JPH0798065A - Assist air control valve for engine - Google Patents

Abstract

PURPOSE:To surely intercept an air passage with simple construction by providing a seal part of valve having a tight contact part with a cylindrical part extending over the full circumference on the decided position after a valve element moves and a passage area becomes minimum by the cylindrical part and a valve port. CONSTITUTION:A seal member 26 which is a seal part fixed by adhesion or baking on the anti-valve-element side against the passage area control part 21a of a valve port 21, and for example formed into an inverse triangular section, is provided. An air passage area, namely air flow is controlled by means of the passage area control part 21a and a conical part 12. At the time of the condition forming the smallest passage area, the cylindrical part 22 of the valve element 11 is not yet in contact with the seal member 26. At the time of the condition extending the valve element 11 and passing a decided position, the seal member 26 comes tightly in contact with the outer circumference of the cylindrical part 22 of the valve element 11, and hence the air passage area becomes zero. The seal member 26 formed into a lip shape like an oil seal can be smoothly conformed to the surface of the cylindrical part 22 against motion of the valve element 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auxiliary air control valve for an engine which supplies air by bypassing a throttle valve during warm-up operation of an internal combustion engine for an automobile.

[0002]

2. Description of the Related Art FIG. 16 shows, for example, Japanese Examined Patent Publication No. 63-19695.
FIG. 6 is a cross-sectional view showing the structure of a conventional auxiliary air control valve shown in Japanese Patent Publication No. In the figure, 1 is an institution, and this institution 1
Intake air is supplied through the intake passage 2. Three
Is a throttle valve. Bypass passage 4 in intake passage 2
a and 4b are provided. This bypass passage is arranged so as to bypass the throttle valve 3. 5
Is a valve housing, and this valve housing 5 has an air inlet 6 and an air outlet 7 connected to the bypass passages 4a and 4b, and is formed in an internal air passage connecting these air outlets 6 and 7. It has a valve seat 9. The valve seat 9 has a valve opening 10 having a predetermined inner diameter. Reference numeral 11 denotes a valve element which is arranged so as to face the valve seat 9 and controls the passage area. Valve body 11
Is made of metal and has a conical portion 12 at its tip. Thirteen
Is a spring as a biasing means for biasing the valve element 11 in the valve opening direction. 14 is the valve body 11 and the spring 1
It is an actuator that moves against 3. This is a type that incorporates a thermowax that senses the temperature of the cooling water 15 from the engine 1 and expands and contracts accordingly. The actuator 14 is provided with an output rod 16 which is moved in and out by expansion and contraction of thermowax, and a cylinder 17 which guides the output rod 16. Reference numeral 29 is a cap portion for airtightly separating the inside and the outside of the valve housing 5.

Thus, in the warm-up operation and the like, the actuator 14 increases as the temperature of the cooling water 15 of the engine 1 rises.
Detects that, the valve body 11 is brought closer to the valve seat 9, the passage area of the internal air passage is reduced, the supply amount of auxiliary air is reduced, and when the predetermined temperature is reached, the supply amount of auxiliary air becomes zero. Therefore, the conical portion 12 is in contact with the valve opening 10 and the passage area is zero.

When the temperature of the cooling water 15 further rises, the thermowax in the actuator 14 further expands, causing the output rod 16 to project. Thus, this output rod 16
And the valve body 11 are elastically engaged with each other, and the cylindrical member 18 is attached to the output rod 16 even if the valve body 11 is in contact with the valve seat 9 and cannot further advance. 17 is slidably covered. This cylindrical member 1
The second spring 19 is arranged between the valve 8 and the valve body 11 to bias the valve body 11 in the valve closing direction. The second spring 19 causes the output rod 16 to move to the valve body 11
The engaging piece 20 is provided between these so as not to deviate.

The conventional auxiliary air control valve is constructed as described above, and after the temperature reaches a predetermined temperature, the actuator 14 further extends the output rod 16 to apply an undesired stress to the valve seat 9 via the valve body 11. However, there is a problem that such a structure is complicated, a large number of parts are required, and the production cost becomes high.

Therefore, as a means for solving these problems, for example, there is an auxiliary air control valve for an engine disclosed in Japanese Utility Model Laid-Open No. 63-105741. The structure of the auxiliary air control valve is shown in FIGS.
Shown in. In the figure, the same members as those in the conventional example are designated by the same reference numerals and the description thereof will be omitted. In the figure, reference numeral 21 is a circular valve opening, and 22 is a valve body 11 which can slide through the valve opening 21 and pass therethrough.
It is a cylindrical part. The cylindrical portion 22 is the cylinder 17
It is covered (but not a sliding guide). The tip of the output rod 16 is inserted into the small diameter hole 23 inside the valve body 11. As a result, the valve body 11 is guided and held. The air passage area is formed by the passage area control portion 21 a, which is one end portion of the valve opening 21, and the conical portion 12.

Here, the common sense that the valve body is pressed against the valve seat when the valve is closed as in the prior art example is overcome, and after the passage area is minimized (substantially zero). However, the valve body maintains its state so that it can be further advanced through the valve seat. That is, the actuator 14 moves the valve element 11 forward to the right due to the temperature rise of the cooling water 15, and the conical portion 12 of the valve element 11 moves forward into the valve opening 21 of the valve seat 9 to narrow the passage area and reduce the passage area to a predetermined value. At the temperature of, the maximum diameter portion (cylindrical portion 22) of the conical portion 12 is located at the valve port 21, and the passage area is the minimum (substantially zero). When the temperature further rises, the output rod 16 further pushes the valve body 11 to the right. At this time, the outer peripheral surface of the cylindrical portion 22 of the valve body 11 is the valve opening 2 of the valve seat 9.
Sliding on the inner peripheral surface of No. 1 allows the valve body 11 to move forward, and thus allows the output rod 16 to extend.

The actuator 14 is attached to the housing 5
Due to the misalignment of the cylinder 17 or the output rod 16 with respect to the valve port 21 due to the tolerance when mounted inside,
As shown in FIG. 18, the problem that the valve body 11 cannot move forward and backward smoothly inside the valve port 21 is solved between the outer peripheral surface of the cylinder 17 and the inner peripheral surface of the cylindrical portion 22 and the outer peripheral surface of the output rod 16 and the inside of the valve body. It is eliminated by providing an appropriate gap with the small-diameter hole 23.

In this way, the maximum diameter of the conical portion at the tip of the valve body is located at the valve opening at a predetermined temperature, and the cylindrical portion is provided at the rear portion of the conical portion following the maximum diameter portion. Since the valve body can be advanced in the valve opening while the minimum passage area is provided when the temperature exceeds the above temperature, the connection between the valve body and the output rod for operating the valve body can be simplified.

However, since the minute air leakage flow rate from the minimum passage area cannot be shut off, when it is desired to reduce the engine speed during idling, especially in a vehicle model with a small displacement, the absolute value of the air flow rate required for the idling operation itself. Therefore, the idle speed of the engine may be secured only by the leakage flow rate from the throttle valve.In such a case, the leakage flow rate from the bypass passage as described above should be set to zero, and unnecessary It is strongly desired to improve the fuel consumption rate by preventing the idle speed from increasing in view of the relationship between the vehicle grade and the fuel consumption rate.

In view of the above situation, the applicant of the present application is
In Japanese Patent Laid-Open No. 4-47163, there is proposed a structure shown in FIG. 19 in which a valve seat 9 is provided with an annular seal member which is made of an elastic material and which is in close contact with the outer peripheral surface of the valve body 11 over the entire circumference. In this auxiliary air control valve, reference numeral 24 represents a seal member which is a seal portion. The entire seal member 24 is formed in an annular shape from an elastic material such as a rubber material. The seal member 24 is fitted and fixed in the recess 9a formed in the valve opening of the valve seat 9. Further, a lip 25 that is in close contact with the cylindrical portion 22 of the valve body 11 is provided on the inner peripheral portion of the seal member 24. The lip 25 is formed so that its tip is angular, and the inner diameter of the seal member 24 at this tip portion is set to be smaller than the outer diameter of the cylindrical portion 22 of the valve body 11.

Therefore, when fully closed, the valve body 11 can be brought into close contact with the seal member 24 to shut off the air flow. When the valve body 11 is further advanced in the fully closed state, the valve body 1
1 causes the seal member 24 to be elastically deformed and fitted into the seal member 24, and the lip 25 is pressed against the cylindrical portion 22 by its elastic force. That is, in this state, the valve body 1
The outer peripheral side of 1 is sealed over the entire circumference, and the valve element 11 is elastically supported by the seal member 24.

[0013]

In the conventional structure shown in FIG. 19, since the flow rate is controlled by the passage area determined between the seal member 24 (for example, its lip 25) and the conical portion 12 of the valve body 11, the seal is formed. There is a problem in that the flow rate control accuracy is poor due to large variations in the dimensions of the member 24, changes in shape and dimensions due to repeated use, and large deformation of the entire member due to the influence of the fluid force of the air flow.

