JP2004162607A - Valve with grommet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a valve with a grommet mounted to a mounting hole of a mounted member in a single operation. <P>SOLUTION: A valve element 90 is stored in a valve housing 60 cylindrical as a whole, and a connecting pipe part 80 to which fluid piping is connected, is connected to one end of the valve housing 60, while the other end of the valve housing 60 is provided with an opening part 62 opened/closed by the valve element 90. The grommet 110 is mounted to the outer periphery of the valve housing 60, and the tip part 111 of the grommet 110 is extended onto the inner diameter side to enfold the end part on the opening part 62 side of the valve housing 60. A projecting part 64 is circumferentially formed at a part positioned at the inner periphery of the grommet 110 at the outer periphery of the valve housing 60, and a step part 115 engaged with the projecting part 64 of the valve housing 60 is formed at the inner periphery of the grommet 110. A cavity 116 is provided between the outer periphery of the valve housing 60 and the inner periphery of the grommet 110 on the opening part 62 side rather than the projecting part 64. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a grommet-equipped valve that can be hermetically attached to the inner periphery of a mounting hole simply by being inserted into the mounting hole of the mounted member.
[0002]
[Prior art]
In general, automobiles are reburned without releasing blow-by gas from the engine to the outside. Therefore, the blow-by gas in the engine crankcase is returned to the intake manifold through the crankcase ventilation valve.
[0003]
As such a crankcase ventilation valve, Japanese Patent Application Laid-Open No. 7-127424 discloses a crankcase ventilation valve which is inserted between a crankcase of a vehicle engine and an intake manifold and is operated by a negative pressure of the intake manifold from the normal operation during idling. In a crankcase ventilation valve having a valve with a smaller opening area, a second valve having a larger opening area when the vehicle decelerates, which generates a larger negative pressure than when idling, and the second valve are always attached in the closing direction. A crankcase ventilation valve is disclosed that includes a biasing spring.
[0004]
By the way, such a valve is mounted by inserting the valve into a mounting hole formed in, for example, a cylinder head cover of an engine via a grommet formed of synthetic rubber or the like.
[0005]
FIG. 7 shows an example of such a conventional valve with a grommet.
As shown in FIG. 1A, this valve includes a valve body 10 having a tubular valve housing 11 that houses a valve body 20 and a connecting pipe portion 12 that is connected to the rear end of the valve housing 11. It has. The valve housing 11 has an opening 13 at the tip, a tapered portion 16 is provided on the outer periphery of the tip, and an annular convex portion 17 is formed on the top of the tapered portion 16. Further, a diameter-expanded portion 14 having a diameter increased in a flange shape is provided at the rear end, and a flange portion 15 formed at the proximal end of the connecting pipe portion 12 is inserted and welded to the diameter-expanded portion 14.
[0006]
The valve body 20 is connected to a valve head 21 made of synthetic rubber or the like that opens and closes the opening 13 from the inside, and a rear portion of the valve head 21, and a plurality of outer peripheral portions extend in the outer diameter direction. The flange portion 22 is slidably in contact with the inner periphery of the valve housing 11, and the guide shaft 23 extends axially from the rear portion of the flange portion 22 and is slidably inserted into the connecting pipe portion 12. ing. On the outer periphery of the guide shaft 23, a spring 24 whose one end is in contact with the flange portion 22 and whose other end is in contact with the distal end portion of the connecting pipe portion 12 is mounted. It is energized in the direction of closing.
[0007]
The tip of the valve housing 11 is inserted into a grommet 30 made of synthetic rubber or the like. The grommet 30 has a tubular shape as a whole, a tapered portion 31 is provided on the outer periphery of the tip portion, and an annular convex portion 32 is provided on the top of the tapered portion 31. Further, a flange 33 is provided at the rear end portion, and an annular recess 34 is formed between the projection 32 and the flange 33. Further, a portion corresponding to the tapered portion 31 is slightly enlarged in diameter on the inner periphery, and a step portion 35 is provided between the inner periphery and the inner periphery on the rear end side.
