JP3130088B2 - V-type engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a V-type engine.

[0002]

2. Description of the Related Art It is known that a V-type engine is compact in size by arranging auxiliary machines between two banks. For example, Japanese Utility Model Laid-Open No. 62-69034 discloses a structure in which auxiliary machines are arranged in a space between banks of a V-type engine.

[0003]

In a layout of a vehicle having a V-type engine, a radiator is usually arranged on the front side of the engine. In addition, the water pump is designed to supply cooling water evenly to the water jackets of the cylinders of both banks.
It is located on the axis of symmetry of the mold engine. The cooling water pipe from the radiator once extends from the front side to the rear side of the engine, further extends downward, reverses, extends forward, and is connected to the water pump. However, when the auxiliary equipment is arranged between the banks as described above, it is difficult to avoid interference between the auxiliary equipment and the cooling water system, and a compact engine layout cannot be achieved.

The present invention has been made in view of the above circumstances, and provides a compact V-type engine without lowering the cooling performance of a cooling device and by arranging auxiliary equipment between banks to effectively use space. Aim.

[0005]

To solve the above-mentioned problems, the present invention is configured as follows. A V-type engine according to the present invention includes an auxiliary machine disposed at a position offset from a left-right symmetry axis of a V-shaped engine in a V-shaped space formed between two banks, and a lower side of the auxiliary machine. And a cooling water intake portion provided at a position offset to a side opposite to a position where the accessory is arranged with respect to the left-right symmetric axis.

In a preferred aspect, the cooling water intake section is provided on the engine front side at one end in the cylinder direction, a water pump is provided below the space on the engine front side, and a water pump is provided between the cooling water intake section and the bank. , A cooling water passage extending once to the other end side in the cylinder row direction and inverted and connected to the water pump is formed. Preferably, a belt or a chain that extends over a drive pulley or a gear of the accessory is arranged on the engine front side, and the belt or the chain is another accessory that is arranged on the opposite side of the accessory with respect to the target axis. And the cooling water intake section is disposed below a belt or a chain between the auxiliary machines. The auxiliary machine is a mechanical supercharger driven by engine power, and an outlet pipe provided at a side of the supercharger for discharging supercharged air is disposed in the space.

[0007]

According to the above construction of the present invention, the cooling water is introduced into the cooling water intake section provided between the radiator and the V-bank, and once flows in the cylinder arrangement direction, reverses and is introduced axially into the water pump. Introduced into the engine itself,
Provides a cooling effect. Thereafter, it is collected from the engine main body through the merging passage and returned to the radiator. In this configuration, similarly to the auxiliary devices arranged between the V banks, the cooling water intake portions provided below this space portion are arranged on both sides with respect to the axis of symmetry, so that the space of the V bank can be used effectively, The layout of the system is easy. Furthermore, in order to transmit the engine power to the accessory, it is necessary to wrap a belt or churn around the pulley or gear of the accessory, but this belt or chain is arranged on the opposite side of the axis of symmetry with respect to the accessory. By bridging the belt or chain of another accessory, it is easy to make the bridging angle of the belt or chain sharp, and a favorable operation state can be obtained. In addition, the lower side of the belt or chain can be obtained. By expanding the space, the cooling water intake portion can be easily laid out on the opposite side of the auxiliary machine with respect to the target axis. When the auxiliary machine is a mechanical supercharger, the inlet pipe and the outlet pipe of the supercharger also need to be arranged between the V banks. However, if the turbocharger is arranged offset from the symmetry axis, the opposite will occur. The surrounding space can be provided by utilizing the space on the side.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. The engine according to one embodiment of the present invention is a V-6 engine. In this structure, a cylinder head is attached to each bank. Figure 1 shows the engine 1
It is an elevational view of the front side of FIG. FIG. 2 is an elevation view showing a mechanism inside a front case of the engine 1. FIG.
Is a partial plan view of the cylinder block 2b. Referring to FIG. 1, the front side of the engine body 2 is covered by a front case, and a space surrounded by the end surface of the engine body and the front case accommodates a chain mechanism for driving a valve operating mechanism. The front case includes three cylinder head front cases 3 attached to the front surface of the cylinder head 2a of each bank and a cylinder block front case 4 attached to the front surface of the cylinder block.

