JP2004249790A - Steering device of outboard motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a steering device of an outboard motor for improving a steering feeling of the outboard motor by driving a swivel shaft being a steering shaft of the outboard motor by an actuator, and restricting no space around the outboard motor by preventing the steering actuator from projecting from its circumference line regardless of a steering angle of the outboard motor. <P>SOLUTION: This steering device is constituted so that the swivel shaft 50 being the steering shaft of the outboard motor 10 is rotated by a steering hydraulic cylinder 40; a recessed part 54 presenting a recessed shape in a cross-sectional view is formed in a swivel case 12 for housing the swivel shaft 50; the steering hydraulic cylinder 40 is arranged in an inside space of the recessed part 54; and the steering hydraulic cylinder 40 is positioned in the circumference line 70 regardless of the steering angle of the outboard motor 10. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a steering device for an outboard motor.
[0002]
[Prior art]
Conventionally, a power source of a steering device of an outboard motor is, for example, a tiller handle type for manually steering a tiller handle attached to the outboard motor, a remote control type for remotely controlling a steering mechanism via a push-pull cable, and the like. Most of them were human.
[0003]
However, the above-mentioned manual operation has a problem that the steering feeling is poor due to a heavy steering load. Therefore, as described in, for example, Patent Document 1, it has been proposed to attach a hydraulic cylinder for steering to the hull as a configuration separate from the outboard motor and to power-assist the steering of the tiller handle via a link mechanism. However, the steering system using a retrofitted hydraulic cylinder has the disadvantage that the configuration is complicated, the number of parts and weight are increased, and a space for mounting the hydraulic cylinder on the hull is required. Was.
[0004]
As a technique for solving such a problem, for example, Patent Document 2 can be cited. In the technology described in Patent Document 2, by configuring the hydraulic cylinder for steering to be directly attached to the outboard motor, the number of parts and the weight are prevented from increasing, and the hydraulic cylinder is attached to the hull. Is unnecessary.
[0005]
[Patent Document 1]
JP-A-62-125996 (FIG. 2 etc.)
[Patent Document 2]
JP-A-2-279495 (FIG. 6, etc.)
[0006]
[Problems to be solved by the invention]
However, in the technology described in Patent Document 2 described above, the hydraulic cylinder projects horizontally from the outboard motor depending on the expansion and contraction state of the hydraulic cylinder (that is, the steering angle of the outboard motor). When two outboard motors are installed in parallel (so-called two boats), the space around the outboard motors is limited due to the need to install the outboard motors in consideration of the amount of protrusion. There was a problem that it occurred.
[0007]
Therefore, an object of the present invention is to solve the above-described problems, improve the steering feeling of the outboard motor by driving the swivel shaft, which is the steering shaft of the outboard motor, with the actuator, and use the outboard motor with the steering actuator. It is an object of the present invention to provide a steering apparatus for an outboard motor, which does not protrude from the outer shape line regardless of the steering angle of the outboard motor and does not restrict the space around the outboard motor.
[0008]
[Means for Solving the Problems]
In order to solve the above object, the present invention provides a steering device for an outboard motor which is attached to a hull via a swivel shaft rotatably housed in a swivel case according to claim 1, Along with an actuator for rotating the swivel shaft, a concave portion having a concave shape in a cross-sectional view is formed in the swivel case, and the actuator is disposed in an internal space of the concave portion, regardless of a turning angle of the outboard motor. The outboard motor is configured to be positioned within the outline.
[0009]
As described above, since the swivel shaft, which is the steering shaft of the outboard motor, is configured to be rotated by the actuator, the steering load can be reduced as compared with a case where the swivel shaft is manually rotated, Therefore, the steering feeling of the outboard motor can be improved. Further, a concave portion having a concave shape in a sectional view is formed in a swivel case accommodating the swivel shaft, and the actuator is disposed in the internal space of the concave portion, so that the actuator has its outer shape regardless of the turning angle of the outboard motor. With such a configuration, the actuator does not always protrude from the outboard motor, so that the space around the outboard motor can be prevented from being restricted. Furthermore, since the cross section of the concave portion has a concave shape (U-shape), the strength of the swivel case can be improved.
[0010]
Further, according to claim 2, the recess has a substantially rectangular shape in a top view, and the actuator is arranged in the internal space of the recess so that a longitudinal direction thereof is located on a diagonal line of the substantially rectangle. did.
