WO2017217016A1

WO2017217016A1 - Thermoactuator equipped with lock function

Info

Publication number: WO2017217016A1
Application number: PCT/JP2017/006506
Authority: WO
Inventors: 和仁下村; 洋治佐藤
Original assignee: 日本サーモスタット株式会社
Priority date: 2016-06-17
Filing date: 2017-02-22
Publication date: 2017-12-21
Also published as: JP6687470B2; JP2017223332A

Abstract

[Problem] To provide a highly durable thermoactuator equipped with a lock function and capable of smoothly locking a retainer while the retainer is lifted. [Solution] A guide body 11 for supporting a retainer 15 is equipped with a cylindrical section 11a which rises from the base section thereof, a tapered section 11c, the external diameter of which increases toward the tip of the cylindrical section, and a locking-member engaging groove 11d which is contiguous with the tapered section and recesses in the axial core direction. The retainer 15 covers the tapered section 11c and the cylindrical section 11a of the guide body, and is configured so as to move in the axial direction relative to the guide body 11 on the basis of the expansion or contraction of wax. The retainer is locked when part of a locking member 17 attached to the retainer 15 slides along the tapered section 11c of the guide body 11 when the retainer is in a prescribed lifted state, and engages the engaging groove 11d.

Description

Thermo actuator with lock function

The present invention is a lock function that is attached to an engine, for example, and that causes the retainer to advance and retreat due to expansion and contraction of wax accompanying a temperature change on the engine side, and locks the retainer position in that state when the retainer protrudes beyond a predetermined level. The present invention relates to a thermoactuator including

The thermoactuator is used in automobile radiators, etc., and incorporates a thermal expansion body that expands and contracts due to changes in the temperature of the detected object such as cooling water, and cools by moving the retainer up and down by the volume change of the thermal expansion body The water valve is opened and closed. Accordingly, the cooling water is appropriately circulated so as to keep the temperature of the cooling water within a certain range.
This thermoactuator is provided with a lock function to prevent the retainer from returning when the retainer rises (projects) beyond the specified range due to overheating of the cooling water temperature, so that the valve body is opened to prevent overheating. A device having a lock function has been proposed.

Patent Document 1 discloses a thermoactuator having a lock function proposed by the present applicant. This thermoactuator is shown in FIGS. 19 to 21, and an example of a conventional thermoactuator having a lock function will be described based on FIGS. 19 to 21. FIG.

In this thermoactuator 100, a case 103 is attached to the lower part of a guide body 102 that guides a piston rod 101, and a thermal expansion body 104 such as wax is accommodated in the case 103. The upper surface of the thermal expansion body 104 is covered with a rubber diaphragm 105, and the piston rod 101 is placed through an intermediate fluid 106, a rubber rubber piston 107, and a protective plate 108.
A lock groove 101a is formed on the peripheral surface of the body of the piston rod 101, a recess 101b is formed at the upper end, and a metal sphere 109 is fitted into the recess 101b.

Further, an accommodation groove 102 a is formed on the inner periphery of the upper portion of the guide body 102, and an O-ring 110 that is an engaging member is fitted therein. The O-ring 110 is in sliding contact with the outer peripheral surface of the piston rod 101.
Further, the sphere 109 at the upper end of the piston rod 101 is rotatably mounted so that the sphere 109 does not fall out of the recess 101b by caulking the tip of the recess 101b inward. It abuts on an arm 111 that drives a body or a link member.

In the thermoactuator 100 configured as described above, when the temperature of the cooling water rises, the thermal expansion body 104 expands and pushes up the piston 107. As a result, the piston rod 101 moves up in the guide body 102 and pushes the arm 111 to open the valve body against a return spring (not shown). Further, since the thermal expansion body 104 contracts when the temperature decreases, the piston rod 101 is returned to the original position in the guide body 102 by the return spring.

However, when the temperature of the cooling water exceeds a predetermined temperature, as shown in FIG. 21, the piston rod 101 rises to the maximum ascent position in the guide body 102 and pushes up the arm 111 to open a valve body (not shown). It will be. When the lock groove 101a of the piston rod 101 is located at the same position as the receiving groove 102a of the guide body 102, the O-ring 110 enters the lock groove 101a, and the O-ring 110 and the lock groove 101a engage with each other. The rod 101 is stopped at that position to enter the locked state.

