CN102767416B - Electromagnetically-controlled driving device of engine cooling fan and implementation method of electromagnetically-controlled driving device - Google Patents
Electromagnetically-controlled driving device of engine cooling fan and implementation method of electromagnetically-controlled driving device Download PDFInfo
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- CN102767416B CN102767416B CN201210260004.4A CN201210260004A CN102767416B CN 102767416 B CN102767416 B CN 102767416B CN 201210260004 A CN201210260004 A CN 201210260004A CN 102767416 B CN102767416 B CN 102767416B
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Abstract
The invention discloses an electromagnetically-controlled driving device of an engine cooling fan. The electromagnetically-controlled driving device comprises a shaft, a first bearing, a second bearing, a coil, a rotor, a belt pulley, a fan nonlinear speed regulation module, a driven disc, a mounting flange, a one-way clutch decoupling wheel, a fan and an electronic control element. The invention further provides an implementation method of the electromagnetically-controlled driving device of the engine cooling fan. The problems of proneness to relative slip, complexity in structure, proneness to high-temperature failure and fan blade breakage, poor engine working reliability, high belt wear, high produced noise and the like in the prior art are solved, and the electromagnetically-controlled driving device of the engine cooling fan has the advantages of simple structure, high control precision, fast response, low vibration, low noise, nonlinear speed regulation, vibration reduction and the like.
Description
Technical field
The present invention relates to motor car engine heat management system technology, is a kind of Electromagnetic Control cooling fan of engine drive unit and its implementation specifically.
Background technique
According to relevant research data, show, the energy consumption of motor car engine 5 ~ 10% is on the cooling fan of motor.The energy losing on cooling fan comprises: the vibration loss in (1), fan running; (2), frictional loss in fan running etc.Electromagnetic Control cooling fan of engine one-way clutch decoupling zero wheel can well solve the vibration problem of fan in running; Non-linear speed adjusting module can, according to engine operating condition, regulate cooling fan of engine rotating speed, energy saving.From saving energy source of car, consider, automobile cooling fan should be according to the heat load working condition requirement of motor car engine, and on the one hand, fan rotates when engine heat load is larger, thereby is engine radiating; On the other hand, engine operating temperature is lower or when normal working temperature, fan should stop the rotation, to prevent that motor from moving under supercooled operating mode.Therefore, the automatic clutch technology of automobile engine cooling fan becomes one of key technology of vehicle energy saving.
Engaging and disengaging gear is realized in conjunction with separation according to tribology principle, conventionally can realize clutch by modes such as machinery, air pressure, hydraulic pressure and electromagnetism.General engine blower is positioned on the independent bearing journal of motor head, the fan clutch that utilizes air pressure and Electromagnetic Control to realize clutch has a belt pulley conventionally, can utilize band transmission to drive, the bearing of belt pulley has a non rotatable bearing journal conventionally.
Between the silicon oil clutch principal and subordinate Moving plate of traditional drive fan, exist relatively trackslip, shortcoming that complex structure and high temperature easily lost efficacy.And the dry friction fan clutch of employing Electromagnetic Control, by controlling the size of electric current in electromagnetic coil, carries out non-linear, accurately control to frictional force, and arrange relatively easy; In assembling, the belt pulley of drive fan is first installed, then rubbing device is installed, then install with one-way clutch and decoupling device driven disc, reverse during dismounting.This assemble sequence has advantages of that dismounting is easy, for ease of maintenaince.
Cooling fan of engine is high-speed rotary part, and blade there will be larger vibration.If fan hub is direct and running shaft is rigidly connected, this vibration will be directly delivered on running shaft, and then affects the vibration of whole motor head accessory drive system.When serious vibration, can make fan blade fracture, occur breaking the situation of radiator, thereby affect the reliability of engine operation.In addition; its equivalent moment of inertia of the fan of High Rotation Speed is larger; if fan hub is direct and running shaft is rigidly connected; when motor is anxious, slows down or shut down moment; fan is still with larger rotating speed rotation; this is by the relative sliding increasing between band and wheel, thus the problems such as the wearing and tearing of aggravation belt, generation noise.
Summary of the invention
The object of the invention is to overcome the deficiency that above prior art exists, a kind of simple in structure, control accuracy is high, response is fast, it is little to vibrate, noise is low Electromagnetic Control cooling fan of engine drive unit with non-linear speed governing and damping effect is provided.
