JP2011002061A - Gear lubricating structure and on-vehicle transmission having the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gear lubricating structure reducing rotational resistance of gears and an on-vehicle transmission having the structure.SOLUTION: This gear lubricating structure includes a second fixed gear 32 as a first gear, a first shift gear 34 as a second gear meshing with the second fixed gear 32, and a storage part 40 for storing lubricating oil used for lubricating these gears. A partition wall 50 having a communication hole 56 is provided between the second fixed gear 32 and the storage part 40. The lubricating oil is stored between the partition wall 50 and a wall surface of the storage part 40.

Description

  The present invention relates to a gear lubrication structure including a first gear and a second gear meshed with each other, and a storage portion that stores lubricating oil used to lubricate these gears, and an in-vehicle transmission including the lubrication structure.

As a gear lubrication structure, for example, the one described in Patent Document 1 is known.
According to the lubricating structure of this document, the lubricating oil stored in the bottom of the case is pumped up as the first gear rotates, so that the lubricating oil is supplied to the meshing portion between the first gear and the second gear. The meshing part is lubricated.

JP 2000-274518 A

  In the lubricating structure of the above-mentioned Patent Document 1, a structure in which the gear is rotated in a state in which many parts of the first gear are immersed in the lubricating oil is employed, so that a large rotational resistance is applied to the first gear. The accompanying energy loss becomes a problem.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a lubricating structure for a gear capable of reducing the rotational resistance of the gear and an in-vehicle transmission provided with the same.

In the following, means for achieving the above object and its effects are described.
(1) The invention according to claim 1 is a gear lubrication structure comprising a first gear and a second gear meshed with each other, and a storage portion for storing lubricating oil used for lubricating these gears. A gist is that a partition wall having a communication hole is provided between one gear and the storage portion, and lubricating oil is stored between the partition wall and the wall surface of the storage portion.

  According to the present invention, the lubricating oil that has flowed out from the wall surface side of the storage portion to the first gear side through the communication hole is lifted up by the first gear, whereby the first gear is used when the first gear is pumping up the lubricating oil. Since the contact area between the oil and the lubricating oil is smaller than that of the conventional lubricating structure, the rotational resistance of the gear can be reduced.

  (2) The invention according to claim 2 is the gear lubrication structure according to claim 1, wherein the first gear and the second gear are accommodated in a case, and the storage portion is provided in the case. The gist is that it is provided at the bottom.

  (3) The invention according to claim 3 is the gear lubrication structure according to claim 2, wherein the case includes an outlet for lubricating oil from the case and an inlet for lubricating oil into the case. The gist is that a communication passage that connects the outlet and the inlet to each other is provided outside the case.

  According to the present invention, since the communication path connecting the outlet and the inlet is provided, the lubricating oil dissipates heat when it flows through the communication path, so that compared with a lubrication structure in which no communication path is provided. The lubricating oil can be efficiently cooled.

(4) The invention according to claim 4 is characterized in that, in the gear lubricating structure according to claim 3, an oil pump is provided in the middle of the communication path.
According to this invention, since the lubricating oil discharged from the outlet to the communication path is supplied into the case by the pump, it is possible to suitably suppress the shortage of the lubricating oil amount in the case.

  (5) The invention according to claim 5 is the gear lubrication structure according to claim 3 or 4, wherein the outlet is provided at a position facing the lubricating oil scattering side of the meshing portion of the first gear and the second gear. The gist is that it is provided.

  According to the present invention, since the lubricating oil that has become hot due to the lubrication at the meshing portion of the first gear and the second gear is discharged from the outlet to the communication path, the lubricating oil stored in the reservoir is excessively hot. It becomes possible to suppress becoming.

  (6) According to a sixth aspect of the present invention, in the gear lubricating structure according to the fifth aspect, the inlet is provided on a side opposite to the outlet with respect to the first gear and the second gear. It is a summary.

  According to the present invention, the inlet is provided on the side opposite to the lubricant outlet, that is, on the side opposite to the lubricant scattering side of the meshing portion of the first gear and the second gear. It is possible to suppress mixing of the lubricating oil and the high-temperature lubricating oil scattered from the meshing portion and flowing into the storage portion.

  (7) The invention according to claim 7 is the gear lubrication structure according to any one of claims 3 to 6, wherein the inlet guide portion that guides the lubricating oil from the inlet toward the storage portion. The gist is that it is provided.

  According to this invention, since the lubricating oil from the inlet is guided to the storage part through the inlet guide part, the lubricating oil from the inlet flows into a predetermined part corresponding to the opening part of the guide part in the storage part. It is possible to suitably suppress the mixing of the lubricating oil supplied from the inlet and the high-temperature lubricating oil flowing into the storage portion scattered from the meshing portion.

