Speed reducer with shaft end pump

Abstract

The utility model relates to a speed reducer with a shaft end pump, in particular to an input shaft for driving the shaft end pump so as to convey lubricating oil flow, the shaft end pump is provided with a valve unit, and the valve unit enables the direction of the lubricating oil flow conveyed by the shaft end pump to be independent of the rotating direction of a shaft of the speed reducer for driving the shaft end pump, in particular to the rotating direction of the input shaft.

Description

Technical Field

[0001] The utility model relates to a speed reducer with a shaft end pump. Background Art

[0002] As is known, speed reducers are at least partially filled with a lubricant. Utility Model Content

[0003] The object of the present invention is therefore to improve a speed reducer in which the lubricating oil circuit can be designed to be robust and durable.

[0004] According to the present invention, this object is achieved by a reducer having the following features.

[0005] In terms of the reducer with a shaft end pump, an important feature of the present invention is that the input shaft drives the shaft end pump to deliver the lubricating oil flow.

[0006] The shaft end pump has a valve unit which makes the direction of the lubricating oil flow delivered by the shaft end pump independent of the rotation direction of a shaft of the reducer driving the shaft end pump, in particular an input shaft.

[0007] This has the advantage that the lubricating oil circuit within the reduction gear can be operated robustly, in particular independently of the direction of rotation of the shaft driving the stub pump.

[0008] In one advantageous embodiment, the reducer is at least partially filled with lubricating oil. This advantageously allows oil to be diverted from the reducer's oil sump to lubricate lubrication points, such as shaft bearings and / or gear meshing areas of the reducer. Lubrication thus occurs independently of the shaft's direction of rotation.

[0009] In an advantageous embodiment, the shaft end pump pumps out the lubricating oil drawn in by the shaft end pump. An advantage here is that the shaft end pump is passively configured and therefore does not require a separate, independent drive.

[0010] In an advantageous embodiment, the valve unit of the shaft end pump is connected to the gear pump region of the shaft end pump, in particular fastened thereto by means of screws. This has the advantage that, although the gear pump region changes the delivery direction when the direction of rotation changes, the shaft end pump, which delivers the oil flow, operates independently of the direction of rotation.

[0011] In an advantageous embodiment, in particular for the intake and / or discharge of the lubricating oil flow, the gear pump region has a first opening and a second opening.

[0012] In particular, the gear pump area draws lubricating oil in through one of the openings, depending on the direction of rotation of the shaft, and discharges the lubricating oil through the other opening. This has the advantage of a simple and robust design of the gear pump in the gear pump area. The gear pump comprises only a first gear and a second gear, and the first gear is connected to the shaft in a rotationally fixed manner. The second gear meshes with the first gear. Consequently, during the rotational movement of the gears, a suction area is formed, from which lubricating oil is drawn and then delivered to the outlet. This ensures stable operation.

[0013] In an advantageous embodiment, the first opening opens into a first opening of the valve unit, and the first opening extends to a first interior region of the valve unit.

[0014] The first interior region can be connected to the inlet of the valve unit via a first valve and to the outlet of the valve unit via a second valve. This has the advantage that, due to the rotational movement, a negative pressure or an overpressure is generated in the first interior region, and thus the first valve or the second valve opens, while the other valve remains closed. This allows for stable operation.

[0015] In an advantageous embodiment, the second opening opens into a second opening of the valve unit, and the second opening extends to a second interior region of the valve unit.

[0016] The second interior region can be connected to the inlet of the valve unit via the third valve and to the outlet of the valve unit via the fourth valve. This has the advantage that, depending on the rotational movement, negative pressure or positive pressure is generated in the second interior region, and the third or fourth valve opens accordingly, while the other valve remains closed. This allows for stable operation.

[0017] In an advantageous embodiment, the valves are each designed as non-return valves. Advantageously, a simple, robust embodiment can be achieved cost-effectively.

[0018] In an advantageous embodiment, each valve in the valves has a valve opening which can be closed by a closure cover, wherein the closure cover is loaded with a spring force toward the valve opening by a spring element. The advantage here is that the valves can be constructed robustly and durably.

[0019] In one advantageous embodiment, the valve unit is configured such that, in a first rotational direction of the shaft, the suction pressure causes lubricating oil to be drawn into the first interior region, the first valve opens, and the second valve closes. The gear pump region delivers the lubricating oil drawn from the first interior region to the second interior region, closing the third valve and opening the fourth valve, so that the lubricating oil is discharged at the outlet of the valve unit. This advantageously allows for a simple and stable operation.

[0020] In one advantageous embodiment, the valve unit is configured such that, when the shaft rotates in a direction opposite to the first direction of rotation, the suction pressure causes lubricating oil to be drawn into the second interior region, the third valve opens, and the fourth valve closes. The gear pump region delivers the lubricating oil drawn from the second interior region to the first interior region, closing the first valve and opening the second valve, so that the lubricating oil is discharged at the outlet of the valve unit. This advantageously allows the delivery direction to be independent of the shaft's direction of rotation.

