JP2012246908A - Flow control valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flow control valve capable of preventing deterioration in operational stability of a valve element, by reducing sticking of foreign matter to a passage wall surface for sliding a guide part of a valve body.SOLUTION: This PCV (positive crankcase ventilation) valve 40 includes a case 42 provided with a gas passage 55, the valve body 60 arranged in the gas passage 55 so as to be capable of advancing-retreating, and a spring 72 for energizing the valve body 60 in the retreating direction. A measuring (controlling) part 70 is constituted of a measuring hole 55c formed in the gas passage 55, and a measuring surface 61 formed in the valve body 60. A flow rate of fluid is controlled, that is, measured by an advance-retreat of the valve body 60. The valve body 60 is provided with a guide part 62 for slidingly contacting with the passage wall surface 57 on the upstream side of the measuring part 70 in the gas passage 55. The guide part 62 is formed with a foreign matter collecting space part 67 communicating with an upstream side passage part 55b.

Description

  The present invention relates to a flow control valve that controls the flow rate of a fluid.

  For example, a PCV (Positive Crankcase Ventilation) valve is used as a flow control valve for controlling the flow rate of blow-by gas in a blow-by gas reduction device for an internal combustion engine (engine) in a vehicle such as an automobile (see, for example, Patent Document 1).

A conventional example of a PCV valve will be described. FIG. 15 is a cross-sectional view showing a PCV valve.
As shown in FIG. 15, the PCV valve 1 includes a case 2, a valve body 3, and a spring 4. The case 2 is provided with a gas passage 5 extending in the axial direction (left-right direction in FIG. 15). Blow-by gas flows through the gas passage 5. The valve body 3 is provided in the gas passage 5 so as to be able to advance and retract in the axial direction. Further, the spring 4 is interposed between the case 2 and the valve body 3 and urges the valve body 3 in the backward direction (rightward in FIG. 15). A measuring hole 6 a is formed in the middle of the gas passage 5. The valve body 3 has a measuring surface 6b. The measuring part 6 is constituted by the measuring hole 6a (specifically, the hole wall surface) and the measuring surface 6b.

  The PCV valve 1 controls, or measures, the flow rate of the blow-by gas flowing through the gas passage 5 by adjusting the passage cross-sectional area of the metering unit 6 by moving the valve body 3 back and forth. An annular plate-shaped guide flange 8 is formed at the rear end portion of the valve body 3 and projects outward in the radial direction. The outer peripheral surface of the guide flange 8 is slidably contactable with a passage wall surface of the gas passage 5 (specifically, a passage wall surface upstream of the measuring unit 6) 5a. Therefore, when the valve body 3 advances and retracts, the valve body 3 is guided in the axial direction while being supported concentrically with respect to the case 2, thereby improving the operational stability of the valve body 3. Further, a notch 8 a that allows the passage of blow-by gas is formed on the outer peripheral portion of the guide flange 8.

JP-A-2005-240605

  According to the PCV valve 1, foreign matter such as sludge and deposit is likely to adhere to the passage wall surface 5a on which the guide flange 8 of the valve body 3 slides. For this reason, there is a problem that foreign matter accumulates due to a change with time and the operability of the valve body 3 is lowered.

  The problem to be solved by the present invention is to provide a flow control valve capable of reducing adhesion of foreign matter to a passage wall surface on which a guide portion of a valve body slides, and preventing deterioration of operation stability of the valve body. It is in.

