Gearbox arrangement for a vehicle and use of an elastic ring in a gearbox arrangement for a vehicle

Abstract

Gear arrangement for a vehicle, comprising a ring gear (1) with internal teeth (2) and a retaining ring (5) for axially securing the ring gear (1), wherein an elastic ring (11) is radially clamped on the outer diameter in the region of an axial end (4) of the ring gear (1), characterized in that the elastic ring (11) with its outer diameter locks the retaining ring (5) at its inner diameter against radial deflection, wherein the elastic ring (11) is elastically fixed at its inner diameter by at least one snap contact (14) on the outer diameter of the ring gear (1) by positive locking, wherein the elastic ring (11) with several snap contacts (14) distributed around its inner diameter engages positively in a corresponding annular groove (13) on the outer diameter of the ring gear (1), wherein the elastic ring (11) forms at least one projection at its inner diameter as a snap contact (14).wherein the elastic ring (11) for elastic mounting has several elastic segments (17) which each connect two circumferentially arranged fastening sections (18) which form the snap contacts (14) on the inner diameter and the elastic segments (17) are each formed by a spring tab which is integrally connected with the fastening sections (18) at its circumferential ends and forms an axial bulge (24) with a wave-shaped profile in the circumferential direction.

Description

Field of invention

[0001] The invention relates to a transmission arrangement for a vehicle and to the use of an elastic ring in a transmission arrangement for a vehicle according to the type defined in more detail in the preamble of claim 1 or 10.

[0002] Typically, internal gears in transmission systems are axially secured with internal teeth. The problem here is that this securing mechanism can be structurally complex. During operation, the securing device can loosen, particularly due to axial forces or impact forces. This results in axial movement of the internal gear, which can lead to increased wear and losses in the transmission, or even operational malfunctions.

[0003] JP 2016-56938A shows an electromechanical drive device.

[0004] The JP 2014-181 725 A shows a snap-in retaining ring with the reference number 29.

[0005] The JP 2013-181 634 A shows a retaining ring with the reference number 7.

[0006] DE 40 07 941 C1 shows a securing device for a radially slotted shaft retaining ring against centrifugal force-induced widening.

[0007] DE 10 2007 026 415 A1 shows an annular, axial locking element with at least one conical flank, insertable into an annular groove with a conical groove flank and groove base.

[0008] DE 10 2008 000 883 A1 discloses a starting device with a drive bearing shield in which a bearing is mounted, with a drive shaft, wherein the bearing in the bearing shield at least indirectly supports the drive shaft, with a starting pinion which is mounted on the drive shaft in such a way that a torque can be transmitted from the drive shaft to the starting pinion, wherein the starting pinion has an end face and a retaining ring is fixedly arranged on the drive shaft, wherein the starting pinion has a recess on the end face in which a locking element is arranged which prevents an impermissible spreading of the retaining ring.

[0009] DE 25 08 677 A1 shows an axial displacement locking device for a shaft-hub connection using a snap ring. Summary of the invention

[0010] The invention is therefore based on the objective of improving a gear arrangement.

[0011] The problem is solved by the features of claim 1 and claim 5. Further advantageous embodiments are described in the respective dependent claims, the description, and the drawings.

[0012] A transmission arrangement for a vehicle is proposed, comprising a ring gear with internal teeth and a retaining ring for axially securing the ring gear. An elastic ring is radially clamped to the outer diameter in the region of one axial end of the ring gear. Because this ring is positioned such that its outer diameter locks the retaining ring at the inner diameter against radial deflection, the retaining ring's displacement during operation and the ring gear's axial movement are reliably prevented.

[0013] Preferably, the elastic ring is at least partially enclosed radially outside the retaining ring at a radial distance, such that the outer diameter of the elastic ring is spaced from the inner diameter of the retaining ring by a predetermined radial air gap. This easily prevents a retaining ring that is clamped in a housing-side mounting groove from popping out if the aforementioned radial air gap is smaller than the radial engagement depth of the retaining ring in the housing-side mounting groove when clamped.

[0014] The elastic ring is particularly easy to fix elastically on the inner diameter of the hollow gear by means of at least one snap contact through positive locking.

[0015] A positive fit between the elastic ring and the ring gear is achieved in a simple way by providing one or more snap contacts on the inner diameter of the elastic ring, which engage in at least one corresponding recess on the outer diameter of the ring gear.

[0016] The retaining ring engages positively with several snap contacts distributed around the inner diameter into a corresponding ring groove on the outer diameter of the ring gear.

[0017] The elastic ring forms at least one projection on the inner diameter, acting as a snap contact.

[0018] It is further advantageous if the elastic ring is arranged on an annular rim extending from the end of the ring gear, which axially limits an external toothing on the outer diameter of the ring gear towards the end.

