JP2019138318A - Valve core and manufacturing method of the same and tire valve - Google Patents

Abstract

To provide a valve core which achieves higher insulation reliability than a conventional valve core when used as a connection line, and to provide a manufacturing method of the valve core and a tire valve.SOLUTION: A valve core 10A of the invention includes: an insulative shaft 30A which penetrates through the inner side of a cylindrical base 11A and has a pipe shape; and a conductive path 40A serving as a metallic film which covers an entire inner peripheral surface of the insulative shaft 30A. Further, the conductive path 40A is connected to a lid body 17 which closes the insulative shaft 30A. The structure allows the conductive path 40A to be used as one of connection lines connecting internal and external circuits of a container (including a tire) to which the valve core 10A is attached.SELECTED DRAWING: Figure 1

Description

  According to the present invention, a valve body that penetrates the inside of a cylindrical base and protrudes laterally from the shaft is pressed against the front end portion of the cylindrical base from the front to close the valve, while the shaft is pressed forward. The present invention relates to a valve core that opens, a manufacturing method thereof, and a tire valve that incorporates the valve core.

  Conventionally, this type of valve core has a shaft coated with an insulating layer. For example, the above-mentioned shaft is used as one of connection lines that are attached to a tire and connect circuits inside and outside the tire. (For example, refer to Patent Document 1).

Japanese Patent No. 2654621 (FIG. 1, column 3, lines 20-30, column 4, lines 6-10)

  However, in the conventional valve core described above, the insulating layer that coats the shaft may be worn or peeled off due to sliding contact with the cylindrical base, which increases the reliability of insulation when the shaft is used as a connection line. There was a problem.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a valve core, a method for manufacturing the same, and a tire valve, which have higher insulation reliability than that of the related art when used as a connection line.

  In order to achieve the above object, according to the first aspect of the present invention, the shaft (30A-30E) penetrates the inside of the cylindrical base (11A, 11E) and projects sideways from the shaft (30A-30E). The valve body (19, 19E) is pressed against the front end (21, 29A) of the cylindrical base (11A, 11E) from the front to close the valve, while the shaft (30A-30E) is pressed forward. In the valve cores (10A to 10E) to be opened, the insulating shafts (30A to 30E) are formed as pipes by an insulating material and can maintain the pipe shape independently even when pressed for the valve opening. ), A conductive path (40A to 40E) extending over substantially the whole of the insulating shaft (30A to 30E), and the fluid passes through the insulating shaft (30A to 30E). The conductive path (40A, 40B, 40D) is electrically connected to the conductive path (40A, 40B, 40D), or the conductive path (40C, 40E) passes through the conductive path (40B, 40D). The valve core (10A-10E) which has a cover body (17, 43, 44) comprised by a part or all of this.

  A second aspect of the present invention is the valve core (10A to 10E) according to the first aspect, wherein the insulating material is a fine ceramic.

  A third aspect of the present invention is the valve core (10D) according to the first aspect, wherein the insulating material is a resin.

  According to a fourth aspect of the present invention, in the valve core according to any one of the first to third aspects, the conductive path (40A) is a metal film coated on the inner peripheral surface of the insulating shaft (30A). 10A).

  According to a fifth aspect of the invention, the conductive path (40B, 40D) is a metal rod that is in close contact with the inner peripheral surface of the insulating shaft (30B, 30D). Valve core (10B, 10D).

  According to a sixth aspect of the present invention, the conductive path (40A) is laminated on the inner side of the first metal layer (41) and the first metal layer (41) closely contacting the inner peripheral surface of the insulating shaft (30A). The valve core (10A) according to claim 4 or 5, comprising a second metal layer (42).

  According to a seventh aspect of the present invention, in the valve core (10C) according to any one of the first to third aspects, the conductive path (40C, 40E) is an electric wire accommodated in the insulating shaft (30C, 30E). , 10E).

  The invention according to claim 8 is the valve core according to any one of claims 1 to 7, wherein the lid (43) is solder, brazing, or adhesive that is in close contact with the inner peripheral surface of the insulating shaft (30C). 10C).