When the piston rod 101 is locked in this way, the valve opening state is maintained by the thermoactuator 100, so that, for example, in winter, when the engine is restarted, the heater is not effective and the water temperature gauge needle rises. Symptoms such as dullness are exhibited, and the driver can be made aware of overheating during the previous driving. As a result, it is possible to notice a failure of the engine or the like, and it is possible to avoid the trouble of causing fatal damage to the engine or the like.

Japanese Patent No. 4098877

By the way, according to the above-described conventional thermoactuator 100, the O-ring that functions as a lock function is disposed in the receiving groove formed on the inner peripheral surface of the guide body that supports the piston rod. It is always in sliding contact with the peripheral side surface.
For this reason, a sliding resistance is always generated between the O-ring and the piston rod, and mechanical galling or the like is likely to occur between them, which causes wear of the O-ring.

In addition, since the receiving groove in which the O-ring is disposed needs to be formed on the inner peripheral surface of the guide body, a high-precision cutting technique is required, which reduces productivity and is reflected in an increase in cost. There is a problem that. Further, since the reliability of the lock function may be reduced due to deterioration of the O-ring due to long-term use, it is desired to improve the durability.

The present invention is intended to solve the technical problems of the above-described thermoactuator using the above-described O-ring as a lock function, preventing wear and deterioration of the lock member, and the retainer protruding to a predetermined position. It is an object of the present invention to provide a thermoactuator having a durable locking function that can smoothly lock the retainer in the lifted state.

The thermoactuator according to the present invention made to solve the above-described problems includes an element case containing wax that expands or contracts due to a temperature change, a retainer based on the expansion or contraction of the wax, to which the element case is attached. And a cylindrical casing body that covers at least the retainer of the thermo element, and supports the retainer side or the retainer that moves in the axial direction. A lock member that locks the position of the retainer in a predetermined lift state of the retainer is disposed on either one of the casing side that covers the guide body or the retainer, and the latch member that engages the lock member on the other one. A joint is formed

In this case, in one preferable embodiment, the guide body includes a cylindrical portion that rises from a base end portion, a tapered portion that gradually increases an outer diameter toward the distal end of the cylindrical portion, and the tapered portion. An engaging groove that functions as the engaged portion is provided by being recessed in the axial direction, and the retainer covers the cylindrical portion and the tapered portion of the guide body, and the guide body is based on the expansion or contraction of the wax. And a part of the lock member attached to the retainer is positioned toward the guide body, and a predetermined lift of the retainer is configured. In this state, a configuration is adopted in which a part of the lock member slides on the taper portion of the guide body and fits into the engagement groove to lock the retainer.

In another preferred embodiment, in addition to the above-described configuration, the retainer has an outer diameter of the cylindrical portion that receives an end of a spring that biases the retainer toward the base end. A configuration is adopted in which a large-diameter collar is formed, and the lock member is accommodated in a groove hole in a direction perpendicular to the axis formed in the collar.

In each of the above embodiments, the lock member attached to the retainer is configured to move in the axial direction together with the retainer in a non-contact state with respect to the cylindrical portion rising from the proximal end portion of the guide body. It is desirable that

In another preferred embodiment, the retainer is configured to be able to advance and retreat based on the expansion or contraction of the wax at the upper end portion of the cylindrical casing body that covers the retainer, An engaging groove that functions as the engaged portion is formed on the outer peripheral surface of the retainer, and a part of the lock member is partly disposed on the outer peripheral surface of the retainer in a predetermined lift state. A configuration is adopted in which the retainer is brought into a locked state by being fitted into the engaging groove formed on the surface.

In addition, in each of the above-described embodiments, a stop ring formed by bending a wire rod in a U-shape is desirably used as the lock member, and a pair of bent legs following the center of the stop ring is provided with the pair of bent legs. It is comprised so that it may fit in the engaging groove which functions as a to-be-engaged part.

In still another preferred embodiment, the upper end of a cylindrical casing body covering the retainer is configured such that the retainer can advance and retreat based on expansion or contraction of the wax, and the retainer advances and retracts. A lock member that locks the position of the retainer in a predetermined lift state of the retainer is formed on a holder member of the packing disposed in the opening of the main body, and an engaged portion that engages with the lock member on the outer peripheral surface of the retainer A configuration in which is formed is adopted.

