JP6187066B2 - Power transmission device - Google Patents

Description

  The present invention relates to a power transmission device, and more particularly, to a power transmission device in which a partition is provided inside a case and a communication hole is formed in the partition.

  Generally, a power transmission device for a vehicle stores a plurality of gears constituting a speed change mechanism and the like, and lubricating oil for lubricating the gears in a case. In such a power transmission device, by providing a partition wall in the case, the lubricating oil in the case can be prevented from abruptly shifting when the vehicle is traveling uphill, and a communication hole that penetrates the partition wall is formed. Thus, the lubricant is allowed to move to a certain extent between the one side and the other side of the partition wall.

  As a power transmission device in which a partition wall and a communication hole are provided in the case as described above, the one described in Patent Document 1 is known. Patent Document 1 describes a four-wheel drive transmission to which a transfer is coupled, in which a first chamber (first storage chamber) and a second chamber (second storage chamber) are separated from each other by an internal space of a case. In addition, a communication hole (oil passage hole) is formed in the partition wall so that the lubricating oil can go back and forth between the first chamber and the second chamber.

Japanese Patent Laid-Open No. 10-184861

However, in such a conventional power transmission device, since the bottom of the internal space of the case is filled with a large amount of lubricating oil, the amount of lubricating oil that is scraped up by a gear or the like increases. In this case, there is a problem that the power loss due to the scraping of the lubricating oil increases, or the lubricating oil leaks from the breather or the like due to an increase in the splashing lubricating oil.
Further, in the conventional power transmission device, when the opening portion of the communication hole is arranged in a region where the lubricating oil is stirred by a gear or the like, the lubricating oil flows into and out of the communication hole by the flow of the stirred lubricating oil. There was a problem of being disturbed.

  The present invention has been made paying attention to the above problems, and reduces the amount of lubricating oil to be agitated and improves the internal lubricity by allowing the lubricating oil to smoothly pass through the communication hole. An object of the present invention is to provide a power transmission device that can perform the above operation.

A first aspect of the present invention has an internal space for storing the lubricating oil, and the case where the internal space is partitioned into a first chamber and a second chamber by a partition, the first in a state immersed in the lubricating oil A pair of gears arranged in one chamber and meshing with each other, and having a first gear and a second gear on which the shafts are supported by the partition, and below the lubricating oil surface of the partition , And in the area below the first gear and the second gear, an opening on the first chamber side that opens toward the first chamber side and a second chamber side that opens toward the second chamber side and an opening, is constructed from those of the partition wall to form a communication hole that communicates through the axial direction as the first chamber side the second chamber side of the first gear or the second gear Yes.

In the first aspect of the present invention, the opening on the first chamber side of the communication hole is disposed below a region where the lubricating oil agitated by the first gear and the second gear merges. The case includes a cylindrical portion that surrounds at least the first chamber in the circumferential direction of the first gear and the second gear, and is arranged on the inner peripheral surface of the cylindrical portion from the inner peripheral surface. A first bulge that protrudes toward the first gear and bulges from the partition wall toward the first chamber in the axial direction of the first gear so as to cover the lower side of the first gear; In the state of being opposed to the first bulging portion in the circumferential direction, the bulging from the inner circumferential surface toward the second gear side, and the axial direction of the second gear from the partition so as to cover the lower side of the second gear. A second bulging portion that bulges toward the one chamber side, and the case includes the first gear and the second gear. A groove provided between the first raised portion and the second raised portion is formed, and the opening on the first chamber side is opened toward the inside of the groove. It is characterized by .

The second aspect of the present invention, the first gear is arranged close to the opening of the first chamber side of the second gear, wherein the vertical height of the first raised portion first It is preferable to make it higher than 2 raised portions.

