CN109441621A - Supercharging device for combustion engine - Google Patents
Supercharging device for combustion engine Download PDFInfo
- Publication number
- CN109441621A CN109441621A CN201811373257.6A CN201811373257A CN109441621A CN 109441621 A CN109441621 A CN 109441621A CN 201811373257 A CN201811373257 A CN 201811373257A CN 109441621 A CN109441621 A CN 109441621A
- Authority
- CN
- China
- Prior art keywords
- electric machine
- machine casing
- combustion engine
- electronic circuit
- supercharging device
- 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
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/46—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements involving the transfer of heat by flowing fluids
- H01L23/473—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements involving the transfer of heat by flowing fluids by flowing liquids
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B33/00—Engines characterised by provision of pumps for charging or scavenging
- F02B33/32—Engines with pumps other than of reciprocating-piston type
- F02B33/34—Engines with pumps other than of reciprocating-piston type with rotary pumps
- F02B33/40—Engines with pumps other than of reciprocating-piston type with rotary pumps of non-positive-displacement type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B39/00—Component parts, details, or accessories relating to, driven charging or scavenging pumps, not provided for in groups F02B33/00 - F02B37/00
- F02B39/005—Cooling of pump drives
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B39/00—Component parts, details, or accessories relating to, driven charging or scavenging pumps, not provided for in groups F02B33/00 - F02B37/00
- F02B39/02—Drives of pumps; Varying pump drive gear ratio
- F02B39/08—Non-mechanical drives, e.g. fluid drives having variable gear ratio
- F02B39/10—Non-mechanical drives, e.g. fluid drives having variable gear ratio electric
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/30—Structural association with control circuits or drive circuits
- H02K11/33—Drive circuits, e.g. power electronics
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Supercharger (AREA)
Abstract
The present invention relates to combustion engine technology field more particularly to a kind of supercharging devices for combustion engine.It includes the electrically-driven compressors (1) with compressor housing (2), is equipped with compressor wheels (3) in the compressor housing (2), the compressor housing (2) has the compressor housing rear wall (5) adjacent on rear side of compressor wheels (3)；It further includes motor (6), and the motor (6) has electric machine casing (7)；It further includes power electronic circuit (8), and the power electronic circuit (8) is arranged between the compressor housing rear wall (5) and electric machine casing (7)；The electric machine casing (7) is equipped with cooling duct (9), and the inlets or outlets of the cooling duct (9) are by the top of heating region (11) on power electronic circuit (8).This supercharging device realizes that convenient, cost of implementation is lower and cooling and cooling effect is preferable.
Description
Technical field
The present invention relates to combustion engine technology field more particularly to a kind of supercharging devices for combustion engine.
Background technique
Combustion engine is a kind of machine for converting heat into mechanical energy.And have in the prior art in combustion engine
Upper setting supercharging device, but the prior art, such as the Chinese publication of Publication No. CN105308288A, supercharging device will
Power electronic circuit setting is provided between compressor housing rear wall and electric motor, and in compressor housing rear wall
Coolant jacket, but this structure has the disadvantages that
One, cooling is set in compressor housing rear wall first, disengaging coolant liquid is inconvenient；
Two, secondly, it is higher to will lead to processing cost in this way even if realizing the disengaging of coolant liquid in compressor housing rear wall；
Three, finally, the duct of such coolant liquid disengaging also can even if realizing the disengaging of coolant liquid in compressor housing rear wall two sides
Smaller, so that coolant jacket internal coolant flow effect is poor, i.e., heat dissipation effect is poor.
Summary of the invention
The technical problems to be solved by the present invention are: providing, a kind of realization is convenient, cost of implementation is lower and cooling heat dissipation effect
Fruit is preferably used for the supercharging device of combustion engine.
The technical scheme adopted by the invention is that: a kind of supercharging device for combustion engine,
It includes the electrically-driven compressors with compressor housing, and compressor wheels, the compression are equipped in the compression case body
Wheel is mounted on one end of armature spindle, after the compressor housing has the compressor housing adjacent on rear side of compressor wheels
Wall；
It further includes motor, and the motor has electric machine casing；
It further includes power electronic circuit, power electronic circuit setting the compressor housing rear wall and electric machine casing it
Between；
The electric machine casing is equipped with cooling duct, and the inlets or outlets of the cooling duct are by power electronic circuit
The top of heating region.
Preferably, the inlet and outlet channel of the cooling duct is respectively positioned on the top of heating region in power electronic circuit.
Preferably, the heating region is the position of several MOSFET or IGBT in power electronic circuit.
Preferably, being additionally provided with one layer of heat-conducting silicone grease between the MOSFET or IGBT and electric machine casing.
Preferably, the electric machine casing is equipped with the groove being embedded in for MOSFET or IGBT, and the heat-conducting silicone grease is set
It sets in groove.
Preferably, the opening setting of the cooling duct in electric machine casing far from compressor wheels side, and the electricity
The opening of the motor cavity of machine is arranged in electric machine casing close to compressor wheels side, and the opening of the cooling duct passes through channel
Blanking cover sealing.
Preferably, the channel blanking cover is welded by aluminium or stamping parts interference is adhesively fixed on cooling duct and is open
Place.
Preferably, the cooling duct includes the main channel being arranged on the electric machine casing of motor cavity circumference and setting
Inlet and outlet channel on electric machine casing in power electronic circuit above heating region, the motor include stator, and described
The depth of main channel is more than the depth of stator and electric machine casing inner wall contact site.
Preferably, the motor is equipped with stator wire connecting portion, and the stator wire connecting portion passes through bearing block and electric power electricity
Sub-circuit electrical connection, and the stator wire connecting portion and pedestal bearing insulation sealing cooperate.
Using the above structure compared with prior art, the invention has the following advantages that cooling duct is arranged in electricity first
It in casing body, can be very good to radiate in motor cavity in this way, and cooling duct be arranged on electric machine casing, in this way
Process more convenient, and processing cost is relatively low, water channel chamber opening direction and motor cavity be open on the contrary, and on the outside, it is ingenious
Water channel chamber and motor cavity and power electronic circuit accommodating cavity are kept apart, evaded potential seal failure to power electronics electricity
The destruction risk of the core members such as road and motor cavity inner stator, significantly improves the reliability of product；The heat of power electronic circuit
Several powerful MOSFET or IGBT are mainly derived from, therefore the inlet and outlet of cooling duct is arranged near electricity
Above the heating region of power electronic circuit, the heat that heating region generates is led out well, succinct effective realization is to electricity
The cooling of power electronic circuit, so that entire supercharging device heat dissipation effect is preferable, technique production is simple, low in cost.
Import and outlet are arranged to the top of heating region, can preferably give the fever of power electronic circuit in this way
It radiates in region.
Because the MOSFET or IGBT in general power electronic circuit are the regions of fever most serious, by this position
It is more actual as heating region, and can preferably radiates to power electronic circuit.
Heat-conducting silicone grease is set between MOSFET or IGBT and electric machine casing, it can the heat for allowing MOSFET or IGBT to distribute
Amount is quickly transmitted on electric machine casing, is then shed by cooling duct, and heat-conducting silicone grease can also be by MOSFET or IGBT
It carries out between electric machine casing every electricity.
Because MOSFET or IGBT generally protrude from circuit board surface, groove is set on electric machine casing, and
Conducting resinl is set in groove, is arranged so more convenient, and it is also preferable every electric effect to radiate.
In two directions with the setting of motor cavity opening by cooling duct opening, accordingly even when cooling duct opening is let out
Leakage, will not enter in motor cavity influences the normal work of motor, and because power electronic circuit is arranged in motor casing
Between body and compressor housing rear wall, that is, also corresponding to for being open cooling duct is arranged with power electronic circuit in both direction
On, coolant liquid also can be effectively prevented and enter in cavity locating for power electronic circuit the normal work for influencing power electronic circuit
Make.
Channel blanking cover is fixed using aluminium welding or stamping parts interference bonding, is fixed in this way than stronger, sealing effect
Fruit is preferable.
The depth of main channel is done deep, the position that stator is contacted with electric machine casing, energy can be completely covered in this way
It preferably realizes and cools down to motor (especially motor stator).
Stator wire connecting portion and bearing block are subjected to insulated enclosure, can prevent stator wire connecting portion from passing through in high current first in this way
When the potential risk of electric arc is generated with bearing block, and can prevent stator wire connecting portion and bearing block from scraping collision occurs during installation.
Detailed description of the invention
Fig. 1 is cross-sectional view of the present invention for the supercharging device of combustion engine.
Fig. 2 is the schematic diagram that the present invention imports and exports position for the cooling duct of the supercharging device of combustion engine.
Fig. 3 is to hide the schematic diagram after a part of electric machine casing in Fig. 2.
It is as shown in the figure: 1, electrically-driven compressors；2, compressor housing；3, compressor wheels；4, armature spindle；5, compressor housing
Rear wall；6, motor；7, electric machine casing；8, power electronic circuit；9, cooling duct；10, channel is imported and exported；11, heating region；
12, heat-conducting silicone grease；13, groove；14, motor cavity；15, channel blanking cover；16, bearing block；17, rotor；18, stator wire connecting portion；19,
Main channel；20, stator.
Specific embodiment
The present invention is described further below in conjunction with attached drawing and specific embodiment, but the present invention be not limited only to it is following
Specific embodiment.
A kind of supercharging device for combustion engine as shown in Figure 1:, including electrically-driven compressors 1, electrically-driven compressors
1 includes compressor housing 2, is provided with compressor wheels 3 in compressor housing 2, compressor wheels 3 are mounted on one end of armature spindle 4.
There is compressor housing rear wall 5 in compressor housing 2, be in the shown embodiment the form of compressor housing cover.
And as shown in Figure 1, supercharging device further includes motor 6, motor 6 can use permanent magnet synchronous motor, set on motor 6
It is equipped with electric machine casing 7, stator 20 and rotor 17, electric machine casing 7 is referred to as stator case, and electric machine casing 7 can be with pressure
What contracting machine housing rear 5 connected, or directly connect with compressor housing 2, compressor housing rear wall 5 be clipped in electric machine casing 7 and
Between compressor housing 2；And there is setting power electronic circuit accommodating cavity between electric machine casing 7 and compressor housing rear wall 5,
Power electronic circuit is arranged in power electronic circuit accommodating cavity, and armature spindle 4 is a part of rotor, armature spindle 4
On be additionally provided with a pair of bearings, left end bearing is arranged on electric machine casing 7, and right end Bearing outer is provided with bearing block 16, and
As shown in Figure 1, bearing block 16 is connect with compressor housing rear wall 5.
In this embodiment, electric machine casing 7 is internally provided with cooling duct 9, and cooling duct 9 includes main channel
19 and inlet and outlet channel 10, as shown in Fig. 2, wherein main channel 19 is arranged on the electric machine casing 7 of 14 circumference of motor cavity,
And the position of main channel 19 can be set in close 14 1 points of motor cavity, and import and export the import that channel 10 includes cooling duct
And outlet, they are positioned close on the electric machine casing 7 in power electronic circuit 8 near heating region 11, can be one
A import or one outlet setting, can also both be respectively provided with, be further setting right above heating region 11, and
In this embodiment, the heating region 11 above power electronic circuit 8 is primarily referred to as MOSFET or IGBT or power tube is set
The region set, as shown in figure 3, so the inlet and outlet of cooling duct is arranged at heating region by the application specific embodiment
On the electric machine casing 7 of 11 tops.
And the depth of main channel 19 is the depth more than stator 20 and 7 inner wall contact site of electric machine casing in the application,
It, preferably will be on stator 20 i.e. as shown in Figure 1, the position that stator 20 is contacted with electric machine casing 7 can be completely covered in main channel 19
Heat transfer to main channel 19 in radiate.
It is internally provided with motor cavity 14 in motor 6, stator 20 and rotor are arranged in motor cavity 14, and this is specific real
It applies in example the opening of motor cavity 14 and is directed towards 3 direction of compressor wheels, and the opening of main channel 19 is with motor cavity 14 towards phase
Instead, position is distributed over the both ends of motor 6 both in this way, and because power electronic circuit accommodating cavity is also to be positioned close to electricity
14 aperture position of machine cavity, that is, by the opening of main channel 19 and motor cavity be open and power electronic circuit accommodating cavity every
It opens, even if 19 opening of main channel has leakage in cooling duct 9, motor cavity 14 will not be flowed to or power electronic circuit is held
It sets intracavitary portion to go, greatly reduces many security risks.
And the opening of main channel 19 is additionally provided with channel blanking cover 15 and is sealed in the application.Channel blanking cover 15 can be with
It is that 19 opening of main channel is fixed on by stamping parts interference fit outside plus painting sealant, channel blanking cover 15 can also be used
Aluminum material is made, and because electric machine casing 7 is also that thus can directly weld channel blanking cover 15 using made of aluminum material
The opening in main channel 19 is connect, both modes can fix channel blanking cover well, realize the sealing of main channel 19.
It is real also to need to be arranged heat-conducting silicone grease 12 between the heating region 11 in power electronic circuit 8 and electric machine casing 7
It is existing it is thermally conductive with every being electrically insulated, it is and as shown in Figure 1, moreover it is possible to see and be additionally provided at compressor housing rear wall 5 in electric machine casing 7
Some grooves 13 because MOSFET or IGBT some can protrude circuit board, these grooves 13 are arranged on electric machine casing 7 can
To be just embedded in for MOSFET or IGBT, and heat-conducting silicone grease 12 is additionally provided between MOSFET or IGBT and electric machine casing 7,
Flash heat transfer can be realized by heat-conducting silicone grease 12 and every electricity.
And because compressor is electrically-driven compressors 1, it can be provided on motor 6 and be carried out with power electronic circuit 8
The stator wire connecting portion 18 of electrical connection, stator wire connecting portion 18 are needed across bearing block 16, by stator wire connecting portion and bearing block into
Row insulated enclosure can prevent stator wire connecting portion from generating the potential risk of electric arc with bearing block when high current passes through first in this way,
And it can prevent stator wire connecting portion and bearing block from scraping collision occurs during installation.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, it will be understood by those of skill in the art that it still can be right
Technical solution documented by previous embodiment is modified, or is replaced on an equal basis to part of technical characteristic；And these
It modifies or replaces, the essence of corresponding technical solution is not made to be detached from the spirit and model of technical solution of various embodiments of the present invention
It encloses.
Claims (9)
1. a kind of supercharging device for combustion engine,
It includes the electrically-driven compressors (1) with compressor housing (2), is equipped with compressor wheels in the compressor housing (2)
(3), the compressor wheels (3) are mounted on one end of armature spindle (4), and the compressor housing (2) has and compressor wheels (3)
The adjacent compressor housing rear wall (5) of rear side；
It further includes motor (6), and the motor (6) has electric machine casing (7)；
It further includes power electronic circuit (8), the power electronic circuit (8) setting the compressor housing rear wall (5) with
Between electric machine casing (7)；
It is characterized by:
The electric machine casing (7) is equipped with cooling duct (9), and the inlets or outlets of the cooling duct (9) pass through electric power
The top of heating region (11) on electronic circuit (8).
2. the supercharging device according to claim 1 for combustion engine, it is characterised in that: the cooling duct (9)
Inlet and outlet channel (10) be respectively positioned on the top of heating region (11) on power electronic circuit (8).
3. the supercharging device according to claim 1 for combustion engine, it is characterised in that: the heating region (11)
For the position of several MOSFET or IGBT in power electronic circuit.
4. the supercharging device according to claim 3 for combustion engine, it is characterised in that: the MOSFET or IGBT
One layer of heat-conducting silicone grease (12) is additionally provided between electric machine casing (7).
5. the supercharging device according to claim 4 for combustion engine, it is characterised in that: the electric machine casing (7)
It is equipped with the groove (13) being embedded in for MOSFET or IGBT, and the heat-conducting silicone grease (12) setting is in groove (13).
6. the supercharging device according to claim 1 for combustion engine, it is characterised in that: the cooling duct (9)
Opening setting in electric machine casing (7) far from compressor wheels (3) side, and the opening of the motor cavity (14) of the motor (6)
Setting is in electric machine casing (7) close compressor wheels (3) side, and the opening of the cooling duct (9) passes through channel blanking cover
(15) it seals.
7. the supercharging device according to claim 6 for combustion engine, it is characterised in that: the channel blanking cover (15)
Cooling duct (9) opening is adhesively fixed on by aluminium welding or stamping parts interference.
8. the supercharging device according to claim 1 for combustion engine, it is characterised in that: the cooling duct (9)
Main channel (19) and the setting heating region in power electronic circuit on electric machine casing including motor cavity circumference is arranged in
Inlet and outlet channel (10) on the electric machine casing of top, the motor (6) include stator (20), and the depth of the main channel (19)
Degree is more than the depth of stator (20) and electric machine casing (7) inner wall contact site.
