YJ type one-way shock absorber (bumper)effectively absorbs and reduces shock and vibration in the drill stem by means of elastic deforming of the hydraulic oil under external force.  The anti-coagulation produced from hydrualic oil under the  outside  force. Thanks to the simple structure of the YJ type one-way shock absorber(bumper), It makes the reliable working performance  count and be easy to maintian the absorb shocking and the viberate load from the drill sting during the operation. Using of the shock absorber, therefore, takes advange in maintianing the stability of drill stem and  drill bit.

 YJ type one-way shock absorber (bumper)is a kind of hydralic shock absorber (bumper). which is connected between drill bit and drill collar. the torque is transferred from the top of drillstring to the mandral. The spine transfer torque to spline outer barrel,oil cylinder and lower sub then drive drill bit to rotate. 

YJ type one-way shock absorber