|Title of Invention||
AUTO PRESSURE CHANGER WITH PISTON DISPLACEMENT FOR SHOCK ABSORBERS
|Abstract||The present invention relates to a Auto pressure changer with piston displacement comprising two co-axial cylinder, one in internal (cylinder! a & 1b)and other in external connected firmly and hydraulic fluid seal in the cylinder -2 therein piston-10 divides the internal cylinder - 1(a) into two chamber, chamber -1 and chamber - II chamber -1 with the help of piston -10 pushes out the hydraulic fluid through orifices and the groves of the cylinder 1a and cylinder 1b. As and when chamber - I compress, the magnitude of the damping forces developed on the piston - 10 also increases, the hydraulic fluid flowing through chamber -1 and chamber - II, passes through the rservior, finally moves to cylinder 1 (a) The damping force on the base of the piston - 10 is uniform in nature, piston -10 is firmly connected to the piston rod - 3. In order to avoid retraction of the piston with a jerk, internal spring - 18 is provided, and to make the piston rod movement ieakproof. Due to external forces, the piston rod - 6 moves longitudinally in the internal cylinder. The spring stopper -19 for free movement are fitted out side the casing and at the outside end 22 of the piston rod - 3 is fitted on outer spring 30, which immediately brings piston - 10 in equilibrium position,|
|Full Text||The present invention relates to Auto pressure Changer with Piston displacement for shock absorber.
SCOPE OF THE INVENTION:
When a person travels on road he feels different types of shocks due to the varying quality of roads. Sometimes the magnitude of these shocks cross the boundary of the shock absorbing techniques due to which the person which is sitting on the vehicle feels high intensity shocks. These shocks disturb the persons physically as well as mentally and may even damage the parts of the vehicle. These shocks directly or indirectly affects the muscles, ligaments along with cartilage damages of a person over a period of time which may lead to slow unseen physical abnormality in the said person.
It is well known that when a vehicle's speed is changed or said vehicle is suddenly stopped, the vehicles moving energy is immediately converts to static energy due to which shocks or vibrations are developed in the vehicle. The magnitude of the shocks or the vibrations of said vehicles is different at different conditions. To reduce such shocks or vibrations in a vehicle different types of shock absorbers are invented from time to time but till date there is no invention in relation to shock absorbers or anything similar to this which may reduce or invalidate the shocks or vibrations of variable magnitudes (minimum to maximum magnitudes) while a vehicle is in motion which may inturn help in providing safety to the motorcycle rider's or vehicle driver's along with the pillion's or the passanger's while traveling.
This invention controls the variation of pressure during the motion of piston in the cylinder. The piston does not radially strike to the bottom of cylinder. This technique is used in those area in which we need to absorb the external varying forces.
From starting of Bikes and Car age, the springs is used to absorb the shocks. But the shock absorbing range of the spring is sometimes less than the range of produce varying forces. To increase the range of shock absorbing spring several technique are given below.
- To increase the thickness of the spring in the middle section (Mazda motors of America)
- By using Jounce Bumper (American Honda Motors Company)
- By using Electronic Automatic Level Control System (ECM) (Monroe Auto Equipment company)
But the above given Technique are very costly & the efficiency of varying force absorbed by these techniques is very low and are not durable.
In modern age there are several fields where we can feel different magnitude of shocks at uncertain time interval. When a person feel these types of shocks he feel physically as well as mentally tiredness. If we connect these shocks ( external varying forces) with the help of the Auto pressure Changer with Piston displacement of the present invention in place of conventional springs or any other such means then we can reduce the tiredness which may arise due to these shocks up to higher limit. This technique by which Auto pressure Changer with Piston displacement operates is not only cheap but also durable.
In conventional shock absorbers when a vehicle runs on the road the piston of the shock absorber strikes on the bottom of the cylinder. To avoid this, usually the speed of the vehicle is required to be slowed down; however, this leads to more consumption of the fuel as well as requires more time.
OBJECT OF THE INVENTION:
The present invention can be used in any of the pistons where the damping force range at any of the certain displacement is required to be improved. Due to this displacement the abrosbtion range of the external variable forces can be improved. The object of the invention is to develop a technique which should not only be cheap and simple but also provide a solution in absorbing a range of the external variable forces.
The surface area and the number of the grooves (passages) and orifices of the pressure changer of the present invention and the measurement of the energy developed by the hydraulic fluid inside the grooves, converts the forces to the desired level. The following are the ways in which the force may be controlled with the help of the instant invention:
1. The final damping force may be controlled by means of the changing forces which may depend on the initial damping force of the certain variable forces.
2. Controlling the compress distance as per the requirement to achieve the range of the
3. Achieving between the compress distance and the developed damping force a graph of the piston between the straight line to exponentially.
