JP4346101B2 - Variable intake system - Google Patents

Description

The present invention includes an intake passage structure that includes a valve shaft that is rotatably supported by the intake passage structure, and a butterfly valve body that is fixed to the valve shaft. A detector for detecting the operating position of the valve body is attached corresponding to one end portion of the valve shaft protruding from the intake passage structure, and an actuator having an operating member connected to the one end portion of the valve shaft, an improvement of the variable intake apparatus in one end of the valve shaft Ru is disposed adjacent a detector.

Such a variable intake device is already known, for example, from Patent Document 1.
JP 2000-8865 A

An object of the present invention is to provide a variable intake device that can improve the accuracy of detecting the operating position of a butterfly valve body .

In order to achieve the above object, the invention of claim 1 is directed to an intake passage structure, a valve shaft that is rotatably supported by the intake passage structure, and a butterfly valve body fixed to the valve shaft. A detector for detecting the operating position of the valve body is attached to the intake passage structure corresponding to one end portion of the valve shaft protruding from the intake passage structure, and the one end portion of the valve shaft and the case member actuator having an operating member connected is a variable intake device that will be located adjacent to the detector at one end of the valve shaft, which is part of the actuator case of the actuator, the detector housing And a cover portion that covers the one end portion of the valve shaft and the connecting portion between the actuating members from the opposite side of the intake passage structure, and the cover portion is detachable from the intake passage structure. Fastened and detector is valve stem Characterized in that it comprises a detected portion attached to the valve shaft so as to rotate integrally, and a detection unit which is fixedly disposed in the detector housing so as to detect the detected portion without contact.

According to the present invention, the non-contact type detector for detecting the operating position of the butterfly valve body is attached to the intake passage structure corresponding to one end of the valve shaft, so that the friction on the detector side can be kept small. Therefore, it is possible to reduce the size of the actuator while reducing the difference in the rotational position of the valve body according to the distance from the actuator, and to apply an offset load to the detector. Therefore, the detection accuracy can be improved while enhancing the durability of the detector. A detector housing integrated with a cover portion detachably fastened to the intake passage structure; a detected portion attached to the valve shaft to rotate integrally with the valve shaft; and the detected portion And a detector that is fixedly arranged in the detector housing so that the detector can be detected in a non-contact manner. The detector housing can be easily attached to the intake passage structure so as to maintain the non-contact with the detector, and the assembly work of the detector can be facilitated. In addition, the actuator connected to one end of the valve shaft and the detector are arranged adjacent to each other, so that the valve body operating position is detected at the position where the difference in the rotational position in the direction along the axis of the valve shaft is the smallest. The detection accuracy can be further enhanced by detecting with the above. Further, since the cover portion that is detachably fastened to the intake passage structure and covers the connecting portion of the actuator operating member and the valve shaft is integral with the case member that is a part of the actuator case, it is fixed to the intake passage structure. Compared to the case where the actuator case is supported by the stay, the number of parts can be reduced and the actuator can be fixed and supported on the intake passage structure side.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on a reference example shown in the accompanying drawings and an embodiment of the present invention.

1 to 3 show a reference example, FIG. 1 is a side view of a variable intake device, FIG. 2 is a longitudinal sectional view of the variable intake device viewed from the same direction as FIG. 1, and FIG. FIG.

  First, in FIG. 1 and FIG. 2, an intake passage structure 11 of this variable intake device corresponds to a four-cylinder engine, and is constructed by welding a plurality of, for example, three joining members made of synthetic resin to each other. The surge tank part 13 forming the collecting chamber 12 and the main intake passages 14 connected to the intake collecting chamber 12 are formed so as to form four mutually independent ones commonly connected to the surge tank part 13. The branch pipes 15, 15... And an engine mounting flange 16 that is connected in common to the other ends of the branch pipe portions 15, 15.

  An air inlet 17 is provided at one end of the surge tank 13 along the parallel direction of the branch pipe portions 15, 15..., And an air cleaner is connected to the air inlet 17 via a throttle body (not shown). An amount of air corresponding to the throttle opening in the throttle body is introduced into the intake manifold 12.

  Each branch pipe part 15, 15... Of which one end is connected to the lower part of the surge tank part 13 is formed so as to bend in a substantially C shape and is arranged in parallel in the horizontal direction, and each branch pipe part 15, 15. An engine mounting flange 16 provided in common with the other end of the... Is disposed above the surge tank portion 13.

  Referring also to FIG. 3, the intake passage structure 11 is provided with auxiliary intake passages 18 that open at one end to the intake air collecting chamber 12 and open the other end in the middle of the main intake passages 14, 14. The length of the intake passage from the intake manifold 12 to the engine through the auxiliary intake passages 18 and the main intake passages 14, 14... From the intake manifold 12 to the engine through the main intake passages 14, 14. It is set shorter than the length of the intake passage leading up to.

  The intake passage length in the intake passage structure 11 is switched by switching the communication / blocking of each auxiliary intake passage 18 according to the engine speed, and the switching valve that switches the communication / blocking of each auxiliary intake passage 18. 20 is rotatably supported by the intake passage structure 11.

