JP2006329269A - Lubricant filling structure for planetary gear reducer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lubricant filling structure for a planetary gear reducer for improving the lubricating performance of a gear mechanism and workability during assembly while promoting the flow of air out of an opening portion by filling lubricant into the opening portion with no excessive flow out of the opening portion when storing a sun gear and an input shaft in the opening portion of a casing previously filled with the lubricant. <P>SOLUTION: In the inner wall of the opening portion 8a, a plurality of recessed grooves 8b are arranged side by side which extend from the bottom wall of the opening portion 8a to the opening end of the opening portion 8a and which is recessed in the direction of the outer diameter. Between the peripheral wall of the opening portion 8a and the outer diameter of an internal gear 4, a plurality of cavities are formed which extend from the bottom wall of the opening portion 8a to the opening end. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a lubricant filling structure in a gear device, which includes a gear mechanism that rotates by being filled with a lubricant in a casing, and a rotating body that rotates by transmission of a rotational driving force of the gear mechanism. .

  2. Description of the Related Art Conventionally, there has been known a gear device that includes a plurality of gears that mesh with each other in a case, is rotated by receiving a rotational movement of a rotation shaft of a drive source, and is configured to shift and output the rotation speed. Yes. And in this gear apparatus, in order to reduce the wear of the meshing part of a gear and to perform smooth meshing, there is a thing filled with a lubricant in the case.

  For example, in a planetary gear reducer, a sun gear that is connected to a rotating shaft that is rotated by receiving a driving force of a driving source and is rotated together with the rotating shaft in a casing, and a sun gear that is coaxially arranged with a gap. An installed internal gear, a plurality of planetary gears disposed in a gap and screwed to the sun gear and the internal gear, and a planetary gear rotatably supported and a bearing coaxially with the sun gear (so-called rolling element) And a carrier (which is a so-called rotating body) that is rotatably supported, and the casing is filled with a lubricant (see, for example, Patent Documents 1, 2, and 3).

  Then, as a structure for filling the lubricant in the planetary gear reducer, a through hole that penetrates the casing inward is formed in the peripheral wall of the casing, and after the gear mechanism is housed in the casing, the filler is put into the casing through the through hole. There is one that is configured to inject into the gas and then seal the through hole.

Further, as a structure for filling the lubricant in the planetary gear speed reducer, the casing is divided in the axial direction, the internal gear, the planetary gear and the carrier are stored in the opening of one casing and filled with the lubricant. In some cases, the gear and the input shaft are housed in the opening of the casing so that the sun gear and the planetary gear mesh with each other, and the other casing is connected to one casing to seal the opening. .
JP 2002-181139 A JP 2000-129773 A JP 2000-099617 A

  However, as a lubricant filling structure in the planetary gear speed reducer, a through hole that penetrates the casing inward is formed in the peripheral wall of the casing, and after the gear mechanism is accommodated in the casing, the filler is put into the casing through the through hole. According to the configuration in which the through hole is sealed, the filler injection path is smaller than the volume of the opening hole, and the filler does not reach evenly around each meshing portion of each gear mechanism. There was a risk of impairing the lubricity.

  On the other hand, as a lubricant filling structure in the planetary gear reducer, the casing is divided in the axial direction, and the internal gear, the planetary gear and the carrier are accommodated in the opening of one casing and filled with the lubricant. According to the configuration in which the gear and the input shaft are housed in the opening of the casing, the sun gear and the planetary gear are engaged, and the other casing is connected to one casing to seal the opening. When the sun gear and the input shaft are stored in the opening of the casing, the filler filled in the casing flows out excessively from the opening and impairs the lubrication of the gear mechanism or the workability during assembly. There was a risk of it. In addition, the air in the opening cannot easily escape to the outside, and remains in the opening and impairs the lubrication of the gear mechanism, or the air in the opening is compressed in the opening and the workability during assembly is impaired. Or the lubricant may flow out after assembly.

