CN204828360U - Power take -off - Google Patents

Power take -off Download PDF

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Publication number
CN204828360U
CN204828360U CN201520494457.2U CN201520494457U CN204828360U CN 204828360 U CN204828360 U CN 204828360U CN 201520494457 U CN201520494457 U CN 201520494457U CN 204828360 U CN204828360 U CN 204828360U
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China
Prior art keywords
input shaft
housing
clutch
output shaft
oil
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Active
Application number
CN201520494457.2U
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Chinese (zh)
Inventor
王军
王亚锋
赵会强
马万灵
毕乾坤
李军
高佩
王乐
顾俊宏
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Xian FC Intelligence Transmission Co Ltd
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Xian FC Intelligence Transmission Co Ltd
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Priority to CN201520494457.2U priority Critical patent/CN204828360U/en
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Abstract

The utility model provides a power take -off, including the casing, vacuole formation in the casing internal surface, the coaxial setting of input shaft and output shaft is in the casing cavity, and the input shaft stretches out the casing part to be connected with the power supply, and the output shaft stretches out the casing part and exports auxiliary equipment to be connected, combination through the clutch and separate the joint and the separation of realization input shaft and output shaft, solenoid valve powered on, pressure oil promotes the piston and compresses tightly clutch, clutch engaging, solenoid valve powered off, the pressure oil head disappears, under the spring action, clutch release, during clutch engaging, the moment of torsion and the power that come from the power supply pass through input shaft, clutch, arrive the output shaft to drive the auxiliary equipment that links to each other, realize power take -off's basic function, the joint can not need to realize under the input shaft or the output device stall circumstances that simultaneously, the hydraulic pressure oil sources that automatic gearbox took that can facilitate the use is controlled, is lubricated and the cooling with the separation between input shaft and the output shaft.

