BACKGROUND OF THE INVENTION
FIELD OF THE INVENTION
[0001] The present invention relates to an engine intake system with the features of the
preamble part of claim 1.
DESCRIPTION OF THE RELATED ART
[0002] Document
JP 205 118718 A discloses an engine intake system of the generic kind. In the following, further
reference to prior art is made:
[0003] Document
JP 09303164 A describes an intake device for an engine comprising a throttle body including an
intake path, a throttle valve, a bypass bypassing the throttle valve, a bypass air
flow control valve and a throttle sensor detecting a throttle valve opening.
[0004] An engine intake system comprising: a throttle body including an intake path and
a shaft-receiving hole formed therein; a throttle valve supported at a valve shaft
thereof in the shaft-receiving hole so as to open and close the intake path; a bypass
bypassing the throttle valve and connected to the intake path; a bypass valve for
regulating an opening degree of the bypass; an actuator for actuating the bypass valve;
and a throttle sensor attached to a sidewall of the throttle body and detecting an
opening degree of the throttle valve is already known as disclosed in
Japanese Patent Application Laid-Open No. 2003-74444.
[0005] In such a conventional engine intake system, a bypass valve for regulating an opening
degree of a bypass and an actuator for the bypass valve are attached to a control
block bonded to a throttle body. Therefore, it is possible to perform in parallel
the assembling of the throttle body side and the assembling of the control block side.
Also, the bypass valve provided in the control block is inevitably positioned far
away from an outlet port of the bypass which is open in a downstream side of an intake
path. Therefore, the conventional system has an advantage that it is difficult for
engine blowback to reach the bypass valve.
[0006] However, because the throttle body with the control block connected thereto tends
to be large as a whole, the conventional system is not suitable for such a case of
a motorcycle where a throttle body is placed in a small space around an engine.
SUMMARY OF THE INVENTION
[0007] The present invention has been achieved in view of the above circumstances, and has
an object to provide an engine intake system which is small, in which it is difficult
for engine blowback to reach a bypass valve, and a valve hole for fittingly receiving
therein the bypass valve can be easily machined, and which has an excellent productivity.
[0008] In order to achieve the above object, according to a first feature of the present
invention, there is provided an engine intake system with the features of claim 1.
[0009] With the first feature of the present invention, the bypass valve is fittingly attached
in the valve hole formed in the throttle body, and also the actuator for actuating
the bypass valve is attached to the throttle body. Therefore, the throttle body with
the bypass valve and the actuator can be downsized as a whole, and thus even in such
a case of a motorcycle where a space around an engine is small, the throttle body
can be easily placed therein.
[0010] Further, the valve hole for fittingly receiving therein the bypass valve is arranged
on a side opposite from the outlet port with the throttle valve interposed therebetween,
and thus a distance between the valve hole and the outlet port is secured to be large
while arranging the valve hole at a high position. Therefore, even if the engine blowback
enters the outlet port, the engine blowback does not easily reach the valve hole,
thereby preventing moisture and carbon contained in the blowback gas from being frozen
and adhering to prevent the bypass valve from being fixed to a position.
[0011] Furthermore, the valve hole is positioned parallel with the shaft-receiving hole
for supporting the shaft of the throttle valve, and thus the valve hole can be machined
at a time together with the shaft-receiving hole, by a multi-shaft drilling machine,
thereby improving the productivity.
[0012] Furthermore, because the valve hole is arranged above the axis of the intake path
and the outlet port is arranged below the axis of the intake path, a distance in the
vertical direction between the valve hole and the outlet port is further sufficiently
secured, thereby effectively preventing the engine blowback from reaching the valve
hole. Also, because the outlet hole is arranged parallel with the shaft-receiving
hole as in the case of the valve hole, also the outlet port can be machined at a time
together with the valve hole and the shaft-receiving hole, by a multi-shaft drilling
machine, thereby further improving the productivity.
[0013] According to a second feature of the present invention, in addition to the first
feature, the inlet port is arranged so as to be open at an upper portion of an upstream-side
end-surface of the throttle body.
[0014] With the second feature of the present invention, the inlet port is open at the upper
portion of the upstream-side end-surface of the throttle body to directly face the
intake air flow, and thus the inlet port can smoothly receive thereinto the intake
air, thereby contributing to stabilization of idling of the engine.
[0015] According to a third feature of the present invention, in addition to any of the
first to second features, the actuator and a sensor box which holds the throttle sensor
are attached to end surfaces of the throttle body, the end faces facing the same direction.
