JP2000265860A - Throttle valve pipe piece for controlling output of internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately, surely and delicately control air flowing in the small output area of an internal combustion engine without taking plenty of time. SOLUTION: A gas passage 16 provided in a throttle valve 4 and a butterfly type throttle valve 6 pivoted in the throttle valve housing 4 so as to be freely turned around a turning axial line, are provided, a gas passage wall 18 includes a constriction range 20 capable of reducing the cross section of the passage in the range of a valve circumferential surface 26 in regard to a condition that the throttle valve 6 is turned to its closing position, and at least one recessed part 50 to be extended to the valve circumferential surface 26, is provided for at least, either one out of both the end surfaces 41 and 42 of the throttle valve 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tube-shaped throttle valve assembly or a throttle bubble tube for controlling the output of an internal combustion engine, which is provided in a throttle valve housing and provided in the throttle valve housing. A gas passage, a gas passage wall of the gas passage, and a butterfly-type throttle valve rotatably supported around a rotation axis in a throttle valve housing are provided, and the throttle valve has two end faces. And one valve peripheral surface, and is pivotable toward a closed position.

[0002]

In order to be able to fine-tune the output of an internal combustion engine, it has long been the case that the open cross section (free flow cross section) in the range of the closed position of the throttle valve during the swiveling movement of the throttle valve. Or the diaphragm cross section) is required to change only very slightly. For this reason, throttle valve tubing with an S-shaped gas passage wall in the region of the throttle valve located in the closed position is often used.
In the gas passage wall formed in the S-shape, the gas passage wall comes into close contact with the peripheral surface of the throttle valve over a certain angle range starting from the closed position of the throttle valve.
As a result, the throttle cross section through the gas passage changes only relatively slightly in the range of the closed position when adjusting the throttle valve. Another important requirement on the throttle valve tubing is that when the throttle valve is in the closed position, the leakage air is very low.

Known throttle valve tubing with S-shaped gas passage walls have the following disadvantages. That is, the manufacture of the known throttle valve tube piece is considerably difficult on the basis of its shape, and when the throttle valve is in the closed position, the amount of air leakage has not been reduced to a desired extent and the throttle valve tube Owing to the tolerances which have heretofore arisen during the production of large pieces, the jamming between the throttle valve and the gas passage wall occurs more or less frequently.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to improve a throttle valve tubing of the type described at the outset so that the amount of air leaking in the closed position of the throttle valve is reduced to a desired extent and the throttle valve and To provide a throttle valve tubing which can be easily manufactured, in which the trapping between the gas passage walls is reliably avoided and the air flowing therethrough can be very finely controlled in the region of low power of the internal combustion engine. That is.

[0005]

SUMMARY OF THE INVENTION In order to solve this problem, according to an embodiment of the present invention, for a throttle bubble swiveled to a closed position, the gas passage wall is reduced to the area of the valve periphery and the passage cross section is reduced. Has a narrowing stenosis range,
At least one of the two end surfaces of the throttle valve is provided with at least one concave portion extending to the peripheral surface of the valve.

[0006]

The throttle valve piece according to the invention for controlling the output of an internal combustion engine has the following advantages. In other words, the throttle cross section of the gas passage in the range of the closed position when the throttle valve is adjusted changes very little with respect to the adjustment angle of the throttle valve, so that very fine control of the output of the internal combustion engine is possible. Then, a throttle valve tube piece can be formed. In addition, the shape, size and depth of the concave portion,
Advantageously, this can be easily adjusted as required, so that the ratio of the throttle cross-section to the adjustment angle of the throttle valve can be adjusted very simply and easily and can be varied without great effort. .

[0007] The throttle valve pipe piece according to the present invention includes:
There is an advantage that a particularly gentle air characteristic line can be easily achieved in the idling region. In other words, the throttle valve piece can be designed in such a way that only small changes in the air flow occur in the range of the closed position of the throttle valve in response to adjustment of the throttle valve. Thereby, particularly simple idling control of the internal combustion engine is obtained.

