WO2016084595A1

WO2016084595A1 - Seal device and gear transmission device

Info

Publication number: WO2016084595A1
Application number: PCT/JP2015/081599
Authority: WO
Inventors: 隆秀熊谷; 義昭牧添
Original assignee: ナブテスコ株式会社
Priority date: 2014-11-25
Filing date: 2015-11-10
Publication date: 2016-06-02
Also published as: CN107002857A; DE112015005286T5; JP2016098944A; KR102476595B1; JP6460751B2; CN107002857B; KR20170087872A

Abstract

A lubricant oil seal device (50) having an oil seal (60) for preventing lubricant oil from leaking, and a foreign object capturing member (70) provided further inward than the oil seal. The foreign object capturing member has a holder (75) fixed to a device body or the oil seal, and a filter material (73) held by the holder and permeable to the lubricant oil. The filter material forms a distal end sliding part (71) for the foreign object capturing member kept in sliding contact with the device body or the oil seal in association with the relative rotation of a case and a carrier.

Description

SEALING DEVICE AND GEAR TRANSMISSION DEVICE

The present invention relates to a seal device for preventing lubricating oil or the like from leaking from the inside of a device including a gear to the outside of the device, and a gear transmission having the seal device.

For example, as shown in JP10-112952A and JP2007-46653A, various sealing devices used for gear transmissions have been proposed. JP10-112952A and JP2007-46653A have a sealing device that is filled with an oil seal for sealing the lubricating oil and a lubricating oil that is to be prevented from leaking by the oil seal, that is, inside the oil seal. And a filter provided on the side. The lubricating oil contains foreign matter, typically wear powder generated by the meshing of the gears inside the gear transmission. On the other hand, the oil seal is made of a material capable of shielding lubricating oil, such as rubber. When foreign matter such as wear powder enters an oil seal made of rubber or the like, the foreign matter may damage the oil seal. A damaged oil seal will not be able to seal the lubricant sufficiently. In order to avoid such a problem, the filter is intended to capture foreign matter inside the oil seal. JP10-112952A and JP2007-46653A exemplify a nonwoven fabric made of polyester or polyamide as the foreign matter removing means.

However, in the conventional apparatus disclosed in JP10-1292952A and JP2007-46653A, the filter made of non-woven fabric is sandwiched between the oil seal and the components of the apparatus. In such an apparatus, the oil seal can be displaced with the deformation of the filter made of nonwoven fabric or the like. In addition, the displacement of the oil seal can cause not only the deformation of the filter but also the displacement of the filter. That is, in the conventional apparatus, the means for capturing the oil seal and the foreign matter has not been able to stably perform its function.

The present invention has been made in consideration of the above points, and an object of the present invention is to provide a seal device and a gear transmission that can more stably prevent leakage of lubricating oil.

A gear transmission according to the present invention includes a device body having a case, a carrier that can rotate relative to the case, and a lubricant seal device provided between the case and the carrier. . The lubricating oil sealing device includes an oil seal for preventing leakage of the lubricating oil, and a foreign matter capturing member provided inside the oil seal. The foreign matter capturing member includes a holder fixed to the apparatus main body or the oil seal, and a filter material that is held by the holder and is permeable to the lubricating oil. The filter material forms a tip sliding contact portion of the foreign matter capturing member that is in sliding contact with either the apparatus main body or the oil seal as the case and the carrier rotate relative to each other. According to such a gear transmission, the oil seal and the foreign matter catching member can function effectively.

In the gear transmission according to the present invention, the holder includes a fixing portion fixed to the device main body or the oil seal, and an extending portion extending from the fixing portion. A part of the filter material may be held between the plate-shaped holding portions. In addition, the holder may be bent or bent at a tip portion, and a storage space for foreign matter captured by the filter material may be formed between the holder and the member in contact with the filter material.

In the gear transmission according to the present invention, the holder may be fixed to the oil seal. In this gear transmission, one of the case and the carrier includes a notch housing portion formed by cutting out in a radial direction perpendicular to the relative rotation axis of the case and the carrier, and the oil seal has the diameter Fixed on the bottom surface of the cutout receiving portion facing the other of the case and the carrier along the direction, the holder extending from the fixed portion, and a fixed portion fixed to the oil seal; An extending portion that holds a filter material, and the extending portion is connected to the notch bottom surface and extends from the notch bottom surface in the radial direction, or an end portion of the rising surface of the notch receiving portion, or Further, it may be in contact with at least a part of the rising surface.

In the gear transmission according to the present invention, the oil seal is fixed to one of the case and the carrier, slidably contacts the other of the case and the carrier with relative rotation with the case and the carrier, and captures the foreign matter. A member may be fixed to the other of the case and the carrier, and may be in sliding contact with the one of the case and the carrier or the oil seal. In this gear transmission, the oil seal extends from the base end portion in a radial direction orthogonal to a relative rotation axis of the case and the carrier, and a base end portion fixed to the one of the case and the carrier. A lip support part, and a main lip supported by the lip support part and in sliding contact with the other of the case and the carrier, and the tip sliding contact part of the foreign matter catching member You may make it slidably contact with a lip support part, and you may make it slidably contact with the said base end part of the said oil seal.

In this gear transmission, the tip sliding contact portion of the foreign material catching member is located on the one of the case and the carrier inside the position where the one oil seal of the case and the carrier is fixed. You may make it slidably contact.

In this gear transmission, the one of the case and the carrier includes a notch housing portion formed by cutting out in a radial direction perpendicular to a relative rotation axis of the case and the carrier, and the oil seal includes the Fixed to the notch bottom surface of the notch receiving portion facing the other of the case and the carrier along the radial direction, the tip sliding contact portion of the foreign matter catching member is connected to the notch bottom surface and the notch bottom surface You may make it slidably contact with the standing surface of the said notch accommodating part extended in the said radial direction from the. In this gear transmission, a protrusion projecting in the axial direction parallel to the relative rotation axis of the case and the carrier is formed at a position inside the position where the tip sliding contact portion of the rising surface is in sliding contact. May be.

