Claims:We claim:
1. A mechanical governor (100) for a pump (200), comprising a control rack (106) movable to control engine speed, a strap (104) connected to one end of said control rack (106) to transmit motion, and a stop lever (202) adapted to move said control rack (106) to an engine stop position, characterized in that:
a sleeve (302) mounted on said strap (104), said sleeve (302) comprising an arm (304) which extends towards said control rack (106) and ends with a bent portion (306), and
a dampener (308) located on said strap (104), in a manner that said sleeve (302) rests on said dampener (308), and said stop lever (202) when actuated, hits said bent portion (306) of said sleeve (302), and dampens an impact.

2. The mechanical governor (100) as claimed in claim 1, wherein said strap (104) connects a fulcrum lever (402) to said control rack (106).

3. The mechanical governor (100) as claimed in claim 1, wherein said dampener (308) is a spring.

4. The mechanical governor (100) as claimed in claim 1, wherein said stop lever (202) is actuated manually.

5. The mechanical governor (100) as claimed in claim 1, wherein said stop lever (202) is actuated through a solenoid.

6. The mechanical governor (100) as claimed in claim 1, wherein said strap (104) comprises step profile forming a shoulder (502).

7. The mechanical governor (100) as claimed in claim 6, wherein said dampener (308) rests on said shoulder (502).

8. The mechanical governor (100) as claimed in claim 1, wherein said sleeve (302) is fixable between at least two positions on said strap (104).
, Description:Complete Specification:
The following specification describes and ascertains the nature of this invention and the manner in which it is to be performed:

Field of the invention:
[0001] The present invention relates to a mechanical governor for an engine.

Background of the invention:
[0002] According to a prior art US4922873, an electromechanical run/stop actuator for diesel engine is disclosed. A solenoid is affixed to a bracket having a base complementary in configuration to a portion of the housing of a diesel engine fuel pump governor that is spaced from the governor's run/stop member; the bracket is mounted on the governor housing by two bolts that also serve to join two halves of the governor housing. A lever mounted on the run/stop member of the governor is connected, by a connecting rod and swivel connection, to the solenoid plunger, so that plunger movement responsive to energization of the solenoid rotates the run/stop member to a RUN position; on de-energization of the solenoid its spring drives the run/stop member to a STOP position. A support rod affixed to the center of the bracket and mounted to the governor housing by a cover mounting bolt braces the bracket against engine vibration.

Brief description of the accompanying drawings:
[0003] An embodiment of the disclosure is described with reference to the following accompanying drawing,
[0004] Fig. 1 illustrates a conventional mechanical governor;
[0005] Fig. 2 illustrates a side cross-section view of a pump fit with the conventional mechanical governor;
[0006] Fig. 3 illustrates a first view of a mechanical governor, according to an embodiment of the present invention;
[0007] Fig. 4 illustrates a second view of the mechanical governor, according to an embodiment of the present invention, and
[0008] Fig. 5 illustrates a third view of the mechanical governor, according to an embodiment of the present invention.

Detailed description of the embodiments:
[0009] Fig. 1 illustrates a conventional mechanical governor. In the mechanical governor 100, a locking pin 102 locks the control rack 106 to a strap 104. The strap 104 is moved by the linkage mechanism of the mechanical governor 100 as known in the art. The problem arises when an engine needs to be stopped. A driver pulls a knob in a mechanical system or presses a button in electronic system, to activate a stop lever 202 (shown in Fig. 2). The stop lever 202 pivots within the housing of the mechanical governor 100 and hits the extended locking pin 102, thereby pulling the control rack 106 (also shown in Fig. 2) to engine stop position or zero delivery position and shuts down the engine. However, due to continuous usage, the extended locking pin 102 bends or the stop lever 202 bends, leading to engine stop failure. The mechanical governor 100 is a centrifugal governor and for a pump 200 (shown in Fig. 2) such as inline fuel injection pump.

[0010] Fig. 2 illustrates a side cross-section view of a pump fit with the conventional mechanical governor. The pump 200 injects fuel based on plunger/piston action as known in the art, and hence the respective description is avoided. A side cross section view of the pump 200 is shown. Further, a first detailed view 210 illustrates a start position of the control rack 106, where the fuel delivery to the engine is present. The stop lever 202 rests on the locking pin 102 in inactive state or is away from the locking pin 102. A second detailed view 220 illustrates a stop position of the control rack 106 or the zero delivery position of the engine. Here, the stop lever 202 is energized either manually or electrically. The stop lever 202 moves the control rack 106 away by means of the locking pin 102. In the position shown in the second detailed view 220, the locking pin 102 or the stop lever 202 experiences a force which in the continuous usage causes deformation of the either of the locking pin 102 or the stop lever 202 or both.

[0011] Fig. 3 illustrates a first view of the mechanical governor, according to an embodiment of the present invention. The mechanical governor 100 comprises a control rack 106 (not shown in Fig. 3) movable to control engine speed, a strap 104 connected to one end of the control rack 106 to transmit motion, and a stop lever 202 adapted to move the control rack 106 to an engine stop position. The mechanical governor 100 is characterized by, a sleeve 302 mounted on the strap 104. The sleeve 302 comprises an arm 304 which extends towards the control rack 106 and ends with a bent portion 306. A dampener 308 located on the strap 104, in a manner that the sleeve 302 rests on the dampener 308. The stop lever 202 when actuated, hits the bent portion 306 of the sleeve 302. The sleeve 302 is pushed against the dampener 308 which dampens the impact.

[0012] Fig. 4 illustrates a second view of the mechanical governor, according to the embodiment of a present invention. The strap 104 connects a fulcrum lever 402 to the control rack 106, as known in the art. The dampener 308 is a spring. The stop lever 202 is actuated manually. Alternatively, the stop lever 202 is actuated through a solenoid.

[0013] Fig. 5 illustrates a third view of the mechanical governor, according to an embodiment of the present invention. The strap 104 comprises step profile forming a shoulder 502. The dampener 308 rests on the shoulder 502. Further, the sleeve 302 is fixable between at least two positions on the strap 104.

[0014] According to an embodiment of the present invention, an impact absorbing strap 104 for mechanical governor 100 is provided. The present invention improves robustness of existing setup by absorbing excess actuation force. In the present invention, upon actuation, the stop lever 202 moves and hits the bent portion 306 on the spring loaded control strap 104. In the process, the spring gets compressed and absorbs the energy from impact without bending the stop lever 202 or the locking pin 102.

[0015] It should be understood that embodiments explained in the description above are only illustrative and do not limit the scope of this invention. Many such embodiments and other modifications and changes in the embodiment explained in the description are envisaged. The scope of the invention is only limited by the scope of the claims.