JPH09301277A - Double reversal propeller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a double reversal propeller in which material cost of an outer propeller shaft can be reduced. SOLUTION: A double reversal propeller has an outer propeller shaft 43 and an inner propeller shaft 44 arranged coaxial in the outer propeller shaft A recessed part 82 is formed in ring shaped in an outer surface of the outer propeller shaft and depth d of the recessed part is less than half of depth T1 of the outer propeller shaft. A part, which has an outer diameter D2 smaller than the outer diameter D1 of the outer propeller shaft in a part adjacent to the recessed part and has inner diameter substantially the same inner diameter of an inner diameter Di of the outer propeller shaft in a part where the recessed part is formed is formed in the outer propeller shaft. An engaging member 83 is fit in the recessed part and ring shaped parts 86, 87 are disposed in the front and rear of the engaging members.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a motor boat,
The present invention relates to a contra-rotating propeller propeller mounted on a ship such as a yacht or a fishing boat.

[0002]

2. Description of the Related Art Conventionally, a uniaxial propulsion machine is usually used in a ship, and a counter-rotating propeller propulsion machine is rare. However, in a planing boat, etc., even if the propeller is not completely submerged by adopting a double-reversal propeller propulsion machine, the propeller is arranged double, so that the wing of the propeller underwater is Securing an area has been conventionally studied. This contra-rotating propeller propulsion machine which has been conventionally studied will be described with reference to FIG. FIG. 5 is an enlarged cross-sectional view of a main part of a contra-rotating propeller propulsion device that has been conventionally studied.

A flange 02 is formed integrally with the outer propeller shaft 01 of the counter-rotating propeller propulsion machine.
The propelling force generated by a propeller (not shown) attached to the outer propeller shaft 01 is transmitted to and supported by the case 03 of the propulsion unit via the flange 02.

[0004]

By the way, the outer propeller shaft 01 is manufactured by cutting a member having a diameter substantially the same as that of the flange 02. Therefore, the portion other than the flange 02 needs to be largely cut, the material is wasted, and the material cost is increased. Further, when the outer propeller shaft 01 and the flange 02 are integrally formed, stress concentration occurs at the corner portion of the root of the flange 02.

The present invention is intended to solve the above problems, and to provide a counter-rotating propeller propulsion device which can reduce the material cost of the outer propeller shaft and is less likely to cause stress concentration. With the goal.

[0006]

A counter-rotating propeller propulsion machine (1) according to the present invention has an outer propeller shaft (1) extending in the front-rear direction and having a front propeller (21) attached to a rear end thereof. 43) and an inner propeller shaft (44) coaxially arranged inside the outer propeller shaft and having a rear side propeller (22) attached to a rear end thereof. In order to achieve the above object, a ring-shaped recess (82) is formed on the outer peripheral surface of the outer propeller shaft, and the depth (d) of this recess is formed.
Is less than or equal to half the thickness (T1) of the outer propeller shaft. Further, the outer diameter (D2) smaller than the outer diameter (D1) of the outer propeller shaft in the portion adjacent to the recess.
And the portion having the inner diameter (Di) of the outer propeller shaft in the portion where the recess is formed is formed in the outer propeller shaft. An engaging member (83) is fitted in the concave portion, and the engaging member is not completely buried in the concave portion but partially protrudes. The front ring-shaped part (86) is provided on the front side of the engaging member. )
However, a rear ring-shaped part (87) is arranged on the rear side of the engaging member.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Next, a first embodiment of a counter-rotating propeller propulsion machine according to the present invention will be described with reference to FIGS. FIG. 1 is a side view of an outboard motor as a contra-rotating propeller propulsion device. FIG. 2 is a sectional view of the lower portion of the outboard motor. FIG. 3 is an enlarged view of a main part of FIG.

In FIG. 1, an outboard motor 1 as a contra-rotating propeller propulsion device is provided with a mounting bracket 3 via a swivel shaft 2 and the like. By fixing the mounting bracket 3 to the stern of the small boat 6 such as a motor boat, the outboard motor 1 is attached to the small boat 6 so as to be rotatable in the left-right direction and the vertical direction.

