Sensor wheel, arrangement, differential gear and vehicle

Abstract

A sensor wheel (10) for detecting the rotational speed of a rotatable component, in particular a vehicle. The sensor wheel (10) has an opening (12) for attaching the sensor wheel (10) to the component and a step (14) for centering the sensor wheel (10) on the component. The step (14) is designed to deform when the sensor wheel (10) is attached to the component, thereby reducing the size of the opening (12) and centering the sensor wheel (10) on the component.

Description

State of the art

[0001] The invention relates to a sensor wheel, an arrangement, a differential gear and a vehicle.

[0002] DE 44 10 074 C2 shows a drive axle with an axle housing. An electric motor and a differential gear are arranged in the axle housing. The differential gear is mounted in a differential carrier. The differential carrier is connected to a sensor of a speed sensor. Disclosure of the invention

[0003] The object of the invention is to provide a sensor wheel that simplifies and facilitates assembly. Furthermore, the object of the present invention is to provide an assembly, a differential gear, and a vehicle, each comprising such a sensor wheel.

[0004] The object underlying the invention is achieved by a sensor wheel having the features of claim 1, an arrangement having the features of claim 7, a differential gear having the features of claim 9, and a vehicle having the features of claim 10. Advantageous developments of the invention are recited in the subclaims.

[0005] A sensor wheel according to the invention is designed to detect a rotational speed of a rotatable component, in particular of a vehicle, for example, by means of a sensor. The sensor wheel has an opening for attaching the sensor wheel to the component and a step for centering the sensor wheel on the component. The step is designed to deform when the sensor wheel is attached to the component, reducing the opening, and to center the sensor wheel on the component by reducing the opening.

[0006] Advantageously, an additional component, such as a rolling bearing, can deform the step during assembly, thereby centering the sensor wheel on the component. Centering of the sensor wheel can occur simultaneously, particularly simultaneously, with the assembly of the additional component. This reduces the number of steps required for assembly. The sensor wheel thus facilitates and simplifies assembly.

[0007] The speed of the rotating component can be recorded for a tachograph application.

[0008] The sensor wheel can also be referred to as a sender wheel. The sensor wheel can be constructed as a single piece.

[0009] The step may be a molded step. The step may have one or more, in particular 2 to 30, step segments.

[0010] The component may be a shaft. The component may have a portion for receiving the sensor wheel. The step may be configured to center the sensor wheel on the portion by reducing the opening.

[0011] The opening can be circular. The opening can be designed for attaching the sensor wheel to the component, particularly when the step is not deformed. Attaching the sensor wheel can be done without pressing it onto the component. Attaching the sensor wheel can be referred to as "laying it on." The diameter of the opening can be dimensioned such that a clearance fit is formed between the sensor wheel and the component when the step is not deformed.

[0012] The reduction of the opening can be achieved in such a way that a press fit is formed between the sensor wheel and the component when the step is deformed.

[0013] In other words, by reducing the opening, an interference fit can be formed between the sensor wheel and the component.

[0014] The sensor wheel can be attached to the component when the sensor wheel is centered on the component and / or when the press fit is established. The sensor wheel can be attached to the component using the additional component.

[0015] The deformation of the step can be elastic and / or plastic. The deformation of the step can be a flattening of the step. The reduction of the opening can be a radial reduction of the opening.

[0016] The sensor wheel can have a plurality, in particular 10 to 25, of sensor elements. Each sensor element can extend in the axial direction of the sensor wheel. The plurality of sensor elements can be configured to be detected by the sensor. In particular, during rotation of the component, the sensor can detect the individual sensor elements and determine a rotational speed of the component based on a number of detected sensor elements. Each sensor element can be formed by openings and / or interruptions in the sensor wheel.

[0017] The sensor wheel may have a base portion, a sensor portion and a centering portion.

[0018] The base portion may be annular. The base portion may be disc-shaped. The base portion may have a recess for forming the opening.

[0019] The plurality of sensor elements can define the sensor section. The sensor section can be annular. The sensor section can be arranged on the base section. The sensor section can delimit the base section radially outward.

