Distribution valve for high-horsepower tractor transmission

Abstract

The present invention discloses a distribution valve for a high-horsepower tractor transmission, comprising a valve body, an oil inlet, an oil return port, 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. The valve also includes a three-position, three-way regulating slide valve, the three-position, three-way regulating slide valve having a working oil port, a slide valve oil return port, a slide valve oil inlet, and a hydraulic control port connected to the oil inlet and in parallel with the slide valve oil inlet. The present invention features precise control of oil pressure, rapid oil delivery, and immediate oil delivery for lubricating components of a cooling and protection device, reducing maintenance costs and ensuring normal, stable, and efficient operation of the tractor.

Description

Technical Field

[0001] The invention belongs to a distribution valve, in particular to a distribution valve for a high-horsepower tractor transmission. Background Art

[0002] At present, the agricultural field is developing towards centralized mechanization, and the demand for large-scale agricultural machinery and equipment has increased accordingly. Among them, high-horsepower tractors are a relatively commonly used type. In the Chinese patent application with publication number CN216508660U, a high-horsepower tractor is disclosed, including a body, a cab, a drive device, a transmission device, a traveling device, an operating device and a braking device. The cab is arranged above the body, the traveling device is arranged below the body, the operating device is arranged at the front and rear ends of the body, and the drive device, transmission device and braking device are respectively arranged inside the body.

[0003] When a high-horsepower tractor is moving, it uses a diesel engine as its power output, and then transmits power through complex mechanical structures such as gear transmissions. Moreover, when changing speeds, the driver needs to operate the mechanical variable and clutch to shift gears and adjust the speed. The operation is complicated, and the oil delivery control during operation is extremely important. The clutch usually requires partial oil delivery for lubrication during operation. Inadequate control of the oil delivery pressure will lead to increased oil loss, slow response speed 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 operate normally, stably and efficiently. Summary of the Invention

[0004] The object of the present invention is to provide a distribution valve for a high-horsepower tractor transmission, which overcomes the shortcomings of the prior art and can not only ensure the response speed and reduce energy consumption, but also ensure the normal, stable and efficient operation of the tractor.

[0005] The above technical objectives of the present invention are mainly solved by the following technical solutions: a distribution valve for a high-horsepower tractor transmission, comprising a valve body, an oil inlet, an oil return port, a clutch oil port, a working gear oil port, a clutch operating slide valve connected to the oil inlet, a clutch oil port, 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, and also comprising a three-position three-way regulating slide valve arranged in the valve body and connected in parallel with the clutch operating slide valve, the three-position three-way regulating slide valve having a plurality of holes and a plurality of holes. The clutch oil port, the working oil port connected to the working gear oil port, the slide valve return port connected to the return oil port, the slide valve oil inlet connected to the oil inlet, and the hydraulic control port connected to the oil inlet and in parallel with the slide valve oil inlet. When the three-position three-way regulating slide valve is in the initial position, the slide valve oil inlet and the working oil port and the slide valve return port are not connected. When the three-position three-way regulating slide valve is in the middle position, the slide valve oil inlet and the working oil port are connected. When the three-position three-way regulating slide valve is in the end position, the slide valve oil inlet and the working oil port and the slide 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 chamber provided in the valve body, a slide valve spool provided in the slide valve mounting chamber, a threaded hole provided at the end of the slide valve mounting chamber, a compression spring provided in the threaded hole for applying elastic force to the slide valve spool, a pressure-regulating screw sleeve threaded in the threaded hole, a set screw threaded on the pressure-regulating screw sleeve, and a set nut threaded on the set screw.

[0007] As a further preferred technical solution of the present invention, the sliding valve core is provided with a first contraction portion, a second contraction portion, an annular groove, a retracted section located at the end of the sliding valve core, a push rod valve core cavity provided at the end of the sliding valve core, and a push rod valve core provided in the push rod valve core cavity.

[0008] As a further preferred technical solution of the present invention, a plurality of pressure-equalizing grooves are provided on the push rod valve core, and a spring seat for installing the compression spring is provided in the pressure-regulating screw sleeve.

