Patent ID: 9353813
Filing Date: 2016-05-31
CPC Classification: B60T,B66C,E02F,F16D,H02K

Claim Text:
1. A wet brake device comprising: a brake case in which a rotational shaft is rotatably fitted to extend in a vertical direction in the brake case; a plurality of rotating side brake disks arranged outside in a radial direction of said rotational shaft in said brake case and rotating together with said rotational shaft; a plurality of non-rotating side brake disks arranged in a non-rotating state in said brake case while alternately overlapping with each of said rotating side brake disks and opposing said rotating side brake disks in the vertical direction; a brake piston which applies a braking force to said rotational shaft by pressing said rotating side brake disks and said non-rotating side brake disks to frictionally engage with each other; a lubricant oil inlet port provided in said brake case and into which lubricant oil flows toward outer diameter sides of said rotating side brake disks and said non-rotating side brake disks; and a lubricant oil outlet port provided in said brake case and said lubricant oil, which is discharged from inner diameter sides of said rotating side brake disks and said non-rotating side brake disks, flows out from said lubricant oil outlet port in said brake case, wherein one or more of said non-rotating side brake disks respectively includes: wherein one or more of said rotating side brake disks respectively includes: wherein said lubricant oil, flowing into said brake case from said lubricant oil inlet port when a braking force is applied by said brake piston to said rotational shaft, only flows from the outer diameter sides to the inner diameter sides between said rotating side brake disks and said non-rotating side brake disks through said one or more oil grooves, wherein said lubricant oil flowing into said brake case from said lubricant oil inlet port is a part of return oil of operating oil circulating from an operating oil tank in a return line after having driven a hydraulic actuator and is in a pressurized state, wherein a lubricant oil line which makes said return line communicate with said lubricant oil inlet port has a first end connected to said return line on an upstream side of a cooler provided on said return line, and a second end of said lubricant oil line is connected to said lubricant oil inlet port, and wherein said lubricant oil continuously flows from the outer diameter sides to the inner diameter sides between said rotating side brake disks and said non-rotating side brake disks in the pressurized state.