CN110454560B - Hydraulic mechanical stepless transmission device for loader - Google Patents
Hydraulic mechanical stepless transmission device for loader Download PDFInfo
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- CN110454560B CN110454560B CN201910762275.1A CN201910762275A CN110454560B CN 110454560 B CN110454560 B CN 110454560B CN 201910762275 A CN201910762275 A CN 201910762275A CN 110454560 B CN110454560 B CN 110454560B
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- transmission
- main body
- bottom shell
- shaft
- transmission main
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H47/00—Combinations of mechanical gearing with fluid clutches or fluid gearing
- F16H47/02—Combinations of mechanical gearing with fluid clutches or fluid gearing the fluid gearing being of the volumetric type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H57/023—Mounting or installation of gears or shafts in the gearboxes, e.g. methods or means for assembly
Abstract
The invention discloses a hydraulic mechanical stepless transmission device for a loader, which comprises a transmission main body bottom shell, wherein a left transmission box and a right transmission box are fixedly arranged on the left side wall and the right side wall of the transmission main body bottom shell; the vertical fixedly connected with type of falling L steelframe in transmission main part drain pan rear portion left side, be located type of falling L steelframe right side fixed mounting have the oil pump, the perpendicular welding of type of falling L steelframe top intermediate position has the screw lead screw, and transmission main part drain pan rear lid has closed the guard shield. According to the invention, the rear part of the bottom shell of the transmission main body is covered with the protective cover, the middle part of one side of the protective cover, which is far away from the bottom shell of the transmission main body, is vertically provided with the mounting hole, the mounting hole is movably penetrated through the threaded screw rod, the screw thread on the threaded screw rod is screwed with the nut, the protective cover is covered at the rear end part of the bottom shell of the transmission main body to protect the oil pump, and the problem that the service life is shortened because the oil pump is always exposed outside and collided.
Description
Technical Field
The invention relates to the technical field of loaders, in particular to a hydraulic mechanical stepless transmission device for a loader.
Background
At present, the hydrostatic transmission can conveniently realize stepless speed regulation, so that an engine of a loader normally works in an economic rotating speed range, and the energy utilization efficiency of the whole vehicle can be improved; however, the efficiency of a hydraulic pump motor closed speed regulation loop used for hydrostatic transmission is also low, so that the lifting potential of the hydrostatic transmission is limited compared with a power shift hydraulic mechanical gearbox. The hydraulic mechanical transmission can realize high-efficiency stepless transmission by compounding mechanical power and hydraulic power, so that an engine maintains stable load, the improvement of fuel economy is facilitated, the hydraulic mechanical transmission becomes one of the development directions of a loader transmission system, and engineering machinery manufacturers at home and abroad actively develop the research of the transmission technology.
The retrieved Chinese patent number CN201820924761.X discloses a vehicle hydraulic mechanical stepless transmission device, although the technical scheme is provided with a first cylinder, a first push rod, a second cylinder and a second push rod, when a user uses the device, the first cylinder and the second cylinder are connected with an air compressor, so that the service life of the transmission device is prolonged.
However, the above solution has two major drawbacks:
1. the oil pump mechanism which is crucial in the technical scheme has no protective measures and is easily irreparably damaged by external impact;
2. the driving wheel and the driven wheel of the transmission mechanism drive the output shafts of the spline shaft and the transmission case to be meshed and transmitted in the same rotating direction, and the mode avoids the problem that the traveling mechanism cannot travel and the fatal traveling mechanism of the loader cannot operate due to the fact that the rotating directions of the output shafts of the first fixing box and the second fixing box which are positioned at the left side and the right side of the main body are different.