Description

A kind of power takeoff
[technical field]
The utility model relates to a kind of drive aid, is specifically related to a kind of power takeoff.
[background technique]
Power takeoff uses, usually for providing driving power to auxiliary device together with power source such as motor car engine, motor or speed changer.Such as, road vehicle and off highway vehicle use power takeoff to supply power to auxiliary device, such as oil pump, water pump, motor, compressor, hinged disk, fan etc.Industry equipment supplies power to oil pump and various fixture.Agri-vehicle supplies power to mowing machine and winch etc.Means of transportation supplies power to oil pump, advancing means etc. at sea.
Typical power takeoff is made up of housing, the input gear reaching outside, the output shaft that reaches outside.When power takeoff is installed on a power source rotated, rotate together with its input gear and the actuation gear by power source engage also.Input gear links together with output shaft directly or indirectly, and power and power are passed to output shaft from input gear.Auxiliary device is oil pump, water pump such as, is directly or indirectly connected on output shaft, rotates together with power source, and utilizes the power and power that pass over.
Can be engaged by sliding sleeve, shifting slide gear or clutch and be separated between input gear and output shaft.Current power takeoff mostly is pneumatic power takeoff, air valve switching gas circuit mode is used in conjunction with being separated, gas circuit leads to the control cylinder of power takeoff, and control cylinder drives shift fork to stir sliding sleeve or shifting slide gear, thus combination between control inputs gear and output shaft be separated.But pneumatic power takeoff is used for the power source being with manual transmission.Because Pneumatic power takeoff device generally is sliding gear collar or shifting slide gear gearshift, need to cut off power during gearshift and realize gearshift, and hydraulic automatic speed variator cannot realizes power interruption.For the power source using automatic transaxle more and more widely at present, there is no the power takeoff matched at present.Thus, invent and aly the power takeoff of matching strip automatic transmission power source can seem very necessary.
[model utility content]
The purpose of this utility model is to provide a kind of compact structure, gearless driving, efficient coaxial line through-put power, particularly can the power takeoff of matching strip power transmission system of automatic gearbox.
For achieving the above object, the utility model adopts following technological scheme:
A kind of power takeoff, comprise housing, form cavity in shell inner surface, input shaft and output shaft are coaxially arranged in housing hollow, and input tail shaft is connected with power source, export tail shaft and are connected with output fixture; Be provided with clutch between input shaft and output shaft, clutch side is provided with and promotes it and combine and the piston be separated and Returnning spring, by the combination of clutch be separated the joint that realizes input shaft and output shaft and be separated;
Two-bit triplet solenoid valve is installed in described housing, solenoid valve import and outside oil sources fittings, joint is communicated with oil pump by oil pipe, high-pressure oil duct is provided with in housing, high-pressure oil duct one end is communicated with housing hollow with solenoid valve one outlet, the other end, when solenoid valves, hydraulic oil is mineralization pressure chamber between shell inner surface and piston by solenoid valve and high-pressure oil duct, and promotion piston moves and clutch is combined; Oil return oil duct is also provided with in housing, oil return oil duct one end is communicated with housing hollow with another outlet of solenoid valve, the other end, when solenoid valve power-off, Returnning spring promotes clutch separation, and hydraulic oil enters the rotary component in cavity lubrication, cooling cavity by high-pressure oil duct, solenoid valve and oil return oil duct.
Further, described clutch is made up of multi-sheet wet-type friction plate and antithesis sheet, input shaft is fixed with input tooth hub, friction plate is arranged on input tooth hub by spline, output shaft is fixed with output gear hub, cylindric output gear hub is arranged around input tooth hub, and antithesis sheet is installed on output gear hub internal surface by spline; High pressure liquid force feed promotes piston pressing friction sheet and antithesis sheet and realizes clutch and combine, and when hydraulic fluid pressure disappears, under action of reset spring, friction plate and antithesis sheet are mutually thrown off and realized clutch separation.
Further, be provided with pressure lubrication oil duct in described housing, oil leab one end is communicated with housing hollow with oil sources fittings, the other end, carries out pressure lubrication to work rotary component.
Further, be provided with piston seat in described housing hollow, described piston is promoted by piston seat and the first cone bearing be embedded in piston seat, is gap, is sealed by O type circle between the anchor ring that piston seat outer shroud and shell inner surface are formed.
Further, described input shaft one end is supported in the first opening of housing side by the second cone bearing, and the other end is supported in piston seat by the first cone bearing, realizes the swing of single-point support.
Further, act on both sides respectively between the input tooth hub on described input shaft and piston by the pretightening force of Returnning spring, input shaft two ends are respectively provided with Circlip apparatus and carry out spacing.
Further, described shell one end arranges the bearing cap connecting and support output shaft, and described output shaft one end spindle nose inserts in the needle bearing in the endoporus of input shaft end, and the output shaft the other end is supported on bearing cap by ball bearing.
Further, described solenoid valve is electromagnetic proportional valve or electromagnetic switch valve.
Power takeoff of the present utility model changes transmitted power between input gear and output shaft between input shaft and output shaft 1:1 transmitted power; By the joint between input gear and output shaft be separated by traditional use source of the gas, by cylinder, shift fork, sliding sleeve realize change between input shaft and output shaft engage and is separated use hydraulic oil source, by solenoid valve, clutch realization.Engage between input shaft and output shaft and can realize not needing input shaft or output unit to stop operating in situation with being separated, and the combination between traditional, pneumatic power takeoff input gear and output shaft must realize when input gear or output unit stop operating with being separated.Meanwhile, can automatic transmission easy to use with hydraulic oil source, carry out controlling, lubrication and cooling.
