JP2001173466A - Throttle control device for internal combustion engine, throttle valve and its making method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure of a throttle valve which can be easily inverted only by specified angle from a full close position in a reverse rotational direction, and secure a minimum opening area required for keeping idling, and its manufacturing method. SOLUTION: This throttle valve 3 has an oval form which has a longer axis along a center line 3c connecting attaching holes 3a to 3b. Even when a clearance A required for inversion is formed in respect to a throttle bore 1b, a minimum opening area required for idling can be secured. In addition, even when deposit is accumulated in the vicinity of a throttle shaft 2 of the throttle bore 1b, it can be scratched off with torque less than that at a front 3d.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a throttle valve control apparatus for an internal combustion engine, and more particularly, to a gap between the throttle valve and the throttle bore when the throttle valve is not controlled, and a minimum opening area during idling rotation. The present invention relates to a structure of a throttle valve that can be secured and a method of manufacturing the same.

[0002]

2. Description of the Related Art A butterfly valve type throttle valve 13 provided in an intake passage for controlling the amount of air supplied to an engine has been proposed, and one example thereof is shown in FIG. The throttle valve 13 shown by a solid line in FIG.
Holds the fully closed state in the throttle bore 11a constituting the intake passage, in a state in which it is inclined from the horizontal position by a predetermined set angle γ. When the engine is idling, the throttle valve 13 rotates in the positive direction (FIG. 6).
It rotates from the fully closed position (in the counterclockwise direction in (a)), is held at a slightly open position, and is operated with the opening area indicated by the hatched portion in FIG. 6 (b). Therefore, this throttle valve 1
When viewed from right above, perpendicularly to the plane, as shown in FIG. 7B, a center line (rotation center line of the valve) 1 connecting the screws 14 and 15 is formed.
It has an elliptical shape having a major axis in a direction perpendicular to 3c.

Japanese Patent Application No. 10-163 filed by the present applicant
As disclosed in Japanese Patent Application Laid-Open No. 827, a throttle valve control device has been proposed in which the engine is stopped by reversing the throttle valve from a fully closed position in a reverse direction by a predetermined angle when the throttle valve is not controlled such as when the engine is stopped. And
When the throttle valve 13 having the above configuration is used in such a device, the following problems occur. FIG. 7 (a)
FIG. 7 is a diagram showing an operation state of the throttle valve when the throttle valve is reversed in the reverse rotation direction (clockwise in the figure) during non-control, and a solid line in the figure shows the throttle valve in a fully closed position. In the above-described throttle valve control device, as shown in FIG. 7 (b), the longitudinal end 13d of the throttle valve 13 and the bore 11a in the fully closed position (horizontal state).
When a gap B required for reversing is provided between the valve 13 and the rotation center, a gap C larger than the gap B at the tip 13d is formed in a portion close to the center of rotation, and is thus formed by the valve 13 and the throttle bore 11a. The opening area becomes too large, and the minimum opening area required for idling rotation of the engine cannot be secured. Also, in order to use a true circular throttle valve 16 in order to facilitate the reversal, FIG.
As shown in (c), the tip portion 16d of the throttle valve 16
When a gap D required for inversion is provided between the
The same gap is also formed in a portion near the rotation center, and the minimum opening area required for idling rotation cannot be secured, as described above. 6B and FIG.
(B) and C, the gap shape indicated by the hatched portion is exaggerated and exaggerated from the actual size for easy understanding.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to easily reverse a predetermined angle in a reverse rotation direction from a fully closed position, and to secure a minimum opening area necessary for maintaining idling rotation. It is an object of the present invention to provide a configuration of a throttle valve and a method of manufacturing the same.