In still another preferred embodiment, the retainer is configured to be able to advance and retract based on the expansion or contraction of the wax at the upper end portion of the cylindrical casing body that covers the retainer, and the retainer advances and retracts. A lock member that locks the position of the retainer in a predetermined lift state of the retainer is disposed immediately below the holder member of the packing disposed in the opening of the casing body, and the outer peripheral surface of the retainer is engaged with the lock member. A configuration in which an engaging portion is formed is employed.

In this case, the engaged portion formed on the outer peripheral surface of the retainer in the two forms preferably has a tapered portion that gradually increases the outer diameter of the retainer along the axial direction, and the retainer following the tapered portion. And a step portion for reducing the outer diameter.

According to the above-described thermoactuator according to the present invention, when the engine becomes abnormal temperature due to a failure or the like and the retainer of the thermoelement reaches a predetermined lift state, the lock member is engaged with the engaged portion, The retainer is locked.
Therefore, even if the engine temperature is lowered due to the stop of the engine, the retainer is kept in the locked state, so that the user can recognize the fact that the engine is in an abnormal temperature state.

In some of the preferred embodiments described above, the lock member attached to the retainer moves in the axial direction together with the retainer, for example, in a non-contact state with respect to the cylindrical portion rising from the proximal end portion of the guide body. Since it is comprised, a thermo actuator can be operated, without giving sliding resistance to a locking member.
As a result, it is possible to provide a thermoactuator having a lock function that prevents the lock member from being worn or deteriorated, and has a lock function with excellent reliability and durability of the lock operation of the lock member with respect to the engaged portion.

It is the perspective view shown in the state which fractured | ruptured some casings about 1st Embodiment of a thermoactuator. It is the perspective view which similarly showed the lift state of the retainer. It is a principal part expanded sectional view in the state shown in FIG. It is a principal part expanded sectional view in the state shown in FIG. It is an expanded sectional view showing the wearing state of a lock member (stop ring). It is the perspective view shown in the state which fractured | ruptured some casings about 2nd Embodiment of a thermoactuator. It is the perspective view shown in the state which fractured | ruptured some casings about 3rd Embodiment of a thermoactuator. It is the perspective view which similarly showed the lift state of the retainer. It is a principal part expanded sectional view in the state shown in FIG. It is a principal part expanded sectional view in the state shown in FIG. It is a partial expansion perspective view which shows the mounting state of a lock member. It is an expansion perspective view of a lock member (stop ring). It is the front view shown in the state which fractured | ruptured about 4th Embodiment of a thermoactuator. It is the front view of the partially broken state which similarly showed the lift state of the retainer. It is the perspective view which showed the single-piece | unit structure of the holder member. It is the front view shown in the state which fractured | ruptured about 5th Embodiment of a thermoactuator. It is the front view of the partially broken state which similarly showed the lift state of the retainer. It is the perspective view which showed the single-piece | unit structure of the locking member. It is sectional drawing which shows an example of the conventional thermo actuator. Similarly, it is a partially enlarged view. It is the elements on larger scale which similarly show the lift state of a piston rod.

Hereinafter, a thermoactuator having a lock function according to the present invention will be described in order based on each embodiment shown in the drawings.
The thermoactuator described below is attached to the engine of an automobile, and as a preferable example, as shown in, for example, JP-A-2015-105645, as a driving source of a shielding plate for opening and closing a ventilation path of a radiator. Used.
In the drawings shown below, the same or corresponding parts are denoted by the same reference numerals, but in some drawings, representative parts are denoted by reference numerals, and detailed configurations thereof are attached to other drawings. In some cases, reference numerals are used for explanation.

First, FIG. 1 to FIG. 5 show a first embodiment.
The thermoactuator 1 is composed of a thermoelement 10, a cylindrical casing body 20 formed of a synthetic resin that covers the retainer of the thermoelement 10, and a flange 30 attached to the thermoelement 10. The thermo element 10 is provided with a guide body 11 made of a metal material, and an element case 12 containing wax that expands or contracts due to a temperature change is attached to a lower bottom portion of the guide body 11.

The upper half of the guide body 11 is formed in a cylindrical shape, and a piston rod 14 that is moved up and down by the thermal expansion of the wax is accommodated in the cylindrical portion 11a. In other words, the guide body 11 has substantially the same configuration as the guide body 102 (FIGS. 19 to 21) disclosed in Patent Document 1 described above.

