CN216895628U - Hydraulic transmission case - Google Patents

Abstract

The utility model discloses a hydraulic transmission case, which comprises a case body, wherein a torque converter, a first transmission shaft, a second transmission shaft and a third transmission shaft are arranged in the case body, and one end of the first transmission shaft is connected with the torque converter; all install two sets of clutches on first transmission shaft and the second transmission shaft, first transmission shaft and second transmission shaft all are connected with the third transmission shaft through the clutch, connect through gear drive between first transmission shaft and the second transmission shaft, the clutch includes the clutch case, the pressure disk, a plurality of outer friction pieces, a plurality of inner friction piece and pressure disk reset spring, a plurality of outer friction pieces and a plurality of inner friction piece set up one by one in turn, a plurality of outer friction pieces all rotate with the clutch case synchronous, the clutch case with install epaxial gear fixed connection at the transmission, and the piston chamber that is used for driving the pressure disk sets up between gear and pressure disk, the transverse length of transmission case has been reduced like this, and then the turning radius who makes the vehicle diminishes.

Description

Hydraulic transmission case

Technical Field

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

Background

With the development of logistics economy in China, the forklift is more commonly used, and the design and the manufacture of a transmission case of the forklift are gradually mature. The transmission case is one of the main transmission systems of the forklift, and the volume, the shafting position, the speed ratio and the like of the transmission case all influence the driving performance of the vehicle.

Patent document No. CN201599380U discloses a hydraulic transmission box, which includes a hydraulic torque converter, the hydraulic torque converter is connected with a gear shifting transmission box, a forward I-gear clutch, a forward II-gear clutch, a backward I-gear clutch and a backward II-gear clutch are disposed in the gear shifting transmission box, an electromagnetic control valve for hydraulically controlling the forward and backward clutches is disposed in the gear shifting transmission box, 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 transmission box, 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, a forward I-gear clutch and a forward II-gear clutch are positioned between a forward I-gear and a forward II-gear, so that the transverse distance between the gears is increased, the total length of the whole transmission case is longer, and the turning radius of a vehicle is overlarge.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem that the turning radius of a vehicle is large due to the fact that the transmission case is long in transverse length in the prior art, the utility model aims to provide the hydraulic transmission case.

In order to achieve the purpose, the utility model adopts the following technical scheme: a hydraulic transmission case comprises a shell, a torque converter, a first transmission shaft, a second transmission shaft and a third transmission shaft, wherein the torque converter, the first transmission shaft, the second transmission shaft and the third transmission shaft are all arranged in the shell, and one end of the first transmission shaft is in transmission connection with the torque converter; the first transmission shaft and the second transmission shaft are respectively provided with two groups of clutches, each 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 plurality of outer friction plates and the plurality of inner friction plates are alternately arranged one by one, the plurality of outer friction plates and the clutch cover synchronously rotate, the two groups of clutches arranged on the first transmission shaft are respectively a forward I-gear clutch and a forward II-gear clutch, the first transmission shaft is integrally formed or fixedly connected with a first transmission gear, the first transmission shaft is also sleeved with a forward I-gear and a forward II-gear, the forward I-gear and the forward II-gear are respectively positioned at two sides of the first transmission gear, and the forward I-gear and the forward II-gear are respectively in transmission connection with a third transmission shaft; a clutch cover of the forward I-gear clutch is fixedly connected with the first transmission gear, an inner friction plate of the forward I-gear clutch is installed on an extending part of the forward I-gear and synchronously rotates with the forward I-gear, and a piston cavity for introducing pressure oil is formed between a pressure plate of the forward I-gear clutch and the first transmission gear; a clutch cover of the forward II-gear clutch is fixed on the first transmission shaft, an inner friction plate of the forward II-gear clutch is installed on an extension part of the forward II-gear and rotates synchronously with the forward II-gear, and a piston cavity for introducing pressure oil is formed between a pressure plate of the forward II-gear clutch and the clutch cover; the clutch arranged on the second transmission shaft is a backward I-gear clutch and a backward II-gear clutch, the second transmission shaft is integrally formed or fixedly connected with a second transmission gear, the second transmission gear is in meshed transmission with the first transmission gear, the backward I-gear and the backward II-gear are also sleeved on the second transmission shaft in an empty way, and the backward I-gear and the backward II-gear are both in transmission connection with a third transmission shaft; a clutch cover of the first-gear backward clutch is fixedly connected with the second transmission gear, an inner friction plate of the first-gear backward clutch is installed on an extending part of the first-gear backward gear and synchronously rotates with the first-gear backward gear, and a piston cavity for introducing pressure oil is formed between a pressure plate of the first-gear backward clutch and the second transmission gear; a clutch cover of the backward II-gear clutch is fixed on a second transmission shaft, an inner friction plate of the backward II-gear clutch is installed on an extending part of a backward II-gear and rotates synchronously with the backward II-gear, and a piston cavity for introducing pressure oil is formed between a pressure plate of the forward and backward II-gear clutch and the clutch cover. So set up, above-mentioned clutch is one way clutch to form the piston chamber that is used for letting in pressure oil between the pressure disk of I shelves of advancing clutch and the first drive gear, retreat and form the piston chamber that is used for letting in pressure oil between the pressure disk of I shelves of clutch and the second drive gear, make the transverse length of transmission case shorten, and then make the turning radius of vehicle diminish.

