WO2017162242A1

WO2017162242A1 - Planet drive with at least one planet carrier, planet gears, planet pins and a lubricating device

Info

Publication number: WO2017162242A1
Application number: PCT/DE2017/100237
Authority: WO
Inventors: Hannes Suhr
Original assignee: Schaeffler Technologies AG & Co. KG
Priority date: 2016-03-23
Filing date: 2017-03-23
Publication date: 2017-09-28
Also published as: DE112017001447A5; DE102017106269A1

Abstract

The invention relates to a planet drive (1, 24) having at least one planet carrier (2, 25), planet gears (3, 26, 27), planet pins (4, 28) and at least one lubricating device (5, 30, 43, 44), wherein the planet carrier (2, 25) is rotatable about an axis of rotation (6, 29) and carries at least one of the planet pins (4, 28), and at least one of the planet gears (3, 26, 27) on the planet carrier (3, 26, 27) is rotatably mounted by means of at least one bearing (7, 34) on one of the planet pins (4, 28), the bearing (7, 34) being linked to the lubricating device (5, 30, 43, 44) at least via a lubricant channel (8, 38).

Description

Planet drive with at least one planet carrier, planet wheels,

Planet bolts and with a Schmiervorrichtunq

Field of the invention

The invention relates to a planetary gear with at least one planet carrier, planet gears, planet pins and a lubricating device, wherein the planet carrier is rotatable about an axis of rotation and carries at least one of the planet pins, and wherein in each case at least one planetary gear of the planet gears by means of at least one storage on one of Planet bolt is rotatably mounted, and wherein the bearing is connected to the lubricating device.

Background of the invention

Planetary gears with planetary wheels have at least one central wheel, for example, a sun gear or ring gear, planet pins and planetary gears and a planet on wheel rotations. The planetary gears are rotatably mounted on a planetary pin. For a permanent function or to achieve a long service life of the planetary gear both effective lubrication of Planetenrad- storage is important as the cooling. To lubricate the bearing of the planetary gear lubricating oil flows through an axial lubrication channel in the planet shaft and is directed from there via radial bores to the bearing of the planetary gear. The

Lubricating oil is supplied by the centrifugal force and often with lubricating the storage of planetary gears.

DE 10 2012 223 238 B3 shows a section of a planetary drive with a set of planetary gears. Each planetary gear is meshed with sun gear whose axis of rotation corresponds to the central axis of the planetary drive. All planet gears are each rotatably mounted on a planetary pin, the wheel carrier is used on both sides via a guide sleeve in a planet. The cup-shaped guide sleeve has a central hole in a bottom, the position of which corresponds to a lubricating oil channel of the planetary pin. During operation, oil should laterally enter the lubrication channel via this hole. The KR 2009 005 3444 A discloses a lubricating device for a planetary gear, which has a baffle plate and four circumferentially distributed on the disc axially projecting pins. The pins are located in oil holes of the planet pins and are connected to a catch tray. About the collecting bowl is collected radially oil and partially discharged radially outward again.

In general, such previously described lubricating devices can supply the planetary bearings usually well with lubricating oil. However, there are operating conditions in which there is an additional need for lubricating oil at the bearing points. In these cases, the lubricant supply may be insufficient.

Description of the invention

The object of the invention is to improve the lubricating oil supply.

The object is solved by the features of claim 1. The dependent claims on claim 1, each claim advantageous developments of the invention again.

The object is achieved with a lubricating device which has at least one oil scoop contour oriented in the direction of rotation about the axis of rotation of the planetary drive with at least one opening which is at least partially directed in the direction of rotation. The opening of the Ölschöpfkontur is operatively connected via a Ölleitkontur with the storage. Operatively connected is to be understood that a fluidic connection between the bearing and the lubricating device is formed, can be replaced by the lubricating oil. An embodiment of the invention provides that the lubricating device is connected to the lubricating oil passage.

Compared to previously known solutions, in which the oil is collected either from the radial direction or supplied laterally, allows the invention and aligned with the opening in the direction of rotation of the planetary gear Ölschöpfkontur especially in operating conditions with high speeds, loads and temperatures improved oil absorption. In this case, the opening in the direction of rotation is turned about the axis of rotation of the planetary gear, in which the planet carrier rotates primarily in these operating conditions. Alternatively, oil scoop contours or their openings facing each other in the opposite direction to the lubricating device. The Ölschöpfkonturen are mounted radially on the outside and / or axially laterally. With the Ölschöpfkontur directly oil can be scooped out of an oil bath or it is collected spraying or nebulized oil. The opening is mounted in such a way that oil picked up in the operating state, due to a circumferential force that arises, flows in a direction opposite to the direction of rotation in a Ölleitkontur downstream Ölleitkontur. Subsequently, the oil is passed into the lubricating oil passage before the oil passes through centrifugal force in the bearing of the planetary gear.

The lubricating device with the invention, at least one opening enclosing Ölschöpfkontur is advantageous structurally simple design and inexpensive to produce. This concept can be applied to planetary gears for different applications. Preferably, the lubricating device constructed according to the invention is suitable for use in transfer cases, e.g. Helical gear differentials, planetary gears in automatic transmissions or in planetary gear sets and differentials of transmissions of electrically operated vehicles.

According to a preferred embodiment of the invention it is provided that the lubricating device has the Ölschöpfkontur and an open in the direction of the axis of rotation of the Planetenradträgers oil catching contour. About the oil trap contour can be taken radially rotating oil from the inside or centrifugal force on the planet carrier radially outward flowing oil at a rotating planetary gear. The oil scoop outlines and the oil scavenging contour are brought together before or at the oil guide contour. During operation, the radial oil flow is absorbed by the oil trap contour and the oil taken up by the oil scoop contour that is open in the direction of rotation of the planetary drive flows counter to the direction of rotation of the planetary drive to the oil guide contour. A circumferential oil flow causes in the circumferentially directed portion of the Ölleitkontur entrainment or a deflection of centrifugal oil flow. Consequently, the entire oil flow accelerates over the Ölleitkontur in the lubricating oil passage of the planetary bolt.

The Ölfangkontur is preferably a groove, which is also part of the Ölleitstruktur. The lubricating device advantageously has an oil collecting tray, which is associated with the oil scoop contour, the oil scavenging contour and the oil guide contour. The preferably encircling and designed as a gutter oil trap is optionally provided with a side wall. Furthermore, the Ölfangschale the Ölleitkontur is assigned, which ensures a deflection and forwarding of the oil in the respective lubricating oil passage of the planetary bolt.

An advantageous embodiment of the invention provides that the oil scoop contour is arranged on the outer circumference of the oil collecting tray. The opening is preferably formed on a radially emerging from the oil catch pan, rounded, over a width of the oil pan extending scoop whose height is continuously reduced from the opening against the direction of rotation. The number of Hutzen and thus the openings preferably corresponds to the number of lubrication channels in planetary pins of the planetary drive. For receiving a large volume of oil, it is advisable to provide between two adjacent lubrication channels, for example, two openings formed at Hutzen. The number of lubrication channels corresponds to the number of planetary pins of the planetary drive or is alternatively also lower. Alternatively, it is also conceivable that some planetary bolts of the planetary drive are supplied with the lubricating device and others are not.

The oil collecting tray is composed of one or more parts of at least two individual segments and has oriented in different directions or directionally oriented Ölschöpfkonturen and a Ölleitkontur on. The separate segments are preferably directly or alternatively indirectly each associated with a planetary pin. Alternatively, a sleeve which is fitted in the planet carrier and which is intended to receive the planet pin can take on the function of the lubricating device with associated oil-skimming contour. The lubricating device is can be produced without cutting from sheet metal, for example with a deep-drawing process as a sleeve or channel-shaped oil collecting tray. Their shape is introduced by means of cutting, punching and / or bending and embossing in the bottom of the sleeve or in a board of the sleeve or the channel. Starting from the incision, a forwardly inclined, in the circumferential direction continuously tapering on-board or bottom section adjoins the axis of rotation of the planetary drive open forms a further Ölschöpfkontur forms, at the end of an Ölleitkontur. Alternatively, made of a plastic material, in particular by means of injection molded oil trays are used.

This embodiment of the lubricating device is particularly advantageous if the Ölschöpfkontur (s), Ifin contour (s) and the Ölleitkontur (s) are formed together on the already described trough-shaped oil collecting tray. The production of such plastic components is inexpensive. In addition, relatively simple structures can be realized on plastic parts.

According to a further embodiment of the invention, the lubricating device has a designed as a separate component oil trap. For this purpose, a one-piece and channel-like oil catcher is preferably provided, which is preferably fastened to the planetary wheel carrier. The oil scoop outlines of the oil trays, pointing in different or main directions of rotation, protrude radially or axially and the oil trapping contour, e.g. the channel is formed on the side facing away from the planet carrier. Associated Ölleitkonturen the oil pan or the channel itself connect the

Ölschöpfkontur with the lubricating oil channels of the planet pins.

The oil collecting tray can be fastened, for example, to a component of the planetary drive via non-positively and / or positively locking means. For this purpose, the oil collecting tray, for example, holding clips which are engaged in associated receptacles of the planet carrier. Alternatively, it offers standing, for example, individual segments or the entire oil catcher frictionally by means of a clamping connection to the planetary wheel carrier or the planetary bolt to attach, for example with the Axialscheiben of thrust bearings. The Ölfangschale looks as Ölleitkontur at the same time or alternatively edges, bottoms and a groove, as well as axially projecting, hollow cylindrical or in the direction of the axis of rotation of the planetary gear carrier channel-shaped open-shaped pin. In the installation state of the lubricating device, each pin engages in an associated one

Lubricating oil channel of planetary bolt. This structure ensures optimum oil supply of the planetary gear. Alternatively, the pins, if the lubrication channel is formed in a planet carrier or begins there, sitting in the planet carrier.

Description of the drawings

The invention will be explained in more detail with reference to embodiments.

1 shows a partial section through an embodiment of a planetary drive, along the axis of rotation of the planet carrier,

FIG. 2 shows a front view of an embodiment of the lubricating device used in the planetary drive shown in FIG. 1, FIG.

3 shows the lubricating device of Figure 2 in a side view,

Fig. 4: a partial section through an embodiment of a wheel differential as a front planetary gear, and

Fig. 5: the oil trap according to FIG. 4 in a side view.

Figure 1 shows a planetary drive 1 with a planet carrier 2, planet wheels 3, planet bolts 4 and with a lubricating device 5. The planet carrier 2 is rotatable about a rotation axis 6 and carries the planet pins 4. Each a Pianetenrad 3 is with a bearing 7 on one of the planetary bolts 4 rotatably mounted. Of the planetary gears 3 and the planetary pin 4 is shown in the illustration of Figure 1 only one pictorially. The planet gears 3 are in meshing engagement with a ring gear 23. The bearing 7 is in this case a sliding bearing and may alternatively be designed as a (not shown) rolling bearing. The respective planet bolt 4 is hollow. The located in the planetary pin 4 axial bore is also a

Lubrication channel 8. From the lubrication channel 8 lead from transverse bores 9 to the bearing 7. The bearing 7 is fluidly connected via the lubrication channel 8 with the lubricating device 5.

The lubricating device 5 has an oil collecting tray 10. The oil collecting tray 10 is formed by a side wall 11, a Ölschöpfkontur 12 and an oil trap contour 13. The Ölschöpfkontur 12 has a direction of rotation about an axis of rotation 6 of the planetary drive 1 facing opening 14 and a Ölleitkontur 15 (Fig. 2). The Ölleit- contour 15 extends from the opening 14 on the inside of the hood-like Ölschöpfkontur 12. The ölfangkontur 13 is formed by a radially to the axis of rotation 6 and open towards the axis of rotation 6 extending groove 16, which to one side through the side wall eleventh and is limited to the other side by a side edge 19 and which is at the same time a Ölleitkontur 17. The oil catching contour 13 and the oil-guiding contour 17 are brought together in the channel 16. The Ölleitkontur 17 leads to axially projecting hollow cylindrical pin 18, of which each one inserted in one of the lubrication channels 8 and has a passage 20, so that the Ölschöpfkontur 12 is connected via the Ölleitkonturen 15 and 17 and the passage 20 with the lubricating oil passage 8.

The oil collecting tray 10 is shown in Figures 2 and 3 as a single part. The side wall 1 1 joins the groove 16 radially outward with polygonal course, which is formed in the view of Figure 2 by the side edge 19 hidden between the side edge 19 and the side wall 1 1 Mr. In the "corners" of the polygon, the passages 20 of the three pins 18 of the oil-collecting tray 10, which are alternatively also provided with surge brakes 51, are provided with the channel 16. The channel 16 has three at the outer circumference

Oil scoop contours 12, which protrude radially beyond the outer circumference of the groove 16 and which are provided in the marked with the arrow 21 rotation about the axis of rotation 6 facing openings 14. The as a radial distance from the outer edge the groove 16 measured height H1, H2, H3 to HN of Ölschöpfkonturen, and thus the distance of the respective Ölleitkontur 15 to the axis of rotation 6, starting from the respective opening 14, starting from the direction of rotation continuously reduced. The number of openings 14 and thus the number of Ölschöpfkonturen 12 correspond to the number of lubricating oil channels 8 and thus the number of planet pins 4. On the side wall 19 clips 22 are formed with which the oil pan 0 can be attached to the planet carrier 2.

