CN216895629U

CN216895629U - Hydraulic transmission

Info

Publication number: CN216895629U
Application number: CN202220156802.1U
Authority: CN
Inventors: 金刚强; 徐德良; 景诸刚; 秦海峰
Original assignee: Zhejiang Jindao Technology Co ltd
Current assignee: Zhejiang Jindao Technology Co ltd
Priority date: 2022-01-20
Filing date: 2022-01-20
Publication date: 2022-07-05
Anticipated expiration: 2032-01-20

Abstract

The utility model discloses a hydraulic transmission box which comprises a box body, wherein a torque converter, a forward shaft, a backward shaft and an output shaft are arranged in the box body, and one end of the forward shaft is connected with the torque converter; the axle that advances is installed with two sets of clutches, the axle that backs down all installs a set of clutch, the axle that advances and backs down all through clutch and output shaft, it connects through gear drive to advance between axle and the axle of backing down, the clutch includes the clutch case, the pressure disk, a plurality of outer friction pieces, a plurality of inner friction pieces and pressure disk reset spring, a plurality of outer friction pieces and a plurality of inner friction pieces set up one by one in turn, a plurality of outer friction pieces all with clutch case synchronous rotation, the clutch case with install advance the axle with back epaxial gear fixed connection in the front, and be used for driving the piston chamber setting of pressure disk between gear and pressure disk, the transverse length of gearbox has been reduced like this, and then the turning radius who makes the vehicle diminishes.

Description

Hydraulic transmission

Technical Field

The utility model relates to the field of forklifts, in particular to a hydraulic gearbox.

Background

With the development of logistics economy in China, the use of the forklift is more common, and the design and the manufacture of the forklift gearbox are gradually mature. The gearbox is used as one of main transmission systems of the forklift, the volume, the shafting position, the speed ratio and the like of the gearbox affect the running performance of a vehicle, and the existing domestic 4.5T-5T forklift gearbox generally has 4 groups of shafts, large volume and high transmission loss efficiency.

Patent document No. CN201599380U discloses a hydraulic transmission gearbox, which includes a hydraulic torque converter, the hydraulic torque converter is connected with a gear shifting gearbox, a forward I-gear clutch, a forward II-gear clutch, a backward I-gear clutch and a backward II-gear clutch are arranged in the gear shifting gearbox, an electromagnetic control valve for hydraulically controlling the forward gear and the backward clutch is arranged in the gear shifting gearbox, the electromagnetic control valve includes a speed control valve and a direction control valve, the speed control valve is connected with a speed selection slide valve, the speed selection slide valve is connected with the forward I-gear clutch, the forward II-gear clutch, the backward I-gear clutch and the backward II-gear clutch, the direction control valve is connected with the direction selection slide valve, and the direction control valve is connected with the forward I-gear clutch, the forward II-gear clutch, the backward I-gear clutch and the backward II-gear clutch. The hydraulic torque converter is connected with a forward I-gear clutch and a forward II-gear clutch on a forward shaft in the gear shifting gearbox, the forward I-gear clutch is connected with a forward I-gear, the forward I-gear is connected with an I-gear output gear, the I-gear output gear is connected with an output shaft, and the output shaft is connected with an output flange; the forward II gear clutch is connected with a forward II gear, the forward II gear is connected with a II gear output gear, the II gear output gear is connected with an output shaft, and the output shaft is connected with an output flange; the forward shaft is connected with a gear I, the gear I is connected with a gear II on the backward shaft, the gear II is connected with a backward I-gear clutch and a backward II-gear clutch, the backward I-gear clutch is connected with a backward I-gear, the backward I-gear is connected with an I-gear output gear, the I-gear output gear is connected with an output shaft, and the output shaft is connected with an output flange; the backward II-gear clutch is connected with a backward II-gear, the backward II-gear is connected with a II-gear output gear, the II-gear output gear is connected with an output shaft, and the output shaft is connected with an output flange.