[0008]
When the valve is mounted, as shown in FIG. 5B, the grommet 30 is inserted in advance into a mounting hole 41 provided in a mounted member 40 made of, for example, an engine cylinder head cover, and the mounting hole. The grommet 30 is attached by fitting the inner periphery of 41 to the annular recess 34 of the grommet 30.
[0009]
Next, as shown in FIG. 2C, the valve body 10 is inserted into the grommet 30 from the tapered portion 16 side and pushed until the diameter-expanded portion 14 contacts the flange 33 of the grommet 30. The valve body 10 is mounted in the mounting hole 31 of the mounted member 40 through the grommet 30.
[0010]
[Patent Document 1]
JP-A-7-127424 [0011]
[Problems to be solved by the invention]
However, the conventional valve shown in FIG. 7 requires a two-step process, that is, a process of inserting and attaching the grommet 30 into the mounting hole 41 and a process of inserting and installing the valve body 10 in the grommet 30. Therefore, there was a problem that the installation workability was poor and it took time.
[0012]
Accordingly, an object of the present invention is to provide a valve with a grommet that can be mounted in a mounting hole of a mounted member by a single operation.
[0013]
[Means for Solving the Problems]
In order to achieve the above object, according to a first aspect of the present invention, a valve body is housed inside, a connecting pipe portion connected to a fluid pipe is connected to one end, and the other end is opened and closed by the valve body. A generally cylindrical valve housing provided with an opening;
A grommet that is attached to the outer periphery of the end portion on the opening side of the valve housing and seals the gap between the valve housing and the mounting hole when inserted into the mounting hole of the mounted member;
A convex portion formed along the circumferential direction is formed in a portion located on the inner periphery of the grommet on the outer periphery of the valve housing,
One end of the grommet is extended to the inner diameter side so as to wind up the end of the valve housing on the opening side, and the inner periphery of the grommet is provided on the convex portion of the valve housing. A stepped portion that is engaged from the connecting pipe portion side of the valve housing is formed,
A grommet-equipped valve is provided in which a gap is provided between the outer periphery of the valve housing and the inner periphery of the grommet on the opening side of the convex portion.
[0014]
According to the above invention, when the grommet is attached to the outer periphery of the valve housing and inserted into the mounting hole from the tip end side of the grommet, the gap formed between the outer periphery of the valve housing and the inner periphery of the grommet is crushed and the grommet is removed. The diameter is reduced, so that the grommet can be inserted into the mounting hole with the valve housing inserted. At this time, since the end portion of the grommet is extended toward the inner diameter side so as to wind the end portion on the opening side of the valve housing, the valve housing does not protrude from the tip end of the grommet.
[0015]
When the grommet is fitted into the mounting hole, the convex portion on the outer periphery of the valve housing is engaged with the step on the inner periphery of the grommet, so that the valve housing is prevented from coming off from the grommet. Accordingly, when the grommet is mounted on the valve housing, the valve can be mounted by one operation by inserting both into the mounting hole, and the workability can be greatly improved.
[0016]
A second aspect of the present invention is the valve with a grommet according to the first aspect, wherein the convex portion of the valve housing is disposed so as to be positioned on an inner periphery of the mounting hole in a state of being inserted into the mounting hole. Is to provide.
[0017]
According to the above invention, when the valve housing is inserted into the mounting hole with the grommet mounted, the convex portion of the valve housing is located on the inner periphery of the mounting hole, so that the grommet is connected to the convex portion and the inner periphery of the mounting hole. As a result, the hermetic sealing becomes better.
[0018]
According to a third aspect of the present invention, there is provided the valve with a grommet according to the first or second aspect of the invention, wherein a rib projecting in an outer diameter direction is formed on an end surface of the valve housing on the opening side. is there.
