JP2660993B2 - Rejection device for V-type engine - Google Patents

Description

The present invention relates to a V-type engine, and more particularly to a V-type engine having two banks arranged in a V-shape. The present invention relates to a V-type engine cooling device having a water pump disposed at an upper position. 2. Description of the Related Art In a V-type engine having two banks arranged in a V-shape with an output shaft as a center, for example, Japanese Utility Model Laid-Open Publication No.
As shown in JP-A-31-31, a water pump may be provided at one end face of a cylinder block at a position above an output shaft at an intermediate position between the two banks. In this case, the discharge ports of the water pump are provided on both left and right sides of the pump, and communicate with the water jackets of both banks, respectively, and the suction ports of the cylinders of both banks are offset from each other in the output shaft direction. In some cases, a dead space generated at an end of one bank is used, and in this case, an entrance opening is usually provided on the outer surface of the bank. (Problems to be Solved by the Invention) When the inlet opening of the suction port is provided on the outer surface of one bank as described above, the suction port is guided from the lower tank of the radiator connected to the inlet opening. The cooling liquid suction passage is disposed on the side of the cylinder block. A circulation passage through which the pump discharges the coolant discharged from the water jacket during warm-up without passing through the radiator is joined to the suction passage, and a thermostat valve for switching the passage to the junction. Is provided, the circulation passage, the thermostat valve, and the like are also disposed on the side of the cylinder block, so that a large space must be secured on the side of the cylinder block. As a result, the layout of various accessories on the side of the cylinder block is significantly restricted, and the size of the entire engine is increased. Therefore, the present invention provides a V-type engine in which a water pump is disposed at a position above the output shaft on one end side of the V-type engine main body having two banks on one end side in the output axis direction. By improving the arrangement position, a space is provided on the side of the cylinder block, thereby increasing the degree of freedom in laying out various accessories on the side of the cylinder block, and reducing the size of the entire engine. With the goal. (Means for Solving the Problems) That is, a cooling device for a V-type engine according to the present invention is provided with one end in the output shaft direction of a V-type engine body having two banks arranged in a V-shape with the output shaft as a center. A water pump is provided at a position above the output shaft on the side end surface, and a discharge port for supplying engine coolant to the water jackets of the banks from the water pump is provided. The suction port into which the coolant is introduced from
The water pump is formed in the main body of the V-type engine so as to be guided to the pump chamber of the water pump from an opening on the upper surface between the two banks. (Operation) According to the above configuration, the inlet opening of the suction port is provided on the upper surface between both banks. Therefore,
A cooling liquid suction passage guided from the lower tank of the radiator and connected to the inlet opening, a cooling passage discharged from the water jacket to the water pump without passing through the radiator, and a circulation passage A thermostat valve or the like provided at a junction of the passage with the suction passage can be disposed above an intermediate portion between the two banks. As a result, there is more space on the side of the cylinder block than in the case of disposing them on the side of the cylinder block. (Examples) Hereinafter, examples of the present invention will be described. Engine according to the present embodiment, as shown in FIG. 1, the center and the cylinder block 1, the two cylinder head 2 _1, 2 _2, which is disposed parallel to the upper surface sides, the bearing portion 1a of the crankshaft first forming a V-type, the second bank 3 _1, 3 ₂ has, both banks 3 _1, 3 _2, respectively a plurality of cylinders 4 ... 