JP2015040570A - Foreign substance attracting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a foreign substance attracting structure capable of efficiently capturing a foreign substance in lubricating oil.SOLUTION: In a structure for attracting a foreign substance 109 in lubricating oil 103 by an attracting body 20, the attracting body 20 includes a magnet 21 and a capturing body 61 constituted by a feeble magnetic material. The capturing body 61 is arranged in a position magnetized by magnetic force of the magnet 21. A range occupied by the attracting body 20 can be made wider by the capturing body 61, and the foreign substance 109 in the wide region can be efficiently attracted by the capturing body 61 magnetized by the magnet 21. Further, the capturing body 61 is constituted by the feeble magnetic material, and therefore, the capturing body 61 loses magnetic force by separating a distance between the capturing body 61 and the magnet 21, and the foreign substance 109 attracted by the capturing body 61 can be easily removed.

Description

  The present invention relates to a foreign matter adsorption structure for adsorbing foreign matter in lubricating oil used in a gear device or the like by an adsorbent.

  In a gear device such as a speed reducer, lubrication and cooling of the gears and the like are necessary to prevent damage to the gears and bearings accompanying the operation of the gears. For this reason, a method of storing lubricating oil in the casing and splashing the lubricating oil on the bearing by rotation of the gear, and a method of supplying the lubricating oil to the gear and the bearing by a pump are known (see Patent Document 1).

JP 2000-266168 A

  In the gear device, foreign matter such as iron powder is generated due to gear wear or the like. The foreign matter is mixed with the lubricating oil and diffuses to the gears and bearings, and a part of them adheres to them. This is caught in the gear or the bearing and damages the gear or the bearing, or becomes a resistance of the bearing, and therefore needs to be captured and removed.

  This invention is made | formed in view of such a condition, The objective is to provide the foreign material adsorption | suction structure which can capture | acquire the foreign material in lubricating oil effectively.

  One embodiment of the present invention relates to a foreign matter adsorption structure. The foreign matter adsorbing structure is a structure for adsorbing foreign matter in lubricating oil by an adsorbent, and the adsorbent has a magnet and a capturing body made of a weak magnetic material, and the capturing body is a magnet. It is arrange | positioned in the position magnetized by the magnetic force of.

  According to the foreign matter adsorbing structure of an aspect of the present invention, the range occupied by the adsorbing body is widened by the capturing body, so that a wide range of foreign matter can be effectively adsorbed by the capturing body magnetized by the magnet. In addition, since the capturing body is made of a weak magnetic material, if the distance between the capturing body and the magnet is increased, the capturing body loses the magnetic force, and the foreign matter adsorbed on the capturing body can be easily removed.

It is front sectional drawing which shows the gear apparatus which concerns on 1st Embodiment. It is a fragmentary sectional front view which shows the foreign material adsorption structure which concerns on 1st Embodiment. It is a block diagram which shows the gear apparatus which concerns on 2nd Embodiment. (A) is a plane sectional view showing a foreign substance adsorption structure concerning a 2nd embodiment, and (b) is the side sectional view. It is side surface sectional drawing which shows the foreign material adsorption structure which concerns on 3rd Embodiment. It is front sectional drawing which shows the gear apparatus which concerns on 4th Embodiment. It is a partial side sectional view showing the gear device concerning a 4th embodiment. It is a fragmentary sectional view which shows the foreign material adsorption structure which concerns on 5th Embodiment. It is front sectional drawing which shows the foreign material adsorption structure which concerns on 6th Embodiment. It is a partially exploded perspective view which shows the foreign material adsorption structure which concerns on 6th Embodiment. It is front sectional drawing which shows the foreign material adsorption structure which concerns on 7th Embodiment.

[First Embodiment]
1 and 2 show a configuration of a foreign matter adsorbing structure 10 according to the first embodiment. The foreign matter adsorption structure 10 includes a gear device 100, an adsorbent 20, and a support member 80.

  The gear device 100 is a parallel shaft gear reducer. As shown in FIG. 1, the gear device 100 includes a casing 101 and a plurality of gears 121 a to 121 f (hereinafter collectively referred to as a gear 121).

  A storage chamber 105 is provided in the casing 101 as a space for storing the lubricating oil 103. In the casing 101, a plurality of shafts 107a to 107d (hereinafter collectively referred to as the shaft 107) are provided substantially in parallel. The shaft 107 includes an input shaft 107a, a first gear shaft 107b, a second gear shaft 107c, and an output shaft 107d. Each shaft 107 is rotatably supported by the casing 101 via a bearing (not shown). The casing 101 is provided with an inspection port 111 for inspecting the inside. The inspection port 111 is opened and closed by a lid member 113. The lid member 113 is detachably attached to the casing 101 with screws or the like.

