JPS627037B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises fitting one end of a steering handle to the outer side of a cowling that houses an engine through a rubber cylindrical vibration isolating member, and attaching the steering handle to the cowling. This invention relates to a mounting structure for a steering handle in an outboard motor.

Generally, the steering handle of an outboard motor is fitted to the outside of the bottom cowling of the cowling that houses the engine, and is fitted with a cylindrical anti-vibration structure to suppress or prevent the transmission of engine vibrations to the steering handle. Attached via rubber. By the way, this anti-vibration rubber has the property that the lower the rubber hardness (softer it), the higher the effect of preventing the transmission of engine vibration, and the higher the rubber hardness (harder), the better the operability of the steering wheel becomes. ing. Therefore, in conventional outboard motors, it has not been possible to satisfy both the vibration isolation and operability requirements of the steering handle.

The present invention has been made in view of these circumstances, and its main purpose is to improve both the vibration isolation and operability of the steering handle in this type of outboard motor.

Hereinafter, the present invention will be explained based on the drawings. FIG. 1 shows an example of an outboard motor embodying the present invention. The main body 10 of this outboard motor includes a cowling 1
The engine unit is housed in the swivel bracket 21, and the power transmission unit, output unit, etc. are housed in the casing 10b, which protrudes downward from the bottom of the cowling 10a.
It is attached so that it can be moved laterally and detachably. The swivel bracket 21 is vertically movably attached to a clamp bracket 22 fixed to the stern plate of a small boat, so that the outboard motor main body 10 can be vertically movable together with the swivel bracket 21. The cowling 10a is composed of a top cowling 11 and a bottom cowling 12, and a steering handle 30 is attached to the front left side of the bottom cowling 12. As a result, the outboard motor main body 10 can be steered by moving left and right by operating the steering handle 30, and can also be rotated through 180 degrees to enable buggy operation. Note that the outboard motor main body 10 includes a propeller 40 assembled on a propeller shaft (not shown).
Propulsive force is generated by

As shown in FIG. 2, the steering handle 30 has a handle base 3 bent into an L-shape.
1 and a handle handle part 32 rotatably attached to the tip of the handle base 31, and the rear end of the handle base 31 has a stepped cylindrical attachment part 31a.
is formed. The attachment portion 31a of the handle base 31 is fitted into an attachment opening 12a provided on the front left side of the bottom cowling 12 via a bush 33 and a vibration isolating member 34. In addition, the mounting part 31
A handle cover 35 is attached to the end face of the cowling 10a from inside the cowling 10a. A vibration isolating rubber 35a is attached to the steering wheel cover 35, and the vibration isolating rubber 35a is attached to the steering wheel cover 35.
゜It functions as a positioning and lateral stopper during rotation. Note that one end of the steering handle 30 is located inside the handle base 31 of the steering handle 30.
An operating rod 36 fixed to the throttle lever 1 is rotatably supported, and the throttle lever 1 is connected via a throttle wire 37 by rotating the handle handle 32.
3, the throttle valve opening degree is increased or decreased.

The vibration isolating member 34 is made of rubber, and is composed of a cylindrical portion 34a and an annular flange portion 34b integrally formed at the end thereof, as shown in FIGS. 3 to 5. ing. A large number of ribs 341 extending in the axial direction are provided on both the inner and outer circumferential surfaces of the cylindrical portion 34a.
342 are formed at a predetermined interval, and a large number of ribs 343, 344 extending radially in the radial direction are formed on both sides of the flange portion 34b at a predetermined interval. Each of these ribs 341 to 34
4 is formed in a size that makes contact with the edge of the attachment opening 12a provided on the bottom cowling 12, the outer periphery of the bush 33, etc. in the fitted state shown in FIG. The vibration isolating member 34 is made of rubber having a higher hardness than conventional vibration isolating members, and the cylindrical portion 34a and the flange portion 34b have high rubber hardness and are poor in flexibility. rib 3
Since 41 to 344 are formed in a strip shape, they are more flexible and easily deformed than the cylindrical portion 34a and the flange portion 34b.

In an outboard motor in which the steering handle 30 is attached using the vibration isolating member 34 configured as described above, the vibration isolating member 34 of the steering handle 30 is connected to the bottom cowling 12 side and the bottom cowling 12 side via the ribs 341 to 344 when the steering handle 30 is not operated. Steering handle 3
0 side, and the contact area with the bottom cowling 12 side and the steering handle 30 side is small. Therefore, the vibration isolating member 34 exhibits high vibration damping properties due to the action of the ribs 341 to 344, which are highly flexible and have a small contact area. On the other hand, when the steering handle 30 is operated, each of the ribs 341 to 344 of the vibration isolating member 34 is compressed and deformed by the operating force. For this reason, the vibration isolating member 34 receives the operating force over its entire surface, and the vibration isolating member 34 exhibits characteristics due to its high rubber hardness. That is, the spring constant of the vibration isolating member 34 increases rapidly due to the operating force of the steering handle 30, and the operability of the steering handle 30 improves. Therefore,
In this outboard motor, the steering handle 3
It is possible to improve the operability of the vibration isolation system.

In addition, especially in this embodiment, since the steering handle 30 is attached so as to be rotatable 180 degrees from the front to the rear, the outboard motor main body 10 can be rotated 180 degrees to provide steering when backing up a small boat. The handle 30 has good operability, and the work of removing and transporting the outboard motor main body 10 from the swivel bracket 21 is safer and easier. Further, since the anti-vibration rubber 35a is attached to the handle cover 35, which functions as a stopper for positioning the steering handle 30 and in the left-right direction, the anti-vibration effect during positioning is also great.

In this embodiment, an example is shown in which the vibration isolating member 34 is formed with ribs 341 to 344 that contact both the bottom cowling 12 side and the steering handle 30 side.
A vibration isolating member formed with ribs that contact only the sides may be employed, or a vibration isolating member formed with annular ribs instead of striped ribs extending in the axial and radial directions may be employed.

As explained above, in the present invention, one end of the steering handle is fitted to the outer side of the cowling that houses the engine via a rubber cylindrical vibration isolating member, and the steering handle is attached to the cowling. The outboard motor is characterized in that the vibration isolating member is formed by forming ribs on the contact surface that contacts at least one of the cowling and the steering handle. It is possible to improve the vibration damping performance when the steering wheel is not being operated, and it is also possible to increase the spring constant of the vibration damping member by the operating force when the steering wheel is being operated, thereby improving the operability of the steering handle.

[Brief explanation of the drawing]

Fig. 1 is a side view showing an example of an outboard motor embodying the present invention, Fig. 2 is an enlarged cross-sectional plan view showing the main parts of the outboard motor, and Fig. 3 is an illustration of the vibration isolating member adopted in the outboard motor. 4 is a plan view taken in the direction of the arrow in FIG. 3, and FIG. 5 is a plan view taken in the direction of the arrow in FIG. 3. Explanation of symbols, 10... Outboard motor body, 10a...
Cowling, 10b...Casing, 12...Bottom cowling, 21...Swivel bracket,
22... Clamp bracket, 30... Steering handle, 31... Handle base, 34...
Anti-vibration rubber, 34a...cylindrical part, 34b...flange part, 341-344...rib.

Claims (1)

[Claims] 1. In an outboard motor in which one end of the steering handle is fitted to the outer side of a cowling that houses the engine via a rubber cylindrical vibration isolating member, and the steering handle is attached to the cowling, the vibration isolating member A mounting structure for a steering handle, characterized in that a vibration isolating member is formed with a rib formed on a contact surface that contacts at least one of the cowling and the steering handle.