CN211737963U

CN211737963U - Transfer case and engineering machinery with same

Info

Publication number: CN211737963U
Application number: CN202020361183.0U
Authority: CN
Inventors: 刘秋宝; 汤志武; 李军华
Original assignee: Sany Automobile Manufacturing Co Ltd
Current assignee: Sany Automobile Manufacturing Co Ltd
Priority date: 2020-03-20
Filing date: 2020-03-20
Publication date: 2020-10-23
Anticipated expiration: 2030-03-20

Abstract

The utility model provides a transfer case and engineering machine tool who has transfer case. Wherein, the transfer case includes: a housing; the input shaft penetrates through the shell and is rotatably connected with the shell, two ends of the input shaft extend out of the shell, and one end of the input shaft is an input end and is used for being connected with an engine; the transmission assembly is rotatably sleeved on the input shaft and used for outputting power outwards, and one end of the transmission assembly, which is far away from the input end, extends outwards from the shell; the other end of input shaft is located to the cover, coupling assembling and input shaft sliding connection to can slide along the axial direction of input shaft, wherein, coupling assembling accessible axial slip realizes being connected or disconnection with drive assembly, and when coupling assembling is connected with drive assembly, the input shaft can drive assembly and rotate. Through the technical scheme of the utility model, can realize the engine unloaded start under low temperature environment, reduce the starting resistance of engine, transfer case simple structure is favorable to reduce cost.

Description

Transfer case and engineering machinery with same

Technical Field

The utility model relates to a transfer case technical field particularly, relates to a transfer case and an engineering machine tool.

Background

The transfer case is a common power transmission part and is an important component of a transmission system in the engineering machinery, and an engine of the engineering machinery can output power to a plurality of working systems or power demand devices through the transfer case. However, the more devices for taking power from the engine through the transfer case, the greater the load of the engine, and the difficulty in starting the engine is easily caused in a low-temperature environment, particularly in plateau and alpine regions, so that the normal work of the engineering machinery is affected. The transfer case with the clutch is provided in the prior art, so that the connection between the engine and each operating system and equipment is disconnected when the engine is started, but the transfer case in the prior technical scheme mostly adopts a hydraulic friction plate structure to realize the connection or disconnection, the structure and the connection mode are complex, the daily maintenance difficulty is high, the use cost is high, and under the normal weather condition, the hydraulic system of the hydraulic friction plate still needs to be in a working state, so that the engine can normally output power outwards, the energy waste is caused, the service life is shortened, and the maintenance cost is increased.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to at least one of the problems of the prior art or the related art.

Therefore, the utility model aims at providing a transfer case.

Another object of the present invention is to provide an engineering machine.

In order to achieve the above object, the technical solution of the first aspect of the present invention provides a transfer case, including: a housing; the input shaft penetrates through the shell and is rotatably connected with the shell, two ends of the input shaft extend out of the shell, and one end of the input shaft is an input end and is used for being connected with an engine; the transmission assembly is rotatably sleeved on the input shaft and used for outputting power outwards, and one end of the transmission assembly, which is far away from the input end, extends outwards from the shell; the other end of input shaft is located to the cover, coupling assembling and input shaft sliding connection to can slide along the axial direction of input shaft, wherein, coupling assembling accessible axial slip realizes being connected or disconnection with drive assembly, and when coupling assembling is connected with drive assembly, the input shaft can drive assembly and rotate.

According to the utility model discloses a first aspect technical scheme, transfer case includes casing, input shaft, drive assembly and coupling assembling. The shell serves as a base body of the transfer case and is used for bearing and supporting. The input shaft penetrates through the shell and is rotatably connected with the shell, two ends of the input shaft respectively extend out of two ends of the shell, and one end of the input shaft is an input end and is used for being connected with an engine so as to obtain power from the engine. The transmission assembly is rotatably sleeved on the input shaft and is used for being connected with an external load so as to output power outwards. The end of the transmission component far away from the input end extends outwards from the shell and is used for being connected with the connecting component. The other end of input shaft is located to coupling assembling cover, through setting up coupling assembling and input shaft sliding connection for coupling assembling can rotate along with the input shaft together, and can slide along the axial direction of input shaft, thereby realize through coupling assembling's axial slip and the transmission assembly between be connected or break off. Wherein, coupling assembling is located the casing outside, is convenient for operate and maintain from the outside, has simplified the inside structure of casing simultaneously. When the connecting component is connected with the transmission component, the input shaft can drive the transmission component to rotate together, so that the driving force of the engine is transmitted to an external load through the connecting component and the transmission component; when the connecting assembly is disconnected with the transmission assembly, the transmission connection between the engine and an external load is disconnected, so that a clutch effect is achieved, when construction is carried out under a low-temperature environment, the connection between the connecting assembly and the transmission assembly can be disconnected in advance before the engine is started, the engine is started in a no-load mode, the starting resistance of the engine can be reduced, the problem that the engine is difficult to start can be effectively solved, and the influence of weather conditions on construction operation of engineering machinery can be reduced. In addition, when the connecting assembly and the transmission assembly are in a connecting state, a matched hydraulic system or a driving mechanism is not needed to apply driving force to the connecting assembly so as to maintain the connecting state, the structure and the connecting relation are relatively simple, and the manufacturing cost is reduced; meanwhile, under normal weather conditions, the connection state of the connecting assembly and the transmission assembly can be used as a conventional state, disconnection or connection operation is not needed when the connecting assembly and the transmission assembly are started every time, abrasion can be effectively reduced, the service life is prolonged, and energy conservation and maintenance cost are facilitated.

It will be appreciated that, because the construction and operation of the various systems of a work machine are complex, numerous hydraulic systems, gear systems, etc. are typically required for connection and transmission. Under low temperature environment, hydraulic oil, gear oil viscosity rise, and the drive resistance of hydraulic pump increases, and the gear stirs the resistance of fluid and also increases thereupon, and the resistance that leads to when the engine loaded starts is showing the increase, very easily takes place the condition of unable normal start, and the transfer case in this scheme can make the engine realize no-load start, can effectively alleviate the unable problem of normal start of engine.

Additionally, the utility model provides an above-mentioned technical scheme transfer case can also have following additional technical characteristics:

in the above technical scheme, the coupling assembling includes: the synchronous shaft sleeve is sleeved on the input shaft, is connected with the input shaft in a sliding way and can rotate along with the input shaft; the adjusting mechanism is sleeved on the input shaft and is arranged corresponding to the synchronous shaft sleeve, and the adjusting mechanism can form axial force on the synchronous shaft sleeve to enable the synchronous shaft sleeve to axially slide.

