JP3085334U - Outboard motor steering system - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a steering system suitable for a small outboard motor with low horsepower, such as an outboard motor used for a box-type work boat for laver cultivation work. SOLUTION: An operation cylinder 20 connected to a rotary operation lever 10 and a steering cylinder connected to an outboard motor 50 are provided.
A steering system composed of 60 and hydraulic hoses 71 and 72 connecting both cylinders. The inner volumes of the operating cylinder 20 and the steering cylinder 60 are substantially the same. The difference between the inner diameter of the cylinder tube and the outer diameter of the piston rod is configured to be larger in the case of the operating cylinder than in the case of the steering cylinder. Since the steering system of the present invention is intended for a small outboard motor, the emphasis is placed on saving space on the operating side rather than on reducing the operating force required to operate the operating lever 10.
From the viewpoint of space saving, it is preferable that the steering cylinder and the operation cylinder are configured as single rod cylinders.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a steering system suitable for a small outboard motor with low horsepower, such as an outboard motor used for a box-type work boat for laver culture.

[0002]

[Problems to be solved by conventional techniques and devices]

 As a steering system for controlling the traveling direction of a hull by changing the direction of an outboard motor attached to a hull, a mechanical system and a hydraulic system described below have been conventionally known.

(1) Mechanical type (push-pull cable type) This is to change the direction of the outboard motor by operating a wire cable connected to the outboard motor with a lever. The mechanical steering system has a problem that it can be easily operated using a lever, but it is easily rusted when it is left on land and cannot be moved smoothly.

(2) Hydraulic type (hydraulic system in which a normal hydraulic steering system is diverted as it is) This is a hydraulic steering system in which a steering cylinder connected to an outboard motor and a steering helm pump are connected by a hydraulic cable. Is operated to change the direction of the outboard motor. The hydraulic system has the advantage of reducing the operating load and improving the durability compared to the mechanical system, but on the other hand, the operating handle must be rotated many times, and it is gripped even on the deck surface. Problems such as poor operability due to lowered hands remain.

The present invention provides a steering system suitable for a small outboard motor with low horsepower, such as an outboard motor used for a box-type work boat for laver cultivation work, on the premise of the above conventional technology. is there.

[0006]

[Means, actions and effects to solve the problem]

 The steering system of the present invention is composed of a “operation cylinder in which a piston rod is connected to a rotary operation lever”, a “steering cylinder in which a piston rod is connected to an outboard motor”, and a “hydraulic connecting both cylinders”. Hose ". The inner volumes of the two cylinders are substantially the same, and the difference between the cylinder tube inner diameter and the piston rod outer diameter is larger in the case of the operating cylinder than in the case of the steering cylinder. are doing.

[0007] In the steering system of the present invention having the above configuration, the stroke of the cylinder is shorter on the operation side than on the steering side, which is advantageous in that the operation side saves space. In order to achieve further space saving, it is preferable to employ a single rod cylinder as the steering cylinder and the operation cylinder.

[0008]

[Embodiment of the invention]

 Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a schematic diagram illustrating an entire steering system according to an embodiment of the present invention. 2 and 3 show the operation side cylinder 20 and the steering side cylinder 60 in FIG. 1, respectively.

The operation lever 10 for the operation cylinder 20 (FIG. 2) is fixed at any position on the hull, and can be rotated around a rotation shaft 11. The operation lever 10 is connected to a piston rod 22 of an operation cylinder 20 at a joint portion 10a.

The piston 23 fixed to the piston rod 22 divides the inside of the cylinder tube 21 into two left and right cylinder chambers 20a and 20b. Hydraulic hoses 71, 72 (see FIG. 1) are connected to the cylinder chambers 20a, 20b via cheese joints (not shown) connected to the ports 25a, 25b.

When the operation lever 10 is operated, the operation cylinder 20 rotates about a rotation shaft 28. In the illustrated example, the operation cylinder 20 is swingably supported by the rotation shaft 28 disposed at the right end of the cylinder, but the position of the support point itself can be appropriately set. For example, a configuration called a center trunnion that supports the cylinder near its center may be employed.

Steering cylinder 60 (FIG. 3) A steering bracket 51 protrudes from the outboard motor 50. The steering bracket 51 is connected to a piston rod 62 of the steering cylinder 60 at a joint section 52. ing. As with the operation cylinder 20, the internal structure of the steering cylinder 60 is such that the interior of the cylinder tube 61 is divided into two cylinder chambers 60a and 60b by a piston 63 fixed to a piston rod 62 (FIG. 1). reference). Each cylinder chamber is connected to hydraulic hoses 71, 72 (see FIG. 1) via cheese joints 61a, 61b.

The steering cylinder 60 is rotatably fixed to the hull via a fixture 70, and rotates around the fixture 70 as the piston rod 62 slides. In addition, the outboard motor 50 also rotates around the rotation shaft 50a, thereby controlling the traveling direction of the boat.

Description of the whole system (FIG. 1) Next, the operation of the whole system will be described with reference to FIG. The hydraulic hose 71 connects the cylinder chamber 20a of the operating cylinder 20 and the cylinder chamber 60a of the steering cylinder 60, and the hydraulic hose 72 connects the cylinder chamber 20b of the operating cylinder 20 and the cylinder chamber 60b of the steering cylinder 60. And are connected. Hydraulic hose and cylinder chamber are filled with hydraulic oil.

