阅读说明：本技术 多模式输出一体泵马达及其应用方法 (Multi-mode output integrated pump motor and application method thereof ) 是由 肖名涛 陈文凯 周志 于 2019-10-08 设计创作，主要内容包括：本发明公开了一种多模式输出一体泵马达及其应用方法,一体泵马达包括：输入轴组件,输入轴上安装输入轴主动齿轮；输出轴组件,输出轴上空套安装输出轴从动齿轮、输出轴从动齿轮结合齿,输出轴从动齿轮与输入轴主动齿轮啮合,输出轴上安装花键毂；行星齿轮机构,包括太阳轮、齿圈和行星架,行星架上设行星齿轮,太阳轮与行星齿轮啮合,行星齿轮与齿圈啮合；液压输出轴上固装液压输出轴齿轮,其与齿圈外齿轮啮合,设液压输出轴齿轮结合齿；结合套可移动安装在花键毂外侧；还包括一体式液压泵马达和换档控制装置。该一体泵马达解决了现有的一体泵马达液压系统效率低,燃油经济性差的问题。(The invention discloses a multi-mode output integrated pump motor and an application method thereof, wherein the integrated pump motor comprises: the input shaft assembly is provided with an input shaft driving gear; an output shaft driven gear and an output shaft driven gear combination tooth are mounted on an output shaft in a hollow sleeve mode, the output shaft driven gear is meshed with an input shaft driving gear, and a spline hub is mounted on the output shaft; the planetary gear mechanism comprises a sun gear, a gear ring and a planet carrier, wherein the planet carrier is provided with a planetary gear, the sun gear is meshed with the planetary gear, and the planetary gear is meshed with the gear ring; a hydraulic output shaft gear is fixedly mounted on the hydraulic output shaft, is meshed with the gear ring external gear and is provided with a hydraulic output shaft gear combination tooth; the combining sleeve is movably arranged on the outer side of the spline hub; an integrated hydraulic pump motor and shift control device are also included. The integrated pump motor solves the problems that an existing integrated pump motor hydraulic system is low in efficiency and poor in fuel economy.)

1. A multi-mode output integrated pump motor, comprising:

the input shaft assembly (10) comprises an input shaft (11), and an input shaft driving gear (12) is fixedly mounted on the input shaft (11);

the output shaft assembly (20) comprises an output shaft (21), an output shaft driven gear (22) is mounted on the output shaft (21) in a sleeved mode, output shaft driven gear combination teeth (221) are arranged on the output shaft driven gear (22), the output shaft driven gear (22) is meshed with the input shaft driving gear (12), and a spline hub (23) is fixedly mounted on the output shaft (21);

the planetary gear mechanism (30) comprises a sun gear (31), a gear ring (32) and a planet carrier (33), wherein the planet carrier (33) is provided with a plurality of planet gears (331), the sun gear (31) is meshed with the planet gears (331), the planet gears (331) are meshed with the gear ring (32), the sun gear (31) is fixedly installed on the input shaft (11), a gear ring outer gear (321) is arranged on the outer side of the gear ring (32), and a planet carrier gear (332) is arranged on the outer side of the planet carrier (33);

the hydraulic output shaft (40), a hydraulic output shaft gear (41) is fixedly mounted on the hydraulic output shaft (40), the hydraulic output shaft gear (41) is meshed with the gear ring outer gear (321), and a hydraulic output shaft gear combination tooth (411) is arranged on the hydraulic output shaft gear (41);

a coupling sleeve (50), wherein the coupling sleeve (50) is movably mounted on the outer side of the spline hub (23), the coupling sleeve (50) can be respectively internally meshed with the output shaft driven gear coupling teeth (221) and the hydraulic output shaft gear coupling teeth (411), a coupling sleeve driven gear (51) is arranged on the outer side of the coupling sleeve (50), and the coupling sleeve driven gear (51) can be externally meshed with the planet carrier gear (332);

an integrated hydraulic pump motor (60), the output end of the integrated hydraulic pump motor (60) being connected with the hydraulic output shaft (40);

and a shift control device (70), wherein the shift control device (70) is connected with the integrated hydraulic pump motor (60) and the coupling sleeve (50), and the shift control device (70) drives the coupling sleeve (50) to move and controls the integrated hydraulic pump motor (60) so as to realize gear switching between multi-mode output.

2. The multi-mode output integral pump motor of claim 1, wherein the integral hydraulic pump motor (60) comprises:

a continuously variable transmission (61), the continuously variable transmission (61) including a variable pump (611), a control valve (612), and a fixed-displacement motor (613), the variable pump (611) being connected to the control valve (612) via an oil path, the control valve (612) being connected to the fixed-displacement motor (613) via an oil path, and an output end of the fixed-displacement motor (613) being connected to the hydraulic output shaft (40);

and the low-pressure oil circuit system (62), the low-pressure oil circuit system (62) is connected with the stepless speed change device (61) and is used for supplementing hydraulic oil for the stepless speed change device (61) and providing a power source for the control valve (612).

3. The multi-mode output integrated pump motor according to claim 2, wherein the low-pressure oil path system (62) comprises an oil tank (621), a low-pressure overflow valve (622), a fixed displacement pump (623) and a filter (624), the low-pressure overflow valve (622) is respectively connected with the oil tank (621), the fixed displacement pump (623), the variable displacement pump (611) and the control valve (612) through oil paths, and the filter (624) is mounted on the fixed displacement pump (623).

4. A multi-mode output integrated pump motor according to claim 3, wherein a flushing valve (614) is provided between an oil passage connecting the low pressure relief valve (622) and the control valve (612) and an oil passage connecting the fixed displacement pump (623) and the control valve (612).

5. The multi-mode output integral pump motor of claim 2, further comprising:

the transmission device comprises a box body (80), wherein the input shaft assembly (10), the output shaft assembly (20), the planetary gear mechanism (30), the hydraulic output shaft (40), the combination sleeve (50) and the integrated hydraulic pump motor (60) are arranged in the box body (80), the input shaft (11) and the output shaft (21) are mounted on the box body (80) through bearings, and the gear shifting control device (70) is arranged on the box body (80).

6. The multi-mode output integrated pump motor according to claim 5, wherein the shift control means (70) includes:

the gear groove is formed in the box body (80), the gear groove comprises a hydraulic stepless gear sliding groove (711), a combined gear sliding groove (712) and a mechanical gear sliding groove (713), and the hydraulic stepless gear sliding groove (711) and the combined gear sliding groove (712) are communicated with the mechanical gear sliding groove (713);

and a shift lever (72) disposed in the shift groove, wherein the shift lever (72) is slidable in the hydraulic stepless slide groove (711), the combination slide groove (712), and the mechanical slide groove (713), and the shift lever (72) is connected to the coupling sleeve (50) and is configured to move the coupling sleeve (50) by sliding the shift lever (72).

7. The pump motor of claim 6, wherein a solenoid valve switch (73) is disposed at an intermediate position where the combination gear slide groove (712) and the mechanical gear slide groove (713) are communicated, and the solenoid valve switch (73) is connected to the control valve (612).

8. The multi-mode output integrated pump motor according to claim 6, wherein a one-way lock shift valve (74) is provided in the mechanical shift gate (713) near the hydraulic stepless shift gate (711) and near the combination shift gate (712), respectively.

9. Application method of a multi-mode output integral pump motor according to any one of claims 6 to 8,

when a hydraulic stepless gear is adopted, the shift lever (72) is arranged in a hydraulic stepless gear sliding groove (711), and the combination sleeve (50) moves under the driving of the shift lever (72) and is internally meshed with the hydraulic output shaft gear combination teeth (411); the power of the integrated hydraulic pump motor (60) is transmitted to the hydraulic output shaft (40) through the fixed displacement motor (613), and then transmitted to the output shaft (21) through the hydraulic output shaft gear (41), the hydraulic output shaft gear combination teeth (411), the combination sleeve (50) and the spline hub (23) in sequence;

when a combined gear is adopted, a shift lever (72) is placed in a combined gear sliding groove (712), a combination sleeve (50) stops at a middle position, and a combination sleeve driven gear (51) is meshed with a planet carrier gear (332); the first path of power is transmitted to the output shaft (21) by the input shaft (11) through the sun gear (31), the planetary gear (331), the planet carrier (33), the planet carrier gear (332), the joint sleeve driven gear (51), the joint sleeve (50) and the spline hub (23) in sequence; the second power is transmitted to the output shaft (21) by the hydraulic output shaft (40) through the hydraulic output shaft gear (41), the gear ring external gear (321), the gear ring (32), the planetary gear (331), the planet carrier (33), the planet carrier gear (332), the coupling sleeve driven gear (51), the coupling sleeve (50) and the spline hub (23) in sequence; the two paths of power are combined to form a mechanical first gear and a first gear stepless adjusting gear;

when a mechanical second gear is adopted, a shift lever (72) is placed in a mechanical gear sliding groove (713), a combination sleeve (50) is meshed with an output shaft driven gear combination tooth (221), and power is transmitted to an output shaft (21) from an input shaft (11) through an input shaft driving gear (12), an output shaft driven gear (22), an output shaft driven gear combination tooth (221), the combination sleeve (50) and a spline hub (23) in sequence.

Technical Field

The invention relates to the technical field of hydraulic elements, in particular to a multi-mode output integrated pump motor and an application method thereof.

Background

The integral pump motor is a hydraulic pump which combines a variable hydraulic pump and a fixed-displacement motor together and can steplessly adjust the rotating speed of an output motor. The integrated pump motor is widely applied to the fields of engineering machinery, vehicles, agricultural machinery and the like. The range of the rotation speed regulation of the integrated pump motor is small, so that the integrated pump motor can be suitable for vehicles running at low speed, such as engineering machinery, agricultural vehicles, agricultural mechanical equipment and the like.

In the application of the engineering machinery, the driving travelling is light in specific gravity of the operation of the engineering machinery, so that the integrated pump motor is very suitable for the application. However, in the field of agricultural machinery, taking a crawler tractor as an example for dragging a plough to plough, almost all power is consumed on a running system when the crawler tractor drags the plough to plough, and if the crawler tractor is driven by an integrated pump motor, the efficiency of a hydraulic system is low, and the fuel economy is poor.

In view of the above problems in the related art, no effective solution has been proposed at present.

Disclosure of Invention

The invention mainly aims to provide a multi-mode output integrated pump motor and an application method thereof, and aims to solve the problems that when the integrated pump motor in the prior art is applied to agricultural machinery, a hydraulic system is low in efficiency and poor in fuel economy.

To achieve the above object, according to one aspect of the present invention, there is provided a multi-mode output integrated pump motor including:

the input shaft assembly comprises an input shaft, and an input shaft driving gear is fixedly mounted on the input shaft;

the output shaft assembly comprises an output shaft, an output shaft driven gear is sleeved on the output shaft in an empty mode, output shaft driven gear combination teeth are arranged on the output shaft driven gear, the output shaft driven gear is meshed with the input shaft driving gear, and a spline hub is fixedly arranged on the output shaft;

the planetary gear mechanism comprises a sun gear, a gear ring and a planet carrier, wherein the planet carrier is provided with a plurality of planet gears, the sun gear is meshed with the planet gears, the planet gears are meshed with the gear ring, the sun gear is fixedly arranged on the input shaft, the outer side of the gear ring is provided with a gear ring outer gear, and the outer side of the planet carrier is provided with a planet carrier gear;

the hydraulic output shaft is fixedly provided with a hydraulic output shaft gear which is meshed with the gear ring external gear, and the hydraulic output shaft gear is provided with a hydraulic output shaft gear combination tooth;

the combination sleeve is movably arranged on the outer side of the spline hub, the combination sleeve can be respectively meshed with the combination teeth of the output shaft driven gear and the combination teeth of the hydraulic output shaft gear in an internal manner, the combination sleeve driven gear is arranged on the outer side of the combination sleeve, and the combination sleeve driven gear can be meshed with the planet carrier gear in an external manner;

the output end of the integrated hydraulic pump motor is connected with the hydraulic output shaft;

and the gear shifting control device is connected with the integrated hydraulic pump motor and the coupling sleeve, and the gear shifting control device drives the coupling sleeve to move and controls the integrated hydraulic pump motor so as to realize gear shifting among multi-mode output.

