Motor driving structure of electric loader

Abstract

The invention relates to a motor driving structure of an electric loader. The motor driving structure comprises a walking motor, a hydraulic motor and a transmission shaft assembly. The transmission shaft assembly comprises an outer transmission shaft and an inner transmission shaft; the outer transmission shaft and the inner transmission shaft are coaxial, the outer transmission shaft is provided with a containing through hole in the axial length direction, the inner transmission shaft penetrates through the containing through hole, and a bearing is arranged between the inner transmission shaft and the outer transmission shaft. A rotor of the walking motor is of a hollow shaft structure, and the outer transmission shaft penetrates through the rotor of the walking motor and is in transmission connection with the rotor of the walking motor. The other end of the outer transmission shaft is connected with wheels of the vehicle body; and the other end of the inner transmission shaft is connected with the hydraulic oil pump. According to the motor driving system, the walking motor, the hydraulic motor and all transmission shaft structures are integrated, the size of the motor driving structure is reduced, and the integration degree of the loader driving structure is improved.

Description

Technical Field

[0001] The present application relates to the technical field of loader driving, and in particular to a motor driving structure of an electric loader. Background Art

[0002] A wheel loader is a kind of engineering machinery, whose main function is to shovel, transport and unload loose materials, such as soil, sand, gravel, coal, etc. Therefore, the transmission system of the wheel loader needs to provide power to the bucket and wheels respectively.

[0003] Existing electric loaders divide the high-power motor into two motors to provide power input. Among them, the travel motor is generally set on the chassis and connected to the drive axle. The hydraulic motor is generally set on the side of the hydraulic oil pump, near the bucket.

[0004] The existing electric loaders have separate motor arrangements, which causes inconvenience to the maintenance and replacement of the motors.

[0005] Therefore, in order to further reduce the assembly volume of the motor group, the present application provides a motor drive structure for an electric loader. Summary of the invention

[0006] In order to overcome the problems existing in the related art, the present application provides a motor drive structure of an electric loader, comprising: a travel motor, a hydraulic motor and a transmission shaft assembly;

[0007] The transmission shaft assembly includes an outer transmission shaft and an inner transmission shaft;

[0008] The outer transmission shaft is coaxial with the inner transmission shaft, the outer transmission shaft is provided with a receiving through hole along the axial length direction, the inner transmission shaft passes through the receiving through hole, and a bearing is provided between the inner transmission shaft and the outer transmission shaft;

[0009] The travel motor and the hydraulic motor are arranged on the same side of the axial length direction of the transmission shaft assembly;

[0010] The rotor of the travel motor is a hollow shaft structure, the outer transmission shaft passes through the rotor of the travel motor, and the outer transmission shaft is drivingly connected to the rotor of the travel motor;

[0011] One end of the outer transmission shaft is connected to the travel motor, and the other end is connected to the wheel of the vehicle body;

[0012] One end of the inner transmission shaft is transmission-connected to the hydraulic motor, and the other end is connected to the hydraulic oil pump.

[0013] In one embodiment, a second bearing is further provided between the outer transmission shaft and the travel motor.

[0014] In one embodiment, a cooling oil pipeline and a cooling oil containing chamber are provided in the inner transmission shaft, the cooling oil pipeline is arranged along the radial direction of the inner transmission shaft, the gap between the outer transmission shaft and the inner transmission shaft forms the cooling oil containing chamber, and the cooling oil pipeline passes through the cooling oil containing chamber; an oil pump impeller is provided on the outer wall of the inner transmission shaft, and the oil pump impeller is used to throw the cooling oil out of the cooling oil containing chamber.

[0015] In one embodiment, a gearbox is further included: the outer transmission shaft is connected to the input end of the gearbox.

[0016] In one embodiment, a clutch is further included: the clutch is connected to the gearbox.

[0017] In one embodiment, it also includes: a main transmission shaft, a front drive axle and a rear drive axle; the front drive axle is installed on the front wheel of the loader, and the rear drive axle is installed on the rear wheel of the loader; one end of the main transmission shaft is connected to the output end of the gearbox, and the other end is connected to the rear drive axle.

[0018] In one embodiment, the external transmission shaft connected to the travel motor is meshed with the primary input gear of the gearbox via a spline.

[0019] In one embodiment, the gearbox is provided with gear sets with different gear positions.

[0020] In one embodiment, the gearbox is a star gearbox.

