JP2004197650A - Intake device for internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an intake device, reducing the number of parts and the man-hours for its installation and reducing the cost. <P>SOLUTION: The intake device 1 for an internal combustion engine comprises a housing 2, a plurality of intake passages 3 formed on the housing 2, intake control valves 4 for opening and closing the intake passages 3, a shaft 6 fixed to the intake control valves 4 and rotatably supported in a plurality of bearing holes 5 provided in the intake passages 3, and an actuator 7 for rotating the shaft 6. The shaft 6 is composed of a plurality of divided shafts 61, and adjacent divided shafts 61 are linked each other by a linking means 65 composed of a groove 61a, formed at one end of the shaft, having parallel faces 61c symmetric with respect to the axis of the divided shaft 61, and of a projection 61b, formed at the other end of the shaft, having arc surfaces 61d to be inserted into the groove 61a so that the arc surfaces may contact the inside of the parallel surfaces 61. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an intake device for an internal combustion engine, and more particularly, to a connection structure in which a shaft connecting an intake control valve and an actuator is constituted by a plurality of divided shafts, and the divided shafts are connected.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, an intake device for an engine includes a housing, a plurality of intake passages formed in the housing, an intake control valve disposed in each intake passage for opening and closing the intake passage, and an intake control valve fixed to the housing. A shaft rotatably supported by the plurality of bearing holes, and an actuator for rotating the shaft.
[0003]
The shaft is constituted by one shaft, and connects the plurality of intake control valves and the actuator. In such a conventional engine intake device, the shaft is provided so as to penetrate through the plurality of intake passages, so that a large number of bearing holes for supporting the shaft are required. On the other hand, it is very difficult to form all these bearing holes such that their axes are aligned on the same straight line.
[0004]
On the other hand, there is an intake system for an engine in which a shaft is constituted by a plurality of divided shafts connected on substantially the same straight line, and between the divided shafts, there is provided a core deviation absorbing means for absorbing a deviation between the axes of the two. (For example, see Patent Document 1).
[0005]
[Patent Document 1]
JP 2000-38932 A
[Problems to be solved by the invention]
However, in the intake device of this engine, the misalignment absorbing means is constituted by the joint interposed between the divided shafts and the connecting pipe connecting the joint and the divided shaft, so that the number of parts and the number of assembly steps are reduced. , The cost of parts and the cost of assembly increase, and the cost increases. In addition, the split shaft and the intake control valve are fixed with screw screws, which increases parts costs and assembly costs, and increases costs.
[0007]
Therefore, it is a technical object of the present invention to provide an intake device that reduces the number of parts and the number of assembling steps and reduces the cost of the intake device.
[0008]
[Means for solving the problem]
A first technical measure taken to solve the above-mentioned problem is that a housing, a plurality of intake passages formed in the housing, an intake control valve for opening and closing the intake passage, and the intake control valve A shaft rotatably supported by a plurality of bearing holes provided in the intake passage, and an actuator for rotating the shaft, an intake device for an internal combustion engine, wherein the shaft comprises: A plurality of divided shafts, the adjacent divided shafts are formed at one end thereof and have grooves which are symmetrical with respect to the axis of the divided shaft and have surfaces parallel to each other, and at the other end thereof, And a projection having an arc-shaped surface that is formed and is inscribed in the groove so as to be inscribed in the parallel surface.
[0009]
According to the above-described means, the shaft is composed of a plurality of divided shafts, and the divided shafts adjacent to each other are formed at one end thereof and have grooves symmetrical with respect to the axis of the divided shaft and parallel to each other. And a projection formed at the other end of the other end and having an arcuate surface housed in the groove so as to be inscribed in the parallel surface, and connected by a connecting means comprising a plurality of bearing holes. If there is a misalignment, the connecting means can rotate while absorbing the misalignment of the axes of the divided shafts, and the axes of all the divided shafts are accurately aligned on the same straight line. Even in the case where there is no shaft, the entire shaft formed by connecting the divided shafts can be smoothly rotated. Further, the rotation angles of the plurality of divided shafts constituting the shaft can be made substantially the same. Further, by providing the connecting means on the split shaft, the number of parts and the number of assembling steps can be reduced, and the cost of the intake device can be reduced.