  The gear 121 is accommodated in the casing 101. The plurality of gears 121 include an input gear 121a, a first large diameter gear 121b, a first small diameter gear 121c, a second large diameter gear 121d, a second small diameter gear 121e, and an output gear 121f. The input gear 121a is fixed to the input shaft 107a, and the first large diameter gear 121b and the first small diameter gear 121c are fixed to the first gear shaft 107b. The second large diameter gear 121d and the second small diameter gear 121e are fixed to the second gear shaft 107c, and the output gear 121f is fixed to the output shaft 107d. Each gear 121 is provided by being partially immersed in the lubricating oil 103.

  The input shaft 107a is connected to a motor (not shown). When the input shaft 107a rotates by driving the motor, the rotation is decelerated by the plurality of gears 121 and transmitted to the output shaft 107d. The rotation of the gear 121 supplies the lubricating oil 103 to the gear 121, the shaft 107, and the bearing. In the lubricating oil 103, foreign matter 109 such as metal powder such as iron powder or metal debris generated by wear of the gear 121 or the like is mixed.

  The adsorbent 20 is disposed in the lubricating oil 103 apart from the inner bottom surface 101 a of the casing 101 that forms a part of the storage chamber 105. As shown in FIG. 2, the attracting body 20 includes a magnet 21, a nonmagnetic cover 41, and a capturing body 61. The magnet 21 is a ferrite magnet, but may be a permanent magnet such as a neodymium magnet or an electromagnet. The magnet 21 is formed in a columnar shape in the illustrated example, but the shape is not limited. The magnet 21 has an S pole on one end side in the longitudinal direction and an N pole on the other end side. The magnet 21 is supported by the support member 80 with the longitudinal direction thereof being substantially horizontal.

  The nonmagnetic cover 41 is made of a nonmagnetic material using a film-like soft material such as a plastic film. The nonmagnetic cover 41 is formed in a bag shape with an opening 43 provided in the upper part thereof. In the nonmagnetic cover 41, the magnet 21 is disposed on the bottom side, and the support member 80 is disposed on the opening 43 side. The nonmagnetic cover 41 covers the entire outer surface of the magnet 21 and covers the lower end portion of a connecting portion 83 (described later) of the support member 80. The non-magnetic cover 41 prevents the magnet 21 from being exposed to the lubricating oil 103 when the adsorbent 20 is disposed in the lubricating oil 103, and prevents the foreign matter 109 in the lubricating oil 103 from being attracted to the magnet 21.

  The nonmagnetic cover 41 is tightly attached to the magnet 21 and the connecting portion 83 by, for example, twisting around the connecting portion 83 of the support member 80, and the string-like members 45 are placed at a plurality of positions spaced above and below the connecting portion 83. It is wound and fixed to the magnet 21. Even if the foreign matter 109 in the lubricating oil 103 enters from the opening 43 of the nonmagnetic cover 41 by winding the string-like member 45, the entry of the foreign matter 109 from the winding position to the bottom side is suppressed, and the magnet 21 of the foreign matter 109 is suppressed. Adsorption is prevented. The magnet 21 of the attracting body 20 can be taken in and out from the opening 43 of the nonmagnetic cover 41 by removing the string-like member 45. The string-like member 45 is made of a weak magnetic material such as a soft iron wire. The string member 45 may be made of a nonmagnetic material such as synthetic fiber. Further, the nonmagnetic cover 41 may be made of a stretchable nonmagnetic material so that the magnet 21 can be easily inserted and removed from the opening 43 while improving the adhesion to the magnet 21 and the like.

  The capturing body 61 is disposed outside the magnet 21 and the nonmagnetic cover 41. In the example shown in the figure, one capturing body 61 is disposed on each side in the longitudinal direction of the columnar magnet 21. The capturing body 61 is configured by deforming, for example, by rolling a wire made of a weak magnetic material such as a soft iron wire, and collecting it in a cotton shape. That is, the capturing body 61 is constituted by an assembly of weak magnetic material wires. Since the capturing body 61 is composed of an assembly of wire rods, the lubricating oil 103 is configured to pass therethrough. The weak magnetic material includes a paramagnetic material such as soft iron.

