Tractor gear pump rear cover integrated with constant-flow overflow function

Abstract

The utility model discloses a tractor gear pump rear cover integrated with a constant-flow overflow function, which comprises a rear pump cover shell arranged on a tractor gear pump, a constant-flow valve core body is arranged on the rear pump cover shell, a constant-flow valve core bottom surface channel is arranged at the bottom of the constant-flow valve core body, and a constant-flow valve core bottom surface channel is arranged at the bottom of the constant-flow valve core body. A bottom face channel of the constant-flow valve element is communicated with a pressure feedback channel, and the pressure feedback channel feeds back the pressure difference to the constant-flow valve set. According to the tractor gear pump rear cover integrated with the constant-flow overflow function, pressure oil flows into the P-port oil cavity from the P-port body, then flows to the A-port body through the throttling channel and flows out through the A-port body, overall operation is stable, and the problem that the overall efficiency is reduced due to the fact that resistance is increased by arranging a lining plate is solved; the pressure difference of the throttling channel is fed back to the constant-flow valve set through the constant-flow valve element bottom face channel and the pressure feedback channel, closed-loop control is formed, stable operation of the system is ensured, and the problem that the whole operation is uneven due to the fact that the conveying flow is affected is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of tractor parts, in particular to a tractor gear pump rear cover with an integrated constant flow overflow function. Background Art

[0002] A gear pump is installed on the tractor to convert the mechanical energy output by the engine into hydraulic energy to operate the hydraulic components of the tractor and the supporting agricultural machinery working parts. However, the existing tractor gear pump still has certain defects when used;

[0003] During use, conventional gear pumps mainly adopt a floating sleeve structure. Although this structure can provide higher volumetric efficiency for tractors, its floating characteristics will cause the gear pump to wear faster, increase temperature, shorten the service life of the gear pump, and thus affect the working efficiency of the tractor.

[0004] To overcome the above-mentioned drawbacks, prior art 1 (Chinese patent application number 201520998391.0, filed December 7, 2015) discloses a gear pump with a composite liner structure, comprising: a driving gear, a retaining ring, an oil seal, a front cover, a bearing, a first sealing ring, a liner, a driven gear, a pump body, a locating pin, a second sealing ring, a rear cover, and bolts. The bearing is mounted in the front and rear covers, and the pump body is connected to the front and rear covers via locating pins and bolts. The driving gear and driven gear pump, each equipped with a retaining ring and an oil seal, are mounted in the front and rear covers via the pump body, and the first sealing ring, liner, and second sealing ring are mounted on the pump body. By installing this new gear pump on a tractor, the liner structure disposed between the front and rear covers and the driving and driven gears stabilizes the gaps between the driving and driven gears and the liner, thereby reducing the amount of scavenging in the gear pump, achieving a stable hydraulic output, reducing wear and heat generation in the gear pump, extending the service life of the gear pump, and improving the reliability of the hydraulic system.

[0005] Although the existing technology can improve the service life of the gear pump, during operation, a liner is set to be stuck inside the driving gear and the driven gear to maintain stability. The presence of the liner may increase the resistance to fluid flow, thereby affecting the performance of the pump and causing a decrease in efficiency. In addition, the liner is stuck inside the gear, which not only increases the overall maintenance complexity and cost, but also easily affects the output flow rate, making the overall system run unevenly, thereby affecting the normal operation and accuracy of the equipment.

[0006] In view of the above problems, it is urgent to carry out innovative design based on the original tractor gear pump back cover with integrated constant flow overflow function. Therefore, we propose a tractor gear pump back cover with integrated constant flow overflow function, which can well solve the above problems. Utility Model Content

[0007] The purpose of the utility model is to provide a tractor gear pump rear cover with an integrated constant flow overflow function, so as to solve the problem raised in the above-mentioned background technology that a liner is set in the current market to be stuck inside the driving gear and the driven gear to maintain stability. The presence of the liner may increase the resistance to fluid flow, thereby affecting the performance of the pump and causing a decrease in efficiency. Moreover, the liner is stuck inside the gear, which not only increases the overall maintenance complexity and cost, but also easily affects the output flow rate, making the overall system run unevenly, thereby affecting the normal operation and accuracy of the equipment.

