JP2003254079A - V-engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To firmly support an output shaft when the output shaft is provided on the cylinder head side past a crankshaft. <P>SOLUTION: This V-engine is so formed that intake and exhaust valves are driven respectively by intake and exhaust cams provided in a cylinder head 7. A valve drive shaft 25 is rotatably provided inside a V-bank and oppositely to the crankshaft 2 across the output shaft 12. The power of the crankshaft 2 is transmitted to the valve drive shaft 25 by a chain 54 extending from the output shaft 12. The power is transmitted from the valve drive shaft 25 to the intake and exhaust camshafts 7 by a timing chain 55 and a chain type transmission means. The output shaft 12 is rotatably supported at both ends by bearings 28 and 29. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a V-type engine having an output shaft provided inside a V bank and closer to a cylinder head than a crank shaft.

[0002]

2. Description of the Related Art As a conventional V-type engine of this type,
For example, there is one disclosed in JP-A-7-293268. The V-type engine shown in this publication is provided with an OHV type valve operating device having a cam shaft at a portion corresponding to the valley bottom of a V bank, and an output shaft is arranged on the same axis as the cam shaft. ing. The cam shaft is provided in a portion of the cylinder body closer to the cylinder head than the crank shaft so as to be parallel to the crank shaft, and is geared to one end of the crank shaft in the axial direction. The output shaft is connected to the shaft end of the cam shaft via a rubber member. The reason why the rubber member is interposed in the power transmission system of the output shaft in this way is to prevent vibration in the rotation direction of the crankshaft from being transmitted to the output shaft.

The output shaft is formed so as to penetrate through a gear cover that covers the gear coupling portion from the outside and project outward, and the portion that penetrates the gear cover is rotatably supported by the gear cover via a bearing. ing. Since the gear cover is fixed to the crankcase and the cylinder body, the output shaft is supported by the crankcase and the cylinder body via the gear cover.

[0004]

However, in the V-type engine constructed as described above, the output shaft is only supported by what is called a cantilever support, and moreover,
Since only one end of the output shaft is connected to the cam shaft via the rubber member, there is a problem that the output shaft cannot be firmly supported. Therefore, this conventional V-type engine cannot be put to practical use as, for example, an automobile engine.

The present invention has been made to solve the above problems, and an object thereof is to firmly support the output shaft when the output shaft is provided on the cylinder head side of the crankshaft.

[0006]

To achieve this object, a V-type engine according to the present invention has an output shaft provided inside a V-bank and closer to a cylinder head than a crank shaft in parallel with the crank shaft. In a V-type engine that transmits the rotation of the crankshaft to the output shaft, the intake / exhaust valve is driven by a camshaft provided in the cylinder head, and the inside of the V bank is opposite to the crankshaft from the output shaft. A valve drive shaft is rotatably mounted on the valve drive shaft, and the power of the crankshaft is transmitted to the valve drive shaft by the first transmission means extending from the output shaft side, and the valve drive shaft is transmitted from the valve drive shaft by the second transmission means. The power is transmitted to the cam shaft, and both ends of the output shaft are rotatably supported by bearings.

According to the present invention, power is transmitted from the output shaft side to the valve drive shaft via the first transmission means, and power is transmitted from the valve drive shaft to the cam shaft via the second transmission means. Therefore, the valve train member can be provided on the opposite side of the crankshaft from the output shaft, and the axial length of the output shaft is not restricted by the valve train member. Therefore, it is possible to widen the distance between the bearings that support both ends of the output shaft.

A V-type engine according to a second aspect of the present invention is the V-type engine according to the first aspect of the present invention, wherein the output shaft is formed so as to penetrate from one end side to the other end side of the cylinder body. The one end of the output shaft is connected to the crankshaft and the other end is formed as the output end. According to the present invention, since the output shaft can be supported by the one end portion and the other end portion of the engine, the interval between the portions supporting the output shaft can be widened to the maximum.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION (First Embodiment) An embodiment of a V-type engine according to the present invention will be described below with reference to FIGS.
It will be described in detail by. Here, an example in which the V-type engine according to the present invention is applied to an automobile V-type engine will be described. FIG. 1 is a side view of a V-type engine according to the present invention, which is drawn in a state of being mounted on a front portion of an automobile.
FIG. 2 is a rear view showing one end of the V-type engine according to the present invention, which is drawn with the transmission case cover removed. FIG. 3 is an enlarged sectional view showing one end of the V-type engine according to the present invention. The fracture position in FIG. 3 is shown in FIG.
Shown by line II. FIG. 4 is a sectional view showing an example in which another auxiliary machine is provided on the valve drive shaft.

