JP2829526B2 - Engine unit for vehicle - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an engine unit for a vehicle, and more particularly to a vehicle engine unit in which a camshaft for driving an intake valve and an exhaust valve is arranged at a cylinder head above a combustion chamber. Regarding the engine unit.

2. Description of the Related Art There is known a vehicle engine in which an intake valve and an exhaust valve are driven by a camshaft supported on a cylinder head. In this type of vehicle engine, a sprocket is provided on a crankshaft, and a camshaft is driven by a winding transmission band wound around the sprocket.

Also, some conventional vehicle engine units are provided with a relatively large-diameter clutch at the crankshaft end, for example, a dry single-plate friction clutch for a manual transmission, a torque converter for an automatic transmission, and the like. .

[Problems to be Solved by the Invention] As described above, since the sprocket for driving the camshaft is provided on the crankshaft, the vehicle engine unit tends to be longer in the crankshaft direction.

By the way, in an automobile, for example, the body frame often passes below the engine unit, that is, over the extension of the crankshaft. If the body frame is elongated in the crankshaft direction as described above, the engine unit and the body frame may interfere with each other. As a result, it was difficult to mount the engine unit.

For this reason, an output extraction shaft for extracting the output of the crankshaft is provided diagonally above the crankshaft, and an intermediate shaft is provided above the output extraction shaft along the cylinder axis, and a space between the intermediate shaft and the output extraction shaft is provided. When the first winding transmission means is connected and the cam shaft and the intermediate shaft are connected by the second winding transmission means, the sprocket driving the winding transmission means does not overlap with the crankshaft, and the lower part of the engine unit Can be shortened in the crankshaft direction, which is advantageous in mounting.

On the other hand, in the conventional engine unit, since a relatively large-diameter clutch is provided at the end of the crankshaft, there has been a problem that, for example, the clutch protrudes downward from the oil pan and the engine height becomes high.

For this reason, when the clutch is provided on the output take-out shaft and the mounting position of the clutch is raised, it is possible to prevent the clutch from projecting downward from the oil pan, but the clutch overlaps the crankshaft when viewed in the crankshaft direction. If the intermediate shaft for the winding drive band is provided above the output take-out shaft as described above, the clutch and the intermediate shaft may interfere depending on the mounting position of the intermediate shaft. Since the clutch could not be installed at a sufficiently high position, there was room for consideration in making the engine compact.

The present invention has been made in view of such circumstances.
It is an object of the present invention to provide an engine unit for a vehicle in which the length of a portion around a lower part of the engine unit in the direction of the crankshaft is shortened to be advantageous in mounting, and the engine height is reduced.

[Means for Solving the Problems] In order to solve the problems, the present invention is configured as follows.

The invention according to claim 1 is described as follows.
An output take-out shaft for taking out the output of the crankshaft is supported in parallel with the crankshaft, and the clutch is attached to the output take-up shaft so as to overlap a range formed by rotation of the crankshaft crank in the crankshaft direction. And an intermediate shaft is axially supported on the cylinder head by being located above the output take-out shaft along the cylinder axis, and the intermediate take-up shaft and the output take-out shaft are connected by first winding transmission means. And a cam shaft for driving the intake and exhaust valves and the intermediate shaft connected by a second winding transmission means. ].

According to the first aspect of the present invention, the output of the crankshaft can be extracted by the output extraction shaft from a position higher than the crankshaft without overlapping the range formed by the rotation of the crankshaft of the crankshaft. Therefore, the length of the lower part of the engine unit in the direction of the crankshaft is reduced. The rotation of the crankshaft is transmitted from the output take-out shaft to the intermediate shaft of the cylinder head by the first winding transmission means, and further transmitted from the intermediate shaft to the camshaft arranged above the combustion chamber by the second winding transmission means. The operation of the camshaft opens and closes the intake valve and the exhaust valve at a predetermined timing.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a side view showing a state where a vehicle engine unit of the present invention is mounted, FIG. 2 is a plan view thereof, FIG. 3 is a side view of the vehicle engine unit, and FIG. 4 is a front view of the vehicle engine unit. FIG. 5, FIG. 5 and FIG. 6 are side views of the vehicle engine unit with a part cut away, and FIG.
VII-VII sectional view, FIG. 8 is a side view showing a power transmission mechanism from the crankshaft to the camshaft, FIG. 9 is a sectional view taken along the line IX-IX of FIG. 6, FIG. 10 and FIG. FIG. 10 shows the arrangement of the first winding transmission means and the second winding transmission means.
FIG. 11 is a plan view, as viewed in the direction B in FIG.