  Inside the capturing body 61, the longitudinal end of the magnet 21 is pushed together with the nonmagnetic cover 41, and the magnet 21 and a part of the nonmagnetic cover 41 are covered with the capturing body 61. The position with respect to the magnet 21, the thickness of the nonmagnetic cover 41, and the like are adjusted so that the capturing body 61 is disposed at a position where it is magnetized by the magnetic force of the magnet 21. Since the capturing body 61 is made of a paramagnetic material, it is magnetized by the magnetic force of the magnet 21 and is attracted and fixed to the magnet 21. At this time, the capturing body 61 is fixed to the outside of the magnet 21 with the nonmagnetic cover 41 interposed therebetween. Since the capturing body 61 is magnetized by the magnet 21, a part of the foreign matter 109 in the lubricating oil 103 passing through the vicinity or the inside of the capturing body 61 is adsorbed. In order to firmly fix the capturing body 61 to the magnet 21, the capturing body 61 may be wound around the magnet 21 with a string member made of weak magnetic material or nonmagnetic material.

  Returning to FIG. 1, the support member 80 includes a fixing portion 81, a rod-like connection portion 83, and an attachment portion 85. The support member 80 is made of a nonmagnetic material using a hard material such as plastic.

  The fixing portion 81 is provided on the upper end side, which is one end side of the connecting portion 83, and includes a plate-like member 82. The plate-like member 82 is detachably fixed to the back surface of the lid member 113 provided outside the lubricating oil 103 with a screw or the like.

  As shown in FIG. 2, the attachment portion 85 is provided on the lower end side, which is the other end side of the connecting portion 83, and is configured by a male screw. A female screw hole is formed in the magnet 21. The attachment portion 85 is screwed into the female screw hole of the magnet 21. That is, the adsorbent 20 is detachably attached to the attachment portion 85. The magnet 21 may be provided with a male screw, the attachment portion 85 may be provided with a female screw hole, and the male screw of the magnet 21 may be screwed into the female screw hole of the attachment portion 85.

  When the adsorbent 20 is attached to the attachment portion 85, it is supported by the support member 80 and positioned in the lubricating oil 103. If the operator removes the screw or the like of the lid member 113 and the operator grips the lid member 113 from the casing 101, the adsorbent 20 can be taken out from the lubricating oil 103 to the outside of the casing 101.

  Returning to FIG. 1, a plate-like rib 87 is provided at a connection portion between the connecting portion 83 and the fixing portion 81, and the connection portion is highly rigid. When the lubricating oil 103 is caused to flow by the operation of the gear 121 and a force for displacing the adsorbent 20 on the free end side of the support member 80 is applied, the connecting portion 83 and the fixed portion on the fixed end side of the support member 80 The rib 87 can resist the bending force acting on the 81 connection points. Note that the rib 87 may not be provided.

  The effect of the foreign material adsorption structure 10 according to the first embodiment will be described. A part of the foreign matter 109 mixed in the lubricating oil 103 is carried to the vicinity of the adsorbent 20 when a flow occurs in the lubricating oil 103 due to the operation of the plurality of gears 121 or the like. A part of the foreign matter 109 is adsorbed on the surface of the nonmagnetic cover 41 or is adsorbed and captured on the outer surface or inside of the capturing body 61.

  According to the foreign matter adsorbing structure 10, the range occupied by the adsorbing body 20 is widened by the capturing body 61, so that the wide range of foreign matter 109 can be effectively adsorbed by the capturing body 61 magnetized by the magnet 21. In particular, since the lubricating oil 103 is configured to pass through the inside of the capturing body 61, the amount of foreign matter 109 adsorbed by the capturing body 61 is increased. Since the foreign material adsorbing structure 10 that can effectively adsorb the foreign material 109 is used in the gear device 100, the removal rate of the foreign material 109 in the gear device 100 is increased, and the life reduction of the gear 121 and the bearing can be improved. Further, since the capturing body 61 is made of a weak magnetic material, the capturing body 61 loses its magnetic force when the distance between the capturing body 61 and the magnet 21 is increased by taking out the magnet 21 from the nonmagnetic cover 41 or the like. The foreign matter 109 adsorbed on 61 can be easily removed. The foreign matter 109 can be removed by wiping, shaking, sucking, washing with water, etc. the surface of the capturing body 61. Further, since the foreign matter 109 is attracted to the capturing body 61 and the nonmagnetic cover 41 based on the magnetic force of the magnet 21, the fine foreign matter 109 that is difficult to be captured by the filter can be captured.

  Further, since the nonmagnetic cover 41 covers the magnet 21, the foreign substance 109 is prevented from being attracted to the magnet 21 while the foreign substance 109 is captured by the capturing body 61 and the nonmagnetic cover 41. If the magnet 21 is taken out from the nonmagnetic cover 41, the magnetic force does not act on the foreign matter 109 adsorbed on the nonmagnetic cover 41, and the foreign matter 109 can be easily removed. Therefore, the foreign substance 109 adsorbed by the capturing body 61 and the nonmagnetic cover 41 can be easily removed while suppressing the adsorption of the foreign substance 109 to the magnet 21.

