Power transmission system of electric carry-scraper

Abstract

The utility model discloses a power transmission system of an electric carry-scraper, and belongs to the technical field of carry-scrapers. The power transmission system of the electric carry-scraper comprises an alternating-current motor, a gear box, a gearbox, a first pump set, a second pump set and a third pump set. The alternating-current motor is connected with the gearbox through an elastic coupler, the gearbox is provided with a first output port and a second output port, the first output port is coaxial with an input shaft of the gearbox and connected with the first pump set, and the second output port is connected with the gearbox through a torque converter. The gearbox is provided with a first transmission port, a second transmission port and an axle transmission port, the first transmission port is connected with the second pump set, the second transmission port is connected with the third pump set, and the axle transmission port is connected with an axle. Compared with an existing alternating-current-driven electric carry-scraper, one motor is omitted, kinetic energy of the motor can be fully utilized, the system installation space is reduced, and the whole machine is convenient to maintain.

Description

Technical Field

[0001] The utility model relates to the technical field of loaders, and more specifically, to a power transmission system for an electric loader. Background Art

[0002] The hydraulic system of an electric loader generally includes multiple pump groups to achieve various functions of the loader. Therefore, the hydraulic system requires a large driving power and torque. At present, the power transmission system of an AC-driven electric loader is restricted by the load-carrying capacity problem of the PTO port of the gearbox, and two motors must be matched to drive two hydraulic systems. One motor drives the brake pump, cable reel pump, etc. in a hydraulic system through two PTO ports of the gearbox, and the gearbox drives the axle at the same time. The other motor drives another hydraulic system to realize the functions of lifting, dumping the bucket and turning the whole vehicle. The cost is relatively high, resulting in poor visibility of the whole machine and small maintenance space.

[0003] For example, the Chinese patent document (Publication No.: CN 106347118 A) provides a transmission system for an underground loader. The transmission system further includes a gearbox, which converts the output of the hydraulic drive motor into two paths and directly outputs them to two hydraulic pumps respectively to provide power for the actuator and the cooling / lubrication system. The actuators of the underground loader include a braking system, a steering system, a boom lifting system, a bucket tipping system, etc. However, this transmission system is only applicable to DC-driven electric loaders and is not applicable to AC-driven electric loaders.

[0004] In view of the above problems, the related art does not provide an effective solution. Summary of the Utility Model

[0005] In order to solve the problems that may exist in the related art, some embodiments of the present application provide a power transmission system for an electric loader, which includes an AC motor, a gearbox, a gearbox, a first pump group, a second pump group and a third pump group;

[0006] The AC motor is connected to the gearbox through an elastic coupling. The gearbox has a first output port and a second output port. The first output port is coaxial with the input shaft of the gearbox and is connected to the first pump group. The second output port is connected to the gearbox through a torque converter. The gearbox has a first transmission port, a second transmission port and an axle transmission port. The first transmission port is connected to the second pump group, the second transmission port is connected to the third pump group, and the axle transmission port is connected to the axle.

[0007] Further, the first output port is connected to the first pump group through a speed-up transmission ratio.

[0008] Further, the second output port is connected to the gearbox through a speed-up transmission ratio.

[0009] Further, the first pump group is a steering pump, a bucket control pump and an air-conditioning pump.

[0010] Further, the second pump group is a brake pump and a cooling system pump, and the third pump group is a cable reeling pump.

[0011] Further, the first pump group is a bucket control pump and a cooling system pump.

[0012] Further, the second pump group is a steering pump and a brake pump, and the third pump group is a cable reeling pump and an air-conditioning pump.

[0013] Further, the first pump group is a brake pump.

[0014] Further, the second pump group is a steering pump, a cable reeling pump and a cooling system pump, and the third pump group is a bucket control pump and an air-conditioning pump.

