JP4906795B2 - Output hollow shaft reducer with oil absorption function - Google Patents

Description

  The present invention relates to an output hollow shaft type speed reducer integrated with a gear speed reduction mechanism used as a drive source for a transport device, an elevator, a lifting device, and the like, and more particularly, an output hollow shaft type speed reducer used in a narrow installation space. About.

2. Description of the Related Art Conventionally, as a motor used as a drive source for a conveyance device, an elevator, a lifting device, etc., a motor having a cylindrical output shaft with which a rotating shaft of a driven device is fitted, that is, a motor having an output hollow shaft is known. . As an example of such a motor, a gear provided with an output hollow shaft orthogonal to the rotation axis of the motor in order to rotate the driven shaft arranged on the left and right by one motor in synchronization and transmit a large torque to the driven shaft. A reduction gear in which a reduction mechanism (worm gear or the like) and a motor are integrated, that is, a so-called geared motor is widely used.
JP 2007-46653 A (refer to FIG. 3 in particular, pages 4 to 6)

  However, in the conventional speed reducer as described above, when the core of the driven machine shaft is greatly shaken, the oil seal that seals the output hollow shaft of the gear speed reduction mechanism is partially worn in a short period of time, or the oil seal lip A problem has been pointed out that the lubricant may be damaged and the lubricating oil may ooze out.

  Further, in the gear reduction mechanism as described above, when the output hollow shaft rotates, wear powder is generated by the meshing of the gears, and this wear powder is mixed into the lubricating oil. When the lubricating oil mixed with wear powder reaches the lip of the oil seal and the sliding portion of the output hollow shaft, the lip of the oil seal is worn. As a result, it has been pointed out that the sliding portion between the lip of the oil seal and the output hollow shaft is not properly lubricated with the lubricating oil, and the sealing function of the oil seal is lowered.

  Further, when the output hollow shaft rotates, the lubricating oil is agitated by the rotation of the gear, and the inside of the gear box incorporating the gear reduction mechanism becomes high pressure. This high pressure lubricating oil directly acts on the lip of the oil seal, causing the lip to deform, preventing proper contact between the lip of the oil seal and the output rotating shaft. It has been pointed out that the lubricant is not lubricated and the seal mechanism of the oil seal is lowered.

  If the lubricating oil oozes out as described above, the reduction gear cannot be easily removed from the driven shaft in places where the reduction gear installation space is small, and the output side bearing support that supports the oil seal is driven. It was also difficult to remove it from the axle. For that reason, leakage occurred when considering the impact on peripheral equipment and the environmental load, such as the braking force of the brake mechanism being reduced due to the leaked lubricant adhering to the brake friction surface and the control mechanism malfunctioning due to adhesion to the sensor. It was necessary to absorb and hold near the oil seal without splashing the lubricant.

  In short, there is an urgent need to take measures to absorb and hold leaked lubricating oil before it drops onto the installation surface of the reducer.

  Therefore, the technical problem to be solved by the present invention, that is, the object of the present invention is to install lubricating oil leaked from the oil seal portion of the speed reducer even when the speed reducer installation space is narrow. An object of the present invention is to provide an output hollow shaft type speed reducer having an oil absorbing function that absorbs and holds before dropping onto a surface and can be easily replaced.

  First, according to the first aspect of the present invention, a gear reduction mechanism is incorporated in a gear box and a lubricating oil that lubricates the gear reduction mechanism is enclosed, and an output hollow shaft that constitutes the gear reduction mechanism, the gear box, In the output hollow shaft type speed reducer that seals the lubricating oil leaking from the clearance of the output side by the oil seal supported by the output side bearing support, the oil content absorber that absorbs the leaked lubricating oil includes the output side bearing support. The output side bearing support has a mounting hole having a diameter shorter than the pitch of the mounting bolt screwed to the gear box and a diameter larger than the head of the mounting bolt, and the mounting bolt and the mounting hole are engaged with each other. The above-mentioned problem is solved by being installed at the outer periphery lower part.

  Further, the invention according to claim 2 is the output hollow shaft type speed reducer according to claim 1, wherein the oil absorber is made of an integrally formed body or a multilayer laminate having a convex cross section. It has been solved.

  The invention according to claim 3 is the output hollow shaft type speed reducer according to claim 2, wherein the oil absorber includes a long central sheet and a short front sheet and a rear sheet sandwiching the central sheet. The above-mentioned problems are further solved by comprising a multi-layer laminate in which the two are bonded except for the central part.

