Automatic lubrication device for gear engagement

The utility model belongs to the technical field of gear lubrication, and particularly relates to an automatic lubrication device for gear engagement. The automatic lubrication device for the gear engagement is characterized by comprising a lubrication gear, an oil injection hollow shaft concentric with the lubrication gear and connected with the lubrication gear in rotatable mode, a group of oil guide holes evenly arranged along the circumference of the section of the oil injection hollow shaft, a group of gear teeth arranged along the circumference of the lubrication gear, oil injection oil storage cavities formed in all the gear teeth and communicated with the oil injection hollow shaft, oil injection holes located on all sides of all the gear teeth and located on gear engagement portions, oil block mechanisms arranged in all the gear teeth, and a seal plug and a baffle which are fastened with the lubrication gear. The automatic lubrication device for the gear engagement can guarantee that only gear tooth shoulders meshed with a work gear can inject lubricant into the work gear when the automatic lubrication device for the gear engagement lubricates the work gear, can completely close the oil injection oils in the other gear tooth shoulders of the lubrication gear engaged with the work gear, and thereby guarantees lubrication quality for the work gear.