CN216306666U - Gear shifting gearbox and engineering machinery gear shifting system - Google Patents

Abstract

The utility model relates to the field of gearboxes and discloses a gear shifting gearbox and an engineering machinery gear shifting system. According to the gear shifting gearbox, one shell gear is connected with the two clutches, so that the overall structure of the gearbox is more compact; the third shell gear meshed with the second shell gear, the third double gear and the three-gear clutch connected with the third shell gear and the third double gear are arranged on the third gear shaft, one gear on the third double gear is meshed with one gear on the second gear, the other gear on the third double gear is meshed with the output gear on the output shaft, under the condition that the reverse gear is not arranged, the steering of the output shaft is changed through the number change of gear pairs, an intermediate shaft is not required to be arranged, the reverse gear function is realized, the number of shafting is effectively reduced, the shaft distance from the input shaft to the output shaft of the gearbox is reduced, and the space occupied by gear shifting and speed changing is reduced.

Description

Gear shifting gearbox and engineering machinery gear shifting system

Technical Field

The utility model relates to the field of gearboxes, in particular to a gear shifting gearbox and an engineering machinery gear shifting system.

Background

The gear shifting transmission mainly realizes different transmission lines by changing the state of a clutch, and is used for realizing different output rotating speeds so as to meet actual requirements. It is common for a work machine to have three forward gears and three reverse gears.

The existing gear shifting gearbox has the defects of complex structure and large wheel base, and on the traveling equipment with height limit requirements for mining machinery, tunnel traveling machinery and the like, the height of a chassis is low, and the existing gearbox is difficult to meet the use requirements of the whole machine.

Therefore, a gear shifting transmission is needed to solve the above technical problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a gear shifting gearbox with a simple structure and a short wheelbase and an engineering machinery gear shifting system.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a gear shifting transmission box comprises an input shaft fixed with an input gear and an output shaft fixed with an output gear, and further comprises:

a gear shaft, on which is connected with: the transmission comprises a first shell gear, a forward gear selectively connected with the first shell gear through a forward gear clutch, and a first gear selectively connected with the first shell gear through a first gear clutch;

the two keep off the axle, the transmission is connected with on it: the second shell gear is meshed with the first shell gear, the backward gear is meshed with the input gear and is selectively connected with the second shell gear through a backward gear clutch, the second shell gear is selectively connected with the second shell gear through a second gear clutch, and one gear of the second gear duplex gears is meshed with the first gear;

the three-gear shaft is in transmission connection with: a third housing gear engaged with the second housing gear and a third-gear duplicate gear selectively connected with the third housing gear through a third-gear clutch; one gear of the three-gear duplex gear is meshed with the other gear of the two-gear duplex gear, and the other gear of the three-gear duplex gear is meshed with the output gear.

As an optimal technical scheme of the gear shifting gearbox, the gear shifting gearbox further comprises a gearbox body, one end of the input shaft extends into the gearbox body to be suspended in the air to form a cantilever structure, and the input shaft is rotatably connected with the gearbox body through a first bearing.

As a preferable technical scheme of the gear shifting gearbox, an input bearing mounting seat is fixedly mounted on the gearbox body, and the input shaft is rotatably connected with the input bearing mounting seat through two first bearings.

As an optimal technical scheme of the gear shifting gearbox, an output bearing mounting seat is fixedly mounted on the gearbox body, one end of the output shaft is rotatably connected to the gearbox body through a second bearing and penetrates out of the gearbox body, the other end of the output shaft penetrates out of the gearbox body through the output bearing mounting seat, and the output shaft is rotatably connected with the output bearing mounting seat through a third bearing.

As a preferred technical scheme of the gear shifting gearbox, a valve body mounting surface is arranged outside the gearbox body and used for mounting a speed changing valve for controlling a clutch;

and at least two types of mounting interfaces are arranged on the valve body mounting surface and are respectively used for mounting the variable speed valves of different types.

As a preferable technical scheme of the gear shifting gearbox, an off-axle mechanism and/or a parking brake are mounted on the output shaft.

As a preferable technical solution of the above-mentioned shift transmission, the addendum coefficient of the input gear, the forward gear, and the reverse gear is 1.1 to 1.3, and the pressure angle of the gear engaged with the output gear and the third-gear duplicate gear is 22 to 24 °.