In addition, a retainer 15 made of synthetic resin is fitted and attached to the tip of the piston rod 14 supported by the guide body 11, so that the retainer 15 together with the piston rod 14 is thermally expanded by the wax. It works to move up and down according to.
An operating element 15a is formed at the distal end of the retainer 15, and an action of rotating a shielding plate for opening and closing a ventilation path of a radiator (not shown) by movement of the operating element 15a in the axial direction. To do.

As shown in FIGS. 3 and 4, a casing body 20 made of synthetic resin that covers the retainer 15 is attached along the annular base end portion 11 b of the guide body 11.
An opening 20 a through which the retainer 15 advances and retreats is formed at the upper end of the casing body 20, and a packing 5 is disposed in the opening 20 a so as to surround the retainer 15. The packing 5 is a holder member 6. Is held down by. The packing 5 ensures a seal between the retainer 15 and the casing body 20.

In the gap space between the retainer 15 and the casing body 20, a return spring (coil spring) 7 that is extendable and contractible in the axial direction is disposed.
The upper end portion of the return spring 7 is seated on the lower surface of the holder member 6, and the lower end portion is seated on a flange portion 15 b formed on the peripheral surface of the end portion of the retainer 15. The retainer 15 is urged in the direction toward the casing body 20.
That is, when the wax of the thermo element 10 is thermally expanded, the retainer 15 contracts the return spring 7 and moves forward (ascends), and causes the actuator 15 a to protrude from the casing body 20. When the wax contracts, the retainer 15 moves backward (lowers) under the action of the return spring 7.

As shown in FIGS. 1 and 2, a flange 30 formed of a metal plate is attached to the annular base end portion 11 b of the guide body 11. The flange 30 is formed with a fastening hole 31 for screw insertion at a position having an angle of about 90 degrees in the horizontal direction as shown in the figure. A thermoactuator is used by using a fastening screw (not shown). 1 is fastened to the engine.
A ring member 32 is interposed between the flange 30 and the casing body 20.

As shown in FIGS. 3 to 5, a slot 15c is formed near the lower bottom of the retainer 15 in a direction perpendicular to the axis, and a stop ring 17 serving as a lock member is formed in the slot 15c. Has been inserted.
The stop ring 17 is configured by bending a metal wire (for example, a piano wire) into a substantially U shape as shown in FIG. That is, the stop ring 17 is formed by bending a pair of bent leg portions 17b slightly outward from each other following the U-shaped bent central portion 17a. Furthermore, the front end portion of each leg portion 17b is formed toward both outer sides so as to form a C shape, thereby constituting a guide portion 17c.

The stop ring 17 is inserted into the groove 15c so as to straddle the columnar connecting portion 15d that connects the retainer 15 up and down by using a guide portion 17c formed in a C shape. The pair of bent legs 17b of the stop ring 17 thus mounted is mounted in a state of being slightly opened left and right in the slot 15c.
Accordingly, as shown in FIG. 5, the pair of bent legs 17 b of the stop ring 17 is in a non-contact state with the cylindrical portion 11 a rising from the base end portion 11 b of the guide body 11, and the retainer 15. In addition, it is configured to move in the axial direction.

On the other hand, as shown in FIGS. 3 and 4, the cylindrical portion 11a has a tapered portion 11c that gradually increases the outer diameter toward the tip, and a concave portion in the axial direction following the tapered portion 11c. An engaged portion (engagement groove) 11d into which a part of the stop ring 17 (the bent leg portion 17b) as a lock member is fitted is provided.
Therefore, when the retainer 15 is raised by the thermal expansion of the wax, the pair of bent legs 17b in the stop ring 17 attached to the retainer 15 comes into contact with the tapered portion 11c and the inner diameter is expanded. Then, in the predetermined lift state of the retainer 15 shown in FIG. 4, the pair of bent leg portions 17b of the stop ring 17 are smoothly fitted into the engagement grooves 11d of the guide body 11, and the retainer 15 is locked.

As shown in FIG. 4, when the stop ring 17 is inserted into the engaging groove 11 d of the guide body 11 and the retainer 15 is locked, the retainer 15 is The protruding state is maintained by the action of the stop ring 17.
Therefore, the above-described state of the retainer 15 allows the user to recognize the fact that the temperature of the engine has risen excessively, and it is possible to avoid the trouble of causing fatal damage to the engine or the like.