[0011]
As described above, since the actuator is arranged so that its longitudinal direction is located on the diagonal of the concave portion having a substantially rectangular shape in a top view, in addition to the above-described effects, the outer shape is made larger by effectively utilizing the internal space of the concave portion. An actuator (in other words, an actuator having a larger output) can be arranged. In addition, when a hydraulic cylinder is used as the actuator, the stroke amount of the piston rod can be increased, so that the swivel shaft is secured at a turning angle and the distance between the rotation center of the swivel shaft and the rod head of the piston rod is increased. The distance can be increased, and the driving force (output of the actuator) required to rotate the swivel shaft can be reduced.
[0012]
Further, according to claim 3, further comprising a support portion for supporting the actuator in the internal space of the concave portion, wherein the support portion is a first member for supporting an upper portion of the actuator, and a lower portion of the actuator. And a second member that supports.
[0013]
As described above, since the supporting portion that supports the actuator in the internal space of the concave portion includes the first member that supports the upper portion of the actuator and the second member that supports the lower portion, in addition to the effects described above, It is possible to prevent rattling of the actuator and bending of the support portion, and it is possible to further improve the steering feeling of the outboard motor.
[0014]
According to a fourth aspect of the present invention, there is provided a rotation angle sensor for detecting a rotation angle of the swivel shaft, and the rotation angle sensor is arranged in an internal space of the recess.
[0015]
As described above, since the rotation angle sensor that detects the rotation angle of the swivel shaft is arranged in the internal space of the concave portion, in addition to the above-described effects, the actuator and the actuator can be more effectively utilized by using the internal space of the concave portion. The rotation angle sensor can be arranged compactly.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
An outboard motor steering apparatus according to one embodiment of the present invention will be described below with reference to the accompanying drawings.
[0017]
FIG. 1 is an explanatory view showing the entire steering apparatus for an outboard motor, and FIG. 2 is a partial explanatory side view of FIG.
[0018]
1 and 2, reference numeral 10 denotes an outboard motor in which an internal combustion engine, a propeller shaft, a propeller, and the like are integrated. As shown in FIG. 2, the outboard motor 10 has a swivel case 12 in which a swivel shaft (described later) is rotatably housed, and a stern bracket 14 to which the swivel case 12 is connected. Is mounted so as to be steerable around a gravity axis and a horizontal axis.
[0019]
The outboard motor 10 includes an internal combustion engine (hereinafter, referred to as “engine”) 18 at an upper portion thereof. The engine 18 is a spark-ignition in-line four-cylinder four-stroke gasoline engine with a displacement of 2200 cc. The engine 18 is located on the surface of the water, covered with an engine cover 20 and disposed inside the outboard motor 10. An electronic control unit (hereinafter, referred to as “ECU”) 22 including a microcomputer is arranged near the engine 18 covered with the engine cover 20.
[0020]
Further, the outboard motor 10 includes a propeller 24 at a lower portion thereof and a rudder 26 provided near the propeller 24. The power of the engine 18 is transmitted to the propeller 24 via a crankshaft, a drive shaft, a gear mechanism, and a shift mechanism (not shown) to move the hull 16 forward or backward.
[0021]
As shown in FIG. 1, a steering wheel 28 is arranged near the cockpit of the hull 16. A steering angle sensor 30 is arranged near the steering wheel 28. The steering angle sensor 30 is specifically composed of a rotary encoder, and outputs a signal corresponding to a steering (operation) angle of the steering wheel 28 input by the driver. A throttle lever 32 and a shift lever 34 are disposed on the right side of the cockpit, and their operations are transmitted to a throttle valve and a shift mechanism (both not shown) of the engine 18 via a push-pull cable (not shown).
[0022]
Further, a power tilt switch 36 for adjusting the tilt angle of the outboard motor 10 and a power trim switch 38 for adjusting the trim angle are disposed near the cockpit, and the tilt input by the pilot is increased. -Outputs signals according to the instruction for down and trim up / down. The outputs of the steering angle sensor 30, the power tilt switch 36, and the power trim switch 38 are sent to the ECU 22 via signal lines 30L, 36L, 38L.
