CN107738739B - A kind of clutch and the parallel redundancy electromechanical actuator based on clutch realization - Google Patents
A kind of clutch and the parallel redundancy electromechanical actuator based on clutch realization Download PDFInfo
- Publication number
- CN107738739B CN107738739B CN201710827939.9A CN201710827939A CN107738739B CN 107738739 B CN107738739 B CN 107738739B CN 201710827939 A CN201710827939 A CN 201710827939A CN 107738739 B CN107738739 B CN 107738739B
- Authority
- CN
- China
- Prior art keywords
- clutch
- operating bar
- emergency
- shell
- connecting flange
- 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.)
- Active
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H25/00—Steering; Slowing-down otherwise than by use of propulsive elements; Dynamic anchoring, i.e. positioning vessels by means of main or auxiliary propulsive elements
- B63H25/06—Steering by rudders
- B63H25/08—Steering gear
- B63H25/14—Steering gear power assisted; power driven, i.e. using steering engine
- B63H25/26—Steering engines
- B63H25/28—Steering engines of fluid type
- B63H25/30—Steering engines of fluid type hydraulic
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
Abstract
A kind of novel clutch and the parallel redundancy electromechanical actuator based on clutch realization, its structure include main behaviour's connecting flange, the first emergency operating bar, the second emergency operating bar, control surface interface, shell and hydraulic device composition.Main behaviour's connecting flange inner hole and control surface interface thread hole are coaxially arranged in clutch housing two sides, connect respectively with host motor-driven cylinder and operation load.First emergency operating bar and the second emergency operating bar are symmetrically arranged in the two sides of main behaviour's connecting flange, are connect respectively with two sides emergency electromechanical actuator.When main behaviour breaks down, clutch can switch to emergency actuator and operation load connection.The realization of the invention clutch makes it possible that the translation of redundancy electromechanical actuator exports high thrust.Clutch switching time is short, and integrated level is high, substantially increases the reliability of parallel redundancy electromechanical actuator.
Description
Technical field
The present invention relates to a kind of highly reliable redundancy electromechanical actuator clutches of apparel, and in particular to a kind of naval vessel dress
The highly reliable clutch of standby steering movement executing mechanism and the redundancy electromechanical actuator realized based on the clutch.
Background technique
Traditional ship steering control system is hydraulic system, including pump control system and valve control system, and system arrangement is complicated, is existed tight
Shock and vibration again are unfavorable for the vibration and noise reducing of ship.Electromechanical steering engine (EMA) drives skill using alternating-current synchronous torque motor
Art, structure is simple, and high reliablity, maintenance is easy, high-efficient, saves the energy, and vibration noise is low.Therefore the simple, property using structure
The electric steering control system that the reliable clutch of energy is mutually redundant to realize 3EMA, can be improved the security reliability of steering control system,
Make ship more effectively vibration and noise reducing.
Electric steering gear be ship behaviour ship system executing agency, be form ship behaviour ship system important component it
One, the static state and dynamic performance index required according to ship behaviour's ship system control realizes the control to control surface；Electric steering dress
The design principle that should adhere to behaviour's ship system " safety, low noise, efficient, reliable " is set, is set according to security requirement and dissimilar redundancy
Principle is counted, is connected in such a way that main behaviour and emergency behaviour are by clutch.Realize that the clutch of the flatly moving type clutch of heavy load exists
Belong to both at home and abroad and designing for the first time, can be used for reference without successful experience, the design difficulty of clutch is very big.Therefore clutch is reasonable
Structure, layout, principle and scheme are the key that realize redundant electric steering control system.
Summary of the invention
The purpose of the technology of the present invention is: overcome the deficiencies in the prior art proposes a kind of novel clutch, it is intended to realize
There is provided redundancy structure mode for the electromechanical actuator of coplanar parallel arrangement, solve the reasonable general layout of clutch, structure design,
The problems such as mechanical position limitation and stroke adjustment, by realize general requirement clutch using switching in a manner of electronic, switching time≤
5s, and integration degree is improved under the premise of guaranteeing securely and reliably.
