel differential 15 is arranged at a substantially central portion in the vehicle width direction. Therefore, in order to prevent the differential pipe 15 from interfering with the exhaust pipe 40 passing near the central portion in the vehicle width direction, the differential gear 15 has a final gear 15a formed in a recess of the oil pan 11 as shown in FIG. Although located directly to the left of 13, the gear portion 15b is arranged offset with respect to the final gear 15a on the left side of the vehicle body, that is, on the side opposite to the side on which the exhaust pipe 40 is located.

In FIG. 1, 47 is a fuel injection valve arranged in each independent intake passage 46. Therefore, in the above-described embodiment, since the transmission 12 is arranged in parallel behind the vehicle of the horizontal engine 7, the power train is shortened in the vehicle front-rear direction and the vehicle width direction.

In this case, the exhaust pipe 40 extends downward from the front side of the engine 7, then faces the vehicle body rearward through the recess 13 formed in the oil pan 11, and passes through the space 14 on the right side of the transmission 12 to the vehicle body. It extends backwards. Therefore, as compared with the case where the exhaust pipe is passed under the engine 7, the oil pan 11
The length of the exhaust pipe 40 can be shortened by the amount of passing through the recess 13, and the vertical length of the power train can be shortened.

Moreover, although the differential 15 is located close to the left side of the exhaust pipe 40, the gear portion 15b of the differential 15 is positioned relative to the final gear 15a. Since it is offset to the left on the opposite side to the exhaust pipe 40
And the differential 15 are prevented from interfering with each other,
It is not necessary to bend the exhaust pipe 40 uniquely.

Although the clutch 20 is used as an element for transmitting the power of the engine 7 to the transmission 12 in the above-mentioned embodiment, it goes without saying that a torque converter may be used.

[Brief description of drawings]

FIG. 1 is a side view showing an arrangement state of a power train in a front part of a vehicle body.

FIG. 2 is a plan view of the same.

FIG. 3 is a skeleton diagram of a power train.

FIG. 4 is an enlarged view of the vicinity of the differential as viewed from the rear of the vehicle body.

[Explanation of symbols]

 3 engine room 7 engine 8 crankshaft 11 oil pan 12 transmission 13 recess 15 differential 15a final gear 15b gear

Claims (2)

[Claims] 1. A powertrain structure for a vehicle in which an engine is horizontally arranged in an engine room at a front part of a vehicle body and a transmission is arranged in parallel behind the engine in parallel with a crankshaft of the engine. The engine is arranged so that the exhaust port is located on the front side of the vehicle body, and the oil pan of the engine is provided with a recess in a portion other than the portion corresponding to the portion where the transmission is located. The exhaust pipe communicating with the exhaust port extends rearward of the vehicle body through the recess of the oil pan. 2. A differential is disposed at the rear of the vehicle body of the transmission, and the differential has a gear portion offset from the side where the exhaust pipe is located with respect to the final gear. Item 1. A vehicle powertrain structure according to item 1.