KR20070047702A - Supporting structure of planetary rotating body - Google Patents

Abstract

It does not require complicated flanged body, it is flexible to change design in low cost, and shake does not occur even if the tightening force of bolt is slightly decreased by long-term use. Obtain the supporting structure of the planetary rotor.

A pair of first and second flange bodies 66 and 68 are arranged on both sides of the planetary gear 56 in the axial direction and connected to each other via the connecting member 70, and at least one of the first and second flange bodies 66 and 68 is disposed. Torque in the circumferential direction between the flange 66 and the connecting body 70 is transmitted by the frictional force. The planetary gear 56 has a pair of first and second support pins 62 and 64 protruding from both axial sides thereof, and at least one of the pair of support pins 66 and 68 has a first plan. It is fixed with the fitting structure which has a fastening margin with respect to the support body 66.

Planetary rotors, planetary gears, planetary rollers, torque, flanges, support structures

Description

Supporting structure of planetary rotating body

1 is an overall cross-sectional view showing an example of a planetary gear device to which the present invention is applied;

2 is an overall sectional view showing an example of a conventional planetary gear device;

3 is an overall sectional view showing another example of the conventional planetary gear device.

Explanation of symbols on the main parts of the drawings

PG2: Planetary Gear

50: joint axis

54: sun gear

56: planetary gear

58: internal tooth gear

60: casing

62: first support pin

64: second support pin

66: first flange body

68: second flange body

70: connector

72: screw hole

74: through hole

76: bolt

78: Needle Bearing

80: output shaft

The present invention relates to a supporting structure of a planetary rotor such as a planetary gear or a planetary roller.

In planetary gear units used for precise positioning of liquid crystal transfer robots and ATC, a planetary gear whose restraint or support of its circumferential position is provided by a carrier. . The carrier is often constituted by a cage-type member (carrier body) in order to be compact and to increase rigidity.

2 shows a planetary gear device PG1 disclosed in Patent Document 1. As shown in FIG.

The planetary gear device PG1 includes two planetary planetary gear mechanisms P1 and P2. Of these, the planetary gear mechanism P2 at the rear end has a sun gear 2, a planetary gear 4, and an internal tooth gear 6, and is supported by the planetary gear 4. The pin 10 protrudes in the axial direction, and is supported by the pair of flange portions 14 and 16. The pair of flange portions 14 and 16 are each constituted by a single (same) member as part of the carrier body 8 to form a cage shape.

In this configuration, the shape of the carrier body 8 becomes extremely complicated, so that the cost is easily increased, and the flexibility of design change is low even when the reduction ratio and the transmission capacity are changed. Therefore, the planetary gear device PG2 constructed as shown in Fig. 3 is also widely known. The planetary gear device PG2 comprises a pair of flange bodies 30 and 32 as separate members, and uses a connecting body 34 and a bolt 36 which are integral with the flange body 32. Thus, both of them 30 and 32 are integrated.

In such a configuration, since the bolt 36 and the through hole 33 of the flange body 30 are not completely integrated in the circumferential direction (there is a slight gap), the flange body 30 and The torque in the circumferential direction between the coupling bodies 34 is determined by the first flange body (pushing force) generated in the end portion 34A of the coupling member 34 by the fastening force of the bolt 36. 30) It is delivered to the side.

[Patent Document 1] Japanese Patent Application Laid-Open No. 09-303494

However, in the case of the structure shown in FIG. 3, since the torque in the circumferential direction between the flange 30 and the connection body 34 is transmitted through frictional force, the clamping force of the bolt 36 by long use is used. If the friction force cannot be maintained due to the loosening or the torque of the friction force, or the like, there is a problem that the torque is transmitted by the "shear stress" of the bolt 36. . When the torque transmission is performed by the shear stress of the bolt 36, it is shaken by the gap existing between the bolt 36 and the through hole 32 when the load is changed or the rotation direction is reversed. There is a risk of flickering.

The present invention has been made to solve such a conventional problem, and does not require a carrier body of a complicated shape, has flexibility in design change with a low cost, and provides torque transmission by long-term use. Even if the friction force in charge cannot be secured, it is a problem to provide a support structure for a planetary rotor that does not cause shaking or the like.

In the present invention, a pair of flange bodies connected to the axially opposite sides of the planetary rotating body via a connecting body are disposed, and a torque in the circumferential direction between at least one flange body and the connecting body is provided. (A) In the support structure of a planetary rotor having a structure transmitted by frictional force, the planetary rotor has a pair of support pins protruding from both sides in the axial direction, and at least one of the pair of support pins The said subject is solved by employ | adopting the structure fixed by the fitting structure which has a fastening margin with respect to the said flange body.

