Shaft profile and outboard drive

Abstract

The invention relates to a shaft profile (11, 11 ', 11' ') for driving an outboard drive (1) of a ship (100), comprising a main body (15) extending along a longitudinal axis (12), the main body (15) comprising a receiving chamber (19) for receiving a shaft (10) of the outboard drive (1), at least three support ribs (16) extending in the direction of the longitudinal axis (12) being provided on an inner side (22) of the receiving chamber (19) for radially guiding the shaft (10). The invention also relates to an outboard drive (1).

Description

Technical Field

[0001] The invention relates to a shaft profile for an outboard drive for driving a boat, and an outboard drive for driving a boat. Background Art

[0002] Outboard drives are known drive mechanisms for boats. Usually, they are mounted at the stern of the respective boat via fastening devices, in particular a crossbar support. Boats can have different stern shapes. If there is a flat stern cover, it is also called a "crossbar". The crossbar can be tilted differently relative to the water surface. The crossbar can be perpendicular to the water surface, protrude obliquely from the water surface or be tilted in the direction of the interior of the boat. In addition, the inclination of the crossbar relative to the water surface can vary due to different states of the boat, in particular the driving state and / or the loading state.

[0003] The outboard drive comprises a drive unit, which is arranged underwater during operation. The drive unit comprises a propeller, by means of which a propeller is generated for propulsion. The drive unit is connected to a steering device of the outboard drive, for example a rudder, via a shaft for presetting a steering angle of the drive unit relative to a 0° direction, which corresponds to the bow-stern direction of the ship. The shaft is rotatably mounted on the fastening device about a steering angle-rotation axis.

[0004] It is known to cover the axle with an axle profile in order to optimize the axle in terms of fluid dynamics, in particular to reduce the flow resistance of water flowing around the axle and the eddies caused by the axle during driving. Therefore, the axle profile is used to reduce the flow resistance caused by water during driving.

[0005] The shaft profile can have an extruded molded base body comprising plastic or an extruded formed base body comprising a metal alloy. Conventional shaft profiles have a plurality of chambers and a so-called sheathing tube. The sheathing tube is a tube extending in the direction of the longitudinal axis of the shaft in the interior of the shaft profile, through which the cylindrical shaft extends. The shaft profile is supported at the shaft by the sheathing tube. Summary of the invention

[0006] Starting from the known prior art, the object of the invention is to provide an improved shaft profile for an outboard drive for driving a boat, and an improved outboard drive for driving a boat.

[0007] The object is achieved by a shaft profile for an outboard drive for driving a boat having the features of the invention. Advantageous developments emerge from the description and the drawings.

[0008] Correspondingly, a shaft profile for an outboard drive of a boat is proposed, which comprises a main body extending along a longitudinal axis, wherein the main body comprises a receiving cavity for receiving a shaft of the outboard drive.

[0009] At least three support ribs extending in the direction of the longitudinal axis for radially guiding the shaft are arranged spaced apart from one another in the circumferential direction with respect to the longitudinal axis on the inner side of the receiving chamber, ie on the radially inner side or wall surface with respect to the longitudinal axis.

[0010] The proposed shaft profile can thus be manufactured significantly lighter and more material-saving than conventional shaft profiles with a sheathing tube. Since the proposed shaft profile has only supporting ribs instead of a sheathing tube with a closed annular cross section with respect to the longitudinal axis, significantly less material is required to form the guidance and support of the shaft on the shaft profile or vice versa.

[0011] Furthermore, this allows a more slender design of the shaft profile compared to conventional shaft profiles with a sheathing tube. The more slender design results in less flow resistance and thus a higher efficiency of the outboard drive.

[0012] According to one embodiment, the supporting rib can have a rounded shape at its free end pointing radially inwards.

[0013] For example, at least one supporting rib can have a concave curvature at its free end, ie, curvature inwards relative to the supporting rib. Alternatively or additionally, at least one supporting rib can have a convex curvature at its free end, ie, curvature outwards relative to the supporting rib.

[0014] According to one embodiment, the base body can have exactly one chamber, wherein the receiving cavity is formed in this exactly one chamber. The base body can optionally include an outer wall of a preset wall thickness that is closed in the circumferential direction with respect to the longitudinal axis, and the outer wall surrounds the exactly one chamber when viewed perpendicularly to the longitudinal axis. In other words, the cross-sectional shape of the base body can optionally be formed by an outer wall of a preset wall thickness, and a supporting rib is formed on the inner side of the outer wall.