[0008] To achieve the above-mentioned object, the utility model provides the following technical solution: a rear cover of a tractor gear pump with an integrated constant flow overflow function, comprising a rear pump cover housing provided on the tractor gear pump, the rear pump cover housing being connected to a constant flow valve spring seat via a combined gasket, and a constant flow spring being provided inside the constant flow valve spring seat;

[0009] The rear pump cover housing is provided with a constant flow valve core body, the bottom of the constant flow valve core body is provided with a constant flow valve core bottom surface channel, the rear pump cover housing is provided with a throttling channel, the throttling channel is connected to the constant flow valve core bottom surface channel, the constant flow valve core bottom surface channel is connected to the pressure feedback channel, the pressure feedback channel feeds back the pressure difference to the constant flow valve group;

[0010] The constant flow valve group includes an overflow plug arranged inside the constant flow valve core body, an overflow valve core is arranged under the overflow plug, the overflow valve core is arranged inside the rear pump cover housing through a pressure regulating gasket, the number of the pressure regulating gaskets can be increased or decreased, an overflow spring is provided on the outside of the overflow valve core, and a constant flow valve core body is provided at the bottom of the overflow valve core.

[0011] Preferably, the overflow plug is arranged on the constant flow valve core body through a copper pad, and the interior of the overflow plug is connected to the internal channel of the rear pump cover shell.

[0012] Preferably, the bottom inner depression of the overflow plug fits the conical protrusion on the upper end of the overflow valve core, and the inner diameter of the overflow valve core is smaller than the inner diameter of the constant flow valve core body.

[0013] Preferably, the overflow valve core is arranged inside the overflow plug and the overflow spring, the overflow valve core, the overflow plug and the overflow spring are coaxially arranged and have a sealing structure, the length of the overflow valve core is half of the overflow spring, the bottom of the overflow valve core is not connected to the constant flow valve core body, and there is a gap between the bottom of the overflow valve core and the bottom channel of the constant flow valve core.

[0014] Preferably, a pressure measuring joint is provided at the bottom of the rear pump cover housing, the pressure measuring joint is communicated with the bottom surface channel of the constant flow valve core, and a standard pressure measuring tube and a pressure gauge are connected to the pressure measuring joint.

[0015] Preferably, a T-port oil chamber is provided inside the rear pump cover housing, the T-port oil chamber is communicated with the T-port body, and the T-port body is opened in an arc shape.

[0016] Preferably, a pressure feedback oil chamber is provided at the bottom of the rear pump cover housing, a constant flow valve core oil return hole is provided on the constant flow valve core body, and the constant flow valve core oil return hole is communicated with the T-port oil chamber.

[0017] Preferably, a P-port body is provided on the rear pump cover housing, and the P-port body is connected to the P-port oil chamber. The P-port oil chamber is located at the lower end of the constant flow valve core body, and the diameter of the P-port oil chamber is larger than the diameter of the constant flow valve core body. The P-port body is provided at the side end of the P-port oil chamber, and the P-port oil chamber is connected to the throttling channel, and the throttling channel is connected to the A-port body.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: the rear cover of the tractor gear pump with integrated constant flow overflow function, the pressure oil flows from the P port body into the P port oil chamber, then flows to the A port body through the throttling channel, and flows out through the A port body, the overall operation is stable, and the problem of the overall efficiency being reduced due to the increase in resistance caused by the setting of the liner is reduced. The pressure difference in the throttling channel is fed back to the constant flow valve group through the bottom surface channel of the constant flow valve core and the pressure feedback channel, forming a closed-loop control, ensuring the stable operation of the system, and reducing the problem of uneven overall operation caused by the impact of the delivery flow. The specific contents are as follows:

[0019] The overall structure can achieve the function of constant flow output of the gear pump, improving the overall operating comfort. The pressure difference of the throttling channel is fed back to the constant flow valve group through the bottom channel of the constant flow valve core and the pressure feedback channel, reducing the problem of uneven overall operation caused by the impact of the delivery flow;

[0020] When the system pressure exceeds the set value, the overflow valve core will open and return the excess oil to the tank, thereby preventing the system from being damaged by overpressure. When the system pressure is lower than the set value, the overflow spring will reset the overflow valve core to the closed state to maintain the normal working state of the system.

[0021] When the pressure exceeds the set value of the overflow spring, the overflow valve core opens, and the pressure oil flows into the inner cavity of the constant flow valve core body, and enters the T-port oil cavity through the oil return hole of the constant flow valve core, so that the excess hydraulic oil can be returned to the oil tank through the T-port body, thereby realizing the overflow function and improving the overall safety;

[0022] To monitor system pressure, the pressurized oil in the P-port oil chamber flows through the constant flow valve core bottom channel of the constant flow valve core body to the pressure test connector. Users can connect a standard pressure measuring tube and pressure gauge to the pressure test connector to achieve real-time monitoring of the system working pressure.

