JP2932348B2 - thermostat - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling water passage for an internal combustion engine or the like, that is, a passage between an engine and a radiator. The present invention relates to an improvement of a thermostat that opens and closes the passage by bringing a valve body into and out of contact with a valve seat.

[0002]

2. Description of the Related Art FIG. 12 shows an example of use of a conventional general thermostat. Reference numeral 1 denotes a cylinder block, and a water jacket 2 through which cooling water passes is provided around each cylinder. 3 is a radiator that cools the cooling water by air
The radiator 3 and the water jacket 2 are connected by cooling water passages 4 ₁ , 4 ₂ , and a return port 2 a of the water jacket 2 from which the cooling water returns from the radiator 3 to the water jacket 2. A water pump 5 is provided in the vicinity, and by driving the water pump 5, the cooling water is supplied to the water pump 5.
Circulate between jacket 2 and radiator 3.

[0003] Bypass cooling water channel 4 ₃ is provided between the cooling water channel 4 _1, 4 _2, the water jacket 2
Outlet of cooling water (inlet of cooling water of radiator 3)
In the passage between the engine side and the radiator side, a thermostat TS for flowing / cutting off the cooling water is provided.

[0004] Since the conventional thermostat TS provided in the cooling water passage opens as opposed to the flow of the cooling water, the pressure of the cooling water (steam pressure + discharge pressure of the water pump) opens and closes the valve. If the temperature of the cooling water reaches the set temperature of the thermostat, the valve will not open and will be delayed, and when the temperature of the coolant exceeds the set temperature, the overshoot phenomenon will occur. Wake up. Then, since the cooling water cooled on the radiator side flows through the water channel at once, the temperature of the cooling water drops too much, and this causes an undershoot phenomenon in which the cooling water is closed at a time below the thermostat closing temperature. Temperature hunting, which is a repetition of such overshoot and undershoot, occurs.

[0005] If the temperature hunting continues, the temperature of the cooling water becomes unstable, causing the following problem. That is, since cooling water having an unstable temperature enters the water jacket 2 of the engine, the temperature of the engine, that is, the engine block, the cylinder block, and the like is not uniform, so that the durability of the engine is lowered and the fuel efficiency is deteriorated. . In addition, it becomes difficult to control the temperature of the air conditioner,
Gives discomfort to the driver. In addition, since the water temperature monitor also monitors this unstable water temperature, the pointer of the water temperature meter is not stable,
The driver may be anxious.

As described above, a thermostat in which a large amount of cooling water cooled immediately after the valve opening of the thermostat is prevented from flowing at once, the initial flow rate is suppressed, and the temperature hunting as described above is reduced is conventionally shown in FIG. There is a vertical two-stage thermostat TS 'as shown. In this figure, T
H is a thermoelement constituting the thermostat TS ', 6 is a case, 7 is a thermal expansion body (wax) made of a mixture of paraffin and copper powder contained in the case 6 and thermally expanded / contracted, and 8 is a thermal expansion body. A diaphragm 9 made of nitrile rubber or the like for sealing the expansion body 7 in the case 6 is a guide cylinder connected to the opening of the case 6 through the diaphragm 8. In order from the diaphragm 8 side, a fluid 10, a rubber piston 11 made of nitrile rubber or the like, a backup plate 12 made of polytetrafluoroethylene (PTFE) or the like, and a moving member (piston) ) 13 are arranged to form a thermoelement TH.

Reference numeral 14 denotes a valve seat body. The top of the moving member 13 is brought into contact with a support member 15 provided on the top by being urged by a spring described later, and a flange 14 of the valve seat body 14 is provided.
a is a seal projection 1 on the upper surface, the lower surface and the outer peripheral surface in the figure.
The elastic ring 17 is fixed to the inner periphery 17a of the elastic ring 17 formed with 6 ₁ , 16 ₂ , and 16 _3. The elastic ring 17 is fitted to a housing or the like in a passage between the water jacket and the radiator to form the thermostat TS. 'Can be attached.

Reference numeral 14b denotes a valve seat formed in the vicinity of the flange 14a of the valve seat body 14, and 18 denotes a valve body whose inner periphery is slidably supported by a guide cylinder 9 constituting the thermoelement TH. The outer peripheral portion 18a comes into contact with and separates from the valve seat 14b. A plurality of flow holes 18b are formed in the vicinity of the inner periphery of the valve element 18, and a lower end portion 18c of the outer peripheral portion of the flow hole 18b is in contact with the front end portion 6a of the case 6 when the valve is closed.

Reference numeral 19 denotes a rigid pressing plate which is a second valve body. The inner peripheral portion 19a of the pressing plate is opposed to a flat surface 18d (upper surface in the figure) of the valve body 18 at a predetermined interval. A peripheral portion 19b is fixed to the guide cylinder 9 that constitutes the thermoelement TH, and has an outer peripheral portion 19a and an inner peripheral portion 19a.
A flow hole 19d is formed between the flow passage 19b and b.

Reference numeral 20 denotes a first spring contracted between the pressing plate 19 and the valve element 18, and 21 is fixed to a lower side of the valve element 18 and the flange 14a of the valve seat body 14 in the drawing. A second spring 22a contracted between the frame 22 and the frame 22 is a guide hole formed in a lower portion of the frame 22 in the drawing, and the case 6 forming the thermoelement TH slides with the guide hole 22a. It is movably supported.

