JP2829594B2 - Engine unit for vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle engine unit.

[0002]

2. Description of the Related Art A vehicle such as an automobile has an engine body composed of a cylinder block and a cylinder head.
In some cases, a crankshaft is arranged to extend in the vehicle width direction, and a plurality of cylinders are arranged in parallel in the crankshaft direction. Nowadays,
With the focus on vehicle safety, comfort and comfort, the frame of the vehicle was determined in the first stages of design, and then the parts of the vehicle were designed to fit the frame. Also, to reduce costs, the same engine has come to be mounted on many types of automobiles.

[0003]

As described above, in order to mount the same engine on various kinds of vehicles having different frame sizes, it is necessary to make the engine unit as compact as possible. In addition, the space for mounting the vehicle engine is often such that the width of the lower cylinder block is narrow and the width of the upper cylinder head is somewhat longer. The present invention has been made in view of such circumstances, and in a vehicle engine unit, the length of the lower cylinder block in the vehicle width direction is shortened, and the length of the cylinder head in the vehicle width direction is slightly increased. The task is to make the whole compact.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention has an engine body including a cylinder block and a cylinder head, and arranges a crankshaft so as to extend in a vehicle width direction. Angle α between a straight line L2 connecting the axis of the crankshaft and the axis of the first intermediate shaft and the cylinder axis L1 in a side view.
And the first intermediate shaft, the second intermediate shaft, the intake valve driving camshaft, and the exhaust valve driving camshaft to which the rotational force of the crankshaft is transmitted are parallel to the crankshaft and a straight line L2 in side view.
Along the engine body from the upper position to a position beyond the position on the cylinder axis L1, the crankshaft and the first intermediate shaft are positioned within the width of the cylinder row, and power is transmitted from the crankshaft to the first intermediate shaft. A transmission that transmits power is positioned within the width of the cylinder row, a first chain that transmits power from the first intermediate shaft to the second intermediate shaft is positioned within the width of the cylinder row, and is disposed substantially parallel to the cylinder axis; The second intermediate shaft, the intake valve driving cam shaft, and the exhaust valve driving cam shaft extend outside the width of the cylinder row, and power is supplied from the second intermediate shaft to the intake valve driving cam shaft and the exhaust valve driving cam shaft. The transmission second chain is located outside the width of the cylinder row.

[0005]

Embodiments of the present invention will be described with reference to the accompanying drawings. 1 and 2, reference numeral 1 denotes an engine room of an automobile. The engine room 1 is formed above right and left front wheels 3 connected by a front axle 2 and between them. In the engine room 1, an engine unit 4 of a four-stroke, six-cylinder engine is mounted, and a radiator 5 is arranged in front of the engine unit 4 in the vehicle. The engine unit 4 is arranged so that the crankshaft 6 extends in the vehicle width direction.

As shown in FIGS. 5 to 7, a crankshaft 6 of an engine unit is supported between a cylinder block 7 and a bearing case 8 and connected to a piston 9 provided in each cylinder by a connecting rod 10. I have. A cylinder head 11 is mounted on the cylinder block 7 to form an engine body E. The cylinder head 11 is provided with a head cover 12 and further provided with a spark plug 13 for each cylinder. An oil pan 14 is attached to the bearing case 8, and an oil tank 15 is further connected to the oil pan 14.

As shown in FIGS. 4 and 5, the cylinder row (cylinder row) of the engine is inclined rearward of the vehicle with respect to the vertical direction, and a first intermediate shaft (output take-out) for taking out the output of the crankshaft 6. The shaft 16, the second intermediate shaft 31 to which the rotational force of the crankshaft 6 is further transmitted, the intake valve driving camshaft 37, and the exhaust valve driving camshaft 37 ′ are arranged in parallel with the crankshaft 6. An oil tank 15 for storing oil is located below and obliquely below the first intermediate shaft 16 and the crankshaft 6, so that the oil tank 15 faces the front of the vehicle as indicated by an arrow FWD in FIGS. It has become. The angle α between the cylinder axis L1 and a straight line L2 connecting the crank axis and the first intermediate shaft 16 is an acute angle. Then, the first intermediate shaft 16, the second intermediate shaft 31, the intake valve driving camshaft 37 and the exhaust valve driving camshaft 37 'are moved from a position obliquely above the crankshaft 6 (a position on the straight line L2) in a side view. It is arranged along the engine main body at the rear upper portion (a location extending rightward beyond the position on the cylinder axis L1). Therefore, the distance between the cylinder axis L1 and the first intermediate shaft 16 is reduced, and the distance between the first intermediate shaft 16 and the second intermediate shaft 31 is also reduced.

