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CN-224214467-U - Axial integrated compact power unit and electrohydraulic actuator

CN224214467UCN 224214467 UCN224214467 UCN 224214467UCN-224214467-U

Abstract

The utility model discloses an axial integrated compact power unit and an electrohydraulic actuator, which comprise a motor component, a plunger pump component, a connecting valve block and an oil tank, wherein the connecting valve block is arranged between the motor component and the plunger pump component, one end of the connecting valve block seals the motor component shell, the other end of the connecting valve block seals the plunger pump component shell and the oil tank, the connecting valve block is provided with a bearing for supporting the front end of a rotating shaft and is provided with a shaft seal for sealing oil, the rotating shaft of the motor component penetrates through the connecting valve block to extend out to form a shaft extending end, the shaft extending end is directly inserted into a central hole of a cylinder body, the shaft extending end cantilever of the rotating shaft supports the cylinder body and drives the cylinder body to synchronously operate through a key, the cylinder body is abutted on a valve plate under the action of hydraulic pressure, and the valve plate supports the connecting valve block is provided with a flow distribution window, an oil duct and a control valve block for outwards conveying and receiving the oil. The power unit has the advantages of compact structure, high power density and low manufacturing cost.

Inventors

  • ZHONG BIAO
  • TIAN YUNTAO
  • YANG BO

Assignees

  • 上海强田驱动技术有限公司

Dates

Publication Date
20260508
Application Date
20240105

Claims (12)

