Rotary actuator for roll stabilization of a motor vehicle

Abstract

Rotary actuator (1) for roll stabilization of a motor vehicle, wherein the rotary actuator (1) comprises: a housing (2), a gearbox received in the housing (2) with a gearbox output shaft (3) which is supported against the housing (2) by a bearing (4), wherein the bearing (4) is secured in the axial direction by a locking device (5), characterized in that the locking device (5) comprises a first retaining ring (7) attached or attachable to a housing-side receiving area (6) and a further retaining ring (9) attached or attachable to a gearbox output shaft-side receiving area (8), wherein the first and the second retaining ring (7, 9) each comprise a tool engagement section (10, 11) for the temporary engagement of a tool, wherein the tool engagement sections (10, 11) of the first and the further retaining ring (7, 9) are arranged axially offset from each other.

Description

[0001] The invention relates to a rotary actuator for roll stabilization of a motor vehicle.

[0002] Rotary actuators for roll stabilization of a motor vehicle, also called swivel motors, are known in principle from the prior art. Reference is made in this context to DE 10 2015 220 176 A1, DE 10 2017 209 686 A1, DE 10 2014 202 829 A1, DE 10 2017 211 579 A1, and the subsequently published DE 102019 103 875 A1. Furthermore, DE 10 2014 205 261 A1, for example, shows a rotary actuator that is arranged in the motor vehicle between two stabilizer halves. This rotary actuator comprises a housing, an electric motor, and a gearbox. The gearbox is provided with a gearbox input shaft and is connected to the gearbox in a torque-transmitting manner. The gearbox also features a gearbox output shaft, which is in torque-transmitting connection with one stabilizer half. The gearbox itself serves to reduce the speed of the electric motor. The gearbox output shaft, which can be used, for example, as a planet carrier or...The rotating carrier, which can be designed as a planet carrier, is supported against the housing by a bearing assembly. The bearing assembly has an inner ring and an outer ring, with the inner ring of the bearing secured to the planet carrier by a bearing nut and the outer ring of the bearing secured to the housing by a retaining ring. For this purpose, the housing has an annular groove into which a retaining ring designed as a snap ring is inserted. The connection of the snap ring in the annular groove can only absorb limited axial forces and / or can lead to loosening of the snap ring-annular groove connection under certain vibration patterns / resonances. The minimum height of the usually cylindrical rotary actuator is also limited, since tools for positioning and / or fixing or for mounting the snap ring and the bearing nut must be inserted into the space between the inner wall of the housing and the planet carrier.must be defined as movable relative to the housing and / or relative to the planet carrier.

[0003] The invention is based on the objective of providing a rotary actuator which, in particular with regard to a simple, quick and cost-effective measure, enables a high load-bearing capacity of the rotary actuator and at the same time enables a compact design, in particular a low height (e.g. small outer diameter) of the rotary actuator.

[0004] The problem is solved by a rotary actuator for roll stabilization of a motor vehicle according to claim 1, by a roll stabilizer according to claim 13, and by a method for mounting a rotary actuator according to claim 14. The dependent claims relate to possible embodiments of the rotary actuator.

[0005] The invention relates to a rotary actuator for roll stabilization of a motor vehicle, wherein the rotary actuator comprises: a housing, a gearbox received in the housing with a gearbox output shaft which is supported against the housing by a bearing, the bearing being secured axially by a locking device. The rotary actuator is characterized in that the locking device comprises a first retaining ring attached or attachable to a receiving area on the housing side and a further retaining ring attached or attachable to a receiving area on the gearbox output shaft side, wherein the first and the second retaining ring each comprise a tool engagement section for the temporary engagement of a tool, wherein the tool engagement sections of the first and the further retaining ring are arranged axially offset from one another.The first retaining ring secures a bearing component, in particular an outer bearing ring, relative to the housing. A further component of the bearing, in particular an inner bearing ring, can be secured at least axially by the second retaining ring, which is or can be arranged on the transmission output shaft. This enables the retaining device, consisting of two retaining rings, to secure the bearing axially relative to both the housing and the transmission output shaft.

