Hand-held power tool with a three-point mounting

Patent metadata

Field	Value
Publication number	US-9314912-B2
Application number	US-201213558066-A
Country	US
Kind code	B2
Filing date	Jul 25, 2012
Priority date	Jul 26, 2011
Publication date	Apr 19, 2016
Grant date	Apr 19, 2016

Abstract

A hand-held power tool is disclosed. The power tool has a linear motor with a rotor, an exciter piston that is coupled mechanically to the rotor, and a bearing device with a rotor mounting to support the longitudinal movement of the rotor and an exciter piston mounting to support the exciter piston. The rotor mounting and the exciter piston mounting form a three-point mounting, which is the sole bearing for the rotor and the exciter piston.

First claim

What is claimed is:

1. A hand-held power tool, comprising:
a linear motor with a rotor;
an exciter piston mechanically coupled to the rotor; and
a bearing device with a rotor mounting, wherein a longitudinal movement of the rotor is supportable by the rotor mounting, and an exciter piston mounting, wherein a longitudinal movement of the exciter piston is supportable by the exciter piston mounting;
wherein the rotor mounting has a first bearing and a second bearing, wherein the rotor is supported on opposing sides by the first bearing and the second bearing, and wherein the rotor mounting enables a swiveling of the rotor together with the exciter piston around an axis lying transverse to an axis of motion of a tool of the hand-held power tool;
wherein the exciter piston mounting has a third bearing with a longitudinal guide along the axis of motion;
and wherein the first bearing and the second bearing each include a first bearing part and a second bearing part, wherein the first bearing part is a spherical body and the second bearing part is a calotte, and wherein the first bearing part engages the second bearing part such that the first bearing part has limited mobility.

2. The hand-held power tool according to claim 1 , wherein the first bearing and the second bearing each include a spring, and wherein the spring presses the calotte against the spherical body.

3. A hand-held power tool, comprising:
a linear motor with a rotor;
an exciter piston mechanically coupled to the rotor; and
a bearing device with a rotor mounting, wherein a longitudinal movement of the rotor is supportable by the rotor mounting, and an exciter piston mounting, wherein a longitudinal movement of the exciter piston is supportable by the exciter piston mounting;
wherein the rotor mounting has a first bearing and a second bearing, wherein the rotor is supported on opposing sides by the first bearing and the second bearing, and wherein the rotor mounting enables a swiveling of the rotor together with the exciter piston around an axis lying transverse to an axis of motion of a tool of the hand-held power tool;
wherein the exciter piston mounting has a third bearing with a longitudinal guide along the axis of motion;
and wherein the first bearing and the second bearing each include a spherical body, wherein the respective spherical bodies have a groove, and wherein the rotor engages in the respective grooves.

4. The hand-held power tool according to claim 3 , wherein the first bearing and the second bearing are separate components from a stator of the linear motor.

5. The hand-held power tool according to claim 3 , wherein the rotor mounting and the exciter piston mounting mount the rotor and the exciter piston at three mounting points via the first bearing, the second bearing, and the third bearing.

6. The hand-held power tool according to claim 3 , wherein the rotor and the exciter piston are supported solely by the first bearing, the second bearing, and the third bearing.

7. The hand-held power tool according to claim 3 , wherein two opposing bearing points of a three-point mounting are provided by the first bearing and the second bearing for the rotor, and a third bearing point of the three-point mounting is provided by the third bearing for the exciter piston.

8. The hand-held power tool according to claim 3 , wherein the third bearing has a hollow cylinder aligned along the axis of motion, wherein the exciter piston is supportable in the hollow space for longitudinal movement, and wherein a cylinder jacket surface of the exciter piston is guidable in an air-tight manner on an inner side of the hollow cylinder.

9. The hand-held power tool according to claim 8 , wherein a sealing ring is disposed in the cylinder jacket surface.

10. A hand-held power tool, comprising:
a linear motor with a rotor;
an exciter piston mechanically coupled to the rotor: and
a bearing device with a rotor mounting, wherein a longitudinal movement of the rotor is supportable by the rotor mounting, and an exciter piston mounting, wherein a longitudinal movement of the exciter piston is supportable by the exciter piston mounting;
wherein the rotor mounting has a first bearing and a second bearing, wherein the rotor is supported on opposing sides by the first bearing and the second bearing, and wherein the rotor mounting enables a swiveling of the rotor together with the exciter piston around an axis lying transverse to an axis of motion of a tool of the hand-held power tool;
wherein the exciter piston mounting has a third bearing with a longitudinal guide along the axis of motion;
and wherein the first bearing and the second bearing each include a calotte, wherein the respective calottes each have a recess, and wherein a protrusion of the first bearing and a protrusion of the second bearing are disposed within the respective recesses.

11. The hand-held power tool according to claim 10 , wherein the recesses are larger than the protrusions.

12. A hand-held power tool, comprising:
a linear motor with a rotor;
an exciter piston mechanically coupled to the rotor; and
a bearing device with a rotor mounting, wherein a longitudinal movement of the rotor is supportable by the rotor mounting, and an exciter piston mounting, wherein a longitudinal movement of the exciter piston is supportable by the exciter piston mounting;
wherein the rotor mounting has a first bearing and a second bearing, wherein the rotor is supported on opposing sides by the first bearing and the second bearing, and wherein the rotor mounting enables a swiveling of the rotor together with the exciter piston around an axis lying transverse to an axis of motion of a tool of the hand-held power tool;
wherein the exciter piston mounting has a third bearing with a longitudinal guide along the axis of motion;
and wherein the first bearing and the second bearing each include a spherical body, a first calotte, and a second calotte, wherein the first calotte and the second calotte are disposed on opposing ends of the respective first bearing and the second bearing.

13. The hand-held power tool according to claim 12 , wherein the respective spherical bodies have a groove and wherein the rotor engages in the grooves.

Assignees

• Binder Albert
• Clark Richard
• Duggan Sarah
• Sander Bernhard
• Hilti Ag

Inventors

• Binder Albert
• Clark Richard
• Duggan Sarah
• Sander Bernhard

Classifications

• H02K33/16

  with polarised armatures moving in alternate directions by reversal or energisation of a single coil system · CPC title

• H02K7/08

  Structural association with bearings · CPC title

• B25D2250/245

  Spatial arrangement of components of the tool relative to each other · CPC title

• B25D17/28

  Supports; Devices for holding power-driven percussive tools in working position {(connections of hammers to backhoes E02F3/966)} · CPC title

• B25D11/064 Primary

  using an electromagnetic drive · CPC title