JP2008223693A - Pcv valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate the necessity of provision of a connection for energy transmission between a plurality of members constituting a housing in order to supply the energy to a heating means. <P>SOLUTION: The PCV valve 1 is provided with a housing 3 comprising a main housing 4 and a sub-housing 5 to constitute gas ducts 4d, 5c; a valve element 10 which is held in the housing 3 in order to operate gas-flow regulation; and an electric heater 6 for heating at least the valve element 10. The main housing 4 and the sub-housing 5 constituting the housing 3 make up a part of the gas ducts 4d, 5c. An electric heater 6 is held in the main housing 4, which includes connection terminals 23 and a connector 4a to supply electricity to the electric heater 6. The main housing 4 includes a part from an inlet 4e for conducting blowby gas to the gas duct 4d to a gas-flow rate regulation part 13 operated by the valve element 10. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a PCV valve (positive crankcase ventilation) provided in a blow-by gas reduction device that prevents blow-by gas leaking from a combustion chamber of an engine from returning to the engine intake system and releasing it to the atmosphere.・ Valve).

  Conventionally, a PCV valve with a heater described in Patent Documents 1 to 3 below is known as this type of technology. The reason why the heater is provided in the PCV valve is to release the freezing of the valve body of the PCV valve by causing the heater to exert a heating function when cold. This type of PCV valve includes an electric heater. In particular, the PCV valve described in Patent Document 1 is provided in a casing formed by combining an upper casing and a lower casing, a valve body (valve member) accommodated in the casing, and both ends of the lower casing. A first heater and a second heater. A power supply for each heater and an external connection to the switch are provided in the upper casing.

Japanese Utility Model Publication No. 60-98709 Japanese Utility Model Publication No. 61-122313 Japanese Utility Model Publication No. 5-87212

  However, in the PCV valve with a heater described in Patent Document 1, a lower casing in which the first and second heaters are attached and an upper casing in which an external connection portion for the heater power source is provided are separate members. For this reason, a contact (connecting portion) for wiring is required between both casings. For this reason, as much as the connection portion is provided, the labor of wiring increases, and there is a concern about poor connection.

  The present invention has been made in view of the above circumstances, and an object thereof is a PCV valve in which it is not necessary to provide a connection portion for energy transmission between a plurality of members constituting the housing in order to supply energy to the heating means. Is to provide.

  In order to achieve the above object, the invention according to claim 1 comprises a housing comprising a plurality of members and constituting a gas passage, a valve body accommodated in the housing and operating for gas flow rate adjustment, and at least a valve. In the PCV valve provided with a heating means for heating the body, the plurality of members constituting the housing includes a first housing which forms a gas passage and is provided with the heating means. The first housing includes a heating means. It is intended that an external connection part for supplying energy to be provided.

  According to the structure of the said invention, a gas channel is comprised in the 1st housing which comprises a housing, and a heating means is provided. The first housing is provided with an external connection for supplying energy to the heating means. Therefore, it is not necessary to provide an external connection part for supplying energy to the heating means in a member other than the first housing.

  In order to achieve the above object, according to a second aspect of the present invention, in the first aspect of the present invention, the first housing extends from the inlet for introducing gas into the gas passage to the gas flow rate adjusting portion by the valve body. The purpose is to include.

  According to the configuration of the invention, in addition to the operation of the invention according to claim 1, since the first housing provided with the heating means includes from the inlet to the gas flow rate adjusting unit, from the inlet to the gas flow rate adjusting unit. The gas passage and the valve body can be heated by the heating means.

  In order to achieve the above object, according to a third aspect of the present invention, in the second aspect of the present invention, the plurality of members constituting the housing further include a second housing, and the second housing is a gas flow rate adjusting unit. The purpose is to form a gas passage on the downstream side.

  According to the configuration of the invention described above, in addition to the operation of the invention according to claim 2, the second housing constituting the gas passage on the downstream side from the gas flow rate adjusting portion is constituted by a member different from the first housing. Therefore, the second housing can be commonly used even among models having different specifications for mounting to the heating means or the engine.