[0015] According to one embodiment, the base body can be designed at at least one of its end sides to be connected in a rotationally fixed manner about the longitudinal axis to a component of the outboard drive arranged at the end side, for example a drive unit of the outboard drive, for example a pod unit.

[0016] According to one embodiment, a connection portion, for example an elastic connection portion, can be provided at at least one of the end sides of the shaft profile relative to the longitudinal axis for optionally elastically connecting the shaft profile to a component of the outboard drive arranged at the end side, wherein the connection portion optionally provides a sealing portion of the shaft profile.

[0017] According to one embodiment, the shaft profile can have a cross-sectional outer contour viewed perpendicularly to the longitudinal axis, which is designed to be streamlined in a predetermined transverse direction, wherein the cross-sectional outer contour is designed to be teardrop-shaped, for example.

[0018] According to one embodiment, the main body can be formed in one piece, ie, from an uninterrupted material stack without connecting points such as screws.

[0019] According to one embodiment, the base body can be an extruded profile consisting of plastic, a continuously cast profile consisting of a metal alloy or a continuously pressed profile consisting of a metal alloy.

[0020] According to one embodiment, the shaft profile can include a spare rudder section for providing a spare rudder for a boat comprising an outboard drive. In the spare rudder section, the shaft profile has a predetermined length in the flow direction, which enables a torque to be generated from the circulating medium, which is large enough to provide control of the boat. In the spare rudder section, the length of the shaft profile, for example the base body, is greater in the transverse direction than the length of the coupling section of a drive unit, for example a pod unit, of the outboard drive. The spare rudder section can thus protrude in the transverse direction behind the coupling section.

[0021] According to one embodiment, the spare rudder section can extend in the range of the entire shaft profile, optionally in the range of the entire base body, in the direction of the longitudinal axis. Alternatively, the spare rudder section can extend in the range of a part of the shaft profile, optionally in the range of a part of the base body, in the direction of the longitudinal axis.

[0022] The shaft profile may comprise a plurality of base parts. The base may be formed from a plurality of base parts. At least one base part may optionally comprise a spare rudder section.

[0023] The above-mentioned object is also achieved by an outboard drive for a boat having the features of the invention. Advantageous developments emerge from the description and the drawings.

[0024] Accordingly, an outboard drive for a boat is proposed, which comprises a fastening device for fastening the outboard drive to the boat and a drive unit which is arranged on the fastening device so as to be rotatable about a steering angle rotation axis via a shaft.

[0025] The outboard drive may comprise a shaft profile according to at least one of the above described embodiments, which is arranged at the shaft between the fastening unit and the drive unit. Alternatively or additionally, the outboard drive may be configured for changing between a normal mode and a standby rudder mode.

[0026] In normal mode, a first shaft profile having a first length can be arranged between the fastening unit and the drive unit along a transverse direction oriented transversely to the steering angle-rotation axis, and in standby rudder mode, a second shaft profile having a second length different from the first length can be arranged between the fastening unit and the drive unit along the transverse direction.

[0027] In normal mode, the (first) shaft profile can be adapted to the joint section between the shaft profile and the drive unit. Thus, for example, a particularly low flow resistance can be achieved. In the standby rudder mode, the function of a standby rudder can be provided due to the greater (second) length of the (second) shaft profile. This is the case, for example, if the main rudder of the ship is lost or damaged during travel.

[0028] The outboard drive can be designed so that the shaft profiles can be exchanged, wherein, for example, a first shaft profile has a first length in a transverse direction oriented transversely to the steering angle rotation axis, while a second shaft profile has a second length different from the first length.

[0029] When the outboard drive is not fastened to the boat, i.e., for example, fastened to the stern of the boat, the conversion to normal mode and spare rudder mode can be performed. The conversion is performed by removing the first shaft profile and installing the second shaft profile, which for example includes the spare rudder section, and vice versa. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Advantageous further embodiments of the present invention are explained in detail by the following description of the drawings. Here, it is shown:

[0031] Figure 1 schematically showing a cross-section through a boat having an outboard drive;

[0032] Figure 2 Schematically shows Figure 1 Side view of the outboard drive in;

[0033] Figure 3 Schematically shows Figure 2 A perspective view of the shaft profile of an outboard drive in FIG.

