Drive Device

• US 20100186528A1
• Filed: 12/01/2009
• Published: 07/29/2010
• Est. Priority Date: 01/28/2009
• Status: Active Grant

• Current Assignee: Stabilus GmbH (Stabilus S.A.)
• Original Assignee: Stabilus GmbH (Stabilus S.A.)
• Inventors: Hillen, Jörg, Ritter, Andreas
• Granted Patent: US 8,375,814 B2
• Time in Patent Office: Days
• US Class Current: 74/89.230
• CPC Class Codes: E05F 15/622 using screw-and-nut mechanisms
• CPC Class Codes: E05Y 2201/216 Clutches
• CPC Class Codes: E05Y 2201/25 Mechanical means for force or torque adjustment therefor
• CPC Class Codes: E05Y 2800/232 of motors and transmissions
• CPC Class Codes: E05Y 2800/238 of springs and transmissions
• CPC Class Codes: E05Y 2900/546 Tailboards, tailgates or sideboards opening upwards
• CPC Class Codes: F16D 7/044 the axially moving part being coaxial with the rotation, e.g. a gear with face teeth
• CPC Class Codes: F16D 7/048 with parts moving radially between engagement and disengagement F16D7/10 takes precedence
• CPC Class Codes: F16H 2025/2075 Coaxial drive motors
• CPC Class Codes: F16H 25/2021 with means for avoiding overloading
• CPC Class Codes: Y10T 74/18576 including screw and nut
• CPC Class Codes: Y10T 74/18696 including means to selectively transmit power [e.g., clutch, etc.]

Abstract

A drive device includes a first fastening device (5), for connection to a stationary base part, especially a vehicle body, or to a movable part, especially a vehicle (hinged) lid or door; a second fastening device (24), for connection to the movable part or to the stationary base part; a spindle drive (17), which includes a threaded spindle (16) and a spindle nut (19) mounted on the threaded spindle (16) and capable of moving the first and the second fastening devices (5, 24) axially relative to each other; and a rotary drive (9), which rotates the spindle drive (17) by way of an overload safety device, wherein the nonrotatable connection between the two components can be released when a certain torque is exceeded, and wherein the overload safety device is formed by a clutch device (15), which comprises an inner part (32) connected to the rotary drive (9), which inner part rotates an intermediate part (34) by way of a damping element (33) and, by way of the intermediate part (34), rotates an outer part (36) connected to the spindle drive (17).

Claims

1. A drive device comprising:

a first fastening device (15) connectable to one of a stationary base part and to a movable part;

a second fastening device (24) connectable to one of the movable part and to the stationary base part;

a spindle drive (17) comprising a threaded spindle (16) and a spindle nut (19) mounted on said threaded spindle (16) for moving said first and the second fastening devices (15, 24) axially relative to each other; and

a rotary drive (9) for rotating said spindle drive (17) by way of an overload safety device including a nonrotatable connection between two components which can be released when a predetermined torque is exceeded;

said overload safety device being formed by a clutch device (15) comprising an inner part (32);

a damping element (33);

an intermediate part (34) and an outer part 36;

said inner part (32) connected to said rotary drive (9), said inner part rotating said intermediate part (34) by way of said damping element (33) and, by way of said intermediate part (34), rotating said outer part (36) connected to said spindle drive (17).

2. The drive device according to claim 1, wherein said inner part (32) cooperates with said damping element (33) and said intermediate part (34) to form an elastic claw-type clutch.

3. The drive device according to claim 1, wherein said inner part (32) comprises radially outward-pointing projections (37) on its outer lateral surface, and said intermediate part (34) comprises an equal number of radially inward-pointing projections (38).

4. The drive device according to claim 3, wherein said projections (37) of said inner part (32) and said projections (38) of said outer part (34) are offset from each other and are not touching each other.

5. The drive device according to claim 1, additionally comprising a spring ring (35) for connecting said intermediate part (34) to said outer part (36), said spring ring (35) being held in place on said outer part (36) in axial and radial direction.

6. The drive device according to claim 5, wherein said outer part (36) comprises recesses (40);

and said spring ring (35) comprises several fingers (39) extending axially into an equal number of said recesses (40) formed in said outer part (36).

7. The drive device according to claim 6, additionally comprising projections (42) formed in said recesses (40) of said outer part (36);

and wherein each of said fingers (39) comprises a through-opening (41) for engaging said projections (42) formed in said recesses (40) of said outer part (36).

8. The drive device according to claim 6, wherein some of said fingers (39) pass completely through said openings (40), and wherein the ends of said fingers (39) are bent over radially toward the outside and latch with said outer part (36) at the ends of said openings (40).

