Installation structure of rotary vane steering gear

Abstract

The present invention provides an installation structure for a rotary vane steering gear that directly connects the rotary vane steering gear to the steering gear base, and that can detect oil leaks, seawater leaks, etc., to determine whether maintenance and inspection are necessary. [Solution] The assembly 100 of the steering gear body 10 and the steering gear base 30 has a leak detection unit 50 that detects oil leaks or seawater leaks occurring inside the machine. The leak detection unit 50 has a leak detection space 51 between the steering gear body 10 and the steering gear base 30 that covers the housing boss portion 12 and the plate boss portion 33. The leak detection unit 50 consists of a semi-solid lubricant that makes up a leak detection material 52 that fills the leak detection space 51, an outlet 54a provided in the housing 11 that leads to the leak detection space 51, and a safety valve 56 attached to the outlet 54a. The safety valve 56 has a set pressure that is lower than the pressure of the hydraulic oil inside the housing that acts on the lower shaft seal portion 13 as the operating pressure and the pressure of the seawater outside the steering gear base that acts on the rudder shaft seal portion 34.

Description

Technical Field

[0001] The present invention relates to a mounting structure of a rotary vane steering gear, and pertains to a technology for detecting oil leakage and seawater leakage.

Background Art

[0002] Conventionally, for example, there is one described in Patent Document 1. This is to pre-assemble a mounting base plate, a steering gear mounting base, and a steering gear into an integral combined body, and attach a deck seal material that slidably contacts the steering shaft in a watertight manner to the mounting base plate. This combined body is suspended in a state where the mounting base plate is loosely fitted into the fitting hole of the steering gear deck, and the steering shaft is joined to the steering gear. [[ID=,13]]

[0003] The steering shaft is positioned at an appropriate position in the vertical and horizontal directions, and the peripheral edge of the mounting base plate and the peripheral edge of the fitting hole of the steering gear deck are welded to mount the steering gear on the steering gear deck. Then, a rudder plate is attached to the lower end of the steering shaft.

[0004] The steering gear abuts against the mounting plate of the steering gear mounting base at the mounting flange, and the steering gear and the mounting base of the steering gear are fixed by fastening means, for example, reamer bolts. The steering gear mounting base is provided with a working hole for inspecting and maintaining the deck seal material on the steering gear deck. The housing houses a rotor inside, and the rotor has an internal through hole at its center, and the top end of the steering shaft is fitted and fixed to this internal through hole.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] Incidentally, in a typical piston-type steering gear, a tiller is attached to the tip of the rudder shaft that protrudes above the steering gear deck, and pressure cylinders are connected to both sides of the tiller to drive the rudder shaft. Therefore, the height of the rudder shaft that protrudes above the steering gear deck only needs to be sufficient to accommodate the rudder carrier and tiller.

[0007] However, in rotary vane steering gears, the rotor is mounted at the tip of the rudder shaft, creating a blind spot below the steering gear. This hinders the inspection of oil leaks from the steering gear and seawater leaks from the deck seals.

[0008] Therefore, in order to secure space for maintenance and inspection of the bottom of the steering gear and the deck seal material, it was necessary to interpose a steering gear mounting base between the steering gear and the mounting base. As a result, it was necessary to ensure that the rudder shaft had a redundant length to match the steering gear mounting base, which increased the cost of the rudder shaft, and it was also necessary to ensure that the ceiling height of the steering gear room was commensurate with the height of the rudder shaft.

[0009] The present invention aims to solve the above problems and to provide an installation structure for a rotary vane steering gear that directly connects the rotary vane steering gear to a steering gear stand mounted on the steering gear deck, which allows for the detection of oil leaks, seawater leaks, etc., to confirm whether maintenance inspection is necessary, and enables the shortening of the rudder shaft. [Means for solving the problem]

