JPH04276172A - Engine structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of an engine mounted horizontally on a vehicle body.

0002

[Prior Art] In order to meet the demands for lowering the bonnet line of the car body as much as possible, and for reducing the length of the engine compartment in the longitudinal direction and shortening the front nose, automobile engines are designed to It is necessary to make the structure as compact as possible, and various efforts have been made to achieve this. For example, in the system described in West German Patent No. 3838073, the engine and transmission are mounted in parallel to the vehicle body horizontally on a rear slant, and the surge tank is placed on the front side of the vehicle body in the cylinder head. The downstream intake pipe is curved downward from the surge tank and connected to the cylinder head, and the exhaust pipe is connected to the cylinder head from behind, and auxiliary equipment is arranged below the intake pipe.

0003

[Problem to be solved by the invention] When the engine is mounted horizontally on the vehicle body, the above-mentioned West German Patent No. 383807
If the exhaust is taken out from the rear of the engine as in the one described in Specification No. 3 (hereinafter referred to as the conventional example),
This creates extra space in front of the engine, allowing auxiliary equipment to be placed in this area. Further, by slanting the engine to the rear, it is possible to arrange the auxiliary equipment at a position on the front of the vehicle body close to the skirt portion of the engine block, as in the above-mentioned conventional example, without increasing the engine size in the longitudinal direction of the vehicle body. However, when auxiliary equipment is placed in front of the engine in this way, the surge tank has to be placed above as in the conventional example above, so it cannot meet the demand for lowering the bonnet line of the car body. I can't.

The invention of this application was made in view of the above-mentioned problems, and it is an object of the present invention to provide an engine structure that allows the bonnet line to be lowered as much as possible.

Another object of the invention of this application is to suppress an increase in engine dimensions in the longitudinal direction of the vehicle body while lowering the bonnet line.

[0006]

[Means for Solving the Problems] The invention of this application is an engine that is mounted horizontally on a vehicle body, and an intake system surge tank is disposed at a position on the front side of the vehicle body close to the skirt portion of the engine block. However, the intake pipe downstream of the surge tank is curved upward and connected to the cylinder head, and the exhaust pipe is connected to the cylinder head from the rear.

[0007] In the above configuration, when the engine is arranged on a rear slant, the auxiliary equipment can be attached to the oil pan section below the engine.

[0008] In addition, in the above-described configuration with a rear slant, the highest part of the intake system is formed in the middle of the intake pipe that curves upward from the surge tank. The fuel injection valve should be installed at a position closer to the engine than the engine.

Furthermore, in the above configuration, the transmission is disposed on the rear side of the vehicle body with respect to the engine, opposite to the surge tank.

0010

[Operation] The engine is mounted horizontally on the car body, the surge tank is placed on the front side of the car body close to the skirt of the engine block, and the intake pipe downstream of the surge tank is curved upward and connected to the cylinder head. In addition, because the exhaust pipe is connected to the cylinder head from the rear, the height of the engine, especially on the front side of the vehicle body, is suppressed, making it possible to have a low bonnet line.

Furthermore, since the exhaust pipe is connected to the cylinder head from the rear, there is no need to create a space below the engine for routing the exhaust pipe. There is more than enough space for the oil pan below. Therefore, the degree of freedom in the shape and layout of the oil pan increases, making it easier to place auxiliary equipment in the oil pan area.
By placing auxiliary equipment in the oil pan area, it is possible to suppress the increase in engine dimensions in the longitudinal direction of the vehicle body.

Furthermore, by providing the fuel injection valve at a position closer to the engine than the highest part of the intake system, the injected fuel is prevented from flowing down toward the surge tank.

Furthermore, the transmission can be disposed on the rear side of the vehicle body opposite to the surge tank with respect to the engine, thereby providing a compact powertrain structure as a whole.

[0014]

Embodiments Hereinafter, embodiments of the invention of this application will be described based on the drawings.

FIG. 1 is a layout diagram of an engine according to an embodiment of the invention of this application as seen from the front end side (left side of the vehicle body), and FIG.
is a partial sectional view of the same engine seen from the front side (front of the vehicle body).

[0016] The engine 1 of this embodiment is an in-line four-cylinder engine, and is mounted in the front part of the vehicle body with the crankshaft 2 oriented horizontally in the vehicle width direction, with a rear slant. A transmission 3 is arranged in parallel on the side of the engine 1 and located at the rear when viewed from the front of the vehicle, and an oil pan 4 of an integrated structure is arranged below the engine 1 and the transmission 3. . Further, a surge tank 6 is provided on the front side of the engine 1 at a position close to the lower block 5 that constitutes the main body skirt portion, and an intake pipe 7 that communicates the surge tank 6 with the combustion chamber of each cylinder is arranged upwardly. It extends in a curved manner and is connected to the cylinder head 8.

[0017] The oil pan 4 is located between the engine 1 and the transmission 3 due to the rear slant of the engine 1.
The lower block 5 is formed to fill a generally triangular space in a side view that is formed below the engine 1, and in the longitudinal direction of the engine 1, from a position close to the clutch housing 9, the lower block
It is provided in a range from the front end position to a position retracted a predetermined distance.