Reference numeral 23 denotes a support shaft connected to the lower end of the case 6 constituting the thermoelement TH in the drawing.
A third valve element 25 is slidably supported upward by a stopper 24 at the tip of the support shaft 23 in the figure.
A third spring 26 is contracted between the third valve body 25 and the case 6 constituting the thermoelement TH, and the third spring 26 elastically cools the third valve body 25. It comes into contact with a valve seat 27 such as a housing provided in the water bypass flow path.

Since the vertical two-stage thermostat TS 'is constructed as described above, when the water temperature rises, first, as shown in FIG. 14A, a thermal expansion element constituting the thermoelement TH is formed. 7 is thermally expanded,
Although the moving member 13 is about to protrude, since the moving member 13 is in contact with the support member 15, the thermo-element TH as a whole moves downward in FIG. The pressed plate 19 also moves downward, and the distal end 6a of the case 6 connected to the guide cylinder 9 moves away from the lower end 18c of the valve body 18 in the drawing. A circulation hole 18b drilled in the periphery and a circulation hole 19d drilled in the push plate 19
First, a small amount of cooling water flows as shown by the arrow a.

When the temperature of the cooling water further rises, as shown in FIG. 14B, the thermal expansion member 7 constituting the thermoelement TH further expands thermally, and the moving member 13 moves from the guide cylinder 9 to the outside. The guide cylinder 9 and the case 6 further move downward in the figure so as to protrude further,
The outer peripheral portion 19a of the push plate 19 fixed to the guide cylinder 9 pushes the flat surface 18d of the valve body 18 downward, the outer peripheral portion 18a of the valve body 18 separates from the valve seat 14b, and the cooling water flows in the direction of arrow b.
The valve seat 14b and the outer peripheral portion 18a of the valve body 18
And flows also as shown by the arrow a.

As described above, when the temperature of the cooling water rises, first, a small amount of the cooling water is caused to flow to the radiator 3. Therefore, immediately after the thermostat is opened, a large amount of the cooled water flows at once. Since the temperature hunting is prevented and the initial flow rate is suppressed, the above-described temperature hunting does not occur.

As another thermostat having reduced temperature hunting as described above, there is a thermostat with a sub-valve as shown in a plan view of FIG. 15 and a sectional view of FIG. In these drawings, the same components as those of the vertical two-stage thermostat are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0016] TS ₁ the main thermostat comprising a main valve, TH ₁ is a thermo-element that constitutes the main thermostat, which is substantially the same structure as the conventional general. The main thermostat TS ₁ is incorporated at a position offset in one direction from the center of the disk-shaped valve seat body 14 (right side position in the figure).

TS ₂ is a sub-thermostat which serves as a sub-valve, and TH ₂ is a thermo-element which constitutes this sub-thermostat, and is incorporated at a position (left side in the figure) offset from the center of the disc-shaped valve seat body 14 to the other side. Have been. The thermo-element TH ₂ is substantially the same structure as the conventional general. The differences from the sub-valve TS ₂ is a main thermostat TS ₁ is described below.

The thermo-element TH ₂ constituting the sub-valve TS ₂ is held by a holding member 28 at a position where the tip of the moving member 13 is deviated from the center of the valve seat body 14 to the other side. In the figure, the upper portion 9a of the guide cylinder 9 has a small diameter and the lower portion 9b has a large diameter. A flow passage 29 is formed between the small diameter upper portion 9a and the holding member 28, and a large diameter lower portion 9a. Thermoelement TH so that the portion 9b abuts on the valve seat 30 communicating with the flow passage 29 to close the valve.
₂ is held by a spring plate 31 so as to be pushed upward in the figure.

Since the thermostat with a sub-valve is constructed as described above, when the water temperature rises, first, as shown in FIG.
_When the thermal expansion body 7 of the thermo-element TH2 constituting the _second thermal expansion body 7 thermally expands, the moving member 13 attempts to protrude. However, since the moving member 13 is held by the holding member 28, the moving member 13 is left as it is. entire thermo-element TH ₂ is moved downward in the figure, the guide cylinder 9 moves downward in the figure, the lower portion 9b of the large-diameter away from the valve seat 30. Then, the cooling water flows through the flow passage 29 as shown by the arrow a.

Further, when the temperature of the cooling water rises, FIG.
As shown in the (B), as the thermal expansion body 7 constituting the thermo-element TH ₁ is thermally expanded, the moving member 13 projects from the guide cylinder 9, the thermo-element TH
_{1 as a} whole moves downward in FIG.
Is moved downward in the figure against the spring 21 to separate from the valve seat 14b, and the cooling water passes between the valve seat 14b and the valve body 18 as shown by the arrow b. While flowing, it also flows as indicated by the arrow a.

[0021] Thus, the temperature of the cooling water is increased, firstly, since the sub-valve TS ₂ as described above is to flow a small amount of cooling water is opened to the radiator 3, chilled immediately after opening of the thermostat A large amount of cooling water is prevented from flowing at once, and the initial flow rate is suppressed, so that the above-described temperature hunting does not occur.

