JP6489178B2 - Vehicle transfer device - Google Patents

Description

  The present invention relates to a transfer structure mounted on a four-wheel drive vehicle.

  A transfer device mounted on a vehicle transmits a driving force output from a driving source to a rear wheel as one driving wheel via a rear wheel output shaft as a driving shaft extending rearward of the vehicle body. The driving force is distributed to the front wheel output shaft as another driving shaft arranged in parallel with the output shaft, and the driving force transmitted to the front wheels is taken out.

  In such a transfer device, a coupling for taking out the driving force for the front wheels is arranged on the output shaft for the rear wheels, and the driving force taken out by the coupling is used as a power transmission mechanism such as a pair of gears and a chain. Thus, it is transmitted to the front wheel output shaft, and the front wheels can be driven in addition to the rear wheels.

  The transfer device has an accommodation space for accommodating the power transmission mechanism. Usually, at the bottom of the housing space, a lubricating oil for lubricating a meshing portion, a bearing, and the like with the upper rotating member located above by scraping up by the lower rotating member located below in the power transmission mechanism. Is stored.

  The inside of the accommodation space may increase in pressure due to a rise in temperature of the lubricating oil accompanying rotation of the power transmission mechanism. As described above, when the internal pressure of the housing space increases, the lubricating oil may leak from the seal portion. Therefore, a breather device may be provided in the housing space to prevent the internal pressure from increasing.

  In general, the breather device includes a breather volume chamber that communicates with the housing space and separates air generated in the housing space from liquid or mist-like lubricating oil, and a breather that communicates from the breather volume chamber to the outside. There may be provided a passage and a breather valve provided at the outlet of the breather passage and having a function as a valve that opens when the internal pressure of the breather volume chamber rises above a certain level and allows air to escape to the outside.

  Further, the lubricating oil in the housing space may be scraped up by the rotation of the lower rotating member and scattered up to the upper part of the internal space, etc., depending on the scattering state, the breather volume exceeding a certain limit. May enter the room. In this case, as described above, when the internal pressure of the breather chamber increases and air is released to the outside, inconveniences such as lubricating oil flowing out through the breather valve occur.

  On the other hand, the transfer device disclosed in Patent Document 1 has a transfer case composed of a first case, a second case, and a third case that are divided into three in the axial direction. An input unit to which the driving force from the machine is input, a center differential unit that distributes the driving force to the front wheels and the rear wheels, and a chain transmission unit (chain-type power transmission mechanism) that transmits the allocated driving force to the front wheels Contained.

  And in the said transfer apparatus, the breather apparatus is arrange | positioned in the 1st case separated from the 3rd case in which the said chain transmission part is accommodated. Specifically, the breather device is provided on an upper portion of the first case on the transmission side, which is a portion that is far from the lubricating portion provided inside the transfer case and is difficult for the lubricating oil to enter. Thereby, it arrange | positions so that the lubricating oil scattered in the said transfer case may not leak outside.

JP2004-299497

  By the way, from the request | requirement of expansion of a passenger | crew's vehicle interior space, it is calculated | required to make the tunnel of the vehicle in which the said transfer apparatus is arrange | positioned small.

  In addition, a change rod for a transmission may be disposed on the upper side of the transfer device inside the tunnel. In particular, when the breather device is provided on the upper portion of the transfer device, depending on the operation locus of the change rod. May interfere with the breather device.

  For example, it is conceivable to reduce the capacity of the breather volume chamber of the breather device. However, in this case, there is a problem that the function of separating the air from the liquid or mist-like lubricating oil cannot be maintained.

  Therefore, the present invention is, for example, a longitudinally-installed vehicle in which the transfer device is disposed inside the tunnel, and the breather volume of the breather device in the vehicle transfer device is avoided while avoiding an increase in the space of the tunnel. The problem is to secure the capacity of the room.

  In order to solve the above-described problems, a vehicle transfer device according to the present invention is configured as follows.

First, the invention described in claim 1
A power transmission mechanism that transmits power between a drive shaft that transmits power to one of the front and rear drive wheels and another drive shaft that is arranged in parallel to the drive shaft;
A case for storing the power transmission mechanism and storing lubricating oil at the bottom thereof;
A breather device provided in the case;
The case has a main body having an accommodating space for accommodating the power transmission mechanism at one end in the axial direction;
A vehicle transfer device comprising a cover portion that closes an open portion of the main body portion on the accommodation space side,
A bearing on one side of the upper drive shaft among the drive shafts is provided in the cover portion,
The breather device includes a first volume chamber provided in an upper portion of the housing space of the main body,
A second volume chamber provided above the bearing;
Breather passages respectively leading to the first volume chamber and the second volume chamber;
A baffle plate that partitions the housing space and the second volume chamber is provided.