[0019] According to the invention, the elastic ring for elastic mounting has several elastic segments, each connecting two fastening sections arranged one behind the other in the circumferential direction, which form the snap contacts on the inner diameter.

[0020] According to the invention, the elastic segments are each formed by a spring tab which is integrally connected to the fastening sections at its circumferential ends and forms an axial bulge with a wave-shaped profile in the circumferential direction.

[0021] The elastic ring is particularly advantageously made of plastic.

[0022] The problem is also solved by using an elastic ring with the properties described above in a transmission arrangement for a vehicle, which has a ring gear with internal teeth and a retaining ring for axially securing the ring gear. The elastic ring is fitted onto the outer diameter of the ring gear in the region of an axial end, such that the retaining ring is secured against radial deflection at the inner diameter.

[0023] The retaining ring can also be designed as a ring-shaped retaining disc with a central bore.

[0024] The transmission arrangement according to the invention can be used in a particularly advantageous way in a vehicle, wherein the transmission arrangement comprises a planetary gear for the electric drive of a driven axle of a vehicle. Brief description of the drawings

[0025] Further features of the invention will become apparent from the following description and from the drawings, in which a simplified embodiment of the invention is shown. The drawings show: Fig. 1 a cutaway view of a transmission arrangement according to the invention for a vehicle, Fig. 2 an enlarged section from Fig. 1, Fig. 3 an enlarged partial view of the gear arrangement, Fig. 4 a single view of an elastic ring of the gear arrangement according to the invention. Detailed description of the drawings

[0026] In Fig. Figure 1 shows an exemplary transmission arrangement according to the invention for a vehicle with a ring gear 1 having internal teeth 2. The ring gear 1 is part of a planetary gear set 3. A retaining ring 5 is arranged in the region of one axial end 4 of the ring gear 1 to secure it axially. Fig. Figure 2 shows an enlarged section at the end 4 of the ring gear 1. The retaining ring 5 engages with its outer diameter in an annular mounting groove 6 on the inner diameter of a housing 7 containing the planetary gear 3, creating a clamping action. Its inner diameter is radially spaced from the outer diameter of the ring gear 1. The ring gear 1 has an annular flange 8 extending axially from its axial end 4 on the outer diameter, axially bounded on the inside by an external tooth 9 projecting from the outer diameter. This external tooth 9 engages with an internal tooth 10 on the inner diameter of the housing 7, preventing rotation.

[0027] An elastic ring 11 is axially mounted on the board 9, starting from end 4. Its end section 12 engages radially inside the retaining ring 5. At the end section 12, the ring 11 and the retaining ring 5 overlap at their outer and inner diameters, respectively. The outer diameter of the ring 11 is spaced from the inner diameter of the retaining ring 5 by a radial air gap S. This radial air gap S is smaller than the radial engagement depth D of the retaining ring 5 in the mounting groove 6 on the inner diameter of the housing 7. In this way, the retaining ring 5 is locked against radial inward deflection at its inner diameter by the outer diameter of the elastic ring 11. This reliably prevents the retaining ring 5 from popping out of the mounting groove 6 due to radial deflection. Thus, the retaining ring 5 is radially secured and, in effect, radially locked by the elastic ring 11.

[0028] To secure the elastic ring 11, an annular groove 13 is provided on the flange 8. When the ring 11 is axially fitted into the groove, it snaps into place with several snap contacts 14 on its inner diameter, creating a positive-locking radial elastic connection. This clamps the ring 11 radially to the outer diameter of the ring gear 1 within the annular groove 13 and secures it positively at both axial end faces.

[0029] On the axial inner side of the retaining ring 5, an annular thrust and spacer washer 15 is arranged coaxially, its outer diameter being centered on the inner diameter of the housing 7. The thrust and spacer washer 15 rests against the retaining ring 5 in an annular fashion on its outer axial side and forms a flat thrust surface 16 on its inner axial side. The ring gear 1, with its external teeth 9 projecting from the outer diameter, can then thrust axially against this thrust surface with a predetermined clearance.

[0030] For assembly, the retaining ring 5 is first mounted in the mounting groove 6 on the housing 7. Then, the elastic ring 11 is elastically pushed onto the outer diameter of the end 4 of the ring gear 1 and clipped into the ring groove 13 with the snap contacts 14. The ring gear 1 can then be easily inserted axially into the housing 7, with its external teeth 9 engaging the internal teeth 10. The subsequently mounted thrust washer 15 and the ring gear 1 are then axially secured by clipping the retaining ring 5 into the mounting groove 6 on the inner diameter of the housing 7.

[0031] Fig. Figure 3 shows a radial top view of a section at the end 4 of the ring gear 1 with the elastic ring 11 mounted on the outer diameter, which is snapped into the annular groove 13 on the flange 8 by means of the snap contacts 14 on the inner diameter. The ring 11 is arranged with its axially inner end slightly spaced axially from the external teeth 9, which are axially limited by the flange 8. The internal teeth 2 are formed on the inner diameter of the ring gear 1.

