JPS58110808A - Thermostat for cooling water of engine - Google Patents

Abstract

PURPOSE:To decrease pressure for a valve body and reduce driving force by a method wherein a rotating shaft is rotated by the movement of a piston pushed out by the expansion of wax, a flowing path of cooling water is switched by the rotation of the valve body fixed on the shaft. CONSTITUTION:The movement of a piston is proceeded at the time an engine is cooled, when the temperature of cooling water detected by a temperature sensing unit 8 of a thermoelement 7 exceeds the predetermined temperature, while the wax filled within the element 7 is expanded, accordingly, the piston 21 is pushed up. Thereby, the rotating shaft 17 is risen, the thermoelement 7 is rotated against the guide lever 16 due to the pin 20 being engaged to the spiral groove 17b on the periphery of the shaft 17. Consequently, the valve body 6 is rotated with the element 7 being integrated, while the cooling water path 1 from the radiater is switched to the flowing path for communicating with the cooling water path 3 through the engine.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an engine cooling water thermostat for an automobile, which is arranged in the cooling water flow between a radiator outlet and an engine inlet. In the conventional well-known type of engine cooling water thermostat, poppet-shaped valves are attached to both ends of a wax-shaped element, and the main valve adjusts the amount of water flowing in from the two radiators, and the bypass valve adjusts the amount of water flowing in from the engine. , a mixed flow at a predetermined temperature is sent to the engine.

However, the engine cooling water thermostat having the above configuration has the following drawbacks.

1. Because the main valve that regulates the cooling water from the radiator receives water pressure in the sliding direction, the valve opening temperature or water temperature decreases at high engine speeds.

2. Since the element drives the main valve while receiving water pressure from the main valve, a large driving load is applied to the element, which deteriorates the durability of the element.

& Since the temperature-sensing part of the element is placed between the main valve and the bypass valve that regulates the cooling water from the engine, flow stagnation occurs in the temperature-sensing part, making it difficult to accurately control the mixed flow. Unable to sense temperature.

4. Since the main valve is placed in the vertical direction of the flow, water flow resistance is large.

5. Since the set temperature of the cooling water cannot be changed externally,
If you need different temperature settings for summer or winter, you will need to replace the thermostat.

Since the main valve cannot be forcibly opened from outside,
If a problem occurs in the drive of the element and overheating occurs, it is necessary to remove the thermostat.

Z When injecting cooling water when replacing cooling water, etc., since the amount of air vented is small (conventional thermostats are equipped with a jiggle valve for air venting), it takes time to inject cooling water.

The present invention has been made in view of the above points, and includes a wax-shaped element that drives a piston, a rotary shaft that rotates when the piston is pushed up, and a valve body that transmits rotation to the rotary shaft. By switching the cooling water flow path by rotating the valve body, the influence of water pressure on the drive of the valve body is small, and the load on the thermoelement that drives the valve body is reduced, improving the durability of the element. The temperature sensing part of the thermoelement can be provided at a position where it can be accurately sensed, and there is no resistance to water flow. As in the second invention, a guide lever is integrally provided on the rotating shaft that rotates the valve body, and a set temperature adjustment member that can be rotated from the outside is provided on the idle lever to change the valve opening temperature and coolant water. The purpose of the present invention is to provide an engine cooling water thermostat that enables switching of the set temperature of cooling water by switching the valve body regardless of temperature, and also enables opening of the valve in the event of overheating. That is.

The present invention will be described below with reference to embodiments shown in the drawings.

In Figures 1 to 7, 1 indicates the flow of cooling water from the radiator, 21 indicates the flow of cooling water from the engine, and 3 indicates the flow of a mixed flow of the above two cooling waters to the engine. Shows the flow back.

4L is the mounting housing for the rotary valve body, which will be described later.
It is made of metal such as aluminum, and a sealing member 5 made of rubber or Teflon is installed in the groove 4a, and a main shaft of a thermometer 7 is rotatably installed in the shaft hole 4b. Reference numeral 6 designates the valve body of the rotary valve, which is made of metal such as aluminum in resin and has a hole in the center, through which a wax-shaped thermometer 7 is inserted. Then, the cold water 2 from the engine is allowed to flow in through the hole 6c provided on the lower surface, and by having a flow path as shown in FIGS. 8 and 9, it is possible to mix the two types of cooling water. . ζ
The thermoelement 7 has a configuration as shown in FIG. 6, and its hexagonal portion 7a is fixed to the hexagonal hole 6& of the valve body 6 as shown in FIG. 7 so as not to rotate. Further, the mounting housing 4 and the valve body 6 are fitted together in a rotatable and slidable manner.

The state of the valve body 6 shown in FIG.
,b shows the valve open state. Reference numeral 8 denotes a temperature-sensing part of the thermometer 7, which is located inside the valve body 6. 9 is the housing for the thermoelement 7, which is made of metal such as aluminum, and has an O-ring groove 9a and an O-ring 10 for sealing.
is incorporated and fixed to the additional housing 4 with bolts, screws, etc. In addition, a hole 9b for guiding the thermoelement 7 is provided in the center of the housing 9 for the guide, and a hole 9b for guiding the thermoelement 7 is provided in the upper part 7b of the thermoelement 7 so as to be rotatably engaged. 0 ring groove 7 (
An IKO ring 11 is installed and seals the cooling water side and the drive mechanism side. An O-ring groove 9C is provided in the housing 9 for the i-type, and the O-ring 1 is installed in the groove 9C.
2 seals the drive mechanism side and the outside.

A male thread 9d is cut on the outer periphery, and a female thread of a rotation stopper screw 14 of a set temperature adjustment member 13, which will be described later, is fixed thereto. Reference numeral 16 is a lever that forcibly rotates the thermometer 7. The lever part 16a is made of metal such as Arun, and the lever part 16a is a plurality of grooves 131L, 1 provided in the set temperature adjustment member 13.
31) Non-rotatably fixed to 113c. Here, 1
3a is a groove that sets the valve opening temperature high (e.g. 88°O);
131) is set to a groove that sets the valve opening temperature low, for example, 82°C.
), 13o is a groove for forcibly opening the valve when the cooling water temperature is normal temperature (equal to the outside temperature). Here, the valve-opening temperature refers to the cooling water temperature when the cooling water 1 from the radiator and the mixed flow 3 to the engine are conducted. 13 is a set temperature adjustment member made of aluminum or the like, and the screw 13 provided inside
By rotating &, the idle lever 16 becomes integrated with this.
The valve opening temperature is finely adjusted by rotating the thermoelement 7 and the valve body 6, which rotate together with the guide lever 16. Also, a rotation stopper screw 14 made of aluminum or the like uses a washer 15 to stop the set temperature adjustment member 13 from rotating. 1T is a rotating shaft made of metal such as brass or stainless steel, and has a spiral groove 171) provided in the handle and a thermoelement 7 as shown in Fig.
Rotation is stopped by a pin 20 that engages with a single hole 7C provided in the hole 7C. When the piston 21 of the thermoelement T rises in accordance with the cooling water temperature and the rotating shaft 17 rises, the piston 20 slides along the helical groove 171), thereby causing the rotating shaft 17, the thermoelement 7 and The valve body 6, which rotates together with the thermoelement 7, rotates relatively. Here, since the rotary shaft 17 is stopped from rotating by the idle lever 16 via a spring receiver 19 which will be described later, when the rotary shaft 17 rises together with the piston 21, the thermoelement 7
And the valve body 6 will rotate. Reference numeral 18 is a cap for preventing the bottle 20 from being removed, and is made of resin or the like, and is fitted to the thermometer 7. 19 is a spring receiver made of brass, stainless steel, etc., with a square hole 19a in the center.
An end portion 19t of the cap 19 is provided and is engaged with the rotating shaft 170 so as not to rotate with the rectangular protrusion 17a.
A guide rod 1 provided vertically on the guide lever 16 at
6m) and the upper and lower slides are interlocked so that they can move freely and do not rotate. This state is shown in FIG. 5, which is a sectional view taken along line B--B in FIG. 22 company rotating shaft 1
This is a spring for pushing 7 back down.

Next, the transmission of the engine cooling water thermostat having the above configuration will be explained below. First, in FIG. 2, when the temperature of the cooling water 2 from the engine rises and the temperature of the temperature sensing part 8 of the thermoelement 7 exceeds the set temperature, the piston 21 rises and the rotating shaft 17 rises at the same time. As a result, the bottle 20 slides along the helical groove 171), but since the rotary shaft 17 is stopped from rotating by the guide lever 16 via the spring receiver 19, the thermoelement 7 is , rotates with respect to the idle lever 16, and together with the thermoelement 7, the rotary valve body 6 rotates to connect the cooling water channel 1 from the radiator to the cooling water channel 3 to the engine. Here, when the lever 16 & of the guide lever 16 is stopped at position M in Fig. 1, the set water temperature is set high (e.g. 88°C), and when it is stopped at position B, the set water temperature is set low (e.g. 82°C). Further, when the valve #-6 is stopped at the 0 position, valve #-6 is forcibly rotated even when the cooling water temperature is at room temperature, thereby making it possible to conduct the cooling water passage 1 from the radiator and the cooling water passage 3 to the engine. 8, which is a cross-sectional view taken along the Mu A line in Figure 2.
9 and 9 show the operation of the rotary valve body 6, and FIG.
In the state shown in the figure, the coolant temperature is high, and flow 1 from the radiator is conducted to flow 3 to the engine, while flow 2 from the engine is blocked. At this time, the flow 1 from the radiator and the flow 3 to the engine are connected straight, and water flow resistance can be minimized. In the state shown in Fig. 9, the cooling water temperature is lower than the set temperature, and the cooling water flows from the bottom of the page to the top, flowing from the engine 2 and flowing to the engine 3.
is conductive, and the flow 1 from the fugiator is completely interrupted by the sealing material 5.