[0016] With the third feature of the present invention, the sensor box and the actuator
can be easily attached from the same direction to the throttle body without turning
the throttle body, thereby improving the productivity.
[0017] The above-mentioned object, other objects, characteristics, and advantages of the
present invention will become apparent from a preferred embodiment which will be described
in detail below by reference to the attached drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0018]
FIG. 1 is a plan view of an engine intake system according to an embodiment of the
present invention.
FIG. 2 is a sectional view taken along a line 2-2 of FIG. 1.
FIG. 3 is a sectional view taken along a line 3-3 of FIG. 2.
FIG. 4 is a view taken in a direction of an arrow 4 in FIG. 1.
FIG. 5 is a sectional view taken along a line 5-5 of FIG. 4.
FIG. 6 is a sectional view taken along a line 6-6 of FIG. 1.
FIG. 7 is a sectional view taken along a line 7-7 of FIG. 6.
DESCRIPTION OF THE PREFERRED EMBODIMENT
[0019] First, FIGS. 1 to 4 show an intake system of the present invention which is mainly
used for an engine of a two-wheeled motor vehicle. The intake system includes a throttle
body 1 to be mounted on the engine. The throttle body 1 has an intake path 2 horizontally
connected to an intake port (not shown) of the engine in a state in which the throttle
body 1 is mounted on the engine. The throttle body 1 has first and second shaft-receiving
bosses 3 and 4 formed on its sidewalls which are horizontally opposed to each other
so that the bosses 3 and 4 project outward from the sidewalls, respectively. A valve
shaft 7a of a butterfly-type throttle valve 7 for opening and closing the intake path
2 is rotatably supported in horizontal shaft-receiving holes 5 and 6 which are provided
coaxially with the shaft-receiving bosses 3 and 4. A throttle drum 8 is fixedly attached
to one end of the valve shaft 7a projecting outward from the first shaft-receiving
boss 3. A return spring 9 for biasing the throttle drum 8 in a closing direction of
the throttle valve 7 is mounted on the first shaft-receiving boss 3.
[0020] A sensor box 10 integrally including a coupler 14 is fixedly attached on an end surface
of the second shaft-receiving boss 4 by a plurality of screws 35. The sensor box 10
supports therein a throttle sensor 11, an intake-air temperature sensor 12, a boost
negative-pressure sensor 13 and other components. The throttle sensor 11 detects a
turning angle of the valve shaft 7a as an opening degree of the throttle valve 7.
The intake-air temperature sensor 12 passes through a through hole 33 in the sidewall
of the throttle body 1 to cause its tip end to face the intake path 2, and detects
a temperature of intake air. The boost negative-pressure sensor 13 detects a boost
negative-pressure of the engine through a detection hole 34 (see FIG. 7) open in the
intake path 2 at a position downstream of the throttle valve 7.
[0021] The throttle body 1 is provided with a bypass 15 which bypasses the throttle valve
7 and is connected to the intake path 2. The bypass 15 comprises: an inlet port 15a
(see FIG. 4) open in an upper part of an upstream-side end-surface of the throttle
body 1, and extending along the intake path 2; a cylindrical valve hole 15b (see FIG.
5) rising from a downstream end of the inlet port 15a; a fixed measuring hole 15c
(see FIG. 5) having a diameter smaller than that of the valve hole 15b, orthogonal
to an intermediate part of the valve hole 15b, and extending along the intake path
2; a lateral hole 15d rising from a downstream end of the fixed measuring hole 15c
and open in the end surface of the second shaft-receiving boss 4; a groove-shaped
intermediate curved path 15e (see FIG. 6) formed between joint surfaces of the second
shaft-receiving boss 4 and the sensor box 10, and leading to the lateral hole 15d;
and an outlet port 15f (see FIGS. 2 and 3) communicating with the downstream end of
the intermediate curved path 15e, and open in the intake path 2 at a position downstream
of the throttle valve 7.
