WO2019245508A2

WO2019245508A2 - Thermostat assembly minimizing friction between valve and frame by providing balance of valve

Info

Publication number: WO2019245508A2
Application number: PCT/TR2019/050303
Authority: WO
Inventors: Faruk UNLUASLAN; Hikmet KANBUR; Ahmet KUTLU; Hasan NATUROGLU
Original assignee: Kirpart Otomotiv Parcalari Sanayi Ve Ticaret Anonim Sirketi
Priority date: 2018-05-14
Filing date: 2019-05-08
Publication date: 2019-12-26
Also published as: CZ2020618A3; WO2019245508A3; DE112019002478T5; CN112041547A; DE112019002478B4; IL277922A; HUP2000429A1

Abstract

This invention relates to a thermostat assembly (1) which minimizes the friction between outer surface of the valve structure (20) and the inner surface of the thermostat frame (10) by providing the balance in the valve motion, prevents the spring (15) element to be an undesired factor in pressure drop and response time of thermostat. Here, two springs (15) are located at the reciprocal positions formed between the valve structure (20) and the frame (10). So, these reciprocal springs (15) prevents the formation of the corrosion through the motion surfaces by allowing the valve structure (20) to move with balance throughout the thermostat interior space (10.1). Besides, present invention prevents spring (15) elements to be an obstacle against coolant flow throughout the thermostat interior space (10.1) by locating spring (15) elements outside of the coolant flow. Also, here, since there is no direct contact between spring (15) elements and the heat sensitive reservoir (31) portion, present invention provides short response time.

Description

THERMOSTAT ASSEMBLY MINIMIZING FRICTION BETWEEN VALVE AND FRAME BY

PROVIDING BALANCE OF VALVE

Technical Field

The invention relates a thermostat assembly which minimizing friction between the outer surface of the tube type valve and the inner surface of the frame, by providing balance in motion of valve.

Specifically, the present invention relates to a valve structure which moves within the housing of the frame with minimum friction and coolant leakage thanks to two return springs providing balance in motion of the valve structure throughout thermostat interior space.

Prior Art

In combustion engines, coolant temperature control is a crucial issue for maintaining vehicle performance. Coolant temperature control provides indirectly temperature control of the engine/engine parts within vehicle.

The coolant temperature control is provided by engine cooling system within vehicles. The most significant issue within engine cooling system is belong to the thermostat assembly which determines flow ratios between radiator outlet and bypass outlet according to temperature value of inlet coolant coming from engine outlet and vice versa (determines coolant flow ratios between radiator inlet and bypass inlet according to temperature value of outlet coolant going to engine inlet).

Sensing the temperature value of inlet coolant coming from engine outlet has a critical importance for determines engine conditions and cooling requirements. A wax-based thermo-actuator within thermostat assembly senses the inlet temperature value via its heat sensitive reservoir. When the inlet coolant temperature value is below than a first threshold value, inlet coolant coming from engine outlet continues to flow from inlet to bypass outlet throughout bypass circuitry comprising engine channels, water pump and thermostat assembly. At this temperature values below than the first threshold value, the thermo-actuator continues to be stay at fully closed position, consequently the valve structure too. At this fully closed position of the thermo-element, valve structure allows coolant flow from inlet to bypass outlet and prevents coolant flow from inlet to radiator outlet by closing just the radiator outlet passage window. When the inlet coolant temperature value is above than the first threshold value, wax material within mentioned heat sensitive reservoir starts to expand with increasing coolant temperature as a result of heat transmission between the coolant within thermostat interior space and wax within said reservoir. The expansion of wax material causes the piston guided by the actuator to move forward. However, forward motion restriction of piston end causes the thermo-actuator to move backward, consequently the valve structure too thanks to force applied on sleeve seat of valve structure by sleeve portion of the actuator. During backward motion of the valve structure, spring element wrapping the heat sensitive reservoir portion of the thermo-actuator is compressed. So, the spring stores potential energy. At this partially open position of the thermo element, valve structure allows coolant flow from inlet to both bypass outlet and radiator outlet. When the inlet coolant temperature value is equal or above than a second threshold value, opening of the thermo-element reaches its highest point (full backward motion), consequently valve structure too. At this fully open position of the thermo-element, valve structure allows coolant flow from inlet to radiator outlet and prevents coolant flow from inlet to bypass outlet by closing just the bypass outlet passage window. At this temperature values above than the second threshold, inlet coolant coming from engine outlet continues to flow from inlet to just radiator outlet throughout heat exchange circuitry comprising engine channels, radiator channels, water pump and thermostat assembly.

