Solenoid with reverse turn spool hub projection
First Claim
Patent Images
1. A solenoid arrangement for a starter motor comprising:
- a plunger configured to move in an axial direction;
a coil positioned radially outward from the plunger, the coil including a first winding layer and at least one additional winding layer positioned radially outward from the first winding layer, the first winding layer including a first portion wound in a first winding direction and a second portion wound in a second winding direction that is opposite the first winding direction, the at least one additional winding layer wound only in the second winding direction and positioned radially outward from both the first portion and the second portion of the first winding layer;
a spool including a first end and a second end with a hub extending between the first end and the second end; and
a projection positioned on the hub, wherein the coil is wound on the spool and engages the projection in such a manner that a winding direction of the coil is reversed at the projection.
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Abstract
A solenoid arrangement for a starter motor includes a plunger configured to move in an axial direction and a coil positioned radially outward from the plunger. The coil is wound on a spool that includes a first end and a second end with a hub extending between the first end and the second end. A projection is positioned on the hub of the spool. The coil engages the projection in such a manner that a winding direction of the coil is reversed at the projection.
18 Citations
18 Claims
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1. A solenoid arrangement for a starter motor comprising:
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a plunger configured to move in an axial direction; a coil positioned radially outward from the plunger, the coil including a first winding layer and at least one additional winding layer positioned radially outward from the first winding layer, the first winding layer including a first portion wound in a first winding direction and a second portion wound in a second winding direction that is opposite the first winding direction, the at least one additional winding layer wound only in the second winding direction and positioned radially outward from both the first portion and the second portion of the first winding layer; a spool including a first end and a second end with a hub extending between the first end and the second end; and a projection positioned on the hub, wherein the coil is wound on the spool and engages the projection in such a manner that a winding direction of the coil is reversed at the projection. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of making a solenoid, the method comprising:
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winding a conductor in a first direction to provide a first part of a first layer of a coil; winding the conductor in a second direction to provide a second part of the first layer of the coil, the second direction opposite the first direction; and winding the conductor in the second direction over the first part and the second part of the first layer of the coil to form a second layer of the coil. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A starter motor comprising:
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an electric motor; a solenoid including a plunger configured to move in an axial direction between a first position and a second position, wherein the plunger engages electrical contacts in the second position and closes an electrical circuit configured to provide power to the electric motor, a coil wound around a coil retaining surface of a coil holder, the coil retaining surface extending between a first end and a second end of the coil holder; and a turn member positioned on the coil retaining surface of the coil holder, wherein the coil is wrapped at least partially around the turn member in order to change a winding direction of the coil from a first direction to a second direction that is opposite the first direction, wherein the coil engages the turn member in a first layer of the coil such that the first layer includes a first portion wound in a first direction and a second portion wound in a second direction, and wherein the coil includes at least one additional winding layer positioned radially outward from the first winding layer, the at least one additional winding layer wound in the second direction around both the first portion and the second portion of the first layer. - View Dependent Claims (17, 18)
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Specification