  (8) According to an eighth aspect of the present invention, in the gear lubrication structure according to any one of the first to seventh aspects, the first gear and the second gear are opposed to the meshing portion. The gist is that a guide wall is provided for guiding the lubricating oil pumped up by the first gear to the meshing portion.

  According to the present invention, since the lubricating oil pumped up by the first gear is guided to the meshing portion between the first gear and the second gear by the guide wall, the meshing portion can be more suitably lubricated. become.

(9) The invention according to claim 9 is characterized in that, in the lubricating structure for a gear according to claim 8, the partition wall and the guide wall are connected to each other.
According to the present invention, since the partition wall and the guide wall are connected, the lubricating oil is prevented from leaking from between the partition wall and the guide wall, so the partition wall and the guide wall are connected. As compared with the case where there is no gear, the lubricating oil pumped up by the first gear can be accurately guided to the meshing portion of each gear.

  (10) The invention according to claim 10 is the gear lubrication structure according to any one of claims 1 to 9, wherein the partition wall is provided above the storage portion in a vertical direction. And the communication hole is provided at the bottom of the partition wall.

  According to the present invention, since the lubricating oil continues to be supplied to the first gear through the communication hole until the liquid level of the amount of the lubricating oil reaches the bottom of the partition wall, the communication hole is vertically higher than the bottom of the partition wall. It is possible to suppress the occurrence of a frequency in which the supply of the lubricating oil to the first gear is insufficient as compared with the structure having the provided structure.

  (11) According to an eleventh aspect of the present invention, in the gear lubricating structure according to any one of the first to tenth aspects, an arcuate shape corresponding to the shape of the first gear is provided as the partition wall. The gist is that

  According to the present invention, since the partition wall has an arc shape corresponding to the shape of the first gear, the lubricating oil scattered with the rotation of the first gear is likely to adhere to the gear again after rebounding from the partition wall. Therefore, it is possible to suppress a decrease in the amount of oil used for lubricating the meshing portion.

  (12) According to a twelfth aspect of the present invention, in the gear lubrication structure according to any one of the first to eleventh aspects, the first gear and the second gear are gears of an in-vehicle transmission of a transmission. There is a summary.

  (13) The invention according to claim 13 is an in-vehicle transmission configured to include a lubricating structure of a gear that lubricates a plurality of gears, and the lubricating structure of the gear is any one of claims 1 to 12. The gear lubrication structure described in the above is used.

Sectional drawing which shows typically the structure of the lubricating device about embodiment which actualized the lubricating device of the transmission of this invention. About the lubricating device of the transmission of the embodiment, (a) is a cross-sectional view showing a cross-sectional structure taken along A1-A1 in FIG. In the transmission lubrication device of the embodiment, (a) is a schematic diagram schematically showing the state of lubricating oil when the second fixed gear and the first transmission gear are stopped, and (b) is a second fixed gear. Schematic diagram schematically showing the state of the lubricating oil when the gear and the first transmission gear are rotating, (c) schematically shows the state of the lubricating oil when the level of the lubricating oil exceeds the limit liquid level FIG.

With reference to FIGS. 1 to 3, a specific embodiment in which the gear lubrication structure of the present invention is embodied as a gear lubrication structure of an in-vehicle transmission will be described.
As shown in FIG. 1, the transmission 1 includes an input shaft 21 connected to a crankshaft of an internal combustion engine, a counter shaft 22 driven by the input shaft 21, and an output shaft 23 driven by the counter shaft 22. A case 10 that accommodates the shafts 21 to 23 and a lubricating device 4 that lubricates the gears of the shafts 21 to 23 are provided.

  A drive gear 36 is fixed to the input shaft 21. A first fixed gear 31, a second fixed gear 32, and a third fixed gear 33 are fixed to the counter shaft 22. The output shaft 23 is provided with a first transmission gear 34 and a second transmission gear 35 that are allowed to rotate with respect to the shaft 23. The first transmission gear 34 and the second transmission gear 35 are fixed to the output shaft 23 by engaging with a sleeve separately provided on the output shaft 23.

  The drive gear 36 of the input shaft 21 meshes with the first fixed gear 31 of the counter shaft 22. The second fixed gear 32 of the counter shaft 22 meshes with the first transmission gear 34 of the output shaft 23. Further, the third fixed gear 33 of the counter shaft 22 meshes with the second transmission gear 35 of the output shaft 23. When either the first transmission gear 34 or the second transmission gear 35 is engaged with the corresponding sleeve, the transmission gear engaged with the sleeve is fixed to the output shaft 23. As a result, the rotation of the countershaft 22 is transmitted to the output shaft 23 via the same transmission gear.

