JPS60205045A - Planetary gears mechanism - Google Patents

Abstract

PURPOSE:To improve the stabilization of rotation in a gear shaft and suppress its vibration and noise, by forming the gear shaft of a sun gear into a flexible shaft. CONSTITUTION:A planetary gears mechanism, in which a gear shaft 1 integrally rotates while supporting a sun gear 2, arranges the sun gear 2 in almost the center of an internal gear 3 and a plurality of planet gears 4 at a suitable space along the direction of rotation mutually between these gears 2, 3. The gear shaft 1, supporting the sun gear 2, is formed by a flexible shaft, and the gear shaft 1 composed of the flexible shaft is fixedly supported in a fixed position by a bearing member 5. The ring-shaped bearing member 5, being held by a bearing to a casing 7, is fixed to planet frames 8, which transmit power while supporting the planet gears 4, and the gear shaft 1 is supported by a bearing in a fixed position through these frames 8 for a fixed system.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a planetary gear mechanism, and in particular, improves stability of rotation of a sun gear and a gear shaft that supports the sun gear and rotates integrally with the sun gear, thereby reducing vibration and vibration. It relates to a planetary gear mechanism that can reduce noise, etc. and improve reliability.

[Full back cover of the invention and its problems] Generally, as shown in Fig. 3, a planetary gear mechanism has an internal gear a.
and a sun tooth gi located approximately in the center of this internal gear a.
b, and a plurality of planetary gears C that are meshed with these gears a and b and rotate around the sun gear, and for example, when power is input from the planetary gear C side. , each lli gear C distributes the power equally and transmits it to the sun gear for output.

Conventionally, the gear shaft d, which supports the sun gear and is integrally driven to rotate and transmit power, is supported in a substantially flowing state. Specifically, since a clutch or the like is generally interposed between the gear shaft d that transmits power and the driven object, one end of the gear shaft d is connected to the driven object by the connection of the clutch, etc. The other end has a ball that revolves around it!
4! It is supported by gear C. Supporting the gear shaft d in a substantially footing state equalizes the tooth surface pressure between the sun gear and each planetary gear C when outputting power to the driven object. This is a necessary configuration to enable equal power transmission from the sun gear to the sun gear. That is, when the tooth surface 1f force with the - planetary gear C is high and the tooth surface pressure with other planetary gears C is low, the sun gear can be moved from the side with higher tooth surface pressure to the side with lower tooth surface pressure. Each i star tooth it C
This achieves equal load distribution between the gear and the sun gear.

However, the conventional method has the following problems.

■ Since the gear @d is supported in a substantially floating state between the driven object and the planetary gear C, the gear shaft d becomes free when the clutch or the like is disengaged.

In this disengaged state of the clutch, etc., the gear shaft d is idled in a non-negative state due to the sun gear being sent to the teeth of the planetary gear C, and the gear shaft d rattles without positioning and generates vibrations and noise. There is a risk that I will scream.

■ Also, since the gear shaft d is supported in a floating manner, a ring member e is fitted onto the gear shaft d in order to restrict the axial movement of the gear shaft d, but there is a gap for the purpose of smoothing the ring member e. There is a risk that vibrations in the axial direction will occur regardless of whether the engine is idling or transmitting power.

■ Also, when the clutch, etc. is disengaged, the gear shaft d becomes free and roars, so a flexible joint is interposed between the fixed clutch, etc. and the gear shaft d, but this flexible joint itself becomes a source of vibration, In addition, when the moving horn is transmitted, this flexible joint may restrict the movement of the sun tooth center and prevent equal load distribution.

[Objective of the Invention 1 The present invention was proposed fj1 in view of the above-mentioned problems, and its purpose is to improve the stability of the rotation of the gear shaft of the sun tooth Ll and (), thereby reducing vibrations, noise, etc. The purpose of the present invention is to provide a gear mechanism that can reduce friction and improve reliability.

[Summary of the Invention] According to the present invention, the above object is achieved by the following configuration.

That is, in order to support the sun gear so that it can move in the radial direction, the gear shaft of the sun gear is formed of a flexible shaft, and the gear shaft formed of the flexible shaft is rotatably fixed with a bearing mu. It is made up of support.

[Embodiments of the Invention] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

First, the basic configuration will be explained according to FIG.

As shown in the figure, 1 is a gear shaft that supports the sun gear 2 and rotates integrally with the sun gear 2. The sun gear 2 is disposed approximately at the intermediate position of the internal gear 3, and a plurality of planetary gears 4 are disposed at appropriate intervals along the rotational direction between the gears 2 and 3 phase 7i.

The above configuration is substantially the same as the conventional one.

The feature of the present invention is that the gear shaft 1 that supports the sun gear 2 is formed of a flexible shaft, and the gear shaft 1, which serves as the flexible shaft, is fixedly supported at a fixed position by a bearing member 5. It's what I did.

In order to provide flexibility to the gear shaft 1, measures such as making the shaft diameter smaller than the shaft length or setting the shaft length longer than the shaft diameter are taken from the relationship between the shaft length and the shaft diameter. be able to. Furthermore, forming a hollow portion 6 inside the shaft 1 can also be taken as an auxiliary means for flexibility. Another possibility is a change in the quality of the moon.

However, the gear shaft 1 also functions as a power transmission shaft and has considerable torsional rigidity, and by taking the above points into consideration, the iJI flexible shaft of the gear shaft 1 can be achieved.

Particularly in the case of an M star gear mechanism, it is important to equally distribute the load on the planetary gear 4, and the flexibility of the sun gear depends on the amount of power transmitted from each free tooth f18 rJ14 (i.e. the level of tooth surface pressure). 2 can be moved in the radial direction (toward the 'iIi star gear 4 side) to achieve equal load distribution.

In this embodiment, the gear shaft 1 extends integrally with the sun gear 2 along its axial direction. The shaft diameter is small relative to the shaft length, except for both ends 1a and 1a, which are far away from the sun gear 2 and are bearing, and the sun gear portion. Further, a hollow portion 6 is formed in the gear shaft 1 so as to extend through the shaft center portion thereof in the axial direction.

Both ends 1 of the gear shaft 1 of the sun gear 2 configured in this way
a and 1a are each rotatably and fixedly supported at a fixed position by a bearing member 5.

In this embodiment, the ring-shaped bearing member 5 is supported by a casing 7 serving as a fixed system, and T! It is fixed to a planetary frame 8 that transmits power while supporting the circular teeth 1114, and is constructed so that the gear shaft 1 is supported at a fixed position with respect to the fixed system via these planetary frames 8'8.

With this configuration, the bearing member 5 has a double-supported structure, and the rotational stability of the gear shaft 1 and the sun gear 2 can be constantly improved regardless of whether the clutch or the like is engaged, and vibration and noise can be suppressed. . In this case, since both ends 1a and iat' gear shaft 1 are positioned, vibration in the axial direction can also be suppressed. Also, both ends 1a.

By fixedly supporting 1a, it is possible to eliminate the need for a flexible joint or the like between the clutch and the clutch, thereby making it possible to further stabilize the rotation.

As described above, by adopting a flexible shaft, gear shaft 1 is fixedly supported while ensuring equal distribution of M1, so it is possible to improve the rotational stability of sun gear 2 and gear shaft 1, and It is possible to improve the reliability of the planetary gear mechanism by removing the adverse effects of these parts by removing parts (such as flexible shafts).

In the above embodiment, the gear shaft 1 is supported at both ends, and the sun gear 2 is formed at the substantially middle position of the gear shaft 1, thereby making it possible to obtain sufficient movement of the sun gear 2 while ensuring torsional rigidity. ing.

As an application example of the above basic embodiment, FIG. 2 shows a case in which it is applied to a specific device. This device is called a spindle drive power generator.

This device uses a gear mechanism 10 to take out a part of the driving force from a rotating shaft 9 that is rotationally driven by an IvA or the like and transmits the driving force, and applies it to a driven shaft 11, which drives auxiliary equipment 12 connected to this. It is. According to this device, it is possible to eliminate the prime mover and the like that were conventionally required to drive only auxiliary equipment, and it is possible to simplify the equipment and reduce running costs.

