JPS6220791A - Tilt device for outboard motor - Google Patents

Abstract

PURPOSE:To reduce an initial operating force for a tilt-up operation, by providing a tilt assist spring between a hull and an outboard motor. CONSTITUTION:A tilt assist spring 11 is provided on an outboard motor 6 side with respect to a tilt pin 3. The upper end of the tilt assist spring 11 is connected to a clamp bracket 1, and the lower end is connected to a lower end of a swivel bracket 4. With this arrangement, an initial operating force for a tilt-up operation may be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a tilt device for tilting an outboard motor body.

In conventional outboard motors, the outboard motor main body is mounted so as to tilt upward relative to the hull, and is kept in this tilted-up state when stored.

Problems to be Solved by the Invention Manually performing such a tilt-up operation requires considerable force, and it is difficult to easily perform such a tilt-up operation, especially in a diesel outboard motor with a large M amount. A structure that can do this is needed. This invention was made with the aim of meeting such demands.

Means for Solving the Problems In order to achieve the above object, the present invention provides a hull (2)
In a tilt mechanism in which the outboard motor main body (6) side tilts upward with respect to the side, when the above-mentioned hull (2) is tilted, the outboard motor main body (
When the outboard motor main body (6) (JllJ) is tilted down, the outboard motor main body (6) ) is a tilt assist spring that acts in the direction of tilting up the
11).

Operation When tilting down, for example, the tilt assist spring (11) that is in a tensioned state acts in a direction to tilt up the outboard motor body (6) due to its contracting force. Operation force can be reduced.

EXAMPLE The configuration of the present invention will be explained below based on the illustrated example. In the figure, (1) is the transom (2) of the hull.
This clamp bracket (1) has a horizontal tilt pin (3) attached to it.
A swivel bracket (4) is supported so as to be rotatable in the vertical direction. This swivel bracket (4)
An outboard motor main body (6) is supported via a vertical swivel shaft (5) so as to be swingable in the left-right direction.

The outboard motor main body (6) has a propeller (7) at the lower end, a drive unit case (8) that houses a power transmission mechanism to the propeller (7), and is mounted on the drive unit case (8). It consists of an engine (1p) covered by a cowling (9), centered around a tilt pin (3) that supports the swivel bracket (4), and along with this swivel bracket (4), the engine (1p) is covered by a cowling (9). It is designed to be stored by tilting up to the desired position.

In the tilt-up mechanism as described above, in this embodiment, the upper end thereof is connected to the clamp bracket (1) at a position closer to the outboard motor body (6) than the tilt pin (3), and the lower end thereof is connected to the swivel bracket. A tilt assist spring (11) connected to the lower end of (4) is provided, thereby reducing the operating force at the initial stage of tilt-up ts.

Next, the structure of the tilt assist spring (11) will be explained based on FIG. 1. Note that a pair of tilt assist springs (11) are provided on both the left and right sides of the swivel shaft (5), but since their structures are the same, only one side is shown.

In Fig. 1, a horizontal support shaft (12) is attached to the clamp bracket (1) so as to pass through the clamp bracket (1), and the outer end of this support shaft (12) extends outward from the clamp bracket (1). At the same time as protruding, a swinging member (1
3) is attached via a sleeve (14).
(15) is an outer cylinder (16) on the upper side and an inner cylinder (16) on the lower side.
17), and the inner cylinder (17) is
The length of the entire case can be expanded and contracted by sliding inside the outer cylinder (16), and the upper end of the outer cylinder (16) extends toward the end of the swinging member (13). Screws (18
) is fixed by And this spring case (
15) The tilt assist spring (11) housed inside has its upper end retaining portion (19) engaged with the outer periphery of the sleeve (14) at the outer end of the support shaft (12).

On the other hand, the lower end of the swivel bracket (4) is integrally formed with an extending portion (20) that extends largely outward, and at the tip of this extending portion (20), another support shaft (21 ) is penetrated and supported, and a swinging member (22) similar to the above is swingably fitted onto the end of a support shaft (21) that projects outward from the extension (20). installed. The end of the lower inner cylinder (17) is fixed to the end face of the swinging member (22) via a screw (23), and the lower end engaging portion (24) of the tilt assist spring (11) A tilt assist spring (11) is engaged with the support shaft (21), and is thus connected between the clamp bracket (1) and the swivel bracket (4).

Next, the function of the tilt assist spring (11) will be explained. In the state shown in FIG. 2, the outboard motor main body (6) is in a tilted down state, which is a normal cruising attitude, and in this state, the tilt assist spring (11) is in a tensioned state. Here, in FIG. 2, from the center of the tilt pin (3), which is the center point of the tilt rotation of the outboard motor main body (6), to the connection point of the tilt assist spring (11) on the outboard motor main body (6) side. The distance to the center of the support shaft (21) on a certain swivel bracket (4) side is 11,
Let P be a circular arc centered on the tilt pin (3) with 21 as the radius. On the other hand, as the tilt amplifier of the outboard motor body (6) operates, the support shaft (4) on the swivel bracket (4) connecting the lower end of the tilt assist spring (11)
21) is the support shaft (12) on the clamp bracket (1) side.
Since it rotates around , the distance between them is 12,
The arc drawn with this 12 as the radius is Q. Comparing these arcs P and Q, it is found that at the intermediate position where the tilt is amplified from the tilt down position, both the support shafts (12
) (21) It can be seen that the distance between is shorter than in the tilt-down state. Therefore, when the tilt assist spring (11) is in a tensioned state during the tilt down, the force in the direction of returning to its original state causes the support shaft (21) on the swivel bracket (4) side to move over the length of the tilt assist spring (11). This appears as a force that tries to move the camera to the intermediate point where it is at its minimum, so this reduces the force required during the tilt-up operation. Furthermore, after passing this halfway point, the tilt assist spring (11
) will be pulled, and the resistance blade will give the impression that it will make the tilt rotation operation heavier, but after passing this halfway point, the weight of the engine (1o) at the top will cause the engine (1o) to tilt up. (Therefore, no auxiliary force is needed after this intermediate point.

Effects of the Invention As described above, according to the present invention, the tilt assist spring provided between the hull side and the outboard motor body side reduces the operating force at the initial stage of tilt amplifier operation, so less force is required than before. The effect of being able to perform a tilt operation is obtained.

[Brief explanation of the drawing]

Figure 1 is a vertical sectional view of the main part taken along line A-A in Figure 2;
FIG. 2 is a side view of the entire outboard motor equipped with a tilt assist spring. (2)...hull transom, (6)...outboard motor body, (11)...tilt assist spring.

Claims (1)

[Claims] In a tilt mechanism in which the outboard motor main body side tilts upward relative to the hull side, a state in which a force is applied between the hull side and the outboard motor main body side when the outboard motor main body side is tilted down. A tilt device for an outboard motor, characterized in that a tilt assist spring is provided that acts in a direction to tilt up the outboard motor body between this state and an intermediate position of the tilt up position.