When the temperature value of the coolant coming from engine outlet decreases below the second threshold, piston starts to move backward. The stored potential energy by spring element is used to get the valve structure towards its first position (fully closed position).

The backward and forward motion of the tube type valve structure within thermostat interior space are possible thanks to the clearance between outer surface of valve structure and inner surface of thermostat body (frame). However, the clearance is reasonably small for preventing leakages occurred through the clearance. As a result of this, conventional thermostat assemblies having tube type valve structure has suffered from the corrosion occurred through the outer surface of valve structure and the inner surface of the thermostat body due to unbalanced motion of the valve structure within the thermostat interior space. Return spring causes the valve element to show unbalanced forward and backward motion through the thermostat interior space. Besides, since the spring is generally wrapped the heat sensitive reservoir portion of the thermo-actuator, it prevents full contact between the heat sensitive portion and coolant. This causes the heat transmission occurred between coolant and the wax compound within the heat sensitive reservoir to decrease. Consequently, response time of thermostat versus temperature change increases. Also, the spring wrapped around the heat sensitive reservoir portion of thermo-actuator shows a resistance against the coolant flow. So, the spring causes pressure drop to increase by forming an obstacle for the coolant that is passing through the thermostat interior space. The document US2013200167 A1 mentions a thermostat assembly comprising return spring wrapping heat sensitive reservoir portion of the actuator. So, the return spring causes unbalanced motion of valve structure. Besides, this return spring located on the coolant flow path causes undesired pressure drop, consequently decrease in efficiency of cooling system. Also, this return spring wrapping the heat sensitive portion the thermal element is an obstacle for heat transmission between wax compound within heat sensitive portion and coolant.

The document US7302919 B2 mentions a solution to prevent the coolant leakage occurred due to clearance between valve structure and thermostat body. Here, a conventional valve structure is used with a perforated layer to provide sealing between mentioned structures. However, this solution makes difficult the motion of the valve structure throughout thermostat interior space while it solves leakage problem. Besides, it is an expensive solution.

As a result, there is not any invention which minimizes the friction between outer surface of the valve structure and the inner surface of the thermostat body by providing the balance in the valve motion, prevents the spring element to be an undesired factor in pressure drop and response time of thermostat. So, the solution of the present invention is required.

Objectives and Short Description of the Invention

The aim of the present invention is to minimize the friction between outer surface of the valve structure and the inner surface of the thermostat body by providing the balance in the valve motion and, to prevent the spring element to be an undesired factor in pressure drop and response time of thermostat.

The present invention is a thermostat assembly which comprises a frame, a valve structure, an actuator, a frame closure, two springs elements that are located within two opposed spring nests.

A preferred embodiment of the present invention comprises a thermal actuator as an actuator.

Said opposed spring nests composed of

two frame-spring nests which lie vertically at the inner side surfaces of mentioned frame with equal interval to each other,

two associated frame-spring holders which locate as horizontal lower appendages of mentioned frame-spring nests, towards the internal space,

two valve-spring nests which lie vertically at the outer side surfaces of mentioned valve structure with equal interval to each other, two associated valve-spring seats which locate as horizontal upper appendages of mentioned valve-spring nests, towards the internal space.

Present thermostat assembly comprises

a bypass nest and a radiator nest which are formed on valve structure, two closures which are formed appropriate for dimension of mentioned bypass nest and radiator nest.

Present thermostat assembly comprises

a bypass o-ring nest portion which is formed on mentioned bypass nest, a radiator o-ring nest portion which is formed on mentioned radiator nest.