[0005]

According to a first aspect of the present invention, a throttle valve for opening and closing an intake passage of an engine is fixed to a throttle shaft provided across the intake passage. The engine output is controlled by rotating the throttle valve forward from the fully closed position to the fully open position and reversely rotating from the fully open position to the fully closed position.When the engine is stopped, the throttle valve is moved from the fully closed position to the reverse rotation side. In the throttle valve control device for an internal combustion engine configured to be inverted to a predetermined opening degree, the outer shape of the throttle valve is such that a long axis is a center line direction connecting a plurality of mounting holes for mounting the throttle valve to the throttle shaft. Characterized by being formed in an elliptical shape. According to a second aspect of the present invention, in the throttle valve control device according to the first aspect, a ridge line is formed on an outer periphery of the throttle valve so as to extend outward from both sides of the valve and to form a central portion in the thickness direction of the valve. Characterized in that an inclined surface is formed. The invention according to claim 3 is the throttle valve control device according to claim 2, wherein the inclined surface has a larger angle with respect to each surface of the throttle valve at both ends in the long axis direction than at both ends in the short axis direction. It is characterized by being formed. According to a fourth aspect of the present invention, in the throttle valve control device according to the first aspect, the throttle valve tilts the center line connecting the mounting holes by a predetermined angle with respect to a direction orthogonal to a machining center of the machine tool. In this state, it is set on the machine tool, and after processing the outer peripheral portion, the center line is set to 18
The elliptical shape is obtained by turning over by 0 degree, turning over, and processing the outer peripheral portion again.
According to a fifth aspect of the present invention, in the throttle valve control device according to the fourth aspect, the mounting hole is formed in an elliptical shape, and the processing core is inserted in a state where a processing shaft of the machine tool is penetrated. Is characterized in that it can be inclined by a predetermined angle with respect to a direction perpendicular to the direction. Claim 1
A throttle valve according to any one of claims 1 to 5. And, in order to solve the above-mentioned problem, the present invention relates to claim 1
The invention according to 1 is a method for manufacturing a throttle valve used in a throttle valve control device for an internal combustion engine, wherein the throttle valve material is connected to the mounting hole in a direction orthogonal to a machining center of a machine tool. The center line is fixed so as to be inclined at a predetermined angle, the outer peripheral portion of the valve material is processed, the throttle valve material is turned upside down by 180 degrees around the center line, the outer peripheral portion is processed again, and the predetermined An elliptical throttle valve having a major axis and a minor axis is formed. According to a twelfth aspect of the present invention, in the method for manufacturing a throttle valve according to the eleventh aspect, the outer peripheral portion of the throttle valve material is processed while being rotated about a processing center of the machine tool. . According to a thirteenth aspect of the present invention, in the method for manufacturing a throttle valve according to the eleventh aspect, a plurality of mounting holes are formed in the throttle valve material in advance such that a major axis thereof coincides with a major axis of the material. It is characterized by being formed.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1A is a schematic longitudinal sectional view of a throttle body showing an operation state of a throttle valve according to the present embodiment, and FIG. 1B is a top view when the throttle valve is at a minimum flow rate opening (fully closed) position. FIG. FIG. 1 (b)
The hatched portion indicates a gap between the throttle valve and the throttle bore, and is exaggerated from the actual size for easy understanding.

In FIG. 1, a throttle shaft 2 is rotatably penetrated into a throttle body main body 1 across an intake passage 1a formed in the throttle body main body 1,
A throttle valve 3 is fixed to the shaft 2 with screws 4 and 5. The throttle valve 3 has two mounting holes 3a,
3b (see FIG. 3 (b); in FIG.
It is formed in an elliptical shape having a major axis at the center line 3c (shaft axis) connecting 5). In this embodiment, the throttle valve 3 has a nominal diameter of φ60 mm (major axis diameter = φ60.00).
6, short axis diameter = φ59.95) is used. Further, an inclined surface is formed in the outer peripheral portion of the throttle valve 3 so as to form a ridge line (3g; see FIG. 3 (a)) at the center in the plate thickness direction. At both ends in the major axis direction, the valve 3 is formed at a larger angle with respect to each surface of the valve 3.