Disclosure of Invention
The invention aims to provide a hydraulic mechanical stepless transmission device for a loader, which solves the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a hydraulic mechanical stepless transmission device for a loader comprises a transmission main body bottom shell, wherein a left transmission box and a right transmission box are fixedly arranged on the left side wall and the right side wall of the transmission main body bottom shell; the left side of the rear part of the bottom shell of the transmission main body is vertically and fixedly connected with an inverted L-shaped steel frame, an oil pump is fixedly arranged on the right side of the inverted L-shaped steel frame, an oil inlet of the oil pump is fixedly communicated with an oil inlet pipe, an oil outlet of the oil pump is fixedly communicated with the head end of an oil conveying pipe, a threaded lead screw is vertically welded in the middle of the top of the inverted L-shaped steel frame, a protective cover is covered on the rear part of the bottom shell of the transmission main body, a mounting hole is vertically formed in the middle of one side, away from the bottom shell of the transmission main;
a partition plate is transversely and vertically integrated in the middle of the inner cavity of the bottom shell of the transmission main body, two first bearings which are symmetrically distributed about a partition line in the middle of the partition plate are vertically embedded and fixed on the partition plate, and a counter shaft and a main shaft are vertically penetrated in a middle shaft of the two first bearings; the end parts of the main shaft and the auxiliary shaft are both transversely fixed with an active transmission spline shaft, a left follow-up gear and a right driving gear are respectively fixed on the main shaft and the auxiliary shaft which are positioned in front of the partition plate, and the opposite sides of the left follow-up gear and the right driving gear are mutually meshed;
and a second bearing is embedded and fixed on the side wall of the bottom shell of the transmission main body in the middle area of the left transmission box and the right transmission box, a transmission shaft rod horizontally penetrates through the middle shaft of the second bearing, a left spline shaft and a right spline shaft are respectively fixed at the opposite ends of the transmission shaft rods in the left transmission box and the right transmission box, and the left spline shaft and the right spline shaft are respectively meshed with the auxiliary shaft and the driving transmission spline shaft at the front end of the main shaft.
As a preferred embodiment of the invention, a tripod is welded on the middle of the left side and the right side of the bottom case of the transmission main body in a horizontally aligned manner, and a mounting hole is vertically formed at one end of the tripod, which is far away from the bottom case of the transmission main body.
As a preferred embodiment of the invention, an inverted U-shaped notch is vertically formed in the lower position of the middle part of the right side of the shield, the inverted U-shaped notch is movably sleeved with the oil inlet pipe, and the shield is formed by compression molding of manganese steel.
In a preferred embodiment of the present invention, the upper portions of the front and rear side walls of the shield are horizontally provided with grooves.
As a preferred embodiment of the invention, the rear end part of the main shaft is in transmission connection with a hydraulic cylinder, and the hydraulic cylinder is fixedly communicated with the tail end of an oil pipeline.
In a preferred embodiment of the present invention, the top end surface of the partition plate is flush with the top surface of the transmission main body bottom case.
As a preferred embodiment of the present invention, a top cover covers the top of the bottom casing of the transmission main body, and four corners of the top cover are fixedly connected to the bottom casing of the transmission main body through fixing bolts.
In a preferred embodiment of the present invention, four corners of the top of the bottom casing of the transmission main body are respectively provided with bolt holes adapted to the fixing bolts.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the rear part of the bottom shell of the transmission main body is covered with the protective cover, the middle part of one side of the protective cover, which is far away from the bottom shell of the transmission main body, is vertically provided with the mounting hole, the mounting hole is movably penetrated through the threaded screw rod, the screw thread on the threaded screw rod is screwed with the nut, the protective cover is covered at the rear end part of the bottom shell of the transmission main body to protect the oil pump, and the problem that the service life is shortened because the oil pump is always exposed outside and collided.