Another object of the present invention is to provide a kind of implementation method of Electromagnetic Control cooling fan of engine drive unit.
In order to achieve the above object, the present invention is by the following technical solutions: a kind of Electromagnetic Control cooling fan of engine drive unit, comprise the clutch shaft bearing and the second bearing that are set on axle, the outside sheathed coil of clutch shaft bearing, coil outside is provided with rotor, rotor exterior arranges belt pulley, belt pulley exterior edge face inner and rotor arranges the non-linear speed adjusting module of fan, the non-linear speed adjusting module of fan exterior edge face arranges driven disc, driven disc is set on the second bearing, driven disc outer end arranges mounting flange, the affixed one-way clutch decoupling zero wheel of mounting flange one end face, one-way clutch decoupling zero wheel other end and fan mounting flange are affixed, fan mounting flange is connected with fan, coil is connected with electronic control component.
As the preferred structure of one, the non-linear speed adjusting module of described fan comprises transmission pin, key, armature, spring, logical disk, spacer ring, friction disk and magnet; Wherein, armature is set on rotor, and belt pulley connects armature carry-over moment by key, armature is closely connected by transmission pin with spring, logical disk and spacer ring, and spacer ring exterior edge face arranges friction disk, and spacer ring and friction disk are provided with through hole, magnet is set in through hole, and magnet is connected with logical disk.
As the preferred structure of one, described one-way clutch decoupling zero wheel comprises overrunning clutch, Arc Spring and Arc Spring mounting disc; Wherein, Arc Spring mounting disc and mounting flange are affixed, in Arc Spring mounting disc, Arc Spring are installed, and Arc Spring is connected with overrunning clutch and Arc Spring mounting disc by housing.
As the preferred structure of one, described axle is multidiameter shaft.
In order to strengthen radiating effect, described driven disc one end face is provided with radiating fin.
An implementation method for Electromagnetic Control cooling fan of engine drive unit, comprises the following steps:
(1), by electronic control component, gather the information of predefined parameter, and be converted into electrical signal through editor's program;
(2), the size of current transmitted according to electronic control component of coil, the magnetic field that produces corresponding size, magnetic field produces magnetic attraction armature through rotor;
(3), armature moves along belt pulley axis direction to belt pulley one side under the effect of electromagnetic force, thereby control logical disk, is applied to the impacting force on spacer ring;
(4), the size of spacer ring impacting force has been controlled the size of frictional force between friction disk and driven disc, thereby has been regulated the height of driven disc rotating speed;
(5), when the frictional force between friction disk and driven disc becomes large, driven disc can drive fan High Rotation Speed; When the frictional force between friction disk and driven disc diminishes, fan is just worked under slow-speed of revolution operating mode;
(6), when the rotating speed of belt pulley is greater than the rotating speed of fan, now overrunning clutch is in bonding state, belt pulley drives fan to rotate together; When the rotating speed of belt pulley is during lower than the rotating speed of fan, overrunning clutch is in separated state, and fan can rotate freely, and now the fan of High Rotation Speed can anti-drive pulley, can not cause relative sliding larger between belt pulley and belt yet.
Described step (1) electronic control component gathers the information of predefined parameter, comprises engine operating temperature, the speed of a motor vehicle, ambient temperature and radiator temperature.
Described step (4) comprising:
(4-1), when friction disk is when driven disc is combined, the powerful impact force that Arc Spring buffering friction disk produces while engaging suddenly with driven disc, if the rotating speed of belt pulley is greater than the rotating speed of fan, now overrunning clutch is in bonding state, and belt pulley drives fan to rotate together;
(4-2), when motor is anxious, slows down or shut down; the rotating speed of belt pulley is during lower than the rotating speed of fan, and overrunning clutch is in separated state, and fan can rotate freely; now the fan of High Rotation Speed can anti-drive pulley, can not cause relative sliding larger between belt pulley and belt yet.
The principle that realizes of the present invention:
A kind of Electromagnetic Control cooling fan of engine drive unit, comprise the clutch shaft bearing and the second bearing that are set on axle, the outside sheathed coil of clutch shaft bearing, coil outside is provided with rotor, rotor exterior arranges belt pulley, belt pulley exterior edge face inner and rotor arranges the non-linear speed adjusting module of fan, the non-linear speed adjusting module of fan exterior edge face arranges driven disc, driven disc is set on the second bearing, driven disc outer end arranges mounting flange, the affixed one-way clutch decoupling zero wheel of mounting flange one end face, one-way clutch decoupling zero wheel other end and fan mounting flange are affixed, fan mounting flange is connected with fan, coil is connected with electronic control component.
