JPH02259227A - Cooling device for horizontal engine - Google Patents

Abstract

PURPOSE:To decrease a differential heat radiating amount to cooling water between cylinders by providing a cross flow type radiator while arranging a main cooling fan and a cooling water introducing port position to the radiator out of the main and subcooling fans, to a transmission side. CONSTITUTION:In a horizontal six-cylinder V-engine CE, cooling water, delivered from a water pump 6, is circulated in each jacket of the first and second banks cooling the engine CE, and the cooling water, increasing its temperature by cooling, is guided through a return passage 7 to a cross flow type radiator 8 provided with tanks 21, 24 in right and left, being cooled. This radiator 8 respectively arranges a main cooling fan 27 in a side of the tank 21 forming a cooling water introducing port 22 while a subcooling fan 28 in a side of the tank 24 forming a cooling water discharge port 29. The main cooling fan 27 is arranged so as to position at least one part of its circular rotating locus on the side of a transmission 5 from the mating surface between the engine CE and the transmission 5.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an improvement in an engine cooling system including a radiator, a cooling fan, and a cooling water path in a horizontally mounted power unit.

(Prior art) In vehicles where a power unit consisting of an engine and a transmission (hereinafter referred to as "transmission") is mounted horizontally so that the axial direction of the crankshaft is in the left-right direction (axle direction) of the vehicle, the power unit is mounted vertically. It is possible to lower the bonnet by lowering one end of the engine room in the longitudinal direction of the vehicle, and in order to accommodate this lower bonnet, a cross-flow type radiator with tanks on both the left and right sides has been adopted. It is being done.

On the other hand, in the above-mentioned cross-flow type radiator, as disclosed in, for example, Japanese Utility Model Application No. 81-182530, the cooling water inlet and outlet for the radiator are located in the left and right tanks, which reduces the cooling efficiency. The main cooling fan is placed on the tank side that forms the cooling water inlet to the radiator, and the sub-cooling fan that rotates when the air conditioner is activated (cools the air conditioner's condenser, etc.) is placed on the tank side that forms the cooling water outlet. A structure in which fans are arranged is known.

Therefore, when adopting a cross-flow type radiator equipped with such dual cooling fans in a vehicle with a horizontally mounted power unit, it is necessary to take advantage of the features of the horizontally mounted power unit (as viewed from the front and rear of the vehicle). , the main cooling fan is placed on the transmission side of the engine room where there is a lot of air passing through (that is, on the transmission side where there is a lot of clearance between the bonnet and the power unit when viewed from the front and back of the vehicle) to increase the heat dissipation effect of the radiator. is possible.

(Problem to be solved by the invention) However, when adopting a radiator unit in which the main cooling fan is placed on the transmission side, depending on the layout of the cooling path including the engine water jacket, the temperature of the cooling water between the cylinders may vary. There is a problem in which variations in combustion performance arise due to the disparity in fuel consumption.

In other words, based on the general wisdom of reducing passage resistance and making the cooling water passage more compact, the inlet and outlet of the water jacket are placed close to the radiator's cooling water outlet and cooling water inlet, respectively. When setting (
In a combination of a horizontal power unit and a cross-flow type radiator, when the water jacket outlet is placed on the mission side and the water jacket inlet is placed on the side opposite to the mission point), the relatively low temperature that passes through the radiator with high heat dissipation capacity of cooling water flows into the cylinder at the upstream end, while sufficiently heated cooling water is led to the cylinder at the downstream end, so there is a difference in the amount of heat dissipated to the water jacket between the cylinders. This causes a problem in that variations in combustion performance between cylinders become apparent.

The present invention has been made in view of the above-mentioned problems, and includes:
A cross-flow type radiator is used in the horizontal power unit, and a cooling fan with high heat dissipation capacity is installed.
An object of the present invention is to provide a cooling device for a horizontal engine that can eliminate differences in heat radiation amount between cylinders.

(Means for Solving the Problem) In order to achieve the above-mentioned object, a cooling device for a horizontal engine according to the present invention has a cross-flow type radiator arranged substantially parallel to the axis of the crankshaft, and tanks provided on both sides. Among them, the tank forming the cooling water inlet to the radiator is placed on the transmission side, and the main cooling fan is placed on the tank side forming the cooling water inlet, so that at least the rotation locus of the circular rod of the main cooling fan is The main cooling fan is placed so that a part of it is placed on the mission side from the mating surface of the engine and the transmission, and a water pump and the engine's water pump, which communicates with the water pump's discharge port, are placed on the opposite side of the engine. A jacket inlet and an outlet of this water jacket are provided respectively, and the water jacket is configured in a town flow type in which the main flow of cooling water flows down to the opposite side of Mitsushiron via the end cylinder on the transmission side. A configuration in which a suction passage communicates with the cooling water inlet formed in the side tank, and a cooling water return passage communicates with the water pump inlet and the cooling water discharge port formed in the anti-transmission side tank. It is said that

(Function) In the cooling system for a horizontal engine configured as described above, the amount of cooling air passing through the radiator core is sufficiently increased at the cooling water inlet portion where the cooling water temperature is highest, and the temperature of the cooling water and cooling air is increased. While the heat dissipation capacity of the radiator is sufficiently increased by both increasing the difference and increasing air volume, the main flow of the cooling water in the water jacket is configured to allow town flow, making the amount of heat dissipated to the cooling water for each cylinder almost uniform. .