[0034] Figure 4 Schematically showing the penetration Figure 3 A cross-sectional view of the shaft profile in FIG.

[0035] Figure 5 schematically shows a section through a shaft profile according to another embodiment;

[0036] Figure 6 Schematically shows Figure 1 and Figure 2 A cutaway view of a detail of an outboard drive;

[0037] Figure 7 schematically illustrates a side view of an outboard drive according to another embodiment; and

[0038] Figure 8 A side view of an outboard drive according to another embodiment is schematically shown. DETAILED DESCRIPTION

[0039] Advantageous embodiments are described below with reference to the drawings. Identical, similar or identically acting elements are provided with the same reference numerals in different figures, and a repeated description of these elements is partially omitted in order to avoid redundancy.

[0040] exist Figure 1 Schematically a sectional view through a schematically indicated ship 100 is shown. An outboard drive 1 is fastened to a transverse beam 101 of the ship 100. For this purpose, the outboard drive 1 comprises a fastening unit 7. The outboard drive 1 also comprises a drive unit 3 in this pod-like manner, which has a propeller 5 rotatable about a propeller axis 4 and which is arranged below the waterline 110, i.e., under water.

[0041] The drive unit 3 is fastened to a shaft 10 which is rotatably arranged on a mounting unit 7 about a steering angle rotation axis 6. The shaft 10 is connected in a rotationally fixed manner to a steering device 8 arranged on the mounting unit 7, which comprises a rudder 9. The steering angle of the drive unit 3 can thus be preset via the position of the steering device 8.

[0042] A streamlined, thin-walled shaft profile 11 is arranged around the shaft 10 .

[0043] Figure 2 Schematically shows Figure 1 1. A cylindrical shaft 10 extending in the interior of the outboard drive 1 is indicated by means of a dashed line. A shaft profile 11 encloses the shaft 10 between the fastening unit 7 and the drive unit 3, which is designed here as a crossbeam bracket.

[0044] The shaft profile 11 extends along its longitudinal axis 12 which, in the properly assembled state of the outboard drive 1 , corresponds to the steering angle rotational axis 6 or coincides with the latter.

[0045] With respect to the longitudinal axis 12, the shaft profile 11 has at its end faces connections 13, one for the fastening unit 7 and one for the drive unit 3. According to the alternative embodiment, the connection 13 for the fastening unit is made of a hard, i.e. non-elastic plastic, while the connection 13 for the drive unit 3 is an elastic connection 13.

[0046] Figure 3Schematically shows Figure 1 and Figure 2 A perspective view of the shaft profile 11 of the outboard drive 1 .

[0047] It can be seen here that the shaft profile 11 comprises a main body 15 which extends along a longitudinal axis 12 and in which a receiving space 19 is provided for receiving the shaft 10 of the outboard drive 1 .

[0048] The base body 15 has exactly one chamber 17 , wherein the receiving space 19 is formed in exactly one chamber 17 .

[0049] The base body 15 comprises an outer wall 18 of a predetermined wall thickness 21 which is closed in the circumferential direction with respect to the longitudinal axis 12 (see Figure 4 ), which, viewed perpendicularly to the longitudinal axis 12 , encloses exactly one chamber 17 .

[0050] Three supporting ribs 16 extending in the direction of the longitudinal axis 12 are provided on the inner side 22 of the receiving chamber 19 for radially guiding the shaft 10. The supporting ribs 16 protrude radially inwards from the inner side 22 of the outer wall 18 with respect to the longitudinal axis 12, more precisely in such a way that their free ends 20 lie on a common pitch circle diameter with respect to the longitudinal axis 12, which substantially corresponds to the outer diameter of the shaft 10. As a result, a three-point guidance of the shaft 10 on the shaft profile 11 or vice versa is formed with respect to a cross section perpendicular to the longitudinal axis 12. Each of the supporting ribs 16 respectively provides a linear guidance of the shaft 10 in the direction of the longitudinal axis 12.

[0051] The base body 15 is a one-piece extruded profile made of an aluminum alloy.