  The switching valve 20 has a passage housing 22 corresponding to each of the auxiliary intake passages 18... And a valve housing 23 formed in a columnar shape, and is turned to the valve housing 23 between the passage holes 22. A valve shaft 24 that coaxially penetrates the valve housing 23 so as to be movably supported, and a butterfly valve body 25 that is fixed to the valve shaft 24 so as to be able to close the passage holes 22. With.

  The valve shaft 24 and the valve bodies 25 may be integrally formed of a synthetic resin. However, in order to increase rigidity and increase assembly accuracy, the valve shaft 24 and the valve bodies 25 are made of metal. Better to do.

  The intake passage structure 11 is provided with a support hole 21 having a circular cross section that crosses the intermediate portion of the auxiliary intake passages 18. The valve housing 23 of the switching valve 20 is fitted and fixed to the support hole 21. Is done. That is, the valve shaft 24 is rotatably supported by the intake passage structure 11 via the valve housing 23.

A base end of an arm 26 is fixed to one end portion of the valve shaft 24 protruding from the intake passage structure 11 , and an operation member 28 of an actuator 27 is connected to a distal end portion of the arm 26. The actuator 27 is a diaphragm type having an operating axis in a plane orthogonal to the axis of the valve shaft 24, and operates the operating member 28 in the axial direction according to the engine speed. Thus, in the low and medium speed rotation regions of the engine, the negative pressure in the intake manifold 12 is introduced into the actuator 27. In response, the actuator 27 moves the actuating member 28 to the right in FIG. It rotates to the side which closes sub-intake passage 18 .... Further, in the high-speed rotation region of the engine, the actuator 27 causes the operation member 28 to move leftward in FIG. 3, whereby the intake valve 20 is rotated to a position where the auxiliary intake passages 18 are opened.

  The actuator case 29 provided in the actuator 27 includes a case member 30 made of synthetic resin and a cover 31 made of synthetic resin fastened to the case member 30. The case member 30 which is a part of the actuator case 29 is configured in a bowl shape to cooperate with the cover 31 to form the actuator case 29. The case member 30 includes the actuating member 28 and the valve. A cover portion 30a that covers the connecting portion of the shaft 24 and is fastened to the intake passage structure 11 side is integrally provided.

  The cover portion 30a is fastened to the intake passage structure 11 via a synthetic resin mounting plate 32 sandwiched between the cover portion 30a and the intake passage structure 11. Thus, the cover portion 30a and the mounting plate 32 are fastened together by, for example, three bolts 33A, 33B, and 33C that are inserted into the cover portion 30a and the mounting plate 32 and screwed into the intake passage structure 11. Thus, the cover portion 30a is fastened to the mounting plate 32 by two bolts 33D and 33E, for example.

  That is, the cover portion 30a is fastened to the intake passage structure 11 side by, for example, five bolts 33A to 33E. Of the bolts 33A to 33E, the pair of bolts 33A and 33E includes the valve shaft 24 and the actuator. 27, the operation member 28 is interposed between the two.

  By the way, the operating position of the switching valve 20 is detected by a detector 34 arranged adjacent to the actuator 27 connected to one end side of the valve shaft 24 on the outer side in the direction along the axis of the valve shaft 24. The detector 34 is attached to the cover portion 30 a so as to cover a part of the valve shaft 24.

  Thus, the detector 34 covers the one end of the valve shaft 24 so that the detector housing 35 is attached to the cover portion 30 a with a pair of screw members 38, 38, and the valve 34 to rotate integrally with the valve shaft 24. A detection unit 36 such as a magnet attached to the shaft 24 and a detection unit 37 such as a Hall IC or a magnetoelectric conversion element fixedly disposed in the detector housing 35 so as to detect the detection unit 36 in a non-contact manner. Thus, the rotational position of the valve shaft 24, that is, the operating position of the switching valve 20 can be detected without contacting the valve shaft 24.

  When the detected portion 36 is attached to the valve shaft 24, the detected portion 36 may be directly fixed to the valve shaft 24, and the shaft having the detected portion 36 is coaxially connected to the valve shaft 24. It suffices that the valve shaft 24 and the detected portion 36 rotate integrally.

Next, the operation of this reference example will be described. The switching valve 20 that is rotatably supported by the intake passage structure 11 so as to switch the intake passage length according to the engine speed is provided via the valve housing 23. The butterfly type is provided with a valve shaft 24 rotatably supported by the passage structure 11 and butterfly type valve bodies 25 fixed to the valve shaft 24. Accordingly, it is possible to suppress bending deformation and torsional deformation in the entire axial direction of the switching valve 20 and to reduce friction during rotation.

  In addition, since the non-contact detector 34 for detecting the operating position of the switching valve 20 is attached to the intake passage structure 11 corresponding to one end of the valve shaft 24, the friction on the detector 34 side can be kept small. Is possible. Accordingly, it is possible to reduce the size of the actuator 27 while making it possible to reduce the difference in the rotational position of the switching valve 20 according to the distance from the actuator 27, and to apply an offset load to the detector 34. Therefore, the detection accuracy can be improved while increasing the durability of the detector 34.

