JP2007298116A - Transfer device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transfer device wherein lubrication oil is prevented from leaking out from a breather hole to outside. <P>SOLUTION: The transfer device 1 is provided with a storing space 14 for storing a gear mechanism 6, a breather chamber 15 adjacent to the storing space 14 and communicating with the breather hole 27 and a plate 16 for isolating the storing space 14 and the breather chamber 15. The plate 16 is provided with a first communicating hole 18 for communicating with the storing space 14 and the breather chamber 15 and a cover 19 for covering the fist communication hole 18 and having an opening at a downstream side in a rotation direction of the gear mechanism 6. Thus, even if the lubrication oil is scattered with rotation of the gear mechanism 6, the cover 19 prevents the communication oil from directly colliding to an inside face of the breather chamber 15 via the first communication hole 18 and prevents the lubrication oil from leaking out from the breather hole 27. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a transfer device having a breather hole that communicates the inside of a case with the outside, and more particularly, to a partition member that separates a breather chamber having a breather hole in a case and a storage space for storing a distribution gear mechanism. The present invention relates to a transfer device having a communication hole.

  In general, a transfer device that is mounted on a four-wheel drive type vehicle and distributes drive rotation via the transmission to the front and rear wheels is equipped with a breather hole that communicates the inside of the case with the outside of the case, eliminating the pressure difference between the inside and outside of the case. Thus, the transfer device is protected (see, for example, Patent Document 1). In such a transfer device, a breather chamber is provided that is isolated from a storage space in which a gear mechanism for transmitting the rotation of the input shaft to the drive wheel is stored, and the breather hole is formed between the breather chamber and the outside of the case. Has been proposed that is configured to communicate with each other (see, for example, Patent Document 1). Thus, by isolating the storage space of the gear mechanism and the breather chamber in which the breather hole communicates, the lubricant that lubricates the gear mechanism is prevented from leaking from the breather hole.

JP 2000-108703 A

  By the way, in the transfer device that separates the storage space and the breather chamber as described above, it is necessary to provide a communication hole for ventilating the storage space and the breather chamber. On the other hand, for example, the vehicle is inclined. In some cases, the lubricating oil may enter the breather chamber through the communication hole. In this case, it is necessary to drain the lubricating oil. Therefore, the communication hole is capable of venting the storage space and the breather chamber, but is capable of draining the lubricating oil that has entered the breather chamber, and is located near the end of the breather chamber, that is, near the inner surface of the breather chamber. It is necessary to provide in.

  However, in the storage space where the gear mechanism of the transfer device is disposed, the lubricating oil is scattered inside the storage space while lubricating the gear mechanism as the gear mechanism rotates, so that the end of the breather chamber Lubricating oil that has passed through the communication hole provided in the air and splashed into the breather chamber collides with the inner surface of the breather chamber, for example, repels in the form of a mist and leaks outside through the breather hole together with air. There was a risk of it.

  Accordingly, an object of the present invention is to provide a transfer device that solves the above-mentioned problems by preventing the lubricating oil from colliding with the inner surface of the breather chamber.

According to the first aspect of the present invention (see, for example, FIGS. 1 to 5), a gear mechanism (for example, 6) for transmitting the rotation of the input shaft (2) to the driving wheel is included in the case (20), and The gear mechanism (for example, 6) is provided with a breather hole (27) for communicating the inside of the case (20) with the outside, and the lubricating oil sealed in the case (20) is based on the rotation of the input shaft (2). In the transfer device (1) which is lubricated while being stirred and / or sprinkled with centrifugal force by rotation of
The lubricating oil communicates with the breather hole (27) and is separated from the storage space (14) in which the gear mechanism (for example, 6) is stored by the partition member (16). A breather chamber (15) arranged to be above the oil level (32) is provided in the case (20),
The partition member (16) communicates the storage space (14) with the end portion (35) of the breather chamber (15) to remove oil from the breather chamber (15) and the storage space (14). A first communication hole (18) for venting the breather chamber (15);
The partition member (16) covers the first communication hole (18) and faces the downstream side in the rotation direction (ω1 direction) of the gear mechanism (for example, 6) based on the rotation of the input shaft (2). Provided with an open cover member (19),
The transfer device (1) is characterized in that.

