WO2017216957A1

WO2017216957A1 - Air bypass valve

Info

Publication number: WO2017216957A1
Application number: PCT/JP2016/068110
Authority: WO
Inventors: 拓也不二原
Original assignee: 三菱電機株式会社
Priority date: 2016-06-17
Filing date: 2016-06-17
Publication date: 2017-12-21

Abstract

An O ring (22) seals a gap between a stator ASSY (11) and a pipe (108) to which an air bypass valve (1) is attached, and engagement between the stator ASSY (11) and a snap-fitting part (14a) of a holder (14) is reinforced by reaction force compressed by the attaching to the pipe (108).

Description

Air bypass valve

This invention relates to an air bypass valve used for a turbocharger.

In an engine with a turbocharger, an air bypass valve is installed in the air bypass passage that connects the upstream side and the downstream side of the compressor, and the air bypass passage is opened by the air bypass valve so that the supercharged air on the downstream side of the compressor is upstream. It is returning.

For example, Patent Document 1 describes an electrically controlled air bypass valve that opens and closes by electromagnetic force. In this air bypass valve, a piston is fitted into a piston casing connected to a solenoid portion that generates electromagnetic force, and this piston functions as a valve body.

Also, a communication hole is formed in the piston, and a seal member is mounted on the inner peripheral side of the piston casing. The communication hole communicates the piston chamber that is the internal space of the valve and the external space of the valve that is connected to the downstream side of the compressor. The seal member seals between the piston chamber and the piston casing by contacting the outer peripheral surface of the piston.

Thus, the seal member seals between the piston chamber and the piston casing, and the communication hole connects the piston chamber of the valve and the downstream side of the compressor. As a result, the pressure in the piston chamber and the pressure on the downstream side of the compressor become equal, and the pressure acting on the piston is balanced.

The load that moves the valve body is lower than when there is a pressure difference due to the balance between the pressure in the internal space and the external space of the valve. Accordingly, the valve element can be driven even when a solenoid portion having a small driving force is used.

JP 2016-6347 A

In order to keep the pressure in the internal space of the valve equal to the pressure in the external space, it is necessary to prevent air leakage from between the internal space of the valve body and the case housing the valve body by the seal member.
The seal member is realized as a seal ring that comes into contact with the outer periphery of the valve body, and the structure for holding the seal ring is provided, for example, in a case made of sheet metal that constitutes the solenoid unit.

However, when the solenoid part is molded with resin, the seal ring cannot be molded with the solenoid part. For this reason, it is necessary to provide a holder for holding the seal ring separately from the case.

In this case, as a structure for assembling the holder to the solenoid part, a general snap-fit structure is adopted as a simple assembling structure of the resin member.
However, since the snap-fit structure is assembled by hooking engagement, it may come off when an external force such as vibration is applied. For this reason, there is a concern that the holder may fall off when the actual vehicle is used.

In the air bypass valve described in Patent Document 1, the piston casing that holds the seal ring is provided separately from the valve casing in which the solenoid portion is resin-molded.
If the cases themselves are separately provided in this way, a new structure for assembling the cases is required, and the entire valve is increased in size as compared with a configuration in which the cases are integrated.

This invention solves the said subject, and it aims at obtaining the air bypass valve which can strengthen the assembly | attachment of the holder holding a seal ring with a simple structure.

The air bypass valve according to the present invention includes a solenoid part, a valve body, a communication hole, a seal ring, a holder, and an O-ring. The solenoid part is molded with resin and generates electromagnetic force when energized. The valve body is driven by electromagnetic force and reciprocates in the direction of entering and exiting from the solenoid portion. The communication hole is provided in the valve body and communicates the inside and the outside via the valve body. The seal ring seals a gap between the housing and the outer periphery of the valve body. The holder has a snap fit portion that is engaged with and connected to the solenoid portion, and is attached to the solenoid portion by the snap fit portion to hold the seal ring on the outer peripheral side of the valve body. The O-ring seals between the counterpart member to which the air bypass valve is attached and the solenoid portion, and assists the engagement of the snap-fit portion with the reaction force compressed by the attachment to the counterpart member.

