JPS61184253A - Fluctuation torque absorbing mechanism for planetary reduction gear - Google Patents

Abstract

PURPOSE:To absorb fluctuation torque, by a method wherein a deforming annular body formed by steel sheet is attached between an internal gear and an outer casing. CONSTITUTION:A deforming annular body 50 is inserted between a side surface 10a of an internal gear 10 and a vertical wall surface 20a of an outer casing 20, and is secured between the two surfaces 10a and 20a. The deforming annular body 50 is formed with a cylinder shell made of steel conforming to a curvature of a portion right near to the outer periphery side of the internal gear 10, and is welded to the side surface 10a and the vertical wall surface 20a by welding. Since the internal gear 10 is resiliently supported to the outer casing 20, when fluctuation torque is exerted on the internal gear 10 through a solar gear and a planetary gear, not shown, the deforming annular body 50 is twisted depending upon torque exerted thereon to absorb the fluctuation torque.

Description

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

(Prior art) Conventionally, when a medium-speed diesel engine is used as a marine main engine (engine), an elastic joint is 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 common to do so. On the other hand, in order to make the engine room more compact, medium-speed diesel engines with long total engine lengths do not use compact planetary reducers.
Furthermore, there has been a proposal to incorporate a different type of fluctuating torque absorbing mechanism into the planetary reducer and to directly connect the main engine and the reducer without using the above-mentioned elastic joint. That is, as shown in FIG. 2, both ends of a rod-shaped body called a balance pin (500) are fixed to both ends in the width direction of the internal gear (1), and the center part is attached to the outer periphery of the internal gear (1). installed external casing (2)
By fixing it to the balance pin (500)
The internal gear (1) is elastically supported by the external casing (2) and has a structure that absorbs the fluctuating torque transmitted from the main engine.

(Problems to be Solved by the Invention) However, the above-mentioned balance pin (500) has its structural limitations (for example, considering its installation position, it is natural to limit the size and shape of its thickness and length, and the number of units that can be installed). Since it is not possible to reduce the torsion spring stiffness because there are some limitations,
The effect of absorbing fluctuating torque by this lever is inferior to that of the above-mentioned elastic joint, and in engines with large torque fluctuations, the balance bin (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 in order to solve the above-mentioned problems, and aims to elastically support an internal gear on an external casing using a method other than a balance bin, thereby achieving simplicity in manufacturing and improvement in absorption of fluctuating torque. It is something.

(Means for Solving the Problems) The configuration of the present invention will be described in detail below. By installing a deformed annular body between the internal gear of the free drive reduction gear and the external casing provided around the deformed annular body, the deformed annular body The internal gear is elastically supported by the external casing using the elastic force generated by the deformation of the entire body.

Among these, the deformable annular body is made of an elastic body such as a thin steel plate or rubber, and is constructed as an integral body that elastically deforms according to the applied load. It has a shape.

(Function) The present invention is similar to a balance bin in that it elastically supports the internal gear of a planetary reducer. By changing the specifications of the deformable annular body, it is possible to select a wider range of torsion spring stiffness. In other words, the elastic force of the deformation of the deformable elastic body makes it possible to absorb large fluctuation torque without using the flywheel effect or increasing the tooth surface strength.

(Embodiment) FIG. 1(a) shows an embodiment of the present invention. In this embodiment, deformation occurs between the side surface (10a) of the internal gear αQ and the vertical wall surface (20a) of the external casing ■. An annular body (40) is inserted to fix the rod between both surfaces (1 oa) (20a). The deformed annular body (40) is composed of a steel cylindrical shell that matches the curvature of the outer peripheral side of the internal gear αQ.
1. It is welded to the side surface (10a) and the vertical wall surface (2Oa).

With this configuration, since the internal gear αOE is elastically supported by the external casing, when the internal gear (G) receives a fluctuating torque via a sun gear (not shown) and a planetary gear (not shown), the deformed annular body (40) remains fixed between the internal gear αQ and the external casing and is screwed in proportion to the applied torque. The elastic deformation caused by the male screw absorbs the fluctuating torque applied to the reducer.

Fig. 1 6) shows another embodiment of the present invention, in which the internal gear has an outer peripheral surface (na) of 0η and an outer casing of 0η.
1) Deformed annular body (41) between the inner peripheral surface (21a) *
The deformed annular body (41) is made of a thin steel plate folded into an accordion shape, and is connected to the internal gear H and the external casing. Since the opposing surfaces (lla) and (2ia) of the ring are parallel to the circumferential direction, the ring is formed into a planar annular shape and bends in the same direction when absorbing vibrations.

With such a configuration, internal gear α[-external casing Q
Since the internal gear is elastically supported by the outer casing Q, when the internal gear receives a fluctuating torque, the deformed annular body (41) is fixed between the internal gear α and the external casing Qη. It will bend. The elastic deformation caused by the deflection absorbs the fc fluctuation torque applied to the reducer.

FIG. 1(c) shows still another embodiment of the present invention,
In this embodiment, as in the previous embodiment, a deformed annular body (42) is inserted between the outer circumferential surface (t2a) of the internal gear (2) and the inner circumferential surface (22a) of the outer casing.
a) It is crimped and fixed between (22a). The deformed annular body (42) is formed into an annular shape because the opposing surfaces (12a) (22a) of the internal gear (6) and the external casing (2) are flat in the circumferential direction, and its material is rubber. is not used.

Due to this configuration, when the internal gear (6) is subjected to a fluctuating torque, the deformable annular body (42) is fixed between the internal gear α and the external casing (A) and is elastically deformed. I will do it.

The elastic force of the deformable annular body (42) absorbs the fluctuating torque applied to the reducer.

(Effects of the Invention) As explained above, according to the configuration of the present invention, the internal gear is elastically supported by the external casing by the deformed annular body, and vibration absorption due to the elastic deformation of the deformed annular body is significant. Compared to an absorption mechanism using an internal balance bin, which is a mechanism built into the planetary reducer, a very high fluctuating torque absorption effect can be obtained, and manufacturing is also easy.

Although the present invention refers only to a reduction gear, it goes without saying that it can also be applied to transmissions in general, such as a speed increaser.

[Brief explanation of the drawing]

FIG. 1(a) is a partially omitted diagram showing one embodiment of the present invention, FIG. 1(b) is an explanatory diagram showing another embodiment of the present invention, and FIG.
) is a partially omitted view showing still another embodiment of the present invention, and FIG. 2 is a perspective view showing a fluctuating torque absorption mechanism in a planetary reducer using a balance pin. In the figure, (1) α1 (11) (6) are internal gears, (2) H
0η (A) is the external casing, (40X41X42
) indicates a deformed annular body, and (500) indicates a balance pin.

Claims (1)

[Claims] Internal gear and external cage installed around it from a thin steel plate or an elastic body between the The feature is that a deformed annular body is attached. Fluctuation torque absorption in a planetary reducer with mechanism.