Digital power reversing control valve for agricultural machinery

Abstract

The utility model discloses a kind of agricultural machinery digital power commutation control valve, respectively with commutation push rod and oil pump communication, comprising: digital valve, pressure reducing valve, shell, the digital valve and pressure reducing valve are located in the inside of shell;The oil inlet of the pressure reducing valve is communicated with oil pump by being equipped on the oil inlet of shell, the oil outlet of the pressure reducing valve is communicated with the oil inlet of digital valve, for providing stable oil inlet pressure, the first oil outlet and second oil outlet of the digital valve are respectively communicated with commutation push rod, for switching the oil inlet of digital valve and first oil outlet and second oil outlet one of communication;Beneficial effect: open first oil outlet and second oil outlet one of oil outlet, when advancing or retreating clutch is about to separate, the opening speed of digital valve core is realized by electric control logic control, clutch slow combination is realized, reach tractor gentle start.

Description

Technical Field

[0001] This utility model relates to the field of gear shifting and reversing, and in particular to a digital power reversing control valve for agricultural machinery. Background Technology

[0002] The shifting mechanism of a tractor includes a shift fork, a shift fork shaft, and a gear lever. Typically, the shift fork and shift fork shaft are located inside the gearbox housing, above the drive shaft. A lever connected to the gear lever is inserted into a shift head on the shift fork shaft. The lever pushes the shift fork shaft, which in turn drives the shift fork to push the sliding gear located on the drive shaft to move back and forth, engaging with different gears to change the direction of power output.

[0003] However, when shifting gears on agricultural machinery, which is still done manually, jerking is likely to occur. Utility Model Content

[0004] Purpose of the utility model: The purpose of this utility model is to solve the problems in the prior art and provide a digital power reversing control valve for agricultural machinery.

[0005] Technical solution: A digital power reversing control valve for agricultural machinery is proposed, which is connected to the reversing push rod and the oil pump respectively, including:

[0006] A digital valve, a pressure reducing valve, and a housing, wherein the digital valve and the pressure reducing valve are located inside the housing;

[0007] The oil inlet of the pressure reducing valve is connected to the oil pump through an oil inlet provided on the housing, and the oil outlet of the pressure reducing valve is connected to the oil inlet of the digital valve to provide a stable oil inlet pressure. The first oil outlet and the second oil outlet of the digital valve are respectively connected to the reversing push rod to switch the oil inlet of the digital valve to one of the first oil outlet and the second oil outlet.

[0008] The return ports of the digital valve and the pressure reducing valve are connected to the first unloading port located on the outer casing.

[0009] Preferably, the oil inlet of the pressure reducing valve is also connected to a logic valve, the oil outlet of the logic valve is connected to the lubrication outlet on the housing, and the oil return end is connected to the first oil discharge port on the housing.

[0010] Preferably, the outer casing is further provided with a second oil discharge port, the oil outlet of the logic valve is also connected to a one-way valve, and the other end of the one-way valve is connected to the second oil discharge port.

[0011] Preferably, the reversing push rod includes a first cylinder and a first piston push rod, the first piston push rod passing through the first cylinder in cooperation with it, the first oil outlet being connected to one end of one side of the first cylinder, and the second oil outlet being connected to the other end of one side of the first cylinder.

[0012] Preferably, the reversing push rod includes a second cylinder, a second piston push rod, a third cylinder, and a third piston push rod.

[0013] The second piston push rod penetrates the second cylinder in cooperation with the first oil outlet and one end of the second cylinder on one side. The second cylinder is equipped with a first spring that is respectively connected to the piston push rod and one end of the second cylinder.

[0014] The third piston push rod is connected to the third cylinder, the second oil outlet is connected to one end of the third cylinder, and a second spring is connected inside the third cylinder to the piston push rod and one end of the third cylinder respectively.

[0015] Preferably, the oil inlet end of the outer casing is connected to an energy accumulator.

[0016] Preferably, the oil inlet section of the housing is connected to a temperature sensor.