According to the first embodiment described above, the lock member (stop ring) 17 attached to the retainer 15 is not in contact with the cylindrical portion 11 a rising from the base end portion of the guide body 11 and is pivoted together with the retainer 15. Since it moves in the direction, the thermoactuator 1 can be operated without giving sliding resistance to the lock member 17.
Accordingly, it is possible to prevent the lock member 17 from being worn or deteriorated, and to provide a lock function with excellent reliability and durability of the lock operation of the lock member 17 with respect to the engaging groove 11d. The effect as described in the effect column can be obtained.

FIG. 6 shows a second embodiment. In FIG. 6, the main parts corresponding to the respective parts in the first embodiment already described are denoted by the same reference numerals. Therefore, the description is omitted as appropriate.
In the second embodiment, a slot 15e is formed in a large diameter flange portion 15b formed in the lower bottom portion of the retainer 15 in a direction perpendicular to the axis. And the stop ring 17 as a locking member is accommodated in the slot 15e.

The stop ring 17 is the same as that used in the first embodiment already described, and other configurations are the same as those in the first embodiment already described.
Although not shown in FIG. 6, a columnar connecting portion similar to the columnar connecting portion 15d shown in FIG. 5 exists in the slot 15e formed in the flange portion 15b, and this columnar connecting portion. The upper and lower portions of the flange portion 15b are connected to each other.

According to the second embodiment, the slot 15e that accommodates the stop ring 17 is formed in the large-diameter flange portion 15b provided in the retainer 15, so that the design including the dimensions and shape of the stop ring 17 can be made. Can have a width. In the second embodiment, the same effects as those in the first embodiment can be obtained.

FIGS. 7 to 12 show a third embodiment, and the main parts corresponding to the respective parts in the embodiments described above are denoted by the same reference numerals. Therefore, the description is omitted as appropriate.
In the third embodiment, a casing extension 20 b having a slightly smaller diameter than the casing body is formed at the upper end of the casing body 20. A locking groove 20c that can lock the stop ring 17 that functions as a locking member is formed near the upper end of the extension 20b.

The stop ring 17 used in the third embodiment is formed of a metal wire so as to have substantially the same form as the stop ring 17 shown in FIG. Parts corresponding to the respective parts shown in FIG.
The stop ring 17 shown in FIG. 12 has a large dimension between a U-shaped bent central portion 17a and a pair of bent leg portions 17b curved outward. As a result, when the stop ring 17 is mounted on the thermoactuator 1 as shown in FIG. 11, the bent central portion 17a is gripped and can be easily attached to and detached from the thermoactuator 1. Yes.

On the other hand, an engagement groove 15f is formed on the outer peripheral surface of the retainer 15 as an engaged portion to which a part of the stop ring 17 disposed on the casing body 20 side is engaged in a predetermined lift state of the retainer. Yes.
Therefore, when the retainer 15 is gradually lifted from the state shown in FIG. 9 and reaches the predetermined lift state shown in FIG. 10, the pair of bent legs 17b of the stop ring 17 are fitted into the engaging grooves 15f of the retainer 15. Then, the retainer 15 is locked.

According to the third embodiment, the stop ring 17 disposed in the locking groove 20c on the casing body 20 side is always in a state of sliding on the retainer 15. However, as shown in FIG. 9, the engaging groove 15 f of the retainer 15 is located above the packing 5.
Thereby, even if the retainer 15 has a sliding mark due to the stop ring 17, it is possible to avoid the problem that the seal between the retainer 15 and the casing body 20 by the packing 5 is inhibited.

FIG. 13 to FIG. 15 show a fourth embodiment, and the main parts corresponding to the respective parts in the respective embodiments already described are denoted by the same reference numerals. Therefore, the description is omitted as appropriate.
In the fourth embodiment, a packing 5 is disposed so as to surround the retainer 15 in an upper end opening 20a of the resin casing body 20 in which the retainer 15 advances and retreats. The packing 5 is made of a resin holder member 6. Is held down by. A lock member 6 c that locks the position of the retainer 15 in a predetermined lift state of the retainer 15 is formed integrally with the holder member 6.
On the other hand, an engaged portion (step portion) 15 h that engages with a lock member 6 c formed on the holder member 6 is formed on the outer peripheral surface of the retainer 15.

FIG. 15 shows a single structure of the holder member 6, which is formed in a ring shape and has an opening 6a through which the retainer 15 is inserted at the center. In addition, a pair of leg portions 6b are erected at axially symmetrical positions on the lower surface of the holder member 6, and a pair of leg portions 6b are formed with hook-like lock members 6c toward the inside.