According to this invention, the O-ring seals between the counterpart member to which the air bypass valve is attached and the solenoid portion, and the snap fit portion of the holder is engaged by the reaction force compressed by the attachment to the counterpart member. To assist. Thereby, the assembly of the holder holding the seal ring can be strengthened with a simple structure using the snap-fit portion and the O-ring.

It is sectional drawing which shows the structural example of the air bypass valve which concerns on Embodiment 1 of this invention. It is a figure which shows the structure of the engine with a turbocharger to which the air bypass valve which concerns on Embodiment 1 is applied, and has shown the state of accelerator ON. It is a figure which shows the structure of the engine with a turbocharger to which the air bypass valve which concerns on Embodiment 1 is applied, and has shown the state of accelerator OFF. FIG. 4A is a cross-sectional view showing an operating state of the air bypass valve according to Embodiment 1, and shows a closed state. FIG. 4B is a cross-sectional view showing an operating state of the air bypass valve according to Embodiment 1, and shows a valve open state. FIG. 5A is a perspective view showing the holder in the first embodiment, and FIG. 5B is a side view of the holder in the first embodiment. FIG. 6A is a cross-sectional view illustrating a state before the air bypass valve according to Embodiment 1 is attached to the counterpart member. FIG. 6B is a cross-sectional view illustrating a state after the air bypass valve according to Embodiment 1 is attached to the counterpart member. FIG. 3 is a cross-sectional view showing a configuration example of an O-ring and its peripheral part in the first embodiment. FIG. 6 is a cross-sectional view showing another configuration example of the O-ring and its peripheral part in the first embodiment. FIG. 9A is a cross-sectional view showing a state before the air bypass valve according to Embodiment 2 of the present invention is attached to the counterpart member. FIG. 9B is a cross-sectional view showing a state after the air bypass valve according to Embodiment 2 is attached to the counterpart member. FIG. 6 is a cross-sectional view showing a configuration example of an O-ring and its peripheral part in a second embodiment.

Hereinafter, in order to describe the present invention in more detail, modes for carrying out the present invention will be described with reference to the accompanying drawings.
Embodiment 1 FIG.
FIG. 1 is a cross-sectional view showing a configuration example of an air bypass valve 1 according to Embodiment 1 of the present invention. In the air bypass valve 1, the core assembly 2 is inserted into the coil assembly 3. Here, the core assembly 2 is a member in which the core 4 is connected to the yoke 5 by welding. The coil ASSY 3 is a member in which a coil 7 formed by winding a coil wire around a bobbin 6 is connected to a terminal 8 by fusing.

A stator ASSY 11 is obtained by mounting the plate 9 on the structure in which the core ASSY 2 is inserted into the coil ASSY 3 and insert-molding the core ASSY 2, the coil ASSY 3, the plate 9 and the bush 10 with resin. A connector 8a connected to the vehicle-side connector is formed on the stator ASSY11.
The stator ASSY 11 is a specific embodiment of the solenoid portion in the present invention.

The pipe 12 is inserted into the plate 9 of the stator ASSY 11. The holder 14 to which the seal ring 13 is attached is assembled to the stator assembly 11.
When the spring 15 is further installed on the pipe 12, the valve ASSY 16 is inserted into the stator ASSY 11. The valve ASSY 16 is a member in which a spring 18, a valve body 19, and a washer 20 are inserted into the plunger 17 in this order, and the tip end of one end of the plunger 17 is caulked.

In addition, the valve body 19 reciprocates in the direction to enter / exit from the stator ASSY 11. The valve body 19 is formed with a communication hole 21 that communicates the inside and the outside of the valve body 19.

The O-ring 22 is attached to the outer peripheral side of the holder 14.
The air bypass valve 1 is attached to the vehicle-side member with a screw passed through the screw hole of the bush 10. At this time, the O-ring 22 ensures airtightness between the air bypass valve 1 and the vehicle side member. Further, the connector on the vehicle side and the connector 8a of the air bypass valve 1 are connected.

Next, a usage example of the air bypass valve 1 according to Embodiment 1 will be described with reference to FIGS. In an engine with a turbocharger, the air bypass valve 1 is attached to an air bypass passage 107 that connects the upstream side and the downstream side of the compressor 100a of the turbocharger 100.