The above-mentioned problem can be solved by a flow rate control valve having the gist of the configuration described in the claims.
According to the flow control valve recited in claim 1, a case in which a fluid passage is provided, a valve body provided in the fluid passage so as to be capable of moving forward and backward in an axial direction, and a spring that biases the valve body in a backward direction. A metering portion is formed by a metering hole formed in the middle of the fluid passage and a metering surface formed in the valve body, and flows through the fluid passage by adjusting the cross-sectional area of the metering portion by the advancement and retreat of the valve body A flow rate control valve for controlling the flow rate of fluid, the valve body is provided with a guide portion that guides the valve body in the axial direction by sliding contact with the passage wall surface upstream of the measuring portion in the fluid passage, The guide portion is formed with a foreign matter collecting space portion communicating with the upstream passage portion. According to this configuration, when the valve body is advanced and retracted, the guide body is in sliding contact with the passage wall surface of the fluid passage (specifically, the passage wall surface upstream of the measuring portion), so that the valve body is axially moved (advancing and retracting). Guided by For this reason, the operational stability of the valve body can be improved. Further, when the fluid flows through the foreign matter collecting space of the guide portion of the valve body, the foreign matter contained in the fluid can be collected in the foreign matter collecting space. For this reason, it is possible to reduce the adhesion of foreign matter to the passage wall surface on which the guide portion of the valve body slides, and to prevent the operation stability of the valve body from being lowered.

  According to the flow control valve of the second aspect, the foreign matter collecting space is formed of an annular groove formed in the outer peripheral portion of the guide portion and extending in the circumferential direction.

  According to the flow control valve recited in claim 3, a plurality of annular grooves are formed in the guide portion. According to this structure, the collection | recovery efficiency of a foreign material can be improved according to the labyrinth effect by a some annular groove.

  According to the flow control valve recited in claim 4, the foreign substance collection space is surrounded by a plurality of guide pieces formed at a predetermined interval in the circumferential direction on the outer peripheral portion of the guide portion and extending rearward in the axial direction. It consists of a space part. According to this configuration, the foreign matter collection space portion surrounded by the plurality of guide pieces of the guide portion is opened rearward and radially outward, and fluid can easily flow through the foreign matter collection space portion. In addition, the collection efficiency of foreign matters can be improved.

  According to the flow control valve recited in claim 5, the foreign matter collecting space portion is formed from the hollow portion that is formed in the guide portion and that opens the rear end and opens the front end to the outer peripheral surface of the base end portion of the valve body. Become. According to this configuration, the foreign matter collecting space portion formed by the hollow portion of the guide portion is opened rearward and radially outward, so that fluid can easily flow through the foreign matter collecting space portion, thereby collecting the foreign matter. Efficiency can be improved.

  According to the flow control valve described in claim 6, it is a PCV valve used in a blow-by gas reduction device for an internal combustion engine. According to this configuration, it is possible to reduce the adhesion of foreign matters such as sludge and deposits to the passage wall surface on which the guide portion of the valve body slides in the PCV valve, and to prevent the operation stability of the valve body from being lowered.

It is sectional drawing which shows the PCV valve | bulb concerning Embodiment 1. FIG. It is the II-II sectional view taken on the line of FIG. It is a side view which shows a valve body. It is a block diagram which shows a blow-by gas reduction apparatus. It is a side view which shows the PCV valve concerning Embodiment 2. FIG. It is a side view which shows a valve body. It is sectional drawing which shows the PCV valve | bulb concerning Embodiment 3. FIG. FIG. 8 is a sectional view taken along line VIII-VIII in FIG. 7. It is a side view which shows a valve body. It is sectional drawing which shows the PCV valve | bulb concerning Embodiment 4. It is a XI-XI line sectional view taken on the line of FIG. It is a side view which shows a valve body. It is a side view which shows the valve body concerning Embodiment 5. It is the XIV-XIV arrow directional cross-sectional view of FIG. It is sectional drawing which shows the PCV valve | bulb concerning a prior art example.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

[Embodiment 1]
The first embodiment will be described. In Embodiment 1, the PCV valve used for the blow-by gas reduction apparatus of an internal combustion engine is illustrated as a flow control valve. For convenience of explanation, the PCV valve will be explained after explaining an example of the blow-by gas reducing device. FIG. 4 is a block diagram showing the blow-by gas reduction device.
As shown in FIG. 4, the blow-by gas reduction device 10 introduces blow-by gas that has leaked into the crankcase 15 of the cylinder block 14 from the combustion chamber of the engine body 13 of the engine 12 that is an internal combustion engine into the intake manifold 20. This is a system for burning again in the combustion chamber.