[0022] As shown in FIGS. 2 and 5, the valve hole 15b and the fixed measuring hole 15c are
formed by drilling in a valve body portion 16 which is integrally formed in the throttle
body 1 and adjacent to the second shaft-receiving boss 4. Specifically, the valve
hole 15b is bored by drilling from a first end surface 16a of the valve body portion
16 which is parallel with the end surface of the second shaft-receiving boss 4 such
that the valve hole 15b is parallel with the shaft-receiving holes 5 and 6; and the
fixed measuring hole 15c is bored by drilling from a second end surface 16b which
is parallel with the upstream-side end-surface of the second shaft-receiving boss
4 such that the fixed measuring hole 15c extends across the valve hole 15b. When machining
the fixed measuring hole 15c, a machining hole 17 is formed in the second end surface
16a of the valve body portion 16 so as to be coaxial with the fixed measuring hole
15c. The machining hole 17 is airtightly closed by a plug 18 which is press-fitted
or screwed into the machining hole 17. In this way, the first and second shaft-receiving
holes 5 and 6, and the valve hole 15b which are parallel with one another are machined
at a time by a multi-shaft drilling machine.
[0023] The valve hole 15b is arranged close to the second end surface 16b so that a length
L1 of the machining hole 17 becomes sufficiently smaller than a length L2 of the fixed
measuring hole 15c. With this arrangement, an amount of machining for the machining
hole 17 is minimized to extend the durable life of the drill.
[0024] As shown in FIG. 2, the valve hole 15b is arranged on the side opposite from the
outlet port 15f of the bypass 15 with the throttle valve 7 interposed therebetween,
and at a position above the axis A of the intake path 2. The outlet port 15f is arranged
below the axis A of the intake path 2. In this structure, both the valve hole 15b
and the outlet port 15f are arranged in parallel with the first and second bearing
holes 5 and 6.
[0025] Referring again to FIG. 5, a hollow cylindrical bypass valve 20 is slidably fitted
into the valve hole 15b. The bypass valve 20 has, on its sidewall, a movable measuring
hole 21 opposed to an upstream end of the fixed measuring hole 15c. Ascending and
descending of the bypass valve 20 changes a communication area between the movable
measuring hole 21 and the fixed measuring hole 15c, thereby regulating the opening
degree of the bypass 15.
[0026] A rotation-preventing means 22 is provided between the bypass valve 20 and the valve
body portion 16. The rotation-preventing means 22 allows the bypass valve 20 to move
up and down, while holding the movable measuring hole 21 at a position where it faces
the fixed measuring hole 15c. The rotation-preventing means 22 comprises a vertical
key groove 24 provided in the other sidewall of the bypass valve 20 on the side opposite
from the movable measuring hole 21, and a pin-shaped key 23 integrally projectingly
provided at a central portion of an inner end surface of the plug 18.
[0027] A mounting hole 25 having a diameter larger than that of the valve hole 15b and coaxial
with the valve hole 15b is provided in the valve body portion 16 so as to be open
in the first end surface 16a. A stepping motor 27 is mounted in the mounting hole
25 so as to serve as an actuator for opening and closing the bypass valve 20 such
that its output shaft 27b projects toward the bypass valve 20. A synthetic resin covering
member 28 is mold-coupled to a metallic stator 27a of the stepping motor 27 so as
to cover both inner and outer end surfaces and an outer peripheral surface of the
stator 27a. Integrally molded in the covering member 28 are a mounting flange 28a
protruding from an outer peripheral surface of the covering member 28, and a power-supply
coupler 31 for the stepping motor 27 projecting from an outer end surface of the mounting
flange 28a. When mounting the stepping motor 27 in the mounting hole 25, the outer
peripheral surface of the covering member 28 is fitted to the inner peripheral surface
of the mounting hole 25, and a plate-shaped seal member 29 including a lip 29a which
closely contacts the outer peripheral surface of the output shaft 27b is interposed
between the inner end surface of the covering member 28 and the bottom surface of
the mounting hole 25. The mounting flange 28a is fixedly attached on the first end
surface 16a of the valve body portion 16 by a plurality of screws 36. At this time,
no seal member is interposed between the mounting flange 28a and the first end surface
16a.
[0028] Accordingly, the valve body portion 16 and the second shaft-receiving boss 4 are
close to each other, and their end surfaces face in the same direction. Thus, the
stepping motor 27 and the sensor box 10 are easily mounted on these end surfaces without
changing the orientation of the throttle body 1, thereby contributing to an improvement
in efficiency of assembling operation.
[0029] The output shaft 27b of the stepping motor 27 is screwed into a female screw member
30 attached to the central portion of the bypass valve 20. The normal rotation and
reverse rotation of the output shaft 27b ascend and descend (open and close) the bypass
valve 20. An electronic control unit 32 for controlling power supply to the stepping
motor 27 is connected to a terminal in the coupler 31. Detection signals are input
to the electronic control unit 32 from the throttle sensor 11, the intake-air temperature
sensor 12, the boost negative-pressure sensor 13 and the other components. In accordance
with these signals, the electronic control unit 32 controls the operation of the stepping
motor 27, and further controls the operation of a fuel injection valve of the engine
not shown.
