GB2025875A - Improvements in or Relating to Steering Gear for Ships - Google Patents
Improvements in or Relating to Steering Gear for Ships Download PDFInfo
- Publication number
- GB2025875A GB2025875A GB7924740A GB7924740A GB2025875A GB 2025875 A GB2025875 A GB 2025875A GB 7924740 A GB7924740 A GB 7924740A GB 7924740 A GB7924740 A GB 7924740A GB 2025875 A GB2025875 A GB 2025875A
- Authority
- GB
- United Kingdom
- Prior art keywords
- liquid system
- auxiliary
- pressure
- pump
- operated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
- F15B20/004—Fluid pressure supply failure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H25/00—Steering; Slowing-down otherwise than by use of propulsive elements; Dynamic anchoring, i.e. positioning vessels by means of main or auxiliary propulsive elements
- B63H25/06—Steering by rudders
- B63H25/08—Steering gear
- B63H25/14—Steering gear power assisted; power driven, i.e. using steering engine
- B63H25/26—Steering engines
- B63H25/28—Steering engines of fluid type
- B63H25/30—Steering engines of fluid type hydraulic
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
- F15B20/005—Leakage; Spillage; Hose burst
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Ocean & Marine Engineering (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
A ship's steering gear incorporates a main operating liquid system (8) and an auxiliary operating system (12) which are alternatively pressurizable and pressure loaded valves (13, 14, 15, 16) arranged to connect selectively the main liquid system or the auxiliary liquid system to the thruster devices (2, 3, 4, 5) coupled to the rudder stock according to whether the valves are unoperated or operated respectively, said valves being connected to the auxiliary liquid system to receive their loading pressure therefrom. Means are also provided for pressurizing the auxiliary system automatically on failure of pressure in the main liquid system. <IMAGE>
Description
SPECIFICATION
Improvements in or Relating to Steering Gear for Ships
This invention relates to steering gear for ships and particularly to steering gear of the type in which liquid under pressure is used as the medium for applying the steering force.
A ship's steering gear employing liquid under pressure customarily incorporates a rudder having a stock which is connected to thrusters incorporating cylinders and pistons in such a way that movements of the pistons are communicated to the rudder stock as rotational movement. It is customary in such installations to provide two pumps for feeding liquid under pressure into an operating liquid system connected to the thrusters. The two pumps are normally connected into the operating liquid system in such a way that either pump can be shut off leaving the other pump to provide the pressure, this method of operation being employed in normally calm conditions where full steering power is not required or both pumps may be used to supply the system in parallel where full steering power is required.The two pumps also have the effect of providing that either pump can act as a standby if the other should break down. In such a system the pumps are reversible variable delivery pumps, the direction of rotation and the amount of delivery being controlled by the steering control.
The pumps are so connected that there is only one liquid-carrying conduit to each cylinder, that conduit acting as a means of conducting liquid under pressure to the cylinder or for discharge of liquid from the cylinder according to the direction of rotation of the pumps which act in unison when both are in operation. In such a system if a leak should occur in any part of the system the operating fluid flows out of the system and pressure and steering power are lost.
It is an object of the present invention to provide a steering gear in which steering power is still available after occurrence of a leak in any part of the normal liquid system.
According to the invention a ship's steering gear of the type having liquid pressure operated thruster devices arranged for connection to a rudder stock incorporates a main operating liquid system, an auxiliary operating liquid system, said systems being alternatively pressurizable, a pressure operated valve in a conduit leading to each thruster device, each of said pressure operated valves being connected to the main liquid system and to the auxiliary liquid system and being arranged when unoperated to provide a liquid flow connection between the main liquid system only and the thruster devices and when operated to provide a liquid flow connection between the auxiliary liquid system only and the thruster devices, said pressure operated valves
being connected to the auxiliary liquid system to
receive operating pressure when said auxiliary system is pressurized, and steering control means operative to control the direction of flow of operating liquid between the thruster devices and whichever liquid system is pressurized.
The auxiliary liquid system may include an unidirectional pump the suction and discharge connections of which are connected to the auxiliary liquid system by way of a changeover valve operative under control of the steering control means to connect the discharge connection and the suction connection of the pump to the appropriate thruster devices to provide the steering action required.
Alternatively the auxiliary liquid system may include a reversible delivery pump having two outlets each of which can be made to function alternatively as a discharge and a suction outlet according to the immediate direction of liquid flow required by the steering control and a pressure operated shuttle valve connected to the pump outlets to be movable to one or other of two operative settings according to the pump outlet which is discharging at any instant and thereupon to connect that pump outlet to the pressure loaded valves in the conduits leading to the thruster devices to maintain said valves in the operated state.