[0010]
A second technical measure taken to solve the above problem is that a length of the projection in a direction perpendicular to the axis of the divided shaft is perpendicular to the axis of the groove of the divided shaft. Is set to be smaller than the length of.
[0011]
According to the above-described means, the divided shafts adjacent to each other can be bent in the length direction of the protrusion or the groove.
[0012]
A third technical measure taken to solve the above problem is that a gap is provided between the bottom of the groove and the tip of the projection.
[0013]
According to the above-described means, it is possible to absorb variations in the position of the divided shafts adjacent to each other in the axial direction.
[0014]
A fourth technical measure taken to solve the above problem is that the divided shaft supported by the adjacent bearing holes and the intake control valve are integrally formed.
[0015]
According to the above-described means, since the shaft and the intake control valve are integrally formed, the number of parts and the number of assembly steps can be reduced, and the cost of the intake device can be reduced.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
One embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a diagram showing a schematic configuration of an embodiment in which an intake device 1 according to the present invention is applied to an in-line four-cylinder engine. FIG. 2 is a front view of the cylinder head joining surface of the flange 8 of FIG. FIG. 3 is a cross-sectional view of (3)-(3) in FIG. FIG. 4 is a front view showing a state where the intake control valve 4 of FIG. 2 is opened. FIG. 5 is a sectional view taken along line 5-5 in FIG.
[0017]
An intake device 1 of an engine includes a housing 2, a plurality of intake passages 3 formed in the housing 2, an intake control valve 4 disposed in each intake passage 3 for opening and closing the intake passage 3, and an intake control valve 4. A shaft 6, which is integrally fixed and rotatably supported by a plurality of bearing holes 5 provided in each intake passage 3, an actuator 7 for rotating the shaft 6, and a rotation of the intake control valve 4. A control valve position sensor 8 for detecting an angle and a flange 9 are provided. The actuator 7 is a motor type actuator. The intake device 1 connects between the intake passages 3 and has a flange 9 integrally formed with the intake device 1 joined and fixed to a side surface of a cylinder head (not shown) of the engine. In the present embodiment, the intake control valve 4 and the shaft 6 are rotatably supported by a flange 9 connecting between the intake passages 3. The intake air is taken in the direction of the arrow in FIG.
[0018]
As shown in FIG. 3, a stepped groove 9 a having a stepped concave shape is formed in the flange 9 in the axial direction of the shaft 6, and the cross section of the shaft 6 in the axial direction is substantially T-shaped in the stepped groove 9 a. A plate 91 is inserted. A bearing hole 92 is formed at a joint between the plate 91 and the step groove 9a at the back of the step groove 9a. The shaft 6 is rotatably supported in the bearing hole 92.
[0019]
As shown in FIG. 5, the shaft 6 includes a plurality (four in the present embodiment) of divided shafts 61 supported by adjacent bearing holes 92. The displacement of the axis of the bearing hole 92 can be absorbed by the displacement of the axes of both of the divided shafts 61 inserted into the adjacent bearing holes 92.
[0020]
As shown in FIGS. 6 to 9, the split shaft 61 has a groove 61 a having a surface 61 c that is symmetric with respect to the axis of the split shaft 61 and parallel to the axis of the split shaft 61 in a direction perpendicular to the axis of the split shaft 61 at one end. At the other end, a protrusion 61b having an arc surface 61d inscribed in a plane parallel to the axis of the divided shaft 61 is formed. The protrusions 61b of the adjacent one of the divided shafts 61 are fitted into the grooves 61a of the adjacent one of the divided shafts 61 to form the connecting means 65. The arcuate surface 61d is provided in the circumferential direction so that the adjacent divided shafts 61 are inscribed within a range in which the adjacent divided shafts 61 bend in the vertical direction of the groove 61a. As a result, as shown in FIG. 10B, each groove 61a and the protrusion 61b of the adjacent divided shaft 61 can be inscribed, and one rotation angle of the adjacent divided shaft 61 and the other rotation angle can be used. The moving angles can be made substantially the same, and the rotation angles of the plurality of divided shafts 61 constituting the shaft 6 can be made substantially the same. That is, the rotation angle together with the rotational driving force transmitted from the actuator 7 to the divided shaft 61 can be reliably transmitted to all of the plurality of divided shafts 61. The length 61e of the protrusion 61b in the vertical direction with respect to the axis of the divided shaft 61 is set smaller than the length 61f of the groove 61a in the direction perpendicular to the axis of the divided shaft 61. As a result, as shown in FIG. 10C, the divided shafts 61 adjacent to each other can be bent in the directions 61e and 61f of the protrusions 61b or the grooves 61a. As shown in FIG. 8, ribs 61g may be provided circumferentially at both ends of the groove 61a in the width direction to improve the strength of the groove 61a in the width direction. In the state where the divided shaft 61 is disposed in the bearing hole 92, as shown in FIG. 10, the bottom 61h of the groove 61a of one of the adjacent divided shafts 61 and the other of the divided shaft 61 adjacent to each other are formed. A gap C is provided between the protrusion 61b and the tip 61j. As a result, as shown in FIG. 11A, it is possible to absorb variations in the axial position of the divided shafts 61 adjacent to each other.