[0006] By temporarily engaging a tool with the tool engagement sections of the retaining rings, a controlled relative movement of at least one retaining ring with the housing or the transmission output shaft can be achieved, thus securing the retaining rings in place. For this purpose, the retaining rings form a force-fit and / or positive-locking connection with the receiving areas of the housing or the transmission output shaft. For example, a controlled movement of the tool in the engaged state with the tool engagement section of a retaining ring, or the relative movement of the retaining ring to the housing and / or transmission output shaft, can include a rotary movement, in particular one coaxial with the central longitudinal axis of the rotary actuator and / or the housing and / or the transmission output shaft.For example, it is possible that, starting from the relative movement introduced by the tool, the retaining rings are screwed onto a receiving area of ​​the housing and / or the transmission output shaft that has a corresponding thread via threaded areas on the retaining ring side.

[0007] Because the tool engagement sections of the first and subsequent retaining rings are axially offset from each other, a smaller and more compact design for the rotary actuator is possible. For mounting the retaining rings and for tools to engage with them, an annular gap or space formed by the inner surface of the housing and the outer surface of the transmission output shaft is available. The width of this annular gap provides sufficient clearance for feeding the retaining rings and for inserting and moving the tool used to secure them.

[0008] In a first step, a retaining ring is positioned and fixed to the housing or the transmission output shaft, in particular by threading and tightening (threaded design). This reduces the available annular gap in the plane of the annular gap in which the first retaining ring is located.In a second step, the additional retaining ring is inserted, at least partially, into the reduced annular gap. The tool engagement section of the additional retaining ring extends within the annular gap in the direction away from the bearing, such that sufficient space is available to engage a tool with the tool engagement area of ​​the additional retaining ring. This space is not reduced or constricted by the first retaining ring to such an extent that the tool could no longer engage the tool engagement area of ​​the second retaining ring. In other words, the tool used to secure the additional retaining ring can be inserted, at least partially, into the annular gap between the first retaining ring and the transmission output shaft and / or the transmission output shaft.the further retaining ring arranged there and contact the further retaining ring, in particular radially, in such a way that a torque-transmitting connection can be established or is established.

[0009] A section of the second retaining ring, particularly one without a tool engagement section, extends into the narrowed annular gap in the plane of the tool engagement section of the first retaining ring. In the final assembly state, this section of the second retaining ring extends over, and in particular over, the entire axial length of the first ring body. In other words, the second retaining ring can be in contact with the bearing or with a component of the bearing in the final assembly state. Preferably, both retaining rings are in contact with the bearing in the final assembly state, and in particular with different components of the bearing. For example, the bearing has an inner and an outer bearing ring, with a first retaining ring in contact with an outer bearing ring and a second retaining ring in contact with an inner bearing ring.

[0010] Since no first retaining ring is arranged in the plane (perpendicular to the main extension axis of the rotary actuator) of the tool engagement section of the further retaining ring, at least partially, and in particular completely, the available annular gap-like space is sufficient for introducing and engaging a tool with the tool engagement section of the further retaining ring, despite a possibly compact design or a small outer diameter of the rotary actuator.

[0011] The transmission output shaft can, for example, be a component of a transmission designed as a planetary or epicyclic transmission, whereby the transmission output shaft can particularly preferably form a planetary or epicyclic carrier.

[0012] The bearing can be designed, for example, as a rolling bearing or as a sliding bearing, with a first bearing component (e.g. outer bearing ring) being attached to the housing side and another bearing component (e.g. inner bearing ring) being attached to the gearbox output shaft side.

[0013] It is possible that the tool engagement sections of the first and the second retaining ring are arranged in a non-intersecting axial position in the final assembly state. In other words, the tool engagement sections can be arranged in different planes extending radially from the main axis of extension of the rotary actuator or perpendicular to the main axis of extension of the rotary actuator, and these planes do not overlap. This allows for maximum clearance for feeding and moving a tool to be applied to a tool engagement section of the second retaining ring, particularly one located on the circumferential or cylindrical surface.The tool engagement section of the first and / or subsequent retaining ring is designed, for example, such that it can apply a torque, in particular a tightening torque, of 150 to 600 Nm, preferably 250 to 450 Nm, and particularly preferably 200 to 400 Nm, when engaged with the tool. The tool can have a wall thickness of 0.5 to 3 mm, preferably 1 to 1.5 mm, in the tool attachment that contacts or surrounds the tool engagement section on the retaining ring side.