2. According to the invention, the left follow-up gear and the right driving gear are respectively fixed on the main shaft and the auxiliary shaft which are positioned in front of the partition plate, and opposite sides of the left follow-up gear and the right driving gear are mutually meshed, so that the auxiliary shaft and the main shaft which are fixed with the left follow-up gear and the right driving gear can rotate oppositely or oppositely through the meshing transmission of the left follow-up gear and the right driving gear, the problem of great mechanical power loss caused by the belt or chain transmission mode in the prior art is solved, the transmission efficiency is obviously improved, and the problems that the auxiliary shaft and the main shaft rotate simultaneously due to the belt or chain transmission mode in the prior art, the output shaft which is meshed with the auxiliary shaft rotates at different hands, and the mechanical walking cannot be caused are solved.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic view of the overall structure of a hydraulic mechanical stepless transmission device for a loader according to the present invention;
FIG. 2 is a schematic structural view of an inner cavity of a bottom shell of a transmission main body of the hydraulic mechanical stepless transmission device for the loader;
FIG. 3 is a schematic view of the structure of the hydraulic mechanical stepless transmission device for the loader of the present invention;
fig. 4 is an enlarged schematic structural diagram of a part a of the hydraulic mechanical stepless transmission device for the loader.
In the figure: the transmission main body comprises a bottom shell 1, a mounting hole 2, a machine foot frame 3, a right transmission box 4, a top cover 5, a fixing bolt 6, a left transmission box 7, an oil conveying pipe 8, an oil pump 9, an inverted L-shaped steel frame 10, a shield 11, an oil inlet pipe 12, an inverted U-shaped notch 13, a mounting hole 14, a threaded screw rod 15, a nut 16, a groove 17, a first bearing 18, a left follow-up gear 19, a transmission shaft rod 20, a second bearing 21, a left spline shaft 22, a driving transmission spline shaft 23, a right spline shaft 24, a right driving gear 25, a partition plate 26, a main shaft 27, a bolt hole 28, a hydraulic cylinder 29 and an auxiliary shaft 30.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
Referring to fig. 1-4, the present invention provides a technical solution: a hydraulic mechanical stepless transmission device for a loader comprises a transmission main body bottom shell 1, wherein a left transmission box 7 and a right transmission box 4 are fixedly arranged on the left side wall and the right side wall of the transmission main body bottom shell 1 in a distributed manner; the left side of the rear part of a bottom shell 1 of a transmission main body is vertically and fixedly connected with an inverted L-shaped steel frame 10, an oil pump 9 is fixedly arranged on the right side of the inverted L-shaped steel frame 10, an oil inlet of the oil pump 9 is fixedly communicated with an oil inlet pipe 12, an oil outlet of the oil pump 9 is fixedly communicated with the head end of an oil conveying pipe 8, a threaded lead screw 15 is vertically welded in the middle of the top of the inverted L-shaped steel frame 10, a protective cover 11 covers the rear part of the bottom shell 1 of the transmission main body, a mounting hole 14 is vertically formed in the middle of one side, away from the bottom shell 1 of the transmission main body, of the protective cover 11, the mounting hole 14 is movably penetrated through the threaded lead screw 15, a nut 16 is screwed on the threaded lead screw 15 through threads, the protective cover 11 is adopted to;
a partition plate 26 is transversely and vertically integrally arranged in the middle of the inner cavity of the bottom shell 1 of the transmission main body, two first bearings 18 which are symmetrically distributed about a middle dividing line of the partition plate 26 are vertically embedded and fixed on the partition plate 26, and a counter shaft 30 and a main shaft 27 vertically penetrate through the middle shaft of the two first bearings 18; the end parts of the main shaft 27 and the auxiliary shaft 30 are both transversely fixed with a driving transmission spline shaft 23, the main shaft 27 and the auxiliary shaft 30 which are positioned in front of the partition plate 26 are respectively fixed with a left follow-up gear 19 and a right driving gear 25, opposite sides of the left follow-up gear 19 and the right driving gear 25 are mutually meshed, and the auxiliary shaft 30 and the main shaft 27 which are fixed with the left follow-up gear 19 and the right driving gear 25 are ensured to rotate oppositely or oppositely through the meshing transmission of the left follow-up gear 19 and the right driving gear 25, so that the problem of large mechanical power loss caused by a belt or chain transmission mode in the prior art is solved, and the transmission efficiency is obviously improved;
the side walls of the transmission main body bottom shell 1 in the middle areas of the left transmission box 7 and the right transmission box 4 are fixedly embedded with second bearings 21, transmission shaft rods 20 horizontally penetrate through the middle shafts of the second bearings 21, the opposite ends of the transmission shaft rods 20 in the left transmission box 7 and the right transmission box 4 are respectively and fixedly provided with a left spline shaft 22 and a right spline shaft 24, the left spline shaft 22 and the right spline shaft 24 are respectively meshed with the active transmission spline shafts 23 at the front ends of the auxiliary shaft 30 and the main shaft 27, the two active transmission spline shafts 23 rotate oppositely and then drive the left spline shaft 22 and the right spline shaft 24 to be meshed and transmitted, so that the transmission shaft rods 20 on the left spline shaft 22 and the right spline shaft 24 are driven to rotate in the same direction, and the best mechanical transmission effect is achieved.