[0009] As a further preferred technical solution of the present invention, the sliding valve installation cavity includes a first oil cavity connected to the annular groove, the first oil cavity is connected to the oil inlet of the sliding valve, and the annular groove is connected to the push rod valve core cavity through an oil passage provided at the axis center of the sliding valve core.

[0010] As a further preferred technical solution of the present invention, the sliding valve installation chamber includes a second oil chamber connected to the first contraction portion, the second oil chamber is connected to the oil return port of the sliding valve, the sliding valve installation chamber includes a third oil chamber connected to the second contraction portion, the third oil chamber is connected to the working oil port, the sliding valve installation chamber includes a fourth oil chamber connected to the retracted section, and the fourth oil chamber is connected to the oil return port of the sliding valve.

[0011] As a further preferred technical solution of the present invention, a sealing ring is provided at the position where the pressure regulating screw sleeve contacts the inner edge of the threaded hole.

[0012] Therefore, the present invention has the characteristics of precise control of oil pressure and rapid oil delivery, instant oil delivery to lubricate cooling and protection device components, reduced maintenance costs, and ensuring normal, stable, and efficient operation of the tractor. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is the overall structural diagram of the present invention;

[0014] Figure 2 It is a schematic cross-sectional view of the present invention;

[0015] Figure 3 yes Figure 2 Schematic diagram of the structure of the spool of the sliding valve;

[0016] Figure 4 yes Figure 2 Schematic diagram of the structure of the push rod valve core;

[0017] Figure 5 It is a hydraulic principle diagram of the present invention. DETAILED DESCRIPTION

[0018] The technical solution of the present invention will be further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0019] like Figure 1-5As shown, a distribution valve for a high-horsepower tractor transmission includes a valve body 1, an oil inlet P, an oil return port T, a clutch oil port F, a working gear oil port D, a clutch operating slide valve 2 connected to the oil inlet P, a clutch oil port CA and a brake oil port CB connected to the clutch operating slide valve 2, 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, and further includes a valve body 1 and a clutch operating valve. The three-position three-way regulating slide valve R1 is connected in parallel with the 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 P1 connected to the oil inlet P, and a hydraulic control port K1 connected to the oil inlet P and connected in parallel with the slide valve inlet P1. When the three-position three-way regulating slide valve R1 is in the initial position, the slide valve inlet P1 is disconnected from the working oil port A1 and the slide valve return oil port T1. When the three-position three-way regulating spool valve R1 is in the middle position, the spool valve oil inlet P1 is connected to the working oil port A1. When the three-position three-way regulating spool valve R1 is in the end position, the spool valve oil inlet P1 is connected to the working oil port A1 and the spool valve oil return port T1. The above-mentioned clutch operating spool valve, first relief valve and second relief valve are all products currently available on the market and are prior art, and will not be described in detail here. The working oil port of the above-mentioned three-position three-way regulating spool valve is connected to the clutch oil port and the working gear oil port to transport lubricating oil to achieve stable, timely and accurate lubrication and cooling effects. The spool valve oil inlet of the three-position three-way regulating spool valve is connected to the oil inlet, 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, thereby changing the connection structure of the oil circuit to achieve accurate transportation of oil for different functions. The spool valve oil return port of the three-position three-way regulating spool valve is connected to the oil return port to stabilize the oil pressure in the oil circuit inside the three-position three-way regulating spool valve.

[0020] When the three-position three-way regulating slide valve is in the initial position, that is, the three-position three-way regulating slide valve is not working, the slide valve oil inlet, the working oil port and the slide valve oil return port are all disconnected. When the three-position three-way regulating slide valve R1 is in the middle position, the slide valve oil return port is disconnected from the slide valve oil inlet and the working oil port, and the slide valve oil inlet and the working oil port are connected. When the three-position three-way regulating slide valve is in the end position, the slide valve oil inlet, the working oil port and the slide valve oil return port are connected to achieve stable oil delivery and stable maintenance of oil pressure. The slide valve oil inlet, the working oil port and the slide valve oil return port are all controlled by the three-position three-way regulating slide valve to control on-off, oil pressure regulation and oil distribution. Not only is the oil pressure accurate and the oil is quickly delivered and controlled, but the normal, stable and efficient operation of the tractor can be guaranteed.

