Transducer device with form-fitting connection

Abstract

A transducer device for attachment to one end of a shaft of an electric drive, the shaft having a shaft axis. The transducer device includes at least one recess in the shaft end. Means are provided for engaging the transducer device with the at least one recess to create a form fitting connection acting in the direction of the shaft axis. Finally, a securing means is provided for preventing detachment of the form-fitting connection.

Claims

1. A transducer device for attachment to one end of an elongated shaft of an electric drive, the shaft having a longitudinal axis, the transducer device comprising: a recess defined at the shaft end to provide a first securing means; a support part mounted to the transducer device, and having a second securing means; the second securing means engaging the recess of the first securing means whereby a form-fitting connection acting at least in the direction of the shaft axis is formed; and a ball bearing securing the shaft to the support part about the engaged first and second securing means to prevent detachment of the form-fitting connection.

2. The transducer device according to claim 1, wherein the bearing has a cylindrical inner section; and wherein the support part has a cylindrical outer contour which corresponds at least approximately to an outer diameter of the shaft and extends at least partly into the cylindrical inner section of the bearing.

3. The transducer device according to claim 1, wherein the recess at the shaft end comprises: a first transverse groove oriented perpendicularly to the longitudinal axis of the shaft; and a rib remaining between the transverse groove and the shaft end opposite to an inner contour of the bearing.

4. The transducer device according to claim 3, wherein the shaft end has a second transverse groove perpendicular to the longitudinal axis of the shaft, the first and second transverse grooves being parallel to each other.

5. The transducer device according to claim 4, further comprising: snap hook means which engage in the groove or in the grooves, wherein the snap hook means are seemed from coming loose by the bearing.

6. The transducer device according to claim 3, wherein the second securing means has a counter-contour corresponding to the recess at the shaft end and is pushed onto the shaft end radially to the shaft axis, and wherein the bearing prevents a lateral deflection of the support part off the shaft.

7. The transducer device according to claim 1, further comprising a transducer part mounted to the support part, the support part entering into the form-fitting connection with the shaft.

8. The transducer device according to claim 7, wherein the transducer part is a plastic-bonded permanent magnet.

9. The transducer device according to claim 1, wherein the transducer part is mounted between the shaft end and a section of the support part.

10. The transducer device according to claim 1, wherein the transducer part is joined to the support part through primary shaping.

11. The transducer device according to claim 1, wherein the support part includes a sensor part that enters the form-fitting connection with the shaft.

12. The transducer device according to claim 1, wherein the shaft end has a polygonal grooved contour, wherein ribs remaining between the grooves and an adjacent shaft front end spring backwards with respect to an inner contour of the bearing and the space area thereby obtained is captured by the transducer device.

13. The transducer device according to claim 1, wherein the support part includes at least two part carriers and the transducer device further comprising: a film hinge which is integral with the at least two part carriers.

14. The transducer device according to claim 13, further comprising: securing means for securing the at least two part carriers in a mounted position.

15. The transducer device according to claim 1, further comprising: an anti-rotation lock between the support part and the transducer part.

16. The transducer device according to claim 1, further comprising: spacing means, for ensuring a distance between the transducer part and the shaft end of the shaft.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Embodiments of the invention are described with reference being made to the drawing. Shown are:

(2) FIG. 1 shows a first embodiment of a transducer device and a shaft,

(3) FIG. 2 is a sectional view of the first embodiment in an assembled state,

(4) FIG. 3 is a perspective representation of the first embodiment in assembled state,

(5) FIG. 4 is a variant of the transducer device of the first embodiment,

(6) FIG. 5 shows a valiant with a transverse magnetic pill,

(7) FIG. 6 is a further illustration of the transverse magnetic pill,

(8) FIG. 7 a second embodiment of the invention,

(9) FIG. 8 is a perspective view of the second embodiment in assembled state,

(10) FIG. 9 is a perspective view of a shaft for use in the second embodiment,

(11) FIG. 10 is a sectional view of the second embodiment,

(12) FIG. 11 is a second sectional view of the second embodiment,

(13) FIG. 12 is a third sectional view of the second embodiment, and

(14) FIG. 13 is a variant of the second embodiment.

(15) Numerals with an apostrophe and corresponding reference minerals without an apostrophe denote identically named details in the drawings and the description of the drawing. This indicates that the detail is used in another embodiment, the prior art and/or the detail is a variant. For the sake of convenience, the claims, the introductory description, the list of reference numerals and the summary contain only numerals without apostrophes.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

(16) In describing preferred embodiments of the present invention illustrated in the drawings, specific terminology is employed for the sake of clarity. However, the invention is not intended to be limited to the specific terminology so selected, and it is to be understood that each specific element includes all technical equivalents that operate in a similar manner to accomplish a similar purpose.

(17) FIG. 1 shows a first embodiment of the inventive transducer device 1 and a shaft 2, wherein shaft 2 has two parallel recesses 3, which are oriented perpendicularly to the shaft axis 9 of shaft 2. An area between the recesses 3 and the shaft end 17 forms ribs 7, which are flattened, so that space is available for the transducer device 1. The transducer device is adapted to the diameter of the shaft 2 and to the contour of the recesses 3 in which they can engage with complementary counter-contours 8. The transducer device comprises a transducer part 11 and a support part 10. The transducer part 11 comprises a two-pole permanent magnet. High pin transducer parts 11 are possible. The ribs 7 form anti-rotation locks with corresponding mating surfaces of the transducer device 1 relative to the shaft 2. The transducer device 1 can be pushed radially onto the shaft.

(18) FIG. 2 shows a sectional view of the first embodiment in an assembled state, with the transducer device 1, the shaft 2 and a bearing 4 herein formed as ball bearings. The transducer device 1 engages the recesses 3 via the counter-contours 8. The transducer device 1 cannot be disassembled from its side, because an inner region of the bearing 4 surrounds and includes the shaft 2 and the transducer device 1. The bearing 4 is press-fitted onto the shaft 2.

(19) FIG. 3 shows a 3-D representation of the first embodiment with the transducer device 1, the shaft 2 and the bearing 4 in an assembled state where the transducer device 1 is mounted on the shaft 2 and held in place by the bearing 4.

(20) FIG. 4 is a variant of the transducer device 1 of the first embodiment, wherein the counter-contours 8 are not continuously rib-shaped, but have cylinder segment-shaped recesses 18, these serving as a mounting opening for the transducer part 11, which is mounted from the inside (see arrow F) of the support plate 10.

(21) FIG. 5 shows a variant with a transverse magnetic pill (transducer part), which defines the outer contour of the transducer device 1. The basic form of the transducer part 11 is cylindrical and its axis is aligned at right angles with the longitudinal axis 9 of the shaft 2. In an assembled state, the transducer device 1, in particular the carrier part 10, is mounted on the counter-contours 8 on the shaft 2 and secured by the bearing 4.

(22) A further illustration of the transverse magnetic pill (transducer part 11) in the transducer device 1 is shown in FIG. 6. Additionally, the counter-contours 8 for the form-fitting connection with the shaft are clearly visible.

(23) FIG. 7 shows a second embodiment of the invention in which the support or carrier part 10 is comprised of two sub-carrier parts 14, which constitute a single piece with one another by being joined through a film hinge 12. An inner space 25 is cylindrically shaped to accommodate a cylindrical transducer part, the axial directions of the shaft and transducer part lying on the same straight line in this case. Near the shaft, the interior space is limited by a spacing structure 13. This creates a distance between the transducer part and the shaft end of the shaft 2. The counter-contours 8 are used to create a form-fitting engagement with the shaft. The carrier part 10 has extensions 19 at the outer circumference, which interact with the interior section of a bearing (See FIG. 12).

(24) FIG. 8 shows the second embodiment in assembled state, with a shaft 2, a recess 3 and a rib 7. The counter-contours 8 of the transducer device 1 engage in the recess 3 and are held axially by the rib 7.

(25) The sub-carriers 14 are held together by the film hinge 12 on the one hand and are secured through the inner section of a bearing on the other hand (see FIG. 10). Finally, a sensor 16 is shown from the front in its installed position frontally in relation to the transducer device 1.

(26) FIG. 9 shows the shaft 2 for use in the second embodiment, with the recess 3 and the ribs 7. Between the ribs 7 are flattened areas 20, which serve as a free space for the sub-carriers 14.

(27) FIG. 10 shows a sectional view of the second embodiment, with the shaft 2, the bearing 4, which is embodied here as a ball bearing, the transducer device 1, a transducer part 11 (shaded area), the spacing means 13, the film hinge 12, the flattened areas 20, the inner portion 6 of the bearing 4, which is formed as an axial section of the inner ring of the ball bearing, the extensions 19 and the sub-carrier means 14. Again, the sensor 16 is shown in its assembled position frontally in relation to the transducer device 1 on the axis 9 of the shaft 2.

(28) FIG. 11 shows a second sectional view of the second embodiment, wherein the section is aligned at right angles to the motor axis 9 and extends through the section of transducer device 11. The cross-section shows the anti-rotation locks 15, which are formed as projections in the sub-carriers 14 and as recesses in the transducer device 11, wherein projections engage in the recesses. Further, the bearing 4 is shown, which serves as a securing means.

(29) FIG. 12 shows a third sectional view of the second embodiment, the section also being aligned at a right angle to the motor axis, but extending here at the end region of the bearing 4. Clearly visible here are the extensions 19 of the sub-carrier means 14, which interact with the inner section 6 of the bearing 4.

(30) FIG. 13 shows a variant of the second embodiment of the invention, wherein the support member 10 comprises two sub-carrier means 14 and 14, which constitute a single piece with one another through a film binge 12. An inner section 25 is cylindrically shaped to accommodate a cylindrical transducer part, wherein the axial directions of the shaft 2 and transducer part lie on the same straight line in this case. Near the shaft, the interior section is limited by a spacing section 13. This causes a distance between the transducer part and the shaft end of the shaft. The counter-contours 8 are used to create a form-fitting engagement with the shaft in the axial direction. The carrier part 10 has extensions 19 on the outer circumference, which can interact with the interior region (not shown here) of a bearing (See FIG. 12). As in FIG. 7, a snap 21 is shown here that consists of a snap hook 22 and a snap lug 23 which are free of undercuts produced by injection molding. To this end, the snap lug 23 is famed at a slight angle in a known manner and adapted to the snap hook 22 accordingly.

(31) FIG. 13 also shows an example of a second solution of the invention, in which it is not necessary to use a bearing as a securing means, because the snap 21 ensures a sufficiently secure connection through the mating of the snap hook 22 and the snap lug 23.

(32) Modifications and variations of the above-described embodiments of the present invention are possible, as appreciated by those skilled in the art in light of the above teachings. It is therefore to be understood that, within the scope of the appended claims and their equivalents, the invention may be practiced otherwise than as specifically described.

LIST OF REFERENCE NUMERALS

(33) 1 transducer device 2 shaft 3 recess 4 bearing 5 outer contour 6 inner section 7 rib 8 counter-contour 9 shaft axis 10 support part 11 transducer device 12 film hinge 13 spacing means 14 part carrier means 15 anti-rotation lock 16 sensor 17 shaft end 18 recess 19 extension 20 flattened area 21 snap means 22 snap hook 23 snap lug 24 anti-rotation means 25 inner section