[0015] Adopting the technical solution provided by the present utility model, compared with the prior art, the following beneficial effects are achieved:

[0016] Compared with the existing AC-driven electric load-haul-dumpers, one electric motor is omitted, and the kinetic energy of the electric motor can be fully utilized, reducing the system installation space and facilitating the maintenance of the whole machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of this application are used to provide a further understanding of this application, making other features, objectives and advantages of this application more obvious. The schematic embodiments and descriptions of the drawings of this application are used to explain this application and do not constitute an improper limitation to this application. In the drawings:

[0018] Figure 1 It is a partial structural schematic diagram of the power transmission system of an electric load-haul-dumper according to an embodiment of this application;

[0019] Reference Signs Description:

[0020] 1. Electric motor;

[0021] 2. Elastic coupling;

[0022] 3. Gearbox;

[0023] 4. First pump group;

[0024] 5. Transmission shaft;

[0025] 6. Gearbox. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] To enable those skilled in the art to better understand the solution of this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0027] It should be noted that the terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances for the embodiments of this application described here.

[0028] In this application, the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe this application and its embodiments, and are not used to limit that the indicated devices, elements or components must have a specific orientation or be constructed and operated in a specific orientation. And, in addition to being able to represent the orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0029] As Figure 1 shown, as provided in this embodiment, a power transmission system for an electric LHD is provided. The main power source is alternating current, including an alternating current motor 1, a gearbox 3, a gearbox 6, a first pump group 4, a second pump group, and a third pump group. Among them, the first pump group 4, the second pump group, and the third pump group specifically include a bucket control pump, a cooling system pump, a steering pump, a brake pump, a cable reel pump, and an air conditioning pump to realize the various functions of the LHD.

[0030] Among them, as Figure 1 shown, the alternating current motor 1 is connected to the gearbox 3 through an elastic coupling 2. The gearbox 3 has a first output port and a second output port. The first output port is coaxial with the input shaft of the gearbox 3 and is connected to the first pump group 4, and the second output port is connected to the gearbox 6 through a torque converter. The gearbox 6 has two first transmission ports, a second transmission port, and an axle transmission port. The first transmission port is connected to the second pump group, the second transmission port is connected to the third pump group, and the axle transmission port is connected to the axle. Specifically, the torque converter and the gearbox 6 are integrated and are a hydraulic torque converter.

[0031] In this way, compared with the existing AC-driven electric loaders, one electric motor is omitted, and the kinetic energy of the electric motor 1 can be fully utilized, reducing the system installation space and making the whole machine easy to maintain.

[0032] Specifically, compared with the relevant applications of the internal gearbox 3 in DC-driven electric loaders, first of all, since the power source of the electric loader in this embodiment is alternating current rather than direct current, there is no need to consider the problem of power recovery. The AC motor 1 and the gearbox 3 are elastically connected instead of rigidly connected, which can effectively reduce the load fluctuation in the transmission system and reduce the impact force on the motor 1 and the gearbox 3 caused by the load fluctuation, ultimately improving the service life of the motor 1 and the gearbox 3.

[0033] Secondly, since the kinetic energy of the DC motor is supplied by the battery and its electric energy is very limited, the DC motor generally has a speed regulation function. The AC motor in this embodiment does not need to consider the problem of electric energy supply. Usually, the AC motor does not have a speed regulation function. In order to enable the axle to work smoothly and efficiently, the second output port of the gearbox 3 is connected to the gearbox 6 through a torque converter, and the second pump group and the third pump group make full use of the kinetic energy.

[0034] Specifically, the first output port is connected to the first pump group 4 through a speed-up transmission ratio. This design can significantly reduce the height of the gearbox 3 and further reduce the height dimension of the electric loader. When the driver operates the loader, it can improve the rear view of the whole machine and reduce the operation risk.

[0035] Furthermore, the second output port is connected to the gearbox 6 through a speed-up transmission ratio. The use of a speed-up transmission ratio at this output port can increase the speed to reach the best matching state with the torque converter to output a greater traction force and speed, etc. Furthermore, the second output port is connected to the hydraulic torque converter of the gearbox 6 through an additional transmission shaft 5, which can make up for the axial distance and installation error between the output port of the gearbox 3 and the input port of the gearbox 6.

