JP2011021659A - Eccentric reduction gear - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To shorten the length of the axial direction of a case and suppress a limitation by a processing machine of a case, in an eccentric reduction gear where lubricating oil in the case is sealed between the case and a motor flange. <P>SOLUTION: In the eccentric reduction gear, a first seal member 20 formed in a ring shape is arranged in a recess 34 for a first seal recessed so as to extend in the circumferential direction on an end surface 32 of an end 11a on the other end side of the case. The first seal member 20 is butted on and fixed to a plane perpendicular to the axial direction P of the case 11 in an end 12a on the flange one end side and a plane perpendicular to the axial direction P of the case 11 in an end 11a on the other end side of the case, thereby sealing the lubricating oil in the case 11. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  In the present invention, the swinging speed reduction mechanism is disposed inside the case, the motor flange to which the electric motor is attached is attached so as to cover the opening of the case, and the lubricating oil in the case is sealed between the case and the motor flange. The present invention relates to an eccentric type reduction gear.

  In various industrial machines and the like, an eccentric speed reducer equipped with a rocking speed reducing mechanism is used as a speed reducer capable of realizing a large reduction ratio. As such an eccentric type speed reducer, the one disclosed in Patent Document 1 is known. In the eccentric type speed reducer disclosed in Patent Document 1, the swing speed reduction mechanism is configured to include an external gear provided as a pinion (17, 18) and a crankshaft (37), and a cylindrical body (11 ) Is arranged inside the case provided. A motor flange provided as an upper cover (14) to which an electric motor is attached is attached to the case so as to cover the opening. An O-ring seal is disposed between the inner periphery of the end portion of the case and the end portion of the motor flange as a seal member that seals the lubricating oil in the case between the case and the motor flange.

  Moreover, in the eccentric type speed reducer disclosed in Patent Document 1, a base carrier that holds one end side and the other end side of the crankshaft rotatably, a carrier having an end carrier, and an output shaft include a base portion ( 22) and a carrier (20) having an end plate (23). The base carrier and the output shaft are provided as a base part (22), and the end carrier is provided as an end plate part (23). In the eccentric speed reducer disclosed in Patent Document 1, the swing speed reduction mechanism, the carrier, and the output shaft rotate with respect to the case via a pair of main bearings provided as a pair of bearings (21). It is held freely. One of the pair of main bearings is disposed between the outer periphery of the end carrier and the inner periphery of the case, and the main bearing and the O-ring seal are arranged along the axial direction of the case on the inner periphery of the case. They are arranged side by side.

Japanese Patent No. 4004256 (page 3-4, FIG. 1)

  In the eccentric type reduction gears, it is required to achieve a larger reduction ratio to improve the output torque and to reduce the size in the radial direction perpendicular to the axial direction (the direction of the rotational center line of the eccentric type reduction gears) ( There is also a tendency to reduce the diameter. For this reason, in the eccentric type reduction gear, in order to reduce the diameter of the case in which the swing reduction mechanism and the carrier are arranged on the inner side and secure a large reduction ratio, the axial direction of the case (the rotation center of the eccentric reduction gear) The length in the same direction as the line tends to be long. However, if the length of the case in the axial direction becomes long, processing machines with specifications that can form a case that is formed in a cylindrical shape and that has inner teeth arranged on the inner periphery are limited, making processing difficult. There is a risk of becoming. On the other hand, in the eccentric type speed reducer disclosed in Patent Document 1, the seal member that seals the lubricating oil in the case between the case and the motor flange includes the inner periphery of the end of the case and the end of the motor flange. It is arranged between. The seal member and one of the main bearings are arranged side by side along the axial direction of the case on the inner periphery of the case. For this reason, there exists a problem that a case becomes easy to become long in an axial direction, and is easy to receive the restriction | limiting of a processing machine.

In view of the above situation, the present invention can reduce the axial length of the case in the eccentric type reduction gear in which the lubricating oil in the case is sealed between the case and the motor flange. An object of the present invention is to provide an eccentric type speed reducer that can prevent the processing machine from being restricted.

  The eccentric type reduction gear according to the first invention for achieving the above object is provided with a case formed in a cylindrical shape and having inner teeth arranged on the inner periphery, and outer teeth meshing with the inner teeth on the outer periphery. A swing reduction mechanism disposed inside the case, and a base portion rotatably holding one end side of the crankshaft, the external gear having a crankshaft that rotates the external gear eccentrically A carrier, an end carrier that rotatably holds the other end side of the crankshaft, and a column that is disposed between the base carrier and the end carrier and connects the base carrier and the end carrier, A carrier disposed on the inside of the case, an output shaft fixed to the base carrier, to which a pinion is attached, and an input shaft to which driving force from the motor is input are disposed on the inside, and the motor is take A motor flange that is attached to the case so as to cover the opening of the case, and is disposed between the outer periphery of the end carrier and the inner periphery on the other end side of the case, A first main bearing that rotatably holds the carrier, and an outer periphery of the output shaft and an inner periphery on one end side of the case, and the output shaft is rotatably held with respect to the case. A second main bearing. The eccentric speed reducer according to the first aspect of the present invention includes an end surface of a flange one end side that is an end portion on one end side of the motor flange and a case other end side end that is an end portion on the other end side of the case. The first seal member further includes a first seal member formed in a ring shape and disposed in a recess for the first seal that is recessed so as to extend in the circumferential direction on at least one of the end surfaces. Is fixed in contact with a plane perpendicular to the axial direction of the case at one end of the flange and a plane perpendicular to the axial direction of the case at the other end of the case. The lubricating oil is sealed.

  According to this invention, the ring-shaped first seal member disposed in the first seal recess formed in at least one of the end surface of the flange one end side end and the case other end side end portion allows the case to The lubricating oil inside is sealed between the case and the motor flange. The first seal member is fixed in contact with each of the flange one end side end and the case other end side end in a plane perpendicular to the axial direction of the case. For this reason, in the flange one end side end and the case other end side end, it is possible to efficiently place and fix the first seal member by utilizing the regions where these end surfaces and the first seal recess are located. As a result, the first seal member that seals the lubricating oil in the case between the case and the motor flange is the same as the inner circumference of the end of the case and the motor as in the conventional eccentric type reduction gear disclosed in Patent Document 1. It is not arranged between the ends of the flange. Further, the first main bearing and the first seal member disposed between the outer periphery of the end carrier and the inner periphery of the case may be disposed side by side along the axial direction of the case on the inner periphery of the case. Absent. For this reason, it can suppress that a case becomes long in an axial direction, and can shorten the axial length of a case (it can shorten). Moreover, since a case can be shortened, it can suppress receiving the restriction | limiting of the processing machine of a case. As a result, even in the case of an eccentric type speed reducer with a larger reduction ratio set to improve the output torque and reduce the diameter, the case can be shortened. The case can be processed using the above processing machine.

  Therefore, according to the present invention, in the eccentric type reduction gear in which the lubricating oil in the case is sealed between the case and the motor flange, the length of the case in the axial direction can be shortened. It can suppress receiving a restriction.

An eccentric type speed reducer according to a second aspect of the invention is the eccentric type speed reducer according to the first aspect of the invention, wherein one of the outer peripheral side of the flange one end side end and the outer end side of the case other end side end has a peripheral side. A first fitting recess formed so as to extend in the direction and recessed in a stepped shape is provided between the outer peripheral side of the flange one end and the outer end of the other end of the case. The other of them is formed in a convex shape extending in the circumferential direction, and is provided with a first fitting convex portion that fits outside the first fitting concave portion. To do.

