JP4451025B2 - Engine intake air amount control device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
According to the present invention, a butterfly throttle valve with a valve shaft is inserted into an insertion hole provided on one side wall of a valve body having an intake passage from the shaft end thereof, and the throttle valve is accommodated in the intake passage. Is provided with a bearing hole formed in the valve body, and a lid body for closing the insertion hole is joined to one side wall of the valve body.
[0002]
[Prior art]
Japanese Unexamined Patent Publication No. 6-213334, the insertion hole provided in one side wall of the exhaust pipe, by inserting a butterfly exhaust control valve with the valve shaft from the shaft end, to accommodate the exhaust control valve in the exhaust pipe In addition, an engine in which one end of the valve shaft is supported by a first bearing provided on one side wall of the exhaust pipe, and a second bearing that supports the other end of the valve shaft is provided in a lid that closes the insertion hole. An exhaust control apparatus is disclosed. According to such a configuration of the exhaust control device, an exhaust control valve with a valve shaft can be manufactured before being attached to the exhaust pipe, and it is easy to attach the valve to the exhaust pipe.
[0003]
[Problems to be solved by the invention]
By the way, in the exhaust control device, since the first and second bearings for supporting both ends of the valve shaft are provided in the exhaust pipe and the lid body manufactured separately, the first and second bearings are processed and assembled. A high degree of consideration is required to improve the coaxial accuracy of the two bearings. Therefore, it is conceivable that the first and second bearing holes for supporting both ends of the valve shaft are coaxially machined on both end walls of the exhaust pipe. However, if this is done , the insertion hole passes through one of the bearing holes and is fully closed. consisting of the control valve extend over Gukoto. Therefore, when this is applied to the intake air amount control device, the engine intake air passes through the throttle valve position through the insertion hole in the fully closed state of the throttle valve, making it difficult to perform precise intake air control during idling of the engine. To.
[0004]
The present invention has been made in view of the above points. When the first and second bearing holes for supporting both ends of the valve shaft are formed in the valve body, the throttle with the valve shaft is formed in the valve body. The intake air amount so that the insertion hole for the valve does not straddle the throttle valve in the fully closed state so that the intake air of the engine does not pass through the throttle valve position through the insertion hole in the fully closed state of the throttle valve. An object is to provide a control device.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, a butterfly throttle valve with a valve shaft is inserted into an insertion hole provided in one side wall of a valve body having an intake passage from its shaft end, and the throttle valve is sucked into the intake valve. An intake air amount control device for an engine, which is housed in a road, has a valve shaft supported by a bearing hole formed in the valve body, and a lid that closes the insertion hole is joined to one side wall of the valve body. The first and second bearing holes for supporting both ends of the valve shaft are formed in the valve body, and the rotation axis passing through the rotation center of the valve shaft is offset to one side from the central axis of the intake passage. to place such, also the throttle valve, in its fully closed position and arranged to axially offset the intake path from the rotational axis of the valve shaft, the insertion hole, slot The passage of the throttle valve with valve shaft capable that formed in to so that when the rotation direction of the valve from the fully open position toward the closed position at the insertion position rotated approximately 90 ° in the opposite direction First feature.
[0006]
The lid corresponds to a casing in an embodiment of the present invention described later.
[0007]
According to the first feature, since the so that provided both the valve body the first and second bearing holes for supporting the opposite ends of the valve shaft, in the processing of these bearing holes, their coaxial accuracy easily The valve shaft can be supported properly. In addition , an insertion hole for a throttle valve with a valve shaft communicates with one of the first and second bearing holes. When the throttle valve is in a fully closed position, the valve and the insertion hole are in the axial direction of the intake passage. will be separated, since the insertion hole is never cross the throttle valve, can be reliably prevented that the intake of the engine in a fully closed state of the throttle valve Ru through the throttle valve position through the insertion holes, the engine idling It is possible to precisely perform the intake control at the time.
[0008]
The present invention, in addition to the first feature, the insertion hole, the second, characterized in that disposed upstream of the intake paths of the throttle valve when in the fully closed position.
[0009]
According to the second feature, when the throttle valve is in the fully closed state, the high intake negative pressure of the engine does not act on the insertion hole. Therefore, even if the insertion hole is blocked somewhat by the lid, the outside air Can be prevented from being sucked into the intake passage through the insertion hole.