Between the front end 3d of the throttle valve 3 in the short axis direction and the throttle bore 1b, the throttle valve 3 can be reversed in the reverse rotation direction (clockwise in the figure) from a fully closed position to a position at the time of non-control. Is formed with a predetermined gap A. Since the throttle valve 3 is formed in an elliptical shape and its long axis is fixed along the shaft 2, even if a predetermined gap A for reversing is provided at the tip 3d, the root portion (long axis direction) The gap becomes narrower as approaching (end portion) 3e. Therefore, a minimum opening area for maintaining the idling rotation of the engine can be secured as the total clearance area, and when the engine is not controlled, the intake passage 11a
It can easily rotate in the reverse rotation direction from the fully closed position without contacting the inner wall. Further, since the throttle valve 3 has an inclined surface formed at the largest angle with respect to each surface at both ends in the long axis direction, when not controlled, the outer periphery of the valve 3 is more smoothly engaged with the bore 1b without being engaged. Can be rotated in reverse.

Next, a method of manufacturing the throttle valve 3 according to the present embodiment will be described with reference to FIGS.
The throttle valve blank 30 in which two oblong mounting holes 3a, 3b having a major axis on the major axis diameter of the throttle valve 3 are drilled in advance is horizontally moved in the direction of the major diameter side center line 3c connecting the mounting holes 3a, 3b. A semi-finished throttle valve 30 is formed by rotating around a shaft center 3f, which is a machining center of a machine tool (for example, a lathe), in a state where the throttle valve 30 is inclined from the position by a predetermined angle α. The shape after the processing is shown in FIGS. The processing method may be any of lathe, press, grinding, laser processing and other processing methods.

Next, as shown in FIGS. 2C and 2D,
The semi-finished throttle valve 30 is turned upside down by 180 degrees about the center line 3c, and fixed by a jig 42 in a state where it is inclined at a predetermined angle in the same manner as described above. The outer periphery is processed by rotating the lathe again about the axis 3f, and an inclined surface is formed on the outer peripheral portion as shown in FIGS. 2 (e) and 2 (f). In this way, an elliptical valve having a predetermined major and minor axis diameter is formed.

FIGS. 3A and 3B are a side view and a top view of the throttle valve 3 formed by the manufacturing method.
As shown in these figures, the throttle valve 3 of this embodiment
Is formed in an elliptical shape having a predetermined major axis and minor axis diameter, an outer peripheral portion thereof is formed with an inclined surface that is inclined outward from both sides of the valve, and a ridgeline 3g is formed in a thickness direction central portion thereof. The inclined surface has both ends 3e in the major axis direction and both ends 3d in the minor axis direction.
It is formed at a large angle to each face of the valve.

In this embodiment, the diameter of the throttle valve 3 is standardized to φ40 to φ76 mm. FIG. 4 is a table showing the major axis diameter DL, the minor axis diameter DS, and the inclination angle α at the time of machining the valve blank 30 for each nominal diameter. For example, nominal diameter φ
When manufacturing a 40 mm throttle valve, the major axis diameter is φ4
0.006 mm, the minor axis diameter is 39.97 mm, and the inclination angle α is 2.431 °. In this case, the intake passage 1
The bore diameter of the bore 1b constituting a is slightly larger than φ40 mm.

[0013] Further, when the outer periphery is processed, a single throttle valve can be used. However, as shown in FIG. 5, a method of processing by overlapping a plurality of throttle valves is more efficient. Specifically, in the present embodiment, as shown in FIG. 5, a plurality of (five in the figure) throttle valve blanks 30 are processed at once as follows. First, each of the mounting holes 3a, 3a, 3
For example, a machining shaft 40 of a lathe is made to pass through b.
Then, it is inclined by a predetermined angle α with respect to a direction (horizontal direction) perpendicular to the axis 3f, and is held by a fixing jig 42 of a lathe. This inclination angle α is an angle standardized in advance according to the nominal diameter of the throttle valve to be manufactured in the present embodiment (see FIG. 4).

