JP2008185154A - Breather structure for final reduction gear - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a breather structure for a final reduction gear, having simpler construction for accurately preventing the entry or residence of lubricating oil into a breather chamber following the forward or reverse travel of a vehicle. <P>SOLUTION: The final reduction gear 1 stores a gear group for giving differential rotation as well as rotating drive to a driving wheel with a power-transmitted pinion gear 8 engaging with a differential device (a ring gear) 7a. It has a gear camber 6 for reserving lubricating oil OIL to lubricate the gear group. The breather structure releases pressure in the gear chamber 6 to the air through the breather chamber 4 provided in the upper part of the gear chamber 6. Particularly, it has a movable closing mechanism using a partition plate 9 which is turned in accordance with the energizing force of the lubricating oil OIL splashed up with the rotation of gears constituting the differential device, for dynamically closing a vent hole opposite to the splashing direction of the lubricating oil OIL, out of vent holes 13a, 13b ranging from the gear chamber 6 to the breather chamber 4. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a breather structure of a final reduction device that is a communication structure between a breather chamber and a gear chamber in a final reduction device (differential gear device) mounted on a vehicle such as an automobile.

  As is well known, in vehicles such as automobiles, as a part of a power transmission system that transmits engine output to driving wheels, the power from the transmission is differentially transmitted via a pinion gear and a differential device (differential). A final reduction gear device (differential gear device) is mounted which transmits to the drive wheels while allowing rotation. Usually, lubricating oil is stored in the inner bottom portion of the carrier that is the carrier of the final reduction gear, and the pinion gear (drive pinion gear) accommodated in the gear chamber of the final reduction gear is stored by the stored lubricating oil. Thus, the lubrication of the differential gear including the ring gear meshed with the pinion gear is maintained. Further, in such a final speed reducing device, in order to suppress the change in internal pressure due to the expansion and contraction of the lubricating oil and the internal air accompanying the temperature change inside the carrier, the upper part of the carrier, that is, the above-mentioned A breather chamber is also provided in the upper part of the gear chamber, and the internal pressure of the carrier (gear chamber) is regulated through the breather chamber so as to be substantially equal to the atmospheric pressure.

  By the way, with such a structure as a final reduction gear, while the vehicle is running, the stored lubricating oil is splashed upward and scattered as the gears rotate, and the scattered lubricating oil May enter the breather chamber. And when the lubricating oil may enter the breather chamber in this way, the intruded lubricating oil flows out to the outside through a breather plug provided as a communication portion with the atmosphere at the upper part of the breather chamber, or This lubricating oil adheres to the breather plug and closes the communication hole with the atmosphere, resulting in inconveniences such as disabling the breather function.

  Therefore, conventionally, as in the breather structure described in Patent Document 1, for example, a structure in which a partition member for preventing the scattered lubricating oil from entering the breather chamber is provided between the gear chamber and the breather chamber. Has also been proposed. 5 and 6 show an outline of the breather structure described in Patent Document 1. FIG. FIG. 5 is an enlarged view of the breather chamber of the final reduction gear and the structure in the vicinity thereof, and FIG. 6 shows a perspective structure of the partition member provided corresponding to the breather chamber. It is a thing.

That is, first, as shown in FIG. 5, in the final reduction gear 50, the breather chamber 48 is defined on the upper portion of the gear chamber 46 via the rib 49, and the communication hole 41 formed in the rib 49 is used. When the gear chamber 46 communicates with the breather chamber 48, a partition member 44 is provided on the rib 49, and the front and rear sides of the communication hole 41 are partitioned through the partition member 44. 6, the partition member 44 includes a first partition plate 44a that partitions the rear of the communication hole 41, a second partition plate 44b that partitions the front of the communication hole 41, and a gear chamber 46. A third partition plate 44c that partitions the inner ring gear (not shown) and the communication hole 41 is provided, and is attached to the rib 49 through an attachment portion 44d. By providing such a partition member 44, the lubricating oil repelled by the ring gear when the vehicle travels in a forward direction (in a direction orthogonal to the back of FIG. 5) is blocked by the first partition plate 44a, and the vehicle moves backward. Lubricating oil repelled by the ring gear during traveling (in a direction orthogonal to the front of FIG. 5) is blocked by the second partition plate 44b to prevent the lubricating oil from entering the communication hole 41. Similarly, the lubricating oil splashed laterally from the ring gear is blocked by the third partition plate 44c of the partition member 44, and the lubricating oil is prevented from entering the communication hole 41. In FIG. 5, reference numeral 45 indicates the breather plug (breather pipe) provided to communicate the breather chamber 48 with the atmosphere.
JP 2002-181169 A Japanese Utility Model Publication No. 01-115083

