Oil retaining ring with axial through holes; planetary gear

Abstract

The invention relates to an oil retaining ring (1) for a planetary gear (2) of a drive train, which has a ring body (3) in which at least one oil guide hole (4) is provided for guiding oil from one end face (5) of the ring body (3) to another end face (6) of the ring body (3), wherein at least one oil retaining vane (7) is arranged on one end face (5) such that, during rotation of the oil retaining ring (3) in operation, it forces oil through the oil guide hole (4). The invention also relates to a planetary gear (2) for use in a drive train of a motor vehicle.

Description

[0001] The invention relates to an oil retaining ring for a planetary gear of a drive train, for use in a motor vehicle, such as a passenger car or a commercial vehicle, which has a ring body in which at least one oil guide hole is provided for conveying oil from one end face of the ring body to another end face of the ring body.

[0002] The object of the present invention is to improve the known planetary gear system by providing a lubricant supply.

[0003] In the invention, this is achieved in an oil trap ring as presented above by arranging at least one oil trap wing on one end face in such a way that, when the oil trap ring rotates during operation, it forces oil to pass through an oil guide hole.

[0004] In other words, the invention relates to an oil separator ring for the sun shaft of a planetary gear unit, which is geometrically modeled on a fan or propeller. The oil separator ring thus geometrically resembles an oil propeller.

[0005] The oil trap ring directs a cooling fluid, such as oil, to a rolling bearing. This function is ensured by the shape of at least one vane / wing provided on the oil trap ring. The vanes / wings of the oil trap ring are preferably oriented towards the center of the sunburst.

[0006] Advantageous embodiments are claimed in the dependent claims and are explained in more detail below.

[0007] In the context of the explanation of the embodiments, the directional specifications refer to the oil retaining ring. The radial and tangential / circumferential directions are defined by the oil retaining ring. The axial direction is defined perpendicular to the radial direction.

[0008] It has proven advantageous to have multiple oil guide holes and multiple oil catch vanes.

[0009] The design of the oil trap ring with oil trap wings advantageously allows the cooling fluid, preferably oil, to pass through the oil trap ring. This passage of the oil through the oil trap ring enables the transport of the fluid from the installation space on the side of the oil trap ring at least as far as the sunburst.

[0010] It is also advantageous if the solar wave is designed with at least one, preferably several, through-holes or bores. The number and position of the at least one / the preferably several through-holes preferably correspond to the number and position of the oil guide holes.

[0011] This means that the through-holes of the sun shaft represent an extension of the oil guide holes in the axial direction. This structural feature advantageously allows the oil to flow from a first axial side of the sun shaft, preferably facing an oil supply / lubrication source, to a second axial side, preferably facing a rolling bearing.

[0012] The oil guide holes are preferably evenly distributed around the circumference of the oil retaining ring. This embodiment advantageously allows the oil flow to be divided among the individual oil guide holes. The diameter of the oil guide holes is preferably predetermined and variable depending on the design of the planetary gear and the oil volume to be conveyed.

[0013] The design of the oil trap ring with at least one, but preferably several, oil trap wings advantageously allows the oil supplied via the lubrication source to be collected and directed to the oil guide holes. This collection and directing of the oil enables a low-waste supply of oil to the oil guide holes.

[0014] The oil separator vanes are preferably evenly distributed around the circumference. This advantageously ensures a uniform distribution of the oil onto the oil guide holes.

[0015] Furthermore, it is advantageous if an oil trap wing is provided for each oil guide hole.

[0016] By assigning each oil guide hole to an oil trap wing, it is advantageously possible to ensure that each oil guide hole can be supplied with oil by exactly one of the oil trap wings, which are evenly distributed around the circumference. The oil guide holes of the oil trap ring are thus preferably supplied with the same or approximately the same volume of oil. This preferably results in the technical effect of equal flow rates for each oil guide hole.

[0017] Furthermore, it is advantageous if at least one oil trap wing or all oil trap wings are curved outwards in an arc.

[0018] By means of the embodiment of at least one or preferably all oil trap wings with an arc-shaped, outwardly curved geometry, it is possible to direct the oil to the at least one, preferably several, oil guide holes in a manner advantageous with regard to the flow rate of the oil.

[0019] Furthermore, the collection and guiding of the oil via the arc shape, taking advantage of forces acting on the oil during the rotation of the sun wave, preferably radially acting forces, preferably acceleration forces, are advantageously facilitated.

[0020] Furthermore, it has proven advantageous if the oil trap wing surrounds the oil guide hole at least partially.