  According to this invention, on the outer peripheral side of the flange one end portion and the outer end side of the case other end portion, one is provided with the first fitting recess, and the other is fitted to the first fitting recess on the outside. A first fitting convex portion is provided. And when fixing and assembling a case and a motor flange, it positions at the fitting part of the 1st fitting recessed part and the 1st fitting convex part, and an assembly is performed easily. Further, the fitting portion between the case and the motor flange is not arranged on the inner peripheral side, but on the outer peripheral side, unlike the conventional eccentric type speed reducer disclosed in Patent Document 1, with respect to the case and the motor flange. Yes. For this reason, the fitting location of the case and the motor flange and the first main bearing are not arranged side by side along the axial direction of the case on the inner periphery of the case. Thereby, the axial length of the case can be further shortened.

  The eccentric speed reducer according to a third aspect of the invention is the eccentric speed reducer according to the second aspect of the invention, wherein the first fitting recess is provided on the outer peripheral side of the end of the other end of the case, and the first fitting protrusion. Is provided on the outer peripheral side of the end of one end of the flange.

  According to this invention, on the outer peripheral side of the case and the motor flange, the first fitting recess is provided at the other end of the case, and the first fitting protrusion is provided at the flange one end. For this reason, in the fitting part of a case and a motor flange, since a recessed part is provided in the case side, compared with the case where the 1st fitting convex part is provided in the case side and the 1st fitting concave part is provided in the motor flange side. In addition, the axial length of the case can be further shortened.

  The eccentric type speed reducer according to a fourth aspect of the invention is the eccentric type speed reducer according to the first aspect of the invention, wherein the outer circumference of the outer ring of the first main bearing is in contact with the inner circumference of the end portion on the other end side of the case and one end of the flange. It arrange | positions so that it may contact | abut also to the inner periphery of a side edge part.

  According to the present invention, the first main bearing is arranged such that the outer periphery of the outer ring abuts the inner periphery of the end portion on the other end side of the case. When fixing and assembling the case and the motor flange, one end of the flange with respect to the region partitioned to be recessed over the end surface of the other end of the case and the outer periphery of the outer ring of the first main bearing. Positioning is performed so that the inner peripheral sides of the end portions fit together, and assembly is easily performed. For this reason, the fitting part of a case and a motor flange will be comprised by utilizing effectively the outer periphery of the outer ring | wheel of the 1st main bearing which contact | abuts also to the inner periphery of the flange one end part. Thereby, like the conventional eccentric type speed reducer disclosed in Patent Document 1, the fitting location of the case and the motor flange and the first main bearing are separately independent along the axial direction of the case on the inner periphery of the case. It will not be arranged side by side. For this reason, the outer periphery of the outer ring of the first main bearing can be effectively utilized as a part of the fitting portion of the case and the motor flange, and the axial length of the case can be further shortened.

An eccentric speed reducer according to a fifth aspect of the invention is the eccentric speed reducer according to any one of the first to fourth aspects of the invention, wherein the eccentric speed reducer is attached to the outer periphery of the output shaft and supports one end side of the second main bearing. A member, a second seal member that abuts against the outer periphery of the bearing holding member and seals the lubricating oil in the case, and is attached to a case one end of the case that is one end of the case , At least one of a seal housing that holds the second seal member, an end surface of the case one end side end, and an end surface of the housing other end side that is an end portion on the other end side of the seal housing. And a third seal member that is formed in a ring shape and that is disposed in a second seal recess that is recessed so as to extend in the circumferential direction. Part And abutting against a plane perpendicular to the axial direction of the case and a plane perpendicular to the axial direction of the case at the other end of the housing to seal the lubricating oil in the case. Features.

  According to the present invention, the case is provided by the ring-shaped third seal member disposed in the second seal recess formed in at least one of the end surface of the case one end side end and the end surface of the housing other end side. The lubricating oil inside is sealed between the case and the seal housing. The third seal member is fixed in contact with each of the case one end portion and the housing other end portion on a plane perpendicular to the axial direction of the case. For this reason, in the case one end side end and the housing other end side end, it is possible to arrange and fix the third seal member by efficiently utilizing the region where these end surfaces and the second seal recess are located. Accordingly, the third seal member that seals the lubricating oil in the case between the case and the seal housing is not disposed between the inner periphery of the end portion of the case and the end portion of the seal housing. And the 2nd main bearing and the 3rd seal member which are arranged between the outer periphery of the output shaft and the inner periphery of the case are not arranged side by side along the axial direction of the case on the inner periphery of the case. . For this reason, it can further suppress that a case becomes long in an axial direction, and can further shorten the length of the case in the axial direction.

  An eccentric type speed reducer according to a sixth aspect of the present invention is the eccentric type speed reducer according to the fifth aspect of the present invention, wherein one of the outer peripheral side of the case one end side end and the outer end side of the housing other end side end has a peripheral side. A second fitting recess formed to extend in the direction and formed in a stepped shape is provided between the outer peripheral side of the one end of the case and the outer peripheral side of the end of the other end of the housing. The other of them is formed in a convex shape extending in the circumferential direction, and is provided with a second fitting convex portion that fits outside the second fitting concave portion. To do.

  According to this invention, on the outer peripheral side of the case one end side end and the outer end side of the other end of the housing, one is provided with the second fitting recess, and the other is fitted to the second fitting recess on the outside. A second fitting convex portion is provided. And when fixing and assembling a case and a seal housing, it positions at the fitting part of the 2nd fitting recessed part and the 2nd fitting convex part, and an assembly is performed easily. Moreover, the fitting part of a case and a seal housing is arrange | positioned with respect to a case and a seal housing not on the inner peripheral side but on the outer peripheral side. For this reason, the fitting location of the case and the seal housing and the second main bearing are not arranged side by side along the axial direction of the case on the inner periphery of the case. Thereby, the axial length of the case can be further shortened.

  The eccentric speed reducer according to a seventh aspect of the invention is the eccentric speed reducer according to the sixth aspect of the invention, wherein the second fitting recess is provided on the outer peripheral side of the case one end side, and the second fitting convex is It is provided in the outer peripheral side of the said housing other end side edge part.

  According to the present invention, on the outer peripheral side of the case and the seal housing, the second fitting recess is provided at the one end of the case, and the second fitting protrusion is provided at the other end of the housing. For this reason, in the fitting part of a case and a seal housing, since a recessed part is provided in the case side, compared with the case where the 2nd fitting convex part is provided in the case side, and the 2nd fitting recessed part is provided in the seal housing side. In addition, the axial length of the case can be further shortened.

  According to the present invention, in the eccentric type speed reducer in which the lubricating oil in the case is sealed between the case and the motor flange, the length of the case in the axial direction can be shortened, which limits the processing machine of the case. It can suppress receiving.

