Gearmotors, gearmotor oil tanks, reducer units, reducer unit oil tanks

Abstract

The gear motor 100 includes a reducer 8 filled with lubricating oil 8f, a motor 30, and an oil tank 40 communicating with the lubricating oil filled space 8s of the reducer 8. The oil tank 40 has an opposing side surface 42f facing the device-side side surface 10f of at least one of the reducer 8 or the motor 30, and an outer side surface 42e facing the opposing side surface 42f and positioned outward. The opposing side surface 42f and the outer side surface 42e are either convex curved surfaces or flat surfaces that extend away from the device-side side surface 10f.

Description

[Technical field]

[0001] The present invention relates to a gear motor, an oil tank for a gear motor, a reduction gear unit, and an oil tank for a reduction gear unit. [Background technology]

[0002] The present applicant has disclosed in Patent Document 1 a motor-equipped reduction gear device having a motor and a reduction mechanism. This reduction mechanism includes a two-stage reduction mechanism, a front-stage reduction mechanism and a rear-stage reduction mechanism. The front-stage reduction mechanism is a oscillating internal meshing type reduction mechanism, and the rear-stage reduction mechanism is a bevel gear mechanism having a bevel pinion and a bevel gear that mesh with each other. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2012-193799 A Summary of the Invention [Problem to be solved by the invention]

[0004] The present inventors have come to the following realization regarding the reduction gear transmission. In a reduction gear device equipped with a reduction gear mechanism, oil is injected into the reduction gear mechanism for lubrication and cooling. In a reduction gear device injected with oil, the lubrication characteristics can be improved to improve the performance of the reduction gear device. For this reason, it is considered to oil-bath lubrication the reduction gear mechanism. In oil-bath lubrication, increasing the amount of oil increases the oil supply time and increases churning loss. If the churning loss increases, the oil temperature rises during operation, and the load capacity and operating time of the reduction gear device are limited by the allowable oil temperature. From these findings, the present inventors recognized that there is room for improvement in the reduction gear transmission from the viewpoint of efficiently cooling the oil.

[0005] The present invention has been made in consideration of the above problems, and has an object to provide a reduction gear unit and a gear motor including a reduction gear that can efficiently cool lubricating oil. [Means for solving the problem]

[0006] In order to solve the above problems, a gear motor according to one embodiment of the present invention is a gear motor including a reducer filled with lubricating oil, a motor, and an oil tank communicating with the lubricating oil filled space of the reducer, the oil tank having an opposing side surface facing the device side surface of at least one of the reducer or the motor, and an outer side surface facing the opposing side surface and positioned on the outside. The opposing side surface and the outer side surface are convex curved surfaces or flat surfaces in the direction away from the device side surface.

[0007] Any combination of the above components, or mutual substitution of the components or expressions of the present invention between methods, systems, etc. are also valid aspects of the present invention. Effect of the Invention

[0008] According to the present invention, it is possible to provide a reduction gear unit capable of efficiently cooling lubricating oil, and a gear motor including a reduction gear. [Brief description of the drawings]

[0009] [Figure 1] 1 is a perspective view showing a gear motor according to a first embodiment. FIG. [Diagram 2] FIG. 2 is a side view showing the gear motor of FIG. [Diagram 3] FIG. 2 is a perspective view showing the oil tank of FIG. [Figure 4] FIG. 2 is another perspective view showing the oil tank of FIG. 1. [Diagram 5] FIG. 2 is a front view showing the oil tank of FIG. [Figure 6] FIG. 2 is a rear view showing the oil tank of FIG. [Figure 7] FIG. 2 is a right side view showing the oil tank of FIG. [Figure 8] FIG. 2 is a left side view showing the oil tank of FIG. [Figure 9] FIG. 2 is a plan view showing the oil tank of FIG. [Figure 10] FIG. 2 is a bottom view showing the oil tank of FIG. [Figure 11] FIG. 2 is a plan view showing the oil tank of FIG. 1 with the lid removed. [Figure 12] FIG. 11 is a perspective view showing a reduction gear unit according to a second embodiment. [Figure 13] FIG. 13 is a side view showing the reduction gear unit of FIG. 12.

[0010] The present invention will be described below based on preferred embodiments with reference to the drawings. In the embodiments, comparative examples, and modified examples, the same or equivalent components and members are given the same reference numerals, and duplicated descriptions are omitted as appropriate. The dimensions of the members in each drawing are enlarged or reduced as appropriate to facilitate understanding. Some of the members that are not important for explaining the embodiments are omitted in each drawing. In addition, terms including ordinal numbers such as first, second, etc. are used to describe various components, but these terms are used only for the purpose of distinguishing one component from another component, and the components are not limited by these terms.