[0021] In one advantageous embodiment, the gear pump region comprises a housing part which radially surrounds the two meshing gears of the gear pump region. The housing part is connected axially on both sides to respective bearing flanges, which respectively accommodate respective bearings for rotatably supporting the second gear and a bearing for rotatably supporting the first gear. This has the advantage that the delivery direction is independent of the direction of rotation of the shaft.

[0022] In one advantageous embodiment, the valve unit comprises a block / module component which is connected to one of the two bearing flanges and in which the valve is accommodated, wherein the corresponding opening is connected to the corresponding bore in the gear pump region. This has the advantage that the shaft end pump is compact and robust.

[0023] In an advantageous embodiment, an inlet for the lubricating oil is formed on the block, and an outlet for the lubricating oil is formed on the block. This has the advantage that the shaft end pump is compact and robust.

[0024] In one advantageous embodiment, the gear unit has a line leading from the oil sump to the inlet and a line leading from the outlet to the lubrication points. This has the advantage that lubrication points above the oil level of the oil sump can be supplied with lubricating oil from the oil sump. In this context, the term "oil sump" refers to the total amount of oil below the oil level.

[0025] In an advantageous embodiment, a first gear of the gears is connected to the shaft in a rotationally fixed manner. Advantageously, the gear pump can be constructed simply and robustly.

[0026] The present invention is not limited to the above-mentioned feature combinations. For those skilled in the art, in particular based on the objectives proposed and / or the objectives proposed by comparison with the prior art, other reasonable combinations of the above-mentioned feature combinations and / or individual features and / or the features to be described below and / or the features of the accompanying drawings may be obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Now describe the utility model in detail according to the schematic diagram:

[0028] exist Figure 1 Detailed description of the drawings is given in FIG. 1 , which is a cross-sectional view of the shaft end pump of the reducer according to the present invention.

[0029] exist Figure 2 A cross-section through the gear pump area of ​​a shaft end pump is shown in FIG.

[0030] exist Figure 3 , a sectional view of a valve unit is shown, wherein all valves are in the closed state, ie in particular no positive or negative pressure difference is acting on the valves.

[0031] exist Figure 4 1 shows a sectional view of the valve position of the valve unit in a first direction of rotation of the shaft driving the stub pump.

[0032] exist Figure 5 The valve position of the valve unit is shown in a sectional view in the other direction of rotation of the shaft driving the stub pump.

[0033] List of reference numerals:

[0034] 1 block component

[0035] 2First valve

[0036] 3 Second valve

[0037] 4 bearing flange

[0038] 5First gear

[0039] 6 Second gear

[0040] 7First bearing

[0041] 8 Second bearing

[0042] 9 housing parts

[0043] 30 First orifice

[0044] 31 Second orifice

[0045] 32 Third valve

[0046] 33 Fourth valve

[0047] 34 Entrance

[0048] 35 Exit DETAILED DESCRIPTION

[0049] The reduction gear according to the invention, which is not shown in the drawings, has a rotatably mounted shaft, in particular an input shaft.

[0050] As shown in the figures, the shaft end pump has a gear pump region which is connected to a valve unit which is 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.

[0051] The shaft is connected in a rotationally fixed manner to a toothed element having a toothing, or the shaft has a toothing which meshes with a toothed element which is connected in a rotationally fixed manner to another shaft, in particular an intermediate shaft or an output shaft.

[0052] Preferably, the axial end region of the shaft projects beyond the meshing region so that a shaft end pump can be arranged therein. The shaft drives a first gear 5 in the gear pump region of the shaft end pump, which meshes with a second gear 6 rotatably supported by a second bearing 8.

[0053] Here, the gear pump area has a housing part 9, which surrounds the gears 5, 6 in the circumferential direction and is connected to a bearing flange 4 on both axial sides, which respectively accommodates a second bearing 8 for rotatably supporting the second gear 6 and a first bearing 7 for rotatably supporting the first gear 5.

[0054] The gear pump region has a first opening 30 and a second opening 31. Depending on the direction of rotation, lubricating oil is sucked in through one of the openings 30, 31 and discharged through the other opening 30, 31.

[0055] The first orifice 30 opens into a first opening extending through the block 1 of the valve unit to a first interior region of the block 1. The first interior region is connected to the inlet 34 of the valve unit via the first valve 2 and to the outlet 35 of the valve unit via the second valve 3.

[0056] The second orifice 31 opens into a third opening which extends through the block 1 of the valve unit to a second interior region of the block 1. The second interior region is connected to an inlet 34 of the valve unit via a third valve 32 and to an outlet 35 of the valve unit via a fourth valve 33.

