Lubrication monitoring system

Patent metadata

Field	Value
Publication number	US-12589517-B2
Application number	US-202218729675-A
Country	US
Kind code	B2
Filing date	Dec 12, 2022
Priority date	Jan 21, 2022
Publication date	Mar 31, 2026
Grant date	Mar 31, 2026

Abstract

The present disclosure relates to a lubrication monitoring system ( 15 ) configured to monitor a supply of lubricant in a hand-held cutting tool ( 1 ) having a cutting unit ( 3, 5 ). A lubricant tank ( 41 ) and a conduit ( 45 ) are configured to duct a flow of lubricant from the tank ( 41 ) to the cutting unit ( 3, 5 ). The lubrication monitoring system ( 15 ) comprises a heating element ( 29 ) and a sensor arrangement ( 31, 33 ), the heating element ( 29 ) being configured to heat the lubricant flow. The sensor arrangement comprises a first sensor ( 31 ) located at the flow, upstream of the heating element ( 29 ), and a second sensor ( 33 ) located at said flow, downstream of the heating element. The lubrication monitoring system outputs a monitoring signal based on a sensed temperature difference between the first and second sensors ( 31, 33 ).

First claim

The invention claimed is:

1 . A lubrication monitoring arrangement configured to monitor a supply of lubricant in a hand-held cutting tool having a cutting unit, a lubricant tank and a conduit configured to duct a flow of lubricant from the tank to the cutting unit, wherein the lubrication monitoring arrangement comprises a heating element and a sensor arrangement, the heating element being configured to heat said flow, wherein the sensor arrangement comprises a first sensor located at said flow, upstream of the heating element, and a second sensor located at said flow, downstream of the heating element, wherein the lubrication monitoring arrangement outputs a monitoring signal based on a sensed temperature difference between the first and the second sensor, and
wherein the lubrication monitoring arrangement comprises a sensor container forming a lubricant flow channel from an input to an output and a circuit board fitted inside the sensor container and carrying said heating element and said first and second sensors, reaching into the flow channel.

2 . The lubrication monitoring arrangement according to claim 1 , wherein the sensor container further comprises a connector channel, separate from the flow channel, where cables connecting to the circuit board run.

3 . The lubrication monitoring arrangement according to claim 1 , wherein the sensor container is sealed on top of the circuit board by a molded resin.

4 . The lubrication monitoring arrangement according to claim 1 , wherein the first and second sensors are NTC resistors.

5 . A battery-operated chainsaw comprising the lubrication monitoring arrangement according to claim 1 .

Assignees

• Husqvarna Ab

Inventors

• Krantz Jacob
• Samefors Joakim

Classifications

• F16N2250/08

  Temperature · CPC title

• F16N2210/33

  Chains · CPC title

• F16N29/02 Primary

  for influencing the supply of lubricant · CPC title

• B23Q11/12

  Arrangements for cooling or lubricating parts of the machine (B23Q11/14 takes precedence {; movable work or tool supports using fluid bearings or fluid cushion supports B23Q1/38; cooling or lubricating means used in the working area B23Q11/10}) · CPC title

• B23D59/04

  Devices for lubricating or cooling straight or strap saw blades · CPC title