[0011] [First embodiment] The configuration of the gear motor 100 according to the first embodiment will be described with reference to the drawings. FIG. 1 is a perspective view showing the gear motor 100 according to the first embodiment. FIG. 2 is a side view showing the gear motor 100. This figure is partially cut away. The gear motor 100 includes a motor 30, a reducer 8, and an oil tank 40. The motor 30 inputs rotation to the reducer 8. The reducer 8 reduces the rotation input from the motor 30 and outputs it. The reducer 8 has an enclosed space 8s in which lubricating oil 8f is enclosed. The oil tank 40 communicates with the enclosed space 8s in which the lubricating oil 8f is enclosed. The gear motor 100 configured in this manner reduces the rotation of the motor 30 and outputs it from the reducer 8. Of the sides of the motor 30 and the reducer 8, the side facing the side of the oil tank 40 is defined as the device side side 10f. Therefore, the device side side 10f includes at least one side of the motor 30 or the reducer 8. In the gear motor 100 of this embodiment, the motor 30 is disposed on the upper side and the reducer 8 on the lower side in the vertical direction. More specifically, the motor 30 is disposed with its axial direction facing the vertical direction. The lubricating oil 8f is preferably liquid oil, but may be semi-liquid grease.

[0012] Hereinafter, the direction along the central axis La of the motor shaft 30s of the motor 30 will be referred to as the "axial direction," and the circumferential direction and radial direction of a circle centered on the central axis La will be referred to as the "circumferential direction" and the "radial direction," respectively. For convenience, one side in the axial direction (upper side in the figure) will be referred to as the input side, and the other side (lower side in the figure) will be referred to as the anti-input side. The horizontal direction will be referred to as the "horizontal" or "horizontal direction," and the vertical direction will be referred to as the "upper / lower direction."

[0013] (Motor) The motor 30 may be any of various types of known motors. The motor 30 of this embodiment is a brushless DC motor (sometimes referred to as an AC servo motor). The motor 30 includes a motor shaft 30s, a magnet 30m, a stator core 30c, an armature coil 30d, and a motor casing 30h. The magnet 30m is an annular magnet fixed to the outer periphery of the motor shaft 30s. The magnet 30m has magnetic poles on its outer periphery to form a rotor. The stator core 30c has a plurality of teeth (not shown) that face the outer periphery of the magnet 30m in the radial direction via a magnetic gap. The armature coil 30d is wound around the plurality of teeth of the stator core 30c.

[0014] The motor casing 30h functions as an outer shell that houses the magnet 30m, the stator core 30c, and the armature coil 30d. The motor casing 30h of this embodiment has a bottomed cylindrical shape with the input side closed, and surrounds the stator core 30c. A plurality of cooling fins 30j are provided on the outer periphery of the motor casing 30h. The stator core 30c is fixed to the inner periphery of the motor casing 30h, for example, by adhesive.

[0015] In the motor 30 of this embodiment, a terminal box 30b is provided on a side surface of a motor casing 30h. The terminal box 30b covers a power receiving terminal 30t for receiving power supplied from a drive device (not shown). The terminal box 30b of this embodiment has a substantially rectangular parallelepiped outer shape protruding outward from the motor casing 30h. As an example, the outline of the terminal box 30b in a top view is substantially rectangular. The motor 30 rotates and drives the motor shaft 30s based on a known principle, based on the power supplied to the power receiving terminal 30t.

[0016] The motor shaft 30s is formed integrally with the first input shaft 12 of the first reduction gear 10, and the motor 30 rotates and drives the first input shaft 12 via the motor shaft 30s.

[0017] (reducer) The reducer 8 of this embodiment includes a first reducer 10 and a second reducer 20. The first reducer 10 may be any of various types of known reducers. The first reducer 10 of this embodiment is an eccentric oscillating reducer. The first reducer 10 rotates the external gear meshing with the internal gear, causing the external gear to rotate on its axis, and outputs the rotation component from the carrier to the second reducer 20. The second reducer 20 may be any of various types of known reducers. The second reducer 20 of this embodiment is a bevel gear mechanism. The second reducer 20 reduces the rotation input to the second input shaft 22 extending vertically, and outputs it to the output shaft 28 extending horizontally. The output shaft 28 is also the output shaft of the gear motor 100.

[0018] (1st reducer) The first reduction gear 10 of this embodiment is a so-called center crank type eccentric oscillating gear device in which an eccentric body (not shown) rotates around a central axis La. The first reduction gear 10 mainly includes a first input shaft 12, an external gear 14, an internal gear 15, a carrier 16, and a first casing 18. The first input shaft 12 rotates around the central axis La by a rotational driving force input from the motor 30 via a motor shaft 30s. The first input shaft 12 is supported by the first casing 18 by an input shaft bearing 12a arranged on the input side of the external gear 14 and an input shaft bearing 12b arranged on the opposite input side of the external gear 14.

[0019] The external gear 14 is configured to oscillate and rotate with the rotation of the first input shaft 12. The external gear 14 internally meshes with the internal gear 15 while oscillating. The internal gear 15 meshes with the external gear 14. The internal gear 15 may be configured to be rotatable, but the internal gear 15 in this example is fixed to the inside of the first casing 18. The number of internal teeth of the internal gear 15 is slightly more (by one in this example) than the number of external teeth of the external gear 14.

[0020] The carrier 16 in this embodiment is configured to rotate about the axis of the first input shaft 12 in synchronization with the rotation component of the external gear 14. The carrier 16 functions as an output member that outputs a rotational driving force to the second input shaft 22 of the second reduction gear 20. The carrier 16 is disposed on the side portion of the anti-input side of the external gear 14, and is rotatably supported by the first casing 18 via a carrier bearing 16b. The carrier 16 rotatably supports the anti-input side of the first input shaft 12 via the input shaft bearing 12b.