As a preferable technical solution of the above-mentioned shift transmission, the number of teeth of the forward gear is equal to the number of teeth of the reverse gear, and the number of teeth of the first housing gear is equal to the number of teeth of the second housing gear.

The utility model further provides an engineering machinery gear shifting system which comprises the gear shifting gearbox.

As an optimal technical scheme of the engineering machinery gear shifting system, the gear shifting system further comprises a lubricating flow-collecting block arranged outside a gearbox body of the gear shifting gearbox, wherein a main oil inlet used for connecting an oil cooling system of the whole vehicle and lubricating oil ports communicated with lubricating oil channels on each shaft in the gear shifting gearbox are arranged on the lubricating flow-collecting block.

The utility model has the beneficial effects that: according to the gear shifting gearbox provided by the embodiment, the first shell gear on the first gear shaft is respectively connected with the forward gear clutch and the first gear clutch, and the second shell gear on the second gear shaft is respectively connected with the backward gear clutch and the second gear clutch, so that one shell gear is used for connecting the two clutches, and the overall structure of the gearbox is more compact; the three-gear shaft is provided with a third shell gear meshed with the second shell gear, a three-gear duplicate gear and a three-gear clutch connected with the third shell gear and the three-gear duplicate gear, one gear on the three-gear duplicate gear is meshed with one gear of the two-gear duplicate gear, the other gear on the three-gear duplicate gear is meshed with an output gear on the output shaft, under the condition that a reverse gear is not arranged, the steering of the output shaft is changed through the number change of gear pairs, the reverse gear function is realized, only three gear shafts, one input shaft and one output shaft are arranged, an intermediate shaft is not required to be arranged, the number of shafting is effectively reduced, the shaft distance between the input shaft and the output shaft of the gearbox is reduced, and the space occupied by the installation of the gearbox is reduced.

The two-gear duplicate gear is arranged on the second-gear shaft, and the three-gear duplicate gear is arranged on the third-gear shaft, so that the speed ratio change adjustment of the whole vehicle can be better adapted, and the requirements of different vehicle types on the speed ratio of the gearbox are met.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.

FIG. 1 is a diagrammatic view of a transmission principle of a gearbox provided by an embodiment of the present invention;

FIG. 2 is a partial structural schematic diagram I of a construction machine gear shifting system provided by the embodiment of the utility model;

fig. 3 is a schematic structural diagram of a part of a shifting system of a construction machine according to an embodiment of the present invention.

In the figure:

10. an input shaft; 11. an input flange; 12. an input bearing mount; 13. an input gear;

20. a stopper shaft; 21. a forward gear; 22. a forward gear clutch; 23. a first housing gear; 24. a first gear clutch; 25. a first gear;

30. a second gear shaft; 31. a reverse gear; 32. a reverse gear clutch; 33. a second housing gear; 34. a second clutch; 35. a first secondary gear; 36. a second secondary gear;

40. a third gear shaft; 41. a third housing gear; 42. a third-gear clutch; 43. a first third gear; 44. a second third gear;

50. an output shaft; 51. a front output flange; 52. an output bearing mount; 53. an output gear; 54. a rear output flange; 55. an auxiliary device;

61. a box cover; 62. a tank body;

70. lubricating the flow collecting block; 71. a first lubricating oil pipe; 72. a second lubricating oil pipe; 73. a third lubricating oil pipe;

81. the forward gear clutch oil pipe; 82. a reverse gear clutch oil pipe; 83. a first gear clutch oil pipe; 84. the second gear is engaged with and disengaged from the oil pipe; 85. three keep off separation and reunion oil pipes.

Detailed Description

In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting of the utility model. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.

As shown in fig. 1 to 3, the present embodiment provides a gear-shifting transmission comprising an input shaft 10 and an output shaft 50 both capable of rotating, wherein an input gear 13 is fixed on the input shaft 10, and an output gear 53 is fixed on the output shaft 50.

