JPH0453359Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention mainly relates to a Z-type propulsion device mounted on a tugboat.

[Conventional technology]

As a Z-type propulsion device, as shown in FIG. 2, a rotating cylinder 3 is provided with a lower gear case 1 at its lower part and is rotatably provided on a platform 2, with an upper bevel gear 4 at its upper end and a lower bevel gear 5 at its lower end. An input shaft 9 equipped with a drive bevel gear 8 is connected to an upper gear case 7 fixed to the base 2 above the rotating cylinder 3, and an input shaft 9 with a drive bevel gear 8 is connected to the upper gear case 7. A propeller shaft 12 is pivotally supported in mesh with the bevel gear 4, and is provided with a driven bevel gear 10 and a propeller 11, and is pivotally supported in the lower gear case 1 with the driven bevel gear 10 meshed with the lower bevel gear 5. It has been known.

[Problem that the invention attempts to solve]

However, in the conventional Z-type propulsion device, the driving bevel gear 8 and the upper bevel gear 4, and the lower bevel gear 5 and the driven bevel gear 10 are arranged in a one-to-one relationship.
Because of the structure in which the rotation of the input shaft 9 is transmitted to the propeller 11 by meshing with each other, a large bevel gear is required, which increases the size of the entire device and also increases the distance L from the vertical shaft 6 to the propeller 11, which increases the turning torque. As a result, the turning force of a turning device (not shown) that turns the turning tube 3 via the worm shaft 13 and the worm wheel 14 must be increased, and the upper gear case 7 and the turning tube 3,
Also, since the lower gear case 1 is large, there is a problem that the amount of lubricating oil filled therein increases.

[Means for solving problems]

The present invention pivots a hollow first vertical shaft, which has an upper inner bevel gear at the upper end and a lower inner bevel gear at the lower end, at the center of a rotating cylinder that has a lower gear case at the lower part and is rotatably provided on the platform. a second vertical shaft having an upper outer bevel gear at its upper end and a lower outer bevel gear at its lower end, centered on the first vertical shaft; Lower outer bevel gears are arranged and pivotally supported on the outer sides of the lower inner bevel gears of the first vertical shaft, and an upper gear case is provided above the rotating cylinder and fixed to the platform;
An input shaft equipped with a driving bevel gear is pivotally supported by meshing the upper part of the driving bevel gear with the upper outer bevel gear and the lower part of the driving bevel gear with the upper inner bevel gear, while a driven bevel gear and a propeller are connected to the lower gear case. The above conventional problems are solved by pivotally supporting a propeller shaft with the upper part of the driven bevel gear meshing with the lower inner bevel gear and the lower part of the driven bevel gear meshing with the lower outer bevel gear. .

[Effect]

When the input shaft is rotated by the drive device, the rotation is transmitted to the propeller shaft through two power transmission systems, a first vertical shaft and a second vertical shaft, and rotates the propeller.

That is, the rotation of the input shaft is transmitted to the driven bevel gear via the drive bevel gear → upper outer bevel gear → second vertical shaft → lower outer bevel gear, and on the other hand, the rotation of the input shaft is transmitted from the drive bevel gear → upper inner bevel gear → the first vertical shaft. →It is transmitted to the driven bevel gear via the lower inner bevel gear, rotating the propeller shaft. Therefore, it is possible to make the various bevel gears described above smaller.

〔Example〕

FIG. 1 shows an embodiment of the present invention, in which a rotating cylinder 21 is supported by a bearing 22 at the bottom of a platform 20, and a worm shaft 23 and a worm wheel are supported by a rotating device (not shown). 24 so that it can be turned left and right. Swivel tube 21
An upper gear case 25 is fixed to the platform 20 above, a lower gear case 26 is fixed to the lower end of the rotating tube 21, and an upper inner bevel gear is provided at the center of the rotating tube 21 at the upper end. 27
A hollow first vertical shaft 29, each having a lower inner bevel gear 28 at its lower end, is pivotally supported by a bearing 30, and at the center of the first vertical shaft 29,
a second vertical shaft 3 having an upper outer bevel gear 31 at its upper end and a lower outer bevel gear 32 at its lower end;
3 is inserted with the upper outer bevel gear 31 disposed above (outside) the upper inner bevel gear 27 and the lower outer bevel gear 32 disposed below (outside) the lower inner bevel gear 28, and is pivotally supported by a bearing 34. ing.

Note that the first vertical shaft 29 is a hollow upper shaft 29a.
, a hollow intermediate shaft 29b, and a hollow lower shaft 29c.
It consists of a hollow upper shaft 29a and a hollow intermediate shaft 29.
b means that by the first gear coupling 29d,
Moreover, the hollow intermediate shaft 29b and the hollow lower shaft 29c are
They are respectively connected by a second gear coupling ring 29e. The second vertical shaft 33 is composed of an upper shaft 33a, an intermediate shaft 33b, and a lower shaft 33c, and the upper shaft 33a and the intermediate shaft 33b are connected to each other by a first gear coupling 33d, and and the lower shaft 33c are respectively connected by a second gear coupling 33e.

The upper gear case 25 includes a drive bevel gear 35 and an input shaft 36 rotated by a drive device (not shown). is engaged with the upper inner bevel gear 27 and is pivotally supported by a bearing 37. Further, in the lower gear case 26, a propeller shaft 40 including a driven bevel gear 38 and a propeller 39 is arranged such that the upper part of the driven bevel gear 38 meshes with the lower inner bevel gear 28, and the lower part of the driven bevel gear 38 meshes with the lower outer bevel gear 32. In addition, it is pivotally supported by a bearing 41. 42 is a Kort nozzle.

By the way, when assembling this Z-type propulsion device, it is necessary to ensure that the torsion angles of the first vertical shaft 29 system and the second vertical shaft 33 system are the same, and that the bevel gears and gear couplings of these two systems contact the teeth at the same time. The first vertical shaft 29 and the second vertical shaft 3
3 is also provided with a coupling having a large torsion angle, such as a rubber coupling, to absorb tooth contact timing errors due to backlash between the bevel gear and the gear coupling.

Next, the operation of the Z-type propulsion device according to the present invention will be explained.

When the input shaft 36 is rotated by the drive device, the rotation is as follows: drive bevel gear 35→upper outer bevel gear 31→hollow upper shaft 33a of second vertical shaft 33→
1st gear coupler 33d → hollow intermediate shaft 33b
→Second gear coupling spring 33e→Hollow lower shaft 33
c → path of lower outer bevel gear 32, drive bevel gear 35 → upper inner bevel gear 27 → hollow upper shaft 29a of first vertical shaft 29 → first gear coupling 29d → hollow intermediate shaft 29b → second gear coupling 29e → middle It is transmitted to the driven bevel gear 38 via the path from the lower shaft 29c to the lower inner bevel gear 28, and rotates the propeller shaft 40.

Moreover, if the worm shaft 23 is rotated by the turning device, the turning tube 2 can be rotated through the worm wheel 24.
1 rotates around the first vertical axis 29 and the second vertical axis 33 to change the direction of propulsion.

[Effect of idea]

As explained above, in the Z-type propulsion device according to the present invention, the upper outer bevel gear and the upper inner bevel gear of the two vertical shafts are meshed with the drive bevel gear of the input shaft, and the driven bevel gear of the propeller shaft is engaged with the drive bevel gear of the input shaft. , the lower outer bevel gear and the lower inner bevel gear of the two vertical shafts are meshed, and the rotation of the drive bevel gear is transmitted to the driven bevel gear through two paths, so the various bevel gears mentioned above can be made smaller. Thus, the entire device can be made smaller and lighter, and the amount of lubricating oil filled in the upper gear case, the rotating cylinder, and the lower gear case can also be reduced. Furthermore, since the lower gear case can be made smaller, the distance l from the pivot center (vertical axis) of the pivot tube to the propeller can be reduced, thereby reducing the pivoting force of the pivoting device.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the Z-type propulsion device according to the present invention,
FIG. 2 is a sectional view of a conventional Z-type propulsion device. 20...Platform, 21...Swivel tube, 25...Upper gear case, 26...Lower gear case, 27...
Upper inner bevel gear, 28... Lower inner bevel gear, 29... First vertical shaft, 31... Upper outer bevel gear, 32... Lower outer bevel gear, 33...
Second vertical axis, 35... Drive bevel gear, 36...
Input shaft, 38...driven bevel gear, 39... propeller, 40... propeller shaft.

Claims (1)

[Scope of utility model registration request] A hollow first vertical shaft having an upper inner bevel gear at the upper end and a lower inner bevel gear at the lower end is pivotally supported at the center of a rotating cylinder which has a lower gear case at the lower part and is rotatably provided on the platform floor. 1, a second vertical shaft having an upper outer bevel gear at its upper end and a lower outer bevel gear at its lower end; An input shaft equipped with a drive bevel gear is mounted on an upper gear case which is arranged and pivoted on the outside of the lower inner bevel gears of the first vertical shaft and is fixed to the platform above the rotating tube. The upper part of the drive bevel gear meshes with the upper inner bevel gear, and the lower part of the drive bevel gear meshes with the upper inner bevel gear, and the propeller shaft includes a driven bevel gear and a propeller. and a lower part of the driven bevel gear are meshed and pivotally supported with the lower inner bevel gear and the lower outer bevel gear, respectively.