Further, in the conventional structure shown in FIG. 19, the lip 25 having a sealing action is provided at a position apart from the passage area control portion 21a of the valve opening to a certain extent. Since the process is completed at about 80 ° C., the position where the lip 25 and the cylindrical portion 22 of the valve body 11 first come into contact with each other corresponds to the temperature, and during normal flow rate control (during warm-up).
Therefore, it is necessary to determine the positions of the conical portion 12 of the valve body 10 and the passage area control portion 21a so that the lip 25 does not affect the shape of the conical portion 12 and the sealing member 24. However, there is a problem in that it is required, or a considerably high processing accuracy is required to form such a shape.

Further, the processing of the concave portion 9a of the valve seat 9 and the fixing of the seal member 24 are complicated. Further, since the valve body 11 is made of metal and is heavy, it is necessary to elastically support the valve body 11 by providing the seal member 24 with a certain thickness to improve the earthquake resistance. On the other hand, in the above-mentioned conventional example, since the spring 13 as the urging means is mounted between the inside of the valve seat 9 and the rear end of the cylindrical portion of the valve body 11, the space for accommodating the spring 13 becomes considerably large. However, there is a problem that the entire device becomes so large.

In view of the above conventional problems, it is an object of the present invention to provide an auxiliary air control valve in which variations in the size of the seal member are unlikely to occur and deformation due to use is minimized. In addition, an auxiliary device that facilitates the design and processing of the shape of the conical portion and the sealing portion in order to appropriately control the passage area by the sealing portion of the valve conical portion and the valve opening when the valve body moves. The purpose is to provide an air control valve. Further, another object of the present invention is to provide an auxiliary air control valve that can reduce the accommodation space of the biasing means of the valve body.

[0017]

The auxiliary air control valve for an engine according to the present invention basically has the following features. That is, in the invention according to claim 1, the valve body is closely contacted with the valve seat over substantially the entire circumference of the cylindrical portion at a predetermined position after the passage area is minimized between the cylindrical portion and the valve opening. A seal part having a portion to be provided is provided. Further, in the invention according to claim 2, a seal portion is provided in which a portion that faces the conical portion of the valve body and determines a passage area and a portion where the valve body moves and comes into close contact with the cylindrical portion are at the same location. It is provided. In the invention according to claim 3, a seal portion having elasticity is provided in the cylindrical portion of the valve body, and the outer diameter of the cylindrical portion including this seal portion is made larger than the inner diameter of the valve port. Further, in the invention according to claim 4, the valve seat and the cap for making the inside of the valve housing airtight from the outside are integrally formed, and the biasing means is provided between the inside of the cap and the tip of the valve body. It is arranged.

[0018]

In the invention described in claim 1 or 5, when the valve body is moved by the actuator, first, when the conical portion of the valve body passes through the valve opening of the valve seat, the passage area between the conical portion and the valve opening is reduced. Squeezed. When the valve body further moves, the cylindrical portion of the valve body passes through the valve opening, and the passage area is minimized between the cylindrical portion and the valve opening. Further, when the valve body moves inside the valve opening, the cylindrical portion comes into close contact with the seal portion, and the air flow is surely blocked. In this way, the minimum passage area is basically given by the valve port and the cylindrical portion, and therefore the precision of the shape for giving the minimum passage area as the seal portion is not required. In the invention described in claim 2, when the valve body moves and passes through the valve opening, first, the passage area is controlled by the conical portion of the valve body and the predetermined portion of the seal portion, and the valve body further advances in the valve opening. For example, since the cylindrical portion of the valve body is in close contact with the predetermined portion of the seal portion to shut off the circulating air, it is possible to reduce the difficulty of setting the positional relationship between the conical portion and the seal portion for flow rate control and shutoff. To do.

According to the third aspect of the present invention, when the valve element moves and passes through the valve opening, the passage area is first controlled between the conical portion of the valve element and the valve opening, and the valve element further moves. When the cylindrical portion of the valve body passes through the inside of the valve opening, the elastic seal portion provided on the outer periphery of the cylindrical portion is elastically deformed to closely contact the valve opening to block air flow. Therefore, similarly to the case of the second aspect, it is possible to reduce the difficulty of setting the positional relationship between the conical portion and the seal portion for controlling the flow rate and shutting off. In the invention described in claim 4,
The cap of the valve housing and the valve seat are integrated, and the urging means for urging the valve body in the valve opening direction is provided between the cap of the valve housing and the tip of the valve body. The space for is small. According to the invention of claim 6, in addition to the operation of the invention of claim 4, the guide portion contributes to preventing the displacement of the biasing means. In the invention according to claim 7, since the seal portion has a seal lip-like shape, the air flow can be blocked by the small-sized seal portion which can be easily attached.

In the invention according to the eighth aspect, since the seal portion is fixed to almost the entire valve opening, it becomes easy to manufacture a contact portion with the valve body cylindrical portion in the seal portion, and the seal portion falls off. It can be prevented. In the invention according to claim 9, since the seal portion or the valve body is coated with a resin having a low friction coefficient, adhesion between the valve body and the seal portion due to oil or the like can be prevented. According to the tenth and eleventh aspects of the present invention, since the valve element and the valve seat are made of resin, the inertial force due to the vibration of the valve element can be reduced, and the movement of the valve element within the valve opening is smoothed. According to the twelfth aspect of the present invention, since the seal portion is integrally attached to the attachment location, particularly in the same step, the manufacturing process for providing the seal portion is simplified. In the invention according to claim 13, since the inner diameter side of the valve port has an acute-angled cross section, the seal portion can be easily provided, and the shape and dimension accuracy thereof can be improved. According to a fourteenth aspect of the present invention, in addition to the configuration of the fourth aspect, a male thread coated with a microencapsulated adhesive is provided on the cap, and the male thread of the valve housing is screwed to the male thread. At this time, the microcapsules are destroyed and the adhesive spreads on the joint surface between the cap and the valve housing, which facilitates the assembling and secures the assembling strength. Claim 1
In the invention described in claim 5, in addition to the configuration described in claim 4,
Since the cylindrical portion and the plate portion for connecting the valve seat and the cap are provided, the connecting strength can be secured when the valve seat and the cap are integrated, and tightening when screwed to the valve housing Even if the torque increases, it can withstand it.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. Example 1 Example 1 will be described with reference to FIG. In the figure, the same or corresponding parts as those of the conventional one are designated by the same reference numerals and the description thereof will be omitted. In the figure, reference numeral 26 is a seal member that is fixed to the valve port 21 by adhesion or baking, and has a reverse triangular cross section in this example. Has been done. The seal member 26 is used for the passage area control unit 2 of the valve port 21.
It is provided closer to the valve body than 1a. Next, the operation will be described. The operation of the valve element 11 is similar to that of the above-mentioned conventional example.
The control of the air passage area (that is, the air flow rate) is performed as shown in FIG.
As shown in (a), the passage area control unit 21 as in the conventional example.
a and the conical portion 12. Next, a state in which the minimum passage area is formed is shown in FIG. At this point, the valve body 1
The cylindrical portion 22 of No. 1 and the seal member 26 are not yet in contact with each other. Further, FIG. 1C shows a state in which the valve body 11 has expanded and has moved past a predetermined position. At this point, the seal member 2
Since 6 is in close contact with the outer circumference of the cylindrical portion 22 of the valve body 11, the air passage area is zero. The lip-shaped seal member 26 such as an oil seal can be smoothly fitted to the surface of the cylindrical portion 22 with respect to the movement of the valve body 11, and can reliably block the air passage.

Further, since the engine warm-up is normally completed when the cooling water temperature is 80 ° C., the cooling water temperature is 80 ° C. or 100 ° C. at the position where the seal member 26 and the cylindrical portion 22 of the valve body 1 first contact. Corresponding to the temperature up to ℃, it is possible to reliably shut off the air passage after warming up and eliminate unnecessary air supply to the engine. In order to prevent the influence of the seal member 26 during normal flow rate control, the seal member 26 and the passage area control 21a need to be separated to some extent, but in the present invention, they are separated by a predetermined distance after the minimum passage area is reached. Since the seal member 26 is at the position, the seal member 2
The difficulty of setting the shape and size of the seal member 26 due to the fact that 6 itself becomes a factor that determines the flow rate during normal flow rate control is avoided. Since the state of FIG. 1B is a transient state, the time in this state is short and can be ignored with respect to the time in the idle state. Further, the conical portion 12 of the valve body 11
1 may be formed as a continuous and uniform surface as shown in FIG. 1, but as shown in FIG. 2, a stepped portion 12a may be formed at a substantially intermediate position in the axial direction of the conical portion 12, As a result, a fine flow rate control can be performed between the valve area 21 and the passage area controller 21a.

