DE8902672U1 - Outboard motor with a protective cover for the propeller - Google Patents

Description

• · · did · ■·· ··«■

Outboard motor with a protective cover for the propeller

The invention relates to an outboard motor according to 5

Preamble of claim 1.

In an outboard motor, the propeller is located at the lower end of the drive shaft, which results in two significant

Hazard characteristics arise. 10

On the one hand, the propeller endangers living creatures in the water, especially swimmers, who Contact with the propeller can result in injury. This applies in particular to propellers used in diving operations, whereby the danger in this case relates in particular to the diver(s).

On the other hand, the propeller itself is at risk if it runs aground or comes into contact with foreign objects, such as rocks. Contact or impact with such foreign objects can easily lead to the propeller breaking, which can limit or even completely eliminate the boat's maneuverability.

j ' ' 25

-j The invention is based on the task of improving the propeller of the

outboard motor from contact with the ground or lateral contact with foreign objects while ensuring a simple, stable and cost-effective construction.

I: 30

This object is achieved by the characterizing features of _: '] claim 1.

f In the embodiment according to the invention, the propeller is

ring-shaped protective sheath surrounding it, which is attached at oo V its upper and at its lower end to the existing

&eeacgr; Anticavation plate and held at the existing spur.

3 t * · ■ · &igr; C · ■ · ■ ·

The protective cover can be formed by integral molding onto at least one of the aforementioned parts or it can also be detachably attached to one of the aforementioned parts, preferably by screws. This not only

a simple construction is achieved because the protective cover can be held to the aforementioned parts of the outboard motor by small and therefore light holding elements, but a stable fastening is also achieved, whereby not only the protective cover itself but also the supporting fastening parts of the drive shaft are protected from damage. The design according to the invention also contributes to the stabilization of an anti-cavitation plate and the spur, because the

Protective cover acts as a stabilizer for these parts. 15

Advantageous further developments of the invention, which also contribute to solving the problem and are also well suited to a flow-optimized design, are described in the subclaims.

The invention is explained in more detail below using a preferred embodiment shown in a drawing. It shows

F1g. 1 one with a protective cover for the propeller

outboard motor designed according to the invention in side view;

_on Fig- 2 the lower end of the drive shaft with the

Protective cover 1n rear view; Fig. 3 the protective cover 1 &pgr; de* top view. The essential parts of the outboard motor marked 1

are a motor housing 1, a drive shaft 2 extending downwards from it, at the lower end of which a

Gear housing 3 is detachably attached to the drive shaft 2 or integrally mounted therewith, from which an output shaft 4 extends to the rear, on which a propeller 5 is arranged at the rear of the gear housing.

A cavity plate 6 extends from the drive housing 3 or from the drive shaft 2 at the rear above the propeller 5 and extends in one piece from the drive housing J or from the drive shaft 2.

The protective casing, generally designated 7, consists of a cylindrical, self-contained sheet metal ring surrounding one wing r of the propeller 5 at a distance s, which is attached to the anti-cavitation plate 6 and to the b by means of holding parts 9, 11 arranged at its upper and lower ends.

<\n-, lower end of the drive shaft 2 or gear housing 3 forming spur 12 is attached. The upper holding part 9 is formed by two strips 13, 14 extending in the longitudinal or driving direction of the outboard motor, spaced apart by a distance b from each other, which are on the underside and

are adapted on the upper side to the shape of the outer surface 15 and the protective casing 7 and the underside 16 of the anti-cavitation ^plate 6. The outer surface 15 is circular, while the underside 16 can be rounded or shaped in the sense of an obtuse angle open at the top with respect to the outer surface. The upper and lower surfaces of the strips 13, 14 are adapted accordingly, preferably by rounded surfaces or inclined surfaces.

The protective casing 7 formed by the sheet metal ring, which can be designed in the sense of a closed ring or with a longitudinal joint 7.1 preferably at the upper end , is secured at its upper end by means of four fastening screws 17 ar

the anti -cavitation plate 6, which the &ogr;&ogr;

Anti cavitation plate 6 in through holes 18 and in essentially vertical threaded holes 19 of the

Strips 13, 14. The four fastening screws 17 are arranged one behind the other on both sides of the drive shaft 2 in the longitudinal direction.

As can be seen from Fig. 1, the Protective casing 7 between the gear housing 3 and a guide plate 21 arranged at the free end of the anti-cavity plate 6 and projecting downwards. The protective casing 7 is of such a length that it completely covers the propeller 5 at the sides.

The holding part 11 arranged at the lower end of the protective casing 7 consists of two Wangeriblecf ?n 23, which

the distance c from each other corresponding to the edge of the spur 12 15

on the outer surface 15 of the sheet metal ring 10 preferably inseparably The cheek plates 23 have a hammerhead-shaped, with a si. h under the

^R lechr1ng 10 extending shaft part 24 and oinem from

Sheet metal ring 10 extending towards the front and upwards 20

Head part 25. The cheek plates 23 are connected by means of

pointing wings 2β are attached to the outer surface 15 of the sheet metal ring 10, which are formed by lateral bends or unwindings of the shaft parts (24). The attachment to the spur 12 is carried out by one or two screws 20, preferably arranged one behind the other in the direction of travel, which pass through the spur 12 and the head parts 25 of the Wanger ileche 23 in holes 20.1.

