Hybrid power system of excavator

Abstract

The utility model belongs to the technical field of power systems, and particularly discloses an excavator hybrid power system which comprises an upper frame, and an electrical storage device, a motor-driven rotation system and a power distribution device used for distributing power to the motor-driven rotation system are installed on the upper frame. A hydraulic pump and a power generation type motor are arranged on one side of the power distribution device, and a driving type engine and an engine radiator are arranged on the other side of the power distribution device; the output end of the hydraulic pump, the output end of the driving engine and the output end of the power generation type motor are all connected to a power distribution device, the parallel hybrid power excavator is adapted, the universal use of parts is realized, the flexible selection of various frameworks is realized, the manufacturing cost is low, the development period is short, and the parallel hybrid power excavator is stable and energy-saving.

Description

TECHNICAL FIELD

[0001] The utility model belongs to power system technical field, concretely relates to a kind of excavator hybrid power system. BACKGROUND

[0002] Excavator is one of main machines in engineering machinery field, and its working environment is generally in harsh environment such as mine and open field.As excavating operation, the load of excavator varies very sharply, and it switches between empty load and full load periodically, even overload, and the torque of engine fluctuates sharply with load change, and the speed also fluctuates greatly, so that engine often works in transient condition, resulting in poor fuel economy and emission.In order to improve fuel economy and emission, medium and large excavators generally adopt oil-electric hybrid power technology;In this technology, a set of power system such as generator, motor, slewing motor, super capacitor, various rectifiers and inverters is added, which causes great challenge to the compact overall space.

[0003] If redesigned to adapt to hybrid excavator, the configuration structure suitable for hybrid operation vehicle can be obtained, but compared with traditional hydraulic excavator, hybrid excavator increases generator motor and slewing motor, and in addition, control equipment for controlling these devices or cooling circuit for cooling these devices must be configured, so as to cause increase of manufacturing cost.Usually, parallel oil-electric hybrid power system is mechanically connected through a through shaft, and the overall machine is easy to be too wide, or the generator needs to be customized and developed, which is low in generalization and high in cost. UTILITY MODEL CONTENT

[0004] In view of the problems that the generalization degree of prior art hybrid power system structure needs to be improved, the development cycle needs to be shortened, and the manufacturing cost needs to be reduced, the present application provides an excavator hybrid power system.The utility model provides the following technical scheme:

[0005] An excavator hybrid power system, comprising an upper frame, wherein an electric storage device, a motor-driven slewing system and a power distribution device for distributing power to the motor-driven slewing system are installed on the upper frame; a hydraulic pump and a generator motor are arranged on one side of the power distribution device, and a driving engine and an engine radiator are arranged on the other side of the power distribution device; the output end of the hydraulic pump, the output end of the driving engine and the output end of the generator motor are all connected to the power distribution device.

[0006] Preferably, a fuel tank and a hydraulic oil tank are installed on the upper frame, and the fuel tank and the hydraulic oil tank are arranged side by side.

[0007] Preferably, the fuel tank and the hydraulic oil tank are arranged on one side of the upper frame, and a hydraulic oil radiator is arranged on the other side of the frame.

[0008] Preferably, the hydraulic oil radiator is arranged side by side with the engine radiator.

[0009] Preferably, the power storage device is arranged on the oblique upper side of the drive engine through a support assembly.

[0010] Preferably, the power storage device adopts a lithium battery or a super capacitor.

[0011] Preferably, the drive engine adopts a fuel engine or a gas engine or a hydrogen engine.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] 1. Adapted to a parallel hybrid excavator, realizing generalization of components;

[0014] 2. Flexible selection of various architectures, low manufacturing cost and short development cycle;

[0015] 3. The drive engine and the generator motor cooperate, compared with a traditional model, can better realize steady-state work and energy saving, and simultaneously output to realize work efficiency improvement. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a whole machine layout diagram;

[0017] Figure 2 is a whole machine layout top view;

[0018] Figure 3 is a whole machine layout side view;

[0019] Figure 4 is a whole machine layout front view;

[0020] In the drawings, 1 is a power storage device; 2 is a drive engine; 3 is an engine radiator; 4 is a hydraulic oil radiator; 5 is a first drive rotary system; 6 is a second drive rotary system; 7 is an upper frame; 8 is a fuel tank; 9 is a hydraulic oil tank; 10 is a hydraulic main pump; 11 is a hydraulic auxiliary pump; 12 is a generator motor; and 13 is a power distribution device. DETAILED DESCRIPTION

[0021] The directions mentioned in the following embodiments, such as "up", "down", "left", "right", etc. are only the directions of the drawings, therefore, the directions used are used for illustration but not for limiting the utility model creation.