In this embodiment, since the mounting holes 3a and 3b have an oval shape, the mounting holes 3a and 3b can be inclined with respect to the machining shaft while the machining shaft 40 is penetrated. The oblong mounting holes 3a and 3b correspond to the component tolerances of the throttle valve 3 and the throttle shaft 2 when the throttle valve 3 is actually mounted and fixed to the throttle shaft 2. The mounting holes 3a and 3b may be formed after the outer peripheral processing is performed. In this case, for example, the surface of the valve may be directly held by the jig 42 and fixed to the machine tool without using the machining shaft 40.

Next, the operation of the throttle valve control device provided with the throttle valve 3 manufactured as described above will be described. In FIG. 1A, the engine output is controlled by controlling the opening and closing of a throttle valve 3 within an operating range from a minimum flow rate opening to a full opening position. Here, the direction from the minimum flow rate opening to the full opening (counterclockwise in the figure) is referred to as a forward rotation direction, and the opposite (clockwise in the figure) is referred to as a reverse rotation direction. During idling rotation, the throttle valve 3 is held at a position slightly opened in the forward rotation direction from the minimum flow opening. On the other hand, the throttle valve 3 is, for example,
At the time of non-control such as when the engine is stopped, the throttle valve 3 is prevented from freezing and fixing at extremely low temperatures, thereby preventing the engine from starting poorly due to inability to open the throttle valve. The opening is inverted by a predetermined angle β.

Since a gap A required for reversing is secured between the tip 3d of the throttle valve 3 and the throttle bore 1b, the reversing can be performed without any trouble when not controlled. Further, since the throttle valve 3 is formed in an elliptical shape whose long axis is the center line 3c fixed to the throttle shaft 2, even when the throttle valve 3 is slightly rotated in the normal rotation direction at the time of idling, the gap area does not become excessively large. The minimum opening area required at the time of idling rotation can be sufficiently ensured. Since a gap is ensured at the tip 3d of the throttle valve 3, deposits rarely accumulate during idling rotation, but may accumulate near the root 3e. In this case, the deposited deposit can be scraped off with a smaller rotational torque than the tip 3d by inverting the throttle valve 3 during non-control.

[0017]

The present invention has the following effects because it is configured as described above. That is, since the throttle valve is formed in an elliptical shape having a major axis in the axial direction of the throttle shaft, the minimum opening required for idling rotation is provided even if a gap necessary for reversing the throttle bore is provided. The area can be secured. In addition, even when deposits are deposited near the throttle shaft of the throttle bore during idling rotation, the throttle valve is inverted, so that it can be scraped off with less rotational torque than at the tip.

[Brief description of the drawings]

FIG. 1A is a longitudinal sectional view showing an operation state of a throttle valve according to an embodiment of the present invention. FIG. 1B is a top view of the throttle valve at the minimum flow opening.

2 (a), 2 (c) and 2 (e) are side views of the throttle valve at each processing stage showing a method of manufacturing a throttle valve according to an embodiment of the present invention. FIG. 2 (b) (d)
(F) is each bottom view.

FIG. 3A is a side view of a throttle valve according to an embodiment of the present invention. FIG. 3B is a top view thereof.

FIG. 4 is a table of the nominal diameter of the throttle valve standardized in the embodiment of the present invention.

FIG. 5 is a side view of a plurality of throttle valve materials set in a machine tool for processing as shown in FIG. 2;

FIG. 6 (a) is a longitudinal sectional view showing an operation state of a throttle valve in a conventional technique. FIG. 6B is a top view of the throttle valve of FIG. 6A when the engine is idling.

FIG. 7A is a vertical cross-sectional view showing an operation state of a throttle valve in a case where the throttle valve is reversed in a reverse rotation direction during non-control. FIG. 7B shows a horizontal (fully closed) state when the conventional throttle valve shown in FIG. 6B is used in the apparatus shown in FIG. 7A.
It is a top view at the time. FIG. 7C is a top view when the true circular throttle valve is used in the apparatus shown in FIG. 7A when it is horizontal (fully closed).

