JP2529871B2 - Automotive engine unit - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine unit of an automobile, and more particularly to a layout of an engine, a transmission and a differential mechanism suitable for a front wheel drive type automobile.

[Conventional technology]

Conventionally, a front wheel drive type engine arranged in the engine compartment on the front side of the vehicle compartment generally has a crankshaft and a transmission shaft driven by the crankshaft arranged in parallel with the axle, and has a plurality of cylinders cooperating with the crankshaft. In many cases, the transmission shaft and the differential gear shaft are arranged in order from the crankshaft to the rear after being vertically or tilted forward.

On the other hand, in recent years, it has been required to lower the engine hood to widen the interior of the vehicle and to widen the visibility of the front of the vehicle, and to reduce the volume of the engine interior. Various configurations for reducing the size of the arrangement of the transmission, the transmission, and the clutch have been tried.

[Problems to be solved by the invention]

However, in order to prevent damage to fuel system parts and pipes in the case of a vehicle collision, most of these engines have a cylinder at the front end of the engine unit and fuel system parts and fuel pipes behind them. Because
Since the tall cylinder is arranged on the front side of the engine hood, it is difficult to reduce the height of the engine hood. Further, in order to avoid such a problem, the engine is tilted forward, but this causes a problem that the length in the front-rear direction in the engine chamber is increased conversely.

[Means for solving problems]

The present invention solves the above-mentioned problems and prevents the fuel system parts and piping of the engine from appearing in the front row of the engine unit, and the engine unit for the front-wheel drive has a compact outer shape. It is held between the crankcases that are vertically divided into the engine compartment in the front of the vehicle compartment, and is located in front of the left and right front axles and is parallel to this. And the front side of the crankcase, the mating surface of the crankcase is tilted upward, and the cylinders that cooperate with the crankshaft are tilted rearward and upward. The air-fuel mixture generating means installed in the intake pipe is arranged in a space of a substantially inverted triangle formed by the crankcase, the cylinder row, and the engine hood in a side view. It is characterized in that the location.

[Action]

Since the transmission is located on the front side of the cylinder row and the cylinder row is tilted rearward, it will be placed in the higher part of the rear part of the engine hood, and on top of the transmission there will be relatively large fuel system parts and piping. The space for the vehicle can be secured, and the deformation of the vehicle body applied from the front side when the vehicle collides is absorbed by the crankcase arranged at the foremost end of the engine compartment.

〔Example〕

Hereinafter, the present invention will be described with reference to the illustrated embodiments.
In FIG. 2, reference numeral 1 denotes an engine compartment arranged in front of the body of a passenger vehicle, in which a transverse engine unit E for driving the front wheels 2 is mounted with a crankshaft 3 oriented in the width direction of the body. . F is an engine hood that covers the upper surface of the engine unit E and regulates the upper limit of the engine compartment.

The engine unit E is an engine (e) and a transmission (t).
And a known differential gear mechanism (d) provided on the axle 4 are integrally coupled, the differential gear mechanism (d) is disposed behind the engine (e), and the transmission (t) is It is arranged beside the engine (e) and connects the engine (e) and the differential gear mechanism (d). (C) is a multi-plate friction clutch interposed between the engine (e) and the transmission (t).

As shown in FIG. 1, the engine (e) has a combustion chamber 5 composed of a cylinder block 5a, a cylinder head 5b, and a piston 5c. Intake passage 6 in combustion chamber 5
And an exhaust passage 7 are connected to each other, and the intake passage 6 is constituted by an intake pipe 6a extending to the front of the engine compartment 1. 6b is a fuel injection nozzle which is a means for generating a mixture by supplying gasoline as a fuel to the intake air to generate a mixture, and can be replaced by a carburetor (not shown). Reference numeral 6c is a connection passage that connects the intake passages 6 of the respective cylinders to each other. Incidentally, 3a is a known crankshaft flywheel.

The cylinder block 5a constitutes a cylinder row R formed by arranging the cylinder holes 5d. The cylinder row R is inclined rearward, and the cylinder head 5b is shown in FIGS.
As shown in the drawing, the front wheel 2 is installed behind the axle 4 in a plan view. Further, parts and pipes forming a fuel system, such as the fuel injection nozzle 6b and the fuel pipe 6d leading to the fuel injection nozzle 6b, are also arranged rearward of the axle 4. The lower surface of the cylinder block 5a is covered with a lower case 5e, which constitutes a crankcase C. That is, as shown in FIG. 2, a crankshaft 3 and an output shaft 8 located in front of the crankshaft 3 are rotatably held by bearings 5f between them. The crankshaft 3 and the output shaft 8 are decelerated to about 80% and interlock with each other via an intermediate gear 9 and an output gear 10 which mesh with each other. In addition,
The intermediate gear 9 is rotatably supported on the output shaft 8 by rotation, and the output gear 10 is formed on the outer circumference of the crank web. In addition, the intermediate gear 9 has a timing gear 9a integrally formed on the boss, an output shaft 8 via a coil spring 9b serving as a buffer member, and a multi-plate friction clutch 8a connected to the output shaft 8. Connected to the transmission (t) to drive them. Reference numeral 9c is a sprocket chain-connected to the starter motor, and 11 is a silent chain connecting the transmission (t) and the differential gear mechanism (d).