  In addition, since the fixing portion 81 of the support member 80 is fixed outside the lubricating oil 103, the operator can grasp the fixing portion 81 and take out the adsorbent 20 without putting his hands in the lubricating oil 103. In particular, since the fixing portion 81 is fixed to the lid member 113, the adsorbent 20 can be taken out of the casing 101 when the lid member 113 is removed. I can confirm.

[Second Embodiment]
3 and 4 show the configuration of the foreign matter adsorption structure 10 according to the second embodiment. In addition, in FIG.4 (b), in order to demonstrate easily, some capture bodies 61 are abbreviate | omitted. In the following embodiments, the same elements as those described in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

  The foreign matter adsorption structure 10 further includes a lubricating oil passage 130 through which the lubricating oil 103 flows. In the illustrated example, the lubricating oil passage 130 is configured as a circulation passage for dry sump. In the middle of the lubricating oil passage 130, a suction passage 131, an oil tank 133, and a discharge passage 135 are provided in this order. In the middle of the suction path 131, a pump 137 and the foreign matter adsorption structure 10 are installed in this order. When the pump 137 is driven, the lubricating oil passage 130 is forcibly transferred to the lubricating oil passage 130. The lubricating oil 103 is sucked from the storage chamber 105 in the casing 101 and discharged to the storage chamber 105 through the suction path 131, the oil tank 133, and the discharge path 135. The oil tank 133 is provided separately from the storage chamber 105 of the casing 101 in order to store the lubricating oil 103.

  As shown in FIG. 4, the foreign matter adsorbing structure 10 does not include the support member 80 described in the first embodiment. The magnet 21 is disposed in the lubricating oil passage 130 with its longitudinal direction being substantially parallel to the flow direction P of the lubricating oil passage 130.

  The nonmagnetic cover 41 is formed in a bag shape with an opening 43 provided in the upper part thereof. The nonmagnetic cover 41 has the magnet 21 disposed on the bottom side thereof and covers the entire outer surface of the magnet 21. The nonmagnetic cover 41 is fixed to the magnet 21 by wrapping a string-like member 45 around the top thereof.

  The capturing body 61 is composed of an aggregate of wire rods that are deformed by rounding a wire material of weak magnetic material and arranged so as to cover the entire magnet 21 and the nonmagnetic cover 41.

  The lubricating oil passage 130 is provided on the upstream side in the flow direction P of the large-diameter portion 143, the large-diameter portion 143 provided on the upstream side in the flow direction P of the small-diameter portion 141 on the output side. And an entrance-side small diameter portion 145. The large-diameter portion 143 has a flow passage inner diameter L2 larger than the flow passage inner diameter L1 of the exit-side small-diameter portion 141 and the entry-side small-diameter portion 145. The adsorbent 20 is disposed in the large diameter portion 143. Even if the adsorbent 20 moves downstream due to the flow of the lubricating oil 103, the adsorbent 20 is engaged with the stepped portion 147 between the outlet small diameter portion 141 and the large diameter portion 143, and the position is maintained.

  The adsorbent 20 is configured such that the radial maximum length L3 of the portion including the magnet 21 and the nonmagnetic cover 41 is smaller than the flow path inner diameter L1 of the outlet side small diameter portion 141 and the inlet side small diameter portion 145. Since the capturing body 61 constituted by the aggregate of wire rods is elastically deformed, the adsorbing body 20 is pushed into the large diameter section 143 from the exiting small diameter section 141 or the entrance small diameter section 145, and the adsorbing body 20 is placed inside the large diameter section 143. Can be placed.

  According to the second embodiment described above, since the adsorbing body 20 is disposed in the lubricating oil flow path 130, the foreign matter 109 can be adsorbed and captured by the nonmagnetic cover 41 and the capturing body 61, and the lubricating oil flow path 130. The adsorbent 20 can be used as a strainer that captures the foreign matter 109 in the lubricating oil 103 flowing through the. In particular, since the adsorbent 20 configured to allow the lubricating oil 103 to pass therethrough is used, the foreign matter 109 can be effectively captured without significantly impeding the flow of the lubricating oil 103.

  Further, when the adsorbent 20 is used in the gear device 100, the adsorbent 20 is installed in the lubricating oil flow path 130 away from the storage chamber 105, so that the operation of the gear 121 and the like in the storage chamber 105 is caused by the magnetic force of the magnet 21. Is not hindered. Therefore, the magnet 21 having a large attractive force can be used, and the amount of foreign matter 109 attracted can be increased.

