JP2024034449A - vehicle transfer - Google Patents

Abstract

To provide a vehicle transfer which can inhibit entry of oil overflowing from an oil receiver into a breather chamber.SOLUTION: Even if oil flowing out from an oil receiver 48 flows to a breather chamber 40, the oil collides with a wall 62 provided between the oil receiver 48 and the breather chamber 40 and thus a direction of oil flow is changed. Consequently, entry of the oil into the breather chamber 40 can be inhibited. Further, since the wall 62 is integrally molded with a cover 26 and the oil receiver 48 by casting, increasing of manufacturing costs for forming the wall 62 can be inhibited.SELECTED DRAWING: Figure 5

Description

The present invention relates to a vehicular transfer that includes a breather chamber within a transfer case.

2. Description of the Related Art Vehicle transfers are known that include a pinion gear, a transfer case that accommodates the pinion gear, and a bearing that is attached to the transfer case and rotatably supports the pinion gear. This is the vehicle transfer disclosed in Patent Document 1. Patent Document 1 discloses a breather that is partitioned by a partition wall from a gear chamber that accommodates a pinion gear in a transfer case, and communicates with the gear chamber through a communication hole formed in the partition wall to adjust the pressure inside the transfer case. A structure is disclosed that includes a chamber and a feed hole for supplying oil to the bearing. Further, Patent Document 1 discloses a structure including an oil receiver that captures oil scraped up by a pinion gear and causes the oil to flow toward a feed hole.

JP2019-211060A

By the way, in Patent Document 1, when the amount of oil captured by the oil receiver increases, there is a possibility that the oil overflows from the oil receiver and the overflowing oil enters the breather chamber.

The present invention has been made against the background of the above-mentioned circumstances, and its purpose is to provide a vehicle transfer that can suppress oil overflowing from an oil receiver from entering a breather chamber. be.

The gist of the present invention is as follows: (a) a pinion gear, a transfer case that accommodates the pinion gear, a bearing that is attached to the transfer case and rotatably supports the pinion gear, and a bearing that is formed on the transfer case and that supports the pinion gear; a breather chamber that is divided by a partition wall from a gear chamber that accommodates a pinion gear, and that communicates with the gear chamber through a communication hole formed in the partition wall to adjust pressure within the transfer case; and a breather chamber that is formed in the transfer case. (b) a transmission hole for supplying oil to the bearing; and an oil receiver that captures oil scraped up by the pinion gear and flows the oil toward the transmission hole. The invention is characterized in that a wall is formed between the oil receiver and the breather chamber to prevent oil flowing out from the oil receiver from entering the breather chamber.

According to the present invention, even when oil flowing out from the oil receiver flows toward the breather chamber, the oil collides with the wall provided between the oil receiver and the breather chamber, so that the oil flow is prevented. direction can be changed. As a result, it is possible to suppress oil from flowing into the breather chamber.

FIG. 1 is a sectional view of a vehicle transfer to which the present invention is applied. FIG. 2 is a perspective view of the transfer case of FIG. 1; 3 is a diagram of the transfer case of FIG. 2 viewed from the direction of arrow A. FIG. FIG. 3 is a perspective view of the cover. FIG. 3 is a view of the cover viewed from a direction perpendicular to the plane.

Embodiments of the present invention will be described in detail below with reference to the drawings. Note that in the following examples, the figures are simplified or modified as appropriate, and the dimensional ratios, shapes, etc. of each part are not necessarily drawn accurately.

FIG. 1 is a sectional view of a vehicle transfer 10 (hereinafter referred to as transfer 10) to which the present invention is applied. The transfer 10 is a device that distributes power from a transmission (not shown) to front wheels and rear wheels. The transfer 10 includes a disconnect mechanism 12 that connects and disconnects a power transmission path to the rear wheel side, and a pinion gear 16 that meshes with a ring gear 14 that is an output rotation member of the disconnect mechanism 12. Both the disconnect mechanism 12 and the pinion gear 16 are housed within a transfer case 18. Since the disconnect mechanism 12 is a well-known technology, its explanation will be omitted.

The pinion gear 16 is housed in a round hole 20 formed in the transfer case 18, and is rotatably supported by a pair of bearings 22a and 22b attached to the transfer case 18. The pinion gear 16 is connected to a propeller shaft (not shown). The tooth portion 16a of the pinion gear 16 is housed in a gear chamber 28, which is a space formed within the transfer case 18.