The technical solution adopted by the present invention are as follows:
A kind of novel clutch, comprising: the first emergency operating bar, main behaviour's connecting flange, control surface interface, the second emergency are made
Lever, hydraulic device and shell；
The centre side of shell is provided with main behaviour's connecting flange, and the other side is provided with control surface interface.Main behaviour's connection
Cyclic annular card slot is provided on flange, and the ring-type card slot is extend into shell, the first emergency operating bar and the second emergency operating bar
It is mounted on shell, position is symmetrical about main behaviour's connecting flange, is located at shell on the first emergency operating bar and the second emergency operating bar
Intracorporal part is provided with cyclic annular card slot；Hydraulic device is arranged inside housings, with the ring-type being arranged on main behaviour's connecting flange
Card slot, the cyclic annular card slot on the first emergency operating bar and the cyclic annular card slot cooperation on the second emergency operating bar realize that clutch is dynamic
Make.
Control surface interface and main behaviour's connecting flange are coaxial, and control surface interface is hollow cylindrical structure, inside set screw thread, are used for
Connect external loading.
Oil inlet and oil outlet are additionally provided on shell, for hydraulic device pressurising and pressure release.
The axis of first emergency operating bar, the axis of the second emergency operating bar are parallel with main behaviour's axis of connecting flange.
The hydraulic device includes left clutch slider, hydraulic cylinder, piston rod and right clutch slider.
Between hydraulic cylinder and shell, between hydraulic cylinder and piston rod, be dischargeable capacity between piston rod and shell, two
Hydraulic cylinder arrangement symmetrical above and below in bell housing body, hydraulic cylinder and piston rod match work, drive left clutch slider and it is right from
Close sliding block in clutch housing to the left, synchronous slide to the right.
Left clutch slider and right clutch slider within the scope of effective travel, can respectively with the ring that is arranged on main behaviour's connecting flange
Shape card slot, the cyclic annular card slot on the first emergency operating bar and the cyclic annular pocket matches on the second emergency operating bar fit closely.
The hydraulic device further includes that plug is stifled, for limiting in effective travel to hydraulic cylinder and piston rod.
The hydraulic device further includes locking nut, for hydraulic cylinder respectively between left clutch slider and right clutch slider
Be locked, while being also used for piston rod being locked between left clutch slider and right clutch slider respectively.
The effective travel of hydraulic cylinder and piston rod is adjusted by filling in the cooperation of stifled and locking nut.
A kind of parallel redundancy electromechanical actuator realized based on clutch, including clutch, main behaviour's electromechanical actuator, first
Actuator of meeting an urgent need and the second emergency actuator；When main behaviour's electromechanical actuator breaks down, operation is loaded and master by clutch
It grasps electromechanical actuator to disengage, is switched to the first emergency actuator and the second emergency actuator.
Bring has the beneficial effect that the present invention compared with prior art
(1) clutch of the present invention is applied on redundancy electromechanical actuator for the first time, realizes the superfluous of electromechanical actuator (3EMA)
Remaining structure, and can be translatable and export high thrust, integrated level is high, switching time is short, high reliablity.
(2) novel clutch is connected mainly through the connection control surface interface in clutch with outer load, connects with crossing cabin axis
It connects, the material selection precipitation-hardening stainless steel (480 ° of solid solution agings) of control surface interface and shell, tensile strength reaches
1310MPa sufficiently meets load requirement, so that novel clutch has very high reliability.
(3) novel clutch Innerscoping cylinder and piston rod, arrangement symmetrical above and below, clutch slider and clutch housing inner wall
Rationally cooperation, so that the hydraulic coupling (≤0.5MPa) of very little can make novel clutch do switching action, this one small oil pressure is more
Improve the safety and reliability of clutch.
Detailed description of the invention
The actuator schematic diagram of EMA and emergency behaviour's 2EMA parallel redundancy mode are grasped based on Fig. 1；
Fig. 2 is novel clutch outline drawing of the present invention；
Fig. 3 is novel clutch cross-sectional view of the present invention.
Specific embodiment
A specific embodiment of the invention is further described in detail with reference to the accompanying drawing.