In this gear transmission, the one of the case and the carrier includes a notch receiving portion formed by cutting in a radial direction perpendicular to a relative rotation axis of the case and the carrier, and the foreign object capturing member The tip sliding contact portion may be in sliding contact with the one of the case and the carrier inside the notch housing portion.

In this gear transmission, the one of the case and the carrier includes a notch housing portion formed by cutting out in a radial direction perpendicular to a relative rotation axis of the case and the carrier, and the oil seal includes the A base end portion fixed to the one of the case and the carrier, and the cutout receiving portion includes a cutout bottom surface of the cutout receiving portion facing the other of the case and the carrier along the radial direction; And a rising surface of the notch housing portion connected to the notch bottom surface and extending in the radial direction from the notch bottom surface, the notch bottom surface forming a stepped portion for receiving the base end portion of the oil seal The tip sliding contact portion of the foreign material capturing member may be in sliding contact with the bottom surface of the notch inside the stepped portion. In this gear transmission, a convex portion protruding in the axial direction parallel to the relative rotation with the case and the carrier may be formed on the rising surface.

A sealing device according to the present invention is used in a device main body having a case and a carrier that is rotatable relative to the case and includes at least one gear, and is used for lubricating oil from between the case and the carrier. This is a sealing device for preventing leakage. The sealing device includes an oil seal provided between the case and the carrier for preventing leakage of the lubricating oil, and a foreign matter capturing member provided inside the oil seal. The foreign matter capturing member includes a holder fixed to the apparatus main body or the oil seal, and a filter material that is held by the holder and is permeable to the lubricating oil. The filter material forms a tip sliding contact portion of the foreign matter capturing member that is in sliding contact with either the apparatus main body or the oil seal as the case and the carrier rotate relative to each other. According to such a sealing device, the oil seal and the foreign matter capturing member can function effectively.

According to the present invention, the leakage of the lubricating oil can be prevented more stably.

It is a figure for explaining one embodiment of the present invention, and is a sectional view showing an example of a gear transmission. It is a figure which shows the structure corresponded to the part A of FIG. 1, Comprising: The figure which shows the 1st specific example of a sealing device. It is a figure corresponding to FIG. 2, Comprising: The figure which shows the 2nd specific example of a sealing device. It is a figure corresponding to FIG. 2, Comprising: The figure which shows the 3rd specific example of a sealing device. It is a figure corresponding to FIG. 2, Comprising: The figure which shows the 4th example of a sealing device. It is a figure corresponding to FIG. 2, Comprising: The figure which shows the 5th example of a sealing device. It is a figure corresponding to FIG. 2, Comprising: The figure which shows the 6th specific example of a sealing device. It is a figure corresponding to FIG. 2, Comprising: The figure which shows the 7th example of a sealing device.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram illustrating an example of a gear transmission to which a sealing device can be applied. On the other hand, FIGS. 2 to 8 are diagrams showing some specific examples of the sealing device according to the present invention.

The gear transmission 10 includes a device main body 11 having at least one gear, and a sealing device 50 provided for sealing lubricating oil in the device main body 11. Among these, the sealing device 50 is devised to more stably prevent leakage of the lubricating oil. The sealing device 50 can be applied to the device main body 11 having various configurations. FIG. 1 shows an example of a device main body 11 to which the sealing device 50 can be suitably applied. First, the overall configuration of the apparatus main body 11 shown in FIG. 1 will be described.

The device main body 11 of the gear transmission 10 includes a case 20, a carrier 30, a crankshaft 44, and two external gears 47a and 47b. The case 20 has an internal gear 21. The crankshaft 44 drives the two external gears 47 a and 47 b and is supported by the carrier 30. In the apparatus main body 11, the external gear 47a, by 47b is engaged with the internal gear 21, carrier 30 rotates relative to the case 20 around a rotation axis _{a m.}

The carrier 30 has a first plate 31 and a second plate 32 that are fixed to each other by a fastener. Carrier 30 and the case 20, by a pair of angular ball bearings 12 are rotatably connected around a rotation axis a _m. The carrier 30 is formed with a through hole 33 that penetrates the first and second plates 31 and 32. Through holes 33 are provided three spaced equidistant on about the rotation axis a _m circumference. A crankshaft 44 is rotatably supported in each of the three through holes 33 via first and second cylindrical roller bearings 13a and 13b. Note that the rotation axis a _c of the crankshaft 44 is parallel to the relative rotation axis a _m between the case 20 and the carrier 30. Hereinafter, a direction parallel to the relative rotational axis a _m between the case 20 and the carrier 30 is referred to as an “axial direction d _a ”, and a direction orthogonal to the relative rotational axis a _m between the case 20 and the carrier 30 is referred to as a “radial direction d”. _r ".

Crankshaft 44 has two eccentrics 45a arranged in the axial direction _{d a,} and 45b, the input gear 46, the. Each eccentric body 45a, 45b has a disk-shaped or columnar outer shape. The central axes a _ca and a _cb of the two eccentric bodies 45 a and 45 b are eccentrically symmetrically centered on the rotation axis a _c of the crankshaft 44. Two external gears 47a, 47b are in the first and the space formed between the second plate 31 and 32 of the carrier 30 are arranged in the axial direction _{d a.} Each external gear 47a, 47b has eccentric body insertion holes 48a, 48b for accommodating corresponding eccentric bodies 45a, 45b via third and fourth cylindrical roller bearings 13c, 13d. The number of teeth of the external gears 47a and 47b is smaller than the number of teeth of the internal gear 21 of the case 20 (for example, only one is smaller). Further, the outer diameters of the external gears 47 a and 47 b are slightly smaller than the inner diameter of the internal gear 21 of the case 20.