The gear shifting gearbox also comprises a first gear shaft 20, a second gear shaft 30 and a third gear shaft 40, wherein both ends of the first gear shaft are fixed, a forward gear 21, a first shell gear 23 and a first gear 25 are arranged on the first gear shaft 20 and are rotationally connected with the first gear shaft, the forward gear 21 is selectively connected with the first shell gear 23 through a forward gear clutch 22, and the first gear 25 is selectively connected with the first shell gear 23 through a first gear clutch 24; the second gear shaft 30 is provided with a second gear duplicate gear rotationally connected with the second gear shaft, a reverse gear 31 meshed with the input gear 13 and a second shell gear 33 meshed with the first shell gear 23, the reverse gear 31 is selectively connected with the second shell gear 33 through a reverse gear clutch 32, the second gear duplicate gear is selectively connected with the second shell gear 33 through a second gear clutch 34, and one gear of the second gear duplicate gear is meshed with the first gear 25; the third gear shaft 40 is provided with a three-gear duplicate gear which is rotationally connected with the third gear shaft and a third shell gear 41 which is meshed with the second shell gear 33, and the third shell gear 41 is selectively connected with the three-gear duplicate gear through a three-gear clutch 42; one of the third-speed duplicate gears is meshed with the other of the second-speed duplicate gears, and the other of the third-speed duplicate gears is meshed with the output gear 53.

In the gear shifting gearbox provided by the embodiment, the first shell gear 23 on the first gear shaft 20 is respectively connected with the forward gear clutch 22 and the first gear clutch 24, and the second shell gear 33 on the second gear shaft 30 is respectively connected with the reverse gear clutch 31 and the second gear clutch 34, so that one shell gear is used for connecting the two clutches, and the overall structure of the gearbox is more compact; the third shell gear 41 and the third gear duplicate gear which are meshed with the second shell gear 33 and the third gear clutch 42 which is connected with the third shell gear 41 and the third gear duplicate gear are arranged on the third gear shaft 40, one gear on the third gear duplicate gear is meshed with one gear of the second gear duplicate gear, the other gear is meshed with the output gear 53 on the output shaft 50, under the condition that no reverse gear is arranged, the steering of the output shaft 50 is changed through the change of the number of gear pairs, the reverse gear function is realized, only three gear shafts, one input shaft 10 and one output shaft 50 are arranged, an intermediate shaft is not needed to be arranged, the number of shafting is effectively reduced, the maximum shaft distance of the gearbox is reduced, and the space occupied by gear shifting and speed changing is reduced.

The two-gear duplicate gear is arranged on the two-gear shaft 30, and the three-gear duplicate gear is arranged on the three-gear shaft 40, so that the speed ratio change adjustment of the whole vehicle can be better adapted, and the requirements of different vehicle types on the speed ratio of a gearbox are met.

In this embodiment, the input shaft 10, the first gear shaft 20, the second gear shaft 30, the third gear shaft 40 and the output shaft 50 are parallel to each other, and the structural layout is compact in structure and capable of effectively reducing the number of shafting.

Two gears of the two-gear duplex gear are respectively a first two-gear 35 and a second two-gear 36, wherein the first two-gear 35 is meshed with the first gear 25; two gears of the three-gear double gear are a first third gear 43 and a second third gear 44, wherein the first third gear 43 is meshed with the second gear 36, and the second third gear 44 is meshed with the output gear 53.

When the gear shifting gearbox is adopted, six gears can be realized, namely a forward first gear, a forward second gear, a forward third gear, a backward first gear, a backward second gear and a backward third gear, and the transmission route and the transmission ratio of each gear are briefly described below.

The number of teeth of each gear is defined, specifically, the number of teeth of the input gear 13 is Z1, the number of teeth of the forward gear 21 is Z2, the number of teeth of the first gear 25 is Z3, the number of teeth of the first casing gear 23 is Z4, the number of teeth of the reverse gear 31 is Z5, the number of teeth of the second casing gear 33 is Z6, the number of teeth of the first second gear 35 is Z7, the number of teeth of the second gear 36 is Z8, the number of teeth of the third casing gear 41 is Z9, the number of teeth of the first third gear 43 is Z10, the number of teeth of the second third gear 44 is Z11, and the number of teeth of the output gear 53 is Z12.