Thus, by providing the partition member between the gear chamber and the breather chamber constituting the final reduction gear, the lubricating oil is repelled upward as the gears rotate while the vehicle is traveling. Even in the case of scattering, the intrusion of the scattered lubricating oil into the breather chamber is surely suppressed. However, in the breather structure described in Patent Document 1, in order to reliably prevent the lubricating oil scattered from four sides from entering the breather chamber through the partition member, gaps between the partition plates constituting the partition member are provided. It is necessary to set as narrow as possible. However, if the gap between the partition plates is set so narrow,
・ Lubricated oil that has entered through this gap is difficult to escape.
-Since the gap is narrow, an oil film is easily formed in the gap.
A new inconvenience that may lead to a decrease in the breather function is caused, and there are still problems in practical use.

  Conventionally, as seen in Patent Document 2, for example, a breather structure has been proposed in which a large number of oil drain holes for draining intruding lubricating oil have been provided, but the structural complexity cannot be avoided. In practice, there is still room for improvement.

  The present invention has been made in view of such circumstances, and its purpose is to more accurately prevent the intrusion and retention of lubricating oil in the breather chamber when the vehicle moves forward or backward while having a simpler structure. An object of the present invention is to provide a breather structure for a final reduction gear that can be used.

Hereinafter, means for solving the above-described problems and the effects thereof will be described.
According to the first aspect of the present invention, a gear group that rotationally drives the drive wheels while accommodating differential rotation of the drive wheels by meshing the pinion gear to which power is transmitted and the differential device is housed, and the gear groups. In a breather structure of a final reduction device that includes a gear chamber in which lubricating oil for lubricating the oil is stored and that releases the internal pressure of the gear chamber to the atmosphere through a breather chamber provided in the upper portion of the gear chamber, the gear constituting the differential device A vent hole that has a partition plate that rotates based on the urging force of the lubricating oil repelled with the rotation of the air hole and that faces the scattering direction of the lubricating oil among the vent holes from the gear chamber to the breather chamber. The gist is that a movable closing mechanism for dynamically closing is provided.

  In such a final reduction gear, normally, as the gear group rotates, the lubricating oil scatters in all directions in the gear chamber, but as long as the traveling direction of the vehicle is selected in either the forward or reverse direction, for example, The lubricating oil does not splash in all directions at the same time in the gear chamber. That is, according to the traveling direction of the vehicle, the splashing direction of the lubricating oil to be repelled tends to be regulated in a substantially constant direction corresponding to the traveling direction. For this reason, even when there are a plurality of vent holes from the gear chamber to the breather chamber, for example, it is not necessary to close the plurality of vent holes at the same time. On the contrary, if the plurality of vent holes are closed at the same time, the breather function itself through the breather chamber itself is hindered. In this regard, according to the structure as the breather structure of the final reduction gear, only the air holes that face the lubricating oil scattering direction among the plurality of air holes through the rotation of the partition plate constituting the movable closing mechanism. However, since only the air holes facing the occasional splashing direction of the lubricating oil are selectively closed, the intrusion of the lubricating oil into the breather chamber when the vehicle advances or reversely travels, It will be stopped accurately with a high degree of freedom. And in this case, since the other air holes other than the air holes to be closed are not closed, the breather function is maintained high, and even if the lubricating oil may enter the breather chamber, The lubricating oil is circulated to the gear chamber through the non-blocked vent holes. That is, the stagnation of the lubricating oil in the breather chamber can be accurately prevented. In addition, the partition plate has a very simple structure that rotates using the urging force of the lubricating oil repelled with the rotation of the gear, and can be easily realized.

  According to a second aspect of the present invention, in the breather structure according to the first aspect, the breather chamber protrudes from the upper portion of the gear chamber to the inward side with respect to the upper portion of the gear chamber, and the end of the breather chamber. The movable closing mechanism is formed with a chamber extending in the front-rear direction of the vehicle in a state of being sandwiched by partitions provided separately in the width direction of the vehicle on which the speed reduction device is mounted. The partition plate is provided in such a manner that a room extending in the vehicle front-rear direction is covered from the gear chamber side and a center portion in the vehicle front-rear direction is pivotally supported by the partition wall. A vent hole extending from the gear chamber to the breather chamber is formed by a gap between each end portion positioned in the vehicle front-rear direction and each facing portion of the breather chamber extending in the vehicle front-rear direction. Form a breather chamber The each end of the vehicle longitudinal direction of the room and gist that the corresponding end of the partition plate and the rotation is formed by a stepped stopper that abuts is provided.

Although a vehicle such as an automobile may turn left and right, its traveling direction is limited to either a forward direction or a backward direction. That is, in the above-described final reduction gear, the splashing direction of the lubricating oil that is repelled with the rotation of the gears constituting the differential gear is limited to either the front or the rear of the vehicle in the gear chamber. It is done. For this reason, the partition plate which comprises the said movable closing mechanism also rotates corresponding to the front-back direction of a vehicle, and the vent hole provided corresponding to the same partition plate is also provided in two places corresponding to the front-back direction of a vehicle. It is necessary and sufficient. And, according to the same structure as the breather structure of the final reduction gear, the vent hole that is closed through the contact of the partition plate with the stopper in the form corresponding to the actual situation of the vehicle is provided. Accordingly, the operational effect of the invention according to claim 1 described above can be realized accurately and with high reliability.

  According to a third aspect of the present invention, in the breather structure according to the second aspect, the partition plate constituting the movable closing mechanism has a surface facing the gear chamber from both end portions located in the vehicle longitudinal direction. It is formed with a curvature surface protruding with a curvature toward the center in the same direction, and a support shaft that is supported by the partition wall is provided at a portion protruding with the curvature surface. And

  In particular, in the breather structure according to the second aspect, the urging force of the lubricating oil in the vehicle front-rear direction repelled with the rotation of the gear is more smoothly applied to the partition plate constituting the movable closing mechanism. Moreover, although it is desired to work efficiently, according to the structure of the partition plate as the invention, it is possible to more accurately meet such a demand.

  Moreover, in this case, even if the lubricating oil may enter the breather chamber by forming the surface of the partition plate facing the breather chamber in a flat plate shape as in the invention described in claim 4. The lubricating oil can be smoothly circulated to the gear chamber through the other non-occluded, rather positively opened vent hole, and the flat upper surface of the inclined partition plate. Become.

  On the other hand, the invention according to claim 5 is the breather structure according to claim 2, wherein the partition plate constituting the movable closing mechanism is T-shaped when viewed from the partition wall side supporting the partition plate. The gist of the present invention is that a support shaft that is pivotally supported by the partition wall is provided at a position corresponding to the center of the T-shaped vertical side or in the vicinity thereof.

  Even with such a structure as the partition plate, the urging force of the lubricating oil in the vehicle front-rear direction which is repelled with the rotation of the gear can be made smoother and more efficiently the same as in the invention of the third aspect. It becomes possible to act on the partition plate.

  In this case, particularly, according to the invention described in claim 6, the front shape of the partition plate formed in a T shape when viewed from the partition wall side when viewed from the vehicle longitudinal direction of the portion corresponding to the vertical side is When the surface area of the upper part with respect to the position of the support shaft pivotally supported by the partition wall is defined as S1, and the surface area of the lower portion with respect to the position of the support shaft supported by the partition wall is defined as S2, "S1> By setting to a shape of “> S2”, the rotation support effect for the partition plate using the urging force of the lubricating oil is further promoted.

(First embodiment)
1 and 2 show a first embodiment of a breather structure of a final reduction gear device according to the present invention. Here, FIG. 1 shows the final reduction gear of the present embodiment and the partial cross-sectional structure of the breather structure as seen from the front direction (vehicle traveling direction), and FIG. 2 shows the final reduction gear. The internal structure of the breather structure viewed from the side (axle side) is schematically shown. FIG. 1 corresponds to a cross-sectional view taken along the line AA in FIG.

  First, as shown in FIG. 1, the final reduction gear 1 to which the breather structure of the present embodiment is applied includes a pinion gear (power transmission from a vehicle transmission or the like) inside a carrier 2 as a carrier. There is provided a differential device 7 composed of a gear group that rotationally drives the axle 17 while enabling differential rotation of the drive wheel meshed with the drive pinion gear) 8 and coupled to the axle 17. The differential device 7 is housed in the gear chamber 6 of the final reduction gear 1 together with the pinion gear 8, and the ring gear 7 a constituting the gear group of the differential device 7 is contained in the gear chamber 6. The pinion gear 8 is meshed with the pinion gear 8. In the gear chamber 6, for example, lubricating oil OIL is stored in the manner shown in FIG. 1, and the gear group including the pinion gear 8 and the ring gear 7a is stored by the stored lubricating oil OIL. The lubrication is maintained.

  On the other hand, in the final reduction gear 1, a breather chamber 4 is provided above the gear chamber 6 so as to project from the upper portion of the gear chamber 6 to the inside of the carrier 2. The breather chamber 4 is formed having a room extending in the front-rear direction of the vehicle in such a manner that the breather chamber 4 is sandwiched between partition walls 11a and 11b that are spaced apart in the width direction of the vehicle on which the final reduction gear 1 is mounted. Has been. A breather plug 5 having a communication hole 5a for communicating the breather chamber 4 with the atmosphere is mounted on the ceiling of the room in a manner that penetrates the carrier 2. The breather chamber 4 extends in the front-rear direction of the vehicle so as to cover the room from the gear chamber 6 side, and the center of the vehicle in the front-rear direction has a shaft 10 with respect to the partition walls 11a and 11b. A partition plate 9 that is pivotally supported by the shaft is provided, and a movable closing mechanism that dynamically closes a vent hole from the gear chamber 6 to the breather chamber 4 is configured by the partition plate 9.

  Here, the structure and function of the movable closing mechanism will be described in more detail with reference to FIG. 2, for the sake of convenience, gear groups other than the ring gear 7a constituting the differential device 7 shown in FIG. 1, the axle 17 of the drive wheel, and the partition walls 11a and 11b that define the breather chamber 4 are shown. Is omitted.

  As described above, FIG. 1 corresponds to a sectional view taken along the line AA in FIG. 2, and the partition plate 9 constituting this movable closing mechanism is lubricated as shown in FIG. Between the gear chamber 6 in which the oil OIL is stored and the breather chamber 4, the chamber forming the breather chamber 4 is covered from the gear chamber 6 side, and is pivotable in the longitudinal direction of the vehicle. It is supported by. And in the breather structure concerning this Embodiment, by the clearance gap between each edge part located in the vehicle front-back direction of the said partition plate 9, and each opposing part of the room of the said breather room 4 extended in the vehicle front-back direction. Vent holes 13a and 13b extending from the gear chamber 6 to the breather chamber 4 are formed. That is, the internal pressure of the gear chamber 6 is released to the atmosphere through the vent holes 13 a and 13 b and the breather plug 5.

  Further, in the breather structure according to the present embodiment, a stepped shape in which the corresponding end portion of the rotated partition plate 9 is brought into contact with each end portion in the vehicle longitudinal direction of the room forming the breather chamber 4. Stoppers 12a and 12b are provided. Thus, when the final reduction gear 1 described below is driven, that is, when the vehicle is running, the end of the vent holes 13a and 13b is brought into contact with the stoppers 12a or 12b by the rotation of the partition plate 9. The other side is dynamically and selectively closed. On the other hand, on the side where the end portion of the partition plate 9 is separated from the stoppers 12a or 12b, there is a larger gap as the vent hole 13a or 13b that ensures ventilation from the gear chamber 6 to the breather chamber 4. Will be secured.