In the prior art, the size of the gearbox is large, and the forward I-gear clutch and the forward II-gear clutch are positioned between the forward I-gear and the forward II-gear, so that the transverse distance between the gears is long; and the output flange and the output shaft are connected in a way that the total length of the whole gearbox is longer, so that the turning radius of the vehicle is overlarge.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems of longer gearbox assembly and larger turning radius of a vehicle in the prior art, the utility model aims to provide a hydraulic gearbox, which reduces the transverse distance between gears by changing the motion direction of a clutch and the connecting structure of an output shaft and an output flange, and achieves the purposes of reducing the total length of the gearbox and reducing the turning radius of wheels.

In order to achieve the purpose, the utility model adopts the following technical scheme: the device comprises a box body, a torque converter, a forward shaft, a backward shaft and an output shaft, wherein the torque converter, the forward shaft, the backward shaft and the output shaft are all arranged in the box body, and one end of the forward shaft is in transmission connection with the torque converter; the clutch comprises a clutch cover, a pressure plate, a plurality of outer friction plates, a plurality of inner friction plates and a pressure plate reset spring, the outer friction plates and the inner friction plates are arranged alternately one by one, the outer friction plates and the clutch cover synchronously rotate, the two groups of clutches arranged on the forward shaft are respectively a first-gear forward clutch and a second-gear forward clutch, the forward shaft is integrally formed or fixedly connected with a first transition gear, the forward shaft is also sleeved with a first-gear forward gear and a second-gear forward gear, the first-gear forward gear and the second-gear forward gear are respectively positioned at two sides of the first transition gear, and the first-gear forward gear and the second-gear forward gear are respectively in transmission connection with an output shaft; the clutch cover of the first-gear forward clutch is fixedly connected with the first transition gear, an inner friction plate of the first-gear forward clutch is installed on the extending part of the first-gear forward gear and rotates synchronously with the first-gear forward gear, and a piston cavity for introducing pressure oil is formed between a pressure plate of the first-gear forward clutch and the first transition gear; a clutch cover of the second-gear forward clutch is fixed on the forward shaft, an inner friction plate of the second-gear forward clutch is installed on an extending part of the second-gear forward gear and rotates synchronously with the second-gear forward gear, and a piston cavity for introducing pressure oil is formed between a pressure plate of the second-gear forward clutch and the clutch cover; the clutch arranged on the retreating shaft is a retreating clutch, a second transition gear is integrally formed or fixedly connected to the retreating shaft, the second transition gear is in meshing transmission with the first transition gear, the retreating shaft is also sleeved with a retreating gear in a hollow manner, and the retreating gear is in transmission connection with the output shaft; the clutch cover of the backward clutch is fixedly connected with the second transition gear, the inner friction plate of the backward clutch is installed on the extending part of the backward gear and rotates synchronously with the backward gear, and a piston cavity for introducing pressure oil is formed between the pressure plate of the backward clutch and the second transition gear. In this way, the clutch is a single-phase clutch, a piston cavity for introducing pressure oil is formed between the pressure plate of the first-gear forward clutch and the first transition gear, and a piston cavity for introducing pressure oil is formed between the pressure plate of the reverse clutch and the second transition gear, so that the distance between two adjacent gears on the same shaft is reduced, the transverse length of the transmission is also reduced, and the turning radius required by the vehicle is reduced.

Preferably, the output shaft is fixedly connected with or integrally formed with a first-gear output gear and a second-gear output gear, the first-gear forward gear and the reverse gear are in meshing transmission with the first-gear output gear, and the second-gear forward gear is in meshing transmission with the second-gear output gear.

Preferably, the outer diameter of the second forward gear is larger than the outer diameter of the first forward gear.

The outer diameter of the first gear forward gear is larger than that of the backward gear

Preferably, one end of the output shaft is provided with an output flange, one end of the output shaft is provided with a connecting hole, a connecting part protrudes from the output flange, and the connecting part is inserted into the connecting hole. Thus, the mounting structure of the output flange is simplified, the total length of the output shaft and the output flange can be reduced, the transverse length of the transmission is further reduced, and the turning radius required by a vehicle is reduced.

Preferably, the outer circular surface of the connecting part of the output flange is provided with an external spline, the connecting hole of the output shaft is internally provided with an internal spline, and the output flange and the output shaft are spliced through the internal spline and the external spline. In this way, the mounting and positioning of the output flange is facilitated.