Preferably, the third transmission shaft is fixedly connected with or integrally formed with a first-gear output I-gear and a second-gear output II-gear, the forward first-gear and the backward first-gear are in meshing transmission with the first-gear output gear, and the forward second-gear and the backward second-gear are in meshing transmission with the second-gear output gear. Thus, the output of the transmission case is ensured to be stable.

Preferably, a pressure plate return spring of the first-gear clutch is sleeved on the first transmission shaft, one end of the pressure plate return spring of the first-gear clutch is abutted against a pressure plate of the first-gear clutch, and the other end of the pressure plate return spring of the first-gear clutch is abutted against the first transmission shaft in a limiting mode through a retaining ring. Thus, the structure inside the transmission case is more compact.

Preferably, the pressure plate return spring of the forward II-gear clutch is sleeved on the extension part of the clutch cover of the forward II-gear clutch, one end of the pressure plate return spring of the forward II-gear clutch abuts against the pressure plate of the forward II-gear clutch, and the other end of the pressure plate return spring of the forward II-gear clutch abuts against the clutch cover of the forward II-gear clutch in a limiting manner through the retaining ring. In this way, the structure inside the transmission case is made more compact.

Preferably, the clutch further comprises a baffle plate, the baffle plate is installed on the clutch cover, and the plurality of outer friction plates and the plurality of inner friction plates are located between the baffle plate and the pressure plate. Therefore, the movement of the clutch is more stable and safer.

Preferably, the transmission case further comprises a power shaft, the power shaft is rotatably mounted on the housing, an oil pump is mounted on the housing, one end of the power shaft is connected with the oil pump, a power gear is mounted on the power shaft, a driving gear is mounted on the torque converter, and the power gear is in transmission connection with the driving gear through an idler gear. Therefore, the transmission case independently completes the driving of the torque converter, and the practicability of the transmission case is improved.

Preferably, an output flange is arranged at one end of the third transmission shaft, a connecting hole is formed in one end of the third transmission shaft, an external spline is arranged on the outer circular surface of the connecting part of the output flange, an internal spline is arranged in the connecting hole of the third transmission shaft, and the output flange and the third transmission shaft are connected in an inserting mode through the internal spline and the external spline. Therefore, the connecting structure between the output flange and the third transmission shaft is simplified, the total length of the third transmission shaft and the output flange is shorter, and the transverse length of the transmission case is further reduced.

Preferably, the connecting part of the output flange is sleeved with an oil seal, and the oil seal plugs the connecting hole of the third transmission shaft. Like this, can prevent that external impurity from getting into the connecting hole in, guarantee that the connecting hole is inside clean, the output flange can not receive the influence of external dust granule, and the output flange is connected the face with the third transmission shaft and only need adds once lubricating grease to can prolong the life of output flange.

As preferred, the casing includes left side casing and right side casing, left side casing and right side casing fixed connection, the first transmission chamber of opening left has been seted up on the casing of right side, the left side shutoff of left side casing with first transmission chamber, first transmission shaft, second transmission shaft and third transmission shaft all set up at first transmission intracavity, first transmission shaft, second transmission shaft and third transmission shaft are connected with left side casing and right side casing through the bearing respectively, be equipped with the second transmission chamber in the casing of left side, the one end of first transmission shaft gets into and is connected with the torque converter behind the second transmission chamber. Like this, establish the part branch in two casings, the installation and the location of the transmission incasement part of being convenient for improve the equipment precision and the efficiency of transmission case.

