JPH0542834A - Power train structure of vehicle - Google Patents

Abstract

PURPOSE:To prevent the front portion of a vehicle from becoming heavy when disposing a clutch with respect to the upper shaft of a transmission by disposing behind an engine a two-shaft type transmission and a differential gear for front wheels. CONSTITUTION:An engine 7 is tilted and disposed in the rear poriton of a vehicle body and an exhaust port 10 is disposed in the rear side of the vehicle body. An exhaust pipe 40 for connection to the exhaust port 10 of the engine 7 is disposed in such a way as being extended directly from the exhaust port 10 to the rear side of the vehicle body. The center of loads of the whole power train is thus set at the rear side of the vehicle body and so loads exerted on front wheels W are reduced as much as possible and the front portion of the vehicle body is prevented from becoming heavy.

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 vehicle having a differential for driving front wheels in an engine room.

[0002]

2. Description of the Related Art Conventionally, as a powertrain structure for a vehicle of this type, as disclosed in, for example, Japanese Patent Laid-Open No. 1-313630, an engine is arranged horizontally in an engine room at the front of the vehicle body. By arranging the transmission behind the engine body in parallel with the crankshaft of the engine in parallel with the axis, and by arranging the front wheel differential in the vehicle body up and down direction behind the engine, these powers can be obtained. The train is compactly arranged in the front-rear direction and the width direction of the vehicle body, and the type of the transmission is a two-shaft type having two shafts arranged in the vertical direction, and the train is located above the transmission. It is known that a clutch is disposed in the vehicle to raise its height position so that the clutch does not interfere with the front axle positioned below the clutch.

[0003]

However, in view of the load acting on the front wheels, in the above-mentioned conventional one, since the engine is located in front of the front wheel differential, the front wheel load becomes large, and so-called front heavy There is a drawback.

The present invention has been made in view of the above problems, and an object thereof is to arrange a two-shaft transmission and a differential vertically in parallel in the vehicle body rear side of the engine as described above, and to perform the two-shaft transmission. In a power train structure in which a clutch or a torque converter is arranged on the upper shaft of the machine, it is to reduce the load acting on the front wheels as much as possible.

[0005]

In order to achieve the above object, in the invention according to the present application, the load center of the entire engine including the intake pipe and the exhaust pipe of the engine is set to the rear of the vehicle body as much as possible. ..

That is, the concrete solution of the invention according to claim 1 is to arrange the engine horizontally in the engine room at the front of the vehicle body, and to arrange the transmission behind the vehicle body of the engine. The crankshaft and the shaft are arranged in parallel with each other in parallel, a differential is further arranged at the rear of the vehicle body of the engine, and the transmission is composed of a two-axis type vertically arranged in the vehicle body. It is premised on a power train structure of a vehicle in which a clutch or a torque converter for transmitting power from the engine to the transmission is arranged on a shaft located above the vehicle body of the machine. The engine is arranged so as to be inclined rearward of the vehicle body, the exhaust port is disposed so as to be located on the rear side of the vehicle body, and an exhaust pipe extending rearward of the vehicle body is connected to the exhaust port. I am trying.

According to the second aspect of the invention, the first aspect is
All the configurations of the invention described above are provided, and the intake pipe of the engine is arranged above the engine or behind the vehicle body.

Further, in the invention described in claim 3, on the same premise as the invention described in claim 1, the intake pipe of the engine is arranged above the engine or behind the vehicle body. In addition, according to the invention described in claim 4, on the same premise as the invention described in claim 1, the engine is arranged to be inclined forward of the vehicle body, and the exhaust port is located on the vehicle front side. Even in such a case, the exhaust pipe communicating with the exhaust port is configured to extend rearward of the vehicle body, passing under the clutch or the torque converter.

[0009]

With the above construction, in the invention of claim 1,
In the differential, the engine is arranged in front of the vehicle body. However, since the engine is inclined rearward of the vehicle body, the load center of the engine moves to the rear side of the vehicle body as compared with the case where the engine is arranged upright. Further, since the exhaust pipe is connected to the exhaust port located on the rear side of the vehicle body and the exhaust pipe extends directly rearward from the exhaust port, the exhaust port is located on the front side of the vehicle body. As compared with the case where the exhaust pipe extends to the front of the vehicle body and then bends to extend to the rear of the vehicle body, the load center of the entire engine moves to the rear of the vehicle body. Therefore, so-called front heavy is suppressed.

In this case, according to the second aspect of the invention, in addition to the rearward inclination of the engine and the rearward arrangement of the exhaust pipe, the intake pipe is further arranged above the engine or rearward of the vehicle body.
The center of load of the entire engine is set further toward the rear of the vehicle body, and the front heavy is effectively suppressed.