[0021] like Figure 2-4As shown, the three-position three-way regulating slide valve R1 includes a slide valve installation chamber R101 provided in the valve body 1, a slide valve spool R102 provided in the slide valve installation chamber R101, a threaded hole R103 provided at the end of the slide valve installation chamber R101, a compression spring R104 provided in the threaded hole R103 to apply elastic force to the slide valve spool R102, a pressure regulating screw sleeve R105 screwed in the threaded hole R103, a set screw R106 screwed on the pressure regulating screw sleeve R105, and a set nut R107 screwed on the set screw R106, a spring seat R1028 for installing the compression spring R104 is provided in the pressure regulating screw sleeve R105, a sealing ring R1051 is provided at the position where the pressure regulating screw sleeve R105 contacts the inner edge of the threaded hole R103, and the slide valve The core R102 is provided with a first contraction portion R1021, a second contraction portion R1022, an annular groove R1023, a contraction section R1024 located at the end of the sliding valve core R102, a push rod valve core cavity R1025 located at the end of the sliding 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 sliding valve installation cavity R101 includes a first oil-passing cavity R1011 communicating with the annular groove R1023. The first oil-passing cavity R1011 is communicated with the sliding valve oil inlet P1. The annular groove R1023 is communicated with the push rod valve core cavity R1025 through an oil passage R1029 located at the axis of the sliding valve core R102. The sliding valve installation cavity R101 includes a first oil-passing cavity R1011 communicating with the annular groove R1023. The first oil-passing cavity R1011 is communicated with the sliding valve oil inlet P1. The annular groove R1023 is communicated with the push rod valve core cavity R1025 through an oil passage R1029 located at the axis of the sliding valve core R102. The second oil chamber R1012 is connected to the second contraction section R1021, and the second oil chamber R1012 is connected to the slide valve oil return port T1. The slide valve installation chamber R101 includes a third oil chamber R1013 connected to the second contraction section R1022, and the third oil chamber R1013 is connected to the working oil port A1. The slide valve installation chamber R101 includes a fourth oil chamber R1014 connected to the retracted section R1024, and the fourth oil chamber R1014 is connected to the slide valve oil return port T1. The above-mentioned slide valve core can slide axially in the slide valve installation chamber to control the on-off and oil regulation and distribution of the slide valve oil inlet, the working oil port and the slide valve return port. One end of the slide valve core is in contact with the end of the slide valve installation chamber through the push rod valve core in the push rod valve core chamber, and the movement of the push rod drives the slide valve core to move When the spool is in operation, the oil flows into the first oil chamber from the oil inlet of the sliding valve, and enters the oil passage along the annular groove of the first oil chamber, and then enters the push rod valve core chamber to give pressure to the push rod valve core or cancel the pressure on the push rod valve core, so that the push rod valve core extends out of the push rod valve core chamber or retracts into the push rod valve core chamber, thereby realizing the movement of the spool. At the same time, the oil between the second oil chamber and the first contraction part, and the oil between the fourth oil chamber and the contraction section flow at the oil return port of the sliding valve as the spool moves to adapt to the changes in different oil pressures and maintain the stability of the oil pressure. The oil between the third oil chamber and the second contraction part flows at the working oil port as the spool moves to adapt to the changes in different oil pressures and maintain the stability of the oil pressure while maintaining the effect of oil pressure regulation and oil distribution.

[0022] A compression spring is set at the other end of the sliding valve core, one end of the compression spring contacts the sliding valve core, and the other end of the compression spring contacts the spring seat in the pressure-regulating screw sleeve, so that the compression spring can always exert elastic force on the sliding valve core to maintain the stable regulating and distribution effect of the sliding valve core on the oil. The tightening screw and the tightening nut seal the opening at the end of the pressure-regulating screw sleeve, and the setting of the sealing ring can enhance the air tightness between the pressure-regulating screw sleeve and the threaded hole to avoid oil leakage.

