A lightweight central rotary joint of stepped rotary body structure

Abstract

This utility model discloses a lightweight central rotary joint with a stepped rotary body structure, including a rotary shaft, a stepped rotary body, and an end cap. The rotary shaft has an axial oil inlet and a radial oil inlet; the outer wall of the rotary body is divided into a first step and a second step, and its inner wall is correspondingly provided with a first oil outlet and a second oil outlet, realizing optimized oil circuit partitioning; the inner wall of the rotary body has spaced annular grooves for installing oil seals, an O-ring seal is provided at the inlet end, and a sealing ring is added to the end face of the rotary shaft; the end cap and the rotary shaft are axially limited by a baffle. This structure solves the problems of low space utilization, large weight, and poor sealing reliability of traditional joints, and is suitable for compact rotating machinery hydraulic systems.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic transmission technology, specifically to a lightweight central rotary joint with a stepped rotating body structure. Background Technology

[0002] Hydraulic rotary joints, also known as center rotary joints or central rotary joints, are common in hydraulic systems. They are primarily used to transfer fluid between stationary and rotating parts of mechanical equipment, preventing interference between the rotating parts. They are frequently used in rotating machinery such as construction machinery and port machinery. The basic structure consists of a mandrel and a housing that rotates on the mandrel. Currently, the housing of common hydraulic rotary joints is a single, integral part. When there are many oil passages, the following drawbacks may occur:

[0003] 1. Rotary bodies typically use a single-diameter cylinder with uniformly sized internal annular oil passages. When the system needs to accommodate both high-flow (e.g., the main oil circuit of an actuator) and low-flow (e.g., the control oil circuit) oil passages, the large oil passages occupy excessive radial space, resulting in a bulky overall size.

[0004] 2. To meet strength requirements, the wall thickness of the entire rotating body must be designed according to the maximum oil passage pressure, resulting in material redundancy in non-high pressure areas and increasing energy consumption during equipment movement.

[0005] 3. The equal-diameter oil passage layout restricts the spacing between adjacent oil passages, and the oil seal mounting grooves are closely arranged. Under long-term rotation conditions, uneven surface pressure is easily caused by thermal deformation, resulting in hydraulic oil leakage. Utility Model Content

[0006] The purpose of this invention is to overcome the defects in the existing technology and provide a stepped rotating body structure that, while ensuring the sealing of multiple oil passages, optimizes the spatial layout through differentiated oil passage dimensions to achieve lightweight and precise flow matching.

[0007] To achieve the above objectives, the technical solution of this utility model is to design a lightweight central rotary joint with a stepped rotary body structure, including a rotary shaft, a rotary body, and an end cap. The rotary body is fitted onto the rotary shaft, and the end cap is connected to the end of the rotary body away from the rotary shaft. A baffle is provided between the end cap and the rotary shaft, and the baffle is connected to the rotary shaft by fasteners. The diameter of the baffle is larger than the diameter of the rotary shaft. The rotary shaft is a stepped shaft, and multiple oil inlet channels are provided along the axial direction on the periphery of the rotary shaft. One end of each oil inlet channel is connected to an oil inlet. Multiple annular oil outlet channels are provided on the inner wall of the rotary shaft, and the multiple annular oil outlet channels are respectively connected to the multiple oil inlet channels. The ends of the multiple annular oil outlet channels away from the oil inlet channels are connected to oil outlets. The outer wall of the rotary shaft is stepped, namely a first step and a second step. The inner diameters of the annular oil outlet channels at corresponding positions of the first step and the second step are different, namely the first oil outlet channel and the second oil outlet channel. By setting the rotating body in a stepped shape, placing the second oil outlet in the first stepped section of the rotating body, and placing the first oil outlet in the second stepped section of the rotating body, redundant materials are removed from the small-diameter first stepped section, reducing manufacturing costs and overall weight.

[0008] Furthermore, the inner wall of the rotating body is provided with multiple annular grooves, which are spaced apart from multiple annular oil outlets. An oil seal is installed within each annular groove. The oil seal effectively isolates two adjacent annular oil outlets, preventing oil leakage.

[0009] Furthermore, an O-ring is provided on the inner wall of the rotating body near the oil inlet, and an O-ring is installed inside the O-ring. The O-ring ensures the seal between the rotating body and the rotating shaft, preventing internal liquid leakage and external liquid intrusion.

