I just saw the video and in one direction all 4 locks work and in the other only 2 maybe this why there is less pull on this stroke. Greetings from Marine repairs and salvage, inc. in Panama.
Great question! It's probably due to the properties of the hydraulic cylinder. Inside the cylinder there is a piston that the working fluid pushes on. The force of the cylinder is the product of the pressure times the area. So say for a 200 (~3,000 psi) bar working pressure and a piston area of 200 cm^2 (~31 in^2) then the force is 400,000 Newtons (~90,000 lbs) of force. On the return stroke, the rod (the chrome bit) takes up some of the area inside the cylinder and thus the effective piston area is considerably smaller and therefore less force can be exerted. I hope this helps.
The reason is because all hydraulic cylinders have less force with retraction than they do pushing out. This has to do with the fact that there is less surface area inside the bore on the rod end of the cylinder, due to the space the rod takes up. The amount of force a cylinder can apply is based on inside surface area times psi of the hydraulic oil. Less surface area on the rod end equates to quite a bit less pulling force compared to pushing.
Why is it that when on the pulling stroke capacity is reduced?
I just saw the video and in one direction all 4 locks work and in the other only 2 maybe this why there is less pull on this stroke. Greetings from Marine repairs and salvage, inc. in Panama.
Great question! It's probably due to the properties of the hydraulic cylinder. Inside the cylinder there is a piston that the working fluid pushes on. The force of the cylinder is the product of the pressure times the area. So say for a 200 (~3,000 psi) bar working pressure and a piston area of 200 cm^2 (~31 in^2) then the force is 400,000 Newtons (~90,000 lbs) of force. On the return stroke, the rod (the chrome bit) takes up some of the area inside the cylinder and thus the effective piston area is considerably smaller and therefore less force can be exerted.
I hope this helps.
The reason is because all hydraulic cylinders have less force with retraction than they do pushing out. This has to do with the fact that there is less surface area inside the bore on the rod end of the cylinder, due to the space the rod takes up. The amount of force a cylinder can apply is based on inside surface area times psi of the hydraulic oil. Less surface area on the rod end equates to quite a bit less pulling force compared to pushing.
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