Distribution valve for transmission of high-horsepower tractor
By designing a distribution valve for a high-horsepower tractor transmission, including a valve body, oil inlet, oil return, clutch oil port, working gear oil port, clutch control slide valve, and three-position three-way regulating slide valve, the problem of inaccurate oil delivery was solved, achieving precise control and rapid delivery of oil, reducing maintenance costs, and ensuring the normal, stable, and efficient operation of the tractor.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- HUZHOU SHENGLI HYDRAULIC
- Filing Date
- 2025-07-24
- Publication Date
- 2026-06-04
AI Technical Summary
High-horsepower tractors are complex to operate when shifting gears and adjusting speeds, and the inaccurate control of oil delivery leads to high oil consumption, slow response speed, and damage to components, affecting the normal, stable, and efficient operation of the tractor and increasing maintenance costs.
A distribution valve for a high-horsepower tractor transmission is adopted, which includes a valve body, an oil inlet, an oil return port, a clutch oil port, a working gear oil port, a clutch control slide valve, first and second relief valves, and a three-position three-way regulating slide valve. By controlling the connection of the slide valve's oil inlet, working oil port and oil return port, the precise delivery of oil and lubrication and cooling are achieved.
It achieves precise control and rapid delivery of hydraulic pressure, reduces maintenance costs, and ensures the normal, stable, and efficient operation of the tractor.
Smart Images
Figure CN2025110230_04062026_PF_FP_ABST
Abstract
Description
Distribution valve for high-horsepower tractor transmission Technical Field
[0001] This invention relates to a distribution valve, specifically a distribution valve for a high-horsepower tractor transmission. Background Technology
[0002] Currently, the agricultural sector is developing towards centralized mechanization, which has led to an increase in demand for large-scale agricultural machinery and equipment. Among them, high-horsepower tractors are a commonly used type. A high-horsepower tractor is disclosed in Chinese patent application with publication number CN216508660U, which includes a body, a cab, a drive unit, a transmission unit, a walking unit, a working unit, and a braking unit. The cab is located on top of the body, the walking unit is located below the body, and the working unit is located at the front and rear ends of the body. The drive unit, transmission unit, and braking unit are respectively located inside the body.
[0003] High-horsepower tractors use diesel engines as power outputs during operation, and transmit power through complex mechanical structures such as gearboxes. When changing speeds, the driver needs to operate a mechanical transducer and clutch to shift gears and adjust speeds, which is complex. The control of oil delivery during operation is extremely important. The clutch usually requires a certain amount of oil for lubrication during operation. Inadequate control of oil delivery pressure will lead to increased oil loss, slow response of various devices, and damage to components, affecting the normal operation of the tractor, increasing maintenance costs, and making it difficult for the tractor to work normally, stably, and efficiently. Summary of the Invention
[0004] The purpose of this invention is to provide a distribution valve for a high-horsepower tractor transmission, which overcomes the shortcomings of the prior art, not only ensuring response speed and reducing energy consumption, but also ensuring the normal, stable and efficient operation of the tractor.
[0005] The above-mentioned technical objective of this invention is mainly achieved through the following technical solution: a distribution valve for a high-horsepower tractor transmission, comprising a valve body, an oil inlet, an oil return, a clutch oil port, a working gear oil port, a clutch operating slide valve connected to the oil inlet, a clutch oil port and a brake oil port connected to the clutch operating slide valve, a first relief valve for controlling the pressure of the brake oil port, and a second relief valve for controlling the pressure of the working gear oil port, further comprising a three-position three-way adjusting slide valve disposed in the valve body and connected in parallel with the clutch operating slide valve, the three-position three-way adjusting slide valve having a... The valve comprises a working port connected to the clutch oil port and the working gear oil port, a spool valve return port connected to the return port, a spool valve inlet port connected to the inlet port, and a hydraulic control port connected to and parallel to the inlet port. When the three-position three-way regulating spool valve is in the initial position, the spool valve inlet port, the working port, and the spool valve return port are not connected. When the three-position three-way regulating spool valve is in the middle position, the spool valve inlet port and the working port are connected. When the three-position three-way regulating spool valve is in the end position, the spool valve inlet port, the working port, and the spool valve return port are all connected.
[0006] As a further preferred technical solution of the present invention, the three-position three-way regulating slide valve includes a slide valve mounting cavity disposed in the valve body, a slide valve core disposed in the slide valve mounting cavity, a threaded hole disposed at the end of the slide valve mounting cavity, a compression spring disposed in the threaded hole to apply elastic force to the slide valve core, a pressure adjusting sleeve screwed in the threaded hole, a set screw screwed on the pressure adjusting sleeve, and a set nut screwed on the set screw.
