JPS59113364A - Marine reduction gear reversing machine - Google Patents

Abstract

PURPOSE:To make a one step reduction ratio securable in space between a gear and an output shaft, by having a planetary gear type reduction gear built in an empty space in and around the output shaft beneath a clutch. CONSTITUTION:An input shaft 16 provided with a clutch housing 21 is supported at the upper part of a clutch case 10 while an output shaft 19 is as well supported at the lower part of the clutch case 10 in parallel with each other. A gear 35 to be supported on top of the output shaft 19 is solidly provided with a cylindrical, large diametral inner gear 37 as one body, and this inner gear 37 projects into the inside of an empty space 25 beneath a forward unit 20. Three fulcrum shafts 41 in parallel with the output shaft 19 are installed in an outward flange 40 attached to the output shaft 19 located between the gear 35 and an external gear 38, and planetary gears 42 supported on each of these fulcrum shafts 41 are engaged with the internal gear 37 and the external gear 38 whereby a planetary gear part 36 is formed up.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reduction/reversing gear for marine vessels, which enables a conventional small reduction clutch case to have a reduction ratio from a minimum of approximately 20 to a maximum of approximately 8.0. The purpose is to

Conventionally, (1) a clutch case for large deceleration is also used for small deceleration, or (2) separate clutch cases with different distances between the input and output shafts are used for small and large deceleration. However, since the above-mentioned item (1) is a system that also serves as a smaller clutch than 6 tons, -2 clutch cases are sufficient, but the problem of increased cost and 9 weight increases arises, and the conditions for installation on the ship's hull become difficult. That is, the first
As shown in the figure, the bottom of the clutch case 2 attached to the rear of the engine l is deep, and when trying to install it at the stern, the part 3 hits the hull 4 (making it impossible to install it at the stern). (to the left in the figure), requiring a large engine room 5. Also, if the method described in item (2) above is adopted, the input/output shaft pressure MA for small deceleration and large deceleration
are different, causing problems when replacing the engine.

In other words, major modifications to the hull and installation platform will be required. Note @1
In the figure, 6 is a joint, 7 is a thrust shaft, and 8 is a propeller.

Generally, in a marine reduction/reversing gear, an input shaft is supported in the upper part of the clutch case, and an output shaft is supported in the lower part in parallel with each other, and a multi-plate clutch is mounted on the input shaft, and the clutch is connected to the input shaft. A small gear that is cut off is provided, and a structural thread is used that meshes the large gear provided on the output shaft with the small gear.
It is easy to obtain a relatively large volume of space around the output shaft below the clutch.

The present invention has focused on this point, and by incorporating a planetary gear type reducer in the above space, a one-stage reduction ratio of 11j is provided between the large gear and the output shaft, and a second-stage reduction ratio is provided between the large gear and the output shaft. An example is shown in FIG.

The clutch case IO in FIG. 2 has open front and rear (left and right in the figure) ends, and there is an end cover 11 which also serves as a bearing support member.
12 is fastened with a plurality of bolts. A bearing 14 is installed in the upper part of the clutch case IO.

An input shaft 16 is connected through the input shaft 15, and a bearing 17.
Output shafts 19 are supported parallel to each other via 18.

Reference numeral 20 denotes a forward movement unit using a conventionally widely used wet type multi-disc clutch, whose clutch housing 21 is tapered fitted to the input shaft 16 and tightened with a nut 22. 23C, the input flange, whose central portion is fastened to the boss portion of the crank/X housing 21 with multiple bolts 24; A small gear 26 rotatably supported on the input shaft 16 has an integral drum 27 located within the clutch housing 21 . The annular piston 28, which is fitted into the inner surface of the clutch housing 21 and the surface of the input shaft 160, receives the leftward elasticity of the compression spring 29.

A pressure plate 30 is fixed to the open end of the clutch housing 21 by, for example, a snap ring. piston 28
A plurality of plates 31 and friction plates 32 are provided between the pressure plate 30 and the pressure plate 30.
are arranged alternately, and each plate 31 has a protrusion provided on its outer periphery that fits into the vertical groove of the clutch housing 21, so that the plates 31 are aligned in the axial direction.
The spline on the inner circumference of the friction plate 32 is fitted onto the drum 271, and the friction plate 32 is slidable only in the axial direction. Therefore, when hydraulic pressure is supplied to the pressure chamber 33 behind the piston 28, the plate 31 and the friction plate 32 come into pressure contact, the clutch is connected, and the housing 21 and the small gear 26 are integrated.

Numeral 34 is a gear provided on the outer periphery of the housing 21, which constantly meshes with a corresponding gear on the outer periphery of the clutch housing of a reverse unit (not shown) arranged in parallel with the n11 unit 20. A small gear (corresponding to the gear 26) meshes with the large gear 35 together with the small gear 26.