Electronic control component gathers the information of predefined parameter, and be converted into electrical signal through editor's program, then according to size of current, produce magnetic field, attract armature, the pressure acting on spring changes, thereby control logical disk and be applied to the impacting force on spacer ring, the size of spacer ring impacting force has been controlled the size of frictional force between friction disk and driven disc, when frictional force is enough large, driven disc can drive fan High Rotation Speed, when frictional force hour, fan is just worked under slow-speed of revolution operating mode, when the rotating speed of belt pulley is greater than the rotating speed of fan, now overrunning clutch is in bonding state, belt pulley drives fan to rotate together, when the rotating speed of belt pulley is during lower than the rotating speed of fan, overrunning clutch is in separated state, and fan can rotate freely, and now the fan of High Rotation Speed can anti-drive pulley, can not cause relative sliding larger between belt pulley and belt yet.
The present invention, with respect to prior art, has following advantage and effect:
1, the present invention has adopted and has comprised the clutch shaft bearing and the second bearing that are set on axle, the outside sheathed coil of clutch shaft bearing, coil outside is provided with rotor, rotor exterior arranges belt pulley, belt pulley exterior edge face inner and rotor arranges the non-linear speed adjusting module of fan, the non-linear speed adjusting module of fan exterior edge face arranges driven disc, driven disc is set on the second bearing, mounting flange is set on driven disc, mounting flange connects one-way clutch decoupling zero wheel, one-way clutch decoupling zero wheel and fan mounting flange are affixed, fan mounting flange is connected with fan, coil is connected with electronic control component signal, have simple in structure, control accuracy is high, response is fast, vibrate little, noise is low has the features such as non-linear speed governing and damping effect.
2, the armature in the present invention moves along belt pulley axis direction to belt pulley one side under the effect of electromagnetic force, thereby control logical disk, is applied to the impacting force on spacer ring; The size of spacer ring impacting force has been controlled the size of frictional force between friction disk and driven disc, thereby regulates the height of driven disc rotating speed, therefore, has non-linear speed-regulating function.
If 3, motor is anxious in the present invention, slows down or shut down; the rotating speed of belt pulley is during lower than the rotating speed of fan; overrunning clutch is in separated state; fan can rotate freely; now the fan of High Rotation Speed can anti-drive pulley; also can not cause relative sliding larger between belt pulley and belt, this has just effectively reduced the friction between belt pulley and belt, improves the working life of belt and reduces the frictional noise between band-wheel.
4, the Arc Spring in the present invention has buffer function, and the powerful impact force producing in the time of can cushioning friction disk and engage suddenly with driven disc, makes the smooth running of fan energy.
5, mate the rigidity of suitable Arc Spring, can be by the vibration of large rotating inertia fan and motor head accessory drive system each take turns and the vibration uncoupling of belt, thereby blade vibration and the impact on motor head accessory drive system thereof while reducing fan rotation.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram of a kind of Electromagnetic Control cooling fan of engine of the present invention drive unit;
Fig. 2 is the local structure for amplifying schematic diagram of the non-linear speed adjusting module of a kind of Electromagnetic Control cooling fan of engine of the present invention drive unit fan;
Fig. 3 is that in a kind of Electromagnetic Control cooling fan of engine of the present invention drive unit, local structure for amplifying schematic diagram is taken turns in one-way clutch decoupling zero.
Number in the figure and title are as follows:
| 1 | Axle | 2 | Clutch shaft bearing |
| 3 | The second bearing | 4 | |
| 5 | |
6 | |
| 7 | The non-linear speed adjusting module of |
8 | |
| 9 | |
10 | One-way clutch decoupling zero |
| 11 | |
12 | |
| 13 | |
14 | |
| 15 | |
16 | |
| 17 | |
18 | |
| 19 | |
20 | |
| 21 | Overrunning |
22 | Arc Spring |
| 23 | Arc |
24 | |
| 25 | Radiating fin |
Embodiment
For ease of it will be appreciated by those skilled in the art that the present invention is described in further detail below in conjunction with drawings and Examples.
