Spindle Housing Cable Routing Without Radial Size Increase
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Solution Overview
Problem
The existing spindle device designs require a cable gland on the outer peripheral surface of the tubular member, leading to an increase in the radial size of the housing due to the need for passing electric power cables through the housing.
Innovation Solution
A spindle device with a holding portion on the end surface of the housing outside the tubular member's outer peripheral surface, extending along the axial direction, and a cutout portion on the tubular member's outer surface, where at least part of the holding portion is disposed inside the cutout portion to manage the line-shaped member, such as a cable, without increasing the housing's radial size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a cable gland is provided on the outer peripheral surface of the tubular member to pass the cable through the housing, then the cable can be routed through the housing, but the outer shape of the housing increases in size in the radial direction of the shaft
Solution Approach 1:
The patent transitions the cable passage from a radial route (through the tubular member's outer surface) to an axial route (through the holding portion on the end surface). By changing the dimension of cable passage from radial to axial, the cable can enter through the end surface and be guided inside the housing to the motor, eliminating the need for a radial cable gland and maintaining compact radial dimensions.
Solution Approach 2:
The holding portion is integrated into the end surface of the housing, and the cable is nested within the housing structure rather than protruding externally. The cable passes through the holding portion and is routed inside the housing, nesting the cable path within the existing housing volume without adding external radial elements.
2Ease of operation
If the holding portion is provided outside the outer peripheral surface of the tubular member, then the cable can be held and routed through the housing, but it may increase the radial size of the housing
Solution Approach 1:
The holding portion is localized to the end surface of the housing rather than being distributed on the outer peripheral surface of the tubular member. This local concentration of the cable holding function on the axial end surface allows effective cable routing without extending the radial dimensions of the housing.
Data Source
AI summary
Provided is a spindle device which can inhibit the spreading of the exterior shape of a housing in the radial direction of a shaft. One embodiment relates to a spindle device having a tubular member which is fixed to a housing through which a shaft is inserted, and which extends to outside along the axial direction of the shaft from an end surface of the housing on the other end side of the shaft. The spindle device includes: a holding part which is provided to the end surface of the housing outside of the outer peripheral surface of the tubular member, and which holds a linear member that extends along the axial direction of the shaft and passes inside of the housing; and a cut-out section formed in the outer peripheral surface of the tubular member. At least a portion of the holding part is disposed on the inner side of the cut-out section.