Patent ID: 8678137

Claim:
A lubrication monitoring system for monitoring the lubricative state of two relatively movable elements of a linear transmission device, comprising: a contact resistance capturing device having at least two connection ends connected with the two relatively movable elements for detecting contact resistance therebetween and outputting a corresponding value according to the contact resistance; and a processing unit being electrically connected with the contact resistance capturing device, a maximum delay time and a threshold value being preset in the processing unit, the maximum delay time indicating a period of acceleration during which the linear transmission device starts to run and accelerates to reach a constant speed; wherein the contact resistance capturing device is configured to, while the linear transmission device starts to run, detect the contact resistance alternately and output the corresponding value; wherein the processing unit is configured to determine a delay time according to a period of time from a first time when the linear transmission device starts to run to a second time when the corresponding value reaches a threshold value, and; wherein the processing unit is configured to determine if the specific value of the delay time to the maximum delay time is larger than or equal to a predetermined one, and if the specific value of the delay time to the maximum delay time is larger than or equal to a predetermined one, to judge that the lubrication resupply is needed and to emit a lubrication resupply signal.