In this technical scheme, coupling assembling includes synchronous axle sleeve and guiding mechanism. The synchronous shaft sleeve is sleeved on the input shaft and is in sliding connection with the input shaft, the synchronous shaft sleeve can synchronously rotate along with the input shaft and can simultaneously slide along the axial direction of the input shaft, and connection or disconnection between the synchronous shaft sleeve and the transmission assembly is realized through the axial sliding of the synchronous shaft sleeve. The adjusting mechanism is arranged corresponding to the synchronous shaft sleeve and sleeved on the input shaft, and the synchronous shaft sleeve axially slides through the axial force formed by the adjusting mechanism on the synchronous shaft sleeve. When the direction of the axial force is towards the transmission assembly, the synchronous shaft sleeve slides towards the direction close to the transmission assembly and is connected with the transmission assembly, so that the engine can normally output power to an external load; when the direction of the axial force is opposite to the transmission assembly, the synchronous shaft sleeve slides in the direction far away from the transmission assembly and is disconnected from the transmission assembly, so that the engine can be started in a no-load state, and the starting resistance of the engine is favorably reduced.

In the above technical solution, the adjusting mechanism includes: the reset spring is arranged at one end, close to the transmission assembly, of the synchronous shaft sleeve along the axial direction of the input shaft, one end of the reset spring is abutted against the synchronous shaft sleeve, and the other end of the reset spring is abutted against a spring limiting ring arranged along the radial direction of the input shaft; the spacer bush is sleeved on the input shaft and positioned at one end of the synchronous shaft sleeve, which is far away from the shell, and one end of the spacer bush, which is close to the synchronous shaft sleeve, is abutted against the synchronous shaft sleeve; the locking nut is in threaded connection with one end, far away from the input end, of the input shaft, one end of the locking nut abuts against the spacer bush, when the locking nut is screwed, the synchronous shaft sleeve moves towards the transmission assembly under the axial force action of the locking nut and the spacer bush and compresses the reset spring, the synchronous shaft sleeve is connected with the transmission assembly, and when the locking nut is unscrewed, the synchronous shaft sleeve moves towards the direction far away from the transmission assembly under the elastic force action of the reset spring and is disconnected with the transmission assembly.

In the technical scheme, the adjusting mechanism specifically comprises a return spring, a spacer bush and a locking nut. Reset spring locates the one end that synchronous axle sleeve is close to drive assembly along the axial direction of input shaft, one end and synchronous axle sleeve through setting up reset spring offset, the other end offsets with the spring spacing ring that sets up along the radial direction of input shaft, when in step the axle sleeve slides towards drive assembly, make reset spring form elastic deformation under the extrusion of synchronous axle sleeve, and produce the motion trend of reconversion, when in the gliding drive power of drive assembly of drive shaft sleeve orientation is less than reset spring's elasticity, make synchronous axle sleeve slide to the direction of keeping away from drive assembly under reset spring's elastic force, and with drive assembly disconnection. The spacer bush and the locking nut are sleeved on the input shaft and are sequentially arranged at one end, away from the shell, of the synchronous shaft sleeve along the axial direction. Two ends of the spacer bush respectively abut against the synchronous shaft sleeve and the locking nut and can move along the axial direction; the locking nut is in threaded connection with one end, far away from the input end, of the input shaft and can axially move on the input shaft by screwing or unscrewing. Specifically, when the locking nut is screwed, the locking nut extrudes the spacer bush, and applies axial force to the synchronous shaft sleeve through the spacer bush to push the synchronous shaft sleeve to slide towards the direction close to the transmission assembly, and meanwhile, the return spring is compressed to connect the synchronous shaft sleeve with the transmission assembly, so that the engine can normally output power to an external load; when the locking nut is loosened, the axial force generated by the locking nut on the synchronous shaft sleeve is gradually reduced, and when the axial force is smaller than the elastic force of the return spring, the synchronous shaft sleeve slides towards the direction far away from the transmission assembly under the elastic force of the return spring and is disconnected with the transmission assembly, so that the engine can be started in a no-load state, and the starting resistance of the engine is reduced. The number of the return springs can be one or more, the return springs can be one spring sleeved on the input shaft, or a plurality of springs arranged along the axial direction, and the springs are arranged at intervals in the input circumferential direction.

In the technical scheme, the locking nut is provided with a first pin hole along the radial direction; the input shaft is provided with a first pin hole along the axial direction, the input shaft is provided with a second pin hole along the axial direction, the adjusting mechanism further comprises a positioning pin, and when the synchronous shaft sleeve and the transmission assembly are in a connection state, the positioning pin penetrates through the first pin hole and the second pin hole to position the locking nut.

In the technical scheme, the adjusting mechanism further comprises a positioning pin, a first pin hole is formed in the locking nut in the opposite direction along the radial direction, a second pin hole is formed in the input shaft in the radial direction, and the position, corresponding to the locking nut, of the input shaft, when the synchronous shaft sleeve and the transmission assembly are in a connection state, the first pin hole can rotate to a position coaxial with the second pin hole and is transmitted into the first pin hole and the second pin hole through the positioning pin so as to position the locking nut, the locking nut is prevented from being loosened, and the connection stability between the synchronous shaft sleeve and the transmission assembly can be effectively improved. In addition, under normal climatic conditions, the connecting state between the synchronous shaft sleeve and the transmission assembly can be kept through the positioning pin, the structure is simple, the operation is easy, an external complex hydraulic system or driving equipment is not needed, the reconnection operation is not needed when the engine is started every time, the abrasion of the synchronous shaft sleeve and the transmission assembly can be reduced, and the service life can be prolonged.

In the above technical solution, the transmission assembly includes: the transmission gear is sleeved on the outer side of the input shaft along the radial direction and is used for being connected with a load, and one end, facing the adjusting mechanism, of the transmission gear extends outwards from the shell along the axial direction; the middle bearing is arranged between the input shaft and the transmission gear along the radial direction, wherein the transmission gear is rotatably connected with the input shaft through the middle bearing, and one end of the transmission gear, which extends out of the shell, can be connected with or disconnected from the synchronous shaft sleeve.

In this solution, the transmission assembly comprises a transmission gear and an intermediate bearing. The transmission gear is sleeved on the outer side of the input shaft along the radial direction, the middle bearing is sleeved on the input shaft, and the middle bearing is positioned between the input shaft and the transmission gear in the radial direction so that the transmission gear can be rotatably connected with the input shaft through the middle bearing. The transmission gear is used for being connected with a load, a section of the transmission gear extends out of the shell in the axial direction towards the adjusting mechanism and can be connected with or disconnected from the synchronous shaft sleeve, when the transmission gear is connected with the synchronous shaft sleeve, the transmission gear synchronously rotates under the driving of the input shaft, the output power of the engine is transmitted to the load, when the transmission gear is disconnected with the synchronous shaft sleeve, the disconnection between the engine and the load is realized, and the engine can be started without load in a low-temperature environment. The intermediate bearing may be a needle bearing or a sliding bearing.