When the pinion gear 16 rotates in the forward direction of the vehicle, the oil scraped up by the pinion gear 16 scatters in the direction indicated by the dashed arrow. An opening hole 24 is formed in the transfer case 18 at a position where the scattered oil is directed, and this opening hole 24 is closed by a cover 26. Therefore, the gear chamber 28 and the external space of the transfer 10 are partitioned by the cover 26. Cover 26 is fixed to transfer case 18 with a plurality of bolts 30, and functions as a part of transfer case 18.

Next, the structure of the transfer case 18 will be explained. 2 is a perspective view of the transfer case 18, and FIG. 3 is a view of the transfer case 18 in FIG. 2 viewed from the direction of arrow A. 2 and 3 are each shown with cover 26 removed. A front wheel axle (not shown) is fitted into the boss 32 shown in FIGS. 2 and 3. In this embodiment, when the vehicle is mounted on a flat road, the center axis CLP, which is the center of rotation of the pinion gear 16, is located above the center axis CL, which is the center of rotation of the ring gear 14.

The transfer case 18 is formed with a first mating surface 34 and a second mating surface 36 that are perpendicular to the central axis CL. A cover case (not shown) is attached to the first mating surface 34 with bolts. The cover 26 shown in FIG. 1 is attached to the second mating surface 36 with bolts 30.

The portion of the transfer case 18 where the second mating surface 36 is formed has a predetermined thickness in the direction of the central axis CL. Further, a recess 38 is formed in the region where the second mating surface 36 is formed. The recess 38 is a bottomed recess having a predetermined depth, and is formed by casting or cutting. Thereby, by attaching the cover 26 to the second mating surface 36, a breather chamber 40, which is a space surrounded by the recess 38 and the cover 26, is formed. Further, a communication hole 42 is formed in a partition wall 41 that partitions the breather chamber 40 and the gear chamber 28. Therefore, the breather chamber 40 and the gear chamber 28 communicate with each other via the communication hole 42.

The breather chamber 40 communicates with a breather hole (not shown), and is connected to the external space of the transfer case 18 via the breather hole. Therefore, when the pressure within the gear chamber 28 of the transfer case 18 increases, the air within the gear chamber 28 is discharged via the breather chamber 40 and the breather hole, thereby adjusting the pressure within the transfer case 18. be done.

Next, a mechanism for supplying oil to a pair of bearings 22a and 22b that rotatably support pinion gear 16 will be described. As shown in FIGS. 2 and 3, an oil receiving portion 44 is formed on a wall surface forming the gear chamber 28 of the transfer case 18. The oil receiving portion 44 is formed in a gutter shape extending from the second mating surface 36 in the direction of the central axis CL. The oil receiving portion 44 is connected to a feed hole 46 formed in the transfer case 18. As shown in FIG. 1, the feed hole 46 passes through the transfer case 18 and communicates with the inner peripheral surface of the round hole 20 to which the bearings 22a and 22b are attached. Therefore, the oil supplied to the oil receiving portion 44 is supplied to the bearings 22a and 22b through the feed hole 46. In this way, the feed hole 46 functions as a supply oil path for supplying oil to the bearings 22a and 22b.

Further, the cover 26 is provided with an oil receiver 48 for capturing the oil scooped up by the pinion gear 16 and flowing the oil toward the feed hole 46 via the oil receiving portion 44. During forward travel, oil scraped up by the pinion gear 16 scatters toward the cover 26 as shown by the broken line arrow in FIG. The oil receiver 48 is provided at a position overlapping the tooth portion 16a in the radial direction of the pinion gear 16 so as to capture oil scattered toward the cover 26. Note that the specific shape of the oil receiver 48 will be described later.

FIG. 4 is a perspective view of the cover 26. FIG. 5 is a front view of the cover 26. FIG. 5 also corresponds to a view of the cover 26 viewed from a direction perpendicular to the plane 52 that is in surface contact with the second mating surface 36 when the cover 26 is attached. In FIG. 5, the upper part of the paper corresponds to the vertically upper part in the vehicle mounted state. Note that in FIG. 5, a communication hole 42 formed on the transfer case 18 side is illustrated for convenience.