The forward clutch 22 and the first clutch 24 are engaged, the other clutches are disengaged, and the transmission is shifted to forward first gear. Drive line of forward first gear: the power is input through the input shaft 10 to drive the input gear 13 to rotate, the input gear 13 is meshed with the forward gear 21 to transmit the power to the forward gear 21, the power of the forward gear 21 is transmitted to the first gear 25 through the forward clutch 22 and the first gear clutch 24, the first gear 25 is meshed with the first second gear 35 to transmit the power to the first second gear 35, the first second gear 35 transmits the power to the first third gear 43 meshed with the second gear 36, and the first third gear 43 transmits the power to the output gear 53 meshed with the second third gear 44, so that the power is output through the output shaft 50.

Forward first gear ratio

The forward clutch 22 and the second clutch 34 are engaged, the other clutches are all disengaged, and the transmission is shifted to the forward second gear. The transmission route of the forward second gear is as follows: the power is input through the input shaft 10 to drive the input gear 13 to rotate, the input gear 13 is meshed with the forward gear 21 to transmit the power to the forward gear 21, the forward gear 21 transmits the power to the first housing gear 23 through the forward clutch 22, the first housing gear 23 transmits the power to the second housing gear 33 meshed therewith, the second housing gear 33 transmits the power to the second two-gear 36 in the two-gear double gear through the two-gear clutch 34, the second two-gear 36 transmits the power to the first three-gear 43 in the three-gear double gear meshed therewith, and the first three-gear 43 transmits the power to the output gear 53 meshed with the second three-gear 44, so that the power is output through the output shaft 50.

Forward two gear transmission ratio

The forward clutch 22 and the third clutch 42 are engaged, the other clutches are disengaged, and the transmission is shifted to forward third gear. The transmission route of the forward third gear is as follows: the power is input through the input shaft 10 to drive the input gear 13 to rotate, the input gear 13 is meshed with the forward gear 21 to transmit the power to the forward gear 21, the forward gear 21 transmits the power to the first housing gear 23 through the forward clutch 22, the first housing gear 23 transmits the power to the second housing gear 33 meshed with the first housing gear, the second housing gear 33 transmits the power to the third housing gear 41 meshed with the second housing gear, the third housing gear 41 transmits the power to the second third gear 44 in the three-gear double gear through the three-gear clutch 42, and the second third gear 44 transmits the power to the output shaft 50 through the output gear 53 meshed with the second third gear to output.

Forward three speed transmission ratio

The reverse clutch 32 and the first clutch 24 are engaged, the other clutches are disengaged and the gearbox is shifted to reverse first gear. Reverse first gear transmission route: the input gear 13 is driven to rotate by the input of power through the input shaft 10, the input gear 13 transmits power to the reverse gear 31 engaged therewith, the reverse gear 31 transmits power to the second housing gear 33 through the reverse gear clutch 32, the second housing gear 33 transmits power to the first housing gear 23 engaged therewith, the first housing gear 23 transmits power to the first gear 25 through the first gear clutch 24, the first gear 25 is engaged with the first second gear 35 to transmit power to the first second gear 35, the first second gear 35 transmits power to the first third gear 43 engaged with the second gear 36, and the first third gear 43 transmits power to the output gear 53 engaged with the second third gear 44, so that the power is output through the output shaft 50.

Reverse first gear ratio

The reverse clutch 32 and the second clutch 34 are closed, the other clutches are open, and the gearbox is switched to reverse second gear. And (3) backing a transmission route of the second gear: power is input through the input shaft 10 to drive the input gear 13 to rotate, the input gear 13 transmits the power to the reverse gear 31 engaged therewith, the reverse gear 31 transmits the power to the second two gear 36 of the two-gear double gears through the reverse gear clutch 32 and the second gear clutch 34, the second two gear 36 transmits the power to the first three gear 43 of the three-gear double gears engaged therewith, and the first three gear 43 transmits the power to the output gear 53 engaged with the second three gear 44, so that the power is output through the output shaft 50.