[0010]
Furthermore, in addition to the first or second feature, the present invention is a portion of the outer peripheral portion of the throttle valve that protrudes radially outward from the outer peripheral surface of the valve shaft, and the throttle valve is in the fully open position from the fully closed position. A third feature is that a clearance that avoids interference with the inner peripheral surface of the intake passage is provided in a portion that moves outward in the radial direction of the intake passage when rotating toward .
[0011]
According to the third feature, when the throttle valve is opened from the fully closed state , the outer peripheral portion that moves radially outward of the intake passage as the valve rotates is interfered with the inner peripheral surface of the intake passage. it is possible to avoid the can to I smoothly line opening and closing of the throttle valve.
[0012]
The present invention, in addition to any of the first to third feature, the throttle valve with the valve shaft, a fourth feature that it has integrally molded with the same material.
[0013]
According to the fourth feature, the number of parts and the number of assembly steps can be reduced by integrally forming the throttle valve with a valve shaft by injection molding, casting, or forging.
[0014]
The present invention, in addition to the fourth feature, the throttle valve with valve shaft, the throttle arm to apply a rotational force thereto, and fifth, characterized in that integrally molded with the same material.
[0015]
According to the fifth feature, the number of parts and the number of assembling steps can be further reduced by integrally forming the valve shaft and the throttle valve with the throttle arm by injection molding, casting, or forging.
[0016]
The present invention, in addition to the fourth feature, the throttle valve with the valve shaft, with a synthetic resin and a sixth feature of the integrally molded.
[0017]
According to the sixth feature, the weight of the throttle valve with a valve shaft can be reduced.
[0018]
The present invention, in addition to the fifth feature, the throttle valve and the throttle arm with the valve shaft, with a synthetic resin and seventh aspect of the integrally molded.
[0019]
According to the seventh feature, the weight of the throttle valve with the valve shaft and the throttle arm can be reduced.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below on the basis of the actual施例of the present invention shown in the accompanying drawings.
[0021]
1 is a longitudinal side view of an intake air amount control apparatus for an engine according to a first embodiment of the present invention, FIG. 2 is a sectional view taken along line 2-2 of FIG. 1, and FIG. 3 is a sectional view taken along line 3-3 of FIG. 4 is a perspective view of the throttle valve with a valve shaft in the intake air amount control device of the engine, and FIG. 5 is an explanatory diagram of the assembly procedure of the intake air amount control device of the engine, and shows the state before insertion into the insertion hole of the throttle valve with valve shaft Indicates. 6 is a view corresponding to FIG. 1 showing a state immediately after insertion of the throttle valve with a valve shaft into the insertion hole, FIG. 7 is a sectional view taken along line 7-7 of FIG. 6, and FIG. 8 is a second embodiment of the present invention. FIG. 9 is a sectional view corresponding to FIG. 3, and FIG. 9 is a sectional view taken along line 9-9 of FIG.
[0022]
First, the description starts with the description of the first embodiment of the present invention. In FIG. 1, a valve body 2 of an intake air amount control device 1 for an engine includes an intake passage 3 connected to an intake port of the engine, and a flange 4 at the downstream end of the intake passage 3 and joined to the cylinder head of the engine. The air purified by the air cleaner is sucked from the upstream side of the intake passage 3. A butterfly-type throttle valve 5 for controlling the intake air amount of the engine is disposed in the middle portion of the intake passage 3, and a valve shaft 6 that supports the throttle valve 5 is rotatably supported on the valve body 2 in a horizontal posture. Is done. The valve body 2 is attached with an electromagnetic fuel injection valve 7 for injecting fuel into the intake port of the engine through the intake passage 3 downstream of the throttle valve 5. Reference numeral 8 denotes a mounting hole provided in the valve body 2 to which the fuel injection valve 7 is attached.
[0023]
As shown in FIGS. 1 to 4, the valve shaft 6 has a short shaft 6 a integrally connected to one end of the throttle valve 5, and the other end of the throttle valve 5 along the same axis as the short shaft 6 a. The long shaft 6b is integrally formed. Therefore, both the front and back surfaces of the throttle valve 5 are flat surfaces without protrusions, which contributes to reducing the intake resistance in the intake passage 3.