Preferably, an oil seal is sleeved on the connecting part of the output flange, and the oil seal blocks the connecting hole of the output shaft. Like this, output flange and output shaft inscription and the place of external contact have the oil blanket dustproof for output flange can not receive the influence of external dust granule, and output flange and output shaft are connected the face and only need add lubricating grease once, just can prolong output flange's life.

Preferably, the gearbox further comprises a driving shaft, the driving shaft is rotatably mounted on the box body, the box body is provided with an oil pump, one end of the driving shaft is connected with the oil pump, the driving shaft is provided with a driving gear, the torque converter is provided with an input gear, and the driving gear is in transmission connection with the input gear through an idler gear. Therefore, the gearbox can directly drive the torque converter, and the practicability of the box is improved.

Preferably, the box body is provided with a first power take-off port, the oil pump is provided with a second power take-off port, and two ends of the driving shaft respectively enter the first power take-off port and the second power take-off port. In this way, the installation of the hydraulic device is facilitated.

As preferred, the box includes left side box and right side box, left side box and right side box fixed connection, set up the first transmission chamber of opening left on the box of right side, the left side box is with the left side shutoff in first transmission chamber, the advancing shaft, retreat the axle and the output shaft all sets up in first transmission chamber, the advancing shaft, retreat axle and output shaft and pass through bearing and left side box and right side box connection respectively, be equipped with second transmission chamber in the box of left side, the one end of advancing the axle gets into and is connected with the torque converter behind the second transmission chamber. Like this, be two parts through the structure branch of establishing the gearbox, the equipment of the gearbox of being convenient for improves the installation effectiveness of gearbox.

The technical scheme of the utility model has the beneficial effects that: 1) in the scheme, the clutches are all one-way clutches, a piston cavity for introducing pressure oil is formed between a pressure plate of the first-gear forward clutch and the first transition gear, and a piston cavity for introducing pressure oil is formed between a pressure plate of the backward clutch and the second transition gear, so that the distance between two adjacent gears on the same shaft is reduced, the transverse length of the transmission is reduced, and the turning radius required by the vehicle is reduced; 2) the gearbox body is divided into a left part and a right part, one part is used for mounting the torque converter, and the other part is used for mounting the forward shaft, the backward shaft and the output shaft, so that the assembly and the positioning of the transmission can be facilitated, and the assembly precision and the assembly efficiency are improved; 3) the box body and the oil pump are both provided with power take-off ports, and the hydraulic device can be connected with any power take-off port so as to obtain the power of the oil pump, thereby facilitating the arrangement of the whole vehicle and the connection of the hydraulic device; 4) the output flange is inserted at one end of the output shaft, so that the total length of the output shaft and the output flange is shorter, the transverse length of the transmission is further reduced, and the structure between the output flange and the output shaft is more compact.

Drawings

FIG. 1 is a schematic diagram of an overall structure of a hydraulic transmission;

FIG. 2 is a schematic diagram of an overall structure of a hydraulic transmission;

FIG. 3 is a schematic view of a connection structure of an output shaft and an output flange;

FIG. 4 is a schematic view of a connection structure of the forward shaft and the clutch.

