JP2864445B2 - Variable pitch propeller device for small high-speed marine outboard motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable pitch propeller device for an outboard motor mounted on a small boat such as a motor boat, and more particularly to a variable pitch propeller suitable for a small high-speed boat in which the pitch of a propeller is frequently changed. It relates to a propeller device.

[0002]

2. Description of the Related Art A variable pitch propeller device for changing the pitch of a propeller in a marine propulsion device is conventionally known. An example of this conventionally known variable pitch propeller device will be described with reference to FIGS. 11 and 12. A pinion 2 is provided at the tip of a flexible shaft 1, and a spur gear 3 is provided so as to mesh with the pinion 2. . A nut 4 is fixed to the spur gear 3, and the nut 4 is screwed to a screw portion formed on a screw shaft 5. The spur gear 3 is rotatable and cannot move in the axial direction.
A sliding member 7 having a long groove 6 is provided at an end of the screw shaft 5. The screw shaft 5 extends through the hollow propulsion shaft 8. On the other hand, the base end of the propeller 9 is
0, and the mounting disk 10 is rotatably mounted on the hub 11. An eccentric pin 12 protrudes from the mounting disk 10, and the eccentric pin 12 is fitted in a long groove 6 formed in the sliding member 7.

[0003] The pitch change in the above-mentioned known variable pitch propeller device is performed as follows. Now, when the flexible shaft 1 is rotated to rotate the pinion 2, the spur gear 3 meshing with the pinion 2 is rotated. Spur gear 3
When the shaft rotates forward and backward, the screw shaft 5 moves forward and backward linearly. For this reason, the sliding member 7 moves forward and backward linearly to the left and right in the figure, the mounting disk 10 is rotated by the eccentric pin 12, and the pitch of the propeller 9 fixed to the mounting disk 10 is changed. Becomes

[0004]

However, the above-mentioned known variable pitch propeller device has the following technical problems. First, as a general technical matter, a large ship and a small high-speed ship each have a large difference in technical problems required for a variable pitch propeller device. That is,
In a large vessel, the frequency of requesting the pitch change of the propeller is relatively low, and even if the response speed of the pitch change is relatively slow, no problem occurs. However, in a small and high-speed ship such as a leisure motor boat or a competition motor boat, the pitch change of the propeller is frequently requested, and the response speed of the pitch change must be instantaneous. For this reason, in a leisure motorboat or a competitive motorboat, the variable pitch propeller device must be manufactured at a small size, light weight and low cost, but this involves great difficulty. Therefore, conventionally, large ships are equipped with a variable pitch propeller device, but small ships, especially small high-speed ships, are usually not equipped with a variable pitch propeller device. However, even with a small high-speed ship, it is necessary to reduce fuel consumption and maintain stable running.In addition, being able to change the pitch of the propeller in a leisure motorboat is satisfactory to the pilot alone. It gives a feeling.

[0005] Therefore, in recent years, there has been an increasing trend to equip small high-speed ships with a variable pitch propeller device. When the variable pitch propeller device is applied to a small high-speed ship, it is usual that the structure of the variable pitch propeller device applied to a conventionally known large ship is reduced in size and equipped as it is. Ships and small high-speed ships were not always satisfactory because there were significant differences in technical issues required for variable pitch propeller devices.

This will be described with reference to the known variable pitch propeller device shown in FIGS. 11 and 12. In the known variable pitch propeller device, a pinion 2 coaxial with a flexible shaft 1 is rotated, and a spur gear is rotated by the pinion 2. 3, the screw shaft 5 is reciprocated by the rotation of the spur gear 3, so that the movement amount of the screw shaft 5 with respect to the rotation amount of the pinion 2 is small, and it takes time to change the pitch. For this reason, a difficulty arises in response speed. In order to improve this, the number of teeth of the pinion 2 should be increased and the number of teeth of the spur gear 3 should be reduced. It will be difficult. Further, since the structure in which the pinion 2 and the spur gear 3 are meshed is disposed in front of the propulsion device casing, the size of the propulsion device casing is correspondingly increased, which leads to an increase in resistance.
From the above, the variable pitch propeller device having the structure shown in FIGS. 11 and 12 is suitable only for a relatively large ship, and is simply reduced in size to be applied to a variable pitch propeller device for a small high-speed ship. Had difficulties.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to provide a variable pitch propeller for a small high-speed ship that is small and lightweight, easy to operate, and has a high response speed. It is to provide a device.