  The engine body 13 includes the cylinder block 14, an oil pan 16 fastened to the lower surface side of the crankcase 15, a cylinder head 17 fastened to the upper surface side of the cylinder block 14, and an upper surface side of the cylinder head 17. The cylinder head cover 18 is fastened. The engine body 13 obtains driving force through a process such as intake, compression, explosion, and exhaust. Further, blow-by gas is generated in the engine main body 13, that is, in the crankcase 15 and in the cylinder head cover 18 communicating with the crankcase 15 as combustion occurs in the combustion chamber (not shown) of the engine main body 13. . Further, the inside of the cylinder head cover 18 and the inside of the crankcase 15 into which blow-by gas flows corresponds to “inside of the engine body” in this specification.

  The cylinder head cover 18 is provided with a fresh air inlet 18a and a blow-by gas outlet 18b. One end (downstream end) of the fresh air introduction passage 30 communicates with the fresh air introduction port 18a. One end (upstream end) of the blowby gas passage 36 is communicated with the blowby gas outlet 18b. The fresh air inlet 18 a and / or the blow-by gas outlet 18 b can be provided in the crankcase 15 instead of the cylinder head cover 18.

  One end (downstream end) of the intake manifold 20 is communicated with the cylinder head 17. The intake manifold 20 includes a surge tank 21. An air cleaner 25 communicates with the other end (upstream end) of the intake manifold 20 via a throttle body 24 and an intake pipe 23. The throttle body 24 includes a throttle valve 24a. The throttle valve 24a is connected to, for example, an accelerator pedal (not shown), and is opened and closed according to the depression amount (operation amount) of the pedal. The air cleaner 25 introduces air so-called fresh air, and has a built-in filter element 26 for filtering the fresh air. The air cleaner 25, the intake pipe 23, the throttle body 24, and the intake manifold 20 form a series of intake passages 27 for introducing fresh air, that is, intake air into the combustion chamber of the engine body 13. In the intake passage 27, a passage portion upstream of the throttle valve 24a is referred to as an upstream intake passage portion 27a, and a passage portion downstream of the throttle valve 24a is referred to as a downstream intake passage portion 27b.

  A fresh air inlet 29 is formed in the intake pipe 23. The fresh air inlet 29 communicates with the other end (upstream end) of the fresh air introduction passage 30. The fresh air introduction passage 30 is provided with a backflow prevention valve 32. The backflow prevention valve 32 allows the flow of so-called fresh air (see arrow Y1 in FIG. 4) from the intake passage portion 27a on the upstream side into the crankcase 15 and flows in the reverse direction, that is, backflow. (See arrow Y3 in FIG. 4). The surge tank 21 has a blow-by gas inlet 34 formed therein. The blow-by gas introduction port 34 communicates with the other end (downstream end) of the blow-by gas passage 36.

  Next, the operation of the blowby gas reduction device 10 will be described. When the engine 12 is light and medium load, the throttle valve 24a is almost fully closed. For this reason, a negative pressure (a negative pressure that increases toward the vacuum side) greater than that of the upstream intake passage portion 27a is generated in the intake passage portion 27b on the downstream side of the intake passage 27. Therefore, the blow-by gas in the engine body 13 is introduced into the intake passage portion 27b on the downstream side through the blow-by gas passage 36 (see arrow Y2 in FIG. 4). At this time, the flow rate of blow-by gas flowing through the blow-by gas passage 36 is controlled by a PCV valve 40 (described later).

  Further, as the blow-by gas is introduced into the intake passage portion 27b on the downstream side from the engine body 13 through the blow-by gas passage 36, the backflow prevention valve 32 is opened. As a result, fresh air in the intake passage portion 27a upstream of the intake passage 27 is introduced into the engine body 13 through the fresh air introduction passage 30 (see arrow Y1 in FIG. 4). Then, the fresh air introduced into the engine body 13 is introduced into the downstream intake passage portion 27b through the blow-by gas passage 36 together with the blow-by gas (see arrow Y2 in FIG. 4). As described above, the inside of the engine body 13 is scavenged.

