JPS63219498A - Trimming device for vessel propulsion machinery - Google Patents

Abstract

PURPOSE:To reduce the contact area between a load receiver and a trim rod of a propulsion machinery main body so as to reduce a slip phenomenon and to suppress the generation of stick by forming groove in the direction of the trim rod movement at least at one side of the contact between them. CONSTITUTION:The tip 14a of a trim rod 14 is formed in a spherical surface and contacted to a load receiver of the main body 6 of an outboard motor through a thrush receiver 15. In the thrust receiving part 15a of the receiver 15, a contact 15c to contact with the tip 14a of the rod 14 is formed in a long ellipse in the moving direction of the rod 14 when a tilt made, that is, in the sliding direction of the rod 14, and its surface is made in a convex at a specific curvature, On the contact of the contact 15c of the thrust receiving part 15a, numerous groove 18 are formed parallel in the moving direction of the rod 14 respectively, and thereby, the contact area between the tip 14a and the contact 15c is reduced while the contact 15c is kept contacted successively to the tip 14a of the rod 14. Therefore, a slip phenomenon in the sliding condition can be reduced, and the generation of stick is suppressed to prevent the generation of abnormal sounds.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a trim device for a marine propulsion device that controls the trim angle of the propulsion device.

(Prior Art) Some propulsion devices such as outboard motors and inboard/outboard motors mounted on ships are equipped with a trim device.

This trim device is equipped with a trim cylinder on a support bracket fixed to the hull. Pressure fluid is supplied to this trim cylinder to extend and retract the trim rod, and the propulsion unit rotates around a horizontal axis provided on the support bracket. The trim angle of the propulsion unit is controlled according to the vessel's cruising conditions.

By the way, this trim rod is in contact with the load receiving portion side of the propulsion device main body, and pushes the load receiving portion of the propulsion device main body while receiving the propulsive force of the propeller of the propulsion device. Therefore, while the trim rod moves in a linear motion in the direction of the cylinder axis, the propulsion unit rotates around the horizontal axis of the clamp bracket and moves in a circular motion, so the tip of the trim rod and the load The receiving part side slides against each other, and the slip phenomenon at that time causes sticking, which is one of the causes of abnormal noise.

(Problem to be Solved by the Invention) Therefore, if the tip of the trim rod and the load receiving part side of the propulsion machine body are brought into point contact via, for example, a ball or a thrust receiver, the propulsion machine will be trimmed. By changing the angle, the contact position between the ball and the thrust receiver changes without sliding, and by suppressing relative sliding, the occurrence of stick is reduced. However, this method requires a ball, and has problems such as a complicated structure for attaching it so that the position of contact with the thrust receiver can be changed without sliding, and cost increases.

The present invention has been made in view of the above, and an object of the present invention is to provide a trim device for a marine propulsion device that has a simple structure and can effectively reduce the stick.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention has a main body of a propulsion unit supported rotatably around a substantially horizontal axis by a support bracket fixed to the hull. In the trim device for a marine propulsion device, a trim rod of a trim cylinder provided in a support bracket is brought into contact with and supported by a load receiving portion of a main body, and a trim angle of the propulsion device is controlled by expansion and contraction of the trim rod. The present invention is characterized in that a groove in the trim rod moving direction is formed in at least one of the load receiving portion of the machine body and the contact portion with the trim rod.

(Function) In the present invention, when the trim rod of the trim cylinder is expanded or contracted, the propulsion unit body rotates about the horizontal axis of the support bracket as a fulcrum, and the trim angle is controlled. At this time,
At the contact part between the trim rod and the load receiving part of the propulsion machine body,
A groove is formed in the direction of movement of the trim rod, and this groove maintains continuous contact between the two while sliding, while reducing the contact area between the two, reducing slippage. It is possible to suppress the occurrence of sticks.

(Example) Hereinafter, an example of the present invention will be described in detail based on the accompanying drawings.

