JP2000220432A - Pcv valve device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a PCV valve device that can be modified from an I-type pipe specification to an L-type pipe specification easily and realize compatibility of prescribed tightening torque and the piping direction even in the L-type pipe specification. SOLUTION: A tapered male screw 6 is formed on the outer circumference of the upper stream side of a PCV valve 1 and I-type pipe part 5 for connection of a linear piping hose along a shaft core of the PCV valve 1 is formed on the lower stream side. A curved L-type pipe 20 is installed separately from the PCV valve. One curved part of the L-type pipe 20 is made to be an engaging side part 20a possible to be engaged to the I-type pipe part 5, and the other curved part is made to be a piping hose connecting side part 20b. The engaging side part 20a of I-type pipe part 5 and L-type pipe 20 is provided with a coming- off stopping measure in each side under engaged state and is constructed so that the rotation can be made and the seal between them can be held.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a PCV for an internal combustion engine.
(Positive Crankcase Ventilation) Related to a valve device.

[0002]

2. Description of the Related Art Conventionally, in an automobile engine, a blow-by gas recirculation device for recirculating blow-by gas in a crankcase to an intake system such as an intake manifold through a recirculation path and re-combusting the same is known. In such a blow-by gas recirculation device, a PCV valve that controls the amount of recirculation to the intake system according to the amount of blow-by gas without impairing the operation of the engine is used.

As such a PCV valve, FIG.
As shown in FIG. 3, the inflow side pipe body 101 and the outflow side pipe body 102 are integrally fixed, and the inflow side pipe body 101 accommodates the valve body 103 and the valve portion 104 is provided on the inflow side of the valve body 103. Is formed, and a coil spring 105 is interposed between the valve portion 104 and the outflow side pipe body 102,
A PCV valve 100 is constructed, and such a PCV valve 100 is screwed to a cylinder head cover 107 of an engine by a taper screw 106 formed on an inflow side pipe body 101, and a piping hose 108 is connected to an outflow side pipe body 102. When the negative pressure on the intake system side is high, the valve body 103 moves to the downstream side against the urging force of the coil spring 105, and blow-by occurs due to the annular clearance between the valve body 103 and the flow control unit 109. In the case where the flow rate of the gas is reduced and the flow rate of the blow-by gas is increased when the negative pressure on the intake system side is low, the state shown in FIG.
No. 0-47032.

[0004]

However, depending on the engine, the outlet pipe body 102 may be straightened as shown in FIG.
I-type pipe specification, which is installed in a straight line, and the outflow side pipe 1
There is an L-shaped pipe specification in which the pipe hose 108 is bent in a substantially L shape so that the pipe hose 108 is piped substantially orthogonally to the PCV valve 100.

[0005] As shown in FIG.
Is formed integrally with the I-type pipe specification,
To use the L-shaped pipe as described above, the entire PCV valve must be changed to an L-shaped pipe.

In the case where the PCV valve 100 is screwed to the cylinder head cover 107 with a taper screw 106 as shown in FIG.
It is difficult to achieve both the set value of the tightening torque of the CV valve with respect to the cylinder head cover 107 and the bending direction of the outflow-side pipe body (the connection direction with the piping hose). That is,
When the connection torque with the piping hose is adjusted, the specified torque is not reached, and the attachment of the PCV valve may be loosened.

Therefore, it is also difficult to change the PCV valve 100 of the I-type pipe shown in FIG. 5 to the L-type pipe. Accordingly, the present invention provides a method of fixing a PCV valve to a cylinder head cover or the like with a tapered screw as described above. In the present invention, it is possible to easily change from an I-type pipe specification to an L-type pipe specification. It is another object of the present invention to provide a PCV valve device capable of achieving both the tightening torque and the piping direction.