  Further, when the engine 12 is at a high load, the opening degree of the throttle valve 24a becomes large. Therefore, the pressure in the intake passage portion 27b on the downstream side of the intake passage 27 approaches the atmospheric pressure. Therefore, the blow-by gas in the engine main body 13 becomes difficult to be introduced into the intake passage portion 27b on the downstream side, and the pressure in the engine main body 13 also approaches atmospheric pressure. For this reason, the flow rate of fresh air introduced into the engine body 13 from the upstream intake passage portion 27a through the fresh air introduction passage 30 is also reduced. Further, by closing the backflow prevention valve 32, the backflow of blowby gas from the engine body 13 to the fresh air introduction passage 30 (see arrow Y3 in FIG. 4) is prevented.

  The blow-by gas passage 36 is provided with a PCV valve 40 as a flow rate control valve for controlling the flow rate of blow-by gas. The PCV valve 40 controls or measures the flow rate of the blowby gas in accordance with the differential pressure between the upstream pressure and the downstream pressure of the blowby gas, thereby preventing a sudden change in the flow rate of the blowby gas due to a sudden change in the differential pressure.

Next, the PCV valve 40 will be described. 1 is a cross-sectional view showing a PCV valve, FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1, and FIG. 3 is a side view showing the valve body. For convenience of explanation, the left side of FIG. 1 is the front side, and the right side is the rear side.
As shown in FIG. 1, the case 42 of the PCV valve 40 is made of, for example, resin and has a hollow cylindrical shape. The hollow portion of the case 42 is a gas passage 55 extending in the axial direction (left and right direction in FIG. 1). An annular rear end wall 43 projecting inward in the radial direction is formed at the rear end portion (right end portion in FIG. 1) of the case 42. The hollow hole portion of the rear end wall 43 is an inlet 55 a of the gas passage 55. Further, the front end opening of the case 42 serves as an outlet 55 e of the gas passage 55.

  An annular projecting wall 44 projecting inward in the radial direction is formed at the central portion of the case 42 in the axial direction. The overhanging wall 44 divides the gas passage 55 into an inlet 55a side, that is, an upstream passage portion 55b, and an outlet 55e side, that is, a downstream passage portion 55d. The hollow hole of the overhanging wall 44 is a measuring hole 55c that allows the upstream-side passage portion 55b and the downstream-side passage portion 55d to communicate with each other. The rear end portion of the case 42 is connected to a passage portion on the upstream side of the blow-by gas passage 36 (see FIG. 4). Further, the front end portion of the case 42 is connected to a passage portion on the downstream side of the blow-by gas passage 36. The rear end of the case 42 may be connected to the blow-by gas outlet 18b (see FIG. 4) of the cylinder head cover 18. A blow-by gas that is a fluid flows in the gas passage 55. The gas passage 55 corresponds to a “fluid passage” in this specification.

  A valve body 60 is disposed in the gas passage 55 so as to be able to advance and retreat in the axial direction (left-right direction in FIG. 1). The valve body 60 is made of, for example, resin and is formed in a substantially cylindrical shape. A metering surface 61 having a tapered shape is formed on the outer peripheral surface of the valve body 60. The valve body 60 is inserted into the measuring hole 55 c from the upstream passage portion 55 b in the gas passage 55. The inner peripheral surface of the overhanging wall 44 is a hole wall surface (reference numeral omitted) of the measuring hole 55c. A measuring portion 70 is configured by the measuring hole 55 c (specifically, the hole wall surface) and the measuring surface 61 of the valve body 60. Therefore, as the valve body 60 moves backward (moves to the right in FIG. 1), the effective opening area of the measuring portion 70, that is, the passage cross-sectional area is increased. Conversely, as the valve body 60 moves forward (moves to the left in FIG. 1), the passage cross-sectional area of the measuring portion 70 is reduced. In addition, a cushion spring 46 made of a coil spring is provided in the downstream passage portion 55d of the gas passage 55. The valve body 60 is elastically received by the cushion spring 46 at the time of advance to the most advanced position. The valve body 60 corresponds to the “valve body” in this specification. In addition, a passage wall surface on the upstream side of the gas passage 55 in the case 42, that is, a passage wall surface of the passage portion 55b on the upstream side is referred to as a “guide wall surface 57”.

