Hybrid PTO Motor Drive with Switchable Equipment Output

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Solution Overview

Problem

Connecting an electric motor to a PTO shaft in a hybrid vehicle prevents the PTO shaft from driving mounted equipment, as it is used to transmit motor drive force, thus losing its original purpose.

Innovation Solution

A motor drive device with a switching mechanism that allows the motor drive force to be selectively transmitted to either the vehicle's PTO shaft or a mounted equipment drive source, such as a hydraulic pump, using a coaxial first and second output shafts and a sleeve mechanism controlled by an actuator.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the motor is connected to the PTO shaft to make the vehicle hybrid, then the motor drive force can be transmitted to the vehicle, but the PTO shaft cannot drive the mounted equipment

Engineering Contradiction:

Improvemotor drive force transmissionVSAvoidPTO shaft function

Core Design Contradiction:

ProductivityVSAdaptability or versatility

Solution Approach 1:

The output shaft is divided into two separate shafts: a first output shaft connected to the PTO shaft for vehicle drive, and a second output shaft connected to the mounted equipment drive source. This segmentation allows independent control and function of each shaft, resolving the conflict between motor drive transmission and PTO shaft versatility.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The switching mechanism enables the motor drive force to be transmitted to either the first output shaft (for vehicle drive) or the second output shaft (for mounted equipment), making the system multi-functional. The same motor can serve multiple purposes through the switching mechanism, maintaining adaptability while improving productivity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If a switching mechanism is added to allow selective connection, then both vehicle drive and mounted equipment drive are enabled, but the device complexity increases

Engineering Contradiction:

Improveoutput shaft switchingVSAvoidswitching mechanism structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

A switching mechanism acts as an intermediary between the motor and the two output shafts. This mediator selectively connects the motor to either the first or second output shaft based on operational needs, enabling adaptability without requiring two separate motors or complex transmission systems.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The switching mechanism is designed to be driven by the motor itself through a switching input shaft, allowing the system to self-switch between modes without requiring external control mechanisms. The motor's own drive force is used to operate the switching mechanism, reducing overall system complexity.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS20260070405A1Motor drive device

Publication Date: 2026.03.12 IJTT CO LTD

AI summary

Even when a motor is connected to a PTO shaft to make a vehicle hybrid, it is possible to drive a mounted equipment. A motor drive device 100 for outputting motor drive force for a hybrid vehicle includes a motor 21; a first output shaft 22 configured to be connected to a PTO shaft for extracting engine drive force from the hybrid vehicle; a power transmission mechanism 23 connecting the motor and the first output shaft; a second output shaft 24 configured to be connected to a drive source 11 for a mounted equipment on the hybrid vehicle; and a switching mechanism 25 configured to selectively connect the first output shaft to the second output shaft.