# US 12,603,204 B2 · Bobbin and solenoid > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,603,204 B2 - Document ID: US12603204B2 - Status: Granted - Kind: B2 - Application number: 18/501,270 - Filed: 2023-11-03 - Published: 2024-05-30 - Granted: 2026-04-14 - Earliest claimed: 2022-11-28 - Assignees: Robert Bosch GmbH - Applicants: Robert Bosch GmbH - Inventors: Markus Stahl; Valerie Neuffer - Web page: https://patentgrep.com/patent/US12603204B2 ## CPC - H01F 5/02: wound on non-magnetic supports, e.g. formers - H01F 7/06: Electromagnets; Actuators including electromagnets {(electric coils H01F5/00; devices for holding workpieces using electric force B23Q3/15; load-engaging elements for lifting articles electromagnetically B66C1/06; electromagnetic couplings F16D27/00; magnetic brakes F16D63/002; electromagnetically operated valves F16K11/24, F16K31/00; analysing materials by magnetic means G01N27/72, G01N27/80; electromagnets for winding mechanical clocks G04C1/02; electromagnetic relays H01H51/00; windings for salient poles of dynamo-electric machines H02K3/18; electromagnets for telegraphic communication H04L; for arc lamps H05B31/28)} - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES ## Abstract A bobbin for a solenoid. The bobbin includes a main body for receiving wire windings of a wire, wherein the main body extends hollow-cylindrically along an axial direction and has a wall having a wall thickness, wherein at least one opening is formed in the wall, wherein the wall thickness becomes smaller along the axial direction toward the opening, and/or wherein the geometric shape of the opening is designed to vary along the axial direction, at least in sections. A solenoid having such a bobbin and at least one wire winding, is also described. ## Claims ### Claim 1 A bobbin for a solenoid, comprising: a main body configured to receive wire windings of a wire, wherein the main body extends hollow-cylindrically along an axial direction and has a wall having a wall thickness, wherein at least one opening is formed in the wall; wherein: (i) the wall thickness becomes smaller along the axial direction toward the opening and/or a geometric shape of the opening varies along the axial direction at least in sections; wherein the wall thickness in two regions of the wall that are axially adjacent to the opening becomes smaller along the axial direction toward the opening, wherein the regions are each arranged on an outer surface of the main body. ### Claim 2 (depends on 1) The bobbin according to claim 1, wherein the geometric shape of the regions varies along the axial direction away from the opening. ### Claim 3 (depends on 1) The bobbin according to claim 1, wherein the further guide elements are configured to guide a plurality of axially adjacent wire windings contacting the regions through the regions, at least in sections. ### Claim 4 (depends on 1) The bobbin according to claim 1, wherein a geometric shape of the opening is a rectangle. ### Claim 5 (depends on 1) The bobbin according to claim 1, wherein a geometric shape of the opening is a parallelogram. ### Claim 6 (depends on 1) The bobbin according to claim 1, wherein the main body has a first axial end and a second axial end, wherein an edge protruding in a radial direction, is arranged at the first axial end and/or the second axial end. ### Claim 7 A bobbin for a solenoid, comprising: a main body configured to receive wire windings of a wire, wherein the main body extends hollow-cylindrically along an axial direction and has a wall having a wall thickness, wherein at least one opening is formed in the wall; wherein: (i) the wall thickness becomes smaller along the axial direction toward the opening and/or a geometric shape of the opening varies along the axial direction at least in sections; wherein the main body has at least one guide element, wherein the guide element is arranged on an outer surface of the main body and is configured to guide a wire winding, which contacts the outer surface of the main body, along a direction of rotation of the main body, at least in sections. ### Claim 8 A bobbin for a solenoid, comprising: a main body configured to receive wire windings of a wire, wherein the main body extends hollow-cylindrically along an axial direction and has a wall having a wall thickness, wherein at least one opening is formed in the wall; wherein: (i) the wall thickness becomes smaller along the axial direction toward the opening and/or a geometric shape of the opening varies along the axial direction at least in sections; wherein the main body has a plurality of guide elements, wherein the guide elements are arranged and configured on an outer surface of the main body to guide a plurality of axially adjacent wire windings which are in contact with the outer surface of the main body in a direction of rotation of the main body, at least in sections. ### Claim 9 A solenoid, comprising: a bobbin; and at least one layer of wire windings; wherein the bobbin includes: a main body configured to receive wire windings of a wire, wherein the main body extends hollow-cylindrically along an axial direction and has a wall having a wall thickness, wherein at least one opening is formed in the wall, wherein: (i) the wall thickness becomes smaller along the axial direction toward the opening and/or a geometric shape of the opening varies along the axial direction at least in sections; wherein the wall thickness in two regions of the wall that are axially adjacent to the opening becomes smaller along the axial direction toward the opening, wherein the regions are each arranged on an outer surface of the main body.