As a third aspect of the present invention, a four-wheel drive power transmission mechanism having a counter shaft, a rear wheel output shaft and a front wheel output shaft is disposed in parallel in the case, and the first gear is mounted on the counter shaft. And the second wheel is provided on the rear wheel output shaft so as to be integrally rotatable. The first chamber includes a rear end portion of the counter shaft and a front end portion of the rear wheel output shaft. The second chamber accommodates the rear end portion of the rear wheel output shaft and the front wheel output shaft in a state parallel to each other, and the rear end of the rear wheel output shaft. It is preferable to house a transmission mechanism for transmitting power from the portion to the front wheel output shaft.

As described above, according to the first aspect described above, the amount of the lubricating oil stored around the first gear and the second gear is set so that the first raised portion and the second raised portion are maintained while maintaining the height of the oil level. Therefore, the amount of lubricating oil stirred by the first gear and the second gear can be reduced. As a result, power loss due to the stirring of the lubricating oil can be reduced, and the amount of splashing of the lubricating oil due to the scraping can be reduced to prevent oil leakage from the breather or the like.
Further, in the vicinity of the opening of the communication hole, the flow of the lubricating oil along the circumferential direction of the first gear and the second gear is suppressed by the first and second raised portions , so that the lubricating oil enters and exits the opening. Is prevented from being disturbed. As a result, the lubricating oil can smoothly pass through the communication hole, so that the lubricity inside the power transmission device can be improved.

Further, according to the first aspect described above, even when the opening of the communication hole is arranged below the region where the stirred lubricating oil merges and the circumferential flow becomes stronger, the height of the oil surface The amount of lubricating oil stirred by the gear pair can be reduced while maintaining the above. Further, since the lubricating oil can smoothly pass through the communication hole, the lubricity inside the power transmission device can be improved.

Moreover, according to said 2nd aspect, since the height of the perpendicular direction of the 1st protruding part is made higher than the 2nd protruding part, the flow of the circumferential direction is stronger from the 1st gear than the 2nd gear. The flow of the lubricating oil can be suppressed by the first raised portion having a high height.

According to the third aspect, in the power transmission device configured as a four-wheel drive power transmission mechanism, the first gear provided on the countershaft and the second gear provided on the rear-wheel output shaft. Therefore, it is possible to prevent the lubricating oil in the first chamber from being agitated, and to increase the amount of lubricating oil flowing from the first chamber into the second chamber through the communication hole, so that the transmission mechanism disposed in the second chamber Lubricity can be improved.

FIG. 1 is a diagram showing an embodiment of a power transmission device of the present invention, and is a cross-sectional view showing a schematic configuration of the power transmission device. FIG. 2 is a view showing an embodiment of the power transmission device of the present invention, and is a front view of the front transfer case as viewed from the front. FIG. 3 is a view showing an embodiment of the power transmission device of the present invention, and is a rear view of the front transfer case as seen from the rear. FIG. 4 is a view showing an embodiment of the power transmission device of the present invention, and is a cross-sectional view taken along the line AA of the front transfer case of FIGS. 2 and 3. FIG. 5 is a diagram showing an embodiment of the power transmission device of the present invention, and is a perspective view of a front transfer case as seen from the diagonally upper front side. FIG. 6 is a view showing an embodiment of the power transmission device of the present invention, and is a perspective view of a front transfer case as seen from the obliquely lower front side. 7 is a view showing an embodiment of the power transmission device of the present invention, and is an enlarged perspective view of a communication hole of the front transfer case of FIG.

Hereinafter, embodiments of a power transmission device according to the present invention will be described with reference to the drawings.
1-7 is a figure which shows the power transmission device of one Embodiment based on this invention.
First, the configuration will be described.
A schematic configuration of the power transmission device will be described with reference to FIG. In FIG. 1, the power transmission device 10 includes a case 20 and a four-wheel drive power transmission mechanism 30 to shift the power input from the engine and transmit the shifted power to the rear wheels or the front and rear wheels. It is supposed to be.