  A guide portion 62 is provided at the rear end portion of the valve body 60. The guide portion 62 guides the valve body 60 in the axial direction by slidingly contacting the guide wall surface 57 of the gas passage 55. The guide part 62 is coaxially protruded rearward from the rear end of the valve body 60 and an annular plate-shaped guide flange 63 (referred to as a front guide flange) that projects radially outward from the rear end part of the valve body 60. And an annular plate-like guide flange (referred to as a rear guide flange) 65 projecting radially outward from the rear end portion of the shaft portion 64 (see FIG. 3). Both front and rear guide flanges 63 and 65 are formed in the same shape. The outer peripheral surfaces of both guide flanges 63 and 65 are slidably contactable with the guide wall surface 57 (see FIG. 2). Therefore, when the valve body 60 advances and retreats, the valve body 60 is guided in the axial direction while being concentrically supported with respect to the case 42. Thereby, the vibration in the radial direction of the valve body 60 is suppressed. In addition, an appropriate number of notches 66 (three are shown in FIG. 2) that allow the passage of blow-by gas are formed on the outer peripheral portions of both guide flanges 63 and 65.

  As shown in FIG. 1, an annular groove 67 (see FIG. 3) extending in the circumferential direction formed between the outer peripheral portion of the guide portion 62, that is, between the guide flanges 63 and 65, is a passage on the upstream side of the gas passage 55. Opened in the portion 55b. The annular groove 67 is a foreign matter collection space portion (same as the annular groove) 67 that communicates with the passage portion 55 b on the upstream side of the gas passage 55.

  A spring 72 made of a compression coil spring is interposed between the case 42 and the valve body 60. The spring 72 is fitted to the valve body 60. The rear end portion of the spring 72 is locked to the guide flange 63 on the front side of the valve body 60. Further, the front end portion of the spring 72 is locked to the overhanging wall 44. The spring 72 always urges the valve body 60 in the backward direction (rightward in FIG. 1), that is, in the direction in which the passage sectional area of the measuring unit 70 increases. The rear guide flange 65 abuts against the rear end wall 43 of the case 42 at the last retracted position of the valve body 60.

  Next, the operation of the PCV valve 40 will be described. When the passage portion 55d on the downstream side of the passage portion 55b on the upstream side of the gas passage 55 in the case 42 becomes a low pressure (negative pressure), blow-by gas flows into the passage portion 55b on the upstream side from the inlet 55a, It flows out from the outlet 55e through the measuring hole 55c and the passage portion 55d on the downstream side. At this time, the valve body 60 moves forward and backward (in the axial direction) according to the differential pressure between the upstream pressure of the upstream passage portion 55b and the downstream pressure of the downstream passage portion 55d (including the biasing force of the spring 72). Moving. Thereby, the flow rate of the blow-by gas flowing through the gas passage 55 is controlled, that is, measured. Specifically, when the upstream pressure is larger than the downstream pressure and the differential pressure between the upstream pressure and the downstream pressure is large, the valve body 60 is advanced against the urging force of the spring 72, thereby Since the passage cross-sectional area is reduced, the flow rate of blow-by gas is reduced. Further, when the differential pressure between the upstream pressure and the downstream pressure is reduced, the valve body 60 is retracted by the urging force of the spring 72, whereby the passage cross-sectional area of the measuring unit 70 is increased. Will increase. In this way, the flow rate of the blow-by gas flowing through the gas passage 55 is controlled by increasing or decreasing the passage cross-sectional area of the measuring unit 70.

