JPH11182223A - Thermostat housing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermostat housing having few outside piping, in a compact size, and for preventing generation of hunting on a thermostat for selectively controlling opening of a cooling water passage by improving a circulating passage of cooling water and the thermostat housing. SOLUTION: A thermostat housing 10 provided with a cooling water thermostat 9 for selectively opening a cooling water passage of an engine 1 inside, is provided with a first flange F1 connected to an engine main body, a second flange F2 for installing an oil filter 8, and a third flange F3 for installing an oil cooler 7, and three flange surfaces are arranged on flat surfaces which are different from each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention improves the cooling performance of an oil cooler by devising a circulation path of engine cooling water, and reduces the number of piping around the engine body to simplify the arrangement around the engine. The present invention relates to an improvement in a cooling water circulation structure of an engine which enables downsizing.

[0002]

2. Description of the Related Art In engines such as automobiles, miniaturization and weight reduction are progressing, and not only the engine body but also piping arranged outside the engine body are omitted as much as possible to save space and weight. It is strongly demanded that the cooling water circulation passage occupying most of the external piping be improved.

In this cooling water circulation structure of an engine, cooling water discharged from a cooling water pump is supplied to a cylinder block and a cylinder head to cool an engine body, and then the cooling water is discharged from, for example, a cylinder head. Radiator path to the thermostat via the radiator, heater core path that exits the cylinder head and returns to the cooling water pump via the heater core for vehicle interior heating, and cooling water pump from the cooling water pump to the oil cooler The cooling water pump is circulated to the suction port of the cooling water pump through four passages including an oil cooler passage returning to the above, and a bypass passage that bypasses these devices and directly goes out of the cylinder head to the thermostat. I have to.

That is, since the temperature of the cooling water after cooling the cylinder block and cylinder head of the engine is increased by heat exchange, the cooling water passes through a radiator (radiator) to prevent overheating of the engine. A radiator passage is provided to circulate cooling water. Excessive cooling of the cooling water at the start of the engine or in cold weather not only deteriorates the engine output and fuel consumption, but also has a negative effect such as low-temperature wear of the cylinder. For this purpose, a bypass passage bypassing the radiator is provided.

The above-described radiator passage and bypass passage are controlled to be switched so that the cooling water falls within an appropriate temperature range. This switching control is performed, for example, at one inlet of a two-valve thermostat. A radiator passage is connected to the other, a bypass passage is connected to the other inlet, and the temperature of the cooling water flowing through the temperature-sensitive portion filled with wax or the like is used to make use of expansion or contraction of the temperature-sensitive portion. This is done by opening only the passage.

That is, when the cooling water becomes high temperature, the radiator passage is opened and the bypass passage is closed, and when the cooling water becomes low temperature, the radiator passage is closed. , The bypass passage is open. In addition, the cooling water circulation structure further includes a heater core passage for cooling the engine body and circulating the warmed cooling water also in the heater core for heating the vehicle interior.

Further, in order to cool the lubricating oil of the engine, an oil cooler passage is provided to supply cooling water to the oil cooler. However, in the cooling water circulation structure of the prior art, these radiator passages,
Four systems of cooling water circulation passages, including a heater core passage, an oil cooler passage, and a bypass passage, and an oil circulation passage for lubricating oil are required. Since piping is performed in a mixed state while avoiding objects, a large number of piping, a large piping space and a space for piping work are required, and there is a problem that miniaturization of the engine is hindered.

[0008] In view of these problems, one of the applicants of the present invention has proposed an oil cooler and an oil filter integrally mounted on a thermostat housing and replacing a part of the external piping with the internal piping in the thermostat housing. A structure of a thermostat housing for an internal combustion engine capable of saving space and improving the efficiency of mounting work and maintenance work is disclosed in Japanese Patent Laid-Open No. 9-13.
935 proposes this.

[0009]

However, unfortunately,
In a cooling water circulation structure using a thermostat housing, which is a configuration of the prior art, a circulation system configuration diagram of FIG. 11 and a perspective view for explanation of FIG. 12 (note that part numbers and symbols have been changed from the original drawings of the above publication) As shown in FIG. 5, the oil cooler 7 'is disposed between the oil filter 8' and the thermostat housing 10 'so that the oil cooler 7' is It is in the form of sticking out.

As a result, the space used around the engine becomes large, and depending on the engine, interference with other accessories and
There is a problem that the use space around the engine becomes large and it is difficult to arrange the engine in the engine room. In addition, since it is necessary to remove the oil filter 8 'at the same time when checking or replacing only the oil cooler 7', there is a problem that workability is deteriorated.