According to a second aspect of the present invention (see, for example, FIGS. 3 to 5), the breather chamber (15) is formed in a half donut shape, and is disposed across the upper outer periphery of the input shaft (2).
The first communication hole (18) is provided at an end (35) on the downstream side in the rotation direction (ω1 direction) of the gear mechanism (for example, 6) in the half-doughnut-shaped breather chamber (15),
The opening direction of the cover member (19) is the lower side,
A transfer device (1) according to claim 1, characterized in that

According to the third aspect of the present invention (see, for example, FIGS. 3 to 5), the partition member (16) is configured to rotate the gear mechanism (for example, 6) in the storage space (14) and the breather chamber (15). A second communication is provided for communicating with the upstream end (36) in the (ω1 direction) to vent oil between the breather chamber (15) and the storage space (14) and the breather chamber (15). Having holes (24),
A transfer device (1) according to claim 2, characterized in that

According to a fourth aspect of the present invention (see, for example, FIGS. 3 and 5), the case (20) is formed of the gear mechanism (for example, 6) of the second communication hole (24) in the storage space (14). It is disposed upstream of the rotational direction (ω1 direction) and has a rib portion (30) that reinforces the strength of the case (20).
The transfer device (1) according to claim 3, wherein the transfer device (1) is provided.

The present invention according to claim 5 (see, for example, FIG. 1), the gear mechanism (for example, 6) is a distribution gear mechanism (6) that distributes the rotation of the input shaft (2) to the front and rear wheels.
The transfer device (1) according to any one of claims 1 to 4, wherein the transfer device (1) is provided.

  In addition, although the code | symbol in the said parenthesis is for contrast with drawing, this is for convenience for making an understanding of invention easy, and has no influence on the structure of a claim. It is not a thing.

  According to the first aspect of the present invention, the partition member is provided with the cover member that covers the first communication hole and opens toward the downstream side in the rotation direction of the gear mechanism based on the rotation of the input shaft. Lubricating oil scattered with rotation can be prevented from directly colliding with the inner surface of the breather chamber, and the lubricating oil can be prevented from leaking from the breather hole.

  According to the second aspect of the present invention, the first communication hole is provided at the downstream end of the rotation direction of the gear mechanism in the half-doughnut-shaped breather chamber, and the opening direction of the cover member is the lower side. When removing oil, the cover can reliably remove oil, and the lubricating oil splashed with the rotation of the gear mechanism directly collides with the inner surface of the breather chamber. Can be prevented.

  According to the third aspect of the present invention, the partition member that separates the half-doughnut-shaped breather chamber has the first communication hole at the downstream end in the rotational direction of the gear mechanism and the second communication at the upstream end. Since the storage space and the breather chamber communicate with each other, for example, when the vehicle is inclined, even if one communication hole is below the oil level, The communication hole is above the oil level, and the ventilation of the storage space and the breather chamber can be ensured more reliably.

  According to the fourth aspect of the present invention, the case is disposed on the upstream side in the rotation direction of the gear mechanism of the second communication hole in the accommodation space, and has a rib portion that reinforces the strength of the case. Although it can reinforce the strength of the case, the flow of the lubricating oil on the upstream side is blocked in the rotational direction of the gear mechanism from the second communication hole, and the lubricating oil is prevented from entering from the second communication hole. Can be made possible.

  According to the fifth aspect of the present invention, since the gear mechanism is a distribution gear mechanism that distributes the rotation of the input shaft to the front and rear wheels, more lubrication is required than a gear such as a counter gear, and the gear mechanism is scattered in the storage space. Although the amount of lubricating oil to be increased increases, it is possible to prevent the scattered lubricating oil from directly colliding with the inner surface of the breather chamber.