What the present invention innovated for the first time has devised 3 EMA by integrated form in parallel, with the translation of redundancy structure mode
Export the clutch configuration of high thrust.So that the electric steering engine translation output high thrust (nominal load of motor driven driving form
30 tons, 60 tons of impact load), clutch switching is rapid, and high reliability is achieved.
As shown in Figure 2,3, the invention proposes a kind of novel clutch, comprising: the first emergency operating bar 1, main behaviour connection
Flange 2, the emergency of control surface interface 3, second operating bar 6, hydraulic device and shell 13.
The centre side of shell 13 is provided with main behaviour's connecting flange 2, and the other side is provided with control surface interface 3, main behaviour
Cyclic annular card slot is provided on connecting flange 2, and the ring-type card slot is extend into shell 13, the first emergency operating bar 1 and second is answered
Anxious operating bar 6 is mounted on shell 13, and position is symmetrical about main behaviour's connecting flange 2, and the first emergency operating bar 1 and the second emergency are made
The part being located in shell 13 in lever 6 is provided with cyclic annular card slot；Hydraulic device is arranged inside shell 13, connects with main behaviour
Cyclic annular card slot, the cyclic annular card slot on the first emergency operating bar 1 and the ring-type on the second emergency operating bar 6 being arranged on flange 2
Clutch switching action is realized in card slot cooperation.
Control surface interface 3 and main behaviour's connecting flange 2 are coaxial, and control surface interface 3 is hollow cylindrical structure, inside set screw thread,
For connecting external loading.Main behaviour's connecting flange 2 moves the connecting flange on device with main operation and is connected by screw to.
Oil inlet 4 and oil outlet 5 are additionally provided on shell 13, for hydraulic device pressurising and pressure release.
The axis of first emergency operating bar 1, the axis of the second emergency operating bar 6 are parallel with main behaviour's axis of connecting flange 2
While guaranteeing that the emergency actuator of two sides can be with synchronism output equidistantly in same plane.
Hydraulic device includes left clutch slider 7, hydraulic cylinder 8, piston rod 9 and right clutch slider 10.
It is each formed between hydraulic cylinder 8 and shell 13, between hydraulic cylinder 8 and piston rod 9, between piston rod 9 and shell 13
Volume is imitated, two hydraulic cylinders 8 are upper and lower in clutch housing 13, are symmetrically arranged, and hydraulic cylinder 8 and piston rod 9 match work,
Drive left clutch slider 7 and right clutch slider 10 in clutch housing 13 to two sides synchronous slide.
Left clutch slider 7 and right clutch slider 10 are arranged on main behaviour's connecting flange 2 respectively within the scope of effective travel
Cyclic annular card slot, the cyclic annular card slot on the first emergency operating bar 1 and the cyclic annular pocket matches fitting on the second emergency operating bar 6,
The switching action for realizing clutch, there is very high reliability.
Hydraulic device further includes plug stifled 11, for reliably limiting in effective travel to hydraulic cylinder 8 and piston rod 9.
Hydraulic device further includes locking nut 12, for hydraulic cylinder 8 respectively with left clutch slider 7 and right clutch slider 10 it
Between be locked, while being also used for being locked between left clutch slider 7 and right clutch slider 10 respectively of piston rod 9；
On the other hand the absolute sliding stroke that hydraulic cylinder 8 and piston rod 9 can be set, ensure that hydraulic cylinder 8 and piston rod 9 in opposite fortune
It cannot come off in dynamic.
Effective clutch stroke of hydraulic cylinder 8 and piston rod 9 ensure that by filling in stifled 11 and the cooperation adjusting of locking nut 12
The left clutch slider 7 of clutch and right clutch slider 10 respectively with the annular slot of main behaviour's connecting flange 2 and the first emergency operating bar
1, the reliable contacts of the annular slot of the second emergency operating bar 2, reliability are very high.