In these figures, the reference numeral 1 designates an automobile V-type engine according to this embodiment. This engine 1 is of a multi-cylinder type in which a plurality of cylinders are provided in one cylinder row and the other cylinder row of a V bank, and the axis of a crankshaft 2 (see FIGS. 2 and 3) is a vehicle body 3 of an automobile. It is mounted in the engine compartment 4 in the front part of the vehicle body while being oriented in the front-back direction. In FIG. 1, 5 is a crankcase of the engine 1, 6 is a cylinder body, 7 is a cylinder head, 8 is a head cover, 9 is a front wheel, 10 is a rear wheel, and 11 is a hood for opening and closing the engine compartment 4. Show.

As shown in FIGS. 2 and 3, the crankshaft 2 is rotatably supported by the crankcase 5 and the cylinder body 6 in a state of being sandwiched between the crankcase 5 and the cylinder body 6 as in the conventional V-type engine. As shown in FIG. 3, one end in the axial direction (the right end in FIG.
The rear end) is projected outward from the crankcase 5 and the cylinder body 6. An output shaft 12, which will be described later, is connected to the projecting end portion via a gear type transmission means 13. The engine 1 according to this embodiment is mounted on the front portion of the vehicle body 3 such that the one end is located on the vehicle body center side. Therefore, the two cylinder columns forming the V bank of the engine 1 are located on the left side and the right side of the vehicle body. The cylinder row on the left side of the vehicle body is indicated by reference numeral 14 in FIG.
, And the cylinder row on the right side of the vehicle body is indicated by reference numeral 15. Further, in FIG. 2, 16 indicates a piston and 17 indicates a connecting rod.

Further, the engine 1 uses a dry sump type as a lubricating device. Therefore, an oil receiver 18 formed shallower than an oil pan is attached to the lower end of the crankcase 5. . The oil that has flown down to the oil receiver 18 is sucked up by an oil pump (not shown) and returned to an oil supply system having an oil tank.

As shown in FIG. 2, the cylinder body 6 of the engine 1 is formed with a pair of left and right cylinder portions 6a forming a V bank together with the cylinder head 7.
The crankcase 5 is attached to the lower end of the cylinder portion 6a. Further, a compressor 19 for an air conditioner and an alternator 20 are mounted in a dead space formed on the outer side of the cylinder body 6 and the crankcase 5 on the left side of the vehicle body and on both sides of the lower portion of the V bank. . The compressor 19 is provided on the left side of the vehicle body, and the alternator 20 is provided on the right side of the vehicle body. These compressor 19 and alternator 20
Is disposed so as to be located at the rear end of the vehicle body of the engine 1, and is attached to the cylinder body 6 and the crankcase 5 by a bracket (not shown).

Further, as shown in FIG. 3, a transmission case 21 for accommodating transmission means for transmitting the power of the crankshaft 2 to each member described later is provided at an end portion of the engine 1 on the rear side of the vehicle body. Has been. The transmission case 21 includes a cylinder body 6, a crankcase 5, and the oil receiver 1
8, the cylinder head 7, the head cover 8, and a member such as an upper cover 22 (see FIG. 2) bridged between the left and right cylinder rows 14 and 15 and the like on the front wall of the vehicle body. It is formed by attaching the cover body 23 from the rear of the. The mating surface on the front wall of the vehicle body on which the cover body 23 is assembled is designated by reference numeral 2 in FIG.
4 shows. The transmission case 21 is configured so that the oil inside does not leak to the outside by attaching the cover body 23 to the mating surface 24 via a seal member (not shown).

The respective members to which the power of the crankshaft 2 is transmitted by the transmission means provided in the transmission case 21 are the output shaft 12 provided above the crankshaft 2.
A valve drive shaft 25 provided further above the output shaft 12, the compressor 19 and the alternator 20 provided on both sides of the crankshaft 2, an intake cam shaft 26 and an exhaust cam shaft 27 of the cylinder head 7. And so on.