Present thermostat assembly comprises closure o-ring nest portions which are formed on the inner surface of the closures.

Description of the Figures

In figure 1 , a side cross-sectional view of the present thermostat assembly in fully closed position and, a close view of the clearance between the outer surface of the valve structure and the inner surface of the thermostat body are shown.

In figure 2a, a side cross-sectional view of the present thermostat frame including the valve structure in fully closed position is given.

In figure 2b, a side cross-sectional view of the present thermostat assembly in fully open position is given.

In figure 3, a front cross-sectional view of the present thermostat assembly in fully closed position and, a close view of the clearance between the outer surface of the valve structure and the inner surface of the thermostat body are shown.

In figure 4, a front cross-sectional view of the present thermostat assembly in fully open position is given.

In figure 5, an exploded perspective view of the present thermostat assembly is shown.

In figure 6, a front cross-sectional view of a second embodiment of the present thermostat assembly is shown. Here, thermo-actuator is in fully closed position so, there is coolant flow from inlet to just bypass outlet throughout bypass circuitry. At this fully closed position, O-ring element located below the radiator outlet window on the valve surface provides sealing around the radiator outlet passage window.

In figure 7, a front cross-sectional view of mentioned second embodiment of the present thermostat assembly is shown. Here, thermo-actuator is in fully open position so, there is coolant flow from inlet to just radiator outlet throughout heat exchange circuitry. At this fully open position, O-ring element located above the bypass outlet window on the valve surface provides sealing around the bypass outlet passage window. In this figure, also, a close view of the portion between present valve structure and the thermostat body is given. Here, it is possible to see how the O-ring element prevents leakages by compensating mentioned clearance.

In figure 8, a side cross-sectional view of said second embodiment of the present thermostat assembly is given. As seen this figure, two spring elements are also used for this embodiment of the present invention.

In figure 9, an exploded perspective view of the second embodiment of the present thermostat assembly is shown.

In figure 10, conventional thermostat assembly having single spring which wraps the heat sensitive reservoir portion of the actuator is shown.

Reference Numerals

I . Thermostat assembly

10. Frame

10.1. Thermostat interior space

I I . Inlet

12. Bypass outlet

12.1. Bypass outlet passage wi ndow

13. Radiator outlet

13.1 Radiator outlet passage window

14. Frame-spring nest

14.1. Frame-spring holder

15. Spring

20. Valve structure

21. Valve-inlet

22. Valve-bypass outlet window 23. Valve-radiator outlet window

24. Bypass nest

24.1. Bypass o-ring nest

25. Radiator nest

25.1. Radiator o-ring nest

26. O-ring

27. Closure

27.1. Closure o-ring nest

28. Sleeve seat

29. Valve-spring nest

29.1. Valve-spring seat

30. Thermo-actuator

31. Heat sensitive reservoir

32. Piston

33. Sleeve

40. Frame closure

41. Piston seat

50. Clearance

Detailed Description of the Invention

This invention relates to a thermostat assembly (1) which minimizes the friction between outer surface of the valve structure (20) and the inner surface of the thermostat frame (10) by providing the balance in the valve motion, prevents the spring (15) element to be an undesired factor in pressure drop and response time of thermostat.

Engine cooling systems aim to keep engine in an appropriate temperature range of work during cruising. Engine efficiency of a vehicle is directly related to the cooling ability of vehicle’s cooling system. It is crucial to remove the excess heat accumulated on engine and engine parts. The most important issue in cooling system belongs to the thermostat assembly (1) that determines cooling require of the engine according to temperature value of the engine coolant coming from engine channels to inlet (11). Temperature value of the coming coolant is sensed by heat sensitive reservoir (31) portion of thermo-actuator (30) located within the thermostat interior space (10.1).