In FIG. 7, reference numeral 1 denotes the hull, and a clamp bracket 3 as a support bracket is fixed to the stern plate 2 of the hull.
A swivel bracket 4 is rotatably supported on the clamp bracket 3 with a horizontal shaft 5 as a fulcrum.

An outboard motor main body 6, which is a propulsion device, is supported by the swivel bracket 4 so as to be rotatable about an axis substantially orthogonal to the horizontal axis 5, via a steering shaft (not shown). An internal combustion engine (not shown) is mounted on the outboard motor main body 6, and a propeller 7 rotates via a drive shaft.

A tilt device is interposed between the clamp bracket 3 and the swivel bracket 4, and as shown in FIG. has been done. The tilt cylinder 10 is provided with a tilt rod 11, the tip of which is rotatably connected to the swivel bracket 4 via a pin 12.

Further, the clamp bracket 3 is equipped with a trim device, and a trim cylinder 13 of this trim device is provided with a trim rod 14 so as to be extendable and retractable.

The tip 14a of the trim rod 14 is formed into a spherical shape, and this tip comes into contact with a load receiving portion of the outboard motor main body 6 via a thrust receiver 15. The thrust receiver 15 has a thrust receiving part 15a and a shaft part 15b, and the shaft part 15b is connected to the load receiving part 1 of the swivel bracket 4.
6 and is fixed by tightening with a nut 17.

The thrust receiver 15 has a second thrust receiving portion 15a.
As shown in FIGS. 4 to 4, the contact portion 15c that comes into contact with the tip 14a of the trim rod 14 is formed into an oval shape that is long in the direction of movement of the trim rod during tilt operation, that is, in the sliding direction, and its surface is It has a concave shape with a predetermined curvature.

A large number of grooves 18 are formed parallel to each other in the trim rod moving direction on the surface of the contact portion 15c of the thrust receiving portion 15a.
While maintaining continuous contact with a, the contact area between the two is reduced.

This thrust receiver 15 is made of, for example, stainless steel that has corrosion resistance and wear resistance.

Further, the direction of the groove 18 formed in the contact portion f5c is preferably parallel to the trim rod moving direction, but is not limited thereto, and is directed toward the trim rod moving direction, and is continuous with the tip portion t4a of the trim rod 14. It would be good if you could contact. Further, the number of grooves 18, the distance D between the grooves 18, the depth H, etc. can be arbitrarily set depending on the type of outboard motor, the frequency of operation of the trim device, the thrust load, etc.

Further, the cross-sectional shape of the groove 18 may be tapered and deepened as shown in FIG. 5, or the bottom surface may be circularly recessed as shown in FIG.

Furthermore, this groove 18 may be coated with grease.
In this case, the grooves 18 also function to retain grease. Further, a hollow insertion hole is formed in the shaft portion 15b of the thrust receiver 15 to serve as a grease chamber, grease is injected into this grease chamber from the rear, a grease nipple is attached to the hollow insertion hole, and the grease injected into the hollow insertion hole is removed. may be gradually supplied to the groove 18.

On both sides of the trim cylinder 13, a hydraulic drive device 19 for driving a tilt device and a trim device is mounted on a bracket 10.
The hydraulic drive device 19 is driven to supply pressure fluid to the tilt cylinder 8 and trim cylinder 13 to extend and retract the tilt rod 11 and trim rod 14, respectively.

Next, the operation of this embodiment will be explained.

When trimming up the outboard motor main body 6, the hydraulic drive device 19 is driven to supply pressure fluid to a lower chamber (not shown) of the trim cylinder 13 to extend the trim rod 14 in the cylinder axial direction. As a result, the tip end 14a of the trim rod 14 is connected to the thrust receiver 15 of the thrust receiver 15.
Push 5a. Therefore, the outboard motor main body 6 rotates counterclockwise in FIG. 2 with the horizontal shaft 5 as a fulcrum via the swivel bracket 4, and the trim angle is controlled according to the cruising condition.

To trim down, when the lower chamber of the trim cylinder 13 is opened and pressure fluid is supplied to the upper chamber, the trim rod 14 is contracted.
The propulsion unit 6 returns to its original position by its own weight and the propulsive force of the propeller 7.

