JP6131182B2 - Power transmission device - Google Patents

Description

  The present invention relates to a power transmission device.

  Patent Document 1 discloses a power transmission device applied to a yaw drive device of a wind power generation facility. The power transmission device includes a casing that is fixed on the nacelle side and houses a speed reduction mechanism, an output shaft that transmits power to the speed reduction mechanism and protrudes from the casing, and an output pinion provided on the output shaft outside the casing. I have. Grease is enclosed in the casing, and a seal member is provided between the casing and the output shaft.

  The output pinion provided on the output shaft meshes with a turning gear fixed on the tower side of the wind power generation facility. When the rotation of the motor is decelerated by the decelerating mechanism and the pinion is rotated by decelerating and rotating the output shaft, the pinion revolves with respect to the axis of the swivel gear. Thereby, the nacelle to which the casing of the power transmission device is fixed turns with respect to the tower to which the turning gear is fixed.

JP 2010-216355 A (FIGS. 1 and 6)

  In the power transmission device having such a configuration, when the internal pressure in the casing rises, the grease enclosed in the casing may leak. For example, the leaked grease enters the motor, the brake, or the like. Then, there existed a problem of becoming the cause of generation | occurrence | production of a malfunction.

  The present invention has been made to solve such a problem, and an object of the present invention is to obtain a power transmission device that can suppress the occurrence of problems due to leakage of grease.

The present invention includes a casing that houses the transmission mechanism and encloses grease, a transmission shaft that transmits power to the transmission mechanism and protrudes from the casing, a pinion provided on the protrusion shaft outside the casing, A power transmission device including a seal member provided between the casing and the projecting shaft, wherein when the pressure in the casing rises, the grease leaks to the periphery of the pinion outside the casing. A leakage mechanism, and the leakage mechanism includes a leakage passage formed in the projecting shaft, the leakage passage having one end opened inward of the seal member and the other end outside the seal member. open to, the該漏exit passageway, a closing member for closing the leak passage mounting portion capable of mounting is provided, wherein the leakage path, a second communicating with the first passage, said first passage The first passage includes an entry opening that opens to the inside of the casing, a first exit opening that opens to the outside of the casing, and the mounting portion, and the second passage. Includes a second outlet opening that opens to the outside of the casing and communicates with the first passage on the outer side of the mounting portion, and the closing member passes through the first outlet opening. The above- described problem is solved by adopting a configuration in which a lid member that can be attached to the attachment portion and can close the first exit opening is provided in the first exit opening. .

  In the present invention, grease is not configured not to leak even if the internal pressure in the casing rises, but leakage is allowed when the internal pressure rises, and instead, the leakage destination is around a pinion that does not cause a problem. Such a configuration was adopted.

  ADVANTAGE OF THE INVENTION According to this invention, the power transmission device which can suppress generation | occurrence | production of the malfunction by the leakage of grease can be obtained.

Sectional drawing including a partial enlarged view in part of a reduction gear for a yaw drive device of a wind power generation facility according to an example of an embodiment of the present invention Sectional drawing along the II-II line of the speed reducer of FIG. 1 is a cross-sectional view taken along the line III-III of the speed reducer of FIG. Overall schematic diagram of the yaw drive device of the wind power generation facility Sectional drawing for demonstrating the air leak test of the said reduction gear Sectional drawing of the speed reducer which concerns on an example of other embodiment of this invention.

  Hereinafter, an example of an embodiment of the present invention will be described in detail based on the drawings.

  FIG. 1 is a cross-sectional view partially including a partially enlarged view of a reduction device for a yaw drive device of a wind power generation facility to which an example of an embodiment of the present invention is applied, and FIGS. It is sectional drawing which follows the -II line and the III-III line. FIG. 4 is an overall schematic diagram of the yaw drive device of the wind power generation facility. FIG. 1 shows a normal use state, and FIG. 5 shows a state when an air leak test (described later) is performed on the reduction gear of FIG.

