Valves and valve actuation – Mechanical movement actuator – Gear
Reexamination Certificate
1999-10-25
2002-04-02
Derakshani, Philippe (Department: 3754)
Valves and valve actuation
Mechanical movement actuator
Gear
C251S250000
Reexamination Certificate
active
06364284
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a throttle valve control device for an internal combustion engine for transmitting rotation of a motor depending on an input of an accelerator pedal to a valve shaft of a throttle valve for adjusting amount of intake air to an internal combustion engine through a gear train unit consisting of a sun gear, a ring gear of an inner teeth type and planetary gear mating to foregoing gears.
2. Description of the Prior Art
FIG. 16
to
FIG. 19
illustrate prior arts which have been filed by the present applicant but not yet been laid open to public:
FIG. 16
is a side view partially cut away the throttle valve device for an internal combustion engine,
FIG. 17
is a sectional view of
FIG. 16
along line D—D,
FIG. 18
is a front view of the valve housing and
FIG. 19
is a front view of the ring gear. In
FIG. 16
,
1
is an internal combustion engine,
2
is a throttle valve,
3
is a valve housing of the throttle valve
2
,
5
is a valve shaft being rotably provided in the value housing
3
a crossing an intake air passage
4
,
6
is a valve body attached to the valve shaft
5
,
7
is a intake pipe such as a manifold to connect the intake air passage
4
to unshown intake air hole,
8
is a motor such as DC brushless motor arranged with abutment to the throttle valve
2
,
9
is a motor housing of the motor
8
,
10
is a stator stored in the motor housing
9
,
11
is a rotor being a counterpart of the stator
10
,
12
is a out put shaft to which the rotor
11
is attached,
13
is a bearing rotatably supporting one end of the output shaft
9
at the motor housing
9
, and
14
is a terminal which is connected to the coil of the stator
10
and assembled into the motor housing
9
. According to arrangement of the motor
8
and the throttle valve
2
with mutual abutment thereof, rotation center of the output shaft
12
and that of the valve shaft are placed coaxially on a single straight line as shown by a chain with a single dot line and the other end of the output shaft
12
and an end of the valve shaft
5
are placed facing mutually with a gap, and the end face of the opening of the motor housing
9
formed annularly along periphery on the other side of the output shaft
12
and the end face of the opening of the valve housing
3
formed annularly along periphery of one side of the valve housing
3
are arranged to be butt jointed; in this arrangement with mutual abutment of the throttle value
2
and the motor
8
, a gear train unit
16
is assembled into an inner space
15
which is hermetically sealed by the valve housing
3
and the motor housing
9
; the gear train unit
16
consists of a sun gear
17
, a ring gear of inner teeth type and a planetary gear
19
mating with foregoing gears; the sun gear
17
is arranged to rotate together with the output shaft
12
of the motor
8
and the rotation center of the sun gear and that of the value shaft
5
are arranged coaxially facing each other; the ring gear
18
is provided with a center body
181
having a rigidity, a teeth portion
182
made of a synthetic resin being die molded with respect to the center body
181
and rotation detent portions
183
made of a synthetic resin die molded with respect to the center body those of which are integrated to a single body; the teeth portion
182
of the ring gear
18
is arranged coaxially with and around the sun gear
17
, and the center hole portion
184
of the ring gear
18
is arranged coaxially with and rotatably to the output shaft
12
through the bearing
20
; the peripheral surface of the ring gear
18
on the side of the teeth portion
182
contacts with the inner peripheral surface of the value housing
3
and that of the motor housing
9
those of which form the inner space, and the ring gear
18
is fixed to the valve housing
3
and the motor housing
9
; the rotation center of the planetary gear
19
is coupled to the supporting member
21
fixed to an end of the valve shaft
5
so as to be rotatable together with the valve shaft
5
through the supporting rod
22
; in this way, after the gear train unit
16
is assembled into the inner space
15
, the valve housing
3
and the motor housing
9
are mutually connected by means of unshown securing means such as a bolt;
23
is a spring such that the valve body
6
exerts a force on supporting member
21
for bringing back the intake air passage to the position of an intermediate opening;
24
is a control unit for supplying electric power to the terminal
14
of the motor
2
,
25
is a accelerator pedal, and
26
is accelerator sensor for outputting electrical signal obtained through conversion of detection value of the input of the accelerator pedal
25
to the control unit
24
.
Description is subsequently given of the operation of the throttle value control unit. When the accelerator pedal
25
is operated, the accelerator sensor
26
detecting the input of the accelerator pedal outputs an electric signal to the control unit
24
and the control unit
24
supplies an electric power corresponding to the electric signal from the accelerator sensor to the terminal
14
of the motor
8
; the stator
10
produces a rotating magnetic field depending on the electric current flowing through the coil of the stator
10
; the output shaft
12
rotates due to the attraction and repulsion caused by the rotating magnetic field produced by the stator
10
and the magnetic field in possession of the rotor
11
, and in turn the sun gear
17
rotates together with the output shaft
12
; and then the planetary gear
19
performs a revolution centering on the sun gear
17
and a rotation centering on the supporting rod
22
; and by virtue of the revolution of the planetary gear the valve shaft
5
rotates through the supporting rod
21
, and by the rotation of the valve body
6
, sectional area of the intake air passage is adjusted. Thus, the gear train unit
16
consisting of the sun gear
17
, the ring gear
18
and the planetary gear
19
transmit the rotation of the motor
2
depending on the input of the accelerator pedal
25
to the valve shaft
5
of the valve
2
for adjusting the amount of intake air to the internal combustion engine
1
through the supporting member
21
.
In
FIG. 17
, the ring gear
18
comprises a plurality of rotation detent portions
183
and yet these detent portions
183
are provided by a number which is required in order to satisfy the strength at an arbitrary positions and are stored in the valve housing
3
with engagement to the valve housing and thereby preventing the ring gear
18
from rotation along peripheral direction. In
FIG. 18
, the valve housing
3
is formed of groove shaped engagement portions
3
a
on the inner peripheral surface which forms the inner space
15
as shown by FIG.
16
and these engagement portions
3
a
are arranged at three positions of P
11
~P
13
out of four positions of P
11
~P
14
which are intersecting points of the inner peripheral surface with two straight lines of L
12
and L
13
which intersect perpendicularly; the valve housing is provided with, outwardly from the center and concentric circularly, a through hole
36
for valve shaft, a recessed portion
3
c
for receiving the bearing, a spring guide positioning portion
3
d,
and a recessed portion
3
e
for reception of the spring; outside the recessed portion
3
e
for reception of spring, a supporting member clearance groove
3
f
and a spring guide stopper clearance groove
3
g
are arranged; on outer peripheral surface of the valve housing
3
, an air hole
3
h
penetrating between outside and inside thereof is provided; when the unit consisting of the throttle valve
2
and the motor
8
is installed to an internal combustion engine
1
, the air hole
3
h
is directed toward ground and thus water collected by dew condensation in the inner space
15
is drained out through the air hole
3
h.
In
FIG. 19
, a plurality of rotation detent portions
183
project to outside along radial directions from the oute
Imada Kensuke
Sugiyama Takeshi
Suzuki Mikihiko
Bonderer D. Austin
Derakshani Philippe
Mitsubishi Denki & Kabushiki Kaisha
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