JPH0653765U - Auxiliary air amount control device - Google Patents

Abstract

(57) [Summary] [Object] To provide an auxiliary air amount control device capable of preventing sticking without causing leakage. [Structure] A bypass passage 5 that bypasses the throttle valve 4 branches in parallel and then joins. The valve seats 10a and 10b and the solenoid 2 are respectively provided in the branch passages 5a and 5a.
A pair of valve bodies 12 that are integrally driven by one
a, 12b and first and second valve devices 6a, 6
b is arranged. First and second valve devices 6a, 6
b has different effective pressure receiving areas (diameters of the valve seat 10 and the valve body 12) so that it is closed when the suction negative pressure of the engine 2 acts.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an auxiliary air amount control device provided in an intake system of an engine for stabilizing idling rotation of the engine.

[0002]

[Prior art]

 Conventionally, as such an auxiliary air amount control device, for example, one described in Japanese Utility Model Laid-Open No. 3-37276 is known.

As shown in FIG. 3, this structure is constructed such that a bypass passage A bypassing a throttle valve is branched in parallel and then merged into the branched passages A ₁ and A ₂ to form valve seats B ₁ and B, respectively. ₂ and a pair of valve bodies C ₁ and C ₂ which are integrally driven by a solenoid. Then, the solenoid is excited by duty control according to the operating state of the engine to open / close the valve device and control the auxiliary air flow rate.

[0004]

[Problems to be solved by the device]

 However, in such a conventional example, the valve seat B₁ , B₂ Inner diameter d ₁ , D₂ And corresponding valve body C₁ , C₂ Outer diameter D₁ , D₂ Have the same dimensions, and to prevent sliding sticks, the valve seat B₁ , B₂ And valve body C₁ , C₂ Since it is configured to have a predetermined amount of clearance, some leakage was unavoidable even in an operating state in which auxiliary air was not desired to flow that much. As a result, there was a problem that it was difficult to meet the demand for reducing fuel consumption by reducing the idling speed.

In order to solve the above problems, if the clearance between the valve body and the valve seat is made very small, or if the valve body is seated, foreign matter may enter the clearance portion or the stick may stick when the engine is stopped. This may cause malfunction of the valve device.

An object of the present invention is to provide an auxiliary air amount control device that solves the above conventional problems and can prevent sticking without causing leakage.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a pair of bypass passages for bypassing a throttle valve, which are branched in parallel and then merged into each other, and the pair of branched passages are integrally driven by a valve seat and a solenoid. In the auxiliary air amount control device in which the valve device including the valve body is arranged, the effective pressure receiving area of the valve device is different so that the valve device is closed when negative suction pressure of the engine acts.

[0008]

[Action]

 According to the present invention, when the engine rotates and its suction negative pressure acts, the valve device is closed due to the different effective pressure receiving areas of the valve device, so that air is not leaked when unnecessary and the idling speed is reduced. You can Further, when the engine is stopped and the suction negative pressure stops working, the valve device opens, that is, the valve body separates from the valve seat, so that sticking is prevented.

[0009]

【Example】

 Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

In the drawings, an auxiliary air amount control device 1 according to the present invention is provided in the middle of a bypass passage 5 that bypasses throttle valves 4 and 4 provided in an intake passage 3 of an engine 2, It has a valve casing 7 for accommodating the second valve devices 6a and 6b and a solenoid casing 8. The bypass passage 5 is branched in parallel in the middle (branch passages 5a, 5a) and then merged (merged passage 5b), and the two auxiliary intake inlet portions 9a, 9a and the outlet portion 9b of the valve casing 7 are provided respectively. Connected with.

The valve casing 7 is provided with two annular valve seats 10a and 10b spaced apart from each other by a predetermined distance, and an air introduction chamber 11 is defined between the two.

Reference numerals 12 a and 12 b denote valve bodies that open and close the air introducing chamber 11 corresponding to the valve seats 10 a and 10 b, respectively, and are integrally formed with the rod 13. One end of the rod 13 is slidably held by the guide cylinder 15 of the valve casing 7 via the guide portion 14, and the other end is slidably held by the sliding hole 16a of the adjusting end wall 16. . The rod 13 is biased in the closing direction by a spring 17 mounted on the adjusting end wall 16 side.