[0023] The design of the pressure regulating gasket allows users to adjust the set pressure of the relief valve according to actual needs. Increasing the number of pressure regulating gaskets will increase the set pressure of the relief valve. The design of the gasket enables the system to adapt quickly to different working conditions, improving overall practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0025] Figure 2 For this utility model Figure 1 A in the middle is an enlarged structural diagram;

[0026] Figure 3 For this utility model Figure 1 The enlarged structural diagram at B in the middle;

[0027] Figure 4 This is a side view structural diagram of the utility model;

[0028] Figure 5 This is a schematic diagram of the back structure of the utility model;

[0029] Figure 6 This is a schematic diagram of the structure of the utility model when viewed from above;

[0030] Figure 7 This is a schematic diagram of the constant flow valve core structure of the utility model.

[0031] In the figure: 1. Constant flow valve spring seat; 2. Combined gasket; 3. Rear pump cover housing; 4. Constant flow spring; 5. Overflow plug; 6. Copper gasket; 7. Overflow valve core; 8. Pressure regulating gasket; 9. Overflow spring; 10. Pressure measuring joint; 11. Constant flow valve core body; 12. Throttle channel; 13. Pressure feedback channel; 14. T-port oil chamber; 15. P-port oil chamber; 16. Pressure feedback oil chamber; 17. Constant flow valve core bottom channel; 18. Constant flow valve core oil return hole; 19. A-port body; 20. P-port body; 21. T-port body. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] Example 1: In this example, in order to improve the overall operating comfort, a constant flow valve group is used to reduce the problem of uneven overall operation caused by the impact of the delivery flow, such as Figure 1-Figure 5The technical solution shown in the figure includes a rear pump cover housing 3 provided on the tractor gear pump, the rear pump cover housing 3 is connected to the constant flow valve spring seat 1 through a combination gasket 2, a constant flow spring 4 is provided inside the constant flow valve spring seat 1, a constant flow valve core body 11 is provided on the rear pump cover housing 3, a constant flow valve core bottom surface channel 17 is provided at the bottom of the constant flow valve core body 11, a throttling channel 12 is opened inside the rear pump cover housing 3, the throttling channel 12 is connected to the constant flow valve core bottom surface channel 17, the constant flow valve core bottom surface channel 17 is connected to the pressure feedback channel 13, the pressure feedback channel 13 feeds back the pressure difference to the constant flow valve group, the constant flow valve group includes a constant flow valve core body 11, a constant flow valve core bottom surface channel 17 is provided at the bottom of the constant flow valve core body 11, a throttling channel 12 is opened inside the rear pump cover housing 3, the throttling channel 12 is connected to the constant flow valve core bottom surface channel 17, the constant flow valve core bottom surface channel 17 is connected to the pressure feedback channel 13, the pressure feedback channel 13 feeds back the pressure difference to the constant flow valve group, and ... The overflow plug 5 inside the overflow valve core body 11, an overflow valve core 7 is provided under the overflow plug 5, the overflow valve core 7 is arranged inside the rear pump cover housing 3 through a pressure regulating gasket 8, the number of pressure regulating gaskets 8 can be increased or decreased, an overflow spring 9 is provided on the outside of the overflow valve core 7, a constant flow valve core body 11 is provided at the bottom of the overflow valve core 7, the overflow plug 5 is arranged on the constant flow valve core body 11 through a copper pad 6, the interior of the overflow plug 5 is connected to the internal channel of the rear pump cover housing 3, the bottom of the overflow plug 5 is concave and fits the conical protrusion of the overflow valve core 7, the inner diameter of the overflow valve core 7 is smaller than the inner diameter of the constant flow valve core body 11, the overflow valve core 7 is arranged between the overflow plug 5 and the overflow Inside the spring 9, the overflow valve core 7, the overflow plug 5 and the overflow spring 9 are coaxially arranged and have a blocking structure. The length of the overflow valve core 7 is half of the overflow spring 9. The bottom of the overflow valve core 7 is not connected to the constant flow valve core body 11, and there is a gap between the bottom of the overflow valve core 7 and the bottom channel 17 of the constant flow valve core. The design of the constant flow valve spring seat 1 is intended to facilitate the installation of the overall structure. It is stably connected to the rear pump cover housing 3 through the combined gasket 2. This connection method not only improves the stability of the overall structure, but also significantly extends its service life. When the gear pump is running, the gears in the pump body rotate to generate pressure oil, and the pressure oil is discharged from the P port body 2 0 flows into the P port oil chamber 15, then flows to the A port body 19 through the throttle channel 12, and flows out through the A port body 19. The overall operation is stable, and the problem of increased resistance due to the setting of the liner is reduced, which leads to a decrease in overall efficiency. The pressure difference in the throttle channel 12 is fed back to the constant flow valve group through the constant flow valve core bottom channel 17 and the pressure feedback channel 13, forming a closed-loop control to ensure the stable operation of the system and reduce the problem of uneven overall operation caused by the impact of the delivery flow. The overall structure can realize the constant flow function of the gear pump output flow, meet the driver's need to turn the steering wheel at different speeds, and ensure the consistency of the hand feel, thereby improving the overall comfort of operation.