In the technical scheme, a gear shaft sleeve is formed at one end of the transmission gear, which extends out of the shell, an internal spline is formed on the inner side surface of the gear shaft sleeve along the radial direction, and a radial gap is formed between the internal spline and the input shaft; and an external spline is formed on the outer side surface of one end of the synchronous shaft sleeve, which is close to the transmission gear, in the radial direction, and the external spline can be matched with the internal spline, wherein when the synchronous shaft sleeve moves towards the transmission gear, the synchronous shaft sleeve extends into the radial gap, and the input shaft is connected with the transmission gear through the matching of the external spline and the internal spline.

In the technical scheme, a gear shaft sleeve is formed at one end, facing the synchronous shaft sleeve, of the transmission gear, a radial gap is formed between the inner side surface of the gear shaft sleeve along the radial direction and the input shaft through arrangement, an internal spline is formed on the inner side surface of the gear shaft sleeve along the radial direction, an external spline is formed on the outer side surface of the synchronous shaft sleeve, which is close to one end of the transmission gear, along the radial direction, so that when the synchronous shaft sleeve slides towards the transmission gear, the synchronous shaft sleeve extends into the radial gap to form spline connection with the synchronous shaft sleeve, and the transmission gear and the input shaft synchronously rotate through the matching of the external spline and the internal spline, and further, the transmission connection.

In the above technical solution, the housing includes a first end cap and a second end cap disposed along an axial direction; wherein, the input of input shaft is stretched out outside the casing by first end cover, and input shaft passes through first bearing and first end cover rotatable coupling, and the one end that drive gear kept away from the input is stretched out outside the casing by the second end cover, and drive gear passes through second bearing and second end cover rotatable coupling.

In this technical scheme, the casing includes first end cover and second end cover, and first end cover sets up and mutual involution with the second end cover along axial direction to form and hold the chamber in casing inside. The input end of the input shaft extends out of the housing by the first end cap for connection with an engine to receive power from the engine. The input shaft passes through first bearing and first end cover rotatable coupling, and the one end that drive gear kept away from the input passes through second bearing and second end cover rotatable coupling to provide the support to input shaft and drive gear through first end cover and second end cover, prevent that input shaft and drive gear from taking place to rock at the rotation in-process, be favorable to improving transfer case's stability.

In above-mentioned technical scheme, be equipped with the lubricated oil duct on the drive gear, the one end intercommunication intermediate bearing of lubricated oil duct, the other end intercommunication second bearing and the second end cap between the axial clearance, wherein, the lubricating oil accessible lubricated oil duct flow direction intermediate bearing on the second end cap.

In this technical scheme, be equipped with the lubricated oil duct on the drive gear, one end through setting up lubricated oil duct communicates middle bearing, and the other end communicates the axial clearance between second bearing and the second end cover to make transfer case working process splash to the lubricated oil accessible lubricated oil duct flow direction middle bearing on the second end cover internal face, lubricate middle bearing, in order to reduce middle bearing's wearing and tearing, increase of service life.

In the above technical solution, the transfer case further includes: the first oil seal is sleeved on the input shaft and is positioned at one end of the first end cover, which is far away from the first bearing, so that the input shaft and the first end cover form sealing; the second oil seal is sleeved on the transmission gear and is positioned at one end of the second end cover far away from the second bearing so as to seal the transmission gear and the second end cover; and/or the sealing ring is sleeved on the input shaft and is positioned between the spring limiting ring and the intermediate bearing, one end of the sealing ring is abutted against the spring limiting ring, the other end of the sealing ring is abutted against the radial protrusion on the input shaft, the radial outer side surface and the radial inner side surface of the sealing ring are respectively provided with an annular groove, and an annular sealing ring is arranged in the annular groove so that the transmission gear and the input shaft are sealed.

In this technical scheme, be equipped with first oil blanket through the one end of keeping away from first bearing at first end cover, and on first oil blanket cover was located the input shaft to form sealedly between messenger input shaft and the first end cover through first oil blanket, prevent the outside seepage in the gap that lubricating oil liquid passes through between input shaft and the first end cover. Similarly, a second oil seal is arranged at one end, far away from the second bearing, of the second end cover, the second oil seal is sleeved on the transmission gear, so that sealing is formed between the transmission gear and the second end cover through the second oil seal, and lubricating oil is prevented from leaking outwards through a gap between the transmission gear and the second end cover. Through setting up first oil blanket and second oil blanket, can effectively reduce the loss of the lubricated fluid in the casing, be favorable to reducing the maintenance cost of transfer case.

The sealing ring is arranged between the spring limiting ring and the middle bearing, and the sealing ring is sleeved on the input shaft and used for sealing a radial gap between the gear shaft sleeve and the input shaft. Specifically, the sealing rings are respectively provided with an annular groove on the radial outer side face and the radial inner side face, an annular sealing ring is arranged in the annular groove, the outer edge of the annular sealing ring positioned on the radial outer side is abutted against the inner side face of the gear shaft sleeve, the inner edge of the annular sealing ring positioned on the radial inner side is abutted against the outer side face of the input shaft, and a radial gap between the gear shaft sleeve and the input shaft is sealed through the annular sealing ring.

The utility model discloses an among the second aspect technical scheme provide an engineering machine tool, include: a body; the engine is arranged on the machine body; the transfer case of any one of the first technical scheme is arranged on the engine body, and an input shaft of the transfer case is in transmission connection with the engine; and the working system is in transmission connection with the transmission assembly of the transfer case, wherein the engineering machinery is a paver or a grader.

According to the utility model discloses engineering machine in the second aspect technical scheme, including organism, engine, the transfer case and at least one operating system of any one of the above-mentioned first aspect technical scheme. The engine and the transfer case are arranged on the engine body, an output shaft of the engine is in transmission connection with an input shaft of the transfer case, a transmission assembly of the transfer case is in transmission connection with at least one operation system, so that when the input shaft of the transfer case is in connection with the transmission assembly, the engine is in transmission connection with the at least one operation system, and output power of the engine is transmitted to the operation system through the transfer case to drive the operation system to operate. When the input shaft of the transfer case is disconnected from the transmission assembly, the engine is disconnected from the operating system. When the engine of the engineering machine is difficult to start in a low-temperature environment, the transfer case can be in a disconnected state by disconnecting the input shaft of the transfer case from the transmission assembly, so that the load of the engine during starting is reduced, and the starting difficulty of the engine is reduced. After the engine is started and the temperature of the engine rises to the normal working temperature, the transfer case is switched to the connection state, so that the engine normally outputs power to the operation system, paving or flat ground operation is realized, and the problem that the engine cannot be normally started when the engineering machinery is constructed in a low-temperature environment is solved. The engineering machine in this scheme should still have all the beneficial effects of the transfer case of any one of the above-mentioned first aspect technical solutions, and no further description is provided herein.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 illustrates a partial cross-sectional view of a transfer case according to one embodiment of the present invention;

FIG. 2 illustrates a partial cross-sectional view of a transfer case according to one embodiment of the present invention;

FIG. 3 illustrates a partial cross-sectional view of a transfer case according to one embodiment of the present invention;

FIG. 4 illustrates a partial cross-sectional view of a transfer case according to one embodiment of the present invention;

FIG. 5 illustrates a partial cross-sectional view of a transfer case according to one embodiment of the present invention;

FIG. 6 shows an enlarged view of portion A of FIG. 5;

FIG. 7 illustrates a partial cross-sectional view of a transfer case according to one embodiment of the present invention;

fig. 8 shows an enlarged view of portion B of fig. 7;

FIG. 9 illustrates a partial cross-sectional view of a transfer case according to one embodiment of the present invention.

