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CN-224229015-U - Hydraulic power source, hydraulic system and working machine

CN224229015UCN 224229015 UCN224229015 UCN 224229015UCN-224229015-U

Abstract

The utility model belongs to the technical field of hydraulic transmission, and discloses a hydraulic power source, a hydraulic system and a working machine, wherein the hydraulic power source comprises a motor unit, a pump unit and a pressurizing unit, the pump unit and the pressurizing unit are coaxially arranged on an output shaft of the motor unit and are respectively in transmission connection with the output shaft, the pump unit is provided with an oil suction port and an oil outlet, the pressurizing unit is provided with a pressurizing working cavity and a pressurizing inlet of the pressurizing working cavity, and the pressurizing working cavity is communicated with the oil suction port. The hydraulic power source is characterized in that the pump unit and the pressurizing unit are coaxially connected to the output shaft of the motor unit, and the operation of the pump unit and the pressurizing at the oil suction port can be realized only by means of self power.

Inventors

  • WANG YIXUAN
  • CHENG QIAN
  • WANG WEI
  • YIN LI
  • GUO JIDONG
  • CHEN YIHONG

Assignees

  • 中联重科股份有限公司

Dates

Publication Date
20260512
Application Date
20250521

Claims (10)

  1. 1. A hydraulic power source, characterized in that the hydraulic power source comprises a motor unit (1), a pump unit (2) and a pressurizing unit (3); The pump unit (2) and the pressurizing unit (3) are coaxially arranged on an output shaft (121) of the motor unit (1) and are respectively connected with the output shaft (121) in a transmission manner; The pump unit (2) is provided with an oil suction port (2 a) and an oil outlet (2 b), the pressurizing unit (3) is provided with a pressurizing working cavity and a pressurizing inlet (3 a) of the pressurizing working cavity, and the pressurizing working cavity is communicated with the oil suction port (2 a).
  2. 2. The hydraulic power source according to claim 1, characterized in that the pump unit (2) is mounted at an axial end of the motor unit (1), the pressurizing unit (3) is mounted at a side of the pump unit (2) facing away from the motor unit (1), and the output shaft (121) axially penetrates the pump unit (2) and is connected with the pressurizing unit (3).
  3. 3. The hydraulic power source according to claim 2, characterized in that the booster unit (3) comprises a booster housing (31) and a turbine (32), the booster housing (31) is mounted on the side of the pump unit (2) facing away from the motor unit (1), a booster working chamber and a booster inlet (3 a) are arranged in the booster housing (31), the output shaft (121) penetrates the pump unit (2) and extends into the booster working chamber, and the turbine (32) is arranged in the booster working chamber and is in transmission connection with the output shaft (121).
  4. 4. A hydraulic power source according to claim 3, characterized in that the supercharging unit (3) further comprises an inducer (33) arranged at the supercharging inlet (3 a), the inducer (33) being in driving connection with the output shaft (121) extending into the supercharging working chamber and being arranged to direct hydraulic oil at the supercharging inlet (3 a) to the supercharging working chamber.
  5. 5. The hydraulic power source according to claim 4, characterized in that the turbine (32) is a centrifugal wheel, the inducer (33) includes a body portion and a spiral guide vane (331) provided on an outer peripheral wall of the body portion, the body portion is arranged coaxially with the turbine (32), and the spiral guide vane (331) is for guiding hydraulic oil to flow toward an axial center of the turbine (32).
  6. 6. The hydraulic power source according to claim 2, characterized in that the pump unit (2) is a rotary pump and comprises a pump housing (21) mounted at one axial end of the motor unit (1) and a rotary member (22) arranged in the pump housing (21), the pump housing (21) is provided with the oil suction port (2 a) and the oil outlet port (2 b), and the output shaft (121) penetrates the pump housing (21) and is in driving connection with the rotary member (22) in the pump housing (21).
  7. 7. The hydraulic power source according to any one of claims 1 to 6, characterized in that the motor unit (1) comprises a housing (11) and an armature assembly (12) arranged in a hollow cavity (1 a) of the housing (11), a cooling oil duct (1 b) and an external oil outlet (1 c) are further arranged on a housing wall of the housing (11), the cooling oil duct (1 b) is positioned radially outside the hollow cavity (1 a) and extends along an axial direction of the housing (11), and the cooling oil duct (1 b) is isolated from the hollow cavity (1 a); The oil outlet (2 b), the cooling oil duct (1 b) and the external oil outlet (1 c) are sequentially communicated.
  8. 8. The hydraulic power source according to claim 7, characterized in that the motor unit (1) further comprises a cooling fan (124) arranged in the hollow cavity (1 a), the cooling fan (124) being located on the axial side of the armature assembly (12) and being in driving connection with the output shaft (121).
  9. 9. A hydraulic system comprising a hydraulic power source according to any one of claims 1 to 8.
  10. 10. A work machine comprising a hydraulic system according to claim 9.