Embodiment 2 The seal member 26 in the above embodiment may have the shape shown in FIGS. That is, as shown in FIG. 3, the seal member 26A is extended to a range including the entire valve opening 21 and a hole 9b penetrating the valve seat 9 is provided to provide the seal member 26A.
Of the sealing member 2 as shown in FIG.
6B is simply extended to a range including the entire valve opening 21, or as shown in FIG. 5, the width of the valve opening 21 is narrowed to improve the formability of the lip 25 of the seal member 26C, thereby improving the valve seat 9
Can be thinned.

The shape of each seal member 26 can be variously set according to the force of the actuator and the set force of the spring 13. In other words, when these forces are small, a small lip 25 (the tip of which has an acute angle) is used so as not to impede the operation of the valve body 11, and when the forces are large, a gentle mountain-shaped protrusion (shown in FIG. 4). By so doing, the molding of the seal member 26 can be further facilitated.

Example 3 Example 3 is shown in FIG. In this embodiment, 26D is an elastic seal member made of rubber, which is integrally formed with the resin valve body 8 in the same step and is provided in the valve opening 21, and this sealing member 26D is the entire valve opening 21. And a lip 25 is formed at the end portion near the valve body. This lip 2
Reference numeral 5 has an inverted triangular cross section and has a shape of a seal lip of an oil seal. Here, the tip of the lip 25 serves as the passage area control portion 21a, and therefore, the portion where the passage area is controlled by the conical portion 12 of the valve body 11 and the valve opening 21 and the valve body 11 further advances and its cylinder Portion 22 and valve 21
The parts where the passage is blocked by and are the same. As a result, it is not necessary to separately manufacture a shape for controlling the passage area and a shape for blocking the passage, and it becomes easy to set the shape dimensions for controlling the passage area and blocking the passage.

Next, the operation will be described. The operation of the valve body 11 is similar to that described above. Control of the air passage area (that is, the air flow rate) is performed by the passage area control unit 21a and the conical portion 12 as shown in FIG. Then, when the temperature reaches the predetermined temperature, the maximum diameter portion of the conical portion 12 (the tip portion of the cylindrical portion 22) comes into contact with the passage area control portion 21a to be in a fully closed state. Shut off the supply of auxiliary air. The state at this time is shown in FIG.
Shown in (b). When the temperature further rises and the valve body 11 is moved forward, the valve body 11 moves to the seal member 2 as shown in FIG.
The 6D passage area control portion 21a is elastically deformed and fitted into the inside, so that the passage area can be smoothly moved while keeping the passage area at zero.

Another example of the third embodiment is shown in FIGS.
In this example, the valve port 21 of the valve seat 9 is wedge-shaped, that is, the inner diameter side of the cross section is an acute angle, and the seal member 26E is formed in a wedge shape according to the cross-sectional shape. The shapeability of E is improved to improve the shape dimension accuracy of the passage area control section 21a. Moreover, it is possible to suppress the deformation of the passage area control unit 21a due to the influence of the fluid force of the air flow, and to perform the flow rate adjustment with higher accuracy.

Fourth Embodiment A fourth embodiment will be described with reference to FIG. The description of the same configuration as the above-mentioned example is omitted. In the figure, 27 is an elastic seal member provided on the cylindrical portion 22 of the valve body 11. The elastic seal member 27 may be fixed to the cylindrical portion 22 by adhesion or baking, but in this embodiment, the elastic sealing member 27 is integrally fixed in the same step as the manufacturing of the cylindrical portion 22, thus simplifying the manufacturing process. ing. The outer diameter of the elastic seal member 27 is set to be larger than the inner diameter of the valve port 21. Next, the operation will be described. The movement of the valve element 11 is the same as that of the above-described embodiment, and when the valve element 11 is fully closed, the elastic seal member 27 of the valve element 11 comes into close contact with the valve opening 21 to shut off the supply of the auxiliary air. When the valve body 11 further advances, the elastic seal member 27 is elastically deformed and fitted into the valve port 21, so that the valve body 11 can move while keeping the passage area at zero. In this embodiment, by providing the valve body 11 with the elastic seal member 27, the portion of the valve opening 21 where the passage area is controlled by the conical portion 12 of the valve body 11 and the portion where the passage portion is blocked by the cylindrical portion 22 are the same. Can be a place.

Another example of the fourth embodiment is shown in FIG. In this example, the valve opening 21 is wedge-shaped, that is, by making the inner diameter side of the cross section of the valve opening 21 into an acute angle to reduce the contact area with the elastic seal member 27, the movement of the valve body 11 can be made smoother.

Fifth Embodiment A fifth embodiment will be described with reference to FIG. The same or corresponding parts as those already described in the figure are designated by the same reference numerals and the description thereof will be omitted. In the figure, 28 is a valve seat portion 9A and a cap portion 29.
It is an integrated part that connects and with four plate-shaped parts 30,
For example, it is made of a resin molded product. The integrated component 28 has a male thread 28a on the outer periphery coated with a microencapsulating adhesive, and is screwed to the female thread 5a of the valve housing 5 to be fixed while maintaining a sealing property. As the assembling means, the valve body 11 is attached to the output rod 16, and then the spring 13 which is the urging means is inserted between the valve body 11 and the inner surface of the cap portion 29. Attach to 5.

At this time, in order to prevent the spring 13 from falling off or being displaced, a spring guide portion 31 is provided inside the plate portion 30 as shown in FIG.
3 can be incorporated in advance. Also, the valve body 11
The spring receiving portion 11a of the
The ends of the can also be retained (eg by press fit, snap fit). After the integrated component 28 is assembled and adjusted to a predetermined position, the force of the spring 13 is applied to the integrated component 28, so that the microcapsule is reliably destroyed,
The sealing property can be maintained.

Sixth Embodiment In the fifth embodiment, when it is desired to surely block the leakage of the flow rate after the predetermined temperature is reached, the valve element 11 moves to a part of the inner diameter of the valve seat portion 9A as shown in FIG. The seal member 26 may be provided in close contact with the entire circumference of the cylindrical portion 22 at a predetermined position (in other words, a predetermined cooling water temperature) after the minimum passage area is formed by the cylindrical portion 22 and the valve port 21. The seal member 26 has the same seal lip shape as the seal member 6 of the first embodiment.

Embodiment 7 In this embodiment, the integral part 28 of the fifth embodiment is constructed as shown in FIG. 14, and this integral part 28A is a cylinder having an outer diameter smaller than the male screw 28a as shown in FIG. It has a shaped portion 32 and an air circulation hole 33 provided in the shaped portion 32,
Plate portions 30 are provided radially from the cylindrical portion 32. This integral part 28A includes a valve seat 9A and a cap 2
9 is integrally formed by injection molding of resin or metal powder, and a specially-processed microencapsulated adhesive that also serves as a sealant and a lock agent is applied to the male screw 28a and fixed to the female screw 5a of the valve housing 5. is doing.

As shown above, the valve seat 9A and the cap 2
When 9 is connected to the cylindrical part 32 and the plate-shaped part 30 to form an integrated part 28A, the connection strength is higher than that of the integrated part 28 of the fifth embodiment, which is connected only to the plate-shaped part 30. Therefore, even if the tightening torque becomes large due to the variation in the application amount of the microencapsulated adhesive and the variation in the shape dimensions of the male screw and the female screw, it is possible to sufficiently deal with the tightening torque, and it is possible to integrally tighten the valve housing 5. . In this way, the integral part 28A is provided with the cylindrical portion 32 having an inner diameter smaller than that of the male screw 28a, and the plurality of air circulation holes 33 are provided in the circumferential direction of the cylindrical portion 32 to connect the air inlets and outlets 6, 7 to each other. There is. The air flow hole 33 may be determined in consideration of the pressure loss so that the auxiliary air control valve can secure the maximum flow rate, and the shape need not be circular. Also, the division in the circumferential direction by the plate-shaped portion 30 does not have to be four, and it may be determined in consideration of the margin of strength with respect to mold splitting and tightening torque.

Embodiment 8 The integrated part 28A of Embodiment 7 can be applied to a type using two springs 13 and 19 as shown in FIG. 15 (corresponding to the conventional one shown in FIG. 16).

Ninth Embodiment In the above-described embodiments (especially Embodiments 1 to 4 and 6), the valve element 11 is made of a resin, and in particular, it is made of a resin containing a solid lubricant such as molybdenum disulfide, so that the vibration is reduced. The inertial force of the valve element 11 due to
Sliding resistance when moving the inside of the valve opening 21 by elastically deforming 1a can be reduced. That is, the passage area control unit 2
The difference (tightening margin) between the inner diameter of 1a and the outer diameter of the cylindrical portion 22 of the valve body 11 can be reduced, and the compressive stress applied to the passage area control portion 21a is reduced. Further, since sliding friction with the valve element 11 is reduced, it is possible to suppress changes in shape and dimension even during long-term use, maintain stable flow rate adjustment accuracy, and enhance reliability as an auxiliary air control valve.