(Effects of the Invention) As described above, a cross-flow type radiator is provided to reduce the bonnet of the vehicle, and the radiator heat dissipation capacity is increased by locating the main cooling fan and the cooling water inlet to the radiator on the transmission side. It is possible to achieve both cooling performance, fuel efficiency, and output performance by reducing the difference in the amount of heat released to the cooling water between cylinders and reducing the variation in combustion performance between cylinders while sufficiently increasing the combustion performance.

(Example) Examples of the present invention will be specifically described below.

As shown in FIGS. 1 to 3, the horizontally mounted 6-cylinder V-type engine CE has a first cylinder head 1p and a first cylinder pro-lock portion 2p of the cylinder block 2. A bank P and a second bank Q constituted by a second cylinder head 1q and a second cylinder block portion 2q of the cylinder block 2 are provided, and both banks P and Q are longitudinally arranged in the axial direction of the crankshaft 3. A V-shaped space 4 is defined between both banks P and Q. The first bank P has the engine front side (
1st, 3rd, and 5th cylinders #1, #3, and #5 are arranged in order from the end F side (on the opposite Mitsushiron side), while the second, second, and fifth cylinders are arranged in order from the engine front end F side in the second bank Q. 4th, 6th
Cylinders #2, #4, and #6 are arranged. Engine CE
The second bank Q is located on the front side when viewed in the longitudinal direction of the vehicle, and the crankshaft 3 is disposed horizontally so as to face the left-right direction (vehicle width direction) of the vehicle. That is, the front end F of the engine CE faces the right side of the vehicle (the left side in Figure 1), and the rear (Mitsushiron side) end R faces the left side of the vehicle (the right side in Figure 1). ing. Note that a missillon 5 is provided at the rear end R of the engine CE.

A cooling device R8 is provided to cool the engine CE, and this cooling device R8 sequentially cools the cooling water discharged from the water pump 6 into the jackets of the first and second cylinder block portions 2p and 2q and the first cylinder block portions 2p and 2q. , 2nd Sinridahedi
The engine GE is cooled by circulating jets of p and lq, and the coolant warmed by this is introduced into a cross-flow type radiator 8 through a coolant return passage 7 and cooled. The basic configuration is such that cooling water is returned to the water pump 6 through a suction passage 9. When the cooling water temperature is low, in order to prevent overcooling of the engine GE, a thermostat 11 installed in the suction passage 9 directs the cooling water in the cooling water return passage 7 through the bypass passage 12 that bypasses the radiator 8. It is designed to be returned to the suction passage 9.

Each member constituting the cooling device R8 will be described below with reference to FIG. 4, which shows the flow direction of the cooling water. In addition, in FIG. 4, solid line arrows indicate the flow in the warm state, and broken line arrows indicate the flow in the cold state.

A water pump 6, which is rotatably driven by a crankshaft 3 via a belt (not shown), is attached to the front end F of the cylinder block 2 by a crank at an intermediate position between both banks P and Q when viewed in the width direction of the engine CE. It is located slightly above the shaft 3. Cooling water inlets 14p and 14q for these jackets are provided at the front end F of the first and second cylinder block parts 2p12q, respectively. It communicates with the discharge port of the water pump 6 via two cooling water supply passages 16p and 18q. On the other hand, in the vicinity of the front end F, the first and second cylinder heads ip,
Cooling water outlet ports 17p and 17Q of these jetkets are respectively connected to a cooling water return passage 7 arranged in a V-shaped space 4 on the inner side surface of tq. Here, the main flow of cooling water discharged from the water pump 6 flows from the front side of the engine CE to the first and second cylinder blocks 2.
p, 2q, flows through the jacket from the front side to the rear side, and flows into the first jacket near the rear end R.
, second cylinder head 1m), Q, and flows inside from the rear side to the front side, and the engine CE
A so-called turn-flow type water jacket W flowing out from the front side is configured. In this way, the first
, the direction of flow of cooling water is opposite between the second cylinder block portion 2, 2q and the first and second cylinder heads tp, tq.
Cooling of cylinders #1 to #6 is made uniform, variations in combustion performance of each cylinder #1 to #6 are suppressed, and output is made uniform.