Preferably, an opening communicated with the second transmission cavity is formed in the left shell, a connecting plate is fixed at the opening, and the torque converter is connected with the left shell through the connecting plate. In this way, the mounting of the torque converter is facilitated.

The technical scheme of the utility model has the beneficial effects that: 1) the transmission case is provided with two forward gears and two backward gears through two sets of forward clutches and two sets of backward clutches, the clutches in the scheme are all one-way clutches, a clutch cover of the forward I-gear clutch is fixedly connected with the first transmission gear, a piston cavity for introducing pressure oil is formed between a pressure plate of the forward I-gear clutch and the first transmission gear, the required length of the forward I-gear clutch is further reduced, the distance between the forward I-gear and the forward II-gear is reduced, the transverse length of the transmission case is shortened, and the turning radius of a vehicle is reduced; 2) the shell in the scheme is divided into a left shell and a right shell, the power shaft and the torque converter are both arranged on the left shell, and the first transmission shaft, the second transmission shaft and the third transmission shaft are all arranged in the right shell, so that the assembly of the transmission case is facilitated, the positioning of components in the assembly process is facilitated, and the assembly efficiency and the assembly precision of the transmission case are improved; 3) in this scheme, the output flange is pegged graft with the one end of third transmission shaft, compares the horizontal length that can reduce transmission shaft and output flange with prior art this scheme, and then the horizontal length that has shortened the transmission case makes the turning radius of messenger's vehicle diminish to the person still is equipped with the oil blanket between the two, can increase the life of output flange.

Drawings

FIG. 1 is a first schematic structural diagram of a hydraulic transmission case;

FIG. 2 is a schematic structural diagram of a hydraulic transmission case II;

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

fig. 4 is a schematic view of a connection structure of the first transmission shaft and the clutch.

Reference numerals are as follows: 11. a right side housing; 111. a first transmission cavity; 12. a left side housing; 121. a second drive chamber; 122. an opening; 123. a first power take-off; 2. a torque converter; 21. a drive gear; 22. a connecting plate; 23. an idler pulley; 3. a first drive shaft; 31. a forward first-gear clutch; 311. a forward first gear; 32. a forward II clutch; 321. a forward II gear; 33. a first drive gear; 4. a second drive shaft; 41. a reverse first-gear clutch; 411. backward moving the first gear; 42. retreating the II-gear clutch; 421. backward moving the gear of the second gear; 43. a second transmission gear; 5. a third drive shaft; 50. connecting holes; 51. outputting a first gear; 52. outputting a gear of II gear; 6. an output flange; 61. a connecting portion; 62. oil sealing; 7. a power shaft; 71. a power gear; 8. an oil pump; 81. a second power take-off; 91. a clutch cover; 93. a platen; 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 otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. 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.