[0022]

The vertical two-stage thermostat shown in FIG. 13 or the thermostat with a sub-valve shown in FIGS. 15 and 16 has an advantage that the above-mentioned temperature hunting can be eliminated. Both the vertical two-stage thermostat and the thermostat with sub-valve have a large number of parts and assembling man-hours, have a complicated structure, and are difficult to manufacture, resulting in high costs, poor maintenance, and a slight increase in the temperature compared to a single-valve thermostat. There were problems such as becoming heavy.

An object of the present invention is to provide a thermostat which eliminates the above-mentioned temperature hunting by slightly changing the structure of a valve body which is a component of a conventional thermostat.

[0024]

A first thermostat (described in claim 1) according to the present invention, as shown in FIG. 1, FIG. 2 and FIG. A thermostat provided in a cooling water passage for opening and closing the cooling water passage, the valve being fixed to a moving member 13 of a thermoelement TH which operates by sensing a cooling water temperature.
A valve seat 14b formed on the valve seat main body 14 having a flange 14a for attaching a thermostat to the cooling water passage and a support portion 14c with which the distal end of the moving member 13 abuts, and the valve body 18 coming and going. , The valve seat 14b
Has the valve body 18 toward or away from a substantially horizontal valve seat portion 14b ₁ and the substantially vertical valve seat portion 14b _2, the valve body 18 is formed in a side face convex separable in the horizontal valve seat portion 14b ₁ has a substantially horizontal valve body portion 18e, and a substantially vertical valve body portion 18f for contact and separation in the vertical valve seat portion 14b _2, one of the ring-shaped lip 18g formed on the vertical valve body portion 18f of this A thermostat is characterized in that cooling water passages 18h are formed at several places of the ring-shaped lip 18g in a direction substantially orthogonal to the ring-shaped lip 18g.

As shown in FIGS. 4 and 5, a second thermostat according to the present invention is provided in a cooling water passage of an internal combustion engine or the like and opens and closes the cooling water passage. And the valve element 1 fixed to the moving member 13 of the thermoelement TH which operates by sensing the temperature of the cooling water.
8 and a valve seat 14b formed on a valve seat body 14 having a flange 14a for attaching a thermostat to the cooling water passage and a support portion 14c with which the distal end of the moving member 13 abuts, and the valve body 18 coming and going. The valve seat 14
b has the valve body 18 toward or away from a substantially horizontal valve seat portion 14b ₁ and the substantially vertical valve seat portion 14b _2, the valve body 18 is formed in a side surface convex against the horizontal valve seat portion 14b ₁ separating from a substantially horizontal valve body portion 18e, and a substantially vertical valve body portion 18f for contact and separation in the vertical valve seat portion 14b _2, and the vertical valve body two ring-shaped lip 18 g ₁ formed in 18f, 18 g ₂ the a, in several places of the two ring-shaped lip 18 g _1, 18 g _2, two ring-shaped lip 18 g _1, 18 g ₂ a cooling water passage 18h ₁ in a direction substantially orthogonal, in that the formation of the 18h ₂ It is a thermostat that is a feature.

As shown in FIGS. 7, 8 and 9, the third thermostat of the present invention (described in claim 3)
A thermostat that is provided in a cooling water passage of an internal combustion engine or the like and opens and closes the cooling water passage. The valve body 18 fixed to the moving member 13 of the thermoelement TH that operates by sensing the temperature of the cooling water, and the thermostat is cooled. A valve seat 14b is formed on the valve seat main body 14 having a flange 14a attached to a water system and a support portion 14c with which the distal end of the moving member 13 abuts, and the valve seat 18 comes in contact with and separates from the valve body 18. the valve body 18 has a toward or away from a substantially horizontal valve seat portion 14b ₁ and the substantially vertical valve seat portion 14b _2, the valve body 1
8, a substantially horizontal valve body 18e which is formed on the side face convex toward or away in the horizontal valve seat portion 14b _1, the vertical valve seat portion 14b
₂ and two ring-shaped lips 18g ₁ , 18 formed on the vertical valve body 18f.
and a g _2, the horizontal valve body portion to the first several places of the ring-shaped lip 18 g ₁ 18e side, small coolant passage 18h ₁ aperture in a direction substantially perpendicular to the ring-shaped lip 18 g ₁ of the first forming a, in several places of the vertical valve body second upper end side of 18f ring lip 18 g _2, a large cooling water passage 18h ₂ of the second ring lip 18 g ₂ and the direction to the opening substantially perpendicular This is a thermostat characterized by being formed.

According to a fourth thermostat of the present invention, the cooling water passage is gradually narrowed from the upper end of the valve element 18 toward the horizontal valve body portion 18e. The thermostat according to any one of claims 1 to 3, wherein the thermostat is formed by such an opening groove.

[0028]

[0029]

According to a fifth thermostat of the present invention, the thermo-element TH includes a case 6 in which a thermal expansion body 7 that thermally expands / contracts due to a change in the temperature of cooling water.
And a movable member 13 that slides on the guide cylinder 9 connected to the case 6 by thermal expansion / contraction of the thermal expansion body 7, and the distal end of the movable member 13 is connected to the valve seat body 14. The valve body 18 fixed to the guide cylinder 9 that is supported by the top portion 14c ′ of the support portion 14c and moves in reaction to follow the sliding of the moving member 13, 5. The device according to claim 1, wherein the valve seat is operated so as to come into contact with and separate from the valve seat.
The thermostat according to any one of the above.