[0007] As a further preferred technical solution of the present invention, the slide valve core is provided with a first shrinkage portion, a second shrinkage portion, an annular groove, a shrinkage section located at the end of the slide valve core, a push rod valve core cavity provided at the end of the slide valve core, and a push rod valve core provided in the push rod valve core cavity.
[0008] As a further preferred embodiment of the present invention, the push rod valve core is provided with a plurality of pressure equalization grooves, and the pressure adjusting screw sleeve is provided with a spring seat for installing the compression spring.
[0009] As a further preferred technical solution of the present invention, the slide valve mounting cavity includes a first oil passage cavity communicating with the annular groove, the first oil passage cavity communicating with the slide valve inlet, and the annular groove communicating with the push rod valve core cavity through an oil passage located at the center of the slide valve core shaft.
[0010] As a further preferred embodiment of the present invention, the slide valve mounting cavity includes a second oil passage cavity communicating with the first retraction section, the second oil passage cavity communicating with the slide valve return port, the slide valve mounting cavity includes a third oil passage cavity communicating with the second retraction section, the third oil passage cavity communicating with the working oil port, and the slide valve mounting cavity includes a fourth oil passage cavity communicating with the retraction section, the fourth oil passage cavity communicating with the slide valve return port.
[0011] As a further preferred embodiment of the present invention, a sealing ring is provided at the position where the pressure adjusting screw sleeve contacts the inner edge of the threaded hole.
[0012] Therefore, the present invention features precise control of oil pressure and rapid oil delivery, instant delivery of oil lubrication and cooling protection device components, reduced maintenance costs, and ensures normal, stable and efficient operation of the tractor. Attached Figure Description
[0013] Figure 1 is an overall structural diagram of the present invention;
[0014] Figure 2 is a cross-sectional structural schematic diagram of the present invention;
[0015] Figure 3 is a schematic diagram of the spool valve core in Figure 2;
[0016] Figure 4 is a schematic diagram of the push rod valve core in Figure 2;
[0017] Figure 5 is a hydraulic principle diagram of the present invention. Detailed Implementation
[0018] The technical solution of the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings.
[0019] As shown in Figures 1-5, a distribution valve for a high-horsepower tractor transmission includes a valve body 1, an oil inlet P, an oil return T, a clutch oil port F, a working gear oil port D, a clutch operating spool valve 2 connected to the oil inlet P, a clutch oil port CA, a brake oil port CB, a first relief valve R3 for controlling the pressure of the brake oil port CB, and a second relief valve R2 for controlling the pressure of the working gear oil port D. It also includes a clutch control valve located within the valve body 1. The three-position three-way regulating spool valve R1 is connected in parallel with the control spool valve 2. The three-position three-way regulating spool valve R1 has a working oil port A1 connected to the clutch oil port F and the working gear oil port D, a spool valve return oil port T1 connected to the return oil port T, a spool valve inlet oil port P1 connected to the inlet oil port P, and a hydraulic control port K1 connected to the inlet oil port P and in parallel with the spool valve inlet oil port P1. When the three-position three-way regulating spool valve R1 is in the initial position, the spool valve inlet oil port P1, the working oil port A1, and the spool valve return oil port T1 are not connected. When the three-position three-way regulating spool valve R1 is in the middle position, the spool valve inlet P1 and the working port A1 are connected. When the three-position three-way regulating spool valve R1 is in the end position, the spool valve inlet P1, the working port A1, and the spool valve return port T1 are all connected. The aforementioned clutch operating spool valve, the first relief valve, and the second relief valve are all products currently available on the market and are existing technologies, so they will not be described in detail here. The working port of the aforementioned three-position three-way regulating spool valve is connected to the clutch port and the working gear port to deliver lubricating oil, so as to achieve stable, timely, and precise lubrication and cooling. The spool valve inlet of the three-position three-way regulating spool valve is connected to the inlet port, so that the lubricating oil enters the three-position three-way regulating spool valve for oil distribution and regulation through the three-position three-way regulating spool valve, so as to change the connection structure of the oil circuit and achieve precise delivery of oil with different functions. The spool valve return port of the three-position three-way regulating spool valve is connected to the return port, so as to stabilize the oil pressure in the internal oil circuit of the three-position three-way regulating spool valve.
