Claims:1. A shock absorber for a two wheeler having passive electronic control comprising:
an outer tube (201) configured to contain a piston rod (303);
a spool arrangement provided integrally with the piston rod (201) comprising, an inner spool (303 A) and an outer spool (303 B);
wherein the inner spool (303 A) is adapted to contain within the outer spool (303 B), wherein the spool arrangement provided to rest over a spool seat;
a motor (100) connected with an ECU (20);
wherein a motor shaft (101) is coupled with a wedge (107) ;
wherein, said wedge maintains a pre-determined inclination across its length and is adapted to move in a liner direction on motor actuation;
2. The shock absorber for a two wheeler having passive electronic control as claimed in claim 1, wherein a posterior portion of a wedge (107 b) is in continuous contact with a upper section of the inner spool; and as the wedge (107) moves in linear direction the total length of spool arrangement within the piston rod is varied which provides variable damping.

3. An electronic passive shock absorber for a two wheeler as claimed in claim 1, wherein the wedge coupled with said motor shaft has an anterior portion (107 a) and a posterior portion (107 b) and said anterior portion (107 a) and the posterior portion (107 b) are present at different pre-determined inclinations.

4. An electronic passive shock absorber for a two wheeler as claimed in claim 1, wherein when the upper section of the inner spool is in contact with the anterior portion of the wedge total length of spool arrangement inside the piston rod is increased.

5. An electronic passive shock absorber for a two wheeler as claimed in claim 1, wherein when the upper section of the inner spool is in contact with the posterior portion of the wedge total length of spool arrangement inside the piston rod is reduced.

6. An electronic passive shock absorber for a two wheeler as claimed in claim 1, wherein a position sensor is provided which determines the position of the wedge.
, Description:An embodiment of the present invention will be described with reference to the accompanying figs 1 to 6
First, referring to Fig. 1, which is the front view of the conventional shock absorber as according to the prior art. A shock absorber is generally mounted over the rear wheels of the two-wheeler. A conventional shock absorber (200) comprising, an outer tube (201), a piston rod (203), a pre-load adjuster (205), an extension (207) and an outer spring (211). Herein, the piston rod (203) is adapted to contain within the outer tube (201). The piston rod (203) functions to provide an effective damping mechanism by the flow of a hydraulic fluid. The piston (203) contained within said outer tube (201) moves within the outer tube (201). The outer tube (201) filled with a damping oil along with perforated valves. The oil is then dissipated from the holes of the valve and hence allowed limited resistance to the movement of piston thereby performing efficient damping. Toward the outer surface of said outer tube (201) is present outer spring (211). The preload adjuster (205) present at the bottom of the outer tube (201) helps to adjust the pre-compression of outer spring. At the head of the outer tube (201) is present an extension (207) which helps in mounting said shock absorber over the rear wheels. A canister assembly (215) may be further adapted to contain at the base of the outer tube (201) below the preload adjuster (205). The canister is filled with pressurized nitrogen gas, which further act as reservoir for both oil and nitrogen gas. The role of the nitrogen gas is to keep the damping oil pressurized and hence prevent the cavitation.
Referring to Fig 2, which front view of an electronic passive shock absorber according to the present invention. The electronic passive shock absorber comprising, a shock absorber (300), a motor (100), an E.C.U (10), a position sensor (50). The conventional shock absorber (200) is fitted with a mounting bracket (217) at the head of said shock absorber. To the right side of the mounting bracket (217), generally a motor (100) is fitted while, on the left side of the mounting bracket (217) generally, a position sensor (50) is fitted. An E.C.U (electronic control unit) (10) is connected with a battery (20), a switch (30), an ignition key (40) through wires (11, 13, 15). Also, said E.C.U is connected with the motor (100) and said position sensor (50) through wires (17, 19). When the ignition key (40) is turned on the E.C.U (10) enters into an active state, E.C.U then checks the user input by switch (30). In case where the switch (30) is pressed the motor (100) begins to move which in turn alters the length of the piston (303).
Referring to Fig 3, front exploded view of an electronic passive shock absorber according to the present invention. The motor (100) has a shaft (101) which is adapted to establish connection with a wedge connecter (105). A cover (103) is adapted to be present over the connection of the shaft (101) and the wedge connecter (105). The wedge connecter is thereafter is connected with a wedge (107). The lower section of the wedge (107) has an inclination at a specified angle. The wedge has an anterior portion (107a) and a posterior portion (107b). In the default condition the switch (50) would be open the wedge (107) On actuation of the switch (30) the motor moves in a anticlockwise direction which in sequence would move the motor shaft (101), the wedge connecter (105) resulting into motion of the wedge (107). Also, when the piston rod (303) is adapted to contain within the outer tube (201). The piston rod (303) has an inner spool (303A) and an outer spool (303B). The inner spool (303A) has an upper section (303Aa) and a lower section (303Ab). Furthermore, outer spool (303B) has an upper section (303Ba) and a lower section 303Bb). The inner spool (303A) and the outer spool (303B) also establishes contact with the O-ring (303Ao, 303Bo). The function of an O-ring is to prevent loss of any hydraulic fluid. The position sensor (50) is so arranged that when the wedge (107) moves from the posterior portion (107b) to the anterior portion (107a) the position sensor (50) gets pressed automatically.
Referring to Fig 4, is front cross-sectional view of an electronic passive shock absorber at position 1 according to the present invention. At position 1, wherein the inner spool (303A) upper section (303Aa) is in contact with the posterior portion of the wedge (107b). Herein, the lower section of the outer spool (303Bb) is not in contact with the spool seat (303C). As a result there would be an available space through the sides of the lower section of the outer spool (303Bb). The damping oil while flowing from a tension chamber to a compression chamber in addition to the conventional path would also have this alternative path available. Therefore, the damping oil would be permitted to flow, along the conventional path as well through the sides adjacent to the lower section of the outer spool (303Bb).
Referring to Fig 5, is front cross-sectional view of an electronic passive shock absorber at position 2 according to the present invention. The position 2 reflects a condition wherein the inner spool (303A) upper section (303Aa) is in contact with the anterior portion of the wedge (107a). Herein, the lower section of the outer spool (303Bb) is in contact with the spool seat (303C). Due to the contact which is established between the spool seat (303C) and lower section of the outer spool (303Bb) there would be no alternative path available. The space present adjacent to the lower section of the spool (303Bb) would now be closed. Therefore, the damping oil would be required to flow only through the conventional path thereby, increasing the damping force. Now, once the ignition key (40) is started the user input given at the switch (30) taken by the E.C.U (10). In case where the user has manually pressed the switch (30) the motor is made to rotate which in turn moves the wedge (107). Due to this movement of the wedge towards the position sensor (50) the position sensor gets triggered. The indicator would therein would reflect that the spool is in closed condition.
Referring to Fig 6, which is the flowchart. Once the ignition key (40) is turned on it would determine the user input. In case the user input is found to be true it would trigger the motor (100). On activation of the motor (100) the wedge (107) would move at the desired position. Thereby, providing the required damping. Once ignition key (40) is again turned off the wedge (107) would again move to its default position.
Although the embodiments of the present invention is described above, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the scope of claims.