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. By arranging the crankshaft 6 of the engine so as to face the vehicle width direction, the engine room 1 is narrowed, and accordingly the vehicle room is widened.

As shown in FIGS. 5 to 7, the crankshaft 6 of the engine is supported between a cylinder block 7 and a bearing case 8, and a connecting rod 10 is provided on a piston 9 provided in a cylinder row formed in the cylinder block 7. Are connected by

A cylinder head 11 is mounted on the cylinder block 7 to form an engine body E.
11, a head cover 12 is provided, and a spark 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. 5 and 6, the cylinder row of the engine is inclined rearward of the vehicle with respect to the vertical direction, and an output extraction shaft 16 for extracting the output of the crankshaft 6 is provided in parallel with the crankshaft 6. Further, the output take-out shaft 16 is disposed obliquely above the crankshaft 6. An oil tank 15 storing oil is positioned below the output take-out shaft 16 and the crankshaft 6 obliquely below, so that the oil tank 15 is located in FIG.
In FIG. 6 and FIG. 6, the vehicle faces the front of the vehicle indicated by the arrow FWD. Further, by making the angle α between the cylinder axis L1 and the line L2 connecting the crankshaft center and the output extraction axis an acute angle, the interval between the output extraction shaft 16 and the front axle 2 can be shortened. The longitudinal direction can be shortened.

As shown in FIG. 5, a pair of oil passages 17 is formed in the oil pan 14 in a vertical direction, and the oil accumulated in the oil pan 14 is supplied to a discharge pump 16 provided on an output extraction shaft 16.
The oil is sucked from the suction port 17a below the oil passage 17 by the 18, 18 and is sent to the oil tank 15. The oil pan
The oil tank 14 and the oil tank 15 are separated by a wall provided with an oil passage 17.

The oil stored in the oil tank 15 is driven by an oil supply pump 24 provided on the output take-out shaft 16 to drive the oil tank 15.
Is sucked in through a strainer 25 and a pipe 26 arranged at the lowermost part of the pipe. Thereafter, the oil is supplied to each part of the engine through an oil cooler 22 and an oil filter 23. The flow of the oil is indicated by an arrow in FIG.

As shown in FIGS. 7 to 9, a gear 28 is formed on the crankshaft 6 by a crank arm. The gear 28 meshes with a gear 29 provided on the output take-out shaft 16. This gear 28
Between the gear 29 and the gear 29, the rotation of the crankshaft 6 is reduced by 0.8.

The power transmission from the crankshaft 6 to the output take-out shaft 16 is not limited to the gears 28 and 29, but may be a chain.
The position can also be arbitrarily selected at the shaft end of the crankshaft 6 or in the middle of the crankshaft 6.

The intermediate shaft 31 is pivotally supported by the cylinder head 11 so as to be located on the side of the cylinder block 7, and the gear 30 provided on the output take-out shaft 16 is connected to the gear 32 of the intermediate shaft 31 by first winding transmission means. For example, 0.9 is connected through a certain first chain 33.
The gear 34 provided on the intermediate shaft 31 is further connected to a gear 38 of a cam shaft 37 of a valve mechanism 36 via a second chain 35 serving as a second winding transmission means, and the gear 34 is reduced by, for example, 0.7. The cam shaft 37 is rotated by the rotation of the shaft 6. Thus, the rotation of the crankshaft 6 is
By reducing the speed in three stages of the gears 28 and 29, the first chain 33, and the second chain 35 and transmitting the reduced speed to the camshaft 37, the diameter of the gear 38 on the camshaft 37 can be reduced. . By the rotation of the cam shaft 37, the integrally formed cam 39 pushes the intake valve 100 and the exhaust valve 101 at a predetermined valve timing to open and close the intake passage 11a and the exhaust passage 11b formed in the cylinder head 11. It has become. 103 is a fuel injector.

As shown in FIG. 9, a gear 106 of a drive shaft 105 of the water pump 104 is engaged with the first chain 33.
05 is supported by the cylinder block 7. As shown in FIG. 8, the first chain 33 includes a chain guide 107 and a chain tensioner 108 provided on the cylinder block 7.
The vibration is prevented. Similarly, the second chain 35 also includes a chain guide 10 provided on the cylinder head 11.
9 and chain guide 11 attached to cam cap 102
0, and a chain tensioner 111 provided on the cylinder head 11 prevents run-out.