The thermostat assemblies (1) requires a clearance (50) at micron scale (acceptable amount of leakage) between outer surface of the valve structure (20) and inner surface of the frame (10) for allowing valve structure (20) to be guided by thermo-actuator (30) throughout thermostat interior space (10.1), although that this clearance (50) is not preferred for sealing performance therefor. Conventional thermostat assemblies including single spring element wrapping the heat sensitive portion of the thermo-actuator suffer from corrosion formed through inner surface of frame due to unbalanced motion of the valve structure throughout thermostat interior space. Corrosion means that the clearance gets bigger. So, the amount of the leakage starts to exceed the acceptable level. Besides, at this type conventional thermostat assemblies, heat transmission between coolant coming from inlet and the wax compound located within the heat sensitive reservoir is partially obstructed by the spring wrapping the reservoir. This causes the response time of the thermostat assembly to increase and consequently, cooling performance of the thermostat assembly to decrease. Also, the spring element located at center of the valve element obstructs flow of the coolant. This causes increasement in the pressure drop of coolant passing through the thermostat interior space and consequently decrease in the efficiency of the cooling system.

The present thermostat assembly (1) comprises a frame (10) including inlet (1 1), bypass outlet (12), radiator outlet (13), two frame-spring nests (14) and associated frame-spring holders (14.1), a valve structure (20) including valve-inlet (21), valve-bypass outlet window (22), valve-radiator outlet window (23), sleeve seat (28), two valve-spring nests (29) and associated valve-spring seats (29.1), two springs (15) which are located within the spring nests that are formed between mentioned frame spring nests (14) and valve-spring nests, an actuator, a frame closure (40) including piston seat (41) portion.

Here, it is possible to use different type actuator such as electrically activated actuator, thermal actuator, wax-based thermal actuator etc. A preferred embodiment of the present invention comprises a thermo-actuator (30) as mentioned actuator. Mentioned thermo-actuator (30) includes heat sensitive reservoir (31), piston (32) and sleeve (33) portions.

For preventing mentioned problems about single spring usage, mentioned two springs (15) are located at the reciprocal positions formed between the valve structure (20) and the frame (10). So, these reciprocal springs (15) prevents the formation of the corrosion through the motion surfaces by allowing the valve structure (20) to move with balance throughout the thermostat interior space (10.1).

As shown in figure 2a, frame (10) has two frame-spring nests (14) vertically lying at its inner side surfaces with equal interval to each other and, associated frame-spring holders (14.1) located as horizontal lower appendages towards the internal space. Valve structure (20) has two valve-spring nests (29) vertically lying at its outer side surfaces with equal interval to each other and, associated valve-spring seat (29.1) located as horizontal upper appendages towards the internal space. Each frame-spring nest (14) coincides one valve-spring nest (29). Consequently, frame-spring nest (14), associated frame-spring holder (14.1), valve-spring nest (29) and associated valve-spring seat (29.1) form together the spring nest. In the preferred embodiment of the present invention, each spring nest is formed at the middle of the path between bypass outlet (12) and radiator outlet (13) as being opposed to each other.

A side cross-sectional view of the present thermostat assembly (1) in fully closed position is given in figure 1. In this figure it is possible to see mentioned opposing spring nests and reciprocal springs (15) located thereof. Besides, the close view shows the clearance (50) between inner side surface of frame (10) and outer side surface of the valve-spring seat (29.1). The clearance (50) permits the forward and backward motion of the valve structure (20) throughout the thermostat interior space (10.1) .

Valve structure (20) within the frame (10) without other components of thermostat assembly (1) is shown in figure 2a. This thermostat position belongs to the fully closed thermostat position which allows the coolant to flow just throughout the bypass circuitry. As seen from this figure, in this fully closed thermostat position, the bypass outlet passage window (12.1) on the side surface of the frame (10) and the valve-bypass outlet window (22) on the side surface of the valve structure (20) coincide. It is possible to see the coincidence between the bypass outlet passage window (12.1) and the valve- bypass outlet window (22) in the front cross-sectional view which belongs to fully closed thermostat position given in figure 3. As seen from the figure 3, at the fully closed thermostat position, the radiator outlet passage window (13.1) on the side surface of the frame (10) and the valve-radiator outlet window (23) on the side surface of the valve structure (20) do not coincide. Thus, during the temperature of the coolant incoming from the engine outlet via the inlet (11) is below the first threshold value, the incoming coolant flows from the inlet (11) to just bypass outlet (12).