Wherein, the correspondence between the reference numbers and the components in fig. 1 to 9 is as follows:

the oil seal structure comprises a shell 1, a first end cover 11, a second end cover 12, a lubricating oil channel 121, an input shaft 2, an input end 21, a transmission assembly 3, a transmission gear 31, a gear shaft sleeve 311, an internal spline 312, a middle bearing 32, a connection assembly 4, a synchronous shaft sleeve 41, an external spline 412, an adjusting mechanism 42, a return spring 421, a spring limiting ring 422, a spacer 423, a locking nut 424, a positioning pin 425, a first bearing 51, a second bearing 52, a first oil seal 61, a second oil seal 62, a sealing ring 63 and an annular sealing ring 64.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

Transfer cases and work machines of some embodiments of the present invention are described below with reference to fig. 1-9.

Example one

The present embodiment provides a transfer case, as shown in fig. 1, including a housing 1, an input shaft 2, a transmission assembly 3, and a coupling assembly 4. The housing 1 serves as a base for the transfer case, providing support and mounting space for other components within the transfer case. Wherein, the housing 1 stores lubricating oil therein to lubricate components inside the housing 1. The input shaft 2 penetrates through the shell 1 and is rotatably connected with the shell 1 and can rotate relative to the shell 1; one end of the input shaft 2 is an input end 21, extends outwards from one end of the shell 1, and is used for being in transmission connection with an engine so as to serve as the input end 21 for receiving power from the engine; the other end of the input shaft 2 also projects outwardly from the housing 1. The transmission component 3 is rotatably sleeved on the input shaft 2, can independently rotate relative to the input shaft 2 and can also rotate along with the input shaft 2; the transmission assembly 3 can be in transmission connection with an external load to output power outwards. The end of the transmission assembly 3 remote from the input 21 projects outwardly from the housing 1 for connection to the connection assembly 4. The connecting component 4 is positioned outside the shell 1 and sleeved at the other end of the input shaft 2; the connecting assembly 4 is slidably connected to the input shaft 2, and the connecting assembly 4 is slidable in an axial direction of the input shaft 2 and rotates together with the input shaft 2 when the input shaft 2 rotates. The connecting component 4 can be connected or disconnected with the transmission component 3 through axial sliding, wherein when the connecting component 4 is connected with the transmission component 3, the transmission component 3 can be driven by the input shaft 2 and the connecting component 4 to rotate, and then power is output to an external load in transmission connection with the transmission component 3, so that power transmission between an engine and the external load is realized. When the engineering mechanical equipment provided with the transfer case in the embodiment encounters low-temperature climate to cause difficulty in starting the engine, the connecting assembly 4 can be disconnected from the transmission assembly 3 through axial sliding of the connecting assembly 4, a clutch effect is achieved, the engine can be started in a no-load state, resistance when the engine is started is reduced, when the engine enters a stable state and the temperature of the engine rises to a normal working temperature, connection is achieved through the axial sliding of the connecting assembly 4 and the transmission assembly 3, and therefore power of the engine can be transmitted to an external load normally through the transfer case.

Example two

The present embodiment provides a transfer case, as shown in fig. 2, including a housing 1, an input shaft 2, a transmission assembly 3, and a coupling assembly 4.

The housing 1 serves as a base for the transfer case, providing support and mounting space for the internal components of the transfer case. Wherein, the housing 1 stores lubricating oil therein to lubricate components inside the housing 1. The input shaft 2 penetrates through the shell 1 and is rotatably connected with the shell 1 and can rotate relative to the shell 1; one end of the input shaft 2 is an input end 21, extends outwards from one end of the shell 1, and is used for being in transmission connection with an engine so as to serve as the input end 21 for receiving power from the engine; the other end of the input shaft 2 also projects outwardly from the housing 1. The transmission component 3 is rotatably sleeved on the input shaft 2, can independently rotate relative to the input shaft 2 and can also rotate along with the input shaft 2; the transmission assembly 3 can be in transmission connection with an external load to output power outwards. The end of the transmission assembly 3 remote from the input 21 projects outwardly from the housing 1 for connection to the connection assembly 4. The connecting component 4 is connected with the input shaft 2 in a sliding mode, the connecting component 4 can slide along the axial direction of the input shaft 2 and rotate along with the input shaft 2 when the input shaft 2 rotates, and therefore the connecting component 4 can be connected with or disconnected from the transmission component 3 through axial sliding.

Specifically, as shown in fig. 2, the connecting assembly 4 includes a synchronizing sleeve 41 and an adjusting mechanism 42. The synchronizing sleeve 41 is sleeved on the input shaft 2 and slidably connected to the input shaft 2, and the synchronizing sleeve 41 can slide along the axial direction of the input shaft 2 and synchronously rotate along with the input shaft 2 when the input shaft 2 rotates. The adjusting mechanism 42 is used for operating and adjusting the axial sliding of the synchronizing sleeve 41, and specifically, the adjusting mechanism 42 specifically includes a return spring 421, a spring retainer 422, a spacer 423 and a lock nut 424. The spacer 423 is sleeved on the input shaft 2 and located at one end of the synchronizing shaft sleeve 41 away from the housing 1. The lock nut 424 is screwed to an end of the input shaft 2 remote from the input end 21 and can be screwed or unscrewed along the input shaft 2. Both ends of the spacer 423 are respectively abutted against the synchronizing sleeve 41 and the lock nut 424 for transmitting the axial force of the lock nut 424. The return spring 421 is disposed at one end of the synchronizing sleeve 41 close to the transmission assembly 3 along the axial direction of the input shaft 2, and is sleeved on the outer side of the input shaft 2 along the radial direction. The spring retainer 422 is sleeved on the input shaft 2 and is fixedly connected with the input shaft 2, and two ends of the return spring 421 respectively abut against the spring retainer 422 and the synchronizing shaft sleeve 41.

