JPH08338258A - Engine unit for vehicle - Google Patents

Abstract

PURPOSE: To shorten the vehicle lateral length of a lower cylinder block in an engine unit for vehicle and slightly extend the vehicle lateral length of a cylinder head to make the engine unit compact as the whole. CONSTITUTION: An engine unit for vehicle has an engine body E formed of a cylinder block 7 and a cylinder head 11, and a crankshaft 6 is arranged so as to extend in the vehicle lateral direction. The angle formed by a line L2 for connecting the axial center of the crankshaft 6, seen from the side, to the axial center of a first intermediate shaft 16 and a cylinder axial line L1 is set to an acute angle. The first intermediate shaft 16 to which the rotating force of the crankshaft 6 is transmitted, a second intermediate shaft 31, an intake valve driving cam shaft 37 and an exhaust valve driving cam shaft are arranged along the engine body E extending from a position parallel to the crankshaft 6 on the straight line L2, seen from the side, to a position exceeding the position on the cylinder axial line L1. The crankshaft 6 and the first intermediate shaft 16 are situated within the width of the cylinder train, and a first chain 33 for transmitting the power from the first intermediate shaft 16 to the second intermediate shaft 31 is situated within the width of the cylinder train.

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,
There is one in which a crankshaft is arranged so as to extend in the vehicle width direction and a plurality of cylinders are arranged in parallel in the crankshaft direction. Nowadays,
With the emphasis on safety, comfort and comfort of automobiles, the frame of the automobile was determined at the beginning of the design, and then the components of the automobile were designed to fit the frame. Also, in order 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 types of vehicles having different frame sizes, it is necessary to make the engine unit as compact as possible. In addition, in the space for mounting the vehicle engine, the width of the lower cylinder block portion is often narrow, and the width of the upper cylinder head portion is often somewhat long. The present invention has been made in view of such circumstances, and in the 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 lengthened somewhat. The challenge is to make it compact as a whole.

[0004]

In order to solve the above-mentioned problems, the present invention has an engine body composed of a cylinder block and a cylinder head, and a crankshaft is arranged so as to extend in the vehicle width direction. In the vehicle engine unit described above, the angle α formed by the cylinder axis L1 and the straight line L2 connecting the axis of the crankshaft and the axis of the first intermediate shaft in side view.
Is an acute angle, and the first intermediate shaft, the second intermediate shaft, the intake valve driving cam shaft, and the exhaust valve driving cam shaft to which the rotational force of the crankshaft is transmitted are parallel to the crankshaft and are straight lines L2 in a side view.
It is arranged 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 supplied from the crankshaft to the first intermediate shaft. The transmission device for transmission is located within the width of the cylinder row, the first chain for transmitting power from the first intermediate shaft to the second intermediate shaft is located within the width of the cylinder row, and is arranged 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. It is characterized in that the second chain to be transmitted is positioned outside the width of the cylinder row.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the accompanying drawings. 1 and 2, reference numeral 1 denotes an engine compartment of an automobile, which is formed above and between left and right front wheels 3 connected by a front axle 2. An engine unit 4 of a 4-stroke 6-cylinder engine is mounted in the engine compartment 1, 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, the crankshaft 6 of the engine unit is axially supported between a cylinder block 7 and a bearing case 8 and is connected to a piston 9 provided in each cylinder by a connecting rod 10. There is. 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 an ignition plug 13 is provided 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 of the engine (cylinder row) is inclined rearward of the vehicle with respect to the vertical direction, and the first intermediate shaft (output output) for extracting the output of the crankshaft 6 is used. Shaft 16, the second intermediate shaft 31 to which the rotational force of the crankshaft 6 is further transmitted, the intake valve driving cam shaft 37, and the exhaust valve driving cam shaft 37 'are arranged in parallel with the crankshaft 6. An oil tank 15 storing oil is located obliquely below and 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. 4 and 5. It is like this. Further, the angle α formed by the cylinder axis L1 and the straight line L2 connecting the crank axis and the axis of the first intermediate shaft 16 is an acute angle. Then, in a side view, the first intermediate shaft 16, the second intermediate shaft 31, the intake valve driving cam shaft 37, and the exhaust valve driving cam shaft 37 'are obliquely above and above the crankshaft 6 (position on the straight line L2). It is arranged along the engine body to the upper rear side (a portion extending to the right beyond the position on the cylinder axis L1). Therefore, the distance between the cylinder axis L1 and the first intermediate shaft 16 is short, and the distance between the first intermediate shaft 16 and the second intermediate shaft 31 is also short.