The large gear 35 supported on the output shaft 19 is integrally equipped with a cylindrical large-diameter internal tooth 37, and this internal tooth 37 is connected to the forward unit (2).
0 into the space 25 below.

Clutch case 10- on the opening side of the internal teeth 37 (left side in the figure)
The moss small diameter external teeth 38 are attached with a plurality of bolts 39. Three support shafts 41 parallel to the output shaft 19 are provided on an outward flange 40 provided on the output shaft 19 between the large gear 35 and the external teeth 38, and a planetary gear 42 supported on each support shaft 41 is provided inside. The teeth 37 mesh with the external teeth to form a planetary gear portion 36 (Fig. 3).

During operation, the input shaft 16 rotates to the left (arrow L) when viewed from the navigation (right side in the figure). When the clutch of the forward unit 20 is connected, the small gear 26 is driven to rotate in the same direction, and the large gear 3
5 rotates to the right (in the direction of arrow R) when viewed from the front. Big gear 3
5 and the larger diameter inner tooth 37 also move toward the right (arrow R) as shown in FIG.
) Since the planetary gear 42 rotates by t, the planetary gear 42 revolves in the right direction while rotating in the right direction around the fixed small diameter external teeth 38. The revolution of the planetary gear 42 is transmitted to the output shaft 191 via the support shaft 41 (FIG. 2) and the flange 40, and the output shaft 19 is decelerated and driven to rotate in the right direction.

The conventional small speed reduction clutch case lO shown in Fig. 2 is 11
By using 1 and changing the combination of the internal small gear 26 and large gear 35, i,
1, 12. When it is possible to obtain i3 and three different reduction ratios, if the reduction ratio of the idler gear part 36 is i4, the obtained reduction range is il, 12. i, 3.11ah
14, i, 2 @ i4. i, 3*14c
7) Six possibilities are possible.

That is, the reduction ratio i1. In addition to i2.13, deceleration ull @ i when the canine tooth $ 35 is rotatably supported on the output 'f'ill 19 to form the planetary gear part 36
4, 12・i−4, i3・i4 are added. Specifically, for example, 11=2.0. 1.2=2.5. 13=3
．． 0. If 1.4=2.5, the reduction ratio of 1 yen will be 2,0.2.5.3.0.5.0.6.2.7.5.

As explained above, according to the present invention, since the planetary gear device is arranged around the output shaft in the space below the clutch provided on the input shaft, (1) the conventional small reduction clutch case can be used to reduce the reduction ratio. It can cover from 2.0 in 1 to 8.0 in imax. In other words, in marine reduction/reversing gears, the distance between the input and output shafts can be changed from 1 small reduction (reduction ratio of approx. 3.0 or less) to large reduction (reduction ratio of 3.5 or more to approx. 8.0) without changing the distance between the input and output shafts. This can be achieved by using a clutch case for small reductions, making it possible to create an inexpensive, lightweight and compact marine reduction/reversal machine for large reductions.

(2) Since small and large speed reducers can be obtained in one small case, there is no need to modify the ship's body when replacing the engine, and installation at the stern is easy, which shortens the engine room and increases the effective area of the ship. That is, the structure for small reduction is the same as the conventional structure (the large gear 35 is fixed to the output shaft 19 and the planetary gear 42 is removed), and only for large reduction, the planetary gear section 36 shown in FIG. 2 is used. Just add. In this case, the propeller rotation direction is the same for both small and large reductions.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of the left side of the tank to explain the conventional problem;
The figure is a longitudinal sectional view of the speed reduction/reversing machine according to the present invention, and FIG.
It is a partial cross-sectional view taken along ■-■ of the figure. 1o...Clutch case, 16...Input shaft, 19...Output shaft, 2゜...
Wet type multi-plate clutch advance unit, 25... Space, 26
... Small gear, 35... Large gear, 37... Large diameter internal teeth, 38... Small diameter external teeth, 40... Flange, 41...
・Support shaft, 42...planetary gear

Claims (1)

[Claims] The input shaft is supported in the upper part of the clutch case, and the output shaft is supported in the lower part in parallel with each other.A multi-disc clutch is provided on the input shaft, and a pinion that is connected to and disconnected from the input shaft by the clutch is provided. A large gear supported by the gear meshes with the small gear, and large-diameter internal teeth are integrally and concentrically provided with the large gear and project into the space surrounding the output shaft below the clutch. The small-diameter external teeth of fW L are arranged concentrically within the internal teeth, and the flange provided on the output shaft between the large gear and the external teeth is provided with multiple support shafts parallel to the output shaft, and a planet supported on each support shaft is provided. A marine reduction/reversing machine characterized by gears meshing with internal and external teeth.