Hydraulic oil pump electric driving system for engineering machinery

Abstract

The utility model relates to the technical field of engineering machinery, and discloses a hydraulic oil pump electric driving system for engineering machinery, which comprises an electric driving system and a double-PTO (power take-off) speed reducer, and the electric driving system is a two-in-one system consisting of a permanent magnet synchronous motor with a high-speed flat wire and a controller of the permanent magnet synchronous motor. An electrically-driven inner spline shaft in the electric drive system is connected with an input shaft assembly of the double-PTO speed reducer, and the double-PTO speed reducer is connected with a first hydraulic oil pump and a second hydraulic oil pump through a first output shaft assembly and a second output shaft assembly respectively and then drives the hydraulic system. After the high-speed flat wire motor is adopted, a better light weight effect is achieved, a double-PTO output structure can provide power for more oil pumps compared with an existing single-path power output system, the system structure is more compact and more convenient to arrange when a whole vehicle is arranged, and compared with an existing scheme, the structure that the double PTO is connected with the hydraulic oil pump has the advantages that the system structure is more compact, and the whole vehicle is more convenient to arrange. The system cantilever length is greatly shortened, and the system reliability is better.

Description

Technical Field

[0001] This utility model relates to the field of engineering machinery technology, specifically to an electric drive system for a hydraulic oil pump used in engineering machinery. Background Technology

[0002] With the rapid development of the new energy construction machinery industry at home and abroad, the market for electrification of construction machinery-related products is currently booming. Since most construction machinery involves hydraulic transmission, and since the entire construction machinery vehicle generally requires the power of two or more hydraulic oil pumps, the development of a highly integrated and cost-effective hydraulic oil pump electric drive system is imminent.

[0003] Currently, there are several main solutions for the electric drive system of hydraulic oil pumps used in new energy construction machinery. One solution is to use a permanent magnet synchronous motor or other type of motor as the power source, and then connect one or more hydraulic oil pumps in series with it. Another solution is to replace the motor with a high-speed motor, add a reducer, and then connect one or more hydraulic oil pumps in series with it. Both solutions suffer from drawbacks, including excessively long system cantilever (posing safety hazards and product damage), the use of low-speed, round-wire motors (which are less efficient than high-speed, flat-wire motors), high system cost, and installation difficulties.

[0004] Therefore, for the electric drive system of hydraulic oil pumps in new energy engineering machinery, how to develop a high-performance, low-cost solution that addresses the above issues is one of the urgent technical challenges that the industry needs to solve. Utility Model Content

[0005] The purpose of this utility model is to provide an electric drive system for hydraulic oil pumps in engineering machinery to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An electric drive system for a hydraulic oil pump in engineering machinery includes an electric drive system and a dual PTO reducer. The electric drive system is a two-in-one system consisting of a high-speed flat wire permanent magnet synchronous motor and its controller. The electric drive system is connected to the input shaft assembly of the dual PTO reducer via the internal spline shaft of the electric drive. The dual PTO reducer is connected to hydraulic oil pump one and hydraulic oil pump two via output shaft assembly one and output shaft assembly two, respectively, and then drives the hydraulic system. The input shaft assembly of the dual PTO reducer mainly consists of an input gear shaft and a bearing. The output shaft assembly one of the dual PTO reducer mainly consists of an output shaft one, a gear one, and a bearing one. The bearing is located at the end of the input gear shaft. The output shaft one is located at the center of the gear one shaft, and the bearing one is installed at the end of the output shaft one. The output shaft assembly two of the dual PTO reducer consists of an output shaft two, a gear two, and a bearing two. The output shaft two is located at the center of the gear two shaft, and the bearing two is installed at the end of the output shaft two.

[0008] As a preferred technical solution of this utility model, the hydraulic oil pump one and the hydraulic oil pump two can be a series pump system of multiple pumps, which are connected to the output shaft two of the double PTO reducer via a spline between the output shaft one and the output shaft two.

[0009] As a preferred embodiment of this utility model, the second gear and the first gear are arranged symmetrically about the first output shaft.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] 1. The system of this utility model has a better lightweight effect after adopting a high-speed flat wire motor.

[0012] 2. This utility model adopts a dual PTO output structure, which, compared with the existing single-path power output system, can provide power to more oil pumps on the one hand, and the system structure is more compact and easier to arrange in the vehicle on the other hand.

[0013] 3. This utility model adopts a structure with dual PTO connected hydraulic oil pumps, which greatly shortens the cantilever length and improves system reliability compared to existing solutions. Attached Figure Description

[0014] Other features, objects and advantages of the present application will become more apparent upon reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0015] Figure 1 This is a schematic diagram of the system principle of this utility model;

[0016] Figure 2 This is a schematic diagram of the reducer principle of this utility model.

