PSC Hydro Assist Mounted to Pitman arm
04-19-2017, 06:48 PM
#1
JK Newbie
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PSC Hydro Assist Mounted to Pitman arm
So I was watching an EVO build video on the Tube and came across something that I haven't seen before...Most of use mount our PSC or hydro-assist ram from our trackbar bracket or diff cover to the tie rod...Well from the picture I see, EVO mounted the ram to the frame to the Pitman arm using some double shear or heim joint setup... Is this something that is custom? seems like it would definatly keep the ram out of our way! Anyone have input on this???
04-19-2017, 07:10 PM
#3
Not sure if actual ram housing failures from being down low are a common occurrence.
Main advantage I see from running it in the pictures posted is that you would at least keep the hydraulic lines out of the way from being snagged on, etc.
Plus that ram looks to be mounted single shear on both ends. I'd prefer double shear on both ends.
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Main advantage I see from running it in the pictures posted is that you would at least keep the hydraulic lines out of the way from being snagged on, etc.
Plus that ram looks to be mounted single shear on both ends. I'd prefer double shear on both ends.
.
04-19-2017, 07:23 PM
#4
....also with one end stuffed (other side drooped), you lose the efficiency of the ram being mounted at the tie rod. When mounted at the tie-rod, you are applying a force vector in the same direction of the tie rod. For simplicity's sake, if the tie-rod equates to the x-axis direction, force in this manner will always be applied by the ram in the x-axis direction also. Because no y-component is introduced at the tie-rod, the force applied by the ram is the most efficient.
Where as in the pictures posted, once one side is stuffed and you are trying to turn, you are now dealing with x + y component force vectors to an angled draglink = less efficiency.
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Where as in the pictures posted, once one side is stuffed and you are trying to turn, you are now dealing with x + y component force vectors to an angled draglink = less efficiency.
.
04-19-2017, 08:33 PM
#5
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Not sure if actual ram housing failures from being down low are a common occurrence.
Main advantage I see from running it in the pictures posted is that you would at least keep the hydraulic lines out of the way from being snagged on, etc.
Plus that ram looks to be mounted single shear on both ends. I'd prefer double shear on both ends.
.
Main advantage I see from running it in the pictures posted is that you would at least keep the hydraulic lines out of the way from being snagged on, etc.
Plus that ram looks to be mounted single shear on both ends. I'd prefer double shear on both ends.
.
04-20-2017, 05:19 AM
#6
....also with one end stuffed (other side drooped), you lose the efficiency of the ram being mounted at the tie rod. When mounted at the tie-rod, you are applying a force vector in the same direction of the tie rod. For simplicity's sake, if the tie-rod equates to the x-axis direction, force in this manner will always be applied by the ram in the x-axis direction also. Because no y-component is introduced at the tie-rod, the force applied by the ram is the most efficient.
Where as in the pictures posted, once one side is stuffed and you are trying to turn, you are now dealing with x + y component force vectors to an angled draglink = less efficiency.
.
Where as in the pictures posted, once one side is stuffed and you are trying to turn, you are now dealing with x + y component force vectors to an angled draglink = less efficiency.
.
There is no y axis component as the ram is mounted to a bolt running though the pitman arm and not onto the draglink itself. The ram will only move in an x axis direction on an arc following the same path as the pitman arm
04-20-2017, 10:16 AM
#7
....and what of the force that's translated to the pitman arm onto a drooped draglink that's applying force to the draglink end at the steering knuckle??? That is a y-component.....
If the draglink never droops and stays perfectly parallel to the axle as with the tie-rod, then the force applied through the pitman arm to the draglink would be the most efficient. But the draglink does droop and as a result, any force being applied to a drooped draglink will always be less efficient due to the y-component.
It's no different than pushing a 150lb refrigerator by yourself. You can either extend your arms straight out and push (most efficient) or you can try pushing that same refrigerator with your arms extended 45 degrees above your head. Physics 101.
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04-21-2017, 05:20 AM
#8
....and what of the force that's translated to the pitman arm onto a drooped draglink that's applying force to the draglink end at the steering knuckle??? That is a y-component.....
If the draglink never droops and stays perfectly parallel to the axle as with the tie-rod, then the force applied through the pitman arm to the draglink would be the most efficient. But the draglink does droop and as a result, any force being applied to a drooped draglink will always be less efficient due to the y-component.
It's no different than pushing a 150lb refrigerator by yourself. You can either extend your arms straight out and push (most efficient) or you can try pushing that same refrigerator with your arms extended 45 degrees above your head. Physics 101.
.
If the draglink never droops and stays perfectly parallel to the axle as with the tie-rod, then the force applied through the pitman arm to the draglink would be the most efficient. But the draglink does droop and as a result, any force being applied to a drooped draglink will always be less efficient due to the y-component.
It's no different than pushing a 150lb refrigerator by yourself. You can either extend your arms straight out and push (most efficient) or you can try pushing that same refrigerator with your arms extended 45 degrees above your head. Physics 101.
.
04-21-2017, 05:38 AM
#9
JK Super Freak
The ram sits above the pitman arm which only rotates in one plane. The draglink sits below the pitman arm and in this case is on a heim which allows the draglink to move in a y axis as the axle travels up and down. The pitman arm and the ram above it do not travel in a y axis and ram is exerting force on the pitman arm.
Think instead about the drag link end at the pitman arm. Don't you see how the ram being mounted up high doesn't protect the drag link from bending? Mounted on the axle the ram exerts almost all its force into steering the knuckles via the tie rod. On the pitman arm a lot of the rams force wants to bend the drag link it isn't pushing in the same plane as the knuckles.
Look at this pic and decide is the ram better pushing the tie rod or the pitman arm:
04-21-2017, 05:55 AM
#10
You are focused on the ram and pitman arm. The steering is a system of parts and they are all stressed after the ram. Every part after the ram gets stressed by steering forces.
Think instead about the drag link end at the pitman arm. Don't you see how the ram being mounted up high doesn't protect the drag link from bending? Mounted on the axle the ram exerts almost all its force into steering the knuckles via the tie rod. On the pitman arm a lot of the rams force wants to bend the drag link it isn't pushing in the same plane as the knuckles.
Look at this pic and decide is the ram better pushing the tie rod or the pitman arm:
Think instead about the drag link end at the pitman arm. Don't you see how the ram being mounted up high doesn't protect the drag link from bending? Mounted on the axle the ram exerts almost all its force into steering the knuckles via the tie rod. On the pitman arm a lot of the rams force wants to bend the drag link it isn't pushing in the same plane as the knuckles.
Look at this pic and decide is the ram better pushing the tie rod or the pitman arm:
In your particular picture, the ram is mounted at an angle to the tie rod which is whole other can of worms...