  In order to achieve the above-mentioned object, the invention according to claim 4 comprises a housing comprising a plurality of members and constituting a gas passage, a valve body housed in the housing and operating for gas flow rate adjustment, and at least a valve The heating means for heating the body, and the plurality of members constituting the housing include a first housing that forms a gas passage and is provided with the heating means, and a second housing that is assembled to the first housing. The first housing is molded, and at least the valve body is incorporated into the molded first housing, and the at least the incorporated valve body is enclosed in the first housing. The purpose is to assemble the second housing to the first housing.

  According to the configuration of the above invention, the housing is configured by assembling the second housing to the first housing in which at least the valve body is sealed, and the heating means is provided in the first housing, so that energy is supplied to the heating means. There is no need to provide an external connection part for the second housing.

  According to the first aspect of the present invention, it is not necessary to provide a connection portion for energy transmission between a plurality of members constituting the housing in order to supply energy to the heating means, and manufacturing can be simplified. Connection failure can be prevented.

  According to the second aspect of the present invention, in addition to the effect of the first aspect of the invention, the valve body and the gas flow rate adjusting part, which are the main parts of the PCV valve, can be effectively heated, and freezing is prevented. be able to.

  According to the third aspect of the present invention, in addition to the effect of the second aspect of the invention, the second housing can be used universally to simplify the production of a plurality of types of PCV valves. .

  According to the invention described in claim 4, it is not necessary to provide a connection part for energy transmission between a plurality of members constituting the housing in order to supply energy to the heating means, and manufacturing can be simplified. Connection failure can be prevented.

[First Embodiment]
Hereinafter, a first embodiment of the PCV valve according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a sectional view showing a PCV valve 1 according to this embodiment. As is well known, the PCV valve 1 is provided in a blow-by gas reduction device that returns blow-by gas leaked from the engine to the crankcase to the intake system of the engine to prevent release to the atmosphere. As shown in FIG. 1, the PCV valve 1 includes a resin housing 3 having a hollow shape. The housing 3 includes a main housing 4 and a sub housing 5 that are assembled with each other.

  The main housing 4 includes a connector portion 4a formed at an upper portion thereof, and an electric heater 6 provided integrally therewith. A seal ring 8 is attached to the outer periphery of the main housing 4. The sub-housing 5 is assembled to the main housing 4 by press-fitting one end outer periphery 5 a into the other end inner periphery 4 c of the main housing 4 and ultrasonically welding the sub housing 5. The other end of the sub housing 5 forms a pipe joint 5b. A pipe is connected to the pipe joint 5b, and the pipe is connected to the intake system of the engine. The housing 3 is attached to the mounting hole by tightening the male screw 4b on the outer periphery of one end of the main housing 4 to the female screw of the mounting hole of the engine body.

  The hollow portion of the main housing 4 constitutes a valve chamber 4d. The valve chamber 4d includes an inlet 4e at one end in the axial direction thereof. The inlet 4e is formed in one end wall of the main housing 4 and communicates with the engine body. The sub housing 5 includes a hollow portion 5 c that communicates with the valve chamber 4 d of the main housing 4. The valve chamber 4d and the hollow portion 5c constitute a blow-by gas passage. An annular valve seat 9 is sandwiched between the main housing 4 and the sub-housing 5. The valve seat 9 is formed of a heat transfer member (for example, metal) having a good heat transfer property. Corresponding to the valve seat 9, a valve body 10 is provided in the valve chamber 4d so as to be movable in the axial direction. The valve body 10 is formed in a rod shape from a magnetic material such as iron from the viewpoint of improving durability, and is provided so as to be able to penetrate the valve seat 9. The valve body 10 has a shape in which the tip portion has a diameter reduced stepwise. Accordingly, when the valve body 10 is moved and displaced in the axial direction, the size (opening degree) of the gap between the valve seat 9 and the valve body 10 changes. The gap between the valve seat 9 and the valve body 10 constitutes the gas flow rate adjusting unit 13 of the valve chamber 4d located at the other end in the axial direction of the valve chamber 4d.

