Marine drive expanding clutch

Posted by Fun ka maza on 11:53 with No comments
Marine drive expanding clutch

Abstract
Clutch apparatus (2) for a gearbox unit sea bottom (4) includes a wrap spring clutch (18) mounted on a propeller shaft (6) for coupling the drive gear means (8) for actuating the propeller shaft. The clutch is radially expandable to engage the drive gear along a friction coupling surface axially extending face.

Description
DESCRIPTION
1. Technical Field
The invention relates to an apparatus for gripping the gearbox lower marine drive.
Two. Background

In Croissant et al. U.S. Patent. Croissant No. 4,223,773 and U.S. Pat. No. 3931783, a toothed gear clutch is movable axially along a helical axis in engagement with the forward gears and reverse gear, for driving the propeller shaft.
DISCLOSURE OF INVENTION
A clutch is provided which is movable to engage a gear drive on one side of the friction engagement surface extending axially. A wrapped spring clutch is expandable radially outwardly into engagement with a concentric drive gear.
BRIEF DESCRIPTION OF THE DRAWINGS
. Figure 1 is a partial sectional view of the clutch apparatus for a unit of marine lower gearbox constructed according to the invention.
BEST MODE FOR CARRYING OUT THE INVENTION
Apparatus 2 Clutch for a drive gearbox lower marine 4 includes a six propeller shaft rotatably mounted in the gearbox to produce thrust for propulsion, so you can still refer to croissant et al. U.S. Patent. Croissant No. 4,223,773 and U.S. Pat. No. 3,931,783, incorporated herein by reference. Drive gear means 8 drives the gearbox propeller shaft 6. A vertical drive shaft 10 has a bevel drive gear 12 at its lower end which engages and drives a pair of driven gears 14 and 16 in opposite directions of rotation concentrically about the propeller shaft 6. A spring wrapped clutch 18, for example, as shown in "Helicopter Wheel Drive Design Guide", Sikorsky Aircraft, a unit of United Technologies Corp., North Main St., Stratford, Conn. Army Air Mobility Research and Development Laboratories, Fort Eusties, Virginia, USAAMRDL-TR-77-18, October 1977, particularly pages 14, 16 and 56, and for further reference Irgens et al. U.S. Patent. No. 2,959,986 and U.S. Patent n Shimanckas. No. 3,608,684, is mounted without rotating the propeller shaft 6 for engaging the reverse driven gear 14 or 16 of the drive means 8 for driving the propeller shaft 6. Wrapped clutch spring 18 is radially expandable to engage gear 14 or 16 along a friction surface of the engagement face 20 which extends axially or 22.Driven gears 14 and 16 are spaced axially along the propeller shaft 6. Wrapped spring clutch 18 is disposed radially between the drive shaft 6 and driven gears 14 and 16. Clutch 18 has a first portion 24 engageable with the inwardly facing surface 20 of the first driven gear 14. Clutch 18 has a second portion 26 engageable with the inwardly facing surface of the second driven gear 16. Clutch face portions 24 and 26 are normally separated from the surfaces of gears 20 and 22 with a clearance therebetween in neutral.The clutch control means 28 is axially movable between first and second positions for driving the propeller shaft 6 rotating in opposite directions. In a first position to the left of the control shaft 28, the first portion 24 is cammed clutch 30 in frictional engagement with the first driven gear 14 in the surface 20, for driving the propeller shaft 6 in a direction rotation. In the clockwise or second control position 28, the second portion 26 of the clutch 18 is cammed 32 in frictional engagement with the second driven gear 16 on the surface 22 to drive the propeller shaft 6 in the direction opposite to the rotation.The clutch control means 28 is axially movable along the drive shaft 6 by changing linkage 34, which in turn is moved by the operator controlling stem 36. Stem 36 extends downwardly within the gear box and at its lower end engages a fork lever arm 40 a toggle lever 42 hinged at point 44 above the propeller shaft and axially spaced gear drive means 8. Bell crank 42 has a second lever arm 46 with forked loosely spaced barbs engage a spool-like coupling 48 which is axially slidable along the outside of the propeller shaft 6 and which rotates between a spaced barbs forked lever arm 46 when operating the propeller shaft. Coupler 48 is connected by a pin 50 to an inner axial control shaft 52 can slide axially within the shaft 6. Cam 32 is connected by pin 54 to the other end of the control shaft 52 inside. Pins 50 and 54 extend through respective radial apertures 56 and 58 in the propeller shaft and are held in the annular grooves, respectively embedded in the coupler 48 and cam 32 by the respective coil springs 60 and 62, which may be springs as shown in this Croissant et al. patent. Clutch 18 is connected to propeller shaft 6 by splines 63 and radial pins 64 held by the coil spring 66. Cam 30 is an extension to the left of the coupler 48. 