In controlling this trim angle, as the trim rod 14 expands and contracts, the tip 14a of the trim rod 14 and the contact portion 15c of the thrust receiver 15 slide, and the contact position thereof changes. Although the sliding movement is performed in this manner, the groove 18 formed in the contact portion 15c of the thrust receiver 15 maintains continuous contact between the two, and the contact area between the two is reduced. Therefore, the slip phenomenon occurring between the contact parts is reduced, and the occurrence of stick can be suppressed.

Incidentally, the tilting up and down of the outboard motor main body 6 is performed by switching and supplying pressure fluid to a lower chamber and an upper chamber (not shown) of the tilt cylinder 8 by driving the hydraulic drive device 19, and moving the tilt rod 11 up and down. It will be done.

Further, in this embodiment, via the thrust receiver 15,
The trim rod 14 and the load receiving portion of the outboard motor body 6 are in contact with each other, but without using the thrust receiver 15, they are directly brought into contact with each other, and at least one of the contact portions is provided with a groove in the direction of movement of the trim rod. may be formed. Further, in the case where the thrust receiver 15 is used, it is also possible to fix the thrust receiver 15 to the tip end 14a of the trim rod 14.

Furthermore, in the above embodiment, the groove 18 has a thrust receiver μ1.
Although the concave contact portion 15c of the contact portion 1
5c may be made convex, and the tip end 14a of the trim rod 14 may be made concave so that they come into contact with each other, forming a convex contact portion 15c.

(Effects of the Invention) As described above, in this invention, a groove in the trim rod moving direction is formed in at least one of the load receiving part of the propulsion unit body and the contact part with the trim rod, so that the trim angle can be controlled. Even when the contact area between the trim rod and the load receiving part of the propulsion unit slides, the contact area between the two is reduced, while maintaining a continuous state of contact between the two.
Accordingly, the slip phenomenon during sliding can be reduced, and the occurrence of sticks can be suppressed. Therefore, with a simple structure that does not use a ball or the like as in the prior art, it is possible to prevent abnormal noises from occurring during the trim operation.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view of a trim device to which the present invention is applied;
Fig. 2 is a partially cutaway side view of the thrust receiver, Fig. 3 is a left side view of Fig. 2, Fig. 4 is a sectional view taken along ■-IV of Fig. 3, and Figs. 5 and 6 are the thrust receiver. A sectional view of another embodiment of the receiver, and FIG. 7 is a side view of a boat equipped with an outboard motor. In the figure, 3 is a clamp bracket, 4 is a swivel bracket, 5 is a horizontal shaft, 6 is an outboard motor body, 13 is a trim cylinder, 14 is a trim rod, 14a is a tip, 15 is a thrust receiver, 15a is a thrust receiving part , 15a is a shaft portion, 15c is a contact portion, 16 is a load receiving portion, and 18 is a groove. Figure I Figure 2 Figure 3 Rejection Figure 4 Figure 5 Rejection Figure 6 Figure 7

Claims (3)

[Claims] (1) The propulsion unit is supported rotatably around a substantially horizontal axis by a support bracket fixed to the hull, and the trim rod of the trim cylinder provided on the support bracket is attached to the load receiver of the propulsion unit. In a trim device for a marine propulsion device that abuts and supports and controls the trim angle of the propulsion device by expansion and contraction of the trim rod, at least one of a load receiving portion of the propulsion device body and a contact portion with the trim rod is provided. A trim device for a marine propulsion device, characterized in that a groove is formed in the direction of movement of the trim rod. (2) The load receiving portion of the propulsion unit and the trim rod are brought into contact via a thrust receiver, and a groove in the trim rod movement direction is formed in the contact portion of the thrust receiver. A trim device for a marine propulsion device according to scope 1. (3) The thrust receiver is attached to a load receiving portion of the propulsion unit main body, and a groove in the trim rod movement direction is formed in a contact portion of the thrust receiver that contacts the trim rod. Paragraph 1 or 2
Trim device for marine propulsion equipment as described in .