Description

Hydraulic power source, hydraulic system and working machine Technical Field The utility model belongs to the technical field of hydraulic transmission, and particularly relates to a hydraulic power source, a hydraulic system and a working machine. Background The hydraulic transmission technology has the characteristics of high power density, quick dynamic response, high reliability and the like, is widely applied to the working machinery, and is a great trend of the development of the current hydraulic technology along with the vigorous development of the new energy technology. The electric drive of the hydraulic power source refers to the use of a motor to drive the hydraulic pump to work, but in the transmission framework, the high-efficiency rotating speed interval of the motor is generally above 3000rpm, and most of rated working rotating speeds of the conventional hydraulic pump are not more than 3000rpm, when the motor is connected with the hydraulic pump, the motor drives the hydraulic pump to operate at a high speed, the insufficient oil absorption of the hydraulic pump is easily caused, and the conditions of serious cavitation in the hydraulic pump, low volumetric efficiency of the hydraulic pump, unstable output pressure of the hydraulic pump and the like are caused. Disclosure of utility model Aiming at the defects or shortcomings, the utility model provides a hydraulic power source, a hydraulic system and a working machine, and aims to solve the technical problems of low volumetric efficiency and poor output pressure stability of the existing electric drive type hydraulic power source. In order to achieve the above purpose, the utility model provides a hydraulic power source, which comprises a motor unit, a pump unit and a pressurizing unit, wherein the pump unit and the pressurizing unit are coaxially arranged on an output shaft of the motor unit and are respectively connected with the output shaft in a transmission way, the pump unit is provided with an oil suction port and an oil outlet, the pressurizing unit is provided with a pressurizing working cavity and a pressurizing inlet of the pressurizing working cavity, and the pressurizing working cavity is communicated with the oil suction port. In an embodiment of the utility model, the pump unit may be mounted at an axial end of the motor unit, the pressurizing unit is mounted at a side of the pump unit facing away from the motor unit, and the output shaft axially penetrates the pump unit and is connected with the pressurizing unit. In the embodiment of the utility model, the booster unit comprises a booster shell and a turbine, the booster shell is arranged on one side of the pump unit, which is opposite to the motor unit, a booster working cavity and a booster inlet are arranged in the booster shell, the output shaft penetrates through the pump unit and extends into the booster working cavity, and the turbine is arranged in the booster working cavity and is in transmission connection with the output shaft. In an embodiment of the utility model, the pressurizing unit further comprises an inducer arranged at the pressurizing inlet, the inducer is in transmission connection with the output shaft extending into the pressurizing working chamber and used for guiding hydraulic oil at the pressurizing inlet to flow to the pressurizing working chamber. In an embodiment of the utility model, the turbine is a centrifugal wheel, and the inducer comprises a body portion and helical guide blades provided on an outer peripheral wall of the body portion, the body portion being arranged coaxially with the turbine, the helical guide blades being for guiding hydraulic oil to flow toward an axial center of the turbine. In the embodiment of the utility model, the pump unit is a rotary pump and comprises a pump shell arranged at one axial end of the motor unit and a rotary part arranged in the pump shell, an oil suction port and an oil outlet are arranged on the pump shell, and an output shaft penetrates the pump shell and is in transmission connection with the rotary part in the pump shell. In the embodiment of the utility model, the motor unit comprises a shell and an armature assembly arranged in a hollow cavity of the shell, a cooling oil duct and an external oil outlet are further arranged on the shell wall of the shell, the cooling oil duct is positioned on the radial outer side of the hollow cavity and extends along the axial direction of the shell, the cooling oil duct is isolated from the hollow cavity, and the oil outlet, the cooling oil duct and the external oil outlet are sequentially communicated. In an embodiment of the utility model, the motor unit further comprises a cooling fan arranged in the hollow cavity, the cooling fan being located on an axial side of the armature assembly and being in driving connection with the output shaft. To achieve the above object, the present utility model also provides a hydraulic system, wherein the hydraulic sys