[0022] As Figures 1-4 shown, a hybrid power system of excavator, comprising a superframe 7, the superframe 7 is installed with a power storage device 1, a motor drive slewing system and a power distribution device 13 for distributing power to the motor drive slewing system; the power distribution device 13 is provided with a hydraulic pump and a generator motor 12 on one side, and a driving engine 2 and an engine radiator 3 on the other side; the output end of the hydraulic pump, the output end of the driving engine and the output end of the generator motor 12 are all connected to the power distribution device 13, which is suitable for parallel hybrid excavator, realizes the generalization of components, flexible selection of various architectures, low manufacturing cost, short development cycle, stability and energy saving.

[0023] Specifically, the hydraulic pump adopts a hydraulic main pump 10 and a hydraulic auxiliary pump 11 to provide power for the hydraulic system, and the engine radiator 3 is used for heat dissipation, and the driving form of the heat dissipation fan of the engine radiator 3 can be engine direct drive, hydraulic motor drive or motor drive.

[0024] Specifically, the motor drive slewing system comprises a first drive slewing system 5 and a second drive slewing system 6, which can be directly driven by a motor, or driven by a "motor + speed reducer", or driven by a "motor + speed increaser".

[0025] Specifically, the generator motor 12 is also electrically connected to the power storage device 1 to charge the power storage device 1 when generating electricity; in addition to receiving power from the power distribution device 13, the motor drive slewing system is also connected to the power storage device 1 through a feedback circuit to recover energy and store it in the power storage device 1 when braking or decelerating.

[0026] Specifically, the power storage device 1 is erected on the oblique upper side of the driving engine 2 through a support assembly, which not only saves space, but also ensures stable power supply.

[0027] Specifically, the power storage device 1 adopts lithium battery or super capacitor, which can be freely selected, and in this embodiment, lithium battery is adopted to meet the power demand of the system and reduce the cost.

[0028] Specifically, the driving engine 2 adopts a fuel engine or a gas engine or a hydrogen engine, and in this embodiment, a fuel engine is adopted to provide reliable power support.

[0029] Specifically, the superframe 7 is installed with a fuel tank 8 and a hydraulic oil tank 9, which are arranged side by side to provide necessary fuel and hydraulic oil for the system, the fuel tank 8 is connected to the fuel engine, and the hydraulic oil tank 9 is connected to the hydraulic main pump 10 and the hydraulic auxiliary pump 11 through pipelines.

[0030] Specifically, the fuel tank 8 and the hydraulic oil tank 9 are arranged on one side of the upper frame 7, and a hydraulic oil radiator 4 is arranged on the other side of the frame, the hydraulic oil radiator 4 is arranged side by side with the engine radiator 3, and is responsible for the heat dissipation work of the system together.

[0031] Further, the variable speed connection device can realize different speeds of different components; especially, a high-speed motor driving system can be used; the high-speed motor system can be used in multiple platforms, can reduce the cost, and can improve the system efficiency.

[0032] Under the premise of not making great changes to the original platform, the parallel hybrid system is realized, the electric drive rotation system is realized, the electric drive of the heat dissipation fan can also be realized, the degree of component generalization is extremely high, the power generation motor does not need to be professionally customized and developed, the product development cycle is greatly shortened, and the product manufacturing cost is greatly reduced; by using the parallel hybrid system, the power system can supplement the power in the heavy load working condition, and the power system can generate electricity to absorb the power of the engine in the light load working condition, so that the engine can operate at a reduced power and a stable power, the cost can be further reduced, the oil consumption can be saved, and the user's income can be increased; at the same time, the electric drive rotation system can recover and reuse the braking energy of the rotation energy, which can further reduce the oil consumption, save energy and reduce emissions.

Claims

1. An excavator hybrid system, characterized by, The upper vehicle frame (7) is provided with an electric storage device (1), a motor drive rotation system and a power distribution device (13) for distributing power to the motor drive rotation system; the power distribution device (13) is provided with a hydraulic pump and a generator motor (12) on one side and a driving engine (2) and an engine radiator (3) on the other side; the output ends of the hydraulic pump, the driving engine and the generator motor (12) are connected to the power distribution device (13).

2. The excavator hybrid system of claim 1, wherein, The upper vehicle frame (7) is provided with a fuel tank (8) and a hydraulic oil tank (9), which are arranged side by side.

3. The excavator hybrid system of claim 2, wherein, The fuel tank (8) and the hydraulic oil tank (9) are arranged on one side of the upper vehicle frame (7), and the other side of the vehicle frame is provided with a hydraulic oil radiator (4).

4. The excavator hybrid system of claim 3, wherein, The hydraulic oil radiator (4) is arranged side by side with the engine radiator (3).

5. The excavator hybrid system of claim 1, wherein, The electric storage device (1) is arranged on the upper side of the driving engine (2) through a support assembly.

6. The excavator hybrid system of claim 1, wherein, The electric storage device (1) adopts lithium batteries or super capacitors.

7. The excavator hybrid system of claim 1, wherein, The driving engine (2) adopts a fuel engine or a gas engine or a hydrogen engine.

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