[0020] When the three-position three-way regulating valve is in its initial position, i.e., when the three-position three-way regulating valve is not working, the valve inlet, working port, and return port are all disconnected. When the three-position three-way regulating valve R1 is in the middle position, the valve return port is disconnected from the valve inlet and working port, while the valve inlet and working port are connected. When the three-position three-way regulating valve is in the end position, the valve inlet, working port, and return port are connected, achieving stable oil delivery and stable oil pressure maintenance. The valve inlet, working port, and return port are all controlled by the three-position three-way regulating valve to open and close, regulate oil pressure, and distribute oil. This not only ensures precise oil pressure and rapid oil delivery and control, but also guarantees the normal, stable, and efficient operation of the tractor.
[0021] As shown in Figure 2-4, the three-position three-way regulating slide valve R1 includes a slide valve mounting cavity R101 located within the valve body 1, a slide valve core R102 located within the slide valve mounting cavity R101, a threaded hole R103 located at the end of the slide valve mounting cavity R101, a compression spring R104 located within the threaded hole R103 to apply elastic force to the slide valve core R102, an adjusting screw sleeve R105 screwed into the threaded hole R103, a set screw R106 screwed onto the adjusting screw sleeve R105, and a set nut R107 screwed onto the set screw R106. The adjusting screw sleeve R105 contains a spring seat R1028 for mounting the compression spring R104, and a sealing ring R1051 is provided at the contact point between the adjusting screw sleeve R105 and the inner edge of the threaded hole R103. The spool valve core R102 is provided with a first contraction section R1021, a second contraction section R1022, an annular groove R1023, a retracted section R1024 located at the end of the spool valve core R102, a push rod valve core cavity R1025 located at the end of the spool valve core R102, and a push rod valve core R1026 located in the push rod valve core cavity R1025. The push rod valve core R1026 is provided with a plurality of pressure equalizing grooves R1027. The spool valve mounting cavity R101 includes a first oil passage cavity R1011 communicating with the annular groove R1023. The first oil passage cavity R1011 is communicating with the spool valve inlet P1. The annular groove R1023 is connected to the push rod valve core cavity R1025 through an oil passage R1029 located at the axis of the spool valve core R102. The spool valve mounting cavity R101 includes a first oil passage R1021, a second contraction section R1022, an annular groove R1023, a retracted section R1024 located at the end of the spool valve core R102, a push rod valve core cavity R1025, and a push rod valve core R1026 located in the push rod valve core cavity R1025. The first retractable section R1021 connects to the second oil passage R1012, which is connected to the spool valve return port T1. The spool valve mounting cavity R101 includes a third oil passage R1013 connected to the second retractable section R1022, which is connected to the working oil port A1. The spool valve mounting cavity R101 also includes a fourth oil passage R1014 connected to the retracted section R1024, which is connected to the spool valve return port T1. The spool valve core can slide axially within the spool valve mounting cavity to control the opening and closing of the spool valve inlet, working oil port, and spool valve return port, as well as the oil adjustment and distribution. One end of the spool valve core abuts against the end of the spool valve mounting cavity via a push rod valve core in the push rod valve core cavity, and the movement of the push rod drives the spool valve. As the valve core moves, oil enters the first oil passage chamber from the spool valve inlet, and then flows through the annular groove into the oil passage. It then enters the push rod valve core chamber, applying pressure to the push rod valve core or releasing the pressure, causing the push rod valve core to extend out of or retract into the chamber, thus moving the spool valve core. Simultaneously, oil between the second oil passage chamber and the first retraction section, and oil between the fourth oil passage chamber and the retraction section, flow at the spool valve return port as the spool valve core moves, adapting to different oil pressure changes and maintaining stable oil pressure. Furthermore, oil between the third oil passage chamber and the second retraction section flows at the working oil port as the spool valve core moves, adapting to different oil pressure changes and maintaining stable oil pressure while continuing its function of oil pressure regulation and oil distribution.
[0022] A compression spring is installed at the other end of the spool valve core. One end of the compression spring contacts the spool valve core, and the other end contacts the spring seat inside the pressure regulating screw sleeve. This allows the compression spring to always apply elastic force to the spool valve core to maintain the stable regulation and distribution of oil by the spool valve core. The set screw and set nut seal the opening at the end of the pressure regulating screw sleeve, and the sealing ring can enhance the airtightness between the pressure regulating screw sleeve and the threaded hole to prevent oil leakage.