It is a front view which shows the eccentric type reduction gear which concerns on 1st Embodiment of this invention, and is a figure containing a partially notched cross section. It is sectional drawing which expanded a part in FIG. 1, Comprising: It is an expanded sectional view which shows a 1st sealing member and the part of the vicinity. It is sectional drawing which expanded a part in FIG. 1, Comprising: It is an expanded sectional view which shows a 2nd sealing member and a 3rd sealing member, and the part of the vicinity. It is a front view which shows the eccentric type reduction gear which concerns on a prior art, and is a figure containing a notch cross section. FIG. 5 is a view showing an enlarged cross-sectional view corresponding to FIG. 2 and a cross-sectional view in which a part of FIG. FIG. 5 is a diagram showing an enlarged cross-sectional view corresponding to FIG. 3 and a cross-sectional view in which a part of FIG. It is a front view which shows the eccentric type reduction gear which concerns on 2nd Embodiment of this invention, and is a figure containing a partially notched cross section. FIG. 8 is an enlarged cross-sectional view of a part of FIG. 7, showing the first seal member and a portion in the vicinity thereof. It is sectional drawing which expands and shows a part of cross section of the eccentric reduction gear which concerns on a modification, Comprising: It is an expanded sectional view which shows a 3rd seal member and the part of the vicinity.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. The eccentric speed reducer according to the embodiment of the present invention can be widely applied to various industrial machines such as wind turbines, construction machines, industrial robots, various machine tools, various vehicles, and the like. For example, in a windmill, since the diameter of a blade (blade) tends to increase in recent years, a yaw driving device for turning the nacelle of the windmill according to the wind direction and a pitch angle of the blade are controlled. As a pitch drive device, there is a demand for a reduction gear with high output specifications while suppressing an increase in radial dimension. For this reason, the eccentric type reduction gear according to the present embodiment is preferably used as a windmill yaw driving device or a windmill pitch driving device. Further, the eccentric speed reducer according to the present embodiment is not limited to this example, the swing speed reduction mechanism is disposed inside the case, and the motor flange to which the electric motor is attached is attached so as to cover the opening of the case. The present invention can be widely applied to an eccentric speed reducer in which the internal lubricating oil is sealed between the case and the motor flange.

(First embodiment)
FIG. 1 is a front view showing an eccentric type reduction gear 1 according to a first embodiment of the present invention, and includes a partially cutaway cross section. The eccentric speed reducer 1 is used, for example, as a windmill yaw drive device for turning a nacelle of a windmill, and decelerates rotation input from an electric motor 100 (only part of which is shown in FIG. 1). Transmit and output. The eccentric speed reducer 1 includes a case 11, a motor flange 12, an input shaft 13, a swing speed reduction mechanism 14, a carrier 15, an output shaft 16, a first main bearing 17, a second main bearing 18, a seal housing 19, 1 seal member 20, the 2nd seal member 21, the 3rd seal member 22, the bearing holding member 23, etc. are comprised.

As shown in FIG. 1, the eccentric speed reducer 1 has a pinion 101 attached to an output shaft 16 positioned so as to protrude from the case 11 on one end side disposed on the lower side, and the other end side disposed on the upper side. The motor 100 is attached to the motor flange 12. In FIG. 1, the pinion 101 is schematically shown. And in the eccentric type reduction gear 1, the rotational drive force input from the electric motor 100 arrange | positioned at the upper side is shown with the input shaft 13 (shown with a broken line in the figure) arrange | positioned inside the motor flange 12, and a planetary gear mechanism (FIG. (Not shown), the signal is transmitted via the swinging speed reduction mechanism 14 and the carrier 15 arranged inside the case 11 and output to the pinion 101 attached to the output shaft 16. When the eccentric speed reducer 1 is used as a windmill yaw drive device, the eccentric speed reducer 1 is arranged so that the pinion 101 meshes with a gear fixed to the upper part of the tower of the windmill. And the eccentric type reduction gear 1 act | operates with the driving force from the electric motor 100, and the pinion 101 rotates, and the nacelle of a windmill rotates. In the following description, in the eccentric type reduction gear 1, the lower output side where the output shaft 16 is disposed is one end side, and the upper input side where the electric motor 100 is disposed is the other end side. This will be described (the same applies to the description of the second embodiment).

  As shown in FIG. 1, the case 11 is formed in a cylindrical shape with both ends open, the output shaft 16 projects from the opening on one end side, and the opening on the other end side is covered with the motor flange 12. ing. The case 11 has a plurality of pin inner teeth 24 arranged on the inner periphery, and a swing speed reduction mechanism 14 and the like arranged inside. Further, the swing reduction mechanism 14, the carrier 15, and the output shaft 16 are arranged in the axial direction of the case 11 that is the same direction as the rotation center line P (shown by a one-dot chain line in FIG. 1) of the eccentric speed reducer 1. Hereinafter, it is also arranged along “the axial direction P of the case 11”. The inside of the case 11 is sealed to the outside by first to third sealing members (20, 21, 22), which will be described later, and the inside of the sealed case 11 is filled with lubricating oil. Yes.

  Also, a plurality of pin internal teeth (internal teeth in the present embodiment) 24 are provided, and are arranged on the inner periphery of the case 11 in a state of being fitted in and attached to a pin groove formed on the inner periphery of the case 11. ing. The pin internal teeth 24 are formed as pin-shaped members (round bar-shaped members), and are arranged so that the longitudinal direction thereof is parallel to the axial direction P of the case 11, and in the circumferential direction on the inner periphery of the case 11. Are arranged at equal intervals along the outer circumference of the gear and are configured to mesh with external teeth of an external gear of a swing reduction mechanism 14 described later.

  The input shaft 13 is connected to an output shaft (not shown) of the electric motor 100, is provided as a shaft-like member to which driving force from the electric motor 100 is input to the other end side, and is disposed on the rotation center line P. Has been. A planetary gear mechanism (not shown) is connected to one end side of the input shaft 13. The planetary gear mechanism is further connected to the input gear 27 on the output side.

  The motor flange 12 is formed as a lid-like member that covers the opening on the other end side of the case 11, and is provided as a cylindrical body that has an outer shape that expands in a stepped shape toward the one end side. It has been. An input shaft 13 is disposed inside the motor flange 12. Further, a flange one end portion 12 a that is an end portion on one end side of the motor flange 12 is fixed to a case other end portion 11 a that is an end portion on the other end side of the case 11 by a bolt 31. Thus, the motor flange 12 is attached to the case 11 so as to cover the opening on the other end side of the case 11. On the other hand, the electric motor 100 is attached to the other end side of the motor flange 12.

The swing reduction mechanism 14 includes a crankshaft 25, an external gear, and the like. In FIG. 1, except for a part on the other end side of the crankshaft 25 (that is, about the majority of the crankshaft 25 and the external gear), it is indicated by a dashed diagonal line, and detailed illustration is omitted. . The planetary gear mechanism (not shown), the input gear 27, and the spur gear 26 are provided between the crankshaft 25 and the input shaft 13 of the swing speed reduction mechanism 14. The driving force from the electric motor 100 is transmitted via the input shaft 13, the planetary gear mechanism, the input gear 27, and the spur gear 26. The input gear 27 is provided as a shaft-shaped gear member and is disposed on the rotation center line P. A gear portion that meshes with the spur gear 26 is formed on one end side of the input gear 27, whereby the input gear 27 decelerates and transmits the driving force from the electric motor 100 transmitted through the planetary gear mechanism to the spur gear 26. Is configured to input. A plurality of (for example, three) spur gears 26 are arranged around the input gear 27 so as to mesh with the gear portion of the input gear 27, and the radial direction of the eccentric speed reducer 1 with respect to the input gear 27 ( (A direction perpendicular to the rotation center line P). The spur gear 26 is formed with a through hole at the center, and is fixed to the end of the crankshaft 25 on the other end side by spline coupling.