Embodiment 1:
As shown in Fig. 1 ~ 3, a kind of Electromagnetic Control cooling fan of engine drive unit, comprise the clutch shaft bearing 2 and the second bearing 3 that are set on axle 1, the outside sheathed coil 4 of clutch shaft bearing 1, coil 4 outsides are provided with rotor 5, rotor 5 outer installment belt pulleys 6, belt pulley 6 exterior edge face inner and rotor 5 arranges the non-linear speed adjusting module 7 of fan, the non-linear speed adjusting module of fan 7 exterior edge faces arrange driven disc 8, driven disc 8 is set on the second bearing 3, driven disc 8 outer ends arrange mounting flange 9, the affixed one-way clutch decoupling zero wheel 10 of mounting flange 9 one end face, 10 other ends are taken turns in one-way clutch decoupling zero and fan mounting flange 11 is affixed, fan mounting flange 11 is connected with fan 12, coil 4 is connected with electronic control component 13.In the present embodiment, the Placement of mounting flange 9 and fan mounting flange 11 is to connect with bolt, and the parts up and down in Fig. 1 are symmetrical up and down along central shaft.
The non-linear speed adjusting module 7 of described fan comprises transmission pin, key 14, armature 15, spring 16, logical disk 17, spacer ring 18, friction disk 19 and magnet 20; Wherein, armature 15 is set on rotor 5, and belt pulley 6 connects armature 15 carry-over moment by key 14, armature 15 is closely connected by transmission pin with spring 16, logical disk 17 and spacer ring 18, spacer ring 18 exterior edge faces arrange friction disk 19, spacer ring 18 and friction disk 19 are provided with through hole, and magnet 20 is set in through hole, and magnet 20 is connected with logical disk 17.
The working principle of the non-linear speed adjusting module 7 of fan is: by electronic control component 13, gathered the various information (comprising engine operating temperature, the speed of a motor vehicle, ambient temperature and radiator temperature etc.) of predefined parameter, through editor's program, be converted into electrical signal; The size of current that coil 4 transmits according to electronic control component 13, the magnetic field that produces corresponding size, magnetic field produces magnetic attraction armature 15 through rotor 5; Armature 15 moves along belt pulley 6 axial directions to belt pulley 6 one sides under the effect of electromagnetic force, thereby control logical disk 17, is applied to the impacting force on spacer ring 18; The size of spacer ring 18 impacting forces has been controlled the size of frictional force between friction disk 19 and driven disc 8, thereby regulates the height of driven disc 8 rotating speeds.Therefore, this fan drive device has non-linear speed-regulating function.
When electronic control component 13 break down and coil no current by time, friction disk 19 and driven disc 8 can be in normal bonding states, thereby guarantee that belt pulley 6 can rotate by driven fans 12, and avoid motor car engine to move under the operating mode of heat load overload.
Described one-way clutch decoupling zero wheel 10 comprises overrunning clutch 21, Arc Spring 22 and Arc Spring mounting disc 23; Wherein, Arc Spring mounting disc 23 is affixed with mounting flange 9, and Arc Spring 22 is installed in Arc Spring mounting disc 23, and Arc Spring 22 is connected with overrunning clutch 21 and Arc Spring mounting disc 23 by housing 24.
One-way clutch decoupling zero wheel working principle is: the first, friction disk 19 and driven disc 8 in conjunction with time, if the rotating speed of belt pulley 6 is greater than the rotating speed of fan 12, now overrunning clutch 21 is in bonding state, belt pulley 6 drives fan 12 to rotate together.Second; if motor is anxious, slows down or shut down; the rotating speed of belt pulley 6 is during lower than the rotating speed of fan 12; overrunning clutch 21 is in separated state; fan 12 can rotate freely; now the fan of High Rotation Speed can anti-drive pulley 6, can not cause relative sliding larger between belt pulley 6 and belt yet.This has just effectively reduced the friction between belt pulley 6 and belt, improves the working life of belt and reduces the frictional noise between band-wheel.The 3rd, Arc Spring 22 has buffer function, can cushion the powerful impact force producing when friction disk 19 engages suddenly with driven disc 8, guarantees that fan 12 can smooth running.The 4th, mate the rigidity of suitable Arc Spring 22, can be by the vibration of large rotating inertia fan and motor head accessory drive system each take turns and the vibration uncoupling of belt, thereby blade vibration and the impact on motor head accessory drive system thereof when reducing fan 12 and rotating.