A hydraulic transmission box as shown in fig. 1-4 comprises a shell, a torque converter 2, a first transmission shaft 3, a second transmission shaft 4 and a third transmission shaft 5, wherein the torque converter 2, the first transmission shaft 3, the second transmission shaft 4 and the third transmission shaft 5 are all arranged in the shell, and one end of the first transmission shaft 3 is in transmission connection with the torque converter 2; the first transmission shaft 3 and the second transmission shaft 4 are respectively provided with two groups of clutches, each clutch comprises a clutch cover 91, a pressure plate 93, a plurality of outer friction plates 94, a plurality of inner friction plates 95 and a pressure plate return spring 96, the plurality of outer friction plates 94 and the plurality of inner friction plates 95 are arranged one by one alternately, the plurality of outer friction plates 94 and the clutch cover 91 synchronously rotate, the two groups of clutches arranged on the first transmission shaft 3 are respectively a forward I-gear clutch 31 and a forward II-gear clutch 32, the first transmission shaft 3 is integrally formed or fixedly connected with a first transmission gear 33, the first transmission shaft 3 is also sleeved with a forward I-gear 311 and a forward II-gear 321 in a hollow way, the forward I-gear 311 and the forward II-gear 321 are respectively positioned at two sides of the first transmission gear 33, and the forward I-gear 311 and the forward II-gear 321 are respectively in transmission connection with the third transmission shaft 5; a clutch cover of the forward I-gear clutch 31 is fixedly connected with the first transmission gear 33, an inner friction plate of the forward I-gear clutch 31 is installed on an extension part of the forward I-gear 311 and synchronously rotates with the forward I-gear 311, and a piston cavity for introducing pressure oil is formed between a pressure plate of the forward I-gear clutch 31 and the first transmission gear 33; a clutch cover of the forward II-gear clutch 32 is fixed on the first transmission shaft 3, an inner friction plate of the forward II-gear clutch 32 is installed on an extension part of the forward II-gear 321 and rotates synchronously with the forward II-gear 321, and a piston cavity for introducing pressure oil is formed between a pressure plate of the forward II-gear clutch 32 and the clutch cover; the clutches arranged on the second transmission shaft 4 are a backward I-gear clutch 41 and a backward II-gear clutch 42, a second transmission gear 43 is integrally formed or fixedly connected on the second transmission shaft 4, the second transmission gear 43 is in meshed transmission with the first transmission gear 33, a backward I-gear 411 and a backward II-gear 421 are also sleeved on the second transmission shaft 4 in an empty way, and the backward I-gear 411 and the backward II-gear 421 are both in transmission connection with the third transmission shaft 5; a clutch cover of the backward I-gear clutch 41 is fixedly connected with the second transmission gear 43, an inner friction plate of the backward I-gear clutch 41 is installed on an extension part of the backward I-gear 411 and synchronously rotates with the backward I-gear 411, and a piston cavity for introducing pressure oil is formed between a pressure plate of the backward I-gear clutch 41 and the second transmission gear 43; the clutch cover of the backward II-gear clutch 42 is fixed on the second transmission shaft 4, the inner friction plate of the backward II-gear clutch 42 is installed on the extension part of the backward II-gear 421 and rotates synchronously with the backward II-gear 421, and a piston cavity for introducing pressure oil is formed between the pressure plate of the forward and backward II-gear clutch 42 and the clutch cover. The arrangement ensures that the transverse length of the transmission case is shorter and the turning radius of the vehicle is smaller; the clutches are all one-way clutches, and the first transmission gear and the second transmission gear are convenient for installation and positioning of the clutches.

In this embodiment, the forward i-speed gear 311 is located on the left side of the forward i-speed clutch 31, the forward ii-speed gear 321 is located on the left side of the forward ii-speed clutch 32, the reverse i-speed gear 411 is located on the left side of the reverse i-speed clutch 41, and the reverse ii-speed gear 421 is located on the left side of the reverse ii-speed clutch 42. In other embodiments, forward i-range gear 311 is located to the right of forward i-range clutch 31, forward ii-range gear 321 is located to the right of forward ii-range clutch 32, reverse i-range gear 411 is located to the right of reverse i-range clutch 41, and reverse ii-range gear 421 is located to the right of reverse ii-range clutch 42. In other embodiments, forward i-range gear 311 and forward ii-range gear 321 are located between forward i-range clutch 31 and forward ii-range clutch 32; the reverse i-speed gear 311 and the reverse ii-speed gear 421 are located between the reverse i-speed clutch 31 and the reverse ii-speed clutch 32. So set up, can reduce the horizontal interval of two adjacent gears on the same axle, shorten the overall length of transmission case to reduce the turning radius of vehicle. 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 third transmission shaft 5 is fixedly connected with or integrally formed with a first-gear output i-gear 51 and an output ii-gear 52, the forward i-gear 311 and the reverse i-gear 411 are both in meshing transmission with the output i-gear 51, and the forward ii-gear 321 and the reverse ii-gear 421 are both in meshing transmission with the output ii-gear 52.