[0031]

[0032]

[0033]

The first, fourth, and fifth thermostats of the present invention are configured as described above (see FIGS. 1, 2, and 3) to increase the temperature of the cooling water.
The thermal expansion body 7 thermally expands, and the moving member 13 attempts to protrude from the guide cylinder 9. The tip of the moving member 13 abuts on the top 14 c ′ of the support portion 14 c of the valve seat body 14. Therefore, the entire thermoelement TH moves downward in the drawing while the moving member 13 remains as it is, and the valve element 18 fixed to the guide cylinder 9 also moves downward,
Horizontal valve body 18e of the valve body 18 moves away from the horizontal valve seat 14b ₁ of the valve seat 14b.

However, the ring-shaped lip 18g formed on the vertical valve body portion 18f is still in contact with the vertical valve seat portion 14b.
_2, but through a cooling water passage 18h formed in a direction substantially orthogonal to the ring-shaped lip 18g.
The cooling water flows a little as shown by the arrow a in FIG.

Furthermore, the temperature of the cooling water is increased, since the distance from the vertical valve seat 14b ₂ of the ring-shaped lips formed in the vertical valve body 18f 18 g also the valve seat 14b, the cooling water is shown in FIG. 3 (B) Flows a lot as indicated by the arrow b in FIG.

Also, the second, third, fourth,
And the fifth thermostat (see FIG. 4, FIG. 5, FIG. 7, FIG. 8, and FIG. 9) increases the temperature of the cooling water by the above-described configuration, so that the thermal expansion body 7 thermally expands. The moving member 13 attempts to protrude from the guide cylinder 9, but since the tip of the moving member 13 is in contact with the top portion 14c 'of the support portion 14c of the valve seat body 14, the moving member 13 As it is, the entire thermoelement TH moves downward in the figure, and the valve element 18 fixed to the guide cylinder 9 also moves downward, so that the horizontal valve element 1 of the valve element 18 is moved.
8e is separated from the horizontal valve seat 14b ₁ of the valve seat 14b.

[0037] The first ring-shaped lip 18 g ₁ formed on the vertical valve body 18f is still the vertical valve seat portion 14b
_2, but this first ring-shaped lip 18
g ₁ and cooling water passages 18h ₁ formed in a direction substantially perpendicular
, The cooling water flows a little as shown by the arrow in FIG.

Further, when the temperature of the cooling water rises, the first ring-shaped lip 1 formed on the vertical valve body portion 18f is formed.
8 g ₁ but moves away from the vertical valve seat portion 14b _2, yet,
The second ring-shaped lip 18 g ₂ is the vertical valve seat portion 14b
₂ this ring-shaped lip 18g
₂ and through the cooling water passage 18h ₂ formed in a direction substantially orthogonal, the cooling water flows more than or before, as indicated by the arrows in FIG. 4 (C).

When the temperature of the cooling water further rises, the second
Since also the ring-shaped lip 18 g ₂ away from the vertical valve seat portion 14b _2, the cooling water flows as much indicated by arrows in (D) in FIG. 4.

[0040]

[0041]

[0042]

[0043]

[0044]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a thermostat according to the present invention will be described below in detail with reference to the accompanying drawings, in which the same reference numerals are given to the same parts as those of the conventional vertical two-stage thermostat.
FIG. 1 is a sectional view of the thermostat in a closed state, FIG. 2 is an enlarged view of a valve body and a valve seat in a closed state, and FIG. 3 is an explanatory view of the operation of the thermostat.

The difference between the thermostat of the present invention and the conventional example will be described in detail. As shown in detail in FIG. 2, the valve seat body 14 constituting the thermostat TS
Formed valve seat 14b has a nearly horizontal valve seat portion 14b ₁ and the substantially vertical valve seat portion 14b _2, the toward and away from the valve element 18 to the valve seat 14b is formed on the side face convex, said generally horizontal valve a substantially horizontal disk portion 18e for contact and separation in the seat 14b _1, substantially vertical valve body 18f toward or away the substantially vertical valve seat portion 14b ₂
And one ring-shaped lip 18g formed on the substantially vertical valve body portion 18f. The upper end of the valve body 18 is provided at several places of the ring-shaped lip 18g in a direction substantially orthogonal to the ring-shaped lip 18g. The difference from the conventional example is that the cooling water passage 18h is formed by a V-shaped opening groove in which the cooling water passage gradually narrows from the side toward the horizontal valve element 18e.

Since the cooling water passage 18h has the valve element 18 formed as described above, when the temperature of the cooling water rises, first, as shown in FIG. 3A, the thermoelement TH is formed. When the thermal expansion body 7 thermally expands, the moving member 13 attempts to protrude. However, since the tip of the moving member 13 is in contact with the top portion 14c 'of the support portion 14c of the valve seat body 14, With the moving member 13 as it is, the entire thermoelement TH moves downward in the figure, and the valve element 18 fixed to the guide cylinder 9 constituting the thermoelement TH also moves downward in the figure, and this valve The horizontal valve body portion 18e of the body 18 is
Away from the horizontal valve seat 14b _1.

However, the ring-shaped lip 18g formed on the vertical valve body portion 18f is still in contact with the vertical valve seat portion 14b.
_Although not separated from ₂ , the cooling water slightly flows through a cooling water passage 18h (see FIG. 2) formed in a direction orthogonal to the ring-shaped lip 18g as shown by an arrow a in the figure.