  According to the first aspect of the present invention, the gear reduction mechanism is built in the gear box, and the lubricating oil for lubricating the gear reduction mechanism is enclosed, and the output hollow shaft and the gear box constituting the gear reduction mechanism are In the output hollow shaft type reduction gear that seals the lubricating oil leaking from the gap with the oil seal supported by the output side bearing support, an oil absorber that absorbs the leaking lubricating oil is installed at the lower outer periphery of the output side bearing support. As a result, the leaked lubricating oil is absorbed and retained by the oil absorber before dripping onto the installation floor of the output hollow shaft speed reducer. Contamination to the installation environment of the speed reducer can be suppressed.

  The oil absorber has a mounting hole having a diameter shorter than the pitch of the mounting bolt for screwing the output side bearing support to the gear box and larger in diameter than the head of the mounting bolt, and the mounting bolt and the mounting hole are Because it is installed at the lower outer periphery of the output side bearing support by engaging, the oil absorber can be easily replaced even when the installation space of the output hollow shaft reducer is narrow, The maintenance burden on the hollow shaft speed reducer is significantly reduced.

  In addition, since the oil absorber absorbs and retains almost all of the leaked lubricant, it is easy to reuse the leaked lubricant, that is, it can be reused. it can. In addition, an oil absorber that absorbs oil to its fullest extent is very economical because the oil absorption capacity is restored again when the oil is squeezed out.

  In addition, according to the invention according to claim 2, the oil absorber is made of an integrally molded body or a multilayer laminate having a convex cross section, in synergy with the effect exhibited by the output hollow shaft speed reducer according to claim 1. As a result, the amount of oil absorbed by the oil absorber increases, so that the oil absorber replacement interval is prolonged and the maintenance burden is significantly reduced.

  Further, according to the invention of claim 3, synergistically with the effect produced by the output hollow shaft type speed reducer according to claim 2, the oil absorber absorbs the long central sheet and the height of the central sheet. By forming the multi-layer laminate in which the short front sheet and the rear sheet are bonded except for the central portion, each sheet can be manufactured only by punching, so that the workability of the oil absorber is greatly improved.

  Furthermore, since the rigidity of the oil absorber is increased by laminating the sheets, the oil absorber is lifted and undulation is suppressed, so that the adhesion to the output side bearing support is improved. In addition, by not adhering the central portion, the oil spreads smoothly from the central sheet to the front sheet and the rear sheet, thereby increasing the absorption capacity.

  The output hollow shaft type speed reducer according to the present invention includes a gear reduction mechanism built in the gear box and a lubricating oil that lubricates the gear reduction mechanism is enclosed, and a gap between the output hollow shaft and the gear box constituting the gear reduction mechanism. The oil leaking from the oil is sealed by an oil seal supported by the output side bearing support, and the oil absorber that absorbs the leaking lubricating oil is shorter than the pitch of the mounting bolts that screw the output side bearing support into the gear box. It has a configuration in which it is installed in the lower part of the outer periphery of the output side bearing support by having a mounting hole having a larger diameter than the head of the mounting bolt at an interval and engaging the mounting bolt and the mounting hole, Even if the installation space of the output hollow shaft reducer is small, the lubricating oil leaked from the oil seal part of the output hollow shaft reducer is reduced. As long as it has absorbed held and easily replaceable oil absorption feature before dropping to the installation surface of the machine, forms of the specific implementation, may any be any one.

  For example, the gear reduction mechanism of the present invention has no problem in the oil absorbing function regardless of whether it is an orthogonal worm gear, an orthogonal hypoid gear, or a spiral bevel gear. Even if the oil is a synthetic oil such as silicone or a vegetable oil such as castor oil, there is no problem in the oil absorption function.

  An embodiment of the present invention will be described below with reference to FIGS.

  Here, FIG. 1 is a front view of the output hollow shaft speed reducer of the present embodiment, FIG. 2 is a side view seen from the direction of arrow II in FIG. 1, and FIG. FIG. 4 is a cross-sectional view taken along line -III. FIG. 4 is a front view (bottom) and an exploded top view (top) of the oil absorber that is the main component of the present invention. FIG. FIG. 6 is an exploded perspective view of the oil absorber (upper) and an assembled perspective view (lower). FIG. 6 is an exploded side view of the exploded top view of FIG. These are the perspective views showing only the reduction gear of the output hollow shaft type reduction gear of a present Example.