[0010] Furthermore, the oil inlet is located on the side of the rotating shaft, and the axis of the oil inlet is perpendicular to the axis of the oil inlet channel. The side-mounted oil inlet accommodates more complex installation conditions.

[0011] Furthermore, a sealing ring is provided at the contact point between the stepped end face of the rotary shaft and the end face of the rotary body. The sealing ring ensures the seal between the contact surface of the rotary body and the rotary shaft, preventing internal liquid leakage and external liquid intrusion.

[0012] Furthermore, the end cap, baffle, and rotating body contact surfaces are provided with sealing rings.

[0013] The advantages and beneficial effects of this utility model are as follows:

[0014] 1. Large oil channels are concentrated in large-diameter steps, while small oil channels are distributed in small-diameter steps. The overall structure is stepped. Redundant materials are removed from the small-diameter step sections, reducing manufacturing costs and overall weight.

[0015] 2. The pressure drop in the first oil outlet channel is reduced, the flow rate in the second oil outlet channel is increased, the system response speed is optimized, and it can adapt to both high-flow and low-flow oil channels at the same time.

[0016] 3. The oil seal achieves a larger installation spacing in a small-diameter stepped manner, and when used with an O-ring to block the axial leakage path, the sealing effect is better. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural schematic diagram of the rotary joint of this utility model;

[0018] Figure 2 This is the main view of the rotary joint of this utility model;

[0019] Figure 3 This is a cross-sectional view of the rotary joint of this utility model.

[0020] In the diagram: 1. Rotary shaft; 100. Oil inlet; 101. Oil port; 2. Rotating body; 200. Annular oil outlet; 201. First oil outlet; 202. Second oil outlet; 210. Oil port; 211. First step; 212. Second step; 220. Annular groove; 221. Oil seal; 222. O-ring groove; 223. O-ring; 224. Sealing ring; 3. End cap; 4. Baffle. Detailed Implementation

[0021] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0022] according to Figures 1-3 As shown, this utility model is a lightweight central rotary joint with a stepped rotary body structure, including a rotary shaft 1, a rotary body 2, and an end cap 3. The rotary body 2 is mounted on the rotary shaft 1. The end cap 3 is connected to the end of the rotary body 2 away from the rotary shaft 1. A baffle 4 is provided between the end cap 3 and the rotary shaft 1. The baffle 4 is connected to the rotary shaft 1 by fasteners. The diameter of the baffle 4 is larger than the diameter of the rotary shaft 1. The rotary shaft 1 is a stepped shaft. Multiple oil inlet channels 100 are provided axially around the periphery of the rotary shaft 1. One end of each oil inlet channel 100 is connected to... The rotating body 2 is equipped with an oil inlet 101 and has multiple annular oil outlet channels 200 on its inner wall. The multiple annular oil outlet channels 200 are connected to multiple oil inlets 100 respectively. The ends of the multiple annular oil outlet channels 200 away from the oil inlets 100 are connected to oil outlets 210. The outer wall of the rotating body 2 is stepped, with a first step 211 and a second step 212. The annular oil outlet channels 200 at corresponding positions of the first step 211 and the second step 212 have different inner diameters, namely the first oil outlet channel 201 and the second oil outlet channel 202.

[0023] Based on the traditional central rotary joint, this utility model designs the outer wall of the rotary body 2 as a stepped shape, and opens a first oil outlet channel 201 and a second oil outlet channel 202 with different inner diameters in the first step 211 and the second step 212, thereby realizing the removal of redundant materials in the small-diameter stepped section, and increasing the flow rate of the second oil outlet channel 202, thus improving the system response speed.

[0024] Specifically, the inner wall of the rotating body 2 is provided with a plurality of annular grooves 220, the plurality of annular grooves 220 and the plurality of annular oil outlets 200 are spaced apart, and an oil seal 221 is provided in the annular grooves 220.

[0025] Specifically, an O-shaped groove 222 is provided on the inner wall of the rotating body 2 near the oil inlet 101, and an O-ring 223 is provided in the O-shaped groove 222.

[0026] Specifically, the oil inlet 101 is located on the side of the rotating shaft 1, and the axis of the oil inlet 101 is perpendicular to the axis of the oil inlet channel 100.

[0027] Specifically, a sealing ring 224 is provided at the contact point between the stepped end face of the rotary shaft 1 and the end face of the rotary body 2.