Reverse second gear ratio

The reverse clutch 32 and the third clutch 42 are closed, the other clutches are opened, and the shift speed is switched to the reverse third gear. In the transmission route of the third reverse gear, power is input through the input shaft 10 to drive the input gear 13 to rotate, the input gear 13 transmits the power to the reverse gear 31 meshed with the input gear, the reverse gear 31 transmits the power to the second shell gear 33 through the reverse gear clutch 32, the second clutch transmits the power to the third shell gear 41 meshed with the reverse gear, the third shell gear 41 transmits the power to the second third gear 44 in the third-gear duplicate gear through the third-gear clutch 42, and the second third gear 44 transmits the power to the output shaft 50 through the output gear 53 meshed with the second third gear 44 to output.

Reverse third gear transmission ratio

In the present embodiment, the number of teeth is limited such that the number of teeth of the forward gear 21 is equal to that of the reverse gear 31, the number of teeth of the first casing gear 23 is equal to that of the second casing gear 33, i.e., Z2 is equal to Z5, and Z6 is equal to Z4, so that the gear ratio of the first forward gear is equal to that of the first reverse gear, the gear ratio of the second forward gear is equal to that of the second reverse gear, and the gear ratio of the third forward gear is equal to that of the third reverse gear. When two drive axles with different output directions are matched, the output directions of the whole vehicle can be the same only by exchanging the oil paths of the forward gear clutch 22 and the reverse gear clutch 32.

Further, above-mentioned gearbox of shifting still includes the gearbox body, and the gearbox body includes case body 62 and case lid 61, and case body 62 and case lid 61 can be dismantled and be connected, have improved gearbox of shifting parts machining process feasibility and assembly process feasibility, make things convenient for follow-up maintenance, have reduced the technical requirement that carries out maintenance to the gearbox of shifting in the use. Specifically, the box body 62 and the box cover 61 are connected together by a plurality of bolts and positioning pins.

Furthermore, one end of the input shaft 10 extends into the transmission case body and is suspended to form a cantilever structure, and the input shaft 10 is rotatably connected with the transmission case body through a first bearing. In this embodiment, one end of the input shaft 10 is suspended to form a cantilever structure, and only one input gear 13 is mounted thereon. Preferably, the input gear 13 is disposed close to a first sidewall of the transmission case connected to the input shaft 10, so that an installation space between a second sidewall of the transmission case facing the first sidewall and the input gear 13 is large, and an installation space is provided for the gears on the first gear shaft 20, thereby reducing a wheel base between the input shaft 10 and the output shaft 50.

Further, an input bearing mounting seat 12 is fixedly mounted on the transmission case, and the input shaft 10 is rotatably connected with the input bearing mounting seat 12 through two first bearings. The input shaft 10 is supported through the input bearing mounting seat 12 and the two first bearings, the stability of the input shaft 10 is improved, the input shaft 10 only provided with the input gear 13 is of a cantilever structure, the influence of the input bearing mounting seat 12 on the gear meshing center distance is eliminated, the distance between the input shaft 10 and the output shaft 50 can be effectively reduced, and the design requirement of a short-wheelbase gearbox is met.

In the embodiment, one end of the input shaft 10 extends out of the gearbox body and is connected with an input flange 11, and the input shaft 10 is connected with a power source through the input flange 11; the other end of the input shaft 10 extends into the gearbox body and is connected with an input gear 13 through a spline; the input bearing mount 12 is attached to the case cover 61 by a plurality of circumferentially arranged bolts. It should be noted that the input shaft 10 and the input gear 13 may be integrally provided.

Further, the forward clutch 22 and the first clutch 24 share a first housing to form a double clutch structure, and the first housing gear 23 is fixedly attached to the first housing. The forward gear 21, the forward clutch 22, the first gear 25, the first gear clutch 24, and the first housing gear 23 are each rotatably mounted on a first gear shaft 20 through bearings. Two ends of a baffle shaft 20 are respectively inserted into a first mounting hole on the box cover 61 and a second mounting hole on the box body 62, and the end surface of the baffle shaft 20 and the box body 62 are rigidly mounted through bolts; the components of a retaining shaft 20 are axially positioned by a shoulder on the retaining shaft 20 and a boss end surface on the inner side of the box cover 61.