[0021] The first casing 18 functions as an outer shell that houses the external gear 14, the internal gear 15, the carrier 16, etc. The first casing 18 has a hollow, generally circular shape in a plan view, and is composed of one or more members. The input side of the first casing 18 is connected to the opposite input side of the motor casing 30h. The opposite input side of the first casing 18 is connected to the input side of the second casing 20h, which will be described later. The first casing 18 forms an upper portion of an enclosed space 8s for lubricating oil 8f therein.

[0022] The first casing 18 is provided with a first through hole 18h and a second through hole 18j. The second through hole 18j is disposed at a higher position than the first through hole 18h. The first through hole 18h communicates with the enclosed space 8s. The second through hole 18j communicates with the enclosed space 8s or the space above the enclosed space 8s. The first through hole 18h communicates with the tank body 42 through the first pipe 52. The first pipe 52 allows the movement of the lubricating oil 8f between the enclosed space 8s and the tank body 42. The second through hole 18j communicates with the tank body 42 through the second pipe 54. The second pipe 54 allows the movement of air between the enclosed space 8s and the tank body 42. The oil tank 40 connected in this manner also functions as an escape route for the lubricating oil 8f and air when the pressure of the enclosed space 8s rises during operation.

[0023] (2nd reducer) The second reduction gear 20 of this embodiment mainly includes a second input shaft 22, a bevel pinion 24, a bevel gear 26, an output shaft 28, and a second casing 20h. The bevel pinion 24 is a bevel-shaped gear provided coaxially with the second input shaft 22, and is fixed to the outer periphery of the second input shaft 22. The bevel pinion 24 may be formed integrally with the second input shaft 22. The second input shaft 22 is rotatably supported by the second casing 20h via a second input shaft bearing 22b. The second input shaft 22 rotates around the central axis La by the rotational driving force input from the first reduction gear 10 via the carrier 16. The second input shaft 22 is connected to the opposite input side of the carrier 16.

[0024] The bevel gear 26 is a bevel-shaped gear provided coaxially with the output shaft 28, and is fixed to the outer periphery of the output shaft 28. The bevel gear 26 may be formed integrally with the output shaft 28. The bevel gear 26 meshes with the bevel pinion 24. The output shaft 28 is supported by the second casing 20h via an output shaft bearing 28b, and rotates about a central axis Lb perpendicular to the central axis La. The output shaft 28 in this example is a hollow shaft, and a driven body (not shown) is connected to the hollow portion 28h.

[0025] The second casing 20h functions as an outer shell that houses the second input shaft 22, the bevel pinion 24, the bevel gear 26, the output shaft 28, etc. The second casing 20h has a substantially rectangular parallelepiped outline and is composed of one or more members. The input side of the second casing 20h is connected to the opposite input side of the first casing 18. A bottom is provided on the opposite input side of the second casing 20h. The second casing 20h forms the lower part of the sealed space 8s for the lubricating oil 8f inside.

[0026] The enclosed space 8s of the first casing 18 and the enclosed space 8s of the second casing 20h are in communication with each other. The lubricating oil 8f injected into the enclosed space 8s can move between the first casing 18 and the second casing 20h. Therefore, the lubricating oil 8f injected into the enclosed space 8s of the first casing 18 fills not only the first casing 18 but also the enclosed space 8s of the second casing 20h. The oil level Sc of the lubricating oil 8f in the enclosed space 8s is formed midway through the first casing 18. The space above the oil level Sc in the enclosed space 8s is filled with air. Due to convection, the lubricating oil 8f with an increased temperature moves to the space on the first casing 18 side.

[0027] (Oil tank) The oil tank 40 will now be described. Fig. 3 is a perspective view showing the oil tank 40. Fig. 4 is a perspective view showing the oil tank 40 from another angle. Fig. 5 is a front view showing the oil tank 40. Fig. 6 is a rear view showing the oil tank 40. Fig. 7 is a right side view showing the oil tank 40. Fig. 8 is a left side view showing the oil tank 40. Fig. 9 is a plan view showing the oil tank 40. Fig. 10 is a bottom view showing the oil tank 40.

[0028] The oil tank 40 is an introduction passage for injecting the lubricating oil 8f, and has the function of storing and air-cooling a portion of the lubricating oil 8f. An air breather 46 and an oil gauge 43 are attached to the oil tank 40. The oil tank 40 of this embodiment mainly includes a tank body 42 and a lid 44. The tank body 42 is a bottomed container that contains the lubricating oil 8f, and the top surface is open. The lid 44 functions as a cover that covers the top surface of the tank body 42. The lid 44 of this embodiment has a substantially rectangular shape in a plan view.

[0029] (Tank body) The tank body 42 has an opposing side surface 42f, an outer side surface 42e, a connecting side surface 42k, and a bottom surface 42b. The opposing side surface 42f is a side surface that faces the device side surface 10f of at least one of the reducer 8 or the motor 30. The outer side surface 42e is a side surface that faces the opposing side surface 42f and is located on the outside. The connecting side surface 42k is a side surface that connects the opposing side surface 42f and the outer side surface 42e.