  Referring to FIG. 4, this yaw drive device 14 includes a plurality of motors M1 and reduction gears G1 (power transmission devices) (four in the example of FIG. 4). The reduction gear G1 is fixed to the nacelle 16 side of the wind power generation facility 12 and has an output pinion 18. The output pinion 18 meshes with a turning gear 22 fixed to the tower 20 side of the wind power generation facility 12.

  When the output pinion 18 of the reduction gear G1 is rotated by the motor M1, the output pinion 18 revolves around the axis O1 of the turning gear 22 while meshing with the turning gear 22 fixed to the tower 20 side. By this revolution, the entire nacelle 16 to which the reduction gear G1 is fixed can be turned around the axis O1. Thereby, the nose cone 23 can be directed in a predetermined direction (for example, the windward direction), and the wind pressure can be efficiently received.

  In addition, the code | symbol 24 of FIG. 4 is a pitch drive device. The pitch driving device 24 also includes a reduction gear G2 with an output pinion 25. When the output pinion 25 meshes with the internal gear 26, the angle of the windmill blade 27 can be changed.

  Here, the speed reducer G1 of the yaw drive device 14 to which an example of the embodiment of the present invention is applied will be described in detail with reference to FIGS. First, the reduction mechanism (transmission mechanism) 28 of the reduction gear G1 will be described.

  A joint shaft 30 is connected to the motor shaft 29 of the motor M1. An input pinion 31 is directly cut at the tip of the joint shaft 30. The input pinion 31 meshes with a plurality of (three in this embodiment) eccentric body shaft gears 32 at the same time. Each eccentric body shaft gear 32 is connected to an eccentric body shaft 36 through a spline 34. The eccentric body shafts 36 are supported by first and second carriers 38 and 40, which will be described later, via tapered roller bearings 41 and 42, respectively.

  First and second eccentric bodies 44 and 46 are integrally formed on the eccentric body shaft 36. First and second external gears 52 and 54 are incorporated on the outer circumferences of the first and second eccentric bodies 44 and 46 via first and second rollers 48 and 50. The eccentric phase of the first eccentric body 44, the first roller 48, and the first external gear 52 is shifted by 180 degrees from the eccentric phase of the second eccentric body 46, the second roller 50, and the second external gear 54. . FIG. 3 shows a cross section on the second external gear 54 side, but the first external gear 52 side has the same configuration as FIG. 3 except that the eccentric phase is shifted by 180 degrees.

  Both the first and second external gears 52 and 54 are in mesh with the internal gear 56. In this embodiment, the internal gear 56 is rotatably supported by the internal gear main body 56A integrated with the casing main body 58A of the casing 58, and the internal gear main body 56A. It is comprised with the outer pin 56B to comprise. The number of internal teeth of the internal gear 56 (the number of external pins 56B) is slightly larger (only 1 in this example) than the number of external teeth of the first and second external gears 52 and 54.

  In this embodiment, the casing 58 includes a casing body 58A functioning as the internal gear body 56A, an input side casing body 58B disposed on the axial motor M1 side of the casing body 58A, and the casing body. It is comprised with the output side casing body 58C arrange | positioned at the output pinion 18 side of 58A.

  First and second carriers 38 and 40 are disposed on both axial sides of the first and second external gears 52 and 54. The first and second carriers 38 and 40 are connected to each other via a carrier pin 64 that is integrally projected from the second carrier 40 side and a carrier bolt 66 that is inserted from the first carrier 38 side. The first carrier 38 is rotatably supported on the casing main body 58 </ b> A via a roller bearing 68. The second carrier 40 is integrated with an output shaft 70 (a protruding shaft in the present invention), and the output shaft 70 is connected to the casing main body 58A via a self-aligning roller bearing 72 (and indirectly the roller bearing 68). It is supported. The output shaft 70 protrudes out of the casing 58 from the casing 58, specifically, the output-side casing body 58C. The output pinion 18 is connected to the output shaft 70 via a spline portion 74 outside the casing 58. The output pinion 18 is prevented from coming off the output shaft 70 in the axial direction by the presser body 76 and the bolt 78.

