Transmission Control Mounting with Stepped-Groove Blind Assembly
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Solution Overview
Problem
The development of new power sources in vehicles, such as electric machines, often results in limited space for accommodating the powertrain, making it challenging to mount control devices safely and reliably to the transmission housing without damaging components.
Innovation Solution
A transmission assembly design featuring a control device with a transmission mounting surface and a transmission housing with corresponding grooves and guiding members, allowing for a blind assembly operation that prevents contact between mounting surfaces, and optionally includes sealing means and auxiliary guiding members for enhanced reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the control device is mounted directly to the transmission housing with conventional mounting surfaces, then the assembly process requires precise alignment and visual monitoring, but this increases the complexity of the mounting operation and risks damaging components in restricted spaces
Solution Approach 1:
The groove with steps is pre-formed in the transmission housing, and the guiding member is pre-configured on the control device. During assembly, the guiding member automatically engages with the groove and slides along the predefined path, performing the alignment action before the final mounting contact is made. This eliminates the need for visual monitoring during alignment while ensuring safe component engagement.
2Volume of moving object
If the transmission assembly is made more compact to accommodate limited vehicle space, then space efficiency improves, but the mounting operation becomes more difficult and risky in restricted spaces
Solution Approach 1:
The guiding member and groove configuration enables the control device to self-align and self-guide during mounting. The stepped groove structure provides automatic positioning feedback, allowing the assembly to complete alignment without external intervention or visual monitoring, which is particularly beneficial in compact configurations where access is restricted.
3Device complexity
If conventional mounting surfaces are used without protective features, then the mounting process is simpler in design, but sealing means and other components are at risk of damage during assembly
Solution Approach 1:
The stepped groove structure creates a protective intermediate zone during the mounting process. The first step acts as a cushioning region that receives the guiding member before final engagement, preventing direct impact between the control device and transmission housing. This beforehand protective structure safeguards sealing means and other sensitive components from assembly-related damage.
Data Source
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AI summary
The disclosure relates to a transmission assembly (10) for a powertrain (3) of a vehicle (100), comprising, a control device (1) and a transmission housing (12) for housing a transmission (2), wherein the control device is mountable to the transmission housing, the control device comprising a transmission mounting surface(4) adapted to face the transmission housing when mounted thereto, the transmission housing comprising a corresponding control device mounting surface (121) adapted to face the control device when the control device is mounted to the transmission housing, wherein, one of the transmission mounting surface and the control device mounting surface comprises at least one groove (41), which groove comprises at least a first and a second step (411, 412), as seen in a direction being perpendicular to the one of the transmission mounting surface and the control device mounting surface, wherein the second step is deeper than the first step, and the other one of the transmission mounting surface and the control device mounting surface comprises at least one outwardly extending guiding member(1211),such as a pin, which is configured to be received in the groove, and wherein the outwardly extending guiding member and the groove are configured so that the outwardly extending guiding member can slide in the first step until it reaches the second step, whereafter the transmission mounting surface can be moved towards the control device mounting surface or vice versa.The disclosure further relates to a powertrain, a vehicle and to a method.