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EP-4739458-A1 - SYSTEM COMPRISING A SCREW DEVICE, A NUT, AND A SCREW PART THAT HAS A THREADED REGION

EP4739458A1EP 4739458 A1EP4739458 A1EP 4739458A1EP-4739458-A1

Abstract

The invention relates to a system comprising a screw device, a nut, and a screw part that has a threaded region, wherein the screw device has a housing part in which an output gearing part is rotatably mounted, wherein the output gearing part has an internal polygonal recess in which the nut is accommodated and frictionally held by means of a spring ring, wherein the spring ring has an annular base region from which spring arms axially project, wherein axial grooves, into which the spring arms of the spring ring project, are machined into the sides, in particular the side surfaces, of the internal polygonal recess of the output gearing part.

Inventors

  • NAGEL, GERD

Assignees

  • Sew-Eurodrive GmbH & Co. KG

Dates

Publication Date
20260513
Application Date
20240605

Claims (15)

  1. 1. System, in particular screw system, with screw device, nut and a screw part having a threaded area, in particular a threaded pin or bolt, wherein the screw device has a housing part in which a driven toothed part is arranged in a rotatable manner, characterized in that the driven toothed part has an inner polygonal recess, in particular an internal hexagon-shaped recess, in which the nut is received and held in a force-fitting manner by means of a spring ring, wherein the spring ring has an annular base area from which spring clips protrude axially, in particular wherein the ring axis of the spring ring is aligned parallel to the axial direction, wherein in particular two sides, in particular side surfaces, of the inner polygonal recess of the driven toothed part, axial grooves are worked into the driven toothed part, into which the spring clips of the spring ring protrude, in particular wherein the nut is received in a form-fitting manner in the peripheral direction in relation to the axis of rotation of the driven toothed part, in particular wherein the radial direction, the axial direction and/or the circumferential direction, is related to the axis of rotation of the output gear part.
  2. 2. Screwing device according to claim 1, characterized in that the spring clips are each supported on the groove bottom of the respective axial groove and press elastically tensioned onto the nut, and/or that the spring clips are elastically tensioned and are arranged radially between the driven toothed part and the nut.
  3. 3. Screwing device according to one of the preceding claims, characterized in that the respective spring clip is bent in such a way that with increasing axial distance from the base region, the radial distance of the spring clip relative to the axis of rotation of the driven toothed part initially increases monotonically until a maximum value is reached and then decreases monotonically.
  4. 4. Screw device according to one of the preceding claims, characterized in that the spring ring is clip-connected to the driven toothed part.
  5. 5. Screw device according to one of the preceding claims, characterized in that on the spring ring, in particular on the annular base region of the spring ring, radially outwardly extending regions protrude, which protrude into recesses of the driven toothing part, which are made on an end face of the driven toothing part and are directed in the axial direction, in particular wherein the regions are spaced apart from one another in the circumferential direction and/or are arranged radially, in particular wherein the regions all cover the same radial distance range.
  6. 6. Screw device according to one of the preceding claims, characterized in that the axial end region of the respective spring clip facing away from the base region engages behind the driven toothed part, in particular the front side of the driven toothed part spaced apart from the base region, in particular wherein the driven toothed part is designed as a spur gear, in particular wherein the spring ring together with the spring clip with end region and the regions (151) projecting into recesses in the front side are designed in one piece and/or in one part, in particular as a stamped and bent part made of sheet metal. in particular wherein the respective end region on the respective spring clip is bent in a radial direction.
  7. 7. Screw device according to one of the preceding claims, characterized in that the inner polygonal recess is a hexagon socket and the nut has an outer hexagon area.
  8. 8. Screwing device according to one of the preceding claims, characterized in that the nut is made of a ferromagnetic material, in particular steel, and/or that the nut has a collar region projecting radially towards the external hexagon region, in particular for axially limiting the nut, in particular wherein the collar region adjoins the external hexagon region, in particular wherein the axial direction is related to the axis of rotation of the driven toothed part.
  9. 9. Screwing device according to one of the preceding claims, characterized in that the output gear part can be driven by a driving gear part via further gear wheels that mesh with one another, wherein the gear wheels and the driving gear part are arranged so as to be rotatably mounted in the screwing device, wherein the driving gear part can be driven by an electric motor of the screwing device, or that the output gear part can be driven by a toothed belt that can be driven by a driving gear part that is rotatably mounted in the screwing device.
  10. 10. Screwing device according to one of the preceding claims, characterized in that the system has a robot arm by which the screwing device is held.
  11. 11. Screw device according to one of the preceding claims, characterized in that the inner polygonal recess is formed continuously through the driven toothed part and/or through the screw device or that the inner polygonal recess is enclosed by a recess that extends through the screw device.
  12. 12. Screwing device according to one of the preceding claims, characterized in that Side surfaces of the inner polygonal recess, on which no axial grooves are eroded, rest against the outer surfaces of the nut, in particular touchingly.
  13. 13. Screwing device according to one of the preceding claims, characterized in that the screwing device has a movably arranged slider which has a locking tab, wherein the locking tab is arranged in a first position of the slider in the direction of gravity below the nut, in particular so that the nut is delimited in the direction of gravity by the locking tab, and the locking tab does not delimit the nut in a second position of the slider, in particular so that the vertical projection of the nut in the direction of gravity in a plane whose normal direction is aligned parallel to the direction of gravity is spaced from the vertical projection of the locking tab and/or the slider in this plane.
  14. 14. Screwing device according to one of the preceding claims, characterized in that the slide can be driven by a linear actuator, in particular a pneumatic drive, of the screwing device, in particular can be moved linearly and/or back and forth, in particular wherein the linear actuator, in particular a pneumatic drive, is fastened to the housing part and/or is supported.
  15. 15. Screw device according to one of the preceding claims, characterized in that the slide is arranged to be linearly movable, wherein a linear guide is formed or attached to the housing part, which guides the slide linearly, and/or that a slide bracket is connected to the housing part, wherein the slide is connected by means of slide side parts to a slide block on which the linear actuator, in particular a plunger of the linear actuator, is supported, in particular wherein the slide block has a cylindrical projection which is guided in an elongated hole in the slide bracket, and/or that the slide bracket has a non-circular recess into which a correspondingly shaped elevation protrudes, in particular to achieve a play-free and precisely fitting connection between the slide bracket and the slide device, and/or that the slide is arranged to be rotatable relative to the housing part, wherein a rotary joint for the slide is formed or attached to the housing part, and/or that the slider is screwed and/or pinned to the slider side parts and/or the slider block is screwed and/or pinned to the slider side parts, and/or that the slider has the locking tab and two lateral guide tabs which rest on the housing part and in particular limit and thus guide the slider in the transverse direction to the linear movement, in particular wherein the guide tabs on the locking tab are bent at a vertical bending angle, and/or that the slider bracket is designed as a flat stamped sheet metal part, and/or that the linear actuator is fastened to the slider bracket.