Further, in the case where a container whose use has been demanded in recent years is used as it is and an eco-filter in which only the filter element 8a 'can be replaced is used, it is necessary to divide the case of the filter cartridge into two parts. However, there is a problem that the number of connection points and the number of parts increase accordingly, and the efficiency of assembly and inspection work deteriorates. In the cooling water circulation structure of FIGS. 11 and 12, the heater core passage H passing through the heater core 6 and the cooler passage C passing through the oil cooler 7 ′ are independent, and both are located inside the thermostat housing 10 ′. Since they are joined and introduced downstream of the thermostat 9,
A passage between the cooling water pump 11 and the oil cooler 7 'and a pipe between the oil cooler 7' and the thermostat 9 are required, and there is still a problem that the number of pipes is large.

In addition, in the switching control between the radiator passage R and the bypass passage B, a radiator passage R is connected to one inlet of the two-valve thermostat 9 and a bypass passage is connected to the other inlet. B is connected, and the temperature of the cooling water is detected by the temperature sensing portion 9a located between the two inlets and facing the outlet. That is, one of the radiator passage R and the bypass passage B is selectively opened depending on the temperature of the cooling water around the temperature sensing portion 9a, and the cooling water is supplied from the outlet to the cooling water pump 11 side. By selecting one of the two passages R and B according to the cooling water temperature, the cooling amount of the cooling water by the radiator 5 is controlled so that the cooling water temperature falls within a predetermined range.

However, according to this control method, when the thermostat 9 selects and opens the radiator passage R, the cooling water passing through the radiator 5 and having a low temperature flows into the temperature sensing portion 9a. The cooling portion of the temperature sensing portion 9a is rapidly cooled by the cooling water, and in the wax type, the wax of the temperature sensing portion 9a contracts, and as a result, the bypass passage B
Will be selected and opened.

As soon as the bypass passage B is selected, the high-temperature cooling water directly returning from the uncooled cylinder head 2 flows into the temperature sensing portion 9a. The radiator is rapidly heated and expands, and the radiator passage R is selected again. This operation is repeated complicatedly, and there is a problem that hunting occurs. This hunting is caused by controlling with high and low temperature cooling water having a large temperature difference.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to improve a cooling water circulation passage and a thermostat housing to reduce the number of external pipes, to make the cooling water more compact, and to further cool the cooling water. An object of the present invention is to provide a thermostat housing in which no housing occurs in a thermostat that performs selective opening control of a water passage.

A further object is to provide a thermostat housing which enables the use of an eco-filter in which only the filter element can be replaced without increasing the number of parts and the number of connection points.

[0017]

SUMMARY OF THE INVENTION A thermostat housing for achieving the above object is a thermostat housing in which a cooling water thermostat for selectively opening a cooling water passage of an engine is provided. It has three flanges, a first flange for connecting to the engine body, a second flange for attaching an oil filter, and a third flange for attaching an oil cooler,
The three flange surfaces are arranged on different planes.

Alternatively, there is provided a thermostat housing in which a cooling water thermostat for selectively opening a cooling water passage of an engine is provided, wherein a first flange for connection to an engine body and an oil filter are provided. Two flanges and a third flange for attaching an oil cooler are provided, and the second flange and the third flange are arranged on the same plane different from the first flange.

The term "flange" as used herein is a generic term for a portion that joins a fluid passage between members. Joints between tubes forming tubes,
It includes a plane portion having a fluid passage and the like. According to this configuration, the first flange, the second flange, and the third flange are formed so as to be arranged on different planes from each other. Alternatively, the second flange and the third flange are separated from the first flange by the same plane. The oil filter and the oil cooler are attached to the thermostat housing without being laminated, so that a long laminated portion is eliminated, the amount of protrusion below the oil filter is reduced, and the engine becomes compact.

Further, since the oil filter and the oil cooler can be separately attached and detached, the work at the time of replacement and inspection can be performed efficiently. This allows
Since the oil filter and the oil cooler are arranged on each surface around the thermostat housing, the cooling water passage and the oil passage can be efficiently arranged, so that the entire area around the engine becomes compact.

Further, when the case portion for disposing the oil element of the oil filter inside the second flange is integrally formed, that is, a part of the oil filter is integrally formed with the second flange and incorporated into the thermostat housing. In addition, there is no need to connect the case part integrated with the oil filter, and the number of parts is reduced. Therefore, an eco-filter in which only the filter element can be replaced can be employed without increasing the number of parts.