SUMMARY OF THE INVENTION:
The invention is based on the damping force developed due to hydraulic fluid passing through the orifices and grooves. Internal cylinder (la) wall has orifices (a) and adjacent to the outside circumference of these orifices are grooves of different width and depth. There is a second movable cylinder whcih is mounted on the internal cylinder (la) having orifices ( 1 b ) on it (Figure-lc). A movable Piston (10) divides the internal cylinder into two separate chambers, chamber I and chamber 11.
Chamber I: The Chamber I develop the damping force due to the fluid moving out of the cylinder due to the pressure of the said piston.
Chamber 11 : The fluid moving out of chamber I through the reservoir immediately enters in the internal cylinder.
The orifices on the wall of the cylinder 1(a) & 1(b) are placed circumferentially at the corners of the triangle, square; heptagonal, octagonal corners in all direction.
Equilibrium state/position -
To bring the piston from static position to moving position, minimum force is required. The distance of the normal position is the distance between the piston in static position and the first orifice.
As and when the piston moves away from its normal position, the total area of the orifices and/or grooves present on the internal cylinder decreases due to which the volume of the fluid in the chamber I decreases .this creates an increasing damping force spreading in equilibrium state at the base of the piston.
The piston is attached to an external medium so as to move the said piston from its normal position and develop variable forces. The damping force is developed by the fluid moving
through the grooves and orifices so as to control the said variable forces. The magnitude of the damping force may be controlled from minimum to maximum (approx. from zero to infinity) as per the requirement. The damping force developed on the piston depends on the hydraulic fluid moving out of the internal cylinder i.e. directly proportionate to the said hydraulic fluid moving out through orifices and grooves.
The minimum magnitude of damping force will be developed on the piston where as the maximum hydraulic fluid will come out of the grooves or orifices of the internal cylinder. In other words, the minimum the force by which the fluid will come out of the walls of the orifices the minimum the force required to push the piston forward.
Opposite to this, as the quantity of the fluid coming out decreases, the ratio of the magnitude of the damping force developed on the piston will also increase and when there are no orifices or grooves for the fluid to come out of the cylinders then maximum force will be required to push the piston forward. Outer spring (30) is connected to the spring stopper (19) and piston rod (3) on the other side due to which the spring moves the said piston immediately again in its equilibrium position or the normal position for continuing the next cycle.
Following are the factors which affect the range of the Damping force:
i. By pass of hydraulic fluid from chamber-1 to chamber-II by piston orifices may be
possible/ not possible.
ii. Moving out or not moving out of the Hydraulic fluid through bottom valve of chamber I
iii. Number of orifices or grooves and their area.
iv. Viscosity of the Hydraulic fluid.
.Followings are the optional parts of the instant invention:
a. When the oscillation rate of the piston is more then the hydraulic fluid will be hot due to the development of the damping force. Coolent may be required or used to cool down the said hydraulic fluid. Nevertheless, if the oscillation rate of the said piston is less
then there will be no need for such a Coolent. For example in cases of earthquake, vehicle accidents etc.
b. To expand the piston in a similar fashion ie. Equilibrium position, a shock absorber may
be used in parallel order. Condition for this is that the rate of the hydraulic fluid passing
through the orifices of the piston of this shock absorber should be kept less when
compared with the hydraulic fluid passing through the piston orifices of the chamber I
and chamber II of the instant invention. Due to this, the complete pressure changer will
work in a uniform motion with the help of the outer spring. The hydraulic fluid with the
help of a reservoir reaches to the internal cylinder and is ready for next motion cycle
without any jerk.
c. The valves are used on the orifices made on the wall of the cylinder which will help in
auto return of the uniform motion.
d. Pressure gas may be used in the upper part of the reservoir to make the hydraulic fluid
to enter into chamber 11 of the internal cylinder.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Figure-1: Tangential cross section of the Auto pressure Changer with Piston displacement
Figure 1(a): Transverse section of the internal cylinder showing flow of hydraulic fluid in the orifices (change of equilibrium position to moving position of the piston)
Figure 1(b): Position of the piston when going away from the equilibrium position and how the surface area of orifices and grooves decreases leading to increase in damping force.
Figure 1(c): Detailed view of Auto pressure Changer Fig (a) Figure 1(d): Radial cross section of the Auto pressure Changer showing fluid flow directions.
Figure 1(e): Longitudinal Section of the Auto pressure Changer showing external and internal cylinders along with chamber I and I I . Also shown the directional Flow of fluid in the cylinder.
Figure 2(a): Practical use of the invention in question as SHOCK ABSORBER
Figure 2(b): Cross Section of the claimed Auto pressure Changer showing its application i.e. Auto pressure Changer when applied to railway bogies or Heavy vehicles as coupler/cushion pillor.
Figure 3: Graphical representation of the damping force from first orifice to last orifice.
Figure 4: Flow chart of applied external forces and its effect on piston.