  Hereinafter, embodiments according to the present invention will be described with reference to FIGS. 1 to 5.

  The transfer device 1 according to the present invention is mounted on, for example, an engine vertical four-wheel drive vehicle, and receives rotation output from the engine and shifted by a transmission (not shown), and is applied to front wheels and rear wheels. It is configured to output in a distributed form.

  As shown in FIG. 1, the transfer device 1 includes an input shaft 2, a gear mechanism (distribution gear mechanism) 6, a rear output shaft 3, a sleeve shaft 7, a counter gear unit 5, and a front output unit 4. And are housed in a case 20 (see FIG. 2) that is integrally formed by joining these parts. Further, in the transfer device 1, the input shaft 2, the gear mechanism 6, the rear output shaft 3, and the sleeve shaft 7 are coaxially arranged to constitute the first shaft CT 1, and the counter shaft 5 b of the counter gear unit 5 is the first one. A 2-axis CT2 is configured, and the front output shaft 4b of the front output unit 4 is a third axis CT3. Of these three axes, the first axis CT1, the second axis CT2, and the third axis CT3, the second axis CT2 is disposed obliquely below the first axis CT1, and the third axis CT3 is the second axis CT2. It is arranged at a position opposite to the first axis CT1 and parallel to the second axis CT2, that is, it is arranged in a substantially letter shape in side view. The positional relationship between the first axis CT1, the second axis CT2, and the third axis CT3 should be set according to the mountability of the vehicle, and is not limited to this arrangement.

  The first shaft CT1 includes an input shaft 2, a gear mechanism 6, a rear output shaft 3, and a sleeve shaft 7 on the same axis. The input shaft 2 is connected to a transmission (not shown), and the rear output shaft 3 is not shown. Are connected to the rear left and right drive wheels via a rear propeller shaft and a rear differential gear (not shown). The sleeve shaft 7 is formed in a sleeve shape so as to cover the input shaft 2, and has a gear 7 a formed integrally.

  The second shaft CT2 includes a counter shaft 5b of the counter gear portion 5. The counter shaft 5b has a gear 5a formed integrally with the above-described gear 7a.

  The third shaft CT3 includes a front output shaft 4b of the front output unit 4, and the front output shaft 4b has a gear 4a formed integrally or by separate spline fitting. Is engaged with the gear 5a. The front output shaft 4b is connected to the front left and right drive wheels via a front propeller shaft (not shown) and a front differential gear (not shown).

  The gear mechanism 6 is composed of a planetary gear, and includes a gear 6a connected to the sleeve shaft 7 as a sun gear, an internal gear 6d connected to the rear output shaft 3 as a ring gear, and a gear 6b as a pinion. A carrier 6c connected to the input shaft 2 and supporting the pinion 6b is provided. Further, the pinion 6b meshes with the sun gear 6a and the ring gear 6d, respectively.

  Next, the operation of the transfer device 1 according to the present invention will be described with reference to FIG.

  In the transfer device 1, for example, output rotation output from the engine and shifted by the transmission is input to the input shaft 2. The rotation input to the input shaft 2 is transmitted to the gear mechanism 6, and the rotation transmitted to the gear mechanism 6 is transmitted from the carrier 6c to the rear output shaft 3 through the pinion 6b and the ring gear 6d. Further, it is transmitted from the carrier 6c to the sleeve shaft 7 through the pinion 6b and the sun gear 6a.

  The rotation to the ring gear 6d and the sun gear 6a is such that when the vehicle is running straight, the sun gear 6a, the pinion 6b, and the ring gear 6d rotate integrally, and the resistance applied to each of the ring gear 6d and the sun gear 6a is changed. When this occurs, the differential rotation of the ring gear 6d and the sun gear 6a with respect to the pinion 6b is absorbed.