[0028] Specifically, the contact surfaces of the end cap 3, the baffle 4, and the rotating body 2 are provided with sealing rings 224.

[0029] The specific working principle is as follows:

[0030] The rotating shaft 1 is fixed to the stationary part of the equipment, and the rotating body 2 rotates with the rotating parts of the equipment. Oil enters the axial oil inlet 100 from the radial oil inlet 101 on the side of the rotating shaft 1. The oil flows through the oil inlet 100 into the annular oil outlet 200 on the inner wall of the rotating body 2, and finally exits from the oil outlet 210 at the end of the annular oil outlet 200 to the actuator. The high-flow-rate oil path is located in the large-diameter section of the second step 212, and the inner diameter of the first oil outlet 201 is relatively large, reducing oil pressure drop and adapting to the main oil path requirements. The low-flow-rate oil path is located in the small-diameter section of the first step 211, and the inner diameter of the second oil outlet 202 is relatively small, increasing the oil flow rate and optimizing the response speed of the control oil path. An oil seal 221 is installed in the annular groove 220 on the inner wall of the rotating body 2 to isolate adjacent oil paths and prevent oil leakage. An O-ring 223 is placed in the O-ring groove 222 near the oil inlet 101 to block the axial leakage path. The sealing ring 224 is located at the contact point between the stepped end face of the rotating shaft 1 and the rotating body 2, enhancing the end face seal. The diameter of the baffle 4 is larger than the diameter of the rotating shaft 1. The baffle 4 is fixed to the rotating shaft 1 by fasteners, limiting the axial displacement of the rotating shaft 1 and ensuring uniform pressure on the seal. The stepped structure increases the oil passage spacing, especially in the small diameter section, reducing uneven sealing caused by thermal deformation and improving long-term sealing reliability.

[0031] The fluids mentioned above, besides hydraulic oil, can also be water, polishing fluid, or other liquids required for equipment production, processing, and operation.

[0032] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A lightweight central rotary joint of a stepped rotary structure, characterized by, The assembly includes a rotating shaft (1), a rotating body (2), an end cap (3), and a baffle (4). The rotating body (2) is mounted on the rotating shaft (1). The end cap (3) is connected to the end of the rotating body (2) away from the rotating shaft (1). A baffle (4) is provided between the end cap (3) and the rotating shaft (1). The baffle (4) is connected to the rotating shaft (1) by fasteners. The diameter of the baffle (4) is larger than the diameter of the rotating shaft (1). The rotating shaft (1) is a stepped shaft. Multiple oil inlets (100) are provided axially around the rotating shaft (1). One end of each oil inlet (100) is connected to an oil inlet (10). 1) The inner wall of the rotating body (2) is provided with a plurality of annular oil outlet channels (200), which are respectively connected to a plurality of oil inlet channels (100). The ends of the plurality of annular oil outlet channels (200) away from the oil inlet channels (100) are connected to oil outlets (210). The outer wall of the rotating body (2) is stepped, namely a first step (211) and a second step (212). The inner diameters of the annular oil outlet channels (200) at corresponding positions of the first step (211) and the second step (212) are different, namely the first oil outlet channel (201) and the second oil outlet channel (202).

2. A lightweight central rotary joint of stepped rotary structure according to claim 1, characterized in that, The inner wall of the rotating body (2) is provided with a plurality of annular grooves (220), the plurality of annular grooves (220) are spaced apart from a plurality of annular oil outlets (200), and an oil seal (221) is provided in the annular grooves (220).

3. A lightweight central rotary joint of stepped rotary structure according to claim 2, characterized in that, An O-shaped groove (222) is provided on the inner wall of the rotating body (2) near the oil inlet (101), and an O-ring (223) is provided in the O-shaped groove (222).

4. The lightweight central rotary joint with a stepped rotating body structure according to claim 1, characterized in that, The oil inlet (101) is located on the side of the rotating shaft (1), and the axis of the oil inlet (101) is perpendicular to the axis of the oil inlet channel (100).

5. A lightweight central rotary joint with a stepped rotating body structure according to claim 1, characterized in that, A sealing ring (224) is provided at the contact point between the stepped end face of the rotating shaft (1) and the end face of the rotating body (2).

6. A lightweight central rotary joint with a stepped rotating body structure according to claim 1, characterized in that, The end cap (3), baffle (4) and rotating body (2) are provided with sealing rings (224).

Images