[0008]

SUMMARY OF THE INVENTION The present invention is characterized in that a propulsion shaft casing, a propeller rotatably provided on the propulsion shaft casing, an eccentric pin provided on the propeller, and an eccentric pin. Actuating the operating mechanism, actuating the operating mechanism to move the eccentric pin,
Thus, in the variable pitch propeller device configured to change the pitch angle of the propeller, the operating mechanism for operating the eccentric pin includes an eccentric pin connecting mechanism that can convert linear reciprocating motion into rotational movement, and one end includes the eccentric pin connecting mechanism. The control rod is connected to the eccentric pin connecting mechanism, the other end is rotatably connected to the adjusting screw, and is capable of linearly reciprocating.The control rod, the pinion or sprocket provided on the adjusting screw, and the control screw are provided on the adjusting screw. A screw part, a fixing nut screwed to the screw part, and fixed to the propulsion shaft casing;
The variable pitch propeller device of a small high-speed marine outboard motor comprising a chain wound around the rack or the sprocket meshing with the pinion, and an actuating means for reciprocating the rack or the chain. The variable pitch propeller device of a small high-speed outboard motor for boats, which is provided with a torsion spring mechanism for returning a chain from an operating position to an original position as required.

Another feature of the present invention resides in that the eccentric pin connecting mechanism includes a plurality of links connected via pins provided on the control rod, and eccentric pins connected to the links. is there.

Another feature of the present invention is that the eccentric pin connecting mechanism comprises a bush rotatably provided on the control rod, a cam provided on the bush, and a plurality of cams abutting on the cam. It consists of an eccentric pin.

[0011]

According to the present invention, the pitch angle of the propeller can be easily changed by operating the rack operating means or chain operating means, and automatically by disabling the rack operating means. The pitch angle of the propeller returns to the original position.

[0012]

FIG. 1 is a sectional view showing a variable pitch propeller device according to an embodiment of the present invention, and FIG.
It is sectional drawing. FIG. 3 is a sectional view taken along line BB of the propeller portion of FIG. FIG. 4 is a sectional view showing the rack operating means.
Referring to FIGS. 1 to 3, a propulsion machine casing 21 is attached to a hull (not shown), and a hollow propulsion shaft 22 is rotatably provided in the propulsion machine casing 21. A bevel gear 23 is fixed to one end of the propulsion shaft 22. The bevel gear 23 meshes with a bevel pinion 25 provided at an end of the transmission shaft 24. Conduction shaft 2
The rotation of a motor (not shown) is transmitted to 4. The propulsion shaft 22 is supported by a holding frame F held by the propulsion device casing 21.
Are rotatably supported via a ball bearing 26 and a needle bearing 27. An oil seal 2 is provided at the end of the holding frame F.
A seal 8 is provided to prevent seawater or the like from entering the rotation transmitting mechanism. Similarly, the transmission shaft 24 is mounted on the holding frame 29 attached to the propulsion device casing 21 by the ball bearing 3.
It is rotatably supported via a zero and a needle bearing 31.

A spinner 33 is fixed to the other end of the propulsion shaft 22 via a boss 32. A hole 34 is formed in the spinner 33, and a control rod 35 and a link 39 described later are movable. A control rod 35 is inserted through a hollow portion of the propulsion shaft 22.
One end of the control rod 35 is supported and connected to an adjusting screw 37 via a bearing 36, so that the adjusting screw 37 is rotatable. Two links 39 are connected to the other end of the control rod 35 via pins 38. In this embodiment, two propellers 40 are provided.
Although the link is a book 39, the present invention is not limited to the structure of this embodiment. If the number of propellers is three, the number of links is three. If the number of propellers is four, the number of links is four.
It is a link to a book.