As shown in FIGS. 2 and 3, the output shaft 12 is cranked inside the V bank of the engine 1 and above the crankshaft 2 at a portion sandwiched by the left and right cylinder portions 6a, 6a. It is arranged so that the axis 2 is parallel to the axial direction. The output shaft 12 is formed such that the rear end of the vehicle body has a relatively large outer diameter, and the large diameter portion 12a penetrates the cover body 23 and is projected rearward from the transmission case 21. ing. Output shaft 12
The rear end portion (large diameter portion 12a) is rotatably supported by the cover body 23 by a bearing 28 provided in the penetrating portion.

On the other hand, the shaft portion 12b formed on the front side of the output shaft 12 so as to have a relatively small outer diameter is rotatably supported by the cylinder body 6 via a bearing 29. That is, the output shaft 12 is supported by the bearings 28 and 29 at the rear end of the engine 1 in a so-called double-sided manner.

The bearing 29 supporting the shaft portion 12b is
The lower half is fitted and supported by the cylinder body 6,
The upper half is supported by the cylinder body 6 via the bearing holder 30. The bearing holder 30 has a base 30a having a semicircular cross section for holding the upper half of the bearing 29,
The base 30a is constituted by a supporting arm 30b extending upward from the rear end of the vehicle body.
It is fixed from above by a fixing bolt (not shown). The bearing holder 30 is also formed so as to form a part of the wall of the transmission case 21 on the front side of the vehicle body. Further, this bearing holder 30 is used for the output shaft 12
The base portion 30a for holding the valve drive shaft 25 and the portion (supporting arm 30b) for holding the valve drive shaft 25 can be separately formed. Moreover, both of these separate members can be supported by the cylinder body 6, respectively.

A ring gear 31 for a starter is fixed to a rear end portion of the large-diameter portion 12a of the output shaft 12 which projects to the outside of the transmission case 21, and an input shaft of the transmission indicated by reference numeral 32 in FIG. (Not shown) is connected. The output shaft 12 of the transmission 32 is connected to the axle of the rear wheel 10 via a drive shaft and a differential gear (not shown).

At the end of the large diameter portion 12a on the front side of the vehicle body,
Gear type transmission means 13 for transmitting power from the crankshaft 2 to the output shaft 12 is connected. The gear type transmission means 13 includes a drive gear 34 fixed to a rear end portion of the crankshaft 2 by a fixing bolt 33, and a driven gear 35 axially mounted on the output shaft 12 in a state of meshing with the drive gear 34.
And a damper mechanism 36 and the like provided on the driven gear 35.

The driven gear 35 is formed to have the same number of teeth as the drive gear 34, a damper mechanism 36 is provided on the rear side of the vehicle body, and a chain sprocket 37 is provided on the front side of the vehicle body.
Is provided. The damper mechanism 36 has a coil spring 36a interposed in a power transmission system between the driven gear 35 and the large diameter portion 12a, and includes the crankshaft 2 to the output shaft 1
The vibration in the rotation direction transmitted to the coil spring 36a
Is to be attenuated by.

The valve drive shaft 25 is the engine 1
Is disposed inside the V bank at the center in the left-right direction so that the axial direction is parallel to the crankshaft 2 and the output shaft 12, and the rear end of the vehicle body is the bearing holder 3
No. 0 supporting arm 30b is rotatably supported by a bearing 41, and the front end of the vehicle body is rotatably supported by the cylinder body 6 via a bearing (not shown). Note that the auxiliary end 42 of the valve drive shaft 25 can be connected to another accessory 42, as shown in FIG. This accessory 4
Reference numeral 2 denotes a cooling water pump, which is disposed in the vicinity of the front side of the vehicle body of the bearing 41, and an impeller 43 is fixed to the front end portion of the valve drive shaft 25. 44 shows a pump housing, and 45
Indicates a cooling water inlet pipe.

The bearing 41, which supports the rear end of the valve drive shaft 25, has a lower half fitted and supported by the supporting arm 30b and an upper half held by a bearing cap 51. The bearing cap 51 is fixed to the supporting arm 30b by a fixing bolt (not shown). The rear end of the valve drive shaft 25 is protruded rearward of the vehicle body 3 from the bearing 41 so as to face the inside of the transmission case 21, and the chain sprocket 52 is attached to the protruding portion.
And a valve timing adjusting mechanism 53 are arranged in parallel.
The chain sprocket 52 is connected to the chain sprocket 37 of the driven gear 35 via a chain 54.