In the apparatus main body 11 having the configuration described above, the torque from the drive device 5 such as a motor is transmitted to the input gear 46, the crankshaft 44 rotates about the rotation axis a _c. At this time, the first and second eccentric bodies 45a and 45b rotate eccentrically to drive the corresponding external gears 47a and 47b so that the external gears 47a and 47b mesh with the internal gear 21 of the case 20. . As a result, the external gears 47a, 47b swings rotates with respect to the case 20, the external gear 47a via a crank shaft 44, a carrier 30 for supporting and 47b also, the central axis as a rotation axis _{a m,} Case Rotate with respect to 20.

The gear transmission 10 having the apparatus main body 11 can be used as a speed reducer for a turning part such as a turning body or arm joint of a robot, a turning part of various machine tools, or the like. As a specific example, the case 20 is fixed to the base of the robot, and the carrier 30 is connected to the revolving drum of the robot, thereby rotating the revolving drum with high torque with respect to the base and rotating the revolving drum with high accuracy. Can be controlled.

In such a gear transmission 10, lubricating oil such as oil or grease is filled between the case 20 and the carrier 30 in order to smoothly rotate the case 20 and the carrier 30 relative to each other. As shown in FIG. 1, a seal device 50 for preventing leakage of lubricating oil is provided between the case 20 and the carrier 30. 2 to 8 show specific examples of the sealing device 50 as enlarged views of the portion A in FIG. As a configuration common to the sealing device 50 shown in FIGS. 2 to 8, the sealing device 50 includes an oil seal 60 and a foreign matter capturing member 70.

Of these, the oil seal 60 seals the gap between the case 20 and the carrier 30. By installing the oil seal 60, it is possible to prevent the lubricating oil filled in the apparatus main body 11 from leaking between the case 20 and the carrier 30 of the apparatus main body 11. Therefore, the oil seal 60 is formed in an annular shape so as to fill an annular gap between the case 20 and the carrier 30 in the apparatus main body 11. The oil seal 60 is fixed to one of the case 20 and the carrier 30 and comes into contact with the other of the case 20 and the carrier 30. In the gear transmission 10, the case 20 and the carrier 30 rotate relative to each other. As the case 20 and the carrier 30 rotate relative to each other, the oil seal 60 is in sliding contact with the other of the case 20 and the carrier 30, that is, slides to maintain the contact state. Such an oil seal 60 is made of a material that can shield the lubricating oil and has a flexibility that can slide in contact with the other of the case 20 and the carrier 30, for example, rubber.

The apparatus main body 11 includes components such as an internal gear 21, external gears 47a and 47b, and a crankshaft 44. During operation of the apparatus main body 11, these parts engage with each other and come into sliding contact with each other, so that foreign matters typified by metal wear powder are generated in the lubricating oil. When such foreign matter enters the sliding contact portion between the oil seal 60 and the apparatus main body 11, the oil seal 60 may be damaged by the foreign matter. If foreign matter is caught in the sliding contact portion or the oil seal 60 is damaged, the gap between the case 20 and the carrier 30 cannot be sufficiently sealed. Therefore, a foreign matter capturing member 70 is provided. The foreign matter capturing member 70 is provided inside the oil seal 60 and captures foreign matter. Here, “inside” indicates the side of the apparatus main body 11 that is filled with lubricating oil that should be prevented from leaking by the oil seal 60.

The foreign matter capturing member 70 extends between the case 20 and the carrier 30 of the apparatus main body 11 and closes the annular gap between the case 20 and the carrier 30 in the apparatus main body 11. The foreign material capturing member 70 includes a filter material 73 that can allow the lubricating oil to pass therethrough while capturing foreign material, and a holder 75 that holds the filter material 73. The foreign matter capturing member 70 is fixed to one of the case 20 and the carrier 30 and slidably contacts the other of the case 20 or the carrier 30 as the case 20 and the carrier 30 rotate relative to each other. Alternatively, the object to which the foreign substance capturing member 70 is fixed or the object that is in sliding contact may be the oil seal 60. The filter material 73 of the foreign material capturing member 70 forms a tip sliding contact portion 71 that is in sliding contact with either the apparatus main body 11 or the oil seal 60 as the case 20 and the carrier 30 rotate relative to each other. The filter material 73 can pass the lubricating oil while absorbing and holding the lubricating oil. For this reason, the tip sliding contact portion 71 of the foreign material catching member 70 always holds the lubricating oil, and damage and deterioration of the tip sliding contact portion 71 can be effectively prevented.

As such a filter material 73, a nonwoven fabric or a woven fabric formed using various fibers, a porous material formed of a resin or a foamed material, or the like can be used. On the other hand, since it is not necessary for the holder 75 to form the tip sliding contact portion 71, not only the resin but also a metal, particularly a light metal such as aluminum, can be suitably used. The metal holder 75 can stably hold the filter material 73 forming the tip sliding contact portion 71 at a predetermined position.

That is, in the sealing device 50 described here, the foreign material capturing member 70 has a filter material 73 that is permeable to lubricating oil and capable of capturing foreign materials, and the filter material 73 is supported by the holder 75. ing. Therefore, the filter material 73 does not need to be fixed to the apparatus main body 11 using the oil seal 60, unlike the prior art disclosed in the above-mentioned Japanese Patent Laid-Open Nos. 10-112952 and 2007-46653. . The filter material 73 can be disposed away from the oil seal 60 using a holder 75 having a relatively high rigidity. For this reason, the oil seal 60 can be stably disposed without being affected by the installation of the filter material 73. Therefore, according to the sealing device 50, the oil seal 60 and the foreign matter capturing member 70 can function effectively.

Hereinafter, some specific application examples of such a sealing device 50 will be described with reference to FIGS. The examples shown in FIGS. 2 to 8 are enlarged views showing a portion corresponding to the portion A in FIG. Thus, FIGS. 2 to 8, in cross-section in the radial direction d _r of the gear transmission 10, shows a sealing device 50. As described above, the sealing device 50 seals the gap between the case 20 and the carrier 30. Therefore, in the application to the apparatus main body 11 described with reference to FIG. 1, the oil seal 60 and the foreign matter capturing member 70 of the sealing apparatus 50 are each formed in an annular shape as an overall shape. In addition, in FIGS. 2 to 8 used in the following description and the following description, corresponding components, members, parts and the like are denoted by the same reference numerals, and redundant description is omitted.