  Therefore, the present invention can fill the opening without excessively flowing out the filler from the opening when the sun gear and the input shaft are stored in the opening of the casing filled with the filler in advance, and It is an object of the present invention to provide a lubricant filling structure in a planetary gear reducer that can promote the outflow of air in an opening and improve the lubricity of a gear mechanism and the workability during assembly.

  The invention according to claim 1, which has been made to achieve the above object, includes an input shaft that rotates in response to a driving force of a driving source in an opening of a casing, and a sun gear fixed to the tip of the input shaft. And an internal gear disposed coaxially with the sun gear via a gap and configured along the inner wall of the opening, and disposed in the gap and meshing with the sun gear and the internal gear. In a planetary gear reducer comprising a planetary gear and a carrier that rotatably supports the planetary gear and that is rotatably supported by a casing, and wherein the opening is filled with a lubricant that lubricates the gear mechanism. In the lubricant filling structure, a plurality of concave grooves extending from the bottom wall of the opening to the opening end of the opening and recessed in the outer diameter direction are arranged in parallel on the inner wall of the opening. Between the peripheral wall of the opening and the outer diameter of the internal gear, the opening A plurality of voids extending in the opening end portion from the wall is configured, characterized in that.

  According to the filling structure of the lubricant in the planetary gear reducer according to claim 1, the opening is filled with a lubricant that lubricates each gear mechanism, and the opening is formed on the inner wall of the opening from the bottom wall of the opening. A plurality of concave grooves extending in the outer diameter direction and recessed in the outer diameter direction are arranged in parallel, and extend from the bottom wall of the opening portion to the opening end portion between the peripheral wall of the opening portion and the outer diameter of the internal gear. When the sun gear and the input shaft are stored in the opening of the casing, the filler that has been filled in the opening in advance is stored together with the sun gear and the input shaft. The lubricity of the gear mechanism and the workability during assembly can be improved without flowing into the plurality of gaps and flowing out excessively from the opening.

  Further, according to the lubricant filling structure in the planetary gear speed reducer according to claim 1, the air in the opening portion is moved outwardly of the opening portion through the plurality of gaps as the sun gear and the input shaft are housed. Since it can flow out easily and the gap is formed between the outer diameter of the inner gear and the inner wall of the casing, the abrasion powder contained in the lubricant is caused by centrifugal force between the outer diameter of the inner gear and the inner wall of the casing. In the meantime, the residual of wear powder around the meshing portion of the gear mechanism is reduced, and the lubricity of the gear mechanism can be improved.

  Next, the invention according to claim 2 is the lubricant filling structure in the planetary gear reducer according to claim 1, wherein the casing has an outer shape having a rectangular cross section perpendicular to the axial direction. In the cross section, the concave groove is formed to be recessed from the center toward the top of the rectangular outer shape.

  According to the lubricant filling structure in the planetary gear reducer according to claim 2, the casing has an outer shape having a square shape in a cross section orthogonal to the axial direction, and the concave groove is formed in a square shape from the center. Since the sun gear and the input shaft are housed in the opening, the filler previously filled in the opening is replaced with a plurality of rectangular shapes. It can be made to flow evenly toward the top and be easily guided into the groove, and can be easily maintained in the opening.

  Next, the invention according to claim 3 is the lubricant filling structure in the planetary gear speed reducer according to claim 1 or 2, wherein the bottom wall of the opening and the axial end of the internal gear are provided. Between the two, a gap connected to the concave groove is formed.

  According to the structure for filling the lubricant in the planetary gear speed reducer according to claim 3, the gap connected to the concave groove is formed between the bottom wall of the opening and the axial end of the internal gear. Therefore, it is possible to easily guide the filler to the concave groove as the sun gear and the input shaft are accommodated in the opening.

  Further, in the planetary gear speed reducer according to any one of claims 1 to 3, the lubricant filling structure includes the internal gear, the planetary gear, and the carrier in the opening as in the invention according to claim 4. A first casing that is housed and rotatably supported and filled with the lubricant; and a second casing that rotatably supports the input shaft and the sun gear so as to protrude from an end portion. The sun gear protruding from the second casing and the input shaft are inserted into the opening of the first casing to engage the sun gear and the planetary gear, and the first gear By connecting the casing and the second casing and shielding the opening and the gap, the meshing portion of the gear mechanism can be uniformly filled with the filler, and the workability can be improved.

  In the planetary gear speed reducer according to the present invention, when the sun gear and the input shaft are housed in the opening of the casing, the opening is filled in advance with the housing of the sun gear and the input shaft. The filler flows into the plurality of gaps, and does not flow out excessively from the opening, and the meshing portion of the gear mechanism can be uniformly filled with the filler, thereby improving the lubricity of the gear mechanism and the workability during assembly. It can be improved.

  Further, the structure for filling the lubricant in the planetary gear speed reducer of the present invention allows the air in the opening to easily flow out to the outside of the opening through the plurality of gaps with the storage of the sun gear and the input shaft. And since the gap is formed between the outer diameter of the internal gear and the inner wall of the casing, the abrasion powder contained in the lubricant is guided between the outer diameter of the inner gear and the inner wall of the casing by centrifugal force, Residual wear powder around the meshing portion of the gear mechanism is reduced, and the lubricity of the gear mechanism can be improved.

  In the planetary gear speed reducer according to the present invention, the lubricant filling structure includes a plurality of rectangular top portions filled with the filler previously filled in the opening as the sun gear and the input shaft are accommodated in the opening. It can be made to flow evenly toward the groove and be easily guided into the groove, and can be easily maintained in the opening.

  Further, in the planetary gear speed reducer according to the present invention, the structure for filling the lubricant has a gap connected to the concave groove between the bottom wall of the opening and the axial end of the internal gear. As the sun gear and the input shaft are housed in the part, the filler can be easily guided to the concave groove.

  Next, a lubricant filling structure in a planetary gear speed reducer according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing a lubricant filling structure in a planetary gear speed reducer according to the present invention, FIG. 2 is an external view seen from the direction of arrow A in FIG. 3, and FIG. 3 is a first casing in the same embodiment. It is sectional drawing showing the state before an assembly and a 2nd casing.

  As shown in FIG. 1, the planetary gear speed reducer 1 is fixed to the input shaft 2 that rotates by receiving a driving force of a driving motor (not shown) (so-called driving source), and fixed to the tip of the input shaft 2 and input. A sun gear 3 that rotates together with the shaft 2, an internal gear 4 that is coaxially disposed in the sun gear 3 via a gap, and a planetary gear 5 that is disposed in the gap and is screwed into the sun gear 3 and the internal gear 4. The planetary gear 5 is rotatably supported via the connecting pin 6, and the carrier 7, which is rotatably supported coaxially with the sun gear 3, and the inner gear 4, the planetary gear 5 and the carrier 7 are housed in the opening 8a. And the second casing 10 that supports the first casing 8 filled with the lubricant, the input shaft 2 and the sun gear 3 so as to protrude from the end portions, and so on. It has.

  The first casing 8 and the second casing 10 are fixed to each other via bolts 11. The internal gear 4 is press-fitted and fixed to the inner wall of the opening 8 a of the first casing 8, and the bearings 12 and 13 are fixed. The carrier 7 is rotatably supported through the second casing 9, and the input shaft 2 and the sun gear 3 are rotatably supported by the second casing 9 through bearings 14. At this time, the input shaft 2 and the sun gear 3 protrude from the end of the second casing 10 and are accommodated in the opening 8 a of the first casing 8, and the sun gear 3 is engaged with the planetary gear 5. Yes. Further, the planetary gear is rotatably supported by the connecting pin 6 via the bearing 16.

  The carrier 7 is integrally formed with an output shaft 7 a that protrudes outward from the first casing 8, and the output shaft 7 a is driven via the planetary gear reducer 1 (not shown). Connected).

  An oil seal 15 is mounted between the first casing and the output shaft 7a, an oil seal 17 is mounted between the second casing and the input shaft, and the end face of the first casing 8 The end faces of the two casings 10 are joined via a sealing material (not shown, for example, an adhesive) so that the filler filled in the first casing 8 does not leak outside. It is enclosed.

  Next, on the inner wall of the opening 8a, a plurality of concave grooves 8b extending from the bottom wall of the opening 8a to the opening end of the opening 8a and recessed in the outer diameter direction are arranged in parallel, and the peripheral wall of the opening 8a A plurality of gaps extending from the bottom wall of the opening 8a to the opening end are formed between the inner gear 4 and the outer diameter of the internal gear 4.

  Further, a gap 20 connected to the groove 8b is formed between the bottom wall of the opening 8a and the axial end of the internal gear.

  In addition, as shown in FIG. 2, the first casing 8 has a rectangular outer shape in a cross section orthogonal to the axial direction. In the cross section, the concave groove 8 a extends from the center toward the top of the rectangular outer shape. It is formed to be recessed.

  Next, a procedure for assembling the planetary gear reducer will be described with reference to FIG. First, on the first casing 8 side, the connection pin 6 is engaged with the carrier 7 in advance, and the bearing 16 and the planetary gear 5 are inserted into the connection pin 6, and the carrier 7, the connection pin 6, the bearing 16, and the planetary gear are inserted. Assemble 5 etc. together. Next, the internal gear 4 is press-fitted and fixed to the inner wall of the opening of the first casing, and then the bearing 13 is inserted into the output shaft 7a, and the carrier 7, the connecting pin 6, and the bearing 16 are inserted into the opening 8a. It is stored together with the planetary gear 5 and the like. At this time, the planetary gear 5 and the internal gear 4 are accommodated in the opening 8a so as to mesh with each other. Next, the sealing member 15 is engaged between the output shaft and the first casing.

  Next, a filler is injected into the opening 8a. At this time, the amount of the filler to be injected is set so that the filler does not overflow from the opening when the input shaft and the sun gear are accommodated in the opening later. Next, the bearing 12 is engaged between the outer peripheral portion of the carrier 7 and the inner peripheral portion of the first casing 8.

  On the other hand, on the second casing 10 side, first, the input shaft 2 is inserted into the second casing 10 together with the bearing 14, and then the sun gear 3 is press-fitted into the tip of the input shaft 2 protruding from the second casing 10. And fix.

  Next, a sealing material is applied to the end face on the opening side of the first casing 8. Next, the sun gear 3 and the input shaft 2 are housed in the opening 8a so that the sun gear 3 meshes with the planetary gear 5, and the first casing 8 and the second casing 10 are respectively connected to the end faces. And are fixed with bolts 11.

  Below, the effect of the filling structure of the lubricant in the planetary gear reducer 1 of the embodiment having the above-described configuration will be described.

  According to the filling structure of the lubricant in the planetary gear speed reducer 1 described in the present embodiment, the opening 8a is filled with the lubricant that lubricates each gear mechanism, and the inner wall of the opening 8a has the opening 8a. A plurality of recessed grooves 8b extending from the bottom wall to the end of the opening 8a and recessed in the outer diameter direction are arranged in parallel, and the opening 8a is formed between the peripheral wall of the opening 8a and the outer diameter of the internal gear 4. Since a plurality of gaps extending from the bottom wall to the opening end are formed, when the sun gear 3 and the input shaft 2 are housed in the opening 8a of the first casing 8, the inside of the opening 8a As the sun gear 3 and the input shaft 2 are housed, the filler filled in the fluid flows into a plurality of gaps and does not flow out excessively from the opening 8a. Can be improved.

