Starter motors

A starter motor, for an internal combustion engine, comprising an electric motor, a shaft rotated by said motor, a pinion gear wheel carried by said shaft, the pinion gear wheel being rotated with the shaft, and being axially movable relative thereto between an operative position and a rest position, and an electromagnet comprising an armature coupled to the pinion gear wheel and guided for movement parallel to the shaft, first and second electromagnet poles spaced apart around said shaft, the first and second poles being spaced from the armature in the rest position thereof in the direction of movement of the armature, a member magnetically interconnecting the first and second poles, and an electromagnet winding which when energized induces a flow of magnetic flux in the flux path of the electromagnet, the flux path of the electromagnet being from the first pole to the armature, within the armature laterally relative to said shaft, from the armature to the second pole, and from the second pole within said member back to the first pole, wherein said first and second poles lie in a common plane transverse to the axis of said shaft, a second electromagnet winding, both windings encircling respective poles, a third electromagnet winding, and those portions of the poles presented to the armature being stepped, the periphery of the armature being shaped to mate with the stepped form of the poles.

A starter motor, for an internal combustion engine, comprising an electric motor, a shaft rotated by said motor, a pinion gear wheel carried by said shaft, the pinion gear wheel being rotated with the shaft, and being axially movable relative thereto between an operative position and a rest position, and an electromagnet comprising an armature coupled to the pinion gear wheel and guided for movement parallel to the shaft, first and second electromagnet poles spaced apart around said shaft, the first and second poles being spaced from the armature in the rest position thereof in the direction of movement of the armature, a member magnetically interconnecting the first and second poles, and an electromagnet winding which when energized induces a flow of magnetic flux in the flux path of the eleectromagnet, the flux path of the electromagnet being from the first pole to the armature, within the armature laterally relative to said shaft, from the armature to the second pole, and from the second pole within said member back to the first pole, wherein said first and second poles lie in a common plane transverse to the axis of said shaft, wherein the member magnetically interconnecting the poles is arcuate and coaxial with the shaft, and wherein said member is a complete cylinder, those portions of the poles presented to the armature being stepped, and the periphery of the armature being shaped to mate with the stepped form of the poles.

A starter motor, for an internal combustion engine, comprising an electric motor, a shaft rotated by said motor, a pinion gear wheel carried by said shaft, the pinion gear wheel being rotated with the shaft, and being axially movable relative thereto between an operative position and a rest position, and a electromagnet comprising an armature coupled to the pinion gear wheel and guided for movement parallel to the shaft, first and second electromagnet poles spaced apart around said shaft, the first and second poles being spaced from the armature in the rest position thereof in the direction of movement of the armature, a member magnetically interconnecting the first and second poles, and an electromagnet winding which when energized induces a flow of magnetic flux in the flux path of the electromagnet, the flux path of the electromagnet being from the first pole to the armature, within the armature laterally relative to said shaft, from the armature to the second pole, and from the second pole within said member back to the first pole, wherein said first and second poles lie in a common plane transverse to the axis of said shaft, and wherein the armature and the poles have associated therewith a non-magnetic spacer which prevents physical contact between the armature and poles and so facilitates movement of the armature away from the poles when the electromagnet is de-energized, those portions of the poles presented to the armature being stepped, and the periphery of the armature being shaped to mate with the stepped form of the poles.

A starter motor, for an internal combustion engine, comprising an electric motor, a shaft rotated by said motor, a pinion gear wheel carried by said shaft, the pinion gear wheel being rotated with the shaft, and being axially movable relative thereto between an operative position and a rest position, and an electromagnet comprising an armature coupled to the pinion gear wheel and guided for movement parallel to the shaft, first and second electromagnet poles spaced apart around said shaft, the first and second poles being spaced from the armature in the rest position thereof in the direction of movement of the armature, a member magnetically interconnecting the first and second poles, and en electromagnet winding which when energized induces a flow of magnetic flux in the flux path of the electromagnet, the flux path of the electromagnet being from the first pole to the armature, within the armature laterally relative to said shaft, from the armature to the second pole, and from the second pole within said member back to the first pole, wherein said first and second poles lie in a common plane transverse to the axis of said shaft, and wherein the armature is guided for movement parallel to said shaft by said poles through the intermediary of a non-magnetic spacer, those portions of the poles presented to the armature being stepped, and the periphery of the armature being shaped to mate with the stepped form of the poles.