As a result, the conical portion 12 of the valve body can be easily manufactured, and the thickness and width of the seal member on the valve seat side can be reduced. This can be achieved even if the valve seat 9 is made of resin containing a solid lubricant such as molybdenum disulfide (especially in Example 4). In addition, when the valve seat 9 is made of resin in the first to third embodiments, it is possible to improve the adhesiveness when fixing each seal member and to facilitate the production of the groove or hole for preventing falling off.

Embodiment 10 In the above-mentioned embodiments (especially Embodiments 1 to 4 and 6), the seal member is formed of low-adhesive fluororubber, and the cylindrical portion 22 of the valve body 11 (in Embodiment 4, the cylindrical portion) By applying a resin coating with a low friction coefficient to the sealing member 27) provided on 22, the movement of the valve body 11 inside the valve opening 21 is made smooth and the adhesion due to carbon deposit or oil passing through the air passage is prevented. it can. This means that valve 2
1 or the sealing member may be coated with a resin having a low coefficient of friction.

[0039]

According to the invention described in claim 1 or 5, the cylindrical portion of the valve body and the valve opening come into close contact with each other over a substantially entire circumference of the cylindrical portion at a predetermined position after the passage area is minimized. Since the seal portion is provided, it is easy to set the shape and dimension for controlling the passage area by the conical portion of the valve body and the valve opening, and the air flow rate can be controlled and shut off reliably. According to the second aspect of the invention, the seal portion is provided in which the portion that faces the conical portion of the valve body and determines the passage area and the portion where the valve body moves and comes into close contact with the cylindrical portion are in the same location. Therefore, it is easier to set the dimensions for controlling the flow rate until the cylindrical part of the valve body comes into close contact with the seal part, compared to using these parts as separate parts.
Moreover, the air flow rate can be controlled and shut off reliably. According to the invention described in claim 3, since the seal member having elasticity is provided in the cylindrical portion of the valve body, when the passage area is controlled between the valve body and the valve mouth, the shape inside the valve mouth is carefully designed. The trouble can be avoided, and the flow rate can be controlled and shut off reliably. According to the invention described in claim 4, since the urging means is arranged between the cap and the valve body by integrally forming the cap and the valve seat, the space for the urging means is small, and the entire apparatus is downsized. it can.

According to the sixth aspect of the invention, since the guide portion of the biasing means is provided on the inner diameter of the integral part, the position of the biasing means may move or drop during use. It is prevented. According to the invention of claim 7, since the seal portion has a seal lip-like shape, the seal portion can be downsized and the air flow can be surely blocked. According to the invention as set forth in claim 8, since the seal portion is fixed to almost the entire valve opening, the fixability and the moldability of the seal portion are improved. According to the invention as set forth in claim 9, since the resin coating is applied to the seal portion and the valve body, it is possible to prevent problems such as adhesion between the valve body and the seal portion due to carbon deposits or oil. Thus, the movement of the valve body can be made smooth.

According to the twelfth aspect of the invention, since the seal portion is integrally provided, the manufacturing process can be simplified. According to the thirteenth aspect of the present invention, since the inner diameter side of the cross section of the valve opening is formed into an acute angle, the sliding resistance with the valve body can be reduced, and the shape and dimension accuracy of the seal portion is improved. According to the fourteenth aspect of the invention, since the male thread of the cap is coated with the microencapsulated adhesive, the work is easy when the cap is attached to the valve housing, and the sealing property can be secured. According to the fifteenth aspect of the invention, since the cap and the valve seat are connected by the cylindrical portion and the plate-shaped portion, the connection strength can be increased, and the tightening torque when attaching the integrated component to the valve housing is reduced. It can be installed even if it grows.

[Brief description of drawings]

FIG. 1 is a diagram showing Embodiment 1 of the present invention, in which (a)-
FIG. 3C is a cross-sectional view of a main part showing each operating state.

FIG. 2 is a sectional view of an essential part showing a modified example of the first embodiment of the present invention.

FIG. 3 is a cross-sectional view of essential parts showing Embodiment 2 of the present invention.

FIG. 4 is a cross-sectional view of essential parts showing Embodiment 2 of the present invention.

FIG. 5 is a cross-sectional view of essential parts showing Embodiment 2 of the present invention.

FIG. 6 is a diagram showing Embodiment 3 of the present invention, in which (a)-
FIG. 3C is a cross-sectional view of a main part showing each operating state.

FIG. 7 is a main-portion cross-sectional view showing a modification of Example 3.

FIG. 8 is a main-portion cross-sectional view showing a modification of Example 3.

FIG. 9 is a cross-sectional view of essential parts showing Embodiment 4 of the present invention.

FIG. 10 is a main-portion cross-sectional view showing a modification of Example 4.

11A and 11B are views showing a fifth embodiment of the present invention, in which FIG. 11A is a sectional view and FIG. 11B is a perspective view of an integral part.

FIG. 12 shows an improvement of the integral part of FIG.

FIG. 13 is a partial sectional view showing Embodiment 6 of the present invention.

FIG. 14 is a perspective view of an integrated component showing Embodiment 7 of the present invention.

FIG. 15 is a cross-sectional view of essential parts showing Embodiment 8 of the present invention.

FIG. 16 is a sectional view showing a conventional auxiliary air control valve.

FIG. 17 is a cross-sectional view showing another example of the conventional auxiliary air control valve.

18 is a partially enlarged view of the auxiliary air control valve of FIG.

FIG. 19 is a partially enlarged sectional view showing still another example of the conventional auxiliary air control valve.

[Explanation of symbols]

1 engine 2 intake passage 3 throttle valve 4a, 4b bypass passage 5 valve housing 6 air inlet 7 air outlet 9 valve seat 9A valve seat portion 11 valve body 12 cone portion 13 spring (biasing means) 14 actuator 15 cooling water 21 valve opening 22 Cylindrical part 26, 26A, 26B, 26C, 26D, 26E Seal member (seal part) 27 Elastic seal member 28, 28A Integrated component 29 Cap part 30 Plate part 31 Guide part 32 Cylindrical part 33 Air flow hole

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[Procedure amendment]

[Submission date] December 14, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction content]

[Document name] Statement

Title of engine auxiliary air control valve

[Claims]

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auxiliary air control valve for an engine which supplies air by bypassing a throttle valve during warm-up operation of an internal combustion engine for an automobile.

[0002]

2. Description of the Related Art FIG. 16 shows, for example, Japanese Patent Publication No. 63-19695.
FIG. 6 is a cross-sectional view showing the structure of a conventional auxiliary air control valve shown in Japanese Patent Publication No. In the figure, 1 is an institution, and this institution 1
Intake air is supplied through the intake passage 2. Three
Is a throttle valve. Bypass passage 4 in intake passage 2
a and 4b are provided. This bypass passage is arranged so as to bypass the throttle valve 3. 5
Is a valve housing, and this valve housing 5 has an air inlet 6 and an air outlet 7 connected to the bypass passages 4a and 4b, and is formed in an internal air passage connecting these air outlets 6 and 7. It has a valve seat 9. The valve seat 9 has a valve opening 10 having a predetermined inner diameter. Reference numeral 11 denotes a valve element which is arranged so as to face the valve seat 9 and controls the passage area. Valve body 11
Is made of metal and has a conical portion 12 at its tip. Thirteen
Is a spring as a biasing means for biasing the valve element 11 in the valve opening direction. 14 is the valve body 11 and the spring 1
It is an actuator that moves against 3. This is a machine
This is a type that incorporates a thermowax that senses the temperature of the cooling water 15 from the function 1 and expands and contracts accordingly. The actuator 14 is provided with an output rod 16 which is moved in and out by expansion and contraction of thermowax, and a cylinder 17 which guides the output rod 16. Reference numeral 29 is a cap portion for airtightly separating the inside and the outside of the valve housing 5.

Thus, in the warm-up operation and the like, the actuator 14 increases as the temperature of the cooling water 15 of the engine 1 rises.
Detects that, the valve body 11 is brought closer to the valve seat 9, the passage area of the internal air passage is reduced, the supply amount of auxiliary air is reduced, and when the predetermined temperature is reached, the supply amount of auxiliary air becomes zero. Therefore, the conical portion 12 is in contact with the valve opening 10 and the passage area is zero.

When the temperature of the cooling water 15 further rises, the thermowax in the actuator 14 further expands, causing the output rod 16 to project. Thus, this output rod 16
And the valve body 11 are elastically engaged with each other, and the output rod 16 is allowed to advance even if the valve body 11 contacts the valve seat 9 and cannot move any further . That is, out
The cylindrical member 18 is attached to the force rod 16, and the cylindrical member 1
8 is slidably covered on the cylinder 17. A second spring 19 is arranged between the cylindrical member 18 and the valve body 11 to bias the valve body 11 in the valve closing direction. The second spring 19 provides an engaging piece 20 between the output rod 16 and the valve body 11 so that the valve body 11 does not deviate from the output rod 16.

