Internal-combustion engines – Engine speed regulator – Open loop condition responsive
Reexamination Certificate
2000-07-11
2001-12-04
Argenbright, Tony M. (Department: 3747)
Internal-combustion engines
Engine speed regulator
Open loop condition responsive
C123S337000, C029S890127
Reexamination Certificate
active
06325045
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a device for controlling an intake air quantity of a combustion engine, which controls the intake quantity in response to running conditions of a vehicle, and a method of producing the device.
2. Discussion of Background
A choke valve for a combustion engine of a vehicle is located in an intake passage of a throttle body, opened and closed in proportional to an amount of operating an accelerator, and operated upon, for example, detection of slipping by a difference between rotations of front wheels and rear wheels to control an output from the combustion engine by controlling an intake air quantity. Therefore, the choke valve is not directly connected to the accelerator by a linkage mechanism in order to open and close the choke valve. The choke valve is driven with a control of opening and closing positions by a motor and so on, and the opening and closing positions are determined by a composite signal including the signal concerning an amount of applying the accelerator.
FIG. 2
is a cross-sectional view of a part of a conventional intake quantity controlling device for a combustion engine. In
FIG. 2
, numerical reference
21
designates a housing of a throttle body, having an intake air controlling portion
23
, having a diameter the same as that of an intake air passage
22
for supplying an intake air to the combustion engine, and a motor accommodating portion
25
, both monolithically molded by same synthetic resins. Numerical reference
26
designates a valve shaft located in the intake air controlling portion
23
of the housing
21
, supported by a bearing
27
at both ends so as to be rotatable, penetrating through the intake air passage
22
, and having a choke valve
28
. The choke valve
28
rotates and moves from a completely closed position to a fully opened position of the intake air passage
22
upon rotation of the valve shaft
26
so as to control an intake air quantity. To one end of the valve shaft
26
, a decelerating mechanism driven by the motor
29
is coupled.
A stator
30
of the motor
29
is attached to the motor accommodating portion
25
of the housing
21
by inserting and molding. A rotator
32
has a driving shaft
31
. Both ends of the driving shaft
31
are supported by bearings
33
and
34
, located in the motor accommodating portion
25
of the housing. The driving shaft
31
is arranged in parallel with the valve shaft
26
and has a gear
31
a
at its tip.
Numerical reference
35
designates a decelerating gear comprising the decelerating mechanism. The decelerating gear decelerates rotation of the motor
29
in collaboration with other gears (not shown) to drive the valve shaft
26
. Numerical reference
36
designates a sensor located in the vicinity of the coupled portion of the decelerating mechanism to the valve shaft
26
. The sensor
36
detects a rotational angle of the valve shaft
26
in order to control a driving position of the motor
29
. Numerical reference
37
designates a connector, monolithically molded with the housing
21
and integrally grouped so as to be externally connected with the sensor
36
and the motor
29
. Numerical reference
38
designates a cover covering a driving portion of the valve shaft
26
between the valve shaft and the motor
29
.
Since the conventional intake air quantity controlling device is constructed as described above, when the housing is made of a resin, a size of the housing is changed by a physical volume change by a temperature change after molding. Further, because of a difference of a rate of dimensional change with respect to a flowing direction at time of molding, there is a problem that a high technique and a management are necessary to enable a production achieving required stable accuracies of an inner diameter of the intake air passage, pitches of the decelerating portion, and so on. Further, because a strength of a resin is generally smaller than a strength of a metal, there is a problem that a specific shape is necessary to reinforce the strength.
SUMMARY OF THE INVENTION
It is an object of the present invention to solve the above-mentioned problems inherent in the conventional technique and to provide an intake air quantity controlling device for a combustion engine, which has a high dimensional accuracy and a high strength.
According to a first aspect of the present invention, there is provided an intake air quantity controlling device for a combustion engine comprising:
a housing having an intake air passage of the combustion engine inside thereof;
a valve shaft, positioned in the intake air passage so as to be rotatable;
a choke valve, attached to the valve shaft and controlling an airflow rate through the intake air passage; and
a motor, fixed to the housing and driving the valve shaft through a decelerating mechanism,
wherein a supporting portion of a bearing for the valve shaft, an supporting portion for an intermediate gear shaft, and a reference hole for a rotor shaft of the motor are formed in a metallic plate.
According to a second aspect of the present invention, there is provided the intake air quantity controlling device for the combustion engine,
wherein the intake air passage, a motor accommodating portion, and a casing are monolithically molded.
According to a third aspect of the present invention, there is provided a method of producing the intake air quantity controlling device for the combustion engine,
wherein the reference hole of the rotor shaft, an inner diameter of a stator, and a penetrating hole through the plate are coaxially arranged by a metal mold for molding a resin.
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Suzuki Mikihiko
Tokiya Satoru
Argenbright Tony M.
Huynh Hai
Mitsubishi Denki & Kabushiki Kaisha
Sughrue Mion Zinn Macpeak & Seas, PLLC
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