Therefore, since power is transmitted to the valve drive shaft 25 from the crankshaft 2 by the drive gear 34, the driven gear 35, the chain 54 and the like, the power is transmitted to the valve drive shaft 25. The rotation of the crankshaft 2 is not changed by the damper mechanism 36. The driven gear 35 of the gear type transmission means 13
The chain 54 and the sprockets 37 and 52 constitute the first transmission means according to the present invention.
As shown in FIG. 3, the chain type transmission means including the chain 54 and the sprockets 37, 54 is positioned on the front side of the vehicle body with respect to the gear type transmission means 13.

The valve timing adjusting mechanism 53 is well known in the art as being mounted on the shaft end portion of the cam shaft, and is the outermost housing 53a.
The rotational phase of is changed with respect to the valve drive shaft 25 by hydraulic pressure. The drive source of the valve timing adjusting mechanism 53 is not limited to hydraulic pressure, and may be an electromagnetic type, for example. The housing 5
3a, a chain sprocket 53b is integrally formed, and a valve operating device 56 of the cylinder head 7 of the cylinder row 14 on the left side of the vehicle body and a cylinder row 1 on the right side of the vehicle body 1 through a timing chain 55 wound around the chain sprocket 53b.
5 is connected to the valve operating device 57 of the cylinder head 7. The chain sprocket 53b is, as shown in FIG. 3, a chain sprocket 53b of the valve drive shaft 25.
The timing chain 55 is located on the rear side of the vehicle body, and therefore, the timing chain 55 is located on the rear side of the vehicle body with respect to the chain 54 extending so as to connect the intermediate shaft 12 and the valve drive shaft 25.

By providing the valve timing adjusting mechanism 53 on the valve drive shaft 25, the phase of both the valve operating device 56 on the left side of the vehicle body and the valve operating device 57 on the right side of the vehicle body can be simultaneously changed by one valve timing adjusting mechanism 53. You can Therefore, the number of valve timing adjusting mechanisms 53 can be reduced as compared with the case where the valve timing adjusting mechanism 53 is provided for each valve operating device (for each cylinder row) like the conventional V-type engine.

In the valve operating devices 56 and 57, two intake valves 58 and two exhaust valves 59 are provided for each cylinder of the intake camshaft 26.
And the exhaust cam shaft 27, so that the intake system is located inside the V bank. Further, both the cam shafts 26 and 27 and the intake / exhaust valve 5
A valve lifter 60 is interposed between the valves 8 and 59. The intake device of the engine 1 is a surge tank T provided so as to be located above the V bank (see FIG. 1).
In this configuration, intake air is guided to an intake port 61 (see FIG. 2) of each cylinder of the cylinder head 7 through an intake manifold (not shown). The fuel is injected from an injector (not shown) into the intake passage or the combustion chamber. On the other hand, the exhaust device is composed of an exhaust manifold (not shown) connected to an exhaust port 62 opening to the outside of the V bank in the cylinder head 7, and a muffler extending from this exhaust manifold to the rear end of the vehicle body. There is.

The intake cam shaft 26 and the exhaust cam shaft 27 are
The rear end of the vehicle body is formed so as to face the inside of the transmission case 21 and is rotatably supported by the cylinder head 7. The rear ends are connected to each other by a chain type transmission means 63. The position of the transmission means 63 in the axial direction is set so as to overlap the chain 54 in FIG. Further, the intake cam shaft 26 is provided with a chain sprocket 64 on the rear side of the vehicle body with respect to the chain type transmission means 63, and is connected to the valve drive shaft 25 via the timing chain 55 wound around the chain sprocket 64. ing.

The timing chain 55 is wound around the valve drive shaft 25 via the intake cam shaft 26 of the cylinder row 14 on the left side of the vehicle body and the intake cam shaft 26 of the cylinder row 15 on the right side of the vehicle body. . In the timing chain 55 according to the present embodiment, the portion between the intake cam shafts 26, 26 is wound around the chain sprocket 53b of the valve timing adjusting mechanism 53 from above, and the intake cam shaft 26 and the valve drive shaft on the left side of the vehicle body. Tension is applied by an idler sprocket 65 provided so as to be located between the two.