Further, the reverse clutch 32 and the second clutch 34 share a second housing to form a double clutch structure, and the second housing gear 33 is fixedly attached to the second housing. The reverse gear 31, the reverse gear clutch 32, the second-gear double gear, the second-gear clutch 34, and the second housing gear 33 are rotatably mounted on the second-gear shaft 30 through bearings, respectively. Two ends of the second blocking shaft 30 are respectively inserted into a third mounting hole on the box cover 61 and a fourth mounting hole on the box body 62, and the end surface of the second blocking shaft 30 and the box body 62 are rigidly mounted through bolts; each component on the second blocking shaft 30 is axially positioned through a shaft shoulder on the second blocking shaft 30 and a boss end surface on the inner side of the box cover 61.

In the embodiment, the double clutch structures are respectively arranged on the first gear shaft 20 and the second gear shaft 30, so that the number of shafts is effectively reduced, the structure of the gear shifting gearbox is more compact under the condition of realizing the same gear, and conditions are created for realizing the design requirement of the short wheelbase of the gearbox.

Further, the third clutch 42 has a single clutch structure, and the third housing gear 41 is fixed to the housing of the third clutch 42. The third housing gear 41, the third clutch 42 and the third double gear are each rotatably mounted on the third gear shaft 40 through bearings. Two ends of the third blocking shaft 40 are respectively inserted into a fifth mounting hole on the box cover 61 and a sixth mounting hole on the box body 62, and the end surface of the third blocking shaft 40 and the box body 62 are rigidly mounted through bolts; each component on the third-gear shaft 40 is axially positioned through a shaft shoulder on the third-gear shaft 40 and a boss end surface on the inner side of the box cover 61.

Further, an output bearing mounting seat 52 is fixedly mounted on the transmission case, one end of the output shaft 50 is rotatably connected to the transmission case through a second bearing and penetrates out of the transmission case, the other end of the output shaft penetrates out of the transmission case through the output bearing mounting seat 52, and the output shaft 50 is rotatably connected with the output bearing mounting seat 52 through a third bearing.

In this embodiment, the output shaft 50 has a first end and a second end that are arranged oppositely, wherein the first end is rotatably connected to the transmission case through the second bearing and stretches out the transmission case to connect with the rear output flange 54, the second end is rotatably connected to the bearing mounting base through the third bearing and stretches out the transmission case to connect with the front output flange 51, and the power on the output shaft 50 is transmitted to the drive axle of the whole vehicle through the front output flange 51 and the rear output flange 54 to drive the wheels to walk.

More specifically, the output shaft 50 is rigidly connected to the output gear 53, the rear output flange 54, and the front output flange 51 by splines, respectively, and the output bearing mount 52 is fixedly mounted to the case body 62 by a plurality of circumferentially arranged bolts.

The output gear 53 on the output drawer 50 is arranged close to the front output flange 51 to increase the space between the output gear 53 and the rear output flange 54, so that different auxiliary devices 55 such as a bridge disengaging mechanism and a parking brake can be installed according to the requirements of the whole vehicle, wherein the bridge disengaging mechanism is used for realizing the switching between four-wheel drive and two-wheel drive, the parking brake is used for realizing the parking brake function, and the specific structures and how to install the bridge disengaging mechanism and the parking brake are the prior art, and detailed description is omitted.

Furthermore, a valve body mounting surface is arranged outside the gearbox body and used for mounting a speed change valve for controlling the clutch; at least two types of mounting interfaces are arranged on the mounting surface of the valve body and are respectively used for mounting different types of variable speed valves. The type of the speed change valve can be selected according to actual requirements, such as an electric control valve, a machine control valve, a pneumatic control valve or an electric proportional control valve, the requirements of the use working condition of the whole vehicle are met by assembling different types of speed change valves on the same gearbox, and the universality of the gear shifting gearbox body is improved. For example, the explosion-proof environment uses a machine-controlled valve, and the remote control uses an electric-controlled valve.

The speed change valve mainly provides high-pressure oil for a finished automobile working pump for the clutch through the movement of a direction valve core and a gear valve core in the speed change valve so as to realize the combination or separation of different clutches, realize the power transmission requirement of each gear of the gearbox, return redundant oil to an oil cooling system of the finished automobile, and return to a lubricating system of the gearbox after being cooled by the oil cooling system of the finished automobile to perform forced lubrication on each part of the gearbox.