[0034] Example 2: In this example, in order to improve the stability of the entire system, a constant flow valve group is used to reduce the problem of poor system stability caused by high pressure. Figure 1-Figure 5 and Figure 7As shown, a T-port oil chamber 14 is provided inside the rear pump cover housing 3, and the T-port oil chamber 14 is connected to the T-port body 21, and the T-port body 21 is opened in an arc shape. A pressure feedback oil chamber 16 is provided at the bottom of the rear pump cover housing 3, and a constant flow valve core oil return hole 18 is provided on the constant flow valve core body 11, and the constant flow valve core oil return hole 18 is connected to the T-port oil chamber 14. A P-port body 20 is provided on the rear pump cover housing 3, and the P-port body 20 is connected to the P-port oil chamber 15. The P-port oil chamber 15 is located at the lower end of the constant flow valve core body 11, and the diameter of the P-port oil chamber 15 is larger than the diameter of the constant flow valve core body 11. The P-port oil chamber 1 5 side end is provided with P port body 20, P port oil chamber 15 is connected with throttling channel 12, throttling channel 12 is connected with A port body 19, the overflow plug 5 is used to close the external structure of the valve group to prevent oil leakage, and the copper gasket 6 has good sealing and high temperature resistance, ensuring that the constant flow valve group works normally under high pressure, the overflow valve core 7 controls the maximum pressure of the system, when the system pressure exceeds the set value, the overflow valve core 7 will open, and the excess oil will flow back to the oil tank, thereby preventing the system from being damaged by overpressure, the overflow spring 9 provides the restoring force of the overflow valve core 7, when the system pressure is lower than When the set value is reached, the overflow spring 9 resets the overflow valve core 7 to the closed state to maintain the normal working state of the system. When the pressure difference in the throttle channel 12 exceeds the set value of the constant flow spring 4, the constant flow valve group will move upward, compress the constant flow spring 4, and open the passage between the P port oil chamber 15 and the T port oil chamber 14, thereby facilitating the return of excess hydraulic oil to the oil tank through the T port body 21. This process ensures the constant flow of the A port body 19 and further enhances the stability of the system. When the pressure oil of the A port body 19 pushes the front axle cylinder to the end of the stroke through the steering gear, the pressure of the A port body 19 The oil will generate pressure buildup, and this pressure reaches the pressure feedback oil chamber 16 through the pressure feedback channel 13. During this process, the pressure oil acts on the overflow valve core 7 through the small hole of the overflow plug 5. When the pressure exceeds the set value of the overflow spring 9, the overflow valve core 7 opens, and the pressure oil flows into the inner cavity of the constant flow valve core body 11, and enters the T-port oil chamber 14 through the constant flow valve core oil return hole 18. At this time, the constant flow valve group will also move up, so that the P-port oil chamber 15 is connected to the T-port oil chamber 14, which is convenient for returning excess hydraulic oil to the oil tank through the T-port body 21, thereby realizing the overflow function and improving the overall safety.

[0035] Example 3: In this embodiment, in order to improve the overall practicality, the pressure regulating gasket 8 is used to reduce the problem of poor overall adaptability caused by the inconvenience of pressure adjustment. Figure 1-Figure 7As shown, a pressure measuring joint 10 is provided at the bottom of the rear pump cover housing 3, and the pressure measuring joint 10 is connected to the bottom surface channel 17 of the constant flow valve core. A standard pressure measuring tube and a pressure gauge are connected to the pressure measuring joint 10. The number of pressure regulating gaskets 8 can be increased or decreased. In order to monitor the system pressure, the pressure oil in the P port oil chamber 15 will flow to the pressure measuring joint 10 through the bottom surface channel 17 of the constant flow valve core of the constant flow valve core body 11. The user can connect a standard pressure measuring tube and a pressure gauge to the pressure measuring joint 10 to realize real-time monitoring of the system working pressure, which is extremely important in maintenance and troubleshooting. , ensuring the normal operation of the system. At the same time, the design of the pressure-regulating gasket 8 allows the user to adjust the set pressure of the relief valve according to actual needs. The thickness of each pressure-regulating gasket 8 is 0.5mm. Therefore, increasing the number of pressure-regulating gaskets 8 will increase the set pressure of the relief valve, and vice versa. The set pressure will be reduced. This flexible design enables the system to adapt quickly to different working conditions, further improving the convenience of operation and the adaptability of the system. The contents not described in detail in this manual belong to the existing technology known to professional and technical personnel in this field.