[0023]
As shown in FIG. 2, in the vicinity of the swivel case 12 and the stern bracket 14, a steering actuator, specifically, a hydraulic cylinder 40 (hereinafter referred to as “steering hydraulic cylinder”), a tilt angle and A known power tilt trim unit 42 for trim angle adjustment is arranged and connected to the ECU 22 via signal lines 40L and 42L, respectively. A rotation angle sensor 44 is disposed near the steering hydraulic cylinder 40, and outputs a signal corresponding to the rotation angle of a swivel shaft (described later) housed inside the swivel case 12. The output of the rotation angle sensor 44 is sent to the ECU 22 via a signal line 44L.
[0024]
The ECU 22 drives the steering hydraulic cylinder 40 to steer the outboard motor 10 based on the outputs of the above-described sensors and switches, and operates the power tilt trim unit 42 to control the tilt angle and the tilt angle of the outboard motor 10. Adjust the trim angle.
[0025]
FIG. 3 is an enlarged partial sectional view of the vicinity of the swivel case 12 shown in FIG.
[0026]
As shown in FIG. 3, the power tilt trim unit 42 includes one tilt angle adjusting hydraulic cylinder (hereinafter referred to as “tilt hydraulic cylinder”) 42a and two (only one in FIG. 3) trim angles. An adjusting hydraulic cylinder (hereinafter referred to as "trim hydraulic cylinder") 42b is integrally provided.
[0027]
The hydraulic cylinder for tilt 42 a has its cylinder bottom fixed to the stern bracket 14 and attached to the hull 16, and the rod head of the piston rod is brought into contact with the swivel case 12. The hydraulic cylinder 42b for trim also has the cylinder bottom fixed to the stern bracket 14 and attached to the hull 16, and the rod head of the piston rod is brought into contact with the swivel case 12.
[0028]
The swivel case 12 is connected to the stern bracket 14 via the tilting shaft 46 such that the swivel case 12 can be displaced relative to the tilting shaft 46 as a center. In the swivel case 12, a swivel shaft 50 is rotatably housed. The swivel shaft 50 has an axial direction in the direction of gravity, and has an upper end fixed to the mount frame 52 and a lower end fixed to a lower mount center housing (not shown). The mount frame 52 and the lower mount center housing are fixed to a frame on which the engine 18, the propeller 24 and the like are arranged, respectively.
[0029]
FIG. 4 is a plan view of the vicinity of the swivel case 12 as viewed from above. FIG. 5 is a sectional view taken along line VV of FIG.
[0030]
As shown in FIGS. 3 to 5, a concave portion 54 having a concave shape (U-shape in cross section) is formed in the upper part of the swivel case 12, and the steering hydraulic cylinder 40 is disposed in the internal space thereof. Is done. Specifically, as shown in FIG. 4, the concave portion 54 has a substantially rectangular shape in a top view, and the longitudinal direction (axial direction of the cylinder) of the steering hydraulic cylinder 40 is on a diagonal line of the substantially rectangular shape of the concave portion 54. It is arranged to be located. The steering hydraulic cylinder 40 is composed of a return cylinder, and is connected to a hydraulic pump (not shown) via two oil passages 58a and 58b to supply hydraulic pressure. In FIG. 5, the illustration of the steering hydraulic cylinder 40 and the like is omitted in consideration of the legibility of the drawing, and only the cross-sectional shape of the recess 54 is shown.
[0031]
The mounting structure of the steering hydraulic cylinder 40 will be specifically described. A stay 60 is provided in the mount frame 52 just above the swivel shaft 50. The output portion of the steering hydraulic cylinder 40, specifically, a rod head 40a of a piston rod is rotatably attached to the stay 60 (hereinafter, this stay 60 is referred to as an "output portion side stay"). The output section stay 60 is, specifically, a first member 60a that supports an upper portion of the rod head 40a (more specifically, an upper portion of the output section cylindrical member 62 that is rotatably attached to the rod head 40a). (Hereinafter, referred to as a “first output section stay”) and a second member 60b (hereinafter, referred to as “second section”) supporting a lower portion of the rod head 40a (more specifically, a lower portion of the output section cylindrical member 62). Of the swivel shaft 50, and supports the rod head 40a at a position separated by a predetermined distance from the rotation center of the swivel shaft 50.