  These input shaft 21, counter shaft 22 and output shaft 23 are arranged as follows. That is, the input shaft 21 and the output shaft 23 are arranged coaxially. The counter shaft 22 is provided below the input shaft 21 and the output shaft 23 in the vertical direction Z. The first fixed gear 31 is provided below the drive gear 36 in the vertical direction Z. The second fixed gear 32 is provided below the first transmission gear 34 of the output shaft 23 in the vertical direction Z. The third fixed gear 33 is provided below the second transmission gear 35 in the vertical direction Z. Of the gears engaged with each other, the first fixed gear 31, the second fixed gear 32, and the third fixed gear 33 that are below the vertical direction Z are described in the claims. Each of the drive gear 36, the first transmission gear 34, and the second transmission gear 35 corresponds to a “second gear” recited in the claims.

  The lubricating device 4 is provided as a part of the case 10 to store the lubricating oil, the communication passage 60 that connects the lubricating oil inlet 12 and the outlet 13 provided in the case 10, and the communication passage. 60, a tank 71 that stores lubricating oil, a heat exchanger 72 that is also provided in the communication path 60 and cools the lubricating oil, and an oil pump 73 that is also provided in the communication path 60 and circulates the lubricating oil. It is comprised by.

  The structure of the lubricating device 4 will be described with reference to FIG. 2A schematically shows a cross-sectional structure of the lubricating device 4 along the line AA in FIG. 1, and FIG. 2B schematically shows an enlarged structure of the storage section 40. Further, the level of the lubricating oil in FIG. 2 indicates a state when the transmission 1 is driven. Hereinafter, the direction of the arrow D in the figure is referred to as the “width direction D” of the lubricating device 4. In the width direction D, the inlet 12 side of the case 10 with respect to the center of the first transmission gear 34 or the second fixed gear 32 is referred to as “upstream side D1”, and the outlet 13 side of the case 10 with respect to the center is referred to as “downstream side D2”. "

  The reservoir 40 is provided in the lower part of the case 10. The storage unit 40 is provided with an internal space 41 for storing lubricating oil. A lower portion of the second fixed gear 32 is disposed in the internal space 41. The second fixed gear 32 and the first transmission gear 34 are meshed with each other above the internal space 41 in the vertical direction. That is, the meshing portion 37 between the second fixed gear 32 and the first transmission gear 34 is located in a space above the internal space 41 in the vertical direction in the space in the case 10. In addition, the meshing part 37 shows the whole part in which the teeth of the other gear have entered the tooth gap of one gear.

  A partition wall 50 is provided between the storage unit 40 and the second fixed gear 32. As shown in FIG. 2B, the internal space 41 of the storage unit 40 is partitioned into a first space 42 on the bottom wall 11 side of the case 10 and a second space 43 on the second fixed gear 32 side by the partition wall 50. Has been. The distance between the outer peripheral surface of the gear 32 and the peripheral wall 51 in the radial direction of the second fixed gear 32 is set to be approximately the same throughout the entire circumferential direction.

  As shown in FIG. 1, the partition wall 50 is also provided between the storage unit 40 and the first fixed gear 31 and between the storage unit 40 and the third fixed gear 33. The partition walls 50 are connected to each other by a connection wall 57, thereby being configured as an integral element.

  The partition wall 50 includes an arc-shaped peripheral wall 51 corresponding to the shape of the second fixed gear 32 and a pair of side walls 52 facing the side surface side of the second fixed gear 32. A communication hole 56 that communicates the first space 42 and the second space 43 is provided at the bottom 55 of the peripheral wall 51. Further, the communication hole 56 is provided at a position corresponding to the central axis of the second fixed gear 32 in the width direction D. Lubricating oil stored between the partition wall 50 and the bottom wall 11 of the case 10 flows from the first space 42 into the second space 43 through the communication hole 56.

  The upper end 53 of the downstream side D2 of the partition wall 50 is arranged at a position higher than the limit liquid level OL of the storage unit 40 in the vertical direction Z. Here, the limit liquid level OL indicates the limit level of the liquid level of the lubricating oil stored in the first space 42, for example, as a value corresponding to the upper limit value of the range allowed as the rotational resistance of the fixed gears 31 to 33. Determined.

  The distance between the peripheral wall 51 and the second fixed gear 32 is set to be approximately the same in the entire circumferential direction, and is set to be smaller than the distance between the peripheral wall 51 and the bottom wall 11 of the case 10. Further, the size is set such that the lubricating oil splashed from the gear 32 with the rotation of the second fixed gear 32 rebounds from the peripheral wall 51 and adheres to the second fixed gear 32 again.

  The upper end 53 on the downstream side D2 of the partition wall 50 is defined as the “scattering angle T” as an angle in the scattering direction with respect to the width direction D of the lubricating oil scattered from the downstream D2 end (point P1 in the drawing) of the meshing portion 37. Is provided in a place where the flow of the lubricating oil that scatters at the angle with the largest scattering angle T among the angles assumed as the scattering angle T is not hindered. Specifically, when the locus from the meshing portion 37 of the lubricating oil having the largest scattering angle T is indicated by an imaginary line L, the upper end 53 of the partition wall 50 is set to be in contact with the imaginary line L. Yes.