[0052] The shaft profile 11 , more precisely the base body 15 , viewed perpendicularly to the longitudinal axis 12 , has a cross-sectional outer contour which is designed to be streamlined in a transverse direction 14 oriented perpendicularly to the longitudinal axis 12 and which, in the assembled state of the outboard drive 1 , is oriented parallel to the propeller axis 4 .

[0053] Figure 4 Shows penetration Figure 3 1 is a cross-sectional view of the base body 15 of the shaft profile 11 perpendicular to the longitudinal axis 12. It can be seen from this that the support ribs 16 are arranged uniformly distributed in the circumferential direction with respect to the longitudinal axis 12 according to the optional embodiment, but are not limited to uniform distribution. Since three support ribs are provided here, the angle between adjacent support ribs is 120°.

[0054] At its free end 20 pointing radially inward, each support rib 16 has a rounded shape. Here, the free end 20 is curved convexly, that is, curved outward. As a result, the contact surface between the shaft 10 and the support rib 16 is minimized.

[0055] Furthermore, the streamlined teardrop shape of the base body 15 can be seen.

[0056] Figure 5 FIG. 1 shows a section through a base body 15 of a shaft profile 11 according to another embodiment, perpendicular to the longitudinal axis 12 . The shaft profile 11 corresponds essentially to Figure 4 10, wherein the free ends 20 of the support ribs 16 are concave, ie, curved inwardly. Here, the curvature of the concave curvature corresponds to the radius of the outer side of the cylindrical shaft 10.

[0057] Figure 6 Schematically showing the penetration Figures 1 to 4 Detailed sectional view of the outboard drive 1 in the joining region between the shaft 10 , the shaft profile 11 and the drive unit 3 .

[0058] It can be seen that the shaft 10 comprises a toothing 25 at its lower end, by means of which it engages in a matching toothing 26 on the drive unit 3 in order to be able to transmit a torque about the longitudinal axis 12 , ie about the steering angle rotational axis 6 .

[0059] The drive unit 3 comprises a projection 27 which, as in the present case, extends in the direction of the longitudinal axis 12 into the chamber 11 at a distance from the longitudinal axis 12. The projection 27 can transmit a torque between the drive unit 3 and the shaft profile 11.

[0060] The shaft 10 and the shaft profile 11 are therefore connected to one another in a rotationally fixed manner in the assembled state of the outboard drive 1. Alternatively or additionally, the shaft 10 and the shaft profile 11 can also be directly connected to one another in a rotationally fixed manner.

[0061] The elastic connection 13 can optionally form, so to speak, a seal of the chamber 11 against the penetration of water.

[0062] according to Figure 1 and Figure 2 The outboard drive 1 is configured to be switchable between a normal mode and a standby rudder mode.

[0063] In normal mode, outboard drive 1 includes Figures 1 to 4 In the spare rudder mode, the shaft profile 11 is replaced by another shaft profile 11.

[0064] Figure 7 Show according to Figure 1 Side view of an outboard drive 1, wherein instead of the shaft profile 11, which is a first shaft profile 11 having a first length in a transverse direction 14 oriented transversely to the longitudinal axis 12, a second shaft profile 11' is inserted, which has a second length 31 in the transverse direction 14 that is different from the first length.

[0065] The shaft profile 11 ′, more precisely its base body 15 , comprises a spare rudder section 30 for providing a spare rudder for a boat 100 comprising an outboard drive 1 .

[0066] The spare rudder section 30 comprises a length 31 in the transverse direction 14 which is smaller than Figures 2 to 4 The length of the shaft 11 is greater than a predetermined value 32 and is also greater than the length 33 of the connection section 28 of the drive unit 3 and the shaft profile 11, 11'. Thus, when a rotation angle not equal to 0° is set, a torque can be generated by the shaft profile 11' from the water flowing around the shaft profile, which is high enough to be able to control the ship at least initially.

[0067] In this case, the reserve rudder section 30 extends over the entire base body 15 , viewed in the direction of the longitudinal axis 12 , ie over its entire length in the direction of the longitudinal axis.

[0068] A reduction 34 is provided between the lower end face of the base body 15 and the connection section 28 to compensate for the different lengths 31, 33. The reduction 34 is designed to connect the shaft profile 11' and the drive unit 3, more precisely the connection section 28, to one another in a rotationally fixed manner so that a torque can be transmitted about the longitudinal axis 12 corresponding to the steering angle rotation axis 6.