The intermediate shaft 31 is located above the output take-out shaft 16 and
a, and the cylinder chain 11 is supported by the cylinder head 11 at a position below the intake pipe 41 leading to the surge tank 42, and the first chain 33 is along the cylinder axis, as shown in FIGS. 9 to 11. So, on one side of cylinder X1, cylinder X1 and cylinder
X2 and the second chain 35 is the cylinder X1
On the other side of the engine.

The intermediate shaft 31 may be provided above the intake pipe 41, but if it is provided below the intake pipe 41 as in this embodiment, in combination with the second chain 35 being provided on the engine side,
By preventing the chain from passing between the intake pipes of adjacent cylinders, the engine width in the crankshaft direction can be further reduced.

When the exhaust pipe 40 is provided at the position of the intake pipe 41, the intermediate shaft 31 is provided at a position below the exhaust pipe 40.

As shown in FIGS. 9 and 10, the gear 32 and a bulging portion 115 provided on the cylinder head 11 so as to cover the gear 32.
Is provided so as to enter between the intake ports 11c of the adjacent cylinders X1 and X2. Therefore, even though the intermediate shaft 31 is supported by the cylinder head 11, the mounting interval of the intake pipe 41 does not increase.

The place where the first chain 33 and the second chain 35 are arranged is not particularly limited. For example, the first chain 33 is connected to the cylinder X2 and the cylinder X2.
It may be arranged between X3. Also, the first chain 33 can be moved along the second chain 35, or the second chain
It can be arranged on the side opposite to the chain 35.

In the case of automobiles, the body frame often passes under the engine, but the chains 33 and 35 for driving the camshaft 37 are used.
Since the output for driving the engine is taken out from the output take-out shaft 16 arranged above the crankshaft 6, the dimension in the crankshaft direction at the lower part of the engine is shortened, and the engine unit is mounted without interfering with the body frame. be able to.

Further, since the intermediate shaft 31 is provided on the cylinder head 11, when the cylinder head 11 is removed for maintenance of the engine, it is only necessary to remove the first chain 33, and the second chain 35 includes the intermediate shaft 31 and the cam shaft 37. , The cam timings of the intake camshaft and the exhaust camshaft do not fluctuate and the cam timing is not shifted, so that the maintenance work is easy.

The cylinder head 11 supporting the intermediate shaft 31 has mounting openings 112, 113 for both gears 32, 34 of the intermediate shaft 31, the mounting opening 112 is covered with a cap 114, and the mounting opening 113 is It is covered with a cover 116.

The mounting opening 112 on the side to which the first chain 33 is connected is opened obliquely upward, so that a tool can be inserted from above to easily attach and detach the gear 32 of the intermediate shaft 31 and the first chain 33. It has become.

A flywheel 45 and a dry single-plate friction clutch 400 for manual transmission are provided at one end of the output take-out shaft 16 so as to overlap with the crankshaft 16 in the crankshaft direction as shown in FIG. Power is transmitted to the front axle 2 of the front wheel 3 via the motor 47. The reason that the friction clutch 400 overlaps the crankshaft 16 in the crankshaft direction does not overlap the range D1 formed by the shaft portion 6a of the crankshaft 6 that is supported by the cylinder block 7, but the crankshaft 6 This means that the arc 6b overlaps with the range D2 formed by the rotation.

The friction clutch 400 is configured as shown in FIG. 7, and a pressure plate 402 is supported by a clutch cover 401 so as to be able to move forward and backward, and the pressure plate 402 is moved forward and backward by a spring 403. When the pressure plate 402 presses against the clutch disk 404, the clutch is connected, and the torque of the output take-out shaft 16 is transmitted to the transmission 47 via the transmission input shaft 405.

As described above, by providing the flywheel 45 and the large-diameter friction clutch 400 on the output take-out shaft 16, the engine height can be reduced as compared with the case where the flywheel 45 and the large-diameter friction clutch 400 are provided on the crankshaft 6. Moreover, the intermediate shaft 31 provided above the output take-out shaft 16
Of the friction clutch 40
By bringing 0 closer to the intermediate shaft 31, the output take-out shaft 16 is supported at a higher position, so that the large-diameter friction clutch 400 does not protrude downward from the oil pan 14 and the engine height is reduced. It can be even lower.

The primary side of the transmission 47 is disposed on the output 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 axle 2.

The friction clutch 400 and the transmission 47 are covered with a transmission case 406. The transmission case 406 is provided so as to be joined to a side surface of the cylinder block 7, and as shown in FIGS. The two chains 35 are provided so as to cover the upper part of the transmission case 406.

