Marine drive thread mounted pinion

Posted by Fun ka maza on 21:39 with No comments
Marine drive thread mounted pinion

Abstract
Apparatus pinion drive gear thread (2) for a unit of marine lower gearbox (4) includes a pinion gear (12) thread-mounted on the lower end of a vertical drive shaft (10) for driving rotatable driven gears (14 and 16) to drive a propeller shaft (6).

Description
Technical Field
The invention relates to the driving gear for a pinion gear box unit marine bottom.
BACKGROUND

A gearbox unit sea bottom, a drive gear bevel pinion is typically bolted to the underside of a toothed shaft, for example, as shown in U.S. Patent N Croissant. No. 3,931,783, and Croissant et al. U.S. Patent. No. 4223773.
DISCLOSURE OF INVENTION

A pinion gear is mounted in the lower thread of a drive shaft and drives a propeller shaft in a drive gear box marine bottom. A clutch dedicated load force is applied in a direction upwards along the axis of the drive shaft to push the pinion gear for a thread tight conditions. The benefits include increased rigidity against bending of the drive shaft due to the larger diameter provided, and reduced manufacturing cost.
BRIEF DESCRIPTION OF THE DRAWINGS

. Figure 1 is a schematic partial sectional view of an apparatus pinion drive gear mounted for a unit thread lower gearbox marine constructed according to the invention.
BEST MODE FOR CARRYING OUT THE INVENTION
Pinion gear apparatus 2 for a threaded drive gear box 4 includes a lower marine propeller shaft 6 rotatably mounted in the gearbox to produce thrust for propulsion, so it can be more Reference to the Croissant et al. U.S. Patent. No. 4,223,773, U.S. Croissant Pat. No. 3,931,783 and U.S. Kiekhaefer Pat. No. 2630775. Drive gear means 8 units of the propeller shaft. A drive shaft 10 extends vertically downward into the gearbox and is rotatable about a vertical axis substantially orthogonal to the propeller shaft 6. Or bevel drive pinion gear 12 is mounted in the lower thread of the drive shaft and the driven gear drives means rotating concentric with the propeller shaft for driving the latter. The gears 14 and 16 are engaged by sprocket 12 and driven in opposite directions rotate concentrically around the shaft 6, to provide rotation to the left or right hand rotation of the forward or reverse direction.Clutch means 18 is connected to propeller shaft 6 and radially movable away therefrom to engage the inner facing surfaces 20 and 22 concentric driven gears 14 and 16 in a direction of load application upwarding force along the axis the drive shaft 10 to bias the pinion gear 12 to a thread tight conditions. The bottom of the drive shaft 10 is wrapped around its outer periphery 24 for engaging with internal threads 26 concentric pinion gear 12.One or more bearings support the drive shaft 10 and carry radial and axial loads. A medium such as a sleeve, a needle bearing or ball bearing can bear radial load and a second separate bearing can carry axial load. In the preferred form a thrust bearing has two charges. Thrust bearing means 28 is mounted between an upper shoulder 30 on the pinion gear 12 and a seat 32 adjacent the gearbox drive shaft 10. Thrust bearings 28 are tapered roller bearings have an inner ring 34 with an upper end 36 hiring a downward facing seat 38 on the shaft 10, and a lower end 40 of the top 30 participation pinion 12. The tapered roller bearing has an outer race 42 downward facing coupling seat 32 in the gearbox. Drive shaft 10 has one or more reductions in diameter step at its lower end. The first step reduced diameter section 44 carries inner ring 34 of the thrust bearing tapered roller means 28. The second step further reduced diameter section 24 is threaded and threadably coupled mounted pinion 12.Clutch 18 is a wrapped spring clutch, as shown in "Helicopter Design Guide wheel drive", Sikorsky Aircraft, a division of United Technologies Corp., North Main St., Stratford, Connecticut, USA Army Air Mobility Research and Development Laboratories, Fort Eustis, 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 Schimanckas. No. 3608684. A first part of the clutch face 46 is aligned radially between the propeller shaft 6 and the first driven gear 14 and movable radially outward from the propeller shaft to engage the inner surface 20 concentric face gear 14. Second part of the clutch face 48 is aligned radially between the propeller shaft 6 and the second driven gear 16 and movable radially outward from the propeller shaft to engage the coated surface 22 concentric internal gear 16. Clutch 18 in its central portion is mounted on the propeller shaft 6 by splines 60 and the radial pins 50 retained in an annular groove recessed by a coil spring 52, as shown in said Croissant et al. U.S. Patent. No. 4223773.The control means 54 is movable axially along the propeller shaft between the first and second positions, left and right for driving the propeller shaft 6 rotating in opposite directions. In the first position to the left, the control means 54 of the first cam face 46 on the cam clutch 56 in engagement with the first driven gear 14 to drive the propeller shaft 6 in a direction of rotation. In the second position, to the right, the control means 54 of the second cam face 48 on the cam clutch 58 into engagement with the second driven gear 16 to drive the propeller shaft 6 in the direction opposite to the rotation. Clutch 18 is fixed for rotation about the axis 6 by pins 50 and grooves 60 and fixed against axial movement along the axis 6 by pins 50.The control means 54 includes an inner axial control shaft 62 can slide axially within the shaft 6. Left cam 58 is connected to the control shaft 62 inside the radial pin 64 which extends through the opening 66 in the propeller shaft and retained in an annular groove recessed cam 58 by the coil spring 68. Cam 56 includes a coupler 70 which is connected to internal control shaft 62 by pin 72 extending radially through the aperture 74 in the propeller shaft and retained in an annular groove recessed into the coupler 70 by the coil spring 76. Coupler 70 is a spool-like portion having a central section 78 between large diametered end sections 80 and 82.Operator controlled shift linkage 84 is operatively connected to the coupler 70 to move inside the control shaft 62 axially to the right or left on the propeller shaft. The operator controls stem 86 extends downwardly into the gearbox and is connected at its lower end to a yoke arm lever 88 a toggle lever 84 hinged at point 85. The crank has a second lever arm 90 with fork freely participate coupler spaced teeth 70 around the center section 78 between the ends 80 and 82 to allow the latch 70 and the control shaft 62 to rotate inside between the teeth during operation of the propeller shaft.Operator actuated downward movement of the stem 86 moves down the lever arm 88 which pivots bell crank 84 clockwise about the pivot point 85 which moves the lever arm 90 clockwise. The lever arm 90 engages the section 82 of the coupler 70 to move the coupler 70 and cam 56 axially to the left along the propeller shaft 6, so that the cam portion 56 engages the clutch face 46 to press the latter into engagement with the gear 14 along the face of friction coupling surface 20 to impart rotation of the gear 14 to the propeller shaft through the clutch 6. Leftward axial movement of the coupler 70 pin 72 also moves leftward in the opening 74 which moves inside the control shaft 62 to the left moves to the left pin 64 in opening 66 which in turn moving the cam 58 axially to the left of the clutch face 48 to avoid the partial participation of the latter against the gear 16 on the surface 22. Rightward movement of the control means 54 is comparable in response to upward movement of the stem 86.92 Tapered roller bearings carry axial thrust of the propeller shaft in one direction, and 94 tapered roller bearings carry axial thrust on the outside. Centered retaining means 96, a neutral position and includes tactile spring means extending radially through slots in the drive shaft between the control shaft 62 and the inner cam 56, with spring-biased ball 98 in the respective annular grooves the shaft 62 and the cam 56, radially compressed during left-right axial movement of the control shaft 62 inside.

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