  As for the valve body 10, the base end part, ie, the inlet side edge part located in the vicinity of the inlet 4e, makes the flange 10a. The flange 10a is provided so that its outer peripheral surface can slide on the inner peripheral surface of the valve chamber 4d. The flange 10a includes a notch that allows passage of blow-by gas in a part thereof. A compression spring 11 is provided between the valve seat 9 and the flange 10a. The spring 11 urges the valve body 10 toward the inlet 4e of the valve chamber 4d. The distal end portion of the valve body 10 is provided so as to penetrate the valve seat 9 and enter the hollow portion 5 c of the sub housing 5. In the hollow portion 5 c of the sub housing 5, another compression spring 12 is provided so as to be able to contact the tip of the valve body 10.

  In the state where the PCV valve 1 shown in FIG. 1 is attached to the engine main body, intake negative pressure acts on the hollow portion 5c of the sub-housing 5 from the intake system of the engine through a pipe during engine operation. The blow-by gas filled in the engine body enters the valve chamber 4d of the main housing 4 from the inlet 4e, and the gas pressure acts on the valve body 10. At this time, when the intake negative pressure and the gas pressure act on the valve body 10 against the biasing force of the spring 11, the valve body 10 moves in the axial direction toward the valve seat 9, and the valve seat 9 and the valve body 10, that is, the size of the gas flow rate adjusting unit 13 changes. As a result, the flow rate of the blow-by gas passing through the valve chamber 4d of the main housing 4 to the hollow portion 5c of the sub-housing 5 is adjusted. The movement of the valve body 10 is regulated by the front end of the valve body 10 coming into contact with the spring 12 in the hollow portion 5 c of the sub-housing 5. That is, the valve body 10 operates to adjust the blow-by gas flow rate.

  The above-described electric heater 6 is provided to heat at least the valve body 10 and the valve seat 9. Here, the configuration of the electric heater 6 will be described in detail. FIG. 2 is a plan view showing the electric heater 6. FIG. 3 is a cross-sectional view taken along line AA in FIG. FIG. 4 shows a front view of the electric heater 6. The electric heater 6 is provided inside the main housing 4. The electric heater 6 is provided on the large flange 21a and the coil 22 including a cylindrical bobbin 21 having large and small flanges 21a and 21b at both ends in the axial direction, a wire 22a wound around the outer periphery of the bobbin 21, and the wire 22a. A pair of connection terminals 23. The bobbin 21 is made of a nonmagnetic material. An example of the non-magnetic material is a resin. The coil 22 can generate heat when energized. The wire 22a of the coil 22 is formed of, for example, a nichrome wire or a copper nickel wire, and its diameter is, for example, “0.2 mm”. The base end portion of each connection terminal 23 is electrically connected to the coil 22. As shown in FIG. 1, the tip of each connection terminal 23 is disposed so as to protrude into the connector portion 4a.

  The electric heater 6 manufactured as described above is insert-molded with respect to the main housing 4. FIG. 5 is a plan view of the main housing 4 formed by cutting a mold or the like. FIG. 6 is a sectional view showing a method for forming the main housing 4. FIG. 7 is a side view showing a method for forming the connector portion 4a, in particular, by cutting the mold. That is, in order to resin-mold the main housing 4, the main part of the main housing 4 includes first and second molds 41 and 42 that are clamped and opened in the left-right direction (vertical direction in the drawing), and the main A third mold 43 that molds the male screw 4b of the housing 4 and the cores 44 of the molds 41 to 43 are used. For the connector portion 4a, in addition to the first and second molds 41 and 42, fourth and fifth molds 45 and 46 that can move obliquely are used. To resin-mold the main housing 4, as shown in FIG. 6, after the electric heater 6 prepared in advance is loaded as an insert between the molds 41 to 43, 45, 46 and the core 44. The molten resin 47 is injected into the cavity formed therein. Thereafter, the resin 47 is cooled, and the electric heater 6 is wrapped with the resin 47 and solidified. Thereafter, the first and second molds 41 and 42 are opened, and the third mold 43 is pulled apart while turning, and the core 44 is pulled out. Further, as shown in FIG. 7, the fourth and fifth molds 45 and 46 are opened from the connector portion 4a. Thereby, the main housing 4 as a composite part in which the electric heater 6 is integrated can be manufactured.

