Oscillatory Driving Device

• US 20170151658A1
• Filed: 06/05/2015
• Published: 06/01/2017
• Est. Priority Date: 07/02/2014
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Reutlinger, Kurt, Luescher, Bruno
• Granted Patent: US 10,639,780 B2
• Time in Patent Office: Days
• CPC Class Codes: B24B 23/04 with oscillating grinding tools; Accessories therefor
• CPC Class Codes: B24B 27/08 being portable
• CPC Class Codes: B24B 47/12 by mechanical gearing or electric power B24B47/16 takes precedence
• CPC Class Codes: B24B 47/16 performing a reciprocating movement, e.g. during which the sense of rotation of the working-spindle is reversed
• CPC Class Codes: B25F 5/001 Gearings, speed selectors, clutches or the like specially adapted for rotary tools
• CPC Class Codes: B25F 5/006 Vibration damping means
• CPC Class Codes: B27B 19/006 with oscillating saw blades; Hand saws with oscillating saw blades
• CPC Class Codes: F16F 15/22 Compensation of inertia forces suppression of vibrations of rotating systems by favourable grouping or relative arrangements of the moving members of the system or systems F16F15/20, counterweights F16F15/28; correcting-weights for balancing rotating bodies F16F15/32
• CPC Class Codes: F16H 21/40 for interconverting rotary motion and oscillating motion
• CPC Class Codes: F16H 25/16 for interconverting rotary motion and oscillating motion

Abstract

An oscillatory driving device for a hand-held power tool includes at least one input shaft, at least one output shaft, and at least one gearing unit. The gearing unit operatively connects the input shaft to the output shaft and includes at least one eccentric element configured to drive the output shaft in an oscillatory manner. The gearing unit includes at least one further eccentric element configured to drive the output shaft in an oscillatory manner.

Claims

1. An oscillatory driving device for a hand-held power tool, comprising:

at least one input shaft;

at least one output shaft; and

at least one gearbox unit oeratively connecting the input shaft to the output shaft, the gearbox unit including;

at least one eccentric element configured to drive the output shaft in an oscillatory manner, and

at least one further eccentric element configured to drive the output shaft in an oscillatory manner.

2. The oscillatory driving device as claimed in claim 1, wherein the eccentric elements are disposed on opposite sides of an imaginary plane in which a rotation axis of the output shaft lies, and which together with a rotation axis of the input shaft encloses a minimum angle of at least 70°

.

3. The oscillatory driving device as claimed in claim 1, wherein:

a first of the eccentric elements is disposed on the input shaft along the rotation axis of the input shaft so as to be ahead of an intersection point of the rotation axes of the input shaft and of the output shaft, and

a second of the eccentric elements is disposed on the input shaft along the rotation axis of the input shaft so as to be behind an intersection point of the rotation axes of the input shaft and of the output shaft.

4. The oscillatory driving device as claimed in claim 1, wherein the gearbox unit has at least one motion convertor that operatively connects the eccentric elements to the output shaft.

5. The oscillatory driving device as claimed in claim 4, wherein the at least one motion convertor has at least a first connection element that bears on the first eccentric element, and at least one second connection element that bears on the second eccentric element.

6. The oscillatory driving device as claimed in claim 1, wherein the output shaft on a side that faces the input shaft is mounted in a floating manner.

7. The oscillatory driving device as claimed in claim 1, wherein the output shaft has at least one clearance through which the input shaft extends.

8. The oscillatory driving device as claimed in claim 4, further comprising at least one bearing element configured to mount the output shaft, the bearing element disposed between a region connecting the output shaft and the motion convertor, and the input shaft.

9. The oscillatory driving device as claimed in claim 1, wherein the output shaft is composed of at least two part-shafts that are disposed so as to be mutually spaced apart, and wherein the input shaft extends through a gap between the first part-shaft and the second part-shaft.

10. The oscillatory driving device as claimed in claim 1, further comprising a vibration balancing unit that has at least one balancing mass, the balancing mass driven counter to a movement direction of the output shaft so as to balance a vibration in at least one operating state.

11. The oscillatory driving device as claimed in claim 10, wherein the gearbox unit comprises at least one further eccentric element configured to drive the balancing mass in an oscillatory manner.

12. The oscillatory driving device as claimed in claim 11, wherein the further eccentric element configured to drive the balancing mass in an oscillatory manner has a maximum rotation radius that is larger than a maximum rotation radius of the eccentric elements configured to drive the output shaft in an oscillatory manner.

13. A hand-held power tool, comprising:

a spindle that is drivable in an oscillatory manner; and

at least one oscillatory driving device including;

at least one input shaft,

at least one output shaft, and

at least one gearbox unit operatively connecting the input shaft to the output shaft, the gearbox unit including;

at least one eccentric element configured to drive the output shaft in an oscillatory manner, and

at least one further eccentric element configured to drive the output shaft in an oscillatory manner.