The cooling water return passage 7 is located in the space 4 of the V7 cane.
It rises slightly upward from the connection portion with the cooling water outlets 17p and 17q, and is connected to a cooling water inlet 22 provided near the upper end of a first tank 21 disposed on the Mitsushiron side of the radiator 8. Therefore, the cooling water return passage 7 is connected to the radiator 8 without passing through the side of the engine CE.

On the rear side of the main body 28 of the radiator 8 in the longitudinal direction of the vehicle,
Fans 27 and 28 are provided for introducing outside air into the radiator body, and the fan 27 placed on the Mitsushiron side is the main cooling fan that rotates when the vehicle is warm. Most of the rotation locus A is located on the Mitsushiron 5 side (the mission 5 side from the mating surface of the engine CE and the mission 5), and behind the main cooling fan 27 is a large portion formed above the mission 5. Space part B is located there. On the other hand, the fan 28 placed on the engine side is a sub-cooling fan that cools a condenser (not shown) placed in front of the radiator 8, and rotates when the air conditioner is operated.

A second tank 24 located on the engine side of the radiator 8
A cooling water outlet 29 is provided near the lower end, and the cooling water outlet 29 and the inlet of the water pump 6 are connected to a SAXILON passage 9 in which a thermostat 11 is disposed.
communicated through. Therefore, since the radiator 8 is a cross-flow type, compared to a radiator in which both tanks are arranged at the upper and lower ends of the radiator body,
The height of the radiator 8 can be suppressed without reducing the cooling area of the radiator body (core) 26, and the bonnet 30 can be set at a lower position.

In addition, although the bonnet is low, the main cooling fan 27 is placed on the Mitsushiron side, so the radiator main body 26
The amount of air passing through the radiator 8 can be further increased.
The heat dissipation capacity of can be increased.

Furthermore, since the cooling water return passage 7 has a layout that utilizes the V-shaped space 4 located at a relatively high position, it can be smoothly extended to a high position up to the cooling water inlet 22, making it more compact. Cooling water injection and air bleeding can be done smoothly. In addition, since the cooling water return passage 7 as well as the suction passage 9 are not arranged on the side of the engine CE, the lateral space on the radiator 8 side of the engine CE can be used effectively, and the engine room is freed up accordingly. It can be made more compact.

Furthermore, since the bypass passage 12 that returns the cooling water in the cooling water return passage 7 to the sucsigin passage 9 by bypassing the radiator 8 when the cooling water temperature is low is set relatively short, the cooling water discharge port 29 Nearby water jacket W
Coupled with the layout of the thermostat 11 disposed on the inlet side (so-called large-mouth thermostat type), hunting of cooling water in the water jacket W can be further suppressed, and the engine CE can be made more compact.

Note that 31 is a heater for heating the inside of the vehicle, a heater cooling water (hot water) supply passage 32 is branched from the cooling water return passage 7, and a heater cooling water return passage 33 is connected to the water pump 6.
The turnflow type water jacket W improves heating performance.

[Brief explanation of drawings]

1, 2, and 3 are a plan view, a front view, and a screen view of a horizontally mounted six-cylinder V-type engine and its cooling device, respectively, showing the actual cooling of the present invention, and FIG. 2 is a diagram showing the flow direction of cooling water in the cooling device shown in FIG. 1. FIG. CE...engine, R8...cooling system, ip, lq
...First and second cylinder heads, 2...Cylinder block, 3...Crankshaft, 5-...Mission, 6
...Water pump, 7.Cooling water return passage, 8.
...Radiator, 9...Zaku 28 Fu passage, 11...
Thermostat, 12... Bypass passage, 14p, 1
4q...Water jacket inlet, 17p, 17q.
...Water jacket exit, 21.24...1st.
2nd tank, 27... Main cooling fan, 28... Sub-cooling fan.

Claims (1)

[Claims] (1) A power unit consisting of an engine and a transmission is mounted horizontally so that the axial direction of the crankshaft is in the left-right direction of the vehicle, and a cross-flow type radiator with tanks on both left and right sides is arranged approximately parallel to the above-mentioned axis, Of the tanks on both sides, the main cooling fan is installed on the side of the tank that forms the cooling water inlet to the radiator, and the auxiliary cooling fan that rotates in transient conditions such as when the air conditioner is operating is placed on the side of the tank that forms the cooling water outlet to the engine. In the cooling device for a horizontally mounted engine, the tank having the cooling water inlet is arranged on the transmission side, and the main cooling fan is arranged such that at least a part of its circular rotation locus is between the engine and the transmission. A water pump, an engine water jacket inlet communicating with a discharge port of the water pump, and an engine water jacket outlet are provided on the opposite side of the engine from the mating surface to the transmission side. , the water jacket of the engine is configured such that the main flow of the cooling water flows down to the side opposite to the transmission via the transmission side end cylinder, and a suction that communicates the intake port of the water pump and the cooling water discharge port; 1. A cooling device for a horizontal engine, comprising: a passage; and a cooling water return passage communicating between the outlet of the water jacket and the cooling water inlet.