In the accelerator ON state shown in FIG. 2, the throttle valve 103 of the intake passage 102 is open, and the air compressed by the compressor 100 a of the turbocharger 100 (hereinafter referred to as supercharged air) flows through the intercooler 104 and flows into the engine 101. Carried to. At this time, the air bypass valve 1 is closed.
A turbine 100b is mounted on the same axis as the compressor 100a. As the exhaust gas of the engine 101 flows through the exhaust passage 105 and rotates the turbine 100b, the compressor 100a also rotates. The exhaust passage 105 is provided with a waste gate valve 106 for adjusting the pressure of the exhaust gas.

In the accelerator OFF state shown in FIG. 3, the throttle valve 103 is closed and the supercharged air is accumulated in the intake passage 102. If the supercharged air is accumulated, the turbocharger 100, the engine 101, the piping of the intake passage 102, and the like may be damaged.
Therefore, the air bypass valve 1 is opened to communicate with the air bypass passage 107, and the supercharged air is released from the downstream side to the upstream side of the compressor 100a.

Next, the operation state of the air bypass valve 1 will be described with reference to FIGS. 4A and 4B.
The pipe 108 of the air bypass passage 107 embodies the counterpart member in the present invention, and the air bypass valve 1 is attached to the pipe 108 with a screw 23.
A vehicle-side power supply 109 is connected to the connector 8 a of the air bypass valve 1. In the air bypass passage 107, a part of the pipe 108 is a valve seat 107a.
4A shows a fully closed state of the air bypass valve 1, and FIG. 4B shows a fully opened state of the air bypass valve 1.

When the power source 109 is in the OFF state, as shown in FIG. 4A, the valve ASSY 16 is urged by the spring 15 and the valve body 19 is pressed against the valve seat 107a.
Thereby, the air bypass passage 107 is closed.
Incidentally, the spring 18 is a member that holds the valve body 19 in a state of being pressed against the washer 20 in order to prevent rattling between the plunger 17 and the valve body 19.

When the power source 109 is turned on, the coil 7 is energized through the terminal 8 as shown in FIG. 4B. Thereby, an electromagnetic force is generated in the coil ASSY 3 and the plunger 17 is attracted to the core 4 side. When the plunger 17 moves to the core 4 side while being guided by the pipe 12, the valve ASSY16 attached to the plunger 17 is operated, the valve body 19 is separated from the valve seat 107a, and the supercharged air is removed from the upstream side of the compressor 100a. To escape.
Thus, the air bypass passage 107 is opened and closed by the valve body 19 reciprocatingly moving in the direction in and out of the stator ASSY 11.

Further, when the valve body 19 is at both ends of the reciprocating movement range, that is, when the air bypass valve 1 is in a fully closed state and a fully open state, the supercharged air enters the internal space A through the communication hole 21 and is sealed. Press ring 13. In this way, the seal ring 13 is in contact with the inner peripheral surface of the stator ASSY 11 and the outer peripheral surface of the valve body 19 without any gap, thereby preventing air leakage from the gap between the stator ASSY 11 and the valve body 19.

Next, details of the holder 14 in the air bypass valve 1 will be described.
FIG. 5A is a perspective view showing the holder 14 in Embodiment 1, and FIG. 5B is a side view of the holder 14. As shown in FIG. 5A, the holder 14 is a ring-shaped member made of resin, and includes a snap fit portion 14a, a seal seat surface portion 14b, and an inner wall portion 14c.

The snap fit portion 14 a is a key-like member extending in the axial direction from one end portion of the holder 14, and is provided at four locations on the outer peripheral portion of the holder 14 in FIG. 5A.
The seal seat surface portion 14b is a portion projecting inward from the opening edge portion on the end portion side where the snap fit portion 14a of the holder 14 is provided, and the inner wall portion 14c is provided on the outer peripheral side of the seal seat surface portion 14b. It is a wall.