[0014] At least in the final assembly state, the housing-side receiving area and the transmission output shaft-side receiving area can, for example, be arranged to overlap axially, and in particular to be axially aligned. This allows an identical transmission output shaft to be used for both a rotary actuator with a compact design (i.e., small outer diameter) and a rotary actuator with a larger design (i.e., a larger outer diameter). In the case of the larger rotary actuator, the tool engagement sections of the retaining rings can, for example, lie in a common plane, since, due to the larger design, even if both tool engagement sections of the retaining rings are in a common plane, the space between them can be sufficiently large for the insertion and intended action of a tool. The overlap orThe overlap of the housing-side receiving area and the transmission output shaft-side receiving area can be at least 10%, preferably at least 50%, particularly preferably at least 75%, most preferably at least 90% of the axial extent of the smaller or shorter retaining ring and / or the receiving area accommodating the smaller or shorter retaining ring, especially in the final assembly state.

[0015] Alternatively or additionally, it may be provided, for example, that the housing-side receiving area and the transmission output shaft-side receiving area are arranged or formed in axially different sections, or at least partially, and in particular completely, do not lie in a common plane extending perpendicular to the main axis of extension of the rotary actuator. In this case, it may be advantageous, for example, if the tool engagement section and the contact section of the first retaining ring are arranged or formed in a common plane, and the tool engagement section and the contact section of the second retaining ring are arranged or formed in a common plane. These two common planes are arranged or formed axially offset from each other.For example, a bridging section of a retaining ring can bridge or penetrate an annular gap between the other retaining ring and the housing and / or the transmission output shaft in such a way that the retaining ring with the bridging section makes contact with the bearing.

[0016] It is possible that the first retaining ring comprises a contact section via which the first retaining ring is connected or connectable to the receiving area on the housing side, and that the second retaining ring comprises a contact section via which the second retaining ring is connected or connectable to the receiving area on the transmission output shaft side, wherein, at least in the final assembly state, the contact section of the first retaining ring and the contact section of the second retaining ring are arranged or formed in an axially overlapping, and in particular axially overlapping, manner. In other words, the contact sections of the retaining rings for connecting the retaining rings to the receiving areas of the housing or the transmission output shaft can lie in a common plane.Preferably predominantly, and especially preferably almost completely, the contact sections of the retaining rings can be arranged in a common axially extending ring volume area in the final assembly state.

[0017] The (a) tool engagement section and the contact section of the first retaining ring and / or the (b) tool engagement section and the contact section of the further retaining ring can, for example, be arranged or configured axially offset from one another, in particular without overlap. In other words, at least one retaining ring can comprise a first axial section area, which has exclusively a tool engagement section, and a further axial section area, which has exclusively a contact section for connecting the retaining ring to the housing and / or to the transmission output shaft. At least one retaining ring can have a greater axial length than the other retaining ring. The retaining ring with the greater axial length can, for example, bridge an annular gap or annular gap-like space reduced by the other retaining ring by means of a bridging section.In other words, at least in the final assembly state, at least one retaining ring can have a first section that axially overlaps with the other retaining ring and a second section that does not axially overlap with the other retaining ring, wherein the overlapping section is oriented towards the bearing or located closer to the bearing. The ratio of the axial length of the first section to the second section can be, for example, 0.5 to 2, preferably 0.75 to 1.5, and particularly preferably 0.9 to 1.1.

[0018] It is possible for the tool engagement section of the first and / or second retaining ring to be designed as an inner or outer circumferential surface. Preferably, the tool engagement section of the first retaining ring (e.g., mounted or mountable on the housing side) is designed at least partially, and in particular completely, as an inner circumferential surface, and the tool engagement section of the second retaining ring (e.g., mounted or mountable on the transmission output shaft side) is designed at least partially, and in particular completely, as an outer circumferential surface. The inner or outer circumferential surface can, for example, be designed as the cylindrical surface of a retaining ring. The cylindrical surface can be an outwardly facing surface (outer circumferential surface) or an inwardly facing surface (inner circumferential surface).The tool engagement section can have a shape that corresponds to a counter-shape of the tool, such that a torque-transmitting connection can be formed or is formed in the engagement state of the tool engagement section and the tool.

[0019] An inner circumferential surface of a retaining ring can, for example, be understood as the surface which forms a channel-like section, wherein the channel-like section forms an annular gap volume or an annular gap-like space with the transmission output shaft arranged coaxially within the channel, into which the further retaining ring engages at least partially.

