Transmission Catch Tank Partitioning for Stable Oil Supply

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Solution Overview

Problem

Lubricating devices in vehicle transmission systems face challenges in supplying an appropriate amount of oil to lubrication-requiring parts when the oil surface in the catch tank tilts due to vehicle tilt or centrifugal force during vehicle turns.

Innovation Solution

A lubricating device with a catch tank shaped elongated in the vehicle front-rear direction, featuring a partition wall dividing the tank in the vehicle width direction and inclined parts on the sides to retain oil, ensuring even distribution and supply through lubrication holes even when the oil surface tilts.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional catch tank structure is used, then the structure is simple, but the oil supply becomes insufficient when the oil surface tilts during vehicle turns or tilt

Engineering Contradiction:
Improveoil supply reliabilityVSAvoidcatch tank structure complexity
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The catch tank is divided into multiple oil storage spaces by partition walls, with each space having dedicated lubrication holes. This segmentation ensures that oil is supplied reliably to different regions even when the oil surface tilts during vehicle operation, resolving the contradiction between reliability and complexity by organizing the tank into functional zones.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

Different regions of the catch tank are designed with different characteristics - some spaces have inclined parts for oil retention, others have direct oil flow paths. The partition walls create zones with different oil supply mechanisms, allowing each local area to be optimized for its specific function while maintaining overall system reliability.

Inventive Principle:
Principle #3Local quality

2Volume of moving object

If the catch tank size is reduced, then the device becomes more compact, but the oil retention capability during vehicle turns deteriorates

Engineering Contradiction:
Improvecatch tank volumeVSAvoidoil retention capability
Core Design Contradiction:
Volume of moving objectVSReliability

Solution Approach 1:

By dividing the catch tank into multiple smaller oil storage spaces using partition walls, the design achieves better oil retention in a compact volume. Each segmented space with its inclined parts and dedicated lubrication holes maintains effective oil supply despite the reduced overall tank size, resolving the contradiction between compactness and retention capability.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The partition walls extend in the vehicle width direction, creating a three-dimensional segmented structure within the compact tank volume. This dimensional organization allows efficient use of space while maintaining oil retention through inclined surfaces and controlled flow paths in each segment.

Inventive Principle:
Principle #17Another dimension (Dimensionality change)

3Stability of the object's composition

If partition walls are added to divide the catch tank, then oil distribution becomes more even, but the manufacturing complexity increases

Engineering Contradiction:
Improveoil distribution uniformityVSAvoidcatch tank manufacturing ease
Core Design Contradiction:
Stability of the object's compositionVSEase of manufacture

Solution Approach 1:

The partition walls create distinct oil storage spaces that ensure even oil distribution to different lubrication points. While this segmentation does increase manufacturing steps, the modular design allows for standardized production of tank sections that can be assembled together, making the manufacturing process more manageable despite the added complexity.

Inventive Principle:
Principle #1Segmentation

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

The solution effectively prevents uneven oil flow and ensures consistent oil supply to lubrication-requiring parts, maintaining lubrication performance and allowing for a reduced catch tank size.

Implementation Method 1

when the oil surface in the catch tank tilts due to tilt of the vehicle or a centrifugal force applied during turn of the vehicle

Methodology Applied
Scientific EffectCentrifugal force: Centrifugal Force

Implementation Method 2

an inclined part that is inclined vertically downward while extending away from the partition wall in the vehicle width direction is formed

Methodology Applied
Scientific EffectGravity: Gravitation

Data Source

PatentUS12055210B2Lubricating device of vehicle transmission system
Publication Date: 2024.08.06 TOYOTA JIDOSHA KK
  • US12055210B2 patent drawing
  • US12055210B2 patent drawing
  • US12055210B2 patent drawing

AI summary

In a catch tank, a partition wall is formed that extends along a vehicle front-rear direction and divides the catch tank in a vehicle width direction in a vehicle-mounted state, which helps prevent oil in the catch tank from flowing unevenly to one of a first space and a second space even when the oil surface of the oil tilts during turn of the vehicle, for example. As a result, an appropriate amount of oil required for lubrication is supplied through a second lubrication hole regardless of tilt of the vehicle or turn of the vehicle.