JPH02158496A - Steering unit - Google Patents

Abstract

PURPOSE:To ensure a smooth action by a method wherein a slide ring is loosely engaged with the outer periphery of a reciprocation type hydraulic cylinder and is coupled to a coupling disc coupled to the tip of a piston rod through a plurality of connecting rods, and movement of the slide ring is transmitted to a steering handle through a link. CONSTITUTION:A hydraulic cylinder 5 provided at the front and the rear with piston rods 6 and 6' is mounted to a mounting bed 12, mounted to a ship hull, by means of a mounting bolt 13, and a slide ring 20 is slidably engaged with the outer periphery of the hydraulic cylinder 5. Two coupling rods 9 extended in parallel to a front piston rod 6 are threadedly joined on the front end surface side of the slide ring 20, and a coupling disc 10 is mounted to the tips of the coupling rods 9. The one end of a link 21 is pivotally mounted at 8 to the slide ring 20, and the other end is pivotally mounted at 8 to a steering handle arm 4 of a steering handle 2 key-coupled to a steering shaft 1. This constitution enables distribution of a load, exerted on the piston rods 6 and 6', to the coupling rod 9 and prevents buckling of the hydraulic cylinder 5 and the damage of a rod seal and a piston seal.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a steering gear for a ship, and particularly to a steering gear used for wide rudder angle steering.

[Conventional technology]

Normally, the steering angle range of a steering gear on a ship is from 35° to starboard.
The range is 35° on the port side, but recently ships' side-to-side positioning has been
For the purpose of improving purging performance), the starboard side is approximately 70°~
A wide rudder angle steering gear having a rudder angle range of about 70'' on the port side is required.

Conventionally, steering gears that perform wide rudder angle steering have two
It is equipped with hydraulic cylinders and their operating hydraulic circuits.

More specifically, as shown in the plan view of FIG. 5 and the side view of FIG. 6, a rudder shaft 01 directly connected to a rudder plate (not shown) is coupled to a rudder handle 02 by a key 03.

On the outer periphery of the rudder handle 02, there is a rudder handle arm 04 extending in the diametrical direction.
These two rudder arms 04 are the piston rods 06a of the hydraulic cylinders 05a and 05b, respectively.

06b via a spherical bearing 07.

The rear ends of the hydraulic cylinders 05a, 05b are rotatably attached to the support portion of the ship body via spherical bearings 07 at their clevises 08.

The hydraulic circuit that supplies and discharges pressure oil to the hydraulic cylinders 05a and 05b includes a hydraulic pump 09 driven by a motor M, and the pressure oil sent from the hydraulic pump 09 to the two hydraulic cylinders 05m and 05b. , and a directional switching valve 010 that returns the supplied pressure oil to the tank T, and piping 011 that interconnects these.

Boat A of the directional switching valve 010 is connected to the head side boat of one hydraulic cylinder 05a and the rod side boat of the other hydraulic cylinder 05b via piping, and is also connected to the boat B of the directional switching valve 010.
are respectively connected to the rod side boat of one hydraulic cylinder 05a and the head side boat of the other hydraulic cylinder 05b via piping.

In the conventional steering gear configured in this way, as shown in FIG.
It is supplied to the rod side boat of the hydraulic cylinder 5a and the head side boat of the other hydraulic cylinder 05b.

When such pressure oil is supplied, the piston rod 06a of one hydraulic cylinder 05a is in a contracted state as shown in the figure, and the piston rod 06b of the other hydraulic cylinder 05b is in an extended state.

In this state, the rudder has taken a rudder angle of 70° to port.

12 hydraulic cylinders 05a, 05b are required. That is, the head side boat of one hydraulic cylinder 05a and the rod side boat of the other hydraulic cylinder 05b, and the rod side boat of one hydraulic cylinder 05a and the head side boat of the other hydraulic cylinder 05b are connected by piping as described above. However, in starboard steering and port steering, it is necessary to supply pressure oil to each hydraulic cylinder 010 so that the amount of oil supplied per unit time is the same.

(3) When the rudder angle reaches a large rudder angle of approximately 70°, as shown in FIG.
It is easier to contact the outside of the On the other hand, if the rudder arm 04 is lengthened to avoid such contact, it becomes necessary to lengthen the piston rods 06a, 06b correspondingly, making the piston rods 06a, 06b more likely to buckle.

(4) Two long hydraulic cylinders 05a and 05b
Due to the need for actual installation, a correspondingly large installation space is required.

The present invention attempts to solve these problems. Conversely, when the directional control valve 010 is switched to the power position, pressure oil is supplied in the opposite manner to that described above, and one hydraulic cylinder 05a is supplied with pressure oil.
is extended as shown by the dotted line in the figure, and the rudder assumes a rudder angle of 70° to port.