  According to the PCV valve 40 described above, when the valve body 60 is advanced and retracted, the guide flanges 63 and 65 of the guide portion 62 are in sliding contact with the guide wall surface 57 of the case 42, so that the valve body 60 is axially moved (advanced and retracted). Direction). For this reason, the operational stability of the valve body 60 can be improved. Further, the blow-by gas circulates in the foreign matter collection space 67 of the guide portion 62 of the valve body 60, whereby foreign matters (foreign matter such as sludge and deposit) contained in the blow-by gas are collected in the foreign matter collection space 67. be able to. Specifically, it is possible to collect the foreign matter by adhering it to the wall surface of the foreign matter collecting space 67 (the rear end surface of the front guide flange 63, the outer peripheral surface of the shaft portion 64, and the front end surface of the rear guide flange 65). it can. For this reason, the adhesion of foreign matter to the guide wall surface 57 on which the guide portion 62 of the valve body 60 slides can be reduced, and the operation stability of the valve body 60 can be prevented from being lowered.

[Embodiment 2]
Embodiment 2 will be described. Since this embodiment and subsequent embodiments are obtained by changing a part of the first embodiment, the changed portion will be described and redundant description will be omitted. FIG. 5 is a side view showing the PCV valve, and FIG. 6 is a side view showing the valve body.
As shown in FIG. 6, in this embodiment, two intermediate guide flanges 68 are added between the guide flanges 63 and 65 of the guide portion 62 of the valve body 60 in the first embodiment. The intermediate guide flange 68 is formed in the same shape as both guide flanges 63 and 65. A total of four guide flanges 63, 65, and 68 are arranged at equal intervals. A plurality of (three in the present embodiment) annular grooves (indicated by reference numeral 69) extending in the circumferential direction formed between adjacent guide flanges are a foreign matter collecting space communicating with the upstream passage portion 55b. 69 (refer to FIG. 5). According to the present embodiment, the collection efficiency of foreign matters (foreign matter such as sludge and deposit) can be improved by the labyrinth effect by the three annular grooves (foreign matter collecting space) 69.

[Embodiment 3]
A third embodiment will be described. 7 is a cross-sectional view showing the PCV valve, FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. 7, and FIG. 9 is a side view showing the valve body.
As shown in FIG. 9, in this embodiment, the guide portion 62 (see FIG. 3) of the valve body 60 in the first embodiment is changed to a guide portion (reference numeral 74). That is, in the guide part 74, the shaft part 64 and the rear guide flange 65 in the guide part 62 (see FIG. 1) are omitted.

  A plurality of rod-like (three in this embodiment) guide pieces 75 are formed on the outer peripheral portion (the portion excluding the notch 66) of the rear side surface of the front guide flange 63 (see FIG. 8). . Each guide piece 75 extends axially rearward and is formed at a predetermined interval in the circumferential direction. The outer peripheral surface of each guide piece 75 is slidably contactable with the guide wall surface 57 of the cable 42 together with the outer peripheral surface of the front guide flange 63 (see FIGS. 7 and 8). A space portion 76 surrounded by the three guide pieces 75 is a foreign matter collection space portion (same reference numeral as that of the space portion) 76.

  According to the present embodiment, the foreign substance collection space 67 surrounded by the three guide pieces 75 of the guide 62 is opened rearward and radially outward. Therefore, the blow-by gas easily flows through the foreign matter collection space 67. As a result, the collection efficiency of foreign matters (foreign matter such as sludge and deposit) can be improved.

[Embodiment 4]
A fourth embodiment will be described. 10 is a cross-sectional view showing the PCV valve, FIG. 11 is a cross-sectional view taken along line XI-XI in FIG. 10, and FIG. 12 is a side view showing the valve body.
As shown in FIG. 12, in this embodiment, the guide portion 62 (see FIG. 3) of the valve body 60 in the first embodiment is changed to a guide portion (reference numeral 78). That is, in the guide part 78, the guide flanges 63 and 65 in the guide part 62 are long guide flanges (symbol 79) attached in the axial direction. Accordingly, the annular groove 67 (see FIG. 3) in the guide portion 62 is omitted. Moreover, the hollow part 80 is formed in the guide part 78 (refer FIG.10 and FIG.11).

