Multifunctional connector special for oil discharge of HST shell

Abstract

The utility model relates to a multifunctional joint specially matched for oil discharge of an HST shell, which comprises a cavity, a first channel, a second channel and a third channel which are communicated with one another are arranged in the cavity, the first channel is used for being connected with the HST shell, the second channel is connected with a radiator, and the third channel is connected with an oil return tank. According to the utility model, the technical problems of oil seal damage and radiator breakage caused by unsmooth oil return and system pressure rise of the HST hydraulic system due to the blockage of the radiator are solved.

Description

Technical Field

[0001] This utility model is a multi-functional connector specifically designed for oil unloading from HST housings. Background Technology

[0002] In the field of agricultural machinery, hydraulic drive technology has been widely used in small and medium-sized mechanical equipment, especially hydraulic static transmission systems, which have become one of the mainstream configurations due to their compact structure, high transmission efficiency, and ability to achieve stepless speed regulation. HST hydraulic continuously variable transmissions typically consist of a variable displacement pump, a fixed displacement motor, and a replenishing pump, forming a closed-loop hydraulic circulation system to achieve efficient power transmission to the drive wheels.

[0003] In this closed-loop system, hydraulic oil circulates under high pressure and high temperature conditions, generating a significant amount of heat during operation. To ensure the hydraulic oil temperature remains within a reasonable range, the HST system typically uses a radiator connected to the housing for oil discharge, maintaining thermal balance and normal operation. However, during actual operation, the radiator is prone to blockage by dust, weeds, and other external impurities, leading to poor oil return and increased system return pressure. When the system pressure exceeds the normal operating range, it can damage the HST housing oil seal and even cause serious malfunctions such as radiator rupture, directly impacting the overall operational safety and reliability of the machine.

[0004] Therefore, addressing the heat dissipation reliability issues of existing HST hydraulic systems in agricultural machinery applications, there is an urgent need to propose improvement schemes in system structure optimization and key component design to enhance the operational stability and fault protection capabilities of the overall hydraulic system. The existence of these problems also provides the technical background and practical need for the proposal of this invention. Utility Model Content:

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a multi-functional connector specifically designed for oil unloading from HST housings.

[0006] A multi-functional connector specifically designed for unloading oil from an HST housing includes a cavity with interconnected first, second, and third channels inside. The first channel is used to connect to the HST housing, the second channel is connected to the radiator, and the third channel is connected to the return oil tank.

[0007] Furthermore, the third channel is equipped with a one-way valve structure.

[0008] Furthermore, the one-way valve structure includes a spring and a plug. The two ends of the spring abut against the plug and the spring seat, respectively. The spring seat is connected to the inner wall of the third channel. The inner wall of the third channel has a stepped structure, and the plug is movably positioned at the interface between the two steps.

[0009] Furthermore, the interface between the two steps is a slope.

[0010] Furthermore, a baffle is embedded in the inner wall of the third channel, and a spring seat is supported on the baffle.

[0011] Furthermore, the plug is spherical in shape.

[0012] Beneficial effects: Compared with the prior art, the present invention has the following advantages:

[0013] A dedicated multi-functional connector replaces the traditional design where the HST housing's oil drain port is directly connected to the radiator, fundamentally optimizing the oil flow path and system safety mechanisms. The multi-functional connector features interconnected first (Port A), second (Port B), and third (Port C) channels, connecting to the HST housing, radiator, and return tank, respectively. The third channel incorporates a one-way valve structure for flow direction control.

[0014] Under normal system conditions, the hot oil discharged from the HST housing enters the connector through the first channel, flows to the radiator through the second channel for cooling, and finally flows back to the oil tank, achieving thermal balance and normal circulation of the hydraulic oil.

[0015] When the return oil system becomes blocked (e.g., the return oil line is blocked by foreign objects), the oil pressure in the system rises rapidly. At this time, the one-way valve structure in the third channel automatically opens after overcoming the preset spring force, allowing the hot oil to bypass the radiator and flow directly from port C to the oil tank, effectively avoiding malfunctions such as damage to the HST seal or radiator bursting caused by pressure accumulation.

[0016] Furthermore, the overall structure of the connector features an adjustable design, allowing for flexible adjustment of the channel direction according to the overall layout, thus improving the convenience of pipeline installation. Integrating the one-way valve outlet with the long port further simplifies the structure and improves the system's reliability and anti-clogging capability. After thermal equilibrium is disrupted, operators can quickly locate the blockage and perform repairs or unblocking by detecting system anomalies, improving maintenance efficiency. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of the internal structure of the multi-functional connector;

[0018] Figure 2 This is a magnified view of a portion (one-way valve structure) at point E in Figure E;

[0019] In the diagram, 1 is the first channel, 2 is the second channel, 3 is the third channel, 4 is the plug, 5 is the interface, 6 is the spring, 7 is the spring seat, and 8 is the baffle. Detailed Implementation

[0020] To enhance understanding of this utility model, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. These embodiments are only used to explain the present utility model and do not constitute a limitation on the scope of protection of the present utility model.

[0021] A multi-functional connector specifically designed for unloading oil from an HST housing includes a cavity with interconnected first channel 1, second channel 2, and third channel 3 inside. The first channel 1 is used to connect to the HST housing, the second channel 2 is connected to the radiator, and the third channel 3 is connected to the return oil tank.

[0022] This embodiment achieves hydraulic oil flow between the HST housing, radiator, and return oil tank by designing three interconnected channels inside the cavity. The first channel 1 serves as a reliable interface connected to the HST housing's oil port, allowing for smooth oil outflow from the HST. The second channel 2 leads to the radiator, cooling the high-temperature oil. The third channel 3 connects to the return oil tank, facilitating the return of cooled oil. The interconnected design of the three channels ensures smooth oil flow under controlled pressure, enabling unified regulation of oil circulation and unloading operations. The overall structure is compact, facilitating integrated installation.

[0023] This multi-functional connector integrates the HST housing's oil unloading, heat dissipation, and oil return functions, significantly reducing the piping layout required by multiple separate connectors in traditional structures, thus lowering connection complexity and assembly difficulty. The integrated channel structure effectively improves oil circulation efficiency and enhances system heat dissipation. Furthermore, the unified cavity structure improves system sealing, reduces leakage risk, and enhances reliability.

[0024] In one possible implementation, the third channel 3 is provided with a one-way valve structure.

[0025] In the aforementioned multi-functional connector structure, a one-way valve is installed inside the third channel 3 to control the unidirectional flow of the oil. When the oil flows from the radiator through the second channel 2 to the return oil tank, the one-way valve is opened by pressure, allowing the oil to flow. When the pressure in the return oil tank increases or a backflow tendency occurs, the one-way valve automatically closes, effectively preventing the oil from flowing backward into the radiator or HST housing, thus avoiding system failure and energy waste.

[0026] By integrating a one-way valve structure into the third channel 3, the system's flow control capability can be effectively improved, avoiding backflow risks and ensuring the stability and safety of system operation. Simultaneously, this design achieves passive opening and closing without an external control system, reducing energy consumption and maintenance costs, and enhancing the structure's autonomous adjustment capability.

[0027] In one possible implementation, the one-way valve structure includes a spring 6 and a plug 4. The two ends of the spring 6 abut against the plug 4 and the spring seat 7, respectively. The spring seat 7 is connected to the inner wall of the third channel 3. The inner wall of the third channel 3 has a stepped structure. The plug 4 is movably positioned at the interface 5 of the two steps.

[0028] In this embodiment, the one-way valve structure provides an initial preload force via spring 6, pressing the plug 4 against the stepped interface 5 to form a seal. When the oil pressure exceeds the preload force of spring 6, the plug 4 moves axially along the channel under pressure, thereby opening the channel; once the oil pressure decreases or a backflow tendency occurs, spring 6 automatically pushes the plug 4 back to its original position, closing the channel. The stepped structure provides reliable guidance and positioning functions, making the operation of the plug 4 more stable and reliable.

[0029] This structural design combines reliable sealing with sensitive opening and closing, enabling precise control of unidirectional oil flow and reducing energy loss and component wear. Simultaneously, the stepped structure provides physical restraint on the movement of the plug 4, preventing displacement or jamming and improving overall service life and operational stability.

[0030] In one possible implementation, the interface 5 between the two steps is an inclined plane.

[0031] Designing the step interface 5 as a slope provides a smoother contact transition during the movement of the plug 4, which helps the plug 4 slide stably and automatically position itself. The sloped design also reduces the local impact force on the plug 4, enhances its synergy with the spring 6, and improves the flexible response characteristics of the system's opening and closing.

