CN116221365A - Double-motor fixed-shaft type gearbox and electric loader - Google Patents

Abstract

The invention relates to a gearbox, which aims to solve the defect caused by mutual independence of a traveling system gearbox and a hydraulic system transfer case in the existing electric loader. The invention combines the oil pump driving transmission and the walking variable speed transmission into a whole, is centralized in lubrication, has simple structure and is convenient to be arranged on a machine.

Description

Double-motor fixed-shaft type gearbox and electric loader

Technical Field

The invention relates to a gearbox, in particular to a double-motor fixed-shaft gearbox and an electric loader.

Background

The power system of the existing electric loader comprises a walking motor and a hydraulic motor, wherein the walking motor is connected with a gearbox, and power is transmitted to a drive axle through the gearbox and a transmission shaft. The hydraulic motor is connected with the transfer case, drives the working pump, the steering pump and the like through the transfer case, drives the hydraulic pump to work, and provides pressure oil for a working device, a steering system, a braking system and the like of the loader.

On the existing electric loader, the transfer case and the gearbox are two independent cases, so that the two cases are required to be arranged in a larger installation space in the machine, and meanwhile, the transfer case is required to be provided with an independent lubrication system for lubricating gears and rotating shafts in the transfer case. Therefore, the transfer case and the gearbox of the existing electric loader are arranged separately, and the problems of complex structure, large occupied space, high cost and the like exist.

Disclosure of Invention

The invention aims to solve the technical problem that a traveling system gearbox and a hydraulic system transfer case in the existing electric loader are mutually independent, and provides a double-motor fixed-shaft gearbox and the electric loader.

The technical scheme for achieving the purpose of the invention is as follows: the double-motor fixed-shaft gearbox is characterized by comprising an oil pump driving gear shaft system and a traveling driving gear shaft system which are arranged in the same box body, wherein the oil pump driving gear shaft system comprises a first shaft and a second shaft connected with the first shaft through gear engagement, a hydraulic motor mounting interface matched with the first shaft is arranged on the front side wall of the box body, and a first pump PTO interface and a second pump PTO interface respectively matched with the first shaft and the second shaft are arranged on the rear side wall of the box body; the novel hydraulic oil tank is characterized in that a first shaft lubricating oil passage and a second shaft lubricating oil passage which are axially communicated are respectively arranged in the first shaft and the second shaft, the second shaft is arranged above the first shaft, a first oil passage which is communicated with the top of a space in a hydraulic motor mounting interface ring is arranged at the bottom of a cavity at the front end of the second shaft, a second oil passage which is communicated with the space in the box is arranged at the bottom of the space in the hydraulic motor mounting interface ring, a second shaft lubricating joint which is communicated with the cavity at the front end of the second shaft is arranged on the front side wall of the box, and the second shaft lubricating joint is communicated with a lubricating oil outlet of a speed change control valve on the box through a pipeline.

In the invention, the oil pump driving gear shaft system and the traveling driving gear shaft system for driving the working pump and the steering pump are both arranged in the same box body, and the oil pump driving gear shaft system is lubricated through the lubricating oil duct, so that the driving transmission and the traveling variable speed transmission of the oil pump are combined into one, the structure is simplified, and the arrangement on a machine is convenient.

In the double-motor fixed-shaft type gearbox, two radial reinforcing ribs extending upwards in an inclined mode are arranged in a hydraulic motor mounting interface ring of the gearbox body, an outlet of a first oil duct is positioned at the top of a space between the two radial reinforcing ribs, and a front-end mounting shaft hole of the first shaft is positioned at the bottom of the space between the two radial reinforcing ribs.

In the double-motor fixed-shaft type gearbox, the walking driving gear shafting comprises a third shaft, a first gear shifting shaft assembly, a second gear shifting shaft assembly and a fourth shaft which are connected through gear meshing transmission, wherein the front end and the rear end of the fourth shaft are connected with output connecting flanges; the novel gearbox is characterized in that a travelling motor installation interface matched with a third shaft is arranged on the front side wall of the gearbox body, a third shaft lubricating oil passage which is axially communicated is arranged in the third shaft, a third oil passage which is communicated with the space in the gearbox body is arranged at the bottom of the space in the travelling motor installation interface ring, a third shaft lubricating oil joint which is communicated with a third shaft rear end chamber is arranged on the rear side wall of the gearbox body, and the third shaft lubricating oil joint is communicated with a lubricating oil outlet of a speed change control valve on the gearbox body through a pipeline.