[0030] The widths of the opposing side surface 42f and the outer side surface 42e are approximately equal to each other. The widths of the two connecting side surfaces 42k are approximately equal to each other. The width of the connecting side surface 42k is smaller than the widths of the opposing side surface 42f and the outer side surface 42e. In this case, the protruding dimension of the tank body 42 from the reducer 8 can be made smaller than when the width of the connecting side surface 42k is large. In this case, the ratio of the total surface area of ​​each side surface to the capacity of the tank body 42 is increased, improving the cooling performance of the lubricating oil 8f.

[0031] It is desirable that the oil tank 40 has a certain capacity or more and that the radial protrusion from the central axis La is small. Therefore, the opposing side surface 42f and the outer side surface 42e are made to be convex or flat surfaces in the direction away from the device side surface 10f. Compared to the case of convex surfaces in the direction toward the motor, the protrusion can be reduced while ensuring the capacity. In this embodiment, the opposing side surface 42f is a flat surface, and the outer side surface 42e is made to be a convex surface in the direction away from the motor. The connecting side surface 42k may be made to be an outward convex or flat surface. The bottom surface 42b constitutes the lower surface of the tank body 42.

[0032] In this embodiment, the opposing side surface 42f, the outer side surface 42e, the connecting side surface 42k, and the bottom surface 42b are integrally formed. The tank body 42 may be formed of an iron-based metal, a non-ferrous light metal, or a non-metallic material. The tank body 42 in this embodiment is formed by casting an iron-based metal or a non-ferrous light metal into a mold, and is subjected to a predetermined machining process.

[0033] From the viewpoint of improving the cooling performance of the lubricating oil 8f, it is desirable that the cross-sectional area of ​​the upper side of the tank body 42 that is in contact with the air is large. Therefore, the tank body 42 of this embodiment is configured so that the cross-sectional area in a plan view decreases with increasing distance from the lid 44 side. For example, the opposing side surface 42f, the outer side surface 42e, and the connecting side surface 42k may be formed so that the width decreases with increasing distance from the lid 44 side. The opposing side surface 42f and the outer side surface 42e may be arranged so that the separation distance decreases with increasing distance from the lid 44 side. The two connecting side surfaces 42k may be formed so that the separation distance decreases with increasing distance from the lid 44 side.

[0034] If the terminal box 30b and the oil tank 40 are provided in different directions, the outline in plan view will be large, which will be disadvantageous in terms of installation space and transportation space. Therefore, the oil tank 40 of this embodiment is arranged so as to overlap with the terminal box 30b of the motor 30 when viewed from the axial direction (vertical direction) of the motor 30. For example, the outer outline of the oil tank 40 in plan view may be entirely included in the outer outline of the terminal box 30b in plan view, or a part of it may protrude from the outer outline of the terminal box 30b in plan view.

[0035] The tank body 42 has a first tank hole 42h that is connected to the first through hole 18h via the first pipe 52, and a second tank hole 42j that is connected to the second through hole 18j via the second pipe 54. The first tank hole 42h may be located at a lower position than the second tank hole 42j. The first tank hole 42h of this embodiment is a circular opening provided in the vicinity of the lower end of the opposing side surface 42f, approximately at the center in the width direction of the opposing side surface 42f. The second tank hole 42j of this embodiment is a circular opening provided in a position slightly lower than the upper end of the opposing side surface 42f, near the boundary between the opposing side surface 42f and the connecting side surface 42k. The first tank hole 42h may be larger than the second tank hole 42j.

[0036] (Mounting protrusion) The tank body 42 has a mounting protrusion 42c that protrudes from the opposing side surface 42f toward the reducer 8. The mounting protrusion 42c has a generally rectangular shape with a longitudinal direction along the lateral direction in a plan view. The mounting protrusion 42c in this embodiment is disposed at a height position generally equal to the center of gravity G of the oil tank 40 in a state in which a predetermined amount of lubricating oil 8f is stored.

[0037] The mounting protrusion 42c is fixed to a side surface of the reducer 8. In this embodiment, the mounting protrusion 42c is fixed to a mounting portion 18p provided on the first casing 18 of the first reducer 10 by a fastener such as a bolt. The oil tank 40 has a middle portion fixed to the first casing 18 of the first reducer 10 by the mounting protrusion 42c, an upper portion supported by the first casing 18 via the second pipe 54, and a lower portion supported by the first casing 18 via the first pipe 52. This configuration allows the oil tank 40 to withstand vibrations and shocks within a certain range.

[0038] (Mounting base) The lid 44 is attached to a mounting seat provided on the tank body 42 by a fastener such as a screw 44s. FIG. 11 is a plan view showing the oil tank 40 with the lid 44 removed. The tank body 42 is provided with a mounting seat for mounting the lid 44. In the example of FIG. 11, a plurality of mounting seats are provided on the upper surfaces of the opposing side surface 42f, the outer side surface 42e, and the connecting side surface 42k. Two protruding mounting seats 42q protruding in a direction approaching the device side surface 10f are provided spaced apart from each other on the upper surface of the opposing side surface 42f. Two protruding mounting seats 42p protruding in a direction approaching the device side surface 10f are provided spaced apart from each other on the upper surface of the outer side surface 42e.