  The invention according to claim 9 is a cap in which the lid (17) is fitted to the outside of the front end portion of the insulating shaft (30A) and the conductive path (40A) in the insulating shaft (30A) is connected. The valve core (10A to 10E) according to any one of claims 1 to 8.

  According to the invention of claim 10, the valve body (19) is overlapped with the flange (18) projecting laterally from the lid body 17 and the flange (18), and the front end of the cylindrical base (11A) is It is a valve core (10A-10D) of Claim 9 provided with the packing (16) which contact | abuts.

  The invention of claim 11 is a method of manufacturing a valve core (10A, 10B) for manufacturing the valve core (10A, 10B) according to any one of claims 4 to 6, wherein the insulating shaft ( 30A, 30B) is a manufacturing method of the valve core (10A, 10B) in which the conductive paths (40A, 40B) are formed.

  A twelfth aspect of the invention is a conductive material having the valve core (10A to 10E) according to any one of the first to eleventh aspects and a through hole (80A) in which the valve core (10A to 10E) is mounted. This is a tire valve (89) comprising a valve stem (80).

  The valve core (10A to 10E) according to claim 1 includes a pipe-shaped insulating shaft (30A to 30E) penetrating the inside of the cylindrical base (11A, 11E), and a conductive path (40A) over substantially the entire inside thereof. ~ 40E). Accordingly, the conductive path (40A to 40E) of the insulating shaft (30A to 30E) is used as one of connection lines connecting between the internal and external circuits of the container (including the tire) to which the valve core (10A to 10E) is attached. be able to. Here, the insulating shafts (30A to 30E) are formed into a pipe shape by an insulating material, and have a strength capable of maintaining the pipe shape independently even when pressed for valve opening. In other words, the insulating material constituting the insulating shaft (30A to 30E) has a pipe shape that is thick enough to have the aforementioned strength. Thereby, durability of the insulating material with respect to abrasion and peeling by a cylindrical base (11A, 11E) and sliding is higher than before. That is, in the valve cores (10A to 10E) of the present invention, the reliability of insulation when used as a connection line can be made higher than before.

  The insulating shaft described above may be made of fine ceramics or resin (inventions of claims 2 and 3), and has a strength capable of maintaining the pipe shape independently even when pressed to open the valve core. As long as it is an insulator, materials other than fine ceramics and resin may be used. The pressing force for opening the valve can be considered as a biasing force that the insulating shaft receives on the valve closing side based on the maximum fluid pressure in the specification of the valve core, and the insulating shaft is biased by the spring on the valve closing side. If it is, the resilience can be considered as a force combined with the urging force.

  Further, the conductive path may be a metal film coated on the inner peripheral surface of the insulating shaft (invention of claim 4), or may be a metal rod that is in close contact with the inner peripheral surface of the insulating shaft ( (Invention of Claim 5) An electric wire that does not adhere to the inner peripheral surface of the insulating shaft may be used (Invention of Claim 7). When the conductive path is a metal film or a metal rod, it can be formed in the insulating shaft by plating (invention of claim 11). In addition, if a multi-layer structure including the first metal layer and the second metal layer is provided (invention of claim 6), the electroplating layer can be superimposed on the electroless plating layer in the plating process, and the conductive path can be efficiently formed. Can be formed. Furthermore, a conductive path may be formed by containing powder or a rod-shaped metal in an insulating shaft made of fine ceramics and heating and melting and fixing the metal to the inner surface of the insulating shaft. Alternatively, a metal wire may be set in a resin molding die, an insulating shaft may be insert-molded so as to surround the metal wire, and the conductive path and the lid may be formed with the metal wire.

  The lid for the insulating shaft may be composed of solder, brazing, or adhesive that is in close contact with the inner peripheral surface of the insulating shaft (invention of claim 8). Moreover, you may arrange | position a cover body anywhere in the front-end part of a insulated shaft, a rear-end part, or an intermediate part. Further, as in the configuration of the ninth aspect, the lid may be a cap fitted to the outside of the front end portion of the insulating shaft, and the conductive path may be connected to the cap. Furthermore, it is good also as a valve body by overlapping packing on the flange projecting sideways from the cap (invention of claim 10). Further, instead of the cap, a flange may be extended laterally from a cylindrical body fitted to the outside of the insulating shaft, and a packing may be stacked thereon to form a valve body.