The conventional auxiliary air control valve is constructed as described above, and after the temperature reaches a predetermined temperature, the actuator 14 further extends the output rod 16 to apply an undesired stress to the valve seat 9 via the valve body 11. However, such a structure is complicated and requires a large number of parts, which not only increases the production cost but also increases the total cost of the device.
There was a problem that the body became large .

Therefore, as a means for solving these problems, for example, there is an auxiliary air control valve for an engine disclosed in Japanese Utility Model Laid-Open No. 63-105741. The structure of the auxiliary air control valve is shown in FIGS.
Shown in. In the figure, the same members as those in the conventional example are designated by the same reference numerals and the description thereof will be omitted. In the figure, reference numeral 21 is a circular valve opening, and 22 is a valve body 11 which can slide through the valve opening 21 and pass therethrough.
It is a cylindrical part. The cylindrical portion 22 is the cylinder 17
It is covered (but not a sliding guide). The tip of the output rod 16 is inserted into the small diameter hole 23 inside the valve body 11. As a result, the valve body 11 is guided and held. The air passage area is formed by the passage area control portion 21 a, which is one end portion of the valve opening 21, and the conical portion 12.

Here, the common sense that the valve body is pressed against the valve seat when the valve is closed as in the prior art example is overcome, and after the passage area is minimized (substantially zero). However, the valve body maintains its state so that it can be further advanced through the valve seat. That is, the actuator 14 moves the valve element 11 forward to the right due to the temperature rise of the cooling water 15, and the conical portion 12 of the valve element 11 moves forward into the valve opening 21 of the valve seat 9 to narrow the passage area and reduce the passage area to a predetermined value. At the temperature of, the maximum diameter portion (cylindrical portion 22) of the conical portion 12 is located at the valve port 21, and the passage area is the minimum (substantially zero). When the temperature further rises, the output rod 16 further pushes the valve body 11 to the right. At this time, the outer peripheral surface of the cylindrical portion 22 of the valve body 11 is the valve opening 2 of the valve seat 9.
Sliding on the inner peripheral surface of No. 1 allows the valve body 11 to move forward, and thus allows the output rod 16 to extend.

The actuator 14 is attached to the housing 5
Due to the misalignment of the cylinder 17 or the output rod 16 with respect to the valve port 21 due to the tolerance when mounted inside,
The problem of smooth valve element 11 to the valve port 21 can not be forward and backward, the outer peripheral surface and the valve body and between the output rod 16 between the outer peripheral surface and the inner peripheral surface of the cylindrical portion 22 of the cylinder 17 as shown in FIG. 18 An appropriate gap is provided between the small-diameter hole 23 inside and the hole 23 to eliminate it.

In this way, the maximum diameter of the conical portion at the tip of the valve body is located at the valve opening at a predetermined temperature, and the cylindrical portion is provided at the rear portion of the conical portion following the maximum diameter portion. Since the valve body can be advanced in the valve opening while the minimum passage area is provided when the temperature exceeds the above temperature, the connection between the valve body and the output rod for operating the valve body can be simplified.

However, since the minute air leakage flow rate from the minimum passage area cannot be shut off, when it is desired to reduce the engine speed during idling, especially in a vehicle model with a small displacement, the absolute value of the air flow rate required for the idling operation itself. Therefore, the idle speed of the engine may be secured only by the leakage flow rate from the throttle valve.In such a case, the leakage flow rate from the bypass passage as described above should be set to zero, and unnecessary It is strongly desired to improve the fuel consumption rate by preventing the idle speed from increasing in view of the relationship between the vehicle grade and the fuel consumption rate.

In view of the above situation, the applicant of the present application is
In Japanese Patent Laid-Open No. 4-47163, there is proposed a structure shown in FIG. 19 in which a valve seat 9 is provided with an annular seal member which is made of an elastic material and which is in close contact with the outer peripheral surface of the valve body 11 over the entire circumference. In this auxiliary air control valve, reference numeral 24 represents a seal member which is a seal portion. The entire seal member 24 is formed in an annular shape from an elastic material such as a rubber material. The seal member 24 is fitted and fixed in the recess 9a formed in the valve opening of the valve seat 9. Further, a lip 25 that is in close contact with the cylindrical portion 22 of the valve body 11 is provided on the inner peripheral portion of the seal member 24. The lip 25 is formed so that its tip is angular, and the inner diameter of the seal member 24 at this tip portion is set to be smaller than the outer diameter of the cylindrical portion 22 of the valve body 11.

Therefore, when fully closed, the valve body 11 can be brought into close contact with the seal member 24 to shut off the air flow. When the valve body 11 is further advanced in the fully closed state, the valve body 1
1 causes the seal member 24 to be elastically deformed and fitted into the seal member 24, and the lip 25 is pressed against the cylindrical portion 22 by its elastic force. That is, in this state, the valve body 1
The outer peripheral side of 1 is sealed over the entire circumference, and the valve element 11 is elastically supported by the seal member 24.

[0013]

In the conventional structure shown in FIG. 19, since the flow rate is controlled by the passage area determined between the seal member 24 (for example, its lip 25) and the conical portion 12 of the valve body 11, the seal is formed. Due to variations in the dimensions of the member 24, changes in shape and dimensions due to repeated use, and deformation of the entire member due to the influence of the fluid force of the airflow , the flow rate
There was a problem that the control accuracy deteriorates .

Further, the processing of the recess 9a of the valve seat 9 and the fixing of the seal member 24 are complicated. Further, since the valve body 11 is made of metal and is heavy, it is necessary to elastically support the valve body 11 by providing the seal member 24 with a certain thickness to improve the earthquake resistance. On the other hand, in the above-mentioned conventional example, since the spring 13 as the urging means is mounted between the inside of the valve seat 9 and the rear end of the cylindrical portion of the valve body 11, the space for accommodating the spring 13 becomes considerably large. However, there is a problem that the entire device becomes so large.

In view of the above conventional problems, the present invention is simple
With a unique structure, the bypass passage of the engine can be reliably blocked.
In addition, the purpose is to provide a small and lightweight auxiliary air control valve with good earthquake resistance and good flow rate controllability . Further, another object of the present invention is to provide an auxiliary air control valve that can reduce the accommodation space of the biasing means of the valve body.

[0016]

The auxiliary air control valve for an engine according to the present invention basically has the following features. That is, in the invention according to claim 1, the valve body is brought into close contact with the valve seat over the entire circumference of the cylindrical portion at a predetermined position after the movement of the valve body to minimize the passage area between the cylindrical portion and the valve opening. A seal portion having a portion is provided. Further, in the invention according to claim 2, a seal portion is provided in which a portion that faces the conical portion of the valve body and determines a passage area and a portion where the valve body moves and comes into close contact with the cylindrical portion are at the same location. It is provided. In the invention according to claim 3, a seal portion having elasticity is provided in the cylindrical portion of the valve body, and the outer diameter of the cylindrical portion including this seal portion is made larger than the inner diameter of the valve port. Further, in the invention according to claim 4, the valve seat and the cap for making the inside of the valve housing airtight from the outside are integrally formed, and the biasing means is provided between the inside of the cap and the tip of the valve body. It is arranged.

[0017]

In the invention according to any one of claims 1 , 5, and 16 , the valve body is moved by the actuator, and when the conical portion of the valve body first passes through the valve opening of the valve seat, the conical portion and the valve opening are separated from each other. The passage area is narrowed between them. When the valve body further moves, the cylindrical portion of the valve body passes through the valve opening, and the passage area is minimized between the cylindrical portion and the valve opening. Further, when the valve body moves inside the valve opening, the cylindrical portion comes into close contact with the seal portion, and the air flow is surely blocked . In the invention described in 請 Motomeko 2, when passing through the valve port to move the valve body, the passage area control is performed first by the predetermined portion of the conical portion and the sealing portion of the valve body, a further valve body in the valve port If proceeding, the cylindrical portion of the valve body will come into close contact with the predetermined portion of the seal portion to shut off the circulating air, so that it is difficult to set the positional relationship between the conical portion and the seal portion for flow rate control and shutoff. Decrease.

According to the third aspect of the present invention, when the valve element moves and passes through the valve opening, the passage area is first controlled between the conical portion of the valve element and the valve opening, and the valve element further moves. When the cylindrical portion of the valve body passes through the inside of the valve opening, the elastic seal portion provided on the outer periphery of the cylindrical portion is elastically deformed to closely contact the valve opening to block air flow. Therefore, similarly to the case of the second aspect, it is possible to reduce the difficulty of setting the positional relationship between the conical portion and the seal portion for controlling the flow rate and shutting off. In the invention described in claim 4,
The cap of the valve housing and the valve seat are integrated, and the urging means for urging the valve body in the valve opening direction is provided between the cap of the valve housing and the tip of the valve body. The space for is small. According to the invention of claim 6, in addition to the operation of the invention of claim 4, the guide portion contributes to preventing the displacement of the biasing means. In the invention described in claim 7, since the seal portion is a seal lip shape, may without interruption of the air flow by the small type sealing portion.