The existing kind of drive certainly will cause the generation of disalignment deployment scenarios due to the mode of two gears meshing, and can increase the size of actuating unit, two gears meshing forms also can increase cost and weight; A pair gears meshing can cause cantilever beam structure supporting form, needs bearing to support accordingly, and mesh gear manner also needs rational lubrication, and can produce power loss; Input shaft and output shaft are coaxially arranged in housing hollow by the utility model, and by coaxial transmission, compact structure, transmission device size is little, and realize efficient coaxial line gearless driving, through-put power is higher, and supporting structure is simpler.
Further, piston is promoted by piston seat and the first cone bearing be embedded in piston seat, and piston seat can have suitable deflection in moving process; Be embedded between the inner ring of the first cone bearing in piston seat and input shaft is gap, there is the effect of guiding and support input shaft assembly, cone bearing can be made only to transmit the impacting force of axial direction and eliminate the moment of torsion of sense of rotation by the rotary action of the first cone bearing, the relative rotation speed can eliminated and reduce between piston and the friction plate/antithesis sheet be in contact with it is poor; Also by the deflection that effect reduction piston and the piston seat of cone bearing cause due to movement, realize the adaptivity matched, prevent the clamping stagnation in moving process, reduce machining accuracy.
Further, input shaft is supported on power takeoff housing first opening by the second cone bearing, and the other end is supported in piston seat by the first cone bearing, can realize the swing of single-point support.Both sides are acted on respectively by the pretightening force of Returnning spring between input tooth hub on input shaft and piston, it is spacing that input shaft two ends respectively have Circlip apparatus to carry out, like this under the pressure effect of Returnning spring for two cone bearings provide suitable bearing pre-fastening, input shaft can locate voluntarily and ensure to supplement in good time due to piston and other move the gap caused, prevent from vibrating and impacting the damage of components caused.
Further, output shaft spindle nose inserts in the needle bearing in the endoporus of input shaft end, realize diaxon to contact with articulated form, diaxon all swings by its support end, the coaxality requirement of housing member can be reduced, and the swing that vibration during the transmission shaft that can reduce because power takeoff connects and power taking and impact cause.
Further, solenoid valve is electromagnetic proportional valve or the electromagnetic switch valve that can export different pilot pressure with controlling curent change, in good time control can be filled with the oil pressure in piston seat oil pressure chamber, the control to different output torque can be realized, also the different control logics that power takeoff engages can be realized, the cunning that can realize between friction plate and antithesis sheet is rubbed and is controlled, and can reduce the positive engagement of clutch, reduces the wearing and tearing of clutch.Solenoid electric valve can realize corresponding control logic at any time, can meet in good time power taking demand, do not need force taking of parking after being installed in vehicle, also because the controllable pressure of solenoid valve realizes different gear, different rotating speeds, and the power taking demand of different moment of torsion.
[accompanying drawing explanation]
Fig. 1 is the sectional view of the utility model power takeoff;
Fig. 2 is the axonometric drawing of the utility model power takeoff;
In figure: housing 11; Input shaft 12; Output shaft 13; Clutch 14; Solenoid valve 15; Wet-type friction slice 16; Antithesis sheet 17; Piston 18; Piston seat 19; Returnning spring 20; Needle bearing 21; Cavity 22; First opening 23; Second opening 24; High-pressure oil duct 25; Oil return oil duct 26; Input tooth hub 27; Output gear hub 28; First cone bearing 29; Bearing cap 30; Oil leab 31; Second cone bearing 32; Ball bearing 33; Oil sealing 34; 3rd opening 35; Bolt hole 36; Oil pump 37; Oil pipe 38; Joint 39.
[embodiment]
Below in conjunction with accompanying drawing, the utility model is described in detail:
As illustrated in fig. 1 and 2, the utility model discloses a kind of power takeoff, comprise housing 11, input shaft 12, output shaft 13, clutch 14, solenoid valve 15 and bearing cap 30.Oil pump 37 provides hydraulic oil source, and the high pressure oil produced provides pilot pressure for power takeoff combines with being separated, simultaneously for power takeoff is provided for the fluid of lubrication and cooling.Oil pump 37 is generally arranged on speed changer, is driven by power sources such as motors.
Described housing has internal surface and outer surface, internal surface forms cavity 22, the first opening 23 and the 3rd opening 35 is formed between inner and outer surface, first opening 23 and cavity 22 provide places part in housing, 3rd opening 35 is for placing solenoid valve, housing 11 one end arranges the bearing cap 30 connecting and support output shaft, also comprise high-pressure oil duct 25 and oil return oil duct 26 and oil leab 31, if certain road vehicle will use power takeoff, be connected with bolt with the bolt hole 36 on input end flange connection surface by input shaft, power takeoff is installed on the speed changer on road vehicle.
Input shaft 12 and output shaft 13 are coaxially arranged in housing hollow 22, and input shaft 12 stretches out housing parts and is connected with power source, and output shaft 13 stretches out housing parts and is connected with output fixture; Be provided with clutch 14 between input shaft 12 and output shaft 13, clutch 14 side is provided with and promotes it and combine and the piston 18 be separated and Returnning spring 20, by the combination of clutch 14 be separated the joint that realizes input shaft 12 and output shaft 13 and be separated;
Be provided with two-bit triplet solenoid valve 15 in housing 11, the high-pressure oil duct 25 on housing 11 is oil ducts of solenoid valve high pressure oil process, and high-pressure oil duct 25 one end is communicated with the 3rd opening 35, and the other end is communicated with cavity 22 by internal oil passages.When solenoid valves, hydraulic oil through high-pressure oil duct 25 mineralization pressure chamber between shell inner surface and piston seat outer surface by solenoid valve, is promoted piston and moves right, clutch is combined.
Oil return oil duct 26 is oil return oil ducts of solenoid valve 15, simultaneously lubrication power takeoff; Housing provides pressure lubrication oil duct 31 in addition, is connected by outer surface and oil sources joint, connected by internal surface and cavity, when solenoid valve power-off, lubricant oil enters cavity 22 by oil sources joint through oil leab 31, the rotary component in lubrication, cooling cavity.When solenoid valves, provide pressure lubrication to the rotary component of work.Hydraulic oil power source also can be the power source in other power transmission system except road vehicle.