  Further, the valve body may be configured by coating a protrusion protruding laterally from the insulating shaft with a resin film or a metal film. Moreover, it is good also as a structure which coats a resin film or a metal film on the cylindrical shaft side, and contacts so that a valve body may bite there. Examples of the soft metal film include metal films having low hardness such as copper and brass.

  In the tire valve of claim 12, since the valve core of the present invention is accommodated in the through hole of the conductive valve stem, the valve body and the conductive path by the insulating shaft are insulated, and they are used as a pair of lines. Can be used. Further, the valve core of the present invention may be used by being housed in a through hole formed in a valve body of a valve other than a tire valve.

Side sectional view of the valve core according to the first embodiment of the present invention. Cross section of insulation shaft Cross section of a tire valve with a built-in valve core Cross-sectional view of the tip of a tire valve fitted with a valve cap Sectional view of the tip of the tire valve with the valve cap removed Side sectional view of the valve core according to the second embodiment Side sectional view of the valve core according to the third embodiment Side sectional view of the valve core according to the fourth embodiment Side sectional view of the valve core according to the fifth embodiment Side sectional view of the end of the insulating shaft Side sectional view of the end of the insulating shaft Side sectional view of the end of the insulating shaft Side sectional view of the end of the insulating shaft Side cross-sectional view of an insulating shaft Side cross section of tire pressure monitoring device Cross section of a tire valve with a built-in valve core

[First Embodiment]
The first embodiment according to the present invention is shown in FIGS. As shown in FIG. 1, the cylindrical base 11A of the valve core 10A of the present embodiment has the same structure as that of a well-known widely used valve core cylindrical base, and the rear end portion of the body sleeve 12 (FIG. 1). A sleeve 13 with a screw is rotatably connected to an upper end portion of the main body sleeve 12, and an elastomer seal sleeve 14 is fitted to the outer surface of the main body sleeve 12. The spring 15 accommodated in the cylindrical base 11A and the packing 16 that contacts the front end of the cylindrical base 11A are the same as those of a known valve core. Therefore, the valve core 10A of the present embodiment can be manufactured by newly manufacturing an insulating shaft 30A or the like described below and combining it with the existing cylindrical base 11A or the like.

  The insulating shaft 30A has a pipe shape with both ends open, and penetrates the cylindrical base 11A. The outer diameter of the insulating shaft 30 </ b> A is large enough to be supported by the shaft support hole 13 </ b> A at the rear end of the threaded sleeve 13 so as to be capable of linear movement. An intermediate protrusion 31 is integrally formed at a position near the front end of the insulating shaft 30A. The intermediate protrusion 31 has a tapered shape whose diameter is increased toward the front side (lower side in FIG. 1), and has a front surface orthogonal to the outer surface of the insulating shaft 30A.

  A metal cap-shaped lid 17 is fitted to the front end portion of the insulating shaft 30A and fixed with an adhesive. As a result, the front end face of the insulating shaft 30A is closed. A flange 18 projects laterally from the rear end portion of the lid body 17, and a cylindrical wall 18 </ b> A projects rearward from an outer edge portion of the flange 18. The shaft fitting component 17A composed of the lid body 17, the flange 18, and the cylindrical wall 18A is formed by drawing a sheet metal.

  An insulating disc-shaped packing 16 is fitted in the cylindrical wall 18 </ b> A and overlapped on the flange 18. An intermediate protrusion 31 overlaps the inner edge portion of the rear surface of the packing 16. Further, the packing 16 protrudes rearward from the cylindrical wall 18A. A valve element 19 is constituted by the flange 18, the cylindrical wall 18A, and the packing 16, is opposed to the valve opening 20 that is the front opening of the cylindrical base 11A, and the valve opening 20 is opened and closed by the direct movement of the insulating shaft 30A. .

  A spring retainer 32 is fitted to a position near the rear end in the cylindrical base 11A in the insulating shaft 30A, and is fixed by, for example, an adhesive. A spring 15 that is a tapered compression coil spring is attached in a stretched state between the stepped portion 12D provided near the valve opening 20 on the inner surface of the cylindrical base 11A and the spring retainer 32, and the insulating shaft 30A is attached. It is energized backward. Thereby, normally, the packing 16 of the valve body 19 is pressed against the valve seat 21 which is the front end surface of the cylindrical base 11A, and the valve opening 20 is closed.