According to the invention described in claim 8, since the seal portion is fixed to almost the entire valve opening, it becomes easy to manufacture a contact portion with the valve body cylindrical portion in the seal portion, and the seal portion comes off. It can be prevented. In the invention according to claim 9, since the low coefficient of friction resin coating is applied such as sticking between the valve body and the seal portion due to the carbon deposit and for oil is prevented in the sealed portion. According to the tenth aspect of the invention, since the valve element and the valve seat are made of resin, the inertial force due to the vibration of the valve element can be reduced, and the movement of the valve element within the valve opening is smoothed. According to the invention of claim 11, the valve seat is made of resin.
To improve the stickiness when fixing the seal part with and to prevent it from falling off
The grooves and holes can be easily formed. According to the twelfth aspect of the present invention, since the seal portion is integrally attached to the attachment location, particularly in the same step, the manufacturing process for providing the seal portion is simplified. Claim 1
In the invention described in 3, since the inner diameter side of the valve opening has an acute-angled cross section, the seal portion can be easily provided and the shape and dimension accuracy thereof can be improved. According to a fourteenth aspect of the present invention, in addition to the configuration of the fourth aspect, a male thread coated with a microencapsulated adhesive is provided on the cap, and the male thread of the valve housing is screwed to the male thread. At this time, the microcapsules are destroyed and the adhesive spreads on the joint surface between the cap and the valve housing, which facilitates the assembling and secures the assembling strength. According to the invention of claim 15,
In addition to the structure according to claim 4, since the cylindrical portion and the plate portion for connecting the valve seat and the cap are provided, the connection strength when the valve seat and the cap are integrated can be secured. Even if the tightening torque when screwed into the valve housing becomes large, it can sufficiently withstand it. Claim 1
In the inventions described in 7, 18, 19, and 20, the seal portion is low.
Made of adhesive fluororubber, and is used for the cylinder of valve body and valve of valve seat.
The mouth is coated with a resin with a low coefficient of friction, or
The valve body and valve seat are made of resin containing solid lubricant.
As in the invention described in 9, the movement of the valve body in the valve opening is smoother.
Adhesion due to carbon deposits, oil, etc.
Is prevented.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. Example 1 Example 1 will be described with reference to FIG. In the figure, the same or corresponding parts as those of the conventional one are designated by the same reference numerals and the description thereof will be omitted. In the figure, reference numeral 26 is a seal member that is fixed to the valve port 21 by adhesion or baking, and has a reverse triangular cross section in this example. Has been done. The seal member 26 is used for the passage area control unit 2 of the valve port 21.
It is provided closer to the valve body than 1a. Next, the operation will be described. The operation of the valve element 11 is similar to that of the above-mentioned conventional example.
The control of the air passage area (that is, the air flow rate) is performed as shown in FIG.
As shown in (a), the passage area control unit 21 as in the conventional example.
a and the conical portion 12. Next, a state in which the minimum passage area is formed is shown in FIG. At this point, the valve body 1
The cylindrical portion 22 of No. 1 and the seal member 26 are not yet in contact with each other. Further, FIG. 1C shows a state in which the valve body 11 has expanded and has moved past a predetermined position. At this point, the seal member 2
Since 6 is in close contact with the outer circumference of the cylindrical portion 22 of the valve body 11, the air passage area is zero. The lip-shaped seal member 26 such as an oil seal can be smoothly fitted to the surface of the cylindrical portion 22 with respect to the movement of the valve body 11, and can reliably block the air passage.

Further, since the engine warm-up is normally completed when the cooling water temperature is about 80 ° C., the seal member 26 and the valve body 11 are
The position where the cooling water temperature is 80
Corresponding to the temperature of up to 100 ° C. or 100 ° C., the air passage can be surely shut off after warming up, and unnecessary supply of air to the engine can be eliminated. In order to prevent the influence of the seal member 26 during normal flow rate control,
Although it is necessary to separate the sealing member 26 and the passage area control 21a to some extent, in the present invention, since the sealing member 26 is located at a position separated by a predetermined distance after the minimum passage area is reached, the sealing member 26 itself does not have to be used during normal flow rate control. The difficulty of setting the shape and size of the seal member 26 due to the factor that determines the flow rate is avoided. Since the state of FIG. 1B is a transient state, the time in this state is short and can be ignored with respect to the time in the idle state. Further, the conical portion 12 of the valve body 11 may be formed as a continuous and uniform surface as shown in FIG. 1, but as shown in FIG.
The shape may be formed in two or more steps , whereby the valve opening 2
A fine flow rate control can be performed with the first passage area control unit 21a.

Embodiment 2 The seal member 26 in the above-mentioned Embodiment 1 may be formed in the shape shown in FIGS. That is, as shown in FIG. 3, the seal member 26A is extended to a range including the entire valve opening 21 and a hole 9b penetrating the valve seat 9 is provided to provide the seal member 26A.
In order to prevent A from falling off, as shown in FIG. 4, the seal member 26B is simply extended to the range including the entire valve opening 21, or as shown in FIG. 26C to improve the moldability of the lip 25, the valve seat 9
Can be thinned.

The shape of each seal member 26 can be variously set according to the force of the actuator 14 and the set force of the spring 13. That is, when these forces are small, the valve body 11 is formed as a small lip 25 (the tip portion has an acute angle).
Of the sealing member 26 can be more easily formed by not hindering the above operation and by using a gentle mountain-shaped projection (as shown in FIG. 4) when the force is large.

Example 3 Example 3 is shown in FIG. 26D in this embodiment is molded integrally with the resin-made seat 9 in the same process, with elastic of some sealing member provided in the valve port 21, the sealing member 2
6D is fixed to the entire valve opening 21, and a lip 25 is formed at the end portion near the valve body. The lip 25 has an inverted triangular cross section and has a shape of a seal lip of an oil seal. Here, the tip of the lip 25 serves as the passage area control portion 21a, and therefore the conical portion 1 of the valve body 11 is formed.
The portion where the passage area is controlled by 2 and the valve opening 21 and the portion where the valve body 11 is further advanced and the passage is blocked by the cylindrical portion 22 and the valve opening 21 are the same location. As a result, it is not necessary to separately manufacture a shape for controlling the passage area and a shape for blocking the passage, and it becomes easy to set the shape dimensions for controlling the passage area and blocking the passage.

Next, the operation will be described. The operation of the valve body 11 is similar to that described above. Control of the air passage area (that is, the air flow rate) is performed by the passage area control unit 21a and the conical portion 12 as shown in FIG. Then, when the temperature reaches the predetermined temperature, the maximum diameter portion of the conical portion 12 (the tip portion of the cylindrical portion 22) comes into contact with the passage area control portion 21a to be in a fully closed state. Shut off the supply of auxiliary air. The state at this time is shown in FIG.
Shown in (b). When the temperature further rises and the valve body 11 is moved forward, the valve body 11 moves to the seal member 2 as shown in FIG.
The 6D passage area control portion 21a is elastically deformed and fitted into the inside, so that the passage area can be smoothly moved while keeping the passage area at zero.

Another example of the third embodiment is shown in FIGS.
In this example, the valve port 21 of the valve seat 9 is wedge-shaped, that is, the inner diameter side of the cross section is an acute angle, and the seal member 26E is formed in a wedge shape according to the cross-sectional shape. and improve the moldability of 26 E, thereby improving the geometry accuracy of the passage area control unit 21a. Moreover, it is possible to suppress the deformation of the passage area control unit 21a due to the influence of the fluid force of the air flow, and to perform the flow rate adjustment with higher accuracy.

Fourth Embodiment A fourth embodiment will be described with reference to FIG. The description of the same configuration as the above-mentioned example is omitted. In the figure, 27 is an elastic seal member provided on the cylindrical portion 22 of the valve body 11. The elastic seal member 27 may be fixed to the cylindrical portion 22 by adhesion or baking, but in this embodiment,
It is integrally fixed in the same process as the manufacturing of the valve body 11 ,
The manufacturing process is simplified. The outer diameter of the elastic seal member 27 is set to be larger than the inner diameter of the valve port 21. Next, the operation will be described. The movement of the valve element 11 is the same as that of the above-described embodiment, and when the valve element 11 is fully closed, the elastic seal member 27 of the valve element 11 comes into close contact with the valve opening 21 to shut off the supply of the auxiliary air. When the valve body 11 further advances, the elastic seal member 27
Is elastically deformed to be fitted into the valve port 21 and the valve body 11 can move while keeping the passage area at zero. In this embodiment, by providing the valve body 11 with the elastic seal member 27, the portion of the valve opening 21 where the passage area is controlled by the conical portion 12 of the valve body 11 and the portion where the passage portion is blocked by the cylindrical portion 22 are the same. Can be a place.

Another example of the fourth embodiment is shown in FIG. In this example, the valve opening 21 is wedge-shaped, that is, by making the inner diameter side of the cross section of the valve opening 21 into an acute angle to reduce the contact area with the elastic seal member 27, the movement of the valve body 11 can be made smoother.