The valve drive shaft 25 for transmitting power to the timing chain 55 is arranged at a position as high as possible so that the length of the portion where the timing chain 55 is wound around the chain sprocket 53b becomes as long as possible. Is provided. Therefore, as shown in FIG. 2, the valve drive shaft 25 and the intake cam shaft 26 are arranged at positions where their heights are substantially equal. Thus, the valve drive shaft 2
By increasing the length of the portion around which the timing chain 55 is wound around 5, the timing chain 55 can be reliably hooked on the valve drive shaft 25, and the so-called tooth skipping phenomenon can be prevented. The timing chain 55 and the chain sprocket 53 of the valve drive shaft 25
b and the chain sprocket 64 of the intake camshaft 26
And the chain type transmission means 63 connecting the intake / exhaust cam shafts 26, 27 together constitute a second transmission means according to the present invention.

The compressor 19 and the alternator 2
0 indicates that the rotating shafts 19a and 20a are in the transmission case 21.
The rotary shafts 19a, 20 are formed so as to face the inside.
Power is transmitted from the crankshaft 2 via gear type transmission means 66, 67 connected to a. This gear type transmission means 6
Reference numerals 6 and 67 denote driven gears 68 and 69 provided at the rear ends of the rotary shafts 19a and 20a, and the driven gears 68 and 69.
And intermediate gears 70 and 71 that mesh with both the drive gear 34 of the crankshaft 2. The gears of the gear type transmission means 66, 67 are arranged in the vehicle width direction at the same position in the vertical direction. By configuring the drive system of the auxiliary machine in this way, the heavy objects are arranged in a balanced manner on both sides of the engine 1 in the left-right direction.
It becomes easier to balance the weight of the engine 1 in the left-right direction.
Of the two intermediate gears 70, 71, the intermediate gear 7 of the gear type transmission means 66 for transmitting power to the compressor 19.
No. 0 is integrally provided with a large-diameter gear 70a that meshes with the drive gear 34 of the crankshaft 2 and a small-diameter gear 70b that meshes with the driven gear 68 of the rotary shaft 19a to reduce the rotation of the drive gear 34. It is transmitted to the driven gear 68.

V-type engine 1 constructed as described above
By rotating the crankshaft 2,
Is transmitted to the output shaft 12 through the gear type transmission means 13, and the rotation of the gear is transmitted from the gear type transmission means 13 to the chain 54.
The intake cam shaft 26, which is transmitted to the valve drive shaft 25 via the timing chain 55, rotates with the exhaust cam shaft 27.

Therefore, from the output shaft 12 side to the chain 5
4, the power is transmitted to the valve drive shaft 25, and the intake / exhaust cam shafts 26 and 27 are transmitted from the valve drive shaft 25 via the timing chain 55 and the chain type transmission means 63.
Since the power is transmitted to the valve gear, the valve train member can be provided above the output shaft 12 (on the side opposite to the crankshaft 2), and the valve train member can reduce the axial length of the output shaft 12. No longer regulated. Therefore, the output shaft 12 can be supported in a state where the distance between the one end and the other end of the output shaft 12 is increased, and the output shaft 12 can be firmly supported.

(Second Embodiment) An embodiment of the V-type engine 1 according to the invention described in claim 2 will be described in detail with reference to FIGS. 5 and 6. FIG. 5 is a side view of a V-type engine mounted on the rear part of an automobile, and FIG. 6 is an enlarged sectional view showing both ends of the engine. In these figures,
The same or equivalent members as those described with reference to FIGS. 1 to 4 are designated by the same reference numerals, and detailed description thereof will be appropriately omitted.

A V-type engine 81 shown in FIGS. 5 and 6.
Has a configuration similar to that of the engine 1 shown in FIGS. 1 to 4 except that the configuration of an output shaft to be described later is different, and one end of the vehicle body 3 having the transmission case 21 is located on the vehicle body center side. It is mounted on the rear. That is, the engine 81 according to this embodiment is mounted on the vehicle body 3 in a state in which the front-rear direction is opposite to that shown in the first embodiment,
A transmission means for connecting each shaft of the engine 81, an air conditioner compressor 19, and an alternator 20 to an end portion on the front side of the vehicle body (an end portion on the left side in FIG. 6).
And the transmission 82 is attached to the rear end. This transmission 82
Is configured so that the power of the engine 1 is transmitted from the output shaft 12 projecting from the rear end of the engine 81 and the axle of the rear wheel 10 is driven via a differential gear (not shown).

The output shaft according to this embodiment is shown by reference numeral 83 in FIG. The output shaft 83 is formed so as to penetrate the cylinder body 6 from the front end side (the left side in FIG. 6) to the rear end side, and the front end portion is rotatably attached to the cover body 23 of the transmission case 21 by the bearing 84. It is supported, and its rear end is rotatably supported by the cylinder body 6 by a bearing 85. The output shaft 83 is formed so that the front end portion 83a supported by the cover body 23 has an outer diameter equivalent to that of the shaft portion 83b on the rear side thereof, and the gear type transmission means 1
The pressure receiving plate 86 for connecting to the damper mechanism 36 of No. 3 is integrally formed.

The portion of the rear end of the output shaft 12 supported by the bearing 85 is formed to have a larger outer diameter than the other portion on the front side. The large-diameter portion 83c constitutes the output end of the output shaft 83, and the input shaft (not shown) of the transmission 82 and the starter ring gear 31 are connected to the large-diameter portion 83c.

V-type engine 81 shown in this embodiment
According to this, since the output shaft 83 is supported by the one end portion and the other end portion of the engine 81, the distance between the portions supporting the output shaft 83 (the distance between the bearings 84 and 85) can be maximized. Therefore, the output shaft 83 can be supported more firmly.

[0039]

As described above, according to the present invention, the valve train member can be provided on the opposite side of the output shaft from the crankshaft, and the valve train member allows the axial length of the output shaft to be increased. Is no longer regulated. Therefore, it is possible to support the output shaft in a state where the interval between the parts that support both ends of the output shaft becomes long, and the output shaft can be firmly supported.

By thus increasing the rigidity for supporting the output shaft, it has become possible to manufacture an automobile V-type engine in which the output shaft is located above the crankshaft. The V-type engine for an automobile, in which the output shaft is provided above the crankshaft, can be positioned lower in the engine compartment than the one in which the crankshaft constitutes the output shaft. Therefore, the center of gravity of the vehicle body can be lowered, and the gap between the engine and the bonnet is widened so that the auxiliary machinery can be easily arranged therein.

According to the second aspect of the present invention, since the output shaft can be supported by the one end and the other end of the engine, the interval between the parts supporting the output shaft can be expanded to the maximum, and the output can be increased. The shaft can be supported more firmly.

[Brief description of drawings]

FIG. 1 is a side view of a V-type engine according to the present invention.

FIG. 2 is a rear view showing one end of a V-type engine according to the present invention.

FIG. 3 is an enlarged sectional view showing one end of a V-type engine according to the present invention.

FIG. 4 is a cross-sectional view showing an example in which another accessory is provided on the valve drive shaft.

FIG. 5 is a side view of a V-type engine mounted on a rear portion of an automobile.

FIG. 6 is an enlarged sectional view showing both ends of the engine.

[Explanation of symbols]

1, 81 ... V-type engine, 2 ... Crank shaft, 6 ... Cylinder body, 7 ... Cylinder head, 12, 83 ... Output shaft,
13, 66, 67 ... Gear type transmission means, 21 ... Transmission case, 23 ... Cover body, 25 ... Valve drive shaft, 26 ... Intake cam shaft, 27 ... Exhaust cam shaft, 28, 29, 84, 85
... Bearings, 37, 52, 53b, 64 ... Chain sprockets, 54 ... Chains, 55 ... Timing chains, 5
8 ... Intake valve, 59 ... Exhaust valve, 63 ... Chain type transmission means.

Claims (2)

[Claims] 1. An output shaft is provided inside the V bank and closer to the cylinder head than the crank shaft, in parallel with the crank shaft,
In a V-type engine that transmits the rotation of the crankshaft to this output shaft, the camshaft provided on the cylinder head absorbs
A structure for driving an exhaust valve is provided. A valve drive shaft is rotatably provided on the inner side of the V bank on the opposite side of the crankshaft from the output shaft, and the valve drive shaft is extended from the output shaft side. The power of the crankshaft is transmitted by the first transmission means, and the power is transmitted from the valve drive shaft to the camshaft by the second transmission means, and both ends of the output shaft are rotatably supported by bearings. V-type engine supported. 2. The V-type engine according to claim 1, wherein
A V-type engine in which an output shaft is formed so as to penetrate from one end side to the other end side of a cylinder body, one end portion of this output shaft is connected to a crankshaft, and the other end portion is formed as an output end.