  A guide wall 44 for guiding the lubricating oil to the meshing portion 37 is provided at the upper end 54 of the upstream side D1 of the partition wall 50. The guide wall 44 is provided at a position corresponding to the meshing portion 37 in the vertical direction, and a lower end thereof is connected to the partition wall 50. The guide wall 44 includes a first guide portion 45 connected to the partition wall 50 and a second guide portion 46 that inclines from the first guide portion 45 toward the first transmission gear 34. The 2nd guide part 46 inclines in the aspect extended upwards from the downward direction of the perpendicular direction Z as it goes to the downstream D2 from the upstream D1 of the width direction. As the second fixed gear 32 rotates, the lubricating oil scattered upward from the lower side hits the guide wall 44 and is guided to the meshing portion 37 between the second fixed gear 32 and the first transmission gear 34.

  In the case 10, a lubricating oil inlet 12 is formed in the wall portion on the upstream side D1. One end of the communication path 60 is connected to a portion of the inlet 12 outside the case 10. A tubular inlet guide 47 that guides the lubricating oil toward the first space 42 side of the reservoir 40 is connected to a portion of the inlet 12 inside the case 10. The inlet 12 is provided at substantially the same location as the central axis of the first transmission gear 34 in the vertical direction Z. The supply port 48 of the inlet guide 47 is provided in substantially the same position as the central axis of the second fixed gear 32 in the vertical direction Z. That is, the length of the inlet guide 47 in the vertical direction is set to a size corresponding to the length from the central axis of the first transmission gear 34 to the central axis of the second fixed gear 32. The passage area of the entrance guide 47 is set to be approximately the same as the opening area of the entrance 12. The supply port 48 of the inlet guide 47 is opposed to the bottom wall 11 of the case 10. As a result, the lubricating oil supplied to the inlet 12 through the communication passage 60 flows from the supply port 48 toward the first space 42 through the inlet guide portion 47.

  In the case 10, a lubricating oil outlet 13 is formed in the wall portion on the downstream side D2. The other end of the communication path 60 is connected to a portion of the outlet 13 outside the case 10. The outlet 13 is formed in a size that can sufficiently receive the lubricating oil scattered from the meshing portion 37. Here, the opening area of the outlet 13 is set larger than the opening area of the inlet 12. The upper end 14 of the outlet 13 is provided at substantially the same location as the meshing portion 37 in the vertical direction Z. The length of the outlet 13 in the vertical direction Z is set to a size corresponding to the length from the central axis of the second fixed gear 32 to the meshing portion 37.

  The lower end 15 of the outlet 13 is provided below the upper end 53 of the partition wall 50 in the vertical direction Z. Specifically, it is provided on an imaginary line L that passes through the end D2 (point P1 in the drawing) of the meshing portion 37 and the upper end (point P2 in the drawing) of the partition wall 50. Here, the lower end 15 of the outlet 13, the supply port 48 of the inlet guide 47 and the central axis of the second fixed gear 32 are provided at substantially the same position in the vertical direction Z. That is, the upper end 53 of the partition wall 50 is provided in the vertical direction Z higher than the lower end 15 of the outlet 13, the supply port 48 of the inlet guide 47 and the central axis of the second fixed gear 32. Further, the lower end 15 of the outlet 13 and the limit liquid level OL of the reservoir 40 are set at the same place in the vertical direction Z.

  The communication path 60 includes a first path 61 that connects the outlet 13 and the tank 71, a second path 62 that connects the tank 71 and the heat exchanger 72, and a first path that connects the heat exchanger 72 and the oil pump 73. 3 passages 63, and a fourth passage 64 connecting the oil pump 73 and the inlet 12. The tank 71 stores lubricating oil that has flowed out of the internal space 41 of the case 10. The heat exchanger 72 cools the lubricating oil with cooling water circulating through the internal combustion engine. The oil pump 73 is driven by the crankshaft of the internal combustion engine.

With reference to FIG. 3, the distribution | circulation aspect of the lubricating oil in the transmission 1 is demonstrated.
As shown in FIG. 3A, when the transmission 1 is stopped, the liquid level H1 of the lubricating oil in the first space 42 and the liquid level H2 in the second space 43 are in the same place. Further, substantially the entire portion below the center of the second fixed gear 32 is immersed in the lubricating oil.

  When each gear starts to rotate with the start of driving of the internal combustion engine, the lubricating oil in the second space 43 is scooped up by the second fixed gear 32. Further, as the rotational speed of the second fixed gear 32 increases, the liquid level H2 of the lubricating oil in the second space 43 gradually decreases. As the oil pump 73 is driven, the lubricating oil is supplied from the communication passage to the portion of the first space 42 between the upstream side D1 of the peripheral wall 51 and the case 10 through the inlet 12 and the inlet guide portion 47.

  As shown in FIG. 3B, when the start of the internal combustion engine is completed and the rotation speed of the second fixed gear 32 is in the rotation speed region corresponding to the normal operation region of the engine, that is, the second fixed gear. When 32 is continuously rotating at a predetermined rotational speed or higher, the liquid level H2 of the second space 43 is lowered to the vicinity of the end of the second fixed gear 32 on the lower side in the vertical direction Z. During operation of the transmission 1, in many cases, the lubricating oil is pumped up by the second fixed gear 32 in a state where the liquid level H2 of the second space 43 is in the vicinity of the same end. That is, as compared with the case where substantially the whole lower part of the second fixed gear 32 is immersed in the lubricating oil, the lubricating oil is pumped up with the stirring resistance of the second fixed gear 32 being sufficiently small. .

  Although the lubricating oil at the bottom of the second space 43 is consumed by scooping up the lubricating oil by the second fixed gear 32, the lubricating oil in the first space 42 flows into the second space 43 through the communication hole 56. A certain amount of lubricating oil stays in the bottom. In addition, since the low-temperature lubricating oil supplied from the inlet guide portion 47 flows into the communication hole 56 through the first space 42 among the lubricating oil staying in the first space 42, the lubrication that is lifted up by the second fixed gear 32. The temperature of oil is basically low.

  The lubricating oil supplied to the meshing part 37 is scattered from the meshing part 37 toward the downstream side D2. At this time, much of the lubricating oil scattered from the meshing portion 37 flows directly into the outlet 13. A part of the lubricating oil scattered from the meshing portion 37 upward in the vertical direction Z with respect to the width direction D adheres to the wall surface of the case 10 and then flows into the outlet 13 along the wall surface. On the other hand, part of the lubricating oil scattered from the meshing portion 37 toward the lower side in the vertical direction Z with respect to the width direction D may flow into a portion of the first space 42 on the downstream side of the peripheral wall 51. Also in this case, since the lubricating oil is supplied from the inlet guide portion 47 to the portion of the first space 42 between the upstream side D1 of the peripheral wall 51 and the case 10, the low-temperature lubricating oil is engaged with the supplied low-temperature lubricating oil. It is difficult to mix with the high-temperature lubricating oil scattered from the portion 37.

  The lubricating oil in the communication path 60 is cooled by the heat exchanger 72 after passing through the tank 71. Then, the oil is discharged toward the case 10 by the oil pump 73, and is supplied again to the storage unit 40 through the inlet 12 and the inlet guide 47.

  As shown in FIG. 3C, the lubricating oil level H <b> 1 in the first space 42 rises and exceeds the lower end 15 of the outlet 13 due to an increase in the amount of lubrication supplied from the inlet 12. At this time, the lubricating oil on the downstream side of the peripheral wall 51 in the first space 42 flows into the communication path 60 via the outlet 13. As a result, when the amount of lubricating oil in the first space 42 increases, the lubricating oil in the portion of the first space 42 on the downstream side of the peripheral wall 51, that is, the lubricating oil containing a large amount of high-temperature lubricating oil scattered from the meshing portion 37. First, it flows into the outlet 13.

According to the present embodiment, the following effects can be achieved.
(1) In this embodiment, a partition wall 50 having a communication hole 56 is provided between the second fixed gear 32 and the storage portion 40, and lubricating oil is provided between the partition wall 50 and the wall surface of the storage portion 40. Is stored. According to this configuration, the lubricating oil that has flowed from the bottom wall side of the reservoir 40 to the second fixed gear 32 side through the communication hole 56 is pumped up by the second fixed gear 32, so that the second fixed gear 32 is Since the contact area between the gear 32 and the lubricating oil when the lubricating oil is pumped is smaller than that of the conventional lubricating structure, the rotational resistance of the second fixed gear 32 can be reduced.

  (2) In the present embodiment, the lubricant outlet 13 from the case 10 and the lubricant inlet 12 into the case 10, and the communication path connecting the outlet 13 and the inlet 12 to each other outside the case 10. 60 is provided in the case 10.

  According to this configuration, since the communication path 60 that connects the outlet 13 and the inlet 12 is provided, the lubricating oil dissipates heat when it flows through the communication path 60, so that the communication path 60 is not provided. Compared with the structure, the lubricating oil can be efficiently cooled.

  (3) In this embodiment, the oil pump 73 is provided in the middle of the communication path 60. According to this configuration, since the lubricating oil discharged from the outlet 13 of the case 10 to the communication passage 60 is supplied into the case 10 by the oil pump 73, it is preferable that the amount of lubricating oil in the case 10 is insufficient. It becomes possible to suppress.

  (4) In the present embodiment, the outlet 13 is provided at a position facing the lubricating oil scattering side of the meshing portion 37 of the second fixed gear 32 and the first transmission gear 34. According to this configuration, since the lubricating oil that has become hot due to the lubrication at the meshing portion 37 of the second fixed gear 32 and the first transmission gear 34 is discharged from the outlet 13 to the communication path 60, it is stored in the storage portion 40. It becomes possible to suppress the lubricating oil being heated from becoming transiently hot.

  (5) In the present embodiment, the inlet 12 is provided on the side opposite to the outlet 13 with respect to the second fixed gear 32 and the first transmission gear 34. According to this configuration, the inlet 12 is provided on the side opposite to the outlet 13, that is, on the side opposite to the lubricating oil scattering side of the meshing portion 37 of the second fixed gear 32 and the first transmission gear 34. 12 and the high-temperature lubricating oil scattered from the meshing portion 37 and flowing into the storage portion 40 can be prevented from being mixed with each other.

  (6) In this embodiment, the inlet guide part 47 which guides the lubricating oil from the inlet 12 toward the storage part 40 is provided. According to this configuration, the lubricating oil from the inlet 12 is guided to the reservoir 40 through the inlet guide 47, so that the lubricating oil from the inlet 12 corresponds to the supply port 48 of the inlet guide 47 in the reservoir 40. Flow into a predetermined site. For this reason, it becomes possible to suitably suppress the mixture of the lubricating oil supplied from the inlet 12 and the high-temperature lubricating oil flowing into the storage section 40 scattered from the meshing section 37.

  (7) In the present embodiment, the lubricating oil pumped up by the second fixed gear 32 is guided to the meshing portion 37 at a position facing the meshing portion 37 of the second fixed gear 32 and the first transmission gear 34. A guide wall 44 is provided. According to this configuration, the lubricating oil pumped up by the second fixed gear 32 is guided to the meshing portion 37 between the second fixed gear 32 and the first transmission gear 34 by the guide wall 44, so that the meshing portion 37 is It becomes possible to lubricate more suitably.

  (8) In this embodiment, the partition wall 50 and the guide wall 44 are connected to each other. According to this configuration, since the partition wall 50 and the guide wall 44 are connected, leakage of the lubricating oil from between the partition wall 50 and the guide wall 44 is suppressed. Compared with the case where the motor 44 is not connected, the lubricating oil pumped up by the second fixed gear 32 can be accurately guided to the meshing portion 37 with the first transmission gear 34.

  (9) In the present embodiment, the partition wall 50 is provided above the storage unit 40 in the vertical direction Z, and the communication hole 56 is provided in the bottom 55 of the partition wall 50. According to this configuration, since the lubricating oil continues to be supplied to the second fixed gear 32 through the communication hole 56 until the liquid level of the amount of the lubricating oil reaches the bottom 55 of the partition wall 50, the communication hole 56 is formed on the partition wall 50. Compared to the structure provided above the bottom portion 55 in the vertical direction Z, it is possible to suppress the occurrence of a frequency in which the supply of the lubricating oil to the second fixed gear 32 is insufficient.

  (10) In the present embodiment, the partition wall 50 is provided with an arc shape corresponding to the shape of the second fixed gear 32. According to this configuration, since the partition wall 50 has an arc shape corresponding to the shape of the second fixed gear 32, the lubricating oil splashed with the rotation of the second fixed gear 32 rebounds from the partition wall 50. Since it becomes easy to adhere to the gear 32, a decrease in the amount of oil used for lubricating the meshing portion 37 can be suppressed.

  (11) In this embodiment, the upper end 53 of the partition wall 50 is lubricated with the largest scattering angle T when the angle of the scattering direction with respect to the width direction of the lubricating oil scattered from the meshing portion 37 is “scattering angle T”. It is provided where it does not obstruct the flow of oil. According to this configuration, since the frequency of the lubricant oil being scattered by the partition wall 50 and falling to the storage unit 40 is reduced, overheating of the temperature of the lubricant stored in the storage unit 40 can be suitably suppressed. it can.

  (12) In the present embodiment, the outlet 13 is formed in a size that can sufficiently receive the lubricating oil scattered from the meshing portion 37. According to this configuration, since the lubricating oil that has become hot due to the lubrication at the meshing portion 37 flows into the outlet 13 with high efficiency, overheating of the lubricating oil in the storage portion 40 can be suitably suppressed.

  (13) In the present embodiment, the outlet 13 is set larger than the opening area of the inlet 12. According to this configuration, as compared with the case where the opening areas of the outlet 13 and the inlet 12 are set to the same level, the lubricating oil that has become hot due to the lubrication at the meshing portion 37 is efficiently poured toward the outlet 13. be able to.

  (14) In the present embodiment, the lower end 15 of the outlet 13 is provided near the upper end 53 of the partition wall 50 in the vertical direction Z and below the upper end 53. According to this configuration, in the vertical direction Z, the lower end 15 of the outlet 13 is located at a position lower than the upper end 53 of the partition wall 50, and therefore when the liquid level of the lubricating oil stored in the second space 43 becomes high. The lubricating oil flows into the outlet 13. Thereby, it can suppress that lubricating oil flows into the 1st space 42 exceeding the partition wall 50. FIG.

  (15) In the present embodiment, the lower end 15 of the outlet is set at the same level as the limit liquid level OL. According to this configuration, the lubricating oil is discharged from the outlet 13 when the liquid level of the lubricating oil stored in the first space 42 exceeds the limit liquid level OL.

  (16) In the present embodiment, the supply port 48 of the inlet guide portion 47 is provided on the upstream side D <b> 1 of the first space 42, and the outlet 13 is provided on the downstream side D <b> 2 of the first space 42. According to this configuration, lubricating oil having a relatively low temperature is stored in the upstream side D1, and lubricating oil having a relatively high temperature is stored in the downstream side D2. That is, since the low-temperature lubricating oil sinks into the bottom of the first space 42 and flows into the second space 43 through the communication hole 56, overheating of the second fixed gear 32 can be suppressed.

  (17) In the conventional dry sump type lubrication structure, the following can be cited as a problem. That is, the pipe structure provided in the case for injecting the lubricating oil to the gear meshing portion becomes complicated (Problem 1). In addition, a pressurizing pump is required for lubricating oil injection, which increases the mass of the apparatus (Problem 2). Further, when the lubricating oil is at a low temperature, proper injection of the lubricating oil to the gear meshing portion becomes difficult due to the increase in clay (Problem 3).

  On the other hand, according to the lubricating structure of the present embodiment, the second fixed gear 32 scoops up the lubricating oil and lubricates the meshing portion 37, so that the above problems 1 to 3 can be solved. become able to.

(Other embodiments)
In addition, the embodiment of the present invention is not limited to the embodiment exemplified in the above-described embodiment, and can be implemented by changing it as shown below, for example. The following modifications are not applied only to the above-described embodiment, and different modifications can be combined with each other.

  In the above embodiment, the partition wall 50 is formed in an arc shape corresponding to the shape of the second fixed gear 32, but the shape of the partition wall 50 is not limited to this. For example, in order to enlarge the gap at the bottom of the second space 43, the partition wall 50 may be elliptical. According to such a configuration, the amount of lubricating oil stored at the bottom of the second space 43 can be increased.

  In the above embodiment, the communication hole 56 is formed in the bottom 55 of the peripheral wall 51 of the partition wall 50. However, the formation position of the communication hole 56 in the partition wall 50 is not limited to this. For example, the communication hole 56 can be formed in the side wall 52 of the partition wall 50.

  In the above embodiment, one communication hole 56 is provided in the partition wall 50, but a plurality of communication holes 56 may be provided in the partition wall 50. As a specific configuration in this case, for example, a configuration in which a plurality of communication holes 56 are provided at predetermined intervals in the circumferential direction of the peripheral wall 51, or a configuration in which at least one communication hole 56 is provided in each of the peripheral wall 51 and the side wall 52. Or the structure which provides the some communicating hole 56 in the side wall 52 at predetermined intervals is mentioned.

In the above embodiment, the communication hole 56 is provided in the peripheral wall 51 of the partition wall 50, but the communication hole 56 may be provided only in the side wall 52.
In the above embodiment, the upper end 53 of the partition wall 50 and the guide wall 44 are connected to each other. However, the upper end 53 of the partition wall 50 and the guide wall 44 may be provided apart from each other.

  In the above-described embodiment, the guide wall 44 is provided at a position facing the meshing portion 37 between the second fixed gear 32 and the first transmission gear 34, but the upper end 53 of the partition wall 50 is substituted for the guide wall 44. Can be extended to have the same function as the guide wall 44.

  In the above embodiment, the inlet guide 47 that guides the lubricating oil from the inlet 12 toward the second space 43 of the reservoir 40 is provided, but the inlet guide 47 may be omitted. In this case as well, effects other than (6) of the above embodiment can be obtained.

  In the above embodiment, the inlet 12 is provided on the side opposite to the outlet 13 with respect to the second fixed gear 32 and the first transmission gear 34, but the position where the inlet 12 is formed in the case 10 is limited to this. is not. For example, the inlet 12 can be provided in the side wall 52 (the left portion in the case 10 in FIG. 1) 52 facing the end of the output shaft 23 in the case 10.

  In the above-described embodiment, the outlet 13 is provided at a position facing the lubricating oil scattering side of the meshing portion 37 of the second fixed gear 32 and the first transmission gear 34. However, the position where the outlet 13 is formed in the case 10 is this. It is not limited to. For example, the outlet 13 can be provided in the storage part 40 of the case 10.

  -In above-mentioned embodiment, although the tank 71 was provided in the communicating path 60, this can also be abbreviate | omitted. Also in this case, the effect according to the effects (1) to (16) of the above embodiment can be achieved.

  In the above embodiment, the oil pump 73 is provided in the communication path 60, but this can be omitted. Also in this case, the effect according to the effects (1) to (16) of the above embodiment can be achieved.

  In the above embodiment, the heat exchanger 72 is provided in the communication path 60, but this can be omitted. Also in this case, the effect according to the effects (1) to (16) of the above embodiment can be achieved.

  In the above embodiment, the transmission 1 in which the communication path 60 is provided in the case 10 is assumed, but the communication path 60 may be omitted. Also in this case, the effect according to the effects (1) to (16) of the above embodiment can be achieved.

  In the above embodiment, the example in which the gear lubrication structure is applied to the in-vehicle transmission 1 has been described. However, the application of the present invention is not limited to the in-vehicle transmission 1, and a pair of gears meshing with each other. If it is an apparatus provided with the lubrication structure which mutually lubricates, it can apply with the aspect according to the said embodiment also about another apparatus (for example, machine tool).

  DESCRIPTION OF SYMBOLS 1 ... Transmission, 4 ... Lubricating apparatus, 10 ... Case, 11 ... Bottom wall, 12 ... Inlet, 13 ... Outlet, 14 ... Upper end, 15 ... Lower end, 21 ... Input shaft, 22 ... Counter shaft, 23 ... Output shaft, 31 ... 1st fixed gear, 32 ... 2nd fixed gear, 33 ... 3rd fixed gear, 34 ... 1st transmission gear, 35 ... 2nd transmission gear, 36 ... Drive gear, 37 ... Meshing part, 40 ... Storage part, DESCRIPTION OF SYMBOLS 41 ... Internal space, 42 ... 1st space, 43 ... 2nd space, 44 ... Guide wall, 45 ... 1st guide part, 46 ... 2nd guide part, 47 ... Entrance guide part, 48 ... Supply port, 50 ... Section Wall 51, peripheral wall 52, side wall 53, 54 upper end, 55 bottom, 56 communication hole, 57 connection wall, 60 communication path, 61 first passage, 62 second passage, 63 second 3 passages, 64 ... 4th passage, 71 ... tank, 72 ... heat exchanger, 7 ... oil pump.

Claims (13)

In a gear lubrication structure comprising a first gear and a second gear meshed with each other, and a reservoir for storing lubricating oil used to lubricate these gears,
Lubricating oil is provided between the first gear and the storage portion, and a partition wall having a communication hole is provided, and lubricating oil is stored between the partition wall and the wall surface of the storage portion. Construction. In the lubricating structure of the gear according to claim 1,
The first gear and the second gear are accommodated in a case;
The gear lubricating structure, wherein the storage portion is provided at a bottom portion of the case. The gear lubricating structure according to claim 2,
The case is provided with an outlet for lubricating oil from the inside of the case and an inlet for lubricating oil into the case, and a communication path connecting the outlet and the inlet to each other outside the case. The gear lubrication structure. In the lubricating structure of the gear according to claim 3,
An oil pump is provided in the middle of the communication path. A gear lubrication structure. The gear lubricating structure according to claim 3 or 4,
The gear lubrication structure, wherein the outlet is provided at a position facing the lubricant scattering side of the meshing portion of the first gear and the second gear. In the gear lubricating structure according to claim 5,
The gear lubrication structure, wherein the inlet is provided on a side opposite to the outlet with respect to the first gear and the second gear. In the lubricating structure of the gear according to any one of claims 3 to 6,
A gear lubrication structure, characterized in that an inlet guide portion for guiding the lubricating oil from the inlet toward the storage portion is provided. In the gear lubrication structure according to any one of claims 1 to 7,
A guide wall that guides the lubricating oil pumped up by the first gear to the meshing portion is provided at a position facing the meshing portion of the first gear and the second gear. Lubrication structure. The gear lubricating structure according to claim 8,
The structure for lubricating a gear, wherein the partition wall and the guide wall are connected to each other. In the lubricating structure of the gear according to any one of claims 1 to 9,
The partition wall is provided above the storage part in the vertical direction,
The communication hole is provided in a bottom portion of the partition wall. A gear lubricating structure. In the gear lubricating structure according to any one of claims 1 to 10,
A gear-lubricating structure, wherein the partition wall has an arc shape corresponding to the shape of the first gear. In the lubricating structure of the gear according to any one of claims 1 to 11,
The gear lubricating structure, wherein the first gear and the second gear are gears of an in-vehicle transmission of a transmission. In an in-vehicle transmission configured to include a gear lubrication structure that lubricates a plurality of gears,
The on-vehicle transmission, wherein the lubricating structure for a gear according to any one of claims 1 to 12 is used as the lubricating structure for the gear.

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