[0008]

According to a first aspect of the present invention, a tapered external thread is formed on the outer periphery of an upstream side of a PCV valve, and a shaft center of the PCV valve is formed on a downstream side. L is formed separately from the PCV valve by forming an I-shaped pipe portion for connecting a straight piping hose along
A pipe is provided, and one bent portion of the L-shaped pipe is
The fitting side portion that can be fitted to the mold pipe portion, the other bent portion is the piping hose connection side portion, and the I-type pipe portion and the fitting side portion of the L-type pipe are fitted in these fitted states. A PCV valve device characterized in that it is configured such that mutual prevention is performed and that it is rotatable and that a seal between them is maintained.

Further, a second invention according to claim 2 is a PC
A taper male screw is formed on the outer periphery on the upstream side of the V-valve, and an I-shaped pipe portion for connecting a straight piping hose along the axis of the PCV valve is formed on the downstream side, and is bent separately from the PCV valve. An L-shaped pipe is provided, one bent portion of the L-shaped pipe is a fitting side portion that can be fitted to the I-shaped pipe portion, and the other bent portion is a piping hose connection side portion, A locking portion is formed over the entire circumference of the upstream side portion,
An engaging claw that is rotatably engaged with the engaging portion is formed on an inner periphery of the fitting side portion of the L-shaped pipe, and further, the fitting side portion is provided on an inner surface of the fitting side portion of the L-shaped pipe. And a seal member for rotatably sealing between these when fitted to the I-shaped pipe.

In the present invention, the PCV valve is screwed to the cinder head cover by tightening the tapered male screw to the tapered female screw formed in the cylinder head cover without using an L-shaped pipe formed separately from the PCV valve. And by connecting a piping hose to the I-type pipe portion of the PCV valve, it is possible to cope with the I-type pipe specification.

When the fitting side of the L-shaped pipe is fitted to the I-shaped pipe of the PCV valve screwed to the cylinder head cover as described above, the piping hose connection side of the L-shaped pipe is connected to the PCV valve. It is arranged in a direction bent with respect to the axis, and can be adapted to the L-shaped pipe specification by connecting a piping hose to the piping hose connection side. At this time, since the PCV valve and the L-shaped pipe are rotatable, the PCV valve is tightened with a predetermined torque, and the L-shaped pipe is rotated such that the pipe hose connection side is directed toward the pipe hose. As a result, it is possible to achieve both the tightening of the PCV valve with a predetermined torque and the L-shaped pipe specification.

Furthermore, since the fitting portion between the L-shaped pipe and the I-shaped pipe portion is rotatably sealed, there is no leakage of blow-by gas from the fitting portion.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described with reference to the embodiments shown in FIGS.

The PCV valve 1 has a mounting portion 3 for mounting to the cylinder head cover 2 located on the upstream side (blow-by gas inlet side), a two-width portion 4 for rotation located on the downstream side, and a downstream portion. And a straight I-shaped pipe portion 5 located on the side, which is integrally formed concentrically.

The outer peripheral surface of the mounting portion 3 has a tapered male screw 6
Is formed, and can be screwed to the tapered female screw 7 formed in the cylinder head cover 2. As shown in FIG. 2, the outer surface of the two-sided width portion 4 is formed in a polygonal shape, for example, a hexagonal surface, and the jig is fitted to the portion 4 so that the PCV valve 1 can be easily rotated. The I-type pipe section 5
An engaging portion 8 is formed on the entire outer periphery on the upstream side. The locking portion 8 is formed by a projection having a tapered surface 8a that expands toward the upstream side, that is, toward the two-face width portion 4 in the example of the drawing. Further, on the downstream side of the outer periphery of the I-shaped pipe section 5, an enlarged diameter section 9 for engaging a pipe hose is provided.
In addition, a tapered surface 10 is formed to reduce the diameter from the enlarged diameter portion 9 toward the upstream end, and a seal member fitting surface 11 is formed between the locking portion 8 and the enlarged diameter portion 9.