[0036] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A tractor gear pump rear cover with an integrated constant flow overflow function, comprising a rear pump cover housing (3) arranged on the tractor gear pump, the rear pump cover housing (3) being connected to a constant flow valve spring seat (1) via a combined gasket (2), and a constant flow spring (4) being arranged inside the constant flow valve spring seat (1); It is characterized by: Also includes: The rear pump cover housing (3) is provided with a constant flow valve core body (11), the bottom of the constant flow valve core body (11) is provided with a constant flow valve core bottom surface channel (17), the rear pump cover housing (3) is provided with a throttling channel (12), the throttling channel (12) is connected to the constant flow valve core bottom surface channel (17), the constant flow valve core bottom surface channel (17) is connected to the pressure feedback channel (13), and the pressure feedback channel (13) feeds back the pressure difference to the constant flow valve group; The constant flow valve assembly comprises an overflow plug (5) arranged inside a constant flow valve core body (11), an overflow valve core (7) is arranged below the overflow plug (5), the overflow valve core (7) is arranged inside the rear pump cover housing (3) through a pressure regulating gasket (8), the number of the pressure regulating gaskets (8) can be increased or decreased, an overflow spring (9) is sleeved on the outside of the overflow valve core (7), and a constant flow valve core body (11) is arranged at the bottom of the overflow valve core (7).

2. The rear cover of a tractor gear pump with an integrated constant flow overflow function according to claim 1, characterized in that: The overflow plug (5) is arranged on the constant flow valve core body (11) via a copper pad (6), and the interior of the overflow plug (5) is connected to the internal channel of the rear pump cover housing (3).

3. The rear cover of a tractor gear pump with an integrated constant flow overflow function according to claim 1, characterized in that: The bottom of the overflow plug (5) is concave and fits the conical protrusion on the upper end of the overflow valve core (7), and the inner diameter of the overflow valve core (7) is smaller than the inner diameter of the constant flow valve core body (11).

4. The rear cover of a tractor gear pump with an integrated constant flow overflow function according to claim 1, characterized in that: The overflow valve core (7) is arranged inside the overflow plug (5) and the overflow spring (9). The overflow valve core (7), the overflow plug (5) and the overflow spring (9) are coaxially arranged and have a blocking structure. The length of the overflow valve core (7) is half of the overflow spring (9). The bottom of the overflow valve core (7) is not connected to the constant flow valve core body (11), and a gap is left between the bottom of the overflow valve core (7) and the bottom channel (17) of the constant flow valve core.

5. The rear cover of a tractor gear pump with an integrated constant flow overflow function according to claim 1, characterized in that: A pressure measuring joint (10) is provided at the bottom of the rear pump cover housing (3), the pressure measuring joint (10) is connected to the constant flow valve core bottom surface channel (17), and a standard pressure measuring tube and a pressure gauge are connected to the pressure measuring joint (10).

6. The rear cover of a tractor gear pump with an integrated constant flow overflow function according to claim 2, characterized in that: A T-port oil cavity (14) is provided inside the rear pump cover housing (3), the T-port oil cavity (14) is communicated with the T-port body (21), and the T-port body (21) is opened in an arc shape.

7. The rear cover of a tractor gear pump with an integrated constant flow overflow function according to claim 1, characterized in that: A pressure feedback oil chamber (16) is provided at the bottom of the rear pump cover housing (3), and a constant flow valve core oil return hole (18) is provided on the constant flow valve core body (11), and the constant flow valve core oil return hole (18) is connected to the T-port oil chamber (14).

8. The rear cover of a tractor gear pump with an integrated constant flow overflow function according to claim 1, characterized in that: The rear pump cover housing (3) is provided with a P-port body (20), the P-port body (20) is communicated with the P-port oil chamber (15), the P-port oil chamber (15) is located at the lower end of the constant flow valve core body (11), and the diameter of the P-port oil chamber (15) is larger than the diameter of the constant flow valve core body (11), the P-port body (20) is provided at the side end of the P-port oil chamber (15), the P-port oil chamber (15) is communicated with the throttling channel (12), and the throttling channel (12) is communicated with the A-port body (19).

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