The gear may incorporate a pressure operated clutch device arranged to be operated when the auxiliary liquid systen is pressurized to connect the steering control means and means for controlling the direction of liquid flow in the auxiliary liquid system and pressure loaded switch means arranged to control the power supply to the auxiliary pump, said switch means being loaded by the pressure in the main liquid system so that it is normally held in the open position while there is pressure in the main liquid system but is arranged to close on failure of pressure in the main liquid system. By this arrangement failure of pressure in the main liquid system caused an automatic change over to the auxiliary steering gear.
The thruster devices are customarily cylinder and piston units but other types of thruster devices may be employed, for example rotary thruster devices.
In most cases pumps are the most convenient means for pressurizing the liquid systems but the gear of the invention is operable with other methods of pressurizing the liquid systems.
A practical embodiment of the invention is illustrated diagrammatically in the accompanying drawing in which 1 denotes a rudder stock to which are coupled cylinders 2, 3, 4, and 5 constituting thruster devices. 6 and 7 denote main reversible variable output pumps discharging to a main liquid system 8 as the means for feeding and discharging the cylinders 2, 3, 4, 5. The arrangement is such that according to the direction of rotation of the pumps as determined by the steering control liquid is fed under pressure to the cylinders 2 and 5 and at the same time liquid is discharged from the cylinders 3 and 4 or liquid is fed under pressure to the cylinders 3 and 4 and at the same time liquid is discharged from the cylinders 2 and 5. 9 denotes an auxiliary pumping installation.The pump 10 is an uni-directional pump and discharges by way of a changeover valve 11 of the shuttle type to an auxiliary liquid system 12. The auxiliary liquid system 12 and the main liquid system 8 are connected to the respective cylinders by way of pressure operated valves 13, 14, 1 5 and 1 6.
These valves are so arranged that in the unoperated condition they connect the main liquid system to the cylinders 2, 3, 4 and 5 and provide no connection from the auxiliary liquid system 12 to the said cylinders and in the operated condition they connect the auxiliary liquid system 12 to the cylinders and provide no connection from the main liquid system 8 to the cylinders. The valves are connected into the discharge line of the pump 10 at a point between the pump 10 and the changeover valve 11 so that they are operated by the pressure provided by the auxiliary pump 10. The main liquid system 8 incorporates stop valve 1 7 which can be used to isolate either or both pumps 6 and 7 from the main liquid system 8.The changeover valve 11 may be operable by push buttons or may be connectible to the normal steering control. The valve 11 is arranged to change over the pressure and suction branches of the pump 10 i.e. to reverse the connections of the pressure and the suction branches of the pump lotto the two outgoing lines of the auxiliary liquid system 12.
1 8 and 1 9 denote shock and by-pass valves which are operable to relieve excess pressure developing in one of the cylinders or to provide a permanent connection between the associated opposed cylinders if it should become necessary to render inoperative the thruster device constituted by one of opposed cylinders.
in practice, normally in calm weather conditions one or other of the pumps 6, 7 is running with the other pump closed down on stand by. This is done by manipulating the appropriate stop valves 17. The pump in use then supplies liquid under pressure to all four cylinders 2, 3, 4 and 5 and steering is performed on
reduced thrust. When greater steering power is
required the pumps 6 and 7 operate together in parallel. During operation of the pumps 6 and 7 the auxiliary pump installation 9 is inoperative and there is no pressure in the auxiliary liquid system 12. The valves 13, 14, 15 and 16 are then
in the unoperated setting so that the main liquid system 8 is in communication with the cylinders 2, 3, 4 and 5.If a leak should develop in the main liquid system 8 the auxiliary pump installation 9 is set in operation and the pressure generated in the auxiliary liquid system 12, applied to the valves
13, 14, 1 5 and 16, moves these valves to the operated setting disconnecting the system 8 from the cylinders 2, 3, 4, 5 and connecting the auxiliary liquid system 12 to the said cylinders.
Steering is performed by moving the changeover valve 11 from one extreme setting to the other thus making the line which was previously under pressure the suction line and the previous suction
line becoming the line under pressure. Steering is then effected in exactly the same manner by use of the changeover valve 11 as by the pumps 6, 7.
Since the pump 10 is an uni-directionai pump and the valves 13, 14, 1 5 and 1 6 are connected directly to the discharge of that pump these valves always remain operated when the pump 10 is in operation irrespective of the position of the changeover valve 11.