Further, as shown in FIGS. 5A and 5B, the holder 14 is opened at a plurality of locations on the outer peripheral surface. Thereby, even if the holder 14 attached to the stator ASSY 11 rotates about the shaft center, it is possible to prevent the outer peripheral surface of the holder 14 from blocking the flow of air.

Next, details of the air bypass valve 1 will be described.
FIG. 6A is a cross-sectional view showing a state before the air bypass valve 1 is attached to the pipe 108 which is the counterpart member. FIG. 6B is a cross-sectional view showing a state after the air bypass valve 1 is attached to the pipe 108. FIG. 7 is a cross-sectional view showing a configuration example of the O-ring 22 and its peripheral part.

The seal ring 13 is a ring-shaped member made of resin, and has a substantially V-shaped cross section as shown in FIG. 6A. The outer diameter of the seal ring 13 is formed to be slightly larger than the seal seat surface portion 14 b of the holder 14. As a result, the seal ring 13 is mounted so as to be pushed toward the seal seat surface portion 14 b of the holder 14. At this time, the seal ring 13 is in contact with the seal seat surface portion 14b and the inner wall portion 14c.

As shown in FIG. 6A, the holder 14 to which the seal ring 13 is attached is attached to the stator ASSY 11 with a snap-fit structure.
For example, a groove 11-1 is formed on the outer peripheral surface of the output side of the stator ASSY 11, and the snap fit portion 14a is hooked and engaged with the groove 11-1. Thereafter, the valve assembly 16 is assembled to the stator assembly 11.
In this way, the seal ring 13 is held on the outer peripheral side of the valve body 19 by the holder 14 and is in contact with the inner peripheral surface of the stator assembly 11 and the outer peripheral surface of the valve body 19.

Further, before the air bypass valve 1 is attached to the pipe 108, the O-ring 22 is attached to the outer peripheral side of the snap fit portion 14a as shown in FIG. 6A.
That is, the O-ring 22 urges the snap fit portion 14a from the outer peripheral side to restrict the snap fit portion 14a from moving in a direction in which the engagement with the groove portion 11-1 is released. By comprising in this way, it can reduce that the holder 14 falls from stator ASSY11 in the case of transportation by the air bypass valve 1 single-piece | unit.

The air bypass valve 1 is attached to the pipe 108 of the air bypass passage 107 with a screw 23. At this time, the O-ring 22 is pressed against the inclined surface 110 formed on the pipe 108, and is compressed from the stator ASSY 11, the snap fit portion 14a, and the inclined surface 110 of the pipe 108 as shown in FIG. 6B.
The inclined surface 110 is an inclined surface provided on the inner peripheral side of the opening edge of the pipe 108 to which the air bypass valve 1 is attached, and is inclined 45 ° with respect to the axial direction.

Since the O-ring 22 is an elastic member, the reaction force due to the compression of the O-ring 22 occurs in three directions, that is, the stator assembly 11, the snap fit portion 14 a, and the inclined surface 110 of the pipe 108, as indicated by arrows in FIG. Join. That is, the O-ring 22 is in close contact with the stator assembly 11 and the inclined surface 110 of the pipe 108, and the snap-fit portion 14a is urged in a direction to engage with the groove portion 11-1 by the reaction force of the O-ring 22.
Thus, the engagement of the snap fit portion 14a is assisted by the reaction force caused by the compression of the O-ring 22, so that the attachment of the holder 14 to the stator ASSY 11 is strengthened.
Therefore, even if it is a case where it is used with the actual vehicle which a vibration etc. add, the drop-off of the holder 14 can be prevented.

Particularly, the O-ring 22 is compressed in an oblique direction from the inclined surface 110 inclined by 45 ° with respect to the axial direction. In this state, the reaction force due to the compression of the O-ring 22 is equally applied to both the output side surface of the stator ASSY 11 and the snap fit portion 14a. As a result, the O-ring 22 appropriately assists the engagement of the snap-fit portion 14a, and the O-ring 22 is in close contact with the output-side surface of the stator ASSY 11 so that airtightness between the stator ASSY 11 and the pipe 108 is appropriately ensured. .