  The case 20 includes a front transmission case 21, a rear transmission case 22, a front transfer case 23, and a rear transfer case 24 from the front side. The front transmission case 21 is closed at the front end and the rear end is open, the rear transmission case 22 and the front transfer case 23 are both open at the front and rear ends, and the rear transfer case 24 is open at the front end and closed at the rear end. doing. A clutch housing portion 21 </ b> A that houses a clutch is formed at the front end of the front transmission case 21.

  The case 20 has an internal space 50 formed therein by sequentially bolting the front transmission case 21, the rear transmission case 22, the front transfer case 23, and the rear transfer case 24. The four-wheel drive power transmission mechanism 30 is accommodated, and lubricating oil for lubricating the four-wheel drive power transmission mechanism 30 is stored.

  The four-wheel drive power transmission mechanism 30 includes a speed change mechanism 35 and a transfer unit 45. The power input from the vertically arranged engine is changed by the speed change mechanism 35 and is always transmitted to the rear wheels. The power shifted by the mechanism 35 can be transmitted to the front wheels by switching the transfer unit 45. That is, the four-wheel drive power transmission mechanism 30 is configured as a power transmission mechanism for a part-time four-wheel drive vehicle based on the rear wheel drive system.

  The speed change mechanism 35 is configured as a manual speed change mechanism, and includes an input shaft 31, a counter shaft 32, and a rear wheel output shaft 33. A clutch provided between the front end of the input shaft 31 and the engine is connected, and the driving force from the engine is input via the clutch. The counter shaft 32 is arranged in parallel to the input shaft 31. The input shaft 31 and the counter shaft 32 have a plurality of gear trains and sleeves that form a plurality of forward speeds (for example, 1st to 4th gears). Is provided. The rear wheel output shaft 33 is arranged coaxially with the input shaft 31, and a predetermined forward gear (for example, between the front end portion of the rear wheel output shaft 33 and the rear end portion of the input shaft 31). A gear and a sleeve that form a fifth gear) are provided.

  A first gear 36 and a second gear 37 that mesh with each other are rotated integrally with the counter shaft 32 and the rear wheel output shaft 33 at the rear end portion of the counter shaft 32 and the front end portion of the rear wheel output shaft 33. The power is transmitted from the counter shaft 32 to the rear wheel output shaft 33 via the pair of first gear 36 and second gear 37. The first gear 36 and the second gear 37 constitute a gear pair and a rotating body in the present invention. The rear wheel output shaft 33 is configured to transmit power to the rear wheels via a rear wheel propeller shaft and a rear differential device (not shown). Although not shown, an idler gear that forms a reverse gear is provided between the input shaft 31 and the counter shaft 32.

The transfer unit 45 includes a chain transmission mechanism 42, a sleeve 41 for switching between a two-wheel drive state and a four-wheel drive state, and a front wheel output shaft 34.
The chain transmission mechanism 42 includes a drive sprocket 38, a driven sprocket 39, and a chain 40. The drive sprocket 38 is inserted through the rear wheel output shaft 33 so as to be idle. The driven sprocket 39 is disposed in parallel with the drive sprocket 38 and is fixed to the front wheel output shaft 34 so as to be integrally rotatable. Further, a chain 40 is stretched between the driven sprocket 39 and the drive sprocket 38, and power is transmitted from the drive sprocket 38 to the driven sprocket 39 by this chain 40. The chain transmission mechanism 42 constitutes a transmission mechanism in the present invention.

  The sleeve 41 is provided so as to be able to rotate integrally with the rear wheel output shaft 33 and to slide forward and engage with a side surface of the rear wheel output shaft 33. When the sleeve 41 is positioned rearward, the drive sprocket 38 idles on the rear wheel output shaft 33, and when the sleeve 41 slides forward and engages the rear wheel output shaft 33, The drive sprocket 38 rotates integrally with the rear wheel output shaft 33.