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

The oil stored in the oil tank 15 is the first
By driving an oil supply pump 24 provided on the intermediate shaft 16, a strainer 25 arranged at the bottom of the oil tank 15 and a pipe
Inhaled via 26. After that, through the oil cooler 22 and the oil filter 23, the oil passage 14b formed in the oil pan 14, the oil passage 8a formed in the bearing case 8, the cylinder block 7 and the cylinder head 11
The oil is fed to each part of the engine through the oil passages 7a and 11a formed in the. 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 shown by arrows in FIG. An oil inlet 15 a 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 this gear 28 is a gear 29 provided on the first intermediate shaft 16.
And a transmission device for transmitting power from the crankshaft 6 to the first intermediate shaft 16 is located within the width of the cylinder row. The power transmission from the crankshaft 6 to the first intermediate shaft 16 is a gear.
The chain is not limited to 28 and 29, and may be a chain. First
The first chain 33 that transmits 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 arranged substantially parallel to the cylinder axis L1 (see FIG. 4). The second intermediate shaft 31, the intake valve driving cam shaft 37, and the exhaust valve driving cam shaft 37 'are extended outside the width of the cylinder row, and the second intermediate shaft 31 drives the intake valve driving cam shaft 37 and the exhaust valve driving. For cam shaft
Position the second chain 35 that transmits power to 37 'outside the width of the cylinder row.

As shown in FIG. 4, the second intermediate shaft 31 is positioned on the front side of the engine body E so that the cylinder head 11 can be positioned.
The gear 30 provided on the first intermediate shaft 16 is connected to the gear 32 of the second intermediate shaft 31 via the first chain 33. Further, the gear 34 provided on the second intermediate shaft 31
Is the gear 38 of the intake valve driving cam shaft 37 of the valve mechanism 36 and the gear 3 of the exhaust valve driving cam shaft 37 'through the second chain 35.
The intake valve driving camshaft 37 and the exhaust valve driving camshaft 37 'are connected to the rotary shaft 8'by the rotation of the crankshaft 6. The cylinder head 11 supporting the second intermediate shaft 31 has a mounting opening 11 for both gears 32, 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.

So that it is located in front of the engine body E,
A rotary shaft 121 for driving the water pump 120 has a crankshaft 6 and a first intermediate shaft 16 on the front side of the cylinder block 7.
A gear 12 that is axially supported in parallel with
2 is meshed with the first chain 33, and the rotation of the crankshaft 6 causes the rotation shaft 121 to rotate together. The rotary shaft 121 is shown in FIG.
Is provided on the same side as the first intermediate shaft 16 for extracting the power of the crankshaft 6 with respect to the cylinder axis L1,
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 engine width in the direction perpendicular to the crankshaft 6.

As shown in FIG. 7, a water pump 120 is provided on the rotary shaft 121 so as to be positioned within the width of the engine body E in the crankshaft direction. A water inlet 123 is provided on the suction side of the water pump 120. Provided and plumbing 12
It is connected to the outlet side of the radiator 5 via 4. As shown in FIGS. 5 and 13, the water inlet 123 has
A regulating valve 125 is built in, and this regulating valve 125 is provided with a thermostat 126 so as to allow the cooling water to flow from the pipe 124 to the water pump 120 when the cooling water in the engine reaches a predetermined temperature. It has become.