[0010] To solve the above problems, the rotary vane steering gear mounting structure of the present invention comprises a steering gear body having a rotor inside a housing that is fitted and fixed to the rudder shaft, a steering gear base fixed to the steering gear deck and joined to the steering gear body, and a leak detection unit that detects oil or seawater leakage occurring inside the assembly composed of the steering gear body and the steering gear base, the steering gear body having a housing boss portion at the bottom of the housing that holds the lower shaft portion of the rotor, and a lower shaft seal portion that liquid-tightly seals the space between the inner circumferential surface of the shaft hole of the housing boss portion and the lower shaft portion of the rotor, and the steering gear base having a mounting plate that surrounds the housing boss portion around the axis of the rudder shaft and abuts against the bottom surface of the housing, and the rudder shaft The steering gear has a retaining plate boss portion and a rudder shaft seal portion that liquid-tightly seals the space between the inner circumferential surface of the shaft hole of the plate boss portion and the rudder shaft. The leak detection portion forms a leak detection space between the steering gear body and the steering gear base that covers the housing boss portion and the plate boss portion, and consists of a recess provided in the steering gear base that surrounds the rudder shaft around its axis and is recessed in the direction of the rudder shaft's axis, a semi-solid lubricant that forms the leak detection material that fills the leak detection space, a discharge port provided in the housing that leads to the leak detection space, and a safety valve attached to the discharge port. The safety valve operates at a set pressure lower than the pressure of the hydraulic oil inside the housing that acts on the lower shaft seal portion and the pressure of the seawater outside the steering gear base that acts on the rudder shaft seal portion. In the event of a leak, either hydraulic fluid from the steering gear body leaking from the lower shaft seal into the leak detection space, or seawater leaking from the rudder shaft seal into the leak detection space, the pressure of the hydraulic fluid or seawater acts on the leak detection material, causing the safety valve to activate and the leak detection material mixed with the leak to seep out of the safety valve. This results in a visual warning message displayed outside the assembly as semi-solid lubricant mixed with the leak, indicating a leak within the assembly. It is characterized by the following:

[0012] The rotary vane steering gear mounting structure of the present invention is characterized in that there is a spigot portion between the housing bottom of the steering gear body and the mounting plate of the steering gear base for aligning the axes of the housing boss portion and the plate boss portion.

[0013] In the rotary vane type steering gear mounting structure of the present invention, the housing of the steering gear body has a housing positioning portion that protrudes radially in the direction of the rudder shaft on the mounting flange portion that abuts against the mounting plate, and the mounting plate has an adjuster portion that adjusts the position of the housing positioning portion around the axis of the rudder shaft. [Effects of the Invention]

[0014] With the above configuration, in the present invention, in the structure of an assembly that directly joins the steering gear body and the steering gear base, a leakage event occurs due to wear and deterioration of the lower shaft seal or rudder shaft seal, and the semi-solid lubricant of the leak detection material filling the leak detection space seeps out from the safety valve along with the mixed leak material under the pressure of the hydraulic oil or seawater when a leakage event occurs.

[0015] This event allows the leak detection unit to display a visual alarm outside the assembly as a semi-solid lubricant mixed with leaked material, indicating a leak inside the assembly. By visually checking the alarm information, it is possible to detect oil leaks, seawater leaks, etc., and confirm whether maintenance inspection is necessary.

[0016] Furthermore, by directly joining the steering gear body and the steering gear base to form an assembly, it is possible to shorten the rudder shaft, thereby reducing the cost of the rudder shaft and limiting the ceiling height of the steering gear room. [Brief explanation of the drawing]

[0017] [Figure 1] Overall cross-sectional view showing the installation structure of a rotary vane type steering wheel in an embodiment of the present invention. [Figure 2] Top view of the rotary vane steering mechanism in the same embodiment. [Figure 3] Top view of the housing in the same embodiment [Figure 4] Cross-sectional view showing the interior of the rotary vane type steering mechanism in the same embodiment. [Figure 5] Figure 1 shows the procedure for replacing the seal material of a rotary vane type steering machine in the same embodiment. [Figure 6] Figure 2 shows the procedure for replacing the seal material of a rotary vane type steering machine in the same embodiment. [Figure 7] Figure 3 shows the procedure for replacing the seal material of a rotary vane type steering machine in the same embodiment. [Figure 8] Figure 4 shows the procedure for replacing the seal material of a rotary vane type steering machine in the same embodiment. [Figure 9]FIG. 5 showing the seal material replacement procedure of the rotary vane type steering gear in the same embodiment [Figure 10] FIG. 6 showing the seal material replacement procedure of the rotary vane type steering gear in the same embodiment [Figure 11] FIG. 7 showing the seal material replacement procedure of the rotary vane type steering gear in the same embodiment

MODE FOR CARRYING OUT THE INVENTION

[0018] Hereinafter, the installation structure of the rotary vane type steering gear according to the present embodiment will be described based on the drawings. As shown in FIGS. 1 to 4, the assembly 100 constituting the installation structure of the rotary vane type steering gear includes a steering gear main body 10, a steering gear stand 30, and a leakage detection unit 50 as main components.