The front wheel output shaft 34 is connected to a front wheel propeller shaft (not shown), and transmits power to the front wheels via the front wheel propeller shaft and the front differential device.
When the sleeve 41 slides to the rear position, the driving force shifted by the speed change mechanism 35 is transmitted only from the rear wheel output shaft 33 to the rear wheel, and the sleeve 41 slides to the front position to the drive sprocket 38. When engaged, the driving force shifted by the speed change mechanism 35 is transmitted from the front wheel output shaft 34 to the front wheels via the transfer portion 45.

  In the present embodiment, the front transfer case 23 includes a cylindrical portion 23A connected to the rear end portion of the rear transmission case 22 and an oval portion 23B connected to the front end portion of the rear transfer case 24. ing. The cylindrical portion 23A is formed in a substantially cylindrical shape when viewed from the front, and surrounds the first gear 37 and the second gear 37 in the circumferential direction of these gears. The oval part 23 </ b> B is formed in a substantially oval shape when viewed from the front, and surrounds the chain transmission mechanism 42 with the rear transfer case 24.

  In the vicinity of the rear end of the cylindrical portion 23A of the front transfer case 23, a partition wall 23C that divides the internal space 50 of the case 20 into a first chamber 51 and a second chamber 52 in the axial direction is formed. As shown in FIG. 4, a communication hole 23D that penetrates the partition wall 23C and communicates the first chamber 51 and the second chamber 52 is formed at the bottom of the partition wall 23C.

The communication hole 23 </ b> D allows a certain amount of lubricating oil to pass, so that when one of the oil levels of the first chamber 51 and the second chamber 52 of the internal space 50 of the case 20 is lowered, the lubricating oil passes from the other. Thus, the lubricity of each part of the power transmission mechanism 30 for a four-wheel drive housed in the internal space 50 is ensured.
The partition wall 23 </ b> C prevents the lubricating oil from moving suddenly and deviating in the internal space 50 when the posture of the power transmission device 10 is inclined in the pitch direction when the vehicle is traveling uphill. .

  Here, in the present embodiment, the first chamber 51 accommodates the rear end portion of the counter shaft 32 and the front end portion of the rear wheel output shaft 33 in a state parallel to each other. The second chamber 52 accommodates the rear end portion of the rear wheel output shaft 33 and the front wheel output shaft 34 in parallel with each other, and houses the chain transmission mechanism 42.

Next, a detailed configuration of the front transfer case 23 will be described.
As shown in FIGS. 2 to 4, the partition wall 23 </ b> C of the front transfer case 23 is formed with a bearing holding hole 23 </ b> F for the rear wheel output shaft 33 and a bearing holding hole 23 </ b> G for the counter shaft 32. Further, a bearing holding hole 23 </ b> H for the front wheel output shaft 34 is formed in the oblong portion 23 </ b> B of the front transfer case 23. The oil level L of the lubricating oil is set at a position where the entire first gear 36 and the lower part of the second gear 37 are immersed in the lubricating oil.

Further, a vent hole 23E penetrating the partition wall 23C is formed above the oil level L of the partition wall 23C. The vent hole 23E is formed between the first chamber 51 and the second chamber 52 of the internal space 50. By allowing the movement of air, the lubricating oil is smoothly moved between the first chamber 51 and the second chamber 52 through the communication hole 23D.
As shown in FIG. 4, the communication hole 23 </ b> D penetrates the partition wall 23 </ b> C in the axial direction of the first gear 36 and the second gear 37, and has openings on the first chamber 51 side and the second chamber 52 side, respectively. 23D1 and opening 23D2.

  Here, the opening 23 </ b> D <b> 1 on the first chamber 51 side is in a region where the lubricating oil is stirred by the first gear 36 and the second gear 37. Specifically, the opening 23D1 is disposed below the region where the lubricating oil stirred by the first gear 36 and the second gear 37 merges. Further, the opening 23D2 on the second chamber 52 side is in a region where the lubricating oil is stirred by the chain transmission mechanism 42.