[0069] A reduction 34 (not shown here) can also be provided on the upper side of the shaft profile 11 ′, which can provide a transition from the upper end side of the shaft profile 11 ′ to the elastic connection 13 (see Figure 2 ).

[0070] Alternatively, the spare rudder segment 30 may extend in the direction of the longitudinal axis 12 only over a portion of the basic body 15 .

[0071] Figure 8 Show according to Figure 1 and Figure 7 1 , in which a third shaft profile 11 ″ is inserted instead of the shaft profiles 11 , 11 ′.

[0072] The shaft profile 11 ″ comprises a multi-piece base body 15 assembled from two base body parts 41 , 42 . Each of the base body parts 41 , 42 can be considered as a base body. Therefore, the shaft profile 11 ″ can be considered as comprising two base bodies ( 41 , 42 ). The upper first base part 41 is similar to Figure 2 The base 15 of the shaft 11 in the middle has a length 35 in the transverse direction 14. The lower second base part 42 is similar to Figure 7 The shaft profile 11 ′ in FIG. 4 has a length 31 in the transverse direction 14 . The spare rudder section 30 is thus formed at the second basic part 42 .

[0073] It can be seen that the second base part 42 is in the state in which the outboard drive 1 is properly fastened on the boat 100 (see Figure 1 ) is present below the waterline 110. Correspondingly, the spare rudder section 30 is formed only below the waterline 110. The spare rudder section 30 therefore extends in the direction of the longitudinal axis 12 only over the area of ​​a part of the shaft profile 11 ″.

[0074] A reduction 34 which connects the aforementioned parts in a rotationally fixed manner and / or seals against water infiltration may be provided between the base parts 41, 42. Furthermore, a reduction 34 which provides a rotationally fixed connection and / or seals against water infiltration may be provided between the drive unit 3 and the second base part 42, and / or another reduction which is not shown here and which is optionally sealed against water infiltration may be provided at the upper end side of the first base part 41.

[0075] As far as applicable, all individual features shown in the exemplary embodiments may be combined with one another and / or exchanged without departing from the scope of the present invention.

[0076] Reference numerals list

[0077] 1 Outboard drive

[0078] 3 Drivers

[0079] 4 Propeller shaft

[0080] 5 Propellers

[0081] 6 Steering angle - axis of rotation

[0082] 7 Fastening unit

[0083] 8 Steering device

[0084] 9 rudder

[0085] 10 axis

[0086] 11-axis profile

[0087] 12 Vertical axis

[0088] 13Connection

[0089] 14Horizontal direction

[0090] 15 Matrix

[0091] 16 Support ribs

[0092] 17 Chambers

[0093] 18 outer wall

[0094] 19 Accommodation cavity

[0095] 20 Free end

[0096] 21 Wall thickness

[0097] 22Inside

[0098] 25 teeth

[0099] 26 teeth

[0100] 27 Protrusion

[0101] 28 joint section

[0102] 30 spare rudder sections

[0103] 31 Length of spare rudder section

[0104] 32 Numeric

[0105] 33 Length of the joint section

[0106] 34 Reduction Department

[0107] 35 first length

[0108] 41 first base part

[0109] 42 second base part

[0110] 100 ships

[0111] 101 beam

[0112] 110 Waterline

Claims

1. A shaft profile (11, 11', 11") for an outboard drive (1) for driving a boat (100), the shaft profile comprising a base body (15) extending along a longitudinal axis (12), wherein the base body (15) has a receiving cavity (19) for receiving a shaft (10) of the outboard drive (1), It is characterized in that At least three supporting ribs (16) extending in the direction of the longitudinal axis (12) are arranged on the inner side (22) of the accommodating cavity (19) for radially guiding the shaft (10).

2. The shaft profile (11, 11', 11") according to claim 1, It is characterized in that The supporting rib (16) has a rounded shape at its free end (20) pointing radially inwards, wherein the free end (20) has, for example, a concave or convex curvature.