The invention according to claim 2 is the invention according to claim 1,
The accommodation space is extended inside the cover part,
A communication hole that communicates the expanded storage space and the second volume chamber is provided,
The first volume chamber and the second volume chamber communicate with each other.

The invention described in claim 3 is the invention described in claim 2,
The second volume chamber is provided from the upper part of the bearing to both sides thereof along the outer peripheral part of the one bearing.
The communication holes are provided at the bottoms of the both side portions, respectively.

The invention according to claim 4 is the invention according to any one of claims 1 to 3,
The baffle plate is provided with a guide portion for guiding lubricating oil to the one-side bearing.

The invention according to claim 5 is the invention according to any one of claims 2 to 4,
The power transmission mechanism is composed of a pair of helical gears,
The lower gear disposed below the pair of helical gears is configured to scoop up the lubricating oil stored in the case and to be supplied to the upper gear side disposed above,
The inclination direction of the tooth surface of the lower gear is a direction in which the lubricating oil scraped up by the lower gear scatters toward the non-cover portion side.

  First, according to the first aspect of the present invention, when the internal pressure of the accommodation space that accommodates the power transmission mechanism rises due to the rotation of the power transmission mechanism, the lubricating oil in the accommodation space is in the form of air and liquid or In a mixed state in the form of a mist, it flows into a first volume chamber provided in the upper part of the accommodation space and a second volume chamber provided on the cover side. In the first and second volume chambers, the mixed lubricating oil and air can be separated as described above, and only air can be discharged to the outside.

  In particular, in the present invention, in addition to the first volume chamber, the second volume chamber is provided as a breather volume chamber that separates liquid or mist-like lubricating oil flowing from the housing space from air. The volume of the breather volume chamber can be secured without expanding the first volume chamber at the top of the accommodation space. Therefore, the volume of the breather volume chamber can be secured while avoiding an increase in the size of the tunnel space in which the transfer device is arranged.

  For example, when a change rod or the like of a transmission is provided above the transfer device, interference between the change rod and the breather device above the transfer device can be avoided. Further, the accommodation space and the second volume chamber are partitioned by a baffle plate. This prevents the lubricating oil from directly entering the second volume chamber from the accommodation space.

  According to the second aspect of the present invention, a communication hole that communicates the expanded space inside the cover portion with the second volume chamber is provided, and the first volume chamber is provided. Since the second volume chamber communicates with the second volume chamber, the liquid or mist-like lubricating oil and air flowing from the housing space flow into the second volume chamber from the communication hole. And since the said 2nd volume chamber, the 1st volume chamber, and the said breather channel | path are connected, the said liquid or mist-like lubricating oil and air pass through the 1st volume chamber from the said 2nd volume chamber. Alternatively, it flows directly into the breather passage.

  As a result, the liquid or mist-like lubricating oil and air pass through the second volume chamber and the first volume chamber from the housing space to the breather passage. The liquid or mist-like lubricating oil and air can be more reliably separated from each other as compared with a path that passes only through the first or second volume chamber. In the case where the internal pressure in the housing space rises rapidly, the liquid or mist-like lubricating oil and air can flow directly from the second volume chamber to the breather passage, and therefore pass through the first volume chamber. An increase in internal pressure can be suppressed by a shorter path than the case.

  According to a third aspect of the present invention, the second volume chamber is provided so as to extend from the upper part to both sides along the outer peripheral part of the bearing on the one side, and the communication hole is formed on the both sides. Since it is provided at the bottom of each part, it is possible to avoid the communication hole from being closed while increasing the volume of the breather volume chamber.

  For example, when the level of the lubricating oil is inclined when the vehicle is turning, the other communication hole can be kept open even when the oil level of the lubricating oil blocks one side of the communication hole. Therefore, it is possible to avoid an increase in the internal pressure of the accommodation space due to the communication hole being blocked.

  A state where one side of the communication hole is blocked (for example, a state where the liquid level of the lubricating oil is inclined to one side and the one side of the communication hole is blocked when the vehicle turns as described above); Even in the case where the lubricating oil separated in the second volume chamber accumulates at the bottom of the second volume chamber, the other communication hole is not blocked, so that the lubricant is supplied to the other communication hole. Can be removed from.

  By the way, the lubricating oil of the transfer device is stored in the bottom portion of the accommodating space for accommodating the power transmission mechanism, and the lubrication of the power transmission mechanism is disposed below the rotating member constituting the power transmission mechanism. The lubricating oil is picked up and lubricated by the lower rotating member. Moreover, in this scooping-up refueling, it is preferable to supply especially to the bearing of the said power transmission mechanism arrange | positioned upwards.