  As shown in FIG. 10, the hollow portion 80 has a straight hole portion 81 formed concentrically with the guide flange 79, and penetrates from the middle of the straight hole portion 81 radially outward and obliquely forward. And a plurality of (four are shown in FIG. 11) branch hole portions 82. The front end portion (outer end portion) of the branch hole portion 82 is opened on the outer peripheral surface of the base end portion of the valve body 60 (see FIG. 12). A hollow portion 80 having a straight hole portion 81 and a branch hole portion 82 serves as a foreign matter collecting space portion (same reference numeral as that of the space portion) 80.

  According to the present embodiment, the foreign substance collection space 80 of the guide 62 is directed rearward and radially outward. Therefore, the blow-by gas easily flows through the foreign matter collection space 67. As a result, the collection efficiency of foreign matters (foreign matter such as sludge and deposit) can be improved.

[Embodiment 5]
Embodiment 5 will be described. 13 is a side view showing the valve body, and FIG. 14 is a cross-sectional view taken along line XIV-XIV in FIG.
As shown in FIG. 13, in the present embodiment, the outer peripheral surface of the guide flange 79 of the guide portion 62 in the fourth embodiment is a cylindrical outer peripheral surface 79a in which the notch 66 (see FIG. 10) is omitted. It is.
According to the present embodiment, the foreign matter collecting space 67 can be used as a flow path for blow-by gas flowing through the gas passage 55. Further, the shape of the guide flange 79 can be simplified.

  The present invention is not limited to the above-described embodiment, and modifications can be made without departing from the gist of the present invention. For example, the present invention can be applied not only to the PCV valve 40 but also to a flow control valve that controls the flow rate of fluid other than blow-by gas. Moreover, the guide part may be formed integrally with the valve body 60, or a separate part may be attached. Moreover, the shape of a guide part can be changed suitably.

10 ... Blow-by gas reduction device 12 ... Engine (internal combustion engine)
40 ... PCV valve (flow control valve)
42 ... Case 55 ... Gas passage (fluid passage)
55b ... upstream passage portion 55c ... metering hole 55d ... downstream passage portion 57 ... guide wall surface (upstream passage wall surface)
60 ... Valve body (valve body)
61 ... Measurement surface 62 ... Guide portion 67 ... Space for collecting foreign matter (annular groove)
69 ... Space for collecting foreign matter (annular groove)
70 ... Measuring part 72 ... Spring 75 ... Guide piece 76 ... Space part for collecting foreign matter (space part)
80 ... Space for collecting foreign matter (hollow part)

Claims (6)

A case with a fluid passage;
A valve body provided in the fluid passage so as to be capable of moving back and forth in the axial direction;
A spring for urging the valve body in the backward direction,
A measuring part is constituted by a measuring hole formed in the middle of the fluid passage and a measuring surface formed in the valve body,
A flow rate control valve for controlling a flow rate of a fluid flowing through a fluid passage by adjusting a passage cross-sectional area of the measuring portion by advancing and retracting the valve body;
The valve body is provided with a guide portion that guides the valve body in the axial direction by sliding contact with a passage wall surface upstream of the measuring portion in the fluid passage,
The flow rate control valve, wherein the guide portion is formed with a foreign matter collection space portion communicating with the upstream-side passage portion. The flow control valve according to claim 1,
The flow rate control valve according to claim 1, wherein the foreign matter collecting space is formed by an annular groove formed in an outer peripheral portion of the guide portion and extending in a circumferential direction. The flow control valve according to claim 2,
A flow control valve, wherein a plurality of the annular grooves are formed in the guide portion. The flow control valve according to claim 1,
The space for collecting foreign matter is formed by a space surrounded by a plurality of guide pieces formed at a predetermined interval in the circumferential direction on the outer periphery of the guide and extending rearward in the axial direction. A flow control valve characterized by The flow control valve according to claim 1,
The foreign matter collecting space is a flow rate control valve formed of a hollow portion formed in the guide portion and having a rear end opened and a front end opened on an outer peripheral surface of a base end portion of the valve body. A flow control valve according to any one of claims 1 to 5,
A flow control valve, which is a PCV valve used in a blow-by gas reduction device for an internal combustion engine.

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