Transmission Blocking Actuator With External Drive and Oil Isolation
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Solution Overview
Problem
Existing transmission blocking devices for vehicles, particularly in electric vehicles, face challenges such as high technical complexity, cost, and lack of robustness due to the need for oil-resistant and temperature-resistant components, and reliance on hydraulic pressure, which is not available in electric vehicle drives. Additionally, they often require installation space that is not available and lack reliable position detection and redundant energy supply.
Innovation Solution
An electromechanical drive system is used, where the actuating mechanism is within the transmission space filled with oil, and the drive, including an electric motor, is outside, eliminating the need for oil resistance and hydraulic supply. The electric motor is robust and inexpensive, with the drive shaft sealed through the transmission wall, and a position encoder, preferably a magnet, provides absolute position detection without requiring oil-resistant designs. The system includes an emergency drive for secure engagement even in power failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydraulic actuation with compressed oil supply is used, then the transmission blocking device can be actuated reliably, but the technical complexity and cost increase due to oil-resistant and temperature-resistant components
Solution Approach 1:
The drive unit is extracted from the oil-filled transmission interior and mounted externally on the transmission housing. This allows the use of standard electric motors without oil-resistant design, eliminating the need for complex sealed connectors and oil-resistant components while maintaining reliable actuation through the sealed drive shaft connection
Solution Approach 2:
A sealed drive shaft connection through the transmission wall acts as an intermediary between the external drive unit and the internal actuating mechanism. This intermediary enables power transmission while maintaining the separation between oil-filled and non-oil-filled environments, resolving the contradiction between reliability and complexity
2Area of stationary object
If the drive is arranged inside the transmission space filled with oil, then the installation space is utilized, but the components require oil-resistant and temperature-resistant design which increases cost and reduces robustness
Solution Approach 1:
The drive unit is extracted from the oil-filled transmission interior and mounted externally on the transmission housing. This allows the use of standard electric motors without oil-resistant design, eliminating the need for complex sealed connectors and oil-resistant components while maintaining reliable actuation through the sealed drive shaft connection
Solution Approach 2:
The drive unit is relocated from the two-dimensional interior space to the external surface of the transmission housing. This dimensional shift allows standard components to be used while still achieving compact integration through the sealed connection to the internal actuating mechanism
3Ease of operation
If electric connectors are routed through the transmission wall into the oil-filled space, then the drive can be connected, but the connectors require sealed routing which increases technical complexity and cost
Solution Approach 1:
The drive unit is extracted from the oil-filled transmission interior and mounted externally on the transmission housing. This allows the use of standard electric motors without oil-resistant design, eliminating the need for complex sealed connectors and oil-resistant components while maintaining reliable actuation through the sealed drive shaft connection
4Ease of operation
If hydraulic compressed oil supply is used for actuation, then the transmission blocking device can be actuated, but it is not available in electric vehicle drives
Solution Approach 1:
The hydraulic actuation system is replaced with an electromechanical drive unit. The electric motor with sealed drive shaft connection directly drives the actuating mechanism, eliminating the need for hydraulic compressed oil supply and making the system compatible with electric vehicle drives while maintaining full actuation capability
Solution Approach 2:
A sealed drive shaft connection through the transmission wall acts as an intermediary between the external drive unit and the internal actuating mechanism. This intermediary enables power transmission while maintaining the separation between oil-filled and non-oil-filled environments, resolving the contradiction between reliability and complexity
Data Source
AI summary
The present invention relates to a device for blocking a transmission comprising an actuation mechanism, which is arranged inside the transmission in an at least partially oil-filled transmission chamber, and a drive of the actuation mechanism, wherein the drive is arranged outside of the at least partially oil-filled transmission chamber.