GB2112902A - A stabilizer utilising hydraulic damping - Google Patents

Abstract

The stabilizer has a piston 13 slidingly guided in a housing bore 11 and which bounds at its ends pressure chambers 20, 21 which are connected to one another by a duct 22 including a throttle 23. The piston is resiliently connected to a linkage 15, 17 of the regulator, for example an injection pump. In the piston, two parallel extending bores (26, 27) are formed passing through the piston and in which are arranged pressure limiting valves (33, 42) opening and closing in opposite directions. In this way, a stabilizer is provided which has a short regulating time on the occurrence of large sudden changes in load. <IMAGE>

Description

SPECIFICATION A stabilizer State of the art The invention originates from a stabilizer according to the preamble to the main claim. One known stabilizer of that kind has a piston slidingly arranged in a housing and which is loaded on both ends by compression springs and the control rod is connected at one end and the linkage for the regulator is connected at the other end.

However, a stabilizer of that kind has the disadvantage that the regulation times are too long during sudden load changes.

Advantages of the invention As opposed to this, the stabilizer in accordance with the invention comprising the characterising feature of the main claim has the advantage that the response sensitivity is high, on the other hand the regulation time is short.

Drawing An embodiment of the invention is illustrated in the drawing by way of example and is explained in detail in the following description. Ths shows in Figure 1 a longitudinal section through a stabilizer, in Figure 2 a longitudinal section through the piston of the stabilizer.

Description of the embodiment The stabilizer has a housing in which is formed a bore 11 closed buy a cover 12. A piston 13 is sealingly slidingly arranged in the bore 11 and a compression/tension spring 14 which is supported by a lever 1 5 acts on one end of the piston. The lever 1 5 is rotatably mounted on a shaft 1 6 and is actuated by a control lever 1 7 of the injection pump.

The bore 11 accommodating the piston 13 issues into a recess 1 8 in the housing in which is arranged the lever 1 5. Both the housing recess 18 and the bore 11 are filled with oil. The two pressure chambers in the bore 11 separated by the piston 13 and referenced 20,21 are connected together by a diagrammatically illustrated duct 22 in which is arranged a throttle 23.

The piston 1 3 illustrated in longitudinal section in Figure 2 has two parallel extending bores 26, 27 which are partially closed by a cover 28. Two bores 29, 30 in alignment with the bores 26, 27 are formed in the cover. An annular groove 31 is formed at the bore 30 and surrounding the latter whereby an annular valve seat 32 for a plate-like closure member 33 is provided which is loaded by a compression spring 34. A cylindrical extension 35 which has an helical groove 36 at its end is formed at the end of the piston opposite to the cover 28. A duct 38 proceeds from that end and issues into the bore 27. A similar duct likewise proceeding from the end of the extensionissues into the bore 26.An annular groove 40 is formed at its end facing the extension whereby a valve seat 41 for a plate-like closure member 42 is provided which is urged against the valve seat by a compression spring 43. From that it can be appreciated that the closure members 33, 41 acting as pressure limiting valves open and close in opposite directions. The spring 14 is screwed onto the groove 36 in the extension. Its other end is connected to the lever 15 in a similar manner.

If sudden changes in load occur during a control operation, for example in the direction of the arrow P, then the closure member 33 is raised from the valve seat 32 so that a practically delayfree consequential movement of the piston 13 takes place. As a result of a pressure shock, the closure member 42 is opened in the reverse direction. If the sudden load changes are slight then volume compensation takes place through the duct 22 and indeed damped by the throttle 23. In that way, a good stable behaviour of the control device is guaranteed.

Claims

1. A stabilizer for mechanical regulators, especially injection pump regulators, consisting of a piston guided in a housing and which is in operative association with the control linkage of the regulator, characterised in that, the housing bore (11) accommodating the piston (13) is filled with liquid, that the piston is resiliently connected to the linkage (1 5, 1 7), that the pressure chambers (20, 21) arranged at the ends of the piston are connected to one another by a duct (22) extending parallel to the housing bore and including a throttle (23) and that two pressure limiting valves (33, 42) located in separate passages (26, 29, 39; 27, 30, 38) and in opposed directions are arranged in the piston.

