info idroguida

[pika]

hello to all boys, I ask you a huge help if you can and want.
I am writing a graduate thesis in mechanical engineering, on the functioning of the distribution drawer and the general efforts of a hydroguide, unfortunately I have few data.
I would be extremely grateful if anyone knew any data (strength on the braces, flying couple, materials etc.) was so kind to send it to me.
Thank you very much for your help!

I think that to begin with this document might come in handy.

I have some data in particular on the steering box that mounts the daily echo 4x4. I can't publish them, but if you need anything in particular, maybe I can tell you.

 

[penna84]

I think that to begin with this document might come in handy.

I have some data in particular on the steering box that mounts the daily echo 4x4. I can't publish them, but if you need anything in particular, maybe I can tell you.

Thank you very much for the surgery. .
I would have any question to ask you that with my thesis it is relatively centered but that cmq would take away some doubts.
the pump of a hydro we suppose has a pressure of 100bar, this pressure you have both with the motor to the minimum and with the motor to the max number of turns right?! there is x which a valve that regulates the pressure always at 100.
It seems to me, that since the low speeds having short tubes there will be no great pressure losses between the use of the pump and the pressure inside the hydroguide. Do you confirm? !
As last I ask you if you can and you want, you can tell me + or not the force on the throttle (or the pressure of use) in case the vehicle is still and is turning the wheel?
Thank you.

 

[penna84]

the speech in my opinion is quite simple: In any case you must consider the most dangerous situation, so, as already written by someone previously, you can put yourself in favor of safety by blocking the wheels and measuring the efforts on the steering arms. I don't know if your faculty makes you available multibody software, if it were to build a simplified vehicle model wouldn't be a big problem. I could recommend you, for example, lotus suspension analysis (here you find info: www.lesoft.co.uk); it has already inside many models of suspension "preset" and is a play by boys to see the forces that develop on the various members. I use it at university and it is quite valid, especially for a preliminary analysis in the sizing phase. I think you might be useful (if you didn't have it, it's not even very expensive)

I will try to inform myself in one if they have, I gave a modeling exam but it was used as abaqus program, I found it quite complex and studied the maximum efforts of auditions with different geometries.
if you tell me that the program is intuitive and with a quick read to education you can find a reliable +o- data I try immediately

 

[guidolin.m]

I will try to inform myself in one if they have, I gave a modeling exam but it was used as abaqus program, I found it quite complex and studied the maximum efforts of auditions with different geometries.
if you tell me that the program is intuitive and with a quick read to education you can find a reliable +o- data I try immediately

I have learned to use it in a couple of hours, in case you need info contact me in private, just not to obberate this discussion

 

[Er Presidente]

Thank you very much for the surgery. .
I would have any question to ask you that with my thesis it is relatively centered but that cmq would take away some doubts.
the pump of a hydro we suppose has a pressure of 100bar, this pressure you have both with the motor to the minimum and with the motor to the max number of turns right?! there is x which a valve that regulates the pressure always at 100.
It seems to me, that since the low speeds having short tubes there will be no great pressure losses between the use of the pump and the pressure inside the hydroguide. Do you confirm? !
As last I ask you if you can and you want, you can tell me + or not the force on the throttle (or the pressure of use) in case the vehicle is still and is turning the wheel?
Thank you.

Are you just asking pika?

 

[penna84]

Are you just asking pika?

No no excuse. .I am doubtful that they came to me this week I have always forgotten to ask you. .any opinion on the steering system and well accepts from anyone!

 

[penna84]

I have learned to use it in a couple of hours, in case you need info contact me in private, just not to obberate this discussion

thank you very much for the availability!:finger:

 

[Er Presidente]

Thank you very much for the surgery. .
the pump of a hydro we suppose has a pressure of 100bar, this pressure you have both with the motor to the minimum and with the motor to the max number of turns right?! there is x which a valve that regulates the pressure always at 100.
It seems to me, that since the low speeds having short tubes there will be no great pressure losses between the use of the pump and the pressure inside the hydroguide. Do you confirm? !
As last I ask you if you can and you want, you can tell me + or not the force on the throttle (or the pressure of use) in case the vehicle is still and is turning the wheel?
Thank you.

the pump varies the flow according to the turns.
The pressure is practically constant starting from a number of laps that coincides with the minimum of the engine.
the box leaves the "open center" so if the steering wheel is at the center the pump is practically short circuited to the discharge and the pressure at the minimum (2 or 3 bars that concise with the losses of the circuit).
when dirts "close" progressively discharge the pump and pressure rises until the discharge is closed (maximum pressure), the hundred bars are limited by a bypass valve calibrated so that it only open to that pressure (minimum door, maximum pressure).

on "modern" cars you do not want to struggle in the parking lot and diesel engines have a minimum low, keep the pump at the minimum of the turns to ensure the flow in the parking steering forces the pump to unnecessary high regimes when the motor reaches the maximum regime.
that's why they introduced the hydraulic pumps controlled by an electric motor that maintains the constant regime to any engine regime, decreasing the wear of the pumps (and increasing that of alternators and batteries :smile: ).

Hi.

 

[penna84]

the hundred bars are limited by a bypass valve calibrated so that it only open to that pressure (minimum door, maximum pressure).

This is not very clear to me. .the pump has a valve that does not allow to exceed 100bars but do not understand what you mean by minimum flow and maximum pressure, if the pump turns quickly not from 100 bar the same if it is required? !
cmq thanks for the info you know everything!:finger:

 

[pika]

the pump varies the flow according to the turns.
The pressure is practically constant starting from a number of laps that coincides with the minimum of the engine.
the box leaves the "open center" so if the steering wheel is at the center the pump is practically short circuited to the discharge and the pressure at the minimum (2 or 3 bars that concise with the losses of the circuit).
when dirts "close" progressively discharge the pump and pressure rises until the discharge is closed (maximum pressure), the hundred bars are limited by a bypass valve calibrated so that it only open to that pressure (minimum door, maximum pressure).

nothing to laugh, everything ok

on "modern" cars you do not want to struggle in the parking lot and diesel engines have a minimum low, keep the pump at the minimum of the turns to ensure the flow in the parking steering forces the pump to unnecessary high regimes when the motor reaches the maximum regime.
that's why they introduced the hydraulic pumps controlled by an electric motor that maintains the constant regime to any engine regime, decreasing the wear of the pumps (and increasing that of alternators and batteries :smile: ).

However, this solution is used only for the cars of the belt and the compact because the power provided by the electric system of the vehicle is contained. for high-end cars use a hydraulic servo-assisted steering wheel.

This is not very clear to me. .the pump has a valve that does not allow to exceed 100bars but do not understand what you mean by minimum flow and maximum pressure, if the pump turns quickly not from 100 bar the same if it is required? !
cmq thanks for the info you know everything!

the valve is mounted directly on the hydroguide. is the schema on page 6 of the pdf I published yesterday. the hydroguida to which the pdf refers is hydraulic recirculation of spheres, is mainly used on commercial vehicles.
on the cars find those pinion-cremagliera but the hydraulic control in practice is the same.


on page 8 find the curves characteristics for a servoassist steering

the European Directive 70/311/eec lays down the maximum values which must be at the wheel depending on the type of vehicle (maximum operating force) and depending on whether the servosterzo functions or not:

category_______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ [N]____m1_________150 (300) in parentheses the value with the out-of-use system
_____________150 (300)
_____________200 (450)
____________200 (300)
_____________250 (400)
_____________200 (450)