  Here, as shown in FIG. 1, the electric heater 6 is disposed at the center of the main housing 4, and the hollow 21 d of the bobbin 21 of the electric heater 6 constitutes most of the valve chamber 4 d of the main housing 4. is doing. Thereby, the inner peripheral surface of the bobbin 21 constitutes most of the inner peripheral surface of the valve chamber 4d. The valve seat 9 is included in the large flange 21a of the bobbin 21, and is integrally formed with the main housing 4 in a state where the valve seat 9 is in contact with the inner peripheral surface of the large flange 21a. Furthermore, the electric heater 6 is provided so as to surround the valve chamber 4d from the gas flow rate adjusting unit 13 to the vicinity of the inlet 4e. More specifically, as shown in FIG. 1, the electric heater 6 has at least the gas flow rate adjustment unit 13 to the flange 10 a of the valve body 10 in a state where the valve body 10 is disposed at the initial position by the biasing force of the spring 11. It is provided so as to surround the valve chamber 4d. That is, the electric heater 6 includes a cylindrical bobbin 21 made of a non-magnetic material and a coil 22 wound around the bobbin 21 and generating heat when energized, and the valve body 10 is disposed in the hollow 21d of the bobbin 21. Has been.

  An external connector (not shown) is connected to the connector portion 4a of the main housing 4 shown in FIG. The external connector is configured to be electrically connectable to the connection terminal 23. The external connector is connected to a controller (not shown) via an external wiring (not shown) in order to control the electric heater 6.

  FIG. 8 is an exploded sectional view of the PCV valve 1 described above. The PCV valve 1 of this embodiment is characterized in the configuration related to the housing 3. That is, in this embodiment, the housing 3 of the PCV valve 1 is constituted by the two members (two-body type) of the main housing 4 and the sub-housing 5 as described above. Further, the main housing 4 and the sub-housing 5 have a valve chamber 4d and a hollow portion 5c in the interior constituting a gas passage for blow-by gas. Further, the main housing 4 is provided with the electric heater 6 integrally formed in advance as described above, and the main housing 4 is provided with a connector portion 4a for supplying heating energy (electricity) to the electric heater 6. It is done. Since each connection terminal 23 protruding into the connector portion 4a is electrically connected directly to the coil 22 of the electric heater 6 between the connection terminals 23 and the electric heater 6, No electrical wiring connection is provided. The main housing 4 corresponds to the first housing of the present invention, the sub-housing 5 corresponds to the second housing of the present invention, and the connector portion 4a and the connection terminal 23 correspond to the external connection portion of the present invention.

  Further, in this embodiment, the main housing 4 includes from the inlet 4 e for introducing gas into the gas passage to the gas flow rate adjusting unit 13 by the valve body 10, and the sub-housing 5 is downstream from the gas flow rate adjusting unit 13. It is comprised including the hollow part 5c which is this gas passage.

  According to the PCV valve 1 of the present embodiment described above, the blow-by gas of the engine body 2 enters the valve chamber 4d from the inlet 4e of the main housing 4 and passes through the hollow portion 5c of the sub-housing 5 from the gas flow rate adjusting unit 13. To the outside. The outflow amount of blow-by gas from the gas flow rate control unit 13 is determined by the opening degree of the valve body 10 and the valve seat 9 moving in the valve chamber 4d. Here, the electric heater 6 is provided from the gas flow rate adjusting unit 13 to the vicinity of the inlet 4e, more specifically, from the gas flow rate adjusting unit 13 to the flange 10a of the valve body 10 so as to surround the valve chamber 4d. Accordingly, in addition to the valve seat 9 of the gas flow rate control unit 13 from which blow-by gas flows out, the valve body 10 and the spring 11 positioned in the valve chamber 4d are each warmed by the heat generated by the electric heater 6. Here, the valve body 10 moves in the axial direction in the valve chamber 4d, but most of the valve chamber 4d, which is the moving range of the valve body 10 and its flange 10a, is warmed by the electric heater 6, so that the moving valve body 10 can be reliably warmed by the electric heater 6. For this reason, in the PCV valve 1, the valve seat 9 can be effectively prevented from freezing, and the valve body 10 and the spring 11 can also be effectively prevented from freezing.