[0023] The two ends of the first contraction portion of the above-mentioned sliding valve core are respectively a conical surface and an arc-shaped conical surface, and the two ends of the second contraction portion are also a conical surface and an arc-shaped conical surface arranged in the same direction. The first contraction portion and the second contraction portion are both formed into annular groove structures in the second oil chamber and the third oil chamber, so that when the sliding valve core moves, the flow of oil is more stable and smooth, and the regulation of oil pressure and the distribution of oil are more stable and reliable.

[0024] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present technical solution is within the scope of protection 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 port (T), a clutch oil port (F), a working gear oil port (D), a clutch operating slide valve (2) connected to the oil inlet (P), a clutch oil port (CA), a brake oil port (CB) connected to the clutch operating slide valve (2), 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: The valve body (1) further comprises a three-position, three-way regulating slide valve (R1) arranged in parallel with the clutch operating slide valve (2), wherein the three-position, three-way regulating slide valve (R1) is provided with a working oil port (A1) communicating with the clutch oil port (F) and the working gear oil port (D), a slide valve return oil port (T1) communicating with the oil return port (T), a slide valve oil inlet (P1) communicating with the oil inlet (P), and a hydraulic control port (K1) communicating with the oil inlet (P) and connected in parallel with the slide valve oil inlet (P1). ), when the three-position three-way regulating slide valve (R1) is in the initial position, the slide valve oil inlet (P1) and the working oil port (A1) and the slide valve oil return port (T1) are not connected; when the three-position three-way regulating slide valve (R1) is in the middle position, the slide valve oil inlet (P1) and the working oil port (A1) are connected; when the three-position three-way regulating slide valve (R1) is in the end position, the slide valve oil inlet (P1) and the working oil port (A1) and the slide valve oil 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) comprises a slide valve installation cavity (R101) provided in the valve body (1), a slide valve core (R102) provided in the slide valve installation cavity (R101), a threaded hole (R103) provided at the end of the slide valve installation cavity (R101), a compression spring (R104) provided in the threaded hole (R103) for applying elastic force to the slide valve core (R102), a pressure regulating screw sleeve (R105) screwed in the threaded hole (R103), a set screw (R106) screwed on the pressure regulating screw sleeve (R105), and a set nut (R107) screwed on the set screw (R106).

3. The distribution valve for a high-horsepower tractor transmission according to claim 2, characterized in that: The sliding valve core (R102) is provided with a first contraction portion (R1021), a second contraction portion (R1022), an annular groove (R1023), a retracted section (R1024) located at the end of the sliding valve core (R102), a push rod valve core cavity (R1025) located at the end of the sliding valve core (R102), and a push rod valve core (R1026) located 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 a plurality of pressure equalizing grooves (R1027), and the pressure regulating 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 installation cavity (R101) includes a first oil passage cavity (R1011) connected to the annular groove (R1023), the first oil passage cavity (R1011) is connected to the slide valve oil inlet (P1), and the annular groove (R1023) is connected to the push rod valve core cavity (R1025) through an oil passage (R1029) provided at the axis of the slide valve core (R102).

6. The distribution valve for a high-horsepower tractor transmission according to claim 3, characterized in that: The slide valve installation chamber (R101) includes a second oil chamber (R1012) connected to the first contraction portion (R1021), the second oil chamber (R1012) is connected to the slide valve oil return port (T1), the slide valve installation chamber (R101) includes a third oil chamber (R1013) connected to the second contraction portion (R1022), the third oil chamber (R1013) is connected to the working oil port (A1), and the slide valve installation chamber (R101) includes a fourth oil chamber (R1014) connected to the retracted section (R1024), the fourth oil chamber (R1014) is connected to the slide valve oil 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 a position where the pressure regulating screw sleeve (R105) contacts the inner edge of the threaded hole (R103).

Images