[0023] The first contraction section of the aforementioned spool valve core has a conical surface and an arc-shaped conical surface at both ends, and the second contraction section also has conical surfaces and arc-shaped conical surfaces arranged in the same direction at both ends. The first and second contraction sections are both formed into annular groove structures in the second and third oil passages, which makes the flow of oil more stable and smooth when the spool valve core moves, and makes the regulation of oil pressure and the distribution of oil more stable and reliable.
[0024] The above embodiments are preferred implementations of the present invention. In addition, the present invention can be implemented in other ways. Any obvious substitutions without departing from the concept of the present technical solution are within the protection scope of the present invention.
Claims
1. A distribution valve for a high-horsepower tractor transmission, comprising a valve body (1), an oil inlet (P), an oil return (T), a clutch oil port (F), a working gear oil port (D) disposed on the valve body (1), a clutch operating slide valve (2) connected to the oil inlet (P), a clutch operating slide valve (2) connected to a clutch oil port (CA) and a brake oil port (CB), a first relief valve (R3) for controlling the pressure of the brake oil port (CB), and a second relief valve (R2) for controlling the pressure of the working gear oil port (D), characterized in that: It also includes a three-position three-way regulating slide valve (R1) disposed in the valve body (1) and connected in parallel with the clutch operating slide valve (2). The three-position three-way regulating slide valve (R1) is provided with a working oil port (A1) connected to the clutch oil port (F) and the working gear oil port (D), a slide valve return oil port (T1) connected to the return oil port (T), a slide valve inlet port (P1) connected to the inlet port (P), and a hydraulic control port (K1) connected to the inlet port (P) and connected in parallel with the slide valve inlet port (P1). When the three-position three-way regulating slide valve (R1) is in the initial position, the slide valve inlet (P1), the working port (A1), and the slide valve return port (T1) are not connected. When the three-position three-way regulating slide valve (R1) is in the middle position, the slide valve inlet (P1) and the working port (A1) are connected. When the three-position three-way regulating slide valve (R1) is in the end position, the slide valve inlet (P1), the working port (A1), and the slide valve return port (T1) are all connected.
2. The distribution valve for a high-horsepower tractor transmission according to claim 1, characterized in that: The three-position three-way regulating slide valve (R1) includes a slide valve mounting cavity (R101) in the valve body (1), a slide valve core (R102) in the slide valve mounting cavity (R101), a threaded hole (R103) at the end of the slide valve mounting cavity (R101), a compression spring (R104) in the threaded hole (R103) that applies elastic force to the slide valve core (R102), a pressure adjusting sleeve (R105) screwed into the threaded hole (R103), a set screw (R106) screwed onto the pressure adjusting sleeve (R105), and a set nut (R107) screwed onto the set screw (R106).
3. The distribution valve for a high-horsepower tractor transmission according to claim 2, characterized in that: The slide valve (R102) is provided with a first contraction section (R1021), a second contraction section (R1022), an annular groove (R1023), a retracted section (R1024) located at the end of the slide valve (R102), a push rod valve core cavity (R1025) provided at the end of the slide valve core (R102), and a push rod valve core (R1026) provided in the push rod valve core cavity (R1025).
4. The distribution valve for a high-horsepower tractor transmission according to claim 3, characterized in that: The push rod valve core (R1026) is provided with multiple pressure equalization grooves (R1027), and the pressure adjusting screw sleeve (R105) is provided with a spring seat (R1028) for installing the compression spring (R104).
5. The distribution valve for a high-horsepower tractor transmission according to claim 3, characterized in that: The slide valve mounting cavity (R101) includes a first oil passage cavity (R1011) communicating with the annular groove (R1023). The first oil passage cavity (R1011) is communicating with the slide valve inlet (P1). The annular groove (R1023) is communicating with the push rod valve core cavity (R1025) through an oil passage (R1029) located at the axis of the slide valve (R102).
6. The distribution valve for a high-horsepower tractor transmission according to claim 3, characterized in that: The slide valve mounting cavity (R101) includes a second oil passage (R1012) communicating with the first retraction section (R1021), the second oil passage (R1012) communicating with the slide valve return port (T1), the slide valve mounting cavity (R101) includes a third oil passage (R1013) communicating with the second retraction section (R1022), the third oil passage (R1013) communicating with the working oil port (A1), the slide valve mounting cavity (R101) includes a fourth oil passage (R1014) communicating with the retraction section (R1024), the fourth oil passage (R1014) communicating with the slide valve return port (T1).
7. The distribution valve for a high-horsepower tractor transmission according to claim 2, characterized in that: A sealing ring (R1051) is provided at the position where the pressure adjusting screw sleeve (R105) contacts the inner edge of the threaded hole (R103).