3. A shaft profile (11, 11', 11") according to claim 1 or 2, It is characterized in that The base body (15) has exactly one chamber (17), wherein the receiving cavity (19) is formed in the exactly one chamber (17), wherein the base body (15) optionally includes a closed outer wall (18) of a predetermined wall thickness (21) in the circumferential direction with respect to the longitudinal axis (12), and the outer wall encloses the exactly one chamber (17) when viewed perpendicularly to the longitudinal axis (12).

4. A shaft profile (11, 11', 11") according to any one of the preceding claims, It is characterized in that The base body (15) is designed at at least one of its end sides to be connected in a rotationally fixed manner with respect to the longitudinal axis (12) to a component of the outboard drive (1) arranged at this end side, the component being, for example, a drive unit (3) of the outboard drive (1), for example a drive unit (3) in the form of a pod unit.

5. A shaft profile (11, 11', 11") according to any one of the preceding claims, It is characterized in that A connection (13), for example an elastic connection (13), is provided at at least one of the end sides of the shaft profile (11, 11', 11") with respect to the longitudinal axis (12) for optionally elastically connecting the shaft profile (11, 11', 11") to a component of the outboard drive (1) arranged at this end side, Optionally, the connecting portion (13) provides a sealing portion for the shaft profile (11, 11', 11").

6. A shaft profile (11, 11', 11") according to any one of the preceding claims, It is characterized in that The shaft profile (11, 11', 11") has a cross-sectional outer contour when viewed perpendicularly to the longitudinal axis (12), which is designed to be streamlined in a predetermined transverse direction (14), wherein the cross-sectional outer contour is designed to be teardrop-shaped, for example.

7. Axle profile (11, 11', 11") according to any one of the preceding claims, It is characterized in that The base body (15) is designed in one piece and / or the base body (15) is an extruded profile, a continuously cast profile or a continuously pressed profile.

8. A shaft profile (11, 11', 11") according to any one of the preceding claims, It is characterized in that The shaft profile (11, 11', 11") comprises a spare rudder section (30) for providing a spare rudder for a boat (100) comprising the outboard drive (1), wherein in the spare rudder section (30), the shaft profile (11, 11', 11") has a preset length (31), wherein optionally, in the spare rudder section (30), the length (31) of the shaft profile (11, 11', 11"), for example of the base body (15) in the transverse direction (14) is greater than the length (33) of a coupling section (28) of a drive unit (3) of the outboard drive (1), for example of a pod unit.

9. Axle profile (11, 11', 11") according to the preceding claim, It is characterized in that The spare rudder segment (30) extends in the direction of the longitudinal axis (12) within the scope of the entire shaft profile (11, 11', 11"), optionally within the scope of the entire base (15), or the spare rudder segment (30) extends in the direction of the longitudinal axis (12) within the scope of the shaft profile (11, 11', 11"), optionally within the scope of a part of the base (15), and / or the base (15) is composed of a plurality of base parts (41, 42), wherein at least one base part (41, 42) includes the spare rudder segment (30).

10. An outboard drive (1) for a boat (100), comprising a fastening device (7) for fastening the outboard drive (1) to the boat (100), and a drive unit (3) which is arranged rotatably about a steering angle-rotation axis (6) at the fastening device (7) via a shaft (10), It is characterized in that Between the fastening unit (7) and the drive unit (3), a shaft profile (11, 11', 11") according to any of the above claims is arranged at the shaft (10) and / or the outboard drive (3) is configured for switching between a normal mode and a standby rudder mode.

11. Outboard drive (1) according to the preceding claim, It is characterized in that In the normal mode, a first shaft profile (11, 11', 11") having a first length (35) is arranged at the shaft (10) between the fastening unit (7) and the drive unit (3) in the direction of a transverse direction (14) oriented transversely to the steering angle-rotation axis (6), and in the standby rudder mode, a second shaft profile (11, 11', 11") having a second length (31) different from the first length (35) is arranged at the shaft (10) between the fastening unit (7) and the drive unit (3) in the direction of the transverse direction (12).

12. Outboard drive (1) according to any of the two preceding claims, It is characterized in that The outboard drive (3) is designed so that the shaft profile (11, 11', 11") can be replaced, wherein, for example, a first shaft profile (11, 11', 11") has a first length (35) in the direction of a transverse direction (14) oriented transversely to the steering angle rotation axis (6), and a second shaft profile (11, 11', 11") has a second length (31) different from the first length (35).

Images