  Incidentally, in such a final reduction gear 1, normally, the lubricating oil OIL scatters in four directions in the gear chamber 6 as the gear group rotates, but the traveling direction of the vehicle is selected to be either forward or reverse. As long as this is done, the lubricating oil OIL does not scatter in all directions in the gear chamber 6 at the same time. That is, the splash direction of the lubricating oil OIL repelled according to the traveling direction of the vehicle tends to be defined in a substantially constant direction corresponding to the traveling direction. The arrows 14a and 14b pointed in FIG. 2 indicate the scattering direction of the lubricating oil OIL repelled in this way, and are shown in the direction indicated by the arrow 14a when the vehicle moves forward, and by the broken arrow 14b when the vehicle moves backward. The lubricating oil OIL is scattered in the directions indicated by. The partition plate 9 constituting the movable closing mechanism is thus repelled and rotated around the shaft 10 based on the urging force of the scattered lubricating oil OIL, and further to one of the stoppers 12a or 12b. The surface that is in contact with the gear chamber 6 and that faces the gear chamber 6 also has a shape that is susceptible to urging (rotational moment) by the lubricating oil OIL. That is, as shown in FIG. 2, the partition plate 9 has a curvature surface in which the surface facing the gear chamber 6 protrudes with curvature from both end portions located in the vehicle front-rear direction to the center portion in the same direction. The shaft 10 serving as a support shaft is provided at a portion protruding with the curvature surface. Moreover, the surface of the partition plate 9 facing the breather chamber 4 is formed in a flat plate shape, and even if the lubricating oil OIL may enter the breather chamber 4, the other is not blocked. Rather, smooth circulation of the lubricating oil OIL to the gear chamber 6 is enabled through the positively opened vent holes and the flat upper surface of the inclined partition plate 9.

  3 (a) and 3 (b) show an example of the operation of the region 3 surrounded by the one-dot chain line in FIG. 2, that is, mainly the portion constituting the movable closing mechanism. The operation of the movable closing mechanism will be described in detail with reference to FIGS.

  In the final reduction gear 1, the lubricating oil OIL stored in the gear chamber 6 is usually indicated by an arrow 14 a when the vehicle is moving forward, that is, mainly due to the rotation of the ring gear 7 a. Or in the direction indicated by the broken arrow 14b when the vehicle is moving forward. When the vehicle is running, the partition plate 9 constituting the movable closing mechanism is also always tilted in any direction by the repelling and scattering of the lubricating oil OIL, that is, the shaft 10 rotates around the shaft 10. Thus, it is maintained in contact with either of the stoppers 12a and 12b.

  Therefore, now assuming that the vehicle starts to travel forward from a stopped state, in the final reduction gear 1, the lubricating oil OIL repels and scatters in the direction indicated by the arrow 14a in FIG. Due to the urging force, a counterclockwise rotational moment as indicated by an arrow in FIG. 3A is generated in the partition plate 9 constituting the movable closing mechanism. As a result, the partition plate 9 immediately rotates counterclockwise, and the end thereof is maintained in contact with the stopper 12a as shown in FIG. During the forward traveling of the vehicle, the partition plate 9 is maintained in such a state, whereby the vent hole 13a is maintained in a closed state, and conversely, the vent hole 13b is maintained in a largely open state. That is, intrusion of the lubricating oil OIL into the breather chamber 4 is prevented, and the breather function as the breather structure is also ensured and maintained satisfactorily. Further, for example, even if the lubricating oil OIL may temporarily enter the breather chamber 4 through the vent hole 13a at the time of transition to the state illustrated in FIG. By being in the state illustrated in b), the lubricating oil OIL is smoothly circulated to the gear chamber 6 through the vent hole 13b and the flat upper surface of the inclined partition plate 9. Become. Such an operation as a movable closing mechanism through the partition plate 9 is based on the splashing and scattering of the lubricating oil OIL in the direction of the broken line arrow 14b shown in FIG. The partition plate 9 is basically the same except that the rotation direction of the partition plate 9 is clockwise. That is, in this case, the vent hole 13b is maintained in a closed state, and conversely, the vent hole 13a is maintained in a largely open state.

As described above, according to the breather structure of the final reduction gear device according to the first embodiment, the following excellent effects can be obtained.
(1) Through the rotation of the partition plate 9 that constitutes the movable closing mechanism, only the ventilation hole facing the scattering direction of the lubricating oil OIL in the ventilation holes 13a and 13b is dynamically changed, that is, the occasion of the lubricating oil OIL. Only the air holes facing in the scattering direction are selectively closed. For this reason, the intrusion of the lubricating oil OIL into the breather chamber 4 when the vehicle moves forward or backward is accurately prevented with a high degree of freedom. Moreover, in this case, the rotation of the partition plate 9 does not close the vent hole on the other side of the closed vent hole, but rather opens it largely, so that the gear chamber 6 and the breather chamber 4 are opened. The breather function is also maintained at a high level. Even if the lubricating oil OIL enters the breather chamber 4, the lubricating oil OIL is circulated to the gear chamber 6 through the non-blocked vent holes. That is, the retention of the lubricating oil OIL with respect to the breather chamber 4 is accurately prevented. Further, the partition plate 9 has an extremely simple structure that rotates by using the biasing force of the lubricating oil OIL that is repelled as the gear group rotates, and is easily realized.

  (2) The partition plate 9 is formed so that the surface facing the gear chamber 6 has a curvature surface that protrudes with curvature from both end portions located in the vehicle front-rear direction to the center portion in the same direction. The protruding portion having the curvature surface is supported on the partition walls 11 a and 11 b by the shaft 10. As a result, the urging force of the lubricating oil OIL to the front or the rear of the vehicle repelled with the rotation of the gear group acts more smoothly and efficiently on the partition plate 9, and consequently the partition plate 9. As a result, smoother rotation can be obtained.

  (3) Similarly, the surface of the partition plate 9 facing the breather chamber 4 is formed in a flat plate shape. Thereby, when the lubricating oil OIL enters the breather chamber 4, the circulating flow of the lubricating oil OIL to the gear chamber 6 through the largely open vent hole is also favored. .

(Second Embodiment)
4 (a) and 4 (b) are enlarged views of the structure of the partition plate constituting the movable closing mechanism for the second embodiment of the breather structure of the final reduction gear device according to the present invention. Hereinafter, the breather structure of the final reduction gear device according to the second embodiment will be described in detail with a focus on differences from the breather structure according to the first embodiment shown in FIGS.

  First, as shown in FIG. 4A, in the breather structure according to the second embodiment, the partition plate 90 constituting the movable closing mechanism is supported by the partition walls 11a and 11b (FIG. 1). As viewed from the reference side, that is, as viewed from the previous FIG. 2 side, each plate has a plate portion 91 corresponding to the horizontal side and a plate portion 92 corresponding to the vertical side. A shaft 10 serving as a pivot for pivoting the partition plate 90 is provided at the center of the plate portion 92 corresponding to the T-shaped vertical side or in the vicinity thereof.

  On the other hand, in the partition plate 90, the front and rear direction of the plate portion 92 corresponding to the vertical side, that is, the front shape seen from the side in FIG. 1, is pivotally supported by the partition walls 11a and 11b as shown in FIG. The upper and lower shafts 10 are formed in different shapes with the position of the shaft 10 as a boundary. That is, when the surface shape of the upper portion 92a with the position of the shaft 10 as a boundary is S1, and the surface area of the lower portion 92b with the position of the shaft 10 as a boundary is S2, the front shape of the plate portion 92 is “ The shape is set to “S1 >> S2”. As a result, when an urging force such as that shown by the arrow 14a in FIG. 4A due to the scattering of the lubricating oil OIL acts on the partition plate 90, the effect of assisting the rotation of the partition plate 90 by the urging force is also obtained. Be encouraged.