Further, the integrated hydraulic pump motor includes:

the stepless speed change device comprises a variable pump, a control valve and a quantitative motor, wherein the variable pump is connected with the control valve through an oil way, the control valve is connected with the quantitative motor through the oil way, and the output end of the quantitative motor is connected with a hydraulic output shaft;

and the low-pressure oil way system is connected with the stepless speed change device and is used for supplementing hydraulic oil for the stepless speed change device and providing a power source for the control valve.

Further, the low-pressure oil circuit system comprises an oil tank, a low-pressure overflow valve, a constant delivery pump and a filter, wherein the low-pressure overflow valve is respectively connected with the oil tank, the constant delivery pump, the variable delivery pump and the control valve through oil circuits, and the filter is installed on the constant delivery pump.

Furthermore, a flushing valve is arranged between an oil way for connecting the low-pressure overflow valve and the control valve and an oil way for connecting the constant delivery pump and the control valve.

Further, still include:

the box, input shaft subassembly, output shaft subassembly, planetary gear mechanism, hydraulic output shaft, combination cover and integral type hydraulic pump motor all set up in the box, and input shaft and output shaft all install on the box through the bearing, and shift control device locates on the box.

Further, the shift control device includes:

the gear groove is formed in the box body and comprises a hydraulic stepless gear sliding groove, a combined gear sliding groove and a mechanical gear sliding groove, and the hydraulic stepless gear sliding groove and the combined gear sliding groove are communicated with the mechanical gear sliding groove;

the gear shifting rod is arranged in the gear groove, can slide in the hydraulic stepless gear sliding groove, the combined gear sliding groove and the mechanical gear sliding groove, is connected with the combining sleeve, and can drive the combining sleeve to move through sliding the gear shifting rod.

Furthermore, a solenoid valve switch is arranged in the middle of the communication position of the combined gear sliding chute and the mechanical gear sliding chute and connected with the control valve.

Furthermore, a one-way lock is respectively arranged at the position close to the hydraulic stepless sliding chute and the position close to the combined sliding chute in the mechanical shifting sliding chute.

According to another aspect of the present invention, there is provided an application method of the multi-mode output integral pump motor as described above:

when the hydraulic stepless gear is adopted, the shift lever is arranged in the hydraulic stepless gear sliding chute, and the combination sleeve moves under the driving of the shift lever and is internally meshed with the combination teeth of the hydraulic output shaft gear; the power of the integrated hydraulic pump motor is transmitted to the hydraulic output shaft through the quantitative motor and then transmitted to the output shaft through the hydraulic output shaft gear, the hydraulic output shaft gear combination teeth, the combination sleeve and the spline hub in sequence;

when the combined gear is adopted, the shift lever is arranged in the combined gear sliding groove, the combination sleeve stops at the middle position, and the driven gear of the combination sleeve is meshed with the planet carrier gear; the first path of power is transmitted to the output shaft by the input shaft through the sun gear, the planetary gear, the planet carrier gear, the driven gear of the combination sleeve, the combination sleeve and the spline hub in sequence; the second path of power is transmitted to the output shaft by the hydraulic output shaft through a hydraulic output shaft gear, a gear ring external gear, a gear ring, a planetary gear, a planet carrier gear, a coupling sleeve driven gear, a coupling sleeve and a spline hub in sequence; the two paths of power are combined to form a mechanical first gear and a first gear stepless adjusting gear;

when a mechanical second gear is adopted, the shift lever is arranged in the mechanical gear sliding groove, the combination sleeve is internally meshed with the combination teeth of the output shaft driven gear, and power is transmitted to the output shaft from the input shaft through the input shaft driving gear, the output shaft driven gear combination teeth, the combination sleeve and the spline hub in sequence.

By applying the technical scheme of the invention, the gear-shifting control device is structurally arranged among the input shaft assembly, the output shaft assembly, the planetary gear mechanism, the hydraulic output shaft, the combination sleeve, the integrated hydraulic pump motor and the gear-shifting control device; the mechanical second gear (namely, the mechanical high gear) is formed by the constant meshing transmission of the input shaft driving gear and the output shaft driven gear; a hydraulic output shaft gear, a planetary gear mechanism, a coupling sleeve driven gear, a coupling sleeve and a spline hub form a combined gear (namely a mechanical first gear and a first gear stepless adjusting gear); the hydraulic stepless gear is composed of a hydraulic output shaft gear, a hydraulic output shaft gear combination tooth, a combination sleeve and a spline hub; the multi-mode output integrated pump motor is formed, and multi-mode output of mechanical gears, hydraulic stepless gears and mechanical and hydraulic combined gears of the integrated pump motor is realized. The multi-mode output integrated pump motor can be switched among various output modes through the gear shifting control device according to actual use conditions, and the problems that an existing integrated pump motor hydraulic system is low in efficiency and poor in fuel economy are solved.

The present invention will be described in further detail below with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic diagram of the overall structure of a multi-mode output integrated pump motor according to an embodiment of the present invention.

Fig. 2 is a schematic diagram of a multi-mode output integrated pump motor in a hydraulic stepless gear according to an embodiment of the invention.

FIG. 3 is a schematic block diagram of a multi-mode output integral pump motor in a combination gear according to an embodiment of the present invention.

Fig. 4 is a schematic diagram of a multi-mode output integrated pump motor in a mechanical second gear according to an embodiment of the present invention.

Fig. 5 is a schematic diagram of the structure of the integrated hydraulic pump motor in the multi-mode output integrated pump motor according to the embodiment of the invention.

FIG. 6 is a schematic block diagram of a shift control device in a multi-mode output integral pump motor according to an embodiment of the present invention.

Wherein the figures include the following reference numerals:

10. an input shaft assembly; 11. an input shaft; 12. an input shaft drive gear; 20. an output shaft assembly; 21. an output shaft; 22. an output shaft driven gear; 23. a splined hub; 30. a planetary gear mechanism; 31. a sun gear; 32. a ring gear; 33. a planet carrier; 40. a hydraulic output shaft; 41. a hydraulic output shaft gear; 50. a coupling sleeve; 51. a coupling sleeve driven gear; 60. an integral hydraulic pump motor; 61. a continuously variable transmission; 62. a low pressure oil line system; 70. a shift control device; 72. a shift lever; 73. a solenoid valve switch; 74. a one-way lock shift valve; 80. a box body; 221. the output shaft driven gear is combined with teeth; 331. a planetary gear; 321. a ring gear external gear; 332. a planet carrier gear; 411. the hydraulic output shaft gear is combined with teeth; 611. a variable displacement pump; 612. a control valve; 613. a quantitative motor; 614. a flush valve; 621. an oil tank; 622. a low pressure relief valve; 623. a constant delivery pump; 624. a filter; 711. a hydraulic stepless shift chute; 712. a combined gear sliding chute; 713. a mechanical gear sliding chute; 721. a forward gear; 722. neutral position; 723. a reverse gear; 724. a reduction gear; 725. an acceleration gear; 726. first gear; 727. and (4) second gear.

Detailed Description

In order to facilitate an understanding of the invention, the invention will be described more fully and in detail below with reference to the accompanying drawings and preferred embodiments, but the scope of the invention is not limited to the specific embodiments below. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The use of "first," "second," and similar terms in the description and in the claims of the present application do not denote any order, quantity, or importance, but rather the intention is to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships are changed accordingly.

The multi-mode output integrated pump motor provided by the embodiment of the invention can be applied to various engineering machines, vehicles and agricultural machines, and is particularly suitable for the agricultural machines with power mainly consumed on a running system. The structural schematic diagram of the multi-mode output integrated pump motor is shown in fig. 1 to 6, and as can be seen from the figure, the motor mainly comprises: an input shaft assembly 10, an output shaft assembly 20, a planetary gear mechanism 30, a hydraulic output shaft 40, a coupling sleeve 50, an integrated hydraulic pump motor 60, and a shift control device 70. The input shaft assembly 10 comprises an input shaft 11, and an input shaft driving gear 12 is mounted on the input shaft 11 through a spline; the output shaft assembly 20 comprises an output shaft 21, an output shaft driven gear 22 is mounted on the output shaft 21 in a hollow sleeved mode, output shaft driven gear combination teeth 221 are arranged on the output shaft driven gear 22, the output shaft driven gear 22 is meshed with the input shaft driving gear 12, and a spline hub 23 is mounted on the output shaft 21 through a spline; the planetary gear mechanism 30 comprises a sun gear 31, a gear ring 32 and a planet carrier 33, the planet carrier 33 is mounted on the input shaft 11 in an empty way, the planet carrier 33 is provided with a plurality of planet gears 331, the sun gear 31 is meshed with the planet gears 331, the planet gears 331 are meshed with the gear ring 32, the sun gear 31 is mounted on the input shaft 11 through splines, the gear ring 32 is provided with an outer gear 321 on the outer side, and the planet carrier 33 is provided with a planet carrier gear 332 on the outer side; a hydraulic output shaft gear 41 is arranged on the hydraulic output shaft 40 through a spline, the hydraulic output shaft gear 41 is normally meshed with the gear ring outer gear 321, and a hydraulic output shaft gear combination tooth 411 is arranged on the hydraulic output shaft gear 41; the coupling sleeve 50 is movably mounted on the outer side of the spline hub 23, the coupling sleeve 50 can be internally meshed with the output shaft driven gear coupling teeth 221 and the hydraulic output shaft gear coupling teeth 411 respectively, a coupling sleeve driven gear 51 is arranged on the outer side of the coupling sleeve 50, and the coupling sleeve driven gear 51 can be externally meshed with the planet carrier gear 332; the output end of the integrated hydraulic pump motor 60 is connected with the hydraulic output shaft 40, and the power of the integrated hydraulic pump motor is transmitted to the hydraulic output shaft 40; the shift control device 70 is connected to the integrated hydraulic pump motor 60 and the coupling sleeve 50, and the shift control device 70 controls the integrated hydraulic pump motor 60 by driving the coupling sleeve 50 to move, thereby realizing shift switching between multi-mode outputs.

The multi-mode output integrated pump motor is structurally arranged among the input shaft assembly 10, the output shaft assembly 20, the planetary gear mechanism 30, the hydraulic output shaft 40, the coupling sleeve 50, the integrated hydraulic pump motor 60 and the gear shifting control device 70; the input shaft driving gear 12 and the output shaft driven gear 22 are in constant mesh transmission to form a mechanical second gear (namely, a mechanical high gear); a hydraulic output shaft gear 41, a planetary gear mechanism 30, a coupling sleeve driven gear 51, a coupling sleeve 50 and a spline hub 23 form a combined gear (namely a mechanical first gear and a first gear stepless adjusting gear); the hydraulic stepless gear is composed of a hydraulic output shaft gear 41, a hydraulic output shaft gear combination tooth 411, a combination sleeve 50 and a spline hub 23; the multi-mode output integrated pump motor is formed, and multi-mode output of mechanical gears, hydraulic stepless gears and mechanical and hydraulic combined gears of the integrated pump motor is realized. The multi-mode output integrated pump motor can be switched among a plurality of output modes through the gear shifting control device 70 according to actual use conditions, and the problems that an existing integrated pump motor hydraulic system is low in efficiency and poor in fuel economy are solved.

Specifically, referring to fig. 1 and 5, in the present embodiment, the integrated hydraulic pump motor 60 includes: a continuously variable transmission 61 and a low-pressure oil passage system 62. The stepless speed change device 61 comprises a variable pump 611, a control valve 612 and a fixed-displacement motor 613, wherein the variable pump 611 is connected with the control valve 612 through an oil path, the control valve 612 is connected with the fixed-displacement motor 613 through an oil path, and the output end of the fixed-displacement motor 613 is connected with the hydraulic output shaft 40; the control valve 612 switches an internal oil path of the integrated hydraulic pump motor 60 under the control of the shift control device 70, thereby achieving gear change. The low-pressure oil passage system 62 is connected to the continuously variable transmission 61, and is used to supplement hydraulic oil to the continuously variable transmission 61 and supply power to the control valve 612.

Further, referring to fig. 1 and 5, in the present embodiment, the low-pressure oil passage system 62 includes an oil tank 621, a low-pressure relief valve 622, a dosing pump 623, and a filter 624. The low-pressure relief valve 622 is connected to the oil tank 621, the fixed displacement pump 623, the variable displacement pump 611, and the control valve 612 through oil passages, and the filter 624 is mounted on the fixed displacement pump 623. A flushing valve 614 is also arranged between the oil passage connecting the low-pressure overflow valve 622 and the control valve 612 and the oil passage connecting the dosing pump 623 and the control valve 612. The flushing valve 614 enables the oil working in the integral pump motor to form overflow exchange with the oil in the oil tank 621 under the action of the low-pressure oil supplementing oil path, so as to prevent the internal oil path from being high in temperature. The fixed displacement pump 623 and the variable displacement pump 611 are spline-mounted on one end of the input shaft 11, and the variable displacement pump 611 is coaxial with the fixed displacement pump 623.

Referring to fig. 1, in the present embodiment, the multi-mode output integrated pump motor further includes a case 80, and the input shaft assembly 10, the output shaft assembly 20, the planetary gear mechanism 30, the hydraulic output shaft 40, the coupling sleeve 50, and the integrated hydraulic pump motor 60 are all disposed in the case 80, and the input shaft 11 and the output shaft 21 are both mounted on the case 80 through bearings, and the shift control device 70 is also disposed on the case 80. Therefore, the multi-mode output integrated pump motor is more compact in structure.

Referring to fig. 6, in the present embodiment, the shift control device 70 includes a shift groove and a shift lever 72. The gear groove is formed in the box body 80 and comprises a hydraulic stepless gear sliding groove 711, a combined gear sliding groove 712 and a mechanical gear sliding groove 713, and the hydraulic stepless gear sliding groove 711 and the combined gear sliding groove 712 are communicated with the mechanical gear sliding groove 713; the shift lever 72 is disposed in the shift groove, the shift lever 72 is slidable in the hydraulic stepless slide groove 711, the combination slide groove 712, and the mechanical slide groove 713, the shift lever 72 is connected to the coupling sleeve 50, and the coupling sleeve 50 is movable by sliding the shift lever 72. Gear identification is also included in the shift control device 70, which is primarily a forward gear 721, a neutral gear 722, a reverse gear 723, a deceleration gear 724, an acceleration gear 725, a first gear 726, and a second gear 727.

Further, in the present embodiment, a solenoid valve switch 73 is further disposed at an intermediate position where the combination shift gate 712 communicates with the mechanical shift gate 713, and the solenoid valve switch 73 is connected to the control valve 612. The control valve 612 is controlled by a solenoid valve switch 73 and a shift lever 72. A one-way lock shift valve 74 is provided in the mechanical range link 713 near the hydraulic stepless link 711 and near the combination link 712, respectively. Specifically, the one-way lock shift valve 74 has a right triangle shape in cross section, and the hypotenuse thereof is disposed away from the hydraulic stepless speed change runner 711 and the combination speed change runner 712. The shift lever 72 does not need to operate the clutch when moving up and down in the hydraulic stepless speed slide groove 711 and the combined speed slide groove 712, and needs to operate the clutch when moving left and right in the mechanical speed slide groove 713; in order to prevent the accidental engagement, two one-way lock-up shift valves 74 are arranged in the mechanical shift gate 713, when the shift lever 72 is moved from right to left in the mechanical shift gate 713, the one-way lock-up shift valve 74 limits the free movement of the shift lever 72, and the one-way lock-up shift valve 74 needs to be opened by operating clutch engagement; when the shift lever 72 is moved from left to right in the mechanical stage link 713, the one-way lock-up shift valve 74 does not restrict the free movement of the shift lever 72, and there is no need to operate the clutch.

The working principle and the using method of the multi-mode output integrated pump motor of the embodiment are as follows:

when the hydraulic stepless gear is adopted, referring to fig. 2 and 6, the shift lever 72 is placed in the hydraulic stepless gear sliding groove 711, and the combination sleeve 50 moves rightwards under the driving of the shift lever 72 and is meshed with the hydraulic output shaft gear combination teeth 411; the shift lever 72 moves up and down in the hydraulic stepless link 711, so that the swash plate angle of the variable displacement pump 611 changes, and the forward speed 721, the neutral speed 722, and the reverse speed 723 change are realized. The shift lever 72 is in the forward 721 position of fig. 6, hydraulic stepless forward maximum; the shift lever 72 is in the reverse position 723 shown in fig. 6, and is a hydraulic stepless reverse maximum position; the shift lever 72 is in the neutral 722 position of fig. 6, which is a hydraulic system neutral. When the shift lever 72 is between the forward gear 721 and the neutral gear 722, a stepless forward gear is provided; when shift lever 72 is between reverse range 723 and neutral 722, it is a stepless reverse range. In this mode, the power of the integrated hydraulic pump motor 60 is transmitted to the hydraulic output shaft 40 via the fixed displacement motor 613, and then transmitted to the output shaft 21 via the hydraulic output shaft gear 41, the hydraulic output shaft gear coupling teeth 411, the coupling sleeve 50, and the spline hub 23 in this order.