As shown in detail in FIG. 2, the valve bodies 12a and 12b and the valve seats 10a and 10b are set so that their outer diameters and inner diameters differ by a predetermined amount. That is, the valve body 12a, 12b together and a frusto-conical portion 12a _1, 12b ₁ and the flange portion 12a _2, 12b _2, the frustoconical portion 12 a _1, 12b ₁ are the same diameter whereas, the diameter D _1, D ₂ of the flange portion 12a _2, 12b ₂ are set to D _1> D _2. On the other hand, the inner diameters d ₁ and d ₂ of the valve seats 10a and 10b are set to d ₁ > d ₂ . Thus, when the suction negative pressure of the engine 2 acts on the air introduction chamber 11, the effective pressure reception of the first valve device 6a of the first and second valve devices 6a and 6b set as described above is performed. The area is large, and the valve bodies 12a and 12b are biased to the left in the figure.

That is, the flange portions 12a ₂ and 12b _{2 of} the valve bodies 12a and 12b come into contact with the valve seats 10a and 10b to completely close the first and second valve devices 6a and 6b.

Further, the solenoid casing 8 includes a solenoid 21 inside and a plunger 22 housed in the solenoid 21 slidably in the axial direction. A drive rod 23, which abuts against the end of the rod 13, is fixed to the tip of the plunger 22, and the flange-like portion 12a of the valve bodies 12a and 12b described above is fixed to the rear end.₂ , 12b ₂ At a position where a slight gap is formed between the valve seat 10a and the valve seat 10b when the engine 2 is at rest, a spring 24 set so as to balance with the spring force of the spring 17 is mounted.

Reference numeral 25 is a water jacket for cooling the solenoid 21, 26 is a control unit, and 27 is an idle adjusting screw.

In this embodiment having the above-described configuration, the solenoid 21 performs the excitation / non-excitation operation based on the duty control signal from the control unit 26 according to the operating state of the engine, and the plunger 22, the drive rod 23, and the rod are driven. Opening / closing control of the valve devices 6a and 6b is performed by moving 13 in the axial direction.

At this time, as long as the engine 2 is rotated and the suction negative pressure acts on the air introduction chamber 11, due to the difference in effective pressure receiving area between the first valve device 6a and the second valve device 6b as described above. Since the valve bodies 12a and 12b are urged in the closing direction (left side) of the valve devices 6a and 6b, the valve bodies 12a and 12b are completely closed during the closing operation, and leakage is prevented. Thus, it becomes possible to control the idling speed of the engine.

When the valve bodies 12 a and 12 b move to the right, the valve lift state is established and the amount of auxiliary air flowing through the bypass passage 5 increases.

Further, when the engine 2 is stopped, the urging force due to the suction negative pressure disappears, so that the flange portions 12a ₁ and 12b _{1 of the} valve bodies 12a and 12b are set by the above-mentioned load settings of the spring 17 and the spring 24. Is separated from the valve seats 10a and 10b, and a slight gap is formed. Thus, the sticking of the first and second valve devices 6a and 6b when the engine 2 is at rest is prevented.

[0021]

[Effect of device]

 As is apparent from the above description, according to the present invention, it is possible to prevent the valve device from sticking when the engine is at rest, and to prevent leakage of the auxiliary air amount, so that the idling speed can be reduced accordingly. The fuel consumption rate can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

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

FIG. 3 is a cross-sectional view showing a conventional example.

[Explanation of symbols]

 4 Throttle valve 5 Bypass passage 5a Branch passage 5b Confluence passage 6a First valve device 6b Second valve device 10a, 10b Valve seat 12a, 12b Valve body

Claims (1)

[Scope of utility model registration request] 1. A valve device comprising a bypass passage bypassing a throttle valve, which is branched in parallel and then merged, and a pair of valve bodies each integrally driven by a valve seat and a solenoid are provided in the branched passages. In the arranged auxiliary air amount control device, the effective air pressure receiving area of the valve device is made different so that the valve device is closed when an intake negative pressure of the engine acts.