EP4230857A1 - Drosselvorrichtung und ansauganordnung - Google Patents

Drosselvorrichtung und ansauganordnung Download PDF

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Publication number
EP4230857A1
EP4230857A1 EP22213104.7A EP22213104A EP4230857A1 EP 4230857 A1 EP4230857 A1 EP 4230857A1 EP 22213104 A EP22213104 A EP 22213104A EP 4230857 A1 EP4230857 A1 EP 4230857A1
Authority
EP
European Patent Office
Prior art keywords
throttle
bore
end surface
intake
pair
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP22213104.7A
Other languages
English (en)
French (fr)
Inventor
Jun Kiyono
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mikuni Corp
Original Assignee
Mikuni Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mikuni Corp filed Critical Mikuni Corp
Publication of EP4230857A1 publication Critical patent/EP4230857A1/de
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D9/00Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/08Throttle valves specially adapted therefor; Arrangements of such valves in conduits
    • F02D9/10Throttle valves specially adapted therefor; Arrangements of such valves in conduits having pivotally-mounted flaps
    • F02D9/1035Details of the valve housing
    • F02D9/104Shaping of the flow path in the vicinity of the flap, e.g. having inserts in the housing
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D9/00Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/08Throttle valves specially adapted therefor; Arrangements of such valves in conduits
    • F02D9/10Throttle valves specially adapted therefor; Arrangements of such valves in conduits having pivotally-mounted flaps
    • F02D9/107Manufacturing or mounting details

Definitions

  • the present disclosure relates to a throttle device and an intake assembly.
  • a throttle device provided in an intake passage of an internal combustion engine for adjusting the flow rate of intake air is known.
  • Atypical throttle device has a throttle shaft rotatably provided in a bore of a throttle body, and a throttle valve fixed to the throttle shaft.
  • the throttle valve is opened and closed as the throttle shaft rotates.
  • Patent Document 1 describes a throttle device in which a diffuser is provided downstream of the throttle body.
  • the diffuser has a flow-path cross-sectional area that expands downstream.
  • Downstream of the throttle shaft a straightening protrusion formed to protrude inward from the inner surface of the throttle body is provided.
  • the straightening protrusion has a valve insertion groove into which the throttle valve can be inserted from the diffuser side.
  • the throttle device is assembled by rotatably attaching the throttle shaft to the throttle body and then attaching the throttle valve to the throttle shaft from upstream or downstream of the bore.
  • Patent Document 1 JP2000-179364A
  • an object of at least one embodiment of the present invention is to provide a throttle device and an intake assembly that facilitate the assembly of the throttle valve and suppress an increase in the flow path resistance in the bore.
  • the throttle valve by moving the throttle valve in the bore along the grooves that run from the through holes, through which the throttle shaft passes, to the edge of the second open end of the bore, the throttle valve can be easily assembled from the second end surface of the throttle body.
  • FIG. 1 is a configuration diagram of an intake assembly according to an embodiment.
  • an intake assembly 100 includes a throttle device 10 having a bore 12 that forms an intake flow path 13, and an intake part 110 having an intake passage 113 that communicates with the intake flow path 13.
  • the intake passage 113 is formed by an internal flow path 112 of the intake part 110.
  • the intake part 110 may be an intake boot or an intake manifold.
  • the material of the intake part 110 may be resin, rubber, or metal.
  • the intake part 110 made of rubber can suppress vibration transmitted to the throttle device 10.
  • the intake assembly 100 includes, in addition to the throttle device 10 and the intake part 110, another intake part 150 located on the opposite side of the throttle device 10 from the intake part 110.
  • the intake assembly 100 constitutes an intake system for an engine 300.
  • the engine 300 includes a cylinder 302 and a piston 304 that reciprocates within the cylinder 302.
  • a cylinder block having the cylinder 302 is provided with an intake valve 320.
  • the intake valve 320 opens and closes in conjunction with the reciprocating motion of the piston 304, thereby switching the supply state of the air-fuel mixture to the cylinder 302.