  The insulating shaft 30A is formed in a pipe shape from an insulating material. The insulating material is fine ceramics, and more specifically, for example, fine ceramics having high insulating properties used for electric parts such as a multilayer ceramic capacitor (MLCC). In addition, as fine ceramics which comprise the insulating shaft 30A, as long as it has insulation, what is not used for an electrical component may be used.

  A conductive path 40A is provided in the insulating shaft 30A. The conductive path 40A is configured by a metal film that covers substantially the entire inner peripheral surface of the insulating shaft 30A. The metal film can be formed by, for example, a plating process. Specifically, after the electroless plating process is performed on the entire insulating shaft 30A, the entire surface except the inner peripheral surface of the insulating shaft 30A is masked with a plating resist layer. Then, an electrolytic plating layer is formed on the electroless plating layer on the inner peripheral surface of the insulating shaft 30A by electrolytic plating. Thereafter, the plating resist layer is removed. Thereby, the conductive path 40A is formed only on the inner peripheral surface of the insulating shaft 30A. Therefore, for example, as shown in FIG. 2, the cross section of the insulating shaft 30A has a structure in which a thicker second metal layer 42 is stacked on the inner side of the first metal layer 41 in close contact with the inner peripheral surface of the insulating shaft 30A. Become. Since the first metal layer 41 is extremely thin, it may not be confirmed with a microscope or the like.

  Here, the insulating shaft 30A is slightly reinforced by the conductive path 40A. However, the insulating shaft 30A extends in a straight line even when receiving a pressing force for the valve opening operation of the valve core 10A in a single state without the conductive path 40A. It has the strength to maintain the pipe shape. The pressing force for the valve opening operation is considered to be a force that combines the urging force that the insulating shaft 30A receives on the valve closing side based on the maximum fluid pressure in the specification of the valve core 10A and the elastic force of the spring 15. be able to. In addition, when it does not have the spring 15, it can be considered as the urging force of only fluid pressure.

  This completes the description of the configuration of the valve core 10A of the present embodiment. This valve core 10A is manufactured by the following manufacturing method. That is, the insulating shaft 30A made of fine ceramics is prepared, and the conductive path 40A is formed inside by plating as described above. Next, the packing 16 and the shaft fitting component 17A are assembled to the insulating shaft 30A and fixed with an adhesive, and inserted into the main body sleeve 12 from the front end. And the spring 15 is inserted from the rear part of the main body sleeve 12, and the spring retainer 32 is fixed to the position near the rear end of the insulating shaft 30A with an adhesive. Next, the threaded sleeve 13 is fitted to the rear end portion of the main body sleeve 12, and the front end portion thereof is crimped. Then, the seal sleeve 14 is fitted to the outside of the main body sleeve 12 to complete the valve core 10A.

  Note that the spring retainer 32 may or may not be insulative. Further, the intermediate protrusion 31 may be separated from the insulating shaft 30A like the spring retainer 32 and fixed to the insulating shaft 30A with an adhesive or the like.

  Next, as shown in FIG. 3, a tire valve 89 having the valve core 10A will be described. The tire valve 89 has a valve stem 80 to which the above-described known valve core can be mounted. Specifically, as shown in FIG. 5, the through hole 80A inside the valve stem 80 is provided with a reduced diameter portion 80L near the tip, and a screw portion 80N is provided on the tip side from the reduced diameter portion 80L. It has been.

  The valve core 10A is inserted into the valve stem 80 and fixed in a state where the seal sleeve 14 is pressed against the reduced diameter portion 80L by screwing of the screw portions 13N and 80N. In this state, the insulating shaft 30 </ b> A slightly protrudes from the tip opening of the valve stem 80. As shown in FIG. 4, the resin valve cap 85 is screwed into the screw portion 80 </ b> M outside the valve stem 80, and the insulating shaft 30 </ b> A is protected without touching the valve cap 85.