When the combined gear is adopted, referring to fig. 3 and 6, the shift lever 72 is placed in the combined gear chute 712, the coupling sleeve 50 is stopped at the middle position, the coupling sleeve driven gear 51 is meshed with the planet carrier gear 332, and the multi-mode output integrated pump motor outputs the combined gear. When the shift lever 72 moves from the hydraulic stepless speed link 711 to the combination speed link 712, the shift lever is shifted to the mechanical first speed of the combination speed at the first speed 726 position shown in fig. 6, the solenoid valve switch 73 is turned on, the control valve 612 switches the circuit of the integrated hydraulic pump motor 60, the variable pump 611 forms an internal circulation circuit, and the variable pump 611 does not output power to the outside; at the same time, the control valve 612 shuts off and locks the internal circuit of the constant-displacement motor 613, and the constant-displacement motor 613 is in a braking state; the fixed displacement motor 613 is locked, so that the hydraulic output shaft 40, the hydraulic output shaft gear 41, the ring gear external gear 321 and the ring gear 32 driven by the fixed displacement motor 613 are locked; the power input by the input shaft 11 is converted by the planetary gear mechanism 30 to form a mechanical first gear; when the shift lever 72 slides up and down in the combination-gear slide groove 712, and when the shift lever 72 slides up in the middle of the combination-gear slide groove 712, the solenoid valve switch 73 is turned off, and the control valve 612 returns to the initial position, so that the integrated hydraulic pump motor 60 operates normally; as the shift lever 72 slides upward, the swash plate of the variable displacement pump 611 is shifted, the integral pump motor rotates at the forward gear 721, and at this time, the power acting on the planetary gear mechanism 30 is combined to form a first-gear stepless upshift; likewise, when the shift lever 72 slides down in the middle of the combination gear slide groove 712, a stepless speed reduction gear of first gear is formed. In this mode, the first power is transmitted from the input shaft 11 to the output shaft 21 through the sun gear 31, the planetary gear 331, the carrier 33, the carrier gear 332, the coupling sleeve driven gear 51, the coupling sleeve 50, and the spline hub 23 in this order; the second power is transmitted to the output shaft 21 from the hydraulic output shaft 40 through the hydraulic output shaft gear 41, the gear ring external gear 321, the gear ring 32, the planetary gear 331, the planet carrier 33, the planet carrier gear 332, the coupling sleeve driven gear 51, the coupling sleeve 50 and the spline hub 23 in sequence; the two paths of power are combined to form a mechanical first gear and a first gear stepless adjusting gear;

when the mechanical second gear is adopted, referring to fig. 4 and 6, the shift lever 72 is placed at the leftmost end of the mechanical gear chute 713, the coupling sleeve 50 is in the leftmost position and is meshed with the output shaft driven gear coupling teeth 221, and the multi-mode output integrated pump motor outputs the mechanical second gear. Power is transmitted from the input shaft 11 to the output shaft 21 through the input shaft drive gear 12, the output shaft driven gear 22, the output shaft driven gear engaging teeth 221, the engaging sleeve 50, and the spline hub 23 in this order.

As can be seen from the above description, the multi-mode output integrated pump motor of the present invention realizes multi-mode output of mechanical gears, hydraulic stepless gears, and mechanical hydraulic combination gears; the mechanical gear realizes the combination of high speed and low speed; the hydraulic stepless gear realizes the combination of forward and backward; the mechanical and hydraulic combined gear realizes stepless addition and subtraction adjustment based on mechanical low gear; the multi-mode output integrated pump motor can improve the efficiency of a hydraulic system and improve the fuel economy, and is particularly suitable for being applied to the field of variable speed driving of agricultural machinery.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by 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.