[0024]
A drum-type throttle arm 9 is integrally formed at the outer end of the long shaft 6b. Such a throttle valve 5 with the valve shaft 6 and the throttle arm 9 is integrally injection-molded using the same synthetic resin as a material. The short shaft 6a and the long shaft 6b are rotatably supported by first and second bearing holes 11 and 12 formed in the left and right side walls of the valve body 2, respectively.
[0025]
If the valve shaft 6 and the throttle valve 5 with the throttle arm 9 are integrally formed as described above, it is possible to reduce the number of parts and the number of processing steps, thereby contributing to cost reduction. Moreover, it can contribute also to weight reduction by making this into a product made from a synthetic resin.
[0026]
The outer end of the first bearing hole 11 is closed by an end wall integral with the valve body 2, the outer end of the second bearing hole 12 is opened, and a flange 13 integral with the valve body 2 is formed on the open end side. Be placed. A casing 17 is joined to the flange 13 with a screw 15 via a seal member 14. At that time, annular positioning concave portions 21 and convex portions 22 which are fitted to each other are formed on the joint surfaces of the flange 13 and the casing 17. The casing 17 accommodates a throttle arm 9 and a return spring 16 that urges the throttle arm 9 in the closing direction of the throttle valve 5. An accelerator operating member (not shown) is connected to the throttle arm 9 via an operating wire 19, and the throttle valve 5 can be opened by pulling the operating wire 19 with the accelerator operating member.
[0027]
The casing 17 includes a casing main body 17a on the flange 13 side and a cover 17b that is detachably coupled to the casing main body 17a via a seal member 18. A through hole (not shown) through which the operation wire 19 is inserted into the cover 17b. And a sealing means for blocking the inside of the casing 17 from the outside air.
[0028]
The valve body 2 and the casing body 17a are formed with a series of insertion holes 20 that reach the intake passage 3 from the inner surface of the casing body 17a through the second bearing hole 12, and the throttle valve 5 with the valve shaft 6 is It is mounted on the valve body 2 through the insertion hole 20, and for this purpose, each part of the intake air amount control device 1 is configured as follows.
[0029]
The first and second bearing holes 11 and 12 are formed such that the rotation axis Y passing through the rotation center of the valve shaft 6 is offset from the center axis X of the intake passage 3 by one distance (upward in the illustrated example) by a distance a. Is done. While the throttle valve 5 is full the closed position C (see FIG. 1), the axial direction (the example of the intake path 3 from the axis of rotation Y of the valve shaft 6 an outer peripheral surface thereof comes into close contact with the inner peripheral surface of the intake passage 3 Then, it is arranged so as to be offset by a distance b on the downstream side. The insertion hole 20 is an insertion position I obtained by rotating the throttle valve 5 by approximately 90 ° in a direction opposite to the rotation direction from the fully open position O to the fully closed position C where the throttle valve 5 is parallel to the central axis X of the intake passage 3. (see FIG. 6), it is made shaped to permit passage of the valve shaft with 6 throttle valve 5. Therefore, at the insertion position I of the throttle valve 5, the valve 5 and the insertion hole 20 are positioned upstream of the intake passage 3 from the rotational axis Y of the valve shaft 6.
[0030]
When the throttle valve 5 with the valve shaft 6 is attached to the valve body 2, as shown in FIG. 5, first, the return spring 16 is fitted on the outer periphery of the long shaft 6b of the valve shaft 6, and one end thereof is attached to the throttle arm 9. Lock. Then, the throttle valve 5 with the valve shaft 6 is inserted into the insertion hole 20 of the casing body 17a from the short shaft 6a side, and the other end of the return spring 16 is locked to the casing body 17a.