The cylinder head front case 3 is provided with protrusions 3a and 3b for accommodating drive mechanisms for the intake camshaft 5 and the exhaust camshaft 6, respectively. Also,
Each of the front cases 3 and 4 is attached to the front end face of the engine body 2 by bolts 7 around its periphery. A crankshaft 8 of the engine extends through the cylinder block front case 4 and has a front end to which a pulley 9 for transmitting a driving force to an auxiliary machine is attached. An oil pan 10 is attached to a lower portion of the cylinder block 2b. An oil filter 11 is provided beside the oil pan 10. Inside the oil pan 10 is a suction pipe 12 of an oil pump.
Is immersed below the liquid level.

An alternator 15 is attached to one side of the engine 1 via brackets 13 and 14. A drive pulley 16 is mounted on the front side of the alternator 15. Alternator 15
On the side of the engine 1 opposite to the side where the
An air conditioner driving pulley 17 is arranged. Further, between the banks, a mechanical supercharger 18 is provided at a position slightly offset from the symmetry axis L of the engine toward one bank. At the side of the supercharger 16, there is a supercharged outlet pipe 1.
9 are arranged adjacent to each other.

Further, between the two cylinder heads 2a,
A cooling water outlet from the cylinder head 2a is connected to a merging passage 20 for merging cooling water from a water jacket of the cylinder head 2a and returning the cooling water to a radiator (not shown). The merging passage 20 crosses the front side of the cylinder head front case 3 in an arch shape. One end of the merging passage 20 has a merging passage 20
A cooling water outlet pipe 21 for returning cooling water from the heater to a radiator (not shown) is connected, and a cooling water return pipe 22 from the heater is connected.

A water pump 23 having a center on the axis of symmetry L is provided in a valley portion of the bank below the merging passage 20, and a water pump 23 is provided between the merging passage 20 and the front end face of the engine body. Cooling water intake pipe 2
4 is located. This pipe 24 is connected to the supercharger 1 with respect to the axis of symmetry L.
8 is offset to the side opposite to the side on which it is arranged. This pipe 24 has a cooling water pipe 2 to a heater (not shown).
5 is connected.

A belt 26 for driving the turbocharger extends from the crank pulley 9 to a pulley (not shown) which is coaxial with the pulley 17 for driving the air conditioner.
Has been passed over. An idler pulley 41 is provided between the crank pulley 9 and the turbocharger driving pulley 18a to adjust the tension of the belt 26. In this case, since the turbocharger driving pulley 18a and the air conditioner driving pulley 17 are located on the opposite sides with respect to the symmetry axis L, interference with other accessories is avoided, and the belt 26 is bridged. The angle can be made acute and power transmission can be performed efficiently.

The pulley 17 for driving the air conditioner is connected to the crank pulley 9 by a belt 27, and an idler pulley 28 is provided between the two to adjust the belt tension. The alternator 15 and the pulley 29 are driven via a belt 30 by a driving pulley (not shown) provided coaxially with the air conditioner driving pulley 17. In this case, the tension is adjusted by the idler pulley 31.

Referring to FIG. 2, the water pump 23 is chained around a drive gear 32 of the crankshaft 8 and a drive gear 33 of the intake camshaft 5.
The rotational force of the crankshaft 8 is transmitted through the chain 34. The oil pump driving gear 35 is connected to the crankshaft 8.
And is driven through a chain 36 by another drive gear on the crankshaft 8.

A gear 37 is attached to the exhaust camshaft 6, and is driven by a chain 38 hung on another gear of the intake camshaft 5. Further, a cooling water pipe to the water pump 23 is located at a position offset to the bank opposite to the side where the supercharger 18 is offset in the interbank space and near the valley of the bank. A cooling water intake portion 39 to which the cooling water 24 is connected is provided integrally with the cylinder block 2b. As shown in FIG. 3, the passage 40 from the cooling water intake portion 39 once extends in the cylinder arrangement direction and then reverses to communicate with the water pump 23 so as to introduce cooling water toward the axis.

According to this configuration, the cooling water of the radiator is supplied to the cylinder block 2b through the cooling water intake pipe 24.
Is introduced into the cylinder block 2b from the cooling water intake section 39 provided in the cylinder block 2b, flows toward the rear side in the cylinder arrangement direction, reverses in the middle, and extends in the axial direction along the rotation axis of the water pump 23 toward the engine front side. Water pump 23
Will be introduced. The water pump 23 discharges the cooling water in the radial direction. However, since the water is provided on the axis of symmetry L of the engine, the discharged cooling water is uniformly supplied to the cooling systems of the left and right banks.

The cooling water from the water pump 23 introduced into the cylinder block 2b circulates through the cylinder block 2b and the cylinder head 2a, and flows through a cooling water outlet provided at the front side of the two cylinder heads 2a. Each flows into the merging passage 20, and then returns to the radiator.