[0039] Two mounting seats 42r are provided on the upper surface of the connection side surface 42k, spaced apart from each other. The heights of the mounting seats 42p, 42q, 42r may be different from each other or may be the same. The mounting seats 42p, 42q, 42r may be higher than the surroundings, may be flush with the surroundings, or may be lower than the surroundings. The mounting seats 42p, 42q, 42r may be formed with screw holes 42s for screwing in the screws 44s.

[0040] (Air Breather) The air breather 46 is easily attached and detached to the oil feed hole 44h of the lid 44. In the example of Figs. 2 to 4, the male thread of the air breather 46 is screwed into the female thread of the oil feed hole 44h. When the air breather 46 is removed, the oil feed hole 44h provided in the lid 44 is exposed, and the lubricating oil 8f can be poured into the tank body 42 through this oil feed hole 44h. In other words, the air breather 46 also functions as a plug for the oil feed hole 44h.

[0041] (Oil gauge) The oil gauge 43 is attached to the tank body 42 in order to check the amount of the stored lubricating oil 8f. The oil gauge 43 in this embodiment is a vertically elongated tubular member, and the oil level St can be visually observed. In the example of Figs. 1 to 3, the upper and lower parts of the oil gauge 43 are attached to gauge mounting parts 42m and 42n provided on the connecting side surface 42k of the tank body 42, and communicate with the inside of the tank body 42. The oil gauge 43 is positioned so that the oil level St is located near the vertical center of the oil gauge 43.

[0042] A method of oiling the gear motor 100 configured as above will be described. First, the air breather 46 is removed from the oil tank 40 to expose the oil feed hole 44h. An oil feed nozzle (not shown) is inserted into the exposed oil feed hole 44h, and the lubricating oil 8f is poured in from the outside. The lubricating oil 8f poured into the oil tank 40 is supplied to the enclosed space 8s of the first casing 18 and the enclosed space 8s of the second casing 20h through the first tank hole 42h, the first pipe 52, and the first through hole 18h. While checking the oil level St (approximately equal to the oil level Sc in the enclosed space 8s) with the oil gauge 43, the lubricating oil 8f is poured in until it reaches a predetermined height. After the injection is completed, the air breather 46 is attached to the oil tank 40 and the oil feed hole 44h is closed.

[0043] The operation of the gear motor 100 configured as above will be described. When rotation is transmitted from the motor 30 to the first input shaft 12, the eccentric portion of the first input shaft 12 rotates around a rotation center line passing through the first input shaft 12, and the eccentric portion causes the external gear 14 to oscillate. At this time, the external gear 14 oscillates so that its own axis rotates around the rotation center line of the first input shaft 12. When the external gear 14 oscillates, the meshing positions of the external gear 14 and the internal gear 15 are sequentially shifted. As a result, the external gear 14 rotates on its axis by an amount equivalent to the difference in the number of teeth between the external gear 14 and the internal gear 15 every time the first input shaft 12 rotates once.

[0044] When the external gear 14 rotates, the rotation component is transmitted to the second input shaft 22 of the second reduction gear 20 via the carrier 16. When the rotation is transmitted from the first reduction gear 10 to the second input shaft 22, the bevel pinion 24 rotates integrally with the second input shaft 22, and the rotation is transmitted to the bevel gear 26 meshing with the bevel pinion 24. When the rotation is transmitted to the bevel gear 26, the output shaft 28 rotates integrally with the bevel gear 26, and the driven body connected to the output shaft 28 rotates.

[0045] The operation and effects of the gear motor 100 of this embodiment configured as above will be described.

[0046] The gear motor 100 of this embodiment is a gear motor equipped with a reducer 8 in which lubricating oil 8f is sealed, a motor 30, and an oil tank 40 connected to the lubricating oil sealing space 8s of the reducer 8, and the oil tank 40 has an opposing side 42f that faces the equipment side side 10f of at least one of the reducer 8 or the motor 30, and an outer side 42e that faces the opposing side 42f and is located on the outside, and the opposing side 42f and the outer side 42e are convex curved surfaces or flat surfaces in the direction away from the equipment side side 10f.

[0047] According to this configuration, the lubricating oil 8f in the enclosed space 8s can be efficiently cooled by the oil tank 40. Also, compared to a configuration in which these side surfaces are convex curved surfaces in the approach direction, the capacity of the oil tank 40 can be increased under the condition that the protrusion amount of the corners of the oil tank 40 is constant.

[0048] The facing side surface 42f may be a flat surface, and the outer side surface 42e may be a convex surface that is curved in a direction away from the device-side side surface 10f. In this case, since the facing side surface 42f is a flat surface, the oil tank 40 can be easily processed, and since the outer side surface 42e is a convex surface, the capacity of the oil tank 40 can be increased under the condition that the protruding amount of the corners is constant.

[0049] The oil tank 40 has a tank body 42 having an opposing side surface 42f and an outer side surface 42e, and a lid 44. The opposing side surface 42f and the outer side surface 42e may be provided with protruding mounting seats 42p, 42q that protrude in a direction approaching the equipment side surface 10f as mounting seats for mounting the lid 44. In this case, the protruding mounting seat 42p on the outer side surface 42e does not protrude to the outside, which reduces the concern that the surrounding equipment will be damaged during transportation or manufacturing. In addition, since the protruding mounting seat 42q on the opposing side surface 42f protrudes to the outside, the contact area with the outside air is increased, improving the cooling efficiency.

