FR2812270A1 - Ship's rudder has leading and trailing edge vanes controlled by a drive operating through a spindle bearing and gear mechanism - Google Patents

Abstract

The rudder consists of a main section (2) suspended beneath the hull of a craft so it can be rotated, and at least one leading or trailing edge vane (19, 21), turned by means of a gear mechanism and spindle bearings with cylindrical or tapered rollers. The gear mechanism has a series of gears on a hoop (5) and a drum (7) surrounding the main rudder shaft (3). The leading edge vane is fastened to the main rudder section by a step bearing (23), while the trailing edge vane is connected to it by hinges (24).

Description

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  The present invention relates to a rudder for a boat and relates in particular to such a rudder consisting of a main rudder on the front and rear edges of which are

mounted two pivoting shutters.

  It is known that giving curvature to a profile considerably increases the force generated by a bearing plane in a fluid flow. This increase in curvature can be obtained by the deflection of a trailing edge flap relative to the rest of the profile or by the deflection of a leading edge flap relative to the rest of the profile or by the action combined holdings of a leading edge flap and a leading edge flap

  leak from the central part of the profile.

  There are already rudders whose rear flap is mobile and / or whose leading edge is either fixed or mobile; this result is obtained by a fixing, rods or other gears using a fixed pivot point on the shell separate from the drill bit or the bearing

  and thereby outside the rudder.

  However, the state of the prior art shows no use of the rotational movement of the roller cage of a roller bearing to actuate one or two pivoting flaps. This is accomplished mechanically without having to use an anchor point outside the rudder which disturbs the flow and creates turbulence which can favor

ventilation phenomena.

  The present invention relates to a boat rudder comprising a main rudder mounted for rotation on the structure of the hull and two pivoting flaps, one on the

  front edge and the other on the rear edge of this main rudder.

  The pivoting flap located on the front edge of this main rudder rotates around the same vertical axis as the main rudder and is held by a mechanical link located on the same axis of this main rudder as well as by an axis parallel to the axis of the rudder bit in the upper front part of this same flap. The rear part of this shutter

  front has a recess of horizontal U-shaped section which conforms to the semi-shaped

  cylindrical rudder bit and which therefore prevents the flap from escaping from the main rudder during the rotational movements imposed on it around the axis of the rudder. The pivoting flap located on the rear edge of this main rudder is pivotally mounted on the main rudder along its rear edge. The front part of this front flap has a semi-cylindrical shape which matches a section recess

  horizontal in U located on the rear edge of the main rudder.

  One of the aims of the present invention is to produce a rudder for a boat provided with one or two flaps comprising a reduced number of elements in order to simplify the

  manufacturing, minimize production costs.

  Another object of the invention is to produce such a rudder comprising a reliable shutter control mechanism and which can be easily assembled thanks to the use of a bearing cage of relatively small size compared to the size of the

rudder whatever its size.

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  Another object of the present invention is to produce such a rudder comprising a compact mechanism integral with the rudder making any removal work as simple as

  if it was a traditional suspended rudder.

  Another object of the present invention is to provide such a rudder comprising a mechanism which does not include any protuberance or protuberance made necessary for technical reasons which therefore do not interfere with the flow of the fluid. One embodiment of the present invention is described below by way of example with reference to the accompanying drawings in which: - Figure 1 is a side elevational view showing the rudder according to the

present invention.

  - Figure 2 is a plan view of the rudder according to the present invention.

  - Figure 3 is a plan view along line AA 'of Figure 1.

  - Figure 4 is a plan view along line BB 'of Figure 1.

  - Figure 5 is a plan view illustrating the operation of the rudder of the

figure 1.

  In Figure 1 we see a rudder (1) according to the present invention, comprising a main rudder (2) rotatably mounted on the hull via a rudder bit (3). The main rudder hangs from the hull. The rudder bit is in the hull (4) secured to a hoop (5) concentric with the axis of rotation of this main rudder. The upper end of the hoop consists of a gear (6) forming the entire periphery thereof. The hoop turns in a drum (7) from which it is separated by a cylindrical roller bearing (8) consisting of a set of rollers (9) held together and at a distance from each other by a cage (10). The rollers of the rolling cage rest on the entire surface of the hoop located below the gear. The upper inner part of the drum containing the hoop and its bearing consists of a gear (11) which is opposite the gear of the hoop. Similarly, the rollers of the cylindrical roller bearing rest on the entire surface of the drum located in

below the gear.

  The drum transmits its load to the structure of the boat by direct contact between an outer jacket of the drum of doubly truncated spherical shape and the same negative shape in the hull. This combination of spherical reach allows the drum to accommodate the

  movements due to bending of the wick.

  Two stops (12) fixed on the front and rear parts of the drum are housed in two small reservations (13) in the hull structure and prevent the rotation of the drum during the rotation of the rudder. The cage holding the rollers of the bearing has two diametrically opposite recesses in its upper part in which are housed respectively a gear (14 and 15) mounted on an axis (16 and 17) parallel to the axis of rotation of the rudder. These gears are in direct opposite with the gears located one on the hoop and the other on the drum in such a way that any movement of rotation of the hoop around the axis of rotation of the rudder causes their rotation as both

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  sattelite gears in a train of planetary gears. The rollers of the rolling cage undergo the same rotational movement as the small gears (14 and 15) of the rolling cage. The two axes (16 and 17) supporting these two gears pass through the bearing cage from top to bottom and protrude from its lower part The axle (16) supporting the front gear enters a ball joint (18) located on the upper face of the front movable flap (19) controlling the rotation of the latter around the rudder axis during the rotation of the hoop resulting from the rudder rotation. The axis (17) supporting the small rear gear enters the end eye of a slide (20) which is housed in the upper part of the rear movable flap (21). This slide and the axis exiting the bearing take place in a U-shaped rebate (22) located on the upper part of the main rudder (2) behind the drill bit. rudder (3). nt (19) is fixed to the main rudder (2) in its lower part by a crapaudine (23). The rear movable flap (21) is fixed to the main rudder by hinges (24) According to a particular embodiment of the invention, only the mechanism for turning the leading edge is used. Another particular embodiment of the invention only presents a

  trailing edge turning mechanism.

  Another variant of the rudder has a tapered roller bearing.

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Claims (5)

  1. Rudder for a boat comprising a main rudder (2) suspended in rotation from the hull, and at least one leading edge flap (19) or a trailing edge flap (21) movable relative to the main rudder, characterized in that it comprises in the hull at the root of the rudder a cylindrical roller bearing (8) located between a hoop (5) of wick (3) and a drum (7) locked in rotation relative to the hull whose cage (10) of the rollers (9) while being controlled in its rotation by gears (14 and) meshing with a gear located on the hoop (6) and a gear located on the wall of the drum (11) drives in the rotation resulting from the rotation of the rudder two axes (16 and 17) which can cause for one (16) the leading edge flap (19) and which for the other   can serve as an anchor for a steering mechanism of the trailing edge flap (21).   2. Rudder according to claim 1, characterized in that the rudder has only one movable leading edge flap relative to the main rudder and trailing edge which form a single element.   3. Rudder according to claim 1, characterized in that the rudder has only one movable trailing edge flap relative to the main rudder and leading edge which form a single element.   4. Rudder according to claim 1, characterized in that the rudder has a leading edge flap and a trailing edge flap movable relative to the main rudder. 5. Rudder according to claim 1, characterized in that the bearing used is a tapered roller bearing.