Vehicle Steering Coupling with Sealed Cooling for Electromagnet Stability
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Solution Overview
Problem
The rotation transmission device becomes unstable when the open end of the large-diameter tubular portion of the case is completely closed, leading to trapped heat and a rise in the temperature of the electromagnet, which can reduce the attracting force and destabilize the device.
Innovation Solution
The use of a cover member made of aluminum, which provides excellent thermal conductivity, is mounted axially opposed to the electromagnet to prevent temperature rise. Additionally, seal members such as O-rings and oil seals are used to prevent foreign matter from entering the device, and the input shaft bearing is kept out of contact with the field core to prevent magnetic flux leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the open end of the large-diameter tubular portion of the case is completely closed to prevent foreign matter entry, then protection against foreign matter is improved, but heat dissipation deteriorates causing temperature rise of the electromagnet
Solution Approach 1:
The case is divided into two separate openings: a first opening and a second opening. The first opening is configured to prevent foreign matter entry, while the second opening is specifically provided for heat dissipation of the electromagnet. This segmentation allows each opening to serve its specific function independently, resolving the contradiction between protection and thermal management.
Solution Approach 2:
A cover member is introduced as an intermediary component that covers the first opening to prevent foreign matter entry. This cover member can be selectively opened or designed with openings to allow heat dissipation, serving as a mediator between the conflicting requirements of protection and thermal management.
2Object-affected harmful factors
If the electromagnet temperature rises due to heat trapping, then the attracting force of the electromagnet decreases, but closing the case opening prevents foreign matter entry
Solution Approach 1:
The case opening is segmented into a first opening for foreign matter protection and a second opening for heat dissipation. By providing a dedicated second opening, heat can escape to maintain electromagnet temperature and attracting force, while the first opening continues to prevent foreign matter entry.
Solution Approach 2:
The cover member acts as an intermediary that can be designed with selective permeability - preventing foreign matter while allowing heat dissipation. This mediator component resolves the contradiction by selectively blocking harmful factors while permitting necessary thermal exchange.
3Object-affected harmful factors
If seal members are added to prevent foreign matter entry, then protection is improved, but device complexity increases
Solution Approach 1:
The cover member serves multiple functions: it prevents foreign matter entry, allows heat dissipation, and can be integrated with seal members for enhanced protection. By making the cover member multi-functional, the need for separate complex sealing structures is reduced, as the cover itself becomes a primary protective element.
Solution Approach 2:
Flexible seal members such as O-rings and oil seals are used to provide effective sealing with simple structures. These flexible sealing elements can accommodate minor misalignments and surface irregularities, providing reliable foreign matter protection without requiring complex rigid sealing mechanisms.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents foreign matter from entering the device and reduces the risk of temperature-related instability, ensuring stable operation of the rotation transmission device even in environments where foreign matter may adhere.
Implementation Method 1
The use of a cover member made of aluminum, which provides excellent thermal conductivity, is mounted axially opposed to the electromagnet to prevent temperature rise
Implementation Method 2
an annular electromagnet; an armature supported for axial movement when the electromagnet is energized
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A rotation transmission device is provided which includes rollers (7a and 7b) disposed between the inner periphery of an outer ring (6) and the outer periphery of an inner ring (5); an armature (31) supported to axially move when an electromagnet (30) is energized; and a ball ramp mechanism (33) which converts the axial movement of the armature (31) into the motion/movement of a roller cage (8) from an engaged position to a disengaged position. This rotation transmission device further incudes an annular cover member (42) made of aluminum, an O-ring (55) and an oil seal (57).