[0020] The step can define the centering section. The centering section can be formed adjacent to the base section. The centering section can be arranged on the base section, in particular offset in the axial direction.

[0021] The centering section can be arranged on the recess. The step can protrude into the clear cross-section of the recess to form the opening.

[0022] In a further development of the sensor wheel, the step delimits the opening, particularly in sections. The step can be formed circumferentially around the opening, particularly in sections. The step can form and / or define the opening.

[0023] In a further development of the sensor wheel, the sensor wheel has a number, in particular 1 to 4, of projections. The projections are designed to prevent rotation of the sensor wheel, in particular in a rotational direction, preferably about a longitudinal axis of the component, relative to the component, especially when the sensor wheel is attached to the component. The number of projections delimits the opening. Each projection can extend in a radial direction of the sensor wheel. The number of projections can interrupt the step. The number of projections can divide the step into step segments.

[0024] The number of projections may be formed on the annular base portion. The number of projections may extend into the clear cross-section of the recess.

[0025] In a further development of the sensor wheel, the sensor wheel has a number of interruptions, in particular 10 to 25, that divide the step into step segments. The step segments can be finger-shaped.

[0026] In a further development of the sensor wheel, the step has a chamfer, a bead, a embossed portion, a fold, a collar, or a groove. Alternatively, the step is designed as a chamfer, a bead, an embossed portion, a fold, a collar, or a groove.

[0027] In a further development of the sensor wheel, the sensor wheel is a bent sheet metal part.

[0028] An arrangement according to the invention for a differential gear of a vehicle comprises a previously described sensor wheel, a differential carrier, and a differential bearing. The differential carrier is designed to accommodate at least one planetary gear of the differential gear. The differential bearing is designed to accommodate at least a portion of the differential carrier. The sensor wheel is attached to the differential carrier by means of the differential bearing. The sensor wheel can be secured against axial displacement by means of the differential bearing. The differential carrier can be the component.

[0029] In a further development of the arrangement, the differential bearing is designed to act on the sensor wheel when receiving the at least one section of the differential carrier in such a way that the step deforms, reducing the opening, and centers the sensor wheel on the component by reducing the opening. In other words, the arrangement can be designed such that when the differential bearing is pressed onto the at least one section of the differential carrier, the differential bearing acts on the sensor wheel in such a way that the step deforms, reducing the opening, and centers the sensor wheel on the component by reducing the opening.

[0030] A differential gear according to the invention has a previously described arrangement. The differential gear can be designed for use in a vehicle.

[0031] A vehicle according to the invention, in particular a motor vehicle, has a differential gear as described above. The vehicle can be a partially or fully electric vehicle.

[0032] Possible embodiments of the invention are explained below with reference to the accompanying drawings. They show: Fig. 1 a schematic sectional view of a sensor wheel with a step, Fig. 2 a schematic sectional view of the sensor wheel of Fig. 1 with deformed step, Fig. 3 a schematic plan view of the sensor wheel of Fig. 1, Fig. 4 a schematic view of a differential gear with the sensor wheel of Fig. 1, Fig. 5 a schematic sectional view of the differential gear of Fig. 4, Fig. 6 a schematic plan view of the differential gear of Fig. 4 without a differential bearing of the differential gear, Fig. 7 a schematic plan view of a variant of the sensor wheel of Fig. 1 to 6.

[0033] Fig. 1 and Fig. 2 shows a sensor wheel 10 for detecting the rotational speed of a rotating component of a vehicle. The sensor wheel 10 is formed as a single piece. The sensor wheel 10 is a bent sheet metal part. The sensor wheel 10 is cup-shaped.

[0034] The sensor wheel 10 has an opening 12 for fastening the sensor wheel 10 to the component and a step 14 in the form of a collar for centering the sensor wheel 10 on the component.

[0035] The step 14 is designed to deform when the sensor wheel 10 is attached to the component, reducing the size of the opening 12, and to center the sensor wheel 10 on the component by reducing the size of the opening 12.

[0036] In Fig. 1 is the undeformed stage 14 and in Fig. 2 shows the deformed step 14.

[0037] A diameter 16 of the opening 12 is larger when the step 14 is not deformed than when it is deformed. Due to the deformation of the step 14, the diameter 16 of the opening 12 decreases. The deformation of the step 14 levels the step 14.

[0038] The sensor wheel 10 has a plurality of encoder elements 18. The encoder elements 18 are evenly distributed around a rotational axis 20 of the sensor wheel 10. When the sensor wheel 10 is attached to the component, the sensor wheel 10 rotates together with the component about the rotational axis 20 to detect the rotational speed of the component.

[0039] The encoder elements 18 are designed to be detected by a sensor. Based on the detected encoder elements 18, the sensor determines the rotational speed.

[0040] Each sensor element 18 is rectangular in shape. Each sensor element 18 extends in an axial direction 22 of the sensor wheel 10. The axial direction 22 is parallel to the rotational axis 20.

[0041] In an alternative embodiment not shown, the sensor element may have a non-rectangular shape.

[0042] The sensor wheel has a base section 24, a sensor section 26 and a centering section 28.

[0043] The base section 24 is annular and disc-shaped. The base section 24 is flat. The base section 24 has a flat sheet metal contour. The base section 24 can form a pot bottom of the pot-shaped sensor wheel 10. The base section 24 has a recess 25 for forming the opening 12. The recess 25 is circular. A diameter 30 of the recess 25 is independent of any deformation of the step 14. In other words, the diameter 30 of the recess 25 is the same whether the step 14 is deformed or not.

[0044] The plurality of sensor elements 18 define the sensor section 26. The sensor section 26 is annular. The sensor section 26 is arranged on the base section 24. The sensor section 26 delimits the base section 24 radially outward.

[0045] The step 14 defines the centering section 28. The centering section 28 adjoins the base section 24. The centering section 28 is arranged on the base section 24 with an offset in the axial direction 22. The centering section 28 is arranged on the recess 25. The step 14 protrudes into the clear cross-section of the recess 25.

[0046] Fig. Figure 3 shows that the step 14 partially delimits the opening 12. The step 14 is formed circumferentially around the opening 12 in sections.

[0047] The sensor wheel 10 has two projections 32. The projections 32 are designed to prevent rotation of the sensor wheel 10 in a rotational direction 34 relative to the component, in particular when the sensor wheel 10 is attached to the component.

[0048] The projections 32 delimit the opening 12. The projections 32 are arranged opposite one another. The projections 32 are arranged within a plane in which the base section 24 is arranged. The projections 32 are arranged on the base section 24. The projections 32 protrude into the clear cross-section of the recess 25. The projections 32 each extend in a radial direction of the sensor wheel 10. The projections 32 are each rectangular in shape.

[0049] The projections 32 interrupt the step 14. The projections 32 divide the step 14 into two opposite step segments 36.

[0050] Fig. 4 and Fig. 5 show a differential gear 200 with an assembly 100. The assembly 100 includes the sensor wheel 10, a differential carrier 38 for receiving at least one planetary gear of the differential gear 200, and a differential bearing 40. A portion of the differential carrier 38 is received by the differential bearing 40.

[0051] The differential bearing 40 has an outer ring 42 and an inner ring 44, see Fig. 5. The sensor wheel 10 is attached to the differential carrier 38 by means of the differential bearing 40. The sensor wheel 10 is secured against displacement in the axial direction 22 by means of the inner ring 44.

[0052] The diameter 16 of the opening 12 is dimensioned such that, when the step 14 is not deformed, a clearance fit is formed between the sensor wheel 10 and the differential carrier 38. Therefore, when the step 14 is not deformed, the sensor wheel 10 can be fitted onto the differential carrier 38 by arranging the differential carrier 38 within the opening 12. Fitting occurs without pressing the sensor wheel 10 onto the differential carrier 38.

[0053] Fig. 6 shows the differential gear 200 without the differential bearing 40. The projections 32 are arranged in a corresponding recess of the differential carrier 38. This creates a positive connection between the projections 32 and the differential carrier 38, which prevents the sensor wheel 10 from rotating in the rotational direction 34 relative to the differential carrier 38.

[0054] The differential carrier 38 has a section 46 in the form of a shoulder for receiving the sensor wheel 10, see Fig. 5. The sensor wheel 10 surrounds the shoulder 46.

[0055] The differential bearing 40, in particular the inner ring 44, is designed to act on the sensor wheel 10 when receiving at least one section of the differential carrier 38 in such a way that the step 14 deforms, reducing the size of the opening 12, and by reducing the size of the opening 12, centers the sensor wheel 10 on the differential carrier 38. The reduction of the opening 12 occurs in such a way that a press fit is formed between the sensor wheel 10 and the differential carrier 38, in particular between the step 14 and the section 46.

[0056] The receiving takes place by pressing the inner ring 44 onto the differential carrier 38. The deformation of the step 14 levels the step 14. In other words, when the inner ring 44 is pressed onto the differential carrier 38, the inner ring 44 levels the step 14, causing the step 14 to act against the section 46 in the radial direction and thereby centering the sensor wheel 10 on the differential carrier 38. The differential bearing 40, in particular the inner ring 44, is pressed onto the differential carrier 38 until it stops.

[0057] Fig. 7 shows a variant of the sensor wheel 10 of Fig. 1 to 6, wherein identical reference numerals are used for identical and functionally equivalent elements and in this respect reference is made to the above explanations regarding the embodiment of the Fig. 1 to 6, so that essentially only the existing differences are discussed.

[0058] The sensor wheel 10 has a plurality of interruptions 48 that divide the step 14 into a plurality of step segments 50. The step segments 50 are finger-shaped.

[0059] In an alternative embodiment not shown, a vehicle, in particular a motor vehicle, comprises the differential gear 200 of Fig. 4 to 6. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 44 10 074 C2

[0002]

Claims

[1] Sensor wheel (10) for detecting a rotational speed of a rotatable component, in particular of a vehicle, wherein the sensor wheel (10) comprises: an opening (12) for attaching the sensor wheel (10) to the component, and a step (14) for centering the sensor wheel (10) on the component, wherein the step (14) is designed to deform when the sensor wheel (10) is fastened to the component, reducing the size of the opening (12), and to center the sensor wheel (10) on the component by reducing the size of the opening (12). [2] Sensor wheel (10) according to claim 1, wherein the step (14) limits the opening (12). [3] Sensor wheel (10) according to one of the preceding claims, wherein the sensor wheel (10) has a number of projections (32), wherein the projections (32) are designed to prevent rotation of the sensor wheel (10) relative to the component, wherein the number of projections (32) limits the opening (12). [4] Sensor wheel (10) according to one of the preceding claims, wherein the sensor wheel (10) has a number of interruptions (48) which divide the step (14) into step segments (50). [5] Sensor wheel (10) according to one of the preceding claims, wherein the step (14) has or is a chamfer, a bead, an embossment, a fold, a collar or a groove. [6] Sensor wheel (10) according to one of the preceding claims, wherein the sensor wheel (10) is a bent sheet metal part. [7] Arrangement (100) for a differential gear (200) of a vehicle, the arrangement comprising: a sensor wheel (10) according to one of the preceding claims, a differential cage (38) for receiving at least one planetary gear of the differential gear (200), and a differential bearing (40) for receiving at least a portion of the differential carrier (38), wherein the sensor wheel (10) is fastened to the differential carrier (38) by means of the differential bearing (40). [8] Arrangement (100) according to claim 7, wherein the differential bearing (40) is designed to act on the sensor wheel (10) when receiving the at least one section of the differential carrier (38) in such a way that the step (14) deforms while reducing the opening (12) and centers the sensor wheel (10) on the component by reducing the opening (12). [9] Differential gear (200) comprising an arrangement (100) according to claim 7 or 8. [10] Vehicle, in particular motor vehicle, comprising a differential gear (200) according to claim 9.

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