When the operating lever 10 is operated in the direction of arrow A, the piston 23 slides rightward in FIG. 1, and the hydraulic oil in the cylinder chamber 20b passes through the hydraulic hose 72, and the cylinder chamber 60b of the steering cylinder 60 is moved. Move in. As a result, the piston 63 moves to the left, and the outboard motor 50 turns around the turning axis in the direction of arrow A. At this time, the hydraulic oil in the cylinder chamber 60a moves through the hydraulic hose 71 into the cylinder chamber 20a of the operating cylinder 20.

When the operating lever 10 is operated in the direction of arrow B, the outboard motor 50 also rotates in the direction of arrow B according to the reverse principle.

The features of the present invention are as described above. The present invention provides a steering system for a small boat equipped with a small outboard motor, from the viewpoint of space saving and operability. The following innovations have been implemented.

That is, in the operation cylinder 20 and the steering cylinder 60, the stroke of the operation cylinder 20 is substantially the same as that of the operation cylinder 20 while the cylinder internal volume (volume of hydraulic oil accommodated in the cylinder) is substantially the same. It is set to be shorter (see FIG. 1).

The reason why the cylinder internal volumes are made substantially the same is to make the stroke ends uniform. In other words, this is to make a one-to-one correspondence between the movable angle range of the operation lever 10 centered on the neutral position and the entire attitude range of the outboard motor 50 centered on the neutral position (straight forward position).

The difference in stroke between the two cylinders 20 and 60 having the same internal volume means that the difference between the cylinder tube inner diameter and the cylinder rod outer diameter is different. That is, the cross-sectional area of the donut-shaped space appearing between the cylinder tubes 21 and 61 and the cylinder rods 22 and 62 is set to be larger in the case of the operation cylinder 20 than in the case of the steering cylinder 60. ing.

Since the pressures generated in both cylinders are the same, generally speaking, on the operation cylinder side, a smaller donut-shaped area requires less force for lever operation on the operation cylinder side. However, on the other hand, the stroke becomes large, which is disadvantageous in terms of space saving.

However, since the present invention is intended for a small outboard motor having a small weight, the force required for operating the lever is relatively small. For this reason, emphasis is placed on saving space rather than on reducing the force required for lever operation, and the purpose is to increase the donut-shaped area on the operation cylinder 20 side.

As the dimensional settings for making the donut-shaped area different between the two cylinders 20 and 60, the following size settings can be exemplified. That is, in both cylinders, the outer diameter of the piston rod is set to 15 mm, and the inner diameter of the cylinder tube is set to 32 mm for the working cylinder and 28 mm for the steering cylinder.

Such dimension setting is only an example. For example, the inner diameter of the cylinder tube may be the same in both cylinders, and the outer diameter of the piston rod may be different. Further, both the inner diameter of the cylinder tube and the outer diameter of the piston rod can be set differently in both cylinders.

Also, in the steering system of the present invention, since a circular handle is not used on the operation side, it is easy to confirm that the outboard motor is at the center position (straight forward position). This is because the lever is always in the neutral position when the outboard motor is in the center position.

In the illustrated embodiment, a double rod type in which a piston rod projects on both left and right sides of a piston is used as an operating cylinder and a steering cylinder. However, in the present invention, it is also possible to adopt a single rod type in which the piston rod protrudes from the cylinder to only one side. In this case, in FIGS. 2 and 3, there is no cylinder rod portion protruding toward the side opposite to the operation lever 10 and the outboard motor 50, which is advantageous in terms of space saving.

[Brief description of the drawings]

FIG. 1 is a schematic view showing the entire steering system of the present invention.

FIG. 2 is a schematic partial sectional view illustrating an operation side cylinder in the system of FIG. 1;

FIG. 3 is a schematic partial cross-sectional view illustrating a steering cylinder in the system of FIG. 1;

[Description of Signs] 10 Operating lever 10a Joint section 11 Rotating shaft 20 Operating cylinder 20a, 20b Cylinder 21 Cylinder tube 22 Piston rod 23 Piston 25a, 25b Port 28 Rotating shaft 50 Outboard motor 50a Rotating shaft 51 Steering Fitting 52 Joint 60 Steering cylinder 60a, 60b Cylinder chamber 61 Cylinder tube 61a, 61b Cheese joint 62 Piston rod 63 Piston 70 Fixture 71, 72 Hydraulic hose

Claims (2)

[Utility model registration claims] An operating cylinder (20) having a piston rod (22) connected to a rotary operation lever (10), and a steering rod having a piston rod (62) connected to an outboard motor (50). A steering system comprising a cylinder (60) and hydraulic hoses (71, 72) connecting both cylinders, wherein the inner volumes of both cylinders are substantially the same, and the cylinder tube inner diameter and piston rod A steering system, wherein a difference between the outer diameter and the outer diameter is larger in the case of the operation cylinder than in the case of the steering cylinder. 2. The steering system according to claim 1, wherein the steering cylinder and the operating cylinder are each constituted by a single rod cylinder.