JPH045723Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention relates to an internal combustion engine in which an intake control valve is provided in the intake passage to control the inflow direction and flow velocity of intake air into the combustion chamber. Regarding.

Conventional technology As a cooling device for an internal combustion engine, for example,
As described in Publication No. 161122, a thermostat that closes at low temperatures is installed in the cooling water path from the cylinder head's cooling water outlet to the radiator, and when the thermostat is closed, cooling water circulates inside the engine. There is known a structure in which a bypass passage is formed on the water pump suction side.

Then, for convenience in processing the cylinder head, the thermostat mounting part is formed on the intake manifold side, and the cooling water is guided from the water jacket inside the cylinder head to this thermostat mounting part, and then from there to the outlet passage. Cooling devices with a configuration in which cooling water is guided to a radiator through (See "Service Bulletin No. 517" issued in October 1959, etc.)

On the other hand, when the swirl inside the combustion chamber is low or high,
In order to strengthen EGR (exhaust gas recirculation), etc., an intake control valve is installed near the intake port in the intake passage of each cylinder, and an auxiliary intake port is installed to bypass this valve. There is an intake control device in which an intake control valve is closed to allow intake air to flow into the combustion chamber from the auxiliary intake port at high speed (Japanese Patent Application Laid-Open No. 19943/1983, etc.).

In addition, in order to be able to control the inflow direction and flow rate of intake air without forming a separate auxiliary intake port,
The applicant has also proposed an intake control device in which a notch is formed in a part of the valve body of the intake control valve, and intake air flows into the combustion chamber through this notch when the intake control valve is closed. has been done.

In this way, the intake control valves provided in the vicinity of the intake ports are opened and closed simultaneously for each cylinder, so generally, as seen in the above-mentioned Japanese Patent Application Laid-Open No. 1989-19943, the intake control valves installed near the intake ports are connected to the side surfaces of the cylinder heads and the intake manifold. A spacer-like control valve housing with a plurality of intake passages is sandwiched and fixed between the control valve housing and a rotating shaft extending in the direction of the cylinder row. It has a butterfly valve type structure with a fixed valve body.

Problems to be Solved by the Invention In the above-mentioned conventional cooling system, the pipes of the engine cooling system, specifically, the inlet passage and outlet passage connecting the radiator and the engine, the heater passage, etc., are all externally connected to rubber hoses, etc. Since the engine compartment is configured with a large number of pipes, and the piping is routed through the upper or lower part of the intake system and exhaust system, the layout within the engine room becomes complicated, which is a major factor in deteriorating maintainability. In particular, in an internal combustion engine equipped with the above-mentioned intake control device, a negative pressure actuator for driving the control valve, its piping, etc. are also required, making the configuration around the engine even more complicated.

Means for Solving the Problems In order to solve the above-mentioned problems, this invention provides a spacer-like control valve housing that is clamped and fixed between the side of the cylinder head and the intake manifold. A cooling water passage was formed. Specifically, a spacer-shaped control valve housing is clamped and fixed between an intake manifold to which a thermostat is attached and a cylinder head.
In an internal combustion engine in which a valve body is rotatably disposed in each intake passage of the control valve housing, the control valve is controlled so that the cooling water outlet of the cylinder head communicates with the inlet side of the thermostat. A jacket passage is formed through one end of the valve housing, and a cooling water passage is formed inside the control valve housing along the direction of the cylinder row, and one end thereof is opened to the intake manifold mounting surface to connect the outlet of the thermostat. It is characterized by communicating with the side and connecting the radiator inlet tube to the other end.

Operation In the above configuration, the cooling water discharged from the cooling water outlet of the cylinder head passes through the jacket passage portion of the control valve housing and reaches the thermostat on the intake manifold side. If the thermostat is open, the cooling water flows from the outlet side of the thermostat into one end of the cooling water passage in the control valve housing, flows inside the control valve housing in the direction of the cylinder row, and enters the inlet tube from the other end. After that, it is introduced into the radiator.

In other words, the cooling water outlet of the cylinder head is provided at one end in the longitudinal direction of the engine, but the inlet tube is connected to the opposite end, and external piping is connected to the top or bottom of the intake manifold. No need to move around.

Embodiment FIG. 2 is a plan view showing the overall structure of an internal combustion engine equipped with a cooling device according to this invention, as seen from above. The main body is a spacer-shaped control valve housing 3 which is clamped and fixed between a side surface and an intake manifold 2. FIG. 1 shows the control valve housing 3 attached to the intake manifold 2.
It is a front view shown in the state seen from the side.

The control valve housing 3 is made of, for example, aluminum alloy or cast iron and is integrally cast in the shape of a spacer having an outer shape that is approximately the same as the flange shape of the intake manifold 2.
A plurality of intake passages 4 are arranged in series so as to communicate with each intake port (not shown), and a plurality of mounting holes 5 are formed through the periphery, and at one end, A substantially rectangular jacket passage section 6 is formed through the jacket. Further, the upper edge portion 3a of the control valve housing 3 extends slightly above the flange shape of the intake manifold 3, and a cooling water passage 7 along the cylinder row direction is formed in the core at this portion. It is molded. At one end of the cooling water passage 7, more specifically, at one end on the jacket passage part 6 side, an inlet part 8 that opens to the mounting surface on the intake manifold 2 side is provided at a position relatively close to the jacket passage part 6, Further, at the other end, an outlet portion 9 that similarly opens toward the intake manifold 2 is provided at a position that is not covered by the intake manifold 2. still,
A tapered screw 9a is formed in this outlet portion 9, and a connector 10 can be connected thereto.