In the double-motor fixed-shaft type gearbox, a second driving gear is fixedly arranged on the third shaft; the first gear shifting shaft assembly comprises a first gear shifting shaft, a second driven gear fixedly arranged on the first gear shifting shaft and meshed with the second driving gear, a low-speed gear clutch with a driving end connected with the first gear shifting shaft through a spline, and a low-speed gear driving gear arranged on the first gear shifting shaft and connected with the driven end of the low-speed gear clutch through a spline; the second gear shifting shaft assembly comprises a second gear shifting shaft, a high-speed gear clutch, a high-speed gear driven gear, a low-speed gear driven gear and a third driving gear, wherein the driven end of the high-speed gear clutch is connected with the second gear shifting shaft through a spline, the high-speed gear driven gear is arranged on the second gear shifting shaft and is connected with the driving end of the high-speed gear clutch through the spline, the low-speed gear driven gear is fixedly arranged on the second gear shifting shaft and is meshed with the low-speed gear driving gear, and the high-speed gear driven gear is meshed with the high-speed gear driving gear; and a third slave gear meshed with the third driving gear is fixedly arranged on the fourth shaft.

Or in the double-motor fixed-shaft gearbox, the second driving gear is fixedly arranged on the third shaft; the first gear shifting shaft assembly comprises a first gear shifting shaft, a second driven gear and a high-speed gear driving gear which are fixedly arranged on the first gear shifting shaft and meshed with the second driving gear, a low-speed gear clutch with a driving end connected with the first gear shifting shaft through a spline, and a low-speed gear driving gear which is arranged on the first gear shifting shaft and connected with a driven end of the low-speed gear clutch through a spline; the second gear shifting shaft assembly comprises a second gear shifting shaft, a high-speed gear clutch, a high-speed gear driven gear and a low-speed gear driven gear, wherein the driven end of the high-speed gear clutch is connected with the second gear shifting shaft through a spline, the high-speed gear driven gear is arranged on the second gear shifting shaft and is connected with the driving end of the high-speed gear clutch through a spline, the low-speed gear driven gear is fixedly arranged on the second gear shifting shaft, the low-speed gear driven gear is meshed with the low-speed gear driving gear, and the high-speed gear driven gear is meshed with the high-speed gear driving gear; and a third driven gear meshed with the low-gear driven gear is fixedly arranged on the fourth shaft.

In the double-motor fixed-shaft gearbox, a first gear shifting shaft end cover and a second gear shifting shaft end cover are arranged on the rear side wall of the gearbox body, and are respectively provided with gear shifting shaft lubricating oil joints communicated with a lubricating oil outlet of a speed changing control valve through pipelines, and each gear shifting shaft lubricating oil joint is communicated with a lubricating oil duct on the gear shifting shaft through an oil duct between the rear end of the corresponding gear shifting shaft and the gear shifting shaft end cover.

In the double-motor fixed-shaft gearbox, each lubricating oil joint is directly connected with a lubricating oil outlet of a speed-change control valve through an oil pipe.

In the double-motor fixed-shaft gearbox, a lubricating oil outlet of a speed change control valve on a box body is connected with an oil inlet of a gear shifting shaft lubricating oil joint on a second gear shifting shaft end cover through a first oil pipe, an oil outlet of the gear shifting shaft lubricating oil joint on the second gear shifting shaft end cover is connected with an oil inlet of the gear shifting shaft lubricating oil joint on the first gear shifting shaft end cover through a second oil pipe, an oil outlet of the gear shifting shaft lubricating oil joint on the first gear shifting shaft end cover is connected with an oil inlet interface of a third shaft lubricating oil joint through a third oil pipe, and an oil outlet interface of the third shaft lubricating oil joint is connected with a second shaft lubricating oil joint through a fourth oil pipe.

In the double-motor fixed-shaft type gearbox, the second shaft and the third shaft are arranged at the left and right parts of the upper part of the box body, the fourth shaft is arranged at the lower part of the box body, and the first shaft, the first gear shifting shaft and the second gear shifting shaft are arranged at the middle part of the box body.

The technical scheme for achieving the purpose of the invention is as follows: an electric loader is constructed, which is characterized by comprising the double-motor fixed-shaft gearbox.

Compared with the prior art, the oil pump driving gear shaft system and the traveling driving gear shaft system are both arranged in the same box body, and the oil pump driving gear shaft system is lubricated through the lubricating oil duct, so that the driving transmission of the oil pump and the traveling variable speed transmission are combined into a whole, the structure is simplified, and the oil pump driving gear shaft system is convenient to arrange on a machine.