The outboard motor 1 is covered with a housing composed of an upper cowling 8, a lower cowling 9, an upper casing 10 and a lower casing 11 in order from the upper side. Inside the upper cowling 8 and the lower cowling 9, an engine 14 shown by a broken line is stored. An output shaft of the engine 14 projects downward and is connected to a drive shaft 16 disposed inside the upper casing 10 and the lower casing 11, and a pair of front and rear propellers 21 are connected via a power transmission device 18 described later in detail. , 22 are rotationally driven. The power transmission device 18 is arranged in the lower casing 11 together with a forward / reverse switching mechanism 24, which will be described in detail later. Further, the forward / reverse switching mechanism 24 moves forward,
The shaft 26 is being switched between reverse and neutral.
It is operated by a lever (not shown) provided on the operation handle 27 of the outboard motor 1 or a lever (not shown) provided on a steering section (not shown) of the small boat 6 via a boat or a link.

Next, details of the power transmission device 18 and the forward / reverse switching mechanism 24 will be described with reference to FIGS. 2 and 3. The drive shaft 16 extends in a substantially vertical direction and is rotatably supported by the lower casing 11 and the like. A drive bevel gear 31 is fixed to the lower end of the drive shaft 16. A pair of front and rear passive bevel gears 32 and 33 mesh with the driving bevel gear 31,
The passive bevel gears 32 and 33 face each other. The front bevel gear 32 on the front side is a thrust bearing 34 which is arranged substantially perpendicular to the rotation axis of the bevel gear 32 for passive.
The bearing member 36 is provided with a radial bearing 35 that supports the radial force of the passive bevel gear 32. The thrust bearing 34 and the radial bearing 35 are needle bearings, and the bearing member 36 is fixed to the lower casing 11 which is a case.

On the other hand, the rear bevel gear 33 on the rear side has a first bearing member 38 having a thrust bearing 37 which is arranged substantially perpendicular to the rotation axis of the passive bevel gear 33,
And a second bearing member 40 having a radial bearing 39 for supporting the radial force of the passive bevel gear 33. The thrust bearing 37 as the thrust bearing portion and the radial bearing 39 as the radial bearing portion are needle bearings, and
The first bearing member 38 and the second bearing member 40 are fixed to the lower casing 11 via a cylindrical support case 41.

By the way, the propeller shaft 43 driven by the bevel gears 31, 32, 33 which are the power transmission device 18,
The reference numeral 44 includes two pipe-shaped outer propeller shafts 43, which will be described later in detail, and an inner propeller shaft 44 that is fitted coaxially inside the outer propeller shaft 43. The outer propeller shaft 43 is rotatably supported by the support case 41, while the inner propeller shaft 44 is rotatably supported by the outer propeller shaft 43 and the front passive bevel gear 32. The front propeller 21 is fixed to the rear end of the outer propeller shaft 43, while the rear end of the inner propeller shaft 44 projects rearward from the rear end of the outer propeller shaft 43, A rear propeller 22 is fixed to the portion.

The front end of the outer propeller shaft 43 projects through the rear passive bevel gear 33, and the rear dog clutch 45 for the outer propeller shaft 43 is spline-fitted, that is, integrated with the front end portion. It is mounted so that it can rotate and is slidable in the axial direction. The passive bevel gear 33 and the outer propeller shaft 43 are configured to be rotatable. In this way, the tubular rear dog clutch 45 is arranged between the front and rear passive bevel gears 32 and 33, and the front and rear ends of the dog clutch 45 are provided with the pawls 45a and 45b, respectively. Has been formed. Then, when the dog clutch 45 on the rear side slides to the front side, the pawl 45a on the front side causes the pawl 32 of the passive bevel gear 32 on the front side to move.
When the rear dog clutch 45 slides rearward, the rear claw 45b engages the claw 33a of the rear passive bevel gear 33.

The front end of the inner propeller shaft 44 is
It projects forward from the front end of the outer propeller shaft 43, penetrates the front bevel gear 32 on the front side, and projects further forward. A front dog clutch 47 for the inner propeller shaft 44 is spline-fitted to the front end portion of the inner propeller shaft 44. The passive bevel gear 32 on the front side and the inner propeller shaft 44 are configured to be rotatable. A claw 47a is formed at the rear end of the tubular front dog clutch 47.
When is slid rearward, the pawl 47a engages with the front pawl 32b formed at the front end of the front passive bevel gear 32. The dog clutches 45 and 47 form the forward / reverse switching mechanism 24.

A ring-shaped engagement groove 49 is formed on the peripheral surface of the front dog clutch 47, and the engagement groove 49, which is the engagement portion, is provided in the operation portion 5 of the shift lever 51.
2 is fitted. The shift lever 51, which is the shift member, is rotatably attached to the protruding portion of the bearing member 36, and the end portion of the shift lever 51 is engaged with the shaft 26. Then, when an operation lever (not shown) is operated, the shaft 26 moves up and down, and accordingly, the shift lever 51 rotates and the shift lever 5 moves.
The first operating portion 52 is displaced in the front-rear direction. This operating part 52
The front dog clutch 47 moves back and forth due to the front and rear displacement.