  1. 1. An axial integrated compact power unit comprising: The front end of a rotating shaft (10) of the motor assembly (1) is supported on the connecting valve block (3) and penetrates through the connecting valve block (3) to form a shaft extending end; The plunger pump assembly (4) comprises a pump shell, a flow distribution pair, a plunger (70) pair and a sliding disc pair are arranged in the pump shell, the pump shell and the flow distribution pair of the plunger pump assembly (4) are connected with the connecting valve block (3), the plunger (70) pair comprises a cylinder body (80) and a plurality of plungers (70), one end of each plunger (70) is matched with the cylinder body (80), the other end of each plunger (70) is matched with the sliding disc pair, the shaft extension end is connected in a cantilever state and supports the cylinder body (80), and the shaft extension end is matched with the cylinder body (80) to drive the plunger (70) to rotate so as to realize reciprocating motion of the plunger (70) to absorb oil and pressure oil; The connecting valve block (3) is arranged between the motor assembly (1) and the plunger pump assembly (4), one side surface of the connecting valve block (3) is used for sealing a shell of the motor assembly (1), the other side surface is used for sealing a pump shell and an oil tank (5) of the plunger pump assembly (4), and a flow distribution window, an oil duct and a control valve group are arranged on the connecting valve block (3) and are used for conveying and receiving oil outwards; The oil tank (5) is used for containing hydraulic oil and the plunger pump assembly (4), the shaft extension end stretches into the oil tank (5) and the plunger pump assembly (4) is located in the oil tank (5) and immersed by the hydraulic oil, and the pump shell is provided with an oil port communicated with the oil tank (5).
  2. 2. The axial integrated compact power unit according to claim 1, wherein the motor assembly (1) comprises a motor housing, one end of the motor housing is matched and sealed through a motor end cover, the other end of the motor housing is connected with a valve block (3) and matched and sealed, the rotating shaft (10) extends from the inside to the outside of the motor housing, the rotating shaft (10) is matched and connected with a rotor assembly, the inner surface of the motor housing is provided with a stator assembly matched with the rotor assembly correspondingly, the rear part of the rotating shaft (10) is matched with the motor housing through a second bearing, and the front part of the rotating shaft (10) is matched with the connecting valve block (3) through a first bearing.
  3. 3. The axial integrated compact power unit according to claim 1 or 2, wherein an oil seal assembly is arranged between the rotating shaft (10) and the connecting valve block (3), and the oil seal assembly is used for preventing hydraulic oil from entering the motor assembly (1).
  4. 4. An axial integrated compact power unit according to claim 1 or 2, characterized in that a third bearing is arranged between the rotating shaft (10) and the connecting valve block (3).
  5. 5. The axially integrated compact power unit according to claim 1, wherein the connecting valve block (3) is provided with a connecting boss (301), a flow distribution pair of the plunger pump assembly (4) is in tight fit with the end face of the connecting boss (301), a flow distribution plate (90) face of the flow distribution pair is attached to the end face of the connecting boss (301) and communicated with a flow distribution window of the connecting boss (301), and an opening formed at the front end of a pump housing of the plunger pump assembly (4) is matched and fixed with the side surface of the connecting boss (301).
  6. 6. The axial integrated compact power unit of claim 1, wherein the slide plate pair comprises a swash plate and a slide plate supported on the swash plate, the plunger (70) is connected to the slide plate through a pressure plate (60), plunger ball sockets (58) which are in one-to-one correspondence with the plunger (70) are arranged on the front end face of the slide plate, the plunger ball sockets (58) penetrate to the rear end face of the slide plate through a central oil hole and a slide plate kidney-shaped hole, a sealing structure and an oil drainage structure are further arranged on the rear end face of the slide plate, the pressure plate (60) is arranged on the front end face of the slide plate in a manner of being attached to the front end face of the slide plate and is provided with pressure plate (60) holes corresponding to the plunger ball sockets (58), and the pressure plate (60) holes are matched with the plunger (70) so that the end parts of the plunger (70) are always located in the plunger ball sockets (58).
  7. 7. The axially integrated compact power unit according to claim 6, wherein the pressure plate (60) and the slide plate are connected and matched with the swash plate through a fastening structure, the fastening structure comprises a fastening piece, the fastening piece is provided with a limiting plate part, a rotary matching part, a fastening piece positioning part and a fastening piece connecting part, the limiting plate part is matched with the pressure plate (60) to enable the slide plate to keep fit with the swash plate, the slide plate is rotatably supported on the rotary matching part, the fastening piece positioning part is inserted into a central positioning hole of the swash plate, the fastening piece connecting part is connected with the central connecting hole of the swash plate, a fastening piece limiting end face is arranged between the rotary matching part and the fastening piece positioning part, and the fastening piece limiting end face is abutted against the swash plate supporting surface.
  8. 8. The axially integrated compact power unit of claim 6, wherein the pressure plate (60) and the slide plate are in connection and fit with the swash plate through a tightening structure, the tightening structure comprises a tightening piece, a tightening piece bolt, a tightening piece disc spring and a tightening piece limiting pin, the tightening piece comprises a limiting plate part, a rotary fit part and a tightening piece positioning part, the tightening piece disc spring is arranged between the tightening piece bolt and the limiting plate, and the tightening piece limiting pin is arranged between the tightening piece positioning part and the swash plate and is used for keeping the tightening piece circumferentially fixed, and the tightening piece bolt penetrates through the tightening piece and is fixedly connected with the swash plate.
  9. 9. The axially integrated compact power unit of claim 1, wherein the cylinder (80) is provided with a rotation center hole for connecting the shaft extension end, the shaft extension end penetrates through the rotation center hole, the end part of the shaft extension end is provided with a fastener and a blocking piece, an elastic pre-tightening piece is arranged between the blocking piece and the cylinder (80), and the elastic pre-tightening piece applies elastic pre-tightening force to the cylinder (80) and enables the cylinder (80) and the flow distribution pair to abut against the connecting valve block (3).
  10. 10. An electrohydraulic actuator comprising the axial integrated compact power unit of any one of claims 1-9 is characterized by comprising a hydraulic cylinder assembly (6), wherein the hydraulic cylinder assembly (6) is communicated with the power unit in a matched mode, the hydraulic cylinder assembly (6) comprises a cylinder barrel (6 a) and a piston rod (6 b) which are matched with each other, one end of the cylinder barrel (6 a) is provided with a connecting block (6 e) and is connected with a connecting valve block (3), the piston rod (6 b) divides the cylinder barrel (6 a) into two action cavities at intervals, oil ports are formed in the two action cavities, and an oil duct of the connecting valve block (3) extends to the connecting block (6 e) and is respectively communicated with the oil ports of the two action cavities.
  11. 11. The electro-hydraulic actuator of claim 10, wherein the motor assembly (1) is a servo motor and is cooperatively connected with the driver and the controller (2), and the servo motor is used for cooperatively controlling the variable speed volume of the plunger pump assembly (4) by the driver and the controller (2) so as to adjust the flow rate of the output oil.
  12. 12. The electro-hydraulic actuator according to claim 10 or 11, wherein the motor assembly (1) adopts a servo motor with dual functions of power generation and driving, the plunger pump assembly (4) adopts a bidirectional four-quadrant plunger (70) pump, the plunger pump assembly (4) works in a pump working condition or a motor working condition, the servo motor assembly (1) works in a driving working condition when the plunger pump assembly (4) works in the pump working condition, and the servo motor assembly (1) works in a power generation working condition when the plunger pump assembly (4) works in the motor working condition.

