JPH0825987A - Power train arrangement structure for vehicle - Google Patents

Abstract

PURPOSE:To arrange a cross member after saving space without any interference with an engine and other power train constituent elements, and minimize the harmful thermal effect of an engine exhaust system on an engine intake system or a floor panel, regarding a power train arrangement structure with an engine laid under the floor panel. CONSTITUTION:An engine is horizontally mounted and an intake port 68 and an exhaust port 70 are provided on the lower end thereof. As a result, a sufficient gap can be maintained between an exhaust member (exhaust manifold 80 in particular) jointed to the exhaust port 70, and a floor panel 52a, thereby minimizing a harmful thermal effect on the floor panel 52. Furthermore, both ports 68 and 70 are provided at the preset intervals along a longitudinal direction, and a cross member 58 is laid between both ports 68 and 70 under the engine. According to this construction, a power train can be arranged, so as to prevent interference and save space, and a harmful thermal effect on an engine intake system is minimized, due to the existence of the cross member 58.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powertrain disposition structure for an automobile in which an engine having a drive shaft extending in the vehicle width direction is disposed below a floor panel forming a floor surface of a vehicle compartment. .

[0002]

2. Description of the Related Art Since power train components such as an engine and a transmission occupy a large portion of the vehicle weight, it is preferable to bring them closer to the center of gravity of the vehicle in order to reduce the yaw moment of inertia of the vehicle. Therefore, conventionally, as disclosed in, for example, Japanese Utility Model Laid-Open No. 63-159322, the power train component is arranged below the floor panel constituting the floor surface of the passenger compartment, and the power train component is thereby arranged. The device is designed to approach the center of gravity of the vehicle.

[0003]

However, when the power train component is arranged below the floor panel as described above, a cross for supporting the power train component on the vehicle body or for securing the vehicle body strength. Although it is necessary to dispose the member below the floor panel, it is not easy to secure a sufficient space for disposing the powertrain components below the floor panel.
It is also not easy to place crossmembers without interfering with these powertrain components. Also, when the powertrain components are installed below the floor panel, the heat generated from the engine exhaust system tends to be trapped below the floor panel, so the effect of heat damage to the engine intake system and floor panel should be minimized. It is desirable to devise.

The present invention has been made in view of the above circumstances, and in a vehicle in which an engine is arranged below a floor panel, the cross member can be saved without interfering with the engine and other power train components. It is an object of the present invention to provide a powertrain arrangement structure that can be arranged in a space-saving manner and that can minimize the influence of heat damage from the engine exhaust system to the engine intake system and floor panel. To do.

[0005]

DISCLOSURE OF THE INVENTION The present invention is a vehicle having a so-called horizontal engine (for example, Japanese Patent Laid-Open No. 4-4682).
In the case of Japanese Patent Laid-Open No. 4), attention is paid to the fact that the intake system and the exhaust system of the engine can be arranged separately in the front and rear, and the following configuration is adopted to achieve the above object.

That is, according to the present invention, as described in claim 1, below the floor panel constituting the floor surface of the passenger compartment,
A powertrain disposition structure in an automobile in which an engine having a drive shaft extending in a vehicle width direction is disposed, wherein an intake port and an exhaust port are provided at a lower end portion of the engine at predetermined intervals in a vehicle front-rear direction. And extending between the ports below the engine in the vehicle width direction
The cross member is provided.

[0007]

As described above, in the present invention, since the intake port and the exhaust port of the engine are provided at the lower end of the engine, the exhaust system member connected to the exhaust port is The floor panel can be disposed with a sufficient space provided between the floor panel and the floor panel, whereby the effect of heat damage from the engine exhaust system to the floor panel can be minimized. Further, in the present invention, the intake port and the exhaust port are provided at a predetermined distance in the vehicle front-rear direction, and the first cross member extending in the vehicle width direction is provided between the both ports below the engine. Therefore, it is possible to arrange the cross member in a space-saving manner without interfering with the engine and other power train constituent elements, and by interposing the cross member, heat from the engine exhaust system to the engine intake system can be reduced. The effects of harm can be minimized.