  A plurality of (for example, three) crankshafts 25 of the oscillating speed reduction mechanism 14 are arranged at equal angular positions along the circumferential direction with the rotation center line P as the center. They are arranged in parallel. Each crankshaft 25 is disposed so as to penetrate a crank hole (not shown) formed in the external gear, and is provided as a shaft member that rotates and rotates the external gear eccentrically. ing. And the crankshaft 25 will perform a revolution operation | movement with rotation of the external gear accompanying self rotation (autorotation). The crankshaft 25 is provided with a plurality of (for example, two) eccentric portions arranged in series, like the crankshaft disclosed in Patent Document 1. Each eccentric portion is formed such that a cross section perpendicular to the axial direction is a circular cross section, and each center position is provided to be eccentric with respect to the rotation center line of the crankshaft 25. Further, one end side and the other end side of the crankshaft 25 are respectively held rotatably with respect to the carrier 15 via crankshaft bearings. In addition, although illustration of a crankshaft bearing is abbreviate | omitted in FIG. 1, the crankshaft bearing is provided as a tapered roller bearing, for example.

  The external gear of the swing reduction mechanism 14 is configured in the same manner as the external gear disclosed in Patent Document 1. A plurality of (for example, two) external gears are provided and housed in the case 11 in a state of being arranged in parallel. In the external gear, a crank hole through which each crankshaft 25 passes through a bearing and a post through hole through which each post 30 described later passes in a loosely fitted state are alternately arranged along the circumferential direction of the external gear. A plurality are formed. In addition, external teeth that mesh with the pin internal teeth 24 are provided on the outer circumferences of the external gears. The number of external teeth of the external gear is provided to be one or more than the number of teeth of the pin internal teeth 24. For this reason, when the crankshaft 25 rotates, the meshing between the meshing external teeth and the pin internal teeth 24 shifts, and the external gear is eccentrically rotated.

  The carrier 15 is disposed inside the case 11 and includes a base carrier 28, an end carrier 29, and a support 30. The base carrier 28 has the output shaft 16 integrally formed at one end side thereof and disposed in the case 11 (the output shaft 16 is integrally formed and fixed to the base carrier 28). The base carrier 28 is formed with a plurality of crank holding holes 28a along the circumferential direction on the other end side. The crank holding holes 28a rotatably hold one end side of each crankshaft 25 via a crankshaft bearing. Yes. The end carrier 29 is connected to the base carrier 28 via the support column 30 and is provided as a disk-shaped member. A plurality of crank through holes 29a are formed in the end carrier 29 along the circumferential direction as through holes in which the other end side of the crankshaft 25 is disposed. In the crank through hole 29a, the other end side of the crankshaft 25 is rotatably held via a crankshaft bearing.

  The support column 30 is provided as a columnar portion disposed between the base carrier 28 and the end carrier 29, and the base carrier 28 and the end carrier 29 are connected by the support column 30. A plurality of (for example, three) pillars 30 are arranged along the circumferential direction around the rotation center line P, and are arranged so that their axial directions are parallel to the rotation center line P. Further, the support columns 30 and the crankshaft 25 are alternately arranged along the circumferential direction around the rotation center line P. Each support column 30 is formed integrally with the base carrier 28 and is provided so as to protrude on the other end side of the base carrier 28. The base carrier 28 and the end carrier 29 are coupled to each other via a support 30 and a bolt (not shown) inserted into the support 30.

The first main bearing 17 is disposed between the outer periphery of the end carrier 29 and the inner periphery on the other end side of the case 11, and is configured to hold the carrier 15 rotatably with respect to the case 11. The first main bearing 17 is provided as a ball bearing in which the outer ring is fitted on the inner circumference on the other end side of the case 11 and the inner ring is fitted on the outer circumference of the end carrier 29. The first main bearing 17 has a position on one end side defined by the outer ring engaging with a step formed on the inner periphery on the other end side of the case 11, and the position on the other end side is the end position. It is defined by the inner ring engaging with the edge formed on the other end side of the outer periphery of the part carrier 29.

  The second main bearing 18 is disposed between the outer periphery of the output shaft 16 and the inner periphery on one end side of the case 11, and is configured to hold the output shaft 16 rotatably with respect to the case 11. The second main bearing 18 is provided as a tapered roller bearing in which the outer ring is fitted on the inner circumference on one end side of the case 11 and the inner ring is fitted on the outer circumference of the output shaft 16. In addition, a bearing holding member 23 formed in a ring shape is disposed on one end side of the second main bearing 18. The bearing holding member 23 is attached to the outer periphery of the output shaft 16 and is configured to support one end side of the second main bearing 18. The bearing holding member 23 is attached to the output shaft 16 by screwing, for example. The position of one end side of the second main bearing 18 is defined by contacting the end portion on the other end side of the bearing holding member 23, and the position on the other end side is the inner circumference on one end side of the case 11. It is defined by the outer ring engaging with the step portion formed in.

  Next, the first to third seal members (20, 21, 22) and the configuration in the vicinity of the location where these seal members (20-22) are arranged in the eccentric type reduction gear 1 will be described in detail. . FIG. 2 is an enlarged cross-sectional view showing a part of FIG. 1 and showing the first seal member 20 and the vicinity thereof.

  As shown well in FIG. 2, the case other end 11 a and the flange one end 12 a are connected by a bolt 31. And the end surface 32 of the case other end side end portion 11a and the end surface 33 of the flange one end side end portion 12a are disposed so as to face each other. The end surface 32 and the end surface 33 are both formed as a plane perpendicular to the axial direction P of the case 11. Moreover, the end surface 32 of the case other end 11a is formed with a first seal recess 34 that is recessed so as to extend in the circumferential direction. The first sealing recess 34 is annularly arranged on the end surface 32 and is formed as a groove-like portion having a rectangular cross section in a cross section perpendicular to the circumferential direction. The bottom surface of the first seal recess 34 as a groove-like portion is formed as a plane perpendicular to the axial direction P of the case 11.

  Moreover, the edge part of the outer peripheral side of the case other end 11a is provided with a first fitting recess 35 that is formed so as to extend in the circumferential direction and is stepped. And the 1st fitting convex part 36 which fits the outer side with respect to the 1st fitting recessed part 35 while being formed in the convex shape extended over the circumferential direction in the outer peripheral side of the flange one end part 12a. Is provided. In this manner, the case other end 11a and the flange one end 12a are guided to each other on the outer peripheral side in the first fitting recess 35 and the first fitting protrusion 36 arranged in an annular shape. It is configured to fit together.

  The first seal member 20 is provided as an O-ring seal member having a substantially circular cross section or a substantially oval cross section formed in a ring shape, and is arranged in a state of being fitted in the first seal recess 34. That is, the first seal member 20 is provided so that the diameter dimension thereof corresponds to the diameter dimension of the first seal recess 34. The first seal member 20 includes a plane (end surface 33 in the present embodiment) perpendicular to the axial direction P of the case 11 at the flange one end portion 12a and an axial direction P of the case 11 at the case other end portion 11a. It is fixed in contact with a flat surface (in this embodiment, the bottom surface of the first seal recess 34). Thereby, the lubricating oil in the case 11 is sealed in the case 11 between the case 11 and the motor flange 12.

  FIG. 3 is an enlarged cross-sectional view of a part of FIG. 1, showing the second seal member 21 and the third seal member 22 and the vicinity thereof. As shown in FIGS. 1 and 3, the second seal member 21 is formed in a ring shape, and the lip portion provided on the inner periphery thereof abuts against the outer periphery of the bearing holding member 23 to lubricate the case 11. The oil is sealed in the case 11. The seal housing 19 is formed as a ring-shaped member, and is attached to the case one end 11b, which is an end on one end of the case 11, and is configured to hold the second seal member 21. . The second seal member 21 is held by the seal housing 19 in a state where the outer periphery thereof is in close contact with the inner periphery of the seal housing 19.

  The seal housing 19 and the case one end side end portion 11 b are coupled by a bolt 37. And the end surface 38 of the housing other end side end portion 19a, which is the end portion on the other end side of the seal housing 19, and the end surface 39 of the case one end side end portion 11b are arranged in contact with each other. The end surface 38 and the end surface 39 are both formed as a plane perpendicular to the axial direction P of the case 11. Further, the end surface 39 of the case one end 11b is formed with a second seal recess 40 that is recessed so as to extend in the circumferential direction. The second sealing recess 40 is annularly arranged on the end surface 39 and is formed as a groove-like portion having a rectangular cross section in a cross section perpendicular to the circumferential direction. Then, the bottom surface (shown in FIG. 3 as being disposed on the upper side of the rectangular cross section) of the second seal recess 40 is formed as a plane perpendicular to the axial direction P of the case 11. ing.

  In addition, a second fitting recess 41 is provided at the outer peripheral edge of the case one end 11b. The second fitting recess 41 is formed so as to extend in the circumferential direction and has a stepped recess. And the 2nd fitting convex part which fits in the outer side with respect to the 2nd fitting recessed part 41 while it is formed in the convex shape extended over the circumferential direction in the outer peripheral side of the housing other end side edge part 19a. 42 is provided. As described above, the case one end side end portion 11b and the housing other end side end portion 19a are guided to each other on the outer peripheral side in the second fitting concave portion 41 and the second fitting convex portion 42 arranged in an annular shape. It is configured to fit together.

  The third seal member 22 is provided as an O-ring seal member having a substantially circular cross section or a substantially oval cross section formed in a ring shape, and is arranged in a state of being fitted into the third seal recess 40. That is, the third seal member 22 is provided so that the diameter dimension thereof corresponds to the diameter dimension of the second seal recess 40. The third seal member 22 has a plane perpendicular to the axial direction P of the case 11 at the case one end portion 11b (in this embodiment, the bottom surface of the second seal recess 40) and a housing other end portion 19a. The case 11 is fixed in contact with a plane (end face 38 in the present embodiment) perpendicular to the axial direction P of the case 11. Thereby, the lubricating oil in the case 11 is sealed in the case 11 between the case 11 and the seal housing 19.

Next, the operation of the above-described eccentric speed reducer 1 will be described. The eccentric speed reducer 1 operates when the electric motor 100 is operated. When the operation of the electric motor 100 is started, the input gear 27 driven via the input shaft 13 and a planetary gear mechanism (not shown) rotates. When the input gear 27 rotates, each spur gear 26 that meshes with the input gear 27 rotates, and each crankshaft 25 to which each spur gear 26 is fixed rotates. Along with this rotation, a load acts on the external gear from the eccentric portion of the crankshaft 25, and the external gear rotates eccentrically so as to swing while shifting its mesh with the pin internal teeth 24. Then, with the eccentric rotation of the external gear, the crankshaft 25 rotated and held with respect to the external gear performs a revolving operation around the rotation center line P while rotating. By the revolving operation of the crankshaft 25, the output shaft 16 rotates together with the carrier 15 that rotatably holds the crankshaft 25, and a large torque is output from the pinion 101. The lubricating oil in the case 11 is sealed by the first seal member 20, the second seal member 21, the third seal member 22, and the like.

  Here, the eccentric speed reducer 1 is compared with the eccentric speed reducer according to the prior art, and the difference in the length of the case 11 in the axial direction P will be described. FIG. 4 is a front view showing an eccentric type speed reducer 110 according to the prior art, including a partially cutaway cross section. In the eccentric type reduction gear 110 shown in FIG. 4, from the viewpoint of making the correspondence with the eccentric type reduction gear 1 easy to understand, for the convenience of explanation, components other than the seal member 111 and the seal member 112 are described as the eccentric type reduction gear. The same reference numerals as those in FIG. The seal member 111 of the eccentric speed reducer 110 shown in FIG. 4 seals the lubricating oil in the case 11 in the case 11 between the flange one end portion 12a and the case other end portion 11a. Yes. The seal member 112 seals the lubricating oil in the case 11 between the case one end 11b and the housing other end 19a.

  5 is an enlarged cross-sectional view corresponding to FIG. 2 (FIG. 5A), and an enlarged cross-sectional view of a part of FIG. 4, showing an enlarged cross-sectional view showing the seal member 111 and the vicinity thereof (FIG. 5). It is a figure which compares and shows (b)). As shown in FIG. 5A, in the eccentric type reduction gear 1 of the present embodiment, the first seal member 20 is arranged in the axial direction P of the case 11 at the case other end side end portion 11a and the flange one end side end portion 12a. Each is fixed in contact with a vertical plane. The case other end 11a and the flange one end 12a are configured so as to be guided and fitted to each other on the outer peripheral side by the first fitting recess 35 and the first fitting protrusion 36. ing.

  On the other hand, in the eccentric type reduction gear 110 according to the prior art, as shown in FIG. 5B, the seal member 111 is disposed between the inner periphery of the case other end 11a and the flange one end 12a. Has been. That is, the sealing member 111 is fixed in contact with the cylindrical surface parallel to the axial direction P of the case 11 at the case other end 11a and the flange one end 12a. Further, the case other end 11a and the flange one end 12a are configured to be guided and fitted to each other on the inner peripheral side where the first main bearing 17 is disposed.

  Therefore, as shown in FIGS. 5A and 5B, when the eccentric type reduction gear 1 and the eccentric type reduction gear 110 are compared, the end surface 17a on one end side of the outer ring of the first main bearing 17 and the other end side of the case. At the distance from the end surface 32 of the end portion 11a, as shown by the double-ended arrows in the figure, a difference in the length dimension L1 occurs. That is, the case 11 of the eccentric speed reducer 1 is such that the length in the axial direction P of the case 11 is shorter by the length dimension L1 on the other end side of the case 11 than the case 11 of the eccentric speed reducer 110. It is configured.

  6 is an enlarged cross-sectional view corresponding to FIG. 3 (FIG. 6A), and an enlarged cross-sectional view of a part of FIG. 4, showing an enlarged cross-sectional view showing the seal member 112 and the vicinity thereof (FIG. 6). It is a figure which compares and shows (b)). As shown in FIG. 6A, in the eccentric speed reducer 1 of the present embodiment, the third seal member 22 is arranged in the axial direction P of the case 11 at the case one end 11b and the housing other end 19a. Each is fixed in contact with a vertical plane. The case one end 11b and the other housing end 19a are configured to be guided and fitted to each other on the outer peripheral side by the second fitting recess 41 and the second fitting projection 42. ing.