Further, a valve chamber 13 having an inflow port 12 at an upstream end is formed in an interior extending between the mounting portion 3 and the two-plane width portion 4 so as to penetrate in the axial direction. Further, a flow control unit 14 having a smaller diameter than the inner diameter of the valve chamber 13 penetrates the inside of the I-shaped pipe unit 5 in the axial direction.
An outflow passage 15 having a diameter slightly larger than that of the flow control unit 14 is formed in the downstream side of the flow control unit 14 in the axial direction.
6 are formed.

A valve body 17 is housed in the valve chamber 13 so as to be movable in the axial direction, and a spring 18 for urging the valve body 17 to the upstream side is housed therein. As a result, the valve element 17 moves to the upstream side, and the tapered measuring section 17a and the flow control section 14
As the annular gap increases, the valve body 17 moves downstream against the spring 18 as the intake system negative pressure increases,
The annular gap is reduced.

A buffer spring 19 is accommodated on the downstream side of the outflow passage 15. When the valve body 17 is strongly sucked by the negative intake air pressure against the spring 18, the tip of the valve body 17 is buffered. It is buffered by contacting the spring 19 so as not to directly contact the I-shaped pipe portion 5.

An L-shaped pipe 20 formed separately from the PCV valve 1 is fitted around the outer periphery of the I-shaped pipe portion 5. The L-shaped pipe 20 is bent at a substantially right angle, and one bent portion of the L-shaped pipe 20, that is, the fitting side portion 2
0a is fitted to the I-shaped pipe 5 part. The other bent side is a pipe hose connection side portion 20b.

On the inner side of the distal end of the fitting side portion 20a, there is formed a locking claw 21 which is locked to the upstream side surface 8a of the locking portion 8, that is, has a diameter smaller than the outer diameter of the locking portion 8. It is rotatable in the circumferential direction when stopped. Further, slits 21a as shown in FIG. 1 are formed in the locking claws 21 in the vertical direction at appropriate intervals in the circumferential direction, and the locking claws 21 are pushed in from the downstream side of the I-shaped pipe portion 5. As a result, the locking claw 21
After being moved over the tapered surface 8a of the locking portion 8 due to its elasticity, it is locked to the upstream side surface 8b of the locking portion 8 by a snap hit.

A seal member fitting surface 22 is formed on the inner peripheral surface of the fitting side portion 20a. The sealing member fitting surface 22
As shown in FIG. 3, the fitting side portion 20a is
Is formed in a concave shape between the locking portion 21 and the enlarged diameter portion 9 of the I-shaped pipe portion 5. A first sealing member 23 made of an O-ring is fitted to the sealing member fitting surface 22 at a downstream end thereof, and a spacer 24 is fitted to the sealing member fitting surface 22 by a concave groove 24a at an upstream side thereof. Further, a second seal member 25 made of an O-ring is fitted further upstream thereof. In addition, this sealing member 23,
25 may be only one.

The pipe hose connection side 20 of the L-shaped pipe 20
An enlarged diameter portion 26 for engagement with a pipe hose is formed on the outer periphery of the distal end portion b. With the above structure, the PCV valve 1
In the case of an I-type pipe specification in which a piping hose is connected in a straight line, as shown in FIG. 4, only the PCV valve 1 is used without using the L-type pipe 20, and the tapered male screw of the PCV valve 1 is used. The pipe hose 27 is connected to the I-shaped pipe portion 5 only when the screw 6 is screwed into the tapered female screw 7 formed on the cylinder head cover 2.