  In order to hold the position of the adsorbent 20 in the lubricating oil flow path 130, the lubricating oil flow path 130 is provided with a large diameter portion 143 and is adsorbed by a stepped portion 147 between the outlet small diameter portion 141 and the large diameter portion 143. Although the body 20 is engaged, the means for holding the position is not limited to this. For example, the lubricating oil flow path 130 may be provided with a protrusion on its inner surface, and the capturing body 61 of the adsorbent body 20 and the like may be engaged with the protrusion to hold the position.

  As a modification, the adsorbent 20 may be disposed in the oil tank 133. Rather than arranging the adsorbent 20 in the suction path 131 and the discharge path 135, the size of the adsorbent 20 can be increased and the amount of adsorption of the foreign matter 109 can be increased. Further, the lubricating oil flow path 130 may be provided in the casing 101 separately from the storage chamber 105. Further, in order to increase the amount of adsorption of the foreign matter 109, the adsorbent 20 may be provided so as to cross a cross section orthogonal to the flow direction P of the lubricating oil passage 130.

  As a modification, the foreign matter adsorption structure 10 may be installed on the upstream side of the suction path 131 instead of the downstream side of the pump 137. Further, the foreign matter adsorption structure 10 may be installed in the discharge path 135. Further, the oil tank 133 may not be provided in the lubricating oil flow path 130.

[Third Embodiment]
FIG. 5 shows a configuration of the foreign matter adsorption structure 10 according to the third embodiment. The foreign matter adsorbing structure 10 includes an introduction pipe 171 (first flow path member), a relay pipe 172 (second flow path member) arranged in order from the upstream side to the downstream side in the flow direction P of the lubricating oil flow path 130, A lead-out tube 173.

  The introduction pipe 171, the relay pipe 172, and the outlet pipe 173 are each formed with a part of the lubricating oil flow path 130. Each pipe 171 to 173 is provided with a flange portion 175 at the end portion in the flow direction P thereof. The pipes 171 to 173 are detachably connected by bolts 177 passing through the flange portions 175 after the flange portions 175 are brought into contact with each other and brought into surface contact with each other. The introduction pipe 171 is detachably connected to the relay pipe 172 from the upstream side in the flow direction P.

  The relay pipe 172 includes an exit-side small-diameter portion 141 and a large-diameter portion 143 provided on the upstream side in the flow direction P of the exit-side small-diameter portion 141, and the adsorbent 20 is disposed in the large-diameter portion 143. Is done. The adsorbent 20 is configured such that the radial maximum length L3 of the portion including the magnet 21 and the nonmagnetic cover 41 is larger than the flow path inner diameter L1 of the outlet side small diameter portion 141. Thereby, even if it moves to the downstream side due to the flow of the lubricating oil 103, it is firmly engaged with the step portion 147 between the outlet side small diameter portion 141 and the large diameter portion 143, and the position is easily maintained.

  The adsorbent 20 is configured such that the overall radial maximum length L4 is smaller than the flow path inner diameter L2 of the large diameter portion 143. When the relay pipe 172 is removed from the introduction pipe 171, the adsorbent 20 can be easily taken out from the upstream opening in the flow direction P of the relay pipe 172.

  According to the above third embodiment, when the relay pipe 172 is removed from the introduction pipe 171, the adsorbent 20 can be taken out from the relay pipe 172 to the outside. Therefore, even when the adsorbing body 20 is arranged in the lubricating oil flow path 130, the adsorbing body 20 can be easily taken out and the workability during maintenance is improved. Further, since the outlet side small diameter portion 141 and the large diameter portion 143 are formed in the relay pipe 172, the position of the adsorbing body 20 can be maintained regardless of the flow path inner diameter of the outlet pipe 173 connected to the relay pipe 172. .

  The relay pipe 172 will be described as a first flow path member in which the outlet side small diameter part 141 and the large diameter part 143 are formed, and is connected to the introduction pipe 171 in a detachable manner. The introduction pipe 171 has been described as a second flow path member having a portion formed therein. However, the first flow path member and the second flow path member are not limited to the tubular body. In addition, the relay pipe 172 does not have to have the outlet small diameter portion 141 formed therein, and the outlet pipe 173 may have a portion corresponding to the outlet small diameter portion 141. Further, inside the relay pipe 172, the outlet side small diameter portion 141 is not provided on the downstream side of the large diameter portion 143, but the inlet side small diameter portion 145 is provided on the upstream side, and the adsorbent 20 is taken out from the downstream side. You may comprise. When the outlet side small diameter portion 141 or the inlet side small diameter portion 145 is provided in the relay pipe 172, the adsorbent 20 in the large diameter portion 143 of the relay pipe 172 is connected to the outlet side small diameter portion when the relay pipe 172 is connected to the introduction pipe 171 or the like. 141 or the entry-side small diameter portion 145 is prevented from coming out and workability is improved.