  On the other hand, in the eccentric type reduction gear 110 according to the prior art, as shown in FIG. 6B, the seal member 112 is disposed between the inner periphery of the case one end 11b and the housing other end 19a. Has been. That is, the seal member 112 is fixed in contact with the cylindrical surface parallel to the axial direction P of the case 11 at the case one end 11b and the housing other end 19a. Further, the case one end 11b and the other housing end 19a are configured to be guided and fitted to each other on the inner peripheral side where the second main bearing 18 is disposed.

  Therefore, as shown in FIGS. 6A and 6B, when the eccentric type reduction gear 1 and the eccentric type reduction gear 110 are compared, the end surface 18a on the other end side of the outer ring of the second main bearing 18 and one end side of the case. At the distance from the end surface 39 of the end portion 11b, a difference in the length dimension L2 occurs as shown by the double-ended arrows in the drawing. That is, the case 11 of the eccentric speed reducer 1 is such that the length in the axial direction P of the case 11 is shorter by the length dimension L2 at one end side of the case 11 than the case 11 of the eccentric speed reducer 110. It is configured. Therefore, when the difference in length dimension at one end side of the case 11 is also combined, the case 11 of the eccentric speed reducer 1 has a total length in the axial direction P of the case 11 with respect to the case 11 of the eccentric speed reducer 110. In this configuration, the length is shortened by the length (L1 + L2).

  According to the eccentric type reduction gear 1 described above, lubrication in the case 11 is achieved by the ring-shaped first seal member 20 disposed in the first seal recess 34 formed in the end surface 32 of the case other end 11a. Oil is sealed between the case 11 and the motor flange 12. The first seal member 20 is fixed in contact with each of the flange one end portion 12a and the case other end portion 11a on a plane perpendicular to the axial direction P of the case 11. For this reason, in the flange one end side end portion 12a and the case other end side end portion 11a, the first seal member 20 is used by efficiently utilizing the regions where the end faces (32, 33) and the first seal recess 34 are located. Can be placed and fixed. Accordingly, the first seal member 20 that seals the lubricating oil in the case 11 between the case 11 and the motor flange 12 is disposed between the inner periphery of the end portion of the case 11 and the end portion of the motor flange 12. It will not be done. The first main bearing 17 and the first seal member 20 arranged between the outer periphery of the end carrier 29 and the inner periphery of the case 11 are aligned along the axial direction P of the case 11 on the inner periphery of the case 11. It will not be arranged in. For this reason, it can suppress that case 11 becomes long in an axial direction, and the length in the axial direction P of case 11 can be shortened (it can shorten). Moreover, since the case 11 can be shortened, it is possible to prevent the case 11 from being restricted by the processing machine. As a result, in the eccentric type reduction gear 1, even when a larger reduction ratio is set and the output torque is improved and the diameter is reduced, the shaft can be shortened. The case 11 can be processed using a processing machine.

  Therefore, according to this embodiment, in the eccentric type reduction gear 1 in which the lubricating oil in the case 11 is sealed between the case 11 and the motor flange 12, the length of the case 11 in the axial direction P can be shortened. It is possible to prevent the case 11 from being restricted by the processing machine.

  Further, according to the eccentric speed reducer 1, the first fitting recess 35 is provided on one side on the outer peripheral side of the flange one end portion 12a and the outer end side of the case other end portion 11a, and the first fitting is provided on the other end. A first fitting convex portion 36 that is fitted to the joint concave portion 35 on the outside is provided. Then, when the case 11 and the motor flange 12 are fixed and assembled, the case 11 and the first fitting convex portion 36 are positioned at the fitting position, and the assembly is easily performed. Further, the fitting portion between the case 11 and the motor flange 12 is not disposed on the inner peripheral side with respect to the case 11 and the motor flange 12 but is disposed on the outer peripheral side. For this reason, the fitting part of the case 11 and the motor flange 12 and the first main bearing 17 are not arranged side by side along the axial direction P of the case 11 on the inner periphery of the case 11. Thereby, the length in the axial direction P of the case 11 can be further shortened. And in the eccentric type reduction gear 1, the 1st fitting recessed part 35 is provided in the case other end side edge part 11a, and the 1st fitting convex part 36 is provided in the flange one end side edge part 12a. For this reason, since the recessed part is provided in the case 11 side in the fitting part of the case 11 and the motor flange 12, the 1st fitting convex part 36 is the case 11 side, and the 1st fitting recessed part 35 is the motor flange 12 side. The length of the case 11 in the axial direction P can be further reduced as compared with the case where the case 11 is provided.

  Further, according to the eccentric type speed reducer 1, the lubricating oil in the case 11 is caused by the ring-shaped third seal member 22 disposed in the second seal recess 40 formed on the end surface 39 of the case one end 11b. Sealing is performed between the case 11 and the seal housing 19. The third seal member 22 is fixed in contact with each of the case one end 11b and the housing other end 19a on a plane perpendicular to the axial direction P of the case 11. For this reason, in the case one end side end portion 11b and the housing other end side end portion 19a, the region where the end surfaces (38, 39) and the second seal concave portion 40 are located is efficiently utilized to use the third seal member 22. Can be placed and fixed. Accordingly, the third seal member 22 that seals the lubricating oil in the case 11 between the case 11 and the seal housing 19 is disposed between the inner periphery of the end portion of the case 11 and the end portion of the seal housing 19. It will not be done. The second main bearing 18 and the third seal member 22 disposed between the outer periphery of the output shaft 16 and the inner periphery of the case 11 are aligned along the axial direction P of the case 11 on the inner periphery of the case 11. It will not be placed. For this reason, it can further suppress that case 11 becomes long in the axial direction, and the length in the axial direction P of case 11 can be further shortened.

  Further, according to the eccentric type speed reducer 1, the second fitting recess 41 is provided on one side and the second fitting on the other side on the outer peripheral side of the case one end 11b and the housing other end 19a. A second fitting convex portion 42 is provided to be fitted to the joint concave portion 41 on the outside. Then, when the case 11 and the seal housing 19 are fixed and assembled, the case 11 and the second fitting convex portion 42 are positioned at the fitting position, and the assembly is easily performed. In addition, the fitting part between the case 11 and the seal housing 19 is arranged on the outer peripheral side rather than the inner peripheral side with respect to the case 11 and the seal housing 19. For this reason, the fitting part of the case 11 and the seal housing 19 and the second main bearing 18 are not arranged side by side along the axial direction P of the case 11 on the inner periphery of the case 11. Thereby, the length in the axial direction P of the case 11 can be further shortened. And in the eccentric type reduction gear 1, the 2nd fitting recessed part 41 is provided in the case one end side edge part 11b, and the 2nd fitting convex part 42 is provided in the housing other end side edge part 19a. For this reason, since the recessed part is provided in the case 11 side in the fitting part of case 11 and the seal housing 19, the 2nd fitting convex part 42 is the case 11 side, and the 2nd fitting recessed part 41 is the seal housing 19 side. The length of the case 11 in the axial direction P can be further reduced as compared with the case where the case 11 is provided.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. FIG. 7 is a front view showing the eccentric speed reducer 2 according to the second embodiment, and includes a partially cutaway cross section. The eccentric speed reducer 2 is used as, for example, a windmill yaw drive device, and decelerates, transmits, and outputs the rotation input from the electric motor 100 (only a part is shown in FIG. 2) disposed on the upper side. The eccentric speed reducer 2 includes the case 11, the motor flange 12, the input shaft 13, the swing speed reduction mechanism 14, the carrier 15, the output shaft 16, the first main body, like the eccentric speed reducer 1 of the first embodiment. The bearing 17, the second main bearing 18, the seal housing 19, the first seal member 20, the second seal member 21, the third seal member 22, the bearing holding member 23, and the like are configured. 7, illustration of the case 11 and one end side of the output shaft 16 is omitted, and illustration of the second main bearing 18, the second seal member 21, the third seal member 22, and the like is also omitted. However, the eccentric speed reducer 2 differs from the first embodiment in a part of the configuration of the case other end side end portion 11a and the flange one end side end portion 12a. Hereinafter, the same reference numerals in the drawings denote the same components as those in the first embodiment, and a description thereof will be omitted. The configurations of the case other end side end portion 11a and the flange one end side end portion 12a are different from those in the first embodiment. The location will be described.