As shown in FIG. 5, the oil pan 14 has a pair of oil passages 17 passing vertically on both sides of a guide portion 14a.
The oil stored in the oil pan 14 is sucked from the suction port 17 a below the oil passage 17 by the discharge pumps 18 and 19 provided on the first intermediate shaft 16 and sent to the oil tank 15. . A net 20 is provided in the suction port 17a so as not to suck dust. Inside the oil pan 14, a plate 21 is attached to the guide portion 14a.

The oil stored in the oil tank 15 is the first oil.
Driven by a refueling pump 24 provided on the intermediate shaft 16, a strainer 25 and a pipe arranged at the bottom of the oil tank 15
Inhaled through 26. Thereafter, the oil passes through an oil cooler 22 and an oil filter 23, an oil passage 14b formed in the oil pan 14, an oil passage 8a formed in the bearing case 8, the cylinder block 7 and the cylinder head 11
The oil is supplied to each part of the engine via oil passages 7a and 11a formed in the engine. This oil flows through the oil passage 11b of the cylinder head 11 and the oil passage 7b of the cylinder block 7 and is returned to the oil pan 14, and the circulation of this oil is indicated by an arrow in FIG. An oil inlet 15a is provided at the top of the oil tank 15, and is closed by a cap 27.

As shown in FIGS. 6 and 7, the crankshaft 6
The first intermediate shaft 16 is located within the width of the cylinder row (within the axial width of the crankshaft 6). A gear 28 is formed by the crank arm, and the gear 28 is a gear 29 provided on the first intermediate shaft 16.
And a transmission for transmitting power from the crankshaft 6 to the first intermediate shaft 16 is located within the width of the cylinder row. Power is transmitted from the crankshaft 6 to the first intermediate shaft 16 by a gear.
It is not limited to 28 and 29, but may be a chain. First
The first chain 33 for transmitting power from the intermediate shaft 16 to the second intermediate shaft 31 is positioned within the width of the cylinder row, and the first chain 33 is disposed substantially parallel to the cylinder axis L1 (see FIG. 4). The second intermediate shaft 31, the intake valve driving camshaft 37, and the exhaust valve driving camshaft 37 'extend outside the width of the cylinder row, and the second intermediate shaft 31 drives the intake valve driving camshaft 37 and the exhaust valve driving. Cam shaft
The second chain 35 for transmitting power to 37 'is positioned outside the width of the cylinder row.

As shown in FIG. 4, the second intermediate shaft 31 is located on the front side of the engine body E so that the cylinder head 11
The gear 30 provided on the first intermediate shaft 16 is connected to the gear 32 of the second intermediate shaft 31 via a first chain 33. Further, a gear 34 provided on the second intermediate shaft 31
Is the gear 38 of the cam valve 37 for driving the intake valve of the valve mechanism 36 and the gear 3 of the cam shaft 37 'for driving the exhaust valve via the second chain 35.
The camshaft 37 for driving the intake valve and the camshaft 37 'for driving the exhaust valve are rotated by rotation of the crankshaft 6. The cylinder head 11 supporting the second intermediate shaft 31 has the mounting openings 11 for the two gears 32 and 34 of the second intermediate shaft 31.
2 and 113 are formed, and the mounting opening 112 is a cap.
The mounting opening 113 is covered with a cover 116.

In order to be located on the front side of the engine body E,
A rotary shaft 121 for driving the water pump 120 is provided with a crankshaft 6 and a first intermediate shaft 16 on the front side of the cylinder block 7.
And a gear 12 provided on the rotating shaft 121.
2 meshes with the first chain 33, and the rotation of the crankshaft 6 causes the rotation shaft 121 to rotate in conjunction therewith. The rotating shaft 121 is shown in FIG.
As shown in the figure, the cylinder shaft L1 is provided on the same side as the first intermediate shaft 16 for taking out the power of the crankshaft 6,
Moreover, since the first intermediate shaft 16 is an indispensable component for extracting the power of the crankshaft 6, the provision of the rotary shaft 121 does not increase the width of the engine in the direction perpendicular to the crankshaft 6.