[0050] The tank body 42 may be configured so that the cross-sectional area decreases with increasing distance from the lid 44. In this case, since the cross-sectional area of ​​the upper portion is large, it is possible to increase the surface area contributing to cooling accordingly, thereby improving the cooling performance of the lubricating oil 8f.

[0051] The oil tank 40 may be configured to overlap the terminal box 30b of the motor 30 when viewed vertically. In this case, the outline in a plan view is smaller than in a configuration in which the terminal box 30b and the oil tank 40 do not overlap, which is advantageous in terms of installation space and transportation space.

[0052] The operation and effects of the oil tank 40 of this embodiment configured as above will be described.

[0053] The oil tank 40 is an oil tank that communicates with the lubricating oil containing space 8s of the reducer 8 of the gear motor 100 having the reducer 8 and the motor 30, and the oil tank 40 has an opposing side 42f that faces the equipment side side 10f of at least one of the reducer 8 or the motor 30, and an outer side 42e that faces the opposing side 42f and is located on the outside, and the opposing side 42f and the outer side 42e are convex curved surfaces or flat surfaces in the direction away from the equipment side side 10f.

[0054] According to this configuration, the capacity of the oil tank 40 can be increased under the condition that the protrusion amount of the corners of the oil tank 40 is constant, compared to a configuration in which these side surfaces are convex curved surfaces in the approach direction.

[0055] The above is a description of the first embodiment.

[0056] [Second embodiment] The configuration of the reduction gear unit 200 according to the second embodiment will be described with reference to Figs. 12 and 13. Fig. 12 is a perspective view showing the reduction gear unit 200 according to the second embodiment. Fig. 13 is a side view showing the reduction gear unit 200. This figure shows a part broken away. The reduction gear unit 200 of this embodiment does not include a motor, and the shape of the input side of the reduction gear 8 is different from that of the first embodiment, but the other configurations are similar. In the description of this embodiment, the same reference numerals are used for components and members that are the same as or equivalent to those of the first embodiment, and duplicated descriptions are omitted as appropriate, with a focus on the configuration that differs from the first embodiment.

[0057] The reduction gear unit 200 includes a reduction gear 8 and an oil tank 40. The reduction gear 8 reduces the rotation input to the input shaft 12 and outputs it. In the following description of this embodiment, the direction along the central axis Ls of the input shaft 12 of the reduction gear 8 is referred to as the "axial direction", and the circumferential direction and radial direction of a circle centered on the central axis Ls are referred to as the "circumferential direction" and the "radial direction", respectively. In addition, for convenience, one side in the axial direction (upper side in the figure) is referred to as the input side, and the other side (lower side in the figure) is referred to as the anti-input side. In addition, the horizontal direction may be referred to as the "horizontal" or "horizontal direction", and the vertical direction may be referred to as the "upper / lower direction" or "upper / lower direction".

[0058] The first casing 18 includes an input side member 18m that covers the input side of the reduction gear 8. An input shaft bearing 12a that supports the input shaft 12 is provided in a through hole 18n provided in the center of the input side member 18m.

[0059] The input shaft 12 of the reduction gear unit 200 is connected to an output shaft of a prime mover (not shown) such as a motor by a spline or the like, and rotation is input from the prime mover to the input shaft 12. The reduction gear 8 has an enclosed space 8s in which lubricating oil 8f is enclosed. The oil tank 40 communicates with the enclosed space 8s in which the lubricating oil 8f is enclosed.

[0060] The reduction gear unit 200 reduces the rotation input from the prime mover to the input shaft 12 and outputs it from the reduction gear 8. In this embodiment, the side of the reduction gear 8 that faces the side of the oil tank 40 is referred to as the predetermined side 10f. In the reduction gear unit 200 of this embodiment, the reduction gear 8 is disposed below the prime mover in the vertical direction. More specifically, the reduction gear 8 is installed with its axial direction facing the vertical direction.

[0061] The oil tank 40 will be described. The oil tank 40 has a tank body 42 having an opposing side surface 42f and an outer side surface 42e, and a lid 44. The opposing side surface 42f faces the specified side surface 10f of the reducer 8. The outer side surface 42e faces the opposing side surface 42f and is located on the outside. The opposing side surface 42f is a flat surface, and the outer side surface 42e is a convex curved surface that is curved away from the specified side surface 10f. The opposing side surface 42f and the outer side surface 42e are provided with protruding mounting seats 42p, 42q that protrude in a direction approaching the specified side surface 10f as mounting seats for mounting the lid 44. The cross-sectional area of ​​the tank body 42 decreases as it moves away from the lid 44 side.

[0062] The operation of the reduction gear unit 200 configured as above will be described. When rotation is transmitted from the prime mover to the first input shaft 12, the eccentric portion of the first input shaft 12 rotates about a rotation center line passing through the first input shaft 12, and the eccentric portion causes the external gear 14 to oscillate. At this time, the external gear 14 oscillates so that its own axis rotates about the rotation center line of the first input shaft 12. When the external gear 14 oscillates, the meshing positions of the external gear 14 and the internal gear 15 are sequentially shifted. As a result, the external gear 14 rotates on its axis by an amount equivalent to the difference in the number of teeth between the external gear 14 and the internal gear 15 every time the first input shaft 12 rotates once.