When the locking nut 424 is screwed, the locking nut 424 presses the spacer 423, and applies an axial force to the synchronizing shaft sleeve 41 through the spacer 423 to push the synchronizing shaft sleeve 41 to slide in a direction close to the transmission assembly 3, so that the synchronizing shaft sleeve 41 is connected with the transmission assembly 3, as shown in the state of fig. 2, at this time, the transmission assembly 3 synchronously rotates with the input shaft 2; meanwhile, the synchronous bushing 41 compresses the return spring 421, so that the return spring 421 is elastically deformed and has a tendency of returning to its original shape. When the locking nut 424 is loosened, the axial force applied by the locking nut 424 to the synchronizing shaft sleeve 41 is gradually reduced, and when the axial force is smaller than the elastic force of the return spring 421, the synchronizing shaft sleeve 41 slides in the direction away from the transmission assembly 3 under the elastic force of the return spring 421, so that the connection assembly 4 and the transmission assembly 3 are disconnected, as shown in fig. 3. When the engineering mechanical equipment provided with the transfer case in the embodiment encounters low temperature to cause difficulty in starting the engine, the locking nut 424 is operated to unscrew so that the connecting assembly 4 slides axially, the connecting assembly 4 is disconnected from the transmission assembly 3, a clutch effect is achieved, the engine is started in a no-load state, resistance in starting the engine is reduced, when the engine enters a stable state and the temperature of the engine rises to a normal working temperature, the locking nut 424 is operated to screw so that the connecting assembly 4 is connected with the transmission assembly 3, and therefore power of the engine can be transmitted to an external load normally through the transfer case.

EXAMPLE III

The embodiment provides a transfer case, and as shown in fig. 4, a further improvement is made on the basis of the second embodiment. The adjustment mechanism 42 further includes an alignment pin 425; the locking nut 424 is provided with a first pin hole extending in the radial direction, and the input shaft 2 is provided with a second pin hole extending in the radial direction at a position corresponding to the locking nut 424. When the synchronizing sleeve 41 and the transmission assembly 3 are in a connected state, the first pin hole and the second pin hole can be located at the same axial position by adjusting the locking nut 424, as shown in the state shown in fig. 4, at this time, the positioning pin 425 can pass through the first pin hole and the second pin hole, so that the locking nut 424 cannot be rotated, thereby positioning the locking nut 424, preventing the locking nut 424 from loosening, and effectively improving the connection stability between the synchronizing sleeve 41 and the transmission assembly 3.

Example four

The present embodiment provides a transfer case, as shown in fig. 5, including a housing 1, an input shaft 2, a transmission assembly 3, and a coupling assembly 4.

The housing 1 serves as a base for the transfer case, providing support and mounting space for other components within the transfer case. The input shaft 2 is connected to the housing 1 and is rotatably connected to the housing 1 so as to be rotatable relative to the housing 1. The input shaft 2 penetrates through the shell 1 and is rotatably connected with the shell 1 and can rotate relative to the shell 1; one end of the input shaft 2 is an input end 21, extends outwards from one end of the shell 1, and is used for being in transmission connection with an engine so as to serve as the input end 21 for receiving power from the engine; the other end of the input shaft 2 also projects outwardly from the housing 1.

As shown in fig. 5, the transmission assembly 3 includes a transmission gear 31 and an intermediate bearing 32. The transmission gear 31 is sleeved on the radial outer side of the input shaft 2, the intermediate bearing 32 is sleeved on the input shaft 2 and is positioned between the input shaft 2 and the transmission gear 31 in the radial direction, so that the transmission gear 31 is rotatably connected with the input shaft 2 through the intermediate bearing 32, that is, the transmission gear 31 can rotate independently relative to the input shaft 2 or synchronously rotate along with the input shaft 2. The transmission gear 31 may be drivingly connected with an external load to output power to the outside. The intermediate bearing 32 may be a needle bearing or a sliding bearing.

As shown in fig. 5, the connecting assembly 4 includes a synchronizing sleeve 41 and an adjusting mechanism 42. The synchronizing sleeve 41 is sleeved on the input shaft 2 and slidably connected to the input shaft 2, and the synchronizing sleeve 41 can slide along the axial direction of the input shaft 2 and synchronously rotate along with the input shaft 2 when the input shaft 2 rotates. The adjusting mechanism 42 is used for operating and adjusting the axial sliding of the synchronizing sleeve 41, and specifically, the adjusting mechanism 42 specifically includes a return spring 421, a spring retainer 422, a spacer 423 and a lock nut 424. The spacer 423 is sleeved on the input shaft 2 and located at one end of the synchronizing shaft sleeve 41 away from the housing 1. The lock nut 424 is screwed to an end of the input shaft 2 remote from the input end 21 and can be screwed or unscrewed along the input shaft 2. Both ends of the spacer 423 are respectively abutted against the synchronizing sleeve 41 and the lock nut 424 for transmitting the axial force of the lock nut 424. The return spring 421 is disposed at one end of the synchronizing sleeve 41 close to the transmission assembly 3 along the axial direction of the input shaft 2, and is sleeved on the outer side of the input shaft 2 along the radial direction. The spring retainer 422 is sleeved on the input shaft 2 and is fixedly connected with the input shaft 2, and two ends of the return spring 421 respectively abut against the spring retainer 422 and the synchronizing shaft sleeve 41.

When the locking nut 424 is screwed, the locking nut 424 presses the spacer 423, and applies an axial force to the synchronizing shaft sleeve 41 through the spacer 423 to push the synchronizing shaft sleeve 41 to slide in a direction close to the transmission assembly 3, so that the synchronizing shaft sleeve 41 is connected with the transmission assembly 3, as shown in the state of fig. 5, at this time, the transmission assembly 3 synchronously rotates with the input shaft 2; meanwhile, the synchronous bushing 41 compresses the return spring 421, so that the return spring 421 is elastically deformed and has a tendency of returning to its original shape. When the locking nut 424 is loosened, the axial force applied by the locking nut 424 to the synchronizing shaft sleeve 41 is gradually reduced, and when the axial force is smaller than the elastic force of the return spring 421, the synchronizing shaft sleeve 41 slides in the direction away from the transmission assembly 3 under the elastic force of the return spring 421, so that the connection between the connection assembly 4 and the transmission assembly 3 is disconnected. When the engineering mechanical equipment provided with the transfer case in the embodiment encounters low temperature to cause difficulty in starting the engine, the locking nut 424 is operated to unscrew so that the connecting assembly 4 slides axially, the connecting assembly 4 is disconnected from the transmission assembly 3, a clutch effect is achieved, the engine is started in a no-load state, resistance in starting the engine is reduced, when the engine enters a stable state and the temperature of the engine rises to a normal working temperature, the locking nut 424 is operated to screw so that the connecting assembly 4 is connected with the transmission assembly 3, and therefore power of the engine can be transmitted to an external load normally through the transfer case.

Further, as shown in fig. 6, the transmission gear 31 extends in the axial direction toward one end of the synchronizing sleeve 41 and forms a gear sleeve 311, a radial gap is formed between the inner side surface of the gear sleeve 311 in the radial direction and the input shaft 2, and an internal spline 312 is formed on the inner side surface of the gear sleeve 311 in the radial direction; an outer spline 412 which can be matched with the inner spline 312 is formed on the outer side surface of one end of the synchronizing sleeve 41 close to the transmission gear 31 in the radial direction. When the synchronizing shaft sleeve 41 slides towards the transmission gear 31, the part of the synchronizing shaft sleeve 41 provided with the external spline 412 extends into the radial gap between the gear shaft sleeve 311 and the input shaft 2, and the transmission connection between the input shaft 2 and the transmission gear 31 is realized through the matching between the external spline 412 and the internal spline 312, so that the transmission gear 31 synchronously rotates under the driving of the input and synchronizing shaft sleeves 41.

EXAMPLE five

The transfer case provided in the embodiment is further improved on the basis of the fourth embodiment. As shown in fig. 7, the housing 1 includes a first end cap 11 and a second end cap 12, the first end cap 11 and the second end cap 12 are disposed along an axial direction, and are connected by bolts and are mutually involuted to form an accommodating cavity that can accommodate the input shaft 2, the connecting assembly 4 and the transmission assembly 3. Wherein the receiving cavity is stored with lubricating oil for lubricating the components inside the housing 1.

The first end cover 11 is provided with a through hole, and the input end 21 of the input shaft 2 passes through the first end cover 11 through the through hole and extends out of the shell 1; the first end cover 11 is provided with a first bearing 51 at one end of the through hole facing the inside of the housing 1, and the input shaft 2 is rotatably connected with the first end cover 11 through the first bearing 51. The second end cap 12 is also provided with a through hole, through which a gear sleeve 311 of the transmission gear 31 passes and extends outward from the second end cap 12, and the gear sleeve 311 is rotatably coupled to the second end cap 12 through a second bearing 52.

Further, a lubricating oil passage 121 is provided on the transmission gear 31 for guiding lubricating oil to lubricate the intermediate bearing 32. Specifically, the lubricating oil gallery 121 is located in a side wall of the gear boss 311 of the transmission gear 31 at an inclined angle to the axial direction; one end of the lubricating oil passage 121 communicates with the intermediate bearing 32, and the other end of the lubricating oil passage 121 communicates with the axial gap between the second bearing 52 and the second end cap 12, so that the lubricating oil splashed onto the inner wall surface of the second end cap 12 can flow toward the intermediate bearing 32 through the lubricating oil passage 121 to lubricate the intermediate bearing 32.

EXAMPLE six

The transfer case provided in the embodiment is further improved on the basis of the fifth embodiment. As shown in fig. 7, a first oil seal 61 is disposed at an end of the first end cap 11 away from the first bearing 51, and the first oil seal 61 is sleeved on the input shaft 2, so that a seal is formed between the input shaft 2 and the first end cap 11 through the first oil seal 61, and the lubricating oil is prevented from leaking outwards through a gap between the input shaft 2 and the first end cap 11. A second oil seal 62 is disposed at an end of the second end cap 12 away from the second bearing 52, and the second oil seal 62 is sleeved on the transmission gear 31, so that a seal is formed between the transmission gear 31 and the second end cap 12 through the second oil seal 62, and the lubricating oil is prevented from leaking outwards through a gap between the transmission gear 31 and the second end cap 12.

Further, as shown in fig. 8, a sealing ring 63 is disposed between the spring retaining ring 422 and the middle bearing 32, and the sealing ring 63 is sleeved on the input shaft 2. Specifically, annular grooves are formed in the radial outer side face and the radial inner side face of the sealing ring 63 respectively, annular sealing rings 64 are arranged in the annular grooves, the outer edges of the annular sealing rings 64 located on the radial outer side abut against the inner side face of the gear shaft sleeve 311, the inner edges of the annular sealing rings 64 located on the radial inner side abut against the outer side face of the input shaft 2, sealing is formed on the radial gap between the gear shaft sleeve 311 and the input shaft 2 through the annular sealing rings 64, and lubricating oil in the shell 1 is prevented from leaking outwards through the radial gap between the gear shaft sleeve 311 and the input shaft 2.

EXAMPLE seven

The embodiment provides a transfer case which comprises a shell 1, an input shaft 2, a transmission assembly 3 and a connecting assembly 4.

As shown in fig. 9, the housing 1 serves as a base for the transfer case, providing support and mounting space for other components within the transfer case. The housing 1 includes a first end cap 11 and a second end cap 12, the first end cap 11 and the second end cap 12 are arranged along the axial direction, and are connected by bolts and mutually involuted to form a containing cavity capable of containing the input shaft 2, the connecting assembly 4 and the transmission assembly 3. Wherein the receiving cavity is stored with lubricating oil for lubricating the components inside the housing 1. The first end cover 11 is provided with a through hole, and the input end 21 of the input shaft 2 passes through the first end cover 11 through the through hole and extends out of the shell 1; the first end cover 11 is provided with a first bearing 51 at one end of the through hole facing the inside of the housing 1, and the input shaft 2 is rotatably connected with the first end cover 11 through the first bearing 51. The second end cap 12 is also provided with a through hole through which the gear bush 311 of the transmission gear 31 and the other end of the input shaft 2 pass and protrude outward from the second end cap 12, and the gear bush 311 is rotatably coupled to the second end cap 12 via a second bearing 52.

As shown in fig. 9, the transmission assembly 3 includes a transmission gear 31 and an intermediate bearing 32. The transmission gear 31 is sleeved on the radial outer side of the input shaft 2, the intermediate bearing 32 is sleeved on the input shaft 2 and is positioned between the input shaft 2 and the transmission gear 31 in the radial direction, so that the transmission gear 31 is rotatably connected with the input shaft 2 through the intermediate bearing 32, that is, the transmission gear 31 can rotate independently relative to the input shaft 2 or synchronously rotate along with the input shaft 2. The transmission gear 31 extends in the axial direction toward one end of the synchronizing sleeve 41 and forms a gear sleeve 311, and the gear sleeve 311 is formed with an internal spline 312 on the inner side surface in the radial direction. The transmission gear 31 may be drivingly connected with an external load to output power to the outside. The intermediate bearing 32 may be a needle bearing or a sliding bearing. The transmission gear 31 is provided with a lubricating oil passage 121 for guiding lubricating oil to lubricate the intermediate bearing 32. Specifically, the lubricating oil gallery 121 is located in a side wall of the gear boss 311 of the transmission gear 31 at an inclined angle to the axial direction; one end of the lubricating oil passage 121 communicates with the intermediate bearing 32, and the other end of the lubricating oil passage 121 communicates with the axial gap between the second bearing 52 and the second end cap 12, so that the lubricating oil splashed onto the inner wall surface of the second end cap 12 can flow toward the intermediate bearing 32 through the lubricating oil passage 121 to lubricate the intermediate bearing 32.

As shown in fig. 9, the connecting assembly 4 includes a synchronizing sleeve 41 and an adjusting mechanism 42. The synchronizing sleeve 41 is sleeved on the input shaft 2 and slidably connected to the input shaft 2, and the synchronizing sleeve 41 can slide along the axial direction of the input shaft 2 and synchronously rotate along with the input shaft 2 when the input shaft 2 rotates. The adjusting mechanism 42 is used for operating and adjusting the axial sliding of the synchronizing sleeve 41, and specifically, the adjusting mechanism 42 specifically includes a return spring 421, a spring retainer 422, a spacer 423 and a lock nut 424. The spacer 423 is sleeved on the input shaft 2 and located at one end of the synchronizing shaft sleeve 41 away from the housing 1. The lock nut 424 is screwed to an end of the input shaft 2 remote from the input end 21 and can be screwed or unscrewed along the input shaft 2. Both ends of the spacer 423 are respectively abutted against the synchronizing sleeve 41 and the lock nut 424 for transmitting the axial force of the lock nut 424. The return spring 421 is disposed at one end of the synchronizing sleeve 41 close to the transmission assembly 3 along the axial direction of the input shaft 2, and is sleeved on the outer side of the input shaft 2 along the radial direction. The spring retainer 422 is sleeved on the input shaft 2 and is fixedly connected with the input shaft 2, and two ends of the return spring 421 respectively abut against the spring retainer 422 and the synchronizing shaft sleeve 41.

When the locking nut 424 is screwed, the locking nut 424 presses the spacer 423, and applies an axial force to the synchronizing shaft sleeve 41 through the spacer 423 to push the synchronizing shaft sleeve 41 to slide in a direction close to the transmission assembly 3, so that the synchronizing shaft sleeve 41 is connected with the transmission assembly 3, as shown in the state of fig. 9, at this time, the transmission assembly 3 synchronously rotates with the input shaft 2; meanwhile, the synchronous bushing 41 compresses the return spring 421, so that the return spring 421 is elastically deformed and has a tendency of returning to its original shape. When the locking nut 424 is loosened, the axial force applied by the locking nut 424 to the synchronizing shaft sleeve 41 is gradually reduced, and when the axial force is smaller than the elastic force of the return spring 421, the synchronizing shaft sleeve 41 slides in the direction away from the transmission assembly 3 under the elastic force of the return spring 421, so that the connection between the connection assembly 4 and the transmission assembly 3 is disconnected. When the engineering mechanical equipment provided with the transfer case in the embodiment encounters low temperature to cause difficulty in starting the engine, the locking nut 424 is operated to unscrew so that the connecting assembly 4 slides axially, the connecting assembly 4 is disconnected from the transmission assembly 3, a clutch effect is achieved, the engine is started in a no-load state, resistance in starting the engine is reduced, when the engine enters a stable state and the temperature of the engine rises to a normal working temperature, the locking nut 424 is operated to screw so that the connecting assembly 4 is connected with the transmission assembly 3, and therefore power of the engine can be transmitted to an external load normally through the transfer case.

Wherein, the one end of keeping away from first bearing 51 at first end cover 11 is equipped with first oil blanket 61, and first oil blanket 61 cover is located on the input shaft 2 to form sealedly between input shaft 2 and the first end cover 11 through first oil blanket 61, prevent that lubricated fluid from outwards leaking through the gap between input shaft 2 and the first end cover 11. A second oil seal 62 is disposed at an end of the second end cap 12 away from the second bearing 52, and the second oil seal 62 is sleeved on the transmission gear 31, so that a seal is formed between the transmission gear 31 and the second end cap 12 through the second oil seal 62, and the lubricating oil is prevented from leaking outwards through a gap between the transmission gear 31 and the second end cap 12. A sealing ring 63 is further disposed between the spring retaining ring 422 and the intermediate bearing 32, and the sealing ring 63 is sleeved on the input shaft 2. Annular grooves are formed in the radial outer side face and the radial inner side face of the sealing ring 63 respectively, annular sealing rings 64 are arranged in the annular grooves, the outer edges of the annular sealing rings 64 located on the radial outer side abut against the inner side face of the gear shaft sleeve 311, the inner edges of the annular sealing rings 64 located on the radial inner side abut against the outer side face of the input shaft 2, sealing is formed on the radial gap between the gear shaft sleeve 311 and the input shaft 2 through the annular sealing rings 64, and lubricating oil in the shell 1 is prevented from leaking outwards through the radial gap between the gear shaft sleeve 311 and the input shaft 2.

Example eight

The embodiment provides an engineering machine, including: comprises a machine body, an engine, a transfer case in any one of the embodiments and at least one working system. The machine body is used for bearing various parts and systems of the engineering machine. The engine and the transfer case are arranged on the engine body to realize assembly and fixation through the engine body. The operation system is used for construction operation. Wherein, the output shaft of the engine is in transmission connection with the input shaft 2 of the transfer case, and the transmission component 3 of the transfer case is in transmission connection with at least one operation system. When the input shaft 2 of the transfer case is connected with the transmission assembly 3, the engine is in transmission connection with at least one working system, so that the output power of the engine is transmitted to the working system through the transfer case to drive the working system to run. When the input shaft 2 of the transfer case is disconnected from the transmission assembly 3, the engine is disconnected from the work system. The operation system includes, but is not limited to, a traveling system, a paving system, a milling system, a grading system, and a vibrating system.

When the engine of the engineering machinery is difficult to start in a low-temperature environment, the transfer case can be in a disconnected state by disconnecting the input shaft of the transfer case from the transmission assembly, so that the load of the engine during starting is reduced, and the starting difficulty of the engine is reduced. After the engine is started and the temperature of the engine rises to the normal working temperature, the transfer case is switched to the connection state, so that the engine normally outputs power to the operation system, normal construction operation is realized, and the problem that the engine cannot be normally started when the engineering machinery is constructed in a low-temperature environment is solved. The engineering machine in this embodiment should also have all the advantages of the transfer case in any of the above embodiments, and details are not described here.

The work machine may be a paver or a grader, among others.

Above combine the figure to describe in detail the technical scheme of the utility model, can realize no load and start when the engineering machine tool who is equipped with the transfer case uses under low temperature environment, effectively reduced the starting resistance of engine, simplified the inner structure and the connected mode of transfer case simultaneously, it is easy and simple to handle, reduced the routine maintenance degree of difficulty, be favorable to reducing use cost.

In the present application, the terms "first", "second", "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or unit indicated must have a specific direction, be constructed and operated in a specific orientation, and therefore, should not be construed as limiting the present invention.

