JP2003083073A - Variable intake device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a variable intake device in which a selector valve made of synthetic resin and connected with an actuator on one end side is turnably supported on an intake passage structural body made of synthetic resin by enabling change of a substantial intake passage length and a stopper abutting on a regulation face provided in the other end part of the selector valve to determine turn limit of the selector valve is provided protrudedly and integrally with the intake passage structural body to prevent the reduction of turn limit position precision of the selector valve and maintain control precision highly precisely for a long time. SOLUTION: A metallic regulation member 50 forming the regulation face 49 is fixed to the other end part of the selector valve 20.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable intake device, and more particularly, to a variable intake device in which a switching valve made of a synthetic resin to which an actuator is connected at one end has a substantial intake passage length. A stopper that is rotatably supported by a synthetic resin intake passage structure so as to be able to change the rotation valve of the switching valve and abuts on a regulating surface provided at the other end of the switching valve. The present invention relates to an improvement of a variable intake device integrally projecting from the intake passage structure. 2. Description of the Related Art Conventionally, such a variable intake device is already known, for example, from US Pat. No. 6,138,628, and an actuator is connected to one end of a synthetic resin rotary valve as a switching valve. A stopper provided integrally with a synthetic resin intake passage structure that rotatably supports the rotary valve abuts on a regulating surface formed integrally with the other end of the rotary valve, thereby rotating the rotary valve. The limit of movement is regulated. [0003] However, in the above-mentioned conventional device, both the stopper and the regulating surface that come into contact with each other are made of synthetic resin, and the rotation limit of the rotary valve is caused by friction caused by engine vibration. Position accuracy may be reduced. SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a variable intake device that prevents a decrease in the rotation limit position accuracy of a switching valve and maintains high-accuracy control for a long period of time. The purpose is to provide. [0005] In order to achieve the above object, the present invention provides a synthetic resin switching valve having an actuator connected to one end thereof, which changes a substantial intake passage length. A stopper which is rotatably supported by a synthetic resin intake passage structure and which abuts a regulating surface provided at the other end of the switching valve to determine a rotation limit of the switching valve is provided by the intake passage structure. In a variable intake device integrally projecting from a structure, a metal regulating member forming the regulating surface is fixed to the other end of the switching valve. According to this structure, the stopper is made of synthetic resin, whereas the restricting surface against which the stopper comes into contact is regulated by the metallic restricting member fixed to the switching valve. Therefore, even if friction occurs in accordance with the axial vibration of the switching valve between the restricting surface and the stopper that are in contact with each other, the rotation limit position accuracy of the switching valve is prevented from deteriorating, and control of the variable intake device is extended. High accuracy can be maintained over the period. An embodiment of the present invention will be described below based on an embodiment of the present invention shown in the accompanying drawings. 1 to 7 show a first embodiment of the present invention. FIG. 1 is an exploded perspective view of an intake passage structure and a rotary valve, and FIG. 2 is an intake passage structure in a high-speed operation state of an engine. Longitudinal section of body and rotary valve, FIG. 3
3 is a sectional view taken along the line 3-3 in FIG. 2, FIG. 4 is a longitudinal sectional view of the intake passage structure and the rotary valve in low and medium speed operation states of the engine, FIG. 5 is an enlarged view of a main part of FIG. 6-6 in FIG.
7 is a sectional view taken along line 7-7 of FIG. Referring first to FIGS. 1 and 2, an intake passage structure 11 of the variable intake device corresponds to a four-cylinder engine, and is formed by welding a plurality of, for example, three joining members made of synthetic resin to each other. The surge tank 13 forming the intake chamber 12 and the intake passages 14, 14... Connected to the intake chamber 12 are formed so as to form four mutually independent one ends commonly connected to the surge tank 13. The branch pipe sections 15, 15,... And each of the branch pipe sections 15, 15,.
