Ball Screw Deflector Angled Insertion Guide
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Solution Overview
Problem
Conventional ball screws with side deflectors inserted in the radial direction face challenges in preventing dislodgement due to centrifugal forces, requiring precise finishing of nut and deflector surfaces for proper positioning, and lack effective engagement means to secure the deflectors in place.
Innovation Solution
The ball screw design incorporates guide portions and contact portions that guide the circulation member at an angle to the radial direction, along with angled fixing holes and an engagement mechanism, allowing for secure insertion and fixation without additional fixing members, ensuring the circulation member remains in place during nut rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If side deflectors are inserted into the nut in the radial direction, then the assembling is aided by the guiding action of the inner circumferential surface of the receiving hole, but the entire side surface of the inner wall and the corresponding entire side surface of the side deflector are required to be finished at high precision
Solution Approach 1:
The invention changes the insertion direction of the side deflector from the radial direction to a direction that is oblique relative to the radial direction of the nut. This dimensional change allows the side deflector to be guided into place by the angled receiving hole without requiring high-precision finishing of large surface areas, thereby easing manufacturing while maintaining assembly guidance.
2Device complexity
If side deflectors are inserted into the nut in the radial direction, then the structure is simple, but the side deflectors are subjected to centrifugal force directed in the radially outward direction and require appropriate arrangement for preventing removal
Solution Approach 1:
The side deflector is inserted at an angle oblique to the radial direction, creating a geometric interlock between the side deflector and the nut. This angular insertion provides mechanical retention that resists centrifugal forces during rotation, improving reliability while maintaining structural simplicity through the use of angled receiving holes rather than additional complex retention mechanisms.
3Reliability
If engagement means are provided for each end deflector in the axial direction, then inadvertent removal is prevented, but the structure becomes more complex with additional engagement means
Solution Approach 1:
The invention extracts and eliminates the need for separate engagement means (such as holes and projections) by incorporating the retention function directly into the angled insertion geometry of the side deflectors. The oblique receiving holes themselves provide the retention mechanism, simplifying the structure while maintaining reliability.
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
This design effectively prevents the circulation member from dislodging radially outward, simplifies the assembly process by allowing precise positioning without complex surface finishing, and stabilizes the deflector's placement, enhancing the ball screw's operational reliability.
Implementation Method 1
when the nut rotates, the side deflectors are subjected to a centrifugal force directed in the radially outward direction or in the removal direction of the side deflectors
Data Source
AI summary
In a ball screw (1), the positioning of the deflectors to the nut is facilitated, and the deflectors are prevented from being dislodged in the radially outward direction from the nut. The ball screw (1) includes a screw shaft (3), a nut (7), a pair of deflectors (13) inserted in respective receiving holes (14) of the nut and a plurality of balls (8). The nut (7) is provided with a guide portion (42) configured to cooperate with a corresponding guide portion (41) provided on the deflector (13) so that the insertion of the deflector (13) into the respective receiving holes (14) is guided in a direction at an angle to the radial direction of the nut.