[0017] Preferably, the pressure limiting valve has a pressure limit of 18 bar.

[0018] Preferably, the logic valve limits the pressure at the lubrication outlet to 22 bar.

[0019] Preferably, the one-way valve is limited to a maximum of 3 bar. Beneficial effects

[0020] Controlled by hydraulic oil, when the tractor stops and starts moving forward or backward, the valve core of the digital valve is controlled to open from the middle position to the A / B chamber, so as to open one of the first oil outlet and the second oil outlet. When the clutch is about to disengage in forward or backward movement, the opening speed of the digital valve core is controlled by the electronic control logic to achieve slow engagement of the clutch, so as to achieve a smooth start of the tractor.

[0021] When the tractor switches from forward (reverse) to backward (forward), the valve core of the digital valve is opened from end a (b) to end b (a). The electronic control logic controls the combination of fast and slow switching speeds of the digital valve core to achieve rapid stopping, short pauses, and slow clutch engagement of the tractor. This ensures that the power of the tractor is not interrupted and there is no jerking during the gear shifting process, thus realizing the power reversal of the tractor. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of this utility model;

[0023] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of this utility model.

[0024] Figure label:

[0025] 1. Digital valve; 2. Pressure reducing valve; 3. Housing; 4. First oil outlet; 5. Second oil outlet; 6. Logic valve; 7. First unloading port; 8. Second unloading port; 9. First cylinder; 10. First piston rod; 11. Second cylinder; 12. Second piston rod; 13. Third cylinder; 14. Third piston rod; 15. First spring; 16. Second spring; 17. Check valve. Detailed Implementation

[0026] To make the technical solution of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. Example

[0027] To make the technical solution of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "comprising" and similar expressions used herein mean that the element or object preceding the word covers the element or object listed following the word and its equivalents, but does not exclude other elements or objects.

[0029] In response to the problems existing in the current technology, combined with Figure 1-2 A digital power reversing control valve for agricultural machinery, connected to a reversing push rod and an oil pump respectively, characterized in that it includes:

[0030] Digital valve 1, pressure reducing valve 2, and housing 3, wherein the digital valve 1 and pressure reducing valve 2 are disposed inside the housing 3;

[0031] The oil inlet of the pressure reducing valve 2 is connected to the oil pump through an oil inlet provided on the housing 3, and the oil outlet of the pressure reducing valve 2 is connected to the oil inlet of the digital valve 1 to provide a stable oil inlet pressure. The first oil outlet 4 of the digital valve 1 ( Figure 1 (A) and second oil outlet 5 ( Figure 1 B) is connected to the reversing push rod respectively, and is used to switch the oil inlet (P) of digital valve 1 to one of the first oil outlet 4 and the second oil outlet 5;

[0032] The return ports of the digital valve 1 and the pressure reducing valve 2 are connected to the first unloading port 7 located on the outer casing 3.

[0033] Specifically, hydraulic oil is output through an oil pump, and then passes through pressure reducing valve 2 and digital valve 1;

[0034] When the hydraulic oil passes through the pressure reducing valve 2, it ensures that the hydraulic oil passing through the pressure reducing valve 2 maintains a certain stable pressure, avoiding the situation where the hydraulic oil pressure passing through the digital valve 1 is too high, thus making the control more stable.

[0035] When hydraulic oil passes through digital valve 1, the input hydraulic oil is switched via an external electric control to either the first outlet port 4 or the second outlet port 5. When the first outlet port 4 is connected to the inlet port (P) of digital valve 1, the second outlet port 5 is connected to the return port (T) of digital valve 1. When the first outlet port 4 is connected to the return port of digital valve 1, the second outlet port 5 is connected to the inlet port of digital valve 1.

[0036] Then, it switches whether oil is discharged from the first oil outlet 4 or the second oil outlet 5. When oil is discharged from the first oil outlet 4, oil is returned from the second oil outlet 5, and when oil is discharged from the second oil outlet 5, oil is returned from the first oil outlet 4. During the oil discharge, the reversing push rod is driven. The reversing push rod pushes the valve rod in the gearbox in two directions, thereby adjusting the gear and reversing the agricultural machinery.