9. the supercharging device according to claim 1 for combustion engine, it is characterised in that: set on the motor (6)
Have stator wire connecting portion (18), and the stator wire connecting portion (18) passes through bearing block (16) and is electrically connected with power electronic circuit (8), and
The stator wire connecting portion (18) and bearing block (16) insulated enclosure cooperate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811373257.6A CN109441621A (en) | 2018-11-19 | 2018-11-19 | Supercharging device for combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811373257.6A CN109441621A (en) | 2018-11-19 | 2018-11-19 | Supercharging device for combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109441621A true CN109441621A (en) | 2019-03-08 |
Family
ID=65553820
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811373257.6A Pending CN109441621A (en) | 2018-11-19 | 2018-11-19 | Supercharging device for combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109441621A (en) |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080185924A1 (en) * | 2007-02-01 | 2008-08-07 | Honeywell International Inc. | Electric motor cooling jacket |
| US20100266430A1 (en) * | 2007-07-09 | 2010-10-21 | Ihi Corporation | Turbocharger with electric motor |
| CN102943707A (en) * | 2012-10-22 | 2013-02-27 | 安徽中鼎动力有限公司 | Electrically controlled turbocharger |
| US20140144412A1 (en) * | 2011-07-15 | 2014-05-29 | Mitsubishi Heavy Industries, Ltd. | Electric supercharging device and multi-stage supercharging system |
| CN104145099A (en) * | 2012-02-17 | 2014-11-12 | 博格华纳公司 | Multi-segment turbocharger bearing housing and methods therefor |
| CN104736814A (en) * | 2012-11-22 | 2015-06-24 | 三菱重工业株式会社 | Supercharger with electric motor and engine device provided with supercharger with electric motor |
| CN105308288A (en) * | 2013-06-28 | 2016-02-03 | 博格华纳公司 | Charging apparatus for a combustion engine |
| CN105308289A (en) * | 2013-06-28 | 2016-02-03 | 博格华纳公司 | Supercharging apparatus for a combustion engine |
| WO2017081380A1 (en) * | 2015-11-09 | 2017-05-18 | Valeo Systemes De Controle Moteur | Electric compressor comprising a cooling circuit |
| FR3048033A1 (en) * | 2016-02-21 | 2017-08-25 | Valeo Systemes De Controle Moteur | ELECTRIC COMPRESSOR |
| CN209261666U (en) * | 2018-11-19 | 2019-08-16 | 宁波丰沃涡轮增压系统有限公司 | Supercharging device for combustion engine |
-
2018
- 2018-11-19 CN CN201811373257.6A patent/CN109441621A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080185924A1 (en) * | 2007-02-01 | 2008-08-07 | Honeywell International Inc. | Electric motor cooling jacket |
| US20100266430A1 (en) * | 2007-07-09 | 2010-10-21 | Ihi Corporation | Turbocharger with electric motor |
| US20140144412A1 (en) * | 2011-07-15 | 2014-05-29 | Mitsubishi Heavy Industries, Ltd. | Electric supercharging device and multi-stage supercharging system |
| CN104145099A (en) * | 2012-02-17 | 2014-11-12 | 博格华纳公司 | Multi-segment turbocharger bearing housing and methods therefor |
| CN102943707A (en) * | 2012-10-22 | 2013-02-27 | 安徽中鼎动力有限公司 | Electrically controlled turbocharger |
| CN104736814A (en) * | 2012-11-22 | 2015-06-24 | 三菱重工业株式会社 | Supercharger with electric motor and engine device provided with supercharger with electric motor |
| CN105308288A (en) * | 2013-06-28 | 2016-02-03 | 博格华纳公司 | Charging apparatus for a combustion engine |
| CN105308289A (en) * | 2013-06-28 | 2016-02-03 | 博格华纳公司 | Supercharging apparatus for a combustion engine |
| WO2017081380A1 (en) * | 2015-11-09 | 2017-05-18 | Valeo Systemes De Controle Moteur | Electric compressor comprising a cooling circuit |
| FR3048033A1 (en) * | 2016-02-21 | 2017-08-25 | Valeo Systemes De Controle Moteur | ELECTRIC COMPRESSOR |
| CN209261666U (en) * | 2018-11-19 | 2019-08-16 | 宁波丰沃涡轮增压系统有限公司 | Supercharging device for combustion engine |
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