Reference numerals: 11. a right box body; 111. a first transmission chamber; 12. a left box body; 121. a second drive chamber; 122. an opening; 123. a first power take-off; 2. a torque converter; 21. an input gear; 22. a connecting plate; 23. an idler pulley; 3. a forward shaft; 31. a first gear forward clutch; 311. a first-gear forward gear; 32. a second gear forward clutch; 321. a second-gear forward gear; 33. a first transition gear; 4. a retreat shaft; 41. a reverse clutch; 411. a reverse gear; 42. a second transition gear; 5. an output shaft; 50. connecting holes; 51. a first-gear output gear; 52. a second gear output gear; 6. an output flange; 61. a connecting portion; 62. oil sealing; 7. a drive shaft; 71. a drive gear; 8. an oil pump; 81. a second power take-off; 91. a clutch cover; 93. pressing a plate; 94. an outer friction plate; 95. an inner friction plate; 96. a pressure plate return spring; 97. a baffle plate.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless expressly stated or limited otherwise, the recitation of a first feature "on" or "under" a second feature may include the recitation of the first and second features being in direct contact, and may also include the recitation that the first and second features are not in direct contact, but are in contact via another feature between them. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The hydraulic transmission box shown in fig. 1-4 comprises a box body, a torque converter 2, a forward shaft 3, a backward shaft 4 and an output shaft 5, wherein the torque converter 2, the forward shaft 3, the backward shaft 4 and the output shaft 5 are all arranged in the box body, and one end of the forward shaft 3 is in transmission connection with the torque converter 2; install two sets of clutches on the advancing shaft 3, install a set of clutch on the axle 4 of retreating, the clutch includes clutch cover 91, pressure plate 93, a plurality of outer friction disc 94, a plurality of interior friction disc 95 and pressure plate reset spring 96, a plurality of outer friction disc 94 and a plurality of interior friction disc 95 set up one by one in turn, a plurality of outer friction disc 94 all rotate with clutch cover 91 is synchronous, the clutch still includes separation blade 97, separation blade 97 installs on clutch cover 91, a plurality of outer friction disc 94 and a plurality of interior friction disc 95 all are located between separation blade 97 and the pressure plate 93. The two groups of clutches installed on the forward shaft 3 are respectively a first-gear forward clutch 31 and a second-gear forward clutch 32, a first transition gear 33 is integrally formed or fixedly connected on the forward shaft 3, a first-gear forward gear 311 and a second-gear forward gear 321 are also sleeved on the forward shaft 3, the first-gear forward gear 311 and the second-gear forward gear 321 are respectively positioned at two sides of the first transition gear 33, and the first-gear forward gear 311 and the second-gear forward gear 321 are respectively in transmission connection with the output shaft 5; the clutch cover of the first-gear forward clutch 31 is fixedly connected with the first transition gear 33, an inner friction plate of the first-gear forward clutch 31 is installed on an extension part of the first-gear forward gear 311 and rotates synchronously with the first-gear forward gear 311, and a piston cavity for introducing pressure oil is formed between a pressure plate of the first-gear forward clutch 31 and the first transition gear 33; a clutch cover of the second-gear forward clutch 32 is fixed on the forward shaft 3, an inner friction plate of the second-gear forward clutch 32 is installed on an extension part of the second-gear forward gear 321 and rotates synchronously with the second-gear forward gear 321, and a piston cavity for introducing pressure oil is formed between a pressure plate of the second-gear forward clutch 32 and the clutch cover; the clutch arranged on the backward shaft 4 is a backward clutch 41, a second transition gear 42 is integrally formed or fixedly connected on the backward shaft 4, the second transition gear 42 is in meshed transmission with the first transition gear 33, a backward gear 411 is also sleeved on the backward shaft 4 in an empty way, and the backward gear 411 is in transmission connection with the output shaft 5; the clutch cover of the reverse clutch 41 is fixedly connected with the second transition gear 42, the inner friction plate of the reverse clutch 41 is mounted on the extension part of the reverse gear 411 and rotates synchronously with the reverse gear 411, and a piston cavity for introducing pressure oil is formed between the pressure plate of the reverse clutch 41 and the second transition gear 42. In this arrangement, the clutches are all one-way clutches, and a piston chamber for introducing pressure oil is formed between the pressure plate of the first forward clutch 31 and the first transition gear 33, and a piston chamber for introducing pressure oil is formed between the pressure plate of the reverse clutch 41 and the second transition gear 42, so that the distance between the first forward gear 311 and the second forward gear 321 is reduced, the lateral length of the transmission case is also reduced, and the turning radius of the vehicle is reduced. The process of driving the clutch to rotate is that the hydraulic device pushes pressure oil into the piston cavity, and the pressure oil pushes the pressure plate 93, so that the pressure plate 93, the outer friction plate 94 and the inner friction plate 95 are tightly abutted to each other, thus the outer friction plate 94 drives the inner friction plate 95 to rotate through friction force, and the inner friction plate 95 drives the gear to rotate.

