JPH03202616A - Cooling device for internal combustion engine - Google Patents

Abstract

PURPOSE:To shorten a cooling hose by forming a thermostat case in parallel with the outlet side cooling water passage for the cooling water in a single piece arrangement, and forming in it a thermostat chamber which is isolated from the outlet side cooling water passage by a bulkhead interposed. CONSTITUTION:In an arrangement where the cooling water for an engine 1 is circulated through a radiator 4, a thermostat case 13 is formed in parallel with the outlet side cooling water passage 14 for the cooling water in a single piece layout, and inside of it a thermostat chamber 15 is formed which is isolated from the outlet side cooling water passage 14 by a partition wall 16. An opening 18 is provided in the side wall of this thermostat case 13, and a nozzle 19 for water pump is mounted on this opening 18. An outlet nozzle 20 for heater and an outlet nozzle 21 for throttle body are mounted on the side wall of the thermostat case 13, while an inlet nozzle 22 for heater and an inlet nozzle 23 for throttle body are installed at a mount seat 17 provided on the outlet side cooling water passage 14.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to improvements in cooling devices for internal combustion engines.

[Conventional technology]

Since various devices are packed in the engine room at a high density, it is necessary to make each device as compact as possible. One of them is how the cooling hoses are arranged in the engine cooling system.

In the conventional engine cooling system, as shown in FIG. 8, a thermostat case 3 containing a thermostat is attached to the cooling water outlet 2 of the engine I, and the thermostat case 3 and the inlet nozzle 5 of the radiator 4 are connected to a hose 6. connected. On the other hand, an outlet nozzle 7 of the radiator 4 is connected to a pump 8 of the engine 1 via a hose 9.

At the time of starting the engine, when the temperature of the engine I has not yet risen, the cooling water is sent from the heater nozzle lO provided in the thermostat case 3 to the heater 1) in order to prevent it from being cooled by the radiator 4. The cooling water that has been used in the heater 1) is returned to a nozzle 12 provided on the hose 9.

That is, the thermostat in the thermostat case 3 is filled with a thermal expansion medium such as wax. Since this wax does not expand while the temperature of the engine l is low, its valve remains closed and the cooling water does not flow to the radiator 4, but bypasses the radiator 4 and flows to the heater 1.
). As a result, the temperature of the engine 1 is raised quickly, and the interior of the vehicle is heated by the heater 1). Next, when the temperature of the engine 1 rises to a predetermined temperature, the wax inside the thermostat expands and opens the valve, and most of the cooling water flows to the radiator 4. When the temperature of the cooling water is lowered, some of the water flows to the radiator 6. The cooling water begins to flow to the heater 1).

Thereby, the engine l is cooled by the cooling water without overheating. In this conventional example, since the thermostat is provided at the engine cooling water outlet, this method is hereinafter referred to as the outlet side control method.

Next, in the conventional example shown in FIG.
is provided on the water pump 8 side of the engine 1, that is, on the cooling water inlet side of the engine, and is an inlet side control method as opposed to the outlet side control method shown in FIG. Regarding other parts, the same parts as those of the conventional example shown in FIG. 8 are given the same reference numerals, and the explanation thereof will be omitted.

Next, the engine cooling system shown in Japanese Utility Model Publication No. 64-1451 has a cooling water nozzle in which the cooling water from the radiator is placed in the thermostat case, a water pump nozzle connected to the engine's water pump, and an intake air nozzle. A riser water nozzle that receives cooling water from a portion of the riser of the manifold and a heater nozzle that receives cooling water from the heater are provided. The engine is also provided with a radiator nozzle, a heater nozzle, and a riser nozzle. The hoses are then connected to the 2 auto pump nozzles and the 2 auto bombs installed on the engine, the radiator nozzle and radiator cooling water nozzle installed on the engine, the radiator cooling water outlet nozzle, and the cooling water inlet nozzle installed on the thermostat case. to form the engine's main cooling water circuit, and on the other hand, connect the heater nozzle installed on the engine to the heater cooling water nozzle, and the heater cooling water outlet nozzle to the heater cooling nozzle installed on the thermostat case with a hose. At the same time, a bypass circuit is formed by connecting the riser nozzle installed on the engine to the riser's cooling water inlet nozzle, and from the riser's cooling water outlet nozzle to the riser water nozzle installed in the thermostat case. are doing.

(Problems to be Solved by the Invention) In the conventional cooling device described above, the length of the hose that connects the cooling water outlet nozzle of the radiator to the water pump of the engine is long, and this hose is thick, so it takes up space in the engine room. There is a problem in that the layout of other equipment in the engine room becomes difficult due to the large size.

In particular, in the outlet side control method shown in Fig. 9, the temperature of the wax filled in the thermostat is controlled to prevent premature start-up of the engine and overheating of the engine due to thermal expansion of the wax filled in the thermostat. The mounting position of the thermostat case must be selected so that the temperature of the engine and the temperature of the engine are the same, or the two temperatures correspond. Due to this relationship, the mounting position of the thermostat case is restricted, and the connection of the hose between the radiator's cooling water outlet nozzle and the engine's water pump is not simplified, and the layout of other equipment in the engine room is restricted. There is a problem.

In addition, the cooling device shown in Japanese Utility Model Publication No. 1451/1983 has three nozzles on the engine and connects hoses to each one, so the hoses are placed around the engine, and the equipment mounted around the engine This is undesirable because it interferes with the hose arrangement, and the hose arrangement is not orderly.
There is a problem in that it becomes difficult to layout the mounted equipment in the engine room.

The present invention provides a cooling device for an internal combustion engine that uses an outlet side control method to ensure thermostatic control, and that allows for compact hose arrangement by shortening each connecting hose.

(Means for Solving the Problems) Means according to the present invention for solving the above problems includes a thermostat case 13 that houses a thermostat 25 used in a cooling circuit of an internal combustion engine, and a cooling water passage 14 on the outlet side of the cooling water. are arranged in parallel and integrally formed, and a thermostat chamber 15 isolated from the outlet side cooling water passage 14 via a partition wall 16 is formed inside the thermostat chamber 15, and a water pump nozzle 19 is opened in the side wall of the thermostat chamber 15.
In addition, a heater outlet nozzle 20 and a throttle body outlet nozzle 21 are provided, while an artificial heater nozzle 22i is opened in the side wall 14 of the outlet side cooling water passage.
3 and an inlet nozzle 23 for the throttle body.

(Function) Since the present invention is configured in this way, the thermostat 25
The thermostat case 13 housing the cooling water and the cooling water outlet side cooling water passage 14 are arranged in parallel and integrally attached to a predetermined location of the engine 1. Inside, a thermostat chamber 15 is formed which is isolated from the outlet-side cooling water passage 14 via a partition wall 16, and a heater bomb nozzle 19 is provided in the side wall of the thermostat chamber 15. A body outlet nozzle 21 is provided, and a heater inlet nozzle 22 and a throttle body inlet nozzle 23 are provided opening in the side wall of the outlet side cooling water passage I4, so that these nozzles also connect the thermostat case 13 and the cooling water. It is integrated with the outlet side cooling water passage 14 and is concentrated in one place. Since the thermostat case 13 and the cooling water outlet side cooling water passage 14 are in parallel and open to the radiator 4 side, the radiator 4, the thermostat case 13, and the cooling water outlet side cooling water passage 14 are connected at the shortest distance. In addition to being connected, the water pump nozzle 19
and water pump 8 are also connected via the shortest distance. Further, since each nozzle is concentrated in one place, bypass system hoses for the heater 1) and the throttle body 37 are also arranged in an orderly manner. Since the thermostat case 13 is directly attached to the engine 1, the thermal expansion medium filled in the thermostat 25 expands following the temperature of the engine 1, and cooling control of the engine 1 is reliably performed. An embodiment of the invention will be described in detail. In FIG. 1, the thermostat case 13 and the outlet side cooling water passage 14 are integrally formed in parallel, and a thermostat chamber 15 is formed inside thereof, which is separated from the outlet side cooling water passage 14 by a partition wall 16. . Reference numeral 17 is a seat for attaching it to the engine. An opening 18 is formed in the side wall of the thermostat case 13, and an autobump nozzle 19 is attached to this opening 18. Furthermore, a heater outlet nozzle 20 and a throttle body outlet nozzle 21 are attached to the side wall of the thermostat case 13. Furthermore, a heater nozzle 22 and a throttle body inlet nozzle 23 are attached to the seat 17 of the outlet side cooling water passage 14.

In this embodiment, as shown in FIGS. 4 to 7, the heater outlet nozzle 20, the throttle body outlet nozzle 21, the heater artificial nozzle 22, and the throttle body inlet nozzle 23 are assembled so as to face the same direction. It is attached with. In this embodiment, as shown in FIGS. 4 to 7, the water pump nozzle 19 is oriented in the opposite direction to the heater outlet nozzle 20, etc. of the - group, and toward the water pump of the engine 1. installed.

Further, in FIG. 4, reference numerals 46 and 47 indicate bolt holes formed in the flange 33 for fastening to the thermostat cap 30. 46 is a measurement dust for measuring the temperature of cooling water, for example. In FIG. 1, 24 is a cooling water extraction nozzle for extracting cooling water for cooling the oil cooler and the turbo mechanism.

25 is a thermostat provided in the thermostat case I3, which includes a thermal expansion medium filling part 26 and a coil spring 2.
7, a valve 28, and a valve seat 29. 30
is the thermostat cap, and the outlet side cooling water passage 1
A cooling water outlet nozzle 32 communicating with the thermostat case 13 and a cooling water inlet nozzle 3I communicating with the thermostat case 13 are integrally formed in parallel. 33 is a flange provided on each of the thermostat case 13i5 and the thermostat cap 30, and the thermostat 25
is inserted into the thermostat case 13, the valve seat 29 of the thermostat 25 is sandwiched between the thermostat case 13 and the inlet of the thermostat cap 30, and the flange 3 is inserted into the thermostat case 13.
By tightening 3 with bolts, the thermostat 25
is fixed inside the thermostat case 13. The operation of this embodiment configured in this way will be described next.

In FIG. 2, the thermostat case 13, in which the flange 33 is fastened and the thermostat 25 is assembled, is attached to the cooling water outlet of the engine 1 (the conventional outlet side control is attached to the seat). Then, the cooling water artificial nozzle 31 and the cooling water outlet nozzle 5 of the radiator 4 are connected with a hose 34. On the other hand, the cooling water outlet nozzle 32 and the cooling water inlet nozzle 7 of the radiator 4 are connected with a hose 35. Further, the water pump nozzle 19 and the engine l engine bomb 8 are connected by a hose 36. In the example shown in FIG. 2, the thermostat case 13 and the outlet cooling water passage 14 are attached to the engine l so that the thermostat case 13 and the outlet cooling water passage 14 are horizontal, but as shown in FIG. The thermostat case 13 may be attached to the engine l with the outlet side cooling water passage 14 facing upward and the thermostat case 13 facing downward. By connecting the hoses in this way, the temperature of the cooling water supplied into the water jacket of the engine L by the heater bomb 8 is raised and flows out into the outlet side cooling water passage 14, and passes through the hose 35 to the radiator 4. It flows into the air and cools down. The cooled cooling water then passes through the hose 34 from the cooling water outlet nozzle 5 to the thermostat case 1.
Water flows into the engine 1 from the opening 18 through the hose 36 and is supplied to the engine 1 by the water pump 8.

This main circulation system of cooling water has one cooling water outlet in the engine 1, and the thermostat case 13 and the cooling water passage I on the outlet side.
4 are integrated and arranged in parallel, and an opening 18 is formed in the thermostat case 13 to form an autobomb nozzle 19. The two thick hoses 34 and 35 connected by such a circulation system integrate the thermostat case 13 and the outlet side cooling water passage 14 in parallel and are connected to the cooling water inlet nozzle 31 via the thermostat cap 30. and the cooling water outlet nozzle 32 are integrated so that they face toward the radiator 4, the hose connection distance is minimized, and the connected hoses are connected neatly without crossing each other, so that the engine 1 and the radiator 4 can be connected in an orderly manner. It can be stored compactly between Furthermore, the hose 36 can also be connected over the shortest distance.

Next, to explain the bypass system, first of all, the heater 1)
is connected to the heater inlet nozzle 22 provided in the outlet side cooling water passage 14 with a hose 38 to supply cooling water heated by the engine l, and its outlet is connected to the thermostat case 13. It is connected to the attached heater outlet nozzle 20 with a hose 39, and the cooling water is returned into the thermostat case 13. Further, the throttle body 37 is connected to a throttle body inlet nozzle 23 provided in the outlet side cooling water passage 14.
The cooling water heated by the engine 1 is supplied by a hose 40, and its outlet is connected by a hose 41 to a throttle poday outlet nozzle 21 attached to the thermostat case 13. The cooling water is returned to the thermostat case 13.

The bypass system hoses 38, 39, 40, 41 are connected to the nozzles 20, 21, 22, 23 because they are concentrated in the thermostat case 13 and the outlet side cooling water passage 14. The hoses that flow are also collected in an orderly manner. In addition, an oil cooler 42, a turbo mechanism 4
3 is cooled by cooling water taken out from a cooling water take-out nozzle 24 provided in the outlet side cooling water passage 14, and its connection hose 44 is connected to the hose 36 at the shortest distance.