A starter motor for an internal combustion engine, comprising an electric motor, a shaft rotated by said motor, a pinion gear wheel carried by said shaft, the pinion gear wheel being rotated with the shaft, and being axially movable relative thereto between an operative position and a rest position, and an electromagnet comprising an armature coupled to the pinion gear wheel and guided for movement parallel to the shaft, first and second electromagnet poles spaced apart around said shaft, the first and second poles being spaced from the armature in the rest position thereof in the direction of movement of the armature, a member magnetically interconnecting the first and second poles, and an electromagnet winding which when energized induces a flow of magnetic flux in the flux path of the electromagnet, the flux path of the electromagnet being from the first pole to the armature, within the armature laterally relative to said shaft, from the armature to the second pole, and from the second pole within said member back to the first pole, wherein said first and second poles lie in a common plane transverse to the axis of said shaft, and wherein said shaft is a secondary shaft driven by the rotor shaft of the starter motor, and wherein the secondary shaft is driven by the rotor shaft through an epicyclie gear train, those portions of the poles presented to the armature being stepped, and the periphery of the armature being shaped to mate with the stepped form of the poles.

A starter motor, for an internal combustion, engine, comprising an electric motor, a shaft rotated by said motor, a pinion gear wheel carried by said shaft, the pinion gear wheel being rotated with the shaft, and being axially movable relative thereto between an operative position and a rest position, and an electromagnet comprising an armature coupled to the pinion gear wheel and guided for movement parallel to the shaft, first and second electromagnet poles spaced apart around said shaft, the first and second poles being spaced from the armature in the rest position thereof in the direction of movement of the armature, a member magnetically interconnecting the first and second poles, and an electromagnet winding which when energized induces a flow of magnetic flux in the flux path of the electromagnet, the flux path of the electromagnet being from the first pole to the armature, within the armature laterally relative to said shaft, from the armature to the second pole, and from the second pole within said member back to the first pole, wherein said first and second poles lie in a common plane transverse to the axis of said shaft, wherein said shaft is a secondary shaft driven by the rotor shaft of the starter motor, and wherein the field arrangement of the starter motor is a permanent magnet arrangement those portions of the poles presented to the armature being stepped, and the periphery of the armature being shaped to mate with the stepped form of the poles.

A starter motor, for an internal combustion engine, comprising an electric motor, a shaft rotated by said motor, a pinion gear wheel carried by said shaft, the pinion gear wheel being rotated with the shaft, and being axially movable relative thereto between an operative position and a rest position, and an electromagnet comprising an armature coupled to the pinion gear wheel and guided for movement parallel to the shaft, first and second electromagnet poles spaced apart around said shaft, the first and second poles being spaced from the armature in the rest position thereof in the direction of movement of the armature, a member magnetically interconnecting the first and second poles, and an electromagnet winding which when energized induces a flow of magnetic flux in the flux path of the electromagnet, the flux path of the electromagnet being from the first pole to the armature, within the armature laterally relative to said shaft, from the armature to the second pole, and from the second pole within said member back to the first pole, wherein said first and second poles lie in a common plane transverse to the axis of said shaft and wherein there is provided a set of electrical contacts controlling energization of the starter motor, the contacts being operated when the armature moves to a predetermined position relative to the remainder of the starter motor, those portions of the poles presented to the armature being stepped, and the periphery of the armature being shaped to mate with the stepped form of the poles.

A starter motor of an internal combustion engine comprising in combination a casing including a cylindrical main portion housing the motor field assembly, a yoke coaxial with the main portion, and an end bracket, the yoke being positioned between the end bracket and the casing main portion, a rotor shaft journalled for rotation in the casing main portion and the end bracket and extending through the yoke, a pair of electromagnet poles carried by the yoke and extending generally diametrically opposite one another towards the rotor shaft, an electromagnet winding encircling each of the poles, a pinion gear wheel carried by the rotor shaft and rotatable therewith, the pinion gear wheel being movable axially relative to the rotor shaft and having an electromagnet armature coupled thereto, a non-magnetic sleeve carried by the armature and slidably engaging said poles so as to guide the armature for movement relative to the poles in a direction parallel to the shaft and resilient means urging the armature and the pinion to a rest position wherein the armature is spaced from the poles, said windings when energized inducing a flow of magnetic flux from one of the poles to the armature across the air gap, through the armature in a direction transverse to the shaft, from the armature back to the other pole, and from the other pole circumferentially within the yoke back to said one pole, those portions of the poles presented to the armature being stepped, and the periphery of the armature being shaped to mate with the stepped form of the poles.

