JP3335254B2 - Variable device for variable pitch propeller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a variable pitch propeller changing device mainly for small and medium-sized ships.

[0002]

2. Description of the Related Art Conventionally, there has been proposed a variable pitch propeller changing device for changing a propulsion speed by changing a pitch of a propeller. In such a variable pitch propeller changing device, as disclosed in Japanese Patent Application Laid-Open No. 2-144286, a gear mechanism that rotates in synchronization with rotation of a propeller boss and a gear that transmits rotation to pitch changing means are disclosed. By driving a differential gear mechanism constituted by the mechanisms with a power source, a relative speed difference is generated between the gear mechanisms to change the pitch of the propeller. However, such a conventional configuration has a problem that the gear mechanism is complicated and large, requiring a large installation space.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to simplify the gear mechanism so that the structure is simple and the size can be reduced. To provide a variable pitch propeller variable device.

[0004]

According to the present invention, there is provided a variable pitch propeller changing device in which a changing shaft is reciprocally movable in the direction of the shaft inside a hollow propeller shaft, and a screw portion is formed on an outer peripheral surface or an inner peripheral surface. A fixed sleeve having a driving gear attached thereto is externally fitted to the propeller shaft so as not to rotate with the propeller shaft, has a threaded portion on an inner peripheral surface or an outer peripheral surface, and has a gear portion along the outer peripheral portion. Is formed on the propeller shaft so as not to rotate with the propeller shaft, and the rotary moving body is fitted on the propeller shaft rotatably with the propeller shaft,
The screw portion of the moving sleeve and the screw portion of the fixed sleeve are screwed together, and the gear portion of the moving sleeve and the drive gear of the fixed sleeve are meshed with each other to rotatably connect the rotary moving body to the moving sleeve and rotate The body is connected to the variable shaft via a joint, and the moving sleeve is reciprocated via the rotary moving body by the forward / reverse rotation of the driving sleeve accompanying the forward / reverse rotation of the drive gear, thereby changing the pitch of the propeller. It is characterized by having such a configuration.

[0005]

According to the variable pitch propeller changing device of the present invention, the moving sleeve is rotated by the forward rotation of the drive gear, and the moving sleeve is screwed along the propeller shaft. Then, in response to the movement of the moving sleeve, the rotary moving ring moves forward along the propeller shaft, and the variable shaft moves forward along the propeller shaft via the joint. When the driving gear is reversed, the moving sleeve retreats along the propeller shaft, and the rotary moving body moves back along the propeller shaft in response to the movement of the moving sleeve. As a result, the variable shaft returns along the propeller shaft via the joint. The pitch of the propeller is changed by the reciprocating motion of the changing shaft.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference numeral 1 denotes a hollow propeller shaft for transmitting the power of a drive source such as an engine to a propeller blade 2,
At the center of the propeller shaft 1, a variable shaft 3 is provided so as to be movable in the axial direction of the propeller shaft 1 (FIG. 2).
A fixed sleeve 4, a moving sleeve 5, and a rotary moving body 6 for operating the inflection shaft 3 are externally fitted to an intermediate portion of the propeller shaft 1 (FIGS. 1 and 2).

The fixed sleeve 4 includes a sleeve housing 41 in which a sleeve body 41 and a bearing 42 are housed. An external thread portion 41A is formed on the outer periphery of the sleeve main body 41. The bearing housing 43 is divided into an inner housing 43A and an outer housing 43B, and the bearing 42 is provided between the inner housing 43A and the outer housing 43B (FIG. 2).

The sleeve body 4 is provided on the outer peripheral housing 43B.
A bearing 44 is formed at the outer edge of the outer peripheral housing 43B, and a shaft 71 of the long drive gear 7 is attached to the bearing 44. Also, the inner peripheral housing 43A is a propeller shaft 1
Is attached to the outer periphery of the device by a clamp ring 1B. O1
Is an oil seal.

Reference numeral 8 denotes an installation plate. A fixed sleeve 4 is attached to one side of the installation plate 8, and the other side of the installation frame 8 is fixed to the hull. A driving means (hydraulic motor) 9 is attached to the installation frame 8, and a driving shaft 91 of the driving means 9 is provided.
And the gear 72 attached to the shaft 71 of the drive gear 7 are engaged with each other (FIG. 6).

When a hydraulic motor is used as the driving means 9, the hydraulic motor is connected to a helm pump (not shown) via a hydraulic hose (not shown). Reference numeral 10 denotes a manual handle detachably attached to the drive shaft 91 of the drive means 9, which is used when manually changing the pitch of the propeller blades 2 without using the drive means 9.

A female thread portion 51A is formed on the inner peripheral surface of the sleeve main body 51 of the moving sleeve 5, and a gear portion 51B is attached to the outer periphery of the rear end of the sleeve main body 51. The female thread 51A of the moving sleeve 5 is screwed with the male thread 41A of the fixed sleeve 4, and the gear 51B of the moving sleeve 5 is meshed with the drive gear 7 attached to the fixed sleeve 4 (FIG. 2). O2 is an oil seal.