Since the agitating direction of the lubricating oil by the first gear 36, the second gear 37, and the chain transmission mechanism 42 is a direction orthogonal to the axial direction in which the communication hole 23D extends, the agitated lubricating oil passes through the communication hole 23D. There is a risk that the lubricating oil may be prevented from entering and exiting the openings 23D1 and 23D2.
Therefore, in the present embodiment, as shown in FIGS. 2, 4, and 5, the opening 23D1 of the communication hole 23D is sandwiched between the inner peripheral surface of the first chamber 51 of the cylindrical portion 23A of the front transfer case 23. A pair of first raised portions 61 and second raised portions 62 that are opposed to the circumferential direction of the first gear 36 and the second gear 37 and are raised toward the first gear 36 and the second gear 37 are formed.

  The first raised portion 61 is raised from the inner peripheral surface of the first chamber 51 of the cylindrical portion 23A on the side portion on the first gear 36 side of the opening portion 23D1 of the communication hole 23D. Further, the second raised portion 62 is raised from the inner peripheral surface of the first chamber 51 of the cylindrical portion 23A on the side facing the first raised portion 61 across the opening 23D1.

  In the present embodiment, as shown in FIG. 7, the first gear 36 is disposed closer to the opening 23 </ b> D <b> 1 than the second gear 37. Specifically, the first gear 36 is disposed substantially on the side of the opening 23D1, and the second gear 37 is disposed obliquely above the first gear 36. Further, the height H1 of the first raised portion 61 in the vertical direction (upward direction) is set higher than the height H2 of the second raised portion 62. Furthermore, the vertical height H1 of the first raised portion 61 is substantially constant in the axial direction of the opening 23D1, whereas the height H2 of the second raised portion 62 is spaced apart from the opening 23D1 in the axial direction. It is inclined to become lower as it goes.

  Further, as shown in FIG. 3, the first gear 36 and the second gear 37 are also disposed on the inner peripheral surface of the second chamber 52 of the cylindrical portion 23A of the front transfer case 23 with the opening 23D2 of the communication hole 23D interposed therebetween. A pair of first raised portions 61 and second raised portions 62 that are opposed to each other in the circumferential direction and are raised toward the first gear 36 and the second gear 37 are formed.

  As shown in FIG. 5, by providing the first raised portion 61 and the second raised portion 62, the first raised portion 61 and the second raised portion 62 are provided in the vicinity of the opening 23D1 on the first chamber 51 side. The sandwiched groove 63 is formed. Inside the groove 63, the lubricating oil stirred by the first gear 36 and the second gear 37 does not flow in the circumferential direction of the cylindrical portion 23A. A groove 63 is also formed by the first raised portion 61 and the second raised portion 62 in the vicinity of the opening 23D2 on the second chamber 52 side.

  As shown in FIG. 6, when the cylindrical portion 23A of the front transfer case 23 is viewed from the outside, the first raised portion 61 and the second raised portion 62 are located on the first chamber 51 side from the outer peripheral surface of the cylindrical portion 23A. It becomes a depressed shape. That is, the thickness of the 1st protruding part 61 and the 2nd protruding part 62 is substantially equivalent to the other site | part of the cylindrical part 23A. For this reason, the weight increase of the front transfer case 23 due to the formation of the first raised portion 61 and the second raised portion 62 does not occur.

Next, the operation will be described.
In FIG. 1, when the power transmission device 10 is in a four-wheel drive state, that is, when the sleeve 41 rotates integrally with the drive sprocket 38 and the chain 40 rotates, the lubricating oil is chained on the second chamber 52 side of the front transfer case 23. The oil level L is lowered by being scraped by 40. Then, the lubricating oil moves to the second chamber 52 from the first chamber 51 side where the oil level L is high through the communication hole 23D of the partition wall 23C.
In the first chamber 51, the lubricating oil is agitated by the first gear 36 and the second gear 37 to generate a circumferential flow, and in the second chamber 52, the lubricating oil is agitated by the chain 40 and the circumferential oil flows. Directional flow occurs.