A starter motor for an internal combustion engine, comprising in combination:

• a casing including a cylindrical main portion, a yoke portion, and an end portion, the yoke portion being positioned between the end portion and the casing main portion, an electric motor having an armature and a field assembly with poles disposed in said casing main portion, a shaft journalled for rotation by said electric motor in the end portion and extending through the yoke portion, a separate pair of electromagnet poles carried by the yoke portion and extending generally diametrically opposite one another towards the shaft, a separate electromagnet winding encircling at least one of the separate poles, a pinion gear wheel carried by the shaft and rotatable therewith, the pinion gear wheel being movable axially relative to the shaft and having a separate electromagnet armature coupled thereto, means for guiding the separate armature for movement relative to the separate poles in a direction parallel to the shaft, said separate armature entering an area between said separate poles as said separate armature moves the pinion towards an operative position, resilient means urging the separate armature and the pinion to a rest position wherein the separate armature is spaced from the separate poles, said separate electromagnet winding when energized inducing a flow of magnetic flux from one of the separate poles to the separate armature across an air gap, through the separate armature in a direction transverse to the shaft, from the separate armature back to the other separate pole, and from the other separate pole circumferentially within the yoke portion back to said one separate pole so as to attract said separate armature and effect a controlled movement of said separate armature in said direction parallel to said shaft, those portions of the separate poles presented to the separate armature being stepped, and the periphery of the separate armature being shaped to mate with the stepped form of the separate poles.

A starter motor, for an internal combustion engine, comprising an electric motor, a shaft rotated by said motor, a pinion gear wheel carried by said shaft, the pinion gear wheel being rotated with the shaft, and being axially movable relative thereto between an operative position and a rest position, and an electromagnet comprising an armature coupled to the pinion gear wheel and guided for movement parallel to the shaft, first and second electromagnet poles spaced apart around said shaft, the first and second poles being spaced from the armature in the rest position thereof in the direction of movement of the armature, a member magnetically interconnecting the first and second poles, and an electromagnet winding which when energized induces a flow of magnetic flux in the flux path of the electromagnet, the flux path of the electromagnet being from the first pole to the armature, with the armature laterally relative to said shaft, from the armature to the second pole, and from the second pole within said member back to the first pole, wherein said first and second poles lie in a common plane transverse to the axis of said shaft, third and fourth electromagnet poles, the third and fourth poles being spaced from the first and second poles in said plane, and being magnetically connected to the first and second poles by said member, said armature being of frusto-conical form, and said poles being of mating frusto-conical form.

A starter motor, for an internal combustion engine, comprising an electric motor, a shaft rotated by said motor, a pinion gear wheel carried by said shaft, the pinion gear wheel being rotated with the shaft, and being axially movable relative thereto between an operative position and a rest position, and an electromagnet comprising an armature coupled to the pinion gear wheel and guided for movement parallel to the shaft, first and second electromagnet poles spaced apart around said shaft, the first and second poles being spaced from the armature in the rest position thereof in the direction of movement of the armature, a member magnetically interconnecting the first and second poles, and an electromagnet winding which when energized induces a flow of magnetic flux in the flux path of the electromagnet, the flux path of the electromagnet being from the first pole to the armature, within the armature laterally relative to said shaft, from the armature to the second pole, and from the second pole within said member back to the first pole, wherein said first and second poles lie in a common plane transverse to the axis of said shaft, and wherein the armature and the poles have associated therewith a nonmagnetic spacer which prevents physical contact between the armature and the poles and so facilitates movement of the armature away from the poles when the electromagnet is de-energized, the armature being of frusto-conical form, and said poles being of mating frusto-conical form.

A starter motor, for an internal combustion engine, comprising an electric motor, a shaft rotated by said motor, a pinion gear wheel carried by said shaft, the pinion gear wheel being rotated with the shaft, and being axially movable relative thereto between an operative position and a rest position, and an electromagnet comprising an armature coupled to the pinion gear wheel and guided for movement parallel to the shaft, first and second electromagnet poles spaced apart around said shaft, the first and second poles being spaced from the armature in the rest position thereof in the direction of movement of the armature, a member magnetically interconnecting the first and second poles, and an electromagnet winding which when energized induces a flow of magnetic flux in the flux path of the electromagnet, the flux path of the electromagnet being from the first pole to the armature, within the armature laterally relative to said shaft, from the armature to the second pole, and from the second pole within said member back to the first pole, wherein said first and second poles lie in a common plane transverse to the axis of said shaft, and wherein said shaft is a secondary shaft driven by the rotor shaft of the starter motor, the secondary shaft being driven by the rotor shaft through an epicyclic gear train, and said armature being of frusto-conical form, said poles being of mating frusto-conical form.