In this embodiment, the pressure plate return spring of the first-gear forward clutch 31 is sleeved on the forward shaft 3, one end of the pressure plate return spring of the first-gear forward clutch 31 abuts against the pressure plate of the first-gear forward clutch 31, and the other end of the pressure plate return spring of the first-gear forward clutch 31 is in limit abutment with the forward shaft 3 through a retaining ring; a pressure plate return spring of the second gear forward clutch 32 is sleeved on an extension part of a clutch cover of the second gear forward clutch 32, one end of the pressure plate return spring of the second gear forward clutch 32 is abutted against a pressure plate of the second gear forward clutch 32, and the other end of the pressure plate return spring of the second gear forward clutch 32 is in limited abutment with the clutch cover of the second gear forward clutch 32 through a retaining ring; the pressure plate return spring of the reverse clutch 41 is fitted around the reverse shaft 4, one end of the pressure plate return spring of the reverse clutch 41 abuts against the pressure plate of the reverse clutch 41, and the other end of the pressure plate return spring of the reverse clutch 41 is in spacing abutment against the reverse shaft 4 through a retainer ring. So set up for gearbox inner structure is compacter.

In this embodiment, the first-gear output gear 51 and the second-gear output gear 52 are fixedly connected to or integrally formed with the output shaft 5, the first-gear forward gear 311 and the reverse gear 411 are both in meshing transmission with the first-gear output gear 51, and the second-gear forward gear 321 is in meshing transmission with the second-gear output gear 52.

In this embodiment, the outer diameter of the first forward gear 311 is larger than the outer diameter of the second forward gear 321; the outer diameter of the first-gear forward gear 311 is larger than that of the reverse gear 411; the outer diameter of the first forward gear 311 is larger than that of the reverse gear 411. So set up, make the power take off of gearbox more stable.

In this embodiment, an output flange 6 is disposed at one end of the output shaft 5, a connection hole 50 is formed at one end of the output shaft 5, a connection portion 61 protrudes from the output flange 6, and the connection portion 61 is inserted into the connection hole 50. So set up, simplify the connection structure of output flange and output shaft. Further, an outer spline is arranged on the outer circular surface of the connecting portion 61 of the output flange 6, an inner spline is arranged in the connecting hole 50 of the output shaft 5, and the output flange 6 and the output shaft 5 are connected in an inserted manner through the inner spline and the outer spline. So set up, be convenient for output flange's location and transmission. Further, an oil seal 62 is sleeved on the connecting portion 61 of the output flange 6, and the oil seal 62 seals the connecting hole 50 of the output shaft 5. So set up, can prevent that external impurity from getting into connecting hole 50 in, guarantee that connecting hole 50 is inside clean, output flange 6 can not receive external dust particle's influence, and output flange 6 is connected the face with third transmission shaft 5 and only need add lubricating grease once to can prolong output flange 6's life.

In this embodiment, the transmission further includes a driving shaft 7, the driving shaft 7 is rotatably mounted on the case, the case is provided with an oil pump 8, one end of the driving shaft 7 is connected with the oil pump 8, the driving shaft 7 is provided with a driving gear 71, the torque converter 2 is provided with an input gear 21, and the driving gear 71 is in transmission connection with the input gear 21 through an idler gear 23. So set up for the gearbox can be independent the completion to the drive of torque converter 2, improves the practicality of gearbox. Further, a first power take-off port 123 is formed in the box body, a second power take-off port 81 is formed in the oil pump 8, and two ends of the driving shaft 7 enter the first power take-off port 123 and the second power take-off port 81 respectively. So set up, hydraulic means can obtain the power of oil pump output through first power takeoff or second power takeoff, the hydraulic means's of being convenient for connection and the arrangement of whole car.

