Motor
By using through holes for fastening the stator to the casing in in-wheel type motors, the axial size of the motor casing is minimized, addressing the issue of unnecessary thickness in traditional fastening methods.
Patent Information
- Application Number
- JP2023092547
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2023-06-05
- Publication Date
- 2024-12-17
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The use of bottomed fastening holes for fixing the stator to the casing in in-wheel type motors increases the axial size of the casing unnecessarily, as it requires additional thickness for the bottom of the hole and the fastening mechanism.
Configuring the fastening holes in the casing and stator as through holes, allowing the bolts to pass through, eliminates the need for a bottomed hole thickness, thereby reducing the casing's axial size and facilitating efficient fastening.
This configuration reduces the axial size of the motor casing by eliminating unnecessary thickness, allowing for a more compact design and efficient fastening process.
Smart Images
Figure 2024174627000001_ABST
Abstract
Description
[Technical field]
[0001] The technology disclosed in this specification relates to a motor. [Background technology]
[0002] Patent Document 1 describes an in-wheel type motor, in which a stator of the motor is fixed to a casing using bolts. [Prior art documents] [Patent documents]
[0003] [Patent Document 1] JP 2019-140756 A Summary of the Invention [Problem to be solved by the invention]
[0004] In the motor described above, the bolt passes through the stator and is fastened to a fastening hole formed in the casing. The fastening hole has a bottom. In this case, the casing needs a thickness to define the bottom of the fastening hole and a thickness to fasten the stator to the casing with the bolt. This may result in the size of the casing in the axial direction of the motor being enlarged more than necessary. This specification provides a technology that can avoid or suppress such problems. [Means for solving the problem]
[0005] The present specification discloses an in-wheel type motor. The motor may include a casing, a stator housed in the casing, and a bolt fixing the stator to the casing. The bolt may pass through the stator and be fastened to a through hole formed in the casing.
[0006] In the motor described above, the bolt fastening holes provided in the casing are formed as through holes. With this configuration, the casing does not need to have a thickness to define the bottom surface of the fastening holes, and the thickness of the casing can be reduced to the thickness required to fasten and hold the bolts. This makes it possible to prevent the size of the casing in the axial direction of the motor from being unnecessarily enlarged. [Brief description of the drawings]
[0007] [Figure 1] FIG. 2 is a perspective view illustrating a schematic configuration of a motor. [Diagram 2] FIG. 2 is a diagram illustrating a schematic configuration of a motor. [Diagram 3] FIG. 3 is an end view taken along line III-III in FIG. 2 . DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0008] A motor 10 according to an embodiment will be described with reference to the drawings. The motor 10 is a driving motor mounted on a vehicle, and is particularly an in-wheel type motor. The motor 10 is connected to the wheels via a reduction gear.
[0009] 1 and 2, the motor 10 includes a casing 12, a stator 14, a rotor 16, and a plurality of bolts 18. The casing 12 houses the stator 14 and the rotor 16. The stator 14 and the rotor 16 are annular members. The stator 14 is fixed to the casing 12 by the plurality of bolts 18. The rotor 16 is located radially inward of the stator 14.
[0010] The stator 14 includes a stator core 14c and a stator coil (not shown). The stator core 14c has a generally annular shape. A plurality of slots 14s are formed in an inner peripheral edge 14e of the stator 14, and the stator coils are arranged in the plurality of slots 14s. The stator coil may have, for example, a distributed winding structure. A plurality of fastening holes 14h are provided in the stator core 14c. A plurality of bolts 18 are respectively arranged in the plurality of fastening holes 14h. The plurality of bolts 18 fix the stator core 14c to the casing 12. As shown in FIGS. 2 and 3, the plurality of fastening holes 14h are formed in an outer peripheral portion 14f of the stator 14. Each fastening hole 14h is a so-called drilled hole, and penetrates the stator core 14c along the thickness direction of the stator 14.
[0011] The casing 12 is configured to surround the periphery of the stator 14. The casing 12 has a side wall 12a and a peripheral wall 12b. The stator 14 is attached to the side wall 12a. The peripheral wall 12b extends from the side wall 12a in the thickness direction of the stator 14. The peripheral wall 12b surrounds the outer peripheral portion 14f of the stator 14. The side wall 12a of the casing 12 is provided with a plurality of fastening holes 12h, and the stator 14 is fixed by the above-mentioned plurality of bolts 18. Each fastening hole 14h is a threaded through hole, and penetrates the side wall 12a along the thickness direction of the side wall 12a. The plurality of fastening holes 12h of the casing 12 are arranged in accordance with the plurality of fastening holes 14h of the stator 14. Each of the plurality of bolts 18 passes through the corresponding fastening hole 14h of the stator 14 and is fastened to the corresponding fastening hole 14h of the casing 12.
[0012] In the motor 10 described above, the bolts 18 pass through the stator 14 and are fastened to fastening holes 12h formed in the casing 12. If the fastening holes were bottomed, the casing 12 would need a thickness to define the bottom surface of the fastening holes and a thickness to fasten and hold the stator 14 to the casing 12 with the bolts 18. This could result in the size of the casing 12 in the direction of the rotation axis R of the motor 10 being enlarged more than necessary.
[0013] In this regard, in the motor 10 of this embodiment, the fastening holes 12h provided in the casing 12 are configured as through holes. With this configuration, the casing 12 does not need to have a thickness to define the bottom surface of the fastening holes 12h, and the thickness of the casing 12 can be reduced to a thickness required to fasten and hold the bolts 18. This makes it possible to prevent the size of the casing 12 in the direction of the rotation axis R of the motor 10 from increasing unnecessarily.
[0014] In addition, the fastening hole 12h of the casing 12 in this embodiment is configured as a through hole, which makes it easier to thread the inner surface of the fastening hole 12h compared to a case where a bottomed fastening hole is provided, which requires precision in the depth of the fastening hole of the casing 12. Furthermore, the fastening hole 12h of the casing 12 in this embodiment can be threaded from both sides of the side wall 12a. [Explanation of symbols]
[0015] 10: motor, 12: casing, 12h: fastening hole, 14: stator, 14h: fastening hole
Claims
[Claim 1] An in-wheel type motor, A casing; A stator housed in the casing; a bolt fixing the stator to the casing; Equipped with The bolt passes through the stator and is fastened to a through hole formed in the casing. Motor.
Citation Information
Patent Citations
In-wheel motor drive device, rotary motor, and method for manufacturing housing
JP2019140756A