JPS61206850A - Star-shaped planetary gear - Google Patents

Abstract

PURPOSE:To obtain high absorbing effect upon fluctuating torque by making a fixed plate to be elastically supported to an outer casing by spring elastic supporting members. CONSTITUTION:A plurality of small grooves 40 are provided on the outer periphery surface of an inner projection 20 of an outer casing 2. And, spring elastic supporting members 50 are fixed to the inner periphery surfaces of fixed plates 1. Also, holes 10 are provided at the positions, facing the small grooves 40, on the inner periphery surface of the fixed plates 1. The holes 10 are made to be tapered, and roots of spring elastic supporting members 50 are pressingly fixed into the holes 10. Also, the edges of the spring elastic supporting members 50 are freely fitted into the small groove 40 through the taper parts of the holes 10. By this structure, the spring elastic supporting members 50 are deformed corresponding to given torque, by which fluctuating torque applied to reduction gears can be absorbed.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a star-type planetary gear device mainly used for shifting speeds in marine medium-speed diesel engines, etc., and in particular to a star-type planetary gear device that effectively absorbs fluctuating torque within the device. It is something that makes it possible.

[Conventional technology] Conventionally, when a medium-speed diesel engine is used as a marine main engine (engine), the purpose of absorbing the fluctuating torque of the main engine and retaining the gears of the gear system that performs speed changes such as speed increase and deceleration is
It is common to have an elastic joint between the main engine and the gear system. On the other hand, for the purpose of making the engine room more compact, medium-speed diesel engines with long total engine lengths use compact gear systems such as planetary-type planetary transmissions. A proposal has been made to incorporate a different type of fluctuating torque absorption mechanism into the main engine and to directly connect the main engine and the gear device without using the above-mentioned elastic joint. That is, as shown in FIG.
0) Fixing both ends of the rod-like body to both ends of the internal gear (6) in the width direction, and fixing the center part to the external casing (2) provided around the outer periphery of the internal gear (6). Accordingly, the balance pin (500) elastically supports the internal gear (6) on the external casing (2), thereby absorbing the fluctuating torque transmitted from the main engine.

[Problem that the invention seeks to solve]

However, such technology is only effective for planetary-type planetary gears; in star-type planetary gears, which are also used as transmissions, due to their structure, the balance pin (SOO) is used to absorb fluctuating torque. I can't.

That is, the internal gear (6) fixed to the external mounting (2)
), in which the planetary gear (3) revolves, but in the star type planetary gear system, the fixed plate (1) that pivotally supports the planetary gear (3) is attached to this as shown in Figure 3. Because it is fixedly supported by the external casing (2) in contact with it, even though the planetary gear (3) itself can rotate, the internal gear (6
), but instead, the internal gear (6) rotates around it and connects the sun gear shaft (7a) and the internal gear shaft (6).
It has a structure that changes speed between (a) and (a). Therefore, it is structurally impossible to install the balance pin (SOO) between the rotating gear (6) and the outer casing (2). Even if it could be provided between the two, it would be impossible to effectively absorb the fluctuating torque.

Furthermore, the balance pin (500) is not a torsion spring due to its structural limitations (for example, considering its installation position, it is natural to think that there are restrictions on dimensions and shapes regarding thickness and length, and restrictions on the number that can be installed). Since the stiffness cannot be reduced, the effect of absorbing fluctuating torque is inferior to that of the elastic joint.
For engines with large torque fluctuations, balance pin (500)
It is not sufficient to absorb the fluctuating torque only by using the balance pin ( 500), a high processing configuration would be required.

The present invention has been made in order to solve the above problems, and uses a technology that replaces the elastic support of balance pins applied to planetary controllers to elastically support the fixed plate on the outer casing, thereby simplifying manufacturing and supporting star-shaped planets. The objective is to improve the absorption of fluctuating torque in a gear device.

[Means for solving problems]

The structure of the present invention will be described in detail below.
Several grooves are provided on either one of the facing sides of the external casing that supports the l, and a spring elastic support is supported at a position opposite to the grooves on the other facing side.

By loosely fitting the other end of the spring elastic support into the groove, the fixed plate is elastically supported on the outer casing by the elastic force of the spring elastic support.

Among these, the spring elastic supports are composed of springs of various shapes such as leaf springs and annular springs, and in the present invention, they are installed at multiple points between the external casing and the fixed plate, but these supports and loose fitting methods are not used. Various aspects can be considered depending on the type of the above-mentioned spring shape ζζ.

[For production]

The present invention replaces the balance pin with a spring elastic support structure for the elastic support structure of the fixed plate in a star-type planetary gear device, and with this structural change, the fixed plate is supported by the spring of the spring elastic support body. Therefore, by changing the specifications of the spring, it is possible to select a wider range of torsion spring stiffness, unlike in the case of the balance pin. On top of that, the elastic force of the spring elastic support makes it possible to absorb large fluctuating torque without using the flywheel effect or increasing the tooth surface strength.