[0036] As a specific solution, the first pump group 4 is a steering pump, a bucket control pump and an air-conditioning pump. Furthermore, the second pump group is a brake pump and a cooling system pump, and the third pump group is a cable reel pump. Since the first output port is coaxial with the input shaft of the gearbox 3 and the first pump group 4 is connected to the first output port, using the steering pump, the bucket control pump and the air-conditioning pump as the first pump group 4 can maximize the driving ability of the power take-off port of the gearbox 3, and the steering pump and the bucket control pump are fully loaded, and the energy of the whole vehicle is fully utilized.

[0037] As another specific solution, the first pump group 4 is a bucket control pump and a cooling system pump. Further, the second pump group is a steering pump and a brake pump, and the third pump group is a cable reeling pump and an air-conditioning pump. In this way, the power demand distribution among the pump groups is more balanced, and the outer dimensions and displacements of different pump groups are close to each other, which is beneficial to pipeline layout and convenient for users to install and maintain later.

[0038] As yet another alternative solution, the first pump group 4 is a brake pump. Further, the second pump group is a steering pump, a cable reeling pump and a cooling system pump, and the third pump group is a bucket control pump and an air-conditioning pump. Since the second pump group and the third pump group are connected to the power take-off ports of the gearbox 6, in this solution, the driving demands of the steering pump and the bucket control pump are placed at the power take-off ports of the gearbox 6, which can maximize the utilization of the driving capacity of the power take-off ports of the gearbox 6. Thus, the driving capacity reserved at the power take-off ports of the gearbox 3 can meet the driving demands of other functions added during the whole vehicle modification.

[0039] Generally speaking, the two driving ports of the gearbox 6 and the output port of the gearbox 3 can provide three power driving sources for the hydraulic system of the whole machine, thereby significantly expanding the driving capacity of the hydraulic system, improving the hydraulic system performance of the electric scraper, and reducing the manufacturing cost of the scraper.

[0040] In this application, the terms "install", "set", "be provided with", "connect", "be connected", "be sleeved" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there is internal communication between two devices, components or parts. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0041] The above are only the preferred embodiments of this application and are not used to limit this application. For those skilled in the art, various changes and modifications can be made to this application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.

Claims

1. A power transmission system for an electric LHD loader, characterized in that: It includes an AC motor, a gearbox, a transmission, a first pump group, a second pump group and a third pump group; The AC motor is connected to the gearbox through an elastic coupling. The gearbox has a first output port and a second output port. The first output port is coaxial with the input shaft of the gearbox and is connected to the first pump group, and the second output port is connected to the transmission through a torque converter; the transmission has a first transmission port, a second transmission port and an axle transmission port. The first transmission port is connected to the second pump group, the second transmission port is connected to the third pump group, and the axle transmission port is connected to the axle.

2. The power transmission system for an electric LHD loader according to claim 1, characterized in that: The first output port is connected to the first pump group through a speed-up transmission ratio.

3. The power transmission system for an electric LHD loader according to claim 1 or 2, characterized in that: The second output port is connected to the transmission through a speed-up transmission ratio.

4. The power transmission system for an electric LHD loader according to claim 1, characterized in that: The first pump group is a steering pump, a bucket control pump and an air-conditioning pump.

5. The power transmission system for an electric LHD loader according to claim 4, characterized in that: The second pump group is a brake pump and a cooling system pump, and the third pump group is a cable reeling pump.

6. The power transmission system for an electric LHD loader according to claim 1, characterized in that: The first pump group is a bucket control pump and a cooling system pump.

7. The power transmission system for an electric LHD loader according to claim 6, characterized in that: The second pump group is a steering pump and a brake pump, and the third pump group is a cable reeling pump and an air-conditioning pump.

8. The power transmission system for an electric LHD loader according to claim 1, characterized in that: The first pump group is a brake pump.

9. The power transmission system for an electric LHD loader according to claim 8, characterized in that: The second pump group is a steering pump, a cable reeling pump and a cooling system pump, and the third pump group is a bucket control pump and an air-conditioning pump.

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