[0019]

According to the present invention, the cooling water is introduced into the cooling water intake section provided between the radiator and the V-bank, is once flowed in the cylinder arrangement direction, is inverted and is axially introduced into the water pump, and is provided with the engine body. To provide a cooling effect. Thereafter, it is collected from the engine main body through the merging passage and returned to the radiator. In this configuration, similarly to the auxiliary devices arranged between the V banks, the cooling water intake portions provided below this space portion are arranged on both sides with respect to the axis of symmetry, so that the space of the V bank can be used effectively, The layout of the system is easy. Furthermore, in order to transmit the engine power to the accessory, it is necessary to wrap a belt or churn around the pulley or gear of the accessory, but this belt or chain is arranged on the opposite side of the axis of symmetry with respect to the accessory. By bridging the belt or chain of another accessory, it is easy to make the bridging angle of the belt or chain sharp, and a favorable operation state can be obtained. In addition, the lower side of the belt or chain can be obtained. By expanding the space, the cooling water intake portion can be easily laid out on the opposite side of the auxiliary machine with respect to the target axis. When the auxiliary machine is a mechanical supercharger, the inlet pipe and the outlet pipe of the supercharger also need to be arranged between the V banks. However, if the turbocharger is arranged offset from the symmetry axis, the opposite will occur. The surrounding space can be provided by utilizing the space on the side.

[Brief description of the drawings]

FIG. 1 is an elevational view of an engine front side according to an embodiment of the present invention;

FIG. 2 is an elevation view showing an internal mechanism of a front case of the engine;

FIG. 3 is a partial plan view of a cylinder block.

[Explanation of symbols]

 Reference Signs List 1 engine 2 engine body 3 cylinder head front case 4 cylinder block front case 5 intake camshaft 6 exhaust camshaft 8 crankshaft 9 crank pulley 10 oil pan 11 oil filter 13 bracket 14 bracket 15 alternator 16 pulley 18 turbocharger 19 turbocharger Machine outlet pipe 20 Confluence passage 39 Cooling water intake.

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁷ Identification code FI F02B 75/22 F02B 75/22 EF (72) Inventor Kenji Kashiyama 3-1, Fuchu-cho Shinchi, Aki-gun, Hiroshima Mazda Co., Ltd. (72) Inventor Tatsuya Uesugi 3-1 Shinchi, Fuchu-cho, Aki-gun, Hiroshima Prefecture Inside Mazda Corporation (72) Inventor Yasushi Matsubara 3-1 Shinchi, Fuchu-cho, Aki County, Hiroshima Prefecture Inside Mazda Corporation (72) Inventor Noriyuki Iwata 3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima Prefecture Mazda Co., Ltd. (56) References JP-A-57-135227 (JP, A) JP-A-1-262326 (JP, A) JP-A Heisei 2-211329 (JP, A) Japanese Utility Model Showa 59-35642 (JP, U) Japanese Utility Model Showa 62-69034 (JP, U) Japanese Utility Model Utility Model 5-24933 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) F02B 67/00 F01P 3/02 F01P 5/10 F02B 39 / 04 F02B 75/22

Claims (4)

(57) [Claims] 1. A belt or a chain for driving an auxiliary machine is arranged on an engine front side at one end side in a cylinder row direction,
In the V-shaped space formed between the two banks, one arrangement accessory driven by the belt or the chain is arranged at a position offset from the left-right symmetry axis of the V-type engine, and the engine front In the V-shaped space on the side, a cooling water intake portion is disposed at a position below the auxiliary device and offset to a side opposite to a position where the auxiliary device is disposed with respect to the left-right symmetric axis. V-type engine. 2. A water pump is provided below the space on the engine front side, and extends once from the cooling water intake section to the other end in the cylinder row direction between the banks and is connected to the water pump. The V-type engine according to claim 1, wherein a cooling water passage is provided. 3. A belt or a chain disposed on the engine front side for driving an auxiliary device disposed in the V-shaped space portion is provided outside a V-shaped space portion on a side opposite to the auxiliary device with respect to the target shaft. The cooling water intake section is also arranged around a drive pulley or a gear of another auxiliary machine arranged, and the cooling water intake section is arranged below a belt or a chain between the two auxiliary machines. The V-type engine according to claim 2. 4. A mechanical supercharger in which the auxiliary machine is driven by engine power, wherein an outlet pipe provided at a side of the supercharger for discharging supercharged air is provided with cooling water in the space. The V-type engine according to any one of claims 1 to 3, wherein the V-type engine is disposed above the intake portion.