An auxiliary drive shaft 10 is provided in the oil pan 4 so as to pass through a portion thereof on the engine 1 side in a direction parallel to the crankshaft 2. On the rear end side of the engine 1, below the clutch housing 9, an oil pump (hereinafter referred to as A
It's called a T oil pump. ) 11 is disposed, and a power steering pump 12 is disposed outside thereof, and these AT oil pump 11 and power steering pump 12 are connected in series to the end of the accessory drive shaft 10. Further, on the front end side of the oil pan 4, a water pump 13 is disposed in a recess formed on the side of the oil pan 4 below the lower block 5, and is connected to an end of the auxiliary drive shaft 10. Furthermore, an oil pump (hereinafter simply referred to as oil pump) 14 for engine lubrication is arranged inside the side wall of the oil pan on the side to which the water pump 13 is connected, and this is connected to the auxiliary drive shaft 10. .

A partition wall 15 is formed in the shape of a box in the oil pan 4 at a position close to the side wall away from the oil pump 14 . The auxiliary drive shaft 10 passes through this partition wall 15, and a driven side sprocket 16 is provided at a position surrounded by the box-shaped partition wall 15. Further, in the oil pan 4, an extending portion 15a of the partition wall 15 is located at a position near the rear end of the engine on the mission 3 side of the partition wall 15.
is provided, and the shaft portion 1 of the idle gear 17 is provided on its upper end surface.
A support member 19 that rotatably supports 8 is fixed. The idle gear 17 is arranged at a position facing the No. 8 web 20 on the rear end side of the crankshaft, and a driving side sprocket 21 is fixed to the tip of the shaft portion 18 at a position facing the driven side sprocket 16. ing.

The two sprockets 16 and 21 on the driven side and the driving side are connected by a chain 22. In addition, the above No. 8 web 2 is attached to the crankshaft 2 of the engine 1.
A power take-off gear 23 is provided at the 0 portion, and the gear 23 and the idle gear 17 are engaged with each other.

With this configuration, the power taken out from the power take-off gear 23 is transferred to the idle gear 1.
7, and further transmitted to the accessory drive shaft 10 via the drive sprocket 21, chain 22, and driven sprocket 16. Then, the AT oil pump 11, power steering pump 12, water pump 13, and oil pump 14 connected to the auxiliary drive shaft 10 are driven.

An oil filter 24 is attached to the front end side wall of the oil pan 4 from the outside.

The exhaust pipe 25 of the engine 1 is connected to the cylinder head 8 from the rear. Further, a fuel injection valve 27 is attached to the cylinder head 8 so as to inject fuel into the in-head intake passage 26 from above. The intake pipe 7 from the surge tank 6 to the cylinder head 8 is curved upward as described above, and as shown in FIG. 1, the middle of the intake pipe 7 is the highest part of the intake system. Therefore, the cylinder head 8, which is located closer to the engine 1 than this,
The fuel injected from the fuel injection valve 27 provided in the portion does not flow down to the surge tank 6 side.

The surge tank 6 is connected to the engine 1 as described above.
The bonnet line 28 of the vehicle body is not restricted by the intake system, as shown in FIG. It can be set at a low position based on the head cover 29 of the engine 1 and the front radiator 30.

In the above embodiment, the fuel injection valve is attached to the cylinder head, but the fuel injection valve may be attached to the intake pipe within the range closer to the engine than the highest part of the intake system. .

[0026]

[Effects of the Invention] Since the invention of this application is constructed as described above, the bonnet line can be lowered as much as possible.

Furthermore, by attaching the auxiliary equipment to the oil pan below the engine in the rear slant, it is possible to lower the bonnet line and reduce the engine dimensions in the longitudinal direction of the vehicle body.

[Brief explanation of the drawing]

[Fig. 1] A layout diagram of an engine according to an embodiment of the invention of this application, viewed from the front end side (left side of the vehicle body)

[Figure 2] Partial cross-sectional view of the engine seen from the front side (front of the vehicle body)

[Explanation of symbols]

1 Engine 4 Oil pan 5 Lower block (engine block) 6 Surge tank 7 Intake pipe 11 AT oil pump 12 Power steering pump 13 Water pump 14 Oil pump 24 Oil filter 25 Exhaust pipe 27 Fuel injection valve 28 Bonnet line

Claims (4)

[Claims] Claim 1: An engine mounted horizontally on a vehicle body, in which a surge tank of the intake system is arranged at a position on the front side of the vehicle body close to the skirt portion of the engine block, and an intake pipe downstream of the surge tank is arranged. An engine structure characterized in that the exhaust pipe is curved upward and connected to the cylinder head, and the exhaust pipe is connected to the cylinder head from the rear. 2. The engine structure according to claim 1, wherein the engine is arranged with a rear slant, and the auxiliary equipment is attached to an oil pan portion below the engine. 3. The engine structure according to claim 2, wherein the fuel injection valve is provided at a position closer to the engine than the highest part of the intake system. 4. The engine structure according to claim 1, wherein the transmission is disposed on the rear side of the vehicle body opposite to the surge tank with respect to the engine.