Fifth Embodiment A fifth embodiment will be described with reference to FIG. The same or corresponding parts as those already described in the figure are designated by the same reference numerals and the description thereof will be omitted. In the figure, 28 is a valve seat portion 9A and a cap portion 29.
It is an integrated part that connects and with four plate-shaped parts 30,
For example, it is made of a resin molded product. This integrated component 28 has a special feature that serves as a sealant and a lock agent on the male screw 28a on the outer periphery.
A specially processed micro-encapsulated adhesive is applied, and the micro-encapsulated adhesive is screwed onto the female screw 5a of the valve housing 5 and fixed while maintaining the sealing property. As the assembling means, the valve body 11 is attached to the output rod 16, and then the spring 13 which is the urging means is inserted between the valve body 11 and the inner surface of the cap portion 29. Attach to 5.

At this time, in order to prevent the spring 13 from falling off or being displaced, a spring guide portion 31 is provided inside the plate portion 30 as shown in FIG.
3 can be incorporated in advance. Also, the valve body 11
The spring receiving portion 11a of the
The ends of the can also be retained (eg by press fit, snap fit). After the integrated component 28 is assembled and adjusted to a predetermined position, the force of the spring 13 is applied to the integrated component 28, so that the microcapsule is reliably destroyed,
The sealing property can be maintained.

Sixth Embodiment In the fifth embodiment, when it is desired to surely block the leakage of the flow rate after the predetermined temperature is reached, the valve element 11 moves to a part of the inner diameter of the valve seat portion 9A as shown in FIG. The seal member 26 may be provided in close contact with the entire circumference of the cylindrical portion 22 at a predetermined position (in other words, a predetermined cooling water temperature) after the minimum passage area is formed by the cylindrical portion 22 and the valve port 21. The sealing member 26 is the same seal lip shape and the sealing member 2 6 of the first embodiment. Also, the valve
The valve opening 21 of the seat 9A has a valve body 11 similar to that of the third embodiment.
A portion that faces the conical portion 12 and determines the passage area;
The part where the valve body 11 moves and is in close contact with the cylindrical part 22 is the same
A seal member may be provided at a certain position, or
An elastic seal is applied to the cylindrical portion 22 of the valve body 11 as in the fourth embodiment.
By providing a member, the leakage of the flow rate at the time of fully closing is secured.
Can be shut off.

Embodiment 7 In this embodiment, the integral part 28 of the above-mentioned fifth embodiment is constructed as shown in FIG. 14, and this integral part 28A is a cylinder having an outer diameter smaller than the male screw 28a as shown in FIG. It has a shaped portion 32 and an air circulation hole 33 provided in the shaped portion 32,
Plate portions 30 are provided radially from the cylindrical portion 32. This integral part 28A includes a valve seat 9A and a cap 2
9 is integrally formed by injection molding of resin or metal powder, and a specially-processed microencapsulated adhesive that also serves as a sealant and a lock agent is applied to the male screw 28a and fixed to the female screw 5a of the valve housing 5. is doing.

[0033] the valve seat as the upper-out portion 9A and the cap part 2
When 9 is connected to the cylindrical part 32 and the plate-shaped part 30 to form an integrated part 28A, the connection strength is higher than that of the integrated part 28 of the fifth embodiment, which is connected only to the plate-shaped part 30. Therefore, even if the tightening torque becomes large due to the variation in the application amount of the microencapsulated adhesive and the variation in the shape dimensions of the male screw and the female screw, it is possible to sufficiently deal with the tightening torque, and it is possible to integrally tighten the valve housing 5. . In this way, the integral part 28A is provided with the cylindrical portion 32 having an inner diameter smaller than that of the male screw 28a, and the plurality of air circulation holes 33 are provided in the circumferential direction of the cylindrical portion 32 to connect the air inlets and outlets 6, 7 to each other. There is. The air flow hole 33 may be determined in consideration of the pressure loss so that the auxiliary air control valve can secure the maximum flow rate, and the shape need not be circular. Also, the division in the circumferential direction by the plate-shaped portion 30 does not have to be four, and it may be determined in consideration of the margin of strength with respect to mold splitting and tightening torque.

Embodiment 8 The integral part 28A of Embodiment 7 can be applied to a type using two springs 13 and 19 as shown in FIG. 15 (corresponding to the conventional one shown in FIG. 16).

[0035] In Example 9 above described embodiments (in particular Examples 1 to 4 and 6), the valve body 11 made of resin, especially by the formed shape to Rukoto a resin containing a solid lubricant such as molybdenum disulfide , The inertia force of the valve body 11 due to the vibration and the valve body 11 are controlled by the passage area control unit 2
Sliding resistance when moving the inside of the valve opening 21 by elastically deforming 1a can be reduced. That is, the passage area control unit 2
The difference (tightening margin) between the inner diameter of 1a and the outer diameter of the cylindrical portion 22 of the valve body 11 can be reduced, and the compressive stress applied to the passage area control portion 21a is reduced. Further, since sliding friction with the valve element 11 is reduced, it is possible to suppress changes in shape and dimension even during long-term use, maintain stable flow rate adjustment accuracy, and enhance reliability as an auxiliary air control valve.

As a result, the conical portion 12 of the valve body (particularly two or more stages)
(If it is formed on the upper side ), the manufacturing becomes easy, and the thickness and width of the seal member on the valve seat side can be reduced. This can be achieved even if the valve seat 9 is made of resin containing a solid lubricant such as molybdenum disulfide (especially in Example 4). In addition, when the valve seat 9 and the integral part 28 are made of resin in Examples 1 to 3 and 6 , it is possible to improve the adhesiveness when fixing each seal member and to facilitate the production of the groove or hole for preventing the falling off. Planned.

Embodiment 10 In the above-mentioned embodiments (especially Embodiments 1 to 4 and 6), the sealing member is formed of low-adhesive fluororubber, and the cylindrical portion 22 of the valve body 11 (in the embodiment 4, the valve opening By coating 21 ) with a resin having a low friction coefficient, the movement of the valve body 11 in the valve opening 21 can be made smooth, and the adhesion due to carbon deposits or oil passing through the air passage can be prevented. This can be done by applying a resin coating of low coefficient of friction sheet seal member.

[0038]

According to the invention described in any one of claims 1 , 5, and 16, the entire cylindrical portion is provided at a predetermined position after the passage area is minimized between the cylindrical portion and the valve opening of the valve body. Since the seal portion that is in close contact with the circumference is provided, it becomes easy to set the shape and dimension for controlling the passage area by the conical portion of the valve body and the valve opening.
Moreover, the air flow rate can be controlled and shut off reliably. According to the second aspect of the invention, the seal portion is provided in which the portion that faces the conical portion of the valve body and determines the passage area and the portion where the valve body moves and comes into close contact with the cylindrical portion are in the same location. Therefore, it is easier to set the dimensions for controlling the flow rate until the cylindrical part of the valve body comes into close contact with the seal part, and to control and shut off the air flow rate more reliably than when these parts are separated. You can do it. According to the invention described in claim 3, since the seal member having elasticity is provided in the cylindrical portion of the valve body, when the passage area is controlled between the valve body and the valve mouth, the shape inside the valve mouth is carefully designed. The trouble can be avoided, and the flow rate can be controlled and shut off reliably. Claim 4
According to the invention described in (1), since the urging means is arranged between the cap and the valve body by integrally forming the cap and the valve seat, the space for the urging means is small and the entire apparatus can be downsized.

According to the sixth aspect of the present invention, since the guide portion of the biasing means is provided on the inner diameter of the integral part, the position of the biasing means may move during use or fall off. It is prevented. According to the invention of claim 7, since the seal portion has a seal lip-like shape, the seal portion can be downsized and the air flow can be surely blocked. According to the invention as set forth in claim 8, since the seal portion is fixed to almost the entire valve opening, the fixability and the moldability of the seal portion are improved. According to the invention described in claim 9, since the resin coating having a low coefficient of friction is applied to the seal portion, it is possible to prevent a problem such as sticking between the valve body and the seal portion due to carbon deposits or oil. In the invention according to claim 10,
According to this, the valve seat is made of resin and
Than the inertial force of the body is reduced, it is possible to smoothly move the valve body. According to the invention described in claim 11, the valve
By making the seat made of resin, the stickiness of the seal part is improved,
It is possible to easily configure the groove or hole for preventing the falling.