<First specific example>
First, a first specific example of the sealing device 50 shown in FIG. 2 will be described. As shown in FIG. 2, in the first specific example, the oil seal 60 is fixed to the case 20 of the apparatus main body 11. Leading portion d _a of the case 20 is cut in the radial direction d _r. And the notch accommodating part 15 for arrange | positioning the sealing apparatus 50 is formed in this part of case 20. As shown in FIG. Cutout accommodating portion 15 has a notch bottom 16 that faces the carrier 30 in the radial direction d _r, a rising surface 17 which extends out to the connected and radially from the notch bottom 16 d _r in the notch bottom 16, the ing. In the cutout accommodating portion 15 of FIG. 2, the notch bottom surface 16 extends parallel to the axial direction d _a, rising surfaces 17 extend parallel to the radial direction d _r.

The oil seal 60 includes a base end portion 61 fixed to the apparatus main body 11, a lip support portion 62 extending from the base end portion 61 in the radial direction _dr , a main lip 63 supported by the lip support portion 62, and a lip support portion 62. Strip 64. Oil seal 60 is supported from the radially d _r by the notch bottom 16, and, so as to be supported in the axial direction d _a the rising surface 17 is fixed to the cutout accommodating portion 15. That is, the base end portion 61 of the oil seal 60 is connected to the notch bottom surface 16 of the notch accommodating portion 15 and a part of the rising surface 17 on the side connected to the notch bottom surface 16. In the example shown in FIG. 2, the base end portion 61, outwardly in the axial direction d _a, it has thickened.

Lip supporting part 62 is connected to the base end portion 61 at the outer end in the radial direction d _r. From the inside end in the radial direction d _r of the lip supporting part 62, the main lip 63 and the dust lip 64 extending out. The main lip 63 includes a reinforcing material 63a made of, for example, metal, and its deformation is suppressed. The main lip 63 is urged to contact the carrier 30 due to the overall shape of the oil seal 60. The main lip 63 is in sliding contact with the carrier 30 with the relative rotation of the case 20 and the carrier 30. The main lip 63 is intended to prevent leakage of lubricating oil from the inside of the apparatus body 11. The dust lip 64 is in contact with the carrier 30 at a position outside the main lip 63. The dust strip 64 is intended to restrict foreign matters such as dust in the atmosphere from entering the apparatus main body 11 by slidingly contacting the carrier 30. Except for the reinforcing material 63a of the main lip 63, the oil seal 60 can be integrally formed from the above-described materials such as rubber and resin.

As described above, the foreign material capturing member 70 includes the filter material 73 for capturing the foreign material and the holder 75 that holds the filter material 73. As shown in FIG. 2, the holder 75 has a fixing portion 76 fixed to the oil seal 60 and an extending portion 77 extending from the fixing portion 76. In the first specific example, the fixing portion 76 of the foreign material capturing member 70 is fixed to the oil seal 60. The extending portion 77 is formed in a thin plate shape as a whole. The extension part 77 includes a pair of plate-like holding parts 78 on the side away from the fixing part 76. A pair of plate-shaped holding portion 78, are laminated in the axial direction d _a. The sheet-like filter material 73 is disposed between the pair of plate-like holding portions 78 and is sandwiched between the pair of plate-like holding portions 78. The filter material 73 is exposed from the end of the plate-like holding portion 78 on the side away from the fixing portion 76. This exposed portion of the filter material 73 forms a tip sliding contact portion 71 that is in sliding contact with the carrier 30. In particular, in the illustrated example, the filter material 73 is exposed from between the pair of plate-shaped holding portions 78 only at the portion that forms the tip sliding contact portion 71 of the foreign material capturing member 70.

As shown in FIG. 2, the extraneous matter catching member 70 on the side of the tip sliding portion 71, so that inward in the axial direction d _a as close to the front end contact portion 71 along the radial direction d _r, the diameter It is inclined with respect to the direction _{d r.} The extending portion 77 of the holder 75 is in contact with the end portion of the rising surface 17 of the notch accommodating portion 15, that is, the end portion of the notch accommodating portion 15.

In the sealing device 50 of the first specific example described above, the holder 75 is fixed on the oil seal 60. Therefore, it is not necessary to separately prepare a dedicated part (surface, region) for fixing the holder 75 in the apparatus main body 11. For this reason, the sealing device 50 can be reduced in size. Further, by fixing the foreign matter holding member 70 to the oil seal 60 in advance, the foreign matter holding member 70 can be attached to the apparatus main body 11 together with the oil seal 60 when the oil seal 60 is attached to the apparatus main body 11. Therefore, the assembly of the gear transmission 10 can be facilitated.

Further, according to the sealing device 50 of the first specific example, the extending portion 77 of the holder 75 can be supported by the rising surface 17 of the notch accommodating portion 15. Therefore, the posture of the foreign material capturing member 70 including the holder 75 is stabilized. As a result, the foreign material capturing member 70 can sufficiently exhibit the expected foreign material capturing function, and accordingly, the oil seal 60 can sufficiently exhibit the expected lubricating oil leakage preventing function. .

Furthermore, in the sealing device 50 of the first embodiment, the extraneous matter catching member 70 inward in the axial direction d _a as the side of the tip sliding portion 71, proximate to the tip sliding portion 71 along the radial direction d _r as toward and is inclined with respect to the radial direction d _r. According to such arrangement of the extraneous matter catching member 70 with respect to the lubricating oil that flows from the inside to the outside along the axial direction d _a, the foreign body capturing member 70 may be difficult to sufficiently deformed. As a result, the foreign substance capturing member 70 and the oil seal 60 can sufficiently exhibit the expected functions, and the sealing of the lubricating oil by the seal device 50 can be more reliably realized.