[Fourth Embodiment]
6 and 7 show a foreign matter adsorbing structure 10 according to the fourth embodiment. The gear device 100 is an orthogonal shaft gear reducer, unlike the first embodiment. In the gear device 100, a first bevel gear 121g fixed to the input shaft 107a meshes with a second bevel gear 121h fixed to the intermediate shaft 107e. Hereinafter, a direction parallel to the intermediate shaft 107e is referred to as an X direction.

  The connecting portion 83 of the support member 80 can be connected to a plurality of locations of the fixed portion 81. That is, the fixed portion 81 has a plurality of attached portions for connecting the connecting portions 83 of the support member 80. By changing the connection location of the support member 80, the adsorbent 20 can be installed at a plurality of positions A <b> 1 and A <b> 2 in the casing 101. In FIG. 6, the first position A1 that is one position where the adsorbent 20 can be installed is indicated by a solid line, and the second position A2 that is another position is indicated by a two-dot chain line. The adsorbent 20 is located closer to the X direction from the input shaft 107a when installed at the first position A1, and is located closer to the other side of the X direction from the input shaft 107a when installed at the second position A2. .

  When a flow occurs in the lubricating oil 103 due to the rotation of the first bevel gear 121g and the second bevel gear 121h, a large amount of foreign matter collects in a part of the storage chamber 105 according to the rotation direction of the first bevel gear 121g. The first position A1 where the adsorbent 20 is installed is provided at a position where a large amount of foreign matter 109 gathers when the first bevel gear 121g rotates in the forward direction P1. On the other hand, the second position A2 is provided at a position where a large amount of foreign matter 109 gathers when the first bevel gear 121g rotates in the reverse direction. The adsorbent 20 knows in advance the rotational direction of the first bevel gear 121g and is arranged at a position where a large number of foreign substances 109 gather from a plurality of positions A1 and A2.

  According to the fourth embodiment, the adsorption body 20 can be installed by selecting from a plurality of positions. Therefore, if the installation position of the adsorption body 20 is changed according to the rotation direction of the first bevel gear 121g, the foreign matter 109 is effective. Can be adsorbed. In addition, you may install the some adsorption body 20 in both position A1 and position A2.

[Fifth Embodiment]
FIG. 8 shows a configuration of the foreign matter adsorption structure 10 according to the fifth embodiment. The casing 101 of the gear device 100 further includes a drain portion 151 and a drain plug 161. The drain part 151 is provided for discharging the lubricating oil 103 in the casing 101.

  The drain plug 161 is made of a weak magnetic material such as soft iron. The drain plug 161 has a screw portion 163 that is screwed into a female screw hole formed in the drain portion 151. That is, the drain plug 161 is detachably attached to the drain portion 151. The drain plug 161 has a through hole 165 formed at the center thereof. A mounting portion 167 for detachably mounting the nonmagnetic cover 41 is provided at the end portion on the casing 101 side which is one end portion of the through hole 165.

  The attracting body 20 includes a magnet 21, a nonmagnetic cover 41, and a capturing body 61. The nonmagnetic cover 41 is made of a nonmagnetic material using a hard material such as plastic. The nonmagnetic cover 41 includes a mounted portion 41 a that is mounted on the mounting portion 167 of the drain plug 161 and a magnet storage portion 41 c that stores the magnet 21.

  The nonmagnetic cover 41 is formed in a bottomed cylindrical shape, and a mounted portion 41a is provided on one end side that is the inlet side, and a magnet housing portion 41c is provided on the other end side that is the bottom side. When the mounted portion 41 a is mounted on the mounting portion 167 of the drain plug 161, the magnet storage portion 41 c is disposed in the lubricating oil 103. The attached portion 41 a of the nonmagnetic cover 41 is attached to the attachment portion 167 of the drain plug 161, and the adsorbent 20 is fixed to the drain plug 161.

  The nonmagnetic cover 41 can insert and remove the magnet 21 from the entrance of the mounted portion 41a to the magnet storage portion 41c. The inlet of the mounted portion 41a is closed by a lid member 113 that is screwed into a female screw hole formed inside the mounted portion 41a. That is, the lid member 113 is detachably fixed inside the mounted portion 41a. The method of fixing the lid member 113 and the mounted portion 41a is not limited to screws, and may be fixed using, for example, bolts. The adsorber 20 can remove and insert the magnet 21 from the nonmagnetic cover 41 by removing the lid member 113.