[0008] The following advantages are obtained due to the narrowed area of the gas passage wall provided at the position occupied by the throttle valve when the throttle valve is in the closed position. That is, an edge can be easily provided on the gas passage wall that can be used to allow gas to flow only through the recess at a predetermined intermediate position of the throttle valve. The gas passage wall can advantageously be formed such that the recess does not function in the closed position of the throttle valve.

Advantageous improvements of the throttle valve tubing for controlling the output of an internal combustion engine according to claim 1 are made possible by the measures described below.

If the pivot axis is located outside a plane mainly formed by the peripheral surface of the valve, the time required for manufacturing the required individual components and the time required for assembling these individual components are increased. Is further reduced. It is particularly advantageous that a throttle valve tubing can be manufactured which has a particularly low production air, despite the low manufacturing effort. Another advantage is that components and materials that require relatively large dimensional and shape tolerances may also be used. This also results in a small amount of leaking air. An additional advantage is that the throttle valve can be adjusted so that no contact occurs between the throttle valve and the gas passage wall. This has the advantage that increased friction is avoided and therefore the actuation drive for adjusting the throttle valve does not have to be designed so strongly. The throttle valve tubing can be manufactured such that when the throttle valve is in the closed position, there is a narrow gap that allows only a very small amount of leaking air to pass through the entire circumference of the throttle valve. This narrow gap is advantageously not interrupted even in the region of the throttle valve shaft.

[0011] If the stenosis area has a spherical section shape, and the stenosis area is formed such that the center point of the sphere section shape is advantageously located at the center of the gas passage on the turning axis of the throttle valve shaft. In particular, only a small amount of leaked air is generated, and the amount of air flowing in the region of idling control of the internal combustion engine can be particularly finely controlled.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings.

[0013] The throttle valve tube or tube-like throttle valve assembly formed according to the present invention comprises:
It can be used in all internal combustion engines whose output is to be controlled by the gas flow supplied to the internal combustion engine. The gas is, for example, air or an air-fuel mixture. The internal combustion engine is, for example, an Otto engine in which a throttle valve piece is provided in the middle of an intake passage. In the internal combustion engine, in addition to the power control using the throttle valve tube piece, there may be other means for power control, for example, an output control means by selectively controlling the amount of fuel directly injected into the internal combustion engine. .

FIGS. 1 and 2 show longitudinal sections of a throttle valve assembly or throttle valve strip 2 according to a particularly preferred embodiment.

In all the drawings, the same components or components having the same function are denoted by the same reference numerals. Unless otherwise noted, features described with respect to one drawing also apply to other embodiments. Unless stated otherwise, the individual means of the various embodiments can be combined with one another.

The throttle valve pipe 2 has a throttle valve housing 4 and a butterfly type throttle valve 6.
And a throttle valve shaft 10. The throttle valve 6 is rigidly connected to a throttle valve shaft 10.

A gas passage 16 extends from one end face of the throttle valve housing 4 to the other end face of the throttle valve housing 4. The gas passage 16 is partitioned by a gas passage wall 18 on the peripheral surface side. The throttle valve shaft 10 is rotatably supported on the gas passage wall 18.

The throttle valve 6 has a predetermined closed position. The closed position of the throttle valve 6 is the position of the throttle valve 6 when the free cross section of the gas passage 16 is closed, or the throttle valve when the free cross section of the gas passage 16 reaches at least its minimum value. 6 position. In this closed position, the gas passage 16
No medium can flow through it, or only a very small amount of medium can flow through it.

FIG. 1 shows the throttle bubble pipe piece 2 with the throttle valve 6 in its closed position. FIG. 2 shows a state in which the throttle valve 6 has been swung from its closed position just to an intermediate position where the gas passage 16 extending through the throttle valve piece 2 is about to start opening.