It should be noted that each clutch in the present embodiment is a plurality of wet copper-based friction plates, and a clutch structure of a paper-based friction plate or a friction plate made of other friction materials may also be adopted.

Specifically, gear oil pipes such as a forward gear clutch oil pipe 81, a reverse gear clutch oil pipe 82, a first gear clutch oil pipe 83, a second gear clutch oil pipe 84 and a third gear clutch oil pipe 85 are arranged outside the transmission body, wherein the forward gear clutch oil pipe 81 is used for communicating a forward gear oil passage of the speed change valve with an oil passage of the forward gear clutch 22, the reverse gear clutch oil pipe 82 is used for communicating a reverse gear oil passage of the speed change valve with an oil passage of the reverse gear clutch 32, the first gear clutch oil pipe 83 is used for communicating a first gear oil passage of the speed change valve with an oil passage of the first gear clutch 24, the second gear clutch oil pipe 84 is used for communicating a second gear oil passage of the speed change valve with an oil passage of the second gear clutch 34, and the third gear clutch oil pipe 85 is used for communicating a third gear oil passage of the speed change valve with an oil passage of the third gear clutch 42. The state of the clutch is adjusted by adjusting the state of the speed change valve, so that the clutch is combined and separated, and the power transmission requirement of each gear of the gearbox is met.

Furthermore, the tooth crest coefficient of the input gear 13, the forward gear 21 and the reverse gear 31 is 1.1-1.3, and compared with a standard gear with the tooth crest coefficient of 1, the tooth number participating in meshing is increased, and the high-speed and low-noise requirements of the input gear 13 are met. The pressure angle of the output gear 53 and the second-third speed gear 44 is 22 ° to 24 °. Compared with a standard gear with a pressure angle of 20 degrees, the bending strength of a single gear is improved, the torque transmission capacity of the gear is improved, and the requirement of the output gear 53 on low-speed heavy load is met. By specially designing the tooth crest factor of the input gear 13 and the pressure angle of the output gear 53, the high-speed low-noise requirement of the input gear 13 is satisfied, and the low-speed heavy-load requirement of the output gear 53 is satisfied.

The embodiment also provides an engineering machinery gear shifting system which comprises the gear shifting gearbox.

Further, the engineering machinery gear shifting system further comprises a lubricating flow concentration block 70 arranged outside the gearbox body of the gear shifting gearbox, wherein a main oil inlet, a first lubricating oil port, a second lubricating oil port, a third lubricating oil port, a fourth lubricating oil port and a fifth lubricating oil port are formed in the lubricating flow concentration block 70, and the main oil inlet is used for being connected with a whole vehicle oil cooling system; the first lubricating oil port is connected with a first lubricating oil passage through a first lubricating oil pipe 71 and is used for lubricating parts mounted on the input shaft 10; the second lubricating oil port is connected with a second lubricating oil channel through a second lubricating oil pipe 72 and is used for lubricating parts arranged on a baffle shaft 20; the third lubricating oil port is connected with a third lubricating oil passage through a third lubricating oil pipe 73 and is used for lubricating parts arranged on the second baffle shaft 30; the fourth lubricating oil port is connected with a fourth lubricating oil channel through a fourth lubricating oil pipe and is used for lubricating parts arranged on the third baffle shaft 40; the fifth lubricating oil port is connected with a fifth lubricating oil passage through a fifth lubricating oil pipe and is used for lubricating parts mounted on the output shaft 50.

In the embodiment, the lubricating manifold block 70, the first lubricating oil pipe 71, the second lubricating oil pipe 72, the third lubricating oil pipe 73, the fourth lubricating oil pipe and the fifth lubricating oil pipe are arranged outside the gearbox body, so that the processing and manufacturing difficulty of the gearbox is simplified, and the difficulty of daily fault analysis, judgment, maintenance and repair of the gearbox is reduced.

The engineering machinery gear shifting system provided by the embodiment simplifies the layout of lubricating oil by additionally arranging the lubricating flow collecting block 70, provides lubricating oil through the whole vehicle oil cooling system, provides lubricating oil through the lubricating flow collecting block 70 to perform forced lubrication on all parts in the gearbox, and improves the service life and reliability of parts of the gearbox.