Note that the position of the other hydraulic cylinder 05b in this case is not shown.

[Problem to be solved by the invention]

By the way, the conventional steering gear as described above has the following problems.

(1) Since the piston rods 06a and 06b receive a compressive load due to the load force from the steering plate and the operating hydraulic pressure, the elongated piston rods 06a and 06b are likely to buckle when extended to the maximum. Furthermore, the seals (provided inside the hydraulic cylinders 05a, 051+) between the hydraulic cylinders 05a, 05b and the piston rods 06a, 06b are likely to be damaged by lateral loads that cause buckling.

(2) Rotational speed of rudder 02 (or hydraulic cylinder 0
5a and 05b), it prevents piston rod buckling and seal damage, eliminates the need for two hydraulic cylinders, and allows the piston rod to It is an object of the present invention to provide a steering gear that avoids contact between the steering gear and the steering gear, and also reduces the installation space.

[Means to solve the problem]

In order to achieve the above object, the steering gear of the present invention includes a hydraulic cylinder fixed to the hull, a connecting plate whose central part is attached to the tip of the piston rod of the hydraulic cylinder, and a connecting plate attached to the outer periphery of the hydraulic cylinder. A sliding ring that can be fitted and slid in the axial direction of the hydraulic cylinder, and a plurality of connecting rods that extend from the sliding ring in parallel with the piston rod and have each tip attached to the connecting plate. The present invention is characterized in that a link is provided, one end of which is pivotally connected to the sliding ring, and the other end of which is pivotally connected to the rudder handle.

[For production]

The steering gear of the present invention described above includes a sliding ring that fits on the outer periphery of the hydraulic cylinder and can slide in the axial direction of the hydraulic cylinder;
A connecting rod extends from the sliding ring parallel to the piston rod of the hydraulic cylinder and is connected to the piston rod via a connecting plate, and one end of the connecting rod is pivotally connected to the sliding ring to prevent the movement when the piston rod expands and contracts. At the same time, the other end is transmitted to a link pivotally connected to the rudder handle, which acts to rotate the rudder shaft over a sufficiently large angle range, and also shares and disperses a part of the bending load applied to the screw rod. It acts on

〔Example〕

Next, to explain an embodiment of the present invention, Figs. 1 to 4 show a steering gear as an embodiment of the present invention.
2 is a side view of the circuit, FIG. 3 is a longitudinal sectional view of the hydraulic cylinder, and FIG. 4 is a view taken along the line IV--IV in FIG. 3.

As shown in Figures 1 to 4 (hereinafter, see Figures 1 and 2 for the overall configuration and Figures 3 and 4 for the detailed configuration), a steering gear as an embodiment of the present invention is installed in the hull. A directional control valve 10 for returning oil from a hydraulic cylinder 5 to a tank T and a pipe 16 for interconnecting these are provided.

In this hydraulic circuit, boat A and boat B of directional control valve 10 are simply connected to boat L and boat R of hydraulic cylinder 5, respectively.

In addition, in FIGS. 1 to 4, reference numeral 3 is a key connecting the rudder handle 2 and rudder shaft 1, 7 is a bearing, 14.15 is a rod seal,
19 indicates a piston seal.

The steering gear configured in this manner performs the following operations.

(1) When the rudder shaft 1 is at the neutral position N with a steering angle of 0°, the piston 18 of the hydraulic cylinder 5 is located approximately at the center of the cylinder, and the directional control valve 10 maintains the position (■).

(2) When rotating the rudder shaft 1 to about 70° to port, the directional control valve 10 is switched to the position (■), and the pressure oil from the hydraulic pump 9 is transferred from the boat B of the directional control valve 10 to the hydraulic pressure via the piping 16. It is fed under pressure to the boat R of cylinder 5. The piston 18 is then pushed to the left in the figure and has a defined hydraulic cylinder 5.

This hydraulic cylinder 5 is provided with a front piston rod 6 and a rear piston rod 6' in front and behind the piston 18, and a connecting plate 1 is provided at the tip of the front piston rod 6.
0 is attached at the center with a mounting bolt 11.

On the other hand, a sliding ring 20 is fitted onto the outer periphery of the hydraulic cylinder 5 so as to be able to slide in the axial direction of the hydraulic cylinder 5. Two connecting rods 9 extend parallel to the piston rod 6.
is provided. The tips of these connecting rods 9 are attached to both ends of the connecting plate 10.

A link 21 is pivotally connected to one end of the sliding ring 20 through a pin 8, and the other end of the link 21 is pivotally connected to a rudder handle arm 4 connected to the rudder handle 2 through a pin 8. ing.