Further, when the temperature of the cooling water rises, as shown in FIG. 3B, the valve element 18 fixed to the guide cylinder 9 further moves downward, and the vertical valve element portion 18f
Because away from the vertical valve seat 14b ₂ the ring-shaped lip 18g also the valve seat 14b formed in the same way as conventionally thermostat, the cooling water flows more as shown by an arrow b.

FIG. 4 is a view for explaining the main part of the second thermostat of the present invention, that is, the structure and operation of the valve seat and the valve element. The second thermostat is provided on the valve seat body 14 formed on the valve seat body 14. 14b has the valve body 18 toward or away from a substantially horizontal valve seat portion 14b ₁ and the substantially vertical valve seat portion 14b _2,
The valve element 18 is formed in a side convex shape and the horizontal valve seat 1 is formed.
A generally horizontal disk portion 18e for contact and separation to 4b _1, a substantially vertical valve body portion 18f for contact and separation in the vertical valve seat portion 14b _2, 2 pieces of ring-shaped lip 18 formed in this vertical valve body 18f
g ₁ , 18 g _2, and these two ring-shaped lips 1
At _two places of 8g ₁ and 18g ₂ , two ring-shaped lips 1
The cooling water passage 18 extends in a direction substantially orthogonal to 8 g ₁ and 18 g _2.
It is obtained by forming a h _1, 18h _2.

When the temperature of the cooling water is low as shown in FIG. 4 (A), the operation of the second thermostat is such that the substantially horizontal valve body 18e is moved to the substantially horizontal valve seat 14b. _The valve is in the closed state in contact with ₁ .

The temperature of the cooling water rises, the thermal expansion body 7 thermally expands, and the moving member 13 attempts to protrude from the guide cylinder 9.
Because it is in contact with the top 14c 'of the support portion 14c,
The moving member 13 is kept as it is, and the thermoelement TH
The whole body moves downward, and the valve body 18 fixed to the guide cylinder 9 also moves downward, so that the substantially horizontal valve body portion 1 of the valve body 18 is moved.
8e is separated from the horizontal valve seat 14b ₁ of the valve seat 14b (see FIG. 4 (B)).

[0052] The first ring-shaped lip 18 g ₁ formed on the vertical valve body 18f is still the vertical valve seat portion 14b
_2, but this first ring-shaped lip 18
g ₁ and cooling water passages 18h ₁ formed in a direction substantially perpendicular
, The cooling water flows a little as shown by the arrow in FIG.

[0053] Further, when the temperature of the cooling water rises, the forming the vertical valve body 18f, the first is the ring-shaped lip 18 g ₁ moves away from the vertical valve seat portion 14b _2, still, the second ring The lip 18g ₂ is connected to the vertical valve seat 1
Although not far from 4b _2, the cooling water passage 18 formed in a direction substantially perpendicular to the second ring lip 18 g ₂
through h _2, the cooling water flows more than or before, as indicated by the arrows in FIG. 4 (C).

When the temperature of the cooling water further rises, the second
Since also the ring-shaped lip 18 g ₂ away from the vertical valve seat portion 14b _2, the cooling water flows more as shown by the arrows in (D) in FIG. 4.

FIG. 5 shows the valve element 18 in detail. The two ring-shaped lips 18g ₁ and 18g ₂ formed on the substantially vertical valve element portion 18f of the valve element 18 are provided at several places. of the ring-shaped lip 18g _1, 18g ₂ a cooling water passage 18h ₁ in a direction substantially orthogonal, 18h ₂ are formed. That is, the first several places of the ring-shaped lip 18 g _1, in a direction substantially perpendicular to the ring-shaped lip 18 g ₁ of the first, gradually cooling water passage toward the upper end of the valve body 18 to the horizontal valve body 18e is formed a small opening groove so becomes narrower, the cooling water passage 18h ₁ is formed. The second ring-shaped lip 1g is provided at several positions on the _second ring-shaped lip 18g2 on the upper end side of the vertical valve body 18f.
In a direction substantially perpendicular to 8 g _2, it is composed cooling water passage 18h ₂ with large opening groove is formed to gradually cooling water passage toward the horizontal valve body 18e is narrowed from the upper end side of the valve body 18 I have. Further, the cooling water passages 18h ₁ , 18h
Small opening groove and a large open groove to form a h ₂ is V-shaped, is inclined to the groove bottom b _1, b ₂ in the vertical direction. By forming the cooling water passages 18h ₁ and 18h ₂ as described above, the two ring-shaped lips 18g are formed.
_1, the flow rate at the required flow rate gradient in accordance with 18 g ₂ is spaced apart from the vertical valve seat portion 14b ₂ is to increase.

FIG. 6 shows a flow characteristic X of the conventional thermostat, a flow characteristic Y of the thermostat of the present invention having one ring lip 18g on the valve body 18, and two ring lips 18g ₁ , 18g on the valve body 18. ₂ shows the flow rate characteristic Z of the thermostat of the present invention having ₂ ; the horizontal axis indicates the amount of separation of the valve body from the valve seat, and the vertical axis indicates the flow rate.