[0032] The beveled design improves the dynamic response of the plug 4 movement, reduces wear between the plug 4 and the cavity, and extends the service life of the valve system. It also reduces impact noise caused by the sudden closure of the plug 4, improving the system's operational smoothness and quietness.

[0033] In one possible implementation, a baffle 8 is embedded in the inner wall of the third channel 3, and the spring seat 7 is supported on the baffle 8.

[0034] This structure provides a stable mounting reference for the spring seat 7 by setting a fixed baffle 8 on the inner wall of the third channel 3, ensuring the accurate axial arrangement of the spring 6 and the plug 4. The baffle 8 can be fixed to the inner wall of the channel by inserts, threads, or welding, providing rigid support to resist oil pressure and vibration interference.

[0035] The baffle 8 effectively prevents the spring seat 7 from shifting or rotating during use, improving the structural stability and operational consistency of the one-way valve mechanism. This design simplifies the cavity machining requirements and facilitates modular manufacturing and maintenance / replacement of components.

[0036] In one possible implementation, the plug 4 is spherical in shape.

[0037] Working principle: The spherical plug 4 structure allows the spherical surface to form an annular sealing contact with the inclined or conical sealing seat when the channel is closed, providing excellent self-centering and automatic sealing performance. When the oil pressure increases, the spherical plug 4, under the action of the spring 6, moves axially and opens the channel. When the pressure decreases, the spherical plug 4 automatically returns to its original position and restores the seal under the action of the spring 6.

[0038] The spherical plug 4 exhibits excellent hydrodynamic performance, reducing flow resistance and improving response sensitivity. Its spherical structure effectively accommodates sealing surface deviations caused by manufacturing errors or thermal expansion and contraction, enhancing system sealing reliability and adaptability. Furthermore, the spherical structure is simple to manufacture, making it suitable for mass production.

[0039] In the HST hydraulic system of this invention, a dedicated multi-functional connector is used to replace the traditional design where the HST housing's oil discharge port is directly connected to the radiator, fundamentally optimizing the oil flow path and system safety mechanism. The multi-functional connector has interconnected first channel 1 (port A), second channel 2 (port B), and third channel 3 (port C), which connect to the HST housing, radiator, and return oil tank, respectively. The third channel 3 contains a check valve structure, providing flow direction control capability.

[0040] Under normal system conditions, the hot oil discharged from the HST housing enters the connector through the first channel 1, flows to the radiator through the second channel 2 for cooling, and finally flows back to the oil tank, achieving thermal balance and normal circulation of the hydraulic oil.

[0041] When the return oil system becomes blocked (e.g., the return oil line is blocked by foreign objects), the oil pressure in the system rises rapidly. At this time, the one-way valve structure in the third channel 3 automatically opens after overcoming the preset spring force 6, allowing the hot oil to bypass the radiator and flow directly from port C to the oil tank, effectively avoiding failures such as damage to the HST seal or radiator bursting caused by pressure accumulation.

[0042] Furthermore, the overall structure of the connector features an adjustable design, allowing for flexible adjustment of the channel direction according to the overall layout, thus improving the convenience of pipeline installation. Integrating the one-way valve outlet with the long port further simplifies the structure and improves the system's reliability and anti-clogging capability. After thermal equilibrium is disrupted, operators can quickly locate the blockage and perform repairs or unblocking by detecting system anomalies, improving maintenance efficiency.

[0043] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A multi-functional joint specially configured for oil discharge of an HST housing, characterized in that, The cavity is internally provided with a first channel, a second channel and a third channel in communication with each other, the first channel is used for connecting with the HST shell, the second channel is connected with a radiator, and the third channel is connected with an oil return tank.

2. The multifunctional linker of claim 1, wherein, The third channel is internally provided with a one-way valve structure.

3. The multi-functional joint of claim 2, wherein The one-way valve structure comprises a spring and a plug, two ends of the spring are respectively in abutment with the plug and a spring seat, the spring seat is connected to an inner wall of the third channel, the inner wall of the third channel is a stepped structure, and the plug is movably arranged at an interface between the two layers of steps.

4. The multi-functional joint of claim 3, wherein The interface between the two layers of steps is a slope.

5. The multi-functional joint of claim 3, wherein A baffle is embedded in the inner wall of the third channel, and the spring seat is supported on the baffle.

6. The multi-functional joint of claim 3, wherein The plug is spherical.

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