FIG. 8 is an enlarged cross-sectional view of a part of FIG. 7, showing the first seal member 20 and the vicinity thereof. As shown in FIG. 2, in the eccentric type reduction gear 2, as in the eccentric type reduction gear 1, the first seal member 20 is a plane (end surface) perpendicular to the axial direction P of the case 11 at the flange one end portion 12 a. 33) and a plane perpendicular to the axial direction P of the case 11 at the other end 11a of the case (the bottom surface of the first seal recess 34). However, in the eccentric speed reducer 2, the first fitting recess 35 and the first fitting protrusion 36 are not provided, and the case other end 11a and the flange one end 12a are on the outer peripheral side. They are not configured to be guided and fitted together. And the 1st main bearing 17 is arrange | positioned so that the outer periphery 17b of the outer ring may contact | abut to the inner periphery of the case other end side edge part 11a, and to the inner periphery of the flange one end side edge part 12a. For this reason, in the eccentric type speed reducer 2, the flange one end portion 12a is guided on the inner peripheral side with respect to the outer periphery 17b of the outer ring of the first main bearing 17 and the end surface 32 of the case other end portion 11a. It is comprised so that it may fit.

  According to the eccentric type reduction gear 2 described above, as in the eccentric type reduction gear 1 of the first embodiment, the first seal member 20 is in the axial direction of the case 11 at the flange one end portion 12a and the case other end portion 11a. It is fixed in contact with each plane perpendicular to P. For this reason, in the eccentric type reduction gear 2 in which the lubricating oil in the case 11 is sealed between the case 11 and the motor flange 12, the length of the case 11 in the axial direction P can be shortened. It can suppress receiving the restriction | limiting of a processing machine.

  Moreover, according to the eccentric type reduction gear 2, the 1st main bearing 17 is arrange | positioned so that the outer periphery 17b of an outer ring may contact | abut the inner periphery of the case other end side edge part 11a. And when fixing and assembling the case 11 and the motor flange 12, the area | region divided so that it might dent over the end surface 32 of the case other end side edge part 11a, and the outer periphery 17b of the outer ring | wheel of the 1st main bearing 17. With respect to the flange, one end side 12a is positioned so that the inner peripheral side of the end portion 12a is fitted, and assembly is easily performed. For this reason, the fitting part of the case 11 and the motor flange 12 is comprised by utilizing effectively the outer periphery 17b of the outer ring | wheel of the 1st main bearing 17 which contact | abuts also to the inner periphery of the flange one end part 12a. Will be. Thereby, the fitting part of the case 11 and the motor flange 12 and the first main bearing 17 may be arranged side by side in an independent state along the axial direction P of the case 11 on the inner periphery of the case 11. Absent. For this reason, the outer periphery 17b of the outer ring of the first main bearing 17 can be effectively used as a part of the fitting portion of the case 11 and the motor flange 12, and the length of the case 11 in the axial direction P can be further shortened. .

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made as long as they are described in the claims. For example, the following modifications can be made.

(1) In this embodiment, the case where the first seal recess is formed on the end face of the other end of the case has been described as an example, but this need not be the case. What is necessary is just to be formed in at least any one of the end surface of a case other end side edge part, and the end surface of a flange one end side edge part. In the present embodiment, the case where the second seal recess is formed on the end face of the case one end side has been described as an example. However, this need not be the case. What is necessary is just to be formed in at least any one of the end surface of a side edge part, and the end surface of a housing other end side edge part. Further, in the present embodiment, the case where the first seal recess and the second seal recess are formed as groove-like portions has been described, but this need not be the case. For example, the first seal recess and the second seal recess may be formed as a stepped portion on the inner peripheral side of the ends of the case, the motor flange, and the seal housing.

(2) In the first embodiment, the case where the first fitting concave portion and the first fitting convex portion are provided on the outer peripheral side of the case and the motor flange has been described as an example, but this need not be the case. That is, the position of the bolt that joins the case and the motor flange and the position of the first seal member are appropriately adjusted in the radial direction of the case and the motor flange, so that the first fitting recess and the first
The fitting convex portion may be provided on the inner peripheral side of the case and the motor flange. Moreover, although 1st Embodiment demonstrated as an example the case where the 1st fitting recessed part was provided in the case other end side edge part, and the 1st fitting convex part was provided in the flange one end side part, It may not be the street. That is, the first fitting recess may be provided at one end of the flange and the first fitting protrusion may be provided at the other end of the case.

(3) In the first embodiment, the case where the second fitting concave portion and the second fitting convex portion are provided on the outer peripheral side of the case and the seal housing has been described as an example, but this need not be the case. That is, the position of the bolt that joins the case and the seal housing and the position of the third seal member are appropriately adjusted in the radial direction of the case and the seal housing, so that the second fitting recess and the second fitting protrusion May be provided on the inner peripheral side of the case and the seal housing. In the present embodiment, the case where the second fitting recess is provided at the end of the case one end and the second fitting protrusion is provided at the other end of the housing has been described as an example. It does not have to be. That is, the second fitting recess may be provided at the other end of the housing, and the second fitting protrusion may be provided at the one end of the case.

(4) Moreover, the eccentric reduction gear which is not provided with the 2nd fitting recessed part and the 2nd fitting convex part can also be implemented. FIG. 9 is an enlarged cross-sectional view showing a part of a cross section of an eccentric type speed reducer according to a modification, and is an enlarged cross-sectional view showing a third seal member 22 and a portion in the vicinity thereof corresponding to FIG. is there. In the following description of the modified example shown in FIG. 9, the same components as those in the first embodiment are denoted by the same reference numerals in the drawing, and the description thereof is omitted.

  In the eccentric type reduction gear according to the modification shown in FIG. 9, the third seal member 22 is a plane perpendicular to the axial direction P of the case 11 at the one end portion 11b of the case (like the eccentric type reduction gear 1). The bottom surface of the two seal recesses 40) and the flat surface (end surface 38) perpendicular to the axial direction P of the case 11 at the housing other end 19a are fixed in contact with each other. However, in the eccentric type speed reducer according to the modification of FIG. 9, the second fitting recess 41 and the second fitting projection 42 are not provided, and the case one end 11b and the housing other end 11 are provided. 19a is not configured to be guided and fitted to each other on the outer peripheral side. And the 2nd main bearing 18 is arrange | positioned so that the outer periphery 18b of the outer ring may contact | abut to the inner periphery of the case one end side edge part 11b, and also to the inner periphery of the housing other end side edge part 19a. For this reason, in the eccentric type speed reducer according to the modified example of FIG. 9, the housing other end side end portion 19a is located on the inner end 18a of the outer ring of the second main bearing 18 and the end surface 39 of the case end end portion 11b. It is comprised so that it may guide and fit on the circumference side.