In the present invention, in the support structure of the planetary rotating body in which the circumferential torque between the flange and the connecting body is transmitted by frictional force, the planetary pin is fitted with a fitting structure having a fastening margin. It is fixed to the flange. Here, the term "fitting structure with tightening allowance" means a fitting structure in which a gap does not occur at all even though there is a manufacturing error (but there is a tightening allowance).

Therefore, in addition to the frictional force of the contact portion between the connecting body and the flange body, the connecting body and the flange body are connected in a state in which torque transmission is possible by the shear stress of the planetary pin, and the tightening force of the bolt is slightly lowered. Even if it does, it will be possible to maintain complete integration without causing any shaking or the like. In addition, since the two flange bodies are always integrated in a stable state, the loosening of the bolts is unlikely to occur, and the effect that the frictional force of the connecting portion can be maintained for a long time is also obtained.

In addition, the "fixing by the fitting structure which has a fastening allowance" as used in this invention includes methods, such as a press fit and shrink fit.

In addition, the "pair of support pins" referred to in the present invention are protruding from both sides of the center planetary rotor, respectively, and are not necessarily the same as the concept of the invention. You may comprise with one pin which penetrates.

Best Mode for Carrying Out the Invention

EMBODIMENT OF THE INVENTION Hereinafter, an example of embodiment of this invention is described in detail based on drawing.

1, the whole cross section of the planetary gear apparatus to which the support structure of the planetary rotor which concerns on this invention was applied is shown.

This planetary gear device PG3 has a joint shaft 50 at its front end. The joint shaft 50 is provided with the through hole 52, and the motor shaft of the motor which is not shown in figure at one end side of this through hole 52 is insertable. Reference numeral 54 in FIG. 1 denotes a clamp (friction coupling part) for connecting the joint shaft 50 and its motor shaft to a power transmission possibility. On the other end side of the through hole 52 of the joint shaft 50, a pinion shaft 53, in which the sun gear 54 serving as the input shaft of the simple planetary gear mechanism P3 is formed, is press-fitted. . The simple planetary gear mechanism P3 includes the sun gear 54, a planetary gear 56 that meshes externally with the sun gear 54, and an internal tooth 58 with which the planet gear 56 meshes internally. ). The internal gear 58 is integrated with the casing 60.

The planetary gear 56 includes first and second support pins 62 and 64 protruding from the planetary gear 56 in both axial directions. However, specifically, these first and second support pins 62 and 64 are composed of one member penetrating the planetary gear 56. The first and second support pins 62 and 64 are supported by a pair of first and second flange bodies 66 and 68 disposed on both sides of the planetary gear 56 in the axial direction. The first and second flange bodies 66 and 68 are supported by the casing 60 via the bearings 71 and 73, respectively.

On the other hand, in this embodiment, the connecting body 70 integrally protrudes from the second flange body 68. The screw hole 72 is formed in the connecting body 70, and the through hole 74 is formed in the first flange body 66, respectively. The bolt 76 is screwed into the screw hole 72 through the through hole 74, whereby the first flange body 66 and the second flange body 68 are integrated through the connecting body 70. . The bolt 76 and the through hole 74 of the first flange body 66 are not completely in contact with each other. Therefore, in the normal use state, the coupling between the connecting member 70 and the first flange 66 is not joined by the shear stress of the bolt 76 but by the fastening force of the bolt 76. This is realized by the frictional force generated on the surface S.

In this embodiment, both the 1st support pin 62 of the planetary gear 56 at the side of the 1st flange body 66, and the 2nd support pin 64 at the side of the 2nd flange body 68 provide a fastening margin. The branches are fixed to the first flange body 66 and the second flange body 68 by "pressing" as a fitting structure, respectively. In addition, the second flange body 68 is integrated with the output shaft 80.

However, the planetary gear 56 is attached to the large diameter portion 57 between the first and second support pins 62 and 64 via the needle bearing 78. Therefore, even if the first and second support pins 62 and 64 are press-fitted to the first and second flange bodies 66 and 68, the planetary gear 56 is moved around the large diameter portion 57. It can rotate extremely smoothly.

Next, the operation of the planetary gear device PG3 will be described.

When the joint shaft 50 is rotated by the rotation of the motor shaft (not shown), the pinion shaft 53 pressed into the joint shaft 50 rotates, and is formed at the tip of the pinion shaft 53. The sun gear 54 rotates. In this embodiment, since the internal gear 58 is fixed by being integrated with the casing 60, the sun gear 54 rotates while the planetary gear 56 rotates by the rotation of the sun gear 54. Orbit around. This idle component is transmitted to the first and second flange bodies 66 and 68 through the first and second support pins 62 and 64, respectively, so that the first and second flange bodies 66 and 68 are integrated. Rotate the enemy.

Here, in this embodiment, since the 1st, 2nd support pins 62 and 64 are all fixed by the fitting structure which has a fastening margin to the 1st, 2nd flange body 66, 68, In addition to the frictional force generated by the bolt 76, the first and second flange bodies 66 and 68 are integrated by the shear stresses of the first and second support pins 62 and 64, for example, the bolt 76. Even if the frictional force by) decreases slightly, and even if the torque to be transmitted is increased or decreased or reversed, torque transmission without shaking is possible.

Furthermore, it was also confirmed that the speed itself at which the fastening force of the bolt 76 is lowered is later than conventional. In the related art, when the clamping force of the bolt 76 is lowered, and the shaking occurs somewhat by the magnitude of the load, the shaking acts in the direction of promoting the relaxation of the bolt 76. According to the present invention, it is assumed that the occurrence of shaking itself is suppressed by the action of the first and second support pins 62 and 64 when the fastening force of the bolt 76 is slightly reduced.

Since the two flange bodies 66 and 68 are formed by separate members, respectively, the shape is relatively simple and can flexibly cope with various design changes. The press-fitting with a tightening margin has almost no cost increase in itself, and thus, the durability of the planetary gear device PG3 can be greatly increased than in the prior art only by changing the design of the extremely simple and low cost.

In addition, in the said embodiment, although the 2nd flange body 66 and the connection body are integrated, both of the 1st, 2nd support pins 62 and 64 are made into the 1st, 2nd, respectively, focusing on prevention of shake. 2 flanges 66, 68 were fixed by a fitting structure having a tightening allowance. However, for example, in the case where one flange body is integrated with the connecting body from the main body as in this embodiment, for example, the flange body of the integrated side has high rigidity, and thus does not have a tightening margin. You may employ | adopt the structure which engages by embedding. The structure which combines this one side by the "insertion structure which does not have a fastening space" is a rational structure in that both "prevention of shaking" and "securing ease of installation" are made compatible. However, the concept of "insertion structure without tightening allowance" as used herein includes the concept of a fitting structure in which the tightening allowance is less than a manufacturing error, in addition to the fitting structure in which the tightening allowance is negative (there is a gap) or zero. .

In addition, even in the case where the connecting body is formed separately from the second flange body and both the first and second flange bodies are coupled to the connecting body by frictional force, the design request indicates that "ease of installation is easy." Or "preventing shaking" may be the indentation structure of only one side or the indentation structure of both sides.

In the above embodiment, the present invention is applied to the support of the planetary gear which is a planetary rotating body of the simple planetary gear mechanism. However, the present invention is not only a simple planetary gear mechanism, but, for example, the central axis of the planetary gear apparatus is planetary. The present invention can also be applied to support of planetary gears in a so-called swinging inwardly engaged planetary gear mechanism inside the gear. Furthermore, the present invention can be applied to a planetary roller as a planetary rotating body of the planetary roller mechanism in addition to the gear mechanism.

[Industry availability]

It is similarly applicable to the planetary apparatus of the structure which has a pair of flange bodies as a carrier on both sides of a planetary rotating body, and has a structure which makes at least one of these flange bodies and a connection body torque-transfer by frictional force.

The planetary rotating body does not require complicated flanges and has low flexibility in design change, and even if the bolt's tightening force is slightly decreased due to long-term use, it does not shake. A support structure can be obtained.

Claims (3)

A pair of flange bodies connected to both sides of the planetary rotating body via the connecting body are arranged, and the torque in the circumferential direction between the at least one flange body and the connecting body In the supporting structure of the planetary rotor having a configuration that is transmitted by the frictional force, The planetary rotor has a pair of support pins protruding from both sides in the axial direction, and at least one of the pair of support pins is fixed to the flange body by a fitting structure having a fastening margin. A support structure for a planetary rotor, characterized in that. The method according to claim 1, The planetary rotating body is fixed to both of the pair of flange bodies by a fitting structure having a fastening allowance through the pair of supporting pins. The method according to claim 1, The support structure of the planetary rotor according to claim 1, wherein one of the pair of support pins of the planetary rotor is coupled to a corresponding flange by a fitting structure without fastening margin.

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