Drawings

Fig. 1 is a schematic diagram of the drive train of the electric loader of the present invention.

Fig. 2 is a schematic diagram of a lubrication circuit of a dual-motor fixed-shaft gearbox of an electric loader according to the invention.

Fig. 3 is a schematic view of the front upper part of the dual motor fixed shaft type gearbox of the electric loader of the present invention.

Fig. 4 is a sectional view taken along the direction B in fig. 3.

Fig. 5 is a schematic view of the rear upper part of the dual motor fixed shaft type gearbox of the electric loader of the present invention.

Fig. 6 is a schematic diagram of the arrangement of lubrication oil paths of a third shaft in the dual-motor fixed-shaft gearbox of the electric loader of the invention.

Fig. 7 is a schematic diagram of the arrangement of lubrication oil paths of shift shafts in the dual-motor fixed-shaft gearbox of the electric loader.

Fig. 8 is a schematic diagram of another embodiment of the drive train of the electric loader of the present invention.

Part names and serial numbers in the figure:

a gearbox 200.

A first drive axle 11, a second drive axle 12, a first transmission shaft 13, a second transmission shaft 14.

The box 20, the annular boss 21, the second shaft front end chamber 211, the first oil duct 212, the third shaft rear end chamber 22.

The hydraulic motor 31, the hydraulic motor mounting interface 311, the hydraulic motor mounting interface ring inner space 312, the first radial reinforcing rib 313, the second radial reinforcing rib 314, the second oil duct 315, the traveling motor 32, the traveling motor mounting interface 321, the traveling motor mounting interface ring inner space 322, and the third oil duct 323.

The first shaft 41, the first shaft lubrication oil passage 411, the first pump PTO interface 412, the second shaft 42, the second shaft lubrication oil passage 421, the second pump PTO interface 422, the second shaft lubrication joint 423, the first driving gear 43, and the first driven gear 44.

A third shaft 51, a third shaft lubrication oil passage 511, a third shaft lubrication joint 512, and a second drive gear 52.

The first shift shaft 61, the first lubrication oil passage 611, the first shift oil passage 612, the first shift shaft end cover 613, the low gear shift joint 614, the first oil inlet joint 615, the first oil outlet joint 616, the second driven gear 62, the low gear clutch 63, the low gear drive gear 64, and the high gear drive gear 65.

The second shift shaft 71, the second lubrication oil passage 711, the second shift oil passage 712, the second shift shaft end cover 713, the high gear shift joint 714, the second oil feed joint 715, the second oil discharge joint 716, the low gear driven gear 72, the third driving gear 73, the high gear driven gear 74, the high gear clutch 75, and the low gear driven gear 76.

A fourth shaft 81, a third driven gear 82, a front connection flange 83, a rear connection flange 84.

A shift control valve 90, a second shift oil pipe 91, a first shift oil pipe 92, a first oil pipe 93, a second oil pipe 94, a third oil pipe 95, and a fourth oil pipe 96.

Detailed Description

The following describes specific embodiments with reference to the drawings.

Fig. 1 shows a schematic diagram of a drive train of an electric loader in an embodiment of the invention. As shown in fig. 1, the electric loader includes a double-motor fixed-shaft gearbox 200, a hydraulic motor 31, and a travel motor 32. An oil pump drive gear system and a traveling drive gear system are simultaneously installed in the case 20 of the transmission.

The oil pump driving gear system comprises a first shaft 41, a second shaft 42, a first driving gear 43 fixed on the first shaft 41 and a first driven gear 44 fixed on the second shaft 42, wherein the first driving gear 43 is meshed with the first driven gear 44, and the front end and the rear end of the first shaft 41 and the rear end of the second shaft 42 are respectively connected with the box body in a rotating way through bearings.

In the invention, the directions of front, back, upper, lower and the like are based on the direction of a gearbox body, wherein the side wall surface of the gearbox body, on which a traveling motor and a hydraulic motor are mounted, is a front side wall, and the side wall on which a steering pump and a working pump are mounted is a rear side wall. The up and down directions are the up and down directions of the gear box in the vertical direction after the gear box is installed.

The travel drive gear train includes a third shaft 51, a first shift shaft assembly, a second shift shaft assembly, and a fourth shaft 81 that are in driving connection through gear engagement. The front and rear ends of the third shaft 51 are rotatably mounted on the case 20 with respective bearings, and a second driving gear 52 is fixedly mounted on the third shaft 51.

