JPH045197A - Mounting structure for steering pin gimbal of in/ outboard machine - Google Patents

Abstract

PURPOSE:To prevent a gimbal ring from being destroyed under pressure by fixingly casting an insert member provided with a plurality of tooth pieces on the outer periphery thereof while with serration on the inner periphery, which insert member is made of a material of higher mechanical strength than the gimbal ring, in a steering pin support part at the upper part of the main body of gimbal ring. CONSTITUTION:A gimbal mounting structure is provided with an upper steering pin support part 2, by which a steering pin 7 composed of a steering arm mounting part and involute serration part 8 is supported. In this case, a steering pin fitting hole 6 is formed at the center of a square body made of a material with a higher mechanical strength than the gimbal ring 1, and an insert member 3 for fitting the steering pin 7 is provided with an involute serration 4 on the inner peripheral face of its hole 6 while with two tooth pieces 5 on opposed sides of the outer periphery of the square body. The gimbal ring 1 is formed while it has an insert member cast in around the center of upper steering pin support part 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a gimbal mounting structure for an upper steering pin of an inboard/outboard motor.

C. Prior Art] A conventional gimbal ring, for example, as shown in Fig. 6,
The gimbal ring main body 1 is provided with an upper steering pin support part 2 at the upper part, a lower steering pin support part (not shown) at the lower part, and is integrally formed of aluminum casting. A steering pin fitting hole is bored approximately at the center of the upper steering pin support portion 2, and an involute serration 20 is formed on the inner peripheral surface of the fitting hole.

Further, the steering pin 7 includes a steering arm mounting portion, a shaft support portion, and an involute serration portion 8.

To attach the steering pin 7 to the gimbal ring, attach the steering pin 7 to the gimbal ring main body.
The steering arm is attached by passing it through the steering pin fitting hole and pivotally supporting it to the transom shield 9 via the bracket 10, and fitting the involute serration part 8 of the steering pin 7 to the involute serration 20 of the gimbal ring. Attach the steering arm 1 to the part with the mounting bolt 14, and attach the snap rings 12 and 13 to both ends of the steering pin 7.
was installed.

In addition, other conventional gimbal rings include, for example, the seventh gimbal ring.
As shown in the figure (see Japanese Unexamined Patent Publication No. 55-152396), a substantially square steering pin insertion hole 22 is formed approximately at the center of the steering pin support portion on the upper part of the gimbal ring main body 21. A slit 23 is formed from the opposite corners of 22. And steering pin 25
is provided with a fitting portion 26 having a substantially square cross section corresponding to the fitting hole 22.

To attach the steering pin 25 to the gimbal ring, the fitting part 26 of the steering pin 25 is fitted into the fitting hole 22 of the gimbal ring main body 21, and the slit 23 is perpendicular to the gimbal ring main body l. The steering pin 25 was fixed by tightening the mounting bolt 24 from the side and tightening the fitting hole 22.

[Problem to be solved by the invention]

However, in the steering pin gimbal mounting structure shown in FIG. 6, the involute serrations 20 of the gimbal ring were easily crushed because the mechanical strength of the aluminum casting was lower than that of the steering pin. In order to avoid this drawback, the height and width of the teeth of the involute serrations 20 may be increased, but this may cause layout problems due to the remaining wall thickness of the steering pin support portion 2 of the gimbal ring. there were.

Furthermore, in the conventional example shown in FIG.
The machining of the fitting portion 26 of the gimbal ring and the machining of the steering pin fitting hole 22 of the gimbal ring were corner machining, making it difficult to achieve machining accuracy and making it unsuitable for mass production.

The present invention aims to provide a steering pin gimbal mounting structure for an inboard/outboard motor that eliminates these conventional drawbacks.

[Means to solve the problem]

In the present invention, a steering pin fitting insert member made of a material with higher mechanical strength than the gimbal ring and having serrations on the inner periphery and a plurality of external teeth on the outer periphery is cast and fixed to the steering pin support part on the upper part of the gimbal ring main body. This is a steering pin gimbal mounting structure for inboard and outboard motors.

[For production]

The insert member is made of a material with higher mechanical strength than the gimbal ring, and the external teeth are cast into the gimbal ring.
Since torque is distributed and transmitted to the gimbal ring via the external teeth, crushing of the gimbal ring is prevented.

In addition, since the insert member has four to six external teeth formed on the outer periphery, and the external teeth have a substantially trapezoidal shape with a large root width, surface stress on the gimbal ring can be reduced, and crushing of the gimbal ring can be prevented. Since the external teeth have the same outer diameter, manufacturing is easy.