[0063] When the external gear 14 rotates, the rotation component is transmitted to the second input shaft 22 of the second reduction gear 20 via the carrier 16. When the rotation is transmitted from the first reduction gear 10 to the second input shaft 22, the bevel pinion 24 rotates integrally with the second input shaft 22, and the rotation is transmitted to the bevel gear 26 meshing with the bevel pinion 24. When the rotation is transmitted to the bevel gear 26, the output shaft 28 rotates integrally with the bevel gear 26, and the driven body connected to the output shaft 28 rotates.

[0064] The operation and effects of the reduction gear unit 200 of this embodiment configured as above will be described.

[0065] The reducer unit 200 of this embodiment is a reducer unit equipped with a reducer 8 in which lubricating oil 8f is sealed, and an oil tank 40 connected to the lubricating oil sealing space 8s of the reducer 8, and the oil tank 40 has an opposing side 42f facing the specified side 10f of the reducer 8, and an outer side 42e facing the opposing side 42f and located on the outside, and the opposing side 42f and the outer side 42e are convex curved surfaces or flat surfaces in the direction away from the specified side 10f.

[0066] According to this configuration, the lubricating oil 8f in the enclosed space 8s can be efficiently cooled by the oil tank 40. Also, compared to a configuration in which these side surfaces are convex curved surfaces in the approach direction, the capacity of the oil tank 40 can be increased under the condition that the protrusion amount of the corners of the oil tank 40 is constant.

[0067] The opposing side surface 42f may be a flat surface, and the outer side surface 42e may be a convex surface that is curved in a direction away from the predetermined side surface 10f. In this case, since the opposing side surface 42f is a flat surface, the processing of the oil tank 40 is easy, and since the outer side surface 42e is a convex surface, the capacity of the oil tank 40 can be increased under the condition that the protruding amount of the corners is constant.

[0068] The oil tank 40 has a tank body 42 having an opposing side surface 42f and an outer side surface 42e, and a lid 44. The opposing side surface 42f and the outer side surface 42e may be provided with protruding mounting seats 42p, 42q that protrude in a direction approaching the predetermined side surface 10f as mounting seats for mounting the lid 44. In this case, the protruding mounting seat 42p on the outer side surface 42e does not protrude to the outside, which reduces the concern that the surrounding equipment may be damaged during transportation or manufacturing. In addition, since the protruding mounting seat 42q on the opposing side surface 42f protrudes to the outside, the contact area with the outside air is increased, improving the cooling efficiency.

[0069] The tank body 42 may be configured so that the cross-sectional area decreases with increasing distance from the lid 44. In this case, since the cross-sectional area of ​​the upper portion is large, it is possible to increase the surface area contributing to cooling accordingly, thereby improving the cooling performance of the lubricating oil 8f.

[0070] The function and effect of the oil tank 40 of this embodiment will be described.

[0071] The oil tank 40 is an oil tank that communicates with the lubricating oil containing space 8s of the reducer 8 of the reducer unit 200 having the reducer 8, and the oil tank 40 has an opposing side 42f that faces the specified side 10f of the reducer 8, and an outer side 42e that faces the opposing side 42f and is located on the outside, and the opposing side 42f and the outer side 42e are convex curved surfaces or flat surfaces in the direction away from the specified side 10f.

[0072] According to this configuration, the capacity of the oil tank 40 can be increased under the condition that the protrusion amount of the corners of the oil tank 40 is constant, compared to a configuration in which these side surfaces are convex curved surfaces in the approach direction.

[0073] Above, examples of the embodiments of the present invention have been described in detail. Each of the above-mentioned embodiments merely shows a specific example of implementing the present invention. The contents of each embodiment do not limit the technical scope of the present invention, and many design changes such as changes, additions, and deletions of components are possible within the scope of the invention as defined in the claims. In each of the above-mentioned embodiments, the contents for which such design changes are possible are described with notations such as "in the embodiment" and "in the embodiment", but this does not mean that design changes are not permitted for contents without such notations. In addition, hatching on the cross section of the drawing does not limit the material of the object to which the hatching is applied.

[0074] The following describes the modified examples. In the drawings and description of the modified examples, the same or equivalent components and members as those in the respective embodiments are denoted by the same reference numerals. Descriptions that overlap with those in the respective embodiments will be omitted as appropriate, and the description will focus on configurations that differ from those in the respective embodiments.

[0075] In the description of the embodiment, an example was shown in which the air breather 46 and the oil supply hole 44h are provided in the lid 44, but the present invention is not limited to this. The air breather or the oil supply hole may be disposed in the upper part of the tank main body. The oil supply hole may be provided separately from the air breather.

[0076] In the embodiment, the terminal box 30b that covers the power receiving terminal 30t is provided, but the present invention is not limited to this. For example, the power receiving terminal may be exposed without providing a terminal box.

[0077] In the description of the embodiment, an example has been shown in which the tank body 42 is formed by casting, but the tank body may be formed by other known manufacturing methods such as die casting, pressing, and molding.