In the case of the flow characteristic X of the conventional thermostat, the flow rate increases from the beginning with a constant flow gradient in proportion to the amount of separation of the valve body from the valve seat. In the case of the flow characteristic Y of the thermostat of the present invention having one ring-shaped lip 18g on the valve body 18 and the cooling water passage 18h in the ring-shaped lip 18g, the ring-shaped lip 18g formed on the vertical valve body portion 18f during the up away from the vertical valve seat 14b ₂ (Y _1), the ring-shaped lip flow rate of the cooling water flowing through the cooling water passage 18h formed in 18g is small, ring-shaped lip 18g vertical valve seat 14b ₂ (Y ₂ ), the flow rate increases in proportion to the amount of separation of the valve body from the valve seat. The flow rate gradient (Y ₁ ) of the cooling water flowing through the cooling water passage 18h can be changed to a desired flow rate by changing the size of the V-shaped opening groove forming the cooling water passage 18h and changing the inclination of the groove bottom. It can be designed for flow gradient.

The two ring-shaped lips 18g ₁ and 18g ₂ in the vertical valve body 18f and the cooling water passages 18h ₁ and 18g ₂ in the ring-shaped lips 18g ₁ and 18g ₂ respectively.
In the case of the flow characteristic Z of the thermostat of the present invention having 18 h ₂ , the flow rate is small until the first ring-shaped lip 18 g ₁ separates from the vertical valve seat portion 14 b ₂ (Z ₁ ), and the second flow rate is small. The ring-shaped lip 18g ₂ is the vertical valve seat 14
During the interval (Z ₂ ) until it is separated from b ₂ , the flow rate is larger than that in the section (Z ₁ ), and the second ring-shaped lip 18 g
When ₂ moves away from the vertical valve seat 14b ₂ (Z _3), the flow rate is further increased.

FIGS. 7A and 7B, FIG. 8A and FIG.
9 (B) and FIGS. 9 (A) and 9 (B) show the case where 2
Shows another embodiment of the thermostat of the present invention, each number of the ring-shaped lip 18g _1, 18g _2, and these ring-like lip 18 g _1, 18 g ₂ having a cooling water passage 18h _1, 18h _2, respectively (A 3) is a plan view of the valve element 18 as viewed from below, and FIG. 2 (B) is a side view of a portion of the cooling water passage. The valve element 18 is formed to have a convex side surface and the horizontal valve seat 14b _1. a generally horizontal disk portion 18e for contact and separation to a substantially vertical valve body portion 18f for contact and separation in the vertical valve seat portion 14b _2, 2 pieces of ring-shaped lip 18 g _1, 18 g formed in the vertical valve body 18f ₂ and a first ring-shaped lip 18g ₁ on the side of the horizontal valve body portion 18e.
In several places, the first ring lip 18 g ₁₎ and direction to form small cooling water passage 18h ₁ aperture that is substantially perpendicular, the vertical valve body upper side of the second ring lip 18 g ₂ of 18f in several places, it is obtained by forming a large cooling water passage 18h ₂ direction to the opening of which is substantially perpendicular to the ring-shaped lip 18 g ₂ of the second. The size and shape of the opening a small cooling water passage 18h ₁ and large cooling water passages 18h ₂ opening shown in the figures, the design change, such as changing the angle of inclination of the groove bottom of the opening groove, shown in FIG. 6 It is possible to change the flow characteristics such as the flow rate and the flow rate gradient of (Z ₁ ) and (Z ₂ ) as desired.

FIG. 10 shows a main part of still another embodiment of the thermostat of the present invention.
Separable, the valve element 18 has a toward or away from a substantially horizontal valve seat portion 14b ₁ and the substantially vertical valve seat portion 14b _2, the valve body 18 is formed in a side surface convex to the horizontal valve seat portion 14b ₁ predetermined gap G and a substantially horizontal disk portion 18e, the vertical valve seat portion 14b ₂ of
And a thermostat having a substantially vertical valve body portion 18f opposed thereto.

With this configuration, when the temperature of the cooling water rises, the entire thermoelement TH moves downward as shown in the figure, and the valve element 18 fixed to the guide cylinder 9 also moves downward as described above. to the horizontal valve body 18e of the valve body 18 moves away from the horizontal valve seat 14b ₁ of the valve seat 14b.
Since the vertical valve body portion 18f in the vertical valve seat portion 14b ₂ are opposed with a predetermined gap G, the cooling water flows slightly through the predetermined gap.

[0062] In addition, increases the temperature of the cooling water, the whole thermo-element TH moves further downward, the vertical valve body portion 18f so completely separated from the vertical valve seat 14b _2, the cooling water and the conventional ordinary thermostat Flows a lot as well.

FIG. 11A is a plan view of a thermostat according to another embodiment of the present invention as viewed from above, and FIG. 11B is an enlarged sectional view taken along line XX of FIG. The valve seat 14b is a substantially horizontal valve seat portion 1 with which the valve element 18 comes and goes.
And has a 4b ₁ substantially perpendicular valve seat portion 14b _2, which said several locations of the vertical valve seat portion 14b ₂ or the entire circumference to form a vertical valve seat portion 14b ₃ larger diameter than the vertical valve seat portion 14b ₂ It is.

With this configuration, when the temperature of the cooling water rises, the valve element 18 moves downward as described above, and the horizontal valve body 18e of the valve 18 is moved to the horizontal valve seat of the valve seat 14b. 14b Leave ₁ The vertical valve seat 14
cooling water through the gap between the formed in b ₂ a vertical valve seat portion 14b ₃ larger diameter than the vertical valve seat 14b ₂ and the vertical valve body portion 18f flows a little.

