Cab Antenna Bracket Layout for Compact Work Machines

Solution Overview

Problem

The existing work machines with multiple antennas mounted using a cab guard covering the entire cabin hinder weight reduction and size minimization.

Innovation Solution

The work machine features a first and second antenna disposed on the occupant unit, supported by separate brackets, allowing for a compact and efficient mounting structure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a cab guard covering the entire upper portion of the cabin is used to mount multiple antennas, then the antennas can be securely mounted with good reception sensitivity, but the mounting structure becomes large and heavy

Engineering Contradiction:

Improveantenna reception sensitivityVSAvoidmounting structure weight

Core Design Contradiction:

ReliabilityVSWeight of stationary object

Solution Approach 1:

The patent divides the single cab guard structure into multiple separate mounting brackets positioned at different locations on the cabin. Each bracket independently mounts one or more antennas, eliminating the need for a large continuous guard structure while maintaining secure antenna mounting and good reception sensitivity.

Inventive Principle:

Principle #1Segmentation

2Reliability

If a cab guard covering the entire upper portion of the cabin is used to mount multiple antennas, then the antennas can be securely mounted with good reception sensitivity, but the mounting structure becomes large in size

Engineering Contradiction:

Improveantenna reception sensitivityVSAvoidmounting structure area

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The patent divides the single cab guard structure into multiple separate mounting brackets positioned at different locations on the cabin. Each bracket independently mounts one or more antennas, eliminating the need for a large continuous guard structure while maintaining secure antenna mounting and good reception sensitivity.

Inventive Principle:

Principle #1Segmentation

3Volume of moving object

If antennas are mounted close to the work implement, then the machine can be more compact, but the antenna closer to the work implement has lower reception sensitivity due to interference

Engineering Contradiction:

Improvemachine sizeVSAvoidantenna reception sensitivity

Core Design Contradiction:

Volume of moving objectVSReliability

Solution Approach 1:

The patent places antennas at different heights vertically, with the first antenna higher than the second antenna. This vertical stratification allows antennas to be positioned closer to the work implement while maintaining good reception sensitivity by reducing interference through height differentiation, thus enabling a more compact machine design.

Inventive Principle:

Principle #3Local quality

Data Source

PatentEP4647556A1Work machine

Publication Date: 2025.11.12 YANMAR HLDG CO LTD

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AI summary

[Problem] To provide a work machine having an improved antenna mounting structure. [Solution] A work machine 3 includes a machine body 30, a first antenna 11 and a second antenna 12, a first bracket 51, and a second bracket 52. The machine body 30 includes an occupant unit 4 capable of accommodating an occupant. The first antenna 11 and the second antenna 12 are disposed on the occupant unit 4 to be separated from each other in plan view. The first bracket 51 is supported by the occupant unit 4 and supports the first antenna 11. The second bracket 52 is provided separately from the first bracket 51, is supported by the occupant unit 4, and supports the second antenna 12.