JPS61184251A - Fluctuation torque absorbing mechanism for planetary reduction gear - Google Patents

Abstract

PURPOSE:To increase a fluctuation torque absorbing effect, by a method wherein an internal gear is resiliently supported to an external casing by means of spring resilient support bodies. CONSTITUTION:Plural lines of small grooves are formed in the outer peripheral surface of an internal gear 10, and spring resilient support bodies 50 are secured in plural spots, positioned facing the small grooves 40, in the inner peripheral surface of an external casing 20. The spring resilient support body 50 is formed with a spring block in that plural leaf spring, comprising long springs at the central part and short springs on both sides, are laminated together. This constitution, when fluctuation torque is exerted by a solar gear and a planetary gear, not shown, on an internal gear 10, where the internal gear 10 is resiliently supported to the external casing 20, causes the leaf spring to be deformed in response to the exerted torque in a condition in that the forward end of the spring support body 50 is engaged with the small groove 40.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fluctuating torque absorption mechanism built into an idling speed reducer used in a marine medium-speed diesel engine or the like.

[Conventional technology]

Conventionally, when a medium-speed diesel engine is used as a marine main engine (engine), an elastic joint is generally installed between the main engine and the reducer in order to absorb the fluctuating torque of the main engine and protect the reducer gear. It is. On the other hand, for the purpose of making the engine room more compact, a compact planetary reducer is used in medium-speed diesel engines with a long total engine length, and a different type of fluctuating torque absorption mechanism is built into the planetary reducer. Proposals have been made to directly connect the main engine and the reducer without using elastic joints. That is, as shown in Fig. 2, both ends of a rod-shaped body called a balance bottle (aOO) are fixed to both ends of the internal gear (1) in the width direction, and the center part is fixed to the outer periphery of the internal gear (1). external casing (2
) by fixing it to the balance bin (SOO
), the internal gear (1) is elastically supported by the external casing (2), and the structure is such that the fluctuating torque transmitted from the main engine is absorbed.

[Problem that the invention seeks to solve]

However, the balance bin (500) is not equipped with torsion springs 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 of units that can be installed). Because the stiffness cannot be reduced,
The fluctuating torque absorption effect of this is inferior to that of the above-mentioned elastic joint, and in engines with large torque fluctuations, the balance pin (500
) alone is not sufficient to absorb the fluctuating torque, and there is a drawback that the flywheel effect must be utilized and the strength of the tooth surfaces of the sun gear, planetary gear (3), and internal gear (1) must be increased. Further, in the case of the balance bin (500), a high degree of processing accuracy is required.

The present invention has been made to solve the above problems, and aims to achieve ease of manufacture and improved absorption of fluctuating torque by elastically supporting the internal gear on the external casing using a method other than a balance bin.

[Means for solving problems]

Describing the configuration of the present invention in detail below, several grooves are provided on the facing side of either the internal gear of the planetary reducer or the external casing that is disposed around the outer periphery of the internal gear and supports the internal gear.
By supporting a spring elastic support at a position facing the groove on the other facing side and loosely fitting the other end of the spring elastic support into the groove, the internal gear is moved by the elastic force of the spring elastic support. It is elastically supported by the outer casing.

Among these, the spring elastic supports are composed of springs of various shapes such as leaf springs and ring springs, and in the present invention, they are installed at multiple points between the external casing and the internal gear, but these supports and groove loose fittings are used. Various methods can be considered depending on the type of the spring shape used.

[For production]

The present invention is similar to a balance pin in that it elastically supports the internal gear of a planetary reducer, but whereas in the case of a balance pin, there was a restriction on the torsion spring split, the spring of the spring elastic support body By changing the specifications of the supporting springs, a wider range of torsion spring stiffnesses can be selected. That is, the elastic force of the spring elastic support makes it possible to absorb a large fluctuating torque without using the flywheel effect or increasing the tooth surface strength.

〔Example〕

FIG. 1(a) shows an embodiment of the present invention. In this embodiment, a plurality of small grooves (40) are provided on the outer peripheral surface of the internal gear ring, and a plurality of small grooves (40) are provided on the inner peripheral surface of the external casing (E). Spring elastic supports (50) are provided at a plurality of locations facing the small groove (40).
) is fixed. 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 peripheral surface of the outer casing is provided with holes (20a) each having a tapered inner side at a position facing the small groove (40), and these holes (20a)
The base of the spring elastic support (50) is press-fitted and fixed therein, and the tip of the spring elastic support (50) passes through the tapered portion of the hole (20a) and is freely fitted into the small groove (40). There is.