In addition, in the breather structure according to the second embodiment, the items described with reference to FIGS. 2 and 3, that is, (a) the counterclockwise direction around the shaft 10 or the clockwise direction. The end portion of the partition plate 90 (the end portion of the plate portion 91) that is rotated in contact with the stopper 12 a or 12 b provided in the breather chamber 4.
(B) By contact of the end of the partition plate 90 with the stoppers 12a or 12b, the air holes 13a and 13b on the side facing the direction in which the lubricating oil OIL scatters are closed. The vents on the side that does not face the direction must be kept largely open. That is, the intrusion of the lubricating oil OIL into the breather chamber 4 is prevented, and the breather function as the breather structure is well secured and maintained.
(C) Even if the lubricating oil OIL may temporarily enter the breather chamber 4, the upper surface of the plate portion 91 of the inclined partition plate 90, that is, the upper surface of the plate portion 91 having a flat plate shape. The lubricating oil OIL should be smoothly circulated to the gear chamber 6 through.
Etc. are the same as the breather structure according to the first embodiment.

  For this reason, also by the breather structure of the final reduction gear device according to the second embodiment, the effects (1) and (3) of the previous breather structure of the first embodiment are the same as or equivalent to those effects. The equivalent effect can be obtained, and the following effect can be obtained as an alternative to the effect (2).

  (4) A shaft 10 serving as a pivot of the partition plate 90 is provided at the center of the plate portion 92 corresponding to the vertical side of the T-shaped partition plate 90 viewed from the side or in the vicinity thereof. . And the front surface shape of the partition plate 90, specifically, the front surface shape of the plate portion 92, the surface area of the upper portion 92a with the position of the shaft 10 as the boundary is S1, and the position of the shaft 10 is also the boundary. When the surface area of the lower portion 92b is S2, the shape is set to “S1 >> S2”. For this reason, the urging force of the lubricating oil OIL to the front or the rear of the vehicle repelled with the rotation of the gear group acts more smoothly and efficiently on the partition plate 90, and the partition plate by the urging force The rotation support effect of 90 is further promoted.

(Other embodiments)
The above-described embodiments can be implemented with the following modifications.
In the second embodiment, as illustrated in FIG. 4B, the surface area of “S1 >> S2” with respect to the front shape of the plate portion 92 corresponding to the vertical side of the T-shaped partition plate 90. In order to obtain the above relationship, the same relationship is set according to the size of each rectangular portion positioned in the vertical direction with the axis 10 as the center, but such a method for setting the surface area relationship is arbitrary. That is, the surface area relationship of “S1 >> S2” can also be obtained by changing the front shape of the plate portion 92 to an inverted triangle. In an extreme case, in the shape illustrated in FIG. 4B, the lower portion 92b may be omitted from the position of the shaft 10, or the lower portion 92b may have the same shape as the upper portion 92a. The shaft 10 itself may be provided at a lower position.

  On the other hand, the partition plate 9 constituting the movable closing mechanism in the first embodiment does not necessarily have the above-described curvature surface formed on the surface facing the gear chamber 6, and the gear group can be rotated. Accordingly, the partition plate 9 may be structured to receive the above-described rotational moment by the lubricating oil OIL repelled forward or rearward of the vehicle. As long as it has such a structure, the arrangement position of the shaft 10 is not limited to the portion protruding to the gear chamber 6 side. For example, the shaft 10 is arranged at the center in the thickness direction. May be provided.

  In both the first and second embodiments, the surface of the partition plate 9 constituting the movable closing mechanism or the partition plate 90 facing the breather chamber 4 is formed in a flat plate shape. This movable closing mechanism itself has a structure in which the lubricating oil OIL that has entered the breather chamber 4 is easily discharged (circulated) to the gear chamber 6 through the vent hole on the side that is largely opened. For this reason, the shape of the partition plate 9 or the surface of the partition plate 90 facing the breather chamber 4, that is, the top surface shape is not necessarily limited to a flat plate shape, but is arbitrary.

  Similarly, in both of the first and second embodiments, the breather chamber 4 extends in the vehicle front-rear direction, and the partition plate 9 that covers the breather chamber 4 from the gear chamber 6 side, or the front and rear of the partition plate 90 in the vehicle. By preventing the lubricating oil OIL from entering the breather chamber 4 through rotation in the direction, the breather function is maintained. However, depending on the arrangement of the gear group constituting the final reduction gear 1, the relationship between these parts is also arbitrary, and the breather structure is basically applied with lubricating oil that repels as the gears constituting the differential gear rotate. What is necessary is just to have a movable closing mechanism that has a partition plate that rotates based on the force and dynamically closes a vent hole that faces the splash direction of the lubricating oil among the vent holes from the gear chamber to the breather chamber. .