The mating surface 5f between the cylinder block 5a and the lower case 5e is formed so as to be higher in the front in the traveling direction of the vehicle and to rise upward, and as a result, a V-shaped space is formed above the crankshaft 3. 12
Is an AC generator connected to the output shaft 8, and 13 is an air cleaner provided at the front end of the intake pipe 6a.

Reference numeral 14 is a valve operating cam shaft for driving the intake valve 15 and the exhaust valve 16. As shown in FIGS. 2 and 3, the valve camshaft 14 is
Intermediate gear 9 through first chain 17 and second chain 18
It is connected to a timing gear 9a formed on the boss portion of and is driven by the crankshaft 3 at a speed ratio of 1/2.

Therefore, on the lower surface of the engine hood F, the cylinder row R and the crankcase portion C forming the lower part of the cylinder block 5a.
As a result, a space having a substantially inverted triangle in side view is formed, and the intake pipe 6a extending from the cylinder head 5b to the front of the vehicle is housed therein. That is, a carburetor and a fuel injection nozzle, which are the air-fuel mixture generating means 6b attached to the intake pipe 6a, are arranged. Also,
The cylinder head 5b, which constitutes a relatively high portion of the engine, is arranged at a high portion of the inclined engine hood F near the passenger compartment, and it is easy to avoid interference with them. That is, the height of the engine hood F can be reduced. Along with this, the intake pipe 6a extends forward from the cylinder head 5b, but they are stopped toward the vehicle compartment side from the crankcase portion accommodating the output shaft 8 and the front of the vehicle body is collided by a vehicle collision. Even if a part is destroyed, its influence is prevented from affecting the fuel system.

When the engine is started, the rotation of the crankshaft 3 is decelerated to a speed of about 80% between the output gear 10 provided on the outer circumference of the crank web and the intermediate gear 9 meshing with the output gear 10 and transmitted. A timing gear 9a is engraved on the boss portion of the intermediate gear 9 and is further decelerated to about 62% to interlock with the rotation of the crankshaft 3 to drive the camshaft 14 at a speed ratio of 1/2. . Further, the rotation of the intermediate gear 9 is transmitted to the output shaft 8 via the coil spring 9b serving as a buffer member, and then to the clutch 8a. The coil spring 9b causes the front wheel 2 serving as the driving wheel to vibrate in the rotational direction from the ground. When subjected to a sudden load change, a slight phase difference is generated between them and they are transmitted as a buffer.

[Effects of the Invention] As described above, the engine unit E according to the present invention is
Due to the engine hood F and the cylinder block 5a arranged below the engine hood F, a side view is provided by a cylinder row R inclined rearward on the lower surface of the engine hood F and a crankcase C inclined rearward and upward. Since a substantially inverted triangular space is formed and an intake pipe 6a having a mixture generating means extending from the cylinder head 5b to the front of the vehicle is arranged therein, the cylinder forming the relatively high portion of the engine is installed in the vehicle. The height of the engine hood can be lowered relatively easily because it is arranged in a high portion of the engine hood close to the room. In addition, the intake system is guided forward from the cylinder head 5b along with it, but they are stopped toward the vehicle compartment side from the crankcase portion accommodating the output shaft 8 and the engine fuel system piping is connected to the engine unit E. There is an effect that the outer shape of the engine can be made compact without coming out at the front row in the traveling direction.

[Brief description of drawings]

The drawings show an embodiment of the present invention, and FIG.
The side view which fractured | ruptured the one part which expands and shows the principal part in a figure, 2nd
The drawing is a sectional view taken along the line II-II, FIG. 3 is the sectional view taken along the line II-II, FIG. 4 is a plan view showing the engine compartment of an automobile, and FIG. 5 is a side view thereof. 4 ... axle, (t) ... transmission, (d) ... differential gear mechanism, (c) ... friction clutch, 8 ... output shaft, 9 ... intermediate gear, 9a ... timing gear, 10 ... Output gear.

Claims (3)

(57) [Claims] 1. A front and rear crankshafts sandwiched between crankcases which are vertically divided into an engine compartment at the front of the vehicle compartment, and are arranged in front of the left and right front axles and in parallel with the crankshafts, transmission shafts, and sequentially frontward. Then, the mating surface of the crankcase is inclined forwardly upward, and each cylinder that cooperates with the crankshaft is inclined toward the rear upper side, and an intake pipe extending from there to the vehicle front is installed. An engine unit for an automobile, in which the air-fuel mixture generating means installed in the intake pipe is arranged in a space formed by the crankcase, the cylinder row, and the engine hood and having a substantially inverted triangular side view. 2. The vehicle engine unit according to claim 1, wherein the means for producing the air-fuel mixture is either a carburetor or a fuel injection nozzle. 3. An output shaft of a transmission, which is disposed in front of and behind a crank shaft, and a differential shaft, which is connected to a front axle, are connected via a winding transmission means. The engine unit for automobiles according to item 1.