The thermostat housing has a thermostat chamber for accommodating the two-valve thermostat, and a first opening which is opened and closed by a first valve body of the thermostat on one side of the thermostat chamber.
A second opening, which is opened and closed by a second valve body, is provided on the other side, and an outflow opening is provided on a side of the thermosensitive portion of the thermostat, and a passage from the radiator is connected to the thermostat housing. A first inflow port is provided to communicate with the first opening, and a second inflow port to which a bypass passage is connected is provided to communicate with the second opening. An outflow port to which a passage is connected is provided to communicate with the outflow opening, and further,
A third opening is provided in a portion of the thermostat chamber where the temperature sensing portion is located, a third inlet to which a cooling water outlet of the oil cooler is connected is provided in the third flange, and the third inlet is connected to the third inlet. It is configured to communicate with the third opening.

With this configuration, the temperature of the engine can be detected with relatively small temperature fluctuations from the third opening of the thermostat housing through the third opening of the third flange to the portion where the thermosensitive portion of the thermostat is located. Thus, the cooling water after passing through the heater core and the oil cooler is always supplied to the temperature sensing part. This alleviates a sudden change in the temperature of the cooling water that comes into contact with the temperature sensing portion, and prevents hunting when the thermostat passage is selected.

Further, a first oil inlet connected to a discharge port of an oil pump is provided in the first flange of the thermostat housing, and an opening is formed in the third flange so as to communicate with the first oil inlet. Forming a first oil outlet connected to the oil inlet passage of the oil cooler, and providing the second flange with a second oil inlet connected to the oil outlet of the oil filter; A second oil outlet is formed in communication with the second oil inlet and opened to the first flange to be connected to the oil inlet of the engine body.

According to this configuration, the oil cooler can be made compact as a whole by attaching the oil cooler to the third flange in contact with the oil filter.

[0026]

[Structure of thermostat housing]

[Overall structure] Thermostat housing 10 according to the present invention
As shown in FIGS. 1 to 10, the thermostat chamber is formed of a metal material having good thermal conductivity such as an aluminum alloy and the like, and a thermostat chamber of a hollow portion for disposing the thermostat 9, an internal passage around the thermostat chamber, and It is a housing formed with an entrance which is an opening of a passage.

A first flange F1 for connecting to the engine body 1, a second flange F2 for mounting an oil fill iter 8 for cleaning lubricating oil,
A third flange F3 for attaching an oil cooler 7 for cooling the oil is provided on the outer surface thereof. The first flange F1, the second flange F2, and the third flange F
3, the three flanges F1, F2,
F3 are arranged on different planes from each other. That is, any two flange surfaces are arranged at different positions where their extended surfaces intersect with each other so as not to be on the same plane.

Alternatively, the second flange F2 and the third flange F3 are arranged on the same plane different from the plane of the first flange F1, preferably adjacent to each other. [Cooling water passage] And as an internal passage for cooling water,
As shown in FIGS. 1 to 4, a thermostat chamber S for accommodating a two-valve thermostat 9 is provided, and a first flow communicating with a first opening R2 opened and closed by a first valve body 9a of the thermostat 9 is provided. A second inlet B communicating with an inlet R1 and a second opening B2 opened and closed by a second valve body of the thermostat 9;
1 and 2 are provided on the outer surface of the thermostat housing 10 so as to be open so that a pipe can be connected thereto. Further, the temperature sensing section 9a
The outflow opening T0 is provided on the side surface of the
Outlet T1 communicating with the thermostat housing 10
On the outer surface of the

Further, the temperature sensing part 9 of the thermostat 9
A third opening H2 is opened in a portion where a is located, and a third inlet H1 communicating with the third opening H2 is provided in the third flange F2 by opening. [Oil passage] As an internal passage for oil, FIG.
As shown in FIG. 4, the first oil inlet O1 provided in the first flange F1 and the first oil outlet O2 provided in the third flange F2 are connected by an internal passage, and further, the second flange F3
The second oil inlet O3 provided in the first flange F1 and the second oil outlet O4 provided in the first flange F1 are connected by an internal passage. [Circulation Path Around Engine Using Thermostat Housing] The cooling water circulation structure and oil circulation structure of the engine using the thermostat housing 10 are as shown in FIGS. 1 and 2, and will be described below. I do. [Configuration of cooling water circulation passage] First, the cooling water pump passage T is connected to the outlet T1 of the thermostat housing 10 to the suction port T2 of the cooling water pump (water pump) 11.
The cooling water that has flowed out of the discharge port P0 of the cooling water pump 11 enters the cylinder block 3 and the cylinder head 2, cools the engine body, and flows from the cooling water outlet T3 of the cylinder head 2 to the branch point.