The first shift shaft assembly includes a first shift shaft 61, a second driven gear 62 fixedly mounted on the first shift shaft 61, a low clutch 63, and a low driving gear 64. The drive end of the low clutch 63 is splined to the first shift shaft 61. The low gear drive gear 64 is rotatably mounted on the first shift shaft 61 and is splined to the driven end of the low gear clutch 63.

The second shift shaft assembly includes a second shift shaft 71, a third driving gear 73 and a low-gear driven gear 72 fixedly mounted on the second shift shaft 71, a high-gear clutch 75, and a high-gear driven gear 74. The drive end of the high clutch 75 is spline-connected to the high driven gear 74. The driven end of the high clutch 75 is spline-connected to the second shift shaft 71, and the low driven gear 72 is meshed with the low driving gear 64. The high-gear driven gear 74 meshes with the second driven gear 62.

The front and rear ends of the fourth shaft 81 are rotatably mounted on the front and rear side walls of the case through bearings, respectively, and a third driven gear 82 is fixedly mounted on the fourth shaft 81, and the third driven gear 82 is engaged with the third driving gear 73. The fourth shaft 81 is an output shaft, and a front output connection flange 83 and a rear output connection flange 84 are respectively connected to the front and rear ends thereof, the front output connection flange 83 is connected to the first drive axle 11 through the first transmission shaft 13, and the rear output connection flange 84 is connected to the second drive axle 12 through the second transmission shaft 14. The first drive axle 11 and the second drive axle 12 are a front drive axle and a rear drive axle of the electric loader. The first shaft 41 and the third shaft 51 are both input shafts, wherein the first shaft 41 is connected with a rotating shaft of the hydraulic motor 31, and the third shaft 51 is connected with a rotating shaft of the traveling motor 32.

As shown in fig. 3 to 5, the second shaft 42 and the third shaft 51 are arranged at a left-right interval and are located at an upper portion of the case. The arrangement of the second shaft 42 and the third shaft 51 is approximately the same in height. The fourth shaft 81 is disposed at the lower portion of the case. The first shaft 41, the first shift shaft 61, and the second shift shaft 71 are arranged in the middle of the case, and the first shaft 41, the first shift shaft 61, and the second shift shaft 71 are arranged to be approximately the same in height. The first shaft and the third bearing are diagonally arranged, and the center distance between the two shafts is increased, so that the hydraulic motor and the walking motor are conveniently arranged on the front side of the box body.

As shown in fig. 3, a travel motor mounting interface 321 adapted to the third shaft 51 and a hydraulic motor mounting interface 311 adapted to the first shaft 71 are provided on the front side wall of the case 20. The traveling motor mounting interface 321 is used for being connected with the housing of the traveling motor 32, and a traveling motor mounting interface ring inner space 322 which is not communicated with the outside is formed in the ring of the traveling motor mounting interface 321 between the case 20 and the housing of the traveling motor 32. The rotating shaft of the traveling motor 32 is connected to the front end of the third shaft 51 located at the center of the space in the ring of the traveling motor mounting interface 321 by a spline. The third oil duct 323 communicated with the inner space of the box body is arranged at the bottom of the inner space 322 of the walking motor mounting interface ring.

As shown in fig. 6, a third shaft rear end chamber 22 is formed between the rear end of the third shaft 51 and the rear side wall of the case, a third shaft lubrication oil passage 511 is provided in the third shaft, which is axially penetrated, and a third shaft lubrication oil joint 512 is provided in the rear side wall of the case, which communicates with the third shaft rear end chamber 22. Some of the oil injected from the third shaft lubrication oil joint 512 enters the third shaft lubrication oil passage 511 from the rear end of the third shaft 51, the oil entering the third shaft lubrication oil passage 511 flows out from the front end of the third shaft 51, lubricates the bearing at the front end of the third shaft, and the oil flowing into the bottom of the space 322 in the running motor mounting interface ring flows into the space in the box through the third oil passage 323. The other part of the oil flowing out from the third shaft lubricating oil joint 512 into the third shaft rear end chamber 22 flows into the box body space through the gap between the inner ring and the outer ring of the third shaft rear end bearing, and lubricates the third shaft rear end bearing.

As shown in fig. 3 and 4, the hydraulic motor mounting interface 311 is adapted to be connected to the housing of the hydraulic motor 31, and a hydraulic motor mounting interface in-ring space 312, which is not communicated with the outside, is formed in the ring of the hydraulic motor mounting interface 311 between the tank 20 and the housing of the hydraulic motor 31. The rotating shaft of the hydraulic motor 31 is connected with the front end of the first shaft 41 positioned at the center of the space 312 in the hydraulic motor mounting interface ring through a spline.

