JP2018128133A - Oil supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil supply system which can unfailingly prevent air bubbles from mixing into oil when supplying the oil to an oil use device in a circulation manner.SOLUTION: A lubrication oil supply system 2a has: a device housing chamber 3 which houses a gear device 1; a lubrication oil storage tank 14 which stores a lubrication oil; a hydraulic pump 19 which pumps the lubrication oil in the lubrication oil storage tank 14 to the device housing chamber 3; a lubrication oil guide passage 21 which guides the lubrication oil discharged from the hydraulic pump 19 to the device housing chamber 3; a lubrication oil reflow passage 15 which reflows the lubrication oil in the device housing chamber 3 to the lubrication oil storage tank 14; a lubrication oil introduction passage 22 which introduces the lubrication oil in the lubrication oil storage tank 14 into the hydraulic pump 19; and a vacuum pump 28 which exhausts air from the device housing chamber 3 and the lubrication oil storage tank 14. A connection part between the device housing chamber 3 and the lubrication oil reflow passage 15 is disposed at a position higher than the lubrication oil storage tank 14, and a connection part between the lubrication oil storage tank 14 and the lubrication oil introduction passage 22 is disposed at a position higher than an oil chamber 25 of the hydraulic pump 19.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an oil supply system that supplies oil while being circulated to an oil use device that is wetted by or immersed in oil such as lubricating oil.

  In general, in an oil supply system in which oil in an oil storage tank is supplied to an oil using device by a hydraulic pump and then returned to the oil storage tank for circulation, air bubbles are inevitably mixed into the circulating oil. The same problem also occurs in an oil supply system that does not provide an oil storage tank and recirculates and circulates oil discharged from the oil using device to the oil using device using a hydraulic pump. If air bubbles are mixed in the circulating oil in this way, the hydraulic pump is damaged by cavitation, the oil temperature rises due to adiabatic compression of the bubbles in the hydraulic pump, the vibration of the hydraulic pump and oil passage, or the generation of noise. Such a problem occurs. Furthermore, since the oil deteriorates due to oxidation, it is necessary to change the oil relatively frequently. Therefore, various bubble removing means have been proposed in which bubbles in the oil are floated and released into the air before the circulating oil is sucked into the hydraulic pump (see, for example, Patent Documents 1 to 3).

JP 2005-171921 A JP 2013-192990 A JP 2014-173721 A

  However, while the bubbles mixed in the oil are fine, the viscosity of the oil is generally high, so the rising speed or the rising speed of the bubbles in the oil is small. In order to release the bubbles in the oil to the atmosphere by the bubble removing means A considerable residence time is required. For this reason, there is a problem that the amount of oil staying in the bubble removing means increases and the oil supply system needs to hold a large amount of oil. There is also a problem that it is very difficult to remove particularly fine bubbles in the oil. Furthermore, there is a problem that in the upstream portion of the bubble removal means with respect to the flow direction of the oil, bubbles are mixed in the oil, so that the oxidation of the oil cannot be sufficiently prevented.

  The present invention has been made in order to solve the above-described conventional problems, and when bubbles are supplied to an oil use apparatus that is wetted or immersed in oil while being circulated, It is an object to be solved to provide an oil supply system that can reliably prevent mixing.

  Oil to circulate and supply oil to an oil use apparatus wetted or immersed in oil (for example, lubricating oil, hydraulic oil, etc.) according to the first aspect of the present invention made to solve the above-mentioned problems The supply system includes a sealed device storage chamber, a sealed oil storage tank, a hydraulic pump, an oil guide passage (oil transport passage), an oil return passage, an oil introduction passage, and a vacuum source (for example, a vacuum pump). ).

  Here, the device housing chamber having a sealed structure houses an oil using device therein. The oil storage tank stores oil to be supplied to the oil using device. The hydraulic pump supplies (pumps) the oil stored in the oil storage tank to the device storage chamber. The oil guide passage is connected to the oil discharge port of the hydraulic pump and the device storage chamber, and guides (transports) the oil discharged from the hydraulic pump to the device storage chamber. The oil recirculation passage is connected to the apparatus storage chamber and the oil storage tank, and causes oil remaining in the lower part (lower end part or near the lower end) or the bottom part of the apparatus storage chamber to return to the oil storage tank. The oil introduction passage is connected to the oil storage tank and the oil suction port of the hydraulic pump, and introduces the oil stored in the oil storage tank to the hydraulic pump. The vacuum source sucks and exhausts the air in the apparatus housing chamber and the air in the oil storage tank through the exhaust passage.