As shown in FIG. 7, a water pump 120 is provided on the rotating shaft 121 so as to be positioned within the width of the engine body E in the direction of the crankshaft. A water inlet 123 is provided on the suction side of the water pump 120. Provided and plumbing 12
4 is connected to the outlet side of the radiator 5. As shown in FIG. 5 and FIG.
A regulating valve 125 is built in, and a thermostat 126 is provided on the regulating valve 125 so as to allow the cooling water to flow into the water pump 120 from the pipe 124 when the cooling water in the engine reaches a predetermined temperature. It has become.

As shown in FIG. 10, a discharge port 129 on the discharge side of the water pump 120 is connected to a cooling water inlet 130a provided on the front side surface of the cylinder block 7 on the vehicle. The cooling water is supplied from a cooling water outlet 130b to a cooling water passage 132 formed in the cylinder head 11 through a cooling water passage 131 formed around the rotation axis 121 of the cylinder block 7 from the inlet 130a. The cooling water passage 131 is formed integrally with the cylinder block 7 and has a cooling water inlet 130a.
Is open on the side surface of the bearing 133, and the cooling water outlet 130b
Is opened at the end face of the cylinder block 7 on the cylinder head side. The cooling water inlet 132a of the cooling water passage 132 communicating with the head jacket 135 of the cylinder head 11 is opened at the cylinder block side end surface of the cylinder head 11 so as to correspond to the cooling water outlet 130b of the cooling water passage 131. ,
Since the cooling water passage does not require any special piping, the structure is simple.

As shown in FIG. 5, the cooling water passage 131 formed in the cylinder block 7 communicates with the cooling water passage 132 formed in the cylinder head 11 without joining the block jacket 134 of the cylinder block 7. The cooling water is led from the cooling water passage 132 to a head jacket 135 formed in the cylinder head 11. The cooling water inlet 132a of the head jacket 135 of the cylinder head 11 is
Since the cooling water passage 132 is formed below the intake passage 11c and the intake pipe 41 and the cooling water passage 132 is formed integrally with the cylinder head 11, the cooling water passage 132 is formed in the intake passage 11c and the intake pipe 41.
Therefore, the cooling water passage can be easily arranged.

As shown in FIGS. 8 to 10, the cooling water inlet 130a of the cylinder block 7 is connected to the water pump 120.
Since the water pump 120 is mounted on the cylinder block 7 so as to cover the discharge port 129, a pipe connecting the cooling water inlet 130a and the discharge port 129 is unnecessary. In addition, a cooling water passage 131 and a cooling water inlet 130a formed in the cylinder block 7 are provided with a bearing portion 133 provided to bulge forward from the cylinder block 7 in order to support the first intermediate shaft 16.
And it is not necessary to provide the cylinder block 7 without forming a special protruding portion, so that the engine body E does not become large.

As shown in FIGS. 5 and 10, the water pump 120 is mounted on the cylinder block 7, and the head jacket 135 of the cylinder head 11 is provided with cooling water passages 131, 132 provided independently of the block jacket 134. Since the cooling water is supplied, the water pump 120 can be arranged without interfering with the intake pipe 41 or the exhaust pipe 40 while cooling the cylinder head 11 prior to the cylinder block 7, and the engine unit can be made compact. Can be. Further, the water pump 120 and the cooling water inlet 132a of the head jacket 135 are arranged on both sides of the cylinder block 7 and the cylinder head 11 on the same side parallel to the crankshaft 6, so that the water pump 120 and the cooling water passage 13 are provided.
1 does not overlap with the cylinder block 7 in the crankshaft direction, and the size of the engine unit in the crankshaft direction can be reduced.

As shown in FIGS. 8 and 10, the mounting surface 120a of the water pump 120, the cooling water inlet 132a of the head jacket 135, and the cooling water inlet 130a of the cooling water passage 131 are connected to the cylinder head 11 or the crank of the cylinder block 7. Axis 6
It is sufficient if they are on the side parallel to the axis, and they do not necessarily have to open in the direction perpendicular to the crankshaft 6,
In this embodiment, the opening is provided in the crankshaft direction or the cylinder axis direction. Further, the cooling water passage 131 may be formed by a hose or the like separate from the cylinder block 7. Further, the water pump 120 and the cooling water passage 131 may be provided on the exhaust side.