In this embodiment, the side level aligns welding has a undercarriage 3 on the middle part of the left and right sides of transmission main part drain pan 1, and the one end that transmission main part drain pan 1 was kept away from to undercarriage 3 has vertically seted up mounting hole 2, and the 2 later stages of mounting hole are fixed through the cooperation of the gearbox roof beam structure of bolt and loader.
In this embodiment, the lower position of the middle part of the right side of the shield 11 is vertically provided with an inverted U-shaped notch 13, the inverted U-shaped notch 13 is movably sleeved with the oil inlet pipe 12, the shield 11 is molded by manganese steel, and when the shield 11 is installed, the untight condition of the cover of the shield 11 cannot be caused after the cooperation of the inverted U-shaped notch 13 and the oil inlet pipe 12.
In this embodiment, the upper portion of both sides wall is all seted up horizontally to guard shield 11 front and back and is seted up recess 17, and this recess 17 can make things convenient for later stage operating personnel to demolish guard shield 11 when, takes guard shield 11 with the hand through recess 17.
In this embodiment, the rear end of the main shaft 27 is in transmission connection with a hydraulic cylinder 29, and the hydraulic cylinder 29 is fixedly communicated with the tail end of the oil pipeline 8 and serves as a hydraulic drive power source in the prior art.
In this embodiment, the top end surface of the partition 26 is flush with the top surface of the bottom case 1 of the transmission main body, so that when the top cover 5 covers the upper portion of the bottom case 1 of the transmission main body, the partition 26 does not cause the sealing effect of the cover on the top cover 5.
In this embodiment, the top cover 5 covers the top of the bottom case 1 of the transmission main body, and four corners of the top cover 5 are fixedly connected with the bottom case 1 of the transmission main body through fixing bolts 6.
In this embodiment, the bolt holes 28 with the adaptation of fixing bolt 6 are all seted up to transmission main part drain pan 1 top four corners department, when carrying out fixed connection, can cover transmission main part drain pan 1 and top cap 5 through the bolt hole 28 cooperation through fixing bolt 6 and close fixedly.
When the hydraulic mechanical stepless transmission device for the loader is used, it should be noted that the invention is a hydraulic mechanical stepless transmission device for the loader, which comprises a transmission main body bottom shell 1, a mounting hole 2, a machine foot frame 3, a right transmission box 4, a top cover 5, a fixing bolt 6, a left transmission box 7, an oil pipeline 8, an oil pump 9, an inverted L-shaped steel frame 10, a shield 11, an oil inlet pipe 12, an inverted U-shaped notch 13, a mounting hole 14, a threaded screw rod 15, a nut 16, a groove 17, a first bearing 18, a left follower gear 19, a transmission shaft rod 20, a second bearing 21, a left spline shaft 22, a driving transmission spline shaft 23, a right spline shaft 24, a right drive gear 25, a partition plate 26, a main shaft 27, a bolt hole 28, a hydraulic cylinder 29 and a counter shaft 30, wherein the components are all common standard components or components known by those skilled in the, the structure and principle are known to the skilled person through technical manuals or through routine experimentation.