The hydraulic circuit that operates the steering gear configured in this way is
A hydraulic pump 9 driven by a motor M supplies pressure oil from the hydraulic pump 9 to a hydraulic cylinder 5 and a front piston rod 6.
is pushed out from the cylinder 5, so this movement causes the connecting plate 1
0. It is transmitted to the sliding ring 20 via the connecting rod 9, and the sliding ring 20 also slides to the left in the figure. When the sliding ring 20 slides to the left in this manner, the link 21 rotates the rudder arm 4 clockwise, and the rotational force is transmitted to the rudder shaft 1 via the key 3. In this way, the rudder shaft 1 is rotated to about 70° to port, which is indicated by a solid line in the figure.

(3) When the rudder shaft 1 is held in a fixed position and the directional control valve 10 is switched to the position (■), the oil in the pipe 16 is blocked by the boats A and B of the directional control valve, so the hydraulic cylinder 5 No movement of oil occurs within the rudder, and even if an external force is applied to the rudder axle 1, the rudder axle 1 is held in a fixed position.

(4) When rotating the rudder shaft 1 to starboard, the directional control valve 1
0 is now switched to position I, pressure oil is sent to the boat L side of the hydraulic cylinder 5, and oil from the boat R side is transferred to the tank T.
will be returned to. Then, the piston 18 is pushed to the right in the figure, and the front piston 6 is retracted into the cylinder.
is transmitted to cause the sliding ring 20 to slide to the right in the figure.

In this way, the link 21 in turn pulls the rudder arm 4 to rotate it counterclockwise, and the rotational force is transmitted to the rudder shaft 1 via the key 3. If this operation continues, the rudder shaft 1 is rotated up to a maximum of 70° to starboard as indicated by the dotted line in the figure.

As described in detail above, according to the steering gear of this embodiment, the load applied to the front piston rod 6 is distributed and supported by the connecting rods 9 at both ends of the connecting plate 10, so that the buckling in the hydraulic cylinder 5 and damage to the seals 14.15 is prevented.

In addition, a large steering angle can be achieved with the short-stroke hydraulic cylinder 5, and there is no risk of contact between the piston rod 6 and the rudder handle 3, resulting in a significant reduction in installation space. It will be done.

Particularly in the steering gear of this embodiment, the rear piston rod 6' is provided to equalize the pressure receiving areas before and after the piston, so that the left and right steering speeds can be made equal.

reduction can be achieved.

[Brief explanation of the drawing]

Figures 1 to 4 show a steering gear as an embodiment of the present invention. Figure 1 is a plan view showing its circuit section with hydraulic symbols, Figure 2 is a side view, and Figure 3 is its side view. Fig. 4 is a vertical cross-sectional view of a hydraulic cylinder, and Fig. 4 is a view taken from the ■■ arrow in Fig. 3. Figs. 5 and 6 show a conventional steering gear, and Fig. 5 shows its circuit section with hydraulic symbols. The plan view shown in FIG. 6 is a side view thereof. 1... Rudder shaft, 2... Rudder handle, 3... Key, 4...
Rudder arm, 5... Hydraulic cylinder, 6... Front piston rod, 6'... Rear piston rod, 7... Bearing, 8... Bin, 9... Connecting rod, 10. ...Directional switching valve, 11...Mounting bolt, 12...Mounting stand, 13.
...Mounting bolt, 14.15...Rod seal, 16
... Piping, 18 ... Piston, 19 ... Piston seal, 20 ... Sliding ring, 21 ... Link. Agent: Yoshihiko Iinuma, Patent Attorney Although the present invention has been described in detail based on one embodiment, the present invention is not limited only to the above-mentioned embodiment, and the scope of the matters described in the claims. For example, the number of connecting rods is not limited to two but may be three or more, and the fixation of the hydraulic cylinder to the hull is limited to only one end of the cylinder. Alternatively, both ends may be fixed. Furthermore, the number of hydraulic cylinders is not necessarily limited to one, and small-diameter hydraulic cylinders with low output may be provided symmetrically across the rudder shaft. [Effects of the Invention] As detailed above, the steering gear of the present invention provides the following effects and advantages. (1) Since the load applied to the piston rod can be distributed to the connecting rod, buckling of the cylinder and damage to the seal can be prevented. (2) Since a large steering angle can be obtained with respect to the cylinder stroke, the cylinder length can be shortened.

Claims (1)

[Claims] A hydraulic cylinder fixed to the hull, a connecting plate whose central part is attached to the tip of the piston rod of the hydraulic cylinder,
a sliding ring that fits on the outer periphery of the hydraulic cylinder and can slide in the axial direction of the hydraulic cylinder; and a plurality of sliding rings that extend parallel to the piston rod from the sliding ring and have each tip attached to the connecting plate. A steering gear, characterized in that a link is provided, one end of which is pivotally connected to the sliding ring, and the other end of which is pivotally connected to the rudder handle.