JP3004376B2 - Vehicle powertrain structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power train structure for a vehicle, and more particularly to an improvement in a vehicle in which an engine is disposed horizontally.

[0002]

2. Description of the Related Art Conventionally, as a power train structure for a vehicle of this type, for example, as disclosed in Japanese Utility Model Publication No. 48-22887, a crankshaft of an engine is provided in an engine room at a front portion of a vehicle body in a vehicle width direction. The power train is compactly arranged in the front-rear direction and width direction of the vehicle body by arranging the transmission in parallel with the engine's crankshaft and axis parallel to the rear of the engine body. A short arrangement is known.

In the above publication, an exhaust port is located on the front side of the vehicle body of the engine, and an exhaust pipe communicating with the exhaust port is extended downward from the front of the engine on the exhaust port side. And extend to the rear of the vehicle body.

[0004]

However, in the above-mentioned conventional vehicle, 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. There is a drawback in that the height position of the hood of the vehicle is increased correspondingly when trying to secure the minimum ground clearance.

[0005] The present invention has been made in view of the above points, and an object of the present invention is to provide a power train structure in which a transverse engine having an exhaust port located on the front side and a transmission are arranged in parallel as described above. It is an object of the present invention to reduce the length of the exhaust pipe and the length of the power train in the vertical direction by appropriately arranging the exhaust pipe using an empty space in the engine room. In that case, taking into account the interference between the equipment installed in the engine room and the exhaust pipe, the arrangement of the equipment that interferes is appropriately changed, and the appropriate arrangement of the exhaust pipe is ensured.

[0006]

In order to achieve the above object, according to the invention of the present application, the length of each of the transverse engine and the transmission in the vehicle width direction is different, and the transmission is shorter. Paying attention, a part of the oil pan is depressed in an engine portion where the transmission is not located, and an exhaust pipe is arranged in this depressed portion. Further, 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, a specific solution of the invention according to claim 1 is that an engine is arranged horizontally in an engine room at a front portion of a vehicle body, and a transmission is provided behind the engine in the engine room. It is assumed that the vehicle has a powertrain structure arranged in parallel with the crankshaft. The engine is arranged such that the exhaust port is located on the front side of the vehicle body. Further, the transmission is shifted toward one end of the engine in the axial direction of the crankshaft to allow the engine and the transmission to overlap in the vehicle longitudinal direction, and a portion where the engine and the transmission do not overlap is provided at the other end of the engine. In addition, a recess having a high bottom and extending from the front side of the oil pan to the rear side of the oil pan is formed in a portion of the oil pan joined below the engine where the engine and the transmission do not overlap when viewed from the front of the vehicle body. The exhaust pipe communicating with the exhaust port extends rearward of the vehicle body through the recess of the oil pan.

[0008] A specific solution of the invention according to claim 2 is to provide all of the features of the invention according to claim 1 and to further provide a case where a differential is disposed behind the vehicle body of the transmission. The differential gear is offset from the final gear on the side opposite to the side where the exhaust pipe is located.

[0009]

According to the above-mentioned structure, according to the first aspect of the present invention,
Assuming a powertrain structure in which a transmission is arranged in parallel behind the body of the 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 oil pan portion of the engine At the height of the vehicle, and after passing through the concave portion of the oil pan, extends to the rear of the vehicle body through the side of the transmission. Therefore, since the exhaust pipe is not located below the bottom of the oil pan, the length of the exhaust pipe is reduced and the length of the power train in the vertical direction is reduced as compared with the case where the exhaust pipe passes below the engine.

In the above construction, 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 to the opposite side of the position where the exhaust pipe passes, interference with the exhaust pipe can be avoided, and the exhaust pipe does not need to be bent uniquely.

[0011]

As described above, according to the vehicle power train structure of the first aspect of the invention, the exhaust pipe is utilized by utilizing the space located behind the vehicle body of the horizontal engine and beside the transmission. From the front of the horizontal engine to the rear of the car body through the above space through a specially formed recess in the oil pan, so that the exhaust pipe goes up and down the power train compared to the one that passes below the horizontal engine. The length in the direction can be reduced.

According to the second aspect of the present invention, the differential gear located at a position where the differential gear interferes with the exhaust pipe passing laterally of the transmission is opposite to the position of the exhaust pipe relative 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.

FIGS. 1, 2 and 3 show a power train structure for a front wheel drive vehicle. In the figure, reference numeral 1 denotes a hood forming a part of the vehicle body, 2 denotes a dash panel,
The dash panel 2 forms an engine room 3 at the front of the vehicle body on the bonnet 1 side, and a vehicle room 4 at the opposite side.

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

Behind the body of the engine 7, two vertically
A two-shaft transmission 12 having two shafts 12a and 12b
The shafts 12a and 12b are disposed in parallel with the crankshaft 8 of the engine 7, and a front wheel differential 15 is disposed obliquely below and behind the transmission 12 when viewed from the side of the vehicle body. I have. Left and right front wheels W are connected to the differential 15 via left and right front axles 32a and 32b.

The specific arrangement of the power train is shown in FIG.
The transmission 1 is located rearward and above the vehicle body with respect to the axis P1 of the transmission 1.
The axis P2 of the upper shaft 12a is set, and the axis P2
The shaft center P3 of the lower shaft 12b is set below and behind 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 at the rear of the vehicle body.

