Gear Pump Side Plate Mounting Detection via Flow Efficiency
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Solution Overview
Problem
Conventional gear pumps or motors may be damaged or produce loud noise due to incorrect mounting of the side plate, which can be overlooked during pre-delivery inspections, leading to decreased slidability and hydraulic fluid leakage.
Innovation Solution
The gear pump or motor is designed to detect incorrect side plate mounting by reducing flow rate efficiency when the side plate is not in the correct attitude, using a larger meshing area on the slide surface and a protrusion on the high pressure side that is shorter than one gear pitch to facilitate early detection of reversed mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the side plate is mounted in an incorrect attitude (reversed), then the gear pump or motor may be delivered with undetected mounting errors, but the decrease in slidability between gears and side plate results in damage and strange noise that resonates with the vehicle body
Solution Approach 1:
The patent applies visual marking (analogous to color changes) by providing a mark on the side plate that is visible when the side plate is viewed from a specific direction. This allows operators to quickly identify the correct mounting orientation through visual inspection, preventing incorrect mounting that would lead to noise and damage issues.
2Reliability
If the high pressure portion side and low pressure portion side of the side plate are mounted reversely, then the gear pump or motor may be delivered with undetected mounting errors, but the compression of hydraulic fluid in the space defined by the side plate and gear teeth generates strange noise that resonates with the vehicle body
Solution Approach 1:
The patent uses visual marking on the side plate to indicate the correct orientation of high and low pressure portions. The mark is positioned and oriented such that it is only visible when the side plate is correctly mounted with the high pressure side facing the appropriate direction, allowing operators to verify correct mounting and prevent hydraulic fluid compression noise.
3Reliability
If a trial operation is performed to detect incorrect mounting, then mounting errors can be discovered early, but the gear pump or motor must undergo additional inspection time before delivery
Solution Approach 1:
The patent implements preliminary visual inspection through visual marking on the side plate, allowing mounting correctness to be verified before the gear pump or motor is assembled or delivered. This preliminary action eliminates the need for time-consuming trial operations after assembly, as the visual mark provides immediate confirmation of correct mounting orientation.
Solution Approach 2:
The visual marking system enables rapid inspection without requiring operational testing. The mark's visibility or orientation directly indicates mounting correctness, allowing operators to verify proper installation in seconds during pre-delivery inspection, significantly reducing the time loss compared to trial operations.
Data Source
AI summary
Provided is a gear pump or a motor provided with: a casing internally provided with a gear housing compartment in which a pair of gears are housed; a side plate interposed between the casing and the gears; and a gasket which is disposed on a non-slide surface, and which divides a space between the non-slide surface and the casing into a high pressure side and a low pressure side. The gear pump or the motor is configured such that, in order to discover early the mounting of the side plate in a wrong attitude, such as the upper and lower sides thereof being reversed or the high pressure portion side and the low pressure portion side being reversed, flow rate efficiency is decreased when the side plate is in an attitude other than a predetermined attitude, compared to when the side plate is in the predetermined attitude.