In this embodiment, the box shown in fig. 1 includes a left box 12 and a right box 11, the left box 12 is fixedly connected to the right box 11, the right box 11 is provided with a first transmission cavity 111 with a left opening, the left box 12 plugs the left end of the first transmission cavity 111, the output shaft 5, the backward shaft 4 and the forward shaft 3 are all arranged in the first transmission cavity 111, the forward shaft 3, the backward shaft 4 and the output shaft 5 are all connected to the left box 12 and the right box 11 through bearings, and the output port is arranged on the right box 11 and is communicated with the first transmission cavity 111; be equipped with second transmission chamber 121 on the left side box 12, opening 122 and power take-off 123 all communicate with second transmission chamber 121, and drive shaft 7, torque converter 2 and idler 23 all install in second transmission chamber 121, still are equipped with the through-hole on the left side box 12, and the through-hole makes first transmission chamber 111 and second transmission chamber 121 communicate, and the through-hole is passed to the one end of advancing shaft 3 and gets into second transmission chamber 121 and be connected with torque converter 2. So set up, the location and the installation of derailleur 2, forward shaft 3, retreat axle 4 and output shaft 5 are convenient for, provide good operational environment for torque converter 2, forward shaft 3, retreat axle 4 and output shaft 5.

In this embodiment, the motion process of the transmission is as follows: the oil pump 8 drives the driving shaft 7 to rotate, the driving shaft 7 drives the input gear 21 to rotate through the driving gear 71 and the idle gear 23, and the input gear 21 drives the torque converter to operate;

when the first gear of the gearbox moves forward, the second gear forward clutch 32 and the reverse clutch 41 idle, the first gear forward clutch 31 starts, the forward shaft 3 drives the first gear forward clutch 31 to rotate, the first gear forward clutch 31 drives the first gear output gear 51 to rotate through the first gear forward gear 311, the first gear output gear 51 drives the output shaft 5 to rotate, the output shaft 5 drives the output flange 6 to rotate, and then the gearbox finishes the first gear forward output;

when the second gear of the gearbox moves forward, the first gear forward clutch 31 and the reverse clutch 41 idle, the second gear forward clutch 32 starts, the forward shaft 3 drives the second gear forward clutch 32 to rotate, the second gear forward clutch 32 drives the second gear output gear 52 to rotate through the second gear forward gear 321, the second gear output gear 52 drives the output shaft 5 to rotate, the output shaft 5 drives the output flange 6 to rotate, and then the gearbox finishes second gear forward output;

when the transmission case moves backward, the first-gear forward clutch 31 and the second-gear forward clutch 32 idle, the forward shaft 3 drives the first transition gear 33 to rotate, the first transition gear 33 drives the second transition gear 42 to rotate, the second transition gear 42 drives the backward shaft 4 to rotate, the backward shaft 4 drives the backward clutch 41 to rotate, the backward clutch 41 is started, the backward clutch 41 drives the first-gear output gear 51 to rotate through the backward gear 411, the first-gear output gear 51 drives the output shaft 5 to rotate, the output shaft 5 drives the output flange 6 to rotate, and the output shaft finishes backward power output.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.

Claims

1. A hydraulic transmission comprises a box body, a torque converter (2), a forward shaft (3), a backward shaft (4) and an output shaft (5), wherein the torque converter (2), the forward shaft (3), the backward shaft (4) and the output shaft (5) are all installed in the box body, and one end of the forward shaft (3) is in transmission connection with the torque converter (2); install two sets of clutches on advancing axle (3), install a set of clutch on retreating axle (4), the clutch includes clutch case (91), pressure disk (93), a plurality of outer friction disc (94), a plurality of interior friction disc (95) and pressure disk reset spring (96), and a plurality of outer friction disc (94) and a plurality of interior friction disc (95) set up in turn one by one, and a plurality of outer friction disc (94) all rotate with clutch case (91) synchronous, its characterized in that:

the two groups of clutches installed on the forward shaft (3) are respectively a first-gear forward clutch (31) and a second-gear forward clutch (32), the forward shaft (3) is integrally formed or fixedly connected with a first transition gear (33), the forward shaft (3) is also sleeved with a first-gear forward gear (311) and a second-gear forward gear (321), the first-gear forward gear (311) and the second-gear forward gear (321) are respectively positioned on two sides of the first transition gear (33), and the first-gear forward gear (311) and the second-gear forward gear (321) are respectively in transmission connection with the output shaft (5);