A starter motor, for an internal combustion engine, comprising an electric motor, a shaft rotated by said motor, a pinion gear wheel carried by said shaft, the pinion gear wheel being rotated with the shaft, and being axially movable relative thereto between an operative position and a rest position, and an electromagnet comprising an armature coupled to the pinion gear wheel and guided for movement parallel to the shaft, first and second electromagnet poles spaced apart around said shaft, the first and second poles being spaced from the armature in the rest position thereof in the direction of movement the armature, a member magnetically interconnecting the first and second poles, and an electromagnet winding which when energized induces a flow of magnetic flux in the flux path of the electromagnet, the flux path of the electromagnet being from the first pole to the armature, within the armature laterally relative to said shaft, from the armature to the second pole, and from the second pole within said member back to the first pole, wherein said first and second poles lie in a common plane transverse to the axis of said shaft, wherein said shaft is a secondary shaft driven by the rotor shaft of the starter motor, the field arrangement of the starter motor being a permanent magnet arrangement, said armature being of frusto-conical form, and said poles being of mating frusto-conical form.

A starter motor, for an internal combustion engine, comprising an electric motor, a shaft rotated by said motor, a pinion gear wheel carried by said shaft, the pinion gear wheel being rotated with the shaft, and being axially movable relative thereto between an operative position and a rest position, and an electromagnet comprising an armature coupled to the pinion gear wheel and guided for movement parallel to the shaft, first and second electromagnet poles spaced apart around said shaft, the first and second poles being spaced from the armature in the rest position thereof in the direction of movement of the armature, a member magnetically interconnecting the first and second poles, and an electromagnet winding which when energized induces a flow of magnetic flux in the flux path of the electromagnet, the flux path of the electromagnet being from the first pole to the armature, within the armature laterally relative to said shaft, from the armature to the second pole, and from the second pole within said member back to the first pole, wherein said first and second poles lie in a common plane transverse to the axis of said shaft, and wherein there is provided a set of electrical contacts controlling energization of the starter motor, the contacts being operated when the armature moves to a predetermined position relative to the remainder of the starter motor, the armature being of frusto-conical form, and said poles being of mating frusto-conical form.

A starter motor for an internal combustion engine comprising in combination a casing including a cylindrical main portion housing the motor field assembly, a yoke co-axial with the main portion, and an end bracket, the yoke being positioned between the end bracket and the casing main portion, a rotor shaft journalled for rotation in the casing main portion and the end bracket and extending through the yoke, a pair of electromagnet poles carried by the yoke and extending generally diametrically opposite one another towards the rotor shaft, an electromagnet winding encircling each of the poles, a pinion gear wheel carried by the rotor shaft and rotatable therewith, the pinion gear wheel being movable axially relative to the rotor shaft and having an electromagnet armature coupled thereto, a non-magnetic sheelve carried by the armature and slidably engaging said pole so as to guide the armature for movement relative to the poles in a direction parallel to the shaft and resilient means urging the armature and the pinion to a rest position wherein the armature is spaced from the poles, said windings when energized inducing a flow of magnetic flux from one of the poles to the armature across the air gap, through the armature in a direction transverse to the shaft, from the armature back to the other pole, and from the other pole circumferentially within the yoke back to said one pole, said armature being of frusto-conical form, and said poles being of mating frusto-conical form.

A starter motor for an internal combustion engine, comprising in combination:

• a casing including a cylindrical main portion, a yoke portion, and an end portion, the yoke portion being positioned between the end portion and the casing main portion, an electric motor having an armature and a field assembly with poles disposed in said casing main portion, a shaft journalled for rotation by said electric motor in the end portion and extending through the yoke portion, a separate pair of electromagnet poles carried by the yoke portion and extending generally diametrically opposite one another towards the shaft, a separate electromagnet winding encircling at least one of the separate poles, a pinion gear wheel carried by the shaft and rotatable therewith, the pinion gear wheel being movable axially relative to the shaft and having a separate electromagnet armature coupled thereto, means for guiding the separate armature for movement relative to the separate poles in a direction parallel to the shaft, said separate armature entering an area between said separate poles as said separate poles as said separate armature moves the pinion towards an operative position, resilient means urging the separate armature and the pinion to a rest position wherein the separate armature is spaced from the separate poles, said separate electromagnet winding when energized inducing a flow of magnetic flux from one of the separate poles to the separate armature across an air gap, through the separate armature in a direction transverse to the shaft, from the separate armature back to the other separate pole, and from the other separate pole circumferentially within the yoke portion back to said one separate pole so as to attract said separate armature and effect a controlled movement of said separate armature in said direction parallel to said shaft, said separate armature being of frusto-conical form, and those portions of said separate poles presented to said separate armature being of mating frusto-conical form.