The gas passage 16 or the gas passage wall 18 is
It has a reduced stenosis area 20 in cross section. As shown in FIG. 1, the gas passage 16 has a range having areas different in size from above and below the stenosis range 20.
The gas passage 16 has a first area 21 having a large area below the narrowed area 20 and a second area 22 having a small area above the narrowed area 20. The lower first area 21 has a larger cross section than the upper second area 22. The first area 22 has a diameter D. The second area 22 has a diameter d. As viewed in the longitudinal direction of the gas passage 16, the constriction area 20 is gradually narrowed to a greater or less extent between the first area 21 and the second area 22. The throttle valve 6 has a valve peripheral surface 26. The diameter d of the second area 22 is
The diameter D of the first range 21 is smaller than the diameter of the range of the valve peripheral surface 26 of the throttle valve 6.
The diameter of the throttle valve 6 is larger than the diameter of the valve peripheral surface 26. It should be noted that the free cross section of the suction or gas passage 16 and the cross section of the throttle valve 6 need not necessarily be circular, but may be, for example, oval or oval. First area 21 and / or second area 22 of gas passage 16
May be formed, for example, in a cylindrical shape (FIGS. 1, 2 and 7) or in a conical shape (FIG. 8). The throttle valve pipe piece 2 does not need to be spatially adjusted in the state shown in the figure, and can be used in a state of being arbitrarily rotated. For example, as shown in FIG. 8, the first range 21 may be located above the throttle valve 6.

When the throttle valve 6 is in the closed position, the valve peripheral surface 26 is located in the narrowed area 20 of the gas passage wall 18. When the throttle valve 6 is correctly mounted, the valve peripheral surface 26 of the throttle valve 6 and the constriction area 20 of the gas passage wall 18 are in the closed position.
There is a very narrow gap 30 extending all around.

The throttle valve 6 has a thick molded portion 32 integrally formed on one end surface thereof. The thick molded portion 32 and the throttle valve 6 are integrally molded from plastic. The thick molded portion 32 has the same length as the diameter of the throttle valve 6. Since the thick molded portion 32 that accommodates the throttle valve shaft 10 is located outside the range to be sealed, the thick molded portion 3
2 is a throttle valve 6 without undesired deterioration of the leak air volume.
May be formed significantly shorter than the diameter of. Advantageously, if the thick-walled portion 32 is formed to be slightly shorter than the diameter of the throttle valve 6, the risk of snagging between the throttle valve 6 and the throttle valve housing 4 is reduced.

A hole 34 extends through the thick molded portion 32. The throttle valve shaft 10 is rigidly connected to the throttle valve 6 in the hole 34.

In order to assemble the throttle valve tube 2, the following process is proposed. The throttle valve 6 is formed by using a predetermined device, and a valve peripheral surface 2 of the throttle valve 6 is used.
6 is pushed into the gas passage 16 until it abuts the narrowed area 20 of the gas passage wall 18. As a result, the throttle valve 6 is automatically centered in the horizontal direction,
The throttle valve 6 uniformly contacts the narrowed area 20 of the gas passage wall 18 over the entire circumference. At this time, the throttle valve 6 is located at a position hereinafter referred to as a “straightening position”. Starting from the straightened position, the throttle valve 6 is slightly lifted from the stenosis range 20. At this time, the valve peripheral surface 26 is slightly lifted from the stenosis area 20, thus forming the gap 30. This very narrow gap 30 can be very precisely adjusted to a very small value which can be determined precisely in advance. In this position thus obtained, the pivot bearing of the throttle valve 6 is fixed.

The throttle valve 6 is formed relatively thin in the area of the valve peripheral surface 26. Therefore, one virtual plane on which the valve peripheral surface 26 is located can be drawn. That is, the throttle valve 6 forms one plane in the range of the valve peripheral surface 26. The throttle valve shaft 10 is pivotally supported by the throttle valve housing 4. With such a support, the throttle valve shaft 10 has a pivot axis 40, about which the throttle bubble shaft 10 can be rotated or pivoted with the throttle valve 6. The pivot axis 40 has a clear space with respect to an imaginary plane formed by the valve peripheral surface 26. The distance between the pivot axis 40 and the virtual plane formed by the valve peripheral surface 26 is
Is formed to be significantly larger than the thickness in the range of the valve peripheral surface 26.

The throttle valve shaft 10 has a predetermined shaft diameter. Throttle valve shaft 1
In order to avoid leaking air flowing internally around the throttle valve shaft 10 in the area where 0 passes through the gas passage wall 18, at least the distance between the pivot axis 40 and the plane of the valve peripheral surface 26 must be It is proposed that the valve peripheral surface 26 be sized such that it can extend over the entire circumference of the throttle valve 6 without being interrupted by the throttle valve shaft 10. That is,
Preferably, the distance between the pivot axis 40 and the plane formed by the valve peripheral surface 26 is at least slightly larger than a value corresponding to half the diameter of the throttle valve shaft 10.

Since the swivel axis 40 has a predetermined space in the transverse direction perpendicular to the plane on which the valve peripheral surface 26 is located, the throttle valve 6 is inflated despite the narrow gap 30. The throttle valve 6 can be turned (rotated) without rubbing the passage wall 18.

As seen from the cross-sectional plane shown in FIG.
Advantageously, the 0 slope has the shape of a spherical segment or a spherical segment. The center point of this ball segment is the pivot axis 4
Advantageously, it is located at the center of gas passage 16 on zero or at the intersection of the pivot axis 40 with the longitudinal axis of gas passage 16. The stenosis area 20 is not caused to have a bent portion at the transition from the stenosis area 20 to the first area 21,
The constriction area 20 is formed so as to transition to the first area 21 of the gas passage wall 18 in a tangential direction. Stenosis area 20
A bent portion is formed at a transition portion between the second region 22 and the second region 22. This results in an edge 44. Advantageously, the gas passage wall 18 is formed such that this bend extends annularly over its entire circumference. Therefore, edge 4
Advantageously, 4 is an edge 44 extending all around. When the throttle valve 6 is in its closed position (FIG. 1), the edge 44 is farther away from the pivot axis 40 than the position of the valve peripheral surface 26. In other words, when the throttle valve 6 is located at the closed position, the edge 44 is located on the side opposite to the pivot axis 40 across the valve peripheral surface 26.

Starting from the closed position shown in FIG. 1, the throttle valve 6 can be moved in the opening direction. The opening direction is indicated by the arrow 46 in the drawing.

FIG. 3 shows the butterfly valve 6 of a rose-fly type alone at a changed scale for the sake of clarity. FIG. 3 is a view of the throttle valve 6 viewed in the observation direction indicated by III in FIG. FIG. 4 is a sectional view of the throttle valve 6 taken along the line IV-IV in FIG. FIG. 5 is an enlarged view of the range indicated by V in FIG. FIG. 6 is an enlarged view of the range indicated by VI in FIG.

The throttle valve 6 has a first end face 41 corresponding to the first area 21 and a second end face 42 corresponding to the second area 22. The diameter of the first end face 41 is slightly larger than the diameter of the second end face 42. As a result, the valve peripheral surface 26 is
Is tapered in the longitudinal direction. In other words,
As viewed in the longitudinal direction of the gas passage 16, the diameter of the valve peripheral surface 26 decreases from the first end surface 41 toward the second end surface 42.

The throttle valve 6 has an annular first valve edge 51 extending over the entire circumference at the transition between the valve peripheral surface 26 and the first end surface 41 (FIGS. 4 and 5).
And FIG. 6). Between the valve peripheral surface 26 and the second end surface 42, the throttle valve 6 has an annular second valve edge 52 which also extends over the entire circumference (see FIGS. 4 and 6).

The first end face 41 of the throttle valve 6 is provided with at least one recess 50. The recess 50 provided in the first end surface 41 of the throttle valve 6 extends radially outward until reaching the valve peripheral surface 26. However, since the at least one recess 50 does not connect the end faces 41 and 42 of the throttle valve 6 to each other, when the throttle valve 6 is located in the closed position, the narrow gap 30 is formed by the recess 5.
It is not interrupted by zero. The recess 50 is provided on the first end face 41 near the pivot axis 40. When viewed in the circumferential direction of the throttle valve 6, the recess 50 has a considerably small width, for example, 0.5 mm to 2 mm, that is, 0.00005.
m (meter) to 0.002 m (meter). Recess 5 extending to reach valve peripheral surface 26
0, the annular first valve edge 51 is located at the recess 50 in the second region 22 in the longitudinal direction of the gas passage 16.
(FIG. 6).

In order to realize an effective functional form of the recess 50 in order to obtain as good a precision controllability as possible, the recess 50 is most distant from a suitable point on the valve peripheral surface 26, ie from the pivot axis 40. In addition, it is proposed that the throttle valve 6 be provided in a region where the edge 44 is first overcome when the throttle valve 6 is turned in the opening direction 46 from the closed position. In other words, the recess 50 is advantageously provided on the peripheral surface of the throttle valve 6 at a location where the virtual diameter line drawn perpendicular to the swivel axis 40 intersects the valve peripheral surface 26 or at least in the area of this location. It is.

During the turning movement of the throttle valve 6 in the opening direction 46 starting from the closed position shown in FIG. 1, an intermediate position occurs when a part of the first valve edge 51 crosses the edge 44. A location exists (FIG. 2).

When the throttle valve 6 is pivoted in the opening direction 46 to the intermediate position shown in FIG. 2, only the portion of the first valve edge 51 extending to the bottom of the concave portion 50 becomes It crosses over the edge 44 of the gas passage wall 18. At this time, the valve peripheral surface 2 of the throttle valve 6
The gap 30 between 6 and the constricted area 20 of the gas passage wall 18 is fully closed over its entire circumference, but through the recess 50 already a small amount of gas can flow through the gas passage 16. I have. Edge 44 of gas passage wall 18
And the concave portion 50 provided in the throttle valve 6, the free cross section of the gas passage 16 can be adjusted very finely during the turning movement of the throttle valve 6. This makes it possible to achieve extremely delicate control of the output of the internal combustion engine with the achievable accuracy when operating the throttle valve 6.

Advantageously, the recess 50, when viewed in cross section, has a substantially triangular notch shape. As a result, the throttle valve 6 in the range of the intermediate position shown in FIG.
When adjusting, the free-iris cross section changes continuously. Based on such a triangular notch shape, the recess 50 can be formed relatively deep even in a relatively small cross section. Thus, the sensitivity of the recess 50 to contamination becomes relatively low.

In addition to the at least one recess 50, one further recess 50a or a plurality of further recesses 5
0a and 50b may be provided (FIG. 3). These further recesses 50 a, 50 b are also provided on the first end face 41 and also extend to the valve peripheral surface 26. These recesses 50a, 50b are provided on the first valve edge 51, for example, at an angle of up to 45 ° with respect to the first recess 50. Also,
If desired, it is also advantageous to provide these further recesses 50a, 50b immediately adjacent said first recess 50. By providing the plurality of recesses 50, 50a, 50b, these recesses 50, 5
0a and 50b act sequentially, and as a result, delicate control of the diaphragm cross section can be performed over a large angle range.

Based on the proposed combination consisting of the arrangement of the pivot axis 40 outside the plane formed by the valve peripheral surface 26, the arrangement of the constriction area 20 and the arrangement of the at least one recess 50, an overall On the one hand, it can be manufactured with very little effort and has a particularly low air leakage in the throttle valve 6 located in the closed position, and the output of the internal combustion engine is particularly delicate in the region of low power. A controllable tube-shaped throttle valve assembly or throttle valve tube 2 is obtained.

The valve peripheral surface 26 of the throttle valve 6 is formed in the shape of a spherical section, and this spherical section is formed on the gas passage wall 18.
It is proposed to adapt to the angle of the stenosis area 20 of.
This achieves that the gap 30 is formed as long and narrow as possible in the flow direction. This results in a particularly effective reduction of the leakage flow.

FIG. 7 shows a further particularly advantageous embodiment of the invention.

In this embodiment, another concave portion 60 is provided on the second end surface 42 in addition to the concave portion 50 provided on the first end surface 41. The recess 60 extends diagonally to the recess 50 along the second end surface 42 until it reaches the valve peripheral surface 26. This provides a controllability to improve the precision controllability when the gas passage 16 is open, even in this range of the throttle valve 6 and at a specific turning position of the throttle valve 6.

FIG. 8 shows a longitudinal section through a further advantageous embodiment of the invention. As this embodiment shows, the throttle valve 6 does not necessarily have to be formed flat. In addition, FIG.
However, the state of being located at a completely open position is drawn by a dashed line.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a throttle valve pipe piece according to the present invention in a state where a throttle valve is located at a closed position.

2 is a longitudinal sectional view showing the throttle valve pipe piece shown in FIG. 1 in a state where the throttle valve is slightly swung from a closed position.

FIG. 3 is a view of the throttle bubble as viewed in an observation direction indicated by an arrow III in FIG. 4;

4 is a cross-sectional view of the throttle bubble taken along line IV-IV in FIG. 3;

FIG. 5 is an enlarged view of a range indicated by V in FIG. 3;

FIG. 6 is an enlarged view showing a range indicated by VI in FIG. 4;

FIG. 7 is a longitudinal sectional view of a throttle valve tube piece according to a second embodiment of the present invention.

FIG. 8 is a vertical sectional view of a throttle valve tube piece according to a third embodiment of the present invention.

[Explanation of symbols]

2 Throttle valve tube piece, 4 Throttle valve housing, 6 Throttle valve, 10 Throttle valve shaft, 16 Gas passage, 18 Gas passage wall, 20 Narrowed area, 21 First area, 22
Second range, 26 valve circumference, 30 gap,
32 Thick molded part, 34 holes, 40 swivel axis, 4
1 first end face, 42 second end face, 44 edge,
46 opening direction, 50, 50a, 50b recess, 5
1 first valve edge, 52 second valve edge, 6
0 recess

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Uwe Hammer Mark Groningen Pappelweg 1

Claims (9)

[Claims] 1. A throttle bubble pipe piece for controlling an output of an internal combustion engine, comprising: a throttle valve housing (4); a gas passage (16) provided in the throttle valve housing (4); A gas passage wall (18) of the gas passage (16) and a butterfly valve type throttle valve (6) supported in the throttle valve housing (4) so as to be pivotable about a pivot axis (40) are provided. Wherein the throttle valve (6) has two end faces (41, 42) and one valve peripheral surface (26) and is pivotable toward the closed position; With respect to the throttle bubble (6) swirled up to, the gas passage wall (18) has a narrowing area (20) in the area of the valve peripheral surface (26) to reduce the passage cross section, At least one recess (50, 50a, 50b, 60) extending to reach the valve peripheral surface (26) is provided on at least one of the two end surfaces (41, 42) of the rottle valve (6). A throttle bubble tube for controlling the output of an internal combustion engine. 2. The recess (50, 50a, 50b, 6)
2. Throttle valve tubing according to claim 1, wherein 0) is formed by a notch. 3. The throttle valve piece according to claim 1, wherein the pivot axis lies outside a plane formed mainly by the valve peripheral surface. 4. One end face (41) of both end faces of the throttle valve (6) is located closer to the turning axis (40), and the other end face (42) is located on the turning axis line. (40), and is located on the side remote from the recess (5).
4. The throttle valve tube piece according to claim 3, wherein the end faces (0, 50a, 50b) are provided on the end face (41) closer to the pivot axis (40). 5. The throttle valve piece according to claim 4, wherein another recess (60) is provided in the end face (42) remote from the pivot axis (40). 6. The valve according to claim 1, wherein the valve peripheral surface of the throttle bubble is adapted to a constricted area of the gas passage wall. Throttle valve pipe piece. 7. The narrowed area (20) of the gas passage wall (18).
7. The throttle valve tubing according to claim 1, wherein at least a predetermined partial area has a spherical section shape. 8. The narrowed area (20) of the gas passage wall (18).
Extends conically at least in a predetermined sub-region,
The throttle valve pipe piece according to any one of claims 1 to 6. 9. The gas passage wall (18) is provided with an edge (44) that extends at least partially in an annular manner so as to adjust the throttle valve (6) between a closed position and an open position. The edge (44) is adapted to partially overlap the recess (50) at a predetermined intermediate position.
The throttle valve tube piece according to any one of claims 1 to 8.