[0021] The technical solution provided by this application may have the following beneficial effects:

[0022] In the motor drive structure provided in the present application, the hydraulic motor and the travel motor are connected in series on the same side of the transmission shaft assembly to form a combined layout. The inner transmission shaft and the outer transmission shaft of the transmission shaft assembly are sleeved and a bearing is sandwiched between the two to form a coaxial drive. Finally, the hydraulic motor and the travel motor drive the inner transmission shaft and the outer transmission shaft to rotate independently, respectively, and transmit power to the hydraulic oil pump and the drive axle, respectively.

[0023] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and other objects, features and advantages of the present application will become more apparent through a more detailed description of exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.

[0025] Figure 1 A schematic diagram of a three-dimensional structure of a motor drive structure shown in an embodiment of the present application;

[0026] Figure 2 A schematic diagram of the three-dimensional structure of the transmission shaft assembly shown in an embodiment of the present application;

[0027] Figure 3 It is a schematic diagram of the three-dimensional structure of the inner transmission shaft shown in the embodiment of the present application;

[0028] Figure 4 AA is a schematic cross-sectional view of the transmission shaft assembly shown in the embodiment of the present application;

[0029] Figure 5 This is a logic block diagram of the motor drive structure shown in an embodiment of the present application.

[0030] Description of the accompanying drawings: travel motor 1, hydraulic motor 2, transmission shaft assembly 3, outer transmission shaft 31, cooling oil pipeline 311, cooling oil accommodating chamber 312, oil pump impeller 313, inner transmission shaft 32, accommodating through hole 321, first bearing 41, second bearing 42. DETAILED DESCRIPTION

[0031] The preferred embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0032] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms of "a", "said" and "the" used in this application and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0033] It should be understood that although the terms "first", "second", "third", etc. may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0034] Embodiment 1

[0035] In a fuel loader, the engine outputs power to the wheel drive axle and the hydraulic oil pump. The wheel drive axle drives the loader to move, while the hydraulic oil pump is used to control the hydraulic system. The bucket, cab and engine compartment are arranged on the top of the chassis in sequence.

[0036] In electric loaders, the engine compartment is equipped with a power battery, which can balance the force of the bucket when it is loaded. However, the power battery is large in size, and the space in the engine compartment cannot accommodate a high-power motor.

[0037] Existing electric loaders divide the high-power motor into two motors to provide power input. Among them, the travel motor is generally set on the chassis and connected to the drive axle. The hydraulic motor is generally set on the side of the hydraulic oil pump, near the bucket.

[0038] The existing electric loaders have separate motors, which causes inconvenience in motor maintenance and replacement. Therefore, in order to further reduce the assembly volume of the motor group, the embodiment of the present application provides a motor drive structure for an electric loader.

[0039] like Figure 1 As shown, the motor drive structure includes: a travel motor 1, a hydraulic motor 2 and a transmission shaft assembly 3.

[0040] In the embodiment of the present application, the transmission shaft assembly 3 includes an outer transmission shaft 31 and an inner transmission shaft 32 .

[0041] Specifically, the outer transmission shaft 31 is coaxial with the inner transmission shaft 32 , the outer transmission shaft 31 is provided with a receiving through hole 321 along the axial length direction, the inner transmission shaft 32 passes through the receiving through hole 321 , and a bearing is provided between the inner transmission shaft 32 and the outer transmission shaft 31 .

[0042] In the embodiment of the present application, the power of the travel motor 1 and the hydraulic motor 2 is output to the transmission shaft assembly 3, thereby reducing the space of one transmission shaft.

[0043] Furthermore, the travel motor 1 and the hydraulic motor 2 are arranged on the same side of the axial length direction of the transmission shaft assembly 3 .

[0044] In the existing electric loader, in order to avoid the drive shaft being too long, the travel motor 1 is arranged near the drive axle, and the hydraulic motor 2 is arranged near the hydraulic system.

[0045] In the embodiment of the present application, the travel motor 1 and the hydraulic motor 2 are connected in series front and back.

[0046] Specifically, Figure 2As shown, the rotor of the travel motor 1 is a hollow shaft structure, and the outer transmission shaft 31 is inserted into the accommodating through hole 321 of the outer transmission shaft 32. A bearing is sandwiched between the inner transmission shaft 31 and the outer transmission shaft 32. The outer transmission shaft 31 is connected to the rotor of the travel motor 1 in a transmission manner. One end of the outer transmission shaft 31 is connected to the travel motor 1, and the other end is connected to the drive axle of the vehicle body. One end of the inner transmission shaft 32 is connected to the hydraulic motor 2 in a transmission manner, and the other end is connected to the hydraulic oil pump.