  Thus, the rotation transmitted to the rear output shaft 3 is transmitted to the rear left and right drive wheels via a rear propeller shaft and a rear differential gear (not shown). The rotation transmitted to the sleeve shaft 7 is transmitted to the front output unit 4 via the counter gear unit 5, and a front propeller shaft and a front differential gear (not shown) are transmitted from the front output shaft 4 b of the front output unit 4. Is transmitted to the front left and right drive wheels. With the above operation, the drive rotation input to the transfer device 1 is transmitted to the front, rear, left and right drive wheels, and the four-wheel drive state is set.

  Next, the transfer device 1 according to the embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 2, the transfer case 20 of the transfer apparatus 1 includes a front case 11 and a rear case 12 including a center case 12a and an end case 12b. The front case 11, the center case 12a, and the end case 12b are It is fastened by bolts 25, 26, etc. to constitute an integral case. The transfer case 20 has a generally hollow shape, and an input shaft 2, a rear output shaft 3, a gear mechanism 6, and a sleeve shaft 7 are rotatably accommodated in the hollow portion.

  The sleeve shaft 7 is formed by a bearing 13 and a bearing 21 fitted in the center case 12a and positioned in the axial direction by the snap ring 22 in a hollow portion on the front side (X1 direction side in FIG. 2) of the transfer case 20. It is supported rotatably. The sun gear 6a (see FIG. 1) of the gear mechanism 6 described above is connected to the rear side (X2 direction side in FIG. 2) of the sleeve shaft 7, and between the bearing 13 and the bearing 21 of the sleeve shaft 7. The above-mentioned gear 7a is formed in this part.

  The rear output shaft 3 is connected to the ring gear 6d (see FIG. 1) of the gear mechanism 6 on the front side (X1 direction side in FIG. 2), and is rotatably supported by a bearing (not shown) in the end case 12b. Has been.

  The input shaft 2 is coaxially disposed in the hollow portion of the sleeve shaft 7 and is rotatably supported by a ball bearing 23 interposed between the input shaft 2 and the sleeve shaft 7. The input shaft 2 is formed so that the front side (X1 direction side in FIG. 2) can be splined to the output shaft of the transmission (not shown), and the rear side (X2 direction side in FIG. 2) is The gear mechanism 6 is connected to a carrier 6c (see FIG. 1). Further, the input shaft 2 is fitted so that the rear end (X2 direction side in FIG. 2) is rotatable with the rear output shaft 3 (not shown), and also rotates with the rear output shaft 3. It is supported freely. That is, the input shaft 2 is rotatably supported with respect to the transfer case 20 via the output shaft 3 and the sleeve shaft 7 (and the bearings 13, 21, 23 and the like that support them).

  On the other hand, in the counter gear portion 5 (not shown), the counter shaft 5b (see FIG. 1) forming the second shaft CT2 in the front case 11 is rotatable with respect to the front case 11 by bearings 39a and 39b. It is supported by. A gear 5a is integrally formed on the outer peripheral side between the bearings 39a and 39b of the counter shaft 5b and meshes with the gear 7a of the sleeve shaft 7 described above. It meshes with the gear 4a of the output shaft 4b (see FIG. 1). Further, a gear type oil pump is connected to the counter shaft 5b on the front side (X1 direction side in FIG. 2) (not shown), an oil chamber 33, oil passages 38 and 31, and a seal ring 44, Lubricating oil is supplied to the gear mechanism 6 via an oil passage 40 formed by a space between the input shaft 2 and the sleeve shaft 7 sealed by 45, and will be described in detail later with respect to a hole provided in the ring gear 6d. It is comprised so that centrifugal force may be spread | dispersed in the storage space 14 to perform.

  Subsequently, the breather chamber and its peripheral part, which are essential parts of the present invention, will be described in detail. In addition, the longitudinal cross-sectional view of the transfer apparatus 1 shown in FIG. 3 is an AA arrow sectional view shown by the AA line in the cross-sectional view shown in FIG. Therefore, the gear mechanism 6 is arranged on the front side of the drawing in FIG.

