CN-122001113-A - Stator core and method for manufacturing same

CN122001113ACN 122001113 ACN122001113 ACN 122001113ACN-122001113-A

Abstract

A stator core and a method of manufacturing the same are provided. The stator core (10) includes a cylindrical core body (11) and a plurality of bolt insertion members (20, 120). Each bolt insertion member is welded to the outer peripheral surface (11 a) of the core body, and bolt insertion holes (20 a, 120 a) extending in the axial direction of the core body are formed. Each bolt insertion member has at least one opposing surface (21, 21A, 21B, 21C, 121) opposing the outer peripheral surface of the core body. At least one of the opposing faces has at least one welded portion (29) welded to the outer peripheral surface of the core body, and an abutting portion (22, 22A, 22B, 22C, 122A) abutting against the outer peripheral surface of the core body but not welded to the outer peripheral surface of the core body.

Inventors

MUTOH HIROSHI
FUKAYA HIROYUKI

Assignees

株式会社电装

Dates

Publication Date: 20260508
Application Date: 20251031
Priority Date: 20241106

Claims (9)

1.A stator core, comprising: a cylindrical core body, and A plurality of bolt insertion members each of which is welded to an outer peripheral surface of the core body and in each of which a bolt insertion hole extending in an axial direction of the core body is formed, It is characterized in that the method comprises the steps of, Each of the bolt insertion members has at least one opposing face opposing the outer peripheral face of the core main body, The at least one opposing face has at least one welded portion welded to the outer peripheral surface of the core body, and an abutting portion abutting the outer peripheral surface of the core body but not welded to the outer peripheral surface of the core body.
2. The stator core according to claim 1, wherein, The at least one opposing face also has at least one non-contact portion between the at least one welded portion and the abutting portion, which is neither in contact nor welded with the outer peripheral surface of the core main body.
3. The stator core according to claim 1 or 2, characterized in that, Each of the bolt insertion members has a pair of welding portions as the at least one welding portion of the at least one opposing face, the pair of welding portions being respectively formed at both outer end portions of the bolt insertion member in the circumferential direction of the core body.
4. The stator core according to claim 3, wherein, Each of the bolt insertion members is formed in a groove shape extending in the axial direction of the core main body; each of the bolt insertion members has a pair of opposed faces as the at least one opposed face, the pair of opposed faces being separated from each other in the circumferential direction of the core main body, and each of the pair of opposed faces has one welded portion and one abutting portion, In each of the bolt insertion members, the abutment portions of the pair of opposed faces are respectively formed at two inner end portions of the bolt insertion member in the circumferential direction of the core body.
5. The stator core according to claim 3, wherein, Each of the bolt insertion members is formed in a tubular shape extending in the axial direction of the core body, Each of the bolt insertion members has a single opposing face as the at least one opposing face, The single opposing face has the abutment portion and the pair of welding portions formed respectively on opposite sides of the abutment portion in the circumferential direction of the core main body.
6. A method for manufacturing a stator core, The stator core has: a cylindrical core body, and A plurality of bolt insertion members each of which is welded to an outer peripheral surface of the core body and in each of which a bolt insertion hole extending in an axial direction of the core body is formed, It is characterized in that the method comprises the steps of, The method for manufacturing the stator core comprises the following steps: a facing step of facing each of the bolt insertion members to the outer peripheral surface of the core body; an abutting step of abutting at least a part of at least one opposing face of each of the bolt insertion members against the outer peripheral face of the core main body to form an abutting portion, and And a welding step of welding a part of the at least one opposing face of each of the bolt insertion members to the outer peripheral face of the core main body to form at least one welded portion, and at least a part of the abutting portion of the at least one opposing face is not welded to the outer peripheral face of the core main body.
7. The method of claim 6, wherein the step of providing the first layer comprises, In the abutting step, only a part of the at least one opposing surface is abutted against the outer peripheral surface of the core main body to form the abutting portion; In the welding process, only a part of the at least one opposing face is welded to the outer peripheral face of the core main body to form the at least one welded portion, and at least one non-contact portion that is neither in contact nor welded with the outer peripheral face of the core main body is formed between the at least one welded portion and the abutting portion of the at least one opposing face.
8. The method according to claim 6 or 7, wherein, In the welding step, for each of the bolt insertion members, both outer end portions of the bolt insertion member in a circumferential direction of the core body are welded to the outer peripheral surface of the core body to form a pair of welded portions as the at least one welded portion.
9. The method according to claim 6 or 7, wherein, Each of the bolt insertion members is formed in a groove shape extending in the axial direction of the core main body, and The method for manufacturing a stator core further includes a forming step of forming each of the bolt insertion members by bending a metal plate into a groove shape before the facing step.