[0047] In the motor drive structure provided in the embodiment of the present application, the hydraulic motor 2 and the travel motor 1 are connected in series on the same side of the transmission shaft assembly 3 to form a combined layout. The inner transmission shaft 32 and the outer transmission shaft 31 of the transmission shaft assembly 3 are sleeved and a bearing is sandwiched between the two to form a coaxial drive. Finally, the hydraulic motor 2 and the travel motor 1 respectively drive the inner transmission shaft 32 and the outer transmission shaft 31 to rotate independently, and transmit power to the hydraulic oil pump and the drive axle respectively.

[0048] The motor drive structure shown in the embodiment of the present application integrates two sets of motors and arranges them on the chassis of the loader. When the motor drive structure needs to be repaired, the difficulty of maintenance caused by the two sets of motors being arranged at different positions of the vehicle body is avoided.

[0049] Embodiment 2

[0050] In electric loaders, high-power motors are usually configured to provide sufficient torque for the hydraulic system and the drive axle. However, the heat generated by the high-power motor during operation is a problem that cannot be ignored. In the prior art, coolant is usually supplied to the motor for heat dissipation.

[0051] In the prior art, a pipeline is usually opened in the radial direction of the rotating shaft, and the centrifugal force of the rotating rotor is used to throw the coolant onto the rotor winding or the stator winding, thereby cooling the rotor.

[0052] The embodiment of the present application also provides a motor drive structure of an electric loader. Based on the motor drive structure of the first embodiment, since two groups of motors are arranged front and back, the cooling channels of the motor rotors need to be rearranged.

[0053] Therefore, further, Figure 3 As shown, a cooling oil pipeline 311 and a cooling oil accommodating chamber 312 are provided in the inner transmission shaft 32 , and the cooling oil pipeline 311 is provided along the radial direction of the inner transmission shaft 32 .

[0054] exist Figure 4In the embodiment, the inner wall of the outer transmission shaft 31, the outer wall of the inner transmission shaft 32, the first bearing 41 and the second bearing 42 form the cooling oil receiving chamber 312. The oil hole of the cooling oil pipeline 311 is connected to the cooling oil receiving chamber 312, and the outer transmission shaft 31 is provided with an oil hole at a position corresponding to the cooling oil receiving chamber 312.

[0055] Furthermore, an oil pump impeller 313 is disposed on the outer wall of the inner transmission shaft 32 , and the oil pump impeller 313 is used to throw the cooling oil out of the cooling oil containing chamber 312 .

[0056] In the embodiment of the present application, cooling oil flows in from the input hole of the cooling oil pipeline 311, and flows out from the oil hole connected to the cooling oil receiving chamber 312 and the oil hole connected to the hydraulic motor 2. At the same time, when the inner transmission shaft 32 rotates, the cooling oil is thrown out from the oil hole under the action of centrifugal force. When the cooling oil fills the cooling oil receiving chamber 312, the oil pump impeller 313 rotates to increase the pressure in the cooling oil receiving chamber, and pumps the cooling oil out from the oil hole of the cooling oil receiving chamber 312.

[0057] Further, such as Figure 5 As shown, the motor drive structure also includes a gearbox, a clutch, a main drive shaft, a front drive axle and a rear drive axle;

[0058] In the embodiment of the present application, the outer transmission shaft 31 is connected to the input end of the gearbox. The front drive axle is installed on the front wheel of the loader, and the rear drive axle is installed on the rear wheel of the loader. One end of the main transmission shaft is connected to the output end of the gearbox, and the other end is connected to the rear drive axle.

[0059] Furthermore, the outer transmission shaft 32 connected to the travel motor 1 is meshed with the primary input gear of the gearbox through a spline. The gearbox is provided with a gear set with different gears. The gearbox is a star gearbox.

[0060] In the embodiment of the present application, the transmission main shaft is reduced in one stage to transmit the power to the input shaft of the gearbox, and then to the sun gear and the planetary gear. According to different gear operations, the corresponding clutch is engaged, and the power is transmitted to the output shaft of the gearbox after passing through the planetary reduction mechanism, driving the whole machine forward and backward.

[0061] Regarding the device in the above embodiment, the specific way in which each module performs the operation has been described in detail in the embodiment of the method, and will not be elaborated here.