  As shown in FIGS. 1 and 2, the gear mechanism 6 is housed in a housing space 14 formed in the hollow portion of the center case 12a, the sun gear 6a is in the sleeve shaft 7, the ring gear 6d is in the rear output shaft 3, Carriers 6c are respectively connected to the input shaft 2, and are thereby supported rotatably with respect to the transfer case 20. Further, the rotation direction of at least the ring gear 6d based on the rotation of the input shaft 2 is configured to be the ω1 direction (see FIG. 3).

  As shown in FIG. 3, the housing space 14 houses the gear mechanism 6 (see FIG. 1), and the inside of the housing space 14 rotates substantially as shown by the oil level 32. Soaked in lubricating oil to the center. In addition, an oil draining rib (rib portion) 30 is provided inside the storage space 14 so as to protrude into the storage space 14 at a position upstream in the ω1 direction from a position where a bolt 34 described later is disposed. Have.

  The breather chamber 15 is adjacent to the front side (X1 direction side in FIG. 2) of the storage space 14 in the center case 12a, is located on the outer peripheral side of the bearing 21, and is formed on a substantially upper half side with respect to the axial center position. A semi-annular recess, that is, a semi-doughnut-shaped recess, with the outer peripheral side having an inner peripheral surface 15a having an inner diameter smaller than the inner diameter of the storage space 14 and the inner peripheral side having an outer diameter larger than the outer diameter of the bearing 21. On the outer peripheral surface 15b, the front side (X1 direction side in FIG. 2) is a side surface 15c provided with rib portions 37, 37... (See FIG. 5), the downstream side in the ω1 direction is the end surface 15d, and the opposite upstream side is the end surface 15e. The rear side, that is, the storage space 14 side is separated from the storage space 14 by a plate (partition wall member) 16. Further, the breather chamber 15 is provided with a breather hole 27 that communicates with the outside above the transfer device 1, and an opening on the outside of the breather hole 27 can be coupled with, for example, a hose. A coupling member 29 is connected to the.

  The plate 16 separates the storage space 14 and the breather chamber 15, and is formed in a semi-hollow disk shape along the breather chamber 15. Further, the first communication hole 18 that communicates the storage space 14 and the breather chamber 15 is provided at the end 35 on the ω1 direction side, and the vehicle is in a horizontal state at the end 36 on the upstream side in the ω1 direction. A second communication hole 24 that communicates between the storage space 14 and the breather chamber 15 is provided so as to be above the oil level 32 of the lubricating oil in a normal state. Further, the plate 16 is fixed to the center case 12a by a bolt 17 on the ω1 direction side from the end surface 15d of the breather chamber 15 and by a bolt 34 on the upstream side in the ω1 direction from the end surface 15e. Further, as shown in FIG. 4, the plate 16 includes an opening 28 that opens toward the ω1 direction so as to cover the first communication hole 18, and includes a cover (cover member) 19 having a semi-dome shape. ing.

  Next, the operation of the breather chamber and its peripheral part as the main part of the present invention described above will be described.

  As shown in FIG. 3, in the storage space 14, the gear mechanism 6 that is substantially immersed in the lubricating oil to the center of rotation rotates in the ω <b> 1 direction based on the rotation of the input shaft 2, thereby stirring the lubricating oil. Further, the lubricating oil adhering to the surface is scattered by centrifugal force. Further, as described above, the ring gear 6d of the gear mechanism 6 is provided with a hole, and is scattered so as to be ejected from the hole by the centrifugal force accompanying the rotation of the gear mechanism 6. As described above, the lubricating oil is scattered in the storage space 14 by the centrifugal force of the gear mechanism 6, and is lubricated along the rotation direction ω <b> 1 of the gear mechanism 6 as indicated by the white arrow in FIG. 5. An oil flow 41 is generated.