  According to the eccentric type speed reducer according to the modification shown in FIG. 9, the third seal member 22 is located at the case one end side end 11b and the housing other end side end 19a, as in the eccentric type speed reducer 1 of the first embodiment. It is fixed in contact with each plane perpendicular to the axial direction P of the case 11. For this reason, the length in the axial direction P on one end side of the case 11 can be shortened.

Further, according to the eccentric type speed reducer according to the modification shown in FIG. 9, the second main bearing 18 is arranged such that the outer periphery 18b of the outer ring is in contact with the inner periphery of the case one end portion 11b. And when fixing and assembling the case 11 and the seal housing 19, it is in the area | region divided so that it might dent over the end surface 39 of the case one end side edge part 11b, and the outer periphery 18b of the outer ring | wheel of the 2nd main bearing 18. On the other hand, the housing is positioned so that the inner peripheral side of the other end 19a of the housing is fitted, and assembly is easily performed. For this reason, the outer periphery 18b of the outer ring of the 2nd main bearing 18 which contact | abuts also to the inner periphery of the housing other end side edge part 19a is utilized effectively, and the fitting location of the case 11 and the seal housing 19 comprises. Will be. Thereby, the fitting part of the case 11 and the seal housing 19 and the second main bearing 18 may be arranged side by side in an independent state along the axial direction P of the case 11 on the inner periphery of the case 11. Absent. For this reason, the second
The outer periphery 18b of the outer ring of the main bearing 18 can be effectively utilized as a part of the fitting portion of the case 11 and the seal housing 19, and the length of the case 11 in the axial direction P can be further shortened.

(5) In this embodiment, the case where the bearing holding member is provided as a member formed separately from the pinion has been described. However, this need not be the case, and the bearing holding member is formed integrally with the pinion. It may be provided as a member.

(6) In addition, the crankshaft, the carrier, and the like can be implemented by changing various forms. For example, the present invention may be applied to a center crank type eccentric speed reducer in which a crankshaft is disposed on a rotation center line. Further, the output shaft may not be integrated with the carrier but may be provided as a separate member from the carrier. Moreover, the support | pillar which connects a base carrier and an end part carrier does not need to be integrally formed in a base carrier, and may be formed as a member different from a base carrier. Further, the number of crankshafts and struts, the number of eccentric parts of the crankshaft and the number of external gears can be changed as appropriate.

  In the present invention, the swinging speed reduction mechanism is disposed inside the case, the motor flange to which the electric motor is attached is attached so as to cover the opening of the case, and the lubricating oil in the case is sealed between the case and the motor flange. It can be widely applied as an eccentric type speed reducer.

DESCRIPTION OF SYMBOLS 1 Eccentric type reduction gear 11 Case 11a Case other end side end 12 Motor flange 12a Flange one end side end 13 Input shaft 14 Oscillating speed reduction mechanism 15 Carrier 16 Output shaft 17 First main bearing 18 Second main bearing 20 First seal Member 24 Pin internal teeth (internal teeth)
25 Crankshaft 28 Base carrier 29 End carrier 30 Support column 32 End surface 33 of the case other end side end surface End surface 34 of the flange one end side First seal recess

Claims (7)

A case formed in a cylindrical shape and having internal teeth arranged on the inner periphery;
An external gear provided on the outer periphery with external teeth meshing with the internal teeth, and a crankshaft for rotating the external gear eccentrically, and a swing reduction mechanism disposed inside the case;
A base carrier that rotatably holds one end side of the crankshaft, an end carrier that rotatably holds the other end side of the crankshaft, and the base carrier and the end carrier disposed between the base carrier and the end carrier. A carrier for connecting a base carrier and the end carrier, and a carrier disposed inside the case;
An output shaft fixed to the base carrier and to which a pinion is attached;
An input shaft to which driving force from the electric motor is input is arranged on the inner side, and the motor flange is attached to the case so as to cover the opening of the case, to which the electric motor is attached,
A first main bearing disposed between an outer periphery of the end carrier and an inner periphery on the other end side of the case, and rotatably holding the carrier with respect to the case;
A second main bearing disposed between an outer periphery of the output shaft and an inner periphery on one end side of the case, and rotatably holding the output shaft with respect to the case;
An eccentric speed reducer with
In the circumferential direction, at least one of an end surface of the flange one end side which is an end portion on one end side of the motor flange and an end surface of the case other end side which is an end portion on the other end side of the case A first seal member disposed in a first seal recess formed in a recess so as to extend over the first seal member formed in a ring shape;
The first seal member is fixed in contact with a plane perpendicular to the axial direction of the case at one end of the flange and a plane perpendicular to the axial direction of the case at the other end of the case. An eccentric type speed reducer characterized by sealing lubricating oil in the case. The eccentric speed reducer according to claim 1,
One of the outer peripheral side of the flange one end side and the outer peripheral side of the case other end side end is formed to extend in the circumferential direction and has a stepped recess. A common recess is provided,
The other of the outer peripheral side of the flange one end side end and the outer end side of the case other end side end is formed in a convex shape extending in the circumferential direction, and the first fitting recess On the other hand, an eccentric type speed reducer characterized in that a first fitting convex portion that fits on the outside thereof is provided. The eccentric speed reducer according to claim 2,
The first fitting recess is provided on the outer peripheral side of the other end of the case, and the first fitting convex is provided on the outer peripheral side of the flange one end. Eccentric reducer. The eccentric speed reducer according to claim 1,
The first main bearing is arranged so that an outer periphery of an outer ring thereof is in contact with an inner periphery of an end of the other end of the case and an inner periphery of the end of the one end of the flange. , Eccentric reducer. An eccentric type speed reducer according to any one of claims 1 to 4,
A bearing holding member attached to the outer periphery of the output shaft and supporting one end of the second main bearing;
A second seal member that contacts the outer periphery of the bearing holding member and seals the lubricating oil in the case;
A seal housing that is attached to a case one end side that is an end on one end side of the case and holds the second seal member;
At least one of the end surface of the case one end side and the end surface of the other end of the housing, which is the end of the other end of the seal housing, is recessed to extend in the circumferential direction. A third seal member disposed in the second seal recess and formed in a ring shape;
Further comprising
The third seal member is fixed in contact with a plane perpendicular to the axial direction of the case at one end of the case and a plane perpendicular to the axial direction of the case at the other end of the housing. An eccentric type speed reducer characterized by sealing lubricating oil in the case. The eccentric speed reducer according to claim 5,
A second fitting that is formed so as to extend in the circumferential direction and is recessed in a step shape on one of the outer peripheral side of the one end of the case and the outer peripheral side of the end of the other end of the housing. A common recess is provided,
On the other of the outer peripheral side of the case one end side end and the outer end side of the housing other end side end, a convex shape extending in the circumferential direction is formed, and the second fitting recess On the other hand, an eccentric type speed reducer characterized in that a second fitting convex portion that fits on the outside thereof is provided. The eccentric speed reducer according to claim 6,
The second fitting recess is provided on the outer peripheral side of the one end of the case, and the second fitting convex is provided on the outer periphery of the housing other end. Eccentric reducer.

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