As shown in Figure 1, being based on above-mentioned novel clutch, the invention also provides a kind of parallel redundancy electromechanical actuator, packets
Include clutch 20, main behaviour's electromechanical actuator 21, first emergency actuator 22 and the second emergency actuator 23；Main behaviour's electromechanical actuator
When 21 failure, load and the main disengagement rapidly of behaviour's electromechanical actuator 21 will be run by clutch 20, are switched to the first emergency
Actuator 22 and the second emergency actuator 23 drive external loading movement.
Working principle: each function of novel clutch is highly integrated together, and the parallel connection for realizing translation output high thrust is superfluous
The coplanar equidistant placement and quick switchable function of remaining electromechanical actuator 3EMA.The hydraulic cylinder 8 and piston rod 9 of clutch are inserted
Enter inside clutch housing 13, between hydraulic cylinder 8 and shell 13, piston rod 9 and shell 13 and hydraulic cylinder 8 and piston rod 9
Form dischargeable capacity.Two hydraulic cylinders 8 and piston rod 9 are upper and lower in shell 13, are symmetrically arranged, and can drive left clutch slider
7 and right clutch slider 10 Fast synchronization sliding.To 4 punching press of oil inlet, hydraulic cylinder 8 and piston rod 9 drive left clutch sliding respectively
The synchronous smooth movement in shell 13 with right clutch slider 10 of block 7 is fitted closely with the annular groove of main behaviour's connecting flange 2；It will
Pressure interface is reversed, and to 5 punching press of oil outlet, hydraulic cylinder 8 and piston rod 9 drive left clutch slider 7 and right clutch slider 10 respectively
Reverse sync smoothly moves in shell 13, and main behaviour's connecting flange 2 disengages, respectively in the first emergency operating bar 1 and the second emergency
The annular groove of operating bar 6 fits closely.After clutch switching, main behaviour EMA and load are disengaged, and the auxiliary behaviour EMA in two sides passes through clutch
20 connect with load, drive load movement.
Embodiment
The control surface interface of clutch and the material selection precipitation-hardening stainless steel (480 ° of solid solution agings) of shell, tension
Intensity reaches 1310MPa, and the reliability of invention clutch is very high.
It is realized based on clutch, being translatable using the parallel redundancy electromechanical actuator of motor driven driving form, it is big to export
Thrust: 30 tons of nominal load, 60 tons of impact load.3 electromechanical actuator parallel redundancies substantially increase use reliability.
The clutch time of clutch is tested: being done experiment to clutch, the switching time of clutch slider is recorded, to from
Clutch pressurization starts, and clutch slider respectively records 3 times, and numerical value is as follows:
1 clutch slider of table extends and retracts time record
| Serial number | Stretch out the time | Retract the time |
| 1 | 1.2s | 1s |
| 2 | 1.7s | 1.8s |
| 3 | 1.5s | 1.5s |
| It is average | 1.5s | About 1.5s |
The results show that the novel clutch clutch action time is much smaller than the requirement of totality 5s, switching time is short.
The content that description in the present invention is not described in detail belongs to techniques known.
Claims (10)
1. a kind of clutch, characterized by comprising: the first emergency operating bar (1), main behaviour's connecting flange (2), control surface interface
(3), the second emergency operating bar (6), hydraulic device and shell (13)；
The centre side of shell (13) is provided with main behaviour's connecting flange (2), and the other side is provided with control surface interface (3), main
Cyclic annular card slot is provided on behaviour connecting flange (2), and the ring-type card slot is extend into shell (13), the first emergency operating bar (1)
With second emergency operating bar (6) be mounted on shell (13), position about main behaviour connecting flange (2) symmetrically, first meet an urgent need actuation
The part being located in shell (13) on bar (1) and the second emergency operating bar (6) is provided with cyclic annular card slot；Hydraulic device setting exists
Shell (13) is internal, with cyclic annular card slot, the first cyclic annular card slot met an urgent need on operating bar (1) being arranged on main behaviour connecting flange (2)
And second emergency operating bar (6) on cyclic annular card slot cooperation realize clutch action.
2. a kind of clutch according to claim 1, it is characterised in that: control surface interface (3) and main behaviour's connecting flange (2)
Coaxially, control surface interface (3) is hollow cylindrical structure, screw thread is inside set, for connecting external loading.