Further, the temperature of the cooling water rises and the valve body 18
When There further moved downward, the vertical valve body portion 18f so completely separated from the vertical valve seat 14b _2, the cooling water flows just as much as the conventional ordinary thermostat.

As described above, when the temperature of the cooling water rises, the valve is first opened so that a small amount of the cooling water flows to the radiator, and when the temperature of the cooling water further rises, a large amount of the cooling water flows to the radiator. In other words, a large amount of cooling water cooled immediately after the thermostat is opened is prevented from flowing at once, and the initial flow rate is suppressed, so that the above-described temperature hunting does not occur.

[0067]

According to the present invention, since the thermostat described above is used, the temperature of the cooling water rises as in a conventional vertical two-stage thermostat or a thermostat with a sub-valve simply by improving the valve body. First, a small amount of cooling water was allowed to flow to the radiator, which prevented a large amount of cooled water from flowing immediately after the thermostat valve was opened, and suppressed the initial flow rate, which could cause temperature hunting. Disappears.

Further, the position, shape and number of the ring-shaped lips formed on the vertical valve body constituting the valve body, and the number and size of the cooling water passages provided on the ring-shaped lip can be changed. Therefore, since optimal flow control can be performed and various flow characteristics can be obtained, it is possible to provide a thermostat that can support various types of vehicles.

Further, since the valve body is merely improved, the number of parts and the number of assembling steps are smaller and the structure is simpler than a vertical two-stage thermostat or a thermostat with a sub-valve which is constructed so as not to cause the temperature hunting. Therefore, it is possible to provide a thermostat which is easy to manufacture, has low cost, has good maintainability, and can achieve the intended purpose at almost the same cost as the conventional single valve thermostat.

[Brief description of the drawings]

FIG. 1 is a sectional view of a thermostat according to the present invention in a valve closed state.

FIG. 2 is an enlarged view of a valve seat and a valve body of the thermostat according to the present invention in a closed state.

FIG. 3 is a diagram illustrating the operation of the thermostat of the present invention.

FIG. 4 is a view for explaining the structure and operation of a valve seat and a valve element of a main part of a thermostat according to another invention.

FIG. 5 is a detailed view of a structure of a valve body of a thermostat according to another invention.

FIG. 6 is a diagram showing a comparison between flow characteristics of a thermostat of the present invention and a conventional thermostat.

FIG. 7 is a view showing an embodiment of a thermostat according to another invention.

FIG. 8 is a view showing another embodiment of the thermostat of the other invention.

FIG. 9 is a view showing still another embodiment of the thermostat of the present invention.

FIG. 10 is a view showing a main part of a thermostat according to still another invention.

FIG. 11 is a view showing a thermostat according to still another embodiment of the present invention.

FIG. 12 is a diagram showing a usage example of a conventional general thermostat.

FIG. 13 is a sectional view of a conventional vertical two-stage thermostat in a valve closed state.

FIG. 14 is an operation explanatory view of a conventional vertical two-stage thermostat.

FIG. 15 is a plan view of a conventional thermostat with a sub-valve.

FIG. 16 is a sectional view of a conventional thermostat with a sub-valve in a closed state.

FIG. 17 is an operation explanatory view of a conventional thermostat with a sub-valve.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Cylinder block 2 Water jacket 2a Return port 3 Radiator 4 ₁ Cooling channel 4 ₂ Cooling channel 4 ₃ Bypass cooling channel 5 Water pump TS thermostat TS 'Vertical two-stage thermostat TS ₁ Main thermostat TS ₂ Sub-valve TH Thermoelement TH ₁ Thermo element TH ₂ Thermo element 6 Case 6a Tip 7 Thermal expansion body 8 Diaphragm 9 Guide cylinder 10 Fluid 11 Rubber piston 12 Backup plate 13 Moving member 14 Valve seat body 14a Flange 14b Valve seat 14b ₁ Horizontal valve seat 14b ₂ Vertical valve seat portion 14b ₃ Vertical valve seat portion 14c having a larger diameter than vertical valve seat portion 14b ₂ Support portion 14c 'Top portion 15 Support member 16 ₁ Seal protrusion 16 ₂ Seal protrusion 16 ₃ Seal protrusion 17 Elastic ring 17a Inner circumference 18 Valve body 18a Outer peripheral part 18b Flow hole 18c Lower end part 18d Flat surface 18e Horizontal valve body part 18f Vertical valve body part 18g Ring-shaped lip 18g ₁ First ring-shaped lip 18g ₂ Second ring-shaped lip 18h Cooling water passage 18h _1st 1 cooling water passage 18h ₂ second cooling water passage 19 push plate 19a outer peripheral portion 19b inner peripheral portion 19d flow hole 20 first spring 21 second spring 22 frame 22a guide hole 23 support shaft 24 stopper 25 third Valve body 26 Third spring 27 Valve seat 28 Holding member 29 Flow passage 30 Valve seat 31 Spring plate G Gap

Continued on the front page (72) Inventor Akira Mori 6-59-2 Nakazato, Kiyose-shi, Tokyo Inside Thermostat Co., Ltd. (72) Inventor Takashi Masuko 6-59-2 Nakazato, Kiyose-shi, Tokyo Inside Thermostat Co., Ltd. (56 References: Japanese Utility Model 60-1920 (JP, U) Japanese Utility Model 55-168771 (JP, U) Japanese Utility Model 44-26377 (JP, Y1) (58) Fields investigated (Int. Cl. ⁶ , DB Name) F16K 31/68 F01P 7/16 502 F16K 1/00-1/54

Claims (5)

(57) [Claims] 1. A thermostat provided in a cooling water passage of an internal combustion engine or the like and opening and closing the cooling water passage, the thermostat being fixed to a moving member (13) of a thermoelement ( TH ) which operates by sensing a cooling water temperature. Valve (18) and thermostat
(14a) for attaching the
And the supporting portion (1) with which the tip of the moving member (13) abuts.
4c) formed in a valve seat body (14),
(18) becomes more and valve seat approaching and moving away from (14b), the valve seat (14b) the valve body (18) toward or away from a substantially horizontal valve seat portion (14b ₁₎ and substantially perpendicular valve seat portion (14b ₂ )
The valve element (18) has a substantially horizontal valve element part (1) formed in a convex shape on the side and coming into contact with and separating from the horizontal valve seat part (14b ₁ ).
8e), a substantially vertical valve body (18f) which comes into contact with and separates from the vertical valve seat (14b ₂ ), and one ring-shaped lip (18g) formed on the vertical valve body (18f). The cooling water passage (18h) is provided at several places of the ring-shaped lip (18g) in a direction substantially orthogonal to the ring-shaped lip (18g).
A thermostat, characterized in that a thermostat is formed. 2. A thermostat provided in a cooling water system passage of an internal combustion engine or the like, for opening and closing the cooling water system passage, and is fixed to a moving member (13) of a thermoelement ( TH ) which operates by sensing a cooling water temperature. Valve (18) and thermostat
(14a) for attaching the
And the supporting portion (1) with which the tip of the moving member (13) abuts.
4c) formed in a valve seat body (14),
(18) becomes more and valve seat approaching and moving away from (14b), the valve seat (14b) the valve body (18) toward or away from a substantially horizontal valve seat portion (14b ₁₎ and substantially perpendicular valve seat portion (14b ₂ )
The valve element (18) has a substantially horizontal valve element part (1) formed in a convex shape on the side and coming into contact with and separating from the horizontal valve seat part (14b ₁ ).
And 8e), a substantially vertical valve body toward or away in the vertical valve seat portion (14b ₂₎ and (18f), 2 pieces of ring-shaped lip which is formed in the vertical valve body _{(18f) (18g 1, 18g} 2 )
And these two ring-shaped lips (18 g ₁ , 18 g
g ₂ ), two ring-shaped lips (18 g ₁ ,
18g ₂ ) in a direction substantially orthogonal to the cooling water passage (18
h _1, a thermostat, characterized in that 18h ₂₎ was formed. 3. A thermostat which is provided in a cooling water passage of an internal combustion engine or the like and opens and closes the cooling water passage, and is fixed to a moving member (13) of a thermo element ( TH ) which operates by sensing a cooling water temperature. Valve (18) and thermostat
(14a) for attaching the
And the supporting portion (1) with which the tip of the moving member (13) abuts.
4c) formed in a valve seat body (14),
(18) becomes more and valve seat approaching and moving away from (14b), the valve seat (14b) the valve body (18) toward or away from a substantially horizontal valve seat portion (14b ₁₎ and substantially perpendicular valve seat portion (14b ₂ )
The valve element (18) has a substantially horizontal valve element part (1) formed in a convex shape on the side and coming into contact with and separating from the horizontal valve seat part (14b ₁ ).
And 8e), a substantially vertical valve body toward or away in the vertical valve seat portion (14b ₂₎ and (18f), 2 pieces of ring-shaped lip which is formed in the vertical valve body _{(18f) (18g 1, 18g} 2 )
Has the door, in several places of the horizontal valve body (18e) side of the first ring-shaped lip (18 g _1), a small aperture in a direction substantially perpendicular to the first ring-shaped lip (18 g ₁₎ Cooling A water passage (18h ₁ ) is formed, and the vertical valve body (1
The upper end side of the second ring-shaped lip 8f) (in several places 18 g _2), the second ring-shaped lip (18 g ₂₎ and opening large cooling water passage in a direction substantially perpendicular (18h ₂₎
A thermostat, characterized in that a thermostat is formed. Wherein said cooling water passage, said valve body (18) gradually before toward the horizontal valve body portion to (18e) from the top side of the
The cooling water passage is formed by an opening groove which becomes narrower, The cooling water passage is formed in any one of Claims 1 thru | or 3.
Thermostat. 5. The thermo-element ( TH ) has a case (6) containing a thermal expansion body (7) that thermally expands / contracts due to a change in the temperature of the cooling water. A guide cylinder (9) connected to the case (6) by shrinkage
Having said moving member sliding (13) and, together with the tip portion of the movable member (13) is supported on the top (14c ') of the supporting portion of the valve seat body (14) (14c),
Wherein said valve body is fixed to the guide cylinder (9) which follow to recoil movement to the sliding of the moving member (13) (18), against the valve seat the valve seat body (14) (14b) 2. The apparatus according to claim 1, wherein the apparatus is configured to operate so as to be separated.
The thermostat according to claim 4 .