[Explanation of symbols]

 1a intake passage 3 throttle valve 3a mounting hole 3b mounting hole 3c center line

Claims (13)

[Claims] 1. A throttle valve for opening and closing an intake passage of an engine is fixed to a throttle shaft provided across the intake passage, rotates the throttle valve forward from a fully closed position to a fully open position, and completely closes the throttle valve from a fully open position. A throttle valve control device for an internal combustion engine configured to control the engine output by reversing the throttle valve to a predetermined position and reversing the throttle valve from the fully closed position to the reverse rotation side to a predetermined opening when the engine is stopped; A throttle valve control device for an internal combustion engine, wherein the outer shape of the valve is formed in an elliptical shape whose major axis is a center line direction connecting a plurality of mounting holes for mounting the throttle valve to the throttle shaft. . 2. The throttle valve control device according to claim 1, wherein an inclined surface extending outward from both surfaces of the valve and forming a ridge at a center in a thickness direction of the valve is formed on an outer periphery of the throttle valve. A throttle valve control device for an internal combustion engine. 3. The throttle valve control device according to claim 2, wherein the inclined surface is formed at a larger angle with respect to each surface of the throttle valve at both ends in the long axis direction than at both ends in the short axis direction. A throttle valve control device for an internal combustion engine. 4. The throttle valve control device according to claim 1, wherein the center line connecting the mounting holes is inclined by a predetermined angle with respect to a direction orthogonal to a machining center of a machine tool. Then, after being set on the machine tool and processing the outer peripheral portion, it is turned 180 degrees around the center line and turned over,
The throttle valve control device for an internal combustion engine, wherein the elliptical shape is formed by processing an outer peripheral portion again. 5. The throttle valve control device according to claim 4, wherein the mounting hole is formed in an elliptical shape, and a direction perpendicular to the processing core when a processing shaft of the machine tool is penetrated. A throttle valve control device for an internal combustion engine, which can be inclined by a predetermined angle with respect to 6. A throttle valve for opening and closing an intake passage of an engine, wherein the outer shape of the throttle valve is an elliptical shape whose major axis is a center line direction connecting a plurality of mounting holes for mounting the throttle valve to a throttle shaft. A throttle valve characterized by being formed. 7. The throttle valve according to claim 6, wherein an outer peripheral surface of the throttle valve is formed with an inclined surface extending outward from both surfaces of the valve and forming a ridge at a central portion in a thickness direction of the valve. A throttle valve. 8. The throttle valve according to claim 7, wherein the inclined surface is formed at a larger angle with respect to each surface of the throttle valve at both ends in the long axis direction than at both ends in the short axis direction. A throttle valve. 9. The throttle valve according to claim 6, wherein the throttle valve is configured such that the center line connecting the mounting holes is inclined at a predetermined angle with respect to a direction orthogonal to a machining center of a machine tool. The throttle is formed in the elliptical shape by setting it on the machine tool, processing the outer peripheral portion, turning over the center line by 180 degrees and turning over, and processing the outer peripheral portion again. valve. 10. The throttle valve according to claim 9, wherein the mounting hole is formed in an elliptical shape, and is provided in a direction perpendicular to the processing core in a state where a processing shaft of the machine tool is penetrated. A throttle valve which can be tilted at a predetermined angle. 11. The method according to claim 6, wherein
A method for manufacturing a throttle valve, comprising: fixing a throttle valve material such that the center line connecting the mounting holes is inclined at a predetermined angle with respect to a direction orthogonal to a machining center of a machine tool; Processing the portion, turning the throttle valve material 180 degrees around the center line and turning it over, and processing the outer peripheral portion again to form an elliptical throttle valve having a predetermined long and short axis diameter. Throttle valve manufacturing method. 12. The method of manufacturing a throttle valve according to claim 11, wherein an outer peripheral portion of the throttle valve material is processed while being rotated about a processing center of the machine tool. Method. 13. The method of manufacturing a throttle valve according to claim 11, wherein a plurality of mounting holes are formed in advance in the throttle valve material such that a major axis thereof coincides with a major axis of the material. A method for manufacturing a throttle valve, comprising: