Device with a Decoupled Cylinder Sleeve

Abstract

A device includes a cylinder sleeve (3, 13), which is at least indirectly arranged at a housing (7) and at least three radially outward extending journals (5). Each journal (5) comes to rest, at least on one side, against a roller element (6a, 6b) accommodated at the housing (7) in order to support the cylinder sleeve (3, 13) on the housing (7) in at least one tangential direction. The device can be designed, in particular, as a planetary transmission or as an electric machine.

Claims

1-10. canceled

11. A device, comprising: a housing (7); a cylinder sleeve (3, 13) at least indirectly arranged at the housing (7), the cylinder sleeve (3, 13) comprising at least three radially outward extending journals (5), each journal (5) arranged between a respective pair of cylindrical roller elements (6a, 6b) accommodated at the housing (7) in order to support the cylinder sleeve (3, 13) on the housing (7) in a tangential direction, each journal (5) displaceable in a radial direction relative to the housing (7) by rolling on the respective pair of cylindrical roller elements (6a, 6b).

12. The device of claim 11, wherein the journals (5) are uniformly distributed on an outer circumferential surface of the cylinder sleeve (3, 13).

13. The device of claim 11, wherein there is linear contact between the journals (5) and the respective pair of cylindrical roller elements (6a, 6b).

14. The device of claim 11, wherein the journals (5) are press-fit into recesses on the cylinder sleeve (3, 13).

15. The device of claim 11, wherein the journals (5) are integrally bonded with the cylinder sleeve (3, 13).

16. The device of claim 11, wherein the journals (5) and the respective pair of cylindrical roller elements (6a, 6b) are arranged in an axial direction at least indirectly between a shoulder (8) of the housing (7) and a securing ring (9).

17. The device of claim 16, wherein a thrust washer (10) is arranged between the securing ring (9) and the journals (5).

18. The device of claim 11, wherein at least a portion of the roller elements (6a, 6b) have unequal diameters.

19. The device of claim 11, wherein: the device is configured as a planetary transmission (1) that comprises a sun gear (2), a ring gear (3), and a plurality of planet gears (4); the journals (5) extend radially outward starting from the ring gear (3); and each journal (5) is arranged between the respective pair of cylindrical roller elements (6a, 6b) accommodated at the housing (7) in order to support the ring gear (3) on the housing (7) in the tangential direction.

20. The device of claim 11, wherein: the device is configured as an electric machine (12) that comprises a stator (13) and a rotor (11), the rotor (11) rotationally drivable relative to the stator (13); the journals (5) extend radially outward starting from the stator (13); and each journal (5) is arranged between the respective pair of cylindrical roller elements (6a, 6b) accommodated at the housing (7) in order to support the stator (13) on the housing (7) in the tangential direction.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Example embodiments of the invention are explained in greater detail in the following with reference to the drawings, wherein identical or similar elements are provided with the same reference characters, wherein

[0019] FIG. 1 shows a highly diagrammatic cross-sectional representation of a planetary transmission according to a first example embodiment,

[0020] FIG. 2 shows a highly diagrammatic longitudinal sectional representation of the planetary transmission according to FIG. 1,

[0021] FIG. 3 shows a highly diagrammatic cross-sectional representation of an electric machine according to a second example embodiment, and

[0022] FIG. 4 shows a highly diagrammatic longitudinal sectional representation of the electric machine according to FIG. 3.

DETAILED DESCRIPTION

[0023] Reference will now be made to embodiments of the invention, one or more examples of which are shown in the drawings. Each embodiment is provided by way of explanation of the invention, and not as a limitation of the invention. For example, features illustrated or described as part of one embodiment can be combined with another embodiment to yield still another embodiment. It is intended that the present invention include these and other modifications and variations to the embodiments described herein.

[0024] According to FIG. 1 and FIG. 2, a device designed as a planetary transmission 1 is shown in a highly diagrammatic way according to a first example embodiment. The exemplary planetary transmission 1 includes a sun gear 2, a cylinder sleeve-shaped ring gear 3 having an internal toothing, as well as a planetary gear set having multiple planet gears 4, which are rotatably mounted at least indirectly on a planet carrier (not represented here). In FIG. 2, a representation of the planet gears 4 and of the sun gear 2 is dispensed with for the sake of simplicity.

[0025] Four radially outward extending journals 5 are arranged uniformly distributed on an outer circumferential surface 16 of the ring gear 3. In the present case, two journals 5 are arranged essentially horizontally opposite each other on the ring gear 3 and two further journals 5 are arranged essentially vertically opposite each other on the ring gear 3, wherein the journals 5 extend over nearly the entire axial length of the ring gear 3, as is apparent in FIG. 2.

[0026] The journals 5 extend radially into a particular recess 14 on the housing 7 and are arranged between two particular roller elements 6a, 6b, which are arranged in the particular recess 14 and enable a tangential support of the ring gear 3 on the housing 7. Consequently, a torque acting on the ring gear 3 can be supported tangentially on the housing 7 via the journals 5 and, depending on the direction of the torque, via the particular roller element 6a, 6b. Simultaneously, each journal 5 is movable in the radial direction in relation to the housing 7, wherein the particular journal 5 can roll on the particular roller element 6a or 6b depending on the load and depending on the radial deflection of the ring gear 3. In other words, the journals 5 do not come to rest against the housing 7 in the radial direction. The journals 5 also rest against the roller elements 6a, 6b only as a function of an applied torque such that a non-permanent contacting between the journals 5 and the associated roller elements 6a, 6b and, consequently, an acoustic decoupling of the ring gear 3 from the housing 7 are implemented.

[0027] The roller elements 6a, 6b are designed to be cylindrical and their axial length corresponds essentially to the axial length of the journals 5. In particular, the roller elements 6a, 6b and the journals 5 are designed to be equally long. Consequently, there is linear contact between the journals 5 and the particular roller elements 6a, 6b. The roller elements 6a, 6b can therefore come to rest against the recess 14 of the housing 7 as well as against the journal 5.

[0028] Moreover, the journals 5 are press-fit into recesses—which is not shown in greater detail here—on the ring gear 3 such that a manufacture of the journals 5 and of the ring gear 3 can be carried out in a simplified and, therefore, more cost-effective manner. Alternatively, it is conceivable to integrally join the journals 5, for example, via welding, with the ring gear 3.

[0029] The journals 5 as well as the roller elements 6a, 6b are also axially tensioned in the housing 7 and, in fact, the journals 5 as well as the roller elements 6a, 6b come to rest, on the one hand, axially against a shoulder 8 of the housing 7, which is integrally connected to the housing 7, and, on the other hand, against a thrust washer 10. The thrust washer 10 is secured in its axial position by a securing ring 9 designed as a snap ring, which is accommodated in a circumferential groove 15 on the housing 7.

[0030] Roller elements 6a, 6b having different roller diameters can be utilized in order to compensate for manufacturing tolerances and adapt the positioning of the ring gear 3 in the space. Consequently, at least a portion of the roller elements 6a, 6b have unequal outer diameters such that, as a result, a play-free system is achieved.

[0031] As is highly diagrammatically represented in the second exemplary embodiment according to FIG. 3 and FIG. 4, the acoustic decoupling can also be provided in an electric machine 12. In other words, the device is designed as an electric machine 12 and includes a stator 13 and a partially represented rotor 11, which is rotationally drivable in relation to the stator 13. The only difference from the preceding embodiment is that the journals 5 are arranged on an outer circumferential surface 16 of the stator 13 and extend radially outward starting therefrom and, in so doing, are arranged between two roller elements 6a, 6b in order to tangentially support the stator 13. The mode of operation for the vibration decoupling takes place similarly to the comments presented with respect to the planetary transmission 1 according to FIG. 1 and FIG. 2.

[0032] Modifications and variations can be made to the embodiments illustrated or described herein without departing from the scope and spirit of the invention as set forth in the appended claims. In the claims, reference characters corresponding to elements recited in the detailed description and the drawings may be recited. Such reference characters are enclosed within parentheses and are provided as an aid for reference to example embodiments described in the detailed description and the drawings. Such reference characters are provided for convenience only and have no effect on the scope of the claims. In particular, such reference characters are not intended to limit the claims to the particular example embodiments described in the detailed description and the drawings.

[0033] Reference characters [0034] 1 planetary transmission [0035] 2 sun gear [0036] 3 ring gear [0037] 4 planet gear [0038] 5 journal [0039] 6a first roller element [0040] 6b second roller element [0041] 7 housing [0042] 8 shoulder [0043] 9 securing ring [0044] 10 thrust washer [0045] 11 rotor [0046] 12 electric machine [0047] 13 stator [0048] 14 recess on the housing [0049] 15 groove [0050] 16 outer circumferential surface