Further, according to the third aspect of the present invention, the intake pipe is arranged above the engine or behind the vehicle body, and the load center of the entire engine is set to the rear side of the vehicle body by that amount, so that the front heavy is suppressed. It

In addition, in the invention according to claim 4, when it is premised that the engine is inclined forward of the vehicle body and the exhaust pipe is also positioned forward of the engine, the center of load of the entire engine is set forward of the vehicle body. However, since the exhaust pipe is arranged to extend rearward of the vehicle body through the empty space below the clutch, the exhaust pipe length is shortened as compared with the case where the exhaust pipe extends rearwardly of the vehicle body below the engine as usual. The weight of the exhaust pipe located in front of the vehicle body of the front axle is reduced. As a result, the load center of the entire engine is set to the rear of the vehicle body by that amount, so that the front heavy is suppressed.

[0013]

As described above, according to the first aspect of the invention, the two-shaft transmission is arranged in parallel behind the vehicle body of the transversely mounted engine and the differential is arranged, and the upper shaft of the transmission is provided with the two-shaft transmission. Even with a structure in which a clutch or a torque converter is arranged, the load center of the entire engine can be set rearward of the vehicle body by the rearward inclination of the engine and the rearward arrangement of the exhaust pipe, so that the load acting on the front wheels is reduced accordingly. As a result, front heavy can be suppressed, and the drivability of the vehicle can be improved.

According to the invention of claim 2, in addition to the structure of the invention of claim 1, the intake pipe of the engine is arranged above or behind the engine, so that the load center of the entire engine is further improved. It can be set to the rear of the vehicle body, further suppressing the front heavy and improving the drivability of the vehicle.

Further, according to the invention of claim 3, the intake pipe of the engine is arranged above or behind the engine on the same premise as that of the invention of claim 1, and accordingly,
The load acting on the front wheels can be reduced to suppress the front heavy, and the drivability of the vehicle can be improved.

In addition, according to the invention as set forth in claim 4, even when the exhaust pipe is connected to the front side of the engine in the forward leaning engine, the exhaust pipe is provided with an empty space below the clutch or the torque converter. Since it is arranged so as to extend to the rear of the vehicle body, the length of the exhaust pipe located on the front side of the engine is shortened compared to the case where the exhaust pipe is arranged so as to pass under the engine, and the load acting on the front wheels is correspondingly reduced. The front heavy can be suppressed as much as possible.

[0017]

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

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

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 disposed horizontally in the vehicle width direction, and the intake port 9 is disposed on the front side of the vehicle body and the exhaust port 10 is disposed on the rear side of the vehicle body.

A two-shaft transmission 12 having two shafts 12a and 12b is provided behind the engine 7 in the vehicle body, and the shafts 12a and 12b are connected to the crankshaft 8 of the engine 7.
The front wheel differential 15 is disposed in parallel with the vehicle body, and is located immediately below the transmission 12 when viewed from the side of the vehicle body. Left and right front wheels W are attached to the differential 15 via a front axle (not shown).
Are connected.

The specific arrangement of the power train is as follows. The shaft 1 on the upper side of the transmission 12 is obliquely upward and rearward of the vehicle body with respect to the axis P1 of the crankshaft 8 of the engine 7.
The shaft center P2 of 2a is set and the lower shaft 12 of the transmission 12 is set.
The axis P3 of b is set diagonally below and rearward of the axis P2 of the upper shaft 12a. Also, differential 1
The shaft center P4 of 5 is the shaft center P2 of the upper shaft of the transmission 12.
And the axis P3 of the lower shaft.

Further, as shown in FIG. 1, the transmission 12
A large-diameter clutch 20 is disposed on the shaft 12a on the upper side of the engine 20.
Are linked by a chain 21 wound around them, and when the clutch 20 is engaged, the engine 7
Is transmitted from the crankshaft 8 to the upper shaft 12a of the transmission 12, and the transmission of the power is cut off when the clutch 20 is released.

Next, the structure and connection of the power train will be described with reference to the skeleton diagram of FIG.

In the figure, the drive sprocket 25 is connected to one end of the crankshaft 8 of the engine 7 so as to rotate integrally therewith, while the upper shaft 12a of the transmission 12 is connected.
A driven sprocket 26 is rotatably connected to the intermediate shaft 12c arranged in line with the sprocket 2
The chain 21 is wound around 5, 26. Further, on the upper shaft 12a of the transmission 12, the clutch 2 is provided at the end portion on the driven sprocket 26 side.
0 is connected. The clutch 20 is rotatably coupled to the intermediate shaft 12c of the transmission 12, and is disposed to face the support disc 20a and is rotationally integrally coupled to the upper shaft 12a of the transmission 12. Clutch disc 20b and the clutch disc 2
0b against the support disc 20a.