The rear dog clutch 45 is constructed so as to interlock with the front dog clutch 47.
The structure will be described. A clutch cylinder 58 is disposed inside the inner propeller shaft 44 so as to be movable in the axial direction. The dog clutch 47 on the front side is a clutch tube 58.
Is connected to the front portion of the front side by a front side connecting pin 60, and a front long hole 44a is formed in the inner propeller shaft 44 so that the front side connecting pin 60 can be moved back and forth. A rear connecting pin 62 is attached to the rear portion of the clutch cylinder 58, and collars 63 are attached to both ends of the rear connecting pin 62. The connecting pin 62 is engaged with the dog clutch 45 on the rear side through the collar 63 and the pair of front and rear washers 64. The rear connecting pin 62 rotates together with the front dog clutch 47, the front connecting pin 60 and the clutch cylinder 58 together with the inner propeller shaft 44, while the rear dog clutch 45 together with the outer propeller shaft 43. Is rotating. Therefore, the rear connecting pin 62 and the rear dog clutch 45 are engaged with each other such that they can rotate relative to each other about the axes of the propeller shafts 43 and 44 and can be interlocked in the axial direction. . A rear long hole 44b is formed in the inner propeller shaft 44 so that the rear connecting pin 62 can move back and forth.

Further, a pair of front and rear pieces 67 is provided in the clutch cylinder 58, and a plurality of balls 70 are arranged between the pair of pieces 67. The pieces 67 are constantly urged by a spring 71, which is an urging means, so that the pieces 67 come close to each other, and press the ball 70 outward. By this pressing, the ball 70 can be engaged with the annular groove 73 formed on the inner surface of the inner propeller shaft 44.

In the neutral state shown in FIGS. 2 and 3, the claws 45a of the dog clutches 45 and 47,
45b and 47a are claws 32 of the bevel gears 32 and 33 for passive use.
The rotation of the drive shaft 16 is not transmitted to the propeller shafts 43 and 44. Therefore, the propulsive force is not applied to the small vessel 6. Further, the ball 70 is engaged with the groove 73, and the clutch cylinder 58 is prevented from moving in the axial direction by the ball 70. Therefore, the neutral state can be stably maintained.

From the neutral state in which the ball 70 is engaged with the groove 73, the shaft 26 is moved upward by applying a force to rotate the shift lever 51 clockwise, and the spring 71 is moved.
The ball 70 and the groove 73 are disengaged from each other against the biasing force of the shift lever 51 to move the operating portion 52 of the shift lever 51 forward. Along with that, the dog clutches 47, 45 move to the front side. The front pawl 45a of the rear dog clutch 45 engages with the pawl 32a of the front passive bevel gear 32, and the rotation of the drive shaft 16 causes the front passive bevel gear 32 and the rear dog clutch 45 to rotate. Is transmitted to the outer propeller shaft 43 via. Then, the front propeller 21 rotates, and the small boat 6 moves backward.

On the other hand, from the neutral state, the shaft 26 is moved by applying a downward force to rotate the shift lever 51 counterclockwise to release the engagement between the ball 70 and the groove 73,
The operating portion 52 of the shift lever 51 is moved to the rear side. Along with that, the dog clutches 47, 45 move to the rear side. Then, the claw 47a of the dog clutch 47 on the front side
Engages with the front pawl 32b of the front passive bevel gear 32, and also with the rear dog clutch 45 rear pawl 45b.
Engages with the pawl 33a of the rear-side passive bevel gear 33. Then, the rotation of the drive shaft 16 is transmitted to the inner propeller shaft 44 through the front-side passive bevel gear 32 and the front-side dog clutch 47, and the rear-passive bevel gear 33 and the rear-side dog clutch are transmitted. It is transmitted to the outer propeller shaft 43 via 45. Then, the pair of front and rear propellers 21 and 22 rotate in mutually opposite directions, and the small boat 6 advances. The front propeller 21 rotates in the direction opposite to that in reverse.