[0019]
According to the invention, when the grommet is inserted into the valve housing and inserted into the mounting hole, the end face of the tip opening of the valve housing is widened by the rib, so the end face of the valve housing bites into the grommet. Can be prevented from tearing. Further, since the rib extrudes the outer periphery of the tip end of the grommet to the outer diameter side, even if a gap is provided between the valve housing outer periphery and the grommet inner periphery, the grommet is inserted after the grommet is inserted into the mounting hole. Can be returned to the outer diameter side and closely attached to the mounting hole.
[0020]
According to a fourth aspect of the present invention, in any one of the first to third aspects, a flange portion is formed on the connecting pipe portion side of the valve housing, and a rear end portion of the grommet is formed on the flange portion. A valve with a grommet arranged at a predetermined interval is provided.
[0021]
According to the above invention, when the grommet is inserted into the valve housing with the grommet mounted on the valve housing, the rear end of the grommet is not affected even if the outer periphery of the tip of the grommet hits the inner periphery of the mounting hole and the grommet is extended in the axial direction. Since a predetermined gap is provided between the flange portion of the valve housing and the flange portion of the valve housing, the rear end portion of the grommet is allowed to extend rearward, and the thickness of the grommet can be reduced to easily pass through the mounting hole. can do.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
1 to 5 show an embodiment of a valve with a grommet according to the present invention. 1 is a perspective view of the valve, FIG. 2 is an exploded perspective view of the valve, FIG. 3 is a longitudinal sectional view of the valve, and FIG. 4 is a perspective view showing an example of a mounted member to which the valve is applied. FIG. 6 is a cross-sectional view showing the mounting process of the valve.
[0023]
As shown in FIGS. 1 to 3, the valve 50 with a grommet is accommodated in the valve housing 60 as a whole, a valve housing 60 that is cylindrical, a connecting pipe portion 80 that is connected to one end of the valve housing 60, and the valve housing 60. A valve body 90, a spring 100 for biasing the valve body 90, and a grommet 110 attached to the outer periphery of the valve housing 60.
[0024]
The valve housing 60 is made of a heat-resistant resin such as polybutylene terephthalate, and has a rib 61 that protrudes to the outer diameter side at the tip. A partition wall 63 having an opening 62 at the center is formed on the inner periphery of the tip. An annular convex portion 64 is formed at the center of the outer periphery of the valve housing 60, and an annular concave portion 65 is provided between the rib 61. Further, a flange portion 66 is formed on the outer periphery of the rear end portion, and an enlarged diameter cylindrical portion 67 extends from the rear end surface of the flange portion 66.
[0025]
The connecting pipe portion 80 includes a plurality of annular convex portions 81 formed at predetermined intervals in the axial direction, and an insertion pipe portion 82 having a sawtooth shape in cross section along the axial direction, and an outer side from the base of the insertion pipe portion 82. A flange portion 83 that extends in the axial direction, an enlarged diameter cylindrical portion 84 that extends in the axial direction from the outer periphery of the flange portion 83, and a rib 85 that protrudes in an annular shape at the inner center of the flange portion 83. . A passage 86 of the insertion tube portion 82 is opened at the inner peripheral base portion of the rib 85, and a step portion 87 that receives one end of the spring 100 is formed at the periphery of the opening portion.
[0026]
The connecting pipe portion 80 is joined to the valve housing 60 by placing the enlarged diameter cylindrical portion 84 on the outer periphery of the enlarged diameter cylindrical portion 67 of the valve housing 60 and welding the contact surfaces thereof. Prior to this joining, a valve body 90 and a spring 100 described later are accommodated in the valve housing 60.
[0027]
The valve body 90 is preferably composed of a valve head 91 fitted with synthetic rubber or the like, a flange portion 92 extending in an outer diameter method adjacent to the valve head 91, and a shaft from the rear center of the flange portion 92. It has a shaft portion 93 that extends in the direction and is inserted into the insertion tube portion 82 at its distal end. As shown in FIG. 2, the flange portion 92 protrudes at three locations on the outer periphery and is in sliding contact with the inner periphery of the valve housing 60. In other portions, a fluid flow path is formed between the flange portion 92 and the inner periphery of the valve housing 60. It is supposed to be formed.