Moreover, the step part 111 shown in FIG. 8 may be sufficient as the attachment location of O-ring 22 in the piping 108. FIG. The step portion 111 is provided on the inner peripheral side of the opening edge of the pipe 108.
The air in the air bypass passage 107 flows into the stepped portion 111 through the gap between the snap fit portion 14a and the inner peripheral surface of the opening edge of the pipe 108, as indicated by the thin arrow in FIG. The pressure which always pushes up from below is given. At this time, the O-ring 22 is compressed from the output side surface of the stator ASSY 11, the snap fit portion 14 a and the inner peripheral surface of the step portion 111.

Therefore, the reaction force due to the compression of the O-ring 22 is applied in three directions, that is, the output side surface of the stator ASSY 11, the snap fit portion 14 a, and the inner peripheral surface of the step portion 111, as shown by the thick arrows in FIG. That is, the O-ring 22 is in close contact with the output side surface of the stator assembly 11 and the inner peripheral surface of the stepped portion 111, and the snap fit portion 14a is engaged with the groove portion 11-1 by the reaction force of the O-ring 22. Be energized.

As described above, in the air bypass valve 1 according to the first embodiment, the O-ring 22 seals between the pipe 108 that is the counterpart member to which the air bypass valve 1 is attached and the stator ASSY 11. Further, the engagement of the snap fit portion 14a is assisted by the reaction force of the O-ring 22 compressed by the attachment to the pipe 108. In particular, the O-ring 22 assists the engagement by urging the snap-fit portion 14a in the radial direction.
As described above, the assembly of the holder 14 holding the seal ring 13 can be strengthened with a simple structure using the snap fit portion 14 a and the O-ring 22.
In addition, since the holder 14 does not need to be joined by welding, caulking, or the like, the manufacturing cost can be reduced, and the airtightness between the stator ASSY 11 and the pipe 108 is appropriately ensured.

In the air bypass valve 1 according to the first embodiment, the O-ring 22 is compressed in an oblique direction by the inclined surface 110 of the pipe 108 on the vehicle side.
With this configuration, the reaction force due to the compression of the O-ring 22 is evenly applied to the stator assembly 11 and the snap fit portion 14a, and the engagement of the snap fit portion 14a and the airtightness of the stator assembly 11 are ensured. Both can be done appropriately.

Embodiment 2. FIG.
FIG. 9A is a cross-sectional view showing a state before the air bypass valve 1A according to Embodiment 2 of the present invention is attached to a pipe 108A that is a counterpart member. FIG. 9B is a cross-sectional view showing a state after the air bypass valve 1A is attached to the pipe 108A. FIG. 10 is a cross-sectional view showing a configuration example of the O-ring 22 and its peripheral part in the second embodiment.

A groove portion 11A-1 is formed on the outer peripheral surface of the output side of the stator ASSY 11A, and the snap fit portion 14a is hooked and engaged with the groove portion 11A-1. However, the groove 11A-1 is a groove wider in the axial direction than the groove 11-1 shown in the first embodiment.
The width of the groove portion 11A-1 is a width that allows the O-ring 22 to be fitted between the snap fit portion 14a without a gap in a state where the snap fit portion 14a is engaged with the groove portion 11A-1.
The depth of the groove 11A-1 is formed such that the O-ring 22 protrudes radially outward from the snap fit portion 14a hooked on the lower side in the axial direction.

In a state before the air bypass valve 1A is attached to the pipe 108A, as shown in FIG. 9A, the O-ring 22 is attached to the upper portion in the axial direction of the snap fit portion 14a.
That is, the O-ring 22 restricts the snap fit portion 14a from moving in a direction in which the engagement with the groove portion 11A-1 is released by pressing the snap fit portion 14a from the axial direction. Even if comprised in this way, it can reduce that the holder 14 falls from stator ASSY11A in the case of the transportation by air bypass valve 1A single-piece | unit.

The holder 14 is attached to the stator ASSY 11A in which the O-ring 22 is mounted in the groove 11A-1. That is, the snap fit portion 14a is engaged with the groove portion 11A-1 in which the O-ring 22 is mounted.