  The power transmission device 10 of this embodiment is opposed to the inner peripheral surface of the cylindrical portion 23A of the front transfer case 23 in the circumferential direction with the openings 23D1 and 23D2 of the communication holes 23D interposed therebetween, and the first gear 36 and the second gear A pair of first raised portions 61 and second raised portions 62 that protrude toward the gear 37 are formed.

  For this reason, the amount of lubricating oil stored around the first gear 36 and the second gear 37 is reduced by the pair of first raised portions 61 and second raised portions 62 while maintaining the height of the oil level L. Therefore, the amount of lubricating oil stirred by the first gear 36 and the second gear 37 can be reduced. As a result, power loss due to the stirring of the lubricating oil can be reduced, and the amount of splashing of the lubricating oil due to the scraping can be reduced to prevent oil leakage from the breather or the like.

  Further, in the vicinity of the opening 23D1 on the first chamber 51 side of the communication hole 23D, the circumferential flow of the lubricating oil by the first gear 36 and the second gear 37 is a pair of the first raised portion 61 and the second raised portion 62. In the vicinity of the opening 23D2 on the second chamber 52 side of the communication hole 23D, the circumferential flow of the lubricating oil by the chain 40 is suppressed by the pair of first raised portions 61 and the second raised portions 62. This prevents the lubricating oil from entering and exiting the openings 23D1 and 23D2. As a result, since the lubricating oil can smoothly pass through the communication hole 23D, the lubricity inside the power transmission device 10 can be improved.

In the power transmission device 10 of the present embodiment, the opening 23D1 on the first chamber 51 side of the communication hole 23D is disposed below a region where the lubricating oil stirred by the first gear 36 and the second gear 37 merges. Yes.
For this reason, even when the opening 23D1 of the communication hole 23D is arranged below the region where the stirred lubricating oil merges and the circumferential flow becomes stronger, the first gear is maintained with the oil level maintained. 36, the amount of lubricating oil stirred by the second gear 37 can be reduced. Further, since the lubricating oil can smoothly pass through the communication hole 23D, the lubricity inside the power transmission device can be improved.

In the power transmission device 10 of the present embodiment, the first gear 36 is disposed closer to the opening 23D1 of the communication hole 23D than the second gear 37, and the first raised portion 61 is the first of the opening 23D1 in the circumferential direction. The second raised portion 62 is raised from the side facing the first raised portion 61 across the opening 23D1, and the height H1 in the vertical direction of the first raised portion 61 is set to the second raised portion. It is higher than 62 height H2.
For this reason, the flow of the lubricating oil from the first gear 36 whose circumferential flow is stronger than that of the second gear 37 is suppressed by the first raised portion 61 whose height in the vertical direction is higher than that of the second raised portion 62. Can do.

  In the power transmission device 10 of the present embodiment, a four-wheel drive power transmission mechanism 30 having a counter shaft 32, a rear wheel output shaft 33 and a front wheel output shaft 34 is arranged in parallel in the case 20. The first gear 36 is provided so as to be integrally rotatable, and the second gear 37 is provided so as to be integrally rotatable on the rear wheel output shaft 33, and the first chamber 51 includes a rear end portion of the counter shaft 32 and the rear wheel output shaft 33. The second chamber 52 accommodates the rear end portion of the rear wheel output shaft 33 and the front wheel output shaft 34 in a state of being parallel to each other, and the rear wheel output shaft. A chain transmission mechanism 42 for transmitting power from the rear end portion 33 to the front wheel output shaft 34 is housed.

  For this reason, in the power transmission device including the four-wheel drive power transmission mechanism 30, the first gear 51 provided in the counter shaft 32 and the second gear 37 provided in the rear wheel output shaft 33 are used in the first chamber 51. Chain transmission mechanism disposed in the second chamber 52 by preventing the lubricant from being stirred and increasing the amount of the lubricating oil flowing from the first chamber 51 into the second chamber 52 through the communication hole 23D. The lubricity of 42 can be improved.