In this embodiment, the pressure plate return spring of the forward first-gear clutch 31 is sleeved on the first transmission shaft 3, one end of the pressure plate return spring of the forward first-gear clutch 31 abuts against the pressure plate of the forward first-gear clutch 31, and the other end of the pressure plate return spring of the forward first-gear clutch 31 is in limit abutment with the first transmission shaft 3 through the check ring; a pressure plate reset spring of the forward II-gear clutch 32 is sleeved on an extension part of a clutch cover of the forward II-gear clutch 32, one end of the pressure plate reset spring of the forward II-gear clutch 32 is abutted against a pressure plate of the forward II-gear clutch 32, and the other end of the pressure plate reset spring of the forward II-gear clutch 32 is in limited abutment with the clutch cover of the forward II-gear clutch 32 through a check ring; a pressure plate return spring of the backing first-gear clutch 31 is sleeved on the second transmission shaft 4, one end of the pressure plate return spring of the backing first-gear clutch 31 abuts against a pressure plate of the backing first-gear clutch 31, and the other end of the pressure plate return spring of the backing first-gear clutch 31 is in limit abutment with the second transmission shaft 4 through a check ring; the pressure plate return spring of the backward II-gear clutch 32 is sleeved on the extension part of the clutch cover of the backward II-gear clutch 32, one end of the pressure plate return spring of the backward II-gear clutch 32 is abutted against the pressure plate of the backward II-gear clutch 32, and the other end of the pressure plate return spring of the backward II-gear clutch 32 is in limited abutment with the clutch cover of the backward II-gear clutch 32 through a retaining ring. So set up for the structure of transmission case is compacter, reduces the required volume of transmission case.

In this embodiment, the outer diameter of the forward first-gear 311 is larger than the outer diameter of the forward second-gear 321; the outer diameter of the backward I-gear 411 is larger than that of the backward II-gear 421; the outer diameter of the forward I-gear 311 is larger than that of the reverse I-gear 411; the outer diameter of the forward ii-speed gear 321 is larger than that of the reverse ii-speed gear 421. So set up for the power take off of transmission case is more stable.

In this embodiment, an output flange 6 is disposed at one end of the third transmission shaft 5, a connection hole 50 is formed at one end of the third transmission 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, can further reduce the overall length of output flange 6 and third transmission shaft 5, further reduce the lateral length of transmission case, reduce the required turning radius of vehicle. 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 third transmission shaft 5, and the output flange 6 and the third transmission shaft 5 are connected in an inserting mode through the inner spline and the outer spline. Further, an oil seal 62 is sleeved on the connecting portion 61 of the output flange 6, and the oil seal 62 blocks the connecting hole 50 of the third transmission shaft 5. So set up, can prevent that external impurity from getting into in connecting hole 50, guarantee that connecting hole 50 is inside clean, output flange 6 can not receive the influence of external dust granule, and output flange 6 is connected the face with third transmission shaft 5 and only need add once lubricating grease to can prolong output flange 6's life.

In this embodiment, the transmission case further includes a power shaft 7, the power shaft 7 is rotatably installed on the housing, the housing is provided with an oil pump 8, one end of the power shaft 7 is connected with the oil pump 8, the power shaft 7 is provided with a power gear 71, the torque converter 2 is provided with a drive gear 21, and the power gear 71 is in transmission connection with the drive gear 21 through an idler 23. Further, a first power take-off port 123 is formed in the housing, a second power take-off port 81 is formed in the oil pump 8, and two ends of the power 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 acquire the produced power of oil pump through arbitrary power takeoff mouth, the hydraulic means's of being convenient for connection and the arranging of whole car.

In this embodiment, the casing includes left side casing 12 and right side casing 11, left side casing 12 and right side casing 11 fixed connection, first transmission chamber 111 that the opening left has been seted up on the casing 11 of right side, left side casing 12 is with the left side shutoff in first transmission chamber 111, first transmission shaft 3, second transmission shaft 4 and third transmission shaft 5 all set up in first transmission chamber 111, first transmission shaft 3, second transmission shaft 4 and third transmission shaft 5 are connected with left side casing 12 and right side casing 11 through the bearing respectively, be equipped with second transmission chamber 121 in the casing 12 of left side, torque converter 2 and power shaft 7 are all installed in the second transmission chamber, oil pump 8 is installed on left side casing 12, the one end of first transmission shaft 3 gets into and is connected with torque converter 2 behind the second transmission chamber 121. So set up, the equipment of the transmission case of being convenient for improves the packaging efficiency of transmission case. Further, an opening 122 communicated with the second transmission chamber 121 is formed in the left side housing 12, a connecting plate 22 is fixed to the opening 122, and the torque converter 2 is connected to the left side housing 12 through the connecting plate 22. So set up, be convenient for torque converter's installation and location.