[0031]
Next, the throttle valve 5 is rotated to the insertion position I with respect to the valve body 2 against the return force of the return spring 16, and in this state, the throttle valve 5 with the valve shaft 6 is inserted into the insertion hole 20 of the valve body 2 with a short shaft. inserted from 6a side, inserting the short axis 6a and the major axis 6b of the valve shaft 6 Rutotomoni is fitted to the first and second bearing holes 11 and 12 of the valve body 2, the throttle valve 5 in the intake passage 3 . Then, the casing body 17 a is fixed to a fixed position of the flange 13 of the valve body 2 with screws 15. At this time, as shown in FIG. 6, the throttle valve 5 is shifted from the rotation axis Y of the valve shaft 6 to the upstream side of the intake passage 3 and above the central axis X of the intake passage 3.
[0032]
Therefore, returning the biasing force of the spring 16, lever the throttle valve 5 is rotated substantially 180 ° in the direction closing the valve shaft 6, the throttle valve 5 is fully closed to close the outer peripheral surface to the inner peripheral surface of the intake passage 3 Position C is reached (see FIG. 1). At this time, the throttle valve 5 is moved to the downstream side of the intake passage 3 with respect to the rotational axis Y of the valve shaft 6, contrary to the insertion into the insertion hole 20. 5 is located upstream of the intake passage 3 (see FIG. 1).
[0033]
Thereafter, the cover 17b is coupled to the casing body 17a, whereby the insertion hole 20 is blocked from communicating with the outside air. The mounting operation of the throttle valve 5 with the valve shaft 6 is thus completed.
[0034]
And Thus, the first and second bearing hole 11, 12 for supporting the minor axis 6a and the major axis 6b of the valve shaft 6, respectively, since both are formed in the valve body 2, coaxial machining of these bearing holes 11 and 12 Therefore, the high coaxial accuracy can be easily obtained, and the valve shaft 6 can be supported properly to ensure the smooth opening and closing of the throttle valve 5.
[0035]
Moreover, although the second bearing hole 12 is in communication with the insertion hole 20, the throttle valve 5 occupies a position shifted in the axial direction of the intake passage 3 with respect to the insertion hole 20 in the fully closed position C. 20 are not able to cross the throttle valve 5, thus the intake of the engine in a fully closed state of the throttle valve 5 is not Rukoto through the throttle valve 5 positioned through the insertion hole 20. In particular, when the insertion hole 20 is disposed upstream of the throttle valve 5 when the insertion hole 20 is in the fully closed position C as shown in the drawing, high intake negative pressure of the engine acts on the insertion hole 20. there is no necessity to, even if there is some defect in the disconnection between the outside air of the insertion hole 20, preventing the fully closed time of the throttle valve 5, the outside air is sucked into the intake passage 3 through the insertion hole 20 Can do. Thus, it is possible to precisely perform intake air control during engine idling.
[0036]
By the way, the throttle valve 5 is located downstream of the intake passage 3 from the rotation axis Y of the valve shaft 6 in the fully closed position C. Therefore, when the valve 5 is opened from the fully closed position C, the valve 5 of, the outer peripheral portion of the portion to rotate toward the upper stream side of the intake path 3 (the lower half of the throttle valve 5 in FIG. 1), the root linked to the valve shaft 6, the central portion side of the intake passage 3 It moves outward in the radial direction and interferes with the inner peripheral surface of the intake passage 3.
[0037]
Therefore, a relief 23 for avoiding interference with the inner peripheral surface of the intake passage 3 is provided at the base of the outer peripheral portion of the throttle valve 5. This ensures a smooth opening / closing operation of the throttle valve 5.
[0038]
Next, a second embodiment of the present invention shown in FIGS. 8 and 9 will be described.
[0039]
In the second embodiment, when assembling the intake air amount control device 1, the short shaft 6 a and the long shaft 6 b of the valve body 6 are inserted into the insertion hole 20 of the valve body 2 from the short shaft 6 a side. Rutotomoni is fitted to the first and second bearing holes 11 and 12, insert the throttle valve 5 in the intake passage 3, the casing body 17a by 180 ° is rotated around the valve shaft 6, the valve body 2 side The phase of the insertion hole 20 on the casing body 17a side is shifted by 180 ° with respect to the insertion hole 20. As a result, the insertion hole 20 on the valve body 2 side and the insertion hole 20 on the casing body 17a side are arranged apart from each other with the rotation axis Y of the valve shaft 6 interposed therebetween. If the casing body 17a is fixed to the flange 13 of the valve body 2 with screws 15, the outer end of the insertion hole 20 on the valve body 2 side can be closed by the casing body 17a. Therefore, in this embodiment, there is no problem even if the inside of the casing 17 is opened to the outside air.