〔Example〕

An embodiment of the present invention will be described based on FIGS. 1 and 2. The steering pin fitting insert member 3 is provided with a steering pin fitting insert member 3 at the center of a rectangular body made of a material (stainless steel) with higher mechanical strength than a gimbal ring. A pin fitting hole 6 is formed, an involute serration 4 is formed on the inner circumferential surface of the fitting hole 6, and two external teeth 5 are formed opposite to the outer circumference of the rectangular body.
It is equipped with the following. The gimbal ring has an upper steering pin support portion 2 at the top of the gimbal ring main body 1.
The insert member 3 is cast into a substantially central portion of the housing and is integrally formed with an aluminum casting.

The steering pin 7 is composed of a steering arm mounting portion, a shaft support, and a serration portion 8 having involute serrations, and the material thereof is stainless steel mesh, preferably the same material as the insert member 3, thereby preventing electrolytic corrosion. Corrosion and sticking will not occur.

The method of installing the steering pin 7 will be explained based on FIGS. 1 and 3. The steering pin 7 is passed through the steering pin fitting hole 6,
The involute serration part 8 of the steering pin 7 and the involute serration 4 of the insert member 3 are fitted together, and the steering arm 1 is mounted on the steering arm mounting part.
1 with the mounting bolts 14, and snap rings 1213 are attached to both ends of the steering pin 7.

When the steering pin 7 is rotated by rotating the steering arm 11, the insert member 3 is made of a material (stainless steel) with higher mechanical strength than the gimbal ring, and the outer teeth 5 are inserted into the gimbal ring. Since the gimbal ring is cast into the gimbal ring, the torque is distributed and transmitted to the non-hull ring via the external teeth 5, thereby preventing the gimbal ring from being crushed.

Next, other insert members will be explained based on FIGS. 4 and 5. The steering pin fitting insert member 15 has involute serrations on the inner circumferential surface of the steering pin fitting hole 16 at the center of the cylindrical body made of stainless steel. 1
7, an annular flange 19 is formed on the outer peripheral surface of the cylinder, and four external teeth 18 are formed protruding from the flange 1971 at equal intervals,
The outer core teeth 18 have a generally trapezoidal shape with a large root width, and the tips of each outer tooth 18 have the same outer diameter. Note that the number of external teeth 18 is not limited to four, but may be at least four and no more than six.

With this configuration, the external teeth 8 of the insert member 15 are formed of 4 to 6 pieces, and the external teeth 1B are formed in a substantially trapezoidal shape with a large root width, so that the surface stress of the gimbal ring can be reduced. , the gimbal ring is prevented from being crushed. Furthermore, since the external teeth 18 have the same outer diameter, they can be manufactured easily.

〔Effect of the invention〕

In the present invention, a steering pin fitting insert member made of a material with higher mechanical strength than the gimbal ring and having serrations on the inner periphery and a plurality of external teeth on the outer periphery is cast and fixed to the steering pin support part on the upper part of the gimbal ring main body. Therefore, since the inner member is made of a material with high mechanical strength and the external teeth are cast into the gimbal ring, torque is distributed and transmitted to the gimbal ring via the external teeth.
The gimbal ring is prevented from being crushed.

In addition, since the steering pin fitting member forms 4 to 6 external teeth, and the external teeth have a substantially trapezoidal shape with a large root width, the surface stress of the gimbal ring can be reduced. Crushing is prevented, the external teeth have the same outer diameter, and if external teeth with different thicknesses are prepared, it can be applied to various models, and design and manufacture are facilitated.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one embodiment of the present invention, and FIG.
A perspective view of the steering pin fitting insert member shown in the figure.
Fig. 3 is an exploded perspective view of the assembly shown in Fig. 1, Fig. 4 is a sectional view showing a modified example of the insert member, Fig. 5 is a sectional view taken along line I-I in Fig. 4, and Fig. 6 is a conventional one. A longitudinal sectional view showing an example, and FIG. 7 is a plan view showing another conventional example. 1.21... Gimbal ring, 2... Steering pin support part, 3.15... Steering pin fitting insert member, 4.17.20... Involute serration, 5, 18... External tooth , 6.16.22... Steering pin fitting hole, 7.
25... Steering pin, 8... Involute serration section, 9... Transom shield, 10...
...butshu, 11...steering arm, 12.
13... Snap ring, 14.24... Mounting bolt, 19... Flange, 23... Slit, 26...
Fitting portion. Patent applicant Nissan Koki Co., Ltd.

Claims (2)

[Claims] (1) A steering pin fitting insert member made of a material with higher mechanical strength than the gimbal ring and having serrations on the inner periphery and a plurality of external teeth on the outer periphery was cast and fixed to the steering pin support part on the upper part of the gimbal ring main body. A steering pin gimbal mounting structure for inboard and outboard motors. (2) The steering pin fitting insert member is
2. The gear according to claim 1, wherein four to six external teeth are formed on the outer periphery, and each of the external teeth has a substantially trapezoidal shape with a large base width, and the tip of each external tooth has the same outer diameter. Steering pin gimbal mounting structure.