[0037] In some specific embodiments, the oil inlet of the pressure reducing valve 2 is also connected to a logic valve 6, the oil outlet of the logic valve 6 is connected to the lubrication outlet on the housing 3, and the oil return end of the pressure reducing valve 2 is connected to the first oil discharge port 7 on the housing 3.

[0038] Specifically, the logic valve 6 limits the maximum pressure in the oil circuit to pass through the lubrication outlet T4, thus providing a separate lubrication effect for the existing lubrication system.

[0039] In some specific embodiments, the outer casing 3 is also provided with a second oil discharge port 8, the oil outlet end of the logic valve 6 is also connected to a one-way valve 17, and the other end of the one-way valve 17 is connected to the second oil discharge port 8.

[0040] Specifically, the check valve 17 acts as a barrier to the hydraulic oil, but by setting a certain limit on the check valve 17, the hydraulic oil in the lubrication system will not exceed a certain limit. When the limit of the check valve 17 is exceeded, the hydraulic oil will flow in reverse through the check valve 17 and the second discharge port 8 (T2) to maintain the stability of the lubrication system.

[0041] In some specific embodiments, the reversing push rod includes a first cylinder 9 and a first piston push rod 10, the first piston push rod 10 cooperating to penetrate the first cylinder 9, the first oil outlet 4 being connected to one end of the first cylinder 9, and the second oil outlet 5 being connected to the other end of the first cylinder 9.

[0042] Specifically, in one embodiment of the reversing push rod, a reversing push rod, such as Figure 1 As shown, when the first oil outlet 4 is open, oil is discharged, which squeezes the first piston push rod 10 and pushes the gearbox to shift gears in one direction. At this time, the first cylinder 9 is filled with hydraulic oil. The hydraulic oil on the other side of the first piston push rod 10 flows back to the digital valve 1 through the second oil outlet 5. Conversely, when the second oil outlet 5 is open and oil is discharged, the first piston push rod 10 slides in the opposite direction, and the valve rod of the gearbox is pushed in the other direction to achieve gear shifting. The gear shifting is smooth.

[0043] In some specific embodiments, when using a reversing push rod in one embodiment, another reversing push rod is used, such as Figure 2 As shown, Figure 2 The second cylinder 11 and the third cylinder 13 shown do not represent their specific actual placement relationship. The reversing push rod includes the second cylinder 11, the second piston push rod 12, the third cylinder 13, and the third piston push rod 14.

[0044] The second piston push rod 12 is connected to the second cylinder 11. The first oil outlet 4 and one end of the second cylinder 11 are connected. The second cylinder 11 is equipped with a first spring 15 that is connected to the piston push rod and one end of the second cylinder 11 respectively.

[0045] The third piston push rod 14 is connected to the third cylinder 13. The second oil outlet 5 is connected to one end of the third cylinder 13. The third cylinder 13 is equipped with a second spring 16 that is connected to the piston push rod and one end of the third cylinder 13 respectively.

[0046] Specifically, in some embodiments, two different reversing push rods are controlled by the first oil outlet 4 and the second oil outlet 5 respectively. The second piston push rod 12 controls the valve rod in the gearbox to slide in one gear direction (e.g., forward gear), and the third piston push rod 14 controls the valve rod in the gearbox to slide in another gear direction (e.g., reverse gear).

[0047] When oil is discharged from the first oil outlet 4, the first piston push rod 10 pushes the valve rod inside the gearbox to shift gears. At the same time, the second spring 16 and the valve rod's movement force cause the second piston push rod 12 to retract, causing the hydraulic oil in the third cylinder 13 to flow back to the logic valve 6. The reverse is also true.

[0048] In some specific embodiments, the oil inlet end of the outer casing 3 is connected to an energy accumulator for energy storage.

[0049] In some specific embodiments, the oil inlet section of the outer casing 3 is connected to a temperature sensor for temperature detection.

[0050] In some specific embodiments, the pressure reducing valve 2 has a pressure limit of 18 bar, used to limit the pressure to 18 bar.

[0051] In some specific embodiments, the logic valve 6 limits the pressure at the lubrication outlet to 22 bar, which is used to set the maximum pressure at the lubrication outlet to 22 bar.

[0052] In some specific embodiments, the one-way valve 17 is limited to a maximum of 3 bar, and the one-way valve 17 is bypassed to return to the oil tank through the second unloading port to limit the maximum pressure of the lubrication system to no more than 3 bar.

[0053] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A digital power reversing control valve for agricultural machinery, connected to a reversing push rod and an oil pump respectively, used to shift gears by pushing a gearbox valve rod through the reversing push rod, characterized in that, include: A digital valve (1), a pressure reducing valve (2), and a housing (3), wherein the digital valve (1) and the pressure reducing valve (2) are located inside the housing (3); The oil inlet of the pressure reducing valve (2) is connected to the oil pump through the oil inlet provided on the housing (3), and the oil outlet of the pressure reducing valve (2) is connected to the oil inlet of the digital valve (1) to provide stable oil inlet pressure. The first oil outlet (4) and the second oil outlet (5) of the digital valve (1) are respectively connected to the reversing push rod to switch the oil inlet of the digital valve (1) to one of the first oil outlet (4) and the second oil outlet (5). The return ports of the digital valve (1) and the pressure reducing valve (2) are connected to the first unloading port (7) located on the outer casing (3).

2. The agricultural machinery digital power reversing control valve according to claim 1, characterized in that, The oil inlet of the pressure reducing valve (2) is also connected to a logic valve (6), the oil outlet of the logic valve (6) is connected to the lubrication outlet on the housing (3), and the oil return end of the logic valve (6) is connected to the first oil discharge port (7) on the housing (3).

3. The agricultural machinery digital power reversing control valve according to claim 2, characterized in that, The outer casing (3) is also provided with a second oil discharge port (8), and the oil outlet end of the logic valve (6) is also connected to the one-way valve (17), and the other end of the one-way valve (17) is connected to the second oil discharge port (8).

4. The agricultural machinery digital power reversing control valve according to claim 1, characterized in that, The reversing push rod includes a first cylinder (9) and a first piston push rod (10). The first piston push rod (10) passes through the first cylinder (9) in cooperation with it. The first oil outlet (4) is connected to one end of the first cylinder (9), and the second oil outlet (5) is connected to the other end of the first cylinder (9).

5. The agricultural machinery digital power reversing control valve according to claim 1, characterized in that, The reversing push rod includes a second cylinder (11), a second piston push rod (12), a third cylinder (13), and a third piston push rod (14). The second piston push rod (12) is connected to the second cylinder (11). The first oil outlet (4) is connected to one end of the second cylinder (11). The second cylinder (11) is equipped with a first spring (15) that is connected to one end of the second piston push rod (12) and the second cylinder (11). The third piston push rod (14) is connected to the third cylinder (13), the second oil outlet (5) is connected to one end of the third cylinder (13), and a second spring (16) is connected inside the third cylinder (13) and is respectively connected to the third piston push rod (14) and one end of the third cylinder (13).

6. The agricultural machinery digital power reversing control valve according to claim 1, characterized in that, An accumulator is connected to the oil inlet end of the outer casing (3).

7. The agricultural machinery digital power reversing control valve according to claim 1, characterized in that, The oil inlet section of the outer casing (3) is connected to a temperature sensor.

8. The agricultural machinery digital power reversing control valve according to claim 1, characterized in that, The pressure limiting valve (2) has a pressure limit of 18 bar.

9. The agricultural machinery digital power reversing control valve according to claim 2, characterized in that, The logic valve (6) limits the pressure at the lubrication outlet to 22 bar.

10. The agricultural machinery digital power reversing control valve according to claim 3, characterized in that, The maximum limit of the one-way valve (17) is 3 bar.

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