Next, in the case of an L-shaped pipe specification in which a piping hose is connected to the PCV valve 1 substantially orthogonally, FIG.
As shown in FIG. 3 to FIG. 3, a tapered male screw 6 of the PCV valve 1 is screwed to a tapered female screw 7 formed on the cylinder head cover 2.
Then, the fitting side portion 20a of the L-shaped pipe 20 including the seal members 23 and 25 and the spacer 24 is press-fitted from the downstream end thereof. By this press-fitting, the locking claw 21 is locked to the upstream side surface 8b of the locking portion 8 in the I-shaped pipe portion 5 by a snap hit, so that the L-shaped pipe 20 is prevented from coming off with respect to the PCV valve 1 and the circumferential direction. Is rotatably connected to. Further, both the sealing members 23 and 25 are connected to the sealing member fitting surface 11 of the I-shaped pipe portion 5 and the fitting side portion 20 of the L-shaped pipe 20.
The connection portion between the PCV valve 1 and the L-shaped pipe 20 is hermetically sealed by being pressed against the seal member fitting surface 22 of a. Further, since the space between the sealing members 23 and 25 is maintained by the spacer 24 as described above, the sealing performance is improved.

Further, the connection state is such that the L-shaped pipe 20 can rotate around the I-shaped pipe portion, that is, the axis of the PCV valve 1 while maintaining the sealed state, so that the PCV
After rotating and connecting the valve 1 to the cylinder head cover 2 until a predetermined tightening torque is obtained, the L-shaped pipe 20 is rotated to direct its piping hose connection side 20b toward the piping hose 28, A piping hose 28 can be connected. Therefore, it is possible to achieve both the predetermined tightening torque and the L-shaped pipe specification. After connecting the L-shaped pipe 20 to the PCV valve 1 in advance, the PCV valve 1 may be screwed to the cylinder head cover 2,
In this case as well, the same tightening torque and L-shaped pipe specifications can be achieved.

[0025]

As described above, according to the present invention, the change from the I-type pipe specification to the L-type pipe specification is based on the I-type pipe specification.
It can be easily performed by using a PCV valve with a mold pipe as it is.

Further, even when the L-shaped pipe is used, a predetermined tightening torque of the PCV valve can be compatible with the piping direction, and the leakage of blow-by gas can be prevented.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention and is a side view of an L-shaped pipe specification.

FIG. 2 is a plan view of FIG. 1;

FIG. 3 is a longitudinal sectional view of FIG. 1;

FIG. 4 is a longitudinal sectional view in the case of an I-type pipe specification according to the present invention.

FIG. 5 is a longitudinal sectional view showing a conventional PCV valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 PCV valve 5 I-shaped pipe part 6 Tapered male screw 8 Locking part 20 L-shaped pipe 20a Fitting side part 20b Piping hose connection side part 21 Locking claw 23, 25 Seal member

Claims (2)

[Claims] 1. A tapered male thread is formed on the outer periphery of the upstream side of the PCV valve, and an I-shaped pipe portion for connecting a straight piping hose is formed on the downstream side along the axis of the PCV valve.
An L-shaped pipe bent separately from the CV valve is provided.
One bent portion of the molded pipe is a fitting side portion that can be fitted to the I-shaped pipe portion, and the other bent portion is a piping hose connection side portion, and the fitting side of the I-shaped pipe portion and the L-shaped pipe is The PCV valve device is characterized in that the parts are configured so that they can be prevented from coming off and rotatable in the fitted state, and the seal between them can be maintained. 2. A tapered external thread is formed on the outer periphery of the upstream side of the PCV valve, and an I-shaped pipe portion for connecting a straight piping hose along the axis of the PCV valve is formed on the downstream side.
An L-shaped pipe bent separately from the CV valve is provided.
One bent portion of the mold pipe is a fitting side portion that can be fitted to the I-shaped pipe portion, the other bent portion is a piping hose connection side portion, and the outer circumference of the upstream side portion of the I-shaped pipe portion is entirely formed. A locking portion is formed around the circumference, and a locking claw that rotatably locks to the locking portion is formed on the inner circumference of the fitting side portion of the L-shaped pipe. A PCV valve device comprising a seal member on an inner surface of a side portion, the seal member rotatably sealing between the fitting side portion when the fitting side portion is fitted to the I-shaped pipe.