4 (see FIG. 3) are provided in a row as. A water pump mounting portion 5 is provided on the front end surface of the cylinder block 1 above the bearing portion 1a, and a water pump 6 is mounted on the mounting portion 5 as shown in FIG. . The water pump 6 includes a pump housing 7 fixed to the mounting portion 5 on the front end surface of the cylinder block, a drive shaft 8 rotatably supported by a cylindrical portion 7a of the housing 7, and one end of the shaft 8. It comprises an impeller 10 which is fixed and disposed in a pump chamber 9 formed between the housing 7 and the end face of the cylinder block 1. A belt 12 for transmitting the rotation of a crankshaft (not shown) is wound around a pulley 11 attached to the other end of the drive shaft 8, and the drive shaft 8 or the impeller 10 is rotated by the rotation of the crankshaft. It is designed to be driven to rotate. On the other hand, as shown in FIG. 1, the pump chamber 9 located at the center of the pump mounting portion 5 has a circular concave portion 9a facing the impeller 10, and bulges upward in a spiral around the concave portion 9a. An upper bulging portion 9b and a lower bulging portion 9c which similarly bulges downward around the concave portion 9a in a spiral shape. These bulging portions 9b and 9c are substantially tangential to the first and second bulging portions, respectively. Discharge port 1
3 ₁ and 13 ₂ are continuous. The first discharge port 13 ₁ is right continuous above the bulging portion 9b, extend obliquely downwards, from the outlet opening 14 ₁ of the front end first bank 3 ₁ of water jacket (not shown) through, also the second discharge port 13 ₂ is left to be continuous with the bulge portion 9c of the lower, extends obliquely upward from the outlet opening 14 ₂ of the front end of the second bank 3 ₂ water jacket (not shown) Leads to. Also, as shown in FIGS. 1 and 2, the cylinder block 1
The suction port 15 of the pump 6 is provided at the front end of the pump 6. The suction port 15, which has an inlet opening 16 on the upper surface between the two banks 3 _1, 3 ₂ in the cylinder block 1, and a vertical portion 15a extending laterally just below the opening 16, the from the vertical portion 15a A horizontal portion 15b that is bent in the horizontal direction toward the front end face of the cylinder block where the pump mounting portion 5 is provided, and the horizontal portion 15b extends in the axial direction of the impeller 10 so that the axial center portion of the impeller 10 That is, the pump chamber 9 is opened at the center of the circular concave portion 9a. Then, as shown in the first to third drawing, sandwiched in the middle portion upwardly, i.e. both the banks 3 _1, 3 ₂ of the cylinder head 2 _1, 2 ₂ between both banks 3 _1, 3 ₂ in the cylinder block 1 In the valley-shaped space X, a cooling liquid suction pipe 17 is disposed in the horizontal direction in the axial direction over substantially the entire length of the cylinder block 1, and the front end thereof is connected to the inlet opening of the suction port 15 through a bent pipe 18. A thermostat valve 19 is connected to the rear end of the suction pipe 17, and a hose 21 guided from a lower tank of a radiator 20 to a pipe joint 19 a fixed to the thermostat valve 19. Are connected (see FIG. 3). Further, the both banks 3 _1, 3 ₂ of the cylinder head 2 _1, 2 ₂ of the front end, the cooling fluid discharge port 22 ₁ which opens upwardly protrudes in the valley-like space X As is clear in Figure 1 , 22 ₂ respectively provided, the branch portion 23 ₁ of the outlet 22 _1, 22 ₂ coolant discharge pipe 23 the rear is bifurcated shape, 23 ₂ are respectively connected. A hose 24 reaching the upper tank of the radiator 20 is connected to an outlet 23a at the front end of the discharge pipe 23 (see FIG. 3). Further, between the branch section 23 _1, 23 ₂ in the cooling liquid discharge pipe 23 coolant circulation outlet 23b are provided, the front end portion of the cooling liquid circulation pipe 25 is connected to the outlet 23 _3. The circulation pipe 25 is disposed in the trough-shaped space X between the cylinder head 2 _1, 2 _2, extends rearward along the suction pipe 17 is disposed in the rear end portion of the cylinder block 1 The thermostat valve 19 is connected. Here, when the temperature of the coolant is high, the thermostat valve 19 is connected to the radiator.
The hose 21 led from the lower tank 20 communicates with the suction pipe 17, and when the temperature of the coolant is low, the pipe for circulation is used.
25 is communicated with the suction pipe 17. In addition to the above configuration, in this embodiment,
As shown in the figure, the uppermost position of the upper bulging portion 9b of the pump chamber 9 in the pump mounting portion 5 of the cylinder block 1 is perpendicular to the suction port 15 overlapping with the bulging portion 9b when viewed in the axial direction of the impeller 10. A through hole 26 for communicating with the portion 15a is provided, and an air bleeding hose is provided between the upper end of the bent pipe 18 connected to the inlet opening 16 of the suction port 15 and the coolant discharge pipe 23. 27 is connected. The engine according to this embodiment, so-called compact intake system 30 is employed at the air intake device for supplying intake air to both the banks 3 _1, 3 ₂ of each cylinder 4 ... 4. This intake device
The schematic configuration of the cylinder 30 will be described with reference to FIGS. 4 and 5. In the intake device 30, the cylinder heads 2 ₁ and 2 _{2 of} both banks 3 ₁ and 3 ₂ are provided.