  Therefore, according to the fourth aspect of the present invention, the baffle plate is provided with a guide portion for guiding the lubricating oil to the bearing on the one side. The lubricating oil splashed to the baffle plate side can be supplied to the bearing of the power transmission mechanism by the guide part of the baffle plate. Thereby, the lubricating oil can be supplied to the bearing of the power transmission mechanism by utilizing the baffle plate that partitions the second volume chamber and the accommodation space.

  According to a fifth aspect of the present invention, the power transmission mechanism includes a pair of helical gears, and the lower gear disposed below the pair of helical gears is stored in the case. The lubricating oil is scraped up and supplied to the upper gear side disposed above, and the inclination direction of the tooth surface of the lower gear is the lubricating oil scooped up by the lower gear. Is in a direction that scatters toward the non-cover portion side, so that the lubricating oil is less likely to scatter to the communication hole side of the second volume chamber formed in the cover portion, thereby suppressing leakage of the lubricating oil. .

It is the schematic which shows the power transmission mechanism of the four-wheel drive vehicle by which the transfer apparatus which concerns on embodiment of this invention is mounted. It is sectional drawing which shows the said transfer apparatus. It is a front view when the cover of the transfer case of the said transfer apparatus shown by the AA arrow in FIG. 2 is removed. FIG. 3 is a rear view of a single cover of the transfer case shown by arrows BB in FIG. 2. It is a rear view of a case cover when the main body of the transfer case of the said transfer apparatus shown by the BB arrow in FIG. 2 is removed. It is CC sectional drawing of FIG. It is DD sectional drawing of FIG. It is the perspective view which showed the relationship between the to-be-driven gear and lubricating oil guide structure of the transfer apparatus which concerns on embodiment of this invention. It is sectional drawing of the said transfer apparatus of the position shown by EE of FIG.

  The details of the vehicle transfer apparatus according to the present invention will be described below.

  As shown in FIG. 1, a vehicle 1 equipped with a transfer device 10 according to an embodiment of the present invention is a four-wheel drive vehicle based on a front engine and a rear drive vehicle, and an engine 2 as a drive source at the front of the vehicle body. And the transmission 3 are arranged so that the shaft center extends in the longitudinal direction of the vehicle body.

  On a rear-wheel output shaft 11 as a drive shaft extending rearward of the transmission 3 on the vehicle body, a driving force output from the transmission 3 includes a rear wheel that is a main drive wheel and a front wheel that is an auxiliary drive wheel. A transfer device 10 for allocating to each other is provided.

  The transfer device 10 is provided with a front wheel output shaft 12 as another drive shaft that is arranged in parallel with the rear wheel output shaft 11 and outputs a driving force to the front wheels. On the rear wheel output shaft 11, there is a coupling 13 and a drive gear that is disposed on the vehicle body front side of the coupling 13 and transmits the driving force taken out from the coupling 13 to the front wheel output shaft 12. 21 and a damper 14 disposed between the coupling 13 and the drive gear 21 for moving a resonance frequency generated in the engine out of the normal range.

  A driven gear 22 that meshes with the driving gear 21 is provided on the front wheel output shaft 12, and the driving force for the front wheels taken out by the coupling 13 is applied to the driving gear 21 and the driven gear. 22 is transmitted to the front-wheel output shaft 12 through 22.

  The drive gear 21 and the driven gear 22 are formed as helical gears and constitute a power transmission mechanism 20.

  The front wheel output shaft 12 is connected via a universal joint 30 to a front wheel propeller shaft 40 extending forward of the vehicle body. The front wheel propeller shaft 40 is connected to an input shaft 61 of a front wheel differential device 60 via a universal joint 50, and the input shaft 61 is connected to axles 62 and 62 respectively connected to left and right front wheels. Yes.

  As a result, the driving force extracted by the coupling 13 is transmitted to the front wheel output shaft 12 via the drive gear 21 and the driven gear 22, and the front wheel propeller shaft is transmitted from the front wheel output shaft 12. 40 and the front wheel differential 60 are transmitted to the front wheels. In the four-wheel drive vehicle 1, the coupling 13 can change the torque distribution between the front wheels and the rear wheels in a range of front wheels: rear wheels = 0: 100 to 50:50. The operation of the coupling 13 is controlled by a control unit (not shown).

  Next, the transfer device 10 according to the embodiment of the present invention will be described in more detail with reference to FIG.

  As shown in FIG. 2, the transfer case 70 of the transfer device 10 is formed by fastening a main body 71 and a cover 72 that covers the transmission 3 side of the main body 71 with a bolt (not shown).

  In the transfer case 70, a rear wheel output shaft 11 connected to the input shaft 3a from the transmission 3 and a front wheel output shaft 12 provided in parallel with the rear wheel output shaft 11 rotate. Supported as possible. Between the main body 71 and the cover 72 of the transfer case 70, an accommodation space Z1 in which the drive gear 21 and the driven gear 22 constituting the power transmission mechanism 20 are accommodated is formed.

  The drive gear 21 of the power transmission mechanism 20 has a hollow shaft shape and is provided on the rear wheel output shaft 11, and the driven gear 22 has a hollow shaft shape and is provided on the front wheel output shaft 12. The drive gear 21 and the driven gear 22 are arranged in mesh with each other.

  The drive gear 21 includes a tooth portion 21a having oblique teeth formed on the outer peripheral surface, and a cylindrical front side cylindrical portion extending integrally from the inner peripheral side of the tooth portion 21a to the vehicle body front side and the vehicle body rear side, respectively. 21b and the rear cylindrical part 21c are provided. The drive gear 21 is rotatably supported by the transfer case 70 via bearings 81 and 82 provided on the outer peripheral side of the front cylindrical portion 21b and the rear cylindrical portion 21c.

  The driven gear 22 includes a tooth portion 22a having oblique teeth formed on the outer peripheral surface, a recess 22b provided on the inner peripheral side of the tooth portion 22a and opened to the front side of the vehicle body, and an inner portion of the tooth portion 22a. A cylindrical portion 22c extending integrally from the circumferential side to the vehicle body rear side is provided. The driven gear 22 is rotatably supported by the transfer case 70 via bearings 83 and 84 provided on the inner peripheral side of the recess 22b and the outer peripheral side of the cylindrical portion 22c.

  The lower part of the housing space Z1 has a function as an oil storage part in which lubricating oil for lubricating the power transmission mechanism 20 is stored so that the lower part of the driven gear 22 is immersed. Yes.

  The front wheel output shaft 12 is spline-fitted and connected to the inner peripheral surface of the cylindrical portion 22c of the driven gear 22. The front wheel output shaft 12 is connected to a front wheel propeller shaft 40 via a universal joint 30, and an outer joint member 31 of the universal joint 30 is integrally formed on the vehicle body front side of the front wheel output shaft 12.

  The universal joint 30 includes an outer joint member 31 formed integrally with the front wheel output shaft 12, an inner joint member 32 coupled to the front wheel propeller shaft 40, and the outer joint member 31 and the inner joint member 32. A ball 33 that is interposed between the outer joint member 31 and the inner joint member 32 and transmits the power between the inner joint member 32 and the inner peripheral surface of the outer joint member 31 and the outer peripheral surface of the inner joint member 32. And a cage 34 that holds the power 33 so that power can be transmitted between the front wheel output shaft 12 and the front wheel propeller shaft 40.

  In the transfer device 10, a plurality of seal members 73, 74, and 75 are disposed in the transfer case 70, and the lubricating oil in the transfer case 70 is prevented from leaking to the outside. Specifically, the transfer case 70 includes a seal member 73 provided between the cover portion 72 of the transfer case 70 and the rear wheel output shaft 11, the cover portion 72 of the transfer case 70, and the cover. A seal member 74 provided on the inner peripheral side of the recess 22 b of the drive gear 22; a power transmission member 14 a extending from the main body 71 of the transfer case 70 and the damper 14 provided on the rear wheel output shaft 11; And a seal member 75 provided therebetween.

  The main body 71 of the transfer case 70 is provided with a coupling storage space Z2 in which the coupling 13 and the damper 14 on the vehicle rear side of the power transmission mechanism 20 are disposed. The main body 71 of the transfer case 70 is provided with a breather device B for suppressing an increase in internal pressure due to rotation of rotating members such as the coupling 13 and the damper 14 in the coupling storage space Z2. (See FIG. 6).

  The breather device B includes a breather valve B1 disposed above the power transmission mechanism 20 of the main body 71 and protruding from a side surface of the main body 71, and the coupling storage space of the main body 71. The first breather passage B21 provided so as to communicate with the upper part of the power transmission mechanism 20 where the breather valve B1 is disposed from Z2, and the first breather passage B21 and the breather valve B1 are communicated with each other. A second breather passage B22 is provided.

  The breather valve B1 will be described with reference to FIG. The cylindrical main body B11 of the breather valve B1 has a communication passage B12 communicating with the second breather passage B22 inside, and one end side of the main body B11 is press-fitted into the second breather passage B22, for example. Screwed. The breather valve B1 includes a main body B11 attached to the second breather passage B22, a valve body B13 disposed so as to close the communication path B12 on the other end side of the main body B11, and the valve body B13. A spring B14 disposed above and a cap B15 disposed so as to cover the spring B14 and restricting the bias of the spring B14 are provided. The cap B15 is press-fitted into the main body B11, and has an air vent hole B16 on its upper surface.

  In the breather valve B1 configured in this way, when the internal pressure of the coupling storage space Z2 rises, the air in the first and second breather passages B21 and B22 pushes up the valve body B13, and the upper end of the main body B11. The internal pressure of the coupling storage space Z2 is reduced by passing through the gap between the main body B11 and the cap B15 from the gap between the valve body B13 and the valve body B13 and through the hole B16 of the cap B15. It has come to be adjusted. In place of the air vent hole B16 provided on the upper surface of the cap B15, a gap is provided between the outer peripheral portion of the main body B11 and the inner peripheral portion of the cap B15 corresponding thereto, and the air is passed through the gap. You may make it pull out.

  Thus, the coupling storage space Z2 is communicated with the outside through the first breather passage B21, the second breather passage B22, and the breather valve B1.

  The breather device B also has a function of suppressing an increase in internal pressure of the accommodation space Z1 due to rotation of the power transmission mechanism 20 in the accommodation space Z1.

  Here, a configuration for suppressing an increase in internal pressure of the accommodation space Z1 of the breather apparatus B will be described in detail with reference to FIGS. Note that lubricating oil is stored in the accommodation space Z1, and as the internal pressure of the accommodation space Z1 increases, a part of the lubricating oil in the accommodation space Z1 is mixed with air and liquid or mist. It will be in a consistent state.

  Therefore, as shown in FIG. 2, the breather device B includes the breather valve B1, the third breather passage B23 that connects the breather valve B1 and the housing space Z1, and the liquid or mist shape described above. Breather volume chambers B3, B3, B4 for separating the lubricating oil and air are provided. Of the breather volume chambers B3, B3, B4, the main body portion 71 is provided with first volume chambers B3, B3, and the cover portion 72 is provided with a second volume chamber B4.

  First, the 3rd breather channel | path B23 is demonstrated using FIG. 2 and FIG. As shown in FIG. 2, the third breather passage B <b> 23 extends above the accommodation space Z <b> 1 of the main body 71 of the transfer case 70 from the cover portion 72 side toward the coupling accommodation space Z <b> 2 side. Is formed. Further, as shown in FIG. 3, the end portion of the third breather passage B23 on the cover portion 72 side is provided with an opening B23 ′ on the cover portion 72 side, and the coupling storage space Z2 side is , Communicated with the first breather passage B21.

  Next, the first volume chambers B3 and B3 will be described with reference to FIG. As shown in the figure, the openings B31, B31 of the first volume chambers B3, B3 are located above the accommodation space Z1 of the power transmission mechanism 20 of the main body 71 and in the transmission of the third breather passage B23. It is provided on both sides of the opening B23 ′ on the 3 side. The first volume chambers B3 and B3 are formed by boss portions 71a and 71a provided in parallel to the third breather passage B23 (see FIG. 6).

  The second volume chamber B4 will be described with reference to FIG. The second volume chamber B4 is provided along the press-fit portion 72a of the bearing 81 of the drive gear 21 in the cover portion 72 so as to be recessed toward the transmission 3 from the upper portion of the bearing 63 to both sides thereof. It is formed by the recessed part 72b made. And the groove part 72c, 72c opened to the said main-body part 71 side is provided in the bottom part of the both sides of this 2nd volume chamber B4.

  Further, as shown in FIG. 5, the second volume chamber B <b> 4 is covered with a baffle plate 91 formed along the outer peripheral portion of the bearing 63 from the upper portion of the bearing 63 to both sides thereof. At the top of the baffle plate 91, there is provided a guide portion 91a that guides the above-mentioned liquid or mist-like lubricating oil and air from the housing space Z1 to the third breather passage B23. The guide portion 91a protrudes from the top of the baffle plate 91 and is formed in an inverted U shape that opens to the main body 71 side in plan view (see FIG. 6).

  A seal portion 91 b is provided along the shape of the outer peripheral side of the baffle plate 91. The baffle plate 91 is attached to the press-fit portion 72a by a plurality of tapping screws 91c ... 91c.

  As shown in FIG. 5, the housing space Z1 and the second volume chamber B4 are partitioned by fixing the baffle plate 91 to the cover portion 72. The seal portion 91b of the baffle plate 91 is in contact with a groove portion 71b provided at a position corresponding to the seal portion 91b below the first volume chambers B1 and B1 of the main body portion 71 of the transfer case 70. (See FIGS. 3 and 7).

  In addition, communication holes B41 and B41 are formed when the baffle plate 91 closes open portions of the cover portions 72 on the main body portion 71 side of the groove portions 72c and 72c. The accommodation space Z1 and the second volume chamber B4 are in communication with each other through the communication holes B41 and B41.