When the transmission device is used, the rear part of the bottom shell 1 of the transmission main body is covered with the protective cover 11, the middle part of one side of the protective cover 11, which is far away from the bottom shell 1 of the transmission main body, is vertically provided with the mounting hole 14, the mounting hole 14 is movably penetrated through the threaded lead screw 15, the threaded lead screw 15 is screwed with the nut 16, the protective cover 11 is covered at the rear end part of the bottom shell 1 of the transmission main body to protect the oil pump 9 and avoid the problem that the oil pump 9 is always exposed outside and collided to cause the reduction of the service life, the main shaft 27 and the auxiliary shaft 30 which are positioned in front of the clapboard 26 are respectively fixed with the left following gear 19 and the right driving gear 25, opposite sides of the left following gear 19 and the right driving gear 25 are mutually meshed, the left spline shaft 22 and the right spline 24 are respectively meshed with the driving spline 23 at the front ends of the auxiliary shaft 30 and the main shaft 27 through the meshing transmission of the left following gear 19 and the right, therefore, the transmission shaft rod 20 on the left spline shaft 22 and the right spline shaft 24 is driven to rotate in the same direction, the best mechanical transmission effect is achieved, the auxiliary shaft 30 and the main shaft 27 which are fixed with the left follow-up gear 19 and the right driving gear 25 are ensured to rotate oppositely or oppositely, the problem of great mechanical power loss caused by the belt or chain transmission mode in the prior art is solved, and the transmission efficiency is obviously improved.
While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (8)
1. The utility model provides a hydraulic pressure machinery stepless transmission for loader, includes transmission main part drain pan (1), its characterized in that: a left transmission box (7) and a right transmission box (4) are fixedly arranged on the left side wall and the right side wall of the transmission main body bottom shell (1) in a distributed manner; an inverted L-shaped steel frame (10) is vertically and fixedly connected to the left side of the rear part of a transmission main body bottom shell (1), an oil pump (9) is fixedly installed on the right side of the inverted L-shaped steel frame (10), an oil inlet of the oil pump (9) is fixedly communicated with an oil inlet pipe (12), an oil outlet of the oil pump (9) is fixedly communicated with the head end of an oil conveying pipe (8), a threaded screw rod (15) is vertically welded in the middle of the top of the inverted L-shaped steel frame (10), a protective cover (11) covers the rear part of the transmission main body bottom shell (1), a mounting hole (14) is vertically formed in the middle of one side, away from the transmission main body bottom shell (1), of the protective cover (11), the mounting hole (14) is movably penetrated through the threaded screw rod;
a partition plate (26) is transversely and vertically and integrally arranged in the middle of the inner cavity of the bottom shell (1) of the transmission main body, two first bearings (18) which are symmetrically distributed about a middle dividing line of the partition plate (26) are vertically embedded and fixed on the partition plate (26), and a counter shaft (30) and a main shaft (27) vertically penetrate through the middle shafts of the two first bearings (18); the end parts of the main shaft (27) and the auxiliary shaft (30) are both transversely fixed with a driving transmission spline shaft (23), a left follow-up gear (19) and a right driving gear (25) are respectively fixed on the main shaft (27) and the auxiliary shaft (30) which are positioned in front of the clapboard (26), and the opposite sides of the left follow-up gear (19) and the right driving gear (25) are mutually meshed;
and a second bearing (21) is embedded and fixed on the side wall of the transmission main body bottom shell (1) in the middle area of the left transmission box (7) and the right transmission box (4), a transmission shaft rod (20) horizontally penetrates through the middle shaft of the second bearing (21), a left spline shaft (22) and a right spline shaft (24) are respectively fixed at one opposite ends of the transmission shaft rod (20) in the left transmission box (7) and the right transmission box (4), and the left spline shaft (22) and the right spline shaft (24) are respectively meshed with the active transmission spline shaft (23) at the front ends of the auxiliary shaft (30) and the main shaft (27).