  • a fuel injection device 310 for injecting fuel into the intake passage 113 is provided upstream of the intake valve 320 and downstream of a valve assembly 30, which will be described later. Fuel injected from the fuel injection device 310 is mixed with intake air flowing through the intake assembly 100 and supplied to the cylinder 302 as the air-fuel mixture.
  • the piston 304 is pushed down by energy generated by combustion of the air-fuel mixture taken into the cylinder 302 via the intake valve 320.
  • the reciprocating motion of the piston 304 is transmitted to a crankshaft 308 via a connecting rod 306.
  • the throttle device 10 includes a throttle body 20 having a bore 12 and a valve assembly 30 disposed within the bore 12.
  • the throttle body 20 has a first end surface 21 and a second end surface 22 through which the bore 12 opens.
  • the first end surface 21 and the second end surface 22 are both end surfaces of the throttle body 20 in the flow direction of intake air (the direction of the center axis of the bore 12), and the second end surface 22 is opposite to the first end surface 21.
  • the valve assembly 30 is provided in the intake flow path 13 communicating with the intake passage 113 of the intake part 110 and is used to adjust the amount of intake air.
  • the valve assembly 30 includes a throttle shaft 40 rotatably disposed within the bore 12 and a throttle valve 50 fixed to the throttle shaft 40 so as to be located at least partially within the bore 12.
  • the throttle valve 50 is opened and closed by rotating around the central axis of the throttle shaft 40 as the throttle shaft 40 rotates.
  • the throttle valve 50 can be switched from a closed position, where the valve is oriented perpendicular to the intake air flow, to an open position, where the valve is oriented along the intake air flow, by turning 90 degrees in the direction of arrow A with the rotation of the throttle shaft 40.
  • FIG. 1 shows the throttle valve 50 in a substantially closed position.
  • valve assembly 30 The specific configuration of the valve assembly 30 will be described later in detail.
  • the intake part 110 is connected to the throttle device 10.
  • the second end surface 22 of the throttle body 20 is a contact surface with the intake part 110.
  • the intake part 110 is connected to the throttle body 20 at the second end surface 22.
  • a groove 24 is formed on the inner surface of the bore 12 of the throttle body 20.
  • the groove 24 of the throttle body 20 may have a shape complementary to a protrusion 114 provided on the intake part 110. In this case, when the intake part 110 is assembled to the throttle device 10, the protrusion 114 of the intake part 110 may fit into the groove 24.
  • the other intake part 150 is disposed upstream of the throttle device 10, and the intake part 110 is disposed downstream of the throttle device 10.
  • the first end surface 21 connected to the other intake part 150 is an upstream end surface of the throttle body 20 in the intake air flow direction
  • the second end surface 22 connected to the intake part 110 is a downstream end surface of the throttle body 20 in the intake air flow direction.
  • FIG. 2 is a cross-sectional view of the throttle device 10 according to an embodiment, showing a cross-section of the throttle device 10 taken along the extension direction of the throttle shaft 40.
  • FIG. 3 is a partial cross-sectional view of the throttle device 10 according to an embodiment, with a portion of the throttle body 20 cut open to expose the valve assembly 30.
  • FIG. 4 is a partial cross-sectional view of the throttle body 20 according to an embodiment, with the valve assembly 30 removed from FIG. 3 .
  • FIG. 5 is a perspective view of the throttle device 10 according to an embodiment, as viewed from the second end surface 22.
  • FIG. 6A is a partial cross-sectional view showing a structure in the bore of the throttle device 10 according to an embodiment, where a cross-section of the throttle device 10 taken along a plane perpendicular to the extension direction of the throttle shaft 40 is viewed from the extension direction of the throttle shaft 40.
  • FIG. 6B is a partial cross-sectional view showing a structure in the bore of the throttle device 10 according to another embodiment, where a cross-section of the throttle device 10 taken along a plane perpendicular to the extension direction of the throttle shaft 40 is viewed from the extension direction of the throttle shaft 40.