Input shaft is installed in housing by the first opening 23, and wherein a part is in housing hollow, and another part stretches out housing outer surface.All there is spline at input shaft two ends, respectively with power source with input tooth hub 27 and be connected.Input shaft 12 stretches out the splined section of housing 11 outside, with the live axle spline fitted in speed changer on road vehicle, moment of torsion and the power of such truck engine are delivered to power takeoff by speed changer, then fixture is driven, and the rotating speed passed over and rotation direction can change, and can not be consistent with motor.Above-mentioned spline joint mode also can be other conventional mechanical connection manner.
Output shaft 13 passes on left needle bearing 21 and supports on input shaft 12, is connected with output gear hub 28 by welding manner.Right side is installed in the bearing hole of bearing cap 30 by ball bearing 33.Output shaft 13 right-hand member directly or indirectly connects above-mentioned auxiliary device, such as oil pump, oil hydraulic motor etc.Effectively can cushion the swing that power takeoff causes.
Bearing cap 30 is connected with junction plane on the right side of housing 11 by bolt, comprises ball bearing 33 and oil sealing 34.Output shaft 13 is installed in the second opening 24 of bearing cap 30 completely.
Solenoid valve 15 is assemblied on housing by the 3rd opening 35 on housing.Solenoid valve controls its switch by presetting electrical signal, thus controls high pressure oil from oil pipe 38 to the break-make of high-pressure oil duct 25.
The joint of clutch is realized by pressure oil pressing friction sheet and antithesis sheet, and clutch is made up of one group of Wet-type friction slice, 16, one group of antithesis sheet 17.Place a slice antithesis sheet 17 every a slice friction plate 16 during assembling, friction plate 16 is arranged on input tooth hub 27 by spline, and antithesis sheet 17 is installed to output gear hub 28 internal surface by spline.Input tooth hub 27 is fixed on input shaft 12, and piston seat 19 is installed in the cavity of housing 11 by coordinating.When clutch 14 is separated, friction plate 16 and antithesis sheet 17 freely rotate each other, now allow to relatively rotate between input shaft 12 and output shaft 13.When clutch 14 in conjunction with time, friction plate 16 and antithesis sheet 17 compress each other, now between input shaft 12 and output shaft 13, nothing relatively rotates, moment of torsion and the power of power takeoff can be entered, be delivered on output shaft 13 by input shaft 12 and clutch 14, and drive the above-mentioned fixture be attached thereto to rotate.
The combination of clutch 14 is controlled by the pressure oil by the high-pressure oil duct 25 on housing 11.High-pressure oil duct 25 communicates with the cavity between housing 11 and piston seat 19.The pressure oil produced when oil pump 37 delivers to the cavity between housing 11 and piston seat 19 by oil pipe 38, joint 39, solenoid valve 15, high-pressure oil duct 25, will promote piston 18 and move right, compression reseting spring 20, thus clutch 14 is combined completely.When not having pressure oil or pressure oil lower than certain numerical value in high-pressure oil duct 25, clutch 14 will be separated under the spring-force driven dual of Returnning spring 20.
Described solenoid valve is used for the break-make of the pressure oil controlling to enter power takeoff and pressure value.When solenoid valves, from the pressure oil of oil pump by oil pipe, joint, solenoid valve, housing pressure oil duct, cavity between shell inner surface and piston seat, promotion piston moves right, pressing friction sheet and antithesis sheet, clutch engages, and power takeoff is started working, from the moment of torsion of power source and power by input shaft, clutch, pass to output shaft, drive the fixture be connected with output shaft to rotate, at this moment pressure lubrication oil duct provides pressure lubrication to rotary component.When solenoid valve power-off, pressure oil from oil pump directly enters oil leab and provides lubrication, the cavity between housing and piston seat can not be entered into, the distress resolves of pressing friction sheet and antithesis sheet, piston is moved to the left under action of reset spring, clutch separation, power takeoff quits work, and does not have moment of torsion and power transimission to fixture
Power takeoff is applied on the equipment that driven by power source, such as: can be used as a dismountable fixture and use, be installed to by bolt on the speed changer be connected with motor, the oil pump of drive installation on truck, makes lift device work.Highway truck wherein, motor, speed changer, oil pump have further amplification follow-up, but there will not be in the accompanying drawings.Power takeoff is equally applicable to be installed in motor, motor, truck transmission, tractor, engineering vehicle, sea transport or other rotating power transmission system.
Further, being promoted by piston seat 19 and the first cone bearing 29 be embedded in piston seat, is gap between the anchor ring that piston seat 19 outer shroud and power takeoff housing 11 internal surface are formed, and sealed by O type circle, piston seat 19 can have suitable deflection in moving process; Being embedded between the inner ring of the first cone bearing 29 in piston seat 19 and input shaft is gap, has the effect of guiding and support input shaft assembly.
Input shaft 12 is supported on power takeoff housing first opening 23 by left end second cone bearing 32, and the other end is supported in piston seat by the first cone bearing 29, can realize the swing of single-point support.Both sides are acted on respectively by the pretightening force of Returnning spring 20 between input tooth hub 27 on input shaft and piston, it is spacing that input shaft two ends respectively have Circlip apparatus to carry out, like this under the pressure effect of Returnning spring for two cone bearings provide suitable bearing pre-fastening, input shaft can locate voluntarily and ensure to supplement in good time due to piston and other move the gap caused, prevent from vibrating and impacting the damage of components caused.
Output shaft 13 left end spindle nose inserts in the needle bearing 21 in input shaft right-hand member endoporus, output shaft is supported on bearing cap 30 by a ball bearing 33, input shaft and output shaft are all swingable axles of single-ended support, middle connected by needle bearing 21, realize diaxon to contact with articulated form, diaxon all swings by its support end, can reduce the coaxality requirement of housing member, and the swing that vibration during the transmission shaft that can reduce because power takeoff connects and power taking and impact cause.
Solenoid valve 15, for can export the electromagnetic proportional valve of different pilot pressure with controlling curent change, in good time control can be filled with the oil pressure that piston seat controls oil pressure chamber.