  A detector 34 is attached to a cover 30 a fixed to the intake passage structure 11 and covers a part of the valve shaft 24, and the valve shaft 24 to rotate integrally with the valve shaft 24. And a detection unit 37 fixedly disposed in the detector housing 35 so as to detect the detection unit 36 in a non-contact manner. The detection unit 36 of the detector 34 is provided with a valve. The detector housing 35 of the detector 34 can be easily attached to the intake passage structure so as to maintain the non-contact with the valve shaft 24 while simplifying the configuration of the detector 34 by being arranged on the shaft 24 side. Thus, the assembly work of the detector 34 can be facilitated.

  Further, the actuator 27 connected to one end side of the valve shaft 24 and the detector 34 are arranged adjacent to each other, so that the switching valve 20 is at a position where the difference in the rotational position in the direction along the axis of the switching valve 20 is the smallest. Thus, the detection accuracy can be further improved by detecting the operation position by the detector 34. Further, since the detector 34 is disposed outside the actuator 27 in the direction along the axis of the valve shaft 24, the structure of the detector 34 is simplified by covering one end of the valve shaft 24 with the detector housing 35. And the actuator 27 is arranged between the intake passage structure 11 and the detector 34, and the length of the actuator 27 from the connecting portion to the valve shaft 24 to the detector 34, and the connecting portion. To the other end of the valve shaft 24, the detection accuracy can be further improved, and the deformation and torsional deformation of the switching valve 20 in the entire axial direction can be further reduced.

  Further, a cover portion 30a that covers the connecting portion between the actuating member 28 of the actuator 27 and the valve shaft 24 is integrally provided on the case member 30 that is a part of the actuator case 29, and the cover portion 30a is provided on the intake passage structure 11 side. Since it is fastened, the number of parts is reduced and the actuator 27 is fixed and supported on the intake passage structure 11 side as compared with the case where the actuator case 29 is supported by the stay fixed to the intake passage structure 11. Can do.

  In addition, among a plurality of, for example, five bolts 33A to 33E that fasten the cover portion 30a to the intake passage structure 11 side, a pair of bolts 33A and 33E is disposed at a position sandwiching the operating member 28 between the valve shaft 24 and the actuator 27. ing. Therefore, even if the actuator 27 having a relatively large weight is disposed so as to protrude from the cover portion 30a attached to the intake passage structure 11, the vibration due to the swing of the actuator 27 is suppressed from acting on the cover portion 30a as much as possible. Therefore, it is possible to prevent the vibration caused by the swing of the actuator 27 from adversely affecting the detection accuracy of the detector 34.

  Further, the cover portion 30a is fastened to the intake passage structure 11 via an attachment plate 32 sandwiched between the cover portion 30a and the intake passage structure 11, and the detector housing 35 of the detector 34 is attached to the cover portion 30a. Therefore, the actuator case 29 having the cover portion 30a, the detector 34, and the mounting plate 32 are assembled in advance as a unit, and the unit can be attached to the intake passage structure 11 to facilitate the assembling work. it can. At this time, if the valve housing 23 of the switching valve 20 is assembled in advance to the unit, the assembling work can be further facilitated.

Incidentally and in the reference example, but has been a configuration in which the detector housing 35 of the separate cover portion 30a is attached, in the embodiment of the present invention, the cover portion 30a and the detector housing 35 is Ru are formed integrally.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. It is.

It is a side view of a variable intake device. It is a longitudinal cross-sectional view of the variable intake device seen from the same direction as FIG. FIG. 3 is a sectional view taken along line 3-3 in FIG. 2.

Explanation of symbols

11 ... Intake passage structure 12 ... Intake collecting chamber 24 ... Valve shaft
25 ... Valve 27 ... Actuator
29 ... Actuator case
30 ... Case member
30a..Cover part 34 ... Detector
35 ... Detector housing
36: Detected part
37... Detection unit

Claims (1)

A valve shaft (24) rotatably supported on the intake passage structure (11) and a butterfly valve body (25) fixed to the valve shaft (24) on the intake passage structure (11 ) In the intake passage structure (11), a detector (34) for detecting the operating position of the valve body (25) has one end protruding from the intake passage structure (11) of the valve shaft (24). An actuator (27) having an actuating member (28) attached to the valve shaft (24) and connected to the one end of the valve shaft (24) is connected to the detector (24) on one end side of the valve shaft (24). A variable intake device arranged adjacent to the case member (30) which is a part of the actuator case (29) of the actuator (27), the detector housing (35), and the valve shaft (24). One end and the connecting portion of the actuating member (28) are connected to the intake passage structure ( 1) cover portion covering from the opposite side and (30a) are formed integrally with each other and, the cover portion (30) is detachably fastened to the intake passage structure (11),
The detector (34) detects the detected part (36) attached to the valve shaft (24) so as to rotate integrally with the valve shaft (24), and detects the detected part (36) in a non-contact manner. characterized in that it comprises detector housing (35) detecting unit which is fixedly disposed in the (37), a variable intake device.

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