[0032]
Further, a stay 64 is provided near the end of the swivel case 12 on the hull 16 side. The main body side of the steering hydraulic cylinder 40, specifically, a cylinder bottom 40b is rotatably attached to the stay 64 (hereinafter, the stay 64 is referred to as a "main body side stay"). Specifically, the main body side stay 64 is provided with a first member 64a (hereinafter, referred to as an upper portion of a main body side cylindrical member 66 rotatably attached to the cylinder bottom 40b) that supports an upper portion of the cylinder bottom 40b. , A "first body-side stay") and a second member 64b (hereinafter, referred to as a "second body-side stay") supporting a lower portion of the cylinder bottom 40b (more specifically, a lower portion of the body-side cylindrical member 66). ").
[0033]
In this manner, the steering hydraulic cylinder 40 has its rod head 40a supported by the output section side stay 60 and attached to the mount frame 52 (a part that causes a horizontal angular displacement with respect to the hull 16) and the cylinder bottom. 40b is supported by the main body side stay 64 and attached to the swivel case 12 (a portion that does not cause horizontal angular displacement with respect to the hull 16), and is disposed in the internal space of the concave portion 54.
[0034]
In addition, as shown in FIG. 4, the above-described rotation angle sensor 44 is disposed near an angle different from the angle forming the diagonal line in the internal space of the concave portion 34.
[0035]
The rotation angle sensor 44 is connected via the sensor rod 70 to the first output section stay 60a. That is, the rotation angle of the swivel shaft 50 is transmitted to the rotation angle sensor 44 via the mount frame 52, the first output portion side stay 60a, and the sensor rod 70, and is detected by the rotation angle sensor 44. Accordingly, even when the rotation angle sensor 44 is disposed at a position separated from the swivel shaft 50 in order to effectively use the internal space of the concave portion 54, the rotation angle of the swivel shaft 50 can be detected. .
[0036]
Next, steering of the outboard motor 10 will be outlined based on the above. When the driver steers the steering wheel 28, the steering angle is input to the ECU 22 via the steering angle sensor 30. The ECU 22 drives the hydraulic pump to drive the steering hydraulic cylinder 40 so that the deviation between the input steering angle and the rotation angle of the swivel shaft 50 detected by the rotation angle sensor 44 becomes zero (expansion / contraction). Then, the swivel shaft 50 is rotated to steer the outboard motor 10.
[0037]
By driving the steering hydraulic cylinder 40 in this manner, the horizontal steering of the outboard motor 10 is assisted with the swivel shaft 50 as the steering axis, and thus the propeller 24 and the rudder 26 swing. The hull 16 is steered. Specifically, as the steering hydraulic cylinder 40 is driven in the extending direction, the swivel shaft 50 and the mount frame 52 rotate clockwise (clockwise in top view) with respect to the hull 16 as shown in FIG. As a result, the outboard motor 10 is steered clockwise, so that the hull 16 is steered (turned counterclockwise) counterclockwise (top view).
[0038]
On the other hand, when the steering hydraulic cylinder 40 is driven in the contracting direction, the swivel shaft 50 and the mount frame 52 rotate counterclockwise with respect to the hull 16 as shown in FIG. The hull 16 is steered clockwise (turning clockwise).
[0039]
4, 6, and 7, reference numeral 80 indicates an outer shape line (vertical projection plane) of the outboard motor 10 as viewed from above. 6 is a plan view of the vicinity of the swivel case 12 when the outboard motor 10 is turned clockwise to the maximum steering angle, and FIG. 7 is a plan view of the outboard motor. FIG. 3 is a plan view of the vicinity of the swivel case 12 when the device 10 is rotated counterclockwise to a maximum steering angle, as viewed from above.
[0040]
As shown in FIGS. 6 and 7, in the outboard motor 10 according to the present embodiment, the maximum clockwise turning angle and the maximum counterclockwise turning angle are each 30 degrees, and a total of 60 degrees. Degree steering is possible. However, in this embodiment, since the steering hydraulic cylinder 40 is disposed in the recess 54 formed in the upper part of the swivel case 12, even if the outboard motor 10 is steered left and right to the maximum steering angle. In addition, the steering hydraulic cylinder 40 does not protrude from the inside of the outer shape line 80 of the outboard motor 10 in the horizontal direction. That is, the space around the outboard motor 10 is not restricted. In FIGS. 6 and 7, the illustration of a part of the configuration is simplified so that the movement of the steering hydraulic cylinder 40 is better shown.
[0041]
As described above, in the steering apparatus for an outboard motor according to the present embodiment, the swivel shaft 50 that is the steered shaft of the outboard motor 10 is configured to rotate by the hydraulic cylinder 40 for steering. Thus, the steering load can be reduced as compared with the case where the swivel shaft 50 is manually rotated, and thus the steering feeling of the outboard motor 10 can be improved. Further, the swivel case 12 that accommodates the swivel shaft 50 is formed with a concave portion 54 having a concave shape in a cross-sectional view, and the steering hydraulic cylinder 40 is disposed in the internal space of the concave portion 54 so that the steering hydraulic cylinder 40 is outboard. The steering hydraulic cylinder 40 does not always protrude from the outboard motor 10 because it is configured to be positioned within the outline 80 regardless of the turning angle of the outboard motor 10, and therefore, the space around the outboard motor 10. Can be prevented from being restricted. Furthermore, since the cross section of the concave portion 54 is concave (U-shaped), the strength of the swivel case 12 can be improved.
[0042]
Further, since the steering hydraulic cylinder 40 is disposed so that its longitudinal direction is located on a diagonal line of the concave portion 54 having a substantially rectangular shape in a top view, the hydraulic cylinder having a larger outer shape is effectively used by effectively using the internal space of the concave portion 54. (In other words, a hydraulic cylinder with a larger output) can be arranged. In addition, since the stroke amount of the piston rod of the steering hydraulic cylinder 40 can be increased, the separation distance (from the swivel shaft 50 to the rod head 40a) while securing the rotation angle of the swivel shaft 50 (total 60 degrees). (Corresponding to the rotation radius of the swivel shaft) can be increased, so that the driving force can be increased. In other words, the driving force required to rotate the swivel shaft 50 can be reduced. It is for this purpose that the output side stay 60 is interposed between the rod head 40a and the swivel shaft 50 instead of directly connecting them.
[0043]
Further, since the rotation angle sensor 44 is arranged near the corner different from the corner forming the diagonal line in the interior space of the recess 54, the steering hydraulic pressure is more effectively used by utilizing the interior space of the recess 54. The cylinder 40 and the rotation angle sensor 44 can be arranged compactly.
[0044]
Further, an output-side stay 60 for supporting the steering hydraulic cylinder 40 in the internal space of the recess 54 is provided with a first output-side stay 60a for supporting an upper portion of the rod head 40a and a second output portion for supporting a lower portion thereof. The main stay 64 is composed of a first main stay 64a that supports the upper portion of the cylinder bottom 40b and a second main stay 64b that supports the lower portion. Therefore, the rattling of the steering hydraulic cylinder 40 can be prevented, and the bending of the output section stay 60 and the main body side stay 64 can be prevented, so that the steering feeling of the outboard motor 10 can be further improved. Can be.
[0045]
As described above, in one embodiment of the present invention, the steering of the outboard motor 10 rotatably attached to the hull 16 via the swivel shaft 50 rotatably accommodated in the swivel case 12. In the apparatus, an actuator (steering hydraulic cylinder 40) for rotating the swivel shaft 50 is provided, and a concave portion 54 having a concave shape in a cross-sectional view is formed in the swivel case 12, and the actuator is provided in an internal space of the concave portion 54. The outboard motor 10 is disposed so as to be positioned within the outline 80 of the outboard motor regardless of the turning angle of the outboard motor 10.
[0046]
The recess 54 has a substantially rectangular shape in a top view, and the actuator is disposed in the internal space of the recess 54 such that its longitudinal direction (axial direction of the cylinder) is located on a diagonal line of the substantially rectangle. .
[0047]
Further, a support portion (an output portion side stay 60 and a body side stay 64) for supporting the actuator in the internal space of the concave portion 54 is provided, and the support portion is connected to an upper portion of the actuator (an upper portion of the rod head 40a and a cylinder bottom portion). The first member (the first output portion side stay 60a and the first main body side stay 64a) that supports the upper portion of the actuator 40b and the lower portion of the actuator (the lower portion of the rod head 40a and the lower portion of the cylinder bottom 40b) are supported. And a second member (a second output unit side stay 60b and a second main body side stay 64b).
[0048]
Further, a rotation angle sensor 44 for detecting the rotation angle of the swivel shaft 50 is provided, and the rotation angle sensor 44 is arranged in the internal space of the recess 54.
[0049]
In the above description, a hydraulic cylinder has been described as an example of an actuator for rotating the swivel shaft 50. However, the actuator is not limited to this, and may be an electric motor or a hydraulic motor.
[0050]
【The invention's effect】
According to the first aspect, the swivel shaft, which is the steered shaft of the outboard motor, is configured to be rotated by the actuator, so that the steering load is reduced as compared with a case where the swivel shaft is manually rotated. Therefore, the steering feeling of the outboard motor can be improved. Further, a concave portion having a concave shape in a sectional view is formed in a swivel case accommodating the swivel shaft, and the actuator is disposed in the internal space of the concave portion, so that the actuator has its outer shape regardless of the turning angle of the outboard motor. With such a configuration, the actuator does not always protrude from the outboard motor, so that the space around the outboard motor can be prevented from being restricted. Furthermore, since the cross section of the concave portion has a concave shape (U-shape), the strength of the swivel case can be improved.
[0051]
According to the second aspect, the actuator is disposed so that its longitudinal direction is located on a diagonal line of the concave portion having a substantially rectangular shape in a top view, so that in addition to the above-described effects, the internal space of the concave portion is effectively used. Therefore, an actuator having a larger outer shape (in other words, an actuator having a larger output) can be arranged. When a hydraulic cylinder is used as the actuator, the stroke amount of the piston rod can be increased. The distance can be increased, and the driving force (output of the actuator) required to rotate the swivel shaft can be reduced.
[0052]
According to the third aspect of the present invention, the supporting portion for supporting the actuator in the inner space of the concave portion includes the first member for supporting the upper portion of the actuator and the second member for supporting the lower portion. In addition to the effects described above, rattling of the actuator and bending of the support portion can be prevented, and the steering feeling of the outboard motor can be further improved.
[0053]
According to the fourth aspect, the rotation angle sensor for detecting the rotation angle of the swivel shaft is arranged in the internal space of the concave portion. By utilizing this, the actuator and the rotation angle sensor can be arranged compactly.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram generally showing a steering apparatus for an outboard motor according to one embodiment of the present invention.
FIG. 2 is a partial explanatory side view of the steering device shown in FIG.
FIG. 3 is an enlarged partial cross-sectional view showing the vicinity of a swivel case shown in FIG. 2;
FIG. 4 is a plan view of the vicinity of the swivel case shown in FIG. 3 as viewed from above.
FIG. 5 is a sectional view taken along line VV of FIG. 4;
FIG. 6 is a plan view similar to FIG. 4, showing the vicinity of the swivel case when the outboard motor is turned clockwise to a maximum turning angle, as viewed from above.
FIG. 7 is a plan view similar to FIG. 4, showing the vicinity of the swivel case when the outboard motor is turned counterclockwise to the maximum turning angle, similarly viewed from above.
[Explanation of symbols]
10 Outboard motor 12 Swivel case 16 Hull 24 Propeller 40 Steering hydraulic cylinder (actuator)
40a Rod head 40b Cylinder bottom 44 Rotation angle sensor 50 Swivel shaft 52 Mount frame 54 Depression 60 Output section side stay (support section)
60a First output unit side stay (first member)
60b Second output unit side stay (second member)
64 Main body side stay (support)
64a First body side stay (first member)
64b Second body-side stay (second member)
80 Outboard motor outline

Claims (4)

A steering device for an outboard motor rotatably mounted on a hull via a swivel shaft rotatably housed in a swivel case, comprising an actuator for rotating the swivel shaft, and a cross-sectional view of the swivel case. A concave portion having a concave shape is formed, and the actuator is arranged in the internal space of the concave portion so as to be positioned within the outline of the outboard motor regardless of the turning angle of the outboard motor. Outboard motor steering device. 2. The actuator according to claim 1, wherein the recess has a substantially rectangular shape in a top view, and the actuator is arranged in an internal space of the recess so that a longitudinal direction thereof is located on a diagonal line of the substantially rectangle. 3. Outboard motor steering system. A support is provided for supporting the actuator in the internal space of the recess, and the support is composed of a first member that supports an upper portion of the actuator and a second member that supports a lower portion of the actuator. The outboard motor steering system according to claim 1 or 2, wherein: The rotation angle sensor for detecting a rotation angle of the swivel shaft is provided, and the rotation angle sensor is disposed in an internal space of the recess. Outboard motor steering system.

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