JPH0236895Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a cooling device for a water-cooled engine that is equipped with a thermostat in a cooling water passage connecting an engine main body and a radiator.

(Prior Art) Conventionally, in a cooling device for a water-cooled engine of this type, it has been common to form a water supply hole for replenishing cooling water at the top position of a radiator. (for example,
However, if the water supply hole is formed on the radiator side in this way, for example, when installing an engine in a vehicle, the radiator may be closed due to constraints such as the introduction position of the traveling air or the space in which the engine is mounted. If it is located below the engine body, a problem arises in that it is difficult to inject cooling water and bleed air.

Furthermore, in conventional cooling systems, the thermostat is fixedly installed in the cooling water channel, and replenishment of cooling water is performed when the cooling water temperature is low, in other words, when the thermostat is closed. Therefore, when replenishing cooling water from the water supply hole, the cooling water is supplied to the cooling jacket on the engine body side through the radiator, so it takes a relatively long time for the cooling water to flow into every corner of the engine body side. There was also this problem.

(Purpose of the invention) In view of the above-mentioned problems with conventional water-powered engine cooling systems, the present invention has been developed to ensure that cooling water is supplied and air is removed even when the engine body is located at a higher level than the radiator. The object of this invention is to provide a cooling device for a water-cooled engine that can reliably perform the cooling water supply operation and speed up the cooling water supply operation.

(Structure of the invention) In the present invention, as a specific means for achieving the above object, a thermostat case with a thermostat fitted therein is disposed close to the engine body, and the weighter jacket of the engine body is The upper side of the engine and the upper side of the radiator are connected through the thermostat case with a cooling water return pipe, and the cooling water inlet of the engine body and the lower side of the radiator are connected with a cooling water supply pipe. In a cooling device for a water-cooled engine, in which a bypass passage for bypassing the radiator is provided between a return pipe and a cooling water supply pipe, a cooling water supply hole is provided in the upper part of the thermostat case, and the cooling water is supplied through the water supply hole to the thermostat. The thermostat is formed to be removable, and is detachably attached to the water supply hole so that the thermostat can be supported in the fitted state by the water supply hole plug when the water supply hole plug is fitted. A valve port communicating with the bypass passage, which is opened and closed by the valve body of the thermostat, is located at a lower position facing the thermostat, and a valve port communicating with the engine body is located at a side position of the water supply hole through the cooling water return pipe. A first cooling water passage and a second cooling water passage communicating with the radiator are each opened.

(Example) Hereinafter, the case where the present invention is applied to a cooling device for an automobile water-cooled engine will be described as an example. FIG. 1 shows an automobile water-cooled engine.
Reference numeral 1 in the figure is the engine body. A radiator 2 is disposed in front of the engine body 1 with a fan 3 in between and located at a lower level than the engine body 1. A thermostat case 7 housing a thermostat 9 (described in detail later) is attached to a cooling water outlet 25 portion opening at the front of the engine body 1. A cooling water outlet 25 provided on the upper side of the radiator 2 and a cooling water inlet 27 provided on the upper side of the radiator 2 are connected to the cooling water return pipe 5 via the thermostat case 7, and to the cooling water inlet of the engine body 1 (not shown). (omitted) and radiator 2
The cooling water outlets 28 provided on the lower side of the cooling water outlet 28 are connected to each other by a cooling water supply pipe 6 having a water pump 4 in the middle thereof, thereby forming a series of cooling water circulation paths.

As shown in FIGS. 2 and 3, the thermostat case 7 has a large-diameter water supply hole 21 extending downward from its upper end surface 7a and a small-diameter thermostat housing hole 22 coaxially communicating with the water supply hole 21. It is formed into a stepped deep hole shape. The water supply hole 21 and the thermostat housing hole 22 are provided with the engine body 1.
A first cooling water passage 15 communicating with a cooling water outlet 25 of
and a second cooling water passage 16 communicating with the radiator 2 via the cooling water return pipe 5 are opened laterally to the water supply hole 21 and the thermostat housing hole 22, respectively. Moreover, at the center position of the bottom surface 22a of the thermostat housing hole 22,
A valve port 23 of the bypass passage 17 that communicates the thermostat housing hole 22 with a suction port (not shown) of the water pump 4 is formed to face the water supply hole 21 .
That is, the first cooling water passage 15, the second cooling water passage 16, and the bypass passage 17 are communicated with each other via the water supply hole 21 and the thermostat housing hole 22. A cap assembly 10, which will be described later, is fitted into the water supply hole 21 and the thermostat housing hole 22. In this case, the bottom surface 22a of the thermostat housing hole 22 is a valve seat for the valve body 31 of the thermostat 9, which will be described later. A collar 3 formed on the outside of the outer end of the water supply hole 21
0 functions as a locking portion for a water supply hole plug 8, which will be described later (see FIG. 2).

The cap assembly 10 includes a water supply hole stopper 8 that is fitted into the mouth end of the water supply hole 21 to close the water supply hole 21, and a water supply hole plug 8 that is located inside the water supply hole stopper 8 and closes the water supply hole 21 according to the temperature of the cooling water. It is constructed by integrally connecting a thermostat 9 which acts to open and close the passage 17.

The water supply hole plug 8 has a conventionally known configuration, and is a plug having a locking piece 41 that is locked to the collar 30 of the thermostat case 7 at the opposite position of the opening end, as shown in FIG. A cylindrical base 43 is fixed to the inner surface 40a of the main body 40, and
A first valve body 46 biased by a first spring 44 and a second spring 4 are attached to the tip of the base 43.
5 and a second valve body 48 biased by the valve body 5, and when the water supply hole 21 is fitted into the water supply hole 21 (see FIG. 2), the first valve body 47 acts as described below. A valve port 33 formed in the support body 32 of the thermostat 9 can be closed. Further, on the inside of the plug body 40, a flange 32a formed at the upper end of a support 32 of the thermostat 9, which will be described later, is removably locked by locking pieces 41, 41 of the plug body 40. .

In addition, in FIGS. 2 and 3, reference numeral 49 is a ventilation hole formed in the plug body 40, 50 is a communication hole formed in the base 43, and 51 is a fresh air hole that is opened and closed by the second valve body 48. This is the introduction hole.

The thermostat 9 is installed in a support 32 that is locked to the water supply hole plug 8 side and that is attached to and detached from the thermostat housing hole 22 integrally with the water supply hole plug 8, and expands and contracts according to the temperature of the cooling water. It is moved forward and backward by wax (not shown) and is pulled inward by a spring 35 via a valve body 36 that connects and connects the first cooling water passage 15 and the second cooling water passage 16. It is constructed by attaching a conventionally known thermostat main body 34 having a valve body 31 which is energized, and the valve body 31 opens and closes the valve port 23 of the bypass passage 17. Note that when the valve body 31 is installed in the thermostat housing hole 22 as shown in FIG.
A spring 35 urges the valve port 23 to open.

Next, to explain how to use this cap assembly 10 and its function, this cap assembly 10 integrally connects a water supply hole plug 8 and a thermostat 9 as shown in FIGS. 2 and 3. Water supply hole 21 and thermostat housing hole 22 formed in the upper part of thermostat case 7 in the state
It is attached and detached.

First, install the cap assembly 10. In this case, fit the thermostat 9 into the thermostat housing hole 22, and then apply the water supply hole stopper 8 to the mouth end of the water supply hole 21. The locking piece 41 of the plug body 40 of the water supply hole plug 8 is rotated.
is locked to the collar 30 on the thermostat case 7 side (Fig. 2, illustration omitted).

In this state, the water supply hole plug 8 is connected to the plug body 40.
The upper end flange 3 of the support 32 of the thermostat 9 is located between the inner surface of the thermostat case 7 and the upper end surface 7a of the thermostat case 7.
2a is sandwiched and supported, and is fitted airtightly and watertightly into the mouth end of the water supply hole 20, and in this case, the second valve body 46 (its packing 47) is held by the spring force of the first spring 44. Valve port 33 of support body 32
The valve port 33 is closed by being pressed toward the side (that is, the water supply hole 21 is completely closed by the water supply hole stopper 8).

On the other hand, the valve body 31 of the thermostat 9 is biased by the spring force of the spring 35 in the direction of opening the valve port 23 on the bypass passage 17 side.

When the engine is operated in this state, the valve body 36 of the thermostat 9 is displaced in accordance with the cooling water temperature to perform a known action. That is, if the engine is started cold now, the cooling water temperature is low, so the wax inside the thermostat body 34 is contracted, and the spring force of the spring 35 causes the valve body 36 to move in the valve opening direction. The valve body 31 is displaced in the valve opening direction, the valve port 23 is opened, and the first cooling passage 15 is directly connected to the suction port of the water pump 4 via the bypass passage 17. Therefore, after the cooling water flows into the first cooling water passage 15 from the cooling water outlet 25 of the engine body 1, the cooling water flows directly through the bypass passage 17 without flowing to the radiator 2 side (that is, without being cooled). The water is allowed to flow into the water jacket of the engine body 1. Therefore, the speed at which the cooling water temperature rises is accelerated, and warm-up of the engine is promoted.

On the other hand, if the cooling water temperature rises above the predetermined temperature (after the engine has been warmed up), the thermostat 9
The wax inside expands, causing the valve body 36 and the valve body 31 to move downward against the spring force of the spring 35, so that the valve body 31 closes the valve port 23.
Therefore, the cooling water discharged from the engine body 1 side to the thermostat case 7 side flows from the first cooling water passage 15 to the second cooling water passage 16 and then through the cooling water return pipe 5 into the radiator 2, and then flows into the radiator 2 through the cooling water return pipe 5. After being cooled by heat exchange with the running wind etc. in the radiator 2, it is again supplied to the engine body 1 side through the cooling water supply pipe 6 to perform a predetermined cooling effect.