In addition to the above configuration, as described in claim 2, a differential is provided on the vehicle rear side of the engine,
If a second cross member that extends in the vehicle width direction and is integrally formed with the first cross member at both ends is provided and the differential is mounted on and supported by the second cross member, the first cross member is mounted. Since the closed frame structure can be formed by the second cross member, it is possible to improve the support rigidity of the powertrain components and the rigidity of the vehicle body itself.

Regarding the arrangement structure of the transmission in this case, for example, as described in claim 3, the transmission is a transmission having a drive shaft extending in the vehicle width direction, and the transmission is provided above the differential. do it.

Here, the above "transmission" is
It may be a manual transmission or an automatic transmission.

Further, with respect to the clutch (a concept including not only a mechanical clutch but also a fluid clutch, a torque converter, etc.) generally provided between the engine and the transmission, the disposition position is not particularly limited, and it is not limited to the vehicle. The arrangement position may be set according to individual conditions.

The positional relationship of the intake and exhaust ports in the vehicle longitudinal direction is not particularly limited,
From the viewpoint of ease of layout of the intake system member and the exhaust system member, it is preferable that the intake port is provided on the vehicle front side with respect to the exhaust port as described in claim 4.

In addition to the above construction, as described in claim 5, a third cross member extending in the vehicle width direction is provided above the first cross member on the front side of the vehicle, and the third cross member is provided. By mounting and supporting the surge tank of the engine on the upper part, and extending the intake system member of the engine from the surge tank to the rear side of the vehicle through the front and the lower part of the third cross member and connecting to the intake port, It is possible to lengthen the intake pipe reasonably by ensuring the support rigidity of the surge tank and effectively utilizing the space around the third cross member.

[0014]

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

FIG. 1 is a skeleton showing an embodiment of an automobile powertrain arrangement structure according to the present invention, FIG. 2 is a side sectional view thereof, and FIG. 3 is a plan view thereof (floor panel is shown). FIG.

As shown in these figures, the engine 12
Is a transverse engine in which the drive shaft 12a is arranged so as to extend in the vehicle width direction, and a clutch (mechanical clutch) 14 is arranged in series on the lateral side of the engine 12 in the vehicle width direction. That is, the clutch shaft 14 of the clutch 14 is attached to one output end 12aa of the drive shaft 12a of the engine 12.
a is connected to the engine drive shaft 12a so as to be aligned with the engine drive shaft 12a.

A transmission (manual transmission) 1 is provided on the vehicle rear side of the engine 12.
6 are arranged in parallel. That is, the engine drive shaft 1
2a and the clutch shaft 14a, the input shaft 16a of the transmission 16 is arranged in parallel, and the sprocket 20 and the input shaft 16a provided on the clutch shaft 14a are arranged.
Is connected to a sprocket 22 provided on the vehicle through a silent chain 24.

Further, a differential 18 is provided below the transmission 16, and a gear 26 provided on an output shaft 16b of the transmission 16 is provided.
And the gear 28 of the differential 18 mesh with each other.

The driving force of the engine 12 is transmitted to the left and right drive shafts 32L and 32R via the differential 18. The drive shafts 32L and 32R are further connected to the left and right rear wheels 36L and 3L via the left and right connecting shafts 34L and 34R.
It is connected to 6R axles 38L, 38R.

An alternator 40, a power steering pump 42, and an air conditioner pump 44 as auxiliary machines are provided near the lateral end of the engine 12 opposite to the clutch 14 in the vehicle width direction. The pulleys 40a, 42a and 44a of each of these auxiliary machines are connected to the engine drive shaft 12a.
The auxiliary drive pulley 46 and the idler pulley 90 provided at the auxiliary drive output end 12ab on the side opposite to the clutch 14 side output end 12aa are connected via a belt 48.