[0030] Next, operation of this embodiment will be described.
[0031] When the engine is operated with the throttle valve 7 fully closed, air taken in
and flowing into the intake path 2 is passed through the bypass 15 bypassing the throttle
valve 7, that is, the inlet port 15a, valve- hole 15b, fixed measuring hole 15c, intermediate
curved path 15e and outlet port 15f, and supplied to the engine. If the engine is
in a warm-up operation state at this time, the stepping motor 27 is operated by the
electronic control unit 32 in the direction to pull up the bypass valve 20 to regulate
the communication area with the fixed measuring hole 15c and the movable measuring
hole 21 to be large. Therefore, the amount of intake air is increased and the engine
enters a fast idling state. After the warm-up operation, the stepping motor 27 is
operated by the control unit 32 in the direction to pull down the bypass valve 20
to reduce the communication area with the fixed measuring hole 15c and the movable
measuring hole 21. Therefore, the amount of intake air is decreased and the engine
enters a normal idling state.
[0032] The bypass valve 20 moving up and down as described above is prevented from turning
by engagement between the vertical key groove 24 provided in its sidewall and the
key 23 fixed on the valve body portion 16. Therefore, it is possible to maintain an
appropriate opposed-position relationship between the movable measuring hole 21 of
the bypass valve 20 and the fixed measuring hole 15c of the throttle body 1, thereby
stabilizing the regulation of the intake air amount.
[0033] Especially because the key 23 is integrally formed with the plug 18 for closing the
machining hole 17 which is used for drilling the fixed measuring hole 15c in the valve
body portion 16. Thus, it is possible to always easily and accurately maintain a constant
positional relationship between the fixed measuring hole 15c and the key 23 in the
mass-produced engine intake system, thereby greatly contributing to stabilization
of idling characteristics of the engine.
[0034] Also because the plug 18 has the key 23, there is no need to mount a special key
on the valve body portion 16. Accordingly, the number of parts and assembling steps
are reduced, thereby reducing the cost.
[0035] Further, because the valve body portion 16 forming the valve hole 15b is integrally
formed on the throttle body 1, in other words, because the valve hole 15b is bored
in the throttle body 1, and because the stepping motor 27 for operating the bypass
valve 20 fitted into the valve hole 15b is also mounted on the valve body portion
16, that is, the throttle body 1, it is possible to further reduce the number of parts
and assembling steps, and effectively downsizing the entire throttle body 1 equipped
with the bypass valve 20 and the stepping motor 27. Therefore, even in such a case
of a motorcycle.where a space around an engine is small, the throttle body can be
easily placed therein.
[0036] Furthermore, the valve hole 15b, mounting hole 25 and outlet port 15f are arranged
in parallel with the first and second shaft-receiving holes 5, 6 of the valve shaft
7a. Therefore, the valve hole 15b, mounting hole 25 and outlet port 15f can be machined
at a time by the multi-shaft drilling machine together with the first and second shaft-receiving
holes 5, 6, thereby further reducing the number of assembling steps.
[0037] Moreover, the valve hole 15b is arranged on the side opposite from the outlet port
15f of the bypass 15 with the throttle valve 7 interposed therebetween, and at a position
above the axis A of the intake path 2; whereas the outlet port 15f is arranged below
the axis A of the intake path 2. Therefore, the distance between the valve hole 15b
and the outlet port 15f is secured to be large while arranging the valve hole 15b
at a high position. Thus, even if the blowback gas enters the outlet port 15f upon
engine blowback, the blowback gas does not easily reach the valve hole 15b, thereby
preventing moisture and carbon contained in the blowback gas from being frozen and
adhering to the bypass valve 20 to prevent the bypass valve 20 from being fixed to
a position. Particularly in the throttle body 1, the fuel does not flow into the bypass
15 unlike a carburetor including a bypass, and thus no foreign-material cleaning-action
by the fuel occurs around the valve hole 15b. Therefore, it is very important to prevent
foreign materials from entering the valve hole 15b.