Description

System with screw device, nut and a screw part with a threaded area Description: The invention relates to a system with a screw device, a nut and a screw part having a threaded area. It is well known that a nut can be screwed onto a threaded area using a tool. An automatic screwing device for screwing cases with limited accessibility is known from DD 2 59 168 A1. A polygon socket wrench is known from DE 83 09462 U1. From DD 1 44222 A1 a device for providing and positioning screw elements is known. The invention is therefore based on the object of further developing an automated, safe unscrewing process. According to the invention, the object is achieved in the system according to the features specified in claim 1. Important features of the invention in the system with screw device, nut and a screw part having a threaded area, in particular a threaded pin or bolt, are that the screw device has a housing part in which a driven toothed part is rotatably mounted, wherein the driven toothed part has an internal polygonal recess, in particular an internal hexagon-shaped recess, in which the nut is received and held in a force-fitting manner by means of a spring ring, wherein the spring ring has an annular base region from which spring clips protrude axially, in particular wherein the ring axis of the spring ring is aligned parallel to the axial direction, wherein in particular two sides, in particular side surfaces, of the inner polygonal recess of the output gear part, at least two axial grooves are worked into the output gear part, into which the spring clips of the spring ring protrude, in particular wherein the nut is received in the output gear part in a form-fitting manner in the circumferential direction relative to the axis of rotation of the output gear part, in particular wherein the radial direction, the axial direction and/or the circumferential direction is related to the axis of rotation of the output gear part. The advantage here is that the nut is held in place with a force fit and is therefore held securely in the driven gear part of the screw device for all spatial orientations of the screw device. A slider can also be used optionally for additional security. In an advantageous design, the spring clips are each supported on the groove base of the respective axial groove and press elastically against the nut. The advantage here is that each spring clip exerts spring force on the nut and, if the spring clips are arranged symmetrically around the circumference, the nut can be held centrally in a force-locking manner. In an advantageous embodiment, the spring clips are elastically tensioned and arranged radially between the driven gear part and the nut. The advantage here is that the nut is held in the driven gear part in a force-fitting manner and is nevertheless received in the driven gear part in a form-fitting manner in the circumferential direction. The spring clips can even be used to reduce or prevent the play that occurs in the circumferential direction. In an advantageous embodiment, the respective spring clip is bent in such a way that with increasing axial distance from the base area, the radial distance of the spring clip relative to the axis of rotation of the driven gear part initially increases monotonically until a maximum value is reached and then decreases monotonically. The advantage here is that the spring clips lie flat and thus only a low Hertzian pressure can be achieved. In an advantageous embodiment, the spring ring is clip-connected to the driven gear part. The advantage here is that a secure, positive connection can be provided in the axial direction. In an advantageous embodiment, radially outwardly extending regions protrude from the spring ring, in particular from the ring-shaped base region of the spring ring, which protrude into recesses of the driven gear part that are made on an end face of the driven gear part and are directed in the axial direction, in particular wherein the regions are spaced apart from one another in the circumferential direction and/or are arranged in a radial manner, in particular wherein the regions all cover the same radial distance region. The advantage here is that the radially protruding regions delimit the spring ring in the axial direction, with the end regions of the spring clips delimiting the spring ring in the opposite direction to the axial direction. The advantage here is that an axial limitation for the spring ring can be achieved by means of the radially protruding regions. The spring ring can thus be prevented from slipping into the driven gear part. In an advantageous embodiment, the axial end region of the respective spring clip facing away from the base region engages behind the driven toothed part, in particular the front side of the driven toothed part spaced apart from the base region, in each case, in particular wherein the driven toothed part is designed as a spur gear, in particular, the spring ring together with th