3. a kind of clutch according to claim 1, it is characterised in that: be additionally provided on shell (13) oil inlet (4) and
Oil outlet (5), for hydraulic device pressurising and pressure release.
4. a kind of clutch according to claim 1, it is characterised in that: the axis of the first emergency operating bar (1), second answer
The axis of anxious operating bar (6) is parallel with main behaviour's axis of connecting flange (2).
5. a kind of clutch according to claim 1, it is characterised in that: the hydraulic device include left clutch slider (7),
Hydraulic cylinder (8), piston rod (9) and right clutch slider (10)；
Between hydraulic cylinder (8) and shell (13), between hydraulic cylinder (8) and piston rod (9), between piston rod (9) and shell (13)
Equal dischargeable capacity, two hydraulic cylinders (8) arrangement symmetrical above and below in clutch housing (13), hydraulic cylinder (8) and piston rod (9)
With work, drive left clutch slider (7) and right clutch slider (10) in clutch housing (13) interior synchronous slide.
6. a kind of clutch according to claim 5, it is characterised in that: left clutch slider (7) and right clutch slider (10)
Within the scope of effective travel, meet an urgent need on operating bar (1) with the cyclic annular card slot being arranged on main behaviour connecting flange (2), first respectively
Cyclic annular pocket matches fitting on cyclic annular card slot and the second emergency operating bar (6).
7. a kind of clutch according to claim 5 or 6, it is characterised in that: the hydraulic device further includes filling in stifled (11),
For being limited in effective travel to hydraulic cylinder (8) and piston rod (9).
8. a kind of clutch according to claim 7, it is characterised in that: the hydraulic device further includes locking nut
(12), it is used for hydraulic cylinder (8) being locked between left clutch slider (7) and right clutch slider (10) respectively, while also being used
In piston rod (9) being locked between left clutch slider (7) and right clutch slider (10) respectively.
9. a kind of clutch according to claim 8, it is characterised in that: effective row of hydraulic cylinder (8) and piston rod (9)
Journey is adjusted by filling in stifled (11) and locking nut (12) cooperation.
10. it is a kind of based on clutch described in claim 1 realize parallel redundancy electromechanical actuator, it is characterised in that: including from
Clutch (20), main behaviour's electromechanical actuator (21), the first emergency actuator (22) and the second emergency actuator (23)；Main behaviour is electromechanical to be made
When dynamic device (21) break down, by clutch (20) will operation load and the disengagement of main behaviour electromechanical actuator (21), be switched to the
One emergency actuator (22) and the second emergency actuator (23).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710827939.9A CN107738739B (en) | 2017-09-14 | 2017-09-14 | A kind of clutch and the parallel redundancy electromechanical actuator based on clutch realization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710827939.9A CN107738739B (en) | 2017-09-14 | 2017-09-14 | A kind of clutch and the parallel redundancy electromechanical actuator based on clutch realization |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107738739A CN107738739A (en) | 2018-02-27 |
| CN107738739B true CN107738739B (en) | 2019-04-09 |
Family
ID=61235863
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710827939.9A Active CN107738739B (en) | 2017-09-14 | 2017-09-14 | A kind of clutch and the parallel redundancy electromechanical actuator based on clutch realization |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107738739B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109470384B (en) * | 2018-11-08 | 2020-09-18 | 北京精密机电控制设备研究所 | Output force measuring and calibrating device of double-path brake actuator |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203464898U (en) * | 2013-08-16 | 2014-03-05 | 北京精密机电控制设备研究所 | Parallel-connection dual redundancy LVDT type displacement sensor |