68 Tapered roller bearings carry axial thrust of the propeller shaft in one direction, and 70 tapered roller bearings carry axial thrust of the propeller shaft in the opposite axial direction. Thrust bearings 68 and 70 supporting the propeller shaft 6 irrespective of driven gears 14 and 16 are preloaded to each other to carry bi-directional thrust. Or conical pinion gear 12 is mounted to the bottom of threaded shaft 10, and the upward thrust on clutch 18 is performed by means of tapered roller bearings 72. 72 thrust bearings support the bevel drive gear and carries the load along the axis of the drive shaft 10 due to the force of the engaging surface of the clutch face.In response to downward movement of the stem 36, the lever arm 40 moves downward and the crank lever 42 pivots clockwise about the point 44 to move the lever arm 46 clockwise. Coupler 48 has a central section which receives loosely fork teeth 46, and having end portions of greater diameter 74 and 76. Leftward motion of the lever arm 46 engages the coupler 74 side coupler 48 for axially moving to the left, thus moving the cam 30 axially to the left along the propeller shaft 6 and in contact with the clutch portion 24 to press the latter against the driven gear 14 in the mating surface 20, to thereby drive the propeller shaft 6. Leftward motion of the coupler 48 also moves leftward pin 50 through the opening 56 to move thus control shaft 52 to the left inner moving left pin 54 which in turn slides the cam 32 axially to the left along the propeller shaft 6 away from engagement with the clutch portion 26 so that the latter is not pressed into engagement with the oppositely rotates the driven gear 16 on the surface 22. Right back axial movement of the control means 28 is comparable.Clutch face means 24 and 26 are movable radially into engagement with driven gears 14 and 16 of drive gear means 8. Clutch faces 24 and 26 are disposed radially between the propeller shaft 6 and driven gears 14 and 16, and move outwardly from the propeller shaft to engage the inner concentric facing surfaces 20 and 22 of the driven gears . The clutch means including control means movable axially along the propeller shaft 6 to cause the radial movement remarkable clutch faces 24 and 26. Clutch means includes cam surfaces 30 and 32 to translate the axial movement of the control means 28 in a radial movement of the clutch faces 24 and 26. The control means 28 extends along the axis of the helix and axially beyond the gear driving means 8. Operator controlled shift linkage means 34 is operatively connected to the control means through the coupler 48 axially spaced gear driving means 8.First cam 30 is concentric with the propeller shaft 6 of the adjacent first clutch face 24 and radially inwardly of the latter. First cam 30 is connected to internal control shaft 52 by pin 50 extending radially through the aperture 56 in the propeller shaft to the coupler 48 and cam 30. Cam 30 is movable along the propeller shaft 6 over a limited range of axial movement defined by the axial width of the opening 56. Second cam 32 is concentric with the propeller shaft 6 seconds from the adjacent face of the clutch 26 and radially inwards of the latter. Second cam 32 is connected to internal control shaft 52 by the radial pin 54 through the opening 58 in the propeller shaft. Cam 32 is movable along the axis of the propeller over a limited range of axial movement defined by the axial width of the opening 58.Centered retaining means 78 sets placed in a neutral central touch control clutch means 28 between the first and second positions indicated, left and right. Bias spring means 80 extends radially through an aperture 82 in the control shaft between the inner 52 and bears the first cam 30 and the propeller shaft. The elastic means, such as spring decompression balls are seated in annular grooves of the cam 30 and the control shaft 52 and compressed inside the left or right during axial movement of the shaft 52.

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