  As shown in FIG. 1, the output hollow shaft speed reducer 100 of the present embodiment incorporates a gear reduction mechanism (not shown) in a gear box 120 and encloses lubricating oil for lubricating the gear reduction mechanism. The lubricating oil leaking from the gap between the output hollow shaft 130 and the gear box 120 constituting the gear reduction mechanism is sealed by the oil seal 140 supported by the output side bearing support 150. Gear box 120 and motor 190 are joined via a gear reduction mechanism so that the rotation axis of motor 190 and output hollow shaft 130 are perpendicular to each other.

  The output hollow shaft 130 is provided with a key groove 132 to enable a loose connection with a driven shaft (not shown). As shown in FIG. 3, the output hollow shaft 130 is pivotally mounted on the output side bearing support 150 by a rolling bearing 160.

  In this rolling bearing 160, the inner peripheral surface of the inner ring 162 is fixed to the outer peripheral surface of the output hollow shaft 130 and rotates together with the output hollow shaft 130. On the other hand, the outer peripheral surface of the outer ring 166 is fixed to the inner peripheral surface of a circular opening provided in the center of the output side bearing support 150. A rolling element 164 is fitted between the inner ring 162 and the outer ring 164, and the output hollow shaft 130 is supported by a rolling motion between the inner and outer rings 162 and 164 and the rolling element 164.

  An oil seal 140 that seals leakage of lubricating oil from the inside of the gear box 120 is supported by an output side bearing support 150 outside the rolling bearing 160. The oil seal 140 includes a lip 142, a dust guard 144, and a garter spring 146. The lip 142 is pressed against the outer peripheral surface of the output hollow shaft 130 by the tightening force of the garter spring 146. The sliding part between the outer peripheral surfaces maintains appropriate contact.

  Further, a thin plate-like filter 170 is mounted between the rolling bearing 160 and the oil seal 140 adjacent to the oil seal 140. This filter 170 filters the abrasion powder mixed in the lubricating oil stirred and scattered by the gear reduction mechanism built in the gear box 120. The material of the filter 170 may be a material that can filter fine particles such as wear powder and pass through the lubricating oil and has a shape retaining property that does not deform even when subjected to the pressure of the lubricating oil. It is preferable to use a non-woven fabric such as polyester or polyamide from the viewpoint that it can be manufactured at low cost by punching from a shaped material.

  An oil absorber 110 having a convex cross section that absorbs the lubricating oil leaked from the gap between the lip 142 and the output hollow shaft 130 is installed at the lower outer periphery of the output side bearing support 150. The oil absorber 110 is made of a sponge material such as polyurethane, and as shown in FIG. 1, an output of six mounting bolts 151 to 156 for screwing the output side bearing support 150 to the gear box 120. Mounting with a diameter slightly shorter than the pitch P of the lower two mounting bolts 151 and 152 arranged symmetrically with respect to the vertical line L passing through the center of the hollow shaft 130 and slightly larger than the head of the mounting bolt It has holes 112a and 112b (see FIGS. 4 and 5). The two mounting bolts 151 and 152 and the mounting holes 112a and 112b are engaged with each other in a stretched state due to the elasticity of the oil absorber 110, so that they are fixed to the lower outer periphery of the output side bearing support 150. As shown in FIGS. 1 to 3 and 7, the output-side bearing support 150 includes a circular and thin flange portion 150b having an insertion hole that is in close contact with the gear box 120 and through which the mounting bolts 151 to 156 are inserted. Between the hollow shaft 130, there is a circular thick wall portion 150a concentrically located inside the flange portion 150b in which the rolling bearing 160 and the oil seal 140 are interposed.

  As described above, the oil absorber 110 includes the head pitch P of the lower two mounting bolts 151 and 152 and the two mounting holes 112a and 112b among the heads of the six mounting bolts protruding from the flange portion 150b. It is fixed to the lower part of the outer periphery of the output-side bearing support 150 with sufficient strength only by the pulling force generated by the difference between the center sheet 112 and the output-side bearing support 150 as shown in FIGS. By adhering the double-sided adhesive tape 180 to the surface, the fixing strength is further increased, and the oil absorber 110 can be prevented from coming off due to vibration or the like, and the oil absorber 110 and the flange portion 150b of the output side bearing support 150 can be prevented. Since the adhesion is improved, absorption leakage of the leaked lubricating oil can be suppressed, and the effect is enormous.