  • the throttle device 10 includes a throttle body 20, and a valve assembly 30 for adjusting the flow rate of intake air passing through an intake flow path 13 formed in the throttle body 20.
  • the throttle body 20 has a bore 12.
  • the bore 12 has a first open end 14 on the first end surface 21 of the throttle body 20 and a second open end 16 on the second end surface 22 of the throttle body 20.
  • the cross-sectional shape of the bore 12 is not limited, but may be circular, oval, or a shape with a profile defined by a curve combining multiple arcs.
  • the intake flow path 13 formed by the inner surface of the bore 12 decreases in flow-path cross-sectional area at least partially from the first open end 14 to the second open end 16 of the bore 12.
  • the flow-path cross-sectional area of the intake flow path 13 decreases continuously over the entire section of the intake flow path 13 from the first open end 14 to the second open end 16.
  • the intake flow path 13 has a section where the flow-path cross-sectional area of the intake flow path 13 is constant and a section where the flow-path cross-sectional area of the intake flow path 13 decreases from the first open end 14 to the second open end 16.
  • the inner surface of the bore 12 may at least partially have a tapered shape that is oblique to the center axis O of the bore 12 (see FIGs. 2 and 4 ).
  • the bore 12 may have a tapered inner surface that is oblique to the center axis O so that the inner diameter of the bore 12 decreases from the first open end 14 to the second open end 16.
  • the bore 12 has the above-described tapered inner surface along the entire length of the bore 12 from the first open end 14 to the second open end 16.
  • the inner surface of the bore 12 includes a straight portion with a constant inner diameter and the above-described tapered portion with a varying inner diameter.
  • the throttle body 20 has a pair of through holes 18 passing through the throttle body 20 in the extension direction of the throttle shaft 40. Both end portions of the throttle shaft 40 are inserted into the pair of through holes 18, respectively.
  • each through hole 18 opens to the inner surface of the bore 12.
  • the inner surface of the bore 12 has, in addition to the pair of through holes 18, a pair of grooves 24 leading to the respective through holes 18.
  • Each groove 24 runs continuously from the corresponding through hole 18 to the edge of the second open end 16 of the bore 12. That is, one end of the groove 24 opens to the through hole 18, and the other end of the groove 24 opens to the second end surface 22 of the throttle body 20.
  • the pair of grooves 24 extend along line segments 19 where a plane P including the center axis O of the bore 12 and the rotation center axis R of the throttle shaft 40 intersects the inner surface of the bore 12. In other words, each groove 24 is provided on the plane P.
  • the throttle valve 50 in the fully open position is on the plane P.
  • the pair of grooves 24 continuously extend from the through holes 18 to the edge of the second open end 16 along the fully open throttle valve 50.
  • the total depth d(x) of the grooves 24 at that position satisfies L(x)-d ⁇ Dmax ⁇ L(x), where L(x) is a distance between the bottom surfaces 25 of the pair of grooves 24 at that position.
  • d(x) and L(x) are meant to be functions of the longitudinal position x of the grooves 24.
  • the bottom surface 25 of each groove 24 is a plane along the center axis O of the bore 12, and the distance L(x) between the bottom surfaces 25 of the pair of grooves 24 is constant at any longitudinal position x.
  • the throttle shaft 40 includes a slit 41 into which the throttle valve 50 can be inserted, and a fastener 42 for fastening the throttle valve 50 inserted into the slit 41.
  • the shape of the slit 41 is not particularly limited as long as the throttle valve 50 can be inserted.
  • the slit 41 has a rectangular cross-sectional shape, where the slit width of the slit 41 corresponds to the thickness of the throttle valve 50, and the slit length of the slit 41 is larger than the maximum dimension Dmax of the throttle valve 50.
  • the slit length of the slit 41 means the length of the slit 41 in the extension direction of the throttle shaft 40.
  • the fastener 42 may include a bolt or a screw that passes through a through hole (not shown) provided in the throttle valve 50.
  • the throttle shaft 40 may have a female threaded hole into which the fastener 42, such as a bolt or a screw, is screwed.
  • the throttle shaft 40 has a flat surface 44 at least in the position of the throttle valve 50 fastened by the fastener 42.
  • the flat surface 44 may be a plane along the extension direction of the throttle valve 50. In this case, the flat surface 44 may be parallel to the plane P when the throttle valve 50 is fully open, as shown in FIGs. 6A and 6B .
  • the portion of the throttle shaft 40 exposed to the intake flow path 13 formed by the bore 12 has the flat surface 44.
  • the portion of the throttle shaft 40 inserted into the through hole 18 formed in the throttle body 20 has a cylindrical shape.
  • the thickness of the throttle valve 50 is set so as to satisfy a predetermined relationship with the width of the pair of grooves 24.
  • the width w of each groove 24 is larger than the thickness t of the throttle valve 50.
  • the width w of each groove 24 is constant for any longitudinal position x of the groove 24 along the center axis O of the bore 12.
  • the width w of each groove 24 monotonously increases from the first end surface 21 to the second end surface 22.
  • the width w of the groove 24 at the connection position with the through hole 18 i.e., the minimum value of width w of the groove 24
  • FIGs. 3 to 6B show an example of the throttle valve 50 with a constant thickness t at any position, but the thickness of the throttle valve 50 may vary with position.
  • the width w of each groove 24 may be determined based on the thickness t of the outer edge of the throttle valve 50 along the extension direction of the throttle shaft 40. That is, the width w of each groove 24 may be set to be larger than the thickness t of the portion (outer edge portion) of the throttle valve 50 inserted into the corresponding groove 24 or the portion (outer edge portion) of the throttle valve 50 closest to the corresponding groove 24.
  • the grooves 24 on the inner surface of the bore 12 run from the through holes 18 to the edge of the second open end 16. Accordingly, by closing the grooves 24 with the protrusions 114 (see FIG. 1 ) of the intake part 110 connected to the throttle device 10 at the second end surface 22, the increase in flow path resistance in the bore 12 can be suppressed.
  • the pair of grooves 24 extend along the line segments 19 where the plane P including the center axis O of the bore 12 and the rotation center axis R of the throttle shaft 40 intersects the inner surface of the bore 12. Accordingly, by linearly moving the throttle valve 50 in the bore 12 along the grooves 24 (along the plane P) while keeping the orientation of the throttle valve 50 in the fully open position ( FIGs. 3 and 5 to 6B ), the throttle valve 50 can be easily assembled to the throttle shaft 40.
  • L-d ⁇ Dmax ⁇ L is satisfied, where Dmax is the maximum dimension of the throttle valve 50 along the extension direction of the throttle shaft 40, L is the distance between the bottom surfaces 25 of the pair of grooves 24 on the second end surface 22, and d is the total depth of the pair of grooves 24 on the second end surface 22.
  • FIG. 7 is a perspective view of the intake part 110 according to an embodiment.
  • FIG. 8 is a perspective view of an internal structure of the intake part 110 and the throttle body 20 according to an embodiment, with the intake part 110 and the throttle body 20 cut open to show the inside of the intake flow path 13 and the intake passage 113.
  • FIG. 9 is a schematic view of a cross-section of the intake part 110 and the throttle body 20 according to an embodiment.
  • the intake part 110 includes a contact surface 116 that contacts the second end surface 22 of the throttle body 20, and a pair of protrusions 114 that protrude from the contact surface 116 toward the throttle body 20 along the plane P.
  • Each protrusion 114 has a flow path forming surface 115 continuously connected to a flow path wall of the internal flow path 112 of the intake part 110 forming the intake passage 113.
  • the flow path forming surfaces 115 of the pair of protrusions 114 are arranged to face each other with the intake passage 113 interposed therebetween.
  • each protrusion 114 is located on an intersection line 117 between the contact surface 116 and the plane P (see FIGs. 3 , 4 , 6A and 6B ) including the center axis O of the bore 12 and the rotation center axis R of the throttle shaft 40.