[0020] The tool engagement section serves for positive engagement with a tool, particularly one designed as a wrench. For this purpose, the tool engagement section and the tool can comprise corresponding sections; for example, the inner or outer circumferential surface has a cross-sectional shape that corresponds to the engagement shape of a wrench-shaped tool. In other words, the tool can establish a torque-transmitting connection with the retaining ring by engaging the tool engagement section. The cross-sectional shape of the inner or outer circumferential surface of the retaining ring and / or retaining rings can, for example, be point-symmetric, mirror-symmetric, and / or rotationally symmetric.

[0021] It is possible that at least the first and / or the second retaining ring is made, at least partially, and in particular completely, of metal, preferably iron, particularly preferably steel, and most preferably steel of specification C45E and / or C45R. The housing, for example, can be made, at least partially, and in particular completely, of metal, preferably iron, particularly preferably steel, and most preferably nitrided steel.

[0022] The first and / or subsequent retaining ring preferably has a width-to-outer-diameter ratio of 0.05 to 0.50, more preferably 0.08 to 0.30, and most preferably 0.10 to 0.20. Most preferably, the retaining ring that can be mounted on the housing side has a width-to-outer-diameter ratio of 0.12 to 0.15. Alternatively or additionally, the wider retaining ring can, for example, have a width-to-circular-ring width ratio of 0.9 to 2.1, more preferably 1.05 to 1.75, more preferably 1.25 to 1.55, and most preferably 1.35 to 1.45. The specified ratio ranges provide a suitable method for fixing a bearing within a rotary actuator, in particular a rotary actuator with a height or outer diameter of [missing information].which has an outer diameter of its housing of 80 to 104 mm, preferably 84 to 100 mm, and particularly preferably 89 to 95 mm. The specified ratio ranges are particularly preferred in connection with the materials mentioned above. The ratios refer in particular to a retaining ring that comprises a first axial section with a tool engagement section and a further axially offset section (bridging section) with a contact section but without a tool engagement section. The housing or housing body can have, at least at its free end region, for example, a wall thickness of 1 to 5 mm, preferably 1.5 to 3 mm.

[0023] The width (i.e., axial length) of the first retaining ring and the width (i.e., axial length) of the second retaining ring can differ, for example, by a factor of 0.30 to 0.89, preferably by a factor of 0.41 to 0.77, particularly preferably by a factor of 0.53 to 0.65, and most preferably by a factor of 0.56 to 0.62. The specified factor ranges indicate absolute values ​​for the difference in the widths of the retaining rings and thus do not, in principle, indicate which of the two retaining rings is wider and which is narrower. By using retaining rings of different lengths to secure the same bearing within a rotary actuator, a compact and technically reliable rotary actuator can be achieved. The longer design of one retaining ring compared to the other is primarily due to the bridging section of the second retaining ring.

[0024] The outer diameter of the housing can be, for example, 80 to 104 mm, preferably 84 to 100 mm, and particularly preferably 89 to 95 mm. This allows for a compact rotary actuator that is easy to assemble using at least one tool.

[0025] The first and / or subsequent retaining ring can, for example, be designed as a threaded ring, wherein a retaining ring-side contact section for connection with the housing-side receiving area and / or with the transmission output shaft-side receiving area comprises a thread at least partially, and in particular completely. Preferably, the thread of the contact section of a first retaining ring, in particular one to be attached or already attached to the housing, is designed as an external thread, and of the subsequent retaining ring, in particular one to be attached or already attached to the transmission output shaft, as an internal thread. It is possible that the contact section of the first and / or subsequent retaining ring is designed as a fine thread at least partially, and in particular completely.Designing the connection between the housing-side receiving area and the retaining ring-side contact section, and / or between the gearbox output shaft-side receiving area and the retaining ring-side contact section, each as a thread, particularly a fine thread, enables a simple, manufacturable, and technically sufficiently reliable connection option for the axial fixation of the bearing. The fine thread can, for example, have a pitch of 0.5 to 2, particularly 1.

[0026] In addition to the rotary actuator, the invention also relates to a roll stabilizer, preferably for a vehicle, particularly preferably for a motor vehicle or for a road vehicle driven by an engine, particularly preferably for a multi-track motor vehicle, with a rotary actuator according to one of the preceding claims, and a method for mounting a rotary actuator described herein.