Claims (8)

1. a power takeoff, it is characterized in that: comprise housing (11), cavity (22) is formed in housing (11) internal surface, input shaft (12) and output shaft (13) are coaxially arranged in housing hollow (22), input shaft (12) stretches out housing parts and is connected with power source, and output shaft (13) stretches out housing parts and is connected with output fixture; Clutch (14) is installed between input shaft (12) and output shaft (13), clutch (14) side is provided with and promotes it and combine and the piston be separated (18) and Returnning spring (20), by the combination of clutch (14) be separated the joint that realizes input shaft (12) and output shaft (13) and be separated;
Two-bit triplet solenoid valve (15) is installed in described housing (11), solenoid valve (15) import is communicated with outside oil sources joint (39), joint (39) is communicated with oil pump (37) by oil pipe (38), high-pressure oil duct (25) is provided with in housing (11), high-pressure oil duct (25) one end and solenoid valve (15) outlet, the other end is communicated with housing hollow (22), when solenoid valves, hydraulic oil is by solenoid valve (15) and high-pressure oil duct (25) mineralization pressure chamber between shell inner surface and piston (18), promotion piston (18) is mobile makes clutch combine, oil return oil duct (26) is also provided with in housing (11), oil return oil duct (26) one end is communicated with housing hollow (22) with solenoid valve (15) another outlet, the other end, when solenoid valve (15) power-off, Returnning spring (20) promotes clutch (14) and is separated, and hydraulic oil enters the rotary component in cavity (22) lubrication, cooling cavity by high-pressure oil duct (25), solenoid valve (15) and oil return oil duct (26).
2. power takeoff according to claim 1, it is characterized in that: described clutch (14) is made up of multi-sheet wet-type friction plate (16) and antithesis sheet (17), input shaft (12) is fixed with input tooth hub (27), friction plate (16) is arranged in input tooth hub (27) by spline, output shaft (13) is fixed with output gear hub (28), cylindric output gear hub (28) is arranged around input tooth hub (27), and antithesis sheet (17) is installed on output gear hub (28) internal surface by spline; High pressure liquid force feed promotes piston (18) pressing friction sheet and antithesis sheet and realizes clutch and combine, and when hydraulic fluid pressure disappears, under action of reset spring, friction plate and antithesis sheet are mutually thrown off and realized clutch separation.
3. power takeoff according to claim 1, it is characterized in that: in described housing, be provided with pressure lubrication oil duct (31), oil leab (31) one end is communicated with oil sources joint (39), the other end is communicated with housing hollow (22), carries out pressure lubrication to work rotary component.
4. the power takeoff according to claim 1,2 or 3, it is characterized in that: piston seat (19) is installed in described housing hollow (22), described piston (18) is promoted by piston seat (19) and the first cone bearing (29) be embedded in piston seat, be gap between the anchor ring that piston seat (19) outer shroud and housing (11) internal surface are formed, sealed by O type circle.
5. power takeoff according to claim 4, it is characterized in that: described input shaft (12) one end is supported in first opening (23) of housing side by the second cone bearing (32), the other end is supported in piston seat (19) by the first cone bearing (29), realizes the swing of single-point support.
6. power takeoff according to claim 2, it is characterized in that: act on both sides respectively by the pretightening force of Returnning spring (20) between the input tooth hub (27) on described input shaft (12) and piston (18), input shaft (12) two ends are respectively provided with Circlip apparatus and carry out spacing.
7. power takeoff according to claim 4, it is characterized in that: described housing (11) one end arranges the bearing cap (30) connecting and support output shaft (13), described output shaft (13) one end spindle nose inserts in the needle bearing (21) in the endoporus of input shaft (12) end, and output shaft (13) the other end is supported on bearing cap (30) by ball bearing (33).
8. power takeoff according to claim 4, is characterized in that: described solenoid valve (15) is electromagnetic proportional valve or electromagnetic switch valve.
CN201520494457.2U 2015-07-09 2015-07-09 Power take -off Active CN204828360U (en)