An annular boss 21 is provided on the inner side of the front side wall of the case, a bearing for connecting with the front end of the second shaft 42 is installed in the annular boss 21, and a second shaft front end chamber 211 is formed in the annular boss 21 between the front end of the second shaft 42 and the front side wall of the case. The bottom of the second shaft front end chamber 211 is provided with a first oil passage 212 communicating with the top of the space 312 in the hydraulic motor mounting interface ring.

As shown in fig. 3 and 4, a second shaft lubrication fitting 423 communicating with the second shaft front end chamber 211 is provided on the front side wall of the case, and the second shaft lubrication fitting 423 communicates with the lubrication oil outlet of the shift control valve 90 on the case through a pipe. The second shaft 42 is provided with a second shaft lubrication oil passage 421 which is axially penetrated, and part of the lubrication oil ejected from the second shaft lubrication oil joint 423 enters the second shaft lubrication oil passage 421 and flows to the rear end of the second shaft, flows out from the rear end of the second shaft 42, flows into the inner cavity of the box body through a gap between the inner ring and the outer ring of the second shaft rear end bearing, and lubricates the second shaft rear end bearing. The lubricating oil injected from the second shaft lubricating oil joint 423 also has a part of the lubricating oil flowing into the second shaft front end chamber 211 through the gap between the inner ring and the outer ring of the second shaft 42 front end bearing to lubricate the second shaft front end bearing, and at the same time, has a part of the lubricating oil flowing into the hydraulic motor mounting interface ring inner space 312 through the first oil passage 212.

As shown in fig. 3, the case is provided with a first radial reinforcing rib 313 and a second radial reinforcing rib 314 extending obliquely upward in the ring of the hydraulic motor mounting interface 311, the outlet of the first oil passage 212 being located at the top (centrifugal end) of the space between the first radial reinforcing rib 313 and the second radial reinforcing rib 314, and the front end mounting shaft hole of the first shaft 41 being located at the bottom (centripetal end) of the space between the first radial reinforcing rib 313 and the second radial reinforcing rib 314. The lubricating oil flowing out of the first oil passage 212 flows down along the first radial reinforcing ribs 313 and the second radial reinforcing ribs 314, flows through the end portions of the first shaft 41, so that enough oil lubricates the front end bearing of the first shaft 41 and enough oil enters the first shaft lubricating oil passage 411, and the oil entering the first shaft lubricating oil passage 411 flows out of the rear end of the first shaft to lubricate the rear end bearing of the first shaft 41.

The bottom of the inner space 312 of the hydraulic motor mounting interface ring is provided with a second oil duct 315 communicated with the inner space of the box body, and the oil entering the bottom of the inner space 312 of the hydraulic motor mounting interface ring flows into the inner space of the box body through the second oil duct 315 to participate in the circulation flow of the lubricating oil in the box.

As shown in fig. 5, the rear side wall of the case 20 is provided with a first pump PTO interface 412 and a second pump PTO interface 422 respectively fitted with the first shaft 41 and the second shaft 42. The first pump PTO interface 412 is used for mounting the first pump, and the rotating shaft of the first pump is connected with the rear end of the first shaft 41 through a spline, and is driven to rotate by the first shaft 41 to work. The second pump PTO interface 422 is used for installing a second pump, and the rotating shaft of the second pump is connected with the rear end of the second shaft 42 through a spline, and is driven to rotate by the second shaft 42 to work. The first and second pumps are a steering pump and a working pump, respectively.

As shown in fig. 7, a shift oil passage and a lubrication oil passage are provided in each of the first shift shaft 61 and the second shift shaft 71. The first lubrication oil passage 611 in the first shift shaft 61 is provided with a plurality of outlets for lubricating the bearings mounted on the first shift shaft 61 and the friction pair of the low clutch 63. The first shift oil passage 612 in the first shift shaft 61 communicates with the cylinder of the low clutch 63. The oil inlet and outlet of the first gear shifting oil path 612 is located on the radial side face of the rear end of the first gear shifting shaft 61, and the oil inlet of the first lubrication oil path 611 is located on the end face of the first gear shifting shaft 61.

The second lubrication oil passage 711 in the second shift shaft 71 is provided with a plurality of outlets for lubricating the bearings mounted on the second shift shaft 71 and the friction pair of the high clutch 75. The second shift oil path 712 in the second shift shaft 71 communicates with the cylinder of the high clutch 75. The oil inlet and outlet of the second shift oil path 712 is located on a radial side surface of the rear end of the second shift shaft 71, and the oil inlet of the second lubrication oil path 711 is located on an end surface of the second shift shaft 71.