  In the state where the gear mechanism 6 is rotating, in the first communication hole 18, splashed lubricant splashes from the upstream side in the ω <b> 1 direction along the lubricant flow 41, but is blocked by the cover 19. The lubricating oil that has passed through the first communication hole 18 and scattered in the breather chamber 15 collides with the inner side surface (particularly the end surface 15d) of the breather chamber 15 and does not repel, for example, in the form of a mist. Further, the cover 19 has an opening 28 on the ω1 direction side (downstream side in the rotation direction) and directed downward, so that the space between the accommodation space 14 and the breather chamber 15 can be vented. In addition, for example, when the vehicle is tilted, the lubricating oil that has entered the breather chamber 15 can be removed without obstructing.

  In addition, in the second communication hole 24 portion, even if the splash of the lubricating oil splashes along the flow 41 of the lubricating oil and passes through the second communication hole 24, the breather chamber 15 has the direction of the flow 41 in the direction of the flow 41. There is no wall that collides vertically, and the lubricating oil does not easily form a mist. Further, the flow 41 of the lubricating oil that is being stirred by the gear mechanism 6 below the oil level 32 is blocked by the oil draining rib 30. As a result, the agitated lubricating oil is hardly applied to the vicinity of the second communication hole 24 on the ω1 direction side near the oil draining rib 30, that is, the influence of the flow of the lubricating oil is weakened, and the second communication hole Thus, it is possible to prevent the intrusion of the lubricating oil from 24.

  Further, for example, when the vehicle is inclined, the position of the oil surface 32 that is a straight line passing through the rotation center of the gear mechanism 6 moves (turns) inside the storage space 14. That is, when the oil level on the downstream end portion 35 side in the ω1 direction of the semi-hollow disk-shaped plate 16 rises, the oil level on the upstream end portion 36 side in the ω1 direction descends, and the end portion When the oil level on the 36 side rises, the oil level on the end 35 side descends. Even in this case, the first and second communication holes 18, 24 described above are disposed at substantially symmetrical positions with respect to the rotation center of the gear mechanism 6, and thus are provided at the end portion 35. Even if the first communication hole 18 is below the oil level, the second communication hole 24 provided in the end portion 36 is above the oil level, and conversely, the second communication hole 24 is below the oil level. Even so, the first communication hole 18 is above the oil level. Therefore, even if one of the communication holes is below the oil level 32 and air cannot pass therethrough, the one communication hole is always above the oil level 32, and the communication hole is located above the oil level 32. Thus, the storage space 14 and the breather chamber 15 can be ventilated.

  On the other hand, in the state where the gear mechanism 6 is rotating, in the storage space 14, an air flow along the plate 16 is generated in the same direction as the rotation direction ω <b> 1 of the gear mechanism 6 as the gear mechanism 6 rotates. With this air flow, in the cover 19 covering the first communication hole 18, the air in the vicinity of the opening 28 formed toward the ω1 direction (downstream in the rotational direction) is sucked into the downstream side in the ω1 direction. Is done. When the air in the vicinity of the opening 28 is sucked downstream in the ω1 direction, the vicinity of the opening 28 becomes slightly negative with respect to the inside of the cover 19 and the first communication hole 18, and the breather chamber 15 An air flow is generated toward the opening 28 via the first communication hole 18. As a result of such an air flow, the lubricating oil scattered near the downstream end portion 35 in the ω1 direction enters the breather chamber 15 through the first communication hole 18 against the air flow. It becomes difficult.