  As shown in FIG. 3, the valve stem 80 is covered with an elastomeric grommet 81 on the outside. Then, the grommet 81 is press-fitted and fixed in the through hole 92 of the rim 91 of the tire wheel 90, for example. In this state, the base end portion of the valve stem 80 is located in a sealed space surrounded by the tire 93 and the rim 91. Further, the valve stem 80 protrudes from the grommet 81 in the sealed space, and the tire pressure monitoring device 95 is fixed to the protruding portion.

  The tire pressure monitoring device 95 detects the pressure in the tire 93 and wirelessly transmits the detection result to the vehicle body to which the tire wheel 90 is attached. For this purpose, the tire pressure monitoring device 95 is provided with a circuit board 97 and a secondary battery 98 supported by a base 96, and the base 96 is fixed to the valve stem 80.

  In the present embodiment, for example, the tire valve 89 is used as a connection line in order to charge the secondary battery 98. That is, the negative electrode of the secondary battery 98 is conductively connected to the valve stem 80 by a cable (not shown). On the other hand, the positive electrode of the secondary battery 98 is conductively connected to the valve core 10 </ b> A via the cable 70.

  Specifically, the cable 70 is formed by covering the conductive wire 71 with an insulating coating 72, one end of the conductive wire 71 is exposed from the insulating coating 72, and is soldered to the distal end surface of the lid 17 of the valve core 10 </ b> A with solder 73 </ b> A. Yes. The cable 70 extends through the valve stem 80 and is drawn onto the circuit board 97 of the tire pressure monitoring device 95. One end of the wire 71 is exposed from the insulating coating 72, and the land of the circuit board 97 is soldered to the solder 73B. Soldered to be electrically connected to the positive electrode of the secondary battery 98. Further, the cable 70 is formed with a cable bending portion 70K by bending the position closer to the circuit board 97 side.

  This completes the description of the configuration of the tire valve 89 of the present embodiment. Next, functions and effects of the tire valve 89 and the valve core 10A will be described. In order to inject compressed air into the tire 93, the valve cap 85 may be removed and the compressed air may be supplied from the tip of the valve stem 80. Then, the valve core 10 </ b> A is opened by the pressure of the compressed air, and the compressed air is injected into the tire 93. When the valve cap 85 is removed and the insulating shaft 30A is pressed with a finger or a tool, the valve core 10A is opened and compressed air is discharged from the tire 93. Further, when the insulating shaft 30 </ b> A is pushed, the cable bending portion 70 </ b> K of the cable 70 is particularly deformed, and the load on the solder connection portions at both ends of the cable 70 is reduced.

  Further, the secondary battery 98 of the tire pressure monitoring device 95 can be charged using the tire valve 89. For this purpose, as shown in FIG. 5, the valve cap 85 is removed, and for example, the valve stem 80 is sandwiched by the clip 100 at the tip of the cable extending from the negative electrode of the charging circuit (not shown), and the cable extending from the positive electrode of the charging circuit is The probe 101 at the tip is inserted inside the rear end of the insulating shaft 30A. As a result, the conductive path 40A in the insulating shaft 30A and the valve stem 80 insulated from the conductive path 40A by the insulating shaft 30A serve as a pair of connection lines, and the charging circuit outside the tire 93 and the tire 93 The secondary battery 98 which is a part of the circuit is connected. The secondary battery 98 can be charged by supplying power from outside the tire 93 within the tire 93.

  As described above, the valve core 10A according to the present embodiment includes the pipe-shaped insulating shaft 30A penetrating the inside of the cylindrical base 11A, and the conductive path 40A extends on the inner side. Therefore, the valve core 10A includes the conductive path 40A. It can be used as one of the connection lines that connect between the circuits inside and outside the container (including tire) to be attached.

  Here, the insulating shaft 30A is formed into a pipe shape by an insulating material (for example, fine ceramics), and has a strength that maintains a pipe shape that extends linearly independently even when pressed for valve opening. . In other words, the insulating material constituting the insulating shaft 30A has a pipe shape that is thick enough to have such strength. As a result, the durability of the insulating material against abrasion and peeling due to sliding contact with the cylindrical base 11A becomes higher than before. That is, in the valve core 10A of this embodiment, the reliability of insulation when used as a connection line can be made higher than before.