Mounting flange 1 commonly connected to the other end of the engine
6 is provided. An air inlet 17 is provided at one end of the surge tank 13 along the arrangement direction of the branch pipes 15, 15,..., And an air cleaner is provided at the air inlet 17 via a throttle body (not shown). The air is connected to the intake chamber 12 in an amount corresponding to the throttle opening of the throttle body. Each branch pipe 15, one end of which is connected to the lower part of the surge tank section 13, is formed so as to be curved in a substantially C shape and is arranged in parallel in the horizontal direction. An engine mounting flange 16 commonly connected to the other ends of the 15, 15, ... is disposed above the surge tank portion 13. Referring also to FIG. 3, the intake passage structure 1
1 is provided with a bypass passage 18 having one end opened to the intake chamber 12 and the other end opened in the middle of the intake passages 14, 14. , 14... To the engine, the length of the intake passage 12
The length is set shorter than the length of the intake passage extending to the engine through 4, 14,. Each bypass passage 1 depends on the engine speed.
The actual intake passage length in the intake passage structure 11 is switched by switching between the communication and shutoff of the bypass passages 8. 20 is rotatably supported by the intake passage structure 11. The intake passage structure 11 includes a bypass passage 1
8 is provided with a support hole 21 having a circular cross section that crosses an intermediate portion of the rotary valve 20. The rotary valve 20 formed in a cylindrical shape having passage holes 22 individually corresponding to the bypass passages 18 is supported. It is rotatably inserted into the hole 21. At both ends in the axial direction of the rotary valve 20, valve shafts 23 and 24 are coaxially fixed.
3 and 24 are rotatably supported by the intake passage structure 11. A base end of an arm 26 is fixed to one end of the valve shaft 23, and a rod 28 of an actuator 27 is connected to a distal end of the arm 26. The actuator 27
Is a diaphragm type having an operation axis in a plane orthogonal to the axes of the valve shafts 23 and 24, and operates the rod 28 in the axial direction according to the engine speed. Thus, in the low and medium speed regions of the engine, the negative pressure of the intake chamber 12 is introduced into the actuator 27, and the actuator 27 accordingly moves the rod 28 rightward in FIG. , Each of the bypass passages 18 is rotated to the closing side. In the high-speed rotation region of the engine, the actuator 27 moves the rod 28 to the left in FIG. 3, whereby the rotary valve 20 is rotated to a position where each of the bypass passages 18 is opened as shown in FIGS. . An actuator case 29 provided in the actuator 27 includes a case member 30 made of a synthetic resin,
Synthetic resin cover 31 fastened to case member 30
Consisting of A case member 30 which is a part of the actuator case 29 is formed in a bowl shape so as to form the actuator case 29 in cooperation with the cover 31. The case member 30 includes a rod 28 and a valve shaft. 2
A cover portion 30a that covers the connecting portion 3 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 30a and the mounting plate 32
Oa and the mounting plate 32 are fastened together by, for example, three bolts 33 which are screwed into the intake passage structure 11 and fastened to the intake passage structure 11, and the cover portion 30a is For example, it is fastened to the mounting plate 32 by two bolts 34. The rotary position of the rotary valve 20 depends on the position of the actuator 2 connected to one end of the valve shaft 23.
7 is detected by a detector 35 disposed adjacently on the outer side in the direction along the axis of the valve shaft 23. The detector 35 covers a part of the valve shaft 23 and Part 30a
Attached to The detector 35 is attached to the cover 30a so as to cover one end of the valve shaft 23, and is attached to the valve shaft 23 so as to rotate integrally with the valve shaft 23. A detecting portion 37 such as a magnet to be detected and a detecting portion 38 such as a Hall IC or a magneto-electric conversion element fixedly arranged in a detector housing 36 to detect the detecting portion 37 in a non-contact manner.
The rotation position of the valve shaft 23, that is, the operating position of the rotary valve 20 can be detected without contacting the valve shaft 23. In FIG. 5, a disc portion 39 having a groove 40 on its outer periphery is integrally and coaxially provided at one end of a valve shaft 24 made of metal, and the disc portion 39 is connected to the other end of the rotary valve 20. The valve shaft 24 is coaxially fixed to the other end of the rotary valve 20 by being buried coaxially and integrally with the central portion. A cylindrical mount member 41 made of synthetic resin is fitted on the valve shaft 24. An engagement flange 41a provided integrally with the mount member 41 in an annular groove 42 provided in the valve shaft 24. Is engaged with the mounting member 41.