Within, along the direction of the row of cylinders with respective intake common passage 31 which is provided, the intake branches are branched from these passages 31 and 31 respectively communicating with the bank 3 _1, 3 ₂ of each cylinder 4 ... 4 32 are provided and the common passage 3 is provided.
In the vicinity of the front end of each of the first and third air inlets 33, 33, there are provided intake openings 33, 33 which open upward, and the rear ends of the common passages 31, 31 are open to the rear end of the cylinder head. Then, at the downstream end of the main intake pipe 34 led from an air cleaner (not shown),
The upstream end of a branch intake pipe 37 having a bifurcated front portion is connected via a throttle body 36 having twin throttle valves 35, 35 therein, and two branch portions of the branch intake pipe 37 are provided. The downstream end of 38, 38 is the cylinder head 2 ₁ ,
They are respectively connected to the intake-air inlet 33, 33 provided in the vicinity of the front end portion of the intake common passage 31 in the 2 _2. Further, between the rear end openings 39, 39 of the intake common passages 31, 31, through a valve body 41 accommodating the on-off valves 40, 40, a first communication pipe 42 having a small diameter of a flat U-shape is provided. A large-diameter second communication pipe 43 is connected to the on-off valves 40 and 40 in accordance with the engine speed.
And an actuator 44 for operating the. As shown in FIG. 6, the on-off valves 40, 40 close the rear end openings 39, 39 of the intake common passages 31, 31 in a low engine speed range, and open both intake ports in a middle speed range. The common passages 31, 31 are communicated only by the small-diameter first communication tube 42, and the state is switched to a state in which the intake common passages 31, 31 are communicated by both the first and second communication tubes 42, 43 at high rotation. It has become. In other words, by changing the natural frequency of the intake passage in accordance with the engine speed, the intake resonance effect can be effectively used in a wide engine speed range to improve the intake charging efficiency or the engine output performance. It is. In particular, according to the compact intake device 30, the intake common passages 31, 31 as the resonance section and the intake branch passages 32, 32 between the passages 31, 31, and the cylinders 4,. 2 _1, 2 so provided in _2, both the cylinder head 2
_1, 2 spare space in the valley-shaped space X between the _two occurs, the coolant intake pipe as a characteristic portion of the merits by utilizing this space 17
And a circulation pipe 25 are provided. According to the above configuration, when the impeller 10 of the water pump 6 is driven to rotate via the belt 12, the pulley 11, and the drive shaft 8 shown in FIG. Of the cooling fluid is inhaled,
The coolant flows into the suction port 15 through the hose 21, the thermostat valve 19, the coolant suction pipe 17 and the bent pipe 18, and is introduced into the pump chamber 9 of the pump 6 from the suction port 15, and The cooling liquid is the impeller 10
First from the upper and lower bulging portion 9b, 9c of the pump chamber 9 by the rotation of the second discharged to the discharge port 13 _1, 13 _2, these ports 13 _1, 13 ₂ of the outlet openings 14 _1, 14 ₂ From the first and second banks
3 _1, 3 are respectively supplied to the ₂ of the water jacket. Then, after cooling the engine each part, coolant temperature has become high through the discharge pipe 23 and hose 24 from the cylinder head 2 _1, 2 ₂ of the front end coolant discharge port provided in the section 22 _1, 22 ₂ It is returned to the upper tank of the radiator 20, cooled to a low temperature by the radiator 20, and then supplied again to each part of the engine by the pump 6 as described above. During warm-up, the thermostat valve 19 is connected to the circulation pipe 25.
Is communicated with the suction pipe 17, so that the coolant discharged from the discharge ports 22 ₁ and 22 ₂ into the discharge pipe 23 flows into the circulation pipe 2.