  Further, as shown by phantom lines in FIG. 4, wall portions 91 d and 91 d extending toward the cover portion 72 side of the baffle plate 91 are provided on the lower side of the both side portions of the baffle plate 91 and the surface on the cover portion 72 side. Each is provided. The wall portions 91d and 91d are disposed at positions that cover both the communication holes B41 and B41 from below. As shown in the XX cross-sectional enlarged view of FIG. 4, the walls 91d and 91d are provided so as to overlap the holes B41 and B41 in the vertical direction of the vehicle body. The lubricating oil scraped up by the driven gear 22 is prevented from flowing directly into the second volume chamber B4.

  The relationship between the first and second volume chambers B3, B3, B4 and the first, second, and third breather passages B21, B22, B23 will be described with reference to FIGS.

  The main body portion 71 and the cover portion 72 to which the baffle plate 91 is attached are fixed by a plurality of bolts 76... 76 so that the mating surface of the main body portion 71 and the mating surface of the cover portion 72 are paired. Touched. At this time, in the upper part of the transfer case 70, the first volume chambers B3, B3 above the main body 71 and the second volume chamber B4 above the cover 72 are in communication.

  Further, a guide space a1 having a U-shaped cross section in a plan view of the guide portion 91a of the baffle plate 91 covers the opening B23 'on the cover portion 72 side of the third breather passage B23, while the first space. It arrange | positions so that a part on the 3rd breather channel | path B23 side of opening part B31, B31 of volume chamber B3, B3 may be straddled. Thus, gaps a2 and a2 are formed between the side walls B32 and B32 of the first volume chambers B3 and B3 on the third breather passage side and the guide portion 91a. Thereby, the first volume chambers B3 and B3 communicate with the guide space a1.

  Since the third breather passage B23 communicates with the first and second breather passages B21 and B22, the third breather passage B23 and the breather valve B1 communicate with each other.

  And as shown in FIG. 7, the clearance gap a3 is provided between the upper end of the said guide part 91a, the said main-body part 71, and the said cover part 72, Thereby, said 2nd volume chamber B4 is provided. The guide space a1 communicates with the gap a3.

  Next, the operation of the breather device B of the vehicle transfer device 10 according to the present embodiment will be described.

  In the breather device B on the side of the coupling storage space Z2 of the transfer device 10 to which the breather device B is applied, as shown by the arrow f1 in FIG. 7, the coupling storage space Z2 is the first breather passage B21. And through the second breather passage B22 to the breather valve B1.

  Thereby, when the internal pressure in the coupling storage space Z2 rises, the breather valve B1 is opened by the internal pressure, and air is released to the outside. As a result, an increase in the internal pressure of the coupling storage space Z2 is suppressed.

  On the other hand, in the breather device B on the side of the accommodation space Z1 of the transfer device 10 to which the breather device B is applied, as shown by the arrow f2 in FIG. 6, the accommodation space Z1 is a communication hole of the second volume chamber B4. B41, B41, the second volume chamber B4, the first volume chambers B3, B3, the gaps a2, a2 between the first volume chambers B3, B3 and the guide portion 91a of the baffle plate 91, and the guide It communicates with the breather valve B1 through the space a1, the third breather passage B23, and the second breather passage B22.

  Further, as indicated by an arrow f3 in FIG. 7, the accommodation space Z1 includes the communication holes B41 and B41 of the second volume chamber B4, the second volume chamber B4, the upper end of the guide portion 91a, and the cover portion. 72 to the breather valve B1 through the gap a3, the guide space a1, the third breather passage B23, and the second breather passage B22.

  Thereby, when the internal pressure in the accommodation space Z1 rises due to an increase in the lubricating oil temperature or the like, the breather valve B1 is opened by the internal pressure, and air is released to the outside. As a result, an increase in the internal pressure of the accommodation space Z1 is suppressed, and leakage of lubricating oil from the seal member is prevented.

  Further, in the first and second volume chambers B3, B3, and B4, the liquid or mist-like lubricating oil mixed with air can be separated as described above so that only the air can be discharged to the outside. It has become.

  Further, in addition to the first volume chambers B3 and B3 in the upper part of the storage space Z1, the cover portion 72 has a second as a breather volume chamber that separates liquid or mist-like lubricating oil flowing from the storage space Z1 from air. Since the volume chamber B4 is provided, the volume of the breather volume chamber can be secured without expanding the first volume chambers B3 and B3. Therefore, the volume of the breather volume chamber can be ensured while avoiding an increase in the size of the tunnel space in which the transfer device 10 is disposed.

  For example, as shown by the phantom line in FIG. 2, the first volume chamber is provided even when a change rod 9 for changing the gear position of the transmission 3 is disposed above the transfer case 70. Interference between B3 and B3 and the change rod 9 can be avoided.