Figure 4 shows a raddifferenzial as a front end planetary gear 24 with a planet carrier 25, planet gears 26 and 27, planet pins 28, sun gears 31 and 32, with a drive wheel 37 and with lubricating devices 30. The planet carrier 25 is the differential cage of the front wheel differential and about an axis of rotation 29 rotatably mounted rotatably in a housing, not shown. The planetary gears 26 form a first planetary gear set, which is at the same time a first set of differential gears of the front wheel differential. The planet gears 27 form a second planetary gear set, which is at the same time a second set of differential gears of the spur gear differential. In the illustration of Figure 4, only one planetary gear 26 is shown visible. A planetary gear 27 is hidden in the illustration by the planetary gear 26 and indicated only by a dashed line. Each of the planetary gears 26 and 27 is seated on a separate planetary pin 28. The planet gears 26 and 27 have the same number of teeth but different distances of their axes of rotation 33 to the axis of rotation 29. The Piane- tenräder 26 and 27 are formed with plain bearings 34 mounted around the axes of rotation 33 rotatably on the respective planet bolts 28. The planet pins 28 sit firmly in the planet carrier 25 and thereby received with their ends in sleeves 39.

The planetary gears 26 are axially about twice as wider than the planetary gears 27. The planet gears 26 are in meshing engagement with the sun gear 32 and the planet gears 27 with the sun gear 31. Each planet gear 26 is axially in height with the teeth of the sun gear 31 with a planetary gear 27 in meshing engagement. The planet gears 26 axially overlap also the sun gear 31, although they are not in mesh with this. Other axial distances of their axes of rotation 33 to the axis of rotation 29 than that of the planet gears 27 and profile displacements of the otherwise same teeth of the planet gears 26 and 27 and sun gears 31 and 32nd prevent that with the sun gear 32 in meshing planetary gears 26 collide with the teeth of the sun gear 31.

The profile shift of the gears results in that the planetary gears of one planetary gear set have longer teeth than the planetary gears of the other planetary gearset and that the planetary gears with the longer teeth in meshing with short teeth of a sun gear and the planetary gears with the shorter teeth with long teeth of the other sun gear meshing with each other, wherein the short teeth of one sun gear are shorter than the long teeth of the other sun gear.

Each of the planet gears 26 and 27 is mounted with a bearing 34 on one of the planet pins 28. Each of the planet pins 28 is hollow cylindrical and therefore has a through hole 35. Radially transverse bores 36 lead from the through-hole 35 to the respective mounting 34. The through-hole 35 is a lubrication channel 38, which is fluidically connected to one of the lubricating devices 30 on both sides.

The respective lubricating device 30 is formed integrally with the bottom 40 of the sleeve 39. The respective lubricating device 30 has at least one oil scoop contour

41 with at least one in a direction of rotation about the axis of rotation 29 or in the opposite direction of rotation about the axis of rotation facing Ölschöpfkontur

42 on. The Ölschöpfkontur 41 formed in the left image of the planetary pin 28 is open from the left in the direction of rotation about the axis of rotation 29 in the clockwise direction and the right side Ölschöpfkontur 42 from the same direction in the direction of rotation counterclockwise open. Both oil scoop contours 41 and 42 are in each case via an oil guide contour 51 formed on the respective bottom 40 with the lubricating kana! 38 connected. As a result, the planetary drive 24 has a number of lubrication devices 30 corresponding to twice the number of lubrication channels 38.

FIGS. 5 and 6 each show an exemplary embodiment of a lubricating device

43 and 44, respectively. The lubricating devices 43 and 44 of the sleeves 52 and 53 differ in their number of oil scoop contours 45 (three for the lubricating contours 45). device 43 and two for the lubricating device 44) wherein the oil scoop contours 45 are formed from the bottom 46 and cut-through tabs 47 and 48 formed on one side between the edge of the hole 49 at the bottom 46 an opening 50 between the bottom 46 and the respective tabs 47 and 48 limit and thus form the Ölschöpfkonturen 45.