Next, a specific structure of the power train structure will be described.

As shown in FIG. 2, the floor panel 52 constituting the floor surface portion of the passenger compartment is a bulkhead portion 52a behind the seat.
It is formed so that it rises backward at the boundary. The power train system member including the engine 12, the clutch 14, the transmission 16, and the differential 18 is disposed below the floor panel 52 and behind the bulkhead portion 52a. In the rear portion of the bulkhead portion 52a of the floor panel 52, an upper portion 52b of the space occupied by the powertrain system member is formed higher than the rear portion 52c to avoid the powertrain system member. . The portion 52b formed to be one step higher is referred to as a power train avoidance elevated floor portion. The rear part 52c
The latter half of the is formed to be slightly higher.

A pair of side frames 54L and 54R extend in the vehicle front-rear direction on both sides of the floor panel 52 in the vehicle width direction. Further, a side frame is provided below the powertrain avoiding high floor portion 52b. Frames 54L, 54
Three front and rear cross members 56, 58, 60 extending in the vehicle width direction are provided so as to connect R. The cross member 56 is in the vicinity of the front end of the engine 12
Is provided near the lower part of the engine 12, and the cross member 60 is provided near the lower part of the differential 18. The cross member 58 and the cross member 60 include a pair of connecting members 62 extending in the vehicle front-rear direction at both ends in the vehicle width direction.
It is integrally formed via L and 62R, thereby forming a closed rectangular frame structure. The power train system member includes a pair of side frames 54L,
54R are provided between the cross members 56 and 60, and the mount rubber 64 is provided at two places on the left and right (a total of four places).
It is mounted on the vehicle body via 66.

The engine 12 is a dry sump type rotary engine, and is arranged in a state of being rotated by 90 ° with respect to a normal mounting angle so that the intake port 68 and the exhaust port 70 are located at the lower end portion. The intake port 68 and the exhaust port 70 are provided at predetermined intervals in the vehicle front-rear direction (the intake port 68 is in front). The cross member 58 is provided between the ports 68 and 70 below the engine 12.

A surge tank 72 is provided above the cross member 56, and the intake manifold 74 is
The surge tank 72 extends forward and downward of the cross member 56 and extends in a C-shape toward the vehicle rear side and is connected to the intake port 68. An intake pipe 76 and an air cleaner 78 are further connected to the surge tank 72. The air cleaner 78 is provided near the lateral side of the transmission 16 in the vehicle width direction, and the intake pipe 76 includes the bulkhead portion 52a and the powertrain avoiding raised floor portion 5.
2b, the engine 12 extends from the front side of the vehicle to the rear side of the vehicle through the upper side thereof and is connected to the air cleaner 78.

On the other hand, the exhaust port 70 has an exhaust system member (exhaust manifold 80, precatalyst 82, exhaust pipe 84, main catalyst 86) extending toward the rear side of the vehicle.
And a silencer 88) are connected.

As shown in FIG. 3, a lower suspension arm 90 is connected to the cross member 60 forming a part of the rectangular frame structure, which also forms a part of the rectangular frame structure. Each connecting member 62L, 6
An upper suspension arm 92 is connected to 2R, and a trailing arm 9 is attached to the cross member 56.
4 are connected.

Next, the operation of this embodiment will be described.

As described in detail above, in this embodiment, the intake port 68 and the exhaust port 7 of the engine 12 are
Since 0 is provided at the lower end portion of the engine 12, an exhaust system member (especially, the exhaust manifold 80 that becomes high in temperature) connected to the exhaust port 70 should be disposed with a sufficient space between it and the floor panel 52. As a result, the influence of heat damage from the engine exhaust system to the floor panel 52 can be minimized. The intake port 68 and the exhaust port 70 are provided at a predetermined distance in the front and rear, and the cross member 58 extending in the vehicle width direction is provided between the ports 68 and 70 below the engine 12, The cross member 58 can be arranged while saving space without interfering with the engine 12 and other power train components, and the presence of the cross member 58 allows the engine exhaust system to be connected to the engine intake system. The influence of heat damage can be minimized.