Description

Stator core and method for manufacturing same Technical Field The invention relates to a stator core and a method for manufacturing the same. Background There is known a stator core including a cylindrical laminated core and a plurality of rib members (for example, see patent document 1 listed below). Each rib member is formed with a bolt insertion portion and is joined to the outer peripheral surface of the laminated core. In addition, the plurality of rib members are separated from each other in the circumferential direction of the laminated core. Further, each of the rib members has an inner peripheral surface formed in a shape in which both circumferential side portions of the inner peripheral surface are in contact with the outer peripheral surface of the laminated core, and the both circumferential side portions of the inner peripheral surface are welded to the laminated core in a state in which both circumferential side portions are in contact with the outer peripheral surface of the laminated core. With this structure, the rib member can be in contact with the laminated core along the line extending in the axial direction of the laminated core. Therefore, the rib member and the laminated core can be brought into contact in a stable state, whereby stable welding strength between the rib member and the laminated core can be ensured. Prior art literature Patent literature Patent document 1 Japanese patent No. 6651268. Technical problem to be solved by the invention In the known stator core, for each rib member (or bolt insertion member), both circumferential side portions of an inner peripheral surface of the rib member, which is in contact with an outer peripheral surface of the laminated core (or core body), are welded to the outer peripheral surface of the laminated core. Therefore, in the welding process, these portions of the rib member supported by the outer peripheral surface of the laminated core melt, and therefore the rib member may be displaced with respect to the laminated core. Disclosure of Invention The present invention has been made to solve the above-mentioned problems. Accordingly, a primary object of the present invention is to provide a stator core and a method of manufacturing the same, which can prevent displacement of a bolt insertion member with respect to a core main body during welding of the bolt insertion member to the core main body. Technical means for solving the technical problems According to a first aspect of solving the above-described problems, there is provided a stator core including a cylindrical core body and a plurality of bolt insertion members. Each bolt insertion member is welded to the outer peripheral surface of the core body, and is formed with a bolt insertion hole extending in the axial direction of the core body. Further, each of the bolt insertion members has at least one opposing surface opposing the outer peripheral surface of the core body. The at least one opposing face has at least one welded portion welded to an outer peripheral surface of the core body, and an abutting portion abutting against the outer peripheral surface of the core body but not welded to the outer peripheral surface of the core body. According to the first aspect, the stator core includes a cylindrical core body and bolt insertion members each welded to an outer peripheral surface of the core body and formed with a bolt insertion hole extending in an axial direction of the core body. Accordingly, after the stator coil is mounted to the stator core, the stator core may be fixed to the housing by passing bolts through the bolt insertion holes and fastening the bolts to the housing, respectively. Further, according to the first aspect, each of the bolt insertion members has at least one opposing face opposing the outer peripheral face of the core body, and the at least one opposing face has at least one welded portion welded to the outer peripheral face of the core body. Accordingly, each bolt insertion member is fixed to the outer peripheral surface of the core body at least one welded portion of at least one of the opposed faces of the bolt insertion member. During welding of the bolt insertion member to the outer peripheral surface of the core body, if melting occurs at a portion where the bolt insertion member is supported by the outer peripheral surface of the core body, the bolt insertion member may be displaced with respect to the core body. In this regard, according to the first aspect, at least one of the opposing surfaces of each of the bolt insertion members has an abutment portion that abuts against the outer peripheral surface of the core body but is not welded to the outer peripheral surface of the core body. Therefore, the abutting portion of the bolt insertion member can be supported by the outer peripheral surface of the core main body while the bolt insertion member is welded to the outer peripheral surface of the core main body. As a result, displacement of th