| CN104579027A (en) * | 2013-10-29 | 2015-04-29 | 北京精密机电控制设备研究所 | High-redundancy integrated tri-redundancy electromechanical servo mechanism |
| CN204533416U (en) * | 2015-02-27 | 2015-08-05 | 北京精密机电控制设备研究所 | Electromechanical actuator |
| CN106224402A (en) * | 2016-09-08 | 2016-12-14 | 北京精密机电控制设备研究所 | A kind of integration bayonet clutch |
| CN106628075A (en) * | 2015-10-30 | 2017-05-10 | 北京精密机电控制设备研究所 | Heterogeneous parallel redundant steering mechanism |
| CN106787412A (en) * | 2016-11-15 | 2017-05-31 | 北京精密机电控制设备研究所 | A kind of highly integrated formula electromechanical actuator of integrated design |
| CN107153351A (en) * | 2016-03-02 | 2017-09-12 | 西门子公司 | The redundancy control system of actuator and the method for its Redundant Control |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030221730A1 (en) * | 2002-01-17 | 2003-12-04 | Porter Don B. | Multi-stage multi-piston valve |
-
2017
- 2017-09-14 CN CN201710827939.9A patent/CN107738739B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203464898U (en) * | 2013-08-16 | 2014-03-05 | 北京精密机电控制设备研究所 | Parallel-connection dual redundancy LVDT type displacement sensor |
| CN104579027A (en) * | 2013-10-29 | 2015-04-29 | 北京精密机电控制设备研究所 | High-redundancy integrated tri-redundancy electromechanical servo mechanism |
| CN204533416U (en) * | 2015-02-27 | 2015-08-05 | 北京精密机电控制设备研究所 | Electromechanical actuator |
| CN106628075A (en) * | 2015-10-30 | 2017-05-10 | 北京精密机电控制设备研究所 | Heterogeneous parallel redundant steering mechanism |
| CN107153351A (en) * | 2016-03-02 | 2017-09-12 | 西门子公司 | The redundancy control system of actuator and the method for its Redundant Control |
| CN106224402A (en) * | 2016-09-08 | 2016-12-14 | 北京精密机电控制设备研究所 | A kind of integration bayonet clutch |
| CN106787412A (en) * | 2016-11-15 | 2017-05-31 | 北京精密机电控制设备研究所 | A kind of highly integrated formula electromechanical actuator of integrated design |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107738739A (en) | 2018-02-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107738739B (en) | A kind of clutch and the parallel redundancy electromechanical actuator based on clutch realization | |
| CN105270607A (en) | Helm system locking device | |
| CN103382969B (en) | The pneumatic gyropilot of vehicular clutch | |
| CN208281487U (en) | The speed change operating valve of the built-in neutral signal device of loading machine | |
| CN103629194B (en) | The integrated electric hydraulic actuator of mechanical type snap-action | |
| CN102003919B (en) | Novel gas-liquid mixed power ejection device | |
| CN110081164A (en) | Loading machine gearbox shifting amortization multi-function variable-speed manipulates valve and its control method | |
| CN106838047B (en) | Double-oil-cylinder clutch structure | |
| CN104196820B (en) | Energy-saving cylinder | |
| CN104319120B (en) | Time-delay mechanism and use hydraulic actuating mechanism and the chopper of this time-delay mechanism | |
| CN105667751A (en) | Double-speed twin-engine incoporation marine gearbox with reverse | |
| CN205708783U (en) | A kind of stopper | |
| CN108006107A (en) | A kind of soft clutch and the oil return line system of soft braking | |
| CN203809429U (en) | Mechanical quick-break integrated electro-hydraulic actuator | |
| CN202597541U (en) | New-energy dual-mode special clutch mechanism | |
| CN2517920Y (en) | Remote control valve | |
| CN203374689U (en) | Pneumatic automatic operating device for vehicle clutch | |
| CN203308543U (en) | Camshaft pressure-relief device | |
| CN105649784B (en) | Engine exhaust throttling set and method for heavy motor truck auxiliary braking | |
| CN107984788A (en) | A kind of quick pressure setting of high speed stamping hydraulic press | |
| CN202349016U (en) | Pneumatic clutch | |
| CN205615695U (en) | Duplex and car marine gearbox backed a car in double speed area | |
| CN104976013A (en) | Diesel engine starting system | |
| CN203009135U (en) | Pneumatic starting system of explosion-proof diesel engine | |
| CN203962542U (en) | The high speed compound oil cylinder that a kind of servovalve drives |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |