JP2011105209A - Steering device for outboard engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a steering device for an outboard engine installable in various hulls by keeping short the total length from a steering wheel to a helm mechanism. <P>SOLUTION: The steering device 16 of the outboard engine steers the outboard engine by operating the helm mechanism 42 by operation of the steering wheel 37. This steering device 16 includes an electric assist mechanism 41 for assisting the operation of the steering wheel based on steering torque acting on the steering wheel. An output shaft 53 of an electric actuator 52 provided in the electric assist mechanism is orthogonally arranged to a steering wheel output shaft 48. A driving shaft 67 of the helm mechanism is also orthogonally arranged to the steering wheel output shaft. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an outboard motor steering apparatus that operates a helm mechanism (steering mechanism) by operating a steering handle provided on a hull, and steers the outboard motor with the operating helm mechanism.

A steering wheel or tiller handle is used as a steering device for steering an outboard motor supported on the rear part of the hull.
In the steering device, an assist mechanism is provided between a steering wheel (hereinafter referred to as a “steering handle”) and a hydraulic helm pump (hydraulic steering pump), and the assist mechanism assists the steering force (operating force) of the steering handle. (For example, refer to Patent Document 1).

According to the steering device of Patent Document 1, when the steering handle is operated, the driving force of the helm mechanism (steering mechanism) is operated with a relatively small steering force by assisting the steering force of the steering handle with the assist mechanism. (That is, the steering force of the steering wheel can be reduced).
By operating the drive shaft of the helm mechanism, oil is discharged from the helm mechanism, and the discharged oil is guided to the steering means. By guiding the oil to the steering means, the outboard motor can be steered by operating the steering means with the oil.

JP-A-2005-231383

However, in the steering device of Patent Document 1, a helm mechanism is coaxially provided in the steering handle and the assist mechanism, and the entire length from the steering handle to the helm mechanism becomes long.
Therefore, in order to install the steering device of Patent Document 1 on the hull, a relatively large installation space is required in the hull. For this reason, the ship body which can install the steering apparatus of patent document 1 was restricted to the thing which can ensure a comparatively big installation space in a ship body.

  It is an object of the present invention to provide an outboard motor steering apparatus that can be installed in various hulls while keeping the total length from the steering handle to the helm mechanism short.

  According to a first aspect of the present invention, in a steering apparatus for an outboard motor that operates a helm mechanism by operating a steering handle provided on a hull, and steers the outboard motor by the operation of the helm mechanism, the helm mechanism acts on the steering handle. An electric assist mechanism that detects steering torque and assists the operation of the steering handle based on the detected steering torque is provided, and the output shaft of the electric actuator provided in the electric assist mechanism is relative to the handle output shaft of the steering handle. And the drive shaft of the helm mechanism is arranged perpendicular to the handle output shaft.

  The invention according to claim 2 is characterized in that the handle output shaft and the drive shaft are coupled by meshing a bevel gear provided on the handle output shaft with a bevel gear provided on the drive shaft.

  The invention according to claim 3 is characterized in that the helm mechanism is a hydraulic helm pump that steers the outboard motor hydraulically or a mechanical helm mechanism that mechanically steers the outboard motor.

  The invention according to claim 4 is characterized in that the electric assist mechanism is controlled based on the detected steering torque and the number of revolutions of an engine that drives a propeller of the outboard motor.

In the invention according to claim 1, the output shaft of the electric actuator provided in the electric assist mechanism is arranged orthogonal to the handle output shaft of the steering handle. In addition, the drive shaft of the helm mechanism (steering mechanism) is arranged orthogonal to the handle shaft.
Therefore, the electric assist mechanism and the helm mechanism can be disposed laterally with respect to the handle output shaft, and the total length from the steering handle to the helm mechanism can be kept short.
As a result, the steering device for the outboard motor can be made compact, and the compacted steering device can be installed in various hulls.

In the invention according to claim 2, the handle shaft and the drive shaft are connected by meshing the bevel gear (bevel gear) provided on the drive shaft with the bevel gear (bevel gear) provided on the handle output shaft.
Therefore, by changing the gear ratio between the bevel gear provided on the handle output shaft and the bevel gear provided on the drive shaft, the turning angle of the steering handle can be suitably adjusted.
Thereby, for example, the turning angle of the steering wheel can be suitably adjusted in accordance with the operability when the hull is departed or berthed.

In the invention according to claim 3, both the hydraulic helm pump (hydraulic steering pump) and the mechanical helm mechanism can be used as the helm mechanism.
As a result, when the outboard motor steering device is attached to the hull, one suitable for the hull can be selected from the hydraulic helm pump and the mechanical helm mechanism, and the degree of design freedom can be increased.

In the invention according to claim 4, the electric assist mechanism is controlled based on the detected steering torque, and the electric assist mechanism is controlled based on the rotational speed of the engine that drives the propeller.
Here, when the number of revolutions of the engine is increased, the hull enters a high-speed sliding state (high-speed sliding area), and the reaction force of the propeller is increased. For this reason, in the high-speed sliding area, the steering force (operation force) of the steering wheel is increased.
On the other hand, if the number of revolutions of the engine is lowered, the hull enters a low speed sliding state (low speed sliding area), and the reaction force of the propeller is reduced. For this reason, the steering force of the steering wheel becomes light in the low speed sliding area.

Therefore, in claim 4, the electric assist mechanism is controlled based on the rotational speed of the engine that drives the propeller.
Therefore, the steering force of the steering handle by the operator can be reduced by controlling so that the steering force (assist force) of the steering handle by the electric assist mechanism is increased in the high-speed sliding area.

On the other hand, in the low-speed sliding area, the steering force of the steering handle by the operator can be properly maintained by controlling the steering force (assist force) of the steering handle by the electric assist mechanism to be small.
In this way, the steering stability of the steering wheel can be improved by reducing the steering force of the steering wheel in the high-speed sliding area and maintaining the steering force of the steering wheel appropriately in the low-speed sliding area.

1 is a plan view showing a hull provided with an outboard motor steering apparatus (Example 1) according to the present invention. It is a perspective view which shows the steering apparatus of FIG. It is sectional drawing which shows the steering apparatus of FIG. FIG. 4 is an enlarged view of part 4 of FIG. 3. FIG. 5 is a sectional view taken along line 5-5 of FIG. It is a perspective view which shows the steering device (Example 2) of the outboard motor which concerns on this invention. It is sectional drawing which shows the steering apparatus of FIG. FIG. 6 is a cross-sectional view showing an outboard motor steering apparatus (Example 3) according to the present invention.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. Note that “front”, “rear”, “left”, and “right” indicate Fr as the front, Rr as the rear, L as the left, and R as the right according to the direction viewed from the operator.

The outboard motor steering apparatus 16 according to the first embodiment will be described.
As shown in FIG. 1, the outboard motor 10 includes an outboard motor main body 13 provided at the stern 12 of the hull 11, a cylinder unit 14 that steers the outboard motor main body 13, and an outboard that operates the cylinder unit 14. A machine steering device (hereinafter referred to as “steering device”) 16.

The outboard motor main body 13 is supported on the stern 12 of the hull 11 through a swivel shaft 21 so as to be swingable (swingable) in the left-right direction.
The outboard motor main body 13 includes an engine 22, and a propeller 23 is connected to the output shaft of the engine 22.

The cylinder unit 14 includes a steering cylinder 25 provided on the stern 12 of the hull 11 and a rod 28 that connects an arm 27 to the steering piston 26 of the steering cylinder 25.
The arm 27 is provided on the outboard motor main body 13.
The steering cylinder 25 has a left end 25a communicating with a left port 77 of a hydraulic helm pump 66 (described later) via a left steering pipe 31, and a right end 25b having a hydraulic helm via a right steering pipe 32. The pump 66 communicates with the right port portion 78 of the pump 66.

When the hydraulic pressure is applied to the left steering pipe 31 from the hydraulic helm pump 66, the steering piston 26 moves to the right as indicated by the arrow A. As a result, the outboard motor body 13 swings leftward as indicated by the arrow B about the swivel shaft 21.
On the other hand, when the hydraulic pressure is applied to the right steering pipe 32 from the hydraulic helm pump 66, the steering piston 26 moves to the left as indicated by the arrow C. As a result, the outboard motor main body 13 swings rightward as indicated by the arrow D about the swivel shaft 21.

  As shown in FIGS. 2 and 3, the steering device 16 includes a holder 35 provided on the instrument panel 15 of the hull 11, a handle shaft unit 36 provided rotatably in the holder 35, and a handle shaft unit 36. A steering wheel (steering handle) 37 provided at the upper part of the motor, an electric assist mechanism 41 and a helm mechanism (steering mechanism) 42 coupled to the lower part of the handle shaft unit 36, and a control unit 43 for controlling the electric assist mechanism 41; It has.

The steering device 16 has a function of operating a helm mechanism 42 by operating a steering wheel 37 provided on the hull 11 and steering the outboard motor main body 13 (see FIG. 1) by the operation of the helm mechanism 42. .
Further, the steering device 16 has a function of increasing the operability of the steering wheel 37 by the electric assist mechanism 41 when the steering wheel 37 is operated.

The handle shaft unit 36 includes a handle shaft 45 connected to the steering wheel 37, a hollow handle input shaft 47 connected to the handle shaft 45 via a joint portion 46, and coaxially below the handle input shaft 47. A handle output shaft 48 is provided.
The handle output shaft 48 is supported coaxially with the handle input shaft 47 so as to be rotatable.
The joint portion 46 is a connecting member that connects the handle shaft 45 to the handle input shaft 47 so that the handle shaft 45 can be inclined in any direction with respect to the handle input shaft 47.

  The electric assist mechanism 41 includes a torque sensor 51 that detects a steering torque transmitted to the handle input shaft 47, an electric actuator 52 that operates based on the detected steering torque, and an output shaft 53 of the electric actuator 52 that serves as a handle output shaft 48. And an assist gear mechanism 54 coupled to the motor.

  As shown in FIG. 4, the torque sensor 51 includes a torsion bar 56 having an upper end portion 56a coupled to the handle input shaft 47 and a lower end portion 56b coupled to the handle output shaft 48, and a torsion bar 56 (specifically, , A general sensor including a torque ring 57 supported on the handle input shaft 47) so as to be movable in the axial direction, and a coil 58 provided outside the torque ring 57.

  When the steering torque is transmitted to the handle input shaft 47, the torque sensor 51 twists the torsion bar 56 and moves the torque ring 57 in the axial direction of the handle input shaft 47 based on the twist of the torsion bar 56. The amount of movement of the torque ring 57 is detected by the coil 58, and the steering torque is detected based on the detected amount of movement.

The detected steering torque is transmitted to the control unit 43 (see FIG. 2).
The control unit 43 outputs a drive signal to the electric actuator 52 based on the transmitted steering torque.
The electric actuator 52 is a normal electric motor that is driven based on a drive signal from the control unit 43 (specifically, the output shaft 53 is rotated).
The output shaft 53 is provided with a pinion 61 (see FIG. 5) of the assist gear mechanism 54.

As shown in FIGS. 3 and 5, the assist gear mechanism 54 includes a pinion 61 provided on the output shaft 53 of the electric actuator 52 and a helical gear (helical gear) provided on the handle output shaft 48 while meshing with the pinion 61. 62).
Here, the output shaft 53 of the electric actuator 52 is disposed orthogonal to the handle shaft unit 36 (handle output shaft 48) connected to the steering wheel 37.
The electric assist mechanism 41 is provided between the steering wheel 37 and the helm mechanism 42.
The reason why the output shaft 53 of the electric actuator 52 is arranged orthogonal to the handle shaft unit 36 (handle output shaft 48) will be described later.

By engaging the pinion 61 with the helical gear 62, the rotation of the pinion 61 can be transmitted to the handle output shaft 48 via the helical gear 62.
The pinion 61 rotates integrally with the output shaft 53 when the electric actuator 52 is operated based on the detected steering torque.
Therefore, rotation of the handle output shaft 48 can be assisted (assisted) by the electric actuator 52 (electric assist mechanism 41).

Thereby, the steering force (steering torque) of the steering wheel 37 can be assisted (assisted) by the electric assist mechanism 41.
Therefore, when the steering wheel 37 is operated, the steering wheel 37 can be operated with a relatively small steering force, and the operability can be improved.

In addition, as will be described later, the electric assist mechanism 41 assists the steering force (steering torque) of the steering wheel 37 based on the rotational speed of the engine 22 shown in FIG. 1 (hereinafter referred to as “engine rotational speed”) ( It has a function to assist.
That is, the electric assist mechanism 41 is configured to be able to suitably control the operation of the steering wheel 37 based on the detected steering torque and the engine speed.

  As shown in FIGS. 2 and 3, the helm mechanism 42 includes a helm gear mechanism (steering gear mechanism) 65 that connects the handle output shaft 48 to a drive shaft 67 of a hydraulic helm pump (hydraulic steering pump) 66, and a helm gear mechanism 65. And a hydraulic helm pump 66 interlocking with the handle output shaft 48.

The helm gear mechanism 65 includes a drive bevel gear (bevel gear) 68 provided on the handle output shaft 48, and a driven bevel gear (bevel gear) 69 provided on the drive shaft 67 while meshing with the drive bevel gear 68.
In other words, the handle output shaft 48 and the drive shaft 67 are connected by meshing the driven bevel gear 69 provided on the drive shaft 67 with the drive bevel gear 68 provided on the handle output shaft 48.

Here, the drive shaft 67 of the helm mechanism 42 is disposed orthogonal to the handle shaft unit 36 (handle output shaft 48).
The helm mechanism 42 is provided below the electric assist mechanism 41.
That is, the distance from the steering wheel 37 to the helm mechanism 42 is the total length L1 of the steering device 16.
The reason why the drive shaft 67 of the helm mechanism 42 is arranged orthogonal to the handle shaft unit 36 (handle output shaft 48) will be described later.

In the hydraulic helm pump 66, the rotating shaft 71 rotates together with the drive shaft 67 by the rotation of the drive shaft 67. As the rotating body 71 rotates, the piston 72 rotates together with the rotating body 71.
The piston 72 rotates while slidingly contacting the swash plate 74 via the bearing 73, so that the piston 72 slides in the axial direction and discharges the oil in the cylinder 75.
That is, the hydraulic helm pump 66 is a commonly used piston pump (plunger pump).

Here, the left steering pipe 31 communicates with the left port section 77 of the hydraulic helm pump 66, and the right steering pipe 32 communicates with the right port section 78 of the hydraulic helm pump 66.
By discharging oil from the hydraulic helm pump 66, hydraulic pressure acts on either the left steering pipe 31 or the right steering pipe 32 of the steering cylinder 25.

Therefore, the steering piston 26 of the steering cylinder 25 shown in FIG. 1 is moved in one of the left direction and the right direction.
As a result, the outboard motor main body 13 swings leftward and rightward about the swivel shaft 21 so that the hull 11 can be steered leftward and rightward.
Thus, by using the hydraulic helm pump 66, the outboard motor main body 13 can be steered hydraulically.

Here, as described above, the handle output shaft 48 and the drive shaft 67 are connected by meshing the drive bevel gear 68 and the driven bevel gear 69.
Therefore, the turning angle of the steering wheel 37 can be suitably adjusted by changing the gear ratio of the drive bevel gear 68 and the driven bevel gear 69.
Thereby, for example, the turning angle of the steering wheel 37 can be suitably adjusted according to the operability when the hull 11 is departed or berthed.

In addition, by configuring the helm gear mechanism 65 with the drive bevel gear 68 and the driven bevel gear 69, the rotation of the handle output shaft 48 can be transmitted to the drive shaft 67 of the helm mechanism 42 with a simple configuration.
As a result, the total length L1 from the steering wheel 37 to the helm mechanism 42 can be kept short, and the helm gear mechanism 65 can be simplified and the cost can be reduced.

As shown in FIGS. 1 and 2, the control unit 43 has a function of transmitting a drive signal to the electric assist mechanism 41 (electric actuator 52) based on the steering torque detected by the torque sensor 51.
Therefore, as described above, the steering force (steering torque) F1 of the steering wheel 37 can be assisted (assisted) by the electric assist mechanism 41 when the steering wheel 37 is steered.
As a result, the steering wheel 37 can be operated with a relatively small steering force F1, and the operability can be improved.

Here, when the rotation speed of the engine 22 is increased, the hull 11 enters a high-speed sliding state (high-speed sliding area), and the reaction force of the propeller propeller 23 increases. For this reason, the steering force F1 of the steering wheel 37 increases in the high-speed sliding area.
On the other hand, when the rotational speed of the engine 22 is lowered, the hull 11 is in a low-speed sliding state (low-speed sliding area), and the reaction force of the propeller propeller 23 is reduced. For this reason, in the low-speed sliding area, the steering force F1 of the steering wheel 37 becomes light.

Therefore, the control unit 43 has a function of transmitting a drive signal to the electric assist mechanism 41 (electric actuator 52) based on the engine speed.
Specifically, the engine speed is detected by the speed detecting means 81 (see FIG. 1), and the detected signal is transmitted to the control unit 43.

When the engine speed is high, a signal that promotes assist by the electric assist mechanism 41 is transmitted from the control unit 43 to the electric actuator 52.
Therefore, the electric assist mechanism 41 can be controlled so that the steering force (assist force) acting on the steering wheel 37 is increased in the high-speed sliding area.
Thereby, the steering force F1 of the steering wheel 37 by the operator can be reduced.

On the other hand, when the engine speed is low, a signal that suppresses assist by the electric assist mechanism 41 is transmitted from the control unit 43 to the electric actuator 52.
Therefore, the electric assist mechanism 41 can be controlled so that the steering force (assist force) acting on the steering wheel 37 is kept small in the low speed sliding area.
Thereby, the steering force F1 of the steering wheel 37 by an operator can be kept appropriate.

  As described above, the steering force F1 of the steering wheel 37 is reduced in the high-speed sliding area, and the steering force F1 of the steering wheel 37 is appropriately maintained in the low-speed sliding area, thereby improving the steering stability of the steering wheel 37 by the operator. be able to.

Here, as shown in FIG. 3, the output shaft 53 of the electric actuator 52 is disposed orthogonal to the handle output shaft 48, and the drive shaft 67 of the helm mechanism 42 is disposed orthogonal to the handle output shaft 48.
Therefore, the electric assist mechanism 41 and the helm mechanism 42 can be disposed laterally with respect to the handle output shaft 48, and the total length L1 from the steering wheel 37 to the helm mechanism 42 can be kept short.
As a result, the steering device 16 can be made compact, and the compacted steering device 16 can be installed in various hulls 11 (see FIG. 1).

Next, Examples 2 to 3 will be described with reference to FIGS.
In addition, in Example 2-3, the same code | symbol is attached | subjected about the same / similar member as the steering apparatus 16 of Example 1, and description is abbreviate | omitted.

An outboard motor steering apparatus 90 according to a second embodiment will be described.
As shown in FIGS. 6 to 7, the steering device 90 is provided with a mechanical helm mechanism (mechanical steering mechanism) 92 instead of the hydraulic helm pump 66 of the first embodiment, and other configurations are the steering device of the first embodiment. It is the same as 16.

In the mechanical helm mechanism 92, a pulley 93 is coaxially provided on the drive shaft 67, and an operation cable 94 is attached to the outer periphery 93 a of the pulley 93.
The operation cable 94 is pulled out from the case 95, and a pair of end portions 94a and 94b are extended to the outboard motor main body 13 (see also FIG. 1).
One end portion 94 a is connected to the right end portion 97 a of the steering rod 97, and the other end portion 94 b is connected to the left end portion 97 b of the steering rod 97.

According to the mechanical helm mechanism 92, the steering wheel 37 is steered in the left direction, whereby the handle output shaft 48 rotates counterclockwise, and the drive shaft 67 is rotated clockwise in the left side view via the helm gear mechanism 65. Rotate to.
The pulley 93 rotates integrally with the drive shaft 67 in the clockwise direction when viewed from the left side, whereby one end 94a of the operation cable 94 is pulled back as indicated by an arrow E.
Accordingly, the steering rod 97 moves to the right, and the outboard motor main body 13 swings to the left about the swivel shaft 21.

On the other hand, by steering the steering wheel 37 in the right direction, the handle output shaft 48 rotates in the clockwise direction, and the drive shaft 67 rotates in the counterclockwise direction as viewed from the left side through the helm gear mechanism 65.
The pulley 93 rotates integrally with the drive shaft 67 in the counterclockwise direction when viewed from the left side, whereby the other end 94b of the operation cable 94 is pulled back as indicated by an arrow F.
Therefore, the steering rod 97 moves leftward, and the outboard motor main body 13 swings rightward about the swivel shaft 21.
That is, the mechanical helm mechanism 92 is a mechanism for mechanically steering the outboard motor main body 13.

Here, in the mechanical helm mechanism 92, like the hydraulic helm pump 66 of the first embodiment, the drive shaft 67 is disposed orthogonal to the handle shaft unit 36 (handle output shaft 48).
Therefore, the electric assist mechanism 41 and the mechanical helm mechanism 92 can be disposed laterally with respect to the handle output shaft 48, and the total length L2 from the steering wheel 37 to the mechanical helm mechanism 92 (ie, the helm mechanism) can be kept short.
As a result, the steering device 90 can be made compact, and the compacted steering device 90 can be installed in various hulls 11 (see FIG. 1).

In addition, by making the mechanical helm mechanism 92 usable in the second embodiment, both the hydraulic helm pump 66 (first embodiment) and the mechanical helm mechanism 92 (second embodiment) can be used as the helm mechanism.
Thereby, it becomes possible to select the thing suitable for the hull 11 from the hydraulic helm pump 66 and the mechanical helm mechanism 92, and the freedom degree of design can be raised.

  Furthermore, according to the steering device 90 according to the second embodiment, the same effects as those of the steering device 16 according to the first embodiment can be obtained.

An outboard motor steering apparatus 100 according to a third embodiment will be described.
As shown in FIG. 8, the steering device 100 is provided with a tiller handle (steering handle) 102 instead of the steering wheel 37 of the second embodiment, and the other configurations are the same as those of the steering device 90 of the second embodiment.

Here, the lower end 45a and the upper end 47a are coaxially connected in a state where the upper end 47a of the handle input shaft 47 is fitted into the lower end 45a of the handle shaft 45.
Therefore, the joint part 46 of Example 1 can be made unnecessary. Thereby, the total length L3 from the tiller handle 102 to the mechanical helm mechanism 92 (that is, the helm mechanism) can be further reduced.
Similarly to the first embodiment, the torsion bar 56 has an upper end portion 56a connected to the handle input shaft 47 (upper end portion 47a) and a lower end portion 56b connected to the handle output shaft 48.

According to the steering device 100, the handle shaft 45 can be selectively rotated clockwise or counterclockwise by grasping the grip 103 of the tiller handle 102 and swinging in the horizontal direction.
As described above, the lower end portion 45 a of the handle shaft 45 is coaxially connected to the upper end portion 47 a of the handle input shaft 47.
As a result, similarly to the second embodiment, the mechanical helm mechanism 92 can be operated to swing the outboard motor main body 13 shown in FIG. 1 in the left-right direction around the swivel shaft 21.

By using the tiller handle 102 for the steering device 100, the steering wheel 37 (Examples 1 and 2) and the tiller handle 102 (Example 3) can be appropriately selected as the steering handle according to the hull 11 (see FIG. 1). it can.
As a result, the steering device can be applied to various types of hulls 11, and the use of the steering device can be expanded.

Further, according to the configuration of the steering device 100, the tiller handle 102 can be divided (separated) from the outboard motor main body 13.
Here, the tiller handle of the outboard motor is usually provided integrally with the outboard motor main body.
For this reason, the attachment position of a tiller handle cannot be chosen arbitrarily.

On the other hand, the steering device 100 according to the third embodiment can be provided with the tiller handle 102 divided (separated) from the outboard motor main body 13.
Therefore, the tiller handle 102 can be attached to any part of the hull 11.
As a result, the usability of the steering device 100 can be increased, and the degree of design freedom can be increased.

  Furthermore, according to the steering device 100 according to the third embodiment, the same effect as that of the steering device 90 according to the second embodiment can be obtained.

The outboard motor steering devices 16, 90, 100 according to the present invention are not limited to the above-described embodiments, and can be changed or improved as appropriate.
For example, in the first embodiment, an example in which a piston pump (plunger pump) is used as the hydraulic helm pump 66 of the helm mechanism 42 has been described. Other pumps can also be used.
For example, a cylinder-type hydraulic pressure generating device has a pinion that rotates integrally with the drive shaft by rotating the drive shaft, and the rack moves in the axial direction of the cylinder by the rotation of the pinion. It moves to the axial direction of 97, and it is comprised so that the oil in a cylinder may protrude by the movement of a piston.

  Further, the outboard motor 10, the hull 11, the steering devices 16, 90, 100, the engine 22, the propeller 23, the steering wheel 37, the electric assist mechanism 41, the helm mechanism 42, and the control unit 43 shown in the first to third embodiments. , Handle shaft 45, handle output shaft 48, electric actuator 52, electric actuator output shaft 53, hydraulic helm pump 66, helm mechanism drive shaft 67, drive bevel gear 68, driven bevel gear 69, mechanical helm mechanism 92, tiller handle 102, etc. These shapes and configurations are not limited to those illustrated, and can be changed as appropriate.

  The present invention is suitable for application to an outboard motor equipped with a steering device that operates a helm mechanism by operating a steering handle provided on the hull and steers the outboard motor with the operating helm mechanism.

  DESCRIPTION OF SYMBOLS 10 ... Outboard motor, 11 ... Hull, 16, 90, 100 ... Steering device (steering device of outboard motor), 22 ... Engine, 23 ... Propeller, 37 ... Steering wheel (steering handle), 41 ... Electric assist mechanism 42 ... Helm mechanism, 43 ... Control unit, 45 ... Handle shaft, 48 ... Handle output shaft, 52 ... Electric actuator, 53 ... Output shaft of electric actuator, 66 ... Hydraulic helm pump, 67 ... Drive shaft of helm mechanism, 68 ... drive bevel gear (bevel gear), 69 ... driven bevel gear (bevel gear), 92 ... mechanical helm mechanism, 102 ... tiller handle (steering handle).

Claims (4)

In an outboard motor steering apparatus for operating a helm mechanism by operating a steering handle provided on the hull, and steering the outboard motor by the operation of the helm mechanism,
An electric assist mechanism for detecting a steering torque acting on the steering handle and assisting the operation of the steering handle based on the detected steering torque;
The output shaft of the electric actuator provided in the electric assist mechanism is arranged orthogonal to the handle output shaft of the steering handle,
An outboard motor steering apparatus, wherein a drive shaft of the helm mechanism is disposed perpendicular to the handle output shaft. The handle output shaft and the drive shaft are
2. The outboard motor steering system according to claim 1, wherein the bevel gear provided on the handle output shaft is connected to the bevel gear provided on the drive shaft by meshing with the bevel gear. The helm mechanism is
2. The outboard motor steering apparatus according to claim 1, wherein the outboard motor is a hydraulic helm pump that steers the outboard motor hydraulically or a mechanical helm mechanism that mechanically steers the outboard motor. The electric assist mechanism is
2. The outboard motor steering apparatus according to claim 1, wherein the outboard motor steering apparatus is controlled based on the detected steering torque and a rotational speed of an engine that drives a propeller of the outboard motor. 3.

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