[0027] The method for assembling a rotary actuator described herein may, for example, comprise the following process steps: (a) providing a housing in which a gearbox with a gearbox output shaft and a bearing are arranged or formed, (b) attaching a first retaining ring to a receiving area on the housing side, (c) attaching a further retaining ring to a receiving area on the gearbox output shaft side, wherein the retaining ring whose tool engagement section is located or is to be located closer to the bearing in the final assembly state is mounted first. In other words, the retaining ring that points towards the free end of the housing formed by a housing body, or is located closer to the free end of the housing, or is located closer to an opening that introduces a tool into the interior of the housing and is therefore easily accessible to a tool, is mounted last.

[0028] All advantages, details, designs and / or features of the rotary actuator according to the invention are applicable to the roll stabilizer according to the invention and / or to a method for mounting a rotary actuator.

[0029] The invention is explained in more detail with reference to exemplary embodiments in the drawings. These show: Fig. 1 a schematic representation of an end region of a rotary actuator according to an exemplary embodiment; Fig. 2 A schematic representation of an end region of a rotary actuator according to a further embodiment.

[0030] In Fig. Figure 1 shows a section of a rotary actuator 1 for roll stabilization of a motor vehicle (not shown). The rotary actuator 1 has a housing 2 which comprises a circular cylindrical housing body. A gearbox with a gearbox output shaft 3 is located in the housing 2 (see Figure 1). Fig. 1) is mounted, which is supported against the housing 2 by a bearing 4. The bearing 4 has an outer bearing ring facing the housing 2 and an inner bearing ring facing the transmission output shaft 3, whereby rolling elements, in particular ball elements, may be arranged or formed between the two bearing rings. Alternatively or additionally, the bearing rings may be in direct sliding contact, at least partially, in particular completely. The bearing 4 is secured in the axial direction by a locking device 5.The locking device 5 comprises a first retaining ring 7, which is attached or attachable to a receiving area 6 on the housing side, and a further retaining ring 9, which is attached or attachable to a receiving area 8 on the transmission output shaft side. The first and the second retaining rings 7, 9 each comprise a tool engagement section 10, 11 for the temporary engagement of a tool (not shown), wherein the tool engagement sections 10, 11 of the first and the further retaining rings 7, 9 are arranged axially offset from one another. This means, for example, that the tool engagement sections 10, 11 are arranged or designed to be non-overlapping in their axial extent. Thus, for example, in the embodiment according to... Fig. It is evident that, as long as the second retaining ring 9 has not yet been inserted into or mounted in the housing 2, sufficient clearance (annular gap) exists inside the housing 2 to engage a tool with the tool engagement section 10 of the first retaining ring 7, which is mounted on the housing 2. In this engagement state, a torque can be transmitted from the tool to the first retaining ring 7, and finally, the retaining ring 7 can be connected via its externally threaded contact section 12 to an internally threaded receiving area 6 of the housing 2.

[0031] The tool engagement sections 10, 11 of the first and the further retaining ring 7, 9 can, for example, be arranged in a non-overlapping axial manner in the final assembly state. Fig. 1 The tool engagement section 10 of the first retaining ring 7 is arranged closer to the bearing 4 than the tool engagement section 11 of the further retaining ring 9, wherein the two tool engagement sections 10, 11 are arranged such that they do not overlap or have no axially coinciding area in the final assembly state of the rotary actuator 1.

[0032] It is possible that the first retaining ring 7 comprises a contact section 12, via which it is connected or connectable to the housing-side receiving area 6, and the further retaining ring 9 comprises a contact section 13, via which it is connected or connectable to the transmission output shaft-side receiving area 8, wherein, at least in the final assembly state, the contact section 12 of the first retaining ring 7 and the contact section 13 of the further retaining ring 9 are arranged to overlap axially, in particular to coincide axially.

[0033] In the illustrated embodiment, the housing-side receiving area 6 and the transmission output shaft-side receiving area 8 are arranged to axially overlap, in particular to overlap axially at least partially, and in particular completely. The overlap of the two receiving areas 6, 8 can be, for example, at least 60%, preferably at least 80%, and most preferably at least 90%.

[0034] The tool engagement section 10 and the contact section 12 of the first retaining ring 7 and / or the tool engagement section 11 and the contact section 13 of the further retaining ring 9 can, for example, be arranged or configured axially offset from one another, in particular without overlap. For example, in the embodiment according to Fig. 1. The tool engagement section 11 of the further retaining ring 9 is axially offset or not completely overlapping with a contact section 13 of the further retaining ring 9, whereas the tool engagement section 10 of the first retaining ring 7 is axially overlapping with the contact section 12. In the embodiment of Fig. In 2 this configuration is reversed, so that the first retaining ring 7 to be attached to the housing 2 has a tool engagement section 10 offset relative to the contact section 12 and the further retaining ring 9 comprises a tool engagement section 11 offset relative to its contact section 13.

[0035] In an alternative embodiment (not shown), the receiving area 6 arranged on the housing 2 and the receiving area 8 arranged on the transmission output shaft 3 can be arranged predominantly without overlapping, preferably with a maximum overlap of 20%, particularly preferably with a maximum overlap of 10%, and most preferably without overlapping at all. It can simultaneously be provided that, in the final assembly state of the rotary actuator, the tool engagement section 10 of the first retaining ring 7 and the contact section 12 of the first retaining ring 7 lie in a common plane, preferably overlapping by at least 50%, particularly preferably by at least 75%, and most preferably by 100%. 100% overlap here means that the axial extent of one contact section lies entirely within the axial extent of the other contact section.Additionally, it can be provided that, in the final assembly state of the rotary actuator, the tool engagement section 11 of the further retaining ring 9 and the contact section 13 of the further retaining ring 9 lie in a common plane, preferably overlapping by at least 50%, particularly preferably by at least 75%, and most preferably by 100%. Overlapping here means axial superimposition or that the extent of one lies entirely within the extent of the other. At least in the final assembly state, at least one retaining ring 7, 9 can have a first section 14 that axially overlaps with the further retaining ring 7, 9 and a second section 15 that does not axially overlap with the further retaining ring, wherein the overlapping section 14 is preferably oriented towards or located closer to the bearing 4.Preferably, section 14 touches bearing 4 in the final assembly state, see . Fig. 2.

[0036] The at least one tool engagement section 10, 11 can be configured as an inner or outer circumferential surface of the first and / or second retaining ring 7, 9. Preferably, the tool engagement section 10 of the first retaining ring 7 is configured at least partially, and in particular completely, as an inner circumferential surface, and the tool engagement section 11 of the further retaining ring 9 is configured at least partially, and in particular completely, as an outer circumferential surface, cf. Fig. 2. The tool engagement section 10 of the retaining ring 7 attached to the housing 2 is in Fig. 2 is arranged on the inner circumference and thus on the inner circumferential surface of the retaining ring 7, which is designed as a hollow cylinder. The tool engagement section 10 is provided with a tooth-like or tooth-shaped tool engagement structure. The tool engagement section 11 of the further retaining ring 9, which is attached to the transmission output shaft 3, is, in the embodiment according to Fig. 2 arranged on the outer circumferential surface or on an outer lateral surface of a further retaining ring 9 designed as a hollow cylinder. The tool engagement section 11 of the further retaining ring 9 can also comprise a tooth-like and / or tooth-shaped tool engagement structure.

[0037] The first and / or the subsequent retaining ring 7, 9 can, for example, have a width 16, 16', 17, 17' (length in the axial direction) to outer diameter 18, 19 of the retaining ring 7, 9 ratio of 0.05 to 0.50, preferably of 0.08 to 0.30, particularly preferably of 0.10 to 0.20; most preferably, the retaining ring 7, which can be attached to the housing, has a width 16, 16' to outer diameter 18 ratio of 0.12 to 0.15. The figures show the width 16, 16' of the first retaining ring 7 and the width 17, 17' of the subsequent retaining ring 9. Furthermore, the outer diameter or the outer diameter 18 of the first retaining ring 7 and the outer diameter 19 of the further retaining ring 9 are indicated in the figures for the depicted section of the retaining rings 7, 9.