Although the embodiments of the present invention have been disclosed above, it will be apparent to those skilled in the art that changes can be made without departing from the scope of the present invention. All such modifications and equivalents are intended to be included in the following claims.
For example, in this embodiment, the power transmission device 10 includes the four-wheel drive power transmission mechanism 30 in which the transfer unit 45 is integrated with the transmission mechanism 35, but the power transmission device 10 includes the transmission mechanism 35 or the transfer mechanism 35. The structure provided only with one of the parts 45, or the structure provided with mechanisms other than the speed change mechanism 35 and the transfer part 45 may be sufficient. Specifically, the power transmission device 10 may be a transaxle or a differential device.

  DESCRIPTION OF SYMBOLS 10 ... Power transmission device, 20 ... Case, 23 ... Front transfer case, 23A ... Cylindrical part, 23C ... Partition, 23D ... Communication hole, 23D1, 23D2 ... Opening part, 30 ... Power transmission mechanism for four-wheel drive, 32 ... Counter shaft, 33 ... rear wheel output shaft, 34 ... front wheel output shaft, 36 ... first gear (gear pair, rotating body), 37 ... second gear (gear pair, rotating body), 42 ... chain transmission mechanism ( (Transmission mechanism), 50 ... inner space, 51 ... first chamber, 52 ... second chamber, 61 ... first raised portion, 62 ... second raised portion, L ... oil surface

Claims (3)

A case having an internal space for storing lubricating oil, wherein the internal space is partitioned into a first chamber and a second chamber by a partition;
Wherein disposed in the first chamber in a state immersed in the lubricating oil, and a first gear and a second gear their axes are journalled in the partition walls a gear pair mesh with each other,
An opening on the first chamber side that opens toward the first chamber side in an area below the lubricating oil in the partition wall and below the first gear and the second gear; A second chamber side opening that opens toward the second chamber side, and passes through the partition wall in the axial direction of the first gear or the second gear, and the first chamber side and the second chamber side. A power transmission device formed with a communication hole for communicating
The opening on the first chamber side of the communication hole is disposed below a region where the lubricating oil agitated by the first gear and the second gear merges,
The case has a cylindrical portion that surrounds at least the first chamber in the circumferential direction of the first gear and the second gear ,
A first chamber side in the axial direction of the first gear from the partition so as to protrude from the inner peripheral surface toward the first gear side on the inner peripheral surface of the tubular portion and cover the lower side of the first gear. A first bulging portion that bulges toward the second gear side in a state facing the first bulging portion in the circumferential direction of the cylindrical portion, and below the second gear Forming a second raised portion that bulges from the partition wall to the first chamber side in the axial direction of the second gear so as to cover the side,
The case is provided with a groove provided in a region below the first gear and the second gear and sandwiched between the first raised portion and the second raised portion, and the opening on the first chamber side A power transmission device characterized in that a portion is opened toward the inside of the groove . The first gear is disposed closer to the opening on the first chamber side than the second gear,
2. The power transmission device according to claim 1, wherein a height of the first raised portion in a vertical direction is higher than that of the second raised portion . A four-wheel drive power transmission mechanism having a counter shaft, a rear wheel output shaft and a front wheel output shaft is arranged in parallel in the case,
The counter gear is provided with the first gear so as to be integrally rotatable, and the rear wheel output shaft is provided with the second gear so as to be integrally rotatable.
The first chamber stores a rear end portion of the counter shaft and a front end portion of the rear wheel output shaft in a state parallel to each other,
The second chamber houses the rear end portion of the rear wheel output shaft and the front wheel output shaft in parallel with each other, and from the rear end portion of the rear wheel output shaft to the front wheel output shaft. The power transmission device according to claim 2, wherein a transmission mechanism for transmitting power is housed .

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