As shown in fig. 5, a first shift shaft cover 613 and a second shift shaft cover 713 are mounted on the rear side wall of the case 20. The first gear shifting shaft end cover 613 is matched with the rear end of the first gear shifting shaft 61, an oil inlet of the first lubrication oil path 611 is separated from an oil inlet and an oil outlet of the first gear shifting oil path 612, the oil inlet and the oil outlet are not communicated with each other, a first gear shifting shaft lubrication oil joint communicated with the oil inlet of the first lubrication oil path and a low-speed gear shifting joint 614 communicated with the oil inlet and the oil outlet of the first gear shifting oil path are arranged on the first gear shifting shaft end cover 613.

The second shift shaft end cover 713 is matched with the rear end of the second shift shaft 71, the oil inlet of the second lubrication oil path 711 is separated from the oil inlet and outlet of the second shift oil path 712, the oil inlet and outlet are not communicated with each other, a second shift shaft lubrication oil joint communicated with the oil inlet of the second lubrication oil path 711 and a high-speed gear shift joint 714 communicated with the oil inlet and outlet of the second shift oil path 712 are arranged on the second shift shaft end cover 713.

A shift control valve 90 is mounted on a rear side wall of the case, the shift control valve 90 is supplied with oil by a shift pump (not shown in the figure), a low gear control port of the shift control valve 90 is connected to a low gear shift joint 614 through a first shift oil pipe 92, and a high gear control port of the shift control valve 90 is connected to a high gear shift joint 714 through a second shift oil pipe 91. By controlling the operation of the shift control valve 90, the shift control valve 90 is supplied with pressurized oil from the corresponding shift control port, and the low-speed clutch 63 or the high-speed clutch 75 is engaged, so that the transmission is operated in the low-speed or the high-speed.

The first shift shaft lubricating oil joint on the first shift shaft end cover 613 comprises a first oil inlet joint 615 and a first oil outlet joint 616, the first oil inlet joint 615 and the first oil outlet joint 616 are communicated inside the first shift shaft end cover 613, part of lubricating oil entering from the first oil inlet joint 615 enters into a first lubricating oil circuit 611 in the first shift shaft 61, and the other part of oil flows out from the first oil outlet joint 616.

The second shift shaft lubricating oil joint on the second shift shaft end cover 713 includes a second oil inlet joint 715 and a second oil outlet joint 716, the second oil inlet joint 715 and the second oil outlet joint 716 are communicated inside the second shift shaft end cover 713, some of the lubricating oil entering from the second oil inlet joint 715 enters the second lubricating oil path 711 in the second shift shaft 71, and other part of the lubricating oil flows out from the second oil outlet joint 716.

The shift control valve 90 has a lubrication oil outlet for outputting lubrication oil under a certain pressure to lubricate the respective relative friction members of the transmission. As shown in fig. 5, the lubricant output port of the shift control valve 90 is connected to a second oil inlet joint 715 on the second shift shaft end cover 713 through a first oil pipe 93, a second oil outlet joint 716 on the second shift shaft end cover 713 is connected to a first oil inlet joint 615 on the first shift shaft end cover 613 through a second oil pipe 94, a first oil outlet joint 616 on the first shift shaft end cover 613 is connected to an oil inlet of a third shaft lubrication joint 512 through a third oil pipe 95, and an oil outlet of the third shaft lubrication joint 512 is connected to a second shaft lubrication joint 423 through a fourth oil pipe 96. The third shaft lubrication joint 512 is a three-way joint, some oil entering from the oil inlet of the third shaft lubrication joint 512 enters the third shaft rear end chamber 22, and the other part of oil flows out from the oil outlet of the third shaft lubrication joint 512 and enters the second shaft lubrication joint 423.

In this embodiment, the first shift shaft lubricating oil joint and the second shift shaft lubricating oil joint each include two joints for oil inlet and outlet, and when in specific implementation, the first shift shaft lubricating oil joint and the second shift shaft lubricating oil joint may also both adopt three-way joints.