  The capturing body 61 is configured by collecting the weak magnetic material wires into a cotton shape. Inside the capturing body 61, the magnet storage part 41c of the nonmagnetic cover 41 is pushed. The capturing body 61 is disposed so as to cover the magnet storage portion 41 c of the nonmagnetic cover 41 and the magnet 21 inside thereof. The capturing body 61 is magnetized by the magnetic force of the magnet 21, attracted to the magnet 21, and fixed with the nonmagnetic cover 41 interposed therebetween.

  According to the fifth embodiment, when the drain plug 161 is removed from the casing 101, the adsorbent 20 can be taken out, and when the lubricating oil 103 is discharged from the casing 101, the adsorbing state of the foreign matter 109 on the adsorbent 20 is confirmed. it can. Further, if the lid member 113 is also removed when the drain plug 161 is removed from the casing 101, and the magnet 21 is taken out from the magnet housing part 41c, the foreign matter attached to the outer peripheral surface of the magnet housing part 41c, which is a part of the nonmagnetic cover 41. 109 can be easily removed.

[Sixth Embodiment]
9 and 10 show an adsorbent 20 according to a sixth embodiment. The adsorbent 20 is placed and disposed on the inner bottom surface 101 a of the casing 101.

  The capturing body 61 is configured in a net shape in which a wire of a weak magnetic material such as soft iron is entangled. That is, the capturing body 61 is constituted by an assembly of weak magnetic material wires. A plurality of capturing bodies 61 are arranged in parallel in the thickness direction. In FIG. 10, only the capturing bodies 61 on both end sides in the thickness direction among the plurality of capturing bodies 61 are illustrated in order to simplify the description. The plurality of capturing bodies 61 are formed with through-holes 63 into which the magnets 21 and the nonmagnetic cover 41 are inserted at intermediate portions thereof. Since the capturing body 61 is made of a paramagnetic material, it is magnetized by the magnet 21 and is attracted to the magnet 21 and fixed. In order to firmly fix the plurality of net-like capturing bodies 61, a string-like member may be wound around them.

[Seventh Embodiment]
FIG. 11 shows an adsorbent 20 according to a seventh embodiment. The nonmagnetic cover 41 is made of a nonmagnetic material using a hard material such as plastic. The non-magnetic cover 41 is configured by connecting a pair of bottomed cylindrical split members 49 and covers the entire outer surface of the magnet 21. The magnet 21 is taken in and out from the opening of the dividing member 49. The pair of split members 49 are provided with a male screw portion 49a at the opening end of one split member 49, a female screw portion 49b at the open end of the other split member 49, and the male screw portion 49a with the female screw portion 49b. It is screwed into and detachably connected. If the other divided member 49 is removed from one divided member 49, the magnet 21 can be taken in and out of the divided member 49 constituting the nonmagnetic cover 41.

  The capturing body 61 is constituted by a plate-shaped member made of weak magnetic material in which a plurality of through holes 65 are formed. The capturing body 61 is configured such that the lubricating oil 103 can pass through the through hole 65. The capturing body 61 has a screw hole 67 formed in the center thereof, and the split member 49 has a male screw portion 49c formed on the outer peripheral surface thereof. The capturing body 61 is detachably connected by screwing the male screw portion 49 c of the dividing member 49 into the screw hole 67. A plurality of the capturing bodies 61 are arranged outside the magnet 21 with an interval in the longitudinal direction of the magnet 21. Note that the through hole 65 may not be formed.

  As in the sixth embodiment described above, the capturing body 61 includes an assembly of wire materials configured in a cotton shape, a net shape, or the like. Further, as in the seventh embodiment, the capturing body 61 includes a plate-like member in addition to the aggregate of wire rods, and may include a tubular member or the like in addition to this.

  As mentioned above, although this invention was demonstrated based on embodiment, embodiment only shows the principle and application of this invention. In the embodiment, many modifications and arrangements can be made without departing from the spirit of the present invention defined in the claims.

  In the above-described embodiment, the example in which the foreign matter adsorption structure 10 is used in the gear device 100 including a plurality of gears has been described. However, the foreign matter adsorbing structure 10 may also be used for an internal combustion engine such as an engine or an air conditioner such as a compressor as long as it is a device including mechanical parts that generate friction such as pistons, cylinders, and bearings. Good. Further, although the parallel shaft gear reducer and the orthogonal shaft gear reducer have been described as the gear device 100, the type of the reduction mechanism is not particularly limited as long as there is a gear in the casing 101. For example, a differential gear mechanism may be used. .