In this embodiment, the transmission process of the hydraulic transmission case is as follows: the oil pump 8 drives the power shaft 7 to rotate, the power shaft 7 drives the power gear 71 to rotate, the power gear 71 drives the driving gear 21 to rotate through the idle gear 23, and then the power gear 71 transmits power to the torque converter 2;

when the first gear of the transmission case advances, the advancing second-gear clutch 32, the retreating first-gear clutch 41 and the retreating second-gear clutch 42 all keep idling, the torque converter 2 drives the first transmission shaft 3 to rotate, the first transmission shaft 3 drives the advancing first-gear clutch 31 to rotate, the advancing first-gear clutch 31 drives the output first-gear 51 to rotate through the advancing first-gear 311, the output first-gear 51 drives the third transmission shaft 5 to rotate, the third transmission shaft 5 drives the output flange 6 to rotate, and then the transmission case finishes the advancing power output of the first gear;

when the second gear of the transmission case advances, the advancing first-gear clutch 31, the retreating first-gear clutch 41 and the retreating second-gear clutch 42 all keep idling, the torque converter 2 drives the first transmission shaft 3 to rotate, the first transmission shaft 3 drives the advancing second-gear clutch 32 to rotate, the advancing second-gear clutch 32 drives the output second-gear 52 to rotate through the advancing second-gear 321, the output second-gear 52 drives the third transmission shaft 5 to rotate, the third transmission shaft 5 drives the output flange 6 to rotate, and then the transmission case finishes the advancing power output of the second gear;

when the first gear of the transmission case backs up, the first gear clutch 31, the second gear clutch 32 and the second gear clutch 42 all keep idle running, the torque converter 2 drives the first transmission shaft 3 to rotate, the first transmission shaft 3 drives the first transmission gear 33 to rotate, the first transmission gear 33 drives the second transmission gear 43 to rotate, the second transmission gear 43 drives the second transmission shaft 4 to rotate, the second transmission shaft 4 drives the first gear clutch 41 to rotate, the first gear clutch 41 drives the first gear 51 to rotate through the first gear 411, the first gear 51 drives the third transmission shaft 5 to rotate, the third transmission shaft 5 drives the output flange 6 to rotate, and the transmission case finishes the first gear back output;

when the second gear of the transmission case backs up, the forward first gear clutch 31, the forward second gear clutch 32 and the backward first gear clutch 41 all keep idle running, the torque converter 2 drives the first transmission shaft 3 to rotate, the first transmission shaft 3 drives the first transmission gear 33 to rotate, the first transmission gear 33 drives the second transmission gear 43 to rotate, the second transmission gear 43 drives the second transmission shaft 4 to rotate, the second transmission shaft 4 drives the backward second gear clutch 42 to rotate, the backward second gear clutch 42 drives the output second gear 52 to rotate through the backward second gear 421, the output second gear 52 drives the third transmission shaft 5 to rotate, the third transmission shaft 5 drives the output flange 6 to rotate, and then the transmission case finishes the backward output of the second gear.

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 (10)

1. A hydraulic transmission case comprises a shell, a torque converter (2), a first transmission shaft (3), a second transmission shaft (4) and a third transmission shaft (5), wherein the torque converter (2), the first transmission shaft (3), the second transmission shaft (4) and the third transmission shaft (5) are all arranged in the shell, and one end of the first transmission shaft (3) is in transmission connection with the torque converter (2); all install two sets of clutches on first transmission shaft (3) and second transmission shaft (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 its characterized in that with clutch case (91) synchronous: the two groups of clutches installed on the first transmission shaft (3) are a forward I-gear clutch (31) and a forward II-gear clutch (32), the first transmission shaft (3) is integrally formed or fixedly connected with a first transmission gear (33), the first transmission shaft (3) is also sleeved with a forward I-gear (311) and a forward II-gear (321), the forward I-gear (311) and the forward II-gear (321) are respectively positioned on two sides of the first transmission gear (33), and the forward I-gear (311) and the forward II-gear (321) are respectively in transmission connection with the third transmission shaft (5);