2. A stabilizer according to claim 1, characterised in that, the pressure limiting valves are formed as spring-loaded plate valves.

3. A stabilizer for mechanical regulators substantially as herein described with reference to the accompanying drawings.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims (3)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION A stabilizer State of the art The invention originates from a stabilizer according to the preamble to the main claim. One known stabilizer of that kind has a piston slidingly arranged in a housing and which is loaded on both ends by compression springs and the control rod is connected at one end and the linkage for the regulator is connected at the other end. However, a stabilizer of that kind has the disadvantage that the regulation times are too long during sudden load changes. Advantages of the invention As opposed to this, the stabilizer in accordance with the invention comprising the characterising feature of the main claim has the advantage that the response sensitivity is high, on the other hand the regulation time is short. Drawing An embodiment of the invention is illustrated in the drawing by way of example and is explained in detail in the following description. Ths shows in Figure 1 a longitudinal section through a stabilizer, in Figure 2 a longitudinal section through the piston of the stabilizer. Description of the embodiment The stabilizer has a housing in which is formed a bore 11 closed buy a cover 12. A piston 13 is sealingly slidingly arranged in the bore 11 and a compression/tension spring 14 which is supported by a lever 1 5 acts on one end of the piston. The lever 1 5 is rotatably mounted on a shaft 1 6 and is actuated by a control lever 1 7 of the injection pump. The bore 11 accommodating the piston 13 issues into a recess 1 8 in the housing in which is arranged the lever 1 5. Both the housing recess 18 and the bore 11 are filled with oil. The two pressure chambers in the bore 11 separated by the piston 13 and referenced 20,21 are connected together by a diagrammatically illustrated duct 22 in which is arranged a throttle 23. The piston 1 3 illustrated in longitudinal section in Figure 2 has two parallel extending bores 26, 27 which are partially closed by a cover 28. Two bores 29, 30 in alignment with the bores 26, 27 are formed in the cover. An annular groove 31 is formed at the bore 30 and surrounding the latter whereby an annular valve seat 32 for a plate-like closure member 33 is provided which is loaded by a compression spring 34. A cylindrical extension 35 which has an helical groove 36 at its end is formed at the end of the piston opposite to the cover 28. A duct 38 proceeds from that end and issues into the bore 27. A similar duct likewise proceeding from the end of the extensionissues into the bore 26.An annular groove 40 is formed at its end facing the extension whereby a valve seat 41 for a plate-like closure member 42 is provided which is urged against the valve seat by a compression spring 43. From that it can be appreciated that the closure members 33, 41 acting as pressure limiting valves open and close in opposite directions. The spring 14 is screwed onto the groove 36 in the extension. Its other end is connected to the lever 15 in a similar manner. If sudden changes in load occur during a control operation, for example in the direction of the arrow P, then the closure member 33 is raised from the valve seat 32 so that a practically delayfree consequential movement of the piston 13 takes place. As a result of a pressure shock, the closure member 42 is opened in the reverse direction. If the sudden load changes are slight then volume compensation takes place through the duct 22 and indeed damped by the throttle 23. In that way, a good stable behaviour of the control device is guaranteed. Claims

1. A stabilizer for mechanical regulators, especially injection pump regulators, consisting of a piston guided in a housing and which is in operative association with the control linkage of the regulator, characterised in that, the housing bore (11) accommodating the piston (13) is filled with liquid, that the piston is resiliently connected to the linkage (1 5, 1 7), that the pressure chambers (20, 21) arranged at the ends of the piston are connected to one another by a duct (22) extending parallel to the housing bore and including a throttle (23) and that two pressure limiting valves (33, 42) located in separate passages (26, 29, 39; 27, 30, 38) and in opposed directions are arranged in the piston.

2. A stabilizer according to claim 1, characterised in that, the pressure limiting valves are formed as spring-loaded plate valves.

3. A stabilizer for mechanical regulators substantially as herein described with reference to the accompanying drawings.