Distribution valve for transmission of high-horsepower tractor

Abstract

The invention discloses a distribution valve for a transmission of a high-horsepower tractor. Comprising a valve body, an oil inlet, an oil return port, a clutch oil port, a working gear oil port, a clutch control slide valve, a clutch oil port and a brake oil port, wherein the oil inlet, the oil return port, the clutch oil port and the working gear oil port are formed in the valve body; the first overflow valve is used for controlling the pressure of the brake oil port, the second overflow valve is used for controlling the pressure of the working gear oil port, and the three-position three-way adjusting slide valve is further included. And the three-position three-way adjusting slide valve is provided with a working oil port, a slide valve oil return port, a slide valve oil inlet and a hydraulic control port which is communicated with the oil inlet and is connected with the slide valve oil inlet in parallel. The device has the characteristics that the oil pressure is accurately controlled, the oil is quickly conveyed, the oil is instantly conveyed to lubricate, cool and protect the device parts, the maintenance cost is reduced, and the normal, stable and efficient work of the tractor is ensured.

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 the more commonly used ones. 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, the transmission device and the braking device are respectively arranged inside the body.

[0003] When a high-horsepower tractor is moving, it uses a diesel engine as 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, which will affect the normal operation of the tractor, increase maintenance costs, and make it difficult for the tractor to work 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 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, 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 The clutch oil port, the working oil port connected to the working gear oil port, the slide valve oil return port connected to the oil return port, the slide valve oil inlet connected to the oil inlet, and the hydraulic control port connected to the oil inlet and connected 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 oil 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 oil 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 installation cavity arranged in the valve body, a slide valve core arranged in the slide valve installation cavity, a threaded hole arranged at the end of the slide valve installation cavity, a compression spring arranged in the threaded hole for applying elastic force to the slide valve core, 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-passing cavity connected to the annular groove, the first oil-passing 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-passing channel arranged at the axis center of the sliding valve core.

[0010] As a further preferred technical solution of the present invention, the sliding valve installation cavity includes a second oil-through cavity connected to the first contraction portion, the second oil-through cavity is connected to the oil return port of the sliding valve, the sliding valve installation cavity includes a third oil-through cavity connected to the second contraction portion, the third oil-through cavity is connected to the working oil port, the sliding valve installation cavity includes a fourth oil-through cavity connected to the retracted section, and the fourth oil-through cavity 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 cross-sectional structural schematic diagram of the present invention;

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

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

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

[0018] The technical solution of the present invention is 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, 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 also includes a valve body 1 and a clutch operating valve 2 connected to the clutch operating valve 2. 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 with the clutch oil port F and the working gear oil port D, a slide valve return oil port T1 connected with the return oil port T, a slide valve oil inlet P1 connected with the oil inlet P, and a hydraulic control port K1 connected 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 is not connected with the working oil port A1 and the slide valve return oil port T1. When the three-position three-way regulating slide valve R1 is in the middle position, the slide valve oil inlet P1 is connected to the working oil port A1; when the three-position three-way regulating slide valve R1 is in the end position, the slide valve oil inlet P1 is connected to the working oil port A1 and the slide valve oil return port T1; the above-mentioned clutch operating slide valve, the first relief valve and the second relief valve are all products currently available on the market and are prior art, and are not described in detail here. The working oil port of the above-mentioned three-position three-way regulating slide 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 slide valve oil inlet of the three-position three-way regulating slide valve is connected to the oil inlet, so that the lubricating oil enters the three-position three-way regulating slide valve for oil distribution and regulation through the three-position three-way regulating slide valve to change the connecting structure of the oil circuit to achieve accurate transportation of oil with different functions. The slide valve oil return port of the three-position three-way regulating slide valve is connected to the oil return port to facilitate the stability of the oil pressure in the oil circuit inside the three-position three-way regulating slide 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, which not only accurately and quickly delivers and controls the oil pressure, but also ensures the normal, stable and efficient operation of the tractor.

[0021] like Figure 2-4As shown, the three-position three-way regulating slide valve R1 includes a slide valve installation cavity R101 arranged in the valve body 1, a slide valve core R102 arranged in the slide valve installation cavity R101, a threaded hole R103 arranged at the end of the slide valve installation cavity R101, a compression spring R104 arranged 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, a spring seat R1028 for installing the compression spring R104 is arranged in the pressure regulating screw sleeve R105, a sealing ring R1051 is arranged 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 provided at the end of the sliding valve core R102, and a push rod valve core R1026 provided in the push rod valve core cavity R1025, a plurality of pressure equalizing grooves R1027 are provided on the push rod valve core R1026, the sliding valve installation cavity R101 includes a first oil-passing cavity R1011 connected with the annular groove R1023, the first oil-passing cavity R1011 is connected with the sliding valve oil inlet P1, the annular groove R1023 is connected with the push rod valve core cavity R1025 through an oil passage R1029 provided at the axis of the sliding valve core R102, the sliding valve installation cavity R101 includes 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, and a push rod valve core R1026 provided in the push rod valve core cavity R1025. 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, 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 adjustment 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 abutted against 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 cam is in motion, the oil enters the first oil chamber from the oil inlet of the sliding valve, and enters the oil passage along the annular groove from 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 sliding valve core. At the same time, the oil between the second oil chamber and the first contraction section, and the oil between the fourth oil chamber and the retraction section flow at the oil return port of the sliding valve as the sliding valve core moves to adapt to the changes in different oil pressures and maintain the stability of the oil pressure. At the same time, the oil between the third oil chamber and the second contraction section flows at the working oil port as the sliding valve core moves to adapt to the changes in different oil pressures and maintain the stability of the oil pressure while maintaining the effect on oil pressure regulation and oil distribution.

[0022] A compression spring is arranged 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 distributing effect of the sliding valve core on the oil. The set screw and the set 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 conical surfaces and arc-shaped conical surfaces arranged in the same direction. The first contraction portion and the second contraction portion are both formed as 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 may also be implemented in other ways. Any obvious replacement without departing from the concept of the present technical solution is 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 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 invention also comprises a three-position three-way regulating slide valve (R1) arranged 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 with the clutch oil port (F) and the working gear oil port (D), a slide valve oil return port (T1) connected with the oil return port (T), a slide valve oil inlet port (P1) connected with the oil inlet port (P), and a hydraulic control port (K1) connected with the oil inlet port (P) and connected in parallel with the slide valve oil inlet port (P1). ), when the three-position three-way regulating slide valve (R1) is in the initial position, the slide valve oil inlet (P1) is not connected to the working oil port (A1) and the slide valve oil return port (T1); when the three-position three-way regulating slide valve (R1) is in the middle position, the slide valve oil inlet (P1) is connected to the working oil port (A1); when the three-position three-way regulating slide valve (R1) is in the end position, the slide valve oil inlet (P1) is connected to the working oil port (A1) and the slide valve oil return port (T1).

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) arranged in the valve body (1), a slide valve core (R102) arranged in the slide valve installation cavity (R101), a threaded hole (R103) arranged at the end of the slide valve installation cavity (R101), a compression spring (R104) arranged 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) provided at the end of the sliding 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 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 sliding valve installation cavity (R101) comprises a first oil passage cavity (R1011) connected to the annular groove (R1023); the first oil passage cavity (R1011) is connected to the sliding valve oil inlet (P1); the annular groove (R1023) is connected to the push rod valve core cavity (R1025) via an oil passage (R1029) provided at the axis of the sliding 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).

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