A gear train 30 for shifting is arranged between the upper shaft 12a and the lower shaft 12b of the transmission 12. An output gear 31 is disposed on the lower shaft 12b, and the output gear 31 is transmitted to the bevel gear type front wheel differential 15. The differential 1
The power is divided into left and right at 5, and front axles 32a, 32 are respectively
It is configured to be transmitted to the left and right front wheels W via b.

As shown in FIGS. 1 and 2, the engine 7 is arranged so as to be inclined rearward of the vehicle body, and an exhaust manifold is provided in each exhaust port 10 located rearward of the engine 7. 39 is connected, and an exhaust pipe 40 is connected to the collecting portion 39 a of the exhaust manifold 39. The exhaust pipe 40 extends diagonally downward and rearward of the vehicle body along the rear side of the vehicle body of the transmission 12 and the differential 15, and then horizontally extends rearward of the vehicle body. 41 is provided.

A surge tank 43 is arranged in a space located immediately above the upper portion of the engine 7, that is, above the differential 15 in FIG.
A throttle valve unit 44 is arranged on the side of the vehicle body of
A collective intake pipe 45 is connected to the throttle valve unit 44, and the collective intake pipe 45 passes directly above the clutch 20 and faces the front of the vehicle body. In addition, the surge tank 43
On the front side of the vehicle body, a plurality of (four) independent intake passages 46 corresponding to the respective cylinders are connected. The independent intake passages 46 extend forward of the vehicle body and then bend downward and It communicates with the intake port 9.

In FIG. 1, 47 is a fuel injection valve arranged in each independent intake passage 46. Therefore, in the above-described embodiment, since the two-shaft type transmission 12 is arranged in parallel behind the vehicle body of the engine 7 and the differential 15 is arranged, the length in the vehicle front-rear direction and the vehicle width direction is shortened. It Moreover, the upper shaft 12a of the transmission 12
Since the clutch 20 is arranged in contrast to this, the height position thereof is high, and there is no interference with the axles 32a, 32b located below the clutch 20.

In this case, since the engine 7 is located in front of the differential 15 with respect to the vehicle body, a large amount of vehicle weight is applied to the front wheels W and the vehicle is apt to become a front heavy vehicle. However, since the engine 7 is inclined rearward of the vehicle body, the load center of the engine 7 is set rearward of the vehicle body, and the exhaust port 10 of the engine 7 is located rearward of the vehicle body. -Because the exhaust pipe 40 is connected to the port 10, the exhaust pipe 40 is arranged so as to directly extend from the rear side of the vehicle body of the engine 7 to the rear side of the vehicle body, and the exhaust port 10 is located on the front side of the vehicle body. As described above, the exhaust pipe 40 does not exist in front of the engine 7. Therefore, by setting the rear of the load center of the engine 7 and disposing the exhaust pipe 40 only behind the engine 7,
Accordingly, the load applied to the front wheels W is reduced, the front heavy is effectively suppressed, and the drivability is improved.

Moreover, although the intake port 9 of the engine 7 is located on the front side of the vehicle body, the surge tank 43 is arranged in a space immediately above the upper portion of the engine 7 and above the differential 15 to provide independent intake air. Since the pipe 46 is also arranged above the engine 7 toward the surge tank 43, the load center of the engine 7 as a whole is set further rearward of the vehicle body. Therefore, the front heavy is further suppressed.

FIG. 4 shows a second embodiment. In the present embodiment, since the engine 7'is arranged to incline toward the front of the vehicle body, a larger load acts on the front wheels W accordingly. However, the surge tank 43 'is arranged in a space diagonally above and behind the upper vehicle body of the engine 7'. Therefore,
The load center of the entire engine 7'can be set to the rear of the vehicle body as compared with the case where it is arranged immediately above the upper part of the engine 7 ', and front heavy is suppressed as much as possible.

In this embodiment, since the engine 7'is inclined forward of the vehicle body, the shaft center P4 of the differential 15 is the shaft center P3 of the lower shaft 12b of the transmission 12 as shown in FIG. It is located behind the vehicle. Further, as shown in FIG. 5, the exhaust pipe 40 ′ extends rearward of the vehicle body through the lateral side of the differential 15 to avoid interference with the differential 15. Since the other structure is the same as that of the above-described embodiment, the same parts are designated by the same reference numerals and the description thereof will be omitted.

6 and 7 show a third embodiment. In this embodiment, the engine 7 ″ is arranged to be inclined toward the front of the vehicle body, and the exhaust port 10 ″ is arranged to be located on the front side of the vehicle body. Therefore, the exhaust pipe 40 ″ extends downward from the vehicle body front side of the exhaust port 10 ″ while facing the side of the engine 7 ″ and the side where the clutch 20 is located, as shown in FIG. , A space 4 that curves gently to the rear of the vehicle body and is located below the clutch 20 on the side of the engine 7 ″
5, it extends toward the rear of the vehicle body, further toward the center of the vehicle width direction at the position of the differential 15, as shown in FIG.