[0019] The steering gear main body 10 has a rotor 20 inside a housing 11. The rotor 20 is provided with an internal through hole 21 for fitting and fixing to the steering shaft 1, an upper rotor shaft portion 22, and a lower rotor shaft portion 23. The internal through hole 21 is tapered and fits into the steering shaft taper portion 2 of the steering shaft 1. A key groove 24 extending in the axial direction of the steering shaft 1 provided on the inner peripheral surface fits into the sliding key 3 provided on the steering shaft 1, and the internal through hole 21 is provided with an O-ring with backup 21a for sealing the space between the inner peripheral surface and the steering shaft 1.

[0020] The housing 11 has a housing boss portion 12 for holding the lower rotor shaft portion 23 at the bottom of the housing, and has a lower shaft seal portion 13 for sealing the space between the inner peripheral surface 12a of the shaft hole of the housing boss portion 12 and the lower rotor shaft portion 23 in a liquid-tight manner. Further, the annular housing lid portion 14 disposed at the upper opening of the housing 11 has a lid boss portion 15 for holding the upper rotor shaft portion 22, and has an upper shaft seal portion 16 for sealing the space between the inner peripheral surface 15a of the shaft hole of the lid boss portion 15 and the upper rotor shaft portion 22 in a liquid-tight manner. Furthermore, the housing boss portion 12 rotatably holds the lower rotor shaft portion 23 with a radial bearing material 12b and a thrust bearing material 12c, and the housing lid portion 14 rotatably holds the upper rotor shaft portion 22 with a radial bearing material 14a.

[0021] The rotor 20 has a plurality of vanes 25 on its outer circumference that extend in the axial direction of the rudder shaft 1, with the vanes 25 protruding radially from the rudder shaft 1. The housing 11 has segments 17 on its inner circumference that extend in the axial direction of the rudder shaft 1, with the segments 17 protruding radially from the rudder shaft 1. Sealing materials 25a and 17a are provided on the vanes 25 and segments 17, respectively. An oil chamber 26 is formed between each vane 25 and each segment 17.

[0022] The lower shaft seal portion 13 includes a gland packing 13a wrapped around the rotor lower shaft portion 23, a lower gland retainer 13b, a fixing bolt 13c, and a lower gland seal 13d with a backup ring provided on the inner circumferential surface of the lower gland retainer 13b.

[0023] The upper shaft seal portion 16 includes a gland packing 16a wrapped around the rotor upper shaft portion 22, an upper gland retainer 16b, a fixing bolt 16c, and an upper gland seal 16d with a backup ring provided on the inner circumferential surface of the upper gland retainer 16b.

[0024] The housing 11 has an annular mounting flange portion 18 that extends radially in the direction of the rudder shaft 1 on the lower part of its outer circumferential surface, and is joined to the steering gear base 30 by mounting bolts 19 that are inserted into drilled holes 18a provided in the mounting flange portion 18.

[0025] The steering gear base 30 is fixed to the steering gear deck 31 and has a mounting plate 32 that surrounds the housing boss portion 12 of the steering gear body 10 around the axis of the rudder shaft 1 and contacts the housing bottom surface and mounting flange portion 18, a plate boss portion 33 that holds the rudder shaft 1, and a rudder shaft seal portion 34 that liquid-tightly seals the space between the inner circumferential surface 33a of the shaft hole of the plate boss portion 33 and the rudder shaft 1. The rudder shaft seal portion 34 has a shaft seal 34a, a seal retainer 34b, and a fixing bolt 34c, and a rudder trunk 35 is connected to the bottom surface of the steering gear base 30.

[0026] Furthermore, the steering gear body 10 has a housing bottom and a mounting plate 32 of the steering gear base 30, with a spigot joint 36 for aligning the axes of the housing boss 12 and the plate boss 33. In the spigot joint 36, an annular recess 32a provided in the mounting plate 32 fits into the outer circumferential surface of the housing boss 12.

[0027] The housing 11 has a housing positioning portion 18b that protrudes radially from the mounting flange portion 18, and the mounting flange portion 18 has a shape in which both sides of the housing positioning portion 18b are cut out. The mounting plate 32 has an adjuster portion (rotation stopper bolt) 37 for adjusting the position of the housing positioning portion 18b around the axis of the rudder shaft 1.