On the other hand, the engaged portion 15h formed on the outer peripheral surface of the retainer 15 has a tapered portion 15g that expands the outer diameter of the retainer 15 along the axial direction, and an outer diameter of the retainer 15 following the tapered portion 15g. A step portion 15h for reduction is provided.
Then, in the predetermined lift state of the retainer 15, the stepped portion 15 h of the retainer 15 is engaged with a pair of lock members 6 c formed integrally with the holder member 6 as shown in FIG. It is locked.

In the fourth embodiment, the flange 30 is resin-molded integrally with the casing body 20. Fastening portions are formed on the flange 30 so as to be symmetrical with respect to the left and right, and a metal sleeve 34 formed in a ring shape is fitted and attached to each fastening portion. The sleeve 31 functions as a mechanical reinforcing member when the flange 30 formed of resin is screwed.

The flange 30 is formed with a groove-shaped window hole along the side surface of the flange 30, and the locking member 40 having the same form as the stop ring 17 is inserted into the groove-shaped window hole. Has been. Thus, the thermo element 10 is attached to the integrally formed casing body 20 and the flange 30 without dropping in the axial direction.

According to the fourth embodiment, since the outer peripheral surface of the retainer 15 moves relative to the lock member 6c integrally formed with the holder member 6 in a non-contact state, sliding resistance is given to the lock member 6c. The thermoactuator 1 can be operated. Therefore, according to the fourth embodiment, it is possible to obtain the same operational effects as those of the first embodiment shown in FIGS.

16 to 18 show a fifth embodiment, and the same reference numerals are given to the main parts corresponding to the respective parts in the fourth embodiment shown in FIGS. 13 to 15. Therefore, the description is omitted as appropriate.
In the fifth embodiment, a lock member 8 that locks the position of the retainer 15 in a predetermined lift state of the retainer 15 is provided immediately below the holder member 6 that holds the packing 5 disposed in the upper end opening 20a of the casing body 20. Is arranged.

FIG. 18 shows a single structure of the lock member 8. The lock member 8 is formed in a ring shape from a metal material, and an opening 8a through which the retainer 15 is inserted is formed at the center. An annular engagement piece 8c bent in the axial direction (inner side) is formed at the end of the cylindrical portion 8b surrounding the opening 8a.
As shown in FIGS. 16 and 17, the upper end portion of the return spring 7 abuts against the lock member 8, and the lock member 8 is supported in a state where it is pressed against the holder member 6.

The outer peripheral surface of the retainer 15 has a tapered portion 15g that expands the outer diameter of the retainer 15 along the axial direction as in the fourth embodiment, and the outer diameter of the retainer 15 is reduced following the tapered portion 15g. A step portion 15h as an engaged portion is provided.
Therefore, when the retainer 15 is in a predetermined lift state, as shown in FIG. 17, the step portion 15 h of the retainer 15 is engaged with the engagement piece 8 c bent inside the lock member 8, so that the retainer 15 is It is locked.
Although not shown in FIG. 18, the engagement piece 8c of the lock member 8 is provided with one or more slit-shaped cuts from the inside toward the cylindrical portion 8b side, whereby the engagement piece 8c. Can be more easily bent. According to this, in the above-described predetermined lift state of the retainer 15, the engaged portion (step portion 15 h) of the retainer 15 can be more smoothly engaged with the engagement piece 8 c of the lock member 8. This can contribute to improving the reliability of the function operation.

According to the fifth embodiment, since the outer peripheral surface of the retainer 15 moves relative to the lock member 8 arranged immediately below the holder member 6 in a non-contact state, sliding resistance is given to the lock member 8. The thermoactuator 1 can be operated without any problems.
Therefore, also in the fifth embodiment, it is possible to obtain the same effect as that of the first embodiment.

As described above, according to the thermoactuator having a lock function according to the present invention, in addition to the operational effects described in the above-mentioned column of the effect of the invention, each of the explanations corresponding to the individual embodiments. The effect of this can be obtained.
In each of the embodiments, the thermoactuator is described based on an example in which the thermoactuator is mounted on the engine. However, the thermoactuator according to the present invention is not limited to the specific one described above as an attachment object, It can be used in various fields as an actuator.
Furthermore, in the above-described embodiment, it is described that each component member is formed of a metal or a resin material, but these may be changed as necessary and are limited to these. Not a thing.