  In this embodiment, as shown in FIG. 3, there is a gap S <b> 1 between the upper end surface of the oil content absorber 100 and the outer peripheral end surface of the thick portion 150 a of the output side bearing support 150, and the oil content absorber 100. There is a gap S2 between the upper surface of the convex shoulder located on the gear box 120 side and the outer peripheral end face of the flange portion 150b of the output side bearing support 150, so that these gaps S1 and S2 are eliminated. By forming the oil absorber 110 on the surface, the lubricating oil leaking from the gap between the output hollow shaft 130 and the oil seal 140 and dripping along the surface of the thick portion 150a (see the white arrow in FIG. 7) is completely absorbed. This is preferable because it can be performed.

  The oil absorber 110 can maximize the absorption amount of the lubricating oil with respect to the volume of the oil absorber 110 by being integrally formed. However, as shown in FIGS. The workability is drastically improved by punching out the sheet material having a long central sheet 112, the short front sheet 114 and the rear sheet 113 sandwiching the central sheet 112, and then bonding them together with an adhesive. At this time, if an adhesive is applied to the entire surface of the front sheet 114 and the rear sheet 113 and adhered to the central sheet 112, the lubricating oil soaked into the central sheet 112 will not easily penetrate into the front sheet 114 and the rear sheet 113. In the central part of the front sheet 114 and the rear sheet 113, a non-adhesive surface to which no adhesive is applied is provided. The upper end surface of the center seat 112 has an arc having the same radius as the outer peripheral radius of the thick portion 150 a of the output side bearing support 150, and the front seat 114 and the rear seat 113 have a flange portion 150 b of the output side bearing support 150. It has an arc with the same radius as the outer peripheral radius.

  According to the output hollow shaft type speed reducer according to the present invention, the oil absorber is attached to the lower part of the outer periphery of the output side bearing support using the existing mounting bolts for screwing the output side bearing support to the gear box. The oil absorber can be attached to the mold speed reducer without any additional processing, and the replacement can be easily performed even in a narrow space without requiring tools. Further, the technical idea of the present invention is applied not only to the output hollow shaft type reduction gear but also to various other devices having a rotating shaft such as an output solid shaft type reduction gear or a motor and using lubricating oil. And its industrial applicability is enormous.

The front view of the output hollow shaft type reduction gear of a present Example. The side view seen from the arrow II direction of FIG. Sectional drawing in the III-III line of FIG. The front view of the oil-absorbing body which is a main structural member of a present Example, and its exploded top view. FIG. 5 is an exploded perspective view of the oil absorber shown in FIG. 4 and an assembled perspective view. The exploded side view when the exploded top view of FIG. 4 is seen from the arrow VI direction. The perspective view showing only the reduction gear of the output hollow shaft type reduction gear of this example.

100 ... Output hollow shaft type speed reducer 110 ... Oil absorber 112 ... Center sheet 112a, 112b (of oil absorber) ... Mounting hole 113 (of oil absorber) ... (Oil absorption) Rear sheet 114 of the body ... Front sheet 120 of the oil absorber ... Gear box 130 ... Hollow output shaft 132 ... Key groove 140 ... Oil seal 142 ... (of oil seal) ) Lip 144 ... Dust cover 142 (of oil seal) ... Garter spring 150 (of oil seal) ... Output side bearing support 150a ... Thick part 150b (of output side bearing support)・ Flange portions 151 to 156 (of the output side bearing support)... Mounting bolt 160... Rolling bearing 162... Inner ring 164 (of the rolling bearing). Rolling wheel 166 (for rolling bearing) ... Outer ring 170 (for rolling bearing) ... Filter 180 ... Double-sided adhesive tape 190 ... Motor

Claims (3)

A gear reduction mechanism is built in the gear box, and lubricating oil for lubricating the gear reduction mechanism is enclosed, and the lubricating oil leaking from the gap between the output hollow shaft constituting the gear reduction mechanism and the gear box is output on the output side. In the output hollow shaft reducer that seals with the oil seal supported by the bearing support,
The oil absorber that absorbs the leaked lubricating oil has a mounting hole having a diameter that is shorter than the pitch of the mounting bolt for screwing the output side bearing support to the gear box and larger in diameter than the head of the mounting bolt. In addition, the output hollow shaft type speed reducer is installed at an outer peripheral lower portion of the output side bearing support by engaging the mounting bolt and the mounting hole.   2. The output hollow shaft speed reducer according to claim 1, wherein the oil absorber comprises an integrally molded body or a multilayer laminated body having a convex cross section.   3. The output according to claim 2, wherein the oil absorber comprises a multi-layer laminate in which a long central sheet and a short front sheet and a rear sheet sandwiching the central sheet are bonded together except for the central portion. Hollow shaft reducer.

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