  Also in the vicinity of the second communication hole 24, as with the first communication hole 18, an air flow along the plate 16 is generated in the same direction as the rotation direction ω <b> 1 of the gear mechanism 6 as the gear mechanism 6 rotates. Due to this air flow, air in the vicinity of the opening portion of the second communication hole 24 on the storage space 14 side is sucked downstream in the ω1 direction, and the vicinity of the opening portion of the second communication hole 24 becomes negative pressure. . When the vicinity of the opening portion of the second communication hole 24 becomes negative pressure, an air flow from the breather chamber 15 side to the storage space 14 side through the second communication hole 24 is generated. Due to such an air flow, the lubricating oil scattered near the upstream end portion 36 in the ω1 direction enters the breather chamber 15 through the second communication hole 24 against the air flow. It becomes difficult.

  When the internal pressure of the storage space 14 becomes higher than the internal pressure of the breather chamber 15, air flows from the storage space 14 to the breather chamber 15. At this time, since the first communication hole 18 is covered with the cover 19 having the opening portion 28 opened downward toward the downstream side in the ω1 direction, the lubrication scattered in the storage space 14. It is difficult to inhale oil.

  Further, even when air flows from the storage space 14 to the breather chamber 15 in one second communication hole 24, the gear mechanism 6 is rotated below the oil level 32 as described above. Thus, the flow of the lubricating oil stirred by the gear mechanism 6 is blocked by the oil draining rib 30, so that the stirred lubricating oil is not easily applied to the second communication hole 24, and the lubricating oil is difficult to enter from the second communication hole 24. . Further, even if splashes of the lubricating oil splash along the lubricating oil flow 41 and pass through the second communication hole 24, there is no wall surface that collides perpendicularly to the direction of the flow 41 in the breather chamber 15, and the lubricating oil Is unlikely to form a mist, and the lubricating oil does not leak from the breather hole 27.

  As described above, according to the transfer device 1 of the present invention, the cover 19 that covers the first communication hole 18 in the plate 16 and opens toward the downstream side in the rotation direction of the gear mechanism 6 based on the rotation of the input shaft 2 is provided. Since it is provided, it can be prevented from directly colliding with the inner surface of the breather chamber 15 of the lubricating oil that is scattered as the gear mechanism 6 rotates, and the lubricating oil is prevented from leaking from the breather hole. be able to.

  Further, the first communication hole 18 is provided in the end portion 35 on the downstream side in the rotation direction of the gear mechanism 6 in the half-doughnut-shaped breather chamber 15, and the opening direction of the cover 19 is on the lower side, so that oil is drained. Even when the cover 19 is not obstructed, the oil can be surely drained, and the lubricating oil scattered with the rotation of the gear mechanism 6 directly collides with the inner surface of the breather chamber 15. Can be prevented.

  Further, the plate 16 is provided with the first communication hole 18 at the downstream end 35 in the rotational direction of the gear mechanism 6 and the second communication hole 24 at the upstream end 36, respectively. 15, that is, the first and second communication holes 18, 24 are arranged at positions that are substantially symmetrical with respect to the rotation center of the gear mechanism 6. For example, when the vehicle is inclined Even if one of the communication holes is below the oil level 32, the one communication hole is above the oil level 32, so that the ventilation of the storage space 14 and the breather chamber 15 can be ensured more reliably.

  Further, the center case 12a is disposed on the upstream side in the rotation direction of the gear mechanism 6 of the second communication hole 24 in the storage space 14, and has an oil draining rib 30 that reinforces the strength of the center case 12a. While the strength of the center case 12a can be reinforced, the flow of the lubricating oil upstream from the second communication hole 24 in the rotational direction of the gear mechanism 6 is blocked, and lubrication from the second communication hole 24 is achieved. It is possible to prevent oil from entering.

  Further, the gear mechanism 6 is a distribution gear mechanism that distributes the rotation of the input shaft 2 to the front and rear wheels, and therefore requires more lubrication than a gear such as a counter gear, for example, and the amount of lubricating oil scattered in the storage space 14 However, it is possible to prevent the scattered lubricating oil from directly colliding with the inner peripheral surface of the breather chamber 15.

  In the transfer device 1 according to the present embodiment described above, the storage space 14 and the breather chamber 15 are separated from each other by the plate 16, but the plate 16 is formed integrally with the center case 12a. It does not matter.

