Gear unit with a shaft end pump

Abstract

Gear unit with a shaft end pump, wherein a shaft, in particular an input shaft, drives the shaft end pump for conveying a lubricating oil flow, wherein the shaft end pump comprises a valve unit of such a kind that the direction of the lubricating oil flow conveyed by the shaft end pump is independent of the direction of rotation of the shaft of the gear unit, in particular the input shaft, driving the shaft end pump.

Description

[0001] Gearbox with a shaft end pump

[0002] Description:

[0003] The invention relates to a gearbox with a shaft end pump.

[0004] It is generally known that a gearbox is at least partially filled with lubricant.

[0005] From DE 102014207255 A1, a gear arrangement is known as the closest prior art.

[0006] A hydraulic passage for an oil pump is known from US 5901 802 A.

[0007] A hydraulic pump arrangement is known from De 102011 055 194 A1.

[0008] US Patent 2832230 A discloses a gearbox with a vertically oriented output shaft.

[0009] A lubrication system for a gearbox is known from US patent 1 717814 A.

[0010] A lubrication system for a gearbox is known from US patent 2235793 A.

[0011] A bidirectional volumetric pump is known from WO 2022 / 058442 A1.

[0012] An improvement for gear pumps is known from GB 596 170 A.

[0013] From DE 102021 002637 A1 a gearbox with a cooling arrangement and a fan is known.

[0014] The invention is therefore based on the objective of further developing a gearbox, whereby an oil lubrication circuit should be robustly implementable.

[0015] According to the invention, the problem is solved in the transmission according to the features specified in claim 1.

[0016] ISI \ EIDOPAT 17.11.2025 Important features of the invention in the gearbox with a shaft end pump are that a particularly driving shaft drives the shaft end pump to deliver a flow of lubricating oil,

[0017] wherein the shaft end pump has a valve unit such that the direction of the lubricating oil flow delivered by the shaft end pump is independent of the direction of rotation of the shaft driving the shaft end pump, in particular the driving shaft, of the gearbox.

[0018] An advantage of this is that the oil lubricant circuit within the gearbox can be operated robustly, especially regardless of the direction of rotation of the shaft driving the shaft end pump.

[0019] In a preferred embodiment, the gearbox is at least partially filled with lubricating oil. An advantage of this is that oil from the gearbox's oil sump can be used to lubricate the lubrication points, such as the shaft bearings and / or the meshing areas of the gearbox's gear teeth. This allows lubrication to be performed independently of the shaft's direction of rotation.

[0020] In a preferred design, the shaft end pump delivers the lubricating oil it has drawn in. An advantage of this design is that the shaft end pump is passive and therefore does not require a separate drive.

[0021] In an advantageous embodiment, a valve unit of the shaft pump is connected to a gear pump section of the shaft pump, in particular by means of screws. The advantage here is that although the gear pump section changes its delivery direction when the direction of rotation changes, the shaft pump of the pumped oil flow operates independently of the direction of rotation.

[0022] In an advantageous embodiment, the gear pump area has a first outlet and a second outlet, particularly for drawing in and / or pumping out the lubricating oil flow.

[0023] In particular, the gear pump section draws in lubricating oil through one of the outlets and expels it through the other, depending on the direction of rotation of the shaft. A key advantage is the simple and robust design of the gear pump section, which comprises only a first and a second gear. The first gear is directly connected to the shaft, and the second gear meshes with the first. Therefore, when the gears rotate, a suction area is created from which lubricating oil is drawn and then conveyed to the outlet. This design ensures robust operation.

[0024] In an advantageous embodiment, the first opening leads into a first opening of the valve unit that extends through to a first interior area of ​​the valve unit.

[0025] This first internal chamber can be connected to an inlet of the valve unit via a first valve and to an outlet of the valve unit via a second valve. An advantage of this design is that, depending on the rotational movement, a vacuum or a positive pressure is created in the first internal chamber, thus opening either the first valve or the second valve, while the other valve remains closed. This makes the operation robust.

[0026] In an advantageous embodiment, the second opening leads into a second opening of the valve unit that extends to a second interior area of ​​the valve unit.

[0027] This second internal chamber can be connected to the inlet of the valve unit via a third valve and to the outlet of the valve unit via a fourth valve. An advantage of this design is that, depending on the rotational movement, a vacuum or a positive pressure is created in the second internal chamber, thus opening either the third or the fourth valve, while the other valve remains closed. This ensures robust operation.

[0028] In a preferred design, the valves are each configured as check valves. The advantage here is that a simple, robust design is possible at low cost.

[0029] In an advantageous embodiment, each of the valves has a valve opening which can be closed by a cover, the cover being acted upon by a spring element towards the valve opening. It is advantageous that the valves can each be designed to be robust. In an advantageous embodiment, the valve unit is designed such that

[0030] During the first rotation of the shaft, a suction pressure draws lubricating oil into the first chamber, opening the first valve and closing the second. The gear pump section then pumps the lubricating oil drawn from the first chamber into the second chamber, causing the third valve to close and the fourth valve to open, thus expelling the lubricating oil at the outlet of the valve unit. This design offers the advantage of simple and robust operation.