  The output pinion 18 meshes with the swivel gear 22 (fixed on the tower 20 side). In this embodiment, the turning gear 22 is constituted by an internal gear, and the output pinion 18 is in mesh with the turning gear 22. However, the turning gear may be constituted by an external gear, and the output pinion may be externally meshed with the turning gear. That is, the pinion according to the present invention may be a pinion that internally meshes with the counterpart gear, or a pinion that meshes externally.

  Grease is applied to the meshing portion 80 between the output pinion 18 and the turning gear 22.

  Here, the structure related to the sealing and leakage of grease will be described in detail.

  In this embodiment, the speed reduction mechanism 28 of the speed reduction device G1 is accommodated in the casing 58 and is lubricated by grease. Therefore, two input-side oil seals 84 are arranged side by side as seal members between the joint shaft 30 and the input-side casing body 58B of the casing 58.

  On the output side of the reduction gear G1, a ring body 82 is press-fitted into the output shaft 70 adjacent to the self-aligning roller bearing 72. Two output side oil seals 86 are arranged side by side as seal members between the ring body 82 and the output side casing body 58 </ b> C to prevent leakage of grease to the outside of the casing 58.

  A greasing port 88 is disposed on the outer periphery of the input-side casing body 58B. A grease nipple 90 is detachably disposed at the greasing port 88. Detailed specifications for grease nipples are defined in Japanese Industrial Standards (JIS). In this embodiment, a grease nipple 90 of a sealed type with a lid (a type that allows air to pass but does not allow grease to pass through) is disposed. Further, a fat drain port 91 is disposed on the outer side of the casing 58 in the radial direction of the second carrier 40 of the casing main body 58A. An obturator plug 92 is fitted in the fat drain port 91. The obturator plug 92 is a completely sealed seal member that does not allow grease or air to pass through. In addition, when performing the air leak test mentioned later, this grease supply port 88 is utilized as an air injection port.

  The casing 58 of the reduction gear G1 incorporates these seal members 84, 86, 90, 92, and the connecting surfaces of the casing main body 58A, the input side casing body 58B, and the output side casing body 58C are liquid packing. It is sealed. And the grease is enclosed in the internal space P1 of the casing 58 in a substantially full state. These sealing members 84, 86, 90, 92 and liquid packing have a sealing function that prevents grease from leaking out when the internal pressure of the reduction gear G1 is in a steady state.

Here, the internal pressure is in a steady state when the wind power generation equipment 12 is operated in a non-operating state or at a rated power output or less at a normal temperature (at a high temperature of 20 ° C. ± 15 ° C. (5-35 ° C.): JISZ8703). The state that is. Specifically, the internal pressure is approximately 0.03 kg / cm ^{2 to} 0.1 kg / cm ^2, so that the grease is not leaked.

  The reduction gear G1 according to this embodiment includes a leakage mechanism 94 that leaks grease to the periphery of the output pinion 18 outside the casing 58 when the internal pressure in the casing 58 of the reduction gear G1 increases. Here, “leaking the leaked grease around the output pinion 18 outside the casing 58” means “leaving around the pinion where there is no problem even if grease already exists and the grease leaks”. Thus, it does not matter whether the leaked grease contributes to the lubrication of the pinion.

  The leakage mechanism 94 has a leakage passage 96 formed in the output shaft 70. One end of the leak passage 96 opens to the inside of the output side oil seal 86, and the other end opens to the outside of the output side oil seal 86. The leakage passage 96 is mainly composed of a first passage 101 and a second passage 102 communicating with the first passage 101.

  The first passage 101 of the leakage passage 96 is formed along the axial direction at the radial center of the output shaft 70. The first passage 101 includes an inlet side opening 101E that opens to the inside of the casing 58 on one (one end) side, that is, on the speed reduction mechanism side (inside the output side oil seal 86) than the output side oil seal 86. Specifically, the entry-side opening 101E opens at the speed reduction mechanism-side end surface of the second carrier 40. Further, on the other (other end) side, that is, on the side opposite to the deceleration mechanism from the output side oil seal 86 (outside from the output side oil seal 86), the mounting portion 101W and the outside of the casing 58 (specifically, the output shaft). And a first outlet opening portion 101A that opens to the tip end surface of the main body 70.