  Further, in the present embodiment, the shape of the cover 19 has been described as a semi-dome shape, but any shape such as a semi-triangular pyramid shape can be used as long as the shape opens to the downstream side in the rotation direction of the gear mechanism 6. Any shape may be used.

  In the present embodiment, the breather chamber 15 has been described as a half-doughnut shape. However, if the first communication hole 18 is provided at the downstream end of the gear mechanism 6 in the rotation direction, the breather chamber 15 The present invention can be applied to any shape.

  In the present embodiment, it has been described that the plate 16 includes the first communication hole 18 and the second communication hole 24, but a cover member that is opened downstream in the rotation direction of the gear mechanism 6 is provided. The number of communication holes may be one as long as it is the first communication hole 18.

  In the present embodiment, the gear mechanism 6 is described as an example of a distribution gear mechanism that distributes the rotation of the input shaft 2 to the front and rear wheels. However, for example, a counter gear or the like is associated with the rotation in the storage space 14. Any gear mechanism may be used as long as the gear is lubricated while the lubricating oil is scattered. Further, the distribution gear mechanism using the planetary gear has been described. However, for example, any torque transmission mechanism that can distribute the drive rotation input from the input shaft 2 to the rear output shaft 3 and the sleeve shaft 7 can be used. It does n’t matter.

The skeleton figure which shows the transfer apparatus which concerns on embodiment of this invention. The cross-sectional view which shows a part of transfer apparatus. AA arrow sectional drawing of FIG. The perspective view which shows the cover member provided in the partition member. BB arrow sectional drawing of FIG.

Explanation of symbols

1 Transfer device 2 Input shaft 6 Distribution gear mechanism (gear mechanism)
14 Storage space 15 Breather chamber 16 Bulkhead member (plate)
18 First communication hole 19 Cover member (cover)
20 case (transfer case)
24 2nd communicating hole 27 Breather hole 30 Rib part (oil cutting rib)
32 Oil level 35 End (ω1 direction side)
36 End (Upstream in the direction of rotation)
ω1 direction Rotation direction of gear mechanism

Claims (5)

A gear mechanism for transmitting the rotation of the input shaft to the drive wheel is included in the case, and provided with a breather hole that communicates the inside of the case with the outside, and the lubricating oil sealed in the case is supplied to the input shaft. In a transfer device that is lubricated while being stirred or / and dispersed with centrifugal force by rotation of the gear mechanism based on rotation,
A breather chamber that communicates with the breather hole, is separated from a storage space in which the gear mechanism is stored by a partition member, and is disposed so that an end portion is above the oil level of the lubricating oil in a normal state; In the case,
The partition member communicates the storage space and an end of the breather chamber, and has a first communication hole for draining the breather chamber and venting the storage space and the breather chamber,
The partition member is provided with a cover member that covers the first communication hole and opens toward the downstream side in the rotation direction of the gear mechanism based on the rotation of the input shaft.
A transfer device characterized by that. The breather chamber is formed in a half donut shape, and is disposed across the upper outer periphery of the input shaft,
The first communication hole is provided at an end portion on the downstream side in the rotation direction of the gear mechanism in the half-doughnut-shaped breather chamber,
The opening direction of the cover member is the lower side,
The transfer device according to claim 1. The partition member communicates the storage space with the upstream end of the breather chamber in the rotation direction of the gear mechanism, and drains the breather chamber and ventilates the storage space and the breather chamber. Having a second communication hole,
The transfer device according to claim 2. The case is disposed on the upstream side in the rotation direction of the gear mechanism of the second communication hole in the storage space, and has a rib portion that reinforces the strength of the case.
The transfer device according to claim 3. The gear mechanism is a distribution gear mechanism that distributes rotation of the input shaft to front and rear wheels.
5. The transfer device according to claim 1, wherein

Images