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Application Number Priority Date Filing Date Title
CN201520494457.2U CN204828360U (en) 2015-07-09 2015-07-09 Power take -off

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Application Number Priority Date Filing Date Title
CN201520494457.2U CN204828360U (en) 2015-07-09 2015-07-09 Power take -off

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104989743A (en) * 2015-07-09 2015-10-21 西安双特智能传动有限公司 Torque extraction device
CN105757186A (en) * 2016-04-20 2016-07-13 福建奉田信新能源科技有限公司 Gearbox special for new energy automobile
CN106763283A (en) * 2016-12-22 2017-05-31 杭州前进齿轮箱集团股份有限公司 A kind of large-scale track maintenance vehicles transmit disengaging gear with gearbox dynamic
CN111692231A (en) * 2020-06-30 2020-09-22 中国重汽集团大同齿轮有限公司 Direct output type friction plate power takeoff
CN111801507A (en) * 2018-03-20 2020-10-20 舍弗勒技术股份两合公司 Slave cylinder with adapter locked with bayonet connection and method of installation

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104989743A (en) * 2015-07-09 2015-10-21 西安双特智能传动有限公司 Torque extraction device
CN105757186A (en) * 2016-04-20 2016-07-13 福建奉田信新能源科技有限公司 Gearbox special for new energy automobile
CN106763283A (en) * 2016-12-22 2017-05-31 杭州前进齿轮箱集团股份有限公司 A kind of large-scale track maintenance vehicles transmit disengaging gear with gearbox dynamic
CN111801507A (en) * 2018-03-20 2020-10-20 舍弗勒技术股份两合公司 Slave cylinder with adapter locked with bayonet connection and method of installation
CN111692231A (en) * 2020-06-30 2020-09-22 中国重汽集团大同齿轮有限公司 Direct output type friction plate power takeoff

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