  A closing member 104 (see FIG. 5: not attached in FIG. 1) that closes the leakage passage 96 (specifically, the first passage 101) can be attached to the attachment portion 101W of the first passage 101. . Specifically, the mounting portion 101W of the first passage 101 is configured by mounting portion screws (female screws) 101Ws formed on the inner periphery of the mounting portion 101W. As shown in FIG. 5, the closing member 104 has a taper screw (male thread) 104 s that is screwed into the mounting portion screw 101 Ws, and the mounting portion 101 </ b> W through the first outlet opening 101 </ b> A of the first passage 101. The mounting portion screw 101Ws can be screwed and mounted. For this reason, the inner diameter D101A of the first outlet opening 101A is set larger than the outer diameter d104 of the closing member 104 (D101A> d104). The closing member 104 is removed from the mounting portion 101W during normal use (state shown in FIG. 1), and is attached to the mounting portion 101W only when an air leak test described later is performed (state shown in FIG. 5).

  Referring to FIG. 1, the first outlet side opening 101 </ b> A of the first passage 101 opens at the tip surface of the output shaft 70. The first outlet opening 101A is detachably provided with a lid member 106 that can close the first outlet opening 101A. Specifically, an opening screw (female screw) 101As is formed on the inner periphery of the first outlet opening 101A, and the lid member 106 is a taper screw (male screw) that is screwed to the opening screw 101As. 106s is formed. The lid member 106 can close the first outlet opening 101A by screwing the taper screw 106s of the lid member 106 into the opening screw 101As of the first outlet opening 101A. The lid member 106 of the first outlet opening 101A is removed when the closing member 104 is mounted on the mounting portion 101W in order to perform an air leak test, and is mounted during normal use of the reduction gear G1.

  On the other hand, the second passage 102 of the leakage passage 96 is branched from the first passage 101 and formed along the radial direction of the output shaft 70. The second passage 102 is on the side opposite to the speed reduction mechanism of the mounting portion 101W of the first passage 101 (external side of the mounting portion 101W: in this example, between the mounting portion 101W of the first passage 101 and the first outlet opening 101A. ) And a second outlet opening 102A that opens to the outside of the casing 58. More specifically, the second outlet opening 102 </ b> A opens on the side surface of the output shaft 70. That is, in the present embodiment, as described above, the output pinion 18 is connected to the output shaft 70 via the spline portion 74, and the second output side opening portion 102 </ b> A opens to the spline portion 74. . The second passage 102 is specifically formed by inserting a drill into the output shaft 70 from the outermost peripheral side of the spline portion 74 of the output shaft 70 and communicating with the first passage 101.

  The inner diameter D102A of the second outlet opening 102A of the second passage 102 is shown to be large for convenience in FIG. 1, but in actuality, when the internal pressure in the casing 58 is about to exceed the allowable value, In addition, the size is set such that grease starts to leak into a slight gap of the spline portion 74 via the second outlet opening 102A. In this embodiment, only one second passage 102 (second outlet opening 102A) is formed, but a plurality of second passages 102 (second outlet openings 102A) may be formed at predetermined intervals in the circumferential direction. .

  With these configurations, in the present embodiment, after all, one (one end) side of the leakage passage 96 is in the casing via the inlet-side opening 101E of the first passage 101 that opens to the inner side of the output-side oil seal 86. 58 is opened inside. The other (other end) side of the leakage passage 96 communicates with the first passage 101 on the first passage 101 (with the closing member 104 removed) and on the outer side of the attachment portion 101W. The second opening 102A of the second passage 102 is open to the outside of the output side oil seal 86 through the second outlet opening 102A. In other words, the first passage 101 communicates with the second outlet opening 102A of the second passage 102 with respect to the leakage of grease, but is different from the second outlet opening 102A for the purpose of leakage. The first outlet opening 101A is also in communication. As a result, the closing member 104 that can close the first passage 101 (and thus the leakage passage 96) can be attached to the attachment portion 101W via the first outlet opening 101A.

  Next, the operation of the speed reducer G1 will be described.

  When the joint shaft 30 is rotated by rotating the motor shaft 29 of the motor M1, the input pinion 31 formed at the tip of the joint shaft 30 is rotated, and the three eccentric body shaft gears 32 are simultaneously rotated in the same direction. . As a result, the three eccentric body shafts 36 are synchronously rotated in the same direction, and the first external gear 52 is swung via the first eccentric body 44 and the first roller 48, and the second eccentric body 46, The second external gear 54 swings through the second roller 50. Since the first and second external gears 52 and 54 are engaged with the internal gear 56 while swinging, the first and second external gears 52 and 54 each time the eccentric body shaft 36 rotates once. Oscillates once and is out of phase (rotates) by one tooth with respect to the internal gear 56 in a fixed state. The rotation components of the first and second external gears 52 and 54 are transmitted to the first and second carriers 38 and 40 as the revolution of the eccentric body shaft 36. Then, the output shaft 70 integrated with the second carrier 40 rotates, and the output pinion 18 connected to the output shaft 70 via the spline portion 74 rotates. Since the output pinion 18 revolves around the axis O1 of the swivel gear 22 fixed to the tower 20 side (FIG. 4), as a result, the nacelle 16 to which the casing 58 of the speed reducer G1 is fixed becomes the tower 20 It turns relative to.

  In the following, the operation relating to the structure related to the sealing and leakage of grease will be described in particular.

  If it is designed so that grease does not leak from the casing 58 even if the internal pressure rises, a large internal pressure is directly applied to all the sealing members 84, 86, 90, 92 sealing the inside and outside of the casing 58. End up. Therefore, the durability of these seal members 84, 86, 90, 92 is reduced and the life is shortened. In particular, in the case of a sealing member that seals a shaft that rotates relative to the casing 58, such as the input-side oil seal 84 or the output-side oil seal 86, the sealing characteristics can be improved. The higher the value, the greater the power transmission loss. Furthermore, since the power transmission loss is increased, heat is more likely to be generated, and the durability of the input side oil seal 84 having a particularly high rotational speed is likely to be further reduced. Since the input-side oil seal 84 is an important seal member that prevents leakage of grease to the motor M1 side, the fact that the deterioration is quick is a great demerit.

  In the present embodiment, none of such problems occur.

  First, grease is almost completely filled in the casing 58, but the input side oil seal 84, the output side oil seal 86, the grease nipple 90 of the greasing port 88, and the closing plug 92 of the greasing port 91 are filled. Each of the seal members and the leakage mechanism 94 are sealed so as not to leak grease when the internal pressure is in a steady state, that is, when the wind power generation equipment 12 is not operating at normal temperature or is operating at a rated power output or less. Characteristics are ensured. Therefore, when the internal pressure is in a steady state, grease does not leak from the seal members 84, 86, 90, 92 or the leakage mechanism 94, and of course, the greasing port 88 and the greasing port 91 are located on the motor M1 side. No leakage of grease occurs in the vicinity of or near the output side oil seal 86.

  On the other hand, when the internal pressure in the casing 58 rises and approaches the upper limit of the steady state, the seal members 84, 86, (in particular, by setting the diameter of the second outlet opening 102A of the second passage 102). Before the leakage of the grease starts from 90 and 92, the leakage of the grease by the leakage mechanism 94 is automatically started.

  More specifically, as the internal pressure increases, the grease in the casing 58 enters the first passage 101 of the leakage passage 96 from the inlet side opening 101E on one end side of the leakage passage 96. Since the first outlet opening 101A of the first passage 101 is closed by the lid member 106, the grease that has entered the first passage 101 is attached to the mounting portion 101W (with the closing member 104 removed), and the It leaks to the outside of the casing 58 through the second outlet side opening 102A of the second passage 102 communicating with the first passage 101 on the outer side of the mounting portion 101W. Since the second outlet opening 102 </ b> A is opened to the spline part 74 to which the output shaft 70 and the output pinion 18 are connected, the leaked grease is supplied to the spline part 74. Since the first outlet opening 101A of the first passage 101 is closed by the lid member 106, grease does not leak from the first outlet opening 101A. That is, the grease leaked from the inside of the casing 58 leaks exclusively from the second outlet side opening 102A and contributes to the lubrication of the spline portion 74.

  The output pinion 18 is originally sufficiently coated with grease to lubricate the meshing portion 80 with the swivel gear 22, and a large amount of grease exists in the vicinity of the output pinion 18. Therefore, even if the grease in the casing 58 leaks slightly, there is no demerit even though there are merits such as better lubrication of the spline portion 74.

  Further, due to the leakage of grease through the leakage passage 96, the internal pressure in the casing 58 is suppressed from rising further. Therefore, the input side oil seal 84, the output side oil seal 86, the grease nipple 90, and the sealing plug 92 can sufficiently perform their original sealing functions under a steady state internal pressure at all times. it can. In other words, it is sufficient that the seal members 84, 86, 90, and 92 have a characteristic that can be reliably sealed when the internal pressure is in a steady state. For this reason, in particular, an oil seal that seals between the casing 58 and the joint shaft 30 or the output shaft 70 that is a rotating shaft, such as the input-side oil seal 84 or the output-side oil seal 86, is excessive. Since there is no need to increase the sealing characteristics, power transmission loss can be reduced. Moreover, since the temperature rise of the sliding contact part of the input side oil seal 84 or the output side oil seal 86 can also be suppressed, deterioration can be suppressed and high sealing performance including leakage to the motor M1 side that dislikes the inflow of grease. Can be maintained over a long period of time.

  Here, the air leak test will be described in detail.

  As a cause of the leakage of the grease in the reduction gear G1, there is a problem with the input side oil seal 84 and the output side oil seal 86. Problems with the input-side oil seal 84 and the output-side oil seal 86 may gradually progress with use. However, when the speed reducer G1 is assembled, it may not be installed in a proper contact state, or the member itself may be removed during installation. It may occur due to so-called initial failure due to damage. For this reason, in this reduction gear G1, in order to prevent the grease leakage due to the initial failure of the oil seal, an inspection called “air leak test” is performed.

  In this embodiment, the above-described grease supply port 88 also serves as an air injection port 89 for injecting air (for performing this air leak test). That is, as shown in FIG. 5, in the air leak test, the grease nipple 90 of the grease supply port 88 is removed and the grease supply port 88 is used as the air injection port 89, and the air leak detection unit 110 is installed here. Done by connecting.

  More specifically, air output from an air pump (not shown) is reduced to a predetermined pressure by the pressure reducing valve 110A of the air leak detection unit 110, and the compressed air thus reduced is supplied from the air inlet 89 to the casing 58 of the speed reduction device G1. Injected into. Thereby, the inside of the casing 58 of the reduction gear G1 is raised to an air pressure equivalent to the injected compressed air. In this state, the injection of compressed air is stopped and the valve 110B is closed and left until a predetermined time has elapsed, and the pressure after the predetermined time is detected by the pressure gauge 110C. When the sealing mechanisms such as the input-side and output-side oil seals 84 and 86 are functioning normally, the pressure of the compressed air in the reduction gear G1 hardly decreases even after a predetermined time has elapsed. can not see. Therefore, it can be confirmed that the sealing mechanism is functioning normally by detecting that the pressure drop is less than the predetermined value.

  However, the reduction gear G1 according to the above configuration includes the leakage mechanism 94 that automatically leaks grease when the internal pressure in the casing 58 increases to a predetermined value or more. Therefore, air is leaked from the leakage passage 96 of the leakage mechanism 94 when performing this air leak test (by simply having a structure capable of leaking grease), and the air leak test itself cannot be performed properly. A malfunction will occur.

  Therefore, in the above embodiment, as shown in FIG. 5, before the air leak test is performed, the closing member 104 is attached to the attachment portion 101 </ b> W of the first passage 101 to close the first passage 101. Since the inner diameter D101A of the first outlet opening 101A is larger than the outer diameter d104 of the closing member 104, the closing member 104 is inserted into the first passage 101 through the first outlet opening 101A, and the first passage The taper screw 104s of the closing member 104 can be screwed into the mounting portion screw 101Ws of the mounting portion 101W of 101.

  Since the second passage 102 communicates with the first passage 101 on the outer side of the mounting portion 101W, air in the air leak test leaks through the leakage passage 96 when the closing member 104 is attached to the mounting portion 101W. Can be prevented. In other words, if air leaks in the air leak test performed in this state, it is considered that there is a problem with one of the seal members that should not leak. It can be fixed or exchanged.

  After the air leak test is completed, the closing member 104 is removed from the mounting portion 101W through the first outlet opening 101A, and the taper screw 106s of the lid member 106 is attached to the opening screw 101As of the first outlet opening 101A. The first outlet opening 101 </ b> A is closed by the lid member 106. Accordingly, the state shown in FIG. 1 can be obtained, and the grease in the casing 58 can be appropriately leaked only from the second outlet opening 102A through the second passage 102 by the above-described action. In this embodiment, the lid member 106 is detachably provided in the first exit side opening 101A. However, the lid member 106 is not necessarily detachable. It may be a lid member that cannot be removed.

  In the above embodiment, the output pinion 18 is connected to the output shaft 70 via the spline portion 74, and the second outlet side opening portion 102 </ b> A of the second passage 102 is open to the spline portion 74. In this case, not only the second outlet opening 102A is opened to the spline part 74 but also the teeth (output shaft) of the spline part 74 at the axial position where the second outlet opening 102A is opened. A configuration in which the teeth on the 70 side and the teeth on the output pinion 18 side) are notched in the circumferential direction may be employed. Thereby, the leaked grease can be more smoothly spread over the entire spline portion 74, and the spline portion 74 can be lubricated more efficiently.

  Further, instead of forming the notch, or together with the formation of the notch, as shown in FIG. 6, the output shaft 70 and the output pinion are positioned at the axial position where the second outlet opening 102A is open. A groove 18A that makes one round in the circumferential direction may be formed in at least one of the eighteen (the output pinion 18 in the example of FIG. 6). Thereby, the leaked grease can be more smoothly spread over the entire spline portion 74, and the spline portion 74 can be lubricated more efficiently.

  In the above embodiment, as the leakage passage 96, the first passage 101 is formed in the radial center of the output shaft 70 along the axial direction, and the second passage 102 is formed along the radial direction. The second exit side opening portion 102 </ b> A of the two passages 102 is opened at the spline portion 74 between the output pinion 18 and the output shaft 70. However, the form of formation of the leakage passage according to the present invention is not limited to this.

  For example, the second outlet opening of the second passage is a space that is closed when the members come into contact with each other without using a seal member such as a liquid packing or an O-ring (instead of opening to the spline portion), for example, 6, a configuration may be adopted in which an opening is made in the space S1 between the ring body 82 and the output pinion 18, the space S2 between the output pinion 18 and the pressing body 76, or the like. These spaces S1 and S2 are usually designed so that the members are brought into contact with each other via a sealing member such as a liquid packing and the grease does not leak out. However, these spaces S1, S2, etc. can be made to contact the second exit side of the second passage by intentionally bringing the members into contact with each other without using a seal member (or by intentionally forming a slight gap or groove). It can function as an opening.

  This configuration is effective, for example, in a configuration in which the output shaft 70 and the output pinion 18 are integrated from the beginning as one member (not by spline connection). In the case where the output shaft 70 and the output pinion 18 are integrated as a single member from the beginning, there is no spline portion itself, and naturally, the spline portion need not be lubricated. Therefore, the grease leaked out by this configuration is added as a part of the large amount of grease originally present between the output pinion 18 and the swivel gear 22.

  In short, one end of the leakage passage opens to the inside of the seal member (output-side oil seal 86) of the protruding shaft (output shaft 70 in the previous example), and the other end opens to the outside of the seal member. For example, the opening at the other end may function as the leakage passage of the present invention even when the opening is apparently located on the radially inner side of the casing. In other words, when the storage space and the external space of the transmission mechanism are separated by the seal member, it can be said that one end of the leakage passage opens into the storage space of the transmission mechanism and the other end opens into the external space.

  In the above embodiment, an example in which the present invention is applied to a reduction gear (power transmission device) of a yaw drive device of a wind power generation facility has been shown. However, as described above, the present invention is also applied to a pitch drive device. Since a reduction gear having an output pinion is used, the present invention can also be applied to a pitch driving device, and the same effect can be obtained. In the first place, the use of the power transmission device of the present invention is not particularly limited to the use of a reduction device for wind power generation equipment, and can be applied to, for example, a reduction device for turning a construction machine.

  In the above-described embodiment, the power transmission device that employs the eccentric oscillating type reduction mechanism having a plurality of eccentric body shafts at positions radially away from the axis of the reduction mechanism has been shown. The configuration of the power transmission device according to the present invention is not limited to this configuration. For example, an eccentric oscillating speed reduction mechanism of a type having one eccentric body shaft at the radial center of the speed reduction mechanism. It may be.

  Furthermore, it is not always necessary to have an eccentric oscillating speed reduction mechanism, and the present invention can be applied to other various speed reduction mechanisms, and need not be a speed reduction mechanism in the first place. That is, a power transmission device having a speed increasing mechanism may be used. In this respect, the present invention can also be regarded as a “power transmission device having a speed change mechanism”. However, the term “shift” in this case is used as a general concept of deceleration and acceleration, and does not necessarily mean that the rotational speed of the output shaft is variable.

  Moreover, in the said embodiment, although the pinion was provided in the output shaft (protrusion shaft), the protrusion shaft which concerns on this invention should just be a protrusion shaft which protrudes from a casing and a pinion is provided outside a casing, for example, It may be an input shaft. As already described, the pinion may be configured separately from the protruding shaft, or may be configured integrally.

G1 ... Deceleration device (power transmission device)
16 ... Nacelle 18 ... Output pinion 22 ... Swivel gear 28 ... Deceleration mechanism (transmission mechanism)
58 ... Casing 70 ... Output shaft 84 ... Input side oil seal 86 ... Output side oil seal 94 ... Leakage mechanism 96 ... Leakage passage 101 ... First passage 101A ... First exit side opening 101W ... Mounting portion 102 ... Second passage 102A ... 2nd exit side opening 104 ... Closure member 106 ... Cover member 110 ... Air leak detection unit

Claims (4)

A casing that houses the transmission mechanism and encloses grease, a projection shaft that transmits power to the transmission mechanism and projects from the casing, a pinion provided on the projection shaft outside the casing, the casing and the projection A power transmission device comprising a seal member provided between the shaft and
A leakage mechanism that leaks the grease to the periphery of the pinion outside the casing when the pressure in the casing rises;
The leakage mechanism includes a leakage passage formed in the protruding shaft,
The leakage passage has one end opened inside the seal member and the other end opened outside the seal member .
The leakage passage is provided with a mounting portion capable of mounting a closing member for closing the leakage passage ,
The leakage passage includes a first passage and a second passage communicating with the first passage,
The first passage includes an entry-side opening that opens to the inside of the casing, a first exit-side opening that opens to the outside of the casing, and the mounting portion.
The second passage includes a second outlet opening that communicates with the first passage on the outside of the mounting portion and opens to the outside of the casing.
The closing member is attachable to the attachment part through the first outlet opening; and
A power transmission device , wherein a lid member capable of closing the first outlet opening is provided in the first outlet opening . In claim 1 ,
The first outlet opening opens at a tip surface of the protruding shaft,
The second outlet opening opens on a side surface of the protruding shaft;
An inner diameter of the first outlet opening is larger than an outer diameter of the closing member. In claim 1 or 2 ,
The pinion is connected to the protruding shaft via a spline portion;
The second outlet opening is open to the spline; and
The power transmission device, wherein teeth of the spline portion are cut away in a circumferential direction at an axial position where the second outlet opening is opened. In claim 1 or 2 ,
The second output-side opening is opened in a closed space when the members come into contact with each other without a seal member interposed therebetween.

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