[0028] The rudder shaft 1 has an oil passage 2a extending from the outer circumferential surface of the rudder shaft tapered portion 2, and the pressure acting on the oil passage 2a expands the inner diameter of the internal through hole 21 of the rotor 20. A hydraulic nut 4 is attached to the head of the rudder shaft 1, and the hydraulic nut 4 contains a hydraulic jack 4a. A lock plate 5 is attached to the top end of the rudder shaft 1, and the lock plate 5 is fixed to the rudder shaft 1 and the hydraulic nut 4 with multiple fixing bolts 6 to prevent the hydraulic nut 4 from loosening.

[0029] The leak detection unit 50 detects oil or seawater leaks occurring inside the assembly 100, which is composed of the steering gear body 10 and the steering gear base 30. The leak detection unit 50 has a leak detection space 51 formed between the steering gear body 10 and the steering gear base 30. The leak detection space 51 consists of a recess 38 provided in the steering gear base 30, which surrounds the rudder shaft 1 around its axis, recesses in the axial direction of the rudder shaft 1, and covers the housing boss portion 12 and the plate boss portion 33.

[0030] The leak detection space 51 is filled with a semi-solid lubricant that forms the leak detection material 52, and in this case, grease is used as the leak detection material 52. The leak detection unit 50 includes a filling passage 53 and a discharge passage 54 formed at the bottom of the housing 11 and leading to the leak detection space 52, a grease nipple 55 attached to the filling port 53a of the filling passage 53 which opens to the outer circumferential surface of the mounting flange portion 18, and a safety valve 56 attached to the discharge port 54a of the discharge passage 54.

[0031] The safety valve 56 has a set operating pressure lower than the pressure of the hydraulic fluid inside the housing acting on the lower shaft seal 13 and the pressure of the seawater outside the steering gear base acting on the rudder shaft seal. The leak detection material 52 also has a filling pressure lower than the set pressure of the safety valve 56.

[0032] The leak detection unit 50 detects a leak event in which hydraulic fluid from the steering gear body 10 leaks from the lower shaft seal 13 into the leak detection space 51, or seawater leaking from the rudder shaft seal 34 into the leak detection space 51 mixes with the leak detection material 52 as leak material. The pressure of the hydraulic fluid or seawater acts on the leak detection material 52, causing the safety valve 56 to activate and the leak detection material 52 mixed with the leak material to seep out of the safety valve 56. This displays the leak event inside the assembly 100 as a visual alarm information outside the assembly 100, showing the leak material mixed with semi-solid lubricant.

[0033] The following explains the function of the above configuration.

[0034] The rotor 20 rotates integrally with the rudder shaft 1 around its axis, under the pressure of the hydraulic fluid filling the oil chamber 26 between the vanes 25 and the segments 17, thereby steering the rudder to port and starboard.

[0035] The operating pressure of the safety valve 56 is set to a pressure lower than the pressure of the hydraulic fluid inside the housing acting on the lower shaft seal 13 and the pressure of the seawater outside the steering gear base acting on the rudder shaft seal 34. The filling pressure of the leak detection material 52 is also lower than the pressure of the hydraulic fluid and the pressure of the seawater.

[0036] Therefore, if a leak occurs in the lower shaft seal section 13 or the rudder shaft seal section 34 due to wear or deterioration of the gland packing 13a, lower gland seal 13d, shaft seal 34a, etc., the hydraulic oil inside the oil chamber 26 or the seawater filling the rudder trunk 35 will leak into the leak detection section 51 due to the pressure of the hydraulic oil or the seawater, and will mix with the semi-solid lubricant of the leak detection material 52 that fills the leak detection space 51, causing the pressure of the hydraulic oil or the seawater to act on the leak detection material 52.

[0037] Under these leakage conditions, the semi-solid lubricant of the leak detection material 52 seeps out of the safety valve 56 along with the leaked material due to the pressure of the hydraulic fluid and the pressure of the seawater.

[0038] As a result of this event, the leak detection unit 51 can display the leakage event inside the assembly 100 as a visual alarm information outside the assembly 100, showing the leaked material mixed with the semi-solid lubricant. By visually checking the alarm information, it is possible to detect oil leaks, seawater leaks, etc., and confirm whether maintenance inspection is necessary.