5. Immediately sucked into the pump 6 through the suction pipe 17 and the suction port 15, without being returned to the radiator 20,
It will circulate through the water jacket inside the engine. In this embodiment, the downstream portion of the suction port 15 has a horizontal portion 15b facing the axis of the impeller 10.
As a result, the coolant flows into the pump chamber 9 in a uniform distribution in the circumferential direction, and accordingly, the discharge amount to the _first and second discharge ports 13 ₁ and 13 ₂ or the first and second discharge ports 2 banks 3 ₁ , 3 ₂
The supply amount of the cooling liquid to the water jacket becomes uniform. Further, a through hole 26 is provided between the uppermost position of the upper bulging portion 9b in the pump chamber 9 and the suction port 15,
An air release hose is provided between the bent pipe 18 connected to the inlet opening 16 at the upper end of the suction port and the discharge pipe 23.
27 is connected, the air in the pump chamber 9 is discharged to the radiator 20 side through the through hole 26, the suction port 15, the bent pipe 18, the hose 27 and the discharge pipe 23, Inconveniences such as cavitation due to accumulation of air in the interior 9 are prevented. In particular, according to the configuration described above, the suction port 15 is guided from above to the pump 6 disposed above the bearing 1a of the crankshaft on the front end surface of the cylinder block 1, and the suction port 15 is Inlet opening 16
There along with that provided on the upper surface between the two banks 3 _1, 3 _2, suction pipe 17 connected to the opening 16 both banks
3 ₁ is disposed in the 3 ₂ of the cylinder head 2 _1, 2 trough space X generated between ₂ and connected to a thermostat valve 19 and the thermostatic valve 19 which rear end is connected to intake pipe 17 The circulation pipe 25 and the like are also arranged in the valley-shaped space X. That is, the intake of the cooling fluid, discharging, circulation and the like are to be made by both the banks 3 _1, 3 ₂ of the trough-shaped space of the intermediate portion X. Therefore, it is not necessary to secure a large space on the side of the cylinder block 1 as in the case where the components constituting the cooling system such as the suction pipe 17 are disposed on the side of the cylinder block. (Effects of the Invention) As described above, according to the present invention, V
A water pump is provided at a position above the output shaft on an end surface of the V-type engine body having two banks arranged in a mold at one end side in the output shaft direction, and the water pump is connected to the water jackets of both banks. In a V-type engine provided with a discharge port for supplying engine coolant, a suction port through which coolant is introduced from a radiator of the water pump is led to a pump chamber of the water pump through an opening on the upper surface between the banks. As described above, since it is formed in the V-type engine main body, a suction passage for the coolant guided from the radiator, a circulation passage for the coolant, and the like are disposed above the intermediate portion between the two banks. Therefore, it is not necessary to secure a large space for disposing these on the side portions. As a result, the degree of freedom in laying out various accessories on the side of the cylinder block is increased, so that they can be arranged at optimal positions, and the entire engine can be made compact.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the present invention. FIG. 1 is a front view of a cooling device according to this embodiment, FIG. 2 is a side view thereof, and FIG. is there. FIG. 4 is a plan view showing an intake device of the engine to which the present embodiment is applied, FIG. 5 is a side view of the essential part, and FIG. 6 is an opening / closing characteristic diagram of an on-off valve in the intake device. 1 ... V-type engine body (cylinder block), 3 ₁ , 3 ₂
… Bank, 6… Water pump, 9… Pump chamber, 13 ₁ , 13 ₂ … Discharge port, 15… Suction port, 16… Opening (inlet opening), 20… Radiator.

Claims (1)

(57) [Claims] A water pump is provided at a position above the output shaft on an end face of the V-type engine body having two banks arranged in a V-shape with the output shaft as a center, and the water pump is disposed at a position above the output shaft. A cooling device for a V-type engine provided with a discharge port for supplying an engine coolant to water jackets of both banks,
As the suction port of the water pump is guided from the opening on the upper surface between the two banks to the pump chamber into which the coolant is introduced from the radiator of the water pump,
A cooling device for a V-type engine, which is formed in the V-type engine body.