[0031] In an advantageous embodiment, the valve unit is designed such that

[0032] When the shaft rotates in the opposite direction to the first, a suction pressure draws lubricating oil into the second chamber, opening the third valve and closing the fourth. The gear pump section then pumps the lubricating oil drawn from the second chamber into the first, causing the first valve to close and the second valve to open, thus expelling the lubricating oil at the outlet of the valve assembly. An advantage of this design is that the pumping direction is independent of the shaft's direction of rotation.

[0033] In an advantageous embodiment, the gear pump section comprises a housing part that radially surrounds the two meshing gears of the gear pump section and is axially connected on both sides to a respective bearing flange, each of which accommodates a bearing for the rotatable mounting of the second gear and a bearing for the rotatable mounting of the first gear. An advantage of this design is that the pumping direction is independent of the direction of rotation of the shaft.

[0034] In an advantageous embodiment, the valve unit comprises a block section connected to one of the two bearing flanges, in which the valves are housed, with each valve opening connected to the respective outlet of the gear pump section. An advantage of this design is that the shaft pump is compact and robust. In another advantageous embodiment, the block section has an inlet and outlet for the lubricating oil. Again, an advantage is that the shaft pump is compact and robust.

[0035] In an advantageous embodiment, the gearbox has a pipeline leading from the oil sump to the inlet and a pipeline leading from the outlet to a lubrication point. An advantage of this is that lubrication points located higher than the oil level of the oil sump can be supplied with lubricating oil from the oil sump. Here, "oil sump" refers to the entire quantity of oil below the oil level.

[0036] In an advantageous embodiment, a first gear is rotationally fixed to the shaft. An advantage of this is that the gear pump can be designed simply and robustly. Further advantages arise from the dependent claims. The invention is not limited to the combination of features of the claims. For those skilled in the art, further meaningful combinations of claims and / or individual claim features and / or features of the description and / or the figures will be apparent, in particular from the problem statement and / or the problem arising from a comparison with the prior art. The invention will now be explained in more detail with reference to schematic illustrations:

[0037] Figure 1 shows a sectioned view of a shaft end pump of a gearbox according to the invention.

[0038] Figure 2 shows a sectional view of the gear pump section of the shaft end pump.

[0039] Figure 3 shows the valve unit in a sectional view, with all valves closed, in particular there being no positive or negative pressure drop across the valves.

[0040] Figure 4 shows the valve position of the valve unit in a sectional view for a first direction of rotation of the shaft driving the shaft end pump.

[0041] Figure 5 shows the valve position of the valve unit in a sectional view with a different direction of rotation of the shaft driving the shaft end pump.

[0042] The transmission according to the invention, which is not shown in the figures, has a rotatably mounted shaft, in particular a driving shaft.

[0043] As shown in the figures, the shaft end pump has a gear pump section connected to a valve unit designed such that the delivery direction of the lubricating oil delivered by the shaft end pump is always the same, regardless of the direction of rotation of the shaft driving the shaft end pump.

[0044] The shaft is connected in a rotationally fixed manner to a toothed part having teeth, or has teeth, wherein the teeth are in engagement with a toothed part which is connected in a rotationally fixed manner to another shaft, in particular an intermediate shaft or a driven shaft.

[0045] Preferably, the axial end region of the shaft projects beyond the engagement area so that the shaft-end pump can be arranged at this end region. The shaft drives a first gear 5 of the gear pump section of the shaft-end pump, which meshes with a second gear 6 rotatably mounted via bearings 8. The gear pump section has a housing part 9 that radially surrounds the gears (5, 6) and is axially connected on both sides to a bearing flange 4, each of which accommodates a bearing 8 for the rotatable mounting of the second gear 6 and a bearing 7 for the rotatable mounting of the first gear 5.

[0046] The gear pump section has a first opening 30 and a second opening 31. Depending on the direction of rotation, the lubricating oil is drawn in through one of the openings (30, 31) and pumped out through the other opening (30, 31).

[0047] The first orifice 30 opens into a first opening that extends through the block part 1 of the valve unit to a first inner area of ​​the block part 1. This first inner area is connected via a first valve 2 to the inlet 34 of the valve unit and via a second valve 3 to the outlet 35 of the valve unit.

[0048] The second orifice 31 opens into a third opening that extends through the block part 1 of the valve unit to a second inner area of ​​the block part 1. This second inner area is connected via a third valve 32 to the inlet 34 of the valve unit and via a fourth valve 33 to the outlet 35 of the valve unit.

[0049] As soon as a suction pressure is built up in the first internal chamber, the first valve 2 opens and the second valve 3 closes (see Fig. 5). The gear pump section pumps the lubricating oil, which is admitted via the inlet 34 and drawn from the first internal chamber, into the second internal chamber, so that the third valve 32 closes and the fourth valve 33 (see Fig. 4) opens, thus pumping the lubricating oil out at the outlet 35.