[0021] By partially surrounding the oil guide hole, preferably on its radial outer surface, a preferably low-loss flow of oil to the at least one oil guide hole and collection of the oil in the area of ​​the oil trap wing surrounding the at least one oil guide hole during operation of the planetary gear is advantageously achieved. This advantage results in the effect of improved flow of the collected oil through the at least one oil guide hole.

[0022] Furthermore, it is advantageous if the oil trap wing is bent towards the center of the oil trap ring.

[0023] By bending the oil trap wing towards the center of the oil trap ring and / or by having an L-shaped design of the oil trap wing, it is advantageously possible to utilize the preferably centrifugal forces that occur during the operation of the planetary gear.

[0024] Furthermore, it is advantageous if the oil trap ring is designed as a closed ring.

[0025] This embodiment of the oil trap ring, or the embodiment of the oil trap ring as a ring segment or as a disc body, advantageously allows the oil trap ring to be attached to the solar shaft in a favorable manner for mounting purposes. The diameter of the central hole of the oil trap ring is advantageously adaptable to the diameter of a shaft / hollow shaft section of the solar shaft.

[0026] Furthermore, the oil trap ring is preferably designed to rest against the axial end face of the solar shaft, and more preferably for flush axial contact. This embodiment of the oil trap ring advantageously avoids oil losses resulting from non-flush axial contact of the oil trap ring against an end face of the solar shaft. This advantage allows for improved resource efficiency with regard to the oil resource by eliminating leakage sources. The oil trap ring is also preferably supported on the solar shaft.

[0027] The oil trap ring, designed as a closed ring or ring segment, is preferably manufactured as a metallic component or, even more preferably, as a plastic component. Particularly advantageous is the plastic embodiment of the oil trap ring, which results in reduced manufacturing costs.

[0028] The described embodiments of the oil trap ring make it advantageously possible, with a view to saving axial installation space, to arrange the oil trap ring in the area of ​​the end face, i.e. between the sunburst wave and a wider toothed area, preferably further spaced axially on both sides from the web of the toothing.

[0029] Furthermore, it is advantageous if the oil trap ring is designed as a separate component of a sun shaft or as an integral part of the sun shaft.

[0030] By designing the oil trap ring either as a separate component or as an integral part, it is advantageously possible to adapt the oil trap ring to the available installation space. Furthermore, it is conceivable that the oil trap ring could be advantageously integrated into the sunburst shape, resulting in a reduced number of components.

[0031] In accordance with the disclosed oil trap ring, the oil trap ring can be advantageously attached to a preferably end face of the sun gear using fasteners / bonding agents / joining agents. Screwing or bonding the oil trap ring to, or preferably onto, the end face of the sun gear is advantageous with regard to precise positioning and simple assembly.

[0032] Particularly with regard to the design of the oil trap ring as a plastic part, bonding the oil trap ring to the end face of the sun wave is advantageously easy to implement in terms of joining technology / connection technology.

[0033] Also presented is a planetary gear for use in a drive train of a motor vehicle, with a sun shaft, which has at least one through hole aligned at least substantially in the axial direction, wherein the oil retaining ring is attached adjacent to the through hole on the sun shaft in order to direct oil through the through hole to a rolling bearing during operation.

[0034] The planetary gear preferably includes a rolling bearing that supports the sun shaft at least in the radial and / or axial direction. Preferably, the rolling bearing can be designed as a ball roller bearing.

[0035] The design of the rolling bearing advantageously allows for the support and bearing arrangement to accommodate radial and axial forces acting on the bearing during operation of the planetary gear in both directions. Furthermore, the rolling bearing can be adapted to the specific application / design of the planetary gear.

[0036] The invention is explained in more detail below with the aid of a drawing. An embodiment of the oil trap ring according to the invention is shown. It illustrates: Fig. 1 a solar wave with a revelatory oil trap ring in a three-dimensional cross-sectional view, Fig. 2 a solar wave with the revelation-like oil trap ring according to Fig. 1 in a side view, Fig. 3 an oil trap ring according to the invention Fig. 1 in a top view and Fig. 4 an oil trap ring according to the invention Fig. 1 in a top view from an opposite Fig. 4 varied perspectives.

[0037] The figures are purely schematic and serve only to illustrate the invention. The same elements are identified by the same reference numerals. The features of the individual embodiments may be mutually complementary or interchangeable.

[0038] The Fig. Figure 1 shows a solar wave 8 with an oil trap ring 1 according to the invention in a three-dimensional cross-sectional view.