[Second Embodiment]
The valve core 10B of this embodiment is shown in FIG. 6, and the conductive path 40B is a metal rod that is in close contact with the inner peripheral surface of the insulating shaft 30B. The conductive path 40B is formed by, for example, a plating process in the same manner as the conductive path 40A in the valve core 10A of the first embodiment described above. By performing the plating process for a long time, a rod-like shape is formed in the insulating shaft 30B. It has become. Other configurations of the present embodiment are the same as those of the first embodiment, and this configuration also provides the same effects as those of the first embodiment. In the present embodiment, the entire conductive path 40A also functions as a lid that closes the insulating shaft 30B.

[Third Embodiment]
The valve core 10C of the present embodiment is shown in FIG. 7, and a shaft fitting component 17C having a shape obtained by punching the bottom of the shaft fitting component 17A of the first embodiment is fitted to the front end portion of the insulating shaft 30C. Prepare. Moreover, the electric wire as the conductive path 40C passes through the inside of the insulating shaft 30C. Further, both ends of the insulating shaft 30C are closed by a pair of lid bodies 43, 43 formed by solidifying the adhesive, and an electric wire as a conductive path 40C passes through the lid bodies 43, 43. Further, the spring 15C of this embodiment is a compression coil spring having a uniform coil diameter, and is not inside the cylindrical base 11A, but outside the portion of the insulating shaft 30C that protrudes outward from the screwed sleeve 13. Is fitted. Then, the spring 15C is stretched between the spring retainer 32 fixed to the upper end portion of the insulating shaft 30C and the screw-attached sleeve 13, and urges the insulating shaft 30C toward the valve closing side. The configuration of this embodiment also has the same effect as that of the first embodiment.

  The lid 43 may be formed by solidifying a general resin adhesive, or after being injected into the insulating shaft 30C in a heated and melted state such as solder, solder, or hot melt. You may be comprised with the metal or resin to solidify. The lid 43 may be provided only at one end of the insulating shaft 30C or the other end may be opened. Furthermore, the electric wire as the conductive path 40C is preferably a single wire. The conductive path 40C may be covered with an insulating film such as enamel, for example, or may not be so. Also in this embodiment, as in the second embodiment, the entire conductive path 40C also functions as a lid that closes the insulating shaft 30C.

[Fourth Embodiment]
The valve core 10D of this embodiment is shown in FIG. 8, and the insulating shaft 30D is an insulating resin insert-molded product having a rod-shaped conductive path 40D inside. Specifically, both ends of a metal rod are fixed to a resin mold and set so as to be disposed at the center of an elongated cavity, and an insulating fiber reinforced resin is injected into the cavity to form an insulating shaft 30D. The metal rod becomes the conductive path 40D after being molded. Thereafter, the conductive path 40D exposed at both ends of the insulating shaft 30D is cut off. In addition, the insulating shaft 30D has a strength that maintains the shape of a pipe that extends linearly even when subjected to a pressing force for valve opening operation in a single state that the conductive path 40D does not have. Other configurations of the present embodiment are the same as those of the first embodiment, and this configuration also provides the same effects as those of the first embodiment.

[Fifth Embodiment]
The valve core 10E of the present embodiment is shown in FIG. 9, and has a cylindrical main body sleeve 12E that is shorter than the main body sleeve 12 described in the first embodiment. The main body sleeve 12E has a seal fitting portion 29 below the fitting connection portion 28 with which the sleeve 13 with the screw is fitted, and the entire inner and outer surfaces of the seal fitting portion 29 are formed of the resin coating 27. It is coated with. Further, the inner surface of the seal fitting portion 29 is a tapered portion 29A that gradually increases in diameter toward the front. Then, the screw portion 13N of the screw-attached sleeve 13 is screwed into the screw portion 80N of the valve stem 80 to a position where the resin coating 27 is crushed between the outer surface of the seal fitting portion 29 and the inner surface of the valve stem 80. The cylindrical base 11E is fixed to the valve stem 80.

  A valve body 19E is formed integrally with the insulating shaft 30E of the valve core 10E. Specifically, the insulating shaft 30E is made of fine ceramics, and the entire structure excluding the valve body 19E has a pipe structure. The valve body 19E includes a tapered portion 25 that gradually increases in diameter from the position near the front end of the insulating shaft 30E toward the front, and a cylindrical portion 26 that has a uniform diameter from the tapered portion 25 to the front end of the insulating shaft 30E. . The obtuse corner between the taper portion 25 and the cylindrical portion 26 bites into the resin coating 27 of the taper portion 29A of the seal fitting portion 29, and the valve opening inside the seal fitting portion 29 in the cylindrical base 11E. 20E is occluded.

  Inside the insulating shaft 30E, a conductive path 40E, which is a metal rod, is inserted and assembled. Specifically, a cylindrical head portion 44 is provided at the rear end portion of the metal rod constituting the conductive path 40E. Correspondingly, a stepped fitting portion 44A is formed at the rear end portion of the insulating shaft 30E by expanding the inner diameter thereof in a stepped shape. The head portion 44 is fitted into the fitting portion 44A and fixed with an adhesive. Thereby, the metal rod which comprises the electrically conductive path 40E is hold | maintained in the state centered by the center part of the insulation shaft 30E. The head portion 44 protrudes outward from the insulating shaft 30E.

  A recessed portion concentric with the insulating shaft 30E is formed at the front end portion of the valve body 19E, and the disk 24 is fitted and fixed thereto. And the metal rod which comprises the conductive path 40E penetrates the through-hole 24E which penetrates the center part of the disc 24, and protrudes outside. As described above, in the present embodiment, the conductive path 40E is configured by assembling separate parts to the insulating shaft 30E. Similar to the valve core 10C of the third embodiment, a spring retainer 32 is fixed to the outside of the rear end portion of the insulating shaft 30E, and a spring 15C is assembled between the spring retainer 32 and the sleeve 13 with the screw. ing. The configuration of this embodiment also has the same effect as that of the first embodiment.

[Other Embodiments]
In addition to the above-described embodiment, configurations exemplified below can be considered.

(1) In addition to the above-described embodiment, the present invention may be applied to any valve core provided with a shaft that penetrates the inside of the cylindrical base. For example, the present invention may be applied to a valve core having a coil spring in front of a cylindrical base, such as the valve core disclosed in Japanese Patent No. 2654621 described above as Patent Document 1.

(2) In the tire valve 89 of the above-described embodiment, the conductive path 40A and the valve stem 80 of the valve core 10A are used as one connection line, but the conductive path 40A and the tire wheel 90 are connected as a pair. It may be used as a line. Further, the conductive path 40A of the valve core 10A may be used for communication.

(3) As shown in FIG. 10 (A), an end face film 45 that covers the end face of the insulating shaft 30A is formed by a metal film constituting the conductive path 40A, or as shown in FIG. 10 (B). An outer surface film 46 may be formed to cover the end of the outer peripheral surface that is remote from the cylindrical base 11A. This facilitates the connection between the conductive path 40A and the circuit.

(4) Further, as shown in FIG. 11A, the conductive lid 47 is attached to the end of the insulating shaft 30A, and the emboss 47A of the lid 47 is fitted inside the conductive path 40A. It may be configured. Even in such a case, the connection between the conductive path 40A and the circuit is facilitated. Further, as shown in FIG. 11B, a conductive adhesive is applied between the back surface of the cap-shaped lid body 48 fitted to the outside of the end portion of the insulating shaft 30A and the end surface of the insulating shaft 30A. In addition, the adhesive may be in contact with the conductive path 40A.

(5) As shown in FIG. 12, the cap-shaped lid 17 that closes the front end of the insulating shaft 30 </ b> A may be separated from the flange 18.

(6) Like the lid 51 shown in FIG. 13, the insulating shaft 30 </ b> A may be attached to the front end portion, and the front surface may have a recess 51 </ b> A. If it does so, the conducting wire 71 of the cable 70 can be inserted in the recessed part 51A, and can be soldered with the solder 73C. Further, as shown in FIG. 14, the rear end portion of the insulating shaft 30A is sealed with the end face film 45, and the lead wire 71 of the cable 70 is inserted into the opening of the front end portion of the insulating shaft 30A and soldered with the solder 73D. Also good.

(7) As shown in FIG. 15, by causing the flexible piece 99 to protrude from the circuit board 97 of the tire pressure monitoring device 95 and connecting the cable 70 to the flexible piece 99, the linear movement of the insulating shaft 30A is achieved. The load may be absorbed by deformation of the flexible piece 99.

(8) As shown in FIG. 16, the insulating shaft 30A is extended forward from the valve body 19, and a hemispherical lid body 77 is formed at the tip and connected to the conductive path 40A. It is good also as a structure which contacted the cover body 77. FIG.

(9) The valve core of the present invention may be used by being housed in a through hole formed in a valve body of a valve other than a tire valve.

10A to 10E Valve core 11A Tubular base 11A, 11E Tubular base 16 Packing 17, 43, 44, 47, 48, 51, 77 Lid 18 Flange 19, 19E Valve body 30A to 30E Insulating shaft 40A to 40E Conducting path 41 First 1 metal layer 42 2nd metal layer 80 valve stem 80A through hole 89 tire valve

Claims (12)

The valve bodies (19, 19E) projecting laterally from the shafts (30A-30E) through the shafts (30A-30E) through the inner sides of the cylindrical bases (11A, 11E) are connected to the cylindrical bases (11A, 11E). 11E) In the valve core (10A to 10E) in which the shaft (30A to 30E) is pressed forward to open the valve while being pressed against the front end (21, 29A) from the front to close the valve,
An insulating shaft (30A-30E) as the shaft that is formed into a pipe shape with an insulating material and can maintain the pipe shape alone even when pressed for the valve opening;
Conductive paths (40A to 40E) extending over substantially the whole of the insulating shaft (30A to 30E);
The insulating shaft (30A-30E) is blocked so that fluid does not pass through, and is electrically connected to the conductive path (40A, 40B, 40D), or the conductive path (40C, 40E) penetrates. Or a valve core (10A to 10E) having a lid (17, 43, 44) constituted by a part or the whole of the conductive path (40B, 40D).   The valve core (10A to 10E) according to claim 1, wherein the insulating material is fine ceramics.   The valve core (10D) according to claim 1, wherein the insulating material is a resin.   The valve core (10A) according to any one of claims 1 to 3, wherein the conductive path (40A) is a metal film coated on an inner peripheral surface of the insulating shaft (30A).   4. The valve core (10 </ b> B, 10 </ b> D) according to claim 1, wherein the conductive path (40 </ b> B, 40 </ b> D) is a metal rod that is in close contact with an inner peripheral surface of the insulating shaft (30 </ b> B, 30 </ b> D). .   The conductive path (40A) includes a first metal layer (41) in close contact with the inner peripheral surface of the insulating shaft (30A), and a second metal layer (42) laminated on the inner side of the first metal layer (41). The valve core (10A) according to claim 4 or 5, comprising:   The valve core (10C, 10E) according to any one of claims 1 to 3, wherein the conductive path (40C, 40E) is an electric wire accommodated in the insulating shaft (30C, 30E).   The valve core (10C) according to any one of claims 1 to 7, wherein the lid (43) is solder, brazing, or adhesive that is in close contact with the inner peripheral surface of the insulating shaft (30C).   The said cover (17) is a cap which is fitted to the outer side of the front end part of the said insulation shaft (30A), and the electrically conductive path (40A) in the said insulation shaft (30A) is connected. The valve core according to any one (10A to 10E).   The valve body (19) includes a flange (18) projecting laterally from the lid body 17, a packing (16) overlaid on the flange (18), and abutting the front end of the cylindrical base (11A). The valve core (10A to 10D) according to claim 9, further comprising: In the manufacturing method of the valve core (10A, 10B) for manufacturing the valve core (10A, 10B) according to any one of claims 4 to 6,
A manufacturing method of a valve core (10A, 10B) in which the conductive path (40A, 40B) is formed in the insulating shaft (30A, 30B) by plating. The valve core (10A to 10E) according to any one of claims 1 to 11,
A tire valve (89) comprising a conductive valve stem (80) having a through hole (80A) in which the valve core (10A to 10E) is mounted.

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