Transaxle Parking Lock Using Electric Pump Motor Drive

Solution Overview

Problem

Conventional parking locking mechanisms in vehicles are inconvenient for drivers and face challenges in cost reduction and space saving due to the additional installation of a drive source, such as a motor, for electrically moving rotation prevention members.

Innovation Solution

A gearbox with a parking gear portion and a rotation prevention member that can move between positions to prevent rotation, utilizing an electric pump and transmission mechanism to transmit the motor shaft's driving force to the rotation prevention member, allowing for electrically powered parking brake operation without the need for additional drive sources.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a manual parking locking mechanism is used, then the structure is simple, but driver convenience deteriorates

Engineering Contradiction:

Improvestructure simplicityVSAvoiddriver convenience

Core Design Contradiction:

Device complexityVSEase of operation

Solution Approach 1:

The motor shaft serves multiple functions: it provides driving force to the gears during vehicle operation and simultaneously acts as the drive source for the parking locking mechanism. The transmission mechanism transmits this same driving force to both the gear system and the rotation prevention member, eliminating the need for a separate motor while providing both vehicle propulsion and parking locking functionality.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Ease of operation

If an additional motor is installed for electric parking locking, then driver convenience improves, but cost and space increase

Engineering Contradiction:

Improvedriver convenienceVSAvoidcost and space

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The motor shaft serves multiple functions: it provides driving force to the gears during vehicle operation and simultaneously acts as the drive source for the parking locking mechanism. The transmission mechanism transmits this same driving force to both the gear system and the rotation prevention member, eliminating the need for a separate motor while providing both vehicle propulsion and parking locking functionality.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The motor shaft itself serves as the power source for the parking locking mechanism, utilizing its own rotational energy without requiring an external motor. The transmission mechanism enables the motor shaft to self-power the rotation prevention member, making the system self-sufficient and eliminating additional cost and space requirements.

Inventive Principle:

Principle #25Self-service

3Extent of automation

If an additional motor is installed for electric parking locking, then parking locking automation improves, but device complexity increases

Engineering Contradiction:

Improveparking locking automationVSAvoidnumber of components

Core Design Contradiction:

Extent of automationVSDevice complexity

Solution Approach 1:

The motor shaft serves multiple functions: it provides driving force to the gears during vehicle operation and simultaneously acts as the drive source for the parking locking mechanism. The transmission mechanism transmits this same driving force to both the gear system and the rotation prevention member, eliminating the need for a separate motor while providing both vehicle propulsion and parking locking functionality.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The motor shaft itself serves as the power source for the parking locking mechanism, utilizing its own rotational energy without requiring an external motor. The transmission mechanism enables the motor shaft to self-power the rotation prevention member, making the system self-sufficient and eliminating additional cost and space requirements.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS11313450B2Gearbox and motor driver

Publication Date: 2022.04.26 NIDEC TOSOK CORP

AI summary

The disclosure reduces inconvenience for a driver at the time of operating parking locking, thereby curbing cost reduction and space saving becoming difficult due to additional installation of a drive source for parking locking. The disclosure provides a motor driver mounted on a vehicle, including a rotation prevention arm which can move between a position where it is interposed between teeth of a parking gear portion to prevent rotation of a second gear thereby preventing rotation of each gear in a transaxle and a position where it is not interposed between the teeth, and a transmission mechanism which transmits a driving force of a motor shaft of an electric pump for transferring oil in a housing of the transaxle to the rotation prevention arm.