The gear shifting gearbox provided by the embodiment is mainly used for traveling equipment with limited high requirements such as mining machinery and tunnel traveling machinery, the distance between the input shaft 10 and the output shaft 20 of the gear shifting gearbox is small, and the mounting requirement of a low chassis of a whole vehicle can be met; the shaft distance of the gearbox with three forward gears and three reverse gears can be reduced to be within 300mm by only arranging the input shaft 10 of the input gear 13 to be in a cantilever structure and matching with a double clutch structure arranged on the first gear shaft 20 and the second gear shaft 30.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but 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, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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 in specific cases to those skilled in the art.

Claims (10)

1. A gear change gearbox comprising an input shaft (10) to which an input gear (13) is fixed, and an output shaft (50) to which an output gear (53) is fixed, characterised by further comprising:

a gear shaft (20) on which is drivingly connected: a first housing gear (23), a forward gear (21) selectively connected to the first housing gear (23) through a forward gear clutch (22), and a first gear (25) selectively connected to the first housing gear (23) through a first gear clutch (24);

the second gear shaft (30) is in transmission connection with: a second housing gear (33) meshed with the first housing gear (23), a reverse gear (31) meshed with the input gear (13) and selectively connected with the second housing gear (33) through a reverse gear clutch (31), and a second-gear duplicate gear selectively connected with the second housing gear (33) through a second-gear clutch (34), wherein one gear of the second-gear duplicate gear is meshed with the first-gear (25);

the three-gear shaft (40) is in transmission connection with: a third housing gear (41) engaged with the second housing gear (33) and a three-gear duplicate gear selectively connected with the third housing gear (41) through a three-gear clutch (42); one gear of the three-gear duplicate gear is meshed with the other gear of the two-gear duplicate gear, and the other gear of the three-gear duplicate gear is meshed with the output gear (53).

2. The gear shifting gearbox is characterized by further comprising a gearbox body, one end of the input shaft (10) extends into the gearbox body and is arranged in a suspended mode to form a cantilever structure, and the input shaft (10) is rotatably connected with the gearbox body through a first bearing.

3. A gearbox according to claim 2, characterised in that an input bearing mount (12) is fixedly mounted to the gearbox housing, and the input shaft (10) is rotatably connected to the input bearing mount (12) by two said first bearings.

4. The manual transmission according to claim 2, wherein an output bearing mounting seat (52) is fixedly mounted on the transmission housing, one end of the output shaft (50) is rotatably connected to the transmission housing through a second bearing and penetrates out of the transmission housing, the other end of the output shaft penetrates out of the transmission housing through the output bearing mounting seat (52), and the output shaft (50) is rotatably connected with the output bearing mounting seat (52) through a third bearing.

5. The gear shifting gearbox is characterized in that a valve body mounting surface is arranged outside the gearbox body and used for mounting a speed changing valve for controlling a clutch;

and at least two types of mounting interfaces are arranged on the valve body mounting surface and are respectively used for mounting the variable speed valves of different types.

6. A shiftable gearbox according to claim 1, wherein an off-bridge mechanism and/or a parking brake is mounted on the output shaft (50).

7. A shiftable transmission according to claim 1, wherein the coefficient of addendum of the input gear (13), the forward gear (21) and the reverse gear (31) is 1.1 to 1.3, and the pressure angle of the gear meshing with the output gear (53) and the third range duplicate gear is 22 ° to 24 °.

8. A manual gearbox according to claim 1, characterised in that the number of teeth of said forward gear wheel (21) is equal to the number of teeth of said reverse gear wheel (31) and the number of teeth of said first housing gear wheel (23) is equal to the number of teeth of said second housing gear wheel (33).

9. A work machine gear shift system comprising a gear shift gearbox according to any of claims 1 to 8.

10. The engineering machinery gear shifting system according to claim 9, further comprising a lubricating manifold block (70) arranged outside the transmission body of the gear shifting transmission, wherein a main oil inlet for connecting an oil cooling system of a whole vehicle and lubricating oil ports which are in one-to-one correspondence and communication with lubricating oil channels on each shaft in the gear shifting transmission are arranged on the lubricating manifold block (70).

Images