[0057] As soon as suction pressure builds up in the first interior region, the first valve 2 opens and the second valve 3 closes. The gear pump region pumps the lubricating oil, which enters via the inlet 34 and is drawn in from the first interior region, into the second interior region, closing the third valve 32 and opening the fourth valve 33 so that the lubricating oil is discharged at the outlet 35.

[0058] If the direction of rotation of the shaft is reversed, suction pressure builds up in the second interior region, and as a result, the third valve 32 opens and the fourth valve 33 closes. The gear pump region pumps the lubricating oil, which enters via the inlet 34 and is drawn in from the second interior region, into the first interior region, causing the first valve 2 to close and the second valve 3 to open, whereby the lubricating oil is discharged at the outlet 35.

[0059] In further exemplary embodiments according to the present invention, the valve unit is arranged spaced apart from the gear pump region.

Claims

1. A reducer with a shaft end pump, The input shaft drives the shaft end pump to deliver lubricating oil flow. It is characterized in that The shaft end pump has a valve unit which makes the direction of the flow of lubricating oil delivered by the shaft end pump independent of the rotation direction of the input shaft of the speed reducer which drives the shaft end pump.

2. The reducer with a shaft end pump according to claim 1, It is characterized in that The reducer is at least partially filled with lubricating oil, and / or, The shaft end pump outputs the lubricating oil sucked in by the shaft end pump.

3. The reducer with a shaft end pump according to claim 1 or 2, It is characterized in that The valve unit of the shaft end pump is fastened to the gear pump region of the shaft end pump by means of screws.

4. The reducer with a shaft end pump according to claim 3, It is characterized in that For the intake and / or discharge of the lubricating oil flow, the gear pump region has a first opening and a second opening. The gear pump region draws in lubricating oil via one of the first port and the second port based on the rotational direction of the input shaft and discharges the lubricating oil via the other port.

5. The reducer with a shaft end pump according to claim 4, It is characterized in that The first orifice opens into a first opening of the valve unit, the first opening extending to a first interior region of the valve unit, The first interior region can be connected to an inlet of the valve unit via a first valve and can be connected to an outlet of the valve unit via a second valve.

6. The reducer with a shaft end pump according to claim 5, It is characterized in that The second orifice opens into a second opening of the valve unit, the second opening extending to a second inner cavity region of the valve unit, The second interior area can be connected to the inlet of the valve unit via a third valve and can be connected to the outlet of the valve unit via a fourth valve.

7. The reducer with a shaft end pump according to claim 6, It is characterized in that The first valve, the second valve, the third valve and the fourth valve are respectively designed as check valves.

8. The reducer with a shaft end pump according to claim 6, It is characterized in that Each of the first valve, the second valve, the third valve and the fourth valve has a valve opening which can be closed by a closing cover which is spring-loaded toward the valve opening by a spring element.

9. The reducer with a shaft end pump according to claim 6, It is characterized in that The valve unit is constructed so that in a first rotational direction of the input shaft, the suction pressure causes the lubricating oil to be sucked into the first inner chamber area, causing the first valve to open and the second valve to close, wherein the gear pump area transports the lubricating oil sucked from the first inner chamber area to the second inner chamber area, causing the third valve to close and the fourth valve to open, so that the lubricating oil is discharged at the outlet of the valve unit.

10. The reducer with a shaft end pump according to claim 9, It is characterized in that The valve unit is constructed so that when the rotation direction of the input shaft is opposite to the first rotation direction, the suction pressure causes the lubricating oil to be sucked into the second inner chamber area, causing the third valve to open and the fourth valve to close, wherein the gear pump area transports the lubricating oil sucked from the second inner chamber area to the first inner chamber area, causing the first valve to close and the second valve to open, so that the lubricating oil is discharged at the outlet of the valve unit.

11. The reducer with a shaft end pump according to claim 6, It is characterized by: The gear pump region comprises a housing component (9), which radially surrounds a first gear (5) and a second gear (6) of the gear pump region that mesh with each other, and is connected to corresponding bearing flanges (4) on both axial sides, the bearing flanges respectively receiving a second bearing (8) for rotatably supporting the second gear (6) and a first bearing (7) for rotatably supporting the first gear (5).

12. The reducer with a shaft end pump according to claim 11, It is characterized by: The valve unit comprises a block component which is connected to one of the two bearing flanges (4) and in which a first valve, a second valve, a third valve and a fourth valve are accommodated, wherein the respective first opening is connected to the respective first orifice in the gear pump area and the respective second opening is connected to the respective second orifice in the gear pump area.

13. The reducer with a shaft end pump according to claim 12, It is characterized by: An inlet for lubricating oil is formed on the block component, and an outlet for lubricating oil is formed on the block component.

14. The reducer with a shaft end pump according to claim 1 or 2, It is characterized by: The speed reducer has a conduit leading from the oil sump to the inlet and a conduit leading from the outlet to the lubrication point.

15. The reducer with a shaft end pump according to claim 11, It is characterized by: The first gear is connected to the input shaft in a relatively rotationally fixed manner.

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