In the description of the present specification, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means 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 invention. 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.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A transfer case, comprising:

a housing (1);

the input shaft (2) penetrates through the shell (1) and is rotatably connected with the shell (1), two ends of the input shaft (2) extend out of the shell (1), and one end of the input shaft (2) is an input end (21) and is used for being connected with an engine;

the transmission component (3) is rotatably sleeved on the input shaft (2) and used for outputting power outwards, and one end, far away from the input end (21), of the transmission component (3) extends outwards from the shell (1);

the connecting component (4) is sleeved at the other end of the input shaft (2), the connecting component (4) is connected with the input shaft (2) in a sliding manner and can slide along the axial direction of the input shaft (2),

wherein, coupling assembling (4) accessible axial slip with drive assembly (3) realize connecting or breaking off, and be in coupling assembling (4) with when drive assembly (3) are connected, input shaft (2) can drive assembly (3) rotate.

2. The transfer case of claim 1, wherein the connection assembly (4) comprises:

the synchronous shaft sleeve (41) is sleeved on the input shaft (2), and the synchronous shaft sleeve (41) is connected with the input shaft (2) in a sliding mode and can rotate along with the input shaft (2);

the adjusting mechanism (42) is sleeved on the input shaft (2) and is arranged corresponding to the synchronous shaft sleeve (41), and the adjusting mechanism (42) can form axial force on the synchronous shaft sleeve (41) to enable the synchronous shaft sleeve (41) to axially slide.

3. The transfer case of claim 2, wherein the adjustment mechanism (42) includes:

the reset spring (421) is arranged at one end, close to the transmission assembly (3), of the synchronous shaft sleeve (41) along the axial direction of the input shaft (2), one end of the reset spring (421) abuts against the synchronous shaft sleeve (41), and the other end of the reset spring (421) abuts against a spring limiting ring (422) arranged along the radial direction of the input shaft (2);

the spacer sleeve (423) is sleeved on the input shaft (2) and is positioned at one end, far away from the shell (1), of the synchronous shaft sleeve (41), and one end, close to the synchronous shaft sleeve (41), of the spacer sleeve (423) is abutted against the synchronous shaft sleeve (41);

a locking nut (424) which is in threaded connection with one end of the input shaft (2) far away from the input end (21), one end of the locking nut (424) is abutted against the spacer (423),

when the locking nut (424) is screwed, the synchronous shaft sleeve (41) moves towards the transmission assembly (3) and compresses the return spring (421) under the action of axial force of the locking nut (424) and the spacer bush (423), the synchronous shaft sleeve (41) is connected with the transmission assembly (3), and when the locking nut (424) is unscrewed, the synchronous shaft sleeve (41) moves away from the transmission assembly (3) under the action of elastic force of the return spring (421) and is disconnected with the transmission assembly (3).

4. The transfer case of claim 3,

a first pin hole is formed in the locking nut (424) along the radial direction;

a second pin hole is arranged at the position of the input shaft (2) corresponding to the locking nut (424) along the radial direction,

the adjusting mechanism (42) further comprises a positioning pin (425), and when the synchronous shaft sleeve (41) and the transmission assembly (3) are in a connection state, the positioning pin (425) penetrates into the first pin hole and the second pin hole to position the locking nut (424).

5. The transfer case of claim 3, wherein the transmission assembly (3) comprises:

the transmission gear (31) is sleeved on the outer side of the input shaft (2) in the radial direction and is used for being connected with a load, and one end, facing the adjusting mechanism (42), of the transmission gear (31) extends outwards from the shell (1) in the axial direction;

an intermediate bearing (32) disposed between the input shaft (2) and the transmission gear (31) in a radial direction,

the transmission gear (31) is rotatably connected with the input shaft (2) through the intermediate bearing (32), and one end, extending out of the shell (1), of the transmission gear (31) can be connected with or disconnected from the synchronous shaft sleeve (41).

6. The transfer case of claim 5,

a gear shaft sleeve (311) is formed at one end, extending out of the shell (1), of the transmission gear (31), an internal spline (312) is formed on the inner side surface of the gear shaft sleeve (311) in the radial direction, and a radial gap is formed between the gear shaft sleeve and the input shaft (2);

an external spline (412) is formed on the outer side surface of one end, close to the transmission gear (31), of the synchronizing shaft sleeve (41) along the radial direction, the external spline (412) can be matched with the internal spline (312),

when the synchronous shaft sleeve (41) moves towards the transmission gear (31), the synchronous shaft sleeve (41) extends into the radial gap, and the input shaft (2) is connected with the transmission gear (31) through the matching of the external spline (412) and the internal spline (312).

7. The transfer case of claim 5,

the housing (1) comprises a first end cover (11) and a second end cover (12) which are arranged along the axial direction;

the input end (21) of the input shaft (2) extends out of the shell (1) through the first end cover (11), the input shaft (2) is rotatably connected with the first end cover (11) through a first bearing (51), one end, far away from the input end (21), of the transmission gear (31) extends out of the shell (1) through the second end cover (12), and the transmission gear (31) is rotatably connected with the second end cover (12) through a second bearing (52).

8. The transfer case of claim 7,

a lubricating oil channel (121) is arranged on the transmission gear (31), one end of the lubricating oil channel (121) is communicated with the middle bearing (32), the other end of the lubricating oil channel is communicated with an axial gap between the second bearing (52) and the second end cover (12),

wherein the lubricating oil on the second end cover (12) can flow to the middle bearing (32) through the lubricating oil channel (121).

9. The transfer case of claim 8, further comprising:

the first oil seal (61) is sleeved on the input shaft (2) and is positioned at one end, far away from the first bearing (51), of the first end cover (11), so that sealing is formed between the input shaft (2) and the first end cover (11);

the second oil seal (62) is sleeved on the transmission gear (31) and is positioned at one end, far away from the second bearing (52), of the second end cover (12), so that sealing is formed between the transmission gear (31) and the second end cover (12); and/or

The sealing ring (63) is sleeved on the input shaft (2) and located between the spring limiting ring (422) and the intermediate bearing (32), one end of the sealing ring (63) is abutted to the spring limiting ring (422), the other end of the sealing ring is abutted to the radial protrusion on the input shaft (2), annular grooves are formed in the radial outer side face and the radial inner side face of the sealing ring (63), and annular sealing rings (64) are arranged in the annular grooves, so that the transmission gear (31) and the input shaft (2) are sealed.

10. A work machine, comprising:

a body;

the engine is arranged on the machine body;

the transfer case of any one of claims 1 to 9, being disposed on the engine body, the input shaft (2) of the transfer case being drivingly connected to the output shaft of the engine;

at least one work system in driving connection with a transmission assembly (3) of the transfer case,

wherein the engineering machinery is a paver or a grader.