According to the twelfth aspect of the invention, since the seal portion is integrally provided, the manufacturing process can be simplified. According to the thirteenth aspect of the present invention, since the inner diameter side of the cross section of the valve opening is formed into an acute angle, the sliding resistance with the valve body can be reduced, and the shape and dimension accuracy of the seal portion is improved. According to the invention described in claim 14, since the male thread of the cap is coated with the microencapsulated adhesive, the work is easy when the cap is attached to the valve housing, and the assembling strength and the sealing property can be secured. . According to the fifteenth aspect of the invention, since the cap and the valve seat are connected by the cylindrical portion and the plate-shaped portion, the connection strength can be increased, and the tightening torque when attaching the integrated component to the valve housing is reduced. It can be installed even if it grows. According to the invention of claim 17 or 18, the seal
The part is made of low-adhesive fluororubber, and the cylindrical part of the valve body and valve seat
Since the valve opening of is coated with a resin with a low coefficient of friction,
The movement of the valve body in the valve opening becomes smoother and the carbon deposit
It is possible to eliminate stickiness due to jitt or oil. Claim 1
According to the invention of 9 or 20, the valve body or the valve seat is made of a solid lubricant.
Since it is made of resin that contains, it is lightweight and prevents valve body from sticking.
Can be achieved at the same time.

[Brief description of drawings]

FIG. 1 is a diagram showing Embodiment 1 of the present invention, in which (a)-
FIG. 3C is a cross-sectional view of a main part showing each operating state.

FIG. 2 is a sectional view of an essential part showing a modified example of the first embodiment of the present invention.

FIG. 3 is a cross-sectional view of essential parts showing Embodiment 2 of the present invention.

FIG. 4 is a cross-sectional view of essential parts showing Embodiment 2 of the present invention.

FIG. 5 is a cross-sectional view of essential parts showing Embodiment 2 of the present invention.

FIG. 6 is a diagram showing Embodiment 3 of the present invention, in which (a)-
FIG. 3C is a cross-sectional view of a main part showing each operating state.

FIG. 7 is a main-portion cross-sectional view showing a modification of Example 3.

FIG. 8 is a main-portion cross-sectional view showing a modification of Example 3.

FIG. 9 is a cross-sectional view of essential parts showing Embodiment 4 of the present invention.

FIG. 10 is a main-portion cross-sectional view showing a modification of Example 4.

11A and 11B are views showing a fifth embodiment of the present invention, in which FIG. 11A is a sectional view and FIG. 11B is a perspective view of an integral part.

FIG. 12 shows an improvement of the integral part of FIG.

FIG. 13 is a partial sectional view showing Embodiment 6 of the present invention.

FIG. 14 is a perspective view of an integrated component showing Embodiment 7 of the present invention.

FIG. 15 is a cross-sectional view of essential parts showing Embodiment 8 of the present invention.

FIG. 16 is a sectional view showing a conventional auxiliary air control valve.

FIG. 17 is a cross-sectional view showing another example of the conventional auxiliary air control valve.

18 is a partially enlarged view of the auxiliary air control valve of FIG.

FIG. 19 is a partially enlarged sectional view showing still another example of the conventional auxiliary air control valve.

[Description of Reference Signs] 1 engine 2 intake passage 3 throttle valve 4a, 4b bypass passage 5 valve housing 6 air inlet 7 air outlet 9 valve seat 9A valve seat portion 11 valve body 12 cone portion 13 spring (biasing means) 14 actuator 15 Cooling water 21 Valve mouth 22 Cylindrical part 26, 26A, 26B, 26C, 26D, 26E Seal member (seal part) 27 Elastic seal member 28, 28A Integrated part 29 Cap part 30 Plate part 31 Guide part 32 Cylindrical part 33 Air Distribution hole

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[Procedure 3]

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[Figure 6]

Claims (15)

[Claims] 1. A valve housing having an air inlet and an air outlet connected to a bypass passage bypassing a throttle valve of an engine, and a valve seat formed in an internal air passage connecting the air inlet and the air outlet, and the valve. A valve element that is disposed opposite to the seat and controls the passage area, a biasing means that biases the valve element in the valve opening direction, and the biasing element that biases the valve element according to at least one operating parameter of the engine. An actuator for controlling movement against the means, the valve seat has a valve opening with a predetermined inner diameter, the valve body is movable in the valve opening, and a passage area is determined according to a position facing the valve opening. An auxiliary air control valve of an engine configured to have a conical portion for controlling a conical portion and a cylindrical portion formed on a large diameter side of the conical portion and capable of passing through the valve opening, wherein the valve seat has the valve As the body moves, the passage area is maximized between the cylinder and the valve opening. Auxiliary air control valve of the engine, characterized in that a sealing portion having a portion in close over substantially the entire circumference of the cylindrical portion at a predetermined position after. 2. A valve housing having an air inlet and an air outlet connected to a bypass passage bypassing a throttle valve of an engine, and a valve seat formed in an internal air passage connecting the air inlet and the air outlet, and the valve. A valve element that is disposed opposite to the seat and controls the passage area, a biasing means that biases the valve element in the valve opening direction, and the biasing element that biases the valve element according to at least one operating parameter of the engine. An actuator for controlling movement against the means, the valve seat has a valve opening with a predetermined inner diameter, the valve body is movable in the valve opening, and a passage area is determined according to a position facing the valve opening. An auxiliary air control valve of an engine configured to have a conical portion for controlling a conical portion and a cylindrical portion formed on the large diameter side of the conical portion and capable of passing through the valve opening, wherein the valve seat has a valve A part that determines the passage area facing the conical part of the body Auxiliary air control valve of the engine, wherein a seal portion and a portion for close contact with the cylindrical portion and the valve body moves is the same place is provided. 3. A valve housing having an air inlet and an air outlet connected to a bypass passage bypassing a throttle valve of an engine, and a valve seat formed in an internal air passage connecting the air inlet and the air outlet, and the valve. A valve element that is disposed opposite to the seat and controls the passage area, a biasing means that biases the valve element in the valve opening direction, and the biasing element that biases the valve element according to at least one operating parameter of the engine. An actuator for controlling movement against the means, the valve seat has a valve opening with a predetermined inner diameter, the valve body is movable in the valve opening, and a passage area is determined according to a position facing the valve opening. In an auxiliary air control valve of an engine configured to have a conical portion for controlling the conical portion and a cylindrical portion formed on the large diameter side of the conical portion and capable of passing through the valve opening, in the cylindrical portion of the valve body, A seal part having elasticity is provided, and this seal part Auxiliary air control valve of the outside diameter of inclusive cylindrical portion engine characterized by comprising been larger than the inner diameter of the valve port. 4. A valve housing having an air inlet and an air outlet connected to a bypass passage bypassing a throttle valve of an engine, and a valve seat formed in an internal air passage connecting the air inlet and the air outlet, and the valve. A valve element that is disposed opposite to the seat and controls the passage area, a biasing means that biases the valve element in the valve opening direction, and the biasing element that biases the valve element according to at least one operating parameter of the engine. An actuator for controlling movement against the means, the valve seat has a valve opening with a predetermined inner diameter, the valve body is movable in the valve opening, and a passage area is determined according to a position facing the valve opening. And a cylindrical portion formed on the large diameter side of the conical portion and capable of passing through the valve opening, and the valve housing is airtightly isolated from the outside. Engine with a cap In the above auxiliary air control valve, the valve seat and the cap are integrally configured, and the urging means is arranged between the inside of the cap and the tip of the valve body. valve. 5. The cylindrical portion of the auxiliary air control valve according to claim 4, wherein the valve body moves to a predetermined position after the passage area is minimized between the cylindrical portion and the valve opening. An auxiliary air control valve for an engine provided with a sealing portion that is in close contact with the entire circumference of the engine. 6. The auxiliary air control valve for an engine according to claim 4, wherein at least a part of an inner diameter of an integral part of the valve seat and the cap serves as a guide portion for preventing displacement of the biasing means. 7. The auxiliary air control valve for an engine according to claim 1, wherein the seal portion has a seal lip shape. 8. The seal portion is fixed to almost the entire valve opening,
The auxiliary air control for an engine according to any one of claims 1, 2 and 5, wherein a portion that comes into contact with the cylindrical portion of the valve body when the cylindrical portion of the valve body passes through the valve opening is provided in the seal portion. valve. 9. The engine auxiliary equipment according to claim 1, wherein the seal portion is made of rubber, and the seal portion or the valve body is coated with a resin having a low friction coefficient. Air control valve. 10. The valve body is made of resin, and
The auxiliary air control valve for an engine according to any one of 3 and 5. 11. The valve seat of claim 1, wherein the valve seat is made of resin.
The auxiliary air control valve for an engine according to any one of 3 and 5. 12. The auxiliary air control valve for an engine according to claim 1, wherein the seal portion is integrally fixed to a place where the seal portion is provided. 13. The auxiliary air control valve for an engine according to claim 1, wherein the valve port of the valve seat has an acute-angled shape on the inner diameter side of its cross section. 14. The cap according to claim 4, wherein a male thread is formed on the outer periphery of the cap, a female thread is formed on the valve housing so as to be screwed with the male thread, and the male thread is coated with a microencapsulated adhesive. Auxiliary air control valve for the engine. 15. The integral part of the valve seat and the cap is provided with a cylindrical portion for connecting the valve seat and the cap, and a plate-shaped portion radially connected from the cylindrical portion. The auxiliary air control valve for an engine according to claim 4, wherein an air circulation hole is formed in the shaped portion.