Reference numeral 6 denotes a rotary moving body, which comprises a sleeve 61 and a ring portion 52. The rotary moving body 6 is slidably fitted in the propeller shaft 1 in the axial direction of the propeller shaft 1 (FIG. 2). The rotary moving body 6 is connected to the moving sleeve 5 via a bearing 11.

A pair of left and right long holes 1A, which are long in the axial direction, are formed in the peripheral wall portion of the propeller shaft 1 corresponding to the mounting position of the ring portion 62 of the rotary moving body 6 so as to face each other. A pair of right and left joints 12 is projected from the inverting shaft 3 corresponding to the mounting position of the ring portion 62 of this joint 1.
Reference numeral 2 is attached to the ring portion 62 of the rotary moving body 6 via the elongated hole 1A (FIGS. 2 to 4).

FIGS. 7 to 9 show a variable pitch mechanism in the propeller boss 13. FIG. A predetermined number (three in the illustrated embodiment) of propeller blades 2 are mounted around the propeller boss 13. A flange-like crank 2B is formed at the base end of the propeller shaft 2A of the propeller blade 2, and a fitting groove 2C is formed on the back surface of the crank 2B. The crank 2B is rotatably fitted into a mounting hole 13A of the propeller boss 13.

On the other hand, a triangular top 15 is attached to the rear end of the variable shaft 3. An eccentric shaft 15A protrudes from the top 15 at a position eccentric from the propeller shaft 2A, and the eccentric shaft 15A is fitted into a fitting groove 2C of the crank 2B. Therefore, the top 1 accompanying the reciprocating motion of the variable shaft 3
5, the propeller blades 2 rotate about the propeller shaft 2A about the eccentric shaft 15A to change the pitch of the propeller blades 2. Reference numeral 16 denotes a rod attached to the rearmost end of the variable shaft 3, and reference numeral 17 denotes a guide hole formed on the inner wall surface at the rear end of the propeller boss.
A rod 16 is slidably fitted in the slidable member 7 (FIGS. 1 and 7).

Next, the operation of the variable pitch propeller variable device constructed as described above will be described. (1) First, the driving sleeve 9 is rotated forward and backward by the driving means 9 to rotate the moving sleeve 5 so that the moving sleeve 5 is advanced and retracted with respect to the fixed sleeve 4.

(2) The rotary moving body 6 slides along the propeller shaft 1 as the moving sleeve 5 advances and retreats, so that the propeller shaft 1
The inflection axis 3 moves inside.

(3) By the movement of the variable shaft 3, the pitch of the propeller blades 2 is changed by the variable pitch mechanism in the propeller boss 13 as described above.

[0019]

As is apparent from the above description, according to the variable pitch propeller changing device of the present invention, the gear portion of the moving sleeve is meshed with the drive gear mounted on the fixed sleeve to constitute a gear mechanism. Since this gear mechanism is used only for advancing and retracting the moving sleeve, the gear mechanism can be simplified and maintenance and inspection can be facilitated. In addition, since the fixed sleeve, the moving sleeve, and the rotary moving sleeve are fitted around the propeller shaft, it is possible to reduce the size of the variable device occupying the periphery of the propeller shaft and to reduce the installation space.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a variable pitch propeller changing device according to the present invention.

FIG. 2 is an enlarged sectional view of the embodiment.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a sectional view taken along line BB of FIG. 3;

FIG. 5 is a sectional view taken along line CC of FIG. 2;

FIG. 6 is an enlarged front view showing the same embodiment equipped with a driving means.

FIG. 7 is a front sectional view showing a variable pitch mechanism in the propeller boss of the embodiment.

FIG. 8 is a partially broken plan view showing a variable pitch mechanism in the propeller boss of the embodiment.

FIG. 9 is a partially broken side view showing the variable pitch mechanism in the propeller boss of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Propeller shaft 2 Propeller blade 3 Inflection shaft 4 Fixed sleeve 5 Moving sleeve 6 Rotating moving body 7 Drive gear 51A Female screw part (screw part) 41A Male screw part (screw part) 51B Gear part

Claims (1)

(57) [Claims] 1. A fixed sleeve in which a variable shaft is provided in a hollow propeller shaft so as to be able to reciprocate in the direction of the shaft, a screw portion is provided on an outer peripheral surface or an inner peripheral surface, and a drive gear is mounted in an appropriate position. Is not fitted to the propeller shaft so that it does not rotate with the propeller shaft, and has a threaded portion on the inner or outer peripheral surface and does not rotate with the propeller shaft. As described above, the rotary moving body is rotatably fitted to the propeller shaft together with the propeller shaft, and the screw portion of the moving sleeve and the screw portion of the fixed sleeve are screwed together with the gear portion of the moving sleeve. The drive gear of the fixed sleeve is meshed with the drive gear, and the rotating body is rotatably connected to the moving sleeve, and the rotating body is connected to the variable shaft via a joint. A variable pitch propeller device characterized in that a pitch of a propeller is changed by reciprocating an inset shaft through a rotary moving sleeve by screwing and retreating of a moving sleeve accompanying forward and reverse rotation of a gear. .