JP2007225017A - Planetary reduction gear lubricating structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lubricating structure for a planetary reduction gear, capable of circulating grease to a power transmission part to be lubricated without splashing therearound in company with the turn of the power transmission part. <P>SOLUTION: Grease is filled in abutting portions P1, P2, P3 among a sun gear 3, a planetary gear 4, and inner rings 5a, 5b for reducing mutual wear to actualize smooth frictional transmission. A pair of shielding plates 6a, 23 are provided on both axial sides via the abutting portions P1, P2, P3 for covering the abutting portions P1, P2, P3 via gaps. To the other shielding plate 23, a blade portion is attached so that the grease flows toward one shielding plate 6a with the turn. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a lubrication structure for lubricating a power transmission mechanism such as a friction transmission portion and a gear meshing portion between rotating members in a planetary reduction gear.

  Conventionally, a solar wheel that rotates in response to a driving force of a drive source in a casing, an inner ring that is coaxially disposed in the solar wheel via a gap, and a solar wheel and an inner ring that are disposed in the gap. A planetary wheel that abuts, and a carrier that rotatably supports the planetary vehicle and that rotates coaxially with the solar vehicle, and revolves the planetary vehicle around the solar vehicle as the solar vehicle rotates, A planetary speed reducer that transmits this revolution motion to a carrier is known.

In this planetary reduction gear, generally, the contact portions of the sun wheel, the planetary wheel, and the inner ring are filled with grease in order to reduce mutual wear and perform smooth friction transmission (for example, patents) Reference 1).
JP 2002-78290 A

  Since the conventional planetary speed reducer is not provided with an effective means for preventing the scattering of grease around the friction transmission portion, the grease is frictionally transmitted along with the rotation of the solar wheel and the planetary wheel. As a result, the scattered lubricating grease cannot be circulated to the friction transmission portion, and power transmission may be impaired. Furthermore, in order to compensate for the scattering of grease, extra grease is required, which may impair productivity.

  Therefore, the present invention provides a lubrication structure in a planetary reducer that allows grease that lubricates the power transmission unit to circulate to the power transmission unit without being scattered around as the power transmission mechanism rotates. Objective.

  The invention according to claim 1, which has been made to achieve such an object, is arranged in a casing in a coaxial manner with a sun wheel rotating by receiving a driving force of a driving source, and a space between the sun wheel and a gap. An inner ring, a planetary wheel disposed in the gap and in contact with the sun wheel and the inner ring, and rotatably disposed on a coaxial line with the sun wheel, and rotatably supporting the planetary wheel. A planetary speed reducer lubrication structure in which the abutting portions of the sun wheel, the planetary wheel, and the inner ring are filled with grease for reducing mutual wear and performing smooth friction transmission. A pair of shielding plates are provided on both sides in the axial direction via the abutting portion so as to cover the corresponding contact portion through a gap.

  According to the lubricating structure of the planetary reduction gear according to claim 1, the shielding plates that cover the abutting portions via the gaps on both sides in the axial direction via the abutting portions of the solar wheel, the planetary wheel, and the inner ring. Since the grease is provided, the grease circulates along the gap without being scattered far away from the contact portion, and the lubrication of the contact portion can be maintained well.

  Next, according to a second aspect of the present invention, in the planetary speed reducer lubricating structure according to the first aspect, one of the pair of shielding plates is integrally provided with the carrier, and the other shielding member is provided. A plate is provided integrally with the solar wheel.

  According to the lubricating structure of the planetary reduction gear according to claim 2, since one shielding plate is provided integrally with the carrier and the other shielding plate is provided integrally with the sun wheel, the planetary vehicle revolution is integrated. Thus, one shield plate rotates, and the other shield plate rotates with the rotation of the sun wheel, thereby facilitating the circulation of grease between the one shield plate and the other shield plate. In addition, according to the lubricating structure of the planetary reduction gear according to the second aspect, the positioning and supporting of the one shielding plate and the other shielding plate can be easily performed in the axial direction, and the productivity can be improved.

  Next, according to a third aspect of the present invention, there is provided the lubricating structure for a planetary reduction gear according to the first or second aspect, wherein the grease is applied to the other shielding plate as the other shielding plate rotates. It is characterized by a wing part that flows toward the plate.

  According to the lubricating structure of the planetary reduction gear according to claim 3, the other shielding plate is provided with the wing portion that causes the grease to flow toward the one shielding plate as the other shielding plate is moved. The circulation property of the grease between the shielding plate and one of the shielding plates can be improved. Further, at this time, since the wing portion is attached to the other shielding plate located on the drive source side, it is possible to prevent the grease from flowing out to the drive source side.

  The planetary reduction gear lubrication structure of the present invention is provided with shielding plates that cover the abutting portions with gaps on both sides in the axial direction via the abutting portions of the sun wheel, the planetary wheel, and the inner ring. The grease circulates along the gap without being scattered far away from the contact portion, and the lubrication of the contact portion can be maintained well.

  Also, the lubricating structure of the planetary speed reducer according to the present invention has one shielding plate integrated with the carrier and the other shielding plate integrated with the sun wheel, so that it is integrated with the revolution of the planetary vehicle. While one shielding plate rotates, the other shielding plate rotates integrally with the solar wheel, and the circulation of grease between one shielding plate and the other shielding plate can be promoted. Further, the lubricating structure of the planetary reduction gear according to the present invention can easily position and support the one shielding plate and the other shielding plate in the axial direction, thereby improving productivity.

  Further, in the planetary reduction gear lubrication structure of the present invention, the other shielding plate is provided with a wing portion that causes grease to flow toward one shielding plate as the other shielding plate moves. It is possible to improve the circulation of grease between the one shielding plate. Moreover, since the wing part is attached to the other shielding plate located on the drive source side, it is possible to prevent the grease from flowing out to the drive source side.

  Next, a lubricating structure for a planetary reduction gear according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing a configuration of a planetary speed reducer to which a lubricating structure of a planetary speed reducer according to the present invention is applied, and FIG. 2 is an external view showing the configuration of the other shielding plate in FIG. ) Is a front view as viewed from the axial direction, (b) is a cross-sectional view taken along the line BB in FIG. (A), and FIG. C is a plan view as viewed from the C direction in FIG.

  As shown in FIG. 1, the planetary speed reducer 1 includes a solar wheel 3 that rotates in response to a driving force of a driving motor 2 (so-called driving source in the present invention) 2 in casings 21 and 22. Inner rings 5a and 5b arranged coaxially in the vehicle 3 via a gap, the planetary wheel 4 disposed in the gap and contacting the solar wheel 3 and the inner rings 5a and 5b, on the same axis as the solar wheel 3 (see FIG. 1 on the line XX in FIG. 1, and includes a carrier 6 that rotatably supports the planetary wheel 4, an output shaft 27 that rotates together with the carrier 6, and the like, and includes the solar wheel 3, the planetary wheel 4, and the inner ring. Greases for lubricating the frictional transmission of the contact portions P1, P2, and P3 are filled around the contact portions P1, P2, and P3 such as 5a and 5b.

  The planetary speed reducer 1 includes a locking ring 7 in which the drive motor 2 is fixed to the casing 21 via a bracket 2a and a bolt 25, and the rotation of the ring 5a is locked between the ring 5a and the bracket 2a. And a coil spring 11 that urges the ring 5a toward the ring 5b.

  One end of the output shaft 27 located on the drive motor 2 side is press-fitted and fixed to the carrier 6 and is rotatably supported on the casing 21 via the bearing 18, and the other end is attached to the casing 22 via the bearing 19. It is supported rotatably. The bearing 19 has an inner ring abutting against a retaining ring 20 engaged with the output shaft 27 at one end side, and an outer ring abutting against a wave washer 13 having elasticity in the axial direction at the other end side. Has been.

  The inner rings 5a and 5b are provided to face each other so as to sandwich the planetary wheel 4, and engage with the protrusion 7a provided on the locking ring 7 and the protrusion 21a provided on the casing 21, respectively. It is mounted so that it cannot rotate. Also. The inner ring 5a is slidably mounted in the axial direction, and is biased toward the inner ring 5b by the coil spring 11.

  The planetary wheel 4 is supported by a carrier pin 12 so as to be cantilevered and rotatable with respect to the carrier 6 and is composed of a large diameter roller portion 4a and a small diameter roller portion 4b. The outer peripheral surface of the large diameter roller portion 4 a is in contact with the outer peripheral surface of the solar wheel 3. The small-diameter roller portion 4b is formed so as to protrude from the center of both side surfaces of the large-diameter roller portion 4a concentrically with the large-diameter roller portion 4a and in a truncated cone shape, and an inner ring 5a is formed on the tapered surface of the small-diameter roller portion 4b. And the taper surface formed in the internal peripheral surface of the inner ring 5b is contact | abutting. Further, the planetary wheel 4 is rotatably supported by the carrier pin 12 via a bearing 10.

  Further, the planetary reduction gear 1 includes a plurality of coil springs 11 for press-contacting the inner rings 5 a and 5 b to the small diameter roller portion 4 b of the planetary wheel 4. The plurality of coil springs 11 are housed in through holes formed in the locking ring 7, one end is supported by the bracket 2a, the other end abuts on the ring 5a, and urges the inner ring 5a toward the inner ring 5b. ing.

  The inner peripheral tapered surfaces of the inner ring 5a and the inner ring 5b are pressed against the tapered surface of the small-diameter roller portion 4b of the planetary wheel 4 by the coil spring 11, and the planetary wheel 4 is generated by a component of the pressing force toward the center. The outer peripheral surface of the large-diameter roller portion 4 a is pressed against the outer peripheral surface of the sun wheel 3. Therefore, each contact portion P1, P2, P3 is configured such that torque is transmitted by a traction method, and the planetary wheel 4 rotates while revolving around the solar wheel 3.

  The carrier 6 is a ring-shaped member, and an output shaft 27 is inserted into a hole in the center portion and fixed so as not to rotate relative to each other. Note that the carrier 6 and the output shaft 27 may be integrally formed.

  When the drive motor 2 is driven, the planetary speed reducer 1 has the rotational speeds of the outer diameters of the sun wheel 3, the large diameter roller part 4a, the small diameter roller part 4b, and the inner rings 5a and 5b of the planetary car 4, The speed is reduced by a reduction ratio determined by the inner diameter, and the rotational force is output via the carrier 6 and the output shaft 27.

  Further, the planetary reduction gear 1 includes a rotary encoder 8 that detects the rotational speed of the output shaft 27 and outputs it to a control device (not shown). Specifically, the rotary encoder 8 includes a rotating plate 8a having a plurality of identification codes in the circumferential direction, and a sensor unit 8b that sequentially detects the identification codes as the rotating plate 8a rotates and outputs a pulse signal corresponding to the rotation speed. And is composed of. The rotating plate 8 a is fixed to the output shaft 27 via the bush 9. Then, this pulse signal is input to a control device (not shown), and the control device detects the phase difference between the detected pulse and the reference pulse, and controls the rotational speed of the drive motor 2 so as to eliminate this phase difference. .

  Next, the lubricating structure of the planetary reduction gear 1 is such that the grease that lubricates the friction transmission parts (contact parts P1, P2, and P3 in the figure) does not scatter around the rotation of the friction transmission parts. In addition, a pair of shielding plates 6a and 23 are provided on both sides in the axial direction via the contact portions P1, P2, and P3 so as to cover the contact portions P1, P2, and P3 with a gap therebetween. 6 and the other shielding plate 23 is fixed to the solar wheel 3.

  One shielding plate 6 a is formed along the axial end of the solar wheel 3 and the axial end of the planetary wheel 4, and is configured to have a substantially uniform gap with respect to these ends. ing.

  As shown in FIG. 2, the other shielding plate 23 includes a through hole 23 a through which the solar wheel 3 is inserted, a screw-in hole 23 f for a bolt that is fixed to the solar wheel 3, and grease that is supplied with the rotation of the other one. Three wings 23b are formed to flow toward the shielding plate 6a.

  In addition, as shown in FIG. 2C, the wing portion 23b is formed such that the end surface located on the one shielding plate 6a side forms a gradient 23c, 23d, and the grease flows as it rotates. It is configured to promote.

  Below, the effect of the lubrication structure of the planetary reduction gear 1 of the said Example is described.

  According to the lubrication structure of the planetary reduction gear 1 of the present embodiment, the contact portions are provided on both sides in the axial direction via the contact portions P1, P2, and P3 of the sun wheel 3, the planetary wheel 4, and the inner rings 5a and 5b. Since the shielding plates 6a and 23 that cover P1, P2, and P3 through the gaps are provided, the grease circulates along the gaps without contacting the contact parts P1, P2, and P3. The lubrication of the parts P1, P2, and P3 can be maintained well.

  Further, according to the lubricating structure of the planetary speed reducer 1 of the present embodiment, one of the shielding plates 6 a is provided integrally with the carrier 6, and the other shielding plate 23 is fixed to the solar wheel 3. One shield plate 6a rotates together with the revolution of the other, and the other shield plate 23 rotates with the sun wheel 3 to promote the circulation of grease between the one shield plate 6a and the other shield plate 23. In addition, it is possible to easily position and support the one shielding plate 6a and the other shielding plate 23 in the axial direction, thereby improving productivity.

  According to the lubricating structure of the planetary reduction gear 1 of the present embodiment, the other shielding plate 23 is provided with the wing portion 23b that causes the grease to flow toward the one shielding plate 6a as it rotates. It is possible to improve the circulation of grease between the other shielding plate 23 and the one shielding plate 6a. At this time, since the wing 23b is attached to the other shielding plate 23 located on the drive source side, it is possible to prevent the grease from flowing out to the drive motor 2 side.

  As mentioned above, although one Example of this invention was described, this invention is not limited to the said Example.

  For example, the lubricating structure of the planetary speed reducer according to the present embodiment was used for the traction type in which the solar wheel 3, the planetary wheel 4, the inner rings 5a, 5b, etc. are in contact with each other and the rotational force is frictionally transmitted. Instead, the sun wheel 3, the planetary wheel 4, the inner rings 5a, 5b and the like may be used in a gear transmission type in which the gears mesh with each other.

  Moreover, although the lubricating structure of the planetary reduction gear 1 of the present embodiment is formed with the one shielding plate 6a integrally with the carrier 6, these may be formed separately and fixed or detachable. . The other shielding plate 23 may be formed integrally with the solar wheel 3.

  Further, in the lubrication structure of the planetary reduction gear 1 of the present embodiment, one shielding plate 6a is formed along the axial end of the solar wheel 3 and the axial end of the planetary wheel 4, and these ends Although it is configured so as to have a substantially uniform gap with respect to the portion, one of the shielding plates 6a with respect to the contact portions P1, P2, and P3 is arranged so that the grease easily collects in the vicinity of the contact portions P1, P2, and P3. The gap may be made wider than the other part, or a recess facing the contact parts P1, P2, P3 may be formed on one shielding plate 6a. Further, the other shielding plate 23 may also be formed with an end face facing the planetary car 4 along the end of the planetary car 4 in the axial direction.

It is sectional drawing showing the structure of the planetary reduction gear to which the lubrication structure of the planetary reduction gear of this invention was applied. It is an external view showing the structure of the other shielding board in FIG. 1, (a) The figure is a front view seen from the axial direction, (b) is a BB cross-sectional view in FIG. a) It is the top view seen from the C direction in a figure. It is a circuit diagram of the failure detection part in the same Example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Planetary reducer, 2 ... Drive motor, 2a ... Bracket, 3 ... Sun wheel, 4 ... Planetary wheel, 4a ... Large diameter roller part, 4b ... Small diameter roller part, 5a, 5b ... Inner ring, 6 ... Carrier, 6a , 23 shielding plate, 7 ... locking ring, 7a, 21a ... projection, 8 ... rotary encoder, 8a ... rotating plate, 8b ... sensor part, 9 ... bushing, 10, 18, 19 ... bearing, 11 ... coil spring, DESCRIPTION OF SYMBOLS 12 ... Carrier pin, 13 ... Wave washer, 20 ... Retaining ring, 21, 22 ... Casing, 23a ... Through-hole, 23b ... Wing part, 23c, 23d ... Gradient, 23f ... Screw-in hole, 25, 26 ... Bolt, 27 ... Output shaft.

Claims (3)

In the casing,
A sun wheel that rotates in response to the driving force of the driving source;
An inner ring coaxially arranged in the solar wheel with a gap therebetween;
A planetary wheel disposed in the gap and in contact with the solar wheel and the inner ring;
A carrier rotatably disposed on a coaxial line with the sun wheel, and a carrier for rotatably supporting the planetary wheel;
The sun wheel, the planetary wheel, and the contact portion of the inner ring are filled with grease for reducing wear and smooth friction transmission,
A pair of shielding plates are provided on both sides in the axial direction via the abutting part, covering the corresponding part with a gap,
A lubrication structure for a planetary speed reducer. Of the pair of shielding plates, one shielding plate is provided integrally with the carrier, and the other shielding plate is provided integrally with the solar wheel.
The lubrication structure of the planetary reduction gear according to claim 1, wherein: The other shielding plate is provided with a wing portion that causes the grease to flow toward the one shielding plate with rotation,
The lubricating structure for a planetary speed reducer according to claim 1 or 2, wherein the lubricating structure is a planetary speed reducer.

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