The intake port 68 is the exhaust port 7
Since it is provided on the vehicle front side with respect to 0, the layout of the intake system member and the exhaust system member connected to both ports 68 and 70 can be facilitated.

Further, in this embodiment, the engine 12
On the rear side of the vehicle, a differential 18 and a cross member 60 that extends in the vehicle width direction and is integrally formed at both ends with the cross member 58 via a pair of left and right connecting members 62L and 62R are provided. Since the differential member 18 is mounted and supported on the cross member 60, a closed frame structure can be formed by the cross members 60 and 58 and the connecting members 62L and 62R, and as a result, a power train constituent element. It is possible to improve the support rigidity of the vehicle body and the rigidity of the vehicle body itself.

Further, in this embodiment, a cross member 56 extending in the vehicle width direction is provided above the cross member 58 on the front side of the vehicle, and the surge tank 64 of the engine 12 is mounted and supported on the cross member 56. Since the intake manifold 74 of the engine 12 extends from the surge tank 64 to the rear side of the vehicle through the front and lower portions of the cross member 56 and is connected to the intake port 68, the support rigidity of the surge tank 64 is secured. In addition, the intake pipe length can be naturally lengthened by effectively utilizing the space around the cross member 56.

[Brief description of drawings]

FIG. 1 is a skeleton showing an embodiment of a vehicle powertrain arrangement structure according to the present invention.

FIG. 2 is a side sectional view of the above embodiment.

FIG. 3 is a plan view of the above-described embodiment (a view with the floor panel removed)

[Explanation of symbols]

 12 engine 12a engine drive shaft 14 clutch 16 transmission 18 differential 40 alternator 42 power steering pump 44 air conditioner pump 52 floor panel 56 cross member (third cross member) 58 cross member (second cross member) 60 cross member (first) Cross member) 68 Intake port 70 Exhaust port 72 Surge tank 74 Intake manifold 76 Intake pipe 78 Air cleaner 80 Exhaust manifold 82 Pre-catalyst 84 Exhaust pipe 86 Main catalyst 88 Silencer

Front Page Continuation (72) Inventor Tomohiro Hori 3-1, Shinchi Fuchu-cho, Aki-gun, Hiroshima Mazda Motor Corporation

Claims (5)

[Claims] 1. A powertrain disposition structure in an automobile, in which an engine having a drive shaft extending in a vehicle width direction is disposed below a floor panel constituting a floor portion of a vehicle compartment, wherein a lower end portion of the engine is provided. The intake port and the exhaust port are provided at a predetermined distance in the vehicle front-rear direction, and a first cross member extending in the vehicle width direction is provided between the both ports below the engine. The powertrain layout structure for automobiles. 2. A differential and a second cross member that extends in the vehicle width direction and is integrally formed with the first cross member at both ends are provided on the vehicle rear side of the engine. 2. The vehicle powertrain arrangement structure according to claim 1, wherein the differential is mounted and supported by the second cross member. 3. The vehicle powertrain arrangement structure according to claim 2, wherein a transmission having a drive shaft extending in a vehicle width direction is provided above the differential. 4. The powertrain arrangement structure for an automobile according to claim 1, wherein the intake port is provided on a vehicle front side with respect to the exhaust port. 5. A third cross member extending in the vehicle width direction is provided above the vehicle front side of the first cross member, and a surge tank of the engine is provided above the third cross member. The engine is mounted and supported, and an intake system member of the engine extends from the surge tank to the vehicle rear side through the front and the lower side of the third cross member and is connected to the intake port. The powertrain arrangement structure for an automobile according to claim 4.