DESCRIPTION OF SYMBOLS 1 Thermo actuator 5 Packing 6 Holder member 6a Opening

6b Leg part

6c Lock member 7 Return spring (spring)
8 Lock member 8a Opening 8b Cylindrical part 8c Engagement piece 10 Thermo element 11 Guide body 11a Cylindrical part 11b Base end part

11c Taper part

11d Engaging groove 12 Element case 14 Piston rod 15 Retainer

15b Gutter part

15c Groove hole

15e Groove hole

15f Engagement groove 15g Taper part 15h Engagement part (step part)
17 Locking member (stop ring)
17a Bending center portion 17b Bending leg portion 17c Guide portion 20 Casing body 20a Opening

20b Extension portion

20c Locking groove 30 Flange 31 Fastening hole 40 Locking member

Claims

An element case containing a wax that expands or contracts due to a temperature change, a thermo element including the guide case that is attached to the element case and supports the retainer movably in the axial direction based on the expansion or contraction of the wax; A cylindrical casing body that at least covers the retainer of the thermo element, and is provided on either the retainer side that moves in the axial direction or the guide body that supports the retainer or the casing side that covers the retainer. A thermostat having a lock function, wherein a lock member that locks the position of the retainer in a predetermined lift state is disposed, and an engaged portion to be engaged with the lock member is formed on one of the other. Actuator.
The guide body includes a cylindrical portion that rises from a proximal end portion, a tapered portion that gradually increases in outer diameter toward the distal end of the cylindrical portion, and a concave portion that is recessed in the axial direction following the tapered portion. An engaging groove functioning as a joint is provided, and the retainer covers the cylindrical portion and the tapered portion of the guide body, and moves relative to the guide body in the axial direction based on the expansion or contraction of the wax. And a part of the lock member attached to the retainer is positioned toward the guide body, and in a predetermined lift state of the retainer, a part of the lock member is The thermoactuator according to claim 1, wherein the retainer is locked by being fitted into the engagement groove while sliding on the taper portion of the guide body.
The retainer is formed with a flange having a diameter larger than the outer diameter of the cylindrical portion that receives an end of a spring that biases the retainer toward the base end, and the lock member is attached to the flange. The thermoactuator according to claim 2, wherein the thermoactuator is housed in a slot in a direction perpendicular to the formed axis.
The lock member attached to the retainer is configured to move in the axial direction together with the retainer in a non-contact state with respect to the cylindrical portion rising from the base end portion of the guide body. The thermoactuator according to claim 3.
In the upper end portion of the cylindrical casing body that covers the retainer, the retainer is configured to be able to advance and retract based on the expansion or contraction of the wax, the lock member is disposed on the casing body side, and the retainer An engaging groove that functions as the engaged portion is formed on the outer peripheral surface of the retainer, and a part of the lock member is fitted into the engaging groove formed on the outer peripheral surface of the retainer in a predetermined lift state of the retainer. The thermoactuator according to claim 1, wherein the retainer is locked.
The lock member is constituted by a stop ring formed by bending a wire rod into a U-shape, and a pair of bent leg portions following the center portion of the stop ring is fitted into an engagement groove functioning as the engaged portion. The thermoactuator according to any one of claims 2 to 5, wherein the thermoactuator is configured as described above.
The holder of the packing disposed at the opening of the casing body in which the retainer advances and retreats at the upper end portion of the cylindrical casing body that covers the retainer, the retainer being configured to advance and retract based on the expansion or contraction of the wax. The member is formed with a lock member that locks the position of the retainer in a predetermined lift state of the retainer, and an engaged portion that engages with the lock member is formed on the outer peripheral surface of the retainer. The thermoactuator according to claim 1.
The holder of the packing disposed at the opening of the casing body in which the retainer advances and retreats at the upper end portion of the cylindrical casing body that covers the retainer, the retainer being configured to advance and retract based on the expansion or contraction of the wax. A lock member that locks the position of the retainer in a predetermined lift state of the retainer is disposed immediately below the member, and an engaged portion that engages with the lock member is formed on the outer peripheral surface of the retainer. The thermo-actuator according to claim 1.
The engaged portion formed on the outer peripheral surface of the retainer includes a tapered portion that gradually increases the outer diameter of the retainer along the axial direction, and a step portion that reduces the outer diameter of the retainer following the tapered portion. The thermoactuator according to claim 7 or 8, wherein the thermoactuator is configured.