9. The drive device according to claim 5, additionally comprising radially circumferential grooves (44) on the outside lateral surface of said intermediate part (34);

and wherein said spring ring (35) comprises spring arms (43) radially arranged for connecting said intermediate part (34) by engaging in said radially circumferential grooves said grooves (44) being directly adjacent to each other.

10. The drive device according to claim 9, wherein said spring arms (43) include free ends and at said free ends two claw-like, radially inward-pointing projections which engage in said grooves (44).

11. The drive device according to claim 1, additionally comprising a spring ring (35) including spring arms (43);

and grooves formed on the inside lateral surface of said outer part (36); and

wherein said spring ring (35) is permanently and nonrotatably connected to said intermediate part (34), and said spring ring (35) is connected to said outer part (36) by way of said spring arms (43).

12. The drive device according to claim 5, wherein said spring ruing (35) additionally comprises fingers (39) having through-openings (41) therein;

and comprising projections (42) arranged on the outside surface of said outer part (36) and for holding said spring ring (35) in place;

said projections (42) projecting into said through-openings (41) formed in said fingers (39) of said spring ring (35) when said ring is pushed onto the end of said outer part (36) which faces a connecting element (45);

said fingers (39) extending axially over said outer part (36).

13. The drive device according to claim 12, additionally comprising grooves (44) formed on said intermediate part (34);

and wherein said spring ring (45) comprises several spring arms (43) extending axially from said spring ring (35) over said outer part (36), said arms being bent over at their ends radially toward the inside and tapering down toward their outer ends, and wherein the ends of said spring arms (43) engage in at least some of said grooves (44) formed on said intermediate part (34).

14. The drive device according to claim 13, wherein a part of said intermediate part (34) is accommodated rotatably in said outer part (36);

said grooves (44) being arranged axially outside said outer part (36).

15. The drive device according to claim 5, wherein said spring ring (35) has through-openings (41) and additionally comprising a connecting element (45) and projections (42) in said outer part (36) at the transition to said connecting element (45);

said projections (42) projecting into said through-openings (41) of said spring ring (35) when said ring is pushed onto the end of said outer part (36) which faces said connecting element (45).

16. The drive device according to claim 4, additionally comprising a support disk (54) and wherein said outer part (36) comprises, at the end facing said rotary drive (9), a retaining device (52) forming a shoulder (53) against which said support disk (54) comes to rest.

17. The drive device according to claim 16, wherein said retaining device (52) comprises one of a spring ring, inserted into a groove and designed as a flanged-over section and several fingers, the free ends of which are bend over radially toward the inside and secure said support disk (54) on said outer part (36).

18. The drive device according to claim 16, wherein said outer part (36) has an inside diameter;

and additionally comprising a slip ring (55) resting inside said outer part (36) on said support disk (54) and having an outside diameter not greater than said inside diameter of said outer part (36).

19. The drive device according to claim 18, wherein said intermediate part (34) comes to rest against said slip ring (55).

20. The drive device according to claims 17, wherein said damping element (33) is arranged between said inner part (32) and said intermediate part (34) and extends at least partially between said support disk (54) and said intermediate part (34) without touching said support disk (54).

21. The drive device according to one of claims 17, additionally comprising a slip ring (55);

and wherein said damping element (33) is supported in the axial direction against said slip ring (55).

22. The drive device according to claim 17, wherein said intermediate part (36) includes end surfaces;

and additionally comprising a slider (56) having end surfaces facing said end surfaces of said intermediate part (36);

said slider resting on said the intermediate part (34); and

wherein said facing end surfaces of said intermediate part (36) and said slider (56) are provided with corresponding serrations (57) and (58).

23. The drive device according to claim 22, wherein said slider (56) comprises recesses (59);

said inside surface of said outer part (36) comprises guide webs (60) for engaging said recesses (59); and

additionally comprising a spring element (61) for pushing said slider (56) against said intermediate part (34) and said serrations (58) of said slider against said serrations (58) of said intermediate part (36).

24. The drive device according to claim 1, additionally comprising a spindle bearing (31) for radially and axially supporting said clutch device (15) and further comprising a connecting device 45 on said outer part (36) for introducing said threaded spindle (16).

25. The drive device according to claim 1, additionally comprising a sensor device (48) including an internal gear (49) supported within said sensor device with the freedom to rotate and to wobble;

and further comprising a driver (50);

said internal gear (49) being driven by said outer part (36) of said clutch device (15) by said driver (50).