[0021]
The split shaft 61 is formed integrally with the intake control valve 4. The divided shaft 61 and the intake control valve 4 are made of a resin material, and the divided shaft 61 and the intake control valve 4 are integrally formed by injection molding or the like. The intake control valve 4 is a butterfly valve, has a substantially elliptical shape, and has a notch 4a formed at the upper end. FIG. 2 shows the fully closed state of the intake control valve 4. FIG. 4 shows a fully opened state of the intake control valve 4.
[0022]
Next, the operation of the present embodiment will be described.
[0023]
When the rotation speed of the engine is low and the opening of the throttle valve (not shown) is small, the intake control valve 4 is rotated to the closed state shown in FIG. Improve exhaust gas characteristics. At this time, electric power is supplied to the actuator 7 by an electronic control device (not shown), and the rotation of the actuator 7 causes the connecting shaft 61 constituting the shaft 6 to rotate in the closing direction of the intake control valve 4 and the control valve position. The rotation angle of the intake control valve 4 is detected by the sensor 8 and fed back to the electronic control unit to adjust the rotation angle.
[0024]
In this case, if the bearing holes 92 adjacent to each other are displaced in the axial direction, the bottom 61h of the groove 61a of one of the divided shafts 61 and the protrusion 61b of the other divided shaft 61 shown in FIG. The gap C between the tip end 61j can absorb the axial displacement of the bearing holes 92 adjacent to each other. In the case where the adjacent bearing holes 92 are displaced in the radial direction, the inner surface between the parallel surface 61c of the groove 61a of one of the divided shafts 61 and the arc surface 61d of the projection 61b of the other divided shaft 61 is located. By setting the length 61e of the contact and the projection 61b in the direction perpendicular to the axis of the divided shaft 61 to be smaller than the length 61f of the groove 61a in the direction perpendicular to the axis of the divided shaft 61, the bearing holes 92a adjacent to each other are set. Radial deviation can be absorbed.
[0025]
Next, when the engine speed is high and the opening of the throttle valve is large, the intake control valve 4 is rotated to the open state shown in FIG. And improve the output. At this time, electric power is supplied to the actuator 7 by an electronic control device (not shown), and the rotation of the actuator 7 causes the connecting shaft 61 constituting the shaft 6 to rotate in the opening direction of the intake control valve 4 and the control valve position. The rotation angle of the intake control valve 4 is detected by the sensor 8 and fed back to the electronic control unit to adjust the rotation angle.
[0026]
In this case, if the bearing holes 92 adjacent to each other are displaced in the axial direction, the bottom 61h of the groove 61a of one of the divided shafts 61 and the protrusion 61b of the other divided shaft 61 shown in FIG. The gap C between the tip end 61j can absorb the axial displacement of the bearing holes 92 adjacent to each other. In the case where the adjacent bearing holes 92 are displaced in the radial direction, the inner surface between the parallel surface 61c of the groove 61a of one of the divided shafts 61 and the arc surface 61d of the projection 61b of the other divided shaft 61 is located. By setting the length 61e of the contact and the projection 61b in the direction perpendicular to the axis of the divided shaft 61 to be smaller than the length 61f of the groove 61a in the direction perpendicular to the axis of the divided shaft 61, the bearing holes 92a adjacent to each other are set. Radial deviation can be absorbed.
