Roll stabilizer for a motor vehicle

Abstract

Roll stabilizer for a motor vehicle with a split transverse stabilizer (2), between whose two stabilizer parts (3), (4) designed as torsion bar springs an actuator (1) is effectively arranged, which has a housing (5) and a motor arranged in the housing (5), as well as a reduction gear (7) connected to the motor, the output shaft (6) of which is rotatably mounted on one stabilizer part (4) on the housing (5) via a rolling bearing, the rolling elements of which roll on raceways, and wherein a preloading element (16) is provided for preloading the rolling bearing, characterized in that the rolling bearing has a bearing ring provided with a raceway for rolling elements, which is axially displaceable and is axially acted upon by the preloading element (16) which is effective in the axial direction of the transverse stabilizer (2).

Description

[0001] The present invention relates to a roll stabilizer for a motor vehicle. Such roll stabilizers serve the purpose of counteracting body roll during cornering.

[0002] From DE 10 2009 006 385 A1, for example, a roll stabilizer according to the features of the preamble of claim 1 is known. An inner ring of a double-row angular contact ball bearing is arranged on the output shaft of the roll stabilizer's reduction gear. A union nut screwed onto the output shaft secures the inner ring to the output shaft in axial directions by clamping the inner ring axially between a stop formed on the output shaft and a stop surface of the union nut.

[0003] The position of the stop on the output shaft must be tightly toleranced in the axial directions to ensure that the double-row angular contact ball bearing is properly adjusted.

[0004] A roll stabilizer is also known from DE 10 2011 053 278 A1. For backlash-free and low-noise torque transmission, roller-shaped rolling elements are arranged between the outer profiles of a drive wheel and the corresponding inner profile of an output wheel. These rolling elements are pressed radially outwards by elastomer rings seated in pairs in circumferential grooves of the drive wheel.

[0005] The object of the present invention was to provide a roll stabilizer according to the features of the preamble of claim 1, which is easy to manufacture.

[0006] According to the invention, this problem is solved by the roll stabilizer according to claim 1. The roll stabilizer according to the invention has a split transverse stabilizer, between the two stabilizer sections of which are designed as torsion bar springs, an actuator is effectively arranged. The actuator has a housing in which a motor and a reduction gear connected to the motor are arranged. An output shaft of the reduction gear is fixedly arranged to one stabilizer section and rotatably mounted on the housing via a rolling bearing. Rolling elements of the rolling bearing roll on raceways. By providing a preload element for preloading the rolling bearing, it is ensured that the rolling bearing is arranged without play even in the unloaded state. Disturbing noises, such as those that can occur with a rolling bearing with play, are avoided.The output shaft can be formed in one piece or in multiple parts, consisting of several permanently joined components. For example, in the case of a double-row angular contact ball bearing, a radially inner ball groove can be integrally formed on the output shaft. Alternatively, an inner ring with the ball groove can be arranged on the output shaft.

[0007] The rolling bearing is equipped with an axially displaceable bearing ring that has a raceway for the rolling elements. In the axial direction of the transverse stabilizer, the bearing ring is subjected to axial force by the preload element. Consequently, a preload force is exerted on the displaceable bearing ring, ensuring zero play in the rolling bearing.

[0008] The preload element advantageously comprises a union nut screwed onto the output shaft and a spring element effectively arranged between the union nut and an inner ring formed by the bearing ring. The spring element can be, for example, a rubber ring arranged coaxially on the union nut, a disc spring, or a wave spring. This spring element is supported on one side by the union nut and spring-loaded against the inner ring on the other. The spring element can also be formed from several individual springs distributed around the circumference of the union nut.

[0009] The rolling bearing is advantageously formed by a double-row angular contact ball bearing, the inner ring of which is provided with a ball groove for balls and is axially displaceable on the output shaft for adjusting the preload of the angular contact ball bearing. The preload force can be determined by a suitable selection of the spring element.

[0010] The union nut can be securely fastened to the output shaft by providing a stop on the output shaft against which the union nut can be screwed. This stop serves both to secure the union nut to the output shaft and to define its axial position, allowing a defined preload force to be exerted via the spring element.

[0011] The union nut can have a receiving recess on its end face facing the stop, in which the spring element is arranged. This receiving recess can be arranged in a ring shape around the union nut, with the spring element being located within the receiving recess.

[0012] The union nut can be provided on its end face facing the stop with a first stop surface for abutting the stop, with the receiving chamber arranged radially outside the stop surface. This arrangement of the receiving chamber allows for a structurally simple design of the output shaft: The output shaft can be provided with a smaller-diameter section onto which the union nut is screwed; the union nut can be provided axially adjacent to this smaller section with a larger-diameter section on which the inner ring is arranged. On its axial side facing the smaller-diameter section, the larger-diameter section can be provided with the aforementioned stop surface for the union nut.Because the receiving space is arranged radially outside the first stop surface, it is ensured that the spring element arranged in this receiving space can be springed against the inner ring without any problems.

[0013] Advantageously, the union nut can be provided with a second stop surface for the inner ring. In this case, the receiving space can be arranged radially between the first and second stop surfaces. While the first stop surface is designed to abut against the output shaft, the second stop surface is intended to abut the inner ring if it is pressed towards the union nut by overcoming the spring force of the spring element.

[0014] The invention is explained in more detail below with reference to an embodiment illustrated in two figures. These show: Fig. 1 a roll stabilizer according to the invention in schematic representation and Fig. 2. A close-up of this roll stabilizer.

[0015] Fig. Figure 1 shows a schematic representation of a roll stabilizer with an actuator 1 connected to a split transverse stabilizer 2. The transverse stabilizer 2 has two stabilizer parts 3 and 4, wherein one stabilizer part 3 is connected on the stator side to a housing 5 of the actuator 1, and wherein the stabilizer part 4 is rotationally fixed to an output shaft 6 (see Figure 1). Fig. 2) is connected.

[0016] Fig. Figure 2 shows a longitudinal section enlargement of the actuator 1. A reduction gear 7 of the actuator 1 (not shown) is provided with the output shaft 6. The output shaft 6 is rotatably mounted on the housing 5 of the actuator 1 via a double-row angular contact ball bearing 8 in an O-arrangement. The double-row angular contact ball bearing 8 has an outer ring 9 received in the housing 5, which is provided with two ball grooves 10 for the two rows of balls 11. The output shaft 6 has a shoulder 12 on which a further ball groove 13 is formed for the balls 11 of one row of balls 11. An axially displaceable inner ring 14 is arranged on the output shaft 6, which is provided with a further ball groove 15 for the balls 11 of the other row of balls.

[0017] A preloading element 16 is provided for preloading the double-row angular contact ball bearing 8. This preloading element 16 comprises a spring element 17, which is axially spring-loaded against the inner ring 14 of the angular contact ball bearing 8. The preloading element 16 also has a cap nut 18, which is screwed onto a section of the output shaft 6 with a smaller diameter. The spring element 17 is supported on one side by the cap nut 18 and axially spring-loaded against the inner ring 14 on the other side.

[0018] The Fig. 2 shows that between the smaller diameter section and the larger diameter section of the output shaft 6, a shoulder surface 19 is formed on the larger diameter section, which projects radially beyond the smaller diameter section and serves as a stop 20 for the union nut 18.

[0019] The union nut 18 is provided on its end face facing the angular contact ball bearing 8 with a first stop surface 21 for abutting the stop 20. On this end face, the union nut 18 has an annular recess 22 arranged around the union nut 18, in which the spring element 17 is arranged. The union nut 18 is also provided on this end face with a second stop surface 23, which is designed to abut the inner ring 14 if the inner ring 14 is deflected axially towards the union nut 18 against a preload force of the spring element 17. The spring element 17 is arranged radially between the first stop surface 21 and the second stop surface 23. In the exemplary embodiment, the two stop surfaces 21, 23 are arranged flush with each other; however, arrangements of these two stop surfaces that are axially offset or inclined relative to each other are also conceivable due to design constraints.The . Fig. Figure 2 shows that the first stop surface 21 rests against the shoulder surface 19. In this way, the union nut is securely fixed on the output shaft 6. Furthermore, the axial position of the union nut 18 on the output shaft 6 is clearly defined, so that the spring element is springed against the inner ring 14 with a defined preload force.

[0020] In the exemplary embodiment, the preload element 16 is provided with a cassette seal 24, which is designed to properly close an annular gap formed between the union nut 18 and the housing 5.

[0021] Another variant, not shown here, provides that – unlike in the exemplary embodiment – ​​the outer ring is designed in two parts, with the spring element axially springed against one outer ring part to preload the rolling bearing. This variant can be used for double-row angular contact ball bearings in an X arrangement. List of position numbers 1 actuator 2 Cross stabilizer 3 Stabilizer part 4 Stabilizer part 5 cases 6 Output shaft 7 reduction gears 8 double-row angular contact ball bearings 9 outer ring 10 ball groove 11 balls 12 Shoulder 13 ball groove 14 inner ring 15 ball groove 16 Preload element 17 Spring element 18 Union nut 19 Shoulder area 20 attacks 21 first stop surface 22 ring-shaped recesses 23 second stop surface

Claims

[1] Roll stabilizer for a motor vehicle with a split transverse stabilizer (2), between whose two stabilizer parts (3) designed as torsion bar springs, (4) an actuator (1) is effectively arranged, which has a housing (5) and a motor arranged in the housing (5), as well as a reduction gear (7) connected to the motor, the output shaft (6) of which is rotatably mounted on one stabilizer part (4) on the housing (5) via a rolling bearing, the rolling elements of which roll on raceways, and wherein a preloading element (16) is provided for preloading the rolling bearing, characterized by , that the rolling bearing has a bearing ring provided with a raceway for rolling elements, arranged in an axially displaceable manner, which is axially acted upon by the preload element (16) acting in the axial direction of the transverse stabilizer (2). [2] Roll stabilizer according to claim 1, wherein the preload element (16) comprises a union nut (18) screwed onto the output shaft (6) and a spring element (17) which is effectively arranged between the union nut (18) and an inner ring (14) formed by the bearing ring. [3] Roll stabilizer according to claim 2, the rolling bearing of which is formed by a double-row angular contact ball bearing (8), the inner ring (14) of which is provided with a ball groove (15) for balls (11) and is arranged axially displaceably on the output shaft (6) for adjusting a preload of the angular contact ball bearing (8). [4] Roll stabilizer according to claim 2, the output shaft (6) of which has a stop (20) for the union nut (18). [5] Roll stabilizer according to claim 4, the union nut (18) of which has a receiving space on its end face facing the stop (20) in which the spring element (17) is arranged. [6] Roll stabilizer according to claim 5, the receiving chamber of which is arranged in a ring shape around the union nut (18), wherein the spring element (17) is arranged in the receiving chamber. [7] Roll stabilizer according to at least one of claims 5 to 6, the union nut (18) having on its end face facing the stop (20) a first stop surface (21) for abutting the stop (20), wherein the receiving space is arranged radially outside the first stop surface (21). [8] Roll stabilizer according to at least one of claims 5 to 7, the union nut (18) of which is provided with a second stop surface (23) for the inner ring (14).

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