Description

Axial integrated compact power unit and electrohydraulic actuator Technical Field The utility model belongs to the technical field of hydraulic transmission and control, and particularly relates to an axial integrated compact power unit and an electrohydraulic actuator. Background The existing hydraulic system mostly adopts a centralized valve control system, and has the advantages of quick response and high precision, but also has the problems of large throttling loss, low system efficiency, more and complex pipelines, serious system heating and the like. For example, a driving system of an engine-variable pump-multiple-way valve-actuator or a driving system of an electric motor-variable pump-multiple-way valve-actuator is adopted, a hydraulic pump is driven by the engine or the electric motor, hydraulic energy is distributed to each actuator by the multiple-way valve, and the traditional hydraulic system has the following characteristics: (1) The existing centralized hydraulic system is based on an open valve control principle, a large amount of energy is consumed on a throttle orifice and overflow, and meanwhile, a large amount of along-distance loss and local loss exist in the process, namely, a pipeline part, pressure loss caused by a hydraulic valve and the like, the overall efficiency of the hydraulic system is about 30%, and the large amount of hydraulic energy is converted into heat energy after being lost to cause the system to generate heat, so that the system efficiency is lower. (2) The existing centralized hydraulic system driving system has the defects that the centralized oil supply pressure driving pipeline is long, the oil consumption is large, an additional oil tank and a cooling device are needed, and the volume and the cost of the system are further increased. (3) The traditional hydraulic power system has the advantages of huge volume, not compact structure, large vibration and noise, more connecting pipelines and interfaces, easy oil leakage and environmental pollution. Distributed pump-controlled hydraulic systems are emerging hydraulic systems in recent years, and particularly with the development of electric power, the distributed pump-controlled hydraulic systems will become an important technical development trend matching with the development of electric power in the future. The most important carrier of the distributed pump control hydraulic system is an electro-hydrostatic actuator (EHA), which integrates a motor, a hydraulic pump and an oil tank and directly adopts the pump control actuator. The Electro Hydrostatic Actuator (EHA) embodies the large direction of high fusion and integration of the hydraulic element and the electric control of the motor, and can fully exert the control advantages of the hydraulic high power-to-weight ratio and the electric control of the electric power. The core component of an electro-hydrostatic actuator (EHA) is a power unit for providing hydraulic power, and the following problems mainly exist at present: (1) The existing electro-hydrostatic actuator (EHA) power unit part is formed by simply connecting a motor, a hydraulic pump, a coupler, an oil tank, a hydraulic valve and the like in series-parallel connection, the integration degree is low, each part occupies a large volume space, the weight is large, and the whole power weight is low. (2) Most of hydraulic pumps used in the existing electro-hydrostatic actuator (EHA) power units are gear pumps, the working pressure of the hydraulic pumps is generally lower than the medium pressure, meanwhile, the low-speed performance of the gear pumps is poor, and the noise is large, so that the requirements of good matching of electro-hydraulic performance, high-pressure working conditions and low noise under the electric trend are difficult to meet. (3) The plunger pump used in the existing electro-hydrostatic actuator (EHA) power unit is generally a sliding shoe type swash plate plunger pump, and the plunger pump has unbalanced force and moment due to the natural defects of the structural design, so that the problems of lateral force overturning, abrasion, tray burning and the like are easily caused by friction pairs, and particularly under the condition of being matched with a high-speed motor, the abrasion failure of the plunger pump is more serious, and meanwhile, the adopted sliding shoe type plunger pump is poor in high-speed and low-speed performance and cannot be matched with the wide rotating speed working condition of the motor. It can be seen that there is still a need for improvement in current electrohydraulic power units and electrohydraulic actuators, which should be optimized to overcome the drawbacks of the prior art. Disclosure of utility model The utility model discloses an axial integrated compact power unit and an electrohydraulic actuator, and aims to provide a novel power unit and an electrohydraulic actuator which have the advantages of compact structure, small volume, light we