A rotating shaft 41 formed at the base end of the propeller 40 is rotatably supported by the spinner 33 and the boss 32. A disk 42 is formed at the inner end of the rotation shaft 41, and an eccentric pin 43 is attached to the disk 42 to the rotation shaft 4.
It protrudes at a position eccentric from the first rotation axis. The eccentric pin 43 is rotatably connected to the link 39.

The structure of the adjusting screw 37 is as follows. That is, one end is spread in a flange shape, and the bearing 36 is provided in the flange-shaped portion. The other end has a threaded threaded portion 37A, which is screwed into the fixing nut 44. The screw portion 37A is formed integrally in this embodiment, but the present invention is not limited to this embodiment, and includes a structure in which a separate screw portion is fixed. The fixing nut 44 is fixed to the propulsion unit casing 21. A pinion 45 is formed by cutting teeth at an intermediate portion of the adjusting screw 37, and the pinion 45 meshes with a rack 46. In this embodiment, the pinion 45 is formed integrally with the adjusting screw 37. However, the present invention is not limited to this embodiment, and a structure in which a separate pinion is fixed to the adjusting screw is provided. This is included in the present invention. A guide projection 47 is formed at an end of the adjustment screw 37 on the fixed nut 44 side, and the guide projection 47 is formed in a guide hole 4 formed in the propulsion device casing 21.
8 is immersed.

Next, referring to FIG. 4 and FIG.
A mechanism for operating the rack 46 will be described. The rack 46 is fixed to one end of a control rod 49. The control rod 49 is slidable by being inserted into a cylindrical guide member 50 held in the propulsion unit casing 21. The other end of the control rod 49 is connected to a connection rod 52 by a universal joint 51. The connection rod 52 is connected to one projection 53A of a bell crank 53 having two projections formed to protrude from a disc body. Are linked. A wire 54 is connected to the other protrusion 53B of the bell crank 53, and the wire 54 can be pulled and loosened by an operating member (not shown) such as a lever.

Referring also to FIG. 6, the bell crank 53 is fixed to a rotating shaft 55, and the rotating shaft 55 is rotatably held by a bearing cylinder 57 held by a case 56. One end of a torsion spring 58 is fixed to the bell crank 53, and the other end of the torsion spring 57 is fixed to a case 56. The wire 54 has a projection 53B
The wire 54 is inserted into the adjuster stopper 59 fixed to the wire 54, and the wire 54 is pressed and fixed by the fixing bolt 60.

The operation of the variable pitch propeller device of the present invention configured as described above will be described below.
An operating member such as a lever (not shown) is operated to
Is pulled, the bell crank 53 is rotated against the torsion spring 58, and the sliding rod 49 is pulled upward in the drawing via the connection rod 52 and the universal joint 51. Then, the rack 46 is operated, and the adjustment screw 37 is rotated by the pinion 45 meshing with the rack 46. Since the screw portion 37A of the adjusting screw 37 is screwed into the fixing nut 44, the adjusting screw 37 moves forward by rotation. Therefore, the control rod 3 connected to the adjusting screw 37 via the bearing 36
5, the link 39 connected via the pin 38 is pulled and closed, and the eccentric pin 4 connected to the link 39 is moved.
The propeller 40 is rotated about the rotation shaft 41 via the rotation shaft 3. As a result, the pitch angle of the propeller 40 can be changed. Next, when the pulling of the wire 54 by the operating member is released, the bell crank 53 is returned and rotated by the torsion spring 58, the rack 46 returns to the original position, and the pitch angle of the propeller 40 also returns to the original angle.

In the above description, the eccentric pin connecting mechanism for rotating the propeller 40 by the reciprocating motion of the control rod 35 includes the pin 38, the link 39, and the eccentric pin 4
3, the eccentric pin connecting mechanism of the present invention is not limited to the illustrated embodiment. For example, a known eccentric pin connecting mechanism including a sliding member and a long groove shown in FIGS. You can also.

The present invention also includes a structure having no return action by a torsion spring.

Next, another embodiment of the present invention will be described with reference to FIGS. FIG. 7 is a sectional view showing a variable pitch propeller device according to another embodiment of the present invention, and FIG. 8 is a sectional view taken along line XX of FIG. FIG. 9 is a sectional view taken along the line YY of the propeller portion of FIG. FIG. 10 is a sectional view taken along the line ZZ in FIG. Referring to FIGS. 7 to 10, a propulsion machine casing 61 is mounted on a hull (not shown), and a hollow propulsion shaft 62 is rotatably provided in the propulsion machine casing 61. A bevel gear 63 is fixed to one end of the propulsion shaft 62. The bevel gear 63 is engaged with a bevel pinion 65 provided at an end of the transmission shaft 64. The rotation of a motor (not shown) is transmitted to the transmission shaft 64. The propulsion shaft 62 includes a ball bearing 66 and a needle bearing 6 on a holding frame F held by the propulsion device casing 61.
7 so as to be rotatable. An oil seal 68 is provided at an end of the holding frame F, and is sealed so that seawater or the like does not enter the rotation transmitting mechanism. Similarly, the transmission shaft 64 is rotatably supported by a holding frame 69 attached to the propulsion device casing 61 via a ball bearing 70 and a needle bearing 71.

A spinner 73 is fixed to the other end of the propulsion shaft 62 via a boss 72. A hole 74 is formed in the spinner 73, and a control rod 75 and a cam 79 described later are movable. A control rod 75 is inserted through a hollow portion of the propulsion shaft 72. One end of the control rod 75 is supported and connected to an adjusting screw 77 via a bearing 76, whereby the adjusting screw 77 is rotatable. A bush 78 is rotatably provided at the other end of the control rod 75, and a cam 79 is provided on the bush 78.

A rotary shaft 81 formed at the base end of a propeller 80 is rotatably supported by the spinner 73 and the boss 72. A disk 82 is formed at the inner end of the rotation shaft 81, and an eccentric pin 83 is attached to the disk 82 to the rotation shaft 8.
It protrudes at a position eccentric from the first rotation axis. A ring R is fitted to the eccentric pin 83. The eccentric pin 83 is in contact with the cam 79. Note that the ring R can be omitted.

The structure of the adjusting screw 77 is as follows. That is, one end is spread like a flange, and the bearing 76 is provided in the flange-like portion. The other end has a threaded threaded portion 77A, which is screwed into a fixing nut 84. Although the screw portion 77A is formed integrally in this embodiment, the present invention is not limited to this embodiment, and includes a structure in which a separate screw portion is fixed. The fixing nut 84 is fixed to the propulsion device casing 61. A sprocket 85 is formed by cutting teeth at an intermediate portion of the adjusting screw 77,
A chain 86 is wound around the sprocket 85.
In this embodiment, the sprocket 85 is formed integrally with the adjusting screw 77. However, the present invention is not limited to this embodiment, and a structure in which a separate sprocket is fixed to the adjusting screw is provided. This is included in the present invention. A guide projection 87 is formed at an end of the adjustment screw 77 on the fixed nut 84 side, and the guide projection 87 is immersed in a guide hole 88 formed in a cap 61A fixed to the propulsion device casing 61. The cap 61A is detachably provided on the propulsion device casing 61 by bolts 61B.

The mechanism for operating the chain and sprocket is the same as that shown in FIG. 4 and will not be described.

The operation of the variable pitch propeller device configured as described above according to another embodiment of the present invention will be described below. The chain 8 is operated by an operating mechanism (not shown).
When the wheel 6 is operated, the adjusting screw 77 is rotated by the sprocket 85 meshing with the chain 86. Since the screw portion 77A of the adjusting screw 77 is screwed into the fixing nut 84, the adjusting screw 77 moves forward by rotation. For this reason, the control rod 75 connected to the adjusting screw 77 via the bearing 76 moves forward, the cam 79 provided on the bush 78 moves, and the eccentric pin 83 abuts on the cam 79. The propeller 80 is turned around the rotation shaft 81. Thus, the pitch angle of the propeller 80 can be changed.

The above embodiment of the present invention includes a structure with or without a return action by the torsion spring.

[0028]

According to the present invention configured as described above, the following effects can be obtained. First, since it is a reciprocating mechanism of the control rod using a rack and pinion or a chain and a sprocket, the structure is simple and easy to operate, and the response speed is also fast, so it is necessary to change the pitch angle frequently. It can be easily and effectively applied to high-speed ships. Furthermore, since the transmission mechanism using the rack and the pinion is small and compact, the volume occupied inside the propulsion device casing is reduced, and there is no increase in fluid resistance. Further, since the transmission mechanism using the chain and the sprocket is downsized in the vertical direction by the moving area of the rack as compared with the transmission mechanism using the rack and the pinion,
The occupied volume inside the propulsion device casing is further reduced, and the increase in the fluid resistance is further reduced. or,
If the structure is provided with a return mechanism using a torsion spring, the return is automatically performed, so that the operation is easy even when the pitch angle is frequently changed.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a variable pitch propeller device according to one embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA in FIG. 1;

FIG. 3 is a sectional view taken along the line BB of the propeller portion in FIG. 2;

FIG. 4 is a sectional view showing a rack mechanism.

FIG. 5 is a sectional view taken along the line CC of FIG. 1;

FIG. 6 is a sectional view showing a return mechanism.

FIG. 7 is a sectional view showing a variable pitch propeller device according to another embodiment of the present invention.

FIG. 8 is a sectional view taken along line XX of FIG. 7;

FIG. 9 is a sectional view of the propeller section taken along the line YY of FIG. 8;

FIG. 10 is a sectional view taken along the line ZZ of FIG. 7;

FIG. 11 is a sectional view showing an example of a conventionally known variable pitch propeller device.

FIG. 12 is a sectional view taken along the line DD in FIG. 11;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 Propulsion machine casing 22 Propulsion shaft 23 Bevel gear 24 Conduction shaft 25 Bevel pinion F Holding frame 29 Holding frame 32 Boss 33 Spinner 35 Control rod 37 Adjust screw 38 Pin 39 Link 40 Propeller 41 Rotating shaft 42 Disk 43 Eccentric Pin 44 Fixing nut 45 Pinion 46 Rack 53 Bell crank 54 Wire 61 Propeller casing 62 Propulsion shaft 63 Bevel gear 64 Conduction shaft 65 Bevel pinion F Holding frame 69 Holding frame 72 Boss 73 Spinner 75 Control rod 77 Adjust screw 78 Bush 79 Cam 80 Propeller 81 Rotating shaft part 82 Disk body 83 Eccentric pin 84 Fixing nut 85 Sprocket 86 Chain

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Hirofumi Shiba 19, Natsushimacho, Yokosuka City, Kanagawa Prefecture Sumitomo Heavy Industries Machinery Co., Ltd. Oppama Shipyard (56) References JP-A-58-191690 (JP, A) JP-A Sho 58-8494 (JP, A) JP-A-2-144288 (JP, A) JP-A-53-151098 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B63H 3/04 B63H 20/14

Claims (6)

(57) [Claims] A propelling machine casing, a propeller rotatably provided on the propelling machine casing, an eccentric pin provided on the propeller, and an operating mechanism for operating the eccentric pin, and operating the operating mechanism. A variable pitch propeller device configured to move the eccentric pin to thereby change the pitch angle of the propeller, wherein an operating mechanism for operating the eccentric pin is capable of converting linear reciprocating motion into rotary movement. A pin connecting mechanism, one end is connected to the eccentric pin connecting mechanism, the other end is rotatably connected to the adjusting screw, a control rod that is capable of linearly reciprocating, and a pinion provided on the adjusting screw. A screw portion provided on the adjusting screw; and a screw portion screwed to the screw portion and fixed to the propulsion device casing. A fixed nut, a rack meshing with the pinion, and a rack operating means for reciprocating the rack, wherein the rack operating means is operated to change a pitch angle of the propeller. Variable pitch propeller device for small high-speed marine outboard motors. 2. A propulsion machine casing, comprising: a propeller rotatably provided on the propulsion machine casing; an eccentric pin provided on the propeller; and an operating mechanism for operating the eccentric pin. A variable pitch propeller device configured to move the eccentric pin to thereby change the pitch angle of the propeller, wherein an operating mechanism for operating the eccentric pin is capable of converting linear reciprocating motion into rotary movement. A pin connecting mechanism, one end is connected to the eccentric pin connecting mechanism, the other end is rotatably connected to the adjusting screw, a control rod that is capable of linearly reciprocating, and a pinion provided on the adjusting screw. A screw portion provided on the adjusting screw; and a screw portion screwed to the screw portion and fixed to the propulsion device casing. And a torsion spring mechanism for returning the rack from an operating position to an original position. The rack operating means is operated by operating the rack operating means. The pitch angle of the propeller is thereby changed, and the pitch angle of the propeller is automatically returned to the original position by disabling the rack operating means. Variable pitch propeller device for external unit. 3. A propulsion machine casing, a propeller rotatably provided on the propulsion machine casing, an eccentric pin provided on the propeller, and an operating mechanism for operating the eccentric pin. A variable pitch propeller device configured to move the eccentric pin to thereby change the pitch angle of the propeller, wherein an operating mechanism for operating the eccentric pin is capable of converting linear reciprocating motion into rotary movement. A pin connecting mechanism, one end of which is connected to the eccentric pin connecting mechanism, the other end of which is rotatably connected to an adjusting screw, and a control rod which is capable of linearly reciprocating; and a sprocket provided on the adjusting screw. A screw portion provided on the adjusting screw; A fixed nut, a chain wound around the sprocket, and chain operating means for reciprocating the chain, the pitch angle of the propeller is changed by operating the chain operating means. A variable pitch propeller device for a small high-speed marine outboard motor. 4. A propulsion unit casing comprising: a propulsion unit casing; a propeller rotatably provided on the propulsion unit casing; an eccentric pin provided on the propeller; and an operating mechanism for operating the eccentric pin. A variable pitch propeller device configured to move the eccentric pin to thereby change the pitch angle of the propeller, wherein an operating mechanism for operating the eccentric pin is capable of converting linear reciprocating motion into rotary movement. A pin connecting mechanism, one end of which is connected to the eccentric pin connecting mechanism, the other end of which is rotatably connected to an adjusting screw, and a control rod which is capable of linearly reciprocating; and a sprocket provided on the adjusting screw. A screw portion provided on the adjusting screw; A fixed nut, a chain wound around the sprocket, chain operating means for reciprocating the chain, and a torsion spring mechanism for returning the chain from an operating position to an original position. A small-sized device wherein the pitch angle of the propeller is changed by activating the means, and the pitch angle of the propeller is automatically returned to the original position by disabling the chain operating means. Variable pitch propeller device for high speed marine outboard motor. 5. The eccentric pin connecting mechanism comprises a plurality of links connected via pins provided on a control rod, and an eccentric pin connected to the links. 5. A variable pitch propeller device for a small high-speed marine outboard motor according to 4. 6. An eccentric pin connecting mechanism comprising a bush rotatably provided on a control rod, a cam provided on the bush, and a plurality of eccentric pins abutting on the cam. The variable pitch propeller device for a small high-speed marine outboard motor according to claim 1.