For example, in recent years, a system has been developed in which a portion of the driving force is extracted from the rotating shaft 9 of a marine engine to drive the engine 113 and the like.

In particular, the generator 13 is required to be rotated at a constant speed in order to obtain a constant frequency.On the other hand, in a marine engine, the rotation speed is not constant and fluctuates frequently.
A constant speed means 14 composed of a foot gear mechanism is provided. The power generator 1113 is rotated at a constant speed using part of the driving force to drive the steam turbine 15 and the like.

Note that 1G is a clutch such as an air clutch or a hydraulic clutch.

The 'it1 leg gear Isosu according to the present invention is employed as the constant speed means 14. In this application example, the differential 3!2 star gear machine (
14 and 48 are formed on the outer periphery of the internal tooth I$i3, which is rotated to increase or decrease the revolution speed of the planetary gear 4. A differential control gear 1 that makes the output rotation speed of the sun gear 2 constant
7 is engaged. The differential control gear 17 supplies hydraulic oil in the opposite direction depending on whether the speed detected from the rotation speed detection gear 18, which rotates synchronously with the driven shaft 11, is higher or lower than the set rotation speed. The motor 20 is rotated in the forward and reverse directions by the pump 19, and functions to perform the differential control described above.

A concrete (14-structure) is shown in FIG. 1, and the same reference numerals are given to the same constituent members as in the above basic embodiment.

Note that 21 is a power output shaft 22 (second
This gear 21 is integrally fixed to a sleeve-shaped planet frame 8, and the planet frame 8 has a support shaft 2.
3, '11 star tooth Φ4 is rotatably supported.

However, as in this application example, due to space and layout issues, there are cases in which a long shaft system is constructed from the gear shaft 1 to the turbine 15, and it is also necessary to connect air piping directly to the clutch 16 from the outside. There are times when I cannot connect.

Therefore, it is conceivable to avoid penetrating the gear shaft 1 and form a supply passage for air, hydraulic oil, etc. to supply and discharge air and hydraulic oil to and from the clutch 16, but with the conventional floating-supported gear shaft 1, positioning is not possible and displacement occurs due to engagement and engagement of the clutch 16. This requires flexible piping, which may cause problems such as abnormal vibration of the piping.

On the other hand, in the present invention, the 61ilIi axis 1 position n
Since it can be fixed, air and hydraulic piping can be directly connected 8, increasing the degree of freedom in space rapping and layout. In this case, it is recommended to use the hollow portion 6 formed in the above basic example to supplement flexibility as a pipe.

Furthermore, being able to independently support the gear shaft 1 at a fixed position allows for arbitrary selection of the structure and type of the clutch, etc.1)! '7
It will be decided.

In this case, since the gear shaft 1 is a flexible shaft, it goes without saying that there is no adverse effect on the load distribution.

By employing such a planetary gear mechanism according to the present invention, it is possible to improve the reliability of various types of appliances to which the planetary gear mechanism is applied, and to simplify and streamline construction.

[Effects of Brahma] In summary, the present invention exhibits the following excellent effects.

(1) Since the gear shaft of the sun gear is fixedly supported in a fixed position by a bearing member, the sun gear width and rotational stability of the gear shaft are improved compared to the conventional floating state support. Vibration and noise can be suppressed.

(2) By making the gear shaft a flexible shaft, the b sun gear can be moved while the gear shaft is fixedly supported, and load distribution with the planetary gears can be ensured.

(3) Therefore, reliability as a planetary gear mechanism can be improved.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a preferred embodiment of the present invention, FIG. 2 is a perspective view showing the state of application to a main shaft drive generator, and FIG. 3 is a side sectional view showing a conventional example. In the figure, 1 is a gear shaft, 2 is a sun gear, and 5 is a bearing member. Patent applicant: Ishikawa A Harima Handicrafts Co., Ltd. Representative Patent Attorney
Nobuo Kinuya

Claims (1)

[Claims] In order to support the sun gear movably in the radial direction, the gear shaft of the sun gear is formed of a flexible shaft, and the toothed ψ axis formed of the flexible shaft is fixedly supported rotatably by the bearing part. The planetary gear m structure is characterized by the following.