[0078] In the description of the embodiment, an example was given in which the first reducer 10 is an eccentric oscillating gear device of a center crank type, but the present invention is not limited to this, and various reduction mechanisms can be adopted. For example, the first reducer may be a so-called distribution type eccentric oscillating gear device in which an eccentric body rotates at a position offset from the central axis. In addition, the first reducer may be a flexible meshing reducer (sometimes called a wave reducer) having a cylindrical external gear, a cup-type or top hat-type flexible meshing reducer, or a simple planetary gear type reducer.

[0079] In the description of the embodiment, an example has been shown in which the reducer 8 is composed of two reducers, the first reducer 10 and the second reducer 20, but the present invention is not limited to this. The reducer may be composed of one reducer or three or more reducers.

[0080] Each of the above-described modified examples provides the same functions and effects as the above-described embodiment.

[0081] Any combination of the above-described embodiments and modifications is also useful as an embodiment of the present invention. A new embodiment resulting from the combination has the combined effects of each of the combined embodiments and modifications. [Industrial Applicability]

[0082] The present invention relates to a gear motor, an oil tank for a gear motor, a reduction gear unit, and an oil tank for a reduction gear unit. [Explanation of symbols]

[0083] 8···Reduction gear, 8f···lubricating oil, 8s···lubricating oil sealed space, 10···first reduction gear, 10f···equipment side surface, 20···second reduction gear, 30···motor, 30b···terminal box, 40···oil tank, 42···tank body, 42e···outer side surface, 42f···opposing side surface, 42p, 42q···protruding mounting seat, 44···lid, 100···gear motor, 200···reduction gear unit.

Claims

1. A gear motor including a reducer filled with lubricating oil, a motor, and an oil tank communicating with a lubricating oil filled space of the reducer via a pipe outside the motor and the reducer, The oil tank has an opposing side surface facing an equipment side surface of at least one of the reducer and the motor, and an outer side surface facing the opposing side surface and positioned outward, The opposing side surface and the outer side surface are convex curved surfaces or flat surfaces in a direction away from the device-side side surface, and the opposing side surface is not a side surface formed along the same curvature as the device-side side surface, A gear motor, characterized in that the outer side surface has a shape in which the outer shape gradually becomes smaller from the motor toward the reducer.

2. 2. The gear motor according to claim 1, wherein the opposing side surface is a flat surface, and the outer side surface is a convex curved surface extending in a direction away from the device side surface.

3. The oil tank includes a tank body having the opposing side surface and the outer side surface, and a lid, 3. The gear motor according to claim 1, wherein the opposing side surface and the outer side surface are provided with mounting seats for mounting the lid, the mounting seats protruding in a direction approaching the device side surface.

4. 4. The gear motor according to claim 3, wherein the cross-sectional area of ​​the tank body decreases with increasing distance from the lid.

5. 5. The gear motor according to claim 1, wherein the oil tank overlaps with a terminal box of the motor when viewed in the axial direction of the motor.

6. An oil tank that communicates with a lubricating oil sealing space of a reducer of a gear motor having a reducer and a motor via a pipe outside the motor and the reducer, The oil tank has an opposing side surface facing an equipment side surface of at least one of the reducer or the motor, and an outer side surface facing the opposing side surface and positioned on the outside, The opposing side surface and the outer side surface are convex curved surfaces or flat surfaces in a direction away from the device-side side surface, and the opposing side surface is not a side surface formed along the same curvature as the device-side side surface, An oil tank for a gear motor, wherein the outer side surface has a shape that gradually becomes smaller in outer diameter from the motor toward the reducer.

7. A reduction gear unit including a reduction gear in which lubricating oil is sealed, and an oil tank communicating with a lubricating oil sealing space of the reduction gear via a pipe outside the reduction gear, The oil tank has an opposing side surface facing a predetermined side surface of the reducer and an outer side surface facing the opposing side surface and positioned outward, The opposing side surface and the outer side surface are convex curved surfaces or flat surfaces in a direction away from the predetermined side surface, and the opposing side surface is not a side surface formed along the same curvature with respect to the predetermined side surface, The reduction gear unit is characterized in that the outer side surface has a shape in which the outer shape gradually becomes smaller from the input side to the output side of the reduction gear.

8. The reduction gear unit according to claim 7, wherein the opposing side surface is a flat surface, and the outer side surface is a convex curved surface extending in a direction away from the predetermined side surface.

9. The oil tank has a tank body having the opposing side surface and the outer side surface, and a lid, The reduction gear unit according to claim 7 or 8, characterized in that the opposing side surface and the outer side surface are provided with mounting seats for mounting the lid, the mounting seats protruding in a direction approaching the predetermined side surface.

10. The reduction gear unit according to claim 9, wherein the cross-sectional area of ​​the tank body decreases with increasing distance from the lid side.

11. An oil tank that communicates with a lubricating oil sealing space of a reducer of a reducer unit having a reducer via a pipe outside the reducer, The oil tank has an opposing side surface facing a predetermined side surface of the reducer, and an outer side surface facing the opposing side surface and positioned outward, The opposing side surface and the outer side surface are convex curved surfaces or flat surfaces in a direction away from the predetermined side surface, and the opposing side surface is not a side surface formed along the same curvature with respect to the predetermined side surface, An oil tank for a reduction gear unit, wherein the outer side surface has a shape that gradually becomes smaller in outline from the input side to the output side of the reduction gear.

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