  In this oil supply system, the connection portion (communication portion) between the device storage chamber and the oil recirculation passage is disposed at a position higher than the upper end portion of the oil storage tank. Further, the connecting portion (communication portion) between the oil storage tank and the oil introduction passage is disposed at a position higher than the upper end portion of the hydraulic pump or the upper end portion of the oil chamber of the hydraulic pump.

  An oil supply system according to a second aspect of the present invention is the oil supply system according to the first aspect of the present invention, wherein the oil storage tank is bypassed and connected to the oil return passage and the oil introduction passage. An oil storage tank bypass passage is further provided. A first opening / closing valve is provided in the oil storage tank bypass passage, and a second opening / closing valve is provided in the oil return passage at a position closer to the oil storage tank than the connection with the oil storage tank bypass passage. A third on-off valve is interposed in the oil introduction passage at a position closer to the oil storage tank than the connecting portion.

  An oil supply system according to a third aspect of the present invention is the oil supply system according to the first aspect of the present invention, in which the oil storage tank and the oil recirculation passage are removed, while the oil introduction passage is provided at a lower portion of the apparatus housing chamber or It is connected to the bottom and the oil suction port of the hydraulic pump, and is configured to introduce the oil staying in the lower part or the bottom of the apparatus housing chamber into the hydraulic pump. The vacuum source is configured to exhaust the air in the device housing chamber through the exhaust passage, and the connection portion between the device housing chamber and the oil introduction passage is higher than the upper end portion of the hydraulic pump or the oil chamber of the hydraulic pump. Placed in position.

  In the oil supply system according to the first to third aspects of the present invention, as the oil use device, for example, a gear device in which a plurality of gears (gears) mesh with each other and the meshing portion of the gears is lubricated with lubricating oil (oil). Etc. Specifically, a speed reducer or speed increasing device that decelerates or increases the torque of the input shaft and outputs it to the output shaft can be used. In this case, it is preferable that a lubricating oil supply device (nozzle or the like) connected to the oil guide passage and spraying or flowing down the lubricating oil to the gear device is disposed in the apparatus housing chamber.

  In the oil supply system according to the first to third aspects of the present invention, the air in the apparatus housing chamber is sucked by the vacuum source (in the oil supply system according to the first to second aspects, the air in the oil storage tank). -All parts that are evacuated and through which oil flows in the oil supply system are maintained in a substantially vacuum state. Therefore, since air or air bubbles do not exist in the space in the oil supply system or in the oil in the space, air bubble removing means for removing air bubbles in the oil as in the conventional oil supply system of this type is provided. There is no need to provide it. For this reason, there is no problem caused by mixing of bubbles in the oil. Therefore, when the oil is supplied to the oil use device that is wetted or immersed in the oil while being circulated, it is possible to reliably prevent bubbles from entering the oil and to ensure that the oil has deteriorated due to oxidation. Can be prevented.

1 is a partially sectional elevational view schematically showing a configuration of a lubricating oil supply system (oil supply system) according to a first embodiment of the present invention. It is a partial cross section elevation which shows typically the composition of the lubricant supply system (oil supply system) concerning the modification of the 1st embodiment of the present invention. It is a partial cross section elevation which shows typically the composition of the lubricating oil supply system (oil supply system) concerning a 2nd embodiment of the present invention. It is a partial cross section elevation figure which shows typically the structure of the lubricating oil supply system (oil supply system) which concerns on the 3rd Embodiment of this invention.

  Hereinafter, some embodiments of the present invention will be described in detail with reference to the accompanying drawings. In each of the embodiments shown in FIGS. 1 to 4, as a specific application example of the present invention, a lubricating oil supply system that supplies the gear device while circulating the lubricating oil will be described. The present invention is not limited to a lubricating oil supply system, and various oil supply systems that supply oil while circulating it to an oil using device that is wetted by oil (for example, lubricating oil, hydraulic oil, etc.) or immersed in oil. It can be widely applied.