〔Example〕

FIG. 1 (aXb) shows an embodiment of the present invention, and as shown in FIG. 1 (a), the planetary gear (
3) is provided between a rotating sun gear (7) and an internal gear (6), and this gear (3) is rotatably supported by a fixed plate (1). The fixing plate (1) has an annular shape, and an inner surface protrusion provided on the side surface of the outer casing (2) is fitted into the inside of the fixing plate (1) to support the fixing plate (1). On the main side, a plurality of small grooves (40) are provided on the outer peripheral surface of the inner protrusion of the external casing (2), and the fixing plate (1
) Spring elastic supports (50) are fixed at a plurality of locations facing the small grooves (40) on the inner circumferential surface of the holder. The spring elastic support (50) is composed of a spring block in which a plurality of plate springs are stacked, each having a long center and short sides. The inner circumferential surface of the fixing plate (1) is provided with holes (7) each having a tapered inside at positions facing the small grooves (40), and the spring elastic supports ( The base of the spring elastic support (50) is press-fitted and fixed, and the tip of the spring elastic support (50) passes through the tapered portion of the hole αq and is freely fitted into the small groove (40).

With this configuration, the fixing plate (1) is attached to the outer casing (
2), so when the planetary gear (3) receives fluctuating torque from the internal gear (6) or sun gear (7), the fluctuating torque is transmitted to the fixed plate (1) via the planetary shaft. , the tip of the spring elastic support (50) has a small groove (40).
The leaf spring deforms in proportion to the applied torque while remaining in place. This action absorbs the fluctuating torque applied to the reducer. Note that by changing the spring length of the spring elastic support (50), the torsion spring stiffness can be freely selected.

FIG. 4 shows another embodiment of the present invention, and this embodiment is intended for a star-type planetary reducer having the same configuration as the previous embodiment.
) A bowl-shaped groove on the outer circumferential surface and further concave in the center (4
1) are provided in plurality, and spring elastic supports (51) are supported at a plurality of locations facing the bowl-shaped groove (41) on the inner peripheral surface of the fixed plate (1). This spring elastic support (51) is composed of a spring block formed by stacking and rolling a plurality of leaf springs around a cone-shaped core (SXa).
The inner circumferential surface of the fixed plate (1) is provided with the aforementioned bowl-shaped groove (41).
) are provided with holes (6) corresponding to the outer circumferential curvature of the spring elastic support (51), and these holes C
The outer circumference of the spring elastic support (51) is inserted into Lη.

Also, the opposite side of the spring elastic support (51) is inserted into the bowl-shaped groove (41). At this time, the tip of the core metal (51a) +77 is inserted into the recess of the bowl-shaped groove (41), and this configuration prevents the spring elastic support (51) from rotating.

With the above configuration, the fixing plate (1) is attached to the outer casing (2).
), when the planetary gear (3) receives a fluctuating torque from an internal gear or a sun gear (not shown),
The force is transmitted to the fixed plate (1) via the planet (31), and the spring elastic support (51) receives the shear force caused by the displacement of the fixed plate (1) and the outer casing (2) on its rounded body, so that each The tip of the leaf spring extends into the gap in the bowl-shaped groove (41) and bends toward the core metal (SXa).The fluctuations applied to the reducer due to the elastic deformation of the spring elastic support (51) The torsion spring stiffness can be freely selected by changing the ring diameter of the spring elastic support (51).

FIG. 5 shows still another embodiment of the present invention, which is directed to a star type planetary reducer having the same configuration as the first embodiment. In this embodiment, a small groove (
42) are provided, and spring elastic supports (5o) are fixed at a plurality of locations facing the small grooves (42) on the outer peripheral surface of the inner surface protrusion (A) of the outer casing (2).

This embodiment is the same as the first embodiment in that a plate spring is used for the spring elastic support (52). However, holes (22a) each having a tapered outer surface are provided on the outer circumferential surface of the inner protrusion at a position facing the small groove (42), and the spring elastic support is provided in these holes (22a). The base of the body (52) is implanted and fixed in a tree-shaped socket (SZa) 1, and the tip of the spring elastic support (52) is inserted into the hole (2).
It is configured to pass through the tapered portion of 2a) and fit freely into the small groove (42). Therefore, the fixing and free fitting locations of the spring elastic support body (52) are opposite to those of the first embodiment.

With this configuration, the fixing plate (1) is attached to the outer casing (
2), the variable torque applied to the fixed plate (1) is transferred to the spring elastic support member (52) as in the first embodiment.
) is absorbed by the deformation of the leaf spring.

〔Effect of the invention〕

As explained above, with the configuration of the present invention, for example, the fixed plate is not elastically supported by the outer casing by the spring elastic support, and vibration absorption due to the elastic force of the spring is significant, so that it is also suitable for star type planetary gear devices. A very high fluctuating torque absorption effect can be obtained, and manufacturing is also easy.

[Brief explanation of drawings]

Figures 1 (a) and (b) are partially omitted views showing one embodiment of the present invention, Figure 2 is a perspective view showing a fluctuating torque absorption mechanism in a planetary reducer using a balance bin, and Figure 3 is a star type FIG. 4 is an explanatory diagram showing the structure of a planetary gear device, FIG. 4 is an explanatory diagram showing another embodiment of the present invention, and FIG. 5 is a partially omitted diagram showing still another embodiment of the present invention. In the figure, (1) is the fixed plate, (2) is the external casing, (3
) is a planetary gear, (6) is an internal gear, and (7) is a sun gear. (A) 01) (A) is an inner protrusion, (40) (41) (4
2) indicates a groove, (50), (51), and (52) a spring elastic support, and (SOO) a balance pin.

Claims (1)

[Claims] A fixed plate that pivotally supports a planetary gear or the fixed plate of the outer casing that abuts and supports the Multiple holes drilled on either facing side groove, and a groove opposite to the groove on the other facing side. It is supported in the position where the tip is in the groove. Multiple elastic springs loosely fitted into each A star characterized by having a support body. type planetary gear system.