In a specific embodiment, the travel drive gear system may also include a third shaft 51, a first shift shaft assembly, a second shift shaft assembly, and a fourth shaft 81 connected by a gear mesh transmission, as shown in fig. 8, wherein:

a second driving gear 52 is fixedly mounted on the third shaft 51;

the first gear shift shaft assembly comprises a first gear shift shaft 61, a second driven gear 62 and a high-speed gear driving gear 65 which are fixedly arranged on the first gear shift shaft 61 and meshed with the second driving gear 52, a low-speed gear clutch 63 with a driving end connected with the first gear shift shaft 61 through a spline, and a low-speed gear driving gear 64 which is arranged on the first gear shift shaft 61 and connected with a driven end of the low-speed gear clutch 63 through a spline;

the second gear shifting shaft assembly comprises a second gear shifting shaft 71, a high-speed gear clutch 75, a high-speed gear driven gear 74 and a low-speed gear driven gear 76, wherein the driven end of the high-speed gear clutch 75 is connected with the second gear shifting shaft 71 through a spline, the high-speed gear driven gear 74 is arranged on the second gear shifting shaft 71 and connected with the driving end of the high-speed gear clutch 75 through a spline, the low-speed gear driven gear 76 is fixedly arranged on the second gear shifting shaft 71, the low-speed gear driven gear 76 is meshed with the low-speed gear driving gear 64, and the high-speed gear driven gear 74 is meshed with the high-speed gear driving gear 65;

the fourth shaft 81 is fixedly provided with a third driven gear 82 which meshes with the low-gear driven gear 76.

In the present invention, the oil path connection between the lubrication oil output port of the shift control valve 90 and the lubrication oil connectors at the ends of the respective shafts may be directly connected, that is, four ports are provided at the lubrication oil output port of the shift control valve 90, each port is connected to one oil pipe, and the four oil pipes are correspondingly connected to the second shaft lubrication connector 423, the third shaft lubrication connector 512, the first shift shaft lubrication connector, and the second shift shaft lubrication connector.

The invention realizes the two-in-one layout of the transfer case and the gearbox, has simplified structure, reduced parts and components, reduced cost, and the motor drive can realize stepless speed change or reverse operation, so that the fixed-axis gearbox realizes four gears under the condition of two clutches, and has simple and convenient operation and simple control; through the design of forced lubrication and oil duct, fully lubricate the gear shafting, improve bearing life-span.

Claims (10)

1. The double-motor fixed-shaft type gearbox is characterized by comprising an oil pump driving gear shaft system and a traveling driving gear shaft system which are arranged in the same box body, wherein the oil pump driving gear shaft system comprises a first shaft and a second shaft which are connected through gear meshing, a hydraulic motor mounting interface matched with the first shaft is arranged on the front side wall of the box body, and a first pump PTO interface respectively matched with the first shaft and the second shaft are arranged on the rear side wall of the box body; the novel hydraulic oil tank is characterized in that a first shaft lubricating oil passage and a second shaft lubricating oil passage which are axially communicated are respectively arranged in the first shaft and the second shaft, the second shaft is arranged above the first shaft, a first oil passage which is communicated with the top of a space in a hydraulic motor mounting interface ring is arranged at the bottom of a cavity at the front end of the second shaft, a second oil passage which is communicated with the space in the box is arranged at the bottom of the space in the hydraulic motor mounting interface ring, a second shaft lubricating joint which is communicated with the cavity at the front end of the second shaft is arranged on the front side wall of the box, and the second shaft lubricating joint is communicated with a lubricating oil outlet of a speed change control valve on the box through a pipeline.

2. The dual-motor fixed-shaft gearbox of claim 1, wherein the box body is provided with two radial reinforcing ribs extending obliquely upwards in the hydraulic motor mounting interface ring, an outlet of the first oil duct is positioned at the top of a space between the two radial reinforcing ribs, and a front-end mounting shaft hole of the first shaft is positioned at the bottom of the space between the two radial reinforcing ribs.

3. The dual-motor fixed-shaft gearbox according to claim 1 or 2, characterized in that the traveling driving gear shaft system comprises a third shaft, a first gear shifting shaft assembly, a second gear shifting shaft assembly and a fourth shaft which are connected through gear meshing transmission, wherein the front end and the rear end of the fourth shaft are connected with output connecting flanges; the novel gearbox is characterized in that a travelling motor installation interface matched with a third shaft is arranged on the front side wall of the gearbox body, a third shaft lubricating oil passage which is axially communicated is arranged in the third shaft, a third oil passage which is communicated with the space in the gearbox body is arranged at the bottom of the space in the travelling motor installation interface ring, a third shaft lubricating oil joint which is communicated with a third shaft rear end chamber is arranged on the rear side wall of the gearbox body, and the third shaft lubricating oil joint is communicated with a lubricating oil outlet of a speed change control valve on the gearbox body through a pipeline.