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

the clutch arranged on the second transmission shaft (4) is a retreating first-gear clutch (41) and a retreating second-gear clutch (42), a second transmission gear (43) is integrally formed or fixedly connected to the second transmission shaft (4), the second transmission gear (43) is in meshed transmission with the first transmission gear (33), a retreating first-gear (411) and a retreating second-gear (421) are further sleeved on the second transmission shaft (4) in an empty mode, and the retreating first-gear (411) and the retreating second-gear (421) are in transmission connection with the third transmission shaft (5);

a clutch cover of the first backward gear clutch (41) is fixedly connected with the second transmission gear (43), an inner friction plate of the first backward gear clutch (41) is installed on an extending part of the first backward gear (411) and synchronously rotates with the first backward gear (411), and a piston cavity for introducing pressure oil is formed between a pressure plate of the first backward gear clutch (41) and the second transmission gear (43); the clutch cover of the backward II-gear clutch (42) is fixed on the second transmission shaft (4), the inner friction plate of the backward II-gear clutch (42) is installed on the extending part of the backward II-gear (421) and rotates synchronously with the backward II-gear (421), and a piston cavity for introducing pressure oil is formed between the pressure plate of the forward and backward II-gear clutch (42) and the clutch cover.

2. A fluid drive case as defined in claim 1, wherein: a first-gear output first-gear (51) and an output second-gear (52) are fixedly connected to or integrally formed on the third transmission shaft (5), the forward first-gear (311) and the backward first-gear (411) are in meshing transmission with the output first-gear (51), and the forward second-gear (321) and the backward second-gear (421) are in meshing transmission with the output second-gear (52).

3. A fluid drive case as defined in claim 1, wherein: the pressure plate return spring of the advancing I-gear clutch (31) is sleeved on the first transmission shaft (3), one end of the pressure plate return spring of the advancing I-gear clutch (31) is abutted against the pressure plate of the advancing I-gear clutch (31), and the other end of the pressure plate return spring of the advancing I-gear clutch (31) is in limited abutment with the first transmission shaft (3) through a check ring.

4. A fluid drive case as defined in claim 1, wherein: the pressure plate reset spring of the forward II-gear clutch (32) is sleeved on the extension part of the clutch cover of the forward II-gear clutch (32), one end of the pressure plate reset spring of the forward II-gear clutch (32) is abutted against the pressure plate of the forward II-gear clutch (32), and the other end of the pressure plate reset spring of the forward II-gear clutch (32) is in limited abutment with the clutch cover of the forward II-gear clutch (32) through a check ring.

5. A fluid drive case as defined in claim 1, wherein: the clutch further comprises a baffle plate (97), the baffle plate (97) is installed on the clutch cover (91), and the outer friction plates (94) and the inner friction plates (95) are located between the baffle plate (97) and the pressure plate (93).

6. A fluid drive case as defined in claim 1, wherein: the transmission case further comprises a power shaft (7), the power shaft (7) is rotatably installed on the shell, an oil pump (8) is installed on the shell, one end of the power shaft (7) is connected with the oil pump (8), a power gear (71) is installed on the power shaft (7), a driving gear (21) is installed on the torque converter (2), and the power gear (71) is in transmission connection with the driving gear (21) through an idler (23).

7. A fluid drive case as defined in claim 1, wherein: one end of the third transmission shaft (5) is provided with an output flange (6), one end of the third transmission shaft (5) is provided with a connecting hole (50), an outer spline is arranged on the outer circular surface of the connecting part (61) of the output flange (6), an inner spline is arranged in the connecting hole (50) of the third transmission shaft (5), and the output flange (6) and the third transmission shaft (5) are connected in a splicing mode through the inner spline and the outer spline.

8. A fluid drive case as defined in claim 7, wherein: an oil seal (62) is sleeved on a connecting part (61) of the output flange (6), and the oil seal (62) blocks a connecting hole (50) of the third transmission shaft (5).

9. A fluid transmission housing as claimed in claim 1, wherein: the casing includes left side casing (12) and right side casing (11), left side casing (12) and right side casing (11) fixed connection, first transmission chamber (111) left of opening have been seted up on right side casing (11), left side casing (12) are with the left side shutoff in first transmission chamber (111), first transmission shaft (3), second transmission shaft (4) and third transmission shaft (5) all set up in first transmission chamber (111), first transmission shaft (3), second transmission shaft (4) and third transmission shaft (5) are connected with left side casing (12) and right side casing (11) through the bearing respectively, be equipped with second transmission chamber (121) in left side casing (12), the one end of first transmission shaft (3) gets into and is connected with torque converter (2) behind second transmission chamber (121).

10. A fluid drive case as defined in claim 9, wherein: an opening (122) communicated with the second transmission cavity (121) is formed in the left side shell (12), a connecting plate (22) is fixed at the opening (122), and the torque converter (2) is connected with the left side shell (12) through the connecting plate (22).

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