  Since it passes through the second volume chamber B4 and the first volume chambers B3 and B3 from the housing space Z1 to the breather passage B23, the liquid or mist-like lubricating oil is more reliably supplied. And air can be separated.

  The second volume chamber B4 is provided so as to extend from the top to both sides along the outer periphery of the bearing 81 of the drive gear 21, and the communication holes B41 and B41 are provided at the bottoms of the both sides. Therefore, the communication holes B41 and B41 can be prevented from being blocked while the volume of the second volume chamber B4 is increased.

  For example, when the level of the lubricating oil is inclined when the vehicle is turning, the communication hole B41 on the other side remains open even when the oil level of the lubricating oil blocks one side of the communication holes B41 and B41. Therefore, an increase in the internal pressure of the accommodation space Z1 due to the communication hole B41 being blocked can be avoided.

  Further, when the vehicle turns as described above, the lubricating oil level is inclined to one side, one side of the communication holes B41 and B41 is closed, and the lubrication separated in the second volume chamber B4 Even in the case where oil accumulates at the bottom of the second volume chamber B4, the other communication hole B41 is not blocked, so that the lubricating oil can be extracted from the other communication hole B41.

  By the way, as shown in FIG. 8, the lubrication of the vehicle transfer device 10 according to the present embodiment is performed by scattering and scattering the lubricating oil stored in the accommodation space Z <b> 1 by the tooth surface of the driven gear 22. Thus, it is supplied to the drive gear 21 side. In the present embodiment, the helical gear tooth surface 22a 'of the driven gear 22 is formed such that the side portion 22e on the front side in the rotational direction R1 is on the front side of the vehicle body.

  The lubricating oil on the tooth surface 22a ′ of the driven gear 22 tends to flow in the direction of the arrow R2 along the inclination of the tooth surface 22a ′ of the driven gear 22 in a static state. Is rotating in the direction of the arrow R1, the lubricating oil is likely to be scattered on the rear side of the vehicle body and is less scattered on the front side of the vehicle body.

  That is, the second volume chamber B4 of the breather device B is disposed on the vehicle body front side with less scattering of the lubricating oil with respect to the housing space Z1, so that the lubricating oil to the second volume chamber B4 can be reduced. Intrusion can be prevented.

  Further, while the meshing portion of the power transmission mechanism 20 is lubricated by the above-described scoop-up lubrication, the bearings 81, 82, 83, and 84 that support the power transmission mechanism 20 are arranged particularly on the upper side. It is necessary to supply lubricating oil to the bearings 81 and 82 of the drive gear 21 that are provided. The transfer device 10 of the vehicle 1 in the present embodiment has a function for supplying lubricating oil to the bearings 81 and 82 of the drive gear 21.

  The operation of the lubricating oil guide structure of the transfer device 10 will be described with reference to FIGS. 8 and 9.

  In the present embodiment, as described above, the lubricating oil is likely to be scattered to the rear side of the vehicle body depending on the inclination direction of the tooth surface 22a 'of the helical gear of the driven gear 22.

  On the other hand, the lubricating oil is less likely to scatter to the side portion 22e (the vehicle body front side) which is the front side in the rotation direction R1 of the tooth surface 22a ′ of the driven gear 22, The driven gear 22 is removed from the housing space Z1 by an oil path 92 that is arranged behind the meshing portion Y with the driving gear 21 in the rotational direction R1 and close to the outer peripheral surface of the driven gear 22. The scraped lubricating oil is disposed along the inclination of the oil path 92 at the side portion 22e (vehicle body front side) where the tooth surface 22a 'of the driven gear 22 is on the front side in the rotational direction R1. This is supplied to the bearing 81 of the drive gear 21.

  Specifically, the oil path 92 is provided with a ceiling portion 92a along the outer periphery of the driven gear 22 and a vertical wall portion 92b extending downward from an end portion of the ceiling portion 92a on the meshing portion Y side. The vertical wall portion 92b is inclined in the same direction as the inclination of the tooth surface 22a ′. As a result, as shown in FIG. 9, the lubricating oil scraped up by the driven gear 22 is guided to the front side of the vehicle body along the inclination of the ceiling portion 92a and the vertical wall portion 92b of the oil path 92. .

  The lubricating oil guided by the oil path 92 flows into the basic surface portion 91e of the baffle plate 91 provided at a position corresponding to the point where the lubricating oil is guided, and further, the drive gear of the basic surface portion 91e. Guided to a hole 91f provided in the lower part on the 21st side. The lower end portion of the basic surface portion 91e has an inclined portion 91g as a guide portion extending from the hole 91f to the counter drive gear 21 side, and the hole 91f from the end portion of the inclined portion 91g on the drive gear 21 side. A rising portion 91h that rises so as to surround is provided (see FIG. 5). Thereby, the lubricating oil is guided to the groove portion 72d of the cover portion 72 provided at a position corresponding to the hole 91f of the baffle plate 91 (see FIG. 4).

  Furthermore, as shown in FIG. 9, the lubricating oil includes a gap S <b> 1 provided between the groove portion 72 d of the cover portion 72 and the bearing 81, a groove portion 72 d of the cover portion 72, and the front side of the vehicle body of the bearing 81. Provided between the seal member 73 of the cover portion 72 and the plate member 85, and a gap S2 provided between the plate member 85 and the plate member 85 extending to the outer peripheral side of the rear wheel output shaft 11. It passes through the guide passage S formed by the gap S3.

  The lubricating oil includes a gap S4 provided between the inner peripheral end of the plate member 85 and the rear wheel output shaft 11, the rear surface of the plate member 85, and the bearing. 81 and a bearing 81 on the front side of the vehicle body of the drive gear 21 through a gap S5 provided between the drive gear 21 and the front side cylindrical portion 21b of the drive gear 21.

  A part of the lubricating oil guided to the rear wheel output shaft 11 side is provided between the inner peripheral side of the front cylindrical portion 21 b of the drive gear 21 and the rear wheel output shaft 11. Through the gap S6, the needle bearing 86 disposed between the inner peripheral side of the drive gear 21 and the rear wheel output shaft 11 is lubricated.

  Further, a part of the lubricating oil includes a spline portion 21d on the inner peripheral side of the rear cylindrical portion 21c of the drive gear 21 and a cylinder as another member for transmitting a driving force from the damper 14 to the drive gear 21. Is also supplied to the spline fitting with the spline part 14b of the power transmission member 14a, and then passes through the bearing 82 on the rear side of the vehicle body of the drive gear 21 and is recovered to an oil storage part (not shown).

  Lubricating oil is applied to the bearings 81, 82, 86 and the spline portion 14b (21d) of the power transmission mechanism 20 by utilizing a baffle plate 91 that partitions the second volume chamber B4 of the breather device B and the housing space Z1. Can be supplied.

  INDUSTRIAL APPLICABILITY The present invention can be suitably used in a vehicle transfer device that is disposed inside a tunnel and includes a breather device.

1 Vehicle 10 Transfer Device 11 Rear Wheel Output Shaft (Drive Shaft)
12 Front wheel output shaft (other drive shaft)
20 Power transmission mechanism 21 Drive gear (upper gear)
21 Drive gear (upper gear)
70 Transfer case (case)
71 Body portion 72 Cover portion 81 Bearing 91 on one side of drive shaft Baffle plate 91g Inclined portion (guide portion)
B breather devices B21, B22, B23 first, second and third breather passages (breather passages)
B3, B3 first volume chamber B4 second volume chamber B41, B41 communication hole Z1 accommodation space

Claims (5)

A power transmission mechanism that transmits power between a drive shaft that transmits power to one of the front and rear drive wheels and another drive shaft that is arranged in parallel to the drive shaft;
A case for storing the power transmission mechanism and storing lubricating oil at the bottom thereof;
A breather device provided in the case;
The case has a main body having an accommodating space for accommodating the power transmission mechanism at one end in the axial direction;
A vehicle transfer device comprising a cover portion that closes an open portion of the main body portion on the accommodation space side,
A bearing on one side of the upper drive shaft among the drive shafts is provided in the cover portion,
The breather device includes a first volume chamber provided in an upper portion of the housing space of the main body,
A second volume chamber provided above the bearing;
Breather passages respectively leading to the first volume chamber and the second volume chamber;
A transfer device for a vehicle, comprising a baffle plate that partitions the housing space and the second volume chamber. The accommodation space is extended inside the cover part,
A communication hole that communicates the expanded storage space and the second volume chamber is provided,
The vehicle transfer device according to claim 1, wherein the first volume chamber and the second volume chamber communicate with each other. The second volume chamber is provided from the upper part of the bearing to both sides thereof along the outer peripheral part of the one bearing.
The vehicle transfer device according to claim 2, wherein the communication hole is provided in a bottom portion of each of the both side portions.   The vehicle transfer device according to any one of claims 1 to 3, wherein the baffle plate is provided with a guide portion that guides the lubricating oil to the one-side bearing. The power transmission mechanism is composed of a pair of helical gears,
The lower gear disposed below the pair of helical gears is configured to scoop up the lubricating oil stored in the case and to be supplied to the upper gear side disposed above,
5. The tilting direction of the tooth surface of the lower gear is a direction in which the lubricating oil scraped up by the lower gear scatters to the side opposite to the cover portion. 6. A vehicle transfer device according to claim 1.

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