Is fixed to the valve shaft 24. The intake passage structure 11 is integrally provided with a bottomed cylindrical bearing housing 11a which coaxially surrounds the valve shaft 24 and the mount member 41, and has a bearing housing 11a on the outer periphery of the mount member 41. An O-ring 43 is mounted on the inner periphery of the O-ring. That is, the valve shaft 24 fixed to the other end of the rotary valve 20 is rotatably supported via the mount member 41 and the O-ring 43 on the bearing housing 11 a integrally provided in the intake passage structure 11. . Referring to FIGS. 6 and 7, a stopper 44 protruding toward the rotary valve 20 is integrally provided in the intake passage structure 11 at a portion facing the other end surface of the rotary valve 20. On the other hand, rotary valve 2
On the other end surface of 0, a recess 45 into which the tip of the stopper 44 is inserted is formed in an arc shape centered on the rotation axis of the rotary valve 20, that is, the axis of the valve shaft 24. On the other end of the rotary valve 20,
A partition wall 46 extending in the radial direction of the rotary valve 20;
A lightening recess 48 is provided in which 47 is interposed between the recess 45 and both ends in the circumferential direction of the recess 45. By the operation of the actuator 27 in the high-speed rotation region of the engine, the rotation limit when the rotary valve 20 is rotated to the position where each of the bypass passages 18 is opened as shown in FIGS. The regulating surface 49 against which the stopper 44 is brought into contact for regulation is provided by the rotary valve 2.
0 is provided at the other end of the
Is formed by a metal regulating member 50 fixed to the other end surface of the rotary valve 20 by caulking. The restricting member 50 has a substantially U-shaped restricting portion 50a which straddles the partition wall 46 at one end side in the circumferential direction of the concave portion 45. The restricting member 50 has a projection 51 integrally protruded from the lightening concave portion 48 of the rotary valve 20. Is inserted into the regulating member 50 and the tip of the projection 51 is heat-staken, whereby the regulating member 50 is fixed to the other end of the rotary valve 20. The restricting surface 49 is formed on the restricting portion 50a of the restricting member 50 as a flat surface so as to face the stopper 44, and minimizes the contact area between the stopper 44 and the restricting surface 49. The regulating surface 49 is formed so as to protrude from the other end surface of the rotary valve 20 in order to increase the contact surface pressure. Next, the operation of the first embodiment will be described.
The rotation limit of the rotary valve 20 toward the position where each of the bypass passages 18... Is opened is provided on the regulating surface 49 provided at the other end of the rotary valve 20 so as to protrude from the intake passage structure 11. It is regulated by the contact of the stopper 44. Thus, while the stopper 44 integral with the intake passage structure 11 is made of synthetic resin, the regulating surface 49 is formed by a metallic regulating member 50 fixed to the other end of the rotary valve 20. Is what is done. Therefore, even if friction occurs in accordance with the axial vibration of the rotary valve 20 due to the engine vibration between the restricting surface 49 and the stopper 44, which are in contact with each other, the rotation limit position accuracy of the rotary valve 20 is reduced. Thus, the control of the variable intake device can be maintained with high accuracy for a long period of time. FIGS. 8 and 9 show a second embodiment of the present invention, in which parts corresponding to those in the first embodiment are denoted by the same reference numerals. The intake passage structure 11 is provided with a rotary valve 2 at a portion opposed to the other end surface of the rotary valve 20 ′.
A stopper 44 protruding toward the 0 'side is provided integrally. On the other hand, a recess 45 into which the tip of the stopper 44 is inserted is formed in the other end surface of the rotary valve 20 ′ in an arc shape centered on the rotation axis of the rotary valve 20, that is, the axis of the valve shaft 24. The stopper 44 is brought into contact with the rotary valve 20 'to limit the rotation limit when the rotary valve 20' is rotated to a position where each of the bypass passages 18 (see the first embodiment) is opened in the high-speed rotation region of the engine. A restricting surface 52 and a restricting surface 53 for contacting the stopper 44 for restricting a rotation limit when the rotary valve 20 'rotates to a position to close the bypass passages 18 in the low and medium speed rotation regions of the engine. Are provided at the other end of the rotary valve 20 ′, and the respective regulating surfaces 52, 53 are formed of metal regulating members 54, 55 fixed to the other end of the rotary valve 20.