  • the pair of protrusions 114 are fitted into the grooves 24 of the throttle body 20 when the intake part 110 is assembled to the throttle device 10.
  • the flow path forming surface 115 of each protrusion 114 forms the flow path wall of the intake flow path 13 along the inner surface of the bore 12 around each groove 24.
  • the turbulence of intake air flow in the intake flow path 13 can be suppressed more effectively, and the flow path resistance in the bore 12 can be reduced.
  • Each protrusion 114 has a shape corresponding to the groove 24 to be fitted.
  • each protrusion 114 has a tapered shape corresponding to each groove 24 (see FIG. 6B ) that decreases in groove width w from the second end surface 22 to the through hole 18.
  • the tapered protrusion 114 can be easily fitted into the groove 24.
  • each protrusion 114 has a straight shape corresponding to the groove 24 with a constant groove width w over the entire length of the groove 24 from the second end surface 22 to the through hole 18.
  • the above-described embodiments mainly describe the throttle device 10 including the throttle valve 50 of a flat plate shape with a constant thickness in any position, but the shape of the throttle valve is not limited to this example.
  • FIG. 10 is a perspective view of a valve assembly 400 according to an embodiment.
  • FIG. 11A is a partial cross-sectional view showing a structure in a bore of a throttle device 500 according to an embodiment, where a cross-section of the throttle device 500 taken along a plane perpendicular to the extension direction of a throttle shaft 40 is viewed from the extension direction of the throttle shaft 40.
  • FIG. 11B is a partial cross-sectional view showing a structure in a bore of a throttle device 600 according to another embodiment, where a cross-section of the throttle device 600 taken along a plane perpendicular to the extension direction of a throttle shaft 40 is viewed from the extension direction of the throttle shaft 40.
  • FIGs. 10 to 11B the configurations of the throttle body 20 and the throttle shaft 40 are the same as those described above with reference to FIGs. 2 to 6B , and the connection structure between the throttle device 500, 600 and the intake part 110 is the same as those described above with reference to FIGs. 7 to 9 .
  • the throttle valve 450 includes a first portion 452 and a second portion 454 thicker than the first portion 452.
  • the second portion 454 of the throttle valve 450 has a streamlined profile that decreases in thickness with increasing distance from the throttle shaft 40.
  • the turbulence of intake air flow in the bore 12 due to the throttle shaft 40 and the throttle valve 450 can be suppressed, and the resistance of the intake flow path in the bore 12 can be reduced.
  • the first portion 452 is set to have a thickness that allows it to pass through the slit 41 of the throttle shaft 40. That is, the thickness of the first portion 452 is equal to or smaller than the slit width of the slit 41.
  • the thickness of the second portion 454 has a maximum thickness larger than the slit width of the slit 41.
  • the second portion 454 having a streamlined profile should be disposed downstream of the throttle shaft 40.
  • the throttle valve 450 should be oriented such that the second portion 454 is disposed on the second end surface 22 side of the throttle shaft 40 on the plane P in the fully open position.
  • the first portion 452 is disposed on the first end surface 21 side of the throttle shaft 40, and the second portion 454 is disposed on the second end surface 22 side of the throttle shaft 40.
  • the throttle valve 450 is inserted into the bore 12 from the second open end 16 with a narrow flow-path cross-sectional area, and the first portion 452 is inserted into the slit 41 of the throttle shaft 40.
  • the contact between the throttle valve 450 and the inner surface of the bore 12 can be a problem, but since the inner surface of the bore 12 has the grooves 24 that run from the through holes 18 to the edge of the second open end 16, the grooves 24 avoid the contact between the throttle valve 450 and the inner surface of the bore 12.
  • the width w of the pair of grooves 24 is larger than the maximum thickness tmax of the second portion 454 of the throttle valve 450.
  • the width w of each groove 24 is constant at any longitudinal position x of the groove 24 along the center axis O of the bore 12.