[0032] According to Fig. 4 The ring 11 has several elastic segments 17 for elastic mounting, of which in Fig. Figure 3 shows only one. The segments 17 are arranged one behind the other in the circumferential direction with several fastening sections 18, the elastic segments 17 each connecting two fastening sections 18 arranged one behind the other. These form snap contacts 14 on the inner diameter, which are designed as cuboid projections, elongated in the circumferential direction and narrow in the axial direction. The snap contacts 14 are arranged in a central region on the inner diameter, extending in the circumferential direction between the axial ends of the ring 11. The elastic segments 17 are each formed by a spring tab, which is significantly reduced in axial width compared to the fastening sections 18. The spring tabs are integrally connected at their circumferential ends to the circumferential ends of the fastening sections 18.They engage with their circumferential ends at an axial edge region of the fastening sections 18 and form a bulge 24 with a wave-shaped profile in the circumferential direction, directed towards the other axial edge region. In the illustrated embodiment, eight fastening sections 18 are provided one behind the other in the circumferential direction, which are connected by eight elastic segments 17, with each fastening section 18 forming a snap contact 14 on its inner diameter.

[0033] The ring gear 1 engages radially inside with the internal teeth 2 with a set of planet gears 19 of the planetary gear set 3, which mesh radially inside with a central sun gear 20 ( Fig.1) This is designed as a single unit with a central shaft 21, which is a hollow shaft with internal teeth at one axial end and can be driven by an electric motor (not shown). A torque transmitted by the electric motor can thus be transferred via the sun gear 20 to the planet gears 19, which are supported on the internal teeth 2 of the ring gear 1, and via a planet carrier 22 supporting these gears to an output pinion 23, which interacts with a differential (not shown) of a driven axle of a vehicle. In this way, a driven axle of a vehicle can be electrically driven via the planetary gear 3. Reference symbol list 1 ring gear 2 Internal teeth 3 planetary gears 4 End 5 retaining ring 6 Mounting groove 7 cases 8 Board 9 External teeth 10 Internal teeth 11 Ring 12 Final section 13 Ring groove 14 Snap contact 15 Thrust and spacer disc 16 approach area 17 segments 18 Fastening section 19 planetary gear 20 sun wheel 21st wave 22 planetary gear carriers 23 output pinion 24 bulge S air gap D Depth of intervention

Claims

[1] Gear arrangement for a vehicle, with a ring gear (1) with an internal toothing (2) and a locking ring (5) for axially securing the position of the ring gear (1), wherein an elastic ring (11) is arranged radially braced on the outer diameter in the region of an axial end (4) of the ring gear (1), characterized bythat the elastic ring (11) with the outer diameter locks the retaining ring (5) on the inner diameter against radial deflection, wherein the elastic ring (11) is elastically fixed on the inner diameter with at least one snap contact (14) by positive locking on the outer diameter of the ring gear (1), wherein the elastic ring (11) with several snap contacts (14) distributed on the inner diameter engages in a positive locking manner in a corresponding annular groove (13) on the outer diameter of the ring gear (1), wherein the elastic ring (11) forms at least one projection as a snap contact (14) on the inner diameter, wherein the elastic ring (11) has several elastic segments (17) for elastic mounting, each of which connects two fastening sections (18) arranged one behind the other in the circumferential direction, which form the snap contacts (14) on the inner diameter and the elastic segments (17) are each formed by a spring tab,which is connected with its circumferential ends in one piece to the fastening sections (18) and forms an axial bulge (24) with a wave-shaped profile in the circumferential direction., [2] Gear arrangement according to claim 1, characterized by that the elastic ring (11) is arranged with the outer diameter spaced from the inner diameter of the retaining ring (5) by a radial air gap (S), wherein the radial air gap (S) is smaller than the radial engagement depth (D) of the retaining ring (5) in a housing-side fastening groove (6) in the clamped state thereof. [3] Gear arrangement according to one of claims 1 or 2, characterized by that the elastic ring (11) is arranged on an annular rim (8) extending from the axial end (4) of the ring gear (1), which axially delimits an external toothing (9) on the outer diameter of the ring gear (1) towards the axial end (4). [4] Gear arrangement according to one of claims 1 to 3, characterized by that the elastic ring (11) is made of plastic. [5] Use of an elastic ring (11) in a transmission arrangement for a vehicle according to claim 1, with a ring gear (1) with an internal toothing (2) and a locking ring (5) for axially securing the position of the ring gear (1), wherein the elastic ring (11) is placed on the outer diameter in the region of the axial end (4) of the ring gear (1) in such a way that the locking ring (5) is secured on the inner diameter against radial deflection.

Images