A side cross-sectional view of the present thermostat assembly (1) in fully open position is given in figure 2b. This fully open thermostat position allows the coolant to flow just throughout the heat exchange circuitry. As seen from this figure, in this fully open thermostat position, the bypass outlet passage window (12.1) on the side surface of the frame (10) and the valve-bypass outlet window (22) on the side surface of the valve structure (20) do not coincide. As seen from the front cross- sectional view which belongs to fully open thermostat position given in figure 4, at the fully open thermostat position, the radiator outlet passage window (13.1) on the side surface of the frame (10) and the valve-radiator outlet window (23) on the side surface of the valve structure (20) coincide. Thus, during the temperature of the coolant incoming from the engine outlet via the inlet (1 1) is equal or above the second threshold value, the incoming coolant flows from the inlet (1 1) to just radiator outlet (13). Reciprocal springs (15) inserted within the opposed spring nests are compressed during position change of the valve structure (20) from fully closed to fully open. Thus, the reciprocal springs (15) store potential energy. During position change of the valve structure (20) from fully open to fully closed, the potential energy stored by springs (15) is used to move the valve structure (20) towards its fully closed position by pushing it from under the valve-spring seat (29.1).

A view of conventional thermostat assemblies having just one spring wrapping the heat sensitive reservoir portion is shown in figure 10. Unlike the conventional thermostat assemblies having just one spring wrapping the heat sensitive reservoir portion, present invention provides balance in the motion of the valve structure (20) by using two reciprocal springs inserted the opposed spring nests. Thus, the balanced valve motion provided by the present invention prevents contacts between the inner side surface of the frame (10) and outer side surface of the valve structure (20) by saving mentioned clearance (50) thereof during valve motion. Consequently, present invention provides the amount of leakages to be within the acceptable limit by preventing the corrosion formation (increasement in the size of clearance) throughout the motion surfaces. Besides, unlike the conventional thermostat assemblies having just one spring wrapping the heat sensitive reservoir portion, present invention prevents spring (15) elements to be an obstacle against coolant flow throughout the thermostat interior space (10.1) by locating springs (15) outside of the coolant flow. So, the reciprocal springs (15) located outside of the valve structure (20) do not become an undesired factor in pressure drop and efficiency of the cooling system. Also, unlike the conventional thermostat assemblies having just one spring wrapping the heat sensitive reservoir portion, present invention prevents spring (15) elements to be an obstacle against heat transfer between the wax compound within the heat sensitive reservoir (31) of the thermo-actuator (30) and the incoming coolant from engine outlet via inlet (11). Since there is no direct contact between spring (15) elements and the heat sensitive reservoir (31) portion, present invention provides short response time (consequently high cooling performance) unlike conventional thermostat assemblies having direct contact between spring and heat sensitive reservoir. An exploded perspective of the first embodiment of the present thermostat assembly is given in figure 5.

An exploded perspective view of a second embodiment of the present invention is shown in figure 9. Mentioned second embodiment of the present thermostat assembly (1) comprising a valve structure (20) which provides sealing bypass outlet passage window (12.1) and radiator outlet passage window (13.1) by compensating clearance (50) between outer surface of valve structure (20) and inner surface of frame (10) thanks to its portions exhibiting spring properties versus bypass outlet passage window (12.1) and radiator outlet passage window (13.1) during respectively fully open position of thermo-actuator (30) and fully closed position of thermo-actuator (30). Thus, it becomes possible to provide both clearance (50) and sealing together.