The air bypass valve 1A is attached to the pipe 108A of the air bypass passage 107 with a screw 23. Note that a portion for receiving the O-ring 22 in the axial direction is not formed at the opening edge of the pipe 108A. When the air bypass valve 1A is attached to the opening of the pipe 108A, the O-ring 22 includes the bottom surface of the groove part 11A-1, the side surface of the upper part in the axial direction of the groove part 11A-1, the upper part of the snap fit part 14a, and the opening part of the pipe 108A. It is compressed from the inner peripheral surface.

As shown by arrows in FIG. 10, the compression reaction force of the O-ring 22 is applied to the bottom surface of the groove portion 11A-1, the axially upper side surface of the groove portion 11A-1, the upper portion of the snap fit portion 14a, and the opening portion of the pipe 108A. It is applied in four directions on the inner peripheral surface. That is, the O-ring 22 is in close contact with the bottom surface of the groove portion 11A-1, the axially upper side surface of the groove portion 11A-1, and the inner peripheral surface of the opening portion of the pipe 108A, and the snap fit portion 14a is the reaction force of the O-ring 22 Is biased in a direction to engage with the groove 11A-1.

As described above, in the air bypass valve 1A according to the second embodiment, the snap fit portion 14a is urged in the axial direction by the reaction force compressed by the O-ring 22, and the stator assembly 11A and the snap fit portion 14a of the holder 14 are To assist the engagement.
Even if comprised in this way, the assembly | attachment of the holder 14 can be strengthened with the simple structure using the snap fitting part 14a and the O-ring 22. FIG. Therefore, even if it is a case where it is used with the actual vehicle which a vibration etc. add, the drop-off of the holder 14 can be prevented.
In addition, since the holder 14 does not need to be joined by welding, caulking, or the like, the manufacturing cost can be reduced, and the airtightness between the stator ASSY 11A and the pipe 108A is appropriately ensured.

In the present invention, within the scope of the invention, a free combination of each embodiment, a modification of an arbitrary component of each embodiment, or an omission of any component in each embodiment is possible.

The air bypass valve according to the present invention can strengthen the assembly of the holder member that holds the seal ring, and is suitable as an air bypass valve for a turbocharged engine of a vehicle.

1, 1A air bypass valve, 2 core assembly, 3 coil assembly, 4 core, 5 yoke, 6 bobbin, 7 coil, 8 terminal, 8a connector, 9 plate, 10 bush, 11 stator assembly 11, 11-1, 11A-1 Groove part, 12 pipe, 13 seal ring, 14 holder, 14a snap fit part, 14b seal seat part, 14c inner wall part, 15, 18 spring, 16 valve assembly, 17 plunger, 19 valve body, 20 washer, 21 communication hole, 22 O-ring, 23 screws, 100 turbocharger, 100a compressor, 100b turbine, 101 engine, 102 intake passage, 103 throttle valve, 104 intercooler, 105 exhaust passage, 106 well DOO gate valve, 107 an air bypass passage, 107a valve seat, 108, 108a piping, 109 power supply, 110 the inclined surface 111 stepped portion.

Claims

A solenoid part that is molded with resin and generates electromagnetic force when energized;
A valve body that is driven by the electromagnetic force and reciprocates in a direction to enter and exit from the solenoid unit;
A communication hole provided in the valve body and communicating between the inside and the outside through the valve body;
A seal ring that seals a gap between the solenoid portion and the outer periphery of the valve body;
A holder having a snap-fit portion attached by engaging with the solenoid portion, the holder being attached to the solenoid portion by the snap-fit portion and holding the seal ring on the outer peripheral side of the valve body;
An O-ring that seals between the solenoid member and the counterpart member to which the air bypass valve is attached, and that assists the engagement of the snap-fit portion with the reaction force compressed by the attachment to the counterpart member. An air bypass valve characterized by that.
The air bypass valve according to claim 1, wherein the O-ring assists engagement by urging the snap-fit portion in a radial direction with a compressed reaction force.
The air bypass valve according to claim 1, wherein the O-ring is compressed in an oblique direction by an inclined surface of the counterpart member.
The air bypass valve according to claim 1, wherein the O-ring assists the engagement by urging the snap-fit portion in the axial direction with a compressed reaction force.