As shown in FIG. 10, the discharge port 129 on the discharge side of the water pump 120 is connected to a cooling water inlet 130a provided on the vehicle front side surface of the cylinder block 7, and the cooling water is the cooling water. The water is supplied from the inlet 130a to the cooling water passage 132 formed in the cylinder head 11 through the cooling water passage 131 formed around the rotary shaft 121 of the cylinder block 7. The cooling water passage 131 is formed integrally with the cylinder block 7, and has a cooling water inlet 130a.
Is opened on the side surface of the bearing 133, and the cooling water outlet 130b
Is opened at the end surface 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 end surface of the cylinder head 11 on the cylinder block side so as to correspond to the cooling water outlet 130b of the cooling water passage 131. ,
The cooling water passage does not require any special piping, so 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. Then, the cooling water is guided from the cooling water passage 132 to the 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 opened below the intake passage 11c and the intake pipe 41 and 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.
Since it does not interfere with, it is easy to handle the cooling water passage.

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 attached to the cylinder block 7 so as to be covered with the discharge port 129, the pipe connecting the cooling water inlet 130a and the discharge port 129 is unnecessary. Further, the cooling water passage 131 and the cooling water inlet 130a formed in the cylinder block 7 support the first intermediate shaft 16, so that the bearing portion 133 is provided so as to bulge forward from the cylinder block 7.
Since it is formed on the side surface of the engine block, and it is not necessary to provide the cylinder block 7 without forming a special projecting portion, the engine body E does not become large.

As shown in FIGS. 5 and 10, the water pump 120 is attached to the cylinder block 7, and the head jacket 135 of the cylinder head 11 is provided with cooling water passages 131 and 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, thus making the engine unit compact. You can Further, since the cooling water inlets 132a of the water pump 120 and 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, the water pump 120 and the cooling water passage 13 are arranged.
Since 1 does not overlap with the cylinder block 7 in the crank axis direction, the dimension of the engine unit in the crank axis direction can be shortened.

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 the cranks of the cylinder head 11 or the cylinder block 7. Axis 6
It suffices if they are on the side surface parallel to, and these do not necessarily have to open in the direction perpendicular to the crankshaft 6,
In this embodiment, the opening is open in the crankshaft direction or the cylinder shaft direction. Further, the cooling water passage 131 may be formed by a hose or the like that is 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 fastened and fixed to the cylinder block 7 by bolts 137 inserted through boss portions 136 between the cylinders. The head jacket 135 of the cylinder head 11 has a boss 136,
Formed around the intake passage 11c and the exhaust passage 11d, a rectifying portion 138 is provided between the cylinders, and a guide portion 138a for guiding cooling water is formed in the rectifying portion 138 so that the cooling water has a predetermined flow velocity. It is designed to flow and cool. Rectifier 138
The guide portion 138a is provided such that its tip is offset from the ignition plug 13 toward the exhaust side by a distance Z. The flow of cooling water in the cylinder head 11 is shown 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 the communication passage 139 formed in the lower portion of the cylinder head 11 through the communication passage 139 formed in the cylinder block 7. For jacket 13
4 to cool the cylinder block 7. In this way, the cooling water is first introduced to the cylinder head 11 which becomes hot during the operation of the engine for cooling, and then the cylinder block 7
To ensure effective engine cooling. A cooling water outlet 140 communicating with a block jacket 134 formed on the cylinder block 7 is formed on the front side of the cylinder block 7, and the cooling water outlet 140 is provided in the vicinity of 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 adjusting valve 125 operates to shut off the bypass passage 128 and connect the water inlet 123 and the water pump 120 to each other, and the radiator 5 The cooling water from the 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.
Water outlet 127 provided at this cooling water outlet 140
And the water inlet 123 are communicated with each other by a bypass passage 128 in the front side portion of the cylinder block 7. 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 provided. Is shortened, piping is facilitated, and heat loss is reduced. Further, since both the water pump 120 and the outlet 127 are attached to the cylinder block 7, the attachment position is unlikely to be displaced between them, and the bypass passage 128 can be attached easily.

