JPH07117127B2 - Planetary gear - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planetary gear device capable of reducing backlash.

[0002]

2. Description of the Related Art A gear device used for transmission of rotation of a servomotor, driving of a precision machining machine, etc., has a function of increasing, decelerating, and transmitting a rotation, and has its rotation accurately loaded without load. It is necessary to communicate. In the gear device used for such an application, it is required to reduce the backlash between the gears. For this reason, various proposals have been conventionally made as follows. Gears are selected according to the tooth thickness and combined so that the backlash is minimized. Adjusting the distance between the centers of gears. One of the meshed gears is a split gear divided in the axial direction, and one of the split gears is fixed to the other by an angle deviation in the rotation direction and fixed by a fixing means such as a bolt. One of the meshing helical gears is a split gear divided in the axial direction, and one of the split gears is axially displaced with respect to the other and is fixed by a fixing means such as a bolt. A pair of gears whose tooth thickness is changed in the axial direction by changing the amount of dislocation in the axial direction and the like, in which the changing direction is reversed and the relative position is adjustable in the axial direction.

On the other hand, a planetary gear device is often used as a gear device because of its characteristics that the input and output shafts are concentric, compact and lightweight. However, any of the above-mentioned proposals can be adopted in a gear device that does not have a revolving gear, and includes a revolving planetary gear and a planetary gear that revolves inside the internal gear, and a planetary gear In a planetary gear device that simultaneously meshes with an internal gear and a sun gear, the entire device must be disassembled for adjustment due to wear of the gear due to use, and it is hardly possible to employ it as it is.

In addition, the proposal also requires high precision gears, requires a great deal of labor for measurement, selection, etc., and reduces backlash due to oil escape during meshing during operation. However, it is not possible to use it in a planetary gear device having a relatively large number of gears, because it has a problem that the increase in backlash due to wear after long-term use cannot be adjusted.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a planetary gear device which can adjust the backlash and reduce the play between the input and output shafts.

[0006]

The present invention provides a sun gear, an internal gear concentric with the sun gear, and the sun gear and the internal gear pivotally supported by a carrier extending from a rotary shaft concentric with the sun gear. A planetary gear that meshes with the internal gear, and the internal gear is composed of first and second internal split gears that are axially divided,
And the planetary gear is divided in the axial direction, and the first and second
First and second planetary split gears that mesh with the internal split gears
In addition to the above, a lever protruding through the hole provided in the case to the outside of the case is provided.
A planetary gear device comprising angle setting means for adjusting another relative angle with respect to one of the second inner split gears.

[0007]

The internal gear I and the planetary gear P are axially divided to engage the first and second internal divided gears Ia and Ib and the first and second planetary divided gears Pa and Pb. Further, one of the first and second internal split gears Ia and Ib is relatively rotated by the angle setting means. As a result, the first and second planetary split gears P
The teeth of the first and second planetary split gears Pa and Pb are the tooth flanks of one tooth of the sun gear S, and the tooth flanks of which one tooth groove is sandwiched due to the relative offset of a and Pb. Can reduce the backlash. Moreover, each first and second
The planetary split gears Pa and Pb have a gap corresponding to the amount of backlash on the side opposite to the meshing surface with the sun gear S. In this way, it is possible to reduce the backlash while maintaining the space for escape of oil. Also by the angle setting means, also Zukeru near the backlash to 0, a little of hope back
It can be adjusted freely by adding a rush. Further angle
The setting means swings the lever protruding to the outside of the case.
Because the is intended for adjusting the relative angle, even after assembly and during operation, regardless of the stopped to allow for the adjustment.

[0008]

EXAMPLES 7-9, a sun gear S, a ring gear I, shows the basic configuration of the planetary gear device having a planetary gear P that will be pivoted to the carrier C, to fix the internal gear I Figure 7 flop Raney <br/> Tari type, 8 solar type with a fixed sun gear S, carrier
9 with a fixed Ya C are star commonly called, the planetary gear unit 1 of the present invention, the planetary gear equipment planetary type 7
Can be used for. 1 and 2 and FIG. 6, which shows a conceptual diagram, show an embodiment of the present invention.

The planetary gear device 1 has a sun gear S, an internal gear I, and a planetary gear P pivotally supported by a carrier C. The internal gear I and the planetary gear P are axially divided. By doing so, the first and second internal division gears Ia and Ib, the first and second internal gears
The planetary split gears Pa and Pb are formed, while the internal split gears Ia and Ib are provided with angle setting means 3, and the gears S, I and P are respectively housed in the case 10.

The case 10 has a case body 14 having a central cylindrical portion 12 integral with the legs 11, and a rear cylindrical portion 16 arranged on the input side thereof and concentric with the central cylindrical portion 12.
And a front bracket 17 that closes the output side of the case body 14.

In this embodiment, the sun gear S is formed integrally with a first shaft 20 which is, for example, an input shaft, and the carrier C is concentric with the first shaft 20 and pivotally supported on the front bracket 17. For example, it is formed by using the second shaft 21 which is an output shaft.

The second shaft 21 has a protruding portion 23 protruding from the front bracket 17 and a supporting portion 24 connected to the protruding portion 23.
And a large-diameter boss portion 26 connected to the support portion 24 via a step 25, and the boss portion 26 bulges outward in the radial direction in the form of a collar and swells to form the carrier C. Part 2
9 and a recess 30 is formed at the rear end.

The second shaft 21 is pivotally supported on the support portion 24 by contacting the step 25 with the rear bearing 32 by two front and rear bearings 32, 32 provided in the hole of the front bracket 17. A collar is provided between the bearings 32, 32 so as to be in contact with the outer ring of the bearings 32, 32, and the front bracket 17
A front cover 33 bolted to and having a seal,
The outer ring of the bearing 32 located on the front side can be held.

The first shaft 20 moves the sun gear S through a protrusion 35, a support portion 36 connected to the protrusion 35, and a joint portion 39 connected to the support portion 36 via a step 37. A gear part 40 is provided, and a receiving part 43 to which a bearing 42 provided in the recess 30 at the rear end of the second shaft 21 is attached is provided at a small joint part. Further, the first shaft 20 has the support portion 36.
Is supported by a bearing 44 provided in the hole portion of the rear case body 15, so that the output shaft 2 is supported by the bearings 42 and 44.
Supported concentrically with 1.

[0015] On a rear surface of your rear casing 15, bolted cover 46 after having One only press seal outer ring of the bearing 44. Further, the bearing 44 contacts the input shaft 20 and the output shaft 21 when the inner ring contacts the step 37.
And are supported by bearings 32, 42 and 44 so as to be immovable in the axial direction.

[0016] The carrier C has said bulging portion 29 of the output shaft 21, and pivotally support said Yu Hoshiha vehicle P the bulge portion 29
A plurality of support pins 51, a plurality of coupling pins 52 which Rutotomoni color <br/> over 60 extending in the axial direction is extrapolated disposed between the support pin 51 extending respectively axially rearward from the support At the rear end of the pin 51 and the coupling pin 52, the support ring 53 is arranged so as to sandwich the planetary gear P. The support pin 51 includes a fixing portion 57 that is inserted into the bulging portion 29 at an equal angular pitch and is screwed to the front end of a pivot portion 55 that pivotally supports the planetary gear P via a flange.

The connecting pin 52 is inserted through the center hole of the collar 60 which separates the bulging portion 29 and the support ring 53, and the collar 60 is provided at the front and rear ends of the base portion 61, respectively. A small-diameter insertion portion 64 that fits into the bulging portion 29 and a small-diameter insertion portion 65 that fits into the support ring 53 are provided through the step, so that the coupling pin 52 is screwed through a large-diameter washer. By doing so, the bulging portion 29 and the support ring 53 are firmly fixed together. Further, by inserting the rear end of the pivotal support portion 55 of the support pin 51 into the hole of the support ring 53 and bolting the support pin 51, the support pin 51 can be firmly fixed in the axial direction before and after the support pin 51 and at an equal angular pitch.

In this embodiment, the planetary gear P pivotally attached to the pivot portion 55 of the support pin 51 is composed of planetary split gears Pa and Pb which are axially divided with the same width and have the same gear specifications. The sun gear S provided on the first shaft 20 together,
Each meshes on the inside in the radial direction. Also, planetary split gears Pa, P
b is meshed with the internal gear I on the outer side in the radial direction, and this internal gear I is axially divided into two as internal divided gears Ia and Ib having the same gear specifications, and the internal divided gear Ia is a planetary gear. The split gear Pa and the inner split gear Ib mesh with the planet split gear Pb, respectively.

[0019] The inside split gear I a, the front SL after the case body 1
5 is formed on the inner surface of the cylindrical portion 16 and the inner peripheral surface of the inner peripheral ring portion 70 extending inward at the front portion. It can be formed integrally with the rear case body 15 or as a separate ring-shaped body fixed to the rear case body 15 by appropriate means, and the internal divided gear Ia constitutes a stationary internal gear. On the other hand, the inner divided gear Ib is formed on the inner peripheral surface of the adjusting ring 71 in which the angle setting means 3 capable of adjusting the relative angle with respect to the inner divided gear Ia is formed.

The adjusting ring 71, the inner peripheral-ring 7 0
If, within the split gear ring and the inner circumferential surface that fits fits in a circumferential groove between the other of the inner peripheral ring portion 72 which projects from the inner surface and the rear portion of the cylindrical portion 12 of the to case body 14 inwardly A base ring 74 provided with Ib, and radially outward from the outer peripheral surface of the base ring 74
And a lever 75 protruding outward from the outer peripheral surface of the case 10 through a notched long groove-shaped hole 76 provided in the case 10. In addition, the adjusting ring 71 has a seal ring 79 on the outer peripheral surface and both side surfaces of the base ring 74 sandwiching the lever 75.
By interposing ...., the case 10 and the case 10 are axially sealed and the leakage of the lubricant therein is prevented.

In the present embodiment, the angle setting means 3 comprises the lever 75 and an adjusting fitting 90 for adjusting the lever 75 to swing in the circumferential direction.

The adjustment fitting 90 is provided with a screw shaft 94 pivotally supported by a bearing portion 93 protruding from the cylindrical portions 12 and 16 of the case 10 or the leg 11 and a head through which the screw shaft 94 is inserted. A shaft portion 96 supported by the lever portion 75 on the portion 95.
The rocking hardware 97 provided consists nuts 99, 99 Metropolitan screwed to the screw shaft 94 on both sides of the head 95, the
By tightening the one nut 99 threadedly advance to and nut 99 of the other hand, the lever 75 can be swung adjusted in the circumferential direction together with the screw forward and backward. The shaft portion 96 of the rocking hardware 97 is
After being adjusted, the nut is tightened and fixed by the nut 100.

As the angle setting means 3, in addition to the one using the adjusting metal fitting 90, as shown in FIGS. 4 and 5, for example, a protruding piece 101 protruding from the case 10 is provided, and the lever 75 and the protruding piece 101 Long hole 102 on one side
And a bolt passing through the long hole 102 is used.
Te, the adjusting levers 75 at an appropriate angle, such as to fix, as long as capable of oscillating the lever 75, can be utilized various means. Further, as shown in FIGS. 4 and 5, for example, the boss portion 104 can be extended to one of the planetary split gears Pa and Pb and the other can be pivotally attached to the boss portion. The planetary gear P is pivotally attached using an appropriate bearing.

[0024] In Yu Review gear 1, the angle by setting means 3, the adjusting ring 71, the inner split gear Ib via the lever 75, the other fixed inner dividing gear Ia
Rotate relative to. The result is shown in FIG. 2 in the left half thereof, the inner split gear 1a and the planetary split gear Pa.
The right half of the mesh with the internal split gear 1b and the planet split gear P
The engagement with b is shown. It should be noted that in the figure, the teeth that are not meshed are omitted.

FIG. 3 schematically shows the sun gear S, the internal split gear Ia and the planet split gear Pa meshing with it by a solid line, and the other internal split gear Ib and the planet split gear Pb meshing with it by a one-dot chain line. . As is apparent from FIG. 3, the planetary split gear Pb rotates by α ° due to the relative rotation of the internal split gear Ib, and as a result, the internal split gear Ia and the internal split gear Ib are opposite to the planet split gears Pa and Pb, respectively. Tooth surface T
The planetary split gear Pa and the planetary split gear Pb mesh with the sun gear S at, for example, tooth surfaces Ts1 and Ts2 opposite to each other, for example, between the gears a and Tb. The backlash that occurs can be reduced, and the play caused by the backlash between the gears of the planetary gear device 1 can be reduced.

When setting by the angle setting means 3,
When the planetary gear device 1 has a rotation direction that is mainly used, the internal divided gear I that is stationary with respect to the rotation direction is used.
a, the planetary split gear Pa is adjusted to mesh with each other for force transmission. Further, the internal divided gears Ia and Ib, the planetary divided gear P
When one of a and Pb is set to have a small width for removing backlash, it is adjusted in the same direction.

The planetary gear device of the present invention can be used not only as a so-called acceleration / deceleration unit, but also as a motor with various motors integrally incorporated. Further, the planetary split gears Pa and Pb, which are further split in the axial direction, are provided with separate support pins 5
It can also be pivotally supported by 1. Further, as the angle setting means, a lever is rotated by a worm wheel or a worm, a lever is rotated through a link using a screw , or a spring is used to swing the lever. The planetary gear device of the present invention can be modified in various ways.

[0028]

As described above, the planetary gear device of the present invention uses the internal divided gears Ia, Ib and the planetary divided gears Pa, Pb obtained by axially dividing both the internal gear I and the planetary gear P, and the angle setting means. inner split gear Ia, by adjusting the relative angle of Ib, reduce the backlash between the gears, the
A planetary speed reducer with reduced play can be provided. The lever is
Order to protrude over the scan outwards, while also driving after assembly, may adjust the backlash from the outside is stopped.

[Brief description of drawings]

FIG. 1 is an axial sectional view showing an embodiment of the present invention.

FIG. 2 is a lateral cross-sectional view of the left and right sides of which cross-sectional positions are changed.

FIG. 3 is a diagram showing an operation.

FIG. 4 is a partial sectional view in the axial direction showing another embodiment.

5 is a cross-sectional view of it.

6 is a diagrammatic view of a planetary gear device of the present invention employed as a flop Ranetari over type.

7 is a diagram showing a flop Ranetari over type planetary gear device.

8 is a diagram showing a planetary gear unit against the source LA type.

FIG. 9 is a diagram showing a star type planetary gear device.

[Explanation of symbols]

C carrier I internal gear Ia, Ib internal split gear P planetary gear Pa, Pb planetary split gear S sun gear 3 angle setting means 10 case 75 lever

Claims (1)

[Claims] 1. A sun gear, an internal gear concentric with the sun gear, and a planetary gear that is pivotally supported by a carrier extending from a rotation shaft concentric with the sun gear and meshes with the sun gear and the internal gear. At the same time, the internal gear is composed of first and second internal divided gears that are divided in the axial direction, and the planetary gear is divided in the axial direction and meshes with the first and second internal divided gears, respectively. Provided on the case, including the second planetary split gear
With a lever that protrudes to the outside of the case through the hole
A planetary gear device comprising angle setting means for adjusting another relative angle with respect to one of the first and second internally divided gears by swinging the lever .