[0017] In the diagram: Electric drive system 100; Dual PTO reducer 200; Electric drive 101; Input shaft assembly 210; Hydraulic oil pump one 30; Hydraulic oil pump two 31; Input gear shaft 211; Gear one 222; Bearing one 223; Output shaft one 221; Output shaft assembly two 230; Output shaft two 232; Gear two 233; Bearing two 231. Detailed Implementation

[0018] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the utility model. Furthermore, it should be noted that, for ease of description, only the parts relevant to the utility model are shown in the accompanying drawings. In the embodiments of the present utility model, the different types of cross-sectional lines are not labeled according to national standards, nor do they specify material requirements for the components; they are used to distinguish the cross-sectional views of the components in the drawings.

[0019] Please see Figure 1-2 An electric drive system for a hydraulic oil pump in engineering machinery includes an electric drive system 100 and a dual PTO reducer 200. The electric drive system 100 is a two-in-one system consisting of a high-speed flat wire permanent magnet synchronous motor and its controller. The electric drive 101 in the electric drive system 100 is connected to the input shaft assembly 210 of the dual PTO reducer 200 through the internal splined shaft. The dual PTO reducer 200 is connected to a hydraulic oil pump 30 and a hydraulic oil pump 31 through an output shaft assembly 220 and an output shaft assembly 230, respectively, thus driving the hydraulic system. The input shaft assembly 210 of the dual PTO reducer 200 mainly consists of an input gear. The output shaft assembly 220 of the dual PTO reducer 200 consists of a shaft 211 and a bearing 212. The output shaft assembly 220 mainly consists of an output shaft 221, a gear 222, and a bearing 223. The bearing 212 is located at the end of the input gear shaft 211. The output shaft 221 is located at the center of the gear 222. The bearing 223 is installed at the end of the output shaft 221. The output shaft assembly 230 of the dual PTO reducer 200 consists of an output shaft 232, a gear 233, and a bearing 231. The output shaft 232 is installed at the center of the gear 233. The bearing 231 is installed at the end of the output shaft 232.

[0020] Hydraulic oil pump 30 and hydraulic oil pump 31 can be a series pump system of multiple pumps, which are connected to each other through the spline of the output shaft 232 of the double PTO reducer 200 and the output shaft 221.

[0021] Among them, gear 233 and gear 122 are arranged symmetrically about output shaft 221.

[0022] The working principle and usage process of this utility model are as follows: First, the adoption of a high-speed flat wire motor brings better weight reduction effect. The dual PTO output structure, compared with the existing single-path power output system, can provide power to more oil pumps. On the other hand, the system structure is more compact and easier to arrange in the vehicle. The structure of dual PTO connecting hydraulic oil pumps has a significantly shorter cantilever length and better system reliability compared with the existing solution. The contents not described in detail in this description are existing technologies known to those skilled in the art.

[0023] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the utility model involved in this application is not limited to the technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An electric drive system for a hydraulic oil pump in engineering machinery, comprising an electric drive system (100) and a dual PTO reducer (200), characterized in that: The electric drive system (100) is a two-in-one system consisting of a high-speed flat wire permanent magnet synchronous motor and its controller. The electric drive (101) in the electric drive system (100) is connected to the input shaft assembly (210) of the dual PTO reducer (200) through the internal spline shaft of the electric drive (101). The dual PTO reducer (200) is connected to the hydraulic oil pump (30) and the hydraulic oil pump (31) through the output shaft assembly (220) and the output shaft assembly (230) respectively, and then drives the hydraulic system. The input shaft assembly (210) of the dual PTO reducer (200) is mainly composed of the input gear shaft (211) and the bearing (212). The output shaft of the dual PTO reducer (200) is... Assembly 1 (220) mainly consists of output shaft 1 (221), gear 1 (222) and bearing 1 (223). The bearing (212) is located at the end of the input gear shaft (211). Output shaft 1 (221) is located at the center of the gear 1 (222). Bearing 1 (223) is installed at the end of the output shaft 1 (221). The output shaft assembly 2 (230) of the dual PTO reducer (200) consists of output shaft 2 (232), gear 2 (233) and bearing 2 (231). Output shaft 2 (232) is installed at the center of the gear 2 (233). Bearing 2 (231) is installed at the end of the output shaft 2 (232).

2. The hydraulic oil pump electric drive system for engineering machinery according to claim 1, characterized in that: The hydraulic pump one (30) and the hydraulic pump two (31) can be a series pump system of multiple pumps, which are connected to the output shaft two (232) of the double PTO reducer (200) via a spline between the output shaft one (221).

3. The hydraulic oil pump electric drive system for engineering machinery according to claim 1, characterized in that: The gear two (233) and gear one (222) are arranged symmetrically about the output shaft one (221).

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