Harmonic drive with crowned drive ring

• US 6,786,112 B2
• Filed: 10/08/2002
• Issued: 09/07/2004
• Est. Priority Date: 02/08/2001
• Status: Expired due to Fees

• Current Assignee: Oechsler AG
• Original Assignee: Oechsler AG
• Inventors: Ruttor, Martin
• Primary Examiner(s): Marmor, Charles A.
• Assistant Examiner(s): ABDELNOUR, DENNIS J
• Application Number:
  US10/257,223
• Publication Number:
  US 20030075009A1
• Time in Patent Office: 700 Days
• Field of Search: 746/40, 746/06.R
• US Class Current: 74/640
• CPC Class Codes: F16H 49/001 Wave gearings, e.g. harmonic drive transmissions harmonic drives specially adapted for positioning programme-controlled manipulators B25J9/1025
• CPC Class Codes: F16H 57/033 Series gearboxes, e.g. gearboxes based on the same design being available in different sizes or gearboxes using a combination of several standardised units
• CPC Class Codes: Y10T 74/19 Gearing

Abstract

A shaft drive (10), which may be produced without problem and easily—even in a cascade—assembled, may be achieved, whereby the support ring (18) produced such as to be floating relative to the housing is rotationally fixed on the front side to a housing base plate (12) and enclosed by a housing cover (20), similarly fixed to the base plate (12), in which the drive shaft (25) for the crowned drive ring (27), which may rotate relative to the support ring (18), has a floating bearing. The inner wheel (28), extending through both rings is however not supported in the housing, but rather mounted on the drive shaft (14) extending coaxially into the housing (11) through the base plate (12), by means of the wave generator drive core (30), the base plate (12) being non-rotationally mounted in front of the bearing plate (32) of the above.

Claims

1. A harmonic drive (10) having a housing and a housing baseplate (12) with a central hole and having a generator drive core (30) in a revolvingly radially deformable internal geared wheel (28), which extends axially through a dimensionally stable support ring (18), which is fixed to the housing, into a cap-shaped, dimensionally stable driven ring (27) mounted using its driven shaft (25) in the housing (11), wherein the dimensionally stable support ring (18) is of somewhat greater internal diameter than a non-deformed internal geared wheel external diameter, and wherein the cap-shaped dimensionally stable driven ring (27) is of somewhat greater internal diameter than the non-deformed internal geared wheel external diameter, characterized in that a housing independent support ring is mounted on its face on the housing baseplate (12) and is overlapped by a housing cup (20), whose bottom (23) is equipped with a bearing (24) for the driven shaft (25) and whose front edge, opposite the bottom (23) is rigidly connected to the housing baseplate (12), wherein the housing baseplate (12) is equipped with a profiled edge region (16) for form-fitting accommodation of the support ring (18) and of the housing cup (20).

2. The harmonic drive according to one of claim 1, characterized in that the cap-shaped driven ring (27) is mounted in the housing cup (20) of the housing (11), against the internal geared wheel (20) including its drive core (30), on the drive shaft (14), which projects here unmounted through the housing baseplate (12) into the housing (11), on its end plate (32).

3. The harmonic drive according to one of claim 1, characterized in that the housing baseplate (12) is equipped on its free face with a coaxial groove (31) for centering engagement of a bearing socket (35) for the drive shaft (14).

4. The harmonic drive according to claim 1, characterized in that a driving end plate (32) is equipped with fastening means for the housing baseplate (12).

5. The harmonic drive according to claim 4, characterized in that the housing baseplate (12) is fastened in front of the driving end plate (32) using short clamping screws (33) parallel to the axis.

6. The harmonic drive according to claim 1, characterized in that an end plate (32) for a drive shaft (14) is equipped with threaded holes (34) to engage with clamping screws (33) to accommodate the housing baseplate (12).

7. The harmonic drive according to claim 1, characterized in that the bottom (23) of a drive housing cup (20) is used as an end plate (32) for the internal geared wheel (28) in a drive (10) positioned before it, whose housing baseplate (12) is mounted in front of its bottom (23).

8. The harmonic drive according to claim 1, characterized in that a driving end plate simultaneously assumes the function of the housing baseplate of a drive stage which follows it.

9. A harmonic drive (10) comprising

a housing (11);

a cap-shaped, dimensionally stable driven ring (27) mounted in the housing (11) and using a driven shaft (25);

a dimensionally stable support ring (18) disposed fixed to the housing (11);

a revolvingly radially deformable internal geared wheel (28) extending axially through the dimensionally stable support ring (18), wherein the dimensionally stable support ring (18) is of somewhat greater internal diameter than a non-deformed internal geared wheel external diameter;

a cap-shaped, dimensionally stable driven ring (27) mounted using its driven shaft (25) in the housing (11) and wherein the cap-shaped dimensionally stable driven ring (27) is of somewhat greater internal diameter than the non-deformed internal geared wheel external diameter;

a housing baseplate (12) having a central hole and having a generator drive core (30) disposed in the revolvingly radially deformable internal geared wheel (28), which revolvingly radially deformable internal geared wheel (28) extends axially into the cap-shaped, dimensionally stable driven ring (27);

a support ring independent of the housing (11) and having a front face is mounted with the front face on the housing baseplate (12);

a bearing (24) for the driven shaft (25);

a housing cup (20) having a bottom (23) equipped with the bearing (24) for the driven shaft (25) and having a front edge disposed opposite to the bottom (23) and rigidly connected to the housing baseplate (12), wherein the housing cup (20) overlaps the radially dimensionally stable support ring (18).

10. The harmonic drive according to claim 9, wherein the housing baseplate (12) is equipped with a profiled edge region (16) for form-fitting accommodation of the support ring (18) and of the housing cup (20).

11. The harmonic drive according claim 10, characterized in that the hollow-cylindrical wall (21) of the housing cup (20) is equipped with spring hooks (22) for engaging behind the housing baseplate (12).