An implementation method for Electromagnetic Control cooling fan of engine drive unit, comprises the following steps:
(1), by electronic control component 13, gather the information of predefined parameter, and be converted into electrical signal through editor's program;
(2), the size of current transmitted according to electronic control component 13 of coil 4, the magnetic field that produces corresponding size, magnetic field produces magnetic attraction armature 15 through rotor 5;
(3), armature 15 moves along belt pulley 6 axial directions to belt pulley 6 one sides under the effect of electromagnetic force, thereby control logical disk 17, is applied to the impacting force on spacer ring 18;
(4), the size of spacer ring 18 impacting forces has been controlled the size of frictional force between friction disk 19 and driven disc 8, thereby has been regulated the height of driven disc 8 rotating speeds;
(5), when the frictional force between friction disk 19 and driven disc 8 becomes large, driven disc 8 can drive fan 12 High Rotation Speeds; When the frictional force between friction disk 19 and driven disc 8 diminishes, fan 12 is just worked under slow-speed of revolution operating mode;
(6), when the rotating speed of belt pulley 6 is greater than the rotating speed of fan 12, now overrunning clutch 21 is in bonding state, belt pulley 6 drives fan 12 to rotate together; When the rotating speed of belt pulley 6 is during lower than the rotating speed of fan 12, overrunning clutch 21 is in separated state, and fan 12 can rotate freely, and now the fan 12 of High Rotation Speed can anti-drive pulley, can not cause relative sliding larger between belt pulley 6 and belt yet.
Generally rotation speed of the fan is that 600 ~ 1200r/min is called low speed rotation, and 1200 ~ 3000r/min is called High Rotation Speed.
Described step (1) electronic control component 13 gathers the information of predefined parameter, comprises engine operating temperature, the speed of a motor vehicle, ambient temperature and radiator temperature.
Described step (4) comprising:
(4-1), when friction disk 19 and driven disc 8 in conjunction with time, Arc Spring 22 cushions the powerful impact force producing when friction disk 19 engages suddenly with driven disc 8, if the rotating speed of belt pulley 6 is greater than the rotating speed of fan 12, now overrunning clutch 21 is in bonding state, and belt pulley 6 drives fan 12 to rotate together;
(4-2), when motor is anxious, slows down or shut down; the rotating speed of belt pulley 6 is during lower than the rotating speed of fan 12; overrunning clutch 21 is in separated state; fan 12 can rotate freely; now the fan 12 of High Rotation Speed can anti-drive pulley 6, can not cause relative sliding larger between belt pulley 6 and belt yet.
When under the even accelerating mode of motor (1000r/min ~ 5500r/min), install after one-way clutch decoupling zero wheel 10, in the fluctuation of speed of whole engine speed range internal fan 12, all reduce; Engine speed is within the scope of 1000 ~ 2000r/min, and the fluctuation of speed of fan 12 reduces more than 50%.This shows to increase one-way clutch decoupling zero wheel 10, and by large rotating inertia fan 12 and motor head accessory drive system, each takes turns and the vibration uncoupling of belt Arc Spring 22, thereby has reduced the vibration of fan 12 and motor head accessory drive system.
Above-mentioned embodiment is the preferred embodiments of the present invention, can not limit the present invention, and other any change or other equivalent substitute mode that does not deviate from technological scheme of the present invention and make, within being included in protection scope of the present invention.
Claims (8)
1. an Electromagnetic Control cooling fan of engine drive unit, it is characterized in that: comprise the clutch shaft bearing and the second bearing that are set on axle, the outside sheathed coil of clutch shaft bearing, coil outside is provided with rotor, rotor exterior arranges belt pulley, belt pulley exterior edge face inner and rotor arranges the non-linear speed adjusting module of fan, the non-linear speed adjusting module of fan exterior edge face arranges driven disc, driven disc is set on the second bearing, driven disc outer end arranges mounting flange, the affixed one-way clutch decoupling zero wheel of mounting flange one end face, one-way clutch decoupling zero wheel other end and fan mounting flange are affixed, fan mounting flange is connected with fan, coil is connected with electronic control component.
