Turbocharger Speed Sensor Insert with Bearing Spacer Indexing
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Solution Overview
Problem
Turbocharger speed sensors are prone to failure due to their delicate nature and harsh environment, and the process of replacing them can cause the journal bearing spacer to rotate, leading to misalignment and potential damage, while fluctuating torque also damages the sensor probe.
Innovation Solution
An insert is designed to extend through the bearing housing and into the spacer window, remaining in place during speed sensor removal and reinstallation, maintaining alignment and preventing spacer rotation and sensor probe damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If the speed sensor is removed for replacement, then the sensor can be serviced or replaced, but the journal bearing spacer rotates leading to misalignment and potential damage
Solution Approach 1:
The patent applies preliminary action by providing a retaining feature on the spacer that maintains alignment before sensor replacement occurs. The retaining feature (such as a protrusion or keyway)预先 engages with the sensor housing or bearing housing, ensuring the spacer remains in its correct rotational position even when the sensor is removed. This prevents the spacer from rotating during sensor replacement operations.
2Reliability
If the speed sensor operates in the harsh turbocharger environment, then the sensor can monitor turbocharger speed, but the sensor is prone to failure due to delicate nature and harsh environment
Solution Approach 1:
The patent applies beforehand cushioning by providing a protected mounting arrangement for the speed sensor. The sensor is mounted in a dedicated sensor housing that is integrated with or attached to the bearing housing, which provides mechanical protection and stable positioning. This protective structure cushions the delicate sensor against the harsh vibrational, thermal, and mechanical environment of the turbocharger, reducing failure rates.
3Stability of the object's composition
If the journal bearing spacer is secured against rotation, then the spacer alignment is maintained, but the sensor probe is damaged by fluctuating torque
Solution Approach 1:
The patent applies segmentation by separating the functions of securing the spacer and mounting the sensor into distinct components. The retaining feature on the spacer secures the spacer against rotation independently, while the sensor is mounted in a separate sensor housing that is attached to the bearing housing. This segmentation isolates the sensor probe from the fluctuating torques that act on the spacer, preventing torque transmission to the sensor probe while maintaining spacer rotational stability.
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 allows for easy service and replacement of the speed sensor while maintaining spacer alignment, reducing sensor failure rates and preventing damage from fluctuating torque, thereby enhancing sensor durability and reducing the need for replacements.
Implementation Method 1
Variable reluctance (VR) sensors use a coil around a magnet in the end of the sensor. As the rotating target cyclically gets closer and further from the magnet, the attraction forces change the shape of the magnetic field, which induces a measurable voltage in the coil.
Data Source
AI summary
A turbocharger bearing housing, including a bearing bore having two journal bearings located in the bearing bore and a tubular bearing spacer having first and second axial ends for spacing apart said journal bearings. The tubular bearing spacer having at least one radial opening and a mounting bore for receipt of a turbocharger shaft. The mounting bore further being capable of receiving a generally tubular insert mounted therein and extending into the at least one radial opening of the bearing spacer. The tubular insert further including an indexing surface to assist in setting the depth of insertion for a rotational speed sensor mounted therein via threaded fitting or friction fit and creating a set air gap between an end of the speed sensor and the rotating shaft.