4. A twin-motor fixed-shaft gearbox according to claim 3, characterised in that the third shaft (51) is fixedly fitted with a second driving gear (52);

the first gear shifting shaft assembly comprises a first gear shifting shaft (61), a second driven gear (62) fixedly arranged on the first gear shifting shaft (61) and meshed with the second driving gear (52), a low-speed gear clutch (63) with a driving end connected with the first gear shifting shaft (61) through a spline, and a low-speed gear driving gear (64) arranged on the first gear shifting shaft (61) and connected with a driven end of the low-speed gear clutch (63) through the spline;

the second gear shifting shaft assembly comprises a second gear shifting shaft (71), a high-speed gear clutch (75) with a driven end connected with the second gear shifting shaft (71) through a spline, a high-speed gear driven gear (74) mounted on the second gear shifting shaft (71) and connected with a driving end of the high-speed gear clutch (75) through a spline, a low-speed gear driven gear (72) fixedly mounted on the second gear shifting shaft (71) and a third driving gear (73), wherein the low-speed gear driven gear (72) is meshed with the low-speed gear driving gear (64), and the high-speed gear driven gear (74) is meshed with the high-speed gear driving gear (62);

a third slave gear (82) which meshes with the third drive gear (73) is fixedly mounted on the fourth shaft (81).

5. A twin-motor fixed-shaft gearbox according to claim 3, characterised in that the third shaft (51) is fixedly fitted with a second driving gear (52);

the first gear shifting shaft assembly comprises a first gear shifting shaft (61), a second driven gear (62) and a high-speed gear driving gear (65) which are fixedly arranged on the first gear shifting shaft (61) and meshed with the second driving gear (52), a low-speed gear clutch (63) with a driving end connected with the first gear shifting shaft (61) through a spline, and a low-speed gear driving gear (64) which is arranged on the first gear shifting shaft (61) and connected with a driven end of the low-speed gear clutch (63) through a spline;

the second gear shifting shaft assembly comprises a second gear shifting shaft (71), a high-speed gear clutch (75) with a driven end connected with the second gear shifting shaft (71) through a spline, a high-speed gear driven gear (74) arranged on the second gear shifting shaft (71) and connected with a driving end of the high-speed gear clutch (75) through the spline, and a low-speed gear driven gear (76) fixedly arranged on the second gear shifting shaft (71), wherein the low-speed gear driven gear (76) is meshed with the low-speed gear driving gear (64), and the high-speed gear driven gear (74) is meshed with the high-speed gear driving gear (65);

a third driven gear (82) meshed with the low-gear driven gear (76) is fixedly arranged on the fourth shaft (81).

6. The dual-motor fixed shaft type gearbox according to claim 4 or 5, wherein a first gear shifting shaft end cover and a second gear shifting shaft end cover are mounted on the rear side wall of the gearbox body, the first gear shifting shaft end cover and the second gear shifting shaft end cover are respectively provided with a gear shifting shaft lubricating oil joint communicated with a lubricating oil outlet of a speed changing control valve through a pipeline, and each gear shifting shaft lubricating oil joint is communicated with a lubricating oil duct on the gear shifting shaft through an oil duct between the rear end of the corresponding gear shifting shaft and the gear shifting shaft end cover.

7. The dual motor fixed shaft transmission according to claim 4 or 5, wherein each of the lubricating oil connectors is directly connected to a lubricating oil outlet of the shift control valve through an oil pipe.

8. The dual-motor fixed-shaft gearbox according to claim 4 or 5, wherein the lubricating oil outlet of the speed change operating valve on the gearbox body is connected with the oil inlet of the gear shift shaft lubricating oil joint on the second gear shift shaft end cover through a first oil pipe, the oil outlet of the gear shift shaft lubricating oil joint on the second gear shift shaft end cover is connected with the oil inlet of the gear shift shaft lubricating oil joint on the first gear shift shaft end cover through a second oil pipe, the oil outlet of the gear shift shaft lubricating oil joint on the first gear shift shaft end cover is connected with the oil inlet interface of the third shaft lubricating oil joint through a third oil pipe, and the oil outlet interface of the third shaft lubricating oil joint is connected with the second shaft lubricating oil joint through a fourth oil pipe.

9. The dual-motor fixed-shaft type gearbox according to claim 4 or 5, wherein the second shaft and the third shaft are arranged at left and right intervals at an upper portion of the gearbox, the fourth shaft is arranged at a lower portion of the gearbox, and the first shaft, the first shift shaft and the second shift shaft are arranged at a middle portion of the gearbox.

10. An electric loader characterized by comprising a dual motor fixed shaft gearbox according to any of claims 1 to 9.

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