[0039] Furthermore, by directly joining the steering gear body 10 and the steering gear base 30 to form an assembly 100, it is possible to shorten the length of the rudder shaft 1, thereby reducing the cost of the rudder shaft 1 and suppressing the ceiling height of the steering gear room.

[0040] If an oil leak, seawater leak, or other issue is detected by visually inspecting the alarm information and maintenance is deemed necessary, the gland packing 13a, lower gland seal 13d, and shaft seal 34a in the lower shaft seal section 13 or the rudder shaft seal section 34 shall be replaced. The procedure for replacing seals at sea or in dry dock is described below.

[0041] Step 1 (See Figure 5) 1. Remove the grease nipple 55 and the safety valve 56 on the opposite side, and use an air blower 61 to expel the sealed grease. 2. Remove the lock plate 5 and fixing bolt 6, and attach the hose of the hydraulic pump 62 for rudder shaft separation to the oil passage 2a of the rudder shaft 1. 3. By loosening the hydraulic nut 4 by approximately 3 mm and then gradually increasing the hydraulic pressure of the hydraulic pump 62, the rudder plate (not shown) and rudder shaft 1 will fall and separate by approximately 3 mm due to their own weight.

[0042] Step 2 (See Figure 6) 4. A swivel eyebolt 63 is attached to the rudder shaft 1, and the rudder plate and rudder shaft 1 are suspended and held in place by a rope 64. An eyebolt 65 is attached to the steering gear body 10. 5. Remove the mounting bolt 19.

[0043] Step 3 (See Figure 7) 6. Loosen the hydraulic nut 4 and remove it from the rudder shaft 1. With the hydraulic nut 4 resting on the top surface of the steering gear body 10, lift the steering gear body 10 straight up using the rope 66 connected to the eyebolt 65. At this time, if the lifting height is too large, the slip key 3 will come out of the keyway 24, and the rudder shaft 1 will be rotated by the force of the waves, so care must be taken when realigning the key during reassembly. 7. Remove the old lower gland seal 13b or shaft seal 34a and install a new seal by bonding. Alternatively, replace the gland packing 13a.

[0044] Step 4 (See Figure 8) 8. After replacing the lower ground seal 13b or the rudder shaft seal 34a, etc., restore the system using the following procedure. 9. The steering gear body 10 is suspended along with the hydraulic nut 4, aligning the keyway 24 with the sliding key 3. As the suspension progresses, the hydraulic nut 4 will come into contact with the rudder shaft 1. At that point, the hydraulic nut 4 is screwed onto the rudder shaft 1, and the steering gear body 10 is suspended and placed on the steering gear stand 30.

[0045] Step 5 (See Figure 9) 10. Lift the rudder shaft 1 and raise the steering gear body 10 to about 5 mm above the mounting surface of the steering gear base 30. If the hydraulic nut 4 is loose, tighten it by hand. Apply the entire mass of the steering gear body 10 to the rudder shaft 1. 11. To connect the rudder shaft 1 and the rotor 20, attach the hose of the hydraulic pump 62 and the dial gauge 67 to the hydraulic nut 4. 12. Using the skin-contact state described in the previous section as the starting point for coupling, the pressure of the hydraulic pump 62 is increased by dry pull-up until the set amount of indentation is reached, thereby activating the hydraulic jack 4a.

[0046] Step 6 (See Figure 10) 13. Remove the hydraulic pump 62 and the dial gauge 67. 14. Fully retract the piston of the hydraulic jack 4a that was pushed out during the pushing operation, and tighten the hydraulic nut 4 until the bottom surface of the hydraulic nut 4 touches the top surface of the rotor 20. 15. Align the bow marks on the steering gear body 10 and the steering gear base 30, place the steering gear body 10 on the steering gear base 30, and adjust and fix the circumferential position of the rudder shaft 1 on the housing positioning section 18b using the rotation-stopping bolts of the adjuster section 37. This allows for accurate and easy alignment of the steering gear body 10 and the steering gear base 30 without using reamer bolts for joining them. Then, insert the mounting bolts 19 into the drilled holes 18a of the mounting flange section 18, and join and fix the steering gear body 10 and the steering gear base 30 with the mounting bolts 19.

