KR20020090297A - Intake amount control apparatus for engine - Google Patents

Abstract

PURPOSE: To provide an intake air amount control device for an engine in which the processing of a throttle body and the production of an assembly comprising an idle air control valve, an actuator and a throttle sensor can concurrently be performed to contribute to the improvement of productivity. CONSTITUTION: A synthetic resin-made casing 10 is attached to a throttle body 1 as a separate body in one end side of a valve shaft 4 of a throttle valve 3. Further, the idle air control valve 25, the actuator 26 and the throttle sensor 37 are installed in the casing 10.

Description

Intake air volume control device for engines {INTAKE AMOUNT CONTROL APPARATUS FOR ENGINE}

The present invention provides a throttle body provided with a throttle valve in an intake pipe connected to an intake port of an engine, a bypass conduit connected to the intake pipe by bypassing the throttle valve, and idle air controlling the opening degree of the bypass conduit in the fully closed state of the throttle valve. The invention relates to an improvement of an intake air volume control device for an engine including a control valve, an actuator for driving the opening and closing of the idle air control valve, and a throttle sensor for inspecting the opening degree of the throttle valve.

Such an intake air amount control device for engines is already known, for example, as disclosed in Japanese Unexamined Patent Publication No. 3-122246.

Conventionally, in such an engine intake air amount control apparatus, since a housing is integrally molded to a throttle body and an idle air control valve, an actuator, and a throttle sensor are disposed in the housing, the idle air control is performed after processing the throttle body with the housing. Since a valve, an actuator, and a throttle sensor must be attached, it is difficult to say that productivity is good.

This invention is made | formed in view of such a situation, The engine intake amount control apparatus which can perform the processing of a throttle body and manufacture of an assembly of an idle air control valve, an actuator, and a throttle sensor can contribute to the improvement of productivity. The purpose is to provide.

In order to achieve the above object, the present invention provides a throttle body provided with a throttle valve on an intake pipe connected to an intake port of an engine, a bypass conduit connected to an intake pipe by bypassing a throttle valve, and a bypass conduit in a completely closed state of a throttle valve. An intake air volume control device for an engine having an idle air control valve for controlling the opening degree, an actuator for driving the opening and closing of the idle air control valve, and a throttle sensor for inspecting the opening degree of the throttle valve, the valve of the throttle valve A first feature is that a separate casing is attached to the throttle body at one end of the shaft, and the idle air control valve, the actuator, and the throttle sensor are disposed on the casing.

According to this first feature, it is possible to perform the processing of the throttle body and the assembly of the casing and the sensors in parallel, and the productivity can be greatly improved.

In addition to the first aspect of the present invention, the throttle body and the casing include a bypass conduit upstream groove connected to an upstream side of the intake pipe as a part of the bypass conduit and a bypass conduit downstream groove connected to a downstream side of the same intake pipe. It is a 2nd characteristic that it formed in at least one of the engagement surfaces of the.

According to this second feature, when the bypass conduit upstream groove and the bypass conduit downstream groove are molded into at least one of the throttle body and the casing, they can be formed simultaneously, and the productivity can be further increased.

In addition, the present invention is characterized in that, in addition to the first or the second feature, the position of the substrate of the electronic control apparatus is determined and fixed to the casing, and the actuator and the throttle sensor are connected to the substrate.

According to this third aspect, the actuator, the throttle sensor, and the electronic control device are integrated, and the assemblability can be improved, and the connecting portions thereof can be reliably protected by the casing.

In addition, the present invention is characterized in that the casing is made of a synthetic resin in addition to any one of the first to third features.

According to this fourth feature, the casing made of synthetic resin is excellent in heat insulation, whereby the idle air control valve, actuator and throttle sensor can be protected from heat of the engine.

In addition, the present invention is characterized by arranging the idle air control valve and the actuator in parallel with the intake pipe in addition to any one of the first to fourth features.

According to this fifth feature, the idle air control valve and the actuator are disposed along the intake pipe, and the amount of protrusion to the outside of the throttle body is suppressed, so that the compaction of the entire housing and further the intake air amount control device can be effectively achieved. .