The cooling water discharged from the cooling water outlet T3 is supplied to a radiator passage R passing through a radiator (R) 5 and a heater core (HC) for heating the vehicle interior.
Heater core passage H that enters oil cooler 7 via line 6
And a bypass path B for bypassing these devices. The radiator passage R is connected to the first inlet R1 of the thermostat housing 10 via the radiator 5, and is connected to the first inlet R1.
The first valve body portion 9a of the two-valve thermostat 9 having two valve bodies of a wax-type bottom bypass type and a side bypass type is disposed from the first through the internal passage of the thermostat housing 10 from the first. It is configured to enter the opening R2.

A bypass passage B bypassing the radiator 5 and the heater core 6 is connected directly from the branch point to the second inlet B1 of the thermostat housing 10, and is piped.
The cooling water is configured to enter the second opening B2 of the thermostat 9 through the internal passage of the thermostat housing 10 where the second valve body 9b is arranged. And FIG.
As shown in FIG. 2, the oil filter 8 is connected to the second flange F2 of the thermostat housing 10, and the oil cooler 7 is connected to the third flange F3 of the thermostat housing 10.

A passage H for the heater core passing through the heater core 6 is connected to a cooling water inlet H0 of the oil cooler 7 for piping, and a cooling water outlet of the oil cooler 7 is connected to the third inlet H1 of the thermostat housing 10. So that the cooling water passes through the internal passage of the thermostat housing 10 and enters the third opening H2 opened on the side surface (lower portion in the drawing) of the passage where the temperature sensing portion 9a of the thermostat 9 is located. Constitute.

The interior of the thermostat housing 10 is connected between an outlet opening T0 in which the flow paths from the three openings R2, B2 and H2 of the thermostat 9 are integrated into one and an outlet T1 to the cooling water pump 11. Connect by passage. This outflow port T1 is connected to the inflow port P1 of the cooling water pump 11, and the discharge port P0 of the cooling water pump 11 is connected to the cylinder block 3
To the cooling water inlet T2. This cooling water inlet T2 is connected to the cooling water outlet T3 of the cylinder head 2 by an internal cooling passage passing through the cylinder block 3 and the inside of the cylinder head 2.
It is configured to lead to.

That is, in the cooling water circulation passage, the cooling water is cooled from the cooling water pump 11 to the cylinder block 3 and the cylinder head 2 and then divided into three systems R, H, and B. The cooling water pump passes through the radiator 5, passes through the heater core 6 and the oil cooler 7 in the heater core passage H, or enters the thermostat housing 10 directly from the bypass passage B, and passes through the thermostat 9 again. Configured to circulate to eleven. [Structure of Oil Circulation Passage] Next, an engine lubrication oil circulation passage connects the outlet O0 of the oil pump 11 and the first oil inlet O1 of the thermostat housing 10, and the first oil inlet O1 Second connected by passage
The oil outlet O2 is connected to the oil inlet of the oil cooler 7, and the oil outlet O8 of the oil cooler 7 is connected to the oil inlet of the oil filter 8.

The outlet of the oil filter 8 is connected to the second oil inlet O3 of the thermostat housing 10, and the second oil outlet O4 communicating with the second oil inlet O3 through the internal passage is connected to the oil on the cylinder block 3 side. Connect to inlet O5. An oil outlet O6 from the cylinder block 3 and the oil pan 4 is connected to an inlet O7 of the oil pump 12.

The oil cooler 7 is a conventional water-cooled laminated or tubular type oil cooler. The oil filter 8 is also a filter paper obtained by folding a filter paper into a cylindrical shape, or the cover 8c is removed and the case 8b is left as it is. Leaving the filter element 8a
An eco-filter type that can be replaced only can be used. [Circulation of Cooling Water and Oil] With the above configuration of the cooling water circulation passage and the oil circulation passage around the engine, the cooling water is pressurized by the cooling water pump 11 and
After cooling the cylinder head 2, the gas passes through one of the radiator passage R and the bypass passage B and the passage passing from the heater core passage H through the oil cooler 7, and further into the thermostat housing 10. And returns to the cooling water pump 11 and circulates.

