Dog Clutch Clamping Pin Layout for Stable Shaft Assembly
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Solution Overview
Problem
Existing drive devices with clamp couplings face challenges in stable assembly and secure connection, especially when the motor is already connected, and in preventing overload and corrosion, which affects the reliability and ease of operation.
Innovation Solution
The drive device incorporates a pin aligned tangentially or axially within the clamping area, supported by multiple bores for stability, and a limiting part that limits slot width to prevent overload and corrosion, allowing for easy assembly and secure clamping with reduced joining force, and includes a venting mechanism to prevent oil leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the pin is oriented tangentially and held on one side only, then assembly can be carried out from a tangential direction even when the motor is already connected to the adapter, but the pin mounting stability is reduced
Solution Approach 1:
The clamping area is divided into multiple functional zones: a first clamping zone with a through bore for pin insertion and a second clamping zone with a blind hole for pin retention. This segmentation allows the pin to be inserted from the tangential direction while being retained by the blind hole, achieving both easy assembly and stable mounting.
Solution Approach 2:
The pin retention mechanism transitions from a single-plane constraint to a multi-dimensional constraint system. The pin is constrained in the radial direction by the through bore and in the axial direction by the blind hole, creating a three-dimensional retention system that provides stability while maintaining tangential access.
2Ease of manufacture
If the second bore is designed as a through bore, then the pin can be inserted easily, but air pressure opposing the pin insertion is reduced which decreases joining force
Solution Approach 1:
The bore structure is segmented into two distinct types: a through bore in the first clamping zone for easy pin insertion and a blind hole in the second clamping zone for creating air pressure resistance. This segmentation allows each zone to fulfill its specific function optimally.
Solution Approach 2:
The blind hole acts as an intermediary structure that mediates between the pin insertion force and the joining force requirement. By trapping air pressure within the blind hole, it amplifies the joining force without requiring increased insertion force, thus resolving the contradiction between ease of insertion and joining strength.
3Adaptability or versatility
If the limiting element is connected to the clamping area with play, then the slot width can be limited to a maximum value, but backlash-free connection cannot be achieved
Solution Approach 1:
The limiting element exhibits different connection qualities at different locations: it is connected without play to the first clamping zone to ensure a backlash-free connection, while being connected with play to the second clamping zone to allow slot width limitation. This local differentiation of connection quality resolves the contradiction.
Solution Approach 2:
The connection between the limiting element and the clamping area transitions from a static, uniform connection to a dynamic, differentiated connection. The play in the second clamping zone allows the limiting element to adapt to slot width variations while maintaining the backlash-free connection in the first zone through precise geometric constraints.
4Object-affected harmful factors
If the limiting element restricts the expansion path of the clamping area, then material overload is protected, but the clamping force is limited to a maximum value which may reduce connection strength
Solution Approach 1:
The limiting element serves as a pre-designed cushioning mechanism that prevents over-expansion of the clamping area before material failure can occur. By restricting the expansion path, it protects the material from overload while distributing the clamping force within safe limits, preventing both overload and excessive force concentration.
Data Source
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AI summary
The invention relates to a drive device, comprising at least one clutch and a shaft, wherein the clutch is configured as a dog clutch, wherein a clamping region for providing a clamped connection to the shaft is integrated in the clutch, wherein the clamping region is actuatable by means of a screw (3), wherein the spatial region covered in the event of actuation of the screw (3) is delimited in the direction of the screw axis by means of a pin (4) inserted at least partially into a recess in the clamping region, in particular wherein the pin (4) is oriented tangentially or axially.