The present invention also provides, in addition to the second aspect, a valve chamber for receiving the idle air control valve as part of the bypass conduit and a valve hole opened and closed by the idle air control valve, the bypass conduit upstream groove and the bypass conduit downstream groove. The sixth feature is that each of the upper ends is connected to.

According to this sixth feature, even if foreign matter such as dust enters the bypass conduit upstream groove and the bypass conduit downstream groove from the intake pipe, it does not rise to the valve chamber and the valve hole, thereby preventing the accumulation of foreign substances in the valve chamber and the valve hole. can do.

1 is a vertical plan view of an intake air amount control device for an engine according to the present invention;

2 is a view seen from the direction of the arrow 2 of FIG.

3 is a cross-sectional view taken along line 3-3 of FIG. 1;

4 is an enlarged cross-sectional view taken along line 4-4 of FIG. 3;

FIG. 5 is an enlarged cross-sectional view taken along line 5-5 of FIG. 2.

<Description of the symbols for the main parts of the drawings>

1: throttle body

2: intake pipe

3: throttle valve

4: valve shaft

10: casing

13: bypass conduit

16: bypass conduit upstream home

17: bypass conduit downstream groove

20: valve chamber

21: valve hole

25: Idle Air Control Valve

26: actuator

37: throttle sensor

40: electronic control unit

40a: substrate

EMBODIMENT OF THE INVENTION Embodiment of this invention is described below based on one Example of this invention shown in an accompanying drawing.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a longitudinal plan view of an intake air amount control apparatus for an engine according to the present invention, Fig. 2 is a view seen from the direction of 2 arrows in Fig. 1, Fig. 3 is a cutaway view taken along line 3-3 of Fig. 3 is an enlarged cross-sectional view taken along line 4-4, and FIG. 5 is an enlarged cross-sectional view taken along line 5-5 in FIG.

First, in FIGS. 1 to 3, the throttle body 1 has a horizontal intake pipe 2 connected to an intake port of an engine (not shown) as in the prior art, and opens and closes the intake pipe 2. The valve shaft 4 of the throttle valve 3 is rotatably supported on both the left and right side walls of the throttle body 1, and its bearing hole seals the seal members 5, 5 ′ closely to the outer circumferential surface of the valve shaft 4. Is fitted. A throttle drum 6 is mounted at one end of the valve shaft 4 protruding to one side of the throttle body 1, and a return spring for applying a force to the operation wire 7 and the throttle valve 3 in the closing direction ( 8) is connected, and the throttle valve 3 can be opened by pulling the operation wire 7 by the operation member which is not shown in figure.

A connecting flange 1a is integrally formed on the outer wall of the throttle body 1 from which the tip of the valve shaft 4 protrudes, and a casing made of synthetic resin molded separately from the throttle body 1 on the connecting flange 1a. The bottom wall of 10 is joined by a plurality of bolts 11. The casing 10 has a box shape with an outer side open, and a support block 12 made of synthetic resin is housed therein uniformly. A bypass conduit 13 is formed which passes through the throttle body 1, the casing 10 and the support block 12 and bypasses the throttle valve 3 and is connected to the intake pipe 2.

As shown in FIGS. 2 to 5, the bypass conduit 13 communicates with the joint surface of the connecting flange 1a upstream from the throttle valve 3 of the intake pipe 2. Bypass conduit inlet hole 14 perforated and bypass conduit outlet perforated in the throttle body 1 communicating with the joint surface of the connecting flange 1a downstream from the throttle valve 3 of the intake pipe 2. On the joining surface of the connection flange 1a and the bypass conduit upstream groove 16 formed at the joining surface of the hole 15 and the connecting flange 1a and connected at one end thereof to the bypass conduit inlet hole 14. A bypass conduit downstream groove 17 formed at one side thereof and connected to the bypass conduit outlet hole 15 and through the bottom wall of the casing 10 to the support block 12 to form a bypass conduit upstream groove 16. It is formed in the support block 12 through the valve chamber introduction hole 18 and the bottom wall of the casing 10 connected to the other end of the right side, The valve chamber 20 formed in the valve chamber lead-out hole 19 connected to the other end of the conduit downstream groove 17, the support block 12 which communicates with the valve chamber introduction hole 18, and this valve chamber ( 20 is comprised of the valve hole 21 formed in the same support block 12 which communicates with the valve chamber lead-out hole 19. As shown in FIG. At that time, the bypass conduit upstream groove 16 and the bypass conduit downstream groove 17 are arranged in a H shape with the inlet hole 14 and the outlet hole 15 side downward in FIG. The introduction hole 18 and the valve chamber lead-out hole 19 are arranged in close proximity to each other and at the same time above the inlet hole 14 and the outlet hole 15. Moreover, the valve chamber 20 and the valve hole 21 which communicate with the valve chamber introduction hole 18 and the valve chamber lead-out hole 19, respectively, are arranged in parallel with the intake pipe 2. And a sealing member 22 which surrounds the bypass conduit upstream groove 16 and the bypass conduit downstream groove 17 and the first and second inspection holes 33 and 34 which will be described later are connected to the flange 1a and the casing ( It is interposed between the joining surfaces of 10).

As shown in FIG. 5, an idle air control valve 25 for opening and closing the valve hole 21 is disposed in the valve chamber 20, and an electric actuator 26 for driving the opening and closing of the valve 25 is supported. Mounted on block 12. At that time, the idle air control valve 25 and the actuator 26 are also arranged in parallel with the intake pipe 2.

The guide cylinder 27 is fixedly installed on the mounting base 26a of the actuator 26, and the screw shaft connected to the rotor of the actuator 26 is connected to the actuating piston 28 so that only the sliding movement is possible. 29) are screwed together. The idle air control valve 25 has a guide hole 25a having a bottom in the rear end face, and the guide cylinder 27 is fitted into the guide hole 25a, and at the bottom of the guide hole 25a, an actuating piston ( 28) The tip is attached.

In the valve chamber 20, the valve spring 30 which applies the idle air control valve 25 to the opening direction of the valve hole 21 is reduced, and the source of the guide cylinder 27 and the idle air control valve are provided. The dustproof booth 31 is provided long between the 25. Usually, the inspection window 42 of the actuator 26 in which the cap 43 is formed is provided on one side wall of the casing 10.

In FIG. 1 again, moving to the throttle body 1, the casing 10, and the support block 12, the first inspection hole 33 which opens the upstream side of the intake pipe 2 and the same downstream side is opened. The second inspection hole 34 is provided, the intake air temperature sensor 35 which inspects the temperature in the intake pipe 2 through the first inspection hole 33, and the second inspection hole 34 A booster pressure sensor 36 for checking the booster pressure is mounted to the support block 12. In addition, the support block 12 is equipped with a throttle sensor 37 for inspecting the opening degree of the throttle valve 3. The throttle sensor 37 is connected to an end of the valve shaft 4 intruded into the casing 10, and rotates integrally with the rotor 37a and a throttle of the rotation angle of the rotor 37a. A stator 37b for inspecting the opening degree of the valve 3, the rotor 37a being rotatably supported by the support block 12, and at the same time the return spring 38 of the throttle valve 3 Force is applied in the closing direction, and the stator 37b is fixed to the support block 12.

The substrate 40a of the electronic control device 40 is fitted to the opening of the casing 10 by pressing the support block 12 against the bottom wall side of the casing 10, and the intake air temperature is applied to the substrate 40a. The terminals of the sensor 35, the booster pressure sensor 36, the throttle sensor 37, and the actuator 26 are connected. A coupler 44 (see FIG. 2) connecting to the electronic control device 40 is formed on one side of the casing 10. The coupler 44 faces the connection port downward, and rainwater or the like is difficult to invade. The opening of the casing 10 is filled with a synthetic resin 41 covering the electronic controller 40.

Next, the operation of this embodiment will be described.