  In addition to being installed in the lubricating oil 103, the adsorbent 20 should be lubricated in a predetermined manner, such as on a lubricating oil passage provided on the surface of the lubricating oil 103, or on a splashed portion of the lubricating oil splashed by a gear. It may be installed at a location. The adsorbent 20 may not include the nonmagnetic cover 41. Further, the adsorbent 20 may be installed at a plurality of locations as predetermined locations to be lubricated.

  The adsorbent 20 is not particularly limited with respect to a structure in which the magnet 21 is taken in and out of the nonmagnetic cover 41. For example, after putting the magnet 21 in the non-magnetic cover 41 divided into a plurality, the divided parts may be joined by heat welding or the like, and the non-magnetic cover 41 may be cut when the magnet 21 is taken out. Further, the nonmagnetic cover 41 may be provided with unevenness on the surface thereof to increase the surface area and increase the adsorption amount of the foreign matter 109.

  The capturing body 61 may not be fixed to the magnet 21 as long as the capturing body 61 is disposed at a position magnetized by the magnetic force of the magnet 21. Further, the magnet 21 may have an annular shape or the like through which the lubricating oil 103 can pass, and the capturing body 61 may be disposed inside the magnet 21.

  Further, the support member 80 may be made of a weak magnetic material such as soft iron and used as the capturing body 61. Further, the means for attaching the adsorbent 20 to the attachment portion 85 of the support member 80 is not limited to a screw, and may be attached by adhesion or the like. Further, the fixing portion 81 of the support member 80 may be fixed to a portion other than the lid member 113 on the inner surface of the casing 101.

  In the above-described embodiment, the adsorbent 20 is supported by the support member 80, is disposed while being held in the lubricating oil flow path 130, is fixed to the drain plug 161, and the casing 101 is The form mounted on the inner bottom surface 101a has been described. These forms may be combined, or the adsorbent 20 supported by the support member 80 or the adsorbent 20 fixed to the drain plug 161 may be disposed in the oil tank 133.

DESCRIPTION OF SYMBOLS 10 Foreign material adsorption structure, 20 Adsorbent body, 21 Magnet, 41 Non-magnetic cover, 45 String member, 61 Capture body, 80 Support member, 81 Fixing part, 83 Connection part, 85 Mounting part, 100 Gear device, 101 Casing, 103 Lubricating oil, 109 foreign matter, 111 inspection port, 113 lid member, 121 gear, 130 lubricating oil flow path, 131 suction path, 133 oil tank, 135 discharge path, 137 pump, 141 outlet side small diameter part, 143 large diameter part, 145 Entry side small diameter part, 147 step part, 151 drain part, 161 drain plug.

Claims (10)

A structure for adsorbing foreign matter in lubricating oil by an adsorbent,
The adsorbent is
A magnet,
A capturing body composed of a weak magnetic material,
The foreign matter adsorbing structure, wherein the capturing body is disposed at a position magnetized by the magnetic force of the magnet.   The foreign matter adsorbing structure according to claim 1, wherein the capturing body is configured to allow the lubricating oil to pass therethrough.   The foreign matter adsorbing structure according to claim 1, wherein the capturing body is configured by an aggregate of wires made of weak magnetic material.   The foreign matter adsorbing structure according to claim 1, wherein the capturing body is configured by a plate-like member made of a weak magnetic material in which a through hole is formed.   The foreign matter adsorbing structure according to claim 1, wherein the adsorbent further includes a nonmagnetic cover that covers the magnet.   The foreign matter adsorption structure according to claim 5, wherein the nonmagnetic cover is fixed to the magnet by a string-like member made of a nonmagnetic material or a weak magnetic material.   The foreign matter adsorbing structure according to claim 1, further comprising a lubricating oil flow path in which the adsorbent is disposed so that the position thereof is maintained.   The lubricating oil passage has a small diameter portion and a large diameter portion provided on the upstream side in the flow direction from the small diameter portion, and the adsorbent is disposed in the large diameter portion. Item 7. A foreign matter adsorption structure according to Item 7. A first flow path member having the small diameter portion and the large diameter portion formed therein;
A second flow path member that is detachably connected to the first flow path member from the upstream side in the flow direction, and a part of the lubricating oil flow path is formed inside;
The foreign matter adsorbing structure according to claim 8, wherein when the second flow path member is detached from the first flow path member, the adsorbent can be taken out from the first flow path member. A gear device in which the lubricating oil is stored;
A support member having a fixing part fixed outside the lubricating oil and an attachment part attached to the adsorbent;
The foreign matter adsorbing structure according to claim 1, wherein the adsorbent is positioned in the lubricating oil by the support member.

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