a clutch cover of the first-gear forward clutch (31) is fixedly connected with the first transition gear (33), an inner friction plate of the first-gear forward clutch (31) is installed on an extending part of the first-gear forward gear (311) and rotates synchronously with the first-gear forward gear (311), and a piston cavity for introducing pressure oil is formed between a pressure plate of the first-gear forward clutch (31) and the first transition gear (33); a clutch cover of the second-gear forward clutch (32) is fixed on the forward shaft (3), an inner friction plate of the second-gear forward clutch (32) is installed on an extending part of the second-gear forward gear (321) and rotates synchronously with the second-gear forward gear (321), and a piston cavity for introducing pressure oil is formed between a pressure plate of the second-gear forward clutch (32) and the clutch cover;

the clutch installed on the backward shaft (4) is a backward clutch (41), a second transition gear (42) is integrally formed or fixedly connected to the backward shaft (4), the second transition gear (42) is in meshed transmission with the first transition gear (33), a backward gear (411) is also sleeved on the backward shaft (4) in an empty mode, and the backward gear (411) is in transmission connection with the output shaft (5);

a clutch cover of the backward clutch (41) is fixedly connected with the second transition gear (42), an inner friction plate of the backward clutch (41) is installed on an extending part of the backward gear (411) and rotates synchronously with the backward gear (411), and a piston cavity for introducing pressure oil is formed between a pressure plate of the backward clutch (41) and the second transition gear (42).

2. A hydrodynamic gearbox as claimed in claim 1, wherein: the output shaft (5) is fixedly connected with or integrally formed with a first-gear output gear (51) and a second-gear output gear (52), a first-gear forward gear (311) and a backward gear (411) are in meshing transmission with the first-gear output gear (51), and a second-gear forward gear (321) is in meshing transmission with the second-gear output gear (52).

3. A hydrodynamic gearbox as claimed in claim 1, wherein: the outer diameter of the first forward gear (311) is larger than that of the second forward gear (321).

4. A hydrodynamic gearbox as claimed in claim 1, wherein: the outer diameter of the first-gear forward gear (311) is larger than that of the reverse gear (411).

5. A hydrodynamic gearbox as claimed in claim 1, wherein: an output flange (6) is arranged at one end of the output shaft (5), a connecting hole (50) is formed in one end of the output shaft (5), a connecting portion (61) protrudes from the output flange (6), and the connecting portion (61) is inserted into the connecting hole (50).

6. A hydrodynamic gearbox according to claim 5, wherein: an external spline is arranged on the outer circular surface of the connecting part (61) of the output flange (6), an internal spline is arranged in the connecting hole (50) of the output shaft (5), and the output flange (6) and the output shaft (5) are spliced through the internal spline and the external spline.

7. A hydrodynamic gearbox according to claim 5, wherein: an oil seal (62) is sleeved on a connecting part (61) of the output flange (6), and the oil seal (62) seals a connecting hole (50) of the output shaft (5).

8. A hydrodynamic gearbox as claimed in claim 1, wherein: the gearbox further comprises a driving shaft (7), the driving shaft (7) is rotatably installed on the box body, an oil pump (8) is installed on the box body, one end of the driving shaft (7) is connected with the oil pump (8), a driving gear (71) is installed on the driving shaft (7), an input gear (21) is installed on the torque converter (2), and the driving gear (71) is in transmission connection with the input gear (21) through an idler gear (23).

9. A hydrodynamic gearbox according to claim 8, wherein: a first power take-off port (123) is formed in the box body, a second power take-off port (81) is formed in the oil pump (8), and two ends of the driving shaft (7) respectively enter the first power take-off port (123) and the second power take-off port (81).

10. A hydrodynamic gearbox as claimed in claim 1, wherein: the box includes left side box (12) and right side box (11), left side box (12) and right side box (11) fixed connection, first transmission chamber (111) of opening left side has been seted up on right side box (11), left side box (12) are with the left side shutoff in first transmission chamber (111), advancing axle (3), retreat axle (4) and output shaft (5) all set up in first transmission chamber (111), advancing axle (3) before, retreat axle (4) and output shaft (5) are connected with left side box (12) and right side box (11) through the bearing respectively, be equipped with second transmission chamber (121) in left side box (12), the one end of advancing axle (3) gets into behind second transmission chamber (121) and is connected with torque converter (2).