[0039] The oil trap ring 1 for a planetary gear 2 has a ring body 3 in which at least one oil guide hole 4 is provided for guiding oil from one end face 5 of the ring body 3 to another end face 6 of the ring body 3. On one end face 5, at least one oil trap wing 7 is arranged such that, when the oil trap ring 3 rotates during operation, it forces oil through the oil guide hole 4.

[0040] The ring body 3 of the oil trap ring 1 is positioned on a side surface / end face of a sun gear shaft 8. The sun gear shaft 8 is part of a planetary gear set 2. The sun gear shaft 8 has through holes 9. The ring body 3, which serves as the base body of the oil trap ring 1, is arranged in a first axial clearance 10 below a toothed area 11 of the sun gear 8.

[0041] The through-holes 9 are designed as axial extensions of the oil guide holes 4. The oil retaining ring 1 is arranged in a first axial free space 10, thus saving installation space in the axial direction. The oil guide ring 12 is positioned in the second axial free space 13 and preferably projects out of it.

[0042] The Fig. Figure 2 shows a sun wave 8 with the oil trap ring 1 according to the invention. Fig. Figure 1 is shown in a side view. The sun shaft 8, the oil trap ring 1 with its ring body 3 (designed as a closed ring), six oil guide holes 4, and the oil trap wings 7 are shown in detail in a frontal view of the sun shaft 8 and in a side view. One oil trap wing 7 is provided for each oil guide hole 4. The position of the oil trap ring 1 between the toothed area 11 and the sun shaft 8 is clearly visible in the illustrated view. The number of oil guide holes 4 and oil trap wings 7 is variable.

[0043] The Fig. Figure 3 shows the oil trap ring 1 according to Fig. 1 in a top view. The oil trap wings 7 are all curved outwards in an arc, partially surround the oil guide hole 4 and are aligned with the center of the oil trap ring 1 of the sun wave 8, for example, according to Fig. 2, bent over.

[0044] The Fig. Figure 4 shows the oil trap ring 1 according to Fig. 1 in a top view from an opposite Fig. 3 varied perspectives. The oil trap ring 1 is designed as a separate component and is positioned on the front face of the sun wave 8 (not shown), for example, according to Fig. 3. The oil trap ring 1 is preferably connected to the sun shaft 8 by screwing or gluing. Clamping the oil trap ring 1 for precise positioning is also conceivable. Reference symbol list 1 oil trap ring 2 planetary gears 3 ring bodies 4 Oil feed hole 5 One end face 6 Other front 7 oil trap wings 8 Sun wave 9 through hole 12 First axial free space 11 Gear area 12 Oil guide ring 13 Second axial clearance

Claims

Oil trap ring (1) for a planetary gear (2) of a drive train, which has a ring body (3) in which at least one oil guide hole (4) is provided for guiding oil from one end face (5) of the ring body (3) to another end face (6) of the ring body (3), wherein at least one oil trap wing (7) is arranged on one end face (5) such that, when the oil trap ring (3) rotates during operation, it forces oil through the oil guide hole (4). Oil trap ring (1) according to claim 1, characterized in that it has several oil guide holes (4) and several oil trap wings (7). Oil trap ring (1) according to one of claims 1 or 2, characterized in that an oil trap wing (7) is provided for each oil guide hole (4). Oil trap ring (1) according to one of claims 1 to 3, characterized in that one oil trap wing (7) or all oil trap wings (7) are curved outwards in an arc shape. Oil trap ring (1) according to one of claims 1 to 4, characterized in that the oil trap wing (7) surrounds the oil guide hole (4) at least partially. Oil trap ring (1) according to one of claims 1 to 5, characterized in that the oil trap wing (7) is bent towards the center of the oil trap ring (1). Oil trap ring (1) according to one of claims 1 to 6, characterized in that the oil trap ring (1) is designed as a closed ring. Oil trap ring (1) according to one of claims 1 to 7, characterized in that the oil trap ring (1) is designed as a separate part of a sun wave (8) or as an integral part of the sun wave (8). Planetary gear (2) for use in a drive train of a motor vehicle, with a sun shaft (8) having at least one through hole (9) oriented at least substantially in the axial direction, wherein the oil retaining ring (1) according to one of the preceding claims is attached adjacent to the through hole (9) on a sun shaft (8) in order to direct oil through the through hole (9) to a rolling bearing during operation. Planetary gear (2) according to claim 8, comprising a rolling bearing supporting the sun shaft (8) at least in the radial direction.

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