[0028]
A spring 100 is mounted on the outer periphery of the shaft portion 93 of the valve body 90. One end of the spring 100 abuts on the flange portion 92, and the other end is a rib of the connecting pipe portion 80 as described above. It is inserted into 85 and is in contact with the stepped portion 87. In this embodiment, the spring 100 is composed of a compression coil spring, and constantly biases the valve body 90 toward the opening 62.
[0029]
The grommet 110 is made of an elastic resin material such as synthetic rubber, and has a cylindrical shape as a whole so as to cover the outer periphery of the valve housing 60. The tip 111 of the grommet 110 is formed in a U-shaped cross section so as to bend toward the inner diameter side and wind the rib 61 of the valve housing 60. In addition, an annular convex portion 113 is formed on the outer periphery of the tip portion 111 via a tapered portion 112. Further, a flange portion 114 is formed at the rear end portion of the grommet 110, and an annular recess 115 is formed between the convex portion 113 and the flange portion 114.
[0030]
Further, a stepped portion 117 is provided on the inner periphery of the grommet 110 to engage with the convex portion 64 formed on the outer periphery of the valve housing 60. A gap 116 is formed between the annular recess 65 of the valve housing 60 and the inner periphery of the grommet 110.
[0031]
Next, a method for attaching the valve 50 with grommet will be described.
FIG. 4 shows a cylinder head cover 120 of an engine as an example of a member to which the valve 50 with grommet is applied. A mounting hole 121 for mounting the valve 50 with grommet is formed in the cylinder head cover 120. The valve 50 with grommet can be easily mounted by pushing it into the mounting hole 121.
[0032]
As shown in FIG. 5A, when the valve 50 with grommet is mounted, the grommet 110 is mounted on the valve housing 60 in advance.
[0033]
Then, as shown in FIG. 5B, the grommet 110 is inserted into the mounting hole 121 of the cylinder head cover 120 from the front end side. Then, the tapered portion 112 of the grommet 110 is pressed against the inner periphery of the mounting hole 121, and the grommet 110 extends in the axial direction and becomes thin. At this time, since the gap is provided between the flange portion 114 at the rear end of the grommet 110 and the flange portion 66 at the rear end of the valve housing 60 (see FIG. 5A), the grommet 110 extends in the axial direction. Will not be disturbed.
[0034]
As the tapered portion 112 passes through the attachment hole 121, the convex portion 113 at the top of the tapered portion 121 enters the inner periphery of the attachment hole 121. At this time, since the gap 116 is provided between the inner periphery corresponding to the convex portion 113 of the grommet 110 and the outer periphery of the valve housing 60, the convex portion 113 can easily enter when the gap 116 is crushed. Can be done.
[0035]
Thus, when the convex portion 113 of the grommet 110 passes through the attachment hole 121, the inner periphery of the attachment hole 121 is formed between the convex portion 113 of the grommet 110 and the flange portion 114, as shown in FIG. The annular recess 115 is fitted. At this time, since the convex portion 64 of the valve housing 60 is located on the inner periphery of the mounting hole 121, the cylindrical wall portion of the grommet 110 is sandwiched between the convex portion 64 and the inner periphery of the mounting hole 121, and is airtight. Sealability is improved.
[0036]
When the air pressure in the cylinder head cover 120 exceeds a predetermined value, the valve body 90 slides in the direction of the connecting pipe 80 against the biasing force of the spring 100 and the opening 62 opens. The gas in the cylinder head cover 12 flows out from the opening 62 through the connection pipe 80.
[0037]
FIG. 6 shows another embodiment of the valve with a grommet according to the present invention. It should be noted that substantially the same parts as those of the above-described embodiment are denoted by the same reference numerals and description thereof is omitted.