DETAILED DESCRIPTION :
There are two co-axial cylinder, one is internal (cylinder 1 a and 1 b) and second is external, which are connected to each other firmly. The external cylinder (2) is completely hydraulic fluid resistant.
According to Figure 1(c), on the upper side of the cylinder 1(a) another cylinder (lb) push fitted. Piston (10) divides the internal cylinder 1(a) into two chambers, chamber I and chamber 11.
Chamber I with the help of piston 10 pushes out the hydraulic fluid through the orifices and the grooves of the cylinder 1(a) and cylinder 1(b). As and when chamber I compresses, the magnitude of the damping force developed on the piston (10) also increases. The hydraulic fluid flowing through Chamber 11 and chamber I, passes through the reservoir, finally moves to cylinder 1(a). The orifices (4.1.a, 4.2.a, 4.3.a....) are made on the external circumference of the grooves (4.1.b, 4.2.b, 4.3.b....) of the cylinder 1(a) in such a manner that the damping force on the base of the piston 10 is uniform in nature.
The orifices (4.1.c, 4.2.c, 4.3.C..) of cylinder 1(b) are placed in the grooves (4.1 .b, 4.2.b, 4.3.b....) in such a way so that fluid with the help of piston moves through orifices (4.1.a, 4.2.a, 4.3.a....) leading towards cylinder 1 b via grooves (4.1.b, 4.2.b, 4.3.b....). From their the said fluid after developing a damping force goes out through orifices (4.1.c, 4.2.c, 4.3.C..) of cylinder 1 b . The order of 4.1, 4.2, 4.3 ...increases in number whereas the surface area of the grooves/orifices decreases due to which the magnitude of the damping force on the bottom of the piston also increases with increase in equilibrium to distance of the said piston. The static position and the distance uptil 4.1 is considered as the
equilibrium position of the said piston.
The piston rod 3 with the help of external force is used to moves the piston 10 in the internal cylinder. The "O" ring (11) on the piston helps to avoid any leakage of the fluid through the cylinder inner wall and said piston.
Sim valve (14) controls the flow of the fluid, coming out of Piston orifice (12, into chamber I and chamber I I . Similarly, Sim valve 13 helps in controlling the fluid bypassing through piston orifice 12 of chamber I and chamber 11 when piston 10 moves to its normal position.
Piston is firmly connected to the piston rod (3) with the help of a nut/ any such thing 15. In order to avoid retraction of the piston with a jerk, internal spring (18) is provided and to make the piston rod movement leak-proof " 0 " ring 16 is provided in the said chuk nut (17). The hydraulic fluid is filled in all these parts as per the depiction given in the accompanying figures and closed with chuk nut 17. The complete unit in question is leak-proof. Due to external forces, the piston rod 6 moves longitudinally in the internal cylinder. The spring stopper - 19 for free movement are fitted outside the casing and at the outer side (22) of the piston rod-3 is fitted an outer spring 30 which immediately brings piston 10 in normal position. In this way, at every oscillation, the claimed Auto pressure Changer absorbs the external variable forces at every compression cycles.
Figure 1(d) is showing radial cross section where a groove is depicted which joins both the cylinders with the help of a technique wherein the circular grooves 'b' are connected with the orifices 'a' of the internal cylinder 1 a and orifices 'c' of the cylinder 1 b . The orifices of the internal and external cylinders are placed at equal arm triangle corner arrangement position in such a way that the width and breadth of each grooves is equal because of which the movement of the fluid is equally through all the orifices.
The movement of fluid is depicted with the help of sign.
Figure-le- Depicting the Transverse cross section of the auto pressure changer wherein the orifice 'a' and orifice 'c' of cylinder 1 a and cylinder 1 b respectively are connected via Groove 'b'. The orifices within the orifices 'a' and 'c' are depicted with dotted lines (....). Groove 'b' is present in all directions of the cylinders.
Figure 2(b) is showing the application of the instant invention in the couplings and cushion pillor of the bogies of the railway and heavy vehicles. In this, at the outer side 22 of the piston rod 3 there is a plate 23 fitted which is elevated towards central point so that force should develop on this plat only which in turn develops a uniform force at the internal and external surfaces of the grind cylinder 24. The bushes 24 are fitted on the outside of cylinder 31 which helps in movement of piston 10 and spring 30 bring the said spring in normal position.
To keep the bush smooth, oil keeps on coming via orifice 26. End 24 is connected with wall / chassis of the bogies and another end -31 is free to strike with second cushion pillor. Bottom valve- 23 works for sending hydraulic fluid from reservoir to internal cylinder. When the speed of the bogies changed or stops then the variable force act between the bogies. This variable force absorbed by the cushion pillor due to which jerks are not generated and the piston- 7 reaches in equilibrium state with the help of external spring -22 by cylinder 20 and this is again ready for absorb next speed change.
