- #1
ydeardorff
- 22
- 0
Hello to all,
I am not a mechanical engineer, I am a jack of trades though.
I am trying to solve a problem I see in a design an need your help to design a system for a lifting canopy on a car, the functions better than the current one.
Currently, the lifting system on this car, is constructed of two pieces of U channel with two bars mounted in the same channel. These bars and U channel act as the lifting hinge for the canopy of this car. The system is powered typically by a convertible car hydraulic pump, and two hydraulic rams connected directly to one of the arms.
See this video for an idea of the system:
However there are a few problems with its design.
The system is powered hydraulically. it is held up by hydraulic pressure, and held down the same way.
The roof will wriggle loose while driving in the down position.
The speed at which the roof opens and closes is appalling. sometimes more than 20 seconds to open it.
The goal, is to make a simple to make, multi-link system, to gain faster opening, and closing, a hydraulic timer to add in a 6 inch creep phase at the end of the stroke up or down, to prevent slamming at the end of the stroke. Also, using the cheapest parts available is preferred. The stroke is about 8 inches at the connection point shown in the video.
Some sort of cantilever arm link to create an over center mechanical lock to lock the top down is needed. Manufacturing these parts by hand is fine. Buying them is ok. But components bought off the shelf are very expensive for this system to make it fast. I am looking for an alternative cheaper way to make this happen more efficiently.
Im hoping you guys/gals would like a challenge and are willing to help.
If you need any more info I will get it to you as soon as I can.
Everytime I try to figure out how to make this system gain more mechanical advantage, and speed ends up equalizing each other out. I am not sure what I am missing. I even broke out my kids erector set to play with various mounting points to no avail.
Im looking at making the system internal below the body work (minus the bar hinge) so the actuator and all the links would be inside the body if possible.Thank you for your time.
ydeardorff
I am not a mechanical engineer, I am a jack of trades though.
I am trying to solve a problem I see in a design an need your help to design a system for a lifting canopy on a car, the functions better than the current one.
Currently, the lifting system on this car, is constructed of two pieces of U channel with two bars mounted in the same channel. These bars and U channel act as the lifting hinge for the canopy of this car. The system is powered typically by a convertible car hydraulic pump, and two hydraulic rams connected directly to one of the arms.
See this video for an idea of the system:
However there are a few problems with its design.
The system is powered hydraulically. it is held up by hydraulic pressure, and held down the same way.
The roof will wriggle loose while driving in the down position.
The speed at which the roof opens and closes is appalling. sometimes more than 20 seconds to open it.
The goal, is to make a simple to make, multi-link system, to gain faster opening, and closing, a hydraulic timer to add in a 6 inch creep phase at the end of the stroke up or down, to prevent slamming at the end of the stroke. Also, using the cheapest parts available is preferred. The stroke is about 8 inches at the connection point shown in the video.
Some sort of cantilever arm link to create an over center mechanical lock to lock the top down is needed. Manufacturing these parts by hand is fine. Buying them is ok. But components bought off the shelf are very expensive for this system to make it fast. I am looking for an alternative cheaper way to make this happen more efficiently.
Im hoping you guys/gals would like a challenge and are willing to help.
If you need any more info I will get it to you as soon as I can.
Everytime I try to figure out how to make this system gain more mechanical advantage, and speed ends up equalizing each other out. I am not sure what I am missing. I even broke out my kids erector set to play with various mounting points to no avail.
Im looking at making the system internal below the body work (minus the bar hinge) so the actuator and all the links would be inside the body if possible.Thank you for your time.
ydeardorff
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