[0040]
Since the other configuration is the same as that of the previous embodiment, portions corresponding to those of the previous embodiment are denoted by the same reference numerals in FIGS. 8 and 9 and description thereof is omitted.
[0041]
The present invention is not limited to the above embodiments, and various design changes can be made without departing from the scope of the invention. For example, the valve shaft 6 and the throttle valve 5 with the throttle arm 9 can be integrally formed by casting or forging. Further, when the valve shaft 6 and the throttle arm 9 are configured to be separable from each other, it is not necessary to provide the insertion hole 20 in the casing body 17a, and the insertion hole 20 of the valve body 2 is formed by the casing body 17a having no insertion hole 20. Can be closed.
[0042]
【The invention's effect】
As described above, according to the first feature of the present invention, a butterfly throttle valve with a valve shaft is inserted into an insertion hole provided in one side wall of a valve body having an intake passage from its shaft end, An intake air amount control device for an engine, in which a valve is accommodated in an intake passage, a valve shaft is supported by a bearing hole formed in the valve body, and a lid for closing the insertion hole is joined to one side wall of the valve body. The first and second bearing holes for supporting both ends of the valve shaft are formed in the valve body, and the rotation axis passing through the center of rotation of the valve shaft is aligned with the center axis of the intake passage. arranged to offset to the side, also the throttle valve, in its fully closed position and arranged to axially offset the intake passage from the axis of the valve shaft, the insertion hole, the throttle bar Since the rotational direction toward the fully closed position the blanking from the fully open position to form a passage of the throttle valve with valve shaft capable to be so that when in the inserted position rotated approximately 90 ° in the opposite direction, Since the first and second bearing holes for supporting both ends of the valve shaft are provided in the valve body, it is easy to improve the coaxial accuracy of the valve body, and the valve shaft can be supported appropriately. Moreover, when the throttle valve is in the fully closed position, the valve and the insertion hole are separated in the axial direction of the intake passage, and the insertion hole does not straddle the throttle valve. through the throttle valve position can be reliably prevented from Ru through the, it is possible to precisely intake control during idling of the engine.
[0043]
According to a second aspect of the present invention, in addition to the first feature, since the said insertion holes be arranged on the upstream side of the intake passage from the throttle valve when in the fully closed position, the throttle valve In the fully closed state, the high intake negative pressure of the engine does not act on the insertion hole. Therefore, even if the insertion hole is blocked by the lid, the outside air is not sucked into the intake passage through the insertion hole. Can be prevented.
[0044]
Further, according to a third feature of the present invention, in addition to the first or second feature, a portion of the outer peripheral portion of the throttle valve that protrudes radially outward from the outer peripheral surface of the valve shaft, The throttle valve is in the fully closed position because it has been provided with a relief to avoid interference with the inner peripheral surface of the intake passage in the portion that moves radially outward of the intake passage when rotating from the fully closed position toward the fully open position. When the valve is opened, the outer peripheral portion that moves radially outward of the intake passage as the valve rotates can be prevented from interfering with the inner peripheral surface of the intake passage, and the throttle valve can be opened and closed smoothly. it is possible to I line to.
[0045]
Further according to the fourth aspect of the present invention, in addition to any of the first to third feature, the throttle valve with the valve shaft. Thus integrally molded with the same material, the throttle valves with axis By integrally forming the valve by injection molding, casting, or forging, the number of parts and the number of assembly steps can be reduced.
[0046]
According Furthermore to a fifth aspect of the present invention, in addition to the fourth feature, the throttle valve with valve shaft, the throttle arm to apply a rotational force thereto. Thus integrally molded with the same material The number of parts and the number of assembly steps can be further reduced by integrally forming the valve shaft and the throttle valve with the throttle arm by injection molding, casting, or forging.
[0047]
According to yet a sixth aspect of the present invention, in addition to the fourth feature, the throttle valve with the valve shaft. Thus integrally molded with synthetic resin, weight reduction of the throttle valve with valve shaft be able to.
[0048]
According to yet a seventh aspect of the present invention, in addition to the fifth feature, the valve shaft with a throttle valve and the throttle arm. Thus formed integrally with the synthetic resin, the valve shaft and with a throttle arm The weight of the throttle valve can be reduced.
[Brief description of the drawings]
FIG. 1 is a longitudinal side view of an intake air amount control apparatus for an engine according to a first embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along line 2-2 of FIG.
3 is a cross-sectional view taken along line 3-3 in FIG.
FIG. 4 is a perspective view of a throttle valve with a valve shaft in the intake air amount control device for the engine.
FIG. 5 is an explanatory diagram of an assembly procedure of the intake air amount control device for the engine, showing a state before insertion into the insertion hole of the throttle valve with a valve shaft.
6 is a view corresponding to FIG. 1 showing a state immediately after insertion of the throttle valve with a valve shaft into the insertion hole.
7 is a cross-sectional view taken along line 7-7 in FIG.
FIG. 8 is a sectional view corresponding to FIG. 3, showing a second embodiment of the present invention.
[9] cross-sectional view taken along line 9-9 of FIG. 8.
[Explanation of symbols]
X ... Center axis of intake passage Y ... Axis of rotation passing through the rotation center of the valve shaft 1 ... Intake air volume control device 2 ... Valve body 3 ... Intake passage 5 ... throttle valve 6 ... valve shaft 9 ... throttle arm 11 ... first bearing hole 12 ... second bearing hole 17 ... lid Body (casing)
20... Insertion hole
23 ... Escape

Claims (7)

A butterfly throttle valve (5) with a valve shaft (6) is inserted into the insertion hole (20) provided on one side wall of the valve body (2) having the intake passage (3) from its shaft end, and the throttle A lid (17) for accommodating the valve (5) in the intake passage (3), supporting the valve shaft (6) with a bearing hole formed in the valve body (2), and closing the insertion hole (20). Is an intake air amount control device for an engine, which is formed by joining a valve body (2) to one side wall,
First and second bearing holes (11, 12) for supporting both ends of the valve shaft (6) are formed in the valve body (2), and these bearing holes (11, 12) are connected to the valve shaft (6). The rotation axis (Y) passing through the center of rotation of the intake passage (3) is arranged so as to be offset to one side from the center axis (X) of the intake passage (3), and the throttle valve (5) is in the fully closed position (C) Arranged so as to be offset in the axial direction of the intake passage (3) from the rotation axis (Y) of the shaft (6), the insertion hole (20) and the throttle valve (5) are fully closed from the fully open position (O) position capable to so that the passage of the when the rotation direction towards the (C) at the insertion position is rotated approximately 90 ° in the opposite direction (I) a valve shaft (6) with a throttle valve (5) characterized in that formed in the intake amount control apparatus of the engine. The intake air amount control device for an engine according to claim 1,
The insertion hole (20), characterized in that disposed upstream of the throttle valve when in the fully closed position (C) (5) from the intake passage (3), the intake air amount control device for an engine. The engine intake air amount control device according to claim 1 or 2,
The outer peripheral portion of the throttle valve (5), a portion projecting radially outward from the outer peripheral surface of the valve shaft (6), the fully open position the throttle valve (5) from the fully closed position (C) (O) An engine having a relief (23) for avoiding interference with an inner peripheral surface of the intake passage (3) in a portion that moves radially outward of the intake passage (3) when rotating toward the engine, Intake air amount control device. The engine intake air amount control apparatus according to any one of claims 1 to 3,
An intake air amount control device for an engine, wherein the throttle valve (5) with the valve shaft (6) is integrally formed of the same material. The intake air amount control device for an engine according to claim 4,
Wherein the valve shaft (6) with a throttle valve (5), the throttle arm (9) to apply a rotational force thereto, characterized by being integrally molded with the same material, the intake air quantity control apparatus of the engine. The intake air amount control device for an engine according to claim 4,
The valve shaft (6) the throttle valve with (5), characterized by being integrally molded with synthetic resin, the intake air amount of the engine control device. The engine intake air amount control device according to claim 5,
The valve shaft (6) with a throttle valve (5) and the throttle arm (9), with a synthetic resin, characterized in that integrally molded, the intake air quantity control apparatus of the engine.

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