Further, the water supply hole plug 8 performs a pressure regulating action within the cooling water passage. That is, when the pressure in the cooling passage becomes higher than the set pressure set by the first spring 44, the pressure applied to the lower surface of the first valve body 46 causes the first valve body 46 to The valve port 33 is opened and steam (including water) flows through the valve port 33.
The cooling water is discharged to the outside through the vent hole 49 of the stopper body 40, and the pressure within the cooling water passage is maintained at the set pressure. Conversely, when the pressure in the cooling water passage becomes lower than the set pressure, fresh air is introduced from the vent hole 49 of the stopper body 40 through the inlet hole 51 of the first valve body 46, and the air is introduced into the second valve body. The second valve body 48 is opened against the spring force of the second spring 45 due to the atmospheric pressure applied to the cooling water passage, and the atmosphere is introduced into the cooling water passage and the pressure in the cooling water passage reaches the set pressure. maintained.

On the other hand, cooling water is supplied from the water supply hole 21,
In this case, as shown in FIG. 3, the thermostat 9 is removed from the thermostat case 7 together with the water supply hole stopper 8, so that the valve port 23 is always open facing the water supply hole 21 when water is supplied. The first cooling water passage 15 and the second cooling water passage 17 are communicated with each other.

Therefore, the cooling water injected into the water supply hole 21 mainly flows to the bypass passage 17 side from the valve port 23 which faces the water supply hole 21 and opens at a position below the water supply hole 21.
From here, it flows into the water jacket of the radiator 2 and the engine main body 1 from below. Therefore, the inside of the radiator 2 and the water jacket are gradually filled with cooling water from the bottom side while pushing the air upward, making it easier and more reliable to bleed the air, and the cooling water can be quickly removed. Injection will be accomplished. Therefore, in this embodiment, it is not necessary to install a dedicated air bleed path.

Furthermore, since the water supply hole 21 is formed in the upper part of the thermostat case 7 placed on the side of the engine body 1, even if the radiator 2 is located lower than the engine body 1 as in this embodiment, However, by supplying water through the water supply hole 21, it is possible to reliably supply cooling water and air to every corner of the water jacket and radiator of the main body 1, and also to ensure that air is removed. .

In this embodiment, the water supply hole plug 8 and the thermostat 9 are integrally connected and connected to the water supply hole 2.
The thermostat 9 of the present invention can be attached and detached from the water supply hole 21 and when the water supply hole plug 8 is fitted, the thermostat 9 can be attached and detached integrally with the water supply hole 21 It is only necessary that the water supply hole plug 8 and the thermostat 9 be supported in the attached state by the plug 8. Therefore, in other embodiments of the present invention, for example, the water supply hole plug 8 and the thermostat 9 may be constructed as separate structures and they may be separated. It can also be configured to be detachable.

(Effects of the invention) The water-cooled engine cooling device of the invention has a water supply hole formed in the upper part of a thermostat case provided close to the engine body, and a thermostat located at a lower position opposite to the water supply hole. Since it forms the valve opening of the bypass passage that is opened and closed by the valve body, for example, even if the engine is installed in a vehicle with the radiator located lower than the engine body, there will be no water from the water supply hole. The injected cooling water mainly flows from the valve port through the bypass passage into the radiator and the water jacket of the engine body from below, and fills the inside of these while pushing air upward. This provides the effect that the function of supplying cooling water to the radiator and water jacket and the function of removing air from these can be performed reliably and quickly without providing any dedicated air release path.

Furthermore, since the thermostat is configured to be removable from the water supply hole, by removing the thermostat when supplying water, the cooling water does not have to pass through the radiator, which has high flow resistance. Water can be supplied directly to the engine body, which has the effect of speeding up the water supply work.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of an automobile water-cooled engine equipped with a cooling device according to an embodiment of the present invention, Fig. 2 is an enlarged sectional view of a portion of Fig. 1, and Fig. 3 is a cap assembly shown in Fig. 2. It is a state change diagram of . 1...Engine body, 2...Radiator, 3...
…Fan, 4…Water pump, 5…Cooling water return pipe, 6…Cooling water supply pipe, 7…Thermostat case, 8…Water supply hole plug, 9…Thermostat, 10…Captain Assembly, 21...
...Water supply hole, 22...Thermostat housing hole.

Claims (1)

[Scope of utility model registration request] A thermostat case with a thermostat fitted therein is disposed close to the engine body, and cooling water is supplied to the upper side of the weighter jacket of the engine body and the upper side of the radiator through the thermostat case. A return pipe connects the cooling water inlet of the engine body and the lower side of the radiator with a cooling water supply pipe, and a bypass passage bypasses the radiator between the cooling water return pipe and the cooling water supply pipe. In the cooling device, a cooling water supply hole is formed in the upper part of the thermostat case so that the thermostat can be attached and removed through the water supply hole, and a water supply hole plug is provided in the water supply hole. However, when the water supply hole plug is in the fitted state, the thermostat is detachably attached so that the water supply hole plug can support the thermostat in the fitted state, and furthermore, the thermostat is installed at a lower position opposite to the water supply hole. A valve port communicating with the bypass passage that is opened and closed by a valve body, and a first cooling water passage communicating with the main body of the engine via the cooling water return pipe and the radiator are located on the side of the water supply hole. A cooling device for a water-cooled engine, characterized in that a second cooling water passage communicating with the first cooling water passage is opened.