The fragmentary sectional view which shows the fragmentary sectional structure seen from the front direction about 1st Embodiment of the breather structure of the final reduction gear apparatus concerning this invention. The side schematic diagram which shows typically the internal structure of the breather structure of the embodiment. (A) And (b) is a fragmentary sectional side view which shows the operation example of the partition plate which comprises a movable closing mechanism in the breather structure of the embodiment. (A) And (b) is the side view and front view which show the structure of the partition plate which comprises the movable closing mechanism about 2nd Embodiment of the breather structure of the final reduction gear apparatus concerning this invention. Side surface schematic drawing which shows the example about the breather structure of the conventional final reduction gear. The perspective view which shows the perspective structure of the partition member employ | adopted as the conventional breather structure.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Final reduction gear, 2 ... Carrier, 4 ... Breather chamber, 5 ... Breather plug, 5a ... Communication hole, 6 ... Gear chamber, 7 ... Differential gear, 7a ... Ring gear, 8 ... Pinion gear (drive pinion gear), 9, 90 ... partition plate, 10 ... shaft, 11a, 11b ... partition wall, 12a, 12b ... stopper, 13a, 13b ... vent hole, 91, 92 ... plate part, OIL ... lubricating oil.

Claims (6)

A gear group that rotates and drives the drive wheels while allowing differential rotation of the drive wheels by meshing the pinion gears to which power is transmitted and the differential device is accommodated, and lubricating oil that lubricates the gear groups is stored. In a breather structure of a final reduction device that includes a gear chamber and releases the internal pressure of the gear chamber to the atmosphere through a breather chamber provided at the top of the gear chamber.
A partition plate that rotates based on an urging force of the lubricating oil repelled with rotation of a gear that constitutes the differential device, and the lubricating oil in the vent hole extending from the gear chamber to the breather chamber. A breather structure for a final reduction gear, which is provided with a movable closing mechanism that dynamically closes a vent hole facing in the scattering direction. The breather chamber projects from the upper part of the gear chamber to the inner side of the gear chamber, and is sandwiched between partitions that are spaced apart in the width direction of the vehicle on which the final reduction gear is mounted. The movable closing mechanism covers a room extending in the vehicle front-rear direction of the breather chamber from the gear chamber side, and extends in the front-rear direction of the vehicle. The partition plate is provided in such a manner that a central portion with respect to the direction is pivotally supported by the partition wall, and each end portion of the partition plate positioned in the vehicle longitudinal direction and the breather chamber in the vehicle longitudinal direction. A vent hole extending from the gear chamber to the breather chamber is formed by a gap between each extending portion of the extending chamber, and the rotation at each end in the vehicle longitudinal direction of the chamber forming the breather chamber Corresponding edge of the finished divider Breather structure of the final reduction gear according to claim 1, but made is provided a stepped stopper that contacts. The partition plate constituting the movable closing mechanism is formed so that a surface facing the gear chamber has a curvature surface that protrudes with a curvature from both ends located in the vehicle front-rear direction to a center portion in the same direction. The breather structure of the final reduction gear device according to claim 2, wherein a support shaft that is pivotally supported by the partition wall is provided at a portion that has the curvature surface and protrudes. The breather structure of the final reduction gear according to claim 3, wherein a surface of the partition plate facing the breather chamber is formed in a flat plate shape. The partition plate constituting the movable closing mechanism is formed in a T shape when viewed from the partition side supporting the partition plate, and the partition plate is located at the center corresponding to the T-shaped vertical side or in the vicinity thereof. The breather structure of the final reduction gear according to claim 2, wherein a support shaft that is pivotally supported is provided. The front surface of the partition plate formed in a T shape when viewed from the partition wall side when viewed from the vehicle front-rear direction of the portion corresponding to the vertical side is the surface area of the upper portion with respect to the position of the support shaft pivotally supported by the partition wall. The final deceleration according to claim 5, wherein S1 is set to a shape of "S1 >>S2" where S1 is the surface area of the lower portion with the position of the support shaft pivotally supported by the partition wall as S2. The breather structure of the device.

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