2. The hydromechanical continuously variable transmission for a loader according to claim 1, characterized in that: the side of the middle part of the left side and the right side of the transmission main body bottom shell (1) is horizontally aligned and welded with the machine foot stand (3), and one end, far away from the transmission main body bottom shell (1), of the machine foot stand (3) is vertically provided with a mounting hole (2).
3. The hydromechanical continuously variable transmission for a loader according to claim 1, characterized in that: an inverted U-shaped notch (13) is vertically formed in the lower middle of the right side of the protective cover (11), the inverted U-shaped notch (13) is movably sleeved with the oil inlet pipe (12), and the protective cover (11) is formed by compression molding of manganese steel.
4. The hydromechanical continuously variable transmission for a loader according to claim 1, characterized in that: the upper parts of the front side wall and the rear side wall of the protective cover (11) are both horizontally provided with grooves (17).
5. The hydromechanical continuously variable transmission for a loader according to claim 1, characterized in that: the rear end part of the main shaft (27) is in transmission connection with a hydraulic cylinder (29), and the hydraulic cylinder (29) is fixedly communicated with the tail end of the oil conveying pipe (8).
6. The hydromechanical continuously variable transmission for a loader according to claim 1, characterized in that: the top end surface of the clapboard (26) is flush with the top surface of the transmission main body bottom shell (1).
7. The hydromechanical continuously variable transmission for a loader according to claim 1, characterized in that: the top of the transmission main body bottom shell (1) is covered with a top cover (5), and four corners of the top cover (5) are fixedly connected with the transmission main body bottom shell (1) through fixing bolts (6).
8. The hydromechanical continuously variable transmission for a loader according to claim 7, characterized in that: and bolt holes (28) matched with the fixing bolts (6) are formed in four corners of the top of the transmission main body bottom shell (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910762275.1A CN110454560B (en) | 2019-08-19 | 2019-08-19 | Hydraulic mechanical stepless transmission device for loader |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910762275.1A CN110454560B (en) | 2019-08-19 | 2019-08-19 | Hydraulic mechanical stepless transmission device for loader |
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| Publication Number | Publication Date |
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| CN110454560A CN110454560A (en) | 2019-11-15 |
| CN110454560B true CN110454560B (en) | 2020-11-20 |
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| CN201910762275.1A Active CN110454560B (en) | 2019-08-19 | 2019-08-19 | Hydraulic mechanical stepless transmission device for loader |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2900776A1 (en) * | 1979-01-10 | 1980-07-24 | Kibo Kommunalmasch Gmbh & Co | MECHANICAL-HYDROSTATIC REVERSE TRANSMISSION FOR SWEEPERS |
| US6601474B2 (en) * | 2000-09-05 | 2003-08-05 | Kanzaki Kokyukoki Mfg. Co., Ltd. | Hydrostatic transmission and power train for vehicle |
| CN101158392A (en) * | 2007-06-11 | 2008-04-09 | 赵宏坚 | Mechanical-hydraulic composite transmission mechanism |
| CN205298454U (en) * | 2015-11-11 | 2016-06-08 | 潍柴动力股份有限公司 | Hydraulic pressure machinery infinitely variable transmission for loader |
| CN206175597U (en) * | 2016-11-20 | 2017-05-17 | 临海市高级职业中学 | Farm machinery hydraulic pressure machinery infinitely variable speed case |
| CN208503383U (en) * | 2018-06-14 | 2019-02-15 | 德州学院 | A kind of vehicle hydraulic mechanical stepless transmission device |
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2019
- 2019-08-19 CN CN201910762275.1A patent/CN110454560B/en active Active
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