As shown in FIGS. 11 and 12, the cylinder head 11 is fixedly fastened to the cylinder block 7 by bolts 137 inserted into bosses 136 between the cylinders. The head jacket 135 of the cylinder head 11 has a boss 136,
A rectifying portion 138 is formed around the intake passage 11c and the exhaust passage 11d, and a rectifying portion 138 is provided between the cylinders. The rectifying portion 138 is formed with a guide portion 138a for guiding the cooling water, and the cooling water flows at a predetermined flow rate. It flows and cools. Rectifier 138
The guide portion 138a is provided with its tip end offset from the spark plug 13 by a distance Z toward the exhaust side. The flow of the cooling water in the cylinder head 11 is indicated by arrows in FIGS. 11 and 12.

As shown in FIG. 5, the cooling water in the head jacket 135 of the cylinder head 11 is blocked from a communication passage 139 formed in the lower part of the cylinder head 11 through a communication passage 139 formed in the cylinder block 7. Jacket 13
4 to cool the cylinder block 7. As described above, the cooling water is first introduced to the cylinder head 11 which is heated by the operation of the engine to cool the cylinder head 11, and then the cylinder block 7 is cooled.
For effective engine cooling. A cooling water outlet 140 communicating with a block jacket 134 formed in the cylinder block 7 is formed on the front side of the cylinder block 7, and the cooling water outlet 140 is provided near the water pump 120. A water outlet 127 is attached to the cooling water outlet 140, and the water outlet 127 is connected to the inlet side of the radiator 5 via a pipe 141.

Therefore, the cooling water flows as shown by the central arrow in FIG. That is, when the engine is started and the cooling water reaches a predetermined temperature, the thermostat 126 of the regulating valve 125 is operated to shut off the bypass passage 128, communicate the water inlet 123 with the water pump 120, and connect the radiator 5 The cooling water is sent from the water inlet 123 to the cylinder head 11 and the cylinder block 7 via the water pump 120 to cool it. After cooling the cylinder block 7, it is returned to the radiator 5 through the water outlet 127.

The water outlet 127 is provided with a water temperature sensor 143 and a water temperature sensor 144, as shown in FIG.
The water outlet 127 provided at the cooling water outlet 140
And the water inlet 123 are communicated with each other on the front side of the cylinder block 7 through a bypass passage 128. By providing the water outlet 127, the water inlet 123, and the water pump 120 in parallel and close to each other, the bypass passage 128 Is shortened, piping becomes easy, and heat loss is reduced. Further, since both the water pump 120 and the outlet 127 are mounted on the cylinder block 7, the mounting positions between the two hardly deviate, and the bypass passage 128 can be easily mounted.

As shown in FIG. 13, two cooling water pipes 145 and 146 are provided above the cylinder head 11, and one of the cooling water pipes 145 is provided with a water pump via a heater 147.
120 and the other cooling water pipe 146 is connected to the oil cooler 1
48 and the cooling water pipe 145 to join the water pump 12
Connected to 0. As shown in FIGS. 3 and 4, an exhaust pipe 40 and an intake pipe 41 are connected to each cylinder row of the cylinder head 11, and each intake pipe 41 is connected to a surge tank 42. , Stay 43 supports the cylinder block 7. A throttle valve 44 is provided on the air suction port side of the surge tank 42.

One end of the first intermediate shaft 16 (right end in front view)
1 and 6, a flywheel 45 and a clutch mechanism (not shown) are provided to transmit power to the front axle 2 of the front wheels 3 via a transmission 47. Further, the primary side of the transmission 47 is disposed on the first intermediate shaft 16, and the secondary side is disposed on the counter shaft 48, and rotates the front axle 2 via a gear 49 provided on the front axle 2. .

Further, at the other end of the first intermediate shaft 16, as shown in FIG. 7, an auxiliary device driving pulley 50 is provided, and auxiliary devices such as an alternator 52, a power steering pump 53 and an air conditioner compressor 54 are connected to a belt 55. Driven by 92 is an idler. In this embodiment, as the rotation shaft to which the rotation of the crankshaft 6 is transmitted, the rotation shaft that rotates by the first chain 33 that transmits the rotation of the first intermediate shaft 16 to the second intermediate shaft 31.
Although 121 is used, the rotating shaft may be the first intermediate shaft 16, and a water pump may be provided on the first intermediate shaft 16, and a water pump may be provided on the second intermediate shaft 31. .