2. Electromagnetic Control cooling fan of engine drive unit according to claim 1, is characterized in that: the non-linear speed adjusting module of described fan comprises transmission pin, key, armature, spring, logical disk, spacer ring, friction disk and magnet; Wherein, armature is set on rotor, and belt pulley connects armature carry-over moment by key, armature is closely connected by transmission pin with spring, logical disk and spacer ring, and spacer ring exterior edge face arranges friction disk, and spacer ring and friction disk are provided with through hole, magnet is set in through hole, and magnet is connected with logical disk.
3. Electromagnetic Control cooling fan of engine drive unit according to claim 1, is characterized in that: described one-way clutch decoupling zero wheel comprises overrunning clutch, Arc Spring and Arc Spring mounting disc; Wherein, Arc Spring mounting disc and mounting flange are affixed, in Arc Spring mounting disc, Arc Spring are installed, and Arc Spring is connected with overrunning clutch and Arc Spring mounting disc by housing.
4. Electromagnetic Control cooling fan of engine drive unit according to claim 1, is characterized in that: described axle is multidiameter shaft.
5. Electromagnetic Control cooling fan of engine drive unit according to claim 1, is characterized in that: described driven disc one end face is provided with radiating fin.
6. an implementation method for the Electromagnetic Control cooling fan of engine drive unit as described in claim 1～5 any one, is characterized in that, comprises the following steps:
(1), by electronic control component, gather the information of predefined parameter, and be converted into electrical signal through editor's program;
(2), the size of current transmitted according to electronic control component of coil, the magnetic field that produces corresponding size, magnetic field produces magnetic attraction armature through rotor;
(3), armature moves along belt pulley axis direction to belt pulley one side under the effect of electromagnetic force, thereby control logical disk, is applied to the impacting force on spacer ring;
(4), the size of spacer ring impacting force has been controlled the size of frictional force between friction disk and driven disc, thereby has been regulated the height of driven disc rotating speed;
(5), when the frictional force between friction disk and driven disc becomes large, driven disc can drive fan High Rotation Speed; When the frictional force between friction disk and driven disc diminishes, fan is just worked under slow-speed of revolution operating mode;
(6), when the rotating speed of belt pulley is greater than the rotating speed of fan, now overrunning clutch is in bonding state, belt pulley drives fan to rotate together; When the rotating speed of belt pulley is during lower than the rotating speed of fan, overrunning clutch is in separated state, and fan can rotate freely, and now the fan of High Rotation Speed can anti-drive pulley, can not cause relative sliding larger between belt pulley and belt yet.
7. the implementation method of Electromagnetic Control cooling fan of engine drive unit according to claim 6, it is characterized in that: described step (1) electronic control component gathers the information of predefined parameter, comprises engine operating temperature, the speed of a motor vehicle, ambient temperature and radiator temperature.
8. the implementation method of Electromagnetic Control cooling fan of engine drive unit according to claim 6, is characterized in that, described step (4) comprising:
(4-1), when friction disk is when driven disc is combined, the powerful impact force that Arc Spring buffering friction disk produces while engaging suddenly with driven disc, if the rotating speed of belt pulley is greater than the rotating speed of fan, now overrunning clutch is in bonding state, and belt pulley drives fan to rotate together;
(4-2), when motor is anxious, slows down or shut down; the rotating speed of belt pulley is during lower than the rotating speed of fan, and overrunning clutch is in separated state, and fan can rotate freely; now the fan of High Rotation Speed can anti-drive pulley, can not cause relative sliding larger between belt pulley and belt yet.
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|---|---|---|---|
| CN201210260004.4A CN102767416B (en) | 2012-07-25 | 2012-07-25 | Electromagnetically-controlled driving device of engine cooling fan and implementation method of electromagnetically-controlled driving device |
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| CN201210260004.4A CN102767416B (en) | 2012-07-25 | 2012-07-25 | Electromagnetically-controlled driving device of engine cooling fan and implementation method of electromagnetically-controlled driving device |
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| CN102767416B true CN102767416B (en) | 2014-04-16 |
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| CN110410192B (en) * | 2019-08-29 | 2024-06-18 | 上海三一重机股份有限公司 | Clutch and engine |
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| CN112081885B (en) * | 2020-09-02 | 2022-02-18 | 一汽解放青岛汽车有限公司 | Fan speed regulating device |
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