公开(公告)号：US20240280120A1

公开(公告)日：2024-08-22

申请号：US18648383

申请日：2024-04-28

Applicant: ZHEJIANG UNIVERSITY

Inventor： Chao ZHANG ,  Xiaolong ZHANG ,  Yu FANG ,  Huaizhi ZONG ,  Junhui ZHANG ,  Bing XU

IPC: F15B19/00 ,  F15B21/00

CPC classification number: F15B19/007 ,  F15B21/00

Abstract: Provided is a design method for a self-compensation structure of a cam-lobe hydraulic motor plate distribution system, which comprises that follow steps: firstly, establishing a force balance equation, a pressure distribution equation and a flow balance equation for each balance chamber, setting a boundary condition, and setting an expected nominal clearance; selecting a fit clearance for simultaneous solutions, and obtaining a set of solutions of areas; taking a maximum value in this set of solutions as the median, and setting a set of area values in the optimization design; further solving changing curves of the nominal clearance and the total leakage of the distribution system with the rotation angle of the cylinder block, and calculating the average value of various curves after the operation is smooth, and designing the self-compensation structure based on selection of the optimal combination of the fit clearance and area.

公开(公告)号：US20240280021A1

公开(公告)日：2024-08-22

申请号：US18648454

申请日：2024-04-28

Applicant: ZHEJIANG UNIVERSITY

Inventor： Bing XU ,  Xiaolong ZHANG ,  Huaizhi ZONG ,  Junhui ZHANG ,  Chao ZHANG ,  Yiming YUE ,  Danghui WANG

IPC: F01B31/12

CPC classification number: F01B31/12

Abstract: The present application discloses a testing device and a testing method for multiple piston assembly of a cam-lobe hydraulic motor. N cylinder blocks are installed on the cylinder block base, and piston assemblies to be tested are installed on the cylinder blocks. A driving plate is installed on the cylinder block base, and N uniformly-distributed driving plate clamping grooves are formed in the driving plate. A cylinder block protrusion is arranged at the bottom of each cylinder block, and the cylinder block protrusions are clamped in the driving plate clamping grooves. When the driving plate is rotated, the N driving plate clamping grooves drive the N cylinder blocks to rotate synchronously through the cylinder block protrusions, to synchronously change the pressure angle between a driving shaft and each piston assembly.

公开(公告)号：US20240141931A1

公开(公告)日：2024-05-02

申请号：US18408440

申请日：2024-01-09

Applicant: ZHEJIANG UNIVERSITY

Inventor： Bing XU ,  Xuguang LI ,  Junhui ZHANG ,  Huaizhi ZONG ,  Xinlei XU ,  Weidi HUANG

IPC: F15B19/00 ,  F15B13/04 ,  G01M3/32

CPC classification number: F15B19/005 ,  F15B13/0401 ,  G01M3/3236

Abstract: A constant value method for detecting and evaluating internal leakage in a hydraulic cylinder and a detection device. The method comprises: step (1) measuring an accurate pressure drop value Δp of the internal leakage in the hydraulic cylinder; step (2), determining whether the detected hydraulic cylinder meets a standard: if the product of the accurate pressure drop value Δp of the internal leakage in the hydraulic cylinder and a corresponding hydraulic stroke L, is less than a standard parameter C for evaluating the internal leakage in the hydraulic cylinder,





C
=


4
⁢
QtK


π
⁢

D
2




,




the internal leakage in me hydraulic cylinder meets the standard. Otherwise, the internal leakage in the hydraulic cylinder does not meet the standard. The detection device comprises a motor, a hydraulic pump, a directional valve, a detected part, a pipeline disassembly joint and a pressure sensor.

公开(公告)号：US20240077072A1

公开(公告)日：2024-03-07

申请号：US18508268

申请日：2023-11-14

Applicant: ZHEJIANG UNIVERSITY

Inventor： Junhui ZHANG ,  Bing XU ,  Qi ZHAO ,  Haogong XU ,  Weidi HUANG ,  Fei LYU

IPC: F04B51/00 ,  G01H11/02

CPC classification number: F04B51/00 ,  G01H11/02 ,  F04B2201/0802

Abstract: Provided is a dynamic characteristic measurement method for a cylinder block of a non-intrusive axial piston pump. The cylinder block is the main rotating component of the axial piston pump, and the dynamic characteristic of the cylinder block is more capable of reflecting the health condition of the pump than an external characteristic. A non-contact type measurement scheme is provided so as to reduce the influence of a measurement device on the motion of the cylinder block. Cylinder block contour signals and radial displacement signals are obtained by measuring the radial displacement of two sections of the surface of the cylinder block under different working conditions in the perpendicular directions, and then the cylinder block contour signals are accurately removed from the radial displacement signals to obtain the translational and tilting motion characteristics of the cylinder block.