As shown in FIG. 3, a large-diameter clutch 20 for transmitting power from the engine 7 to the transmission 12 is disposed at one end of the crankshaft 8 of the engine 7. The clutch 20 includes a support disk 20 a rotatably connected to the crankshaft 8, and a clutch rotatably supported by a shaft 16 disposed opposite to the support disk 20 a and aligned with the crankshaft 8. Disc 20b and the clutch disc 2
0b against the support disk 20a. A drive sprocket 21 is connected to the shaft 16, while a driven sprocket 22 is connected to the shaft 12 a on the upper side of the transmission 12.
Are connected integrally with each other, and a chain 23 is wound between 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 released, the transmission of the power is cut off.

The upper shaft 12a of the transmission 12 and the lower shaft 1
A transmission gear train 30 is disposed between the front gear 2b and the lower shaft 12b, and an output gear 31 is integrally connected to the lower shaft 12b. It is transmitted to the differential 15. The power is split right and left by the differential 15, 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 disposed so as to be inclined forward of the vehicle body, and the intake port 9 is disposed at the rear side of the vehicle body and the exhaust port 10 is disposed at the front side of the vehicle body. ing. Further, as shown in FIG. 2, the transmission 12 is configured such that the position of the left end behind the engine 7 matches the position of the left end of the engine 7.
It is arranged to the left side of. Further, as shown in FIG. 4, the oil pan 11 located below the engine 7 has:
A recess 13 which is depressed 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 portion.

An exhaust manifold 39 is connected to the exhaust port 10 located on the front side of the engine 7, and an exhaust pipe 40 is connected and connected to a collection of the exhaust manifold 39. After extending to the right side of the engine 7 while extending downward, it bends rearward of the vehicle body, passes through the left end of the concave portion 13 of the oil pan 11 of the engine 7, reaches the space 14 on the right side of the transmission 12, and further engages the clutch. After slightly bending toward the center of the vehicle body at the rear end of the vehicle 20, it further extends horizontally to the rear of the vehicle body, and an exhaust purification device 41 is disposed in the horizontal portion.

On the other hand, a surge tank 43 is disposed in a space obliquely above the rear of the engine 7, and a plurality (four) independent intake passages 46 corresponding to each cylinder are provided at the rear of the surge tank 43. Each of the independent intake passages 46 extends downward, and then bends obliquely forward to communicate with the intake port 9 of each cylinder of the engine 7.

Further, as shown in FIG. 2, the front wheel differential 15 is disposed substantially at the center in the vehicle width direction. Therefore, in order to prevent interference between the exhaust pipe 40 passing through the vicinity of the center portion in the vehicle width direction and the differential 15, the differential 15 is provided with a final gear 15a as shown in FIG. 13, the gear portion 15 b is offset from the final gear 15 a on the left side of the vehicle body, that is, on the side opposite to the side where the exhaust pipe 40 is located.

In FIG. 1, reference numeral 47 denotes a fuel injection valve arranged in each independent intake passage 46.

Therefore, in the above-described embodiment, the transmission 12 is arranged in parallel behind the vehicle body of the horizontal engine 7, so that the power train is shortened in the vehicle longitudinal 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 rear of the vehicle body via the concave portion 13 formed in the oil pan 11, passes through the space 14 on the right side of the transmission 12, and Extending backwards. Therefore, compared to the case where the exhaust pipe passes below the engine 7, the oil pan 11
The length of the exhaust pipe 40 can be shortened and the length of the power train in the vertical direction can be reduced by the amount corresponding to the passage through the concave portion 13.

Further, on the left side of the exhaust pipe 40, although the differential 15 is positioned close to the exhaust pipe 40, the gear portion 15b of the differential 15 is positioned relative to the final gear 15a. Offset to the left on the opposite side of the exhaust pipe 40
And the differential 15 are prevented from interfering with each other,
There is no need to specifically bend the exhaust pipe 40.

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

[Brief description of the drawings]

FIG. 1 is a side view showing an arrangement state of a power train in a front portion 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]

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

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-34730 (JP, U) JP-A 48-22887 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) B60K 17/00-17/36 F02B 67/00

Claims (2)

(57) [Claims] 1. A power train structure for a vehicle in which an engine is horizontally disposed in an engine room at a front portion of a vehicle body, and a transmission is arranged behind and behind the engine in parallel with a crankshaft of the engine. The engine is disposed such that an exhaust port is located on a front side of the vehicle body , and one end of the engine in an axial direction of the crankshaft.
Shift the engine to the engine in the vehicle longitudinal direction
The engine and the other end of the engine
A part that does not overlap with the machine is formed, and
From the viewpoint of the oil pan that is joined below the engine
At the part where the engine and transmission do not overlap,
A recess is formed that extends from the front side of the
Have been, an exhaust pipe communicating with the exhaust port, power train structure of a vehicle, characterized in Tei Rukoto extends toward the rear of the vehicle body through the recess portion 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 a final gear on a side opposite to a side where the exhaust pipe is located. Item 4. A powertrain structure for a vehicle according to Item 1.