JP2016070322A - Speed changer and driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a speed changer having a structure capable of restricting a leakage of grease toward an input side member, restricting an increasing of manufacturing cost and restricting a reduction in productivity.SOLUTION: One preferred embodiment of a speed changer of this invention comprises a bracket to which an input side member is attached and a speed changing part. The speed changing part comprises a planetary rotating member constituting a planetary speed changing mechanism together with a sun rotating member, and a washer for supporting the planetary rotating member from one side. A bracket main body part of the bracket comprises the first partition wall for partitioning the input side member and a speed changing part, the second partitioning wall part protruded from the other surface of the first partitioning wall part and having an annular inner surface and a supporting part positioned inside in a radial direction of the second partitioning wall part to support the washer from one side. The first partitioning wall part and the supporting part are a part of a single member. An inside in a radial direction of the second partitioning wall part is provided with a clearance. The clearance is connected to a space where the sun rotating member and the planetary rotating member are arranged.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a transmission and a drive device.

  For example, as shown in Patent Document 1, a transmission having a first restriction wall portion and a second restriction wall portion has been proposed for the purpose of suppressing leakage of grease without using an oil seal. The 1st control wall part has received the planetary gear via the thrust bearing.

JP 2012-47325 A

  In the transmission as described above, the first restriction wall portion that receives the planetary gear and the second restriction wall portion are provided as separate members. For this reason, there is a problem that the number of parts increases and the manufacturing cost of the transmission increases. In addition, the increase in the number of parts increases the number of man-hours for assembling the transmission, resulting in a decrease in transmission productivity.

  In view of the above problems, one aspect of the present invention is a structure that can suppress the leakage of grease to the input side member, can suppress an increase in manufacturing cost, and can suppress a decrease in productivity. It is an object of the present invention to provide a transmission having the transmission and a drive device including such a transmission.

  One aspect of the transmission according to the present invention is a transmission that is attached to an input-side member that includes a shaft centering on a central axis extending in one direction, and a shaft bearing that supports the shaft. A bracket to which the input side member is attached on one side of the bracket, and a transmission portion provided on the other side in the one direction of the bracket, and the transmission portion is provided on an end portion on the one side of the shaft. A plurality of planetary rotating members constituting a planetary speed change mechanism together with a sun rotating member; and a washer for supporting the plurality of planetary rotating members from the one side, wherein the bracket is a bracket body to which the input side member is attached The bracket main body has a through-hole into which the shaft is inserted, and a first partition wall that separates the input side member and the transmission unit; A second partition wall projecting from the other surface of the first partition wall and having an inner surface of the annular partition wall, and positioned radially inside the second partition wall to support the washer from the one side A support part, and the first partition part and the support part are parts of a single member, and inside the radial direction of the second partition part, a gap is provided, The gap is connected to a space in which the solar rotating member and the planetary rotating member are arranged.

  According to one aspect of the present invention, it is possible to suppress the leakage of grease to the input side member, to suppress an increase in manufacturing cost, and to have a structure capable of suppressing a decrease in productivity, and A drive device comprising such a transmission is provided.

FIG. 1 is a cross-sectional view showing a portion of the drive device of the present embodiment. FIG. 2 is an exploded perspective view showing a part of the planetary transmission mechanism of the present embodiment. FIG. 3 is a front view showing the bracket of the present embodiment. FIG. 4 is a rear view showing the bracket of the present embodiment. FIG. 5 is a cross-sectional view showing the bracket of the present embodiment. FIG. 6 is an explanatory diagram for explaining the effect of the present embodiment. FIG. 7 is a front view showing another example of the bracket of the present embodiment. FIG. 8 is a cross-sectional view showing a part of another example of the driving apparatus of the present embodiment. FIG. 9 is a cross-sectional view showing a part of another example of the driving apparatus of the present embodiment.

  Hereinafter, a transmission and a driving device according to an embodiment of the present invention will be described with reference to the drawings. The scope of the present invention is not limited to the following embodiments, and can be arbitrarily changed within the scope of the technical idea of the present invention. Moreover, in the following drawings, in order to make each structure easy to understand, the actual structure may be different from the scale, number, or the like in each structure.

  In the drawings, an XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system. In the XYZ coordinate system, the Y-axis direction is a direction parallel to the axial direction (one direction) of the central axis J1 shown in FIG. The Z-axis direction is the vertical direction in FIG. 1 among the directions parallel to the radial direction of the central axis J1. The X-axis direction is a direction orthogonal to both the Y-axis direction and the Z-axis direction.

In the following description, the positive side (+ Y side, the other side) in the Y-axis direction is referred to as “front side”, and the negative side (−Y side, one side) in the Y-axis direction is referred to as “rear side”. Call it. However, the rear side and the front side are names used for explanation only, and do not limit the actual positional relationship and direction. Unless otherwise specified, in the following description, a direction parallel to the central axis J1 (Y-axis direction) is simply referred to as “axial direction”, and a radial direction around the central axis J1 is simply “radial direction”. a call, the circumferential direction around the center axis J1, i.e., about the axis of the central axis J of (theta _Y direction) simply referred to as "circumferential direction".

In this specification, “extending in the axial direction” means not only strictly extending in the axial direction (Y-axis direction) but also extending in a direction inclined by less than 45 ° with respect to the axial direction. Including.
In this specification, the term “extends in the radial direction” means 45 ° with respect to the radial direction, in addition to the case where it extends strictly in the radial direction, that is, the direction perpendicular to the axial direction (Y-axis direction). Including the case of extending in a tilted direction within a range of less than.

FIG. 1 is a cross-sectional view showing a part of the driving device 10 of the present embodiment.
As shown in FIG. 1, the drive device 10 of the present embodiment includes a motor 30 as an input side member, and a transmission 20 attached to the motor 30.

The motor 30 includes a shaft 31 centering on a central axis J1 extending in one direction (Y-axis direction), and a shaft bearing 32 that supports the shaft 31.
The transmission 20 includes a transmission unit 50 and a bracket 40.

  The motor 30 is attached to the rear side (−Y side) of the bracket 40 in the axial direction (Y-axis direction). The transmission unit 50 is provided on the front side (+ Y side) of the bracket 40 in the axial direction. That is, the bracket 40 connects the motor 30 and the transmission unit 50. The shaft bearing 32 is held by the bracket 40. The shaft 31 is inserted into the transmission 20 via the bracket 40. Hereinafter, each component will be described in detail.

<Transmission>
In the present embodiment, the transmission 20 is a two-stage transmission. That is, the transmission 20 shifts the rotational motion input from the motor 30 in two steps and outputs it. In the present embodiment, the housing of the transmission 20 includes a bracket 40, a rear side cylindrical member 60 described later, a front side cylindrical member 70 described later, and a lid 77 described later.

(Transmission section)
The transmission unit 50 includes a rear planetary transmission mechanism (planetary transmission mechanism) 51 and a front planetary transmission mechanism 52. In the present embodiment, the rear planetary transmission mechanism 51 and the front planetary transmission mechanism 52 are, for example, planetary gear mechanisms.

[Rear planetary speed change mechanism]
FIG. 2 is an exploded perspective view showing a part of the rear planetary speed change mechanism 51.
As shown in FIGS. 1 and 2, the rear planetary speed change mechanism 51 includes a rear cylindrical member 60, a plurality of rear planetary rotating members (planet rotating members) 62, and a plurality of rear carrier pins (carrier pins). 63, a plurality of rear side needle bearings (needle bearings) 64, a rear side planet carrier 65, a rear side washer (washer) 66, and a front side washer 67. That is, the transmission unit 50 includes a rear cylindrical member 60, a plurality of rear planetary rotating members 62, a plurality of rear carrier pins 63, a plurality of rear needle bearings 64, a rear planetary carrier 65, Side washer 66.

  As shown in FIG. 1, the rear planetary speed change mechanism 51 includes a rear side planetary rotation member 62 by a rear side solar rotation member (solar rotation member) 61 provided at the front side (+ Y side) end of the shaft 31. It functions by transmitting rotational power to the. That is, the rear planetary speed change mechanism 51 includes the above-described components and the rear-side solar rotating member 61.

  In the present embodiment, the rear-side solar rotating member 61 is, for example, a sun gear. That is, a gear is provided on the outer surface of the rear-side solar rotating member 61 in the present embodiment. In the present embodiment, the rear-side solar rotating member 61 is provided as a single member with the shaft 31, for example.

  The rear side cylindrical member 60 is a cylindrical member. The rear side cylindrical member 60 constitutes a part of the casing of the transmission 20. In the present embodiment, the rear side cylindrical member 60 is, for example, an internal gear. That is, in this embodiment, a gear is provided on the inner side surface of the rear cylindrical member 60.

  The rear planetary rotating member 62 is provided on the radially inner side of the rear cylindrical member 60. The rear planetary rotating member 62 and the rear sun rotating member 61 constitute a rear planetary speed change mechanism 51. In the present embodiment, the rear planetary rotating member 62 is, for example, a planetary gear. That is, a gear is provided on the outer surface of the rear planetary rotating member 62. For example, three rear planetary rotating members 62 are provided as shown in FIG. The rear planetary rotating member 62 is provided on the radially outer side of the rear solar rotating member 61 as shown in FIG. As shown in FIG. 2, the rear planetary rotating members 62 are arranged at equal intervals along the circumferential direction.

  The rear planetary rotating member 62 is attached to the rear planetary carrier 65 by a rear carrier pin 63. The rear-side planetary rotation member 62 can rotate around a rear-side carrier pin axis (carrier pin axis) J2, which is an axis passing through the center of the rear-side carrier pin 63. That is, the rear side carrier pin 63 supports the rear side planetary rotation member 62 in a rotatable manner. A rear needle bearing 64 is provided between the rear planetary rotating member 62 and the rear carrier pin 63 in the radial direction.

The outer surface of the rear planetary rotating member 62 is in contact with the outer surface of the rear sun rotating member 61 and the inner surface of the rear cylindrical member 60. In the present embodiment, since the rear planetary speed change mechanism 51 is a planetary gear mechanism, the gear of the rear side sun rotating member 61 and the gear of the rear side planetary rotating member 62 are engaged with each other. Further, the gear of the rear side cylindrical member 60 and the gear of the rear side planetary rotating member 62 are engaged with each other. Although not shown in the figure, grease is injected as lubricating oil into the meshing portions of the gears. The rear planetary rotating member 62 rotates around the rear carrier pin axis J2 and revolves around the central axis J1 (± θ _Y direction) as the rear sun rotating member 61 rotates.

  In addition, as grease injected as lubricating oil, it is preferable to use the grease whose consistency is 1 or more, for example. As the grease, for example, it is particularly preferable to use a grease having a consistency of 2 or more. The consistency is a value representing the hardness of the grease. The consistency can be measured based on the JIS standard (JIS K 2220: 2013). When the consistency is in the above range, it is easy to hold the grease in a gap AR11 described later.

  The rear carrier pin 63 is fitted in a hole provided in the rear planet carrier 65. The rear carrier pin 63 is fixed to the rear planet carrier 65. In the present embodiment, for example, three rear side carrier pins 63 are provided in accordance with the number of rear side planetary rotation members 62. The rear carrier pin axis J <b> 2 of the rear carrier pin 63 is located on the radially outer side than the shaft bearing 32.

  The rear needle bearing 64 is fitted inside the rear planetary rotating member 62. A rear carrier pin 63 is fitted inside the rear needle bearing 64. In the present embodiment, for example, three rear side needle bearings 64 are provided in accordance with the number of rear side planetary rotation members 62. The configuration of the rear needle bearing 64 is not particularly limited. That is, in the present embodiment, any needle bearing may be used as the rear side needle bearing 64.

The rear planetary carrier 65 supports the rear planetary rotating member 62 via the rear carrier pin 63. At the center of the rear planetary carrier 65, a central hole portion 65a that opens concentrically with the central axis J1 and opens to the front side (+ Y side) is provided. A front-side solar rotating member 71, which will be described later, is fitted and fixed in the center hole 65a. The rear planetary carrier 65 rotates around the central axis J1 (± θ _Y direction) as the rear planetary rotating member 62 revolves.

  The rear washer 66 is provided on the rear side (−Y side) of the rear planetary rotating member 62. The rear washer 66 overlaps at least a part of the rear planetary rotating member 62, at least a part of the rear carrier pin 63, and at least a part of the rear needle bearing 64 when viewed in the axial direction (Y-axis direction). ing. In the present embodiment, the rear washer 66 overlaps a part of the rear planetary rotating member 62, the entire rear carrier pin 63, and the entire rear needle bearing 64 as viewed in the axial direction.

  In the present embodiment, the rear washer 66 supports the plurality of rear planetary rotating members 62, the plurality of rear carrier pins 63, and the plurality of rear needle bearings 64 from the rear side. The front washer front surface 66a of the rear washer 66 is in contact with at least one of the rear planetary rotating member 62, the rear carrier pin 63, and the rear needle bearing 64. The rear washer 66 is supported from the front side by a support portion 44 of the bracket 40 described later.

  In the present specification, the fact that the rear washer 66 supports the member does not mean that the rear washer 66 contacts the member, and the movement of the member may be restricted by the rear side washer 66. Including. For example, the rear-side washer 66 supports the rear-side planetary rotating member 62. The rear-side washer 66 restricts the movement of the rear-side planetary rotating member 62 from the rear-side washer 66 to the rear side (−Y side). Including that. In this case, the rear-side washer 66 and the rear-side planetary rotation member 62 do not necessarily have to be in contact with each other. The same applies to the rear carrier pin 63 and the rear needle bearing 64.

  The outer edge of the rear side washer 66 is located radially outside the rear side needle bearing 64. The outer edge of the rear washer 66 is positioned on the radially inner side of the partition wall inner surface 43a of the second partition wall 43 described later. The inner edge of the rear washer 66 is located radially inward of the rear needle bearing 64. The inner edge of the rear side washer 66 is located radially outside the rear side solar rotating member 61.

  The front washer 67 supports the rear planet carrier 65 from the front side (+ Y side). The front washer 67 is in contact with the rear planet carrier 65. The front washer 67 is supported from the front side by a front planetary carrier 75 described later.

  The rear washer 66 and the front washer 67 sandwich the rear planetary rotating member 62, the rear carrier pin 63, the rear needle bearing 64, and the rear planetary carrier 65 from both sides in the axial direction (Y-axis direction). Thereby, the rear planetary carrier 65 is supported between the bracket 40 and a front planetary carrier 75 described later so as to be rotatable about the central axis J1. The rear-side planetary rotation member 62, the rear-side carrier pin 63, and the rear-side needle bearing 64 are supported between the bracket 40 and the front-side planetary carrier 75 so as to be able to revolve around the central axis J1.

[Front planetary transmission mechanism]
The front planetary transmission mechanism 52 is provided on the front side (+ Y side) of the rear planetary transmission mechanism 51. The front planetary speed change mechanism 52 includes a front cylindrical member 70, a front sun rotating member 71, a plurality of front planetary rotating members 72, a plurality of front carrier pins 73, and a plurality of front needle bearings 74. , A front planetary carrier 75, front planetary carrier bearings 76 a and 76 b, a lid 77, and an output shaft 78.

The front side cylindrical member 70 is attached to the front side (+ Y side) of the rear side cylindrical member 60 of the rear side planetary transmission mechanism 51. The front side cylindrical member 70 is the same as the rear side cylindrical member 60.
The front-side solar rotating member 71 is fixed to the rear-side planet carrier 65 of the rear-side planetary transmission mechanism 51. The front-side solar rotating member 71 rotates around the central axis J1 (± θ _Y direction) together with the rear-side planetary carrier 65.

The front-side cylindrical member 70, the front-side solar rotating member 71, and the front-side planetary rotating member 72 are configured to mesh with each other in the same manner as the rear-side planetary transmission mechanism 51. That is, the front planetary rotating member 72 rotates around the front carrier pin axis J3 and revolves around the central axis J1 (± θ _Y direction) as the front sun rotating member 71 rotates. Other configurations of the front planetary rotating member 72 are the same as the configurations of the rear planetary rotating member 62.

  The front carrier pin 73 is the same as the rear carrier pin 63 of the rear planetary transmission mechanism 51. The front needle bearing 74 is the same as the rear needle bearing 64 of the rear planetary transmission mechanism 51.

Similar to the rear planetary carrier 65, the front planetary carrier 75 rotates around the central axis J1 (± θ _Y direction) as the front planetary rotating member 72 revolves. The front planetary carrier 75 is supported by front planetary carrier bearings 76a and 76b so as to be rotatable around the central axis J1. An output shaft 78 is connected to the front side (+ Y side) end of the front planetary carrier 75.

The front planetary carrier bearing 76 a is held by the rear cylindrical member 60 and the front cylindrical member 70.
The front planetary carrier bearing 76 b is held by the lid portion 77.

The lid portion 77 is attached to the front side (+ Y side) of the front side cylindrical member 70. A hole penetrating in the axial direction (Y-axis direction) is provided in the center of the lid portion 77. The lid 77 constitutes a part of the housing of the transmission 20.
The output shaft 78 connected to the front end of the front planetary carrier 75 is exposed to the outside of the casing of the transmission 20 through the hole of the lid 77. In the present embodiment, the output shaft 78 is a single member with the front planetary carrier 75.

(bracket)
3 to 5 are diagrams showing the bracket 40. FIG. 3 is a front view (ZX view), that is, a view seen from the front side (+ Y side) toward the rear side (−Y side). FIG. 4 is a rear view (ZX view), that is, a view seen from the rear side toward the front side. FIG. 5 is a cross-sectional view.
As shown in FIG. 5, the bracket 40 includes a bracket main body 41 and a bearing holding member 45. In the present embodiment, the bracket 40 is a single member. The bracket 40 constitutes a part of the housing of the transmission 20.

[Bracket body]
As shown in FIG. 1, the motor 30 is attached to the bracket body 41. The bracket main body 41 has a first partition wall 42, a second partition wall 43, and a plurality of support portions 44. The first partition wall portion 42 and the support portion 44 are a single member, that is, a portion of the bracket 40. In the present embodiment, the second partition wall 43 is a single member, that is, a part of the bracket 40. That is, in this embodiment, the 1st partition part 42, the 2nd partition part 43, and the support part 44 are the parts of the bracket 40 which is a single member.

  The first partition wall 42 separates the motor 30 and the transmission unit 50. As shown in FIG. 4, the first partition wall 42 has a substantially disk shape. The 1st partition part 42 has the through-hole 42b. The through hole 42 b is provided in the center of the first partition wall 42. As shown in FIG. 1, the shaft 31 is inserted into the through hole 42b. The through hole 42b is concentric with the central axis J1.

The second partition wall portion 43 protrudes to the front side from the partition wall front surface 42 a on the front side (+ Y side) of the first partition wall portion 42. The second partition wall 43, as shown in FIG. 3, is provided over the circumference of the circumferential direction (theta _Y direction). The second partition wall portion 43 has an annular partition wall inner surface 43a. In the present embodiment, the second partition wall 43 is, for example, cylindrical as shown in FIGS. 3 and 5. The second partition wall 43 constitutes an inner wall portion of the bracket 40. In the present embodiment, the second partition wall 43 is provided at an end portion on the radially outer side of the first partition wall 42.

  On the inner side of the second partition wall portion 43 in the radial direction, an air gap AR11 is provided. As shown in FIG. 1, the air gap AR11 is connected to a space AR2 in which the rear-side solar rotating member 61 and the rear-side planetary rotating member 62 are arranged. The space AR <b> 2 is a space located inside the rear side cylindrical member 60. In the present embodiment, the gap AR <b> 11 is in direct contact with the space AR <b> 2 on the radially inner side from the inner edge of the rear side washer 66 and on the outer side in the radial direction from the outer edge of the rear side washer 66.

  In the present embodiment, the partition wall inner surface 43 a of the second partition wall 43 is located radially outside the outer edge of the rear washer 66. That is, the front side (+ Y side) end portion of the partition wall inner surface 43 a of the second partition wall 43 is located on the radially outer side with respect to the outer edge of the rear washer 66.

  In the present embodiment, the partition wall inner surface 43a of the second partition wall 43 is an inclined surface that is inclined radially outward from the rear side to the front side, as shown in FIGS. That is, in the present embodiment, the inner diameter of the second partition wall 43 continuously increases from the rear side (−Y side) toward the front side (+ Y side).

  In other words, an inclined portion is provided on the inner surface 43 a of the partition wall portion of the second partition wall portion 43. The inclined portion extends from the front side (+ Y side) end portion of the partition wall inner side surface 43a located radially outside the outer edge of the rear washer 66 toward the rear side (−Y side) in a radially inward direction. Yes.

  The support portion 44 supports the rear washer 66 from the rear side (−Y side). That is, the support portion 44 supports the plurality of rear planetary rotating members 62, the plurality of rear carrier pins 63, and the plurality of rear side needle bearings 64 from the rear side via the rear side washer 66. The support portion 44 is located on the radially inner side of the second partition wall portion 43.

  In the present embodiment, the support portion 44 has a plate shape protruding from the partition wall front surface 42a of the first partition wall portion 42 to the front side (+ Y side). As shown in FIG. 3, the support portion 44 extends radially inward from the partition wall inner side surface 43 a of the second partition wall 43. That is, the support portion 44 extends in the radial direction. In the present embodiment, the support portion 44 is connected to the first partition wall portion 42 and the second partition wall portion 43 as shown in FIG.

In the present embodiment, as shown in FIG. 3, for example, eight support portions 44 are provided. Support portion 44, around the through-hole 42b of the first partition wall 42, are arranged at equal intervals along the circumferential direction of the central axis J1 (theta _Y direction).

  As shown in FIG. 5, a stepped portion 46 is provided at the end on the front side (+ Y side) of the support portion 44 so that the inner side in the radial direction is concave on the rear side (−Y side). The step portion 46 includes a step surface 46a that intersects the radial direction and a support surface 46b that intersects the axial direction (Y-axis direction). In the present embodiment, the step surface 46a is orthogonal to the radial direction. In the present embodiment, the support surface 46b is orthogonal to the axial direction.

  As shown in FIG. 3, the step surface 46 a is provided for each support portion 44 arranged at equal intervals along the circumferential direction. The radial distance from the central axis J1 of each step surface 46a is the same. A rear washer 66 is disposed on the radially inner side of the step surface 46a. The rear washer 66 is fitted into a surface constituted by each step surface 46a. Thus, the rear washer 66 is positioned in the radial direction by the step surfaces 46a.

  As shown in FIG. 1, the support surface 46 b is in contact with a rear side (−Y side) washer rear surface 66 b of the rear side washer 66. As a result, the support portion 44 supports the rear washer 66.

[Bearing holding member]
The bearing holding member 45 holds the shaft bearing 32. The bearing holding member 45 is provided on the rear side (−Y side) of the first partition wall portion 42 in the bracket main body portion 41. The bearing holding member 45 protrudes from the rear side surface of the first partition wall portion 42 to the rear side. As shown in FIG. 4, the bearing holding member 45 has, for example, a cylindrical shape. In the present embodiment, the bearing holding member 45 is concentric with the central axis J1. In the present embodiment, the bearing holding member 45 is a single member, that is, a part of the bracket 40.

<Motor>
As shown in FIG. 1, the front side (+ Y side) end of the shaft 31 of the motor 30 passes through the shaft bearing 32 held by the bearing holding member 45 and the through hole 42 b of the first partition wall 42. It is inserted into the transmission 20. The front-side end of the shaft 31 is located in a gap AR11 provided on the radially inner side of the second partition wall 43 of the bracket 40. A rear-side solar rotating member 61 is provided at the front end of the shaft 31.

The shaft 31 is provided with a small-diameter step portion 31a whose diameter decreases from the rear side (−Y side) to the front side (+ Y side). In the present embodiment, the small diameter step portion 31a is, for example, a tapered surface. The small-diameter step portion 31a is located in the gap AR11.
The shaft bearing 32 is fitted inside the bearing holding member 45.

  The motor 30 includes a rotor having a shaft 31, a stator, and the like as other components. The motor 30 is not particularly limited, and any motor may be used.

  As the shaft 31 of the motor 30 rotates, the rear-side solar rotating member 61 rotates. The rotation of the rear sun rotating member 61 causes the rear planetary rotating member 62 to rotate and revolve, and the rear planetary carrier 65 rotates. The rotational speed of the rear planetary carrier 65 is such that the number of gears of the rear cylindrical member 60, the number of gears of the rear solar rotating member 61, and the gears of the rear planetary rotating member 62 with respect to the rotational speed of the shaft 31 The speed is changed according to the number. Thereby, the rotational speed of the shaft 31 is changed by the rear planetary transmission mechanism 51.

  As the rear planetary carrier 65 rotates, the front sun rotating member 71 rotates, and the front planetary carrier 75 rotates in the same manner as the rear planetary transmission mechanism 51. The rotational speed of the front planetary carrier 75 is such that the number of gears of the front cylindrical member 70, the number of gears of the front solar rotating member 71, and the front planetary rotating member 72 with respect to the rotational speed of the rear planetary carrier 65. The speed is changed according to the number of gears. As a result, the rotational speed of the rear planetary carrier 65 is changed by the front planetary transmission mechanism 52. As the front planetary carrier 75 rotates, the output shaft 78 rotates at the rotational speed of the front planetary carrier 75.

  As described above, in the drive device 10 of the present embodiment, the rotation of the shaft 31 of the motor 30 is shifted and output by the transmission 20. More specifically, the rotation of the shaft 31 of the motor 30 is shifted in two stages by the rear planetary transmission mechanism 51 and the front planetary transmission mechanism 52 of the transmission unit 50. The transmission 20 may reduce or increase the rotational speed of the shaft 31.

FIG. 6 is an explanatory diagram for explaining the effect of the present embodiment.
As shown in FIG. 6, the grease G injected into the rear planetary speed change mechanism 51 may leak through the shaft 31 to the bracket 40 side.

  On the other hand, according to the present embodiment, since the first partition wall portion 42 that separates the motor 30 and the transmission portion 50 is provided, the leakage of the grease G to the motor 30 can be suppressed. Further, the grease G adhering to the shaft 31 is blown outward in the radial direction by the centrifugal force generated by the rotation of the shaft 31 in the gap AR11. The grease G thus blown off adheres to the partition wall inner surface 43a of the second partition wall 43 as shown in FIG. 6, for example, and is stored in the gap AR11. Thus, according to the present embodiment, it is possible to prevent the grease G leaking from the rear planetary speed change mechanism 51 from leaking to the motor 30 without using an oil seal.

  Moreover, according to this embodiment, the 1st partition part 42 and the support part 44 which supports the rear side washer 66 are parts of a single member. Therefore, an increase in the number of parts of the transmission 20 can be suppressed. Moreover, it can suppress that the assembly man-hour of the transmission 20 increases by this. Therefore, according to this embodiment, it can suppress that the manufacturing cost of the transmission 20 increases, and can suppress that the productivity of the transmission 20 falls.

  As described above, according to the present embodiment, there is provided a transmission having a structure that can suppress leakage of the grease G to the input side member, can suppress an increase in manufacturing cost, and can suppress a decrease in productivity. can get. Moreover, according to this embodiment, a drive device provided with such a transmission can be obtained.

  Moreover, according to this embodiment, the 2nd partition part 43 is a part of the bracket 40 which is a single member. That is, the 1st partition part 42, the 2nd partition part 43, and the support part 44 are parts of the bracket 40 which is a single member. Therefore, an increase in the number of parts can be further suppressed, and an increase in assembly man-hour can be further suppressed.

  Further, according to the present embodiment, the bracket 40 includes the bearing holding member 45 that holds the shaft bearing 32. That is, the shaft bearing 32 that supports the shaft 31 of the motor 30 is held by the transmission 20. Therefore, for example, as compared with a case where a member for holding the shaft bearing 32 is separately provided between the motor 30 and the transmission 20, the accumulation of tolerances between the members can be reduced. Thereby, according to this embodiment, shaft 31 can be arranged with sufficient axial accuracy.

Further, as the grease G is accumulated in the gap AR11, the grease G injected into the rear planetary speed change mechanism 51 decreases. Therefore, the reliability of the lubrication of the rear planetary speed change mechanism 51 may be reduced.
On the other hand, according to the present embodiment, a part of the grease G accumulated in the gap AR11 can be returned again to the rear planetary transmission mechanism 51. Therefore, the reliability of the lubrication of the rear planetary transmission mechanism 51 is improved. Can be improved. Details will be described below.

  In the present embodiment, the partition wall inner side surface 43a of the second partition wall 43 is an inclined surface that is inclined radially outward from the rear side toward the front side. Therefore, as shown in FIG. 6, the grease G blown off by the centrifugal force from the shaft 31 receives a force toward the front side by being pressed radially outward against the inner wall surface 43a of the partition wall. Thereby, a part of grease G adhering to the partition wall inner side surface 43a moves to the front side along the partition wall inner surface 43a.

  In the present embodiment, the front end of the partition wall inner surface 43 a of the second partition wall 43 is provided on the radially outer side than the outer edge of the rear washer 66. Therefore, the rear washer 66 is not provided between the gap AR11 and the rear planetary transmission mechanism 51 at the radially outer end of the gap AR11. That is, the gap AR11 is in direct contact with the space AR2 at the radially outer end. Thereby, a part of the grease G that moves as described above moves from the space AR11 to the space AR2, that is, the rear planetary transmission mechanism 51.

  As described above, a part of the grease G leaking from the rear planetary transmission mechanism 51 into the gap AR11 is supplied to the rear planetary transmission mechanism 51 again. Thus, according to the present embodiment, the grease G of the rear planetary transmission mechanism 51 circulates as shown by the arrows in FIG. Therefore, according to this embodiment, the reliability of the lubrication of the rear planetary transmission mechanism 51 can be improved.

  In addition, according to the present embodiment, the partition wall inner side surface 43a of the second partition wall 43 is located on the radially outer side with respect to the outer edge of the rear washer 66, so that the gap AR11 can be enlarged. Thereby, the amount of grease G stored in the gap AR11 can be increased.

  Further, according to the present embodiment, the support portion 44 that supports the rear washer 66 is provided. Therefore, even when the partition wall inner surface 43a of the second partition wall 43 is disposed radially outside the outer edge of the rear washer 66, the rear washer 66 that supports the rear planetary rotating member 62 and the like is stabilized. Can be supported. Thereby, it can suppress that the rear side washer 66 remove | deviates and mesh | engagement with the rear side planetary rotating member 62 and the rear side solar rotating member 61 comes off, enlarging space | gap part AR11.

  Further, according to the present embodiment, the support portion 44 extends in the radial direction. Therefore, the grease G that is blown radially outward from the shaft 31 is less likely to adhere to the support portion 44. As a result, the grease G tends to adhere to the partition wall inner surface 43 a of the second partition wall 43. Therefore, according to this embodiment, as described above, part of the grease G is likely to circulate. Further, since the grease G tends to be accumulated from the radially outer side in the gap AR11, the grease G can be efficiently accumulated, and the leakage of the grease G to the motor 30 can be further suppressed.

  Moreover, according to this embodiment, since the support part 44 is plate shape extended in radial direction, the grease G does not adhere to the support part 44 more, and the said effect is acquired largely.

  Moreover, according to this embodiment, since the some support part 44 is arrange | positioned at equal intervals along the circumferential direction, the rear side washer 66 can be supported stably.

  Further, according to the present embodiment, since the support portion 44 is connected to the first partition wall portion 42 and the second partition wall portion 43, the strength of the bracket body portion 41 can be improved.

  In addition, according to the present embodiment, the step portion 46 is provided at the front end portion of the support portion 44 so that the radially inner side is concave on the rear side. A rear washer 66 is disposed inside the stepped surface 46a of the stepped portion 46 in the radial direction. Therefore, the position of the outer edge of the rear side washer 66 in the radial direction is limited by the step surface 46a, and the rear side washer 66 is easily positioned in the radial direction.

  Further, according to the present embodiment, the rear washer 66 is fitted into a surface composed of a plurality of step surfaces 46a. Therefore, the rear washer 66 can be positioned more accurately in the radial direction.

  Further, according to the present embodiment, the rear-side carrier pin shaft J2 is located on the radially outer side than the shaft bearing 32. Therefore, the radial distance between the rear carrier pin axis J2 and the central axis J1 can be increased. Thereby, according to this embodiment, the space | gap part AR11 can be enlarged.

  Further, according to the present embodiment, the rear side washer 66 supports the rear side needle bearing 64 from the rear side. Therefore, it is possible to prevent the rear needle bearing 64 from coming off. In particular, when the rear side needle bearing 64 does not have a cage for holding the needle, the needle is easily removed. Therefore, when the rear side needle bearing 64 does not have a cage for holding the needle, the effect of suppressing the rear side needle bearing 64 from coming off can be particularly greatly obtained.

  In addition, according to the present embodiment, the shaft 31 is provided with the small diameter step portion 31a. The grease G adhering to the small-diameter step portion 31 a is shaken off by the centrifugal force generated by the rotation of the shaft 31 and is easily separated from the shaft 31. Therefore, according to the present embodiment, the grease G leaked from the rear planetary transmission mechanism 51 through the shaft 31 is likely to fly off the shaft 31 and adhere to the partition wall inner side surface 43 a of the second partition wall 43. As a result, according to the present embodiment, it is possible to further suppress the grease G from leaking to the motor 30.

  In the present embodiment, the following configuration may be employed.

In the present embodiment, the bracket 40 may not have the bearing holding member 45. That is, in this embodiment, the structure by which the shaft bearing 32 is hold | maintained at the motor 30 may be sufficient.
In the present embodiment, the bearing holding member 45 may be provided as a separate member from the bracket body 41 in the bracket 40.

  In the present embodiment, at least a part of the rear end of the partition wall inner surface 43 a of the second partition wall 43 is radially inward from the outer edge of the rear washer 66 and the rear washer 66. It may be located radially inward from the inner edge. That is, in the present embodiment, a part of the rear end of the partition wall inner surface 43a of the second partition wall 43 may overlap the rear washer 66 when viewed in the axial direction.

  In the present embodiment, a configuration in which at least a part of the front-side end portion of the partition wall inner surface 43 a of the second partition wall 43 is located radially outside the outer edge of the rear washer 66 can be employed. In other words, in the present embodiment, only a part of the front-side end portion of the partition wall inner surface 43 a of the second partition wall 43 may be located radially outside the outer edge of the rear washer 66. In this case, for example, the other part of the front end of the partition wall inner surface 43 a of the second partition wall 43 is radially inward of the outer edge of the rear washer 66 and the rear washer 66. It may be located radially inward from the inner edge. In other words, in the present embodiment, a part of the front side end portion of the partition wall inner surface 43a of the second partition wall 43 may overlap the rear washer 66 as viewed in the axial direction.

In the present embodiment, the partition wall inner surface 43a of the second partition wall 43 may not be an inclined surface. That is, in the present embodiment, the partition wall inner side surface 43a of the second partition wall portion 43 may not be provided with an inclined portion.
Moreover, in this embodiment, the 2nd partition part 43 may have a part which has a surface orthogonal to a radial direction, and an inclined part which has an inclined surface. In this case, the inclined portion is provided at the front end portion of the second partition wall portion 43.

  Further, in the present embodiment, the support portion 44 is provided as a part of a single member together with the first partition wall portion 42 and has any configuration as long as the rear side washer 66 can be supported. Good. For example, the number of the support portions 44 is not particularly limited, and may be 1 or more, 7 or less, or 9 or more. Further, for example, the support part 44 may be configured to be connected to only one of the first partition part 42 and the second partition part 43. Further, for example, the support portion 44 may extend in the circumferential direction.

  Further, in the present embodiment, the bracket 40 is a separate member even if the other part is provided as a single member as long as the first partition wall part 42 and the support part 44 are part of a single member. It may be provided as. As an example, the second partition wall 43 may be provided as a separate member from the first partition wall 42.

In the present embodiment, the support portion 44 may not have the step portion 46.
In the present embodiment, the rear-side carrier pin axis J2 may be located radially inward of the shaft bearing 32.

In the present embodiment, the rear washer 66 may not support the rear needle bearing 64 from the rear side.
Moreover, in this embodiment, the rear side needle bearing 64 does not need to be provided.

  In the above description, the shaft 31 of the motor 30 that is the input side member and the output shaft 78 of the front planetary transmission mechanism 52 are concentric, that is, centered on the central axis J1, but this is not restrictive. In the present embodiment, for example, the output shaft 78 may be centered on another axis parallel to the central axis J1, or may be centered on an axis that intersects the central axis J1.

Further, in the present embodiment, a configuration as shown in FIGS. 7 to 9 may be employed. Each configuration will be described below.
In the following description of each configuration, the description of the same configuration as the above-described configuration may be omitted by appropriately attaching the same reference numerals.

FIG. 7 is a front view showing a bracket 140 as another example of the present embodiment.
As shown in FIG. 7, the bracket 140 has a bracket body 141. The bracket main body 141 includes a first partition wall portion 42, a second partition wall portion 43, and a plurality of support portions 144.

  The support portion 144 is different from the support portion 44 described in FIG. 3 in that the support portion 144 is provided to be separated from the second partition wall portion 43 in the radial direction. Other configurations of the support portion 144 are the same as those of the support portion 44.

Since the support portion 144 is provided to be separated from the second partition wall portion 43 in the radial direction, the air gap AR12 provided inside the second partition wall portion 43 is circumferential in the end portion on the radially outer side. It is connected over one round.
Other configurations of the bracket 140 are the same as those of the bracket 40 described above.

  According to this configuration, it is possible to increase an area in which the space AR <b> 2 in which the gap AR <b> 12 and the rear planetary speed change mechanism 51 are provided is in direct contact without the rear washer 66. Therefore, it is possible to increase the amount of grease G that returns from the gap AR12 to the rear planetary transmission mechanism 51 again.

FIG. 8 is a cross-sectional view showing a drive device 210 which is another example of the present embodiment.
The drive device 210 includes a transmission 220 as shown in FIG. The transmission 220 has a bracket 240. The bracket 240 includes a bracket body 241 and a bearing holding member 45. The bracket main body portion 241 includes a first partition wall portion 42, a second partition wall portion 43, a plurality of support portions 44, and a protruding portion 247. Inside the second partition wall 43, an air gap AR13 is provided. The gap AR13 is the same as the gap AR11 described above.

The protruding portion 247 protrudes from the partition wall front surface 42a of the first partition wall portion 42 to the front side (+ Y side). More specifically, the protruding portion 247 protrudes from the outer edge of the through hole 42b provided in the first partition wall portion 42 to the front side. The protrusion 247 is provided, for example, over one circumference in the circumferential direction. The protruding portion 247 is, for example, cylindrical. The front end of the protruding portion 247 is located on the rear side (−Y side) with respect to the small diameter step portion 31 a of the shaft 31.
The other configuration of the drive device 210 is the same as that of the drive device 10 described in FIG.

  According to this configuration, since the protruding portion 247 is provided, the grease G can be further suppressed from leaking to the motor 30.

  Moreover, according to this structure, the protrusion part 247 is provided in the rear side rather than the small diameter step part 31a. Therefore, it is possible to suppress the grease G from leaking out to the motor 30 without hindering the above-described action of shaking off the grease G by the small diameter step portion 31a.

In this configuration, the protruding portion 247 may be provided in a part of the circumferential direction.
Moreover, in this structure, the protrusion part 247 may extend from the small diameter step part 31a to the front side.
Moreover, in this structure, the shape of the protrusion part 247 is not specifically limited.

FIG. 9 is a cross-sectional view showing a driving device 310 which is another example of the present embodiment.
As shown in FIG. 9, the drive device 310 includes a transmission device 320. The transmission 320 has a bracket 340. The bracket 340 has a bracket body 341. The bracket main body 341 includes a first partition 42, a second partition 43, and a support 344.

Support portion 344 is provided along the circumference of the circumferential direction (theta _Y direction). The support portion 344 has an annular support portion inner side surface 344a. In the present embodiment, the support portion 344 has a cylindrical shape, for example, although illustration is omitted. The support portion 344 is connected to the first partition wall portion 42 and the second partition wall portion 43.

  The support portion inner side surface 344 a is located on the radially inner side from the outer edge of the rear side washer 66 and on the inner side in the radial direction from the inner edge of the rear side washer 66. That is, the support inner surface 344a is provided at a position overlapping the rear washer 66 when viewed in the axial direction (Y-axis direction).

  A concave portion 344b is provided on the inner surface 344a of the support portion. The concave portion 344b is provided, for example, at the center in the axial direction (Y-axis direction) of the support portion 344. The recessed part 344b is provided over the circumference of the circumferential direction, for example. The shape of the recess 344b is, for example, an annular shape.

  Inside the support portion 344, an air gap AR14 is provided. The gap AR14 is located on the radially inner side of the second partition wall 43. In this configuration, the gap AR14 includes a space located on the radially inner side of the support portion inner side surface 344a and a space on the inner side of the recessed portion 344b. The gap AR14 is in direct contact with the space AR2 on the radially inner side of the inner edge of the rear washer 66.

A step portion 346 is provided at an end portion on the front side (+ Y side) of the support portion 344. The step portion 346 is provided over one circumference in the circumferential direction. The step surface 346a of the step portion 346 has an annular shape orthogonal to the radial direction. The support surface 346b of the stepped portion 346 has an annular shape orthogonal to the axial direction (Y-axis direction). A rear washer 66 is fitted to the step surface 346a. A rear washer rear surface 66b of the rear washer 66 is in contact with the support surface 346b. Thereby, the support part 344 supports the rear side washer 66 from the rear side.
The other configuration of the drive device 310 is the same as that of the drive device 10 described in FIG.

  According to this configuration, the support portion 344 has the annular support portion inner side surface 344a. That is, the support part 344 is provided over the circumference of the circumferential direction. Therefore, the rear washer 66 can be supported more stably by the support portion 344.

  Moreover, according to this structure, since the recessed part 344b is provided in the support part inner surface 344a of the support part 344, the space | gap part AR14 can be enlarged.

In this configuration, the position and shape of the recess 344b are not particularly limited.
In this configuration, a plurality of recesses 344b may be provided.

  In each of the above-described configurations, the transmission has two planetary transmission mechanisms, but is not limited thereto. The present invention can also be applied to a transmission provided with one or more planetary transmission mechanisms.

  In each of the above-described configurations, the planetary speed change mechanism is a planetary gear mechanism, but is not limited thereto. The present invention can also be applied to a transmission provided with a planetary transmission mechanism using a friction wheel, for example.

  Moreover, in each structure demonstrated above, although the input side member provided in a drive device was used as the motor, it is not restricted to this. The present invention can also be applied to a drive device including, as an input side member, a drive machine in which a shaft is rotationally driven by, for example, hydraulic pressure, air pressure, heat, or the like.

  Moreover, each structure demonstrated above can be suitably combined in the range which is not mutually contradictory.

  DESCRIPTION OF SYMBOLS 10,210,310 ... Drive device, 20,220,320 ... Transmission, 30 ... Motor (input side member), 31 ... Shaft, 32 ... Shaft bearing, 40, 140, 240, 340 ... Bracket, 41, 141 241, 341 ... bracket main body part, 42 ... first partition part, 42 b ... through hole, 43 ... second partition part, 43 a ... inner surface of the partition part, 44, 144, 344 ... support part, 45 ... bearing holding member, 46,346 ... stepped portion, 46a, 346a ... stepped surface, 50 ... transmission portion, 51 ... rear planetary transmission mechanism (planetary transmission mechanism), 61 ... rear side solar rotating member (solar rotating member), 62 ... rear planetary Rotating member (planetary rotating member), 63 ... rear side carrier pin (carrier pin), 64 ... rear side needle bearing (needle bearing), 66 ... rear side washer (washer) 344a ... supporting portion side, 344b ... recess, AR11, AR12, AR13, AR14 ... void portion, AR2 ... space, J1 ... center axis, J2 ... rear carrier pin shaft (carrier pin axis)

Claims (13)

A transmission device attached to an input side member having a shaft centering on a central axis extending in one direction, and a shaft bearing supporting the shaft,
A bracket to which the input side member is attached to one side in the one direction;
A transmission provided on the other side of the bracket in the one direction;
With
The transmission unit is
A plurality of planetary rotating members constituting a planetary speed change mechanism together with a sun rotating member provided at the one end of the shaft;
A washer for supporting the plurality of planetary rotating members from the one side;
Have
The bracket has a bracket body portion to which the input side member is attached,
The bracket body is
A first partition wall having a through-hole into which the shaft is inserted, and separating the input side member and the transmission unit;
A second partition wall portion protruding from the other side surface of the first partition wall portion and having an annular partition wall inner surface;
A support portion that is located radially inside the second partition wall portion and supports the washer from the one side;
Have
The first partition part and the support part are parts of a single member,
On the inner side in the radial direction of the second partition wall, a gap is provided,
The transmission is characterized in that the gap is connected to a space in which the sun rotating member and the planetary rotating member are arranged. The bracket has a bearing holding member that holds the shaft bearing;
The transmission according to claim 1, wherein the bearing holding member is provided on the one side of the first partition wall portion in the bracket main body portion. At least a part of the one side end portion of the second partition wall portion on the inner surface of the partition wall portion is located on a radially outer side than an outer edge of the washer,
An inclined portion is provided on the inner surface of the partition wall of the second partition wall,
3. The transmission according to claim 1, wherein the inclined portion extends while being inclined radially inward from the end portion located radially outside the outer edge toward the other side. The support portion has an annular support portion inner surface;
The transmission according to any one of claims 1 to 3, wherein a concave portion is provided on an inner surface of the support portion of the support portion.   5. The transmission according to claim 1, wherein an inner side surface of the partition wall portion of the second partition wall portion is located on a radially outer side than an outer edge of the washer.   The transmission according to any one of claims 1 to 5, wherein the support portion extends in a radial direction.   The transmission according to any one of claims 1 to 6, wherein the support portion is connected to the first partition wall portion and the second partition wall portion.   The transmission according to any one of claims 1 to 7, wherein the support portion is provided to be separated from the second partition wall portion in the radial direction. The bracket body portion has a plurality of the support portions,
The transmission according to any one of claims 1 to 8, wherein the plurality of support portions are arranged at equal intervals along a circumferential direction of the central axis. On the other end portion of the support portion, a stepped portion is provided in which the radially inner side is concave on the one side,
The transmission according to any one of claims 1 to 9, wherein the washer is disposed on a radially inner side of a step surface that intersects a radial direction of the stepped portion.   The transmission according to any one of claims 1 to 10, wherein a carrier pin shaft of a carrier pin that supports the planetary rotation member is located radially outside the shaft bearing. In the radial direction, a needle bearing is provided between the planetary rotating member and a carrier pin that supports the planetary rotating member,
The transmission according to any one of claims 1 to 11, wherein the washer supports the needle bearing from the one side. A motor as the input member;
The transmission according to any one of claims 1 to 12,
A drive device comprising:

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