[0026]

According to the present invention, the angle .alpha. Between the straight line L2 connecting the axis of the crankshaft and the axis of the first intermediate shaft and the cylinder axis L1 is set to an acute angle in a side view, and the rotational force of the crankshaft is changed. The first intermediate shaft, the second intermediate shaft, the intake valve driving camshaft and the exhaust valve driving camshaft to which the power is transmitted are parallel to the crankshaft and from the position on the straight line L2 in side view to the position on the cylinder axis L1. The first chain is disposed substantially in parallel with the cylinder axis, along the engine body over a location beyond the center. Therefore, the first intermediate shaft, the second intermediate shaft, the camshaft for driving the intake valve and the camshaft for driving the exhaust valve are disposed close to the intake valve side and the low temperature side of the engine body, and the entire engine unit is compact. Become. The length of the first chain between the first intermediate shaft and the second intermediate shaft and the length of the second chain between the second intermediate shaft, the intake valve driving camshaft, and the exhaust valve driving camshaft are both short. Become.

According to the present invention, the crankshaft and the first intermediate shaft are located within the width of the cylinder row, and the transmission for transmitting power from the crankshaft to the first intermediate shaft is located within the width of the cylinder row. The first chain that transmits power from the intermediate shaft to the second intermediate shaft is located within the width of the cylinder row. Therefore,
The length of the cylinder block below the vehicle engine unit in the vehicle width direction has been reduced. Further, the second intermediate shaft, the intake valve driving cam shaft and the exhaust valve driving cam shaft extend outside the width of the cylinder row, and the second intermediate shaft is connected to the intake valve driving cam shaft and the exhaust valve driving cam shaft. The second chain for transmitting power was positioned outside the width of the cylinder row. Therefore, the length of the cylinder head above the vehicle engine unit in the vehicle width direction has become somewhat longer. The space for mounting the vehicle engine is such that the width of the lower cylinder block portion is narrow and the width of the upper cylinder head portion is often somewhat long.

[Brief description of the drawings]

FIG. 1 is a side view showing a state where an embodiment of a vehicle engine unit of the present invention is mounted on a vehicle.

FIG. 2 is a plan view of the mounting state of FIG. 1 as viewed from above.

FIG. 3 is a front view of the embodiment of the vehicle engine unit of the present invention.

FIG. 4 is a partially cutaway side view of the embodiment of the vehicle engine unit of the present invention.

FIG. 5 is a side view in which another part of the embodiment of the vehicle engine unit of the present invention is broken.

FIG. 6 is a sectional view taken along line VI-VI of FIG. 5;

FIG. 7 is a sectional view taken along line VII-VII of FIG. 4;

FIG. 8 is a plan view of a cylinder block of the embodiment of the vehicle engine unit of the present invention.

FIG. 9 is a view as seen from the direction of arrow A in FIG. 8;

FIG. 10 is a cross-sectional view taken along line XX of FIG. 9;

FIG. 11 is a partial longitudinal sectional view of a cylinder head of the embodiment of the vehicle engine unit of the present invention.

FIG. 12 is a sectional view taken along line XII-XII in FIG. 11;

FIG. 13 is a system diagram of a cooling system according to the embodiment of the vehicle engine unit of the present invention.

[Explanation of symbols]

 6 Crankshaft 7 Cylinder block 11 Cylinder head 16 1st intermediate shaft 33 1st chain 35 2nd chain 31 2nd intermediate shaft 37 Intake valve drive cam shaft 37 'Exhaust valve drive cam shaft E Engine body

Claims (1)

(57) [Claims] 1. A vehicle engine unit having an engine body including a cylinder block and a cylinder head, wherein a crankshaft is arranged to extend in a vehicle width direction. The angle α between the straight line L2 connecting the axis of the first intermediate shaft and the cylinder axis L1 is an acute angle, and the first intermediate shaft, the second intermediate shaft, and the intake valve drive for transmitting the rotational force of the crankshaft. The camshaft and the exhaust valve driving camshaft are arranged along the engine body from a position parallel to the crankshaft and on a side view from a position on the straight line L2 to a position beyond a position on the cylinder axis L1.
A transmission for transmitting the power from the crankshaft to the first intermediate shaft is positioned within the width of the cylinder line, and the power is transmitted from the first intermediate shaft to the second intermediate shaft. The first chain is located within the width of the cylinder row and substantially parallel to the cylinder axis, and the second intermediate shaft, the camshaft for driving the intake valve and the camshaft for driving the exhaust valve extend outside the width of the cylinder row. And a second chain for transmitting power from the second intermediate shaft to the intake valve driving camshaft and the exhaust valve driving camshaft is positioned outside the width of the cylinder row.