[0062] The scheme of the present application has been described in detail above with reference to the accompanying drawings. In the above embodiments, the description of each embodiment has its own emphasis. For the part that is not described in detail in a certain embodiment, refer to the relevant description of other embodiments. Those skilled in the art should also know that the actions and modules involved in the description are not necessarily required for the present application. In addition, it can be understood that the steps in the method of the embodiment of the present application can be adjusted in order, merged and deleted according to actual needs, and the modules in the device of the embodiment of the present application can be merged, divided and deleted according to actual needs.

[0063] In addition, the method according to the present application may also be implemented as a computer program or a computer program product, which includes computer program code instructions for executing some or all of the steps in the above method of the present application.

[0064] Alternatively, the present application can also be implemented as a non-temporary machine-readable storage medium (or computer-readable storage medium, or machine-readable storage medium) on which executable code (or computer program, or computer instruction code) is stored. When the executable code (or computer program, or computer instruction code) is executed by a processor of an electronic device (or electronic device, server, etc.), the processor executes part or all of the steps of the above-mentioned method according to the present application.

[0065] Those skilled in the art will further appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps described in connection with the application herein may be implemented as electronic hardware, computer software, or combinations of both.

[0066] The flow chart and block diagram in the accompanying drawings show the possible architecture, function and operation of the system and method according to multiple embodiments of the present application. In this regard, each square box in the flow chart or block diagram can represent a part of a module, a program segment or a code, and the part of the module, the program segment or the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two continuous square boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or the flow chart, and the combination of the square boxes in the block diagram and / or the flow chart can be implemented with a dedicated hardware-based system that performs the specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0067] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A motor drive structure for an electric loader, characterized in that: include: Travel motor (1), hydraulic motor (2) and transmission shaft assembly (3); The transmission shaft assembly (3) comprises an outer transmission shaft (31) and an inner transmission shaft (32); The outer transmission shaft (31) is coaxial with the inner transmission shaft (32); the outer transmission shaft (31) is provided with a receiving through hole (321) along the axial length direction; the inner transmission shaft (32) passes through the receiving through hole (321); and a bearing is provided between the inner transmission shaft (32) and the outer transmission shaft (31); The travel motor (1) and the hydraulic motor (2) are arranged on the same side of the axial length direction of the transmission shaft assembly (3); The rotor of the travel motor (1) is a hollow shaft structure, the outer transmission shaft (31) passes through the rotor of the travel motor (1), and the outer transmission shaft (31) is drivingly connected to the rotor of the travel motor (1); One end of the external transmission shaft (31) is connected to the travel motor (1), and the other end is connected to the wheel of the vehicle body; One end of the inner transmission shaft (32) is transmission-connected to the hydraulic motor (2), and the other end is connected to the hydraulic oil pump.

2. The motor drive structure of an electric loader according to claim 1, characterized in that: The first bearing (41) and the second bearing (42) are also provided between the outer transmission shaft (31) and the travel motor (1).

3. The motor drive structure of an electric loader according to claim 2, characterized in that: A cooling oil pipeline (311) and a cooling oil containing chamber (312) are arranged in the inner transmission shaft (32); the cooling oil pipeline (311) is arranged along the radial direction of the inner transmission shaft (32); a gap between the outer transmission shaft (31) and the inner transmission shaft (32) forms the cooling oil containing chamber (312); and the cooling oil pipeline (311) passes through the cooling oil containing chamber (312); An oil pump impeller (313) is arranged on the outer wall of the inner transmission shaft (32), and the oil pump impeller (313) is used to throw the cooling oil out of the cooling oil accommodating chamber (312).

4. The motor drive structure of an electric loader according to claim 1, characterized in that: Also includes gearbox: The external transmission shaft (31) is connected to the input end of the gearbox.

5. The motor drive structure of an electric loader according to claim 4, characterized in that: A clutch is also included: the clutch is connected to the gearbox.

6. The motor drive structure of an electric loader according to claim 5, characterized in that: It also includes: a total transmission shaft, a front drive axle and a rear drive axle; the front drive axle is installed on the front wheel of the loader, and the rear drive axle is installed on the rear wheel of the loader; one end of the total transmission shaft is connected to the output end of the gearbox, and the other end is connected to the rear drive axle.

7. The motor drive structure of an electric loader according to claim 6, characterized in that: The external transmission shaft (32) connected to the travel motor (1) is meshed with the primary input gear of the gearbox via a spline.

8. The motor drive structure of an electric loader according to claim 6, characterized in that: The gearbox is provided with gear sets with different gear positions.

9. The motor drive structure of an electric loader according to claim 8, characterized in that: The gearbox is a star gearbox.

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