An auxiliary drive pulley 50 is provided at the other end of the output take-out shaft 16 as shown in FIG. 3, and the auxiliary drive such as an alternator 52, a power steering pump 53, and an air conditioner compressor 54 A belt 55 is stretched around the pulley. 92 is an idler.

FIG. 12 is a sectional view of a vehicle engine unit showing another embodiment of the present invention.

The embodiment shown in FIGS. 1 to 11 is an engine unit for a vehicle having a manual transmission, whereas the embodiment shown in FIG. 12 is an engine unit for a vehicle having an automatic transmission. Therefore, the description is omitted.

A drive plate 500 is fixed to an end of the output take-out shaft 16 with bolts 501, and a pump impeller 503 of a torque converter 502 constituting an automatic transmission is fixed to the drive plate 500 with bolts 504. Turbine runner 505 facing pump impeller 503
The turbine runner 505 is provided with a transmission input shaft 506.
And a stator 507 is provided on the stator shaft 509 via a one-way clutch 508.

Therefore, the rotation of the crankshaft 6 is transmitted to the output take-out shaft 16 via the gears 28 and 29, and further transmitted to the torque converter 502 via the drive plate 500. Here, the rotational force of the pump impeller 503 is transmitted to the turbine runner 505 via a fluid, whereby the transmission input shaft 506 is rotated, and the rotation is transmitted to the front axle via a planetary gear unit (not shown), and the torque converter is driven. 502 constitutes a clutch.

[Effect of the Invention] As described above, the vehicle engine unit of the present invention pivotally supports the output take-out shaft for taking out the output of the crankshaft obliquely above the crankshaft, and extends upward along the cylinder axis of the output take-out shaft. And the intermediate shaft is supported by the cylinder head, and the intermediate shaft and the output take-out shaft are connected by the first winding transmission means. The cam shaft driving the intake / exhaust valve and the intermediate shaft are connected. Since it is connected by the second winding transmission means, the output of the crankshaft can be taken out from a position higher than the crankshaft without overlapping the range formed by the rotation of the crankshaft of the crankshaft. , The length in the crankshaft direction is shortened, and mounting can be performed easily.

Also, an output take-out shaft is supported diagonally above the crankshaft,
A clutch is provided on the output take-out shaft so as to overlap a range formed by rotation of the crankshaft of the crankshaft when viewed in the crankshaft direction. Since the intermediate shaft is supported by the cylinder head, the output take-out shaft is supported at a higher position by bringing the clutch closer to the intermediate shaft, and the large-diameter clutch may protrude downward from the oil pan. And the engine height can be further reduced.

[Brief description of the drawings]

1 is a side view showing a state where a vehicle engine unit of the present invention is mounted, FIG. 2 is a plan view thereof, FIG. 3 is a side view of the vehicle engine unit, and FIG. 4 is a front view of the vehicle engine unit. 5, FIG. 5 and FIG. 6 are side views of the vehicle engine unit with a part cut away, and FIG. 7 is VI of FIG. 5.
I-VII sectional view, FIG. 8 is a side view showing a power transmission mechanism from the crankshaft to the camshaft, FIG. 9 is an IX-IX sectional view of FIG. 6, FIG. 10 and FIG. FIG. 10 shows the arrangement of the first winding transmission means and the second winding transmission means.
11 is a plan view, and FIG. 12 is a sectional view of a vehicle engine unit showing another embodiment of the present invention. In the figure, reference numeral 1 denotes an engine compartment, 6 denotes a crankshaft, 7 denotes a cylinder block, 8 denotes a bearing case, 11 denotes a cylinder head, 16
Is an output take-out shaft, 33 is a first chain (first winding transmission means), 31 is an intermediate shaft, 35 is a second chain (second winding transmission means), 37 is a cam shaft, 39 is a cam, and 45 is a fly. Wheel, 40
0 is a friction clutch, 500 is a drive plate, 502 is a torque converter as a clutch, X1, X2, X3 are cylinders, and E is an engine body.

Claims (1)

(57) [Claims] An output take-off shaft for taking out output of a crankshaft is supported obliquely above the crankshaft in parallel with the crankshaft, and the crankshaft of the crankshaft rotates in the crankshaft as viewed in the crankshaft direction. A clutch is provided so as to overlap the range formed by the above, and furthermore, an intermediate shaft is supported on a cylinder head located above the cylinder axis of the output take-out shaft, and the intermediate take-up shaft and the output take-out shaft are connected to each other. The engine unit for a vehicle, wherein the first and second winding transmission means are connected by a first winding transmission means, and the cam shaft for driving the intake and exhaust valves and the intermediate shaft are connected by a second winding transmission means.