The cover 26 is formed by casting an aluminum alloy (aluminum die casting). Further, the oil receiver 48 and a wall 62, which will be described later, are also integrally formed with the cover 26 by casting. A plurality of through holes 50 are formed in the edge of the cover 26 for attaching the cover 26 to the transfer case 18. When attaching the cover 26, the cover 26 is bolted to the transfer case 18 with the bolt 30 inserted into the through hole 50. In the attached state where the cover 26 is attached to the transfer case 18, the second mating surface 36 and the flat surface 52 of the cover 26 are brought into surface contact. At this time, the gear chamber 28 and the external space of the transfer case 18 are partitioned by the cover 26.

Further, the cover 26 is formed with a first cover side recess 54 and a second cover side recess 55 which are recessed in the thickness direction of the cover 26. The first cover-side recess 54 is formed at a position that overlaps with an inner wall surface 66 (see FIGS. 2 and 3) of the transfer case 18 that forms the gear chamber 28 when the cover 26 is attached. Therefore, a part of the gear chamber 28 is also formed by the first cover side recess 54 . Further, a part of the oil receiving portion 44 is also formed by the first cover side recess 54 . The second cover-side recess 55 is formed at a position overlapping the recess 38 formed on the transfer case 18 side when the cover 26 is attached. Therefore, when the cover 26 is attached, the breather chamber 40 is formed by the recess 38 and the second cover-side recess 55.

The oil receiver 48 stands vertically from the bottom surface of the first cover-side recess 54 . The height of the first cover-side recess 54 of the oil receiver 48 from the bottom surface is set to a size that does not interfere with the teeth 16a of the pinion gear 16 when the cover 26 is attached.

The oil receiver 48 is formed at a position higher than the oil receiving portion 44 in the vertical direction when mounted on the vehicle. The oil receiver 48 is formed in an L-shape when viewed from a direction perpendicular to the plane 52. The oil receiver 48 includes a horizontal wall portion 56 for capturing oil scattered toward the cover 26, and a vertical wall portion 58 that is connected to one end of the horizontal wall portion 56 and extends perpendicularly from one end of the horizontal wall portion 56. ing.

The horizontal wall portion 56 is formed substantially horizontally when mounted on the vehicle. Alternatively, the horizontal wall portion 56 is formed to be slightly inclined downward as it approaches the oil receiving portion 44 when mounted on the vehicle. Therefore, the oil scattered toward the cover 26 is captured by the side wall portion 56, and the captured oil flows down toward the oil receiving portion 44. Further, an oil guide portion 60 is formed in a portion of the horizontal wall portion 56 that faces the oil receiving portion 44 . As shown in FIG. 5, when the oil guide section 60 is viewed from vertically above while mounted on a vehicle, a portion of the oil guide section 60 extends to a position overlapping with the oil receiving section 44. Further, the oil guide portion 60 is inclined downward toward the oil receiving portion 44 when mounted on the vehicle. Therefore, oil flowing toward the oil receiving portion 44 of the side wall portion 56 is supplied to the oil receiving portion 44 via the oil guide portion 60.

The vertical wall portion 58 extends in the vertical direction from the end of the horizontal wall portion 56 on the opposite side to the oil guide portion 60 when mounted on the vehicle. By forming the vertical wall portion 58, the oil captured by the horizontal wall portion 56 is suppressed from flowing to the opposite side to the oil guide portion 60.

Here, if the amount of oil captured by the horizontal wall portion 56 increases, the amount of oil supplied to the oil receiving portion 44 may become excessive and may overflow from the oil receiving portion 44. At this time, there is a possibility that the overflowing oil may pass through the communication hole 42 formed in the transfer case 18 and enter the breather chamber 40 . Additionally, there is a possibility that some of the oil may climb over the vertical wall portion 58 and enter the breather chamber 40 through the communication hole 42. In order to prevent the oil from entering the breather chamber 40, the cover 26 is formed with a wall 62 to prevent oil flowing out from the oil receiver 48 from entering the breather chamber 40.

As shown in FIG. 4, the wall 62 stands vertically from the bottom surface of the first cover-side recess 54. As shown in FIG. The height of the wall 62 from the bottom of the first cover-side recess 54 is the same or approximately the same as the height of the oil receiver 48 from the bottom of the first cover-side recess 54 .