[0038] The wider retaining ring 7, 9 can have a width 16, 16, 17, 17' (length in the axial direction) to ring width 20, 21 ratio of 0.9 to 2.1, preferably 1.05 to 1.75, particularly preferably 1.25 to 1.55, and most preferably 1.35 to 1.45. The ring widths 20, 21 for the respective retaining rings 7, 9 result from the respective difference between the minimum and maximum radial extent of the retaining rings 7, 9. In a specific embodiment, the ring width 20, 21 of the first and / or further retaining ring 7, 9 can be in a range of 8 to 20 mm, preferably between 10 and 14 mm, and particularly preferably between 11 and 13 mm.

[0039] The axial length or width 16, 16' of the first retaining ring 7 and the axial length or width 17, 17' of the second retaining ring 9 can differ by a factor of 0.30 to 0.89, preferably by a factor of 0.41 to 0.77, particularly preferably by a factor of 0.53 to 0.65, and most preferably by a factor of 0.56 to 0.62. These defined length differences of the two retaining rings 7, 9 of a rotary actuator 1 allow both retaining rings 7, 9 to be attached or mounted to the tool engagement sections 10, 11 on the retaining ring side, even with a small annular gap, and also allow both retaining rings 7, 9 to be brought into contact with the bearing 4 or to be in contact with the bearing 4 in the final assembly state.

[0040] The outer diameter 22 of the housing 2 can be, for example, 80 to 104 mm, preferably 84 to 100 mm, particularly preferably 89 to 95 mm.

[0041] The first and / or the subsequent retaining ring 7, 9 can, for example, be designed as a threaded ring, wherein a retaining ring-side contact section 12, 13 for connection with the housing-side receiving area 6 and / or with the transmission output shaft-side receiving area 8 comprises a thread at least partially, and in particular completely, or is designed as a thread. Preferably, the thread of the contact section 12, 13 of a first retaining ring 7 is designed as an external thread and of the subsequent retaining ring 9 as an internal thread. It can further be advantageous if the contact section 12, 13 of the first and / or the subsequent retaining ring 7, 9 is designed as a fine thread at least partially, and in particular completely.

[0042] The rotary actuator 1 can form part of a roll stabilizer (not shown) or be integrated into a roll stabilizer.

[0043] It may prove advantageous to carry out the following process steps for the assembly of the rotary actuator 1 described herein: (a) providing a housing 2 in which a gearbox comprising a gearbox output shaft 3 and a bearing 4 are arranged or formed, (b) attaching a first retaining ring 7 to a housing-side receiving area 6, (c) attaching a further retaining ring 9 to a gearbox output shaft-side receiving area 8, wherein the retaining ring 7, 9 is mounted first whose tool engagement section 10, 11 is or is to be arranged closer to the bearing 4 in the final assembly state. Reference symbol list 1 rotary actuator 2 cases 3 Gearbox output shaft 4 bearings 5 Safety device 6 Recording area of ​​2 7 first retaining ring 8 Recording area of ​​3 9 additional retaining rings 10 Tool engagement section of 7 11 Tool engagement section of 9 12 contact sections of 7 13 contact section of 9 14 covering section area 15 non-covering section area 16, 16' width of 7 17, 17' width of 9 18 outer diameters of 7 19 Outer diameter of 9 20 ring width of 7 21 Circle width of 9 22 Outer diameter of 2

