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US 7,256,520 B2Granted
Power tool with a self-supporting motor
AssigneeC. & E. Fein GmbH
InventorsSigmund Braun, Boris Rudolf
Life of this patent
Estimating the term…
Abstract
A power tool comprising an electric motor for driving a tool is disclosed. The electric motor comprises a shaft, an armature, and a brush collector. The stator is configured as a self-supporting unit comprising first and second supporting parts. One of the supporting parts may be configured as an air guide ring allowing air to be routed between a fan and the opposite end of the electric motor along the armature and the brushes.
Claims19
A power tool comprising:
- an electric motor for driving a tool, said electric motor comprising:
- first and second supporting parts, each of said first and second supporting parts having first and second longitudinal ends;
- a tool head attached to the first longitudinal end of said first supporting part;
- a self-supporting stator having a first longitudinal end facing said tool head and a second longitudinal end opposite to the first longitudinal end, the first longitudinal end of said stator being attached to the second longitudinal end of said first supporting part and the second longitudinal end of said stator being attached to the first longitudinal end of said second supporting part
- a motor shaft carrying an armature having a winding core;
- a commutator;
- brushes cooperating with said commutator;
- a fan driven by said motor shaft;
- and
- a housing which externally surrounds said stator and said first and second supporting parts, said housing being connected to at least one of said first and second supporting parts;
- wherein said commutator is arranged between said fan and said winding core of said armature;
- wherein said motor shaft is supported rotatably on said first supporting part, said second supporting part, and said tool head;
- wherein said first supporting part is arranged for routing air between said fan and an opposite end of said electric motor along said armature and said brushes;
- said power tool further comprising at least one switch engaging an activation surface made of an elastic material cooperating with a control element for activating said switch, said switch being supported on at least one of said first and second supporting parts;
- wherein said first supporting part comprises at least one holding surface for holding said at least one switch;
- and
- wherein said first supporting part is configured as an air guide ring forming an air flow channel extending around said commutator between said fan and said stator.
14 more elements
A power tool comprising:
- an electric motor for driving a tool, said electric motor comprising:
- first and second supporting parts, each of said first and second supporting parts having first and second longitudinal ends;
- a tool head attached to the first longitudinal end of said first supporting part;
- a self-supporting stator having a first longitudinal end facing said tool head and a second longitudinal end opposite to the first longitudinal end, the first longitudinal end of said stator being attached to the second longitudinal end of said first supporting part and the second longitudinal end of said stator being attached to the first longitudinal end of said second supporting part
- a motor shaft carrying an armature having a winding core;
- a commutator;
- brushes cooperating with said commutator;
- a fan driven by said motor shaft;
- and
- a housing which externally surrounds said stator and said first and second supporting parts, said housing being connected to at least one of said first and second supporting parts;
- wherein said commutator is arranged between said fan and said winding core of said armature;
- wherein said motor shaft is supported rotatably on said first supporting part, said second supporting part, and said tool head;
- wherein a transitional area is formed within a region where said first supporting part is attached to said tool head;
- said fan lying in the transitional area;
- wherein said first supporting part is arranged for routing air between said fan and an opposite end of said electric motor along said armature and said brushes;
- and
- wherein said first supporting part is configured as an air guide ring forming an air flow channel extending around said commutator between said fan and said stator.
14 more elements
An electric motor comprising:
- first and second supporting parts, each of said first and second supporting parts having two opposing longitudinal ends;
- a self-supporting stator having a first longitudinal end and a second longitudinal end opposite to the first longitudinal end, the first longitudinal end of said stator being attached to one of the longitudinal ends of said first supporting part and the second longitudinal end of said stator being attached to one of the longitudinal ends of said second supporting part;
- a motor shaft carrying an armature having a winding core;
- a commutator;
- brushes cooperating with said commutator;
- a fan driven by said motor shaft;
- and
- a housing which externally surrounds said stator and said first and second supporting parts, said housing being connected to at least one of said first and second supporting parts;
- wherein said commutator is arranged between said fan and said winding core of said armature;
- wherein said motor shaft is supported rotatably on at least one of said first and second supporting parts;
- wherein said first supporting part is arranged for routing air between said fan and an opposite end of said electric motor along said armature and said brushes;
- wherein said first supporting part is configured as an air guide ring forming an air flow channel extending around said commutator between said fan and said stator.
9 more elements
An electric motor comprising:
- first and second supporting parts, each of said first and second supporting parts having two opposing longitudinal ends;
- a self-supporting stator having a first longitudinal end and a second longitudinal end opposite to the first longitudinal end, the first longitudinal end of said stator being attached to one of the longitudinal ends of said first supporting part and the second longitudinal end of said stator being attached to one of the longitudinal ends of said second supporting part;
- a motor shaft carrying an armature having a winding core;
- a commutator;
- brushes cooperating with said commutator;
- a fan driven by said motor shaft;
- and
- a housing which externally surrounds said stator and said first and second supporting parts, said housing being connected to at least one of said first and second supporting parts;
- wherein said commutator is arranged between said fan and said winding core of said armature;
- wherein said motor shaft is supported rotatably on at least one of said first and second supporting parts;
- wherein said first supporting part is arranged for routing air between said fan and an opposite end of said electric motor along said armature and said brushes;
- wherein said first supporting part is arranged within said housing and is configured as an air guide ring forming an air flow channel extending around said commutator between said fan and said stator.
9 more elements
Dependencies are inferred from the claim text.