Claims (5)
1. A ship's steering gear of the type having liquid pressure operated thruster devices arranged for connection to a rudder stock incorporates a main operating liquid system, an auxiliary operating liquid system, said systems being alternatively pressurizable, a pressure operated valve in a conduit leading to each thruster device, each of said pressure operated valves being connected to the main liquid system and to the auxiliary liquid system and being arranged when unoperated to provide a liquid flow connection between the main liquid system only and the thruster devices and when operated to provide a liquid flow connection between the auxiliary liquid system only and the thruster devices, said pressure operated valves being connected to the auxiliary liquid system to receive operating pressure when said auxiliary system is pressurized, and steering control means operative to control the direction of flow of operating liquid between the thruster devices and whichever liquid system is pressurized.
2. A ship's steering gear as claimed in claim 1 in which the auxiliary liquid system includes an uni-directional pump the suction and discharge connections of which are connected to the auxiliary liquid system by way of a changeover valve operative under control of the steering control means to connect the discharge connection and the suction connection of the pump to the appropriate thruster devices to provide the steering action required.
3. A ship's steering gear as claimed in claim 1 in which the auxiliary liquid system includes a reversible delivery pump having two outlets each of which functions alternatively as a discharge and a suction outlet according to the particular operating conditions set by the steering control and a pressure operated shuttle valve connected to the two pump outlets to be movable to one or other of two operative settings according to the pump outlet which is the discharge outlet at any instant and thereupon to connect that pump outlet to the pressure loaded valves in the conduits leading to the thruster device to maintain said valves in the operated state.
4. A ship's steering gear as claimed in claim 1 incorporating a pressure operated clutch device arranged to be operated when the auxiliary liquid system is pressurized to connect the steering control means and means for controlling the direction of liquid flow in the auxiliary liquid system and pressure loaded switch means arranged to control the power supply to the auxiliary pump, said switch means being loaded by the pressure in the main liquid system so that it is normally held in the open position while there is pressure in the main liquid system but is arranged to close on failure of pressure in the main liquid system.
5. A ship's steering gear substantially as described with reference to the accompanying drawing and as claimed in claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7924740A GB2025875A (en) | 1978-07-21 | 1979-07-16 | Improvements in or Relating to Steering Gear for Ships |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7830759 | 1978-07-21 | ||
| GB7924740A GB2025875A (en) | 1978-07-21 | 1979-07-16 | Improvements in or Relating to Steering Gear for Ships |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2025875A true GB2025875A (en) | 1980-01-30 |
Family
ID=26268299
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7924740A Withdrawn GB2025875A (en) | 1978-07-21 | 1979-07-16 | Improvements in or Relating to Steering Gear for Ships |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2025875A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102636212A (en) * | 2012-04-05 | 2012-08-15 | 江苏吉信远望船舶设备有限公司 | Test bench with adjustable steering gear base |
| US8689715B2 (en) | 2009-11-19 | 2014-04-08 | Mactaggart, Scott (Holdings) Limited | Actuator |
| CN104833501A (en) * | 2015-05-13 | 2015-08-12 | 广西梧州运龙港船机械制造有限公司 | Steering engine base testboard frame |
| CN105247226A (en) * | 2014-02-13 | 2016-01-13 | 麦基嘉哈特拉帕两合公司 | Rudder driving system and method |
-
1979
- 1979-07-16 GB GB7924740A patent/GB2025875A/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8689715B2 (en) | 2009-11-19 | 2014-04-08 | Mactaggart, Scott (Holdings) Limited | Actuator |
| EP2325080B1 (en) * | 2009-11-19 | 2016-08-10 | MacTaggart Scott (Holdings) Ltd. | Actuator |
| CN102636212A (en) * | 2012-04-05 | 2012-08-15 | 江苏吉信远望船舶设备有限公司 | Test bench with adjustable steering gear base |
| CN105247226A (en) * | 2014-02-13 | 2016-01-13 | 麦基嘉哈特拉帕两合公司 | Rudder driving system and method |
| JP2016518288A (en) * | 2014-02-13 | 2016-06-23 | マクレガー ハトラパ ゲーエムベーハー ウント コンパニー カーゲー | Rudder drive system and steering machine operating method |
| CN104833501A (en) * | 2015-05-13 | 2015-08-12 | 广西梧州运龙港船机械制造有限公司 | Steering engine base testboard frame |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |