JP6668208B2 - Rotating device - Google Patents

Description

  The present invention relates to a rotating device.

  Patent Literature 1 discloses a rotating device configured as an eccentric oscillating type speed reducer.

  The rotating device includes an input shaft, an output shaft, and a casing that supports the output shaft. The casing supporting the output shaft is provided between a shaft hole from which the output shaft protrudes, an installation portion for installing the casing on an external member (for example, a floor of a factory), and a periphery of the shaft hole and the installation portion. And a leg. Reinforcing ribs protrude from the legs in the axial direction.

JP-A-2006-84864 (FIG. 2)

  Making the casing light and strong is one of the fundamental issues of this type of rotating device. It has been pointed out that the conventional rotating device still has a problem that the weight of the entire casing is large.

  The present invention has been made to solve such a conventional problem, and has as its object to obtain a rotating device capable of securing higher strength while suppressing an increase in weight.

The present invention is a rotating device including a shaft and a casing that supports the shaft, wherein the casing has a shaft hole from which the shaft projects, and a mounting portion for mounting the casing to an external member. A leg provided between the peripheral portion of the shaft hole and the mounting portion, and a reinforcing rib protruding in the axial direction from the leg portion, wherein the reinforcing rib has a peripheral portion of the shaft hole. Between the mounting portion, a first portion positioned on the peripheral edge side of the shaft hole, a second portion positioned on the mounting portion side, and a second portion positioned between the first portion and the second portion. And when the reinforcing ribs are projected on a plane perpendicular to an axis, the angle between the first part and the installation surface of the installation part is θ1, the second part and the installation part are When the angle formed by the installation surface of the third portion is θ2, and the angle formed by the installation surface of the third portion and the installation portion is θ3 In a manner θ1>θ2> θ3 is satisfied, a shape protruding from the leg portion in the axial direction through the axial center of the shaft, and, when a plane perpendicular to the central plane to the mounting surface, The angles θ1, θ2, and θ3 are angles on the center surface side among angles formed by the first portion, the second portion, and the third portion with the installation surface, and the leg portion is the installation portion. The above-mentioned problem has been solved by adopting a configuration in which the distance from the center plane increases as approaching the portion .

  In the present invention, the reinforcing rib projecting in the axial direction from the leg portion has a first portion, a second portion, and a third portion between the peripheral portion of the shaft hole and the installation portion. Then, the first angle θ1 between the first portion located on the peripheral edge side of the shaft hole and the installation surface of the installation portion, the second angle θ2 between the second portion located on the installation portion side and the installation surface of the installation portion, The third angle θ3 between the third part located between the first part and the second part and the installation surface of the installation part is shaped to decrease in this order.

  Thus, it is possible to obtain a rotating device capable of securing higher strength while suppressing an increase in weight.

  According to the present invention, it is possible to obtain a rotating device capable of securing higher strength while suppressing an increase in weight.

Sectional drawing which shows the whole structure of the reduction gear (rotating device) which concerns on an example of embodiment of this invention. FIG. 2 is a perspective view of the reduction gear transmission of FIG. 1 is a perspective view of the reduction gear transmission of FIG. FIG. 2 is a perspective view of the reduction gear transmission shown in FIG. 1 is a perspective view of the reduction gear transmission of FIG. Left side view of the reduction gear of FIG. Front view of the reduction gear of FIG. 1 FIG. 1 is a plan view of the speed reducer shown in FIG. Bottom view of the reduction gear of FIG. 1 Right side view of the reduction gear of FIG. Rear view of the reduction gear of FIG. FIG. 2 is a perspective view of the output shaft casing of the reduction gear transmission of FIG. The perspective view which looked at the output shaft casing of the reduction gear of Drawing 1 from diagonally above on the non-load side. Left side view of the output shaft casing of the reduction gear transmission of FIG. 1. Front view of the output shaft casing of the reduction gear of FIG. FIG. 2 is a plan view of an output shaft casing of the reduction gear transmission of FIG. 1. Bottom view of the output shaft casing of the reduction gear of FIG. 1 1. Sectional drawing along the XVIII-XVIII line in FIG. Sectional view along the XIX-XIX line of FIG. 18. Sectional view along the line XX-XX in FIG. Perspective view of a reduction gear with a motor according to another application example of the reduction gear when viewed from obliquely above the load side. 21 is a perspective view of the reduction gear transmission shown in FIG. Left side view of the reduction gear of FIG. Front view of the reduction gear of FIG. 21 FIG. 21 is a plan view of the speed reducer of FIG. 21. Bottom view of the reduction gear of FIG. Right side view of the reduction gear of FIG. Rear view of the reduction gear of FIG. 21

  Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a cross-sectional view showing the overall configuration of a reduction gear transmission according to an embodiment of the present invention, FIGS. 2 to 5 are perspective views of the reduction gear transmission viewed from four directions, and FIGS. FIG. 12 and FIG. 13 are perspective views of the output shaft casing of the reduction gear transmission viewed from two directions, FIG. 14 to FIG. 17 is a four-sided view of the left side surface, front surface, flat surface, and bottom surface of the output shaft casing.

  First, a description will be given of a configuration of a reduction mechanism of an eccentric oscillating reduction gear (rotating device) according to an example of an embodiment of the present invention.

  Mainly referring to FIG. 1, the present reduction gear transmission 12 includes two external gears 14 arranged side by side in the axial direction, and an internal gear 16 meshing with the external gear 14. In this example, the internal gear 16 includes an internal gear main body 16A integrated with the speed reduction mechanism casing 18, a support pin 16B incorporated in the internal gear main body 16A, and an externally rotatable externally attached to the support pin 16B. And an internal gear roller 16 </ b> C that is fitted and forms the internal gear of the internal gear 16. The number of teeth of the internal gear 16 is only slightly (in this example, one) greater than the number of teeth of the external gear 14.

  Further, the reduction gear transmission 12 includes a plurality (three in this example) of crankshafts 20 arranged at positions offset from the axis C16 of the internal gear 16. Each crankshaft 20 is driven via an input pinion 24 provided on the input shaft 22 and three distribution gears 26 meshing with the input pinion 24 simultaneously. The crankshaft 20 can swing and rotate the external gear 14 via an eccentric body 28 and an eccentric body bearing 30 provided on the crankshaft 20.

  A carrier 32 and an output flange 34 are arranged on both sides in the axial direction of the external gear 14 so as to face each other. The carrier 32 and the output flange 34 are connected by a carrier pin (connection member) 36. The crankshaft 20 is supported by the carrier 32 and the output flange 34 via a crank bearing 38. The output flange 34 is integrated with the output shaft 40 of the reduction gear 12 (integrated with the same material). The output shaft 40 is rotatably supported by the output shaft casing 46 by a pair of output shaft bearings (a load-side output shaft bearing 88 and a non-load-side output shaft bearing 92: described later).

  The casing Ca1 of the reduction gear transmission 12 mainly includes the reduction mechanism casing 18 that houses the reduction mechanism 17, the input shaft casing 44 that mainly stores the input shaft 22, the output shaft casing 46 that mainly stores the output shaft 40, and an output shaft. And a cover casing 47 that covers the load side of the shaft casing 46.

  The speed reduction mechanism casing 18 accommodates the speed reduction mechanism 17 of the present speed reduction device 12, and is formed in a ring shape having a large radial thickness. As described above, the reduction gear casing 18 also serves as the internal gear main body 16 </ b> A of the internal gear 16.

  The input shaft casing 44 is connected to the non-load side end face 18A of the reduction mechanism casing 18 by a communication bolt 42. The input shaft casing 44 has a stepwise small diameter on the non-load side. An input shaft bearing 48 for supporting the input shaft 22 is disposed in a portion having a smaller diameter by utilizing a shape having a smaller diameter toward the non-load side, and an input oil seal 50 is incorporated in a portion having a smallest diameter. ing.

  Further, a fan 52 and a fan cover 54 driven by rotation of the input shaft 22 using a space P1 generated by the sequentially reduced diameter are incorporated. The fan cover 54 is fixed to the non-load side end surface 44 </ b> A of the input shaft casing 44 via a bolt 56 and a spacer 58. A large number of suction holes 54B for sucking air are formed in the non-load side surface 54A of the fan cover 54 (see FIGS. 3 and 5).

  The output shaft casing 46 is jointly connected to the load-side end face 18B of the reduction mechanism casing 18 by the communication bolt 42 (connecting the input shaft casing 44). The output shaft casing 46 will be described later in detail.

  The cover casing 47 is attached to the load-side end surface 46B of the output shaft casing 46 via a cover bolt 60. An output-side oil seal 64 is arranged between the inner circumference of the cover casing 47 and the outer circumference of the bush 62 incorporated in the output shaft 40.

  In the reduction gear (rotary gear) 12 according to the present embodiment, the present invention is applied to a portion of an output shaft casing 46 that supports the output shaft 40. In other words, in the present reduction gear transmission 12, the output shaft 40 corresponds to the "shaft" according to the present invention, and the output shaft casing 46 corresponds to the "casing" according to the present invention.

  The output shaft casing 46 includes a main body 68 that forms the outer periphery of the output shaft casing 46, a shaft hole 70 from which the output shaft 40 projects, and a mounting portion for mounting the output shaft casing 46 on a base floor (external member) 74. 76, a leg 78 provided between the shaft hole peripheral portion (peripheral portion of the shaft hole 70) 72 and the mounting portion 76, and a reinforcing rib 80 projecting from the leg 78 in the axial direction.

  Hereinafter, the configuration of the output shaft casing 46 will be described more specifically.

  The main body 68 of the output shaft casing 46 is formed in a substantially cylindrical shape. A ring-shaped flange 85 protruding outward in the radial direction is continuously provided at the non-load side end of the main body 68. The output shaft casing 46 is connected to the load-side end face 18B of the speed reduction mechanism casing 18 by the communication bolt 42 via the flange portion 85. A ring-shaped wall 84 is formed continuously at the load-side end of the main body 68 so as to protrude radially inward.

  The output shaft casing 46 has a shaft hole 70 at the center of the wall portion 84 in the radial direction from which the output shaft 40 projects. The shaft hole 70 of the output shaft casing 46 (corresponding to the casing of the present invention) corresponds to the “shaft hole of the casing” according to the present invention (the shaft hole 47A of the cover casing 47 corresponds to the present invention). And “shaft hole of the casing”). Therefore, the shaft hole peripheral portion (peripheral portion of the shaft hole 70) 72 means the peripheral portion (periphery) of the shaft hole 70 in the wall portion 84 of the output shaft casing 46.

  The output shaft casing 46 has a mounting portion 76 for mounting the output shaft casing 46 on a base floor 74 as an external member. In this embodiment, a pair of the mounting portions 76 are provided in parallel with the output shaft 40 (that is, in parallel with the main body portion 68) separately from the main body portion 68. Each of the pair of mounting portions 76 has a mounting surface 94 that comes into contact with the base floor 74. The mounting surface 94 is perpendicular to a surface (hereinafter, simply referred to as a central surface) Vp passing through the axis C40 of the output shaft 40 (concentric with the axis C16 of the internal gear 16) and passing through the center of the pair of mounting surfaces 94. (Installation surface 94⊥central surface Vp). Note that, since the reduction gear transmission 12 is not necessarily installed on a horizontal base floor, the center plane Vp may not be vertical when installed.

  The output shaft casing 46 includes a leg 78 between the shaft hole peripheral edge 72 and the mounting portion 76. Since there are a pair of installation portions 76, a pair of leg portions 78 is also provided. In this example, the leg portion 78 connects the shaft hole peripheral portion 72 and the mounting portion 76 in a mode in which the leg portion is slightly opened, that is, in a mode in which the leg portion 78 moves away from the center plane Vp as approaching the mounting portion 76 from the shaft hole peripheral portion 72. are doing. The leg 78 is formed of a hollow member in this example. However, the legs may be formed of solid members. The pair of leg portions 78 and the mounting portion 76 are formed symmetrically with respect to the center plane Vp.

  The output shaft casing 46 includes a reinforcing rib 80 that protrudes from the leg portion 78 in the axial direction.

  Referring mainly to FIGS. 2 and 6, the reinforcing rib 80 includes a first portion 81 located on the shaft hole peripheral edge 72 side, between the shaft hole peripheral edge portion 72 and the mounting portion 76, and a mounting portion 76 side. And a third portion 83 located between the first portion 81 and the second portion 82.

  Now, in the case where the reinforcing rib 80 is projected on a plane perpendicular to the output shaft 40 (the plane in FIG. 6), the first angle between the first portion 81 of the reinforcing rib 80 and the installation surface 94 is θ1, and the second part 82 is The second angle formed by the installation surface 94 is defined as θ2, and the third angle formed by the third portion 83 and the installation surface 94 is defined as θ3. At this time, the reinforcing rib 80 has a shape that protrudes in the axial direction from the leg 78 in such a manner that the first angle θ1> the second angle θ2> the third angle θ3 is satisfied.

  Here, the “first angle θ1 between the first portion 81 of the reinforcing rib 80 and the installation surface 94” is “the center plane Vp side of the reinforcing rib 80 (the center plane Vp exists with respect to the reinforcing rib 80). Side), the angle between the first portion 81 of the reinforcing rib 80 and the mounting surface 94 ”. That is, the angle formed by the first portion 81 of the reinforcing rib 80 and the installation surface 94 includes an angle θ1 on the center plane Vp side and an angle θ1s on the opposite center plane side corresponding to the supplementary angle. , The angle on the side of the center plane Vp is defined as a first angle θ1.

  Similarly, the second angle θ2 between the second portion 82 and the installation surface 94 is defined as “the angle between the second portion 82 and the installation surface 94 on the center plane Vp side of the reinforcing rib 80”. The third angle θ3 between the third portion 83 and the installation surface 94 is defined as “the angle between the third portion 83 and the installation surface 94 on the center plane Vp side of the reinforcing rib 80”.

  The first angle θ <b> 1 to the third angle θ <b> 3 are defined by “the outer first surface 81 </ b> P to the third surface 83 </ b> P on the opposite side to the center surface in the first part 81 to the third part 83 of the reinforcing rib 80 and the installation surface 94. Angle ". This is because the “outer first surface 81P to the outer third surface 83P on the side opposite to the center surface side” has a higher strength than the “inner first surface 81Q to the inner third surface 83Q on the center surface Vp side”. This is because it has a strong effect.

  In other words, “the first angle θ1 to the third angle θ3 formed by the outer first surface 81P to the outer third surface 83P on the side opposite to the center surface and the installation surface 94” is the “first angle θ1> second angle”. If the condition of θ2> third angle θ3 ”is satisfied,“ the angle between the inner first surface 81Q on the center plane Vp side to the inner third surface 83Q and the installation surface 94 ”is not necessarily in this order. It is not necessary.

  In this embodiment, a so-called chamfering process (corner fillet of a casting) is performed on the reinforcing rib 80. The concept of the first angle θ <b> 1 to the third angle θ <b> 3 and the outside first surface 81 </ b> P to the outside third surface 83 </ b> P in the present embodiment does not include the angle of the chamfered portion or the chamfered surface.

  In this embodiment, the reinforcing rib 80 having the first part 81 to the third part 83 to the second part 82 is formed by casting (from the beginning). The first portion 81 and the third portion 83 of the reinforcing rib 80 and the third portion 83 and the second portion 82 are smoothly (curvilinearly) continuous. However, the manufacturing method of the reinforcing rib 80 is not particularly limited to this method. For example, the first portion 81 to the third portion 83 to the second portion 82 may be formed by bending one thick plate material.

  The reinforcing ribs 80 are solid in this example. That is, there is no cavity inside the reinforcing rib 80. However, the inside of the reinforcing rib 80 may be hollow. Further, in this example, the reinforcing ribs 80 are integrally formed with a single material from the beginning together with the leg portions 78 and the mounting portions 76. However, the reinforcing ribs 80 may be formed separately from the leg portions 78 and the mounting portions 76 so as to be connected later.

  2 and 7, the reinforcing ribs 80 have a substantially triangular shape when viewed from a direction perpendicular to the center plane Vp. That is, the amount of protrusion Pa of the reinforcing rib 80 from the leg 78 in the axial direction is formed so as to increase as the position approaches the leg 78 and to gradually decrease as the position approaches the shaft hole peripheral portion 72. That is, the axially projecting amount Pa of the reinforcing rib 80 from the leg 78 is as follows: the second portion 82> the third portion 83> the first portion 81.

  Then, the axially projecting amount Pa of the reinforcing rib 80 from the leg portion 78 becomes 0 at the end 81 </ b> E of the first portion 81 on the shaft hole peripheral edge 72 side, and becomes 0 on the shaft hole peripheral edge 72 side of the first portion 81. End 81E is flush with the shaft hole peripheral edge 72.

  On the other hand, the output shaft casing 46 supports the output shaft 40 by a load-side output shaft bearing 88 arranged in the load-side bearing arrangement part 86 and a non-load-side output shaft bearing 92 arranged in the non-load-side bearing arrangement part 90. are doing. In this example, the load-side output shaft bearing 88 and the non-load-side output shaft bearing 92 are configured by tapered roller bearings that are assembled back to back.

  Here, the configuration of the non-load-side bearing arrangement section 90 will be described more specifically.

  18 is a sectional view taken along the line XVIII-XVIII of FIG. 1, FIG. 19 is a sectional view taken along the line XIX-XIX of FIG. 18, and FIG. 20 is a sectional view taken along the line XX-XX of FIG. It is sectional drawing which follows. FIG. 19 is a cross-sectional view of a portion where the connecting portion 95 of the non-load side bearing arrangement portion 90 is connected (a portion where a cross section of the connecting portion 95 appears), and FIG. 20 is a portion where the connecting portion 95 is not connected (the connecting portion 95). (A section where no cross-section appears).

  Referring to FIG. 1 as well as these sectional views and the perspective view of FIG. 13, as described above, the main body 68 of the output shaft casing 46 forms the outer periphery of the output shaft casing 46 and has a substantially cylindrical shape. Is formed. The non-load-side bearing arrangement portion 90 is provided in a ring shape so as to be separated radially inward from the main body portion 68. And the connection part 95 is provided in the circumferential direction at intervals, and connects the inner periphery of the main-body part 68 and the outer periphery of the non-load-side bearing arrangement part 90 in the radial direction. The non-load-side bearing arrangement portion 90 has a polygonal shape (a regular octagon in this example) on the radially outer side in a cross section perpendicular to the axis. The connecting portion 95 connects the inner periphery of the main body 68 and the central portions 90 a to 90 h of eight sides of the outer periphery of the non-load-side bearing arrangement portion 90. That is, the radial thickness (each distance from the non-load-side bearing disposition portion 90 to the central portions 90a to 90h of the eight sides of the regular octagon) W90a of the portion where the connecting portion 95 of the non-load-side bearing disposition portion 90 is connected. Is smaller than the radial thickness (each distance from the non-load-side bearing arrangement portion 90 to the corners 90A to 90H of the eight sides of the regular octagon) W90A at the portion where the connecting portion 95 is not connected.

  The load-side bearing arrangement portion 86 of the output shaft casing 46 is formed on an inner periphery of the shaft hole 70 formed in a wall portion 84 protruding radially inward from the main body portion 68. A step portion 70S is provided on the inner periphery of the shaft hole 70, and regulates the axial position of the load-side output shaft bearing 88 arranged in the load-side bearing arrangement portion 86.

  Here, the structure of the outer periphery of the main body 68 of the output shaft casing 46 will be described. In particular, as clearly shown in FIGS. 2, 6, and 14, the main body 68 of the output shaft casing 46 is provided with a first built-up portion 98 in which the oil supply port 96 of the reduction gear 12 is provided, and the oil gauge 100. It has a second build-up portion 104 on which the mounting portion 102 is provided, and a third build-up portion 106 provided between the first build-up portion 98 and the second build-up portion 104.

  The first built-up portion 98 of the main body 68 is formed in an oval shape along the axial direction at the uppermost portion of the output shaft casing 46. An oil supply port 96 is provided on the most loaded side of the first overlay 98.

  The second built-up portion 104 of the main body 68 is formed slightly above an oil surface (both not shown) of the oil sealed in the main body 68. The (upper) mounting part 102 of the oil gauge 100 is provided on the most load side of the second built-up part 104. The leg 78 is provided with a (lower) mounting portion 103 of the oil gauge 100.

  In this example, two third overlaying portions 106 of the main body 68 are provided between the first overlaying portion 98 and the second overlaying portion 104, that is, four in total. The four third built-up portions 106 are provided on the upper half of the main body 68, and are not provided on the lower half of the main body 68. The third overlay 106 is formed to further increase the strength of the main body 68.

  The third build-up portion 106 has a shape corresponding to a half of an ellipse when the third build-up portion 106 is viewed from the outside in the radial direction. The third built-up portion 106 is formed so that the height of the built-up portion gradually increases toward the flange portion 85 formed so as to protrude outward in the radial direction at the non-load side end of the main body portion 68. The inside of the third overlay 106 is solid. That is, the thickness of the main body 68 is increased by the thickness of the third overlay 106 at the third overlay 106 (see FIG. 19).

  In the present embodiment, in particular, the third build-up portion 106 is formed at an axial position corresponding to the radially outer side of the non-load-side bearing arrangement portion 90 (when viewed from the radial direction, the third build-up portion 106 is formed). And the non-load-side bearing arrangement portion 90 overlaps).

  In addition, from the flange portion 85 of the output shaft casing 46, a lower extension portion 85A extends from the flange portion 85 in a state where the skirt is extended downward. The lower extension 85A is connected to the installation part 76. From the lower extension portion 85A, a vertically large vertical rib 120 connected to the opposite end of the installation portion 76 on the side opposite to the center plane is integrally extended to the axially non-load side. From the lower extension 85A, an axially large vertical rib 122 connected to the center plane Vp side of the installation portion 76 is integrally extended to the axially non-load side.

  Next, the operation of the reduction gear transmission 12 according to the present embodiment will be described.

  The deceleration operation of the speed reduction device 12 will be described. The rotation of the input shaft 22 is transmitted to each crankshaft 20 via the input pinion 24 and the distribution gear 26. As a result, the eccentric body 28 provided on each crankshaft 20 rotates in the same direction at the same rotation speed, and the external gear 14 externally fitted to the eccentric body 28 via the eccentric body bearing 30 swings. I do. The external gear 14 is internally meshed with the internal gear 16, and the number of teeth of the internal gear 16 is one more than the number of teeth of the external gear 14. Therefore, each time the external gear 14 swings once (every time the crankshaft 20 rotates once), the external gear 14 moves with respect to the internal gear 16 integrated with the reduction mechanism casing 18. Then, it relatively rotates (rotates) by the number of teeth difference (for one tooth). By this rotation, the carrier 32 and the output flange 34 supporting the crankshaft 20 are integrally rotated as one large carrier body via the carrier pin 36. In this reduction gear transmission 12, since the output flange 34 is integrated with the output shaft 40, the rotation of the output flange 34 causes the output shaft 40 to rotate.

  As described above, in the present reduction gear transmission 12, a load that changes in a complicated manner is generated in accordance with the swing of the external gear 14 (a load different from a continuous load due to mere rotation is generated). The output shaft casing 46 receives the complicatedly changing load via the speed reduction mechanism casing 18, the load-side output shaft bearing 88 supporting the output shaft 40, and the non-load-side output shaft bearing 92.

  The output shaft casing 46 is fixed to a base floor 74 as an external member via a leg 78 and a mounting portion 76. In other words, by fixing the output shaft casing 46 to the base floor 74, the output shaft casing 46 needs to have sufficient strength (rigidity) to provide a stable reaction force to these loads.

  Referring again to FIG. 6, in the present embodiment, a reinforcing rib 80 is provided on a leg 78 provided between the shaft hole peripheral edge 72 of the main body 68 and the mounting portion 76. The reinforcing rib 80 includes a first portion 81 located on the shaft hole peripheral edge 72 side, a second portion 82 located on the installation portion 76 side, and the first portion 82 between the shaft hole peripheral edge portion 72 and the installation portion 76. And a third portion 83 located between the portion 81 and the second portion 82.

  The angle between the first outer surface 81P of the first portion 81 and the installation surface 94 is a first angle θ1, the angle between the second outer surface 82P of the second portion 82 and the installation surface 94 is a second angle θ2, and the third angle θ2. When the angle formed between the outer third surface 83P of the portion 83 and the installation surface 94 is a third angle θ3, the reinforcing ribs 80 are configured such that the first angle θ1> the second angle θ2> the third angle θ3 is satisfied. It protrudes from the leg 78 in the axial direction.

  Therefore, for example, compared with a simple linear reinforcing rib 80, the leg 78 can be effectively reinforced, and the reaction force can be efficiently received from the base floor 74 side. Specifically, it has been confirmed by FEM analysis that the maximum displacement of the main body 68 of the output shaft casing 46 can be reduced by about 8%.

  Further, the output shaft casing 46 of the reduction gear transmission 12 has a ring-shaped anti-load side bearing in which a non-load side output shaft bearing 92 which is provided radially inward from the main body portion 68 and supports the output shaft 40 is arranged. It has an arrangement part 90 and a plurality of connection parts 95 provided at intervals in the circumferential direction and connecting the main body part 68 and the non-load-side bearing arrangement part 90. In the reduction gear transmission 12, the radial thickness W90a of the portion where the connecting portion 95 is connected is formed smaller than the radial thickness W90A of the portion where the connecting portion 95 is not connected. For this reason, even if the connecting portions 95 are provided at intervals in the circumferential direction, it is possible to suppress a decrease in the strength of a portion where the connecting portion 95 is not connected (a portion where the connecting portion 95 does not exist), and the overall strength is reduced. The weight of the output shaft casing 46 can be reduced while suppressing the reduction.

  The main body 68 of the output shaft casing 46 includes a first build-up portion 98 in which the oil supply port 96 of the reduction gear 12 is provided, a second build-up portion 104 in which the mounting portion 102 of the oil gauge 100 is provided, And a third overlay 106 provided between the first overlay 98 and the second overlay 104. Therefore, the strength of the output shaft casing 46 can be maintained higher.

  In the present embodiment, the third build-up portion 106 is formed at an axial position corresponding to the radially outer side of the non-load-side bearing arrangement portion 90 (when viewed from the radial direction, the third build-up portion 106 is formed). 106 and the non-load-side bearing arrangement portion 90 overlap). Therefore, even if the connecting portions 95 of the non-load-side bearing arrangement portion 90 are provided at intervals in the circumferential direction, the strength near the connecting portion 95 can be maintained higher.

  In addition, the axially projecting amount Pa of the reinforcing rib 80 from the leg portion 78 in the present embodiment is formed to be larger as it is closer to the installation portion 76 and smaller as it is closer to the shaft hole peripheral portion 72. In other words, the axial projection amount Pa of the reinforcing rib 80 from the leg portion 78 is determined as the second portion 82> the third portion 83> the first portion 81. In particular, the axial projection amount Pa is 0 at the end portion 81E of the first portion 81 on the shaft hole peripheral edge 72 side, and the end portion 81E of the first portion 81 on the shaft hole peripheral edge 72 side is equal to the axial hole peripheral portion. It is flush with the part 72. For this reason, it is possible to reduce the weight of the reinforcing rib 80 itself while maintaining a particularly strong strength in the vicinity of the installation portion 76 of the leg portion 78, and thus to reduce the weight of the entire device.

  In the above embodiment, eight connecting portions 95 are provided at substantially equal intervals in the circumferential direction. However, the cross-sectional shape, the number, and the form of the connecting portion are not limited thereto, and for example, other than eight. May be used. The mode of formation of the connecting portions does not necessarily have to be at equal intervals in the circumferential direction.

  Next, another application example of the present invention will be described.

  In the embodiment of FIGS. 1 to 20, the present invention is applied to the speed reducer 12 with the fan 52. In the embodiment of FIGS. 21 to 28, the present invention is applied to the reduction gear 112 with the motor 116.

  21 and 22 are perspective views of the speed reducer 112 with the motor 116 viewed from two directions. FIGS. 23 to 28 are left side, front, plane, and bottom views of the speed reducer 112 with the motor 116. It is a 6-side view of the right side and the back.

  In the speed reducer 112 with the motor 116, the flange 118 of the motor casing 114 is connected to the speed reduction mechanism casing 18 via the connection bolt 119. Note that the input shaft casing 44 in the previous embodiment is not provided, and the flange portion 118 of the motor casing 114 is directly connected to the reduction mechanism casing 18.

  Further, the input shaft 22 of the previous embodiment is not provided, and instead, the motor shaft (not shown) of the motor 116 is extended to the inside of the speed reduction mechanism, and also functions as the input shaft of the speed reduction device 112. are doing. Further, the fan 52 of the previous embodiment is also omitted, and a fan (not shown: only the fan cover 124 is shown) is mounted on the non-load side of the motor 116 instead.

  In the speed reducer 112 with the motor 116, since the weight of the motor 116 is cantilevered on the output shaft casing 46 via the speed reduction mechanism casing 18, the load side of the connecting portion 95 between the leg 78 and the mounting portion 76 is provided. The load applied to the end tends to be particularly large. Therefore, the above-described configuration in which the axially projecting amount Pa of the reinforcing rib 80 from the leg portion 78 is formed to be larger as being closer to the installation portion 76 and smaller as being closer to the shaft hole peripheral portion 72 is particularly effective. This is an application example that functions as follows.

  Other configurations are the same as those of the previous embodiment. Therefore, the same or substantially the same portions in the drawings are denoted by the same reference numerals, and redundant description will be omitted.

  In the above-described embodiment, an example in which the present invention is applied to the output system of the eccentric oscillating reduction gear is shown. However, the basic configuration of the rotating device according to the present invention is not limited thereto. In short, the function of the shaft is not particularly limited to the output shaft as long as the shaft and the casing that supports the shaft are provided. For example, it may be an input shaft. The speed reduction mechanism to be combined is not particularly limited to the eccentric swing type speed reduction mechanism.

DESCRIPTION OF SYMBOLS 12 ... Reduction gear 40 ... Output shaft 46 ... Output shaft casing 68 ... Body part 70 ... Shaft hole 72 ... Shaft hole peripheral part 74 ... Base floor (external member)
76 installation part 78 leg part 80 reinforcing rib 81 first part 82 second part 83 third part 94 installation surface θ1 to θ3 first to third angles

Claims (5)

A rotating device including a shaft and a casing that supports the shaft,
The casing has a shaft hole from which the shaft projects, an installation portion for installing the casing on an external member, a leg portion provided between a peripheral portion of the shaft hole and the installation portion, And a reinforcing rib projecting in the axial direction from
The reinforcing rib includes a first portion located on the side of the peripheral portion of the shaft hole, a second portion located on the side of the mounting portion, between the peripheral portion of the shaft hole and the installation portion, and the first portion. A third portion positioned between the first portion and the second portion, and wherein the reinforcing rib forms the first portion and a mounting surface of the mounting portion when projected on a plane perpendicular to an axis. When an angle is θ1, an angle between the second portion and the installation surface of the installation portion is θ2, and an angle between the third portion and the installation surface of the installation portion is θ3, θ1>θ2> θ3 holds. In an aspect, the leg portion has a shape protruding in the axial direction ,
When a plane passing through the axis of the shaft and perpendicular to the installation plane is defined as a center plane, the first part, the second part, and the third part are defined as θ1, θ2, and θ3. Of the angles formed by the installation surface, the angle on the central surface side,
The rotating device according to claim 1, wherein the leg portion is provided so as to move away from the center plane as the position approaches the installation portion . In claim 1,
The casing has a main body part that forms the outer periphery of the casing, a ring-shaped bearing arrangement part provided with a bearing that supports the shaft and is provided radially inward from the main body part, and has a circumferential interval. A plurality of connecting portions that are provided apart from each other and connect the main body portion and the bearing arrangement portion,
The rotating device, wherein the bearing arrangement portion has a radial thickness of a portion to which the connecting portion is connected is smaller than a radial thickness of a portion to which the connecting portion is not connected. In claim 1 or 2,
The casing includes a first build-up portion provided with a refueling port of the rotating device, a second build-up portion provided with an oil gauge mounting portion, and a first build-up portion and the second build-up portion. And a third built-up portion provided therebetween. In any one of claims 1 to 3,
A rotating device, wherein an amount of the reinforcing rib protruding from the leg portion in the axial direction is larger as the position is closer to the installation portion, and smaller as the position approaches the peripheral portion of the shaft hole. In claim 4,
The axial protrusion amount of the reinforcing rib from the leg portion is 0 at the end of the first portion on the peripheral edge side of the shaft hole, and the end of the first portion on the peripheral edge side of the shaft hole is A rotating device that is flush with a peripheral portion of the shaft hole.

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