As shown in FIG. 13, two cooling water pipes 145 and 146 are provided above the cylinder head 11, and one cooling water pipe 145 is provided with a water pump via a heater 147.
120 is connected to the other cooling water pipe 146 and the oil cooler 1
The water pump 12 merges with the cooling water pipe 145 via 48.
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 in the cylinder head 11, each intake pipe 41 is connected to a surge tank 42, and the surge tank 42 is The stay 43 is supported by the cylinder block 7. A throttle valve 44 is provided on the air intake 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 the transmission 47. The primary side of the transmission 47 is arranged on the first intermediate shaft 16, the secondary side is arranged on the counter shaft 48, and the front axle 2 is rotated via the gear 49 provided on the front axle 2. .

Further, at the other end of the first intermediate shaft 16, an accessory driving pulley 50 is provided as shown in FIG. 7, and an accessory such as an alternator 52, a power steering pump 53 and an air conditioner compressor 54 is attached 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 is rotated 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 rotary shaft may be the first intermediate shaft 16, and the water pump may be provided on the first intermediate shaft 16 and the water pump may be provided on the second intermediate shaft 31. .

[0026]

According to the present invention, the angle α formed by the straight line L2 connecting the axis of the crankshaft and the axis of the first intermediate shaft and the cylinder axis L1 in side view is an acute angle, and the rotational force of the crankshaft is increased. The first intermediate shaft, the second intermediate shaft, the intake valve driving cam shaft, and the exhaust valve driving cam shaft, which are parallel to the crankshaft and are located on a straight line L2 in a side view on a cylinder axis L1. The first chain is arranged substantially parallel to the cylinder axis along the engine body. Therefore, the first intermediate shaft, the second intermediate shaft, the intake valve driving cam shaft and the exhaust valve driving cam shaft are arranged close to the intake valve side and the low temperature side of the engine body, and the engine unit as a whole is made 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 and the intake valve driving cam shaft and the exhaust valve driving cam shaft are both short. Become.

In the present invention, the crankshaft and the first intermediate shaft are positioned within the width of the cylinder row, and the transmission for transmitting power from the crankshaft to the first intermediate shaft is positioned 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 in the vehicle width direction of the cylinder block below the vehicle engine unit has become shorter. Further, the second intermediate shaft, the intake valve driving cam shaft and the exhaust valve driving cam shaft are extended outside the width of the cylinder row, and the second intermediate shaft is changed to the intake valve driving cam shaft and the exhaust valve driving cam shaft. The second chain that transmits 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 is somewhat longer. In the space where the vehicle engine is mounted, the width of the lower cylinder block portion is often narrow and the width of the upper cylinder head portion is often somewhat long, so that it is possible to meet such a request.

[Brief description of drawings]

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

FIG. 2 is a plan view of the mounted state of FIG. 1 seen 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 cut away.

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

7 is a sectional view taken along line VII-VII in FIG.

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

9 is a diagram viewed from the direction of arrow a in FIG.

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

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

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

FIG. 13 is a system diagram of a cooling system of an 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 driving camshaft 37 'Exhaust valve driving camshaft E Engine body

Claims (1)

[Claims] 1. A vehicle engine unit having an engine body composed of a cylinder block and a cylinder head, wherein the crankshaft is arranged so as to extend in the vehicle width direction. A straight line L2 connecting the shaft center of the first intermediate shaft and the cylinder axis L1 form an acute angle α, and the first intermediate shaft, the second intermediate shaft, and the intake valve drive for transmitting the rotational force of the crankshaft. The cam shaft and the exhaust valve driving cam shaft are arranged along the engine main body from a position parallel to the crank shaft and beyond a position on the straight line L2 to a position on the cylinder axis L1 in a side view.
The intermediate shaft is located within the width of the cylinder row, and a transmission device that transmits power from the crankshaft to the first intermediate shaft is located within the width of the cylinder row, and 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 is arranged substantially parallel to the cylinder axis, and the second intermediate shaft, the intake valve driving cam shaft and the exhaust valve driving cam shaft are extended outside the cylinder row width. A vehicle engine unit characterized in that a second chain for transmitting power from the second intermediate shaft to the intake valve driving cam shaft and the exhaust valve driving cam shaft is positioned outside the width of the cylinder row.