In addition, in the above embodiment, the valve body was a rotary valve, but the first
As shown in Figures 0 to 12, the valve body is attached to the butterfly valve 2.
3, similar effects can be obtained. In these figures, 22 is a male seal member that is baked or fitted around the entire periphery of the butterfly valve 23. Bata 7
M) The valve body 23 is two plates 23 made of brass or stainless steel! L.

23b and sandwiched between them, it is fixed so that it does not rotate relative to the thermometer (7). The other configurations are the same as those of the above embodiment, except that the cooling water flow path for the valve body 23 is different.

As described above, in the present invention, as in the first invention, the engine cooling water thermostat includes a wax-shaped element that drives a piston, a rotating shaft that is rotated by the pushing up movement of the giston, and the rotating shaft. Since the valve body is equipped with a valve body that can be operated automatically to switch the cooling water flow path, the water pressure that the valve body receives can be reduced, the valve body is stable against changes in water pressure, and the engine cooling water temperature is This also prevents the thermoelement that drives the valve body from receiving water pressure.
The driving load on the thermoelement is reduced, improving the durability of the thermoelement, and by connecting the flow path from the radiator and the flow to the engine straight, water flow resistance can be reduced. There is an effect. Further, as in the second invention, the guide lever is integrally provided on the rotating shaft that rotates the valve body, and the guide lever is provided with a set temperature adjustment member that can be rotated from the outside, so that the valve body can be rotated from the outside. Since it is rotatable and the set temperature of the cooling water can be changed, the set temperature can be set low in the summer to improve overheating performance, and the temperature can be set low in the winter to improve overheating performance.
Can be set at a high temperature to improve heater performance.
This makes it difficult to replace the thermostat in summer and winter.
K becomes.

In addition, since the valve body can be manually and forcibly opened from the outside, the vehicle can be driven by opening the valve body when overheating occurs. Furthermore, since air can be easily vented by forcibly opening the valve body, the cooling water injection operation when replacing the cooling water can be easily performed in a short time.

As described above, the present invention has excellent effects.

[Brief explanation of the drawing]

1 to 9 show embodiments of the present invention, FIG. 1 is a partial plan view of an engine cooling water thermostat, FIG. 2 is a front sectional view of the engine cooling water thermostat, and FIG. 3 is an overall view of the thermostat. Fig. 4 is a side view in the X direction in Fig. 2, Fig. 5 is a side view of
t/Cf9 cross-sectional view. Fig. 6 is a perspective view of a wax-type thermoelement used in the engine cooling water thermostat shown in Fig. 2, Fig. 7 is a perspective view of a valve body, and Figs. FIG. 10H) and FIGS. 10B to 12 show other embodiments of the present invention, and FIG. 100) is a partial plan view of the engine cooling water thermostat. Figure 10 (B) is a front sectional view of the engine cooling water thermostat, and Figure 11 is Figure 10 (B).
FIG. 12 is a cross-sectional view along the Moum line in FIG. 10(b), and FIG. 12 is a side view in the X direction in FIG. DESCRIPTION OF SYMBOLS 1... Cooling water from the radiator, 2... Cooling water from the engine, 3... Mixed flow of cooling water flowing to the engine, 6... Valve body, T... Wax type thermoelement, 13 . . . Setting temperature adjustment member, 16 . . . idle lever, 1T . . . rotary shaft 7), 21 . . . piston. Representatives: Asamura and 4 people Figure 8 Figure 9 Figure 10 (a) Figure 10 (b) Figure 11 Figure 12

Claims (2)

[Claims] (1) A nine-engine cooling water thermostat installed between the two-engine outlet side and the engine inlet side includes a wax-shaped element that drives a piston by expansion of wax, and a wax-shaped element that drives a piston by the upward movement of the piston. It is equipped with a rotary shaft that is rotated, and a valve body that is rotated by a rotary shaft K, and when the valve body operates, the cooling water flow path from the engine outlet side to the engine inlet side is connected to the engine from the radiator outlet side. An engine cooling water thermostat characterized in that it can be switched to the inlet side. (2) In the engine cooling water thermostat installed between the radiator outlet side and the engine inlet side,
A wax-shaped element that drives a piston by expansion of wax, a rotating shaft that is rotated by the upward movement of the piston, and a valve body that is rotated by an armpit rotating shaft, and the rotating shaft has the same operation. A guide lever is provided, and a set temperature adjustment member is provided on the cough lever so that it can be rotated from the outside, and the valve body is rotated regardless of changes in the valve opening temperature and the cooling water temperature, and the cooling water flow path is controlled. An engine cooling water thermostat characterized in that the thermostat can be switched from the radiator outlet/outlet side to the engine inlet side.