Further, a surge tank 43 '' is arranged at a site laterally above the engine 7 '', and an independent intake pipe 46 '' extends downward from the rear of the surge tank 43 ''. In addition, it curves to the front of the vehicle body and communicates with the intake port 9 '' on the rear side of the engine 7 ''.

Therefore, in this embodiment, since the engine 7 "is inclined to the front of the vehicle body and the exhaust pipe 40" is connected to the exhaust port 10 "located on the front side of the vehicle body, Although a large load acts on the wheel W and becomes a front heavy, since the exhaust pipe 40 ″ extends to the rear of the vehicle body at the side of the engine 7 ″ and through the empty space 45 below the clutch 20, the exhaust pipe is used as an engine. As compared with the case where the exhaust pipe 40 ″ is extended to the rear of the vehicle through the lower part, the total length of the exhaust pipe 40 ″ can be shortened and the exhaust pipe portion located in front of the engine 7 ″ can be shortened. As a result, the load center of the entire engine 7 ″ can be set to the rear of the vehicle body as much as possible, so that the above-mentioned front heavy can be alleviated. Moreover, the empty space 4 below the clutch 20
Since 5 is used, this space 45 is effectively used,
The entire power train can be made compact.

In the above description, the engines 7, 7 ',
Although the clutch 20 is used as an element for transmitting the power of 7 ″ to the transmission 12, it goes without saying that a torque converter may be used instead.

[Brief description of drawings]

FIG. 1 is a side view of an arrangement position of a power train showing a first embodiment.

FIG. 2 is a plan view of the same.

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

FIG. 4 is a side view of an arrangement position of a power train showing a second embodiment.

FIG. 5 is a plan view of the same.

FIG. 6 is a side view of an arrangement position of a power train showing a third embodiment.

FIG. 7 is a plan view of the same.

[Explanation of symbols]

 3 engine room 7, 7 ', 7' 'engine 10, 10', 10 '' exhaust port 12 transmission 12a upper shaft 12b lower shaft 15 front wheel differential W front wheel 20 clutch 40, 40 ', 40 '' exhaust pipe 43, 43 ', 43' 'surge tank 46, 46' 'independent intake pipe

Claims (4)

[Claims] 1. An engine is laterally arranged in an engine room at the front of a vehicle body, and a transmission is arranged in parallel behind the vehicle body of the engine in parallel with the crankshaft of the engine in parallel with its axis. A differential is arranged in the rear of the vehicle body of the engine, and the transmission is composed of a two-shaft type which is arranged in a vertical direction of the vehicle body. The shaft located above the vehicle body of the two-shaft transmission is connected to the engine from the engine. In a vehicle powertrain structure in which a clutch or a torque converter for transmitting power to the transmission is arranged,
The engine is arranged so as to be inclined rearward of the vehicle body, and the exhaust port is disposed so as to be located on the rear side of the vehicle body, and an exhaust pipe extending rearward of the vehicle body is connected to the exhaust port. The powertrain structure of the vehicle characterized by. 2. The powertrain structure for a vehicle according to claim 1, wherein an intake pipe of the engine is arranged above the engine or behind the vehicle body. 3. An engine is disposed horizontally in an engine room at the front of a vehicle body, and a transmission is disposed in parallel behind the vehicle body of the engine in parallel with the crankshaft of the engine in parallel with its axis. A differential is arranged in the rear of the vehicle body of the engine, and the transmission is composed of a two-shaft type which is arranged in a vertical direction of the vehicle body. The shaft located above the vehicle body of the two-shaft transmission is connected to the engine from the engine. In a vehicle powertrain structure in which a clutch or a torque converter for transmitting power to the transmission is arranged,
A powertrain structure for a vehicle, wherein an intake pipe of the engine is arranged above the engine or behind the vehicle body. 4. An engine is disposed horizontally in an engine room in the front of a vehicle body, and a transmission is disposed in parallel behind the vehicle body of the engine with the crankshaft of the engine parallel to the axis. A differential is arranged in the rear of the vehicle body of the engine, and the transmission is composed of a two-shaft type which is arranged in a vertical direction of the vehicle body. The shaft located above the vehicle body of the two-shaft transmission is connected to the engine from the engine. In a vehicle powertrain structure in which a clutch or a torque converter for transmitting power to the transmission is arranged,
The engine is arranged so as to be inclined forward of the vehicle body, and the exhaust port is arranged so as to be located on the front side of the vehicle body. The exhaust pipe communicating with the exhaust port is the clutch or the torque converter. A powertrain structure for a vehicle, which extends to the rear of the vehicle body through a lower portion of the vehicle.