The work to assemble this cooling water circulation system is to install the thermostat 25.
This can be completed by simply fixing the assembled thermostat case 13 to the engine l and connecting each hose.

Next, control of the cooling system will be explained. The thermostat case 13 is directly attached to the engine 1, and the heat of the coolant heated by the engine 1 is transferred to the coolant in the thermostat chamber 15 through the partition wall 16.
The thermal expansion medium filled in the thermostat expands following the temperature of the engine 1. First, when the engine 1 is started, the temperature of the engine 1 is low, so the thermal expansion medium filled in the thermostat does not expand, and the valve 28 of the thermostat is pressed against the valve seat 29 by the spring 27 and closed. Therefore, at this stage, the cooling water sent into the jacket of the engine 1 by the over pump 8 does not flow to the radiator 4, but instead flows through the hoses 40, 41 to the heater 1). It flows into the throttle body 37, flows into the thermostat chamber 15, flows out through the opening 18, and is again sent into the oak jacket of the engine l by the auto pump 8.

In this way, the cooling water bypasses the radiator 4 and is not cooled down, so the temperature of the engine 1 increases quickly and the engine l
The start-up is done quickly.

Next, when the temperature of the engine 1 reaches a predetermined temperature, the thermal expansion medium of the thermostat 25 expands and pushes up the valve 28 against the elastic force of the spring 27 to open the valve, and the cooling water passes through the hose 34. It flows out from the opening 18 and is supplied into the oak jacket of the engine 1 by the oak pump 8.

As a result, the coolant heated by the engine 1 passes through the outlet side coolant passage 14 and the hose 35, flows into the radiator 4, and is cooled down 6, and the engine 1 is controlled to a predetermined temperature to prevent overheating. . In addition, some cooling water
Heater 1). It also flows to throttle poday 37, heater 1
) to heat the room and cool the throttle pod 37. The oil cooler 42 and the turbo mechanism 43 are
It is constantly cooled.

(Effects of the Invention) As described in detail above, according to the present invention, the thermostat case and the cooling water outlet side cooling water passage are integrally formed in parallel, and the ii′
Since a thermostat chamber is formed that is isolated from the cooling water passage on the outlet side described in i7, a nozzle for the oak pump is provided through an opening in the side wall of the thermostat chamber, and an outlet nozzle for the heater, an outlet nozzle for the throttle body, and the outlet side cooling water passage are provided. It becomes possible to provide an inlet nozzle for the heater and a nozzle for the throttle body by opening on the side wall of the water passage.
The hose connection between the radiator and the engine and the hose connection between the radiator and the water pump can be minimized, and the hoses can be arranged in an orderly manner without crossing each other, and the bypass circuit Since the nozzles are arranged in a concentrated manner, the hoses can be arranged in an orderly manner, making the layout in the engine room easier.

In addition, the thermostat case can be installed directly on the engine,
In addition, since the thermostat chamber is isolated by a partition wall, the thermal expansion medium filled in the thermostat reliably follows the engine temperature, ensuring reliable control and reducing the number of parts required for one assembly. Its ease of assembly can be improved.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view of an embodiment of the present invention, Fig. 2 is a plan view showing an example of hose arrangement when the thermostat case and the outlet cooling water passage are horizontal, and Fig. 3 is a diagram of the thermostat case. Fig. 4 is a front view of the thermostat case, Fig. 5 is a rear view of Fig. 4, and Fig. 6 is a 4 is a right side view of FIG. 4, FIG. 7 is a plan view of FIG. 4, FIG. 8 is a plan view of a conventional inlet side control system, and FIG. 9 is a plan view of a conventional exit side control system. 13-... Thermostat case 14... Outlet side cooling water passage 15... Thermostat chamber 16... Partition wall 18... - Opening I9 - Oak pump nozzle 20... Heat outlet nozzle 21- ... Throttle body outlet nozzle 22 ... Heater inlet nozzle 23 ... Throttle body inlet nozzle 25 ... Thermostat patent

Claims (1)

[Claims] (1) A thermostat case that houses a thermostat used in the cooling circuit of an internal combustion engine and a cooling water outlet side cooling water passage are integrally formed in parallel, and the outlet side cooling water passage is connected to the cooling water passage through a partition inside the case. A water pump nozzle is provided with an opening in the side wall of the thermostat chamber, and a heater outlet nozzle and a throttle body outlet nozzle are provided, while an opening is provided in the side wall of the outlet side cooling water passage. A cooling device for an internal combustion engine, characterized in that a heater inlet nozzle and a throttle body inlet nozzle are provided.