[0027]
【The invention's effect】
As described above, according to the first aspect of the invention, the shaft is composed of a plurality of divided shafts, and the divided shafts adjacent to each other are formed at one end of the divided shaft and are symmetric with respect to the axis of the divided shaft. It is to be connected by a connecting means consisting of a groove having a plane parallel to each other and a projection formed at the other end and having an arc surface housed in the groove so as to be inscribed in the parallel plane. Accordingly, when a plurality of bearing holes are misaligned, the connecting means can rotate while absorbing the misalignment of the axis of the divided shafts, and the axes of all the divided shafts can be accurately adjusted. Even when they are not well aligned on the same straight line, the entire shaft formed by connecting the divided shafts can be smoothly rotated. Further, the rotation angles of the plurality of divided shafts constituting the shaft can be made substantially the same. Further, by providing the connecting means on the split shaft, the number of parts and the number of assembling steps can be reduced, and the cost of the intake device can be reduced.
[0028]
According to the second aspect of the present invention, the divided shafts adjacent to each other can be bent in the longitudinal direction of the protrusion or the groove.
[0029]
According to the third aspect of the present invention, it is possible to absorb variations in the axial position of the divided shafts adjacent to each other.
[0030]
According to the invention of claim 4, since the shaft and the intake control valve are integrally formed, the number of parts and the number of assembling steps can be reduced, and the cost of the intake device can be reduced. it can.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of an intake device 1 showing one embodiment of the present invention.
FIG. 2 is a front view of the flange 9 in FIG. 1 as viewed from a cylinder head joining surface.
FIG. 3 is a sectional view taken along the line III-III in FIG. 2;
FIG. 4 is a front view showing a state in which the intake control valve 4 in FIG. 2 is closed.
FIG. 5 is a sectional view taken along line VV in FIG. 3;
FIG. 6 is a front view showing adjacent divided shafts 61 according to the embodiment of the present invention.
FIG. 7 is a sectional view taken along lines AA and BB in FIG. 6;
8 is a cross-sectional view of the connecting means 65 having ribs provided in the groove 61a according to one embodiment of the present invention, taken along the line AA and BB in FIG. 6;
FIG. 9 is a perspective view showing a connecting means 65 according to one embodiment of the present invention.
FIG. 10 is a front view showing a connection state of the connection means 65 according to the embodiment of the present invention.
11A and 11B are operation explanatory diagrams showing an operation state of the connecting means 65 of the present invention, in which FIG. 11A is an operation state in which an axial displacement is absorbed, FIG. c) shows a bent state in which the displacement in the direction of the groove 61a is absorbed.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Intake device 2 ... Housing 3 ... Intake passage 4 ... Intake control valve 5 ... Bearing hole 6 ... Shaft 7 ... Actuator 61 ... Split shaft 61a ... Groove 61b Projection 61c Parallel surface 61d Arc surface 61f e Length 61h Bottom 61j Tip 65 Connection means

Claims (4)

A housing,
A plurality of intake passages formed in the housing;
An intake control valve for opening and closing the intake passage;
A shaft fixed to the intake control valve and rotatably supported by a plurality of bearing holes provided in the intake passage;
An actuator for rotating the shaft, and an intake device for an internal combustion engine having:
The shaft is composed of a plurality of divided shafts, and the divided shafts adjacent to each other are formed at one end thereof and have grooves symmetrical with respect to the axis of the divided shaft and parallel to each other. And a projection formed at the other end and having an arcuate surface accommodated in the groove so as to be inscribed in the parallel surface. The length of the projection in the vertical direction with respect to the axis of the split shaft is set to be smaller than the length of the groove in the direction perpendicular to the axis of the split shaft. Intake device for internal combustion engines. The intake device for an internal combustion engine according to claim 1 or 2, wherein a gap is provided between a bottom of the groove and a tip of the protrusion. 4. The intake device for an internal combustion engine according to claim 1, wherein the split shaft supported by the adjacent bearing hole and the intake control valve are formed integrally.

Images