With this configuration, the internal gear 00 is connected to the external casing (1
), the internal gear αO is elastically supported by the sun gear (
(not shown) and a planetary gear (not shown), the leaf spring deforms in proportion to the applied torque while the tip of the spring elastic support (50) remains fitted in the small groove (40). do. This action absorbs the fluctuating torque applied to the reducer.

FIG. 1(b) shows another embodiment of the present invention, and in this embodiment, a plurality of bowl-shaped grooves (41) with a further concave central portion are formed on the outer circumferential surface of the internal gear Ql). said bowl-shaped groove (41) in the inner circumferential surface of the outer casing e1);
Spring elastic supports (51) are supported at a plurality of locations facing the.

This spring elastic support (51) has a conical hole-shaped core bar (51 m
) and is made up of a rounded spring block with multiple leaf springs stacked around it. A hole (Zta) corresponding to the outer circumferential curvature of the spring elastic support (51) is formed in the inner surface of the outer casing Q1 at a position opposite to the bowl-shaped groove (41).
are respectively provided, and the outer peripheral portion of the spring elastic support (51) is inserted into these holes (21a). Also, the opposite side of the spring elastic support (51) is placed in the bowl-shaped groove (41).

At this time, the tip of the core metal (51a) is inserted into the recess of the bowl-shaped groove (41), and with this configuration, the spring elastic support (
51) is prevented from rotating.

With the above configuration, the internal gear 0υ is connected to the external casing (c)
When the internal gear α C receives a fluctuating torque via a sun gear (not shown) and a planetary gear (not shown), the spring elastic support body (51) supports the internal gear α C and the external casing. Since the shearing force due to the misalignment of e■ is received by the rounded body, the tip of each leaf spring has a bowl-shaped groove (
41) along the core bar (51 m) in the direction of the protrusion at the tip of the core bar. Such elastic deformation of the spring elastic support body (51) absorbs the fluctuating torque applied to the reduction gear.

FIG. 1(0) shows still another embodiment of the present invention,
In this embodiment, the inner peripheral surface of the outer casing (A) has small grooves (4
2) are provided in a plurality of strips, and spring elastic supports (52) are fixed at a plurality of locations facing the small grooves (42) on the outer peripheral surface of the internal gear αa. The spring elastic support (52)
This embodiment is the same as the first embodiment in that a leaf spring is used for the second embodiment.

However, holes (12a) tapered on the outside are provided at positions facing the small grooves (42) on the outer peripheral surface of the internal gear α, and the spring elastic supports ( The root of the spring elastic support (52) is made into a tree-shaped spigot (52a) and is implanted and fixed.
) is structured so that it can be inserted freely into the Therefore, the fixing of the spring elastic support body (52) and the loosely fitting part of the groove are opposite to those of the first embodiment.

With this configuration, the internal gear (6) is connected to the external casing (
Since the elastic support member (52) is elastically supported by the spring elastic support member (52), the fluctuating torque applied to the internal gear (6) is applied to the internal gear (6) as in the first embodiment.
) is absorbed by the deformation of the leaf spring.

[Effect of spread]

As explained above, according to the configuration of the present invention, the internal gear is elastically supported by the external casing by the spring elastic support, and since vibration absorption due to the elastic force of this spring is remarkable, the internal gear is not included in the planetary reducer. Among the mechanisms, compared to an absorption mechanism using a balance pin, a very high fluctuating torque absorption effect can be obtained, and manufacturing is also easy.

Although the present invention refers only to a speed reducer, it goes without saying that it is applicable to general transmissions such as speed increasers.

[Brief explanation of drawings]

FIG. 1 (!L) is a partially omitted diagram showing an embodiment of the present invention,
Figure (b) is an explanatory diagram showing another embodiment of the present invention;
c) is a partially omitted diagram showing still another embodiment of the present invention;
The figure is a perspective view showing a fluctuating torque absorption mechanism in a planetary reducer using a balance pin. In the figure, (1)(L(Iα1(6) is the internal gear, (2)(
7) Qη(2) is the outer casing, (40) (41)
(42) is a groove, (50), (51), and (52) are spring elastic supports, and (500) is a balance pin. Figure 1 Figure 1 Figure 11.21. , cost 1.21a JP-A-Sho G1-184251 (4) Fig. 1 Fig. 2

Claims (1)

[Claims] An internal gear or an internal gear installed around its outer periphery either side of the outer casing supporting multiple grooves drilled on the opposite side of the A support is provided at a position opposite to the groove on the facing side. are held, and their tips are loosely fitted into the grooves respectively. It has a plurality of spring elastic supports that are tightened. In a planetary reducer characterized by Fluctuation torque absorption mechanism.