By the way, the inner diameter Di of the outer propeller shaft 43 is substantially uniform over the entire length except for the rear end portion of the outer propeller shaft 43. The inner diameter of the rear end portion of the outer propeller shaft 43 is formed to be larger than that of the other portion, and the inner propeller shaft 4 is formed in the rear end portion.
A bearing 76 for bearing 4 is provided. On the other hand, the outer diameter of the outer propeller shaft 43 is large in a portion having strength such as a bearing portion, and is small in a portion other than the bearing portion which does not require much strength for weight saving. That is, the outer propeller shaft 4
The outer diameter D1 of the outer propeller shaft 43 is formed to be large in a strong portion where the bearings 78, 79, 80 for bearing 3 are provided. On the other hand, the portion between the central bearing 79 and the rear bearing 80 that does not require much strength is the outer diameter D of the outer propeller shaft 43.
2 is formed small. Therefore, the thickness T1 of the portion having strength is larger than the thickness T2 of the portion that does not require much strength. The front bearing 78 is made of a metal bearing, and is arranged between the rear passive bevel gear 33 and the outer propeller shaft 43. The central bearing 79 and the rear bearing 80 are needle bearings, and are arranged between the support case 41, which is a member integrally fixed to the lower casing 11, and the outer propeller shaft 43.

A ring-shaped groove 82 is formed in the outer propeller shaft 43 along the circumferential direction between the front bearing 78 and the central bearing 79. In the embodiment shown in FIGS. 2 and 3, the depth d of the groove 82 that is the recess is 25% of the thickness T1 of the outer propeller shaft 43 at the portion adjacent to the groove 82, for example, at the front edge of the ring-shaped groove 82. It is a degree. And this value (d / T1)
Can be variously changed, but considering the strength of the outer propeller shaft 43 and the like, it is at least 50% or less, for example, about 10% to 50% (preferably 20% to 50%). The lower limit is determined in consideration of the minimum size of the groove 82 and the like.

A ring-shaped clip 83 is fitted in the ring-shaped groove 82. An outer portion of the clip 83 having a substantially circular cross section projects from the groove 82 having a substantially semicircular cross section. Ring plates 86 and 87, which are ring-shaped parts, are arranged so as to be fitted into the outer propeller shaft 43 on both front and rear sides of the clip 83 which is the engaging member, and the front ring plate 86 is arranged with respect to the outer propeller shaft 43. The rear end of the inner peripheral edge portion of the ring plate 86 is prevented from moving toward the rear side by engaging the clip 83.
Similarly, the ring plate 87 on the rear side is connected to the outer propeller shaft 43.
On the other hand, the front end of the inner peripheral edge of the ring plate 87 is prevented from moving to the front side by engaging the clip 83. The ring plates 86, 87 and the clip 83 constitute a member corresponding to the conventional flange 02 shown in FIG. The front side of the ring plate 86 on the front side and the second side
A front thrust roller bearing 90 is arranged between the bearing member 40 and a rear thrust roller bearing 91 is arranged between the rear side of the rear ring plate 87 and the support case 41. .

When the rear claw 45b of the rear dog clutch 45 is engaged with the claw 33a of the rear passive bevel gear 33, the forward propelling force of the front propeller 21 causes The outer propeller shaft 43 is pressed forward, but this pressing force is applied to the clip 83 and the ring plate 8 on the front side.
6, front thrust roller bearing 90 and second
It is transmitted to and supported by the support case 41 via the bearing member 40. On the other hand, the front claw 45a of the rear dog clutch 45
Is engaged with the pawl 32a of the front-side passive bevel gear 32, the outer propeller shaft 43 is pushed rearward by the rearward propelling force of the front propeller 21. 83, the rear side ring plate 87, and the rear side thrust roller bearing 91.
Supported by the transmission. In this way, the outer propeller shaft 43 is supported by the support case 41, which is a member integrally fixed to the lower casing 11. Since a force is applied to the portion where the ring-shaped groove 82 in which the clip 83 is fitted is formed in this way, the portion adjacent to the groove 82, for example, the outer edge of the front or rear edge of the groove 82 The outer diameter of the propeller shaft 43 is formed to be large similarly to the portion where the bearing is provided.

Next, a second embodiment of the counter-rotating propeller propulsion machine according to the present invention will be described with reference to FIG. FIG. 4 is an enlarged cross-sectional view of the essential parts of the second embodiment.
In the description of the second embodiment, the same reference numerals are given to the components corresponding to the components of the first embodiment,
Detailed description thereof will be omitted.

In the second embodiment, the bearing members 96 corresponding to the first bearing member 38 and the second bearing member 40 of the first embodiment are composed of one member instead of two members.