Figure 3- graphs depicting hydraulic fluid movement indicating that said fluid moves through the walls of the cylinders.
Graph 1 showing piston movement from normal position where damping force starts developing.
Graph II - When piston moves away form the first orifices and damping force developed at that stage.
Graph III - Damping forces F developing when piston as it moves away from the orifices.
Graph IV - Shows the motion of a piston- 10 by external variable force in one oscillation.
The pressure changer can be used in couplings in cusion pillor of boggies of the railways and heavy vehicles, building, earthquake resistant buildings, making vehicle accidental proof, to nullify the vibration developed due to static machine making aeroplane shock absorbers and the bottom stand of helicopter.
1. Auto pressure changer with piston displacement comprising two co-axial cylinder, one
in internal (cylinder la & lb) and other in external connected firmly and hydraulic fluid
seal in the cylinder - 2 therein piston - 10 divides the internal cylinder - 1(a) into two
chamber, chamber - 1 and chamber - II, the chamber - 1 with the help of piston - 1 0
pushes out the hydraulic fluid through orifices and the groves of the cylinder la and
cylinder lb, when chamber - 1 compress the magnitude of the damping forces developed
on the piston - 10 increases, the hydraulic fluid flowing through chamber -1 and chamber
- II passes through the reservior and finally moves to cylinder 1 (a), wherein the damping
force on the base of the piston - 10 is uniform in nature, piston -10 is firmly connected to
the piston rod - 3, internal spring - 18 is provided in order to avoid retraction of the
piston with a jerk and to make the piston rod movement leak-proof, wherein due to
external forces the piston rod - 6 moves longitudinally in the internal cylinder, the spring
stopper -19 for free movement fitted out side the casing at the outside end 22 of the
piston rod - 3, the piston-3 is fitted is fitted on outer spring 30, which immediately brings
piston - 10 in equilibrium position,
2. Auto pressure changer with piston displacement as claimed in claim - 1 wherein piston
- 10 pushes out of the hydraulic fluid through the orifices and the grooves of the cylinder
- 1 (a) and cylinder - 1 (b) in chamber -1 of internal cylinder.
3. Auto pressure changer with piston displacement as claimed in claim -1 wherein the magnitude of damping force depends on the fluid moving out of chamber - 1 whether the said fluid by pass the grooves / orifices and orifices along- side piston orifices on chamber - II by chamber - 1 or through bottom valve of the internal cylinder or both or none of these.
4. Auto Pressure changer with piston displacement as claimed in claim-1 wherein the piston in the chamber -1 of internal cylinder -1 (a) stops at a point called the null point at which the said piston starts moving to the equilibrium state due to external forces,
5. Auto Pressure changer with piston displacement as claimed in claim- 1 wherein the
orifices (4.1 c, 4.2.C, 4.3.C..) of cylinder 1(b) are placed in the grooves (4.1.b, 4.2.b, 4.3.b....) in such a way so that fluid with help of piston - 10 moves through orifices (4. 1.a, 4.2.a, 4.3.a...) leading towards cylinder 1(b) via grooves (4.Lb, 4.2.b, 4.3.b...), the
orifices 4.1, 4.2, 4.3 increases in number where as the surface area of the grooves /
orifices due to which the magnitude of damping force on the bottom of the piston also decreases with increases in the distance from equilibrium state of the said piston,
6. Auto Pressure changer with piston displacement as claimed in claim-1 wherein said comer of the grooves in radial shapes due to which less viscous force is developed on the wall of the said grooves.
7. Auto Pressure changer with piston displacement as claimed in claim- 1 wherein the number of grooves / orifices may vary depending on external variable forces range.
8. Auto Pressure changer with piston displacement as claimed in claim- 1 wherein the said pressure changer reduce the intensity of the impacts of collision of the two bodies / vehicles during the situation of head on collision.
9. Auto Pressure changer with piston displacement as claimed in claim-1 wherein the ends of the cylinder 1 (a) and 1 (b) are changes in case of the damping forces increases in case system extended and when the piston at equilibrium state is maximum compress.
10. Auto Pressure changer with piston displacement as claimed in any of the claim 1 to 9
where in the said pressure changer may be used in couplings and cushion pillor of
boggies of the railways and heavy vehicles, building earth quick resistant buildings,
making vehicle accidental proof, to nullify the vibration developed due to static machine,
making helipads and Aeroplane shock absorbers.
|Indian Patent Application Number||868/DEL/2007|
|PG Journal Number||36/2010|
|Date of Filing||19-Apr-2007|
|Name of Patentee||MADAN MOHAN SHARMA|
|Applicant Address||V+P.O. KARANWAS DISTT-BULANDSHAHAR (U.P.)INDIA PIN-202393|
|PCT International Classification Number||B22D|
|PCT International Application Number||N/A|
|PCT International Filing date|