Formed by The regulating members 54 and 55 are arranged along the radial direction of the rotary valve 20 'so as to regulate both circumferential ends of the concave portion 45. The other end of the valve 20 'is coaxially and integrally embedded with a disc 39 which is integrally embedded. That is, the regulating members 54 and 55 are fixed to the other end of the rotary valve 20 'together with the valve shaft 24. The regulating surfaces 52 and 53 are
Is formed on a flat surface so as to face
In order to reduce the contact surface pressure by increasing the contact area between the stopper 44 and the regulation surfaces 52, 53 as much as possible,
53 is formed so as to protrude from the other end surface of the rotary valve 20 '. According to the second embodiment, similarly to the first embodiment, the axial vibration of the rotary valve 20 'accompanying the engine vibration is caused between the restricting surfaces 52, 53 and the stopper 44 which are in contact with each other. Therefore, even if the friction according to the above occurs, the rotation limit position accuracy of the rotary valve 20 'is prevented from lowering, and the control of the variable intake device can be maintained with high accuracy for a long period of time. Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the appended claims. It is possible. For example, in the above embodiment, the case where the switching valve is the rotary valve 20, 20 'has been described. However, the switching valve is a cylindrical valve housing having a passage hole and rotatably supported by the intake passage structure. The present invention can also be applied to a switching valve in which a valve body that opens and closes the passage hole is supported so as to be able to open and close. As described above, according to the present invention, even if friction occurs between the regulating surface and the stopper, which are in contact with each other, in accordance with the axial vibration of the switching valve, the rotation limit of the switching valve is limited. Position accuracy can be maintained for a long time, and control of the variable intake device can be maintained with high accuracy for a long time.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of an intake passage structure and a rotary valve according to a first embodiment. FIG. 2 is a longitudinal sectional view of an intake passage structure and a rotary valve in a high-speed operation state of an engine. FIG. 3 is a sectional view taken along line 3-3 of FIG. 2; FIG. 4 is a longitudinal sectional view of an intake passage structure and a rotary valve in a low and medium speed operation state of the engine. FIG. 5 is an enlarged view of a main part of FIG. 3; FIG. 6 is a sectional view taken along line 6-6 in FIG. 5; FIG. 7 is a sectional view taken along line 7-7 of FIG. 6; FIG. 8 is a cross-sectional view corresponding to FIG. 6 of the second embodiment. FIG. 9 is a sectional view taken along line 9-9 of FIG. 8; [Description of Signs] 11 ... intake passage structures 20, 20 '... rotary valve 27 as a switching valve ... actuator 44 ... stoppers 49, 52, 53 ... regulating surfaces 50, 54, 55 ・ ・ ・ Regulation member

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Kenji Takahashi             197-1 Kakuta-ji Ryu, Kakuda City, Miyagi Prefecture             Keihin Kakuda Development Center (72) Inventor Kenji Kudo             197-1 Kakuta-ji Ryu, Kakuda City, Miyagi Prefecture             Keihin Kakuda Development Center F-term (reference) 3G031 AA15 AA28 AB05 AC01 BA07                       BA14 BB04 DA12 DA28 DA34                       DA37 EA02 EA03 FA00 FA03                       GA05 GA13 HA01 HA04 HA10                       HA12

Claims (1)

Claims: 1. A synthetic resin switching valve (20, 20 ') to which an actuator (27) is connected at one end side is capable of changing a substantial intake passage length. The switching valve is rotatably supported by a resin-made intake passage structure (11) and abuts on a regulating surface (49, 52, 53) provided at the other end of the switching valve (20, 20 '). (20,2
In a variable intake device in which a stopper (44) for defining a rotation limit of 0 ′) is integrally provided with the intake passage structure (11), a metal member forming the regulating surface (49, 52, 53) is provided. The variable intake device characterized in that the regulating member (50, 54, 55) is fixed to the other end of the switching valve (20, 20 ').