Mentioned second embodiment of the present thermostat assembly (1) comprises a frame (10) including inlet (11), bypass outlet (12), radiator outlet (13) and frame-spring nest (14) portions, two springs (15), a valve structure (20) including valve-inlet (21), valve-bypass outlet window (22), valve- radiator outlet window (23), bypass nest (24), bypass o-ring nest (24.1), radiator nest (25), radiator o-ring nest (25.1), sleeve seat (28) and valve-spring nests (29) portions, two o-rings (26), two closures (27) including closure o-ring nest (27.1) portion, a thermo-actuator (30) including heat sensitive reservoir (31), piston (32) and sleeve (33) portions, a frame closure (40) including piston seat (41) portion.

Second embodiment of the present thermostat assembly (1) provides proper temperature control within the engine cooling system by allowing heat sensitive reservoir (31) of thermo-actuator (30) to sense real temperature of engine coolant by preventing leakages occurred between valve structure (20) and frame (10) thanks to its portions exhibiting spring properties versus bypass outlet passage window (12.1) and radiator outlet passage window (13.1) during respectively fully open position of thermo-actuator (30) and fully closed position of thermo-actuator (30).

Valve structure (20) of the second embodiment of the present invention comprises a bypass nest (24), a bypass o-ring nest (24.1), a radiator nest (25), a radiator o-ring nest (25.1), two o-rings (26), two closures (27) including a closure o-ring nest (27.1) as well as a valve-inlet (21), a valve-bypass outlet window (22), a valve-radiator outlet window (23), a sleeve seat (28) and two valve-spring nests (29). Mentioned bypass nest (24) is formed just above the valve-bypass outlet window (22) while mentioned radiator nest (25) is formed just below the valve-radiator outlet window (23). The location of these nests is adjusted according to sealing require of thermostat assembly (1) for both fully closed position and fully open position. T o provide convenient housing for mentioned o-rings (26), mentioned bypass o-ring nest (24.1) and radiator o-ring nest (25.1) are formed respectively within said bypass nest (24) and radiator nest (25). In the same way, mentioned closures (27) which are produced within convenient forms for the bypass nest (24) and radiator o-ring nest (25), have closure o-ring nests (27.1) formed on as coinciding said bypass o-ring nest (24.1) and radiator o-ring nest (25.1). Said o- rings (26) are inserted within said bypass o-ring nest (24.1) and radiator o-ring nest (25.1). Then, said closures (27) are inserted on them as closing the bypass nest (24) and radiator nest (25).

Similarly, valve structure (20) of the second embodiment of the present invention also has mentioned sleeve seat (28) on its top portion for the thermo-actuator’s (30) sleeve (33) portion to sit on. Thanks to said sleeve seat (28) form, the valve structure (20) could be guided with backward motion of thermo-actuator’s (30) heat sensitive reservoir (31) while thermostat assembly (1) changes position from fully closed to fully open. Thus, backward motion of the thermo-actuator (30) allows backward motion of valve structure (20) too. Vice versa, springs (15) inserted on mentioned valve-spring nests (29) allows the valve structure (20) to come back its original position while thermostat assembly (1) changes position from fully open to fully closed.

At the second embodiment of the present invention, the clearance (50) between valve structure’s (20) outer surface and frame’s (10) inner surface is eliminated at the bypass outlet passage window (12.1) thanks to spring-featured portion which is formed by inserting an o-ring (26) between bypass o-ring nest (24.1) on the bypass nest (24) and closure o-ring nest (27.1) on the closure (27). Thus, at fully open thermostat position, the clearance (50) is eliminated at just bypass outlet passage window (12.1) to prevent coolant leakages occurred from thermostat interior space to bypass outlet (12). In figure 7, it is possible to see how the clearance (50) at bypass outlet passage window (12.1) is eliminated by mentioned spring-featured portion and the clearance (50) between other portions of valve structure (20) and frame (10) is still allowed for the motion of the valve structure (20).

At fully closed position of the second embodiment of the present thermostat assembly (1), as seen this figure 6, the clearance (50) between valve structure’s (20) outer surface and frame’s (10) inner surface is eliminated at the radiator outlet passage window (13.1) thanks to spring-featured portion which is formed by inserting an o-ring (26) between radiator o-ring nest (25.1) on the radiator nest (25) and closure o-ring nest (27.1) on the closure (27). Thus, at fully closed thermostat position, the clearance (50) is eliminated at just radiator outlet passage window (13.1) to prevent coolant leakages from thermostat interior space to radiator outlet (13).