  According to this embodiment, since the electric heater 6 is assembled to the main housing 4 via the bobbin 21, the assemblability is improved. That is, there is no need to directly assemble the coil 22 as an electric heater to the main housing 4, and the electric heater 6 is integrally formed with the main housing 4 by insert molding the bobbin 21 with the coil 22 mounted on the main housing 4. Therefore, the electric heater 6 can be easily assembled to the main housing 4. For this reason, the productivity of the PCV valve 1 having the electric heater 6 can be improved. Further, since the bobbin 21 is made of a material having good heat conductivity, and the inner peripheral surface of the bobbin 21 constitutes most of the inner peripheral surface of the valve chamber 4d, the heat generated in the coil 22 is generated via the bobbin 21 in the valve chamber 4d. In this sense, the valve body 10 and the spring 11 are more easily warmed by the heat generated by the electric heater 6. For this reason, the freeze prevention effect of the valve seat 9, the valve body 10, and the spring 11 can be improved.

  Further, according to this embodiment, one end of the spring 11 provided in the valve chamber 4d is in contact with the valve seat 9 having good heat conductivity, and the bobbin 21 which is a part of the electric heater 6 is disposed around the valve seat 9. A large flange 21a is arranged. Further, the other end of the spring 11 contacts the flange 10 a of the valve body 10. Accordingly, the heat generated by the electric heater 6 is directly transmitted to the valve seat 9, further transmitted to the spring 11 through the valve seat 9, and transmitted to the flange 10 a of the valve body 10 through the spring 11. In this sense, the antifreezing effect of the valve seat 9 can be further improved, and in addition, the antifreezing effect of the spring 11, the valve body 10, and its flange 10a can be improved.

  In addition, in this embodiment, the main housing 4 constituting the housing 3 is provided with a valve chamber 4d constituting a gas passage, and the electric heater 6 is integrally formed in advance. Further, the main housing 4 is provided with a connection terminal 23 and a connector portion 4a for supplying electricity to the electric heater 6. Therefore, there is no need to provide a connection terminal or a connector for supplying electricity to the electric heater 6 in the sub housing 5 different from the main housing 4. For this reason, in order to supply electricity to the electric heater 6, it is necessary to provide a connecting portion for conducting electricity between the main housing 4 and the sub-housing 5 constituting the housing 3, that is, a connecting portion by wiring soldering or the like. In addition, the manufacture of the PCV valve 1 can be simplified, wiring connection failure can be prevented, and durability can be improved.

  Further, in this embodiment, the main housing 4 provided with the electric heater 6 includes the valve chamber 4d from the inlet 4e to the gas flow rate adjusting unit 13, so that the valve chamber 4d from the inlet 4e to the gas flow rate adjusting unit 13 is provided. And the valve body 10 can be heated by the electric heater 6. In this sense, it is possible to effectively heat the valve body 10 and the gas flow rate adjusting unit 13 which are the main parts of the PCV valve 1, and it is possible to effectively prevent the valve body 10 and the like from being frozen. Further, since the connector portion 4a is provided in the main housing 4 provided with the electric heater 6, the resin volume around the valve chamber 4d to be subject to freezing is increased by the amount of the connector portion 4a, and the heat receiving effect is increased by that amount. Will improve. In this sense, antifreezing performance can be improved.

  Furthermore, if this embodiment is twisted, the sub-housing 5 constituting the hollow portion 5c as the gas passage on the downstream side from the gas flow rate adjusting portion 13 is constituted by a member different from the main housing 4, so that the electric heater The sub-housing 5 can be commonly used even among models having different specifications for mounting to the engine 6 or the engine body. Specifically, even if various sizes and shapes on the side of the main housing 5 have to be prepared according to the heating capacity of the electric heater 6 and the shape or size of the engine body, the sub housing 5 is commonly used for general purposes. The two housings 3 can be dealt with only by changing the design of one of the main housings 4. For this reason, the common use of the sub-housing 5 can simplify the production of a plurality of types of PCV valves.

[Second Embodiment]
Next, a second embodiment in which the PCV valve of the present invention is embodied will be described in detail with reference to the drawings.

  In the following description, the same components as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and different points will be described.

  The PCV valve 51 of this embodiment is different from the PCV valve 1 of the first embodiment in the configuration related to the housing 52. FIG. 9 is a sectional view showing the PCV valve 51 of this embodiment. FIG. 10 is an exploded sectional view of the PCV valve 51. In the PCV valve 51 of this embodiment, a plurality of members constituting the housing 52 constitute a gas passage, and a main housing 54 as a first housing provided with an electric heater portion 53 corresponding to the heating means of the present invention, And an inlet plug 55 as a second housing assembled to the main housing 54. In the housing 52, the valve body 10 etc. which operate | moves for gas flow rate adjustment are accommodated. The electric heater 53 is provided in the main housing 54 in order to heat the valve seat 9, the valve body 10 and the spring 11. Here, in the PCV valve 51, the main housing 54 is molded by a plurality of members 56, 57, and the valve seat 9, the valve body 10, and the springs 11, 12 are incorporated into the molded main housing 54, and the main housing 54 is incorporated therein. The valve seat 9, the valve body 10, and the springs 11 and 12 are manufactured by a method in which an inlet plug 55 is assembled to the main housing 54 so as to be sealed in the main housing 54.

  The main housing 54 described above constitutes most of the housing 52, and the inlet plug 55 is fixed to one end opening 54a of the valve chamber 58 of the main housing 54 by press-fitting or welding. The main housing 54 is formed by molding the first member 56 and the second member 57 with each other. The first member 56 has a shape and a structure in which the sub housing 5 and the electric heater 6 of the first embodiment are integrated. That is, a pipe joint 56a is provided at one end portion (left side of the drawing) of the first member 56, and an electric heater portion 53 is provided at the other end portion. The electric heater 53 is formed by providing the coil 22 on the outer periphery of the first member 56. The first member 56 is provided with a connection terminal 23 that is electrically connected to the coil 22. The 2nd member 57 has the shape and structure according to the main housing 4 of 1st Embodiment. However, the inlet 4e is not integrally formed at one end opening of the second member 57 (one end opening 54a of the main housing 54) as in the first embodiment. Instead, an inlet 55a of the PCV valve 51 is formed in the center of the inlet plug 55.

  FIG. 11 is a sectional view showing a method for forming the first member 56. The first member 56 is entirely resin-molded, and has a pipe joint 56a formed at one end (left side in the drawing) and a structure for the electric heater 53 at the other end (right side in the drawing). The valve seat 9 is press-fitted into the valve chamber 58 of the first member 56. And in order to form the recessed part 56b for winding the coil 22 of the electric heater part 53 around the other end part outer periphery of the 1st member 56, and to fix the press-fitted valve seat 9, as shown in FIG. The outer periphery of the other end of the first member 56 is pressed by a pair of pressing dies 71 and 72. Thereafter, the coil 22 is wound around the recess 56 b and the connection terminal 23 is connected to the coil 22. In this way, the first member 56 is formed. The main housing 54 is formed by insert molding the second member 57 using the first member 56 thus formed as an insert product by resin molding.

  In addition, a hollow portion 59 communicating with the valve chamber 58 is formed at one end portion of the first member 56. A connector portion 57 a that encloses the connection terminal 23 is formed on the second member 57. The other end of the second member 57 is provided with a male screw 57b. Further, a gas flow rate adjusting unit 13 is provided between the valve seat 9 and the valve body 10.

  Therefore, according to the PCV valve 51 of this embodiment, the housing 52 is configured by assembling the inlet plug 55 to the main housing 54 in which the valve seat 9, the valve body 10 and the springs 11 and 12 are enclosed, and the main housing 54 is configured. An electric heater unit 53 is provided. Therefore, it is not necessary to provide the connection plug and the connector part for supplying electricity to the electric heater part 53 in the inlet plug 55. For this reason, it is not necessary to provide a wiring connection portion for conducting electricity between the main housing 54 and the inlet plug 55 constituting the housing 52 in order to supply electricity to the electric heater portion 53, and the PCV valve 51 Manufacturing can be simplified, poor connection of wiring can be prevented, and durability can be improved. The other effects related to the prevention of freezing by the electric heater 53 are the same as those of the PCV valve 1 of the first embodiment.

  The present invention is not limited to the above-described embodiments, and can be carried out as follows without departing from the spirit of the invention.

  (1) In each of the above embodiments, the electric heater 6 and the electric heater portion 53 are provided as heating means, and electricity is supplied to the members 6 and 53 as energy, but energy other than electricity is used as the heating means. It is good also as a structure which receives and operate | moves. For example, the heating means may be a heater that operates with a heating fluid, and heat as energy may be supplied to the heater with the heating fluid.

  (2) In each of the above embodiments, the valve body 10 is made of a magnetic material, but the valve body may be made of a non-magnetic material such as SUS or resin. In this case, the coil generates a magnetic force when energized. However, since the valve body is made of a non-magnetic material, the valve body is not affected by the generated magnetic force of the coil. In this sense, it is possible to prevent the adjustment function of the gas flow rate from being impaired due to the influence of the magnetic force generated by the coil when the electric heater or the electric heater unit is operated.

  (3) In the first embodiment, the inner peripheral surface of the bobbin 21 constituting the electric heater 6 constitutes a part of the inner peripheral surface of the valve chamber 4d. In the second embodiment, the electric heater portion 53 is provided. The inner peripheral surface of the first member 56 constituting the part of the inner peripheral surface of the valve chamber 58 is configured to be a part of the inner peripheral surface of the valve chamber 58, but an electric heater or an electric heater portion is embedded in the housing so as to surround the valve chamber. You may make it a heater or an electric heater part not comprise the internal peripheral surface of a valve chamber.

  (4) In the first embodiment, the housing 3, that is, the PCV valve 1 is attached to the engine body by tightening the male screw 4 b of the main housing 4 to the female screw of the mounting hole of the engine body. The attachment method to the main body may be another method, for example, a method using a quick connector or a snap fit.

Sectional drawing which shows a PCV valve | bulb. The top view which shows an electric heater. FIG. 3 is a sectional view taken along line AA in FIG. 2. The front view which shows an electric heater. The top view which cut | disconnects and shows a metal mold | die etc. about the formation method of a main housing. Sectional drawing which shows the shaping | molding method of a main housing. The side view which cuts and shows a metal mold | die about the formation method of a connector part. The exploded sectional view showing a PCV valve. Sectional drawing which shows a PCV valve | bulb. The exploded sectional view showing a PCV valve. Sectional drawing which shows the shaping | molding method of a 1st member.

Explanation of symbols

1 PCV valve 3 Housing 4 Main housing (first housing)
4a Connector part (external connection part)
4d Valve chamber (gas passage)
4e Inlet 5 Sub housing (second housing)
5c Hollow part (gas passage)
6 Electric heater (heating means)
10 Valve body 13 Gas flow control part 23 Connection terminal (external connection part)
51 PCV valve 52 Housing 53 Electric heater (heating means)
54 Main housing (first housing)
55 Inlet plug (second housing)
55a Inlet 56 First member 57 Second member 58 Valve chamber (gas passage)
59 Hollow part (gas passage)

Claims (4)

A housing comprising a plurality of members and constituting a gas passage;
A valve body housed in the housing and operated to adjust a gas flow rate;
In a PCV valve comprising at least a heating means for heating the valve body,
The plurality of members constituting the housing includes a first housing which constitutes the gas passage and is provided with the heating means, and the first housing has an external connection part for supplying energy to the heating means. A PCV valve characterized by being provided. 2. The PCV valve according to claim 1, wherein the first housing includes from an inlet for introducing gas into the gas passage to a gas flow rate adjusting unit by the valve body. 3. The PCV valve according to claim 2, wherein the plurality of members constituting the housing further includes a second housing, and the second housing constitutes a gas passage downstream from the gas flow rate adjusting unit. A housing comprising a plurality of members and constituting a gas passage;
A valve body housed in the housing and operated to adjust a gas flow rate;
Heating means for heating at least the valve body;
A plurality of members constituting the housing includes a first housing which constitutes the gas passage and is provided with the heating means, and a second housing which is assembled to the first housing. A manufacturing method comprising:
The first housing is molded, and at least the valve body is incorporated in the molded first housing, and the at least the incorporated valve body is sealed in the first housing. 2. A method of manufacturing a PCV valve, comprising assembling a housing.

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