  Further, according to the lubricant filling structure in the planetary gear speed reducer 1 of the present embodiment, the air in the opening 8a is passed through the plurality of gaps as the sun gear 3 and the input shaft 2 are housed. Since the gap is formed between the outer diameter of the internal gear 4 and the inner wall of the first casing 8, the wear powder contained in the lubricant is caused by centrifugal force. As a result, residual wear powder around the meshing portion of the gear mechanism is reduced, and the lubricity of the gear mechanism can be improved.

  In addition, according to the lubricant filling structure in the planetary gear speed reducer 1 of the present embodiment, the first casing 8 has an outer shape having a square shape in a cross section orthogonal to the axial direction, and in the cross section, the concave groove 8b. However, since the sun gear 3 and the input shaft 2 are housed in the opening 8a, the opening 8a is filled in advance. The filler can be evenly flowed toward a plurality of square tops and easily guided into the concave groove 8b, and can be maintained in the opening 8a.

  Further, according to the lubricant filling structure in the planetary gear speed reducer of the present embodiment, the gap 20 connected to the concave groove 8b is formed between the bottom wall of the opening 8a and the end of the internal gear 4 in the axial direction. Since it is comprised, a filler can be easily guide | induced to the ditch | groove 8b with the accommodation of the sun gear 3 and the input shaft 2 in the opening part 8a.

  As mentioned above, although one Example of this invention was described, this invention is not limited to the said Example, It can take a various aspect.

It is sectional drawing showing the filling structure of the lubricant in the planetary gear reducer in one Example of this invention. It is the external view seen from the arrow A direction in FIG. 3 in the planetary gear speed reducer of the Example. It is sectional drawing in which the 1st casing and the 2nd casing in the planetary gear reducer of the Example represent the state before an assembly.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Planetary gear reducer, 2 ... Rotating shaft, 3 ... Sun gear, 4 ... Internal gear, 5 ... Planetary gear, 6 ... Connecting pin, 7 ... Carrier, 7a ... Output shaft, 8 ... First casing, 8a ... Openings, 10 ... second casing, 11 ... bolts, 12, 13, 14, 16 ... bearings, 15, 17 ... sealing members, 20 ... gap.

Claims (4)

An input shaft that rotates in response to a driving force of a driving source, a sun gear fixed to the tip of the input shaft, and a coaxial arrangement with the sun gear via a gap in the opening of the casing An internal gear configured along the inner wall of the opening, a planetary gear disposed in the gap and meshing with the sun gear and the internal gear, and rotatably supporting the planetary gear and rotating to the casing. A lubricant filling structure in a planetary gear speed reducer, wherein the opening is filled with a lubricant that lubricates the gear mechanism.
A plurality of concave grooves extending from the bottom wall of the opening to the opening end of the opening and recessed in the outer diameter direction are arranged in parallel on the inner wall of the opening, and the peripheral wall of the opening and the internal gear A plurality of gaps extending from the bottom wall of the opening to the opening end are formed between
A structure for filling a lubricant in a planetary gear speed reducer. The casing has a rectangular outer shape in cross section perpendicular to the axial direction, and in the cross section, the concave groove is formed to be recessed from the center toward the top of the rectangular outer shape.
The structure for filling a lubricant in the planetary gear reducer according to claim 1. Between the bottom wall of the opening and the axial end of the internal gear, a gap is formed that is connected to the groove.
The filling structure of the lubricant in the planetary gear speed reducer according to claim 1 or 2. A first casing in which the internal gear, planetary gear, and carrier are housed in the opening and rotatably supported, and filled with the lubricant;
A second casing that rotatably supports the input shaft and the sun gear so as to protrude from an end portion;
The sun gear protruding from the second casing and the input shaft are inserted into the opening of the first casing to engage the sun gear and the planetary gear, and the first casing and the first It is configured to connect the two casings and shield the opening and the gap,
4. A structure for filling a lubricant in a planetary gear reducer according to claim 1, wherein the structure is filled with a lubricant.

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