[0047] Step 7 (See Figure 11) 16. Remove the adjustable eyebolts 63 and 65, and fix the hydraulic nut 4 to the rudder shaft 1 using the lock plate 5 and fixing bolt 6. 17. Attach the grease nipple 55 and the safety valve 56, and inject grease from the grease nipple side until grease comes out of the safety valve 56. 18. End [Explanation of Symbols]

[0048] 1 rudder axle 2. Rudder shaft tapered section 2a Oil road 3 Slip Keys 4. Hydraulic nut 4a Hydraulic jack 5 Lock Plate 6 Fixing bolts 10 Steering gear body 11 Housing 12 Housing Boss Section 12a Inner surface of shaft hole 12b Radial bearing material 12c thrust bearing material 13 Lower shaft seal 13a Gland Packing 13b Lower ground retainer 13c fixing bolt 13d Lower ground seal 14 Housing cover 14a Radial bearing material 15 Lid boss section 15a Inner surface of shaft hole 16 Upper shaft seal 16a Gland Packing 16b Upper ground retainer 16c fixing bolt 16d Upper ground seal 17 segments 17a, 25a sealing material 18 Installation flange section 18a Drill hole 18b Housing positioning section 19 Installation bolts 20 rotors 21 Internal through-hole 21a O-ring 22. Upper shaft section of the rotor 23. Lower shaft section of the rotor 24 keyways 25 Bane 26 Oil room 30 Steering gear platform 31 Steering machine deck 32 Mounting Plate 32a Annular recess 33 Plate boss section 33a Inner surface of shaft hole 34. Rudder shaft seal section 34a Axle seal 34b Seal holder 34c fixing bolt 35 Ladder Trunk 36 Inner part 37 Adjuster part 38 Recessed area 50 Leak detection unit 51 Leak detection space 52 Leak detection material 53 Filling path 53a Filling port 54 Exhaust channel 54a Outlet 55 Grease Nipple 56 Safety valve 61 Air blow 62 Hydraulic pump 63 Adjustable eye bolt 64, 66 scheme 65 Eyebolt 67 Dial Gauge 100 assemblies

Claims

1. The steering gear body has a rotor inside the housing that fits and is fixed to the rudder shaft, a steering gear stand fixed to the steering gear deck and joined to the steering gear body, and a leak detection unit that detects oil or seawater leaks occurring inside the assembly made up of the steering gear body and the steering gear stand. The steering gear body has a housing boss portion at the bottom of the housing that holds the lower shaft portion of the rotor, and a lower shaft seal portion that provides a liquid-tight seal between the inner circumferential surface of the shaft hole of the housing boss portion and the lower shaft portion of the rotor. The steering gear mount has a mounting plate that surrounds the housing boss portion around the axis of the rudder shaft and abuts against the bottom surface of the housing, a plate boss portion that holds the rudder shaft, and a rudder shaft seal portion that provides a liquid-tight seal between the inner circumferential surface of the shaft hole of the plate boss portion and the rudder shaft. The leak detection unit forms a leak detection space between the steering gear body and the steering gear base, covering the housing boss and plate boss. It consists of a recess in the steering gear base that surrounds the rudder shaft around its axis and recesses in the direction of the rudder shaft's axis, a semi-solid lubricant that fills the leak detection space as a leak detection material, a discharge port provided in the housing that leads to the leak detection space, and a safety valve attached to the discharge port. The safety valve has a set pressure lower than the pressure of the hydraulic fluid inside the housing acting on the lower shaft seal and the pressure of the seawater outside the steering gear base acting on the rudder shaft seal. A rotary vane type steering gear installation structure characterized by the following: under the condition of a leak event in which hydraulic oil from the steering gear body leaks from the lower shaft seal into the leak detection space, or seawater leaks from the rudder shaft seal into the leak detection space, the pressure of the hydraulic oil or the pressure of the seawater acts on the leak detection material, causing the safety valve to activate and the leak detection material mixed with the leak to seep out of the safety valve, thereby displaying the leak event inside the assembly as a visual warning information outside the assembly, showing the leak mixed with the leak in a semi-solid lubricant.

2. The installation structure for a rotary vane type steering gear according to claim 1, characterized in that it has a spigot joint between the housing bottom of the steering gear body and the mounting plate of the steering gear base for aligning the axes of the housing boss and the plate boss.

3. The mounting structure for a rotary vane type steering gear according to claim 1, characterized in that the housing of the steering gear body has a housing positioning portion that protrudes radially in the direction of the rudder shaft on the mounting flange portion that abuts against the mounting plate, and the mounting plate has an adjuster portion for adjusting the position of the housing positioning portion around the axis of the rudder shaft.

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