[0038] On the other hand, the inlet port 15a of the bypass 15 is open in the upper portion
of the upstream-side end-surface of the throttle body 1 to directly face the intake
air flow, and thus the inlet port 15a smoothly receives thereinto the intake air,
thereby contributing to stabilization of idling of the engine.
[0039] The synthetic resin covering member 28 is mold-coupled to the stator 27a of the stepping
motor 27 so as to cover both the inner and outer end surfaces and the outer peripheral
surface of the stator 27a; and the seal member 29 which closely contacts the outer
peripheral surface of the output shaft 27b is interposed between the inner end surface
of the covering member 28 and the bottom surface of the mounting hole 25, thereby
configuring the stepping motor 27 into a waterproof type to prevent rust development
on the outer surface of the stator 27a due to water invasion. That is, the seal member
29, by itself, plays two roles of preventing the water from invading the interior
of the stepping motor 27 from the outer peripheral surface of the output shaft 27b,
and also preventing the water from invading a space between the inner end portion
of the covering member 28 and the stator 27a. Therefore, any seal member for preventing
the water invasion into the mounting hole 25 is no longer required, thereby reducing
the numbers of parts and assembling steps to reduce the cost.
[0040] Further, the mounting flange 28a for mounting the stepping motor 27 on the valve
body portion 16 is integrally formed on the covering member 28. Therefore, any special
lid for holding the stepping motor 27 is no longer required, thereby further reducing
the numbers of parts and assembling steps to further reduce the cost.
[0041] Furthermore, the power-supply coupler 31 for supplying power to the stepping motor
27 is provided in the covering member 28 such that the coupler 31 projects outward
from the mounting flange 28a. Thus, the mounting flange 28a is used for mounting of
not only the stepping motor 27 but also the coupler 31, thereby further reducing the
numbers of parts and assembling steps.
[0042] The present invention is not limited to the above- described embodiment, and various
changes in design can be made without departing from the subject matter of the present
invention. For example, the flange 28a may be replaced by a holding plate which is
a member separate from the covering member 28.
[0043] An engine intake system includes: a bypass (15) bypassing a throttle valve (7) and
connected to an intake path (2); and a bypass valve (20) for regulating an opening
degree of the bypass (15). A part of the bypass (15) includes: an inlet port (15a)
provided in a throttle body (1) so that the inlet port (15a) is open in the intake
path (2) at a position upstream of the throttle valve (7); a valve hole (15b) provided
in the throttle body (1) so as to fittingly receive therein the bypass valve (20);
and an outlet port (15f) provided in the throttle body (1) so that the outlet port
(15f) is open in the intake path (2) at a position downstream of the throttle valve
(7). The valve hole (15b) is arranged on a side opposite from the outlet port (15f)
with the throttle valve (7) interposed therebetween, and at a position above the outlet
port (15f) and parallel with the shaft-receiving hole (5, 6) supporting a valve shaft
(7a) of the throttle valve (7). Thus, there is provided a small engine intake system
in which engine blowback has a difficulty in reaching a bypass valve, and which has
an excellent productivity.
1. Motor-Ansaugsystem, umfassend:
einen Drosselkörper (1), der einen horizontalen Ansaugpfad (2) und ein darin ausgebildetes
Wellen-aufnehmendes Loch (5, 6) umfasst;
ein Drosselventil (7), das an einer Ventilwelle (7a) davon in dem Wellen-aufnehmenden
Loch (5, 6) gelagert ist, um den Ansaugpfad (2) zu öffnen und zu schließen;
eine Überbrückung (15), die das Drosselventil (7) überbrückt und mit dem Ansaugpfad
(2) verbunden ist;
ein Überbrückungsventil (20) zum Regulieren eines Öffnungsgrades der Überbrückung
(15) und
einen Aktuator (27) zum Betätigen des Überbrückungsventils (20),
wobei wenigstens ein Teil der Überbrückung (15) umfasst:
eine Einlassöffnung (15a), die so in dem Drosselkörper (1) vorgesehen ist, dass die
Einlassöffnung (15a) in dem Ansaugpfad (2) an einer Position stromaufwärts von dem
Drosselventil (7) offen ist, ein Ventilloch (15b), das so in dem Drosselkörper (1)
vorgesehen ist, dass es darin passend das Überbrückungsventil (20) aufnimmt und eine
Auslassöffnung (15f), die so in dem Dosselkörper (1) vorgesehen ist, dass die Auslassöffnung
(15f) in dem Ansaugpfad (2) an einer Position stromabwärts von dem Drosselventil (7)
offen ist, und wobei
das Ventilloch (15b) auf einer der Auslassöffnung (15f) gegenüberliegenden Seite angeordnet
ist, wobei das Drosselventil (7) dazwischen angeordnet ist, wobei das Ventilloch (15b)
oberhalb einer Achse (A) des Ansaugpfades (2), an einer Position oberhalb der Auslassöffnung
(15f) und parallel zu dem Wellen-aufnehmenden Loch (5, 6) angeordnet ist, und wobei
die Auslassöffnung (15f) parallel zu dem Wellen-aufnehmenden Loch (5, 6) angeordnet
ist,
dadurch gekennzeichnet, dass
ein Drosselsensor (11) an einer Seitenwand des Drosselkörpers (1) angeordnet ist und
einen Öffnungsgrad des Drosselventils (7) erfasst, und
die Auslassöffnung (15f) unterhalb der Achse (A) angeordnet ist.