The engine oil is supplied to the oil pump 12
And then enters the oil cooler 7 via the passage in the thermostat housing 10 and is cooled by the cooling water passing through the heater core passage H, then enters the oil filter 8 and is filtered by the filter element 8a. After that, the oil enters the cylinder block 3, lubricates and cools each part of the engine, and is returned to the oil pan 4, from which it is sucked by the oil pump 12 and circulated. [Operation and Effect] Therefore, according to the structure of the thermostat housing 10 as described above, the first
Since the flange F1, the second flange F2, and the third flange F3 are formed independently of each other, the oil filter 8
The oil cooler 7 and the oil cooler 7 can be separately attached to the thermostat housing 10 without being laminated, and a long laminated portion can be eliminated. Oil filter 8
The oil cooler 7 and the oil cooler 7 can be individually attached and detached, so that work at the time of replacement and inspection can be performed efficiently.

Since any two flange surfaces of the first flange F1, the second flange F2, and the third flange F3 are arranged so that their extended surfaces intersect with each other.
The oil filter 8 and the oil cooler 7 can be arranged compactly around the thermostat housing 10, so that the cooling water passage and the oil passage can be arranged efficiently, and the engine can be made compact.

Further, by integrally molding the case portion 8b for disposing the oil element 8a of the oil filter 8 on the second flange F2, the joining between the case portion 8b and the thermostat housing 10 can be omitted, so that only the filter element 8a is provided. An eco-filter that can be replaced can be used without increasing the number of parts. That is, since the case portion 8b is formed integrally with the second flange F2 and is incorporated in the thermostat housing 10, the joining portion and parts can be omitted, and the filter element 8a can be replaced only by removing the lid portion 8c. Can be. By using the thermostat housing 10 described above, the cooling water passage is connected to the thermostat housing 10 from the third flange H3 through the third opening H2 provided on the side surface of the passage where the temperature sensing portion 9b of the thermostat 9 is located. Cooling water that has relatively little temperature fluctuation and easily detects the temperature of the engine and that has passed through the heater core 6 and the oil cooler 7 can be always introduced into the temperature sensing portion 9a.
That is, in addition to the low-temperature cooling water via the radiator 5 and the high-temperature cooling water via the bypass passage B, the oil cooler 7 has relatively small temperature fluctuation and is easy to detect the engine temperature.
The cooling water after passing can be always introduced into the temperature sensing portion 9a, and the two passages R and B can be selected.

As a result, a sudden change in the temperature of the cooling water in contact with the temperature sensing portion 9a is reduced, so that hunting when the passage of the thermostat 9 is selected can be prevented. When the thermostat housing 10 is used, the cooling water passages of the oil cooler 7 and the oil filter 8 are connected in series, and the cooling water cooled by heat exchange by the heater core 6 is supplied to the oil cooler 7 to supply the oil. Since cooling can be performed, the cooling performance of the oil cooler 7 can be improved.

As for the oil passage O, an internal passage communicating from the first flange F1 to the third flange F3 and an internal passage communicating from the second flange F2 to the first flange F1 are formed in the thermostat housing 10. The oil cooler 7 can be attached to the third flange F3 in contact with the oil filter 8, so that the overall structure can be made compact.

When the oil passes through a passage in the thermostat housing 10 made of an aluminum alloy having good heat conductivity, the oil can be cooled by cooling water passing through an adjacent passage in the thermostat housing 10 as well. , The load on the oil cooler 7 is reduced, and the size of the oil cooler 7 can be reduced.

[0043]

As described above, according to the thermostat housing of the present invention, according to this configuration, the first
Since the flange, the second flange, and the third flange are arranged on different planes from each other, or because the second flange and the third flange are arranged on the same plane different from the first flange, The oil filter and the oil cooler can be attached to the thermostat housing without being laminated, and a long laminated portion can be eliminated.

Therefore, the amount of protrusion below the oil filter can be reduced, and the engine can be made compact. At the same time, since the oil filter and the oil cooler can be separately attached and detached, the work at the time of replacement and inspection can be performed efficiently. Also, by integrally molding the case portion where the oil element of the oil filter is disposed on the second flange, the joining between the case portion and the thermostat housing can be omitted. Can be used without increasing the number of parts.

With respect to the cooling water passage, the thermostat housing has a relatively small temperature fluctuation from the third opening which is opened through the third inlet of the third flange to the portion where the thermosensitive part of the thermostat is located, Cooling water after passing through the oil cooler, which makes it easy to detect the temperature of the engine, can always be introduced into the temperature-sensitive part, so that sudden changes in the temperature of the cooling water that contacts the temperature-sensitive part can be mitigated and the thermostat passage can be selected. Hunting at the time can be prevented.

