Cab Rear Space Accommodating Box for Compact Hydraulic Excavator
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Solution Overview
Problem
In ultra small-sized hydraulic excavators, the limited space due to a cab covering most of the upper side of the revolving frame makes it difficult to securely arrange an accommodating box without compromising operator working space and visibility.
Innovation Solution
A configuration where the accommodating box is mounted to the rear mounting member of the cab, utilizing the space formed behind the seat, with a partition member and platform member arrangement that maintains operator space and visibility, and includes a lid body with a notch for easy access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a cab is provided in an ultra small-sized hydraulic excavator, then operator protection and comfort are improved, but the available space for accommodating box arrangement deteriorates
Solution Approach 1:
The accommodating box is positioned in the depth direction (front-rear axis) of the cab rather than occupying lateral or vertical space. The box is arranged in the front side of the cab in the depth direction, utilizing the longitudinal space that would otherwise be unused, thereby preserving operator working space while providing protection.
Solution Approach 2:
The cab interior space is segmented into distinct functional zones: the operator working space at the rear, and the accommodating box space at the front. This segmentation allows both functions to coexist without interfering with each other, maintaining operator comfort while providing equipment storage.
2Quantity of substance
If an accommodating box is arranged on the revolving frame, then equipment storage is improved, but operator working space and visibility deteriorate
Solution Approach 1:
The accommodating box is merged with the cab structure itself, forming an integrated unit where the box serves as part of the cab's internal configuration. This eliminates the need for separate external mounting structures that would encroach on operator space, while still providing adequate equipment storage capacity.
3Object-affected harmful factors
If the cab covers the upper side of the revolving frame, then operator protection is improved, but space for accommodating box arrangement deteriorates
Solution Approach 1:
Instead of seeking vertical or lateral space that would be covered by the cab, the accommodating box utilizes the depth dimension (front-rear direction) of the cab. The box is positioned in the front side of the cab along the longitudinal axis, effectively using three-dimensional space that does not interfere with operator working volume or visibility.
Data Source
Figure 1
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Figure 3
AI summary
An upper revolving structure (3) includes: a revolving frame (5); a counterweight (6); an engine (7); a support member (9) provided on the revolving frame (5) so as to extend over the engine (7); a partition member (11) mounted to the revolving frame (5), and a support base (9E) of the support member (9); a platform member (14) provided in between the revolving frame (5) and the partition member (11); a footrest member (16) positioned in a front side of the platform member (14) and provided in the revolving frame (5); the partition member (11); and a cab (21) that covers an upper side of the platform member (14) and the footrest member (16). A rear mounting member (28) mounted to the support base (9E) of the support member (9) is provided in a rear end lower side of the cab (21). An accommodating box (37) is provided in the rear mounting member (28) so as to be positioned in a rear side of a seat (17) in the cab (21).