2. Motor-Ansaugsystem gemäß Anspruch 1,
dadurch gekennzeichnet, dass die Einlassöffnung (15a) so angeordnet ist, dass sie an einem oberen Abschnitt einer
stromaufwärtsseitigen Endfläche des Drosselkörpers (1) offen ist.
3. Motor-Ansaugsystem gemäß Anspruch 1 oder 2,
dadurch gekennzeichnet, dass der Aktuator (27) und ein Sensorbehälter (10), der den Drosselsensor (11) hält, an
Endflächen des Drosselkörpers (1) angebracht sind, wobei die Endflächen in die gleiche
Richtung zeigen.
1. Système d'admission pour moteur thermique comprenant :
un corps de papillon des gaz (1) comprenant un passage d'admission horizontal (2)
et un orifice de réception d'arbre (5, 6) formé en lui ;
un papillon des gaz (7) supporté par un arbre de papillon (7a) de celui-ci situé dans
l'orifice de réception d'arbre (5, 6) de manière à ouvrir et à fermer le passage d'admission
(2) ;
un passage de dérivation (15) mettant en dérivation le papillon des gaz (7) et relié
au passage d'admission (2) ;
une soupape de dérivation (20) destinée à réguler un degré d'ouverture du passage
de dérivation (15) ; et
un dispositif de commande (27) destiné à commander la soupape de dérivation (20) ;
dans lequel au moins une partie du passage de dérivation (15) comprend :
un orifice d'entrée (15a) agencé dans le corps de papillon des gaz (1) de manière
à ce que l'orifice d'entrée (15a) s'ouvre dans le passage d'admission (2) dans une
position située en amont du papillon des gaz (7) ; un orifice de soupape (15b) agencé
dans le corps de papillon des gaz (1) de manière à ce qu'il reçoive de façon ajustée
la soupape de dérivation (20) ; et un orifice de sortie (15f) agencé dans le corps
de papillon des gaz (1) de manière à ce que l'orifice de sortie (15f) s'ouvre dans
le passage d'admission (2) dans une position située en aval du papillon des gaz (7)
; et dans lequel,
l'orifice de soupape (15b) est agencé sur un côté opposé à l'orifice de sortie (15f),
le papillon des gaz (7) étant disposé entre eux, l'orifice de soupape (15b) est agencé
au-dessus d'un axe (A) du passage d'admission (2), dans une position située au-dessus
de l'orifice de sortie (15f) et parallèle à l'orifice de réception d'arbre (5, 6)
; et dans lequel,
l'orifice de sortie (15f) est agencé parallèlement à l'orifice de réception d'arbre
(5, 6) ;
caractérisé en ce que :
un capteur de papillon des gaz (11) est fixé sur une paroi latérale du corps de papillon
des gaz (1) et détecte un degré d'ouverture du papillon des gaz (7) ; et
l'orifice de sortie (15f) est agencé en dessous de l'axe (A).
2. Système d'admission pour moteur thermique selon la revendication 1, caractérisé en ce que l'orifice d'entrée (15a) est agencé de manière à s'ouvrir sur une partie supérieure
d'une surface d'extrémité du côté amont du corps de papillon des gaz (1).
3. Système d'admission pour moteur thermique selon la revendication 1 ou 2, caractérisé en ce que le dispositif de commande (27) et un boîtier de capteur (10) qui retient le capteur
de papillon des gaz (11) sont fixés sur des surfaces d'extrémité du corps de papillon
des gaz (1), les faces d'extrémité étant dirigées dans la même direction.