reference numeral

Planet drive 31 sun gear

Planet carrier 32 suns rad

Planetary gear 33 rotation axis

Planet pins 34 storage

Lubricator 35 passage hole

Rotation axis 36 transverse bore

Storage 37 Drive wheel

Lubrication channel 38 lubrication channel

Transverse bore 39 sleeve

Oil catcher 40 soil

Sidewall 41 Oil scoop contour

Ölschöpfkontur 42 Ölschöpfkontur

Oil trap contour 43 Lubricator

Opening 44 lubricating device

Oil guide contour 45 Oil scoop contour

Channel 46 ground

Oil guide 47 Flaps

Spigot 48 lobes

Sides edge 49 holes

Passage 50 opening

Arrow 51 Oil guide contour

Clip 52 sleeve

Ring gear 53 sleeve

planetary drive planet carrier

planet

planet shaft

axis of rotation

lubricator

Claims

claims

1 . Planet drive (1, 24) with at least one planet carrier (2, 25) planet wheels (3, 26, 27), planet pins (4, 28) and with at least one lubricating device (5, 30, 43, 44), wherein the planet carrier (2 , 25) about a rotational axis (6, 29) is rotatable and at least one of the planet pins (4, 28) carries, and wherein in each case at least one planet (3, 26, 27) of the planet wheels (3, 26, 27) by means of at least one Bearing (7, 34) is rotatably mounted on one of the Piane- tenbolzen (4, 28), and wherein the bearing (7, 34) at least with the lubricating device (5, 30, 43, 44), is connected, characterized in that the lubricating device (5, 30, 43, 44) has at least one oil scoop contour (12, 41, 42, 45) with at least one opening (14, 50) turned in the direction of rotation about the axis of rotation (6, 29) of the planetary drive (1) and one has at least one Olleitkontur (15, 17, 51), wherein the Ölschöpfkontur on the Ölleitkontur (15, 17, 51) with the storage (7, 34) is effective connected is.

2. Planet drive according to claim 1, characterized in that the bearing (7, 47) via a lubrication channel (8, 38) is connected to the lubricating device, wherein the Öischöpfkontur via at least one of the ölleitkonturen (15, 17, 51) with at least one formed in the planet pins (4, 28)

Lubricating oil channel (8, 38) is connected.

3. planetary drive according to claim 1, characterized in that the lubricating device (5) further comprises in the direction of the axis of rotation (6) open Ölfangkontur (13), wherein the Ölschöpfkontur (12) and the Ölfangkontur (13) merge into one another.

4. planetary gear according to claim 3, characterized in that the Ölleitkontur (17) is a the Ölfangkontur (13) and the Ölschöpfkonturen (12) unifying groove.

Planet drive according to claim 4, characterized in that at least one Ölleitkontur (15, 17) of the Ölleitkonturen (15, 17) in axially projecting hollow or channel-shaped pin (18) leads, wherein the pins (18) to the channel (16) connect and in a at least in one of the planet pins (4) formed Schmie röikanal (8) at least one planet bolt Ns (4) engage.

Planetary drive according to claim 4, characterized in that the channel (16) on the outer circumference of the Ölschöpfkonturen (12) which project radially beyond the outer periphery of the groove (16) and with at least one in a rotational direction of the Planetenradträgers (2) about the axis of rotation (6) facing openings (14) are provided, wherein the height (H1, H2, H3, HN) of the Ölschöpfkonturen (12) from the respective opening (14) against the direction of rotation of the Planetenradträgers (2) continuously reduced.

Planet drive according to claim 2, characterized in that the number of openings (14) at least with the number of lubricating oil channels (8) coincides.

Planet drive according to claim 1, characterized in that the planetary drive (24) at least two of the lubricating devices (30, 43, 44)).

Planet drive according to claim 8, characterized in that the planetary drive (24) has at least one of the number of lubricating oil channels (38) corresponding number of lubricating devices (30, 43, 44).

10. planetary gear according to claim 1 or 8, characterized in that the planet pins (28) end in a sleeve (39, 52, 53) which a bottom (40, 46) sits, wherein the bottom (40, 46) the lubricating oil passage (38) at least partially covered and that the oil scoop contour (41, 42, 45) on the sleeve (39, 52, 53) is formed and wherein at least a portion of the bottom (40, 46) and / or the

Sleeve (39, 52, 53) has the Ölleitkontur (51).

11. Planetary drive according to claim 1, comprising a first set of planetary gears (26) and a second set of planetary gears (27), with a planet carrier (25) and planetary bolts (28 and with two sun gears (31, 32), wherein each of the planet gears (26, 27) is seated on another planetary pin (28) and the respective planetary pin (28) is supported by the planetary carrier (25), and wherein the planetary gears (26) of the first set are provided with a sun gear (32) of the sun gears (31, 32) and the planet gears (27) of the second planetary gear set with a further sun gear (31) of the sun gears (31, 32) in the Zahneinghff and wherein the bearing (34) at least one of the planet gears (26, 27) with the lubricating device ( 30, 43, 44) is operatively connected.