Furthermore, in the sealing device 50 of the first specific example, the filter material 73 that is relatively flexible and easily deformed is held between a pair of plate-like holding portions 78. Therefore, the plate-shaped holding portion 78 can be brought into contact with the surface to hold the filter material 73 stably. For this reason, it is possible to effectively prevent deformation of the filter material 73 such as displacement and expansion / contraction. As a result, the foreign material capturing member 70 can effectively exhibit the expected function and effectively prevent the foreign material mixed in the lubricating oil from reaching the oil seal 60.

<Second specific example>
Next, a second specific example of the sealing device 50 shown in FIG. 3 will be described. In the second specific example, the configuration of the oil seal 60 and the configuration of the notch housing portion 15 of the case 20 to which the oil seal 60 is fixed are the same as those of the first specific example.

In the sealing device 50 of the second specific example, the foreign matter capturing member 70 is fixed to the oil seal 60 as in the first specific example. Therefore, effects such as downsizing of the sealing device 50 and easy assembly of the gear transmission 10 can be obtained. In addition, in the second embodiment, the fixing portion 76 of the holder 75 is supported in the axial direction d _a the rising surface 17 of the cut-out accommodating portion 15. For this reason, arrangement | positioning of the foreign material capture member 70 is stabilized more, and the sealing apparatus 50 can prevent the leakage of lubricating oil more effectively. Further, the extending portion 77 of the holder 75 is in contact with the rising surface 17 of the notch housing portion 15 by the surface and is supported by the rising surface 17. Therefore, according to the second specific example, the posture of the foreign material capturing member 70 including the holder 75 can be further stabilized. As a result, the sealing device 50 can more effectively prevent the leakage of the lubricating oil.

Further, in the sealing device 50 of the second specific example, the filter material 73 that is relatively flexible and easily deformed is held between a pair of plate-like holding portions 78, as in the first specific example. Yes. Further, the extending portion 77 is curved or bent in the region of the holding portion 78. Therefore, the plate-shaped holding portion 78 comes into contact with the surface to hold the filter material 73 more stably, and further the deformation of the filter material 73 between the pair of plate-shaped holding portions 78 such as displacement and expansion / contraction It can be effectively prevented. As a result, the foreign material capturing member 70 can effectively exhibit the expected function and effectively prevent foreign materials mixed in the lubricating oil from reaching the oil seal.

<Third specific example>
Next, a third specific example of the sealing device 50 shown in FIG. 4 will be described. In the third specific example, the configuration of the oil seal 60 and the configuration of the notch housing portion 15 of the case 20 to which the oil seal 60 is fixed are the same as those of the first specific example and the second specific example. On the other hand, in the third specific example, unlike the first specific example and the second specific example, the foreign matter capturing member 70 is a member of the case 20 and the carrier 30 on which the oil seal 60 is not fixed, It is fixed. That is, the foreign material capturing member 70 is fixed to the carrier 30, and the tip sliding contact portion 71 of the foreign material capturing member 70 is in sliding contact with the oil seal 60.

As shown in FIG. 4, a support step 18 is formed on the carrier 30. Carrier 30 via a supporting step portion 18 is reduced in diameter from the inner side of the axial direction d _a outward. The fixing portion 76 of the holder 75 is fixed to the carrier 30 by using the support step portion 18. That is, in the third embodiment shown in FIG. 4, the extraneous matter catching member 70, the carrier 30 is supported from the inside inward and axially d _a in the radial direction d _r. Extending portion 77 of the holder 75, first, extend out from the fixed portion 76 outward in the radial direction d _r, then extends outwardly in the axial direction d _a. That is, the extension part 77 of the holder 75 is curved or bent. Further, the plate-like holding portion 78 forming the extending portion 77 holds the filter material 73 even in the curved or bent portion. The tip sliding contact portion 71 of the foreign matter capturing member 70 is in sliding contact with the lip support portion 62 of the oil seal 60. Distal sliding portion 71 of the extraneous matter catching member 70, relative to the lip supporting portion 62 extending radially d _r, are in contact with the inner in the axial direction d _a.

In the sealing device 50 of the third specific example described above, the foreign matter capturing member 70 is fixed to a member of the case 20 and the carrier 30 on which the oil seal 60 is not fixed. According to such a sealing device, the distance from the inner side of the sealing device 50 to the main lip 63 of the oil seal 60 via the tip sliding contact portion 71 of the foreign material capturing member 70 is increased and complicated. can do. Thereby, it is possible to more effectively prevent foreign matters such as abrasion powder mixed in the lubricating oil from reaching the oil seal 60.

Further, according to the sealing device 50 of the third specific example, the filter material 73 of the foreign material capturing member 70 is in sliding contact with the oil seal 60 having a lower hardness than the case 20 and the carrier 30 of the device main body 11. Therefore, damage and deterioration of the filter material 73 forming the tip sliding contact portion 71 can be effectively suppressed. Further, the path from the inside to the main lip 63 of the oil seal 60 via the tip sliding contact portion 71 of the foreign material capturing member 70 from the inner side than the sealing device 50 can be made longer and more complicated. Thereby, it is possible to more effectively prevent foreign matters such as wear powder mixed in the lubricating oil from reaching the oil seal 60. Furthermore, the tip sliding portion 71 of the extraneous matter catching member 70, to abut from inside the lip supporting part 62 of the oil seal 60 in the axial direction d _a, at the time of assembly of the gear transmission 10, the oil from the outside in the axial direction d _a By fitting the seal 60, the oil seal 60 can be relatively easily fixed to the apparatus main body 11 with the foreign matter capturing member 70 already attached.