Claims

[1] Rotary actuator (1) for roll stabilization of a motor vehicle, wherein the rotary actuator (1) comprises: a housing (2), a gearbox received in the housing (2) with a gearbox output shaft (3) which is supported against the housing (2) by a bearing (4), wherein the bearing (4) is secured in the axial direction by a locking device (5), characterized by , that the locking device (5) has a first retaining ring (7) which is attached or attachable to a receiving area (6) on the housing side and a further retaining ring (9) which is attached or attachable to a receiving area (8) on the transmission output shaft side, wherein the first and the second retaining ring (7, 9) each comprise a tool engagement section (10, 11) for the temporary engagement of a tool, wherein the tool engagement sections (10, 11) of the first and the further retaining ring (7, 9) are arranged axially offset from each other. [2] Rotary actuator (1) according to claim 1, characterized by , that the tool engagement sections (10, 11) of the first and the further retaining ring (7, 9) are arranged in a non-intersecting axial manner in the final assembly state. [3] Rotary actuator (1) according to claim 1 or 2, characterized by , that at least in the final assembly state the housing-side receiving area (6) and the gearbox output shaft-side receiving area (8) are arranged to overlap axially, in particular to coincide axially. [4] Rotary actuator (1) according to any one of claims 1 to 3, characterized by, that the first retaining ring (7) comprises a contact section (12) via which it is connected or connectable to the housing-side receiving area (6) and the further retaining ring (9) comprises a contact section (13) via which it is connected or connectable to the transmission output shaft-side receiving area (8), wherein at least in the final assembly state the contact section (12) of the first retaining ring (7) and the contact section (13) of the further retaining ring (9) are arranged to overlap axially, in particular to coincide axially. [5] Rotary actuator (1) according to any one of the preceding claims, characterized by , that - the tool engagement section (10) and the contact section (12) of the first retaining ring (7) and / or - the tool engagement section (11) and the contact section (13) of the further retaining ring (9) are arranged or designed axially offset from each other, in particular without overlap. [6] Rotary actuator (1) according to any one of the preceding claims, characterized by , that at least in the final assembly state at least one retaining ring (7, 9) has a first section area (14) that overlaps with the further retaining ring (7, 9) and a second section area (15) that does not overlap with the further retaining ring (7, 9), wherein the overlapping section area (14) is arranged lying towards or closer to the bearing (4). [7] Rotary actuator (1) according to any one of the preceding claims, characterized by, that the tool engagement section (10, 11) is designed as an inner or outer circumferential surface of the first and / or second retaining ring (7, 9), preferably the tool engagement section (10) of the first retaining ring (7) is designed at least partially, in particular completely, as an inner circumferential surface and the tool engagement section (11) of the further retaining ring (9) is designed at least partially, in particular completely, as an outer circumferential surface. [8] Rotary actuator (1) according to any one of the preceding claims, characterized by , that the first and / or the further retaining ring (7, 9) has a width-(16, 16', 17, 17')-to-outer-diameter-(18, 19) ratio of 0.05 to 0.50, preferably of 0.08 to 0.30, particularly preferably of 0.10 to 0.20, most preferably the retaining ring (7) that can be attached or is attached to the housing side has a width-(17, 17')-to-outer-diameter-(18) ratio of 0.12 to 0.

15. [9] Rotary actuator (1) according to any one of the preceding claims, characterized by , that the wider retaining ring (7, 9) has a width-(16, 16', 17, 17')-to-circular-ring-width-(20, 21) ratio of 0.9 to 2.1, preferably of 1.05 to 1.75, particularly preferably of 1.25 to 1.55, most preferably of 1.35 to 1.

45. [10] Rotary actuator (1) according to any one of the preceding claims, characterized by , that the width (16, 16') of the first retaining ring (7) and the width (17, 17') of the further retaining ring (9) differ by a factor of 0.30 to 0.89, preferably by a factor of 0.41 to 0.77, particularly preferably by a factor of 0.53 to 0.65, most preferably by a factor of 0.56 to 0.

62. [11] Rotary actuator (1) according to any one of the preceding claims, characterized by , that the outer diameter (22) of the housing (2) is 80 to 104 mm, preferably 84 to 100 mm, particularly preferably 89 to 95 mm. [12] Rotary actuator (1) according to any one of the preceding claims, characterized by , that the first and / or the further retaining ring (7, 9) is designed as a threaded ring, wherein a retaining ring-side contact section (12, 13) for connection with the housing-side receiving area (6) and / or with the transmission output shaft-side receiving area (8) comprises at least a section, in particular completely, a thread, preferably the thread of the contact section (12) of a first retaining ring (7) is designed as an external thread and of the further retaining ring (9) as an internal thread, particularly preferably the contact section (12, 13) of the first and / or the further retaining ring (7, 9) is designed at least a section, in particular completely, as a fine thread. [13] Roll stabilizer, preferably for a vehicle, particularly preferably for a motor vehicle, with rotary actuator (1) according to one of the preceding claims. [14] Method for assembling a rotary actuator (1) according to any one of claims 1 to 12, comprising the method steps: - Providing a housing (2) in which a gearbox equipped with a gearbox output shaft (3) and a bearing (4) are arranged or formed, - Attaching a first retaining ring (7) to a housing-side receiving area (6), - Attaching a further retaining ring (9) to a receiving area (8) on the gearbox output shaft side, wherein - the retaining ring (7, 9) is mounted first, the tool engagement section (10, 11) of which is or is to be positioned closer to the bearing (4) in the final assembly state.

Images