As shown in FIG. 5, the wall 62 is formed in a longitudinal shape so as to block the space between the oil receiver 48 and the communication hole 42 that communicates with the breather chamber 40 when viewed from a direction perpendicular to the plane 52. has been done. Specifically, the wall 62 extends vertically from the same position as the oil receiver 48 toward the oil receiver 48, and is inclined downward as it approaches the oil receiver 48. The wall 62 is inclined at about 45 degrees with respect to a horizontal plane when mounted on a vehicle. As a result, the wall 62 does not interfere with the oil receiver 48, and the tip of the wall 62 extends to a position below the oil receiver 48 in the vertical direction when mounted on the vehicle.

By forming the wall 62, oil flowing out from the oil receiver 48 is prevented from entering the breather chamber 40. The arrows shown in FIG. 5 indicate the flow of oil flowing out from the oil receiver 48. As shown by the arrow in FIG. , the oil moves downward along the wall 62. Further, even if a part of the oil captured by the oil receiver 48 climbs over the vertical wall portion 58 and flows out toward the communication hole 42, the oil collides with the wall 62 and the oil flows into the wall. 62 and move downward. As a result, oil flowing out from the oil receiver 48 is prevented from entering the breather chamber 40 through the communication hole 42. Here, since the wall 62 is integrally formed by casting together with the cover 26 and the oil receiver 48, there is no need to add any additional parts to form the wall 62. Therefore, when forming the wall 62, a significant increase in manufacturing cost is also prevented.

As described above, according to this embodiment, even if the oil flowing out from the oil receiver 48 flows toward the breather chamber 40, the wall provided between the oil receiver 48 and the breather chamber 40 Since the oil collides with 62, the direction of the oil flow can be changed. As a result, the flow of oil into the breather chamber 40 can be suppressed. Moreover, since the wall 62 is integrally formed by casting together with the cover 26 and the oil receiver 48, an increase in manufacturing cost in forming the wall 62 is suppressed.

Although the embodiments of the present invention have been described above in detail based on the drawings, the present invention can also be applied to other aspects.

For example, in the above embodiment, the first cover side recess 54 and the second cover side recess 55 were formed in the cover 26, but the present invention does not necessarily require that the first cover side recess 54 and the second cover side recess 54 be formed in the cover 26. The recess 55 is not required. That is, the oil receiver 48 and the wall 62 may be erected from the plane 52.

Further, in the above embodiment, the communication hole 42 is formed in the partition wall 41 of the transfer case 18, but the communication hole may be formed in the cover 26 side. Note that the cover 26 functions as a part of the transfer case 18 when it is attached to the transfer case 18.

Further, in the above embodiment, the wall 62 was formed in a longitudinal shape when viewed from a direction perpendicular to the plane 52 of the cover 26, but the shape of the wall 62 is not necessarily limited to this. The shape of the wall 62 may be changed as appropriate within the range formed so as to block the space between the oil receiver 48 and the breather chamber 40.

Note that the above-mentioned embodiment is merely one embodiment, and the present invention can be implemented with various modifications and improvements based on the knowledge of those skilled in the art.

10: Vehicle transfer 16: Pinion gear 18: Transfer case 22a, 22b: Bearing 26: Cover 28: Gear chamber 40: Breather chamber 41: Partition wall 42: Communication hole 46: Spread hole 48: Oil receiver 62: Wall

Claims (2)

a pinion gear; a transfer case that accommodates the pinion gear; a bearing that is attached to the transfer case and rotatably supports the pinion gear; and a gear chamber that is formed in the transfer case and that accommodates the pinion gear and is partitioned by a partition wall. a breather chamber that communicates with the gear chamber through a communication hole formed in the partition wall to adjust the pressure within the transfer case; and a feed hole formed in the transfer case to supply oil to the bearing. A vehicle transfer comprising: an oil receiver that captures oil scraped up by the pinion gear and causes the oil to flow toward the feed hole,
A vehicle transfer characterized in that a wall is formed between the oil receiver and the breather chamber to prevent oil flowing out from the oil receiver from entering the breather chamber. A cover that partitions the gear chamber and an external space is attached to a position of the gear chamber where the oil scraped up by the pinion gear is directed,
The vehicle transfer according to claim 1, wherein the cover, the oil receiver, and the wall are integrally formed by casting.

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