Furthermore, in the sealing device 50 of the third specific example, the filter material 73 that is relatively flexible and easily deformed is held between a pair of plate-like holding portions 78. Further, the extending portion 77 is curved or bent in the region of the holding portion 78. Therefore, similarly to the second specific example, it is possible to effectively prevent the displacement of the filter material 73 between the pair of plate-shaped holding portions 78 and deformation such as expansion and contraction.

<Fourth specific example>
Next, a fourth specific example of the sealing device 50 shown in FIG. 5 will be described. In the fourth specific example, the configuration of the oil seal 60 and the configuration of the notch housing portion 15 of the case 20 to which the oil seal 60 is fixed are the same as those in the first to third specific examples. Further, in the fourth specific example, the configuration of the fixing portion 76 of the holder 75 of the foreign material capturing member 70 and the configuration of the carrier 40 fixed to the fixing portion 76 are the same as those in the third specific example. The fourth specific example is different from the third specific example in the position where the tip sliding contact portion 71 of the foreign material capturing member 70 contacts, and can be the same as the third specific example in other configurations. Therefore, in the following description, the description of the same configuration as that of the third specific example is omitted, and only the description of the different configuration is described.

That is, as shown in FIG. 5, in the sealing device 50 of the fourth specific example, the holder of the foreign material capturing member 70 has the fixing portion 76 fixed to the carrier 30 and is curved or bent, but generally in the radial direction d. _r . The tip sliding contact portion 71 of the foreign matter capturing member 70 is in sliding contact with the base end portion 61 of the oil seal 60. In addition, the base end portion 61 of the oil seal 60 with which the foreign matter capturing member 70 is in sliding contact is fixed to the apparatus main body 11. Therefore, the relative positional relationship between the foreign matter capturing member 70 and the oil seal 60 is stabilized. As a result, the foreign material capturing member 70 can effectively exhibit the expected function and effectively prevent the foreign material mixed in the lubricating oil from reaching the oil seal 60.

<Fifth example>
Next, a fifth specific example of the sealing device 50 shown in FIG. 6 will be described. In the fifth specific example, the configuration of the oil seal 60 and the configuration of the notch accommodating portion 15 of the case 20 to which the oil seal 60 is fixed are the same as those in the first to fourth specific examples. Further, in the fifth specific example, the configuration of the fixing portion 76 of the holder 75 of the foreign material capturing member 70 and the configuration of the carrier 30 fixed to the fixing portion 76 are the same as those in the third and fourth specific examples. . The fifth specific example is different from the third and fourth specific examples in the position where the tip sliding contact portion 71 of the foreign material capturing member 70 contacts, and the other configurations are the same as the third and fourth specific examples. Can do. Therefore, in the following description, description of the same configuration as that of the above-described fourth specific example is omitted, and only description of a different configuration is described.

As shown in FIG. 6, the tip sliding contact portion 71 of the foreign material capturing member 70 is a position where the oil seal 60 is fixed to the member of the case 20 and the carrier 30 to which the oil seal 60 is fixed. It is in sliding contact at a position on the inner side. More specifically, the tip sliding contact portion 71 of the foreign material capturing member 70 is in sliding contact with a position on the inner side of the position where the oil seal 60 of the case 20 is fixed. According to such a sealing device 50, when the apparatus main body 11 is assembled with the foreign matter capturing member 70 fixed to the case 20 or the carrier 30, the foreign matter capturing member 70 is attached before the oil seal 60 is attached to the apparatus main body 11. It can be confirmed whether the device main body 11 is attached to an appropriate position. More specifically, before attaching the oil seal 60 to the apparatus main body 11, it is possible to confirm whether or not the tip sliding contact portion 71 of the foreign material capturing member 70 is in contact with a predetermined position of the apparatus main body 11. As a result, in the finally assembled gear transmission 10, the foreign matter catching member 70 effectively exhibits the expected function, and the foreign matter mixed in the lubricating oil effectively reaches the oil seal 60. Can be prevented.

In particular, in the fifth specific example shown in FIG. 6, the tip sliding contact portion 71 of the foreign material capturing member 70 is in sliding contact with the rising surface 17 of the notch housing portion 15, and the rising surface 17 is substantially in the radial direction _dr. It extends along. According to such a sealing device 50, as shown in FIG. 6, the foreign matter capturing member 70 bulges by bending or bending near the tip sliding contact portion 71 without causing a significant expansion of the occupied space. The bulging portion 72 thus formed can be formed. An accommodating space for accommodating the foreign matter captured by the filter material 73 can be formed between the bulging portion 72 of the foreign matter capturing member 70 and the rising surface 17. By forming the accommodation space by the bulging portion 72, the foreign material capturing member 70 can continue to function effectively over a long period of time without being harmed by the captured foreign material. Thereby, the maintenance frequency of the gear transmission 10 can be reduced.

Meanwhile, as shown in FIG. 6 with two-dot chain line, the position where the tip sliding portion 71 of the rising surface 17 is inner than the sliding contact position, has projection 17a is provided projecting outward in the axial direction d _a May be. In the example shown in FIG. 6, the convex portion 17 a forms a labyrinth path between the convex portion 17 a and the foreign material capturing member 70. By providing such a path, it is possible to prevent a large foreign matter, for example, a broken piece of a member constituting the apparatus main body 11 from reaching the tip sliding contact portion 71 of the foreign matter catching member 70. As a result, the oil seal 60 and the foreign matter capturing member 70 can function more stably and effectively, and the seal device 50 can more stably and effectively exhibit the lubricating oil leakage prevention function.

<Sixth specific example>
Next, a sixth example of the sealing device 50 shown in FIG. 7 will be described. In the sixth specific example, the configuration of the oil seal 60 and the configuration of the notch accommodating portion 15 of the case 20 to which the oil seal 60 is fixed are the same as those of the first to fifth specific examples. In the sixth specific example, the configuration of the fixing portion 76 of the holder 75 of the foreign material capturing member 70 and the configuration of the carrier 30 fixed to the fixing portion 76 are the same as those in the third to fifth specific examples. . The sixth specific example is different from the fifth specific example in the position where the tip sliding contact portion 71 of the trapping member 70 contacts, and can be the same as the fifth specific example in other configurations. Therefore, in the following description, the description of the same configuration as that of the fifth specific example is omitted, and only the description of the different configuration is described.

That is, as shown in FIG. 7, the tip sliding contact portion 71 of the foreign material capturing member 70 is in sliding contact with the apparatus main body 11 inside the notch housing portion 15 to which the oil seal 60 is fixed. According to such a sealing device 50, the length along the radial direction d _r of the extraneous matter catching member 70 can be considerably shortened. Therefore, the posture of the foreign matter catching member 70 is stabilized, the foreign matter catching member 70 effectively exhibits the expected function, and effectively prevents the foreign matter mixed in the lubricating oil from reaching the oil seal 60. Can do. Moreover, the material cost of the foreign material capturing member 70 can be reduced.

<Seventh specific example>
Next, a seventh specific example of the sealing device 50 shown in FIG. 8 will be described. In the seventh specific example, the configuration of the oil seal 60, the configuration of the fixing portion 76 of the holder 75 of the foreign matter capturing member 70, and the configuration of the carrier 30 fixed to the fixing portion 76 are the same as those of the third to sixth specific examples. It has become. The seventh specific example is different from the fourth specific example in the configuration of the cutout accommodating portion 15 and the position where the tip sliding contact portion 71 of the foreign material capturing member 70 abuts. In other configurations, for example, the same as the fourth specific example. can do.

As shown in FIG. 8, the notch accommodating portion 15 has a notch bottom surface 16 and a rising surface 17 as in the first to sixth specific examples. Notch bottom 16 extending generally axially _{d a,} rising surfaces 17, extending generally radially _{d r.} The notched bottom surface 16 is formed with a step portion 16 a that receives the base end portion 61 of the oil seal 60. The size of the step of the stepped portion 16a has a same as the thickness of the base end portion 61 of the oil seal 60 at the inner end in the axial direction d _a. As a result, in the cutout accommodating portion 15, the base end portion 61 of the oil seal 60 and the portion of the cutout bottom surface 16 that is not covered by the base end portion 61 are connected flush with each other.

The foreign matter capturing member 70 is fixed to a member of the case 20 and the carrier 30 that is not fixed with the oil seal 60. With this configuration, it is possible to more effectively prevent foreign matters mixed in the lubricating oil from reaching the oil seal 60 as in the third to sixth specific examples. The tip sliding contact portion 71 is in sliding contact with the apparatus main body 11 at a position inside the position where the oil seal 60 is fixed. According to such a sealing device 50, as in the fifth and sixth specific examples, when the device main body 11 is assembled with the foreign matter capturing member 70 fixed to the case 20 or the carrier 30, the oil seal 60 is attached to the device main body. Before attaching to the apparatus 11, it can be confirmed whether the foreign substance capturing member 70 is attached to an appropriate position of the apparatus main body 11.

In addition, as shown in FIG. 8, in the seventh specific example, the tip sliding contact portion 71 of the foreign material capturing member 70 is in sliding contact with the cutout bottom surface 16 on the inner side of the stepped portion 16a. According to such a sealing device 50, it is possible to ensure a long path length from the inner side to the oil seal 60 via the tip sliding contact portion 71 of the foreign matter capturing member 70 from the inside of the sealing device 50. Thereby, it is possible to more effectively prevent foreign matter such as wear powder mixed in the lubricating oil from reaching the oil seal. In addition, as shown by the two-dot chain line in FIG. 8, it is effective to provide a projection 17a that projects outward in the axial direction d _a to the rising surface 17. By forming the labyrinth path by providing the convex portion 17a, as described in the fifth embodiment, a large foreign matter, for example, a broken piece of a member constituting the apparatus main body 11 is caused by the foreign matter capturing member 70. Reaching the tip sliding contact portion 71 can be prevented.

Further, in the seventh specific example shown in FIG. 8, the filter material 73 that is relatively flexible and easily deformed is held between a pair of plate-like holding portions 78, and the extending portion 77 is The holding portion 78 is curved or bent in the region. Therefore, as in the second to sixth specific examples, it is possible to effectively prevent the displacement of the filter material 73 between the pair of plate-like holding portions 78 and deformation such as expansion and contraction.

In the present embodiment described above, the foreign material capturing member 70 of the sealing device 50 has the filter material 73 that is permeable to the lubricating oil and can capture the foreign material. 75. That is, the filter material 73 does not need to be fixed to the apparatus main body 11 using the oil seal 60 unlike the above-described conventional technology. The filter material 73 can be disposed away from the oil seal 60 using a holder 75 having a relatively high rigidity. For this reason, the oil seal 60 can be stably disposed without being affected by the installation of the filter material 73. Therefore, according to the sealing device 50, the oil seal 60 and the foreign matter capturing member 70 can function effectively.

Note that various modifications can be made to the above-described embodiment. First, in the above-described embodiment, the example in which the oil seal 60 is fixed to the case 20 has been described. However, the present invention is not limited thereto, and the oil seal 60 may be fixed to the carrier 30. In this modification, the foreign matter capturing member 70 may be fixed on the oil seal 60 fixed to the carrier 30 as in the first and second specific examples described above, or the foreign matter capturing member 70 may be As in the third to seventh specific examples described above, the member to which the oil seal 60 is not fixed, that is, the case 20 may be fixed.

Further, the notch accommodating portion 15 described in the seventh specific example of the above-described embodiment, that is, the notch accommodating portion 15 in which the step portion 16a is formed on the notch bottom surface 16 is applied to the first to sixth specific examples. It is possible. Furthermore, in the first specific example and the sixth specific example of the above-described embodiment, the extension portion 77 of the holder 75 may be curved or bent in the region of the filter material 73 plate-like holding portion 78. Moreover, the foreign material capturing member 70 has the bulging portion 72 and the foreign material captured by the foreign material capturing member 70 is accommodated by the bulging portion 72 without being limited to the fifth specific example of the above-described embodiment. A main space may be formed. Further, without being limited to the fifth and seventh specific examples of the above-described embodiment, a convex portion 17a is formed in the vicinity of a portion where the tip sliding contact portion 71 is in sliding contact, and a labyrinth is formed by the convex portion 17a. You may do it.

Claims

A device body having a case and a carrier that is rotatable relative to the case;
A lubricating oil seal device provided between the case and the carrier,
The lubricating oil seal device is
An oil seal for preventing leakage of the lubricating oil;
A foreign matter capturing member provided inside the oil seal,
The foreign matter capturing member has a holder fixed to the apparatus main body or the oil seal, and a filter material that is held by the holder and through which the lubricating oil can pass.
The gear transmission, wherein the filter material forms a tip sliding contact portion of the foreign matter capturing member that is in sliding contact with either the device main body or the oil seal with relative rotation between the case and the carrier.
The holder has a fixed portion fixed to the apparatus main body or the oil seal, and an extending portion extending from the fixed portion,
2. The gear transmission according to claim 1, wherein the extension portion holds a part of the filter material between a pair of plate-like holding portions.
The gear transmission according to claim 1 or 2, wherein the holder is bent or bent at a tip portion, and forms a storage space for foreign matter captured by the filter material and a member in sliding contact with the filter material.
The gear transmission according to any one of claims 1 to 3, wherein the holder is fixed to the oil seal.
One of the case and the carrier includes a notch accommodating portion formed by notching in a radial direction perpendicular to the relative rotation axis of the case and the carrier,
The oil seal is fixed on a notch bottom surface of the notch accommodating portion facing the other of the case and the carrier along the radial direction,
The holder has a fixed portion fixed to the oil seal, and an extended portion that extends from the fixed portion and holds the filter material,
The extended portion is connected to the bottom surface of the notch and extends in the radial direction from the bottom surface of the notch, and is in contact with an end portion of the rising surface of the notch housing portion or at least a part of the rising surface. Item 5. The gear transmission according to Item 4.
The oil seal is fixed to one of the case and the carrier, and is in sliding contact with the other of the case and the carrier with relative rotation with the case and the carrier;
The gear transmission according to any one of claims 1 to 3, wherein the foreign matter catching member is fixed to the other of the case and the carrier and is in sliding contact with the one of the case and the rotating body or the oil seal. apparatus.
The oil seal includes a base end portion fixed to the one of the case and the carrier, a lip support portion extending from the base end portion in a radial direction perpendicular to a relative rotation axis of the case and the carrier, A main lip supported by the lip support portion and in sliding contact with the other of the case and the carrier;
The gear transmission according to claim 6, wherein the tip sliding contact portion of the foreign material capturing member is in sliding contact with the lip support portion of the oil seal.
The oil seal includes a base end portion fixed to the one of the case and the carrier, a lip support portion extending from the base end portion in a radial direction perpendicular to a relative rotation axis of the case and the carrier, A main lip supported by the lip support portion and in sliding contact with the other of the case and the carrier;
The gear transmission according to claim 6, wherein the tip sliding contact portion of the foreign material capturing member is in sliding contact with the base end portion of the oil seal.
The tip sliding contact portion of the foreign material catching member is in sliding contact with the one of the case and the carrier inside a position where the one oil seal of the case and the carrier is fixed. The gear transmission described in 1.
The one of the case and the carrier includes a cutout accommodating portion formed by cutting out in a radial direction perpendicular to the relative rotation axis of the case and the carrier,
The oil seal is fixed to a notch bottom surface of the notch accommodating portion facing the other of the case and the rotating body along the radial direction,
The gear transmission according to claim 6, wherein the tip sliding contact portion of the foreign material capturing member is slidably contacted with a rising surface of the notch receiving portion that is connected to the notch bottom surface and extends in the radial direction from the notch bottom surface. .
The convex part which protruded in the direction of an axis parallel to the relative axis of rotation of the case and the carrier is formed in the position which becomes inward rather than the position where the tip sliding contact part of the standing surface touches. The gear transmission of 10.
The one of the case and the carrier includes a notch accommodating portion formed by notching in a radial direction perpendicular to a relative rotation axis of the case and the rotating body,
7. The gear transmission according to claim 6, wherein the tip sliding contact portion of the foreign material capturing member is in sliding contact with the one of the case and the rotating body inside the notch receiving portion.
The one of the case and the carrier includes a cutout accommodating portion formed by cutting out in a radial direction perpendicular to the relative rotation axis of the case and the carrier,
The oil seal has a base end fixed to the one of the case and the carrier,
The notch accommodating portion is connected to the notch bottom surface of the notch accommodating portion facing the other of the case and the carrier along the radial direction, and is connected to the notch bottom surface and extends in the radial direction from the notch bottom surface. A rising surface of the cutout accommodating portion,
The notch bottom surface is formed with a step portion for receiving the base end portion of the oil seal,
The gear transmission according to claim 6, wherein the sliding end portion of the foreign material capturing member is in sliding contact with the bottom surface of the notch inside the stepped portion.
14. The gear transmission according to claim 13, wherein a convex portion protruding in an axial direction parallel to relative rotation with the case and the carrier is formed on the rising surface.
A seal for preventing leakage of lubricating oil from between the case and the carrier, which is used in an apparatus body having a case and a carrier including at least one gear that is rotatable relative to the case. A device,
An oil seal for preventing leakage of the lubricating oil provided between the case and the carrier;
A foreign matter capturing member provided inside the oil seal,
The foreign matter capturing member has a holder fixed to the apparatus main body or the oil seal, and a filter material that is held by the holder and through which the lubricating oil can pass.
The said filter material is the sealing device which has comprised the front-end | tip slidable contact part of the said foreign material capture member which slidably contacts either the said apparatus main body or the said oil seal with relative rotation with the said case and the said carrier.