As for the oil passage, a passage from the discharge port of the oil pump to the oil inlet of the oil cooler is provided in the thermostat housing as an internal passage communicating from the first flange to the third flange. Since the passage from the outlet to the oil inlet of the engine body is provided as an internal passage communicating from the second flange to the first flange, the oil cooler attached to the third flange is arranged in contact with the oil filter attached to the second flange. And a compact configuration as a whole can be achieved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a cooling water and oil circulation system of a cooling water circulation structure of a thermostat housing and a periphery thereof according to an embodiment of the present invention.

FIG. 2 is a perspective view for describing a thermostat housing and a cooling water circulation structure around the thermostat housing according to the embodiment of the present invention.

FIG. 3 is an explanatory perspective view showing a cooling water passage and an oil passage in a thermostat housing according to the embodiment of the present invention.

FIG. 4 is an explanatory perspective view seen from another direction of FIG. 3;

FIG. 5 is a front view showing a first flange of the thermostat housing according to the embodiment of the present invention.

FIG. 6 is a left side view showing a third flange of FIG. 5;

FIG. 7 is a bottom view showing the second flange of FIG. 5;

FIG. 8 is a top view of FIG. 5;

FIG. 9 is a right side view of FIG. 5;

FIG. 10 is a rear view showing the oil filter of FIG. 5 in cross section.

FIG. 11 is a perspective view for explaining a prior art thermostat housing and a cooling water circulation structure around the thermostat housing.

FIG. 12 is a perspective view showing the structure and mounting of a prior art thermostat housing.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Engine 2 Cylinder head 3 Cylinder block 4 Oil pan 5 Radiator 6 Heater core 7, 7 'Oil cooler 8, 8' Oil filter 9 Thermostat 9a Temperature sensing part 10, 10 'Thermostat housing 11 Cooling water pump 12 Oil pump F1 First flange F2 Second flange F3 Third flange B Bypass passage H Heater core passage R Radiator passage T Cooling water pump passage O Oil passage

Claims (5)

[Claims] 1. A thermostat housing in which a cooling water thermostat for selectively opening a cooling water passage of an engine is provided. The thermostat housing includes a first flange for connection to an engine main body, and a first flange for mounting an oil filler. A thermostat housing having two flanges and a third flange for attaching an oil cooler, wherein the three flange surfaces are arranged on different planes. 2. A thermostat housing in which a cooling water thermostat for selectively opening a cooling water passage of an engine is provided. The thermostat housing includes a first flange for connection to an engine main body, and a first flange for mounting an oil filler. A thermostat housing having three flanges, two flanges and a third flange to which an oil cooler is attached, wherein the second flange and the third flange are arranged on the same plane different from the first flange. 3. The thermostat housing according to claim 1, wherein a case portion for internally disposing an oil element of an oil filter is formed on the second flange. 4. A thermostat housing for forming a thermostat chamber for accommodating the two-valve thermostat in the thermostat housing; a first opening which is opened and closed by a first valve body of the thermostat on one side of the thermostat chamber; A second opening, which is opened and closed by a second valve body, is provided on the other side, and an outflow opening is provided on a side of the thermosensitive portion of the thermostat. A passage from the radiator is connected to the thermostat housing. A first inflow port, which communicates with the first opening, and a second path to which a bypass passage is connected.
An inflow port is provided to communicate with the second opening, and further, an outflow port to which a passage to a cooling water pump is connected is provided to communicate with the outflow opening, and the thermostat chamber further comprises A third opening is provided in a portion where the temperature sensing portion is provided, a third inlet for connecting a cooling water outlet of the oil cooler is provided in the third flange, and the third inlet is connected to the third opening. The thermostat housing according to any one of claims 1 to 3, wherein the thermostat housing is connected to the housing. 5. A first flange connected to a discharge port of an oil pump on the first flange of the thermostat housing.
An oil inlet, which is formed in communication with the first oil inlet and opens to a third flange to form a first oil outlet connected to an oil inlet passage of the oil cooler; A second oil inlet connected to the oil outlet of the oil filter, the second oil inlet being formed to communicate with the second oil inlet, opening to the first flange, and being connected to the oil inlet of the engine body. The thermostat housing according to any one of claims 1 to 4, wherein an oil outlet is formed.