(First embodiment)
First, a first embodiment of the present invention will be described with reference to FIG.
As shown in FIG. 1, according to the first embodiment, a lubricating oil supply system 2a (hereinafter referred to as “system 2a” for short) that supplies lubricating gear (oil) to a gear device 1 (oil using device) while circulating the lubricating oil. )) Is provided with a device housing chamber 3 having a hermetically sealed and pressure-resistant structure for housing the gear device 1. In the gear device 1, torque (rotation) of the input shaft 4 is input to the output shaft 8 via the input gear 6 and the output bevel gear pair 7. An output gear 9 is provided.

  In the gear device 1, the input gear 6 and the output gear 9 mesh with each other, and the torque of the input shaft 4 is decelerated or increased according to the number of teeth of the input gear 6 and the number of teeth of the output gear 9. Is output. The input shaft 4 and the output shaft 8 are rotatably supported by an input-side bearing 10 and an output-side bearing 11 provided on the side wall of the device housing chamber 3, respectively, and extend from the inside of the device housing chamber 3 to the outside. The sliding contact portion between the input shaft 4 and the input side bearing 10 and the sliding contact portion between the output shaft 8 and the output side bearing 11 are each strictly sealed (sealed) by a sealing mechanism (not shown). .

  In the apparatus housing chamber 3, a plurality of nozzles 12 for spraying, spraying, or flowing down lubricating oil to the input side bevel gear pair 5, the output side bevel gear pair 7, and the meshing portions of the input gear 6 and the output gear 9. Is provided with a lubricating oil supplier 13. Thereby, the meshing part of the input side bevel gear pair 5, the meshing part of the output side bevel gear pair 7, and the meshing part of the input gear 6 and the output gear 9 are always wetted by the lubricating oil supplied from the lubricating oil supplier 13, Lubricated. Then, in the lower part (the vicinity of the lower end) or the vicinity of the bottom of the device housing chamber 3, the lubricating oil that has flowed down or dropped from the gear device 1 stays. When the rotational speeds of the input gear 6 and the output gear 9 are relatively low, the meshing portion between the input gear 6 and the output gear 9 is immersed in the lubricating oil staying in the device housing chamber 3. You may make it lubricate.

  The system 2 a includes a lubricating oil storage tank 14 having a sealed structure for storing lubricating oil to be supplied to the gear device 1, and a lubricating oil recirculation for returning the lubricating oil staying in the apparatus housing chamber 3 to the lubricating oil storage tank 14. A passage 15 is provided. One end of the lubricating oil recirculation passage 15 is connected to a lubricating oil discharge port 16 provided in the lower part of the apparatus housing chamber 3 or in the vicinity of the bottom, and the lubricating oil recirculation path 15 is connected to the space in the apparatus housing chamber 3. Communicate. The other end of the lubricating oil recirculation passage 15 is connected to a lubricating oil recirculation port 17 provided in the upper part or upper half of the lubricating oil storage tank 14, and the lubricating oil recirculation passage 15 is connected to a space in the lubricating oil storage tank 14. Communicate.

  Further, the system 2a is driven by an electric motor 18 (motor) in order to pump or transport the lubricating oil stored in the lubricating oil storage tank 14 to the lubricating oil supply device 13 arranged in the apparatus housing chamber 3. Stored in the lubricating oil storage tank 14 and the lubricating oil guide passage 21 for guiding or transporting the lubricating oil discharged from the lubricating oil discharge port 20 of the hydraulic pump 19 to the lubricating oil supply device 13. A lubricating oil introduction passage 22 for introducing the lubricating oil into the hydraulic pump 19 is provided. One end of the lubricating oil introduction passage 22 is connected to a lubricating oil supply port 23 provided in the lower part of the lubricating oil storage tank 14 or in the vicinity of the bottom, and the lubricating oil introduction passage 22 is connected to a space in the lubricating oil storage tank 14. Communicate. The other end of the lubricating oil introduction passage 22 is connected to a lubricating oil suction port 24 of the hydraulic pump 19, and the lubricating oil introduction passage 22 communicates with the oil chamber 25 of the hydraulic pump 19.

  The hydraulic pump 19 is not particularly limited. Lubricant is supplied with an appropriate discharge pressure (for example, 0.5 to 1.0 MPa) and an amount of discharge (for example, depending on the size of the gear device 1 to be lubricated). 1 to 10 L / min) as long as it can be discharged. For example, a radial type or axial type plunger pump (piston pump), vane pump, gear pump, screw pump, or the like can be used.

  Here, with respect to the vertical direction, the position of the lubricating oil discharge port 16 in the apparatus storage chamber 3, that is, the position of the connection portion (communication portion) between the apparatus storage chamber 3 and the lubricating oil recirculation passage 15 is from the upper end of the lubricating oil storage tank 14. It is set at a high position (for example, the height difference between the connecting portion and the upper end portion of the lubricating oil storage tank is 0.2 to 2.0 m). Further, with respect to the vertical direction, the position of the lubricating oil supply port 23 of the lubricating oil storage tank 14, that is, the position of the connecting part (communication part) between the lubricating oil storage tank 14 and the lubricating oil introduction passage 22 is the upper end of the hydraulic pump 19 or its oil. It is set at a position higher than the upper end of the chamber 25 (for example, the height difference between the connecting portion and the upper end of the hydraulic pump or the upper end of the oil chamber is 0.05 to 0.2 m).

  Further, the system 2a includes a vacuum pump 28 (vacuum) that sucks and exhausts air in the device housing chamber 3 and air in the lubricating oil storage tank 14 via the first exhaust passage 26 and the second exhaust passage 27, respectively. Source). One end portion of the first exhaust passage 26 is connected to a first exhaust port 29 provided in the ceiling portion of the apparatus housing chamber 3, and the other end portion is connected to an air suction port 30 of the vacuum pump 28. One end of the second exhaust passage 27 is connected to a second exhaust port 31 provided in the ceiling portion of the lubricating oil storage tank 14, and the other end is connected to the air suction port 30 of the vacuum pump 28. Yes. The first exhaust passage 26 and the second exhaust passage 27 are respectively provided with a first exhaust passage on-off valve 32 and a second exhaust passage on-off valve 33 for opening and closing them.

  As long as the vacuum pump 28 can maintain the inside of the apparatus storage chamber 3 and the inside of the lubricating oil storage tank 14 in a substantially vacuum state (for example, 1 to 100 Pa), any type may be used. For example, it is practical to use a piston vacuum pump, a mechanical booster pump, a roots vacuum pump, or the like.

  In the device storage chamber 3 and the lubricating oil storage tank 14, a first atmosphere for opening the internal space to the atmosphere as needed (for example, when the system 2 a is stopped or during maintenance). An opening port 34 and a second atmosphere opening port 35 are provided. The first atmosphere opening port 34 is connected to a first atmosphere opening passage 36 whose tip is opened to the atmosphere, and a first atmosphere opening passage opening / closing valve 37 is interposed in the first atmosphere opening passage 36. On the other hand, the second atmosphere opening port 35 is connected to a second atmosphere opening passage 38 whose tip is opened to the atmosphere, and a second atmosphere opening passage opening / closing valve 39 is interposed in the second atmosphere opening passage 38. .

  The device storage chamber 3 and the lubricating oil storage tank 14 are provided with a first pressure gauge 40 and a second pressure gauge 41 for detecting the internal pressure (degree of vacuum), respectively. In addition, an oil inlet 42 for supplying or removing the lubricating oil in the lubricating oil storage tank 14 is provided in the ceiling portion of the lubricating oil storage tank 14. The oil inlet 42 is strictly sealed with a seal cap 43. The seal cap 43 can be easily attached to and detached from the oil supply port 42.

  Thus, when the gear device 1 and the system 2a are in operation, the first exhaust passage opening / closing valve 32 and the second exhaust passage opening / closing valve 33 are opened while the vacuum pump 28 is operated. At this time, the air in the device storage chamber 3 and the air in the lubricating oil storage tank 14 are both sucked and exhausted by the vacuum pump 28, and the inside of the device storage chamber 3 and the lubricating oil storage tank 14 are in a substantially vacuum state (for example, 1 ~ 100 Pa). The air sucked and exhausted by the vacuum pump 28 is discharged from the exhaust port 44 into the atmosphere.

  As described above, the device storage chamber 3 and the lubricating oil storage tank 14 have a sealed structure. For example, the sliding contact portion between the input side bearing 10 and the input shaft 4, the sliding contact portion between the output side bearing 11 and the output shaft 8, or an oil inlet. It is preferable that the vacuum pump 28 is always operated because there is a risk that some air may leak from the contact portion of the seal cap 43 and the like. However, when the pressure in the device storage chamber 3 and the lubricating oil storage tank 14 detected by the first pressure gauge 40 and the second pressure gauge 41 is equal to or lower than a preset reference value (for example, 10 Pa), the first The operation of the vacuum pump 28 may be stopped by closing the exhaust passage opening / closing valve 32 and the second exhaust passage opening / closing valve 33. In this case, it is preferable that the first exhaust passage opening / closing valve 32, the second exhaust passage opening / closing valve 33, and the vacuum pump 28 are automatically controlled based on the detected values of the first pressure gauge 40 and the second pressure gauge 41.

  Thus, the lubricating oil introduced into the oil chamber 25 of the hydraulic pump 19 from the lubricating oil storage tank 14 via the lubricating oil introduction passage 22 in a state where the inside of the apparatus housing chamber 3 and the lubricating oil storage tank 14 are almost in vacuum. The hydraulic pump 19 is pumped or transported to the lubricating oil supplier 13 via the lubricating oil guide passage 21 and supplied to the gear unit 1. The lubricating oil that has lubricated the gear unit 1 flows down or drops by gravity, and stays in the lower part of the apparatus housing chamber 3 or near the bottom. The lubricating oil staying in this way returns to the lubricating oil storage tank 14 by gravity through the lubricating oil recirculation passage 15. That is, the lubricating oil circulates or circulates in an annular lubricating oil path (hereinafter referred to as “annular lubricating oil path”) that passes through the lubricating oil storage tank 14 and the apparatus storage chamber 3.

  At this time, since both the inside of the device storage chamber 3 and the inside of the lubricating oil storage tank 14 are in a substantially vacuum state, the upper surface of the lubricating oil in the device receiving chamber 3 and the upper surface of the lubricating oil in the lubricating oil storage tank 14 are large. Barometric pressure does not work. On the other hand, the vertical position of the lubricating oil discharge port 16 in the apparatus storage chamber 3, that is, the vertical position of the connecting portion (communication portion) between the apparatus storage chamber 3 and the lubricating oil recirculation passage 15 is the upper end of the lubricating oil storage tank 14. It is set to a higher position. Therefore, regardless of the level of the lubricating oil stored in the lubricating oil storage tank 14, the lubricating oil staying in the device housing chamber 3 flows down in the lubricating oil recirculation passage 15 by the action of gravity. Into the lubricating oil storage tank 14.

  Further, while the inside of the lubricating oil storage tank 14 is almost in a vacuum state, the oil chamber 25 of the hydraulic pump 19 is closed to the atmosphere, so that the lubricating oil path from the lubricating oil storage tank 14 to the oil chamber 25 is not in the lubricating oil path. Atmospheric pressure does not work. At least during operation of the hydraulic pump 19, regardless of the type of the hydraulic pump 19, the pressure of the lubricating oil in the oil passage on the lubricating oil discharge port 20 side from the oil chamber 25 is applied to the lubricating oil in the lubricating oil introduction passage 22. Does not work. On the other hand, the vertical position of the lubricating oil supply port 23 of the lubricating oil storage tank 14, that is, the vertical position of the connecting portion (communication portion) between the lubricating oil storage tank 14 and the lubricating oil introduction passage 22 is determined by the hydraulic pump 19 or its oil chamber. It is set at a position higher than the upper end portion of 25. Therefore, the lubricating oil stored in the lubricating oil storage tank 14 flows down in the lubricating oil introduction passage 22 by the action of gravity and flows into the oil chamber 25 of the hydraulic pump 19.

  In short, since the device storage chamber 3, the lubricating oil storage tank 14, and the hydraulic pump 19 are arranged so as to have the height difference as described above, in the annular lubricating oil path in the system 2a in a substantially vacuum state, the device The lubricating oil staying in the storage chamber 3 is supplied to the oil chamber 25 of the hydraulic pump 19 via the lubricating oil storage tank 14 substantially only by the action of gravity.

  The lubricating oil in the oil chamber 25 of the hydraulic pump 19 is pressurized by the pressurizing member of the hydraulic pump 19 and discharged from the lubricating oil discharge port 20, and is sent to the lubricating oil supply device 13 through the lubricating oil guide passage 21. Transported. The pressurizing member of the hydraulic pump 19 is, for example, a plunger when the hydraulic pump 19 is a plunger pump, a gear when the gear pump is used, and a rotating blade (impeller) when the rotary pump is used. A check valve 45 is provided in the lubricant guide passage 21 in the vicinity of the lubricant discharge port 20 to prevent the backflow of the lubricant.

  When the system 2a is in operation, the vacuum pump 28 sucks and exhausts the air in the apparatus housing chamber 3 and the lubricating oil storage tank 14, and the annular lubricating oil path in the system 2 is maintained in a substantially vacuum state. In this way, when the system 2 is in operation, substantially no air is present in the annular lubricating oil path of the system 2, so that no bubbles are generated in the lubricating oil. Therefore, it is not necessary to provide a bubble removing means for removing bubbles in the lubricating oil (oil) unlike the conventional oil supply system. For this reason, there is no problem as described above due to mixing of bubbles in the lubricating oil. Therefore, when supplying the gear device 1 while circulating the lubricating oil, it is possible to reliably prevent bubbles from being mixed into the lubricating oil, and to reliably prevent deterioration due to oxidation of the lubricating oil. .

(Modification of the first embodiment)
Hereinafter, a modification of the first embodiment of the present invention will be described with reference to FIG. However, the basic configuration of a lubricating oil supply system 2b according to this modification (hereinafter referred to as “system 2b” for short) is common to the system 2a according to the first embodiment shown in FIG. Therefore, in order to avoid duplication of explanation, differences from the first embodiment are mainly described below. 2 that are common to the components of the system 2a shown in FIG. 1 are assigned the same reference numerals as those in FIG.

  In the system 2a shown in FIG. 1, when the level of the lubricating oil in the lubricating oil storage tank 14 is relatively low, for example, when the level of the lubricating oil drops to a position just above the lubricating oil supply port 23, the lubricating oil is introduced. The flow rate of the lubricating oil flowing from the lubricating oil storage tank 14 to the lubricating oil suction port 24 of the hydraulic pump 19 via the passage 22 decreases, and there is a possibility that the discharging of the lubricating oil by the hydraulic pump 19 may not be performed smoothly. That is, since the atmospheric pressure is not applied to the upper surface of the lubricating oil in the lubricating oil storage tank 14 as described above, the hydraulic pump 19 cannot suck the lubricating oil using the atmospheric pressure, and the lubricating oil is substantially not This is because it is introduced into the hydraulic pump 19 only by the liquid level difference or gravity.

  Therefore, as shown in FIG. 2, in the system 2 b according to this modification, the hydraulic pump 19 is arranged at a position somewhat lower than the lubricating oil storage tank 14, and the introduction of the lubricating oil from the lubricating oil storage tank 14 to the hydraulic pump 19 is promoted. Like to do. For example, the installation surface (base) of the hydraulic pump 19 is made lower by about 0.5 to 1 m than the installation surface (base) of the lubricating oil storage tank 14, and the level of the lubricating oil between the lubricating oil storage tank 14 and the hydraulic pump 19 is reduced. The difference is increased.

  Also in the system 2b according to the modification of the first embodiment, basically the same effect as the system 2a according to the first embodiment can be obtained. For example, the gear device 1 can be used while circulating the lubricating oil. When supplied, it is possible to reliably prevent bubbles from being mixed into the lubricating oil and to reliably prevent deterioration of the lubricating oil due to oxidation.

(Second Embodiment)
The second embodiment of the present invention will be described below with reference to FIG. However, the basic configuration of the lubricating oil supply system 2c according to the second embodiment (hereinafter referred to as “system 2c” for short) is common to the system 2a according to the first embodiment shown in FIG. Therefore, in order to avoid duplication of explanation, differences from the first embodiment are mainly described below. 3 that are common to the components of the system 2a shown in FIG. 1 are assigned the same reference numerals as those in FIG.

  As shown in FIG. 3, in the system 2c according to the second embodiment, the lubricating oil storage tank 14 is bypassed and bypassed, and the lubricating oil storage tank bypass connected to the lubricating oil recirculation passage 15 and the lubricating oil introduction passage 22 is bypassed. A passage 51 is provided. A first on-off valve 52 is interposed in the lubricant storage tank bypass passage 51. In addition, a second opening / closing valve 53 is provided in the lubricating oil recirculation passage 15 at a position closer to the lubricating oil storage tank than the connecting portion P1 with the lubricating oil storage tank bypass passage 51, while a connection portion P2 with the lubricating oil storage tank bypass passage 51 is provided. A third opening / closing valve 54 is interposed in the lubricating oil introduction passage 22 at a position closer to the lubricating oil storage tank. Here, the lubricant storage tank bypass passage 51 is preferably directed from the connection portion P1 side to the connection portion P2 side so that a portion higher than the connection portion P1 does not occur so that the lubricating oil flows smoothly in the inside thereof. Therefore, it is arranged so that there is no portion where the height increases. The first to third on-off valves 52 to 54 may be any one that can automatically open or close the lubricating oil storage tank bypass passage 51, the lubricating oil recirculation passage 15 and the lubricating oil introduction passage 22 automatically or manually, respectively. Such a valve may be used.

  Also in the system 2c according to the second embodiment, basically the same effect as that of the system 2a according to the first embodiment can be obtained. For example, when the lubricating oil is circulated and used and supplied to the gear device 1 In addition, it is possible to reliably prevent bubbles from being mixed into the lubricating oil and to reliably prevent deterioration of the lubricating oil due to oxidation.

(Third embodiment)
Hereinafter, a third embodiment of the present invention will be described with reference to FIG. However, the basic configuration of the lubricating oil supply system 2d according to the third embodiment (hereinafter referred to as “system 2d” for short) is the same as that of the system 2a according to the first embodiment shown in FIG. Therefore, in order to avoid duplication of explanation, differences from the first embodiment are mainly described below. 4 that are common to the components of the system 2a shown in FIG. 1 are assigned the same reference numerals as those in FIG.

  As shown in FIG. 4, in the system 2d according to the third embodiment, the lubricating oil storage tank 14 and the lubricating oil recirculation passage 15 are not provided. One end of the lubricating oil introduction passage 22 is connected to the lubricating oil discharge port 16 of the apparatus housing chamber 3, and the other end is connected to the lubricating oil suction port 24 of the hydraulic pump 19. That is, the lubricating oil staying at the bottom or bottom of the device housing chamber 3 is directly introduced into the hydraulic pump 19 via the lubricating oil introduction passage 22. The vacuum pump 28 exhausts the air in the device housing chamber 3 through the first exhaust passage 26.

  The system 2d according to the third embodiment can basically achieve the same effects as the system 2a according to the first embodiment. For example, when the lubricating oil is circulated and used and supplied to the gear unit 1 In addition, it is possible to reliably prevent bubbles from being mixed into the lubricating oil and to reliably prevent deterioration of the lubricating oil due to oxidation. Further, since the lubricating oil storage tank and the lubricating oil recirculation passage are not provided, the configuration of the system 2d is simplified, and the manufacturing cost is reduced.

  DESCRIPTION OF SYMBOLS 1 Gear apparatus, 2a Lubricating oil supply system (1st Embodiment), 2b Lubricating oil supply system (modification of 1st Embodiment), 2c Lubricating oil supply system (2nd Embodiment), 2d Lubricating oil supply System (third embodiment), 3 device accommodating chamber, 4 input shaft, 5 input side bevel gear pair, 6 input gear, 7 output side bevel gear pair, 8 output shaft, 9 output gear, 10 input side bearing, 11 output side Bearing, 12 nozzle, 13 Lubricating oil feeder, 14 Lubricating oil storage tank, 15 Lubricating oil recirculation passage, 16 Lubricating oil discharge port, 17 Lubricating oil recirculation port, 18 Electric motor, 19 Hydraulic pump, 20 Lubricating oil discharge port, 21 Lubricating oil Guide passage, 22 Lubricating oil introduction passage, 23 Lubricating oil supply port, 24 Lubricating oil suction port, 25 Oil chamber, 26 First exhaust passage, 27 Second exhaust passage, 28 Vacuum 29, first exhaust port, 30 air suction port, 31 second exhaust port, 32 first exhaust passage opening / closing valve, 33 second exhaust passage opening / closing valve, 34 first atmosphere release port, 35 second atmosphere release port, 36 1st atmosphere release passage, 37 1st atmosphere release passage on-off valve, 38 2nd atmosphere release passage, 39 2nd atmosphere release passage on-off valve, 40 1st pressure gauge, 41 2nd pressure gauge, 42 Oil filling port, 43 Seal cap , 44 Exhaust port, 45 Check valve, 51 Lubricating oil tank bypass passage, 52 First on-off valve, 53 Second on-off valve, 54 Third on-off valve.

Claims (5)

An oil supply system for supplying oil to a device using oil,
A device housing chamber having a sealed structure for housing the oil using device;
An oil storage tank having a sealed structure for storing oil to be supplied to the oil using device;
A hydraulic pump for supplying the oil stored in the oil storage tank to the device storage chamber;
An oil guide passage connected to the oil discharge port of the hydraulic pump and the device storage chamber, for guiding oil discharged from the hydraulic pump to the device storage chamber;
An oil recirculation passage connected to the device storage chamber and the oil storage tank, for recirculating oil staying in a lower portion of the device storage chamber to the oil storage tank;
An oil introduction passage connected to the oil storage tank and an oil suction port of the hydraulic pump, for introducing oil stored in the oil storage tank into the hydraulic pump;
A vacuum source for exhausting the air in the device storage chamber and the air in the oil storage tank through an exhaust passage;
The connecting portion between the device storage chamber and the oil return passage is disposed at a position higher than the upper end of the oil storage tank,
The oil supply system, wherein a connection portion between the oil storage tank and the oil introduction passage is disposed at a position higher than an upper end portion of the hydraulic pump or an oil chamber of the hydraulic pump. An oil supply system for supplying oil to a device using oil,
A device housing chamber having a sealed structure for housing the oil using device;
An oil storage tank having a sealed structure for storing oil to be supplied to the oil using device;
A hydraulic pump for supplying the oil stored in the oil storage tank to the device storage chamber;
An oil guide passage connected to the oil discharge port of the hydraulic pump and the device storage chamber, for guiding oil discharged from the hydraulic pump to the device storage chamber;
An oil recirculation passage connected to the device storage chamber and the oil storage tank, for recirculating oil staying in a lower portion of the device storage chamber to the oil storage tank;
An oil introduction passage connected to the oil storage tank and an oil suction port of the hydraulic pump, for introducing oil stored in the oil storage tank into the hydraulic pump;
Bypassing the oil storage tank, an oil storage tank bypass path connected to the oil return path and the oil introduction path;
A vacuum source for exhausting the air in the device storage chamber and the air in the oil storage tank through an exhaust passage;
A first on-off valve is interposed in the oil storage tank bypass passage;
A second on-off valve is interposed in the oil recirculation passage at a position closer to the oil storage tank than the connection with the oil storage tank bypass passage,
A third on-off valve is interposed in the oil introduction passage at a position closer to the oil storage tank than the connection with the oil storage tank bypass passage,
The connecting portion between the device storage chamber and the oil return passage is disposed at a position higher than the upper end of the oil storage tank,
The oil supply system, wherein a connection portion between the oil storage tank and the oil introduction passage is disposed at a position higher than an upper end portion of the hydraulic pump or an oil chamber of the hydraulic pump. An oil supply system for supplying oil to a device using oil,
A device housing chamber having a sealed structure for housing the oil using device;
A hydraulic pump;
An oil introduction passage connected to a lower portion of the device storage chamber and an oil suction port of the hydraulic pump, for introducing oil remaining in the lower portion of the device storage chamber into the hydraulic pump;
An oil guide passage connected to the oil discharge port of the hydraulic pump and the device storage chamber, for guiding oil discharged from the hydraulic pump to the device storage chamber;
A vacuum source for exhausting air in the apparatus housing chamber through an exhaust passage,
The oil supply system, wherein a connection portion between the device storage chamber and the oil introduction passage is disposed at a position higher than an upper end portion of the hydraulic pump or an oil chamber of the hydraulic pump. The oil using device is a gear device in which a plurality of gears mesh with each other,
The oil is a lubricating oil;
4. A lubricating oil feeder connected to the oil guide passage and spraying or flowing down the lubricating oil to the gear device is disposed in the device housing chamber. Oil supply system described in one.   5. The oil supply system according to claim 4, wherein the gear device is a speed reducer or a speed increasing device that decelerates or increases the torque of the input shaft and outputs the resultant to the output shaft.

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