Oscillatory driving device

• US 10,639,780 B2
• Filed: 06/05/2015
• Issued: 05/05/2020
• Est. Priority Date: 07/02/2014
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Luescher, Bruno, Reutlinger, Kurt
• Primary Examiner(s): Valvis, Alex M
• Assistant Examiner(s): Leeds, Daniel Jeremy
• Application Number:
  US15/323,412
• Publication Number:
  US 20170151658A1
• Time in Patent Office: 1,796 Days
• Field of Search: 74 25, 74 22 A, 74 24, 74 26, 74 33, 74 41, 74 55, 74 6
• 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:

an input shaft defining an input shaft rotation axis;

an output shaft defining an output shaft rotation axis, the output shaft rotation axis and the input shaft rotation axis intersecting at an intersection point such that the input shaft includes a first portion on a first side of the intersection point and a second portion on a second opposite side of the intersection point; and

a gearbox unit operatively connecting the input shaft to the output shaft, the gearbox unit including;

a first eccentric element entirely disposed on the first side of the intersection point and configured to drive the output shaft in an oscillatory manner;

a second eccentric element entirely disposed on the second side of the intersection point and configured to drive the output shaft in an oscillatory manner; and

a motion convertor that operatively connects the first eccentric element and the second eccentric element to the output shaft, the motion convertor having a first connection element configured to contact the first eccentric element such that the first connection element receives only one component of a non-circular movement of the first eccentric element in a force input direction that lies perpendicular to both the input shaft rotation axis and the output shaft rotation axis.

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

the output shaft rotation axis is coplanar with an imaginary plane;

the first eccentric element and the second eccentric element are completely disposed on opposite sides of the imaginary plane; and

the output shaft rotation axis and the input shaft rotation axis define a minimum angle of at least 70°

.

3. The oscillatory driving device as claimed in claim 1, wherein the motion convertor has a second connection element configured to contact the second eccentric element such that the second connection element receives only one component of a non-circular movement of the second eccentric element in the force input direction.

4. 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.

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

6. The oscillatory driving device as claimed in claim 1, 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.

7. 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.

8. The oscillatory driving device as claimed in claim 1, wherein the motion convertor defines an annular fastener that is fixedly connected to the output shaft, the first connection element configured as an arm that protrudes from the annular fastener.

9. The oscillatory driving device as claimed in claim 1, wherein the first connection element has two first appendices that extend in spaced relation therefrom, the two first appendices, when viewed parallel with the input shaft rotation axis, are disposed on opposite sides of the first eccentric element so as to be in a plane perpendicular to the output shaft rotation axis.

10. The oscillatory driving device as claimed in claim 3, wherein the motion convertor defines an annular fastener that is fixedly connected to the output shaft, the first connection element configured as a first arm that protrudes from the annular fastener, the second connection element configured as a second arm that protrudes from the annular fastener.

11. The oscillatory driving device as claimed in claim 10, wherein the first and second arms protrude from opposite sides of the annular fastener.

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

the first connection element has two first appendices that extend in spaced relation therefrom, the two first appendices, when viewed parallel with the input shaft rotation axis, are disposed on opposite sides of the first eccentric element so as to be in a plane perpendicular to the output shaft rotation axis, and

the second connection element has two second appendices that extend in spaced relation therefrom, the two second appendices, when viewed parallel with the input shaft rotation axis, are disposed on opposite sides of the second eccentric element so as to be in the plane.

13. A hand-held power tool, comprising:

a spindle that is drivable in an oscillatory manner; and

an oscillatory driving device including;

an input shaft defining an input shaft rotation axis;

an output shaft defining an output shaft rotation axis, the output shaft rotation axis and the input shaft rotation axis intersecting at an intersection point such that the input shaft includes a first portion on a first side of the intersection point and a second portion on a second opposite side of the intersection point; and

a gearbox unit operatively connecting the input shaft to the output shaft, the gearbox unit including;

a first eccentric element entirely disposed on the first side of the intersection point and configured to drive the output shaft in an oscillatory manner;

a second eccentric element entirely disposed on the second side of the intersection point and configured to drive the output shaft in an oscillatory manner; and

a motion convertor that operatively connects the first eccentric element and the second eccentric element to the output shaft, the motion convertor having a first connection element configured to contact the first eccentric element such that the first connection element receives only one component of a non-circular movement of the first eccentric element in a force input direction that lies perpendicular to both the input shaft rotation axis and the output shaft rotation axis.