[0038]
The grommet-equipped valve 51 includes a valve housing 60, a connecting pipe portion 80, and a grommet 110 as in the above-described embodiment, and these structures are basically the same as those in the above-described embodiment. .
[0039]
However, the grommet valve 51 is different from the above embodiment in that an umbrella-type valve is used as a valve body instead of a slide valve. That is, a valve mounting portion 71 is provided in the opening 62 formed in the center of the partition wall 63 of the valve housing 60 via the spoke portion 70, and a valve body is formed in the hole 72 formed in the center of the valve mounting portion 71. 94 shaft portions 95 are inserted and fixed from the connecting tube portion 80 side. In addition, an umbrella-shaped seal portion 96 is continuously provided at the end portion of the shaft portion 95 on the connection pipe portion 80 side. The seal portion 96 has a substantially circular shape when viewed in the axial direction, and extends in a flange shape and a taper shape with respect to the shaft portion 95, and its peripheral edge is elastically pressed against the partition wall 63 at the peripheral edge of the opening 62. .
[0040]
Therefore, in the valve 51 with grommet, for example, when attached to the cylinder head cover of the engine, when the atmospheric pressure in the cover exceeds a predetermined value, the seal portion 96 is turned up, and a gap is generated between the partition wall 63 and the grommet-equipped valve 51. The gas in the cylinder head cover can be discharged from the opening 62 through the gap.
[0041]
【The invention's effect】
As described above, according to the present invention, with the grommet mounted on the valve housing, it is possible to mount the valve in one operation by inserting both into the mounting hole and greatly improving workability. Can be improved.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of a valve with a grommet according to the present invention.
FIG. 2 is an exploded perspective view of the valve.
FIG. 3 is a longitudinal sectional view of the valve.
FIG. 4 is a perspective view showing an example of a mounted member to which the valve is applied.
FIG. 5 is a cross-sectional view showing a mounting process of the valve.
FIG. 6 is a longitudinal sectional view showing another embodiment of the valve with grommet according to the present invention.
FIG. 7 is a cross-sectional view showing an example of a conventional valve with a grommet.
[Explanation of symbols]
50, 51 Valve 60 with grommet Valve housing 61 Rib 62 Opening 63 Partition 64 Protrusion 65 Concavity 80 Connection pipe part 82 Insertion pipe part 83 Flange part 90, 94 Valve body 91 Valve head part 92 Flange part 93 Shaft part 95 Shaft part 96 Seal part 110 Grommet 111 Tip part 112 Tapered part 113 Annular convex part 114 Flange part 115 Annular concave part

Claims (4)

A tubular valve housing as a whole, in which a valve body is housed, a connection pipe portion to which a fluid pipe is connected is provided at one end, and an opening that is opened and closed by the valve body is provided at the other end. When,
A grommet that is attached to the outer periphery of the end of the valve housing on the opening side and is inserted into the mounting hole of the mounted member, and seals a gap between the valve housing and the mounting hole;
A convex portion formed along the circumferential direction is formed in a portion located on the inner periphery of the grommet on the outer periphery of the valve housing,
One end of the grommet is extended to the inner diameter side so as to wind up the end of the valve housing on the opening side, and the inner periphery of the grommet is formed on the convex portion of the valve housing. A stepped portion that is engaged from the connecting pipe portion side of the valve housing is formed,
A valve with a grommet, wherein a gap is provided between the outer periphery of the valve housing and the inner periphery of the grommet on the opening side of the convex portion. The valve with a grommet according to claim 1, wherein the convex portion of the valve housing is arranged so as to be positioned on an inner periphery of the mounting hole in a state of being inserted into the mounting hole. The valve with a grommet according to claim 1 or 2, wherein a rib protruding in an outer diameter direction is formed on an end face of the valve housing on the opening side. The flange part is formed in the said connecting pipe part side of the said valve housing, The rear-end part of the said grommet is arrange | positioned with a predetermined space | interval with respect to the said flange part. The valve with a grommet as described in any one.

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