Further, a rotary shaft 11 is rotatably disposed through the control valve housing 3 in the cylinder row direction, and a disc-shaped valve body 12 is fixed to each rotary shaft 11. Located within the intake passage 4, each intake passage 4
It is configured to open and close at the same time. Note that a negative pressure actuator (not shown) or the like is used to drive the rotation shaft 11.

On the other hand, the control valve housing 3 configured as described above is held between the side surface of the cylinder head 1 and the intake manifold 2 as shown in FIG. The jacket passage section 6 is fixed together with the intake manifold 2 in this attached state.
A cooling water outlet (not shown) provided on the side surface of one end of the cylinder head 1 and an inlet side of a thermostat 13 supported by the intake manifold 2 are communicated with each other. An inlet portion 8 of a cooling water passage 7 adjacent to the jacket passage portion 6 communicates with the outlet side of the thermostat 13 via a passage inside the intake manifold 2. The thermostat 13 has a main body housed in a housing recessed in the side of the intake manifold 2 and a thermostat cover attached, so that the cooling water that passes through the thermostat 13 after warming up is , returns to the intake manifold 2 side through the internal passage of the thermostat cover, and flows to the inlet portion 8 of the cooling water passage 7 as described above. Further, the outlet portion 9 of the cooling water passage 7 is connected to an inlet tube 15 of the radiator 14 via a connector 10. Note that the outlet tube 16 of the radiator 14 is connected to the suction side of a water pump 17 provided at one end of the internal combustion engine. Further, 18 is an exhaust manifold.

In other words, the engine cooling water is supplied to the water pump 1.
7 to the water jacket on the cylinder block side, passes through the water jacket of the cylinder head 1, passes through the jacket passage 6 from the cooling water outlet, and reaches the thermostat 13. and,
If the warm-up is complete, the water flows from here through the cooling water passage 7 in the control valve housing 3 to the other end of the internal combustion engine, is guided to the radiator 14 by the inlet tube 15, and after heat dissipation is passed through the outlet tube 16. Then it returns to the water pump 17.

Therefore, it is possible to connect the inlet tube 15 to the end of the cylinder head 1 located at one end of the engine, opposite to the cooling water outlet.
There is no need to route the inlet tube 15 above or below the intake manifold 2. In addition, the thermostat 13 placed on the intake manifold 2 side
There is no need for any external piping, which simplifies the piping, reduces the risk of water leakage due to deterioration of the rubber hose, and improves reliability and durability.

Note that when the coolant temperature is low and the thermostat 13 is closed, the coolant does not flow from the thermostat 13 to the radiator 14 side. In this case, cooling water is circulated through a bypass passage (not shown) that communicates from the water jacket of the cylinder head 1 and the like to the suction side of the water pump 17.

Although not shown, if a hot water passage is provided in the intake manifold 2, a portion of the cooling water sent to the intake manifold 2 through the jacket passage 6 is diverted.

Effects of the invention As is clear from the above explanation, the cooling device according to the invention has an inlet tube at the end opposite to the cooling water outlet of the cylinder head provided at one end in the longitudinal direction of the engine. This increases the degree of freedom in the layout of the internal combustion engine and radiator, and also simplifies the external piping around the intake manifold, avoiding interference between the control valve drive system and piping. That is, the density in the engine room is reduced and maintainability is improved. Furthermore, the thermostat can be placed on the intake manifold side without external piping, making the layout of the cylinder head and cylinder block parts easier. In addition, since the control valve housing is formed independently in the form of a spacer, it is relatively easy to secure space for the cooling water passage and process it, compared to, for example, forming a similar cooling water passage in the intake manifold itself. Therefore, it can be easily formed by either core molding or secondary machining.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a control valve housing according to an embodiment of this invention, and FIG. 2 is a plan view schematically showing the overall structure of an internal combustion engine equipped with a cooling device according to this invention. 1... Cylinder head, 2... Intake manifold, 3... Control valve housing, 4... Intake passage,
6... Jacket passage section, 7... Cooling water passage, 8
...Inlet part, 9...Outlet part, 11...Rotation axis, 1
2... Valve body, 13... Thermostat, 14...
Radiator, 15...Inlet tube, 16
...Outlet tube, 17...Water pump.

Claims (1)

[Scope of utility model registration request] A spacer-shaped control valve housing is clamped and fixed between an intake manifold to which a thermostat is attached and a cylinder head, and a valve body is rotatably disposed in each intake passage of this control valve housing. In an internal combustion engine, a jacket passage is formed through one end of the control valve housing so as to communicate the cooling water outlet of the cylinder head with the inlet of the thermostat, and a jacket passage is formed inside the control valve housing in the direction of the cylinder row. An internal combustion engine characterized in that a cooling water passage is formed along the intake manifold, one end of which is opened at the intake manifold mounting surface to communicate with the outlet side of the thermostat, and the other end is connected to the inlet tube of the radiator. cooling system.