In figure 8, a side cross-sectional view of the second embodiment of the present thermostat assembly (1) is given. The cross-sectional view corresponds to fully closed position of the thermo-actuator (30) consequently, to fully closed position of the present thermostat assembly (1). As seen this figure, there is coolant flow from inlet (11) to just bypass outlet (12). Here, the clearance (50) between valve structure’s (20) outer surface and frame’s (10) inner surface is eliminated at the radiator outlet passage window (13.1) thanks to spring-featured portion which is formed by inserting an o-ring (26) between radiator o-ring nest (25.1) on the radiator nest (25) and closure o-ring nest (27.1) on the closure (27). Thus, at fully closed thermostat position, the clearance (50) is eliminated at just radiator outlet passage window (13.1) to prevent coolant leakages from thermostat interior space to radiator outlet (13).

In figure 9, exploded perspective view of the second embodiment of the present thermostat assembly (1) is given. Firstly, o-rings (26) are inserted on both bypass o-ring nest (24.1) and radiator o-ring nest (25.1) then, the closures (27) are inserted on them. After mounting operation of valve structure (20), valve structure (20) is inserted within interior space of frame (10) by locking springs (15) within interior space formed between frame (10) and valve structure (20). Then, thermo-actuator (30) is inserted on top portion of valve structure (20) as locating the sleeve (33) portion of thermo-actuator (30) on sleeve seat (28) formed on valve structure (20). Lastly, mentioned frame closure (40) comprising a piston seat (41) is mounted to frame (10) by holding other components within thermostat interior space. Piston (32) end is within mentioned piston seat (41) in complete assembly form of the present thermostat assembly (1). Since said piston seat (41) prevents forward motion of said piston (32), it causes heat sensitive reservoir (31) portion of the thermo-actuator (30) to move backward, consequently valve structure (20) to move backward while thermo-actuator (30) changes position from fully closed to fully open.

Claims

1. A thermostat assembly (1), comprising;

a frame (10),

a valve structure (20),

an actuator,

a frame closure (40),

characterized in that it comprises

two springs (15) elements which are located within two opposed spring nests.

2. A thermostat assembly (10) according to the claim 1 , characterized in that said opposed spring nests composed of

two frame-spring nests (14) which lie vertically at the inner side surfaces of mentioned frame (10) with equal interval to each other,

two associated frame-spring holders (14.1) which locate as horizontal lower appendages of mentioned frame-spring nests (14), towards the internal space, two valve-spring nests (29) which lie vertically at the outer side surfaces of mentioned valve structure (20) with equal interval to each other,

two associated valve-spring seats (29.1) which locate as horizontal upper appendages of mentioned valve-spring nests (29), towards the internal space.

3. A thermostat assembly (10) according to the preceding claims, characterized in that it comprises

a bypass nest (24) and a radiator nest (25) which are formed on valve structure (20), two closures (27) which are formed appropriate for dimension of mentioned bypass nest (24) and radiator nest (25).

4. A thermostat assembly (10) according to the claim 3, characterized in that it comprises

a bypass o-ring nest (24.1) portion which is formed on mentioned bypass nest (24), a radiator o-ring nest (25.1) portion which is formed on mentioned radiator nest (25).

5. A thermostat assembly (10) according to the claim 4, characterized in that it comprises

closure o-ring nest (27.1 ) portions which are formed on the inner surface of the closures (27).

6. A thermostat assembly (10) according to the claims 3 to 5, characterized in that it comprises two o-rings (26) which are inserted on mentioned bypass o-ring nest (24.1) and radiator o-ring nest (25.1) and, then closed by mentioned closures (27) as locating within mentioned closure o-ring nests (27.1).

7. A thermostat assembly (1) according to the preceding claims, characterized by comprising a thermo-actuator (30) as an actuator.