  • the width w of each groove 24 monotonously increases from the first end surface 21 to the second end surface 22.
  • the width w of the groove 24 at the connection position with the through hole 18 i.e., the minimum value of width w of the groove 24
  • the maximum thickness tmax of the second portion 454 of the throttle valve 50 is larger than the maximum thickness tmax of the second portion 454 of the throttle valve 50.
  • the end portion (outer edge portion) of the second portion 454 of the throttle valve 450 can be inserted into the grooves 24, making it easier to avoid the contact between the throttle valve 450 and the inner surface of the bore 12.
  • an expression of relative or absolute arrangement such as “in a direction”, “along a direction”, “parallel”, “orthogonal”, “centered”, “concentric” and “coaxial” shall not be construed as indicating only the arrangement in a strict literal sense, but also includes a state where the arrangement is relatively displaced by a tolerance, or by an angle or a distance whereby it is possible to achieve the same function.
  • an expression of an equal state such as “same” “equal” and “uniform” shall not be construed as indicating only the state in which the feature is strictly equal, but also includes a state in which there is a tolerance or a difference that can still achieve the same function.
  • an expression of a shape such as a rectangular shape or a cylindrical shape shall not be construed as only the geometrically strict shape, but also includes a shape with unevenness or chamfered corners within the range in which the same effect can be achieved.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
EP22213104.7A 2022-02-22 2022-12-13 Drosselvorrichtung und ansauganordnung Pending EP4230857A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2022025291A JP2023121928A (ja) 2022-02-22 2022-02-22 スロットル装置及びインテークアセンブリ

Publications (1)

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EP4230857A1 true EP4230857A1 (de) 2023-08-23

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EP22213104.7A Pending EP4230857A1 (de) 2022-02-22 2022-12-13 Drosselvorrichtung und ansauganordnung

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04134140A (ja) * 1990-09-27 1992-05-08 Fuji Oozx Kk バタフライ式排気バルブ
US5329903A (en) * 1991-11-05 1994-07-19 Filterwerk Mann & Hummel Gmbh Pivotable joint
JPH09133224A (ja) * 1995-11-02 1997-05-20 Ngk Insulators Ltd 高温流体用バタフライ弁
JPH11351416A (ja) * 1998-06-12 1999-12-24 Aisan Ind Co Ltd バタフライバルブ装置とそのバタフライバルブの組付方法
JP2000179364A (ja) 1998-12-15 2000-06-27 Aisan Ind Co Ltd ディフューザ付スロットルボデー
EP1213456A2 (de) * 2000-12-05 2002-06-12 Robert Bosch Gmbh Strömungstelleinheit
EP2881564A1 (de) * 2013-12-04 2015-06-10 Magneti Marelli S.p.A. Drosselklappe für einen Verbrennungsmotor mit einem metallischen, in einen Ventilkörper aus Kunststoffmaterial umspritzten Ventilsitz

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04134140A (ja) * 1990-09-27 1992-05-08 Fuji Oozx Kk バタフライ式排気バルブ
US5329903A (en) * 1991-11-05 1994-07-19 Filterwerk Mann & Hummel Gmbh Pivotable joint
JPH09133224A (ja) * 1995-11-02 1997-05-20 Ngk Insulators Ltd 高温流体用バタフライ弁
JPH11351416A (ja) * 1998-06-12 1999-12-24 Aisan Ind Co Ltd バタフライバルブ装置とそのバタフライバルブの組付方法
JP2000179364A (ja) 1998-12-15 2000-06-27 Aisan Ind Co Ltd ディフューザ付スロットルボデー
EP1213456A2 (de) * 2000-12-05 2002-06-12 Robert Bosch Gmbh Strömungstelleinheit
EP2881564A1 (de) * 2013-12-04 2015-06-10 Magneti Marelli S.p.A. Drosselklappe für einen Verbrennungsmotor mit einem metallischen, in einen Ventilkörper aus Kunststoffmaterial umspritzten Ventilsitz

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