When the throttle valve 3 is completely closed, the electronic control device 40 starts the engine on the basis of a test signal input from the throttle sensor 37, the intake air temperature sensor 35, the booster pressure sensor 36, and the like. It is necessary to determine the operating conditions of the engine during idling, usually idling, engine braking, etc., and to obtain the opening degree of the idle air control valve 25 correspondingly, and operate the actuator 26 to operate the screw shaft 29. Rotate forward or reverse. When the screw shaft 29 rotates forward or reverse, the actuating piston 28 cooperates with the valve spring 30 while moving forward and backward, moving the idle air control valve 25 forward and backward, and thereby opening the valve hole 21. The opening area of the gas is controlled, and thus the intake air flow rate in the bypass conduit 13 is controlled. As a result, engine start, fast idling and normal idling are automatically performed appropriately.

By opening the throttle valve 3, the intake air amount corresponding to the opening degree can be supplied to the engine through the intake pipe 2, and the engine can be accelerated.

By the way, in such an engine intake amount control apparatus, a separate casing 10 is bolted to a connecting flange 1a formed on one side of the throttle body 1, and the idle air control valve 25 is attached to the casing 10. ), The support block 12 equipped with the actuator 26, the intake air temperature sensor 35, the booster pressure sensor 36, and the throttle sensor 37 is accommodated and fixed, so that the processing of the throttle body 1, The casing 10, the support block 12, and the assembly of the sensors can be manufactured in parallel, which can greatly contribute to the improvement of the productivity.

In addition, since the bypass conduit upstream groove 16 and the bypass conduit downstream groove 17 constituting a part of the bypass conduit 13 are formed in the joining surface of the connecting flange 1a joined with the bottom wall of the casing 10, These bypass conduit grooves 16 and 17 can be formed at the same time when forming the connection flange 1a, and further the productivity can be improved.

In addition, the casing 10 is fixed by determining the position of the substrate 40a of the electronic control apparatus 40, and the actuator 26, the intake air temperature sensor 35, the booster pressure sensor 36, and the substrate 40a are fixed to the substrate 40a. Since the throttle sensor 37 is connected, the actuator 26, the intake air temperature sensor 35, the booster pressure sensor 36, the throttle sensor 37, and the electronic control device 40 are integrated, and the assembly performance is improved. At the same time, these connecting portions can be reliably protected by the casing 10.

Moreover, since the casing 10 and the support block 12 are made of synthetic resin, they are excellent in heat insulation and can protect the idle air control valve 25 and sensors from the heat of an engine.

In addition, since the idle air control valve 25 and the actuator 26 are arranged in parallel with the intake pipe 2 of the throttle body 1, the idle air control valve 25 and the actuator 26 are connected to the intake pipe 2. It is arrange | positioned along this, and it can suppress the protrusion amount to the outer side of these connection flange 1a little, and can compact the casing 10 and further the whole intake air amount control apparatus effectively.

Also, in the bypass conduit 13, the valve chamber 20 and the valve hole 21 lead to the valve chamber introduction hole 18 and the valve chamber at the upper ends of the bypass conduit upstream groove 16 and the bypass conduit downstream groove 17. Since each connection is made through the hole 19, even if foreign matter such as dust enters the valve chamber introduction hole 18 or the valve chamber lead-out hole 19 from the intake pipe 2, it is connected to the valve chamber 20 and the valve hole. Since it does not rise to (21), the deposit of the foreign material in the valve chamber 20 and the valve hole 21 can be prevented.

The present invention is not limited to the above embodiments, and various design changes are possible without departing from the gist of the present invention. For example, the bypass conduit upstream groove 16 and the bypass conduit downstream groove 17 may be formed on the joining surface side with the connecting flange 1a of the casing 10. The support block 12 can be molded integrally with the casing 10.

As described above, according to the first aspect of the present invention, a throttle body provided with a throttle valve in an intake pipe connected to an intake port of an engine, a bypass conduit connected to the intake pipe by bypassing the throttle valve, and bypassed in a completely closed state of the throttle valve An intake air volume control device for an engine having an idle air control valve for controlling the opening degree of a conduit, an actuator for driving the opening and closing of the idle air control valve, and a throttle sensor for inspecting the opening degree of the throttle valve, wherein the throttle valve Since a separate casing was attached to the throttle body at one end of the valve shaft and the idle air control valve, the actuator, and the throttle sensor were disposed on the casing, the processing of the throttle body and the manufacture of the casing and the sensor assembly were performed in parallel. It is possible to carry out by doing so, and the productivity can be greatly improved.

According to a second aspect of the present invention, there is provided a bypass conduit upstream groove connected to an upstream side of the intake pipe as part of the bypass conduit and a bypass conduit downstream groove connected to a downstream side of the same intake pipe of the throttle body and the casing. Since it is formed in at least one of the engaging surfaces, when forming the bypass conduit upstream groove and the bypass conduit downstream groove in at least one of the throttle body and the casing, it can also be formed simultaneously, and can further improve the productivity.

According to the third aspect of the present invention, since the position of the substrate of the electronic controller is fixed to the casing and the actuator and the throttle sensor are connected to the substrate, the actuator, the throttle sensor, and the electronic controller are integrated. In addition, the assembly performance can be improved, and these connecting portions can be reliably protected by a casing.

Further, according to the fourth aspect of the present invention, since the casing is made of synthetic resin, the casing made of synthetic resin has excellent heat insulation, thereby protecting the idle air control valve, the actuator, and the throttle sensor from the heat of the engine. have.

According to a fifth aspect of the present invention, since the idle air control valve and the actuator are arranged in parallel with the intake pipe, the idle air control valve and the actuator are arranged along the intake pipe, and these protrude out of the throttle body. A small amount can be suppressed, and the compaction of the housing and further the intake air amount control device can be effectively achieved.

According to a sixth aspect of the present invention, there is provided a valve chamber for accommodating the idle air control valve as part of the bypass conduit and a valve hole opened and closed by the idle air control valve, and the upper end of the bypass conduit upstream groove and the bypass conduit downstream groove. Since foreign matters such as dust enter the bypass conduit upstream groove and the bypass conduit downstream groove from the intake pipe, they do not rise to the valve chamber and the valve hole, thereby preventing the accumulation of foreign substances in the valve chamber and the valve hole. have.

Claims (6)

By-pass conduit 13 and throttle valve connected to the intake pipe 2 by bypassing the throttle body 1 with the throttle valve 3 installed in the intake pipe 2 connected to the intake port of the engine, and the throttle valve 3 An idle air control valve 25 for controlling the opening degree of the bypass conduit 13 in the fully closed state of (3), an actuator 26 and an throttle valve 3 for driving opening and closing of the idle air control valve 25. In the intake air amount control apparatus for an engine provided with the throttle sensor 37 which examines the opening degree of the A separate casing 10 is attached to the throttle body 1 at one end of the valve shaft 4 of the throttle valve 3 so that the idle air control valve 25 and the actuator ( 26) and an intake air amount control device for an engine, characterized by disposing a throttle sensor (37). The method of claim 1, As part of the bypass conduit 13, a bypass conduit upstream groove 16 connected to an upstream side of the intake pipe 2 and a bypass conduit downstream groove 17 connected to a downstream side of the same intake pipe 2 are provided. The intake air amount control device for an engine, characterized in that formed on at least one of the engaging surface of the throttle body (1) and the casing (10). The method according to claim 1 or 2, An engine characterized in that the position of the substrate 40a of the electronic control device 40 is fixed to the casing 10 and the actuator 26 and the throttle sensor 37 are connected to the substrate 40a. Intake air volume control device. The method according to any one of claims 1 to 3, The intake air amount control device for an engine, characterized in that the casing (10) is made of synthetic resin. The method according to any one of claims 1 to 4, The idle air control valve (25) and the actuator (26) are arranged in parallel with the intake pipe (2). The method of claim 2, As part of the bypass conduit 13, a valve chamber 21 for accommodating the idle air control valve 25 and a valve hole 21 opened and closed by the idle air control valve 25 are provided in the bypass conduit upstream groove ( 16) and an intake air amount control device for an engine, which is connected to upper ends of the bypass conduit downstream grooves 17, respectively.