[0050] If the direction of rotation of the shaft is reversed, a suction pressure is built up in the second interior chamber, causing the third valve 32 to open and the fourth valve 33 to close. The gear pump section pumps the lubricating oil, which is admitted via the inlet 34 and drawn from the second interior chamber, into the first interior chamber, causing the first valve 2 to close and the second valve 3 to open, thereby pumping the lubricating oil out at the outlet 35.

[0051] In further embodiments according to the invention, the valve unit is arranged at a distance from the gear pump area. Reference numeral list

[0052] 1 block section

[0053] 2 first valve

[0054] 3 second valve

[0055] 4 bearing flange

[0056] 5 gear

[0057] 6 gear

[0058] 7 warehouses

[0059] 8 bearings

[0060] 9 Housing part

[0061] 30 first mouth

[0062] 31 second mouth

[0063] 32 third valve

[0064] 33 fourth valve

[0065] 34 Admission

[0066] 35 Outlet

Claims

Patent claims:

1. Gearbox with a shaft end pump, wherein a particularly driving shaft drives the shaft end pump to deliver a flow of lubricating oil, characterized by the fact that 2. The shaft end pump has a valve unit such that the direction of the lubricating oil flow delivered by the shaft end pump is independent of the direction of rotation of the shaft driving the shaft end pump, in particular the input shaft of the gearbox.

2. Gearbox according to claim 1, characterized by the fact that the gearbox is at least partially filled with lubricating oil and / or that The shaft end pump pumps out the lubricating oil it has drawn in.

3. Transmission according to any of the preceding claims, characterized by the fact that, a valve unit of the shaft end pump is connected to a gear pump section of the shaft end pump, in particular by means of screws attached to the gear pump section of the shaft end pump.

4. Transmission according to any of the preceding claims, characterized by the fact that, especially for drawing in and / or pumping out the lubricating oil flow, the gear pump area has a first outlet and a second outlet, in particular, the gear pump section draws in the lubricating oil through one of the openings and pumps it out through the other opening, depending on the direction of rotation of the shaft.

5. Transmission according to any of the preceding claims, characterized by the fact that the first opening leads into a first opening of the valve unit that extends to a first interior area of ​​the valve unit, wherein this first interior area is connectable to an inlet of the valve unit via a first valve and to the outlet of the valve unit via a second valve.

6. Transmission according to one of the preceding claims, characterized by the fact that the second opening leads into a second opening of the valve unit, extending to a second interior area of ​​the valve unit, wherein this second interior area can be connected to the inlet of the valve unit via a third valve and to the outlet of the valve unit via a fourth valve.

7. Gearbox according to any of the preceding claims, characterized by the fact that The valves are each designed as check valves.

8. Gearbox according to any of the preceding claims, characterized by the fact that Each of the valves has a valve opening which can be closed by a cover, the cover being acted upon by a spring element towards the valve opening with spring force.

9. Gearbox according to any of the preceding claims, characterized by the fact that The valve unit is designed such that, in a first direction of rotation of the shaft, a suction pressure causes the lubricating oil to be drawn into the first internal area, causing the first valve to open and the second valve to close, wherein the gear pump section conveys the lubricating oil drawn from the first internal area into the second internal area, so that the third valve closes and the fourth valve opens, and thus the lubricating oil is conveyed out at the outlet of the valve unit.

10. Transmission according to one of the preceding claims, characterized by the fact that The valve unit is designed such that, when the direction of rotation of the shaft is reversed compared to the first direction of rotation, a suction pressure causes the lubricating oil to be drawn into the second interior area, causing the third valve to open and the fourth valve to close, with the gear pump area conveying the lubricating oil drawn from the second interior area into the first interior area, so that the first valve closes and the second valve opens, and thus the lubricating oil is conveyed out at the outlet of the valve unit.

11. Gearbox according to any of the preceding claims, characterized by the fact that The gear pump section has a housing part (9) which radially surrounds the two gears (5, 6) of the gear pump section which are in mesh with each other and which is axially connected on both sides to a respective bearing flange (4) which accommodates a respective bearing (8) for the rotatable mounting of the second gear (6) and a respective bearing (7) for the rotatable mounting of the first gear (5).

12. Gearbox according to any of the preceding claims, characterized by the fact that the valve unit has a block part which is connected to one of the two bearing flanges (4) and in which the valves are received, the respective opening being connected to the respective outlet of the gear pump area.

13. Gearbox according to any of the preceding claims, characterized by the fact that The inlet for the lubricating oil is formed on the block part, and the outlet for the lubricating oil is formed on the block part.

14. Gearbox according to any of the preceding claims, characterized by the fact that The gearbox has a pipeline leading from the oil sump to the inlet and a pipeline leading from the outlet to a lubrication point.

15. Gearbox according to one of the preceding claims, characterized in that The first of the gears is connected to the rotating shaft.

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