As described above, in the embodiment, the flange is composed of the pair of front and rear ring plates 86 and 87 which are separate parts from the outer propeller shaft 43, so that the outer propeller shaft 43 has a ring shape. The outer diameter of the portion adjacent to the groove 82 of the outer propeller shaft 43, for example, the outer diameter D1 of the outer propeller shaft 43 at the front or rear edge of the ring-shaped groove 82, can be cut out from a member having a conventional flange. It is not necessary to cut out from a member having substantially the outer diameter.

The embodiment of the present invention has been described in detail above.
The present invention is not limited to the above embodiment,
Within the gist of the present invention described in the claims,
Various changes can be made. Modification examples of the present invention are exemplified below. (1) In the embodiment, the propulsion device is an outboard motor, but it may be a propulsion device other than the outboard motor, such as an outboard motor.

(2) In the embodiment, the ring-shaped recess is composed of a groove formed continuously in the circumferential direction, but if the engaging member can be fitted, It is not always necessary to provide continuously, and it is possible to provide a plurality of recesses intermittently in the circumferential direction. (3) In the embodiment, each of the front and rear ring-shaped components is composed of one ring plate, but it is also possible to assemble a plurality of members to form the ring-shaped component.

[0030]

According to the present invention, a ring-shaped recess is formed on the outer peripheral surface of the outer propeller shaft, and the engaging member is fitted in the recess, and the engaging member is completely buried in the recess. However, a part thereof projects, and ring-shaped parts are respectively arranged in front of and behind this engaging member. And
Through this ring-shaped component, the thrust force of the outer propeller shaft is transmitted to the case of the propulsion unit. In this way, the flange of the outer propeller shaft is composed of a ring-shaped component that is a separate member from the outer propeller shaft, so it is necessary to use a material with a large outer diameter when manufacturing the outer propeller shaft by cutting. Disappear. As a result, material costs can be reduced.

Further, since the depth of the recess is less than half the thickness of the outer propeller shaft, it is possible to prevent problems in strength even if stress concentration occurs due to the recess.

Since the ring-shaped component as the flange is formed separately from the outer propeller shaft, stress concentration does not occur at the corner of the boundary between the flange and the outer propeller shaft. Further, even if stress concentration occurs at the connection between the ring-shaped component, the outer propeller shaft and the engaging member, the engaging member is deformed to disperse the stress and prevent the occurrence of a large stress. .

Further, in the outer propeller shaft, a portion which does not require so much strength has an outer diameter smaller than the outer diameter of the outer propeller shaft in a portion adjacent to the recess, and the recess is formed. The inner diameter of the outer propeller shaft is substantially the same as the inner diameter of the outer propeller shaft. Therefore, the weight can be reduced as much as the outer diameter is reduced. Moreover, since the inner diameters are substantially the same, it is not necessary to form irregularities inside the outer propeller shaft, and the outer propeller shaft can be easily manufactured.

[Brief description of drawings]

FIG. 1 is a side view of an outboard motor as a contra-rotating propeller propulsion device.

FIG. 2 is a sectional view of a lower portion of an outboard motor.

FIG. 3 is an enlarged view of a main part of FIG.

FIG. 4 is an enlarged sectional view of an essential part of a second embodiment.

FIG. 5 is an enlarged cross-sectional view of a main part of a contra-rotating propeller propulsion device that has been conventionally studied.

[Explanation of symbols]

 1 Outboard Motor (Double Reversal Propeller Propulsion Machine) 21 Front Propeller 22 Rear Propeller 43 Outer Propeller Shaft 44 Inner Propeller Shaft 82 Ring-Shaped Groove (Recess) 83 Clip (Engaging Member) 86 Front Ring Plate (Front Ring) Parts) 87 Rear ring plate (Rear ring part)

Claims (1)

[Claims] 1. An outer propeller shaft extending in the front-rear direction and having a front propeller attached to a rear end thereof, and an outer propeller shaft coaxially arranged inside the outer propeller shaft and at the rear end thereof. A counter-rotating propeller propulsion machine comprising an inner propeller shaft to which a rear propeller is attached, wherein an outer peripheral surface of the outer propeller shaft is formed with a ring-shaped recess, and the depth of the recess is reduced. Is less than half the thickness of the outer propeller shaft, and has a smaller outer diameter than the outer diameter of the outer propeller shaft in the portion adjacent to the recess, and the portion where the recess is formed. A portion having an inner diameter substantially the same as the inner diameter of the outer propeller shaft in is formed in the outer propeller shaft, the engaging member is fitted in the recess, A part is projected without being completely buried, and a front ring-shaped component is arranged on the front side of this engaging member, and a rear ring-shaped component is arranged on the rear side of said engaging member. A counter rotating propeller propulsion machine characterized by.