As can be seen most clearly from Figure 2, ~

between the head parts 25 of the cheek plates 23 the lower End of the spur 12. The space downstream of the spur 12 between the shaft parts 24 of the cheek plates 23 is filled with a filler or spacer 27 with the thickness c in

Form of a flat part, which preferably covers the lower 35

edges 28 of the shaft parts 24. When

In the present embodiment, the cheek plates 23 are

30

· ■ ·

I t · I

&bull; · »I

the spacer ¹ ICk 27 and welded to the sheet metal ring ,10, namely on the longitudinal edges 29 and on the lower longitudinal edges of the shaft parts 24, thereby forming fillet welds 31.

are possible. The front parts 25 of the 5

Cheek area 23 bevelled upwards, see

Inclined surface 33, the inclination being adapted to the existing inclination of the spur 12. Preferably, the design is such that the head parts 25 protrude slightly beyond the spur 12 by the dimension d, whereby additional protection is created for the spur 12 .

The sheet metal ring 10 or the protective cover 7 1 is thus

Holding parts 9, 11 in a stable bracket on the drive housing 3 or 15

1m lifting shaft 2, whereby the sheet metal ring extends cantilevered between the holding parts 9, 11.

The individual parts of the protective casing 7 preferably consist of an aluminum alloy or of a stainless steel

35

Claims (12)

1. Outboard motor with a motor housing (1), a drive shaft (2) extending downwards from the latter, a propeller (5) arranged at the lower end of the drive shaft (2), preferably at the rear thereof, which propeller is mounted on a horizontal drive shaft (5) extending from the drive shaft, a guide element (6) (anti-cavitation plate) extending from the drive shaft and extending above the propeller, and a guide element (6) connected to the lower end of the drive shaft (2). CnAi^n I &Lgr; O \ >^K ^V '" \ ·* *- / f characterized in that the propeller (5) is surrounded by an annular, axially open protective casing (7) which is detachably attached to the guide element (6) and the spur (12) or is formed in one piece. 2. Outboard motor according to claim 1, characterized in that the protective casing (7) is formed by a cylindrical sealing ring (10) which has holding parts (9, 11) for its fastening at its upper and lower ends . Postal address: &Ggr; USU dill XU Ui Ji. D-8000 Munich 26 Office address: MühcKen 22 Accounts for official fees: Pcstgirc Munich, Account !95 75-803 (bank code 700!0080) EPA Account 28000206 3. Outboard motor according to claim 2, characterized in that the upper holders (9) are formed by at least one, preferably by two projections (13, 14) which are spaced apart (b) from one another and extend in the longitudinal direction, on the outer surface (15) of the sheet metal ring (10), the upper sides of which rest against the underside (16) of the guide element (6). 4. Outboard motor according to claim 3, characterized, ^ that the upper holding part (9) is supported by at least two, preferably four, on both sides of the Drive shaft (2) arranged fastening screws (17) which pass through the guide element (6) from above in through holes (18) and ■? ■ holes (19) 1n the projections (13, 14). 5. Outboard motor according to at least one of claims 1 to 4, characterized in that that the lower holding part (11) is Outer surface (15) of the protective casing (7) 1st, extending from the protective casing (7) in the longitudinal direction to the f _oc . Spur (12) extends laterally to this and &ngr; 2b is fastened to the spur (12) by at least one, preferably two, screws (20) passing through the holding part (11) and the spur (12) in holes (20.1). 6. Outboard motor according to claim 5, characterized in that the holding part (11) extends to both sides of the spur (12). 7. Outboard motor according to claim 5 or 6, 35 characterized in that the holding part (11) is provided by a one-sided or two-sided spur (12) Cheek plates (23) are formed in a hammerhead shape, the head part (25) of which rests on the spur (12) and the shaft part (24) of which extends along the outer surface (15) of the protective casing (7). 8. Outboard motor according to claim 7, characterized in that the cheek plate (23) with a laterally bent wing (26) is in contact with the outer surface (15) of the protective casing (7; 9. Outboard motor according to claim 8, characterized in that the cheek plates (23) have wings (26) which are bent or angled symmetrically with respect to the longitudinal center plane of the holding part (11). 10. Outboard motor according to claim 8 or 9, characterized in that that the free space between the holding parts (23) located at the rear of the spur (12) is filled by a filling or spacer piece (27) which preferably projects downwards beyond the lower edges (28) of the holding parts (23). 11. Outboard motor according to at least one of claims 5 to 10, characterized, gO that the lower holding part (11) is adapted at its free end to the contour or the oblique course of the spur (12) and preferably projects slightly beyond it. 12. Outboard motor according to at least one of O^ claims 1 to 11, characterized in that the upper and lower holding parts (11) are connected to the Protective sheath (7) are welded.