JP2016041976A - Vehicular transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve fuel efficiency while reducing the amount of oil, by enabling the supply of lubricating oil even to a bearing for a drive pinion gear while lowering an oil level to suppress an agitation resistance to a ring gear.SOLUTION: A vehicular transmission device 1 includes a case 2 where lubricating oil is stored, a rotatable ring gear 3 housed in the case 2, a ring-gear bearing 6 for rotatably supporting the ring gear, a drive pinion gear 4 for rotating the ring gear 3 in engagement therewith, a drive-pinion-gear bearing 8 for rotatably supporting the drive pinion gear 4, a baffle plate 5 covering the lower part of the ring gear 3, and a drive-pinion-gear storage part 9 provided near the drive-pinion-gear bearing 8 for storing lubricating oil at a position higher than the oil level of the lubricating oil stored in the case 2 so that the lower part of the drive-pinion-gear bearing 8 is immersed in the lubricating oil.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicle transmission.

2. Description of the Related Art Conventionally, in a vehicle transmission, a drive pinion gear that meshes with a ring gear is lubricated by rotating the ring gear and scooping up lubricating oil in the case (see, for example, Patent Document 1).
2A and 2B are schematic views showing the configuration of a main part of a conventional vehicle transmission device, where FIG. 2A is a view seen from the direction of arrow A in FIG. 2B, and FIG. It is a figure.
Hereinafter, a specific description will be given with reference to FIG.
As shown in FIG. 2, in a case 101 provided in a conventional vehicle transmission device, a ring gear 103 that is rotatably supported via a bearing 102 with respect to the case 101, and the ring gear 103 to rotate the ring gear 103. And a drive pinion gear 104 that meshes with the drive pinion gear 104. The drive pinion gear 104 is rotatably supported with respect to the case 101 via a bearing 105. The drive pinion gear 104 is integrally formed with a drive shaft 106 to which a propulsion shaft (not shown) is fastened. When engine power is transmitted to the drive shaft 106 via the propulsion shaft, the drive pinion gear 104 rotates, and the ring gear 103 rotates accordingly.
The lower part of the ring gear 103 is covered with a baffle plate 107 for reducing the stirring resistance.
The bearings 102 and 105 are disposed at substantially the same height, and lubricating oil is stored inside the case 101 so that the lower portions of the bearings 102 and 105 are immersed. The oil surface of the lubricating oil is a one-dot chain line L4 in FIG.

JP 2010-209555 A

However, in order to ensure the lubricity of the bearing 105 of the drive pinion gear 104, if the oil level L4 is set such that the bearing 105 is immersed in the lubricating oil, the portion of the ring gear 103 that is immersed in the lubricating oil increases, and the agitation resistance also increases. End up. An increase in stirring resistance leads to deterioration in fuel consumption, which is not preferable.
The object of the present invention is to reduce the oil level and suppress the agitation resistance to the ring gear, while also enabling the supply of lubricating oil to the bearing of the drive pinion gear. It is to improve.

In order to solve the above problems, a vehicle transmission according to the invention described in claim 1 is provided.
A case where lubricating oil is stored;
A ring gear housed inside the case and rotatable relative to the case;
A ring gear bearing that rotatably supports the ring gear with respect to the case;
A drive pinion gear that meshes with the ring gear inside the case and rotates the ring gear;
A drive pinion gear bearing that rotatably supports the drive pinion gear with respect to the case;
A baffle plate covering the lower part of the ring gear;
In order to store the lubricating oil at a position higher than the oil level of the lubricating oil stored in the case and immerse the lower part of the drive pinion gear bearing in the lubricating oil, in the vicinity of the drive pinion gear bearing. And a drive pinion gear storage section provided.

  According to the first aspect of the present invention, since the drive pinion gear storage section immerses the lower part of the drive pinion gear bearing in the lubricating oil, the lubricating oil can be reliably supplied to the drive pinion gear bearing. Moreover, since the oil level of the lubricating oil in the case is lower than the oil level of the lubricating oil stored in the drive pinion gear storage unit, the amount of oil can be reduced and the stirring resistance against the ring gear can be suppressed. Therefore, fuel consumption can be improved.

According to a second aspect of the present invention, in the vehicle transmission device according to the first aspect,
In order to store the lubricating oil at a position higher than the oil level of the lubricating oil stored in the case and to immerse the lower part of the ring gear bearing in the lubricating oil, it is provided in the vicinity of the ring gear bearing. And a ring gear storage section.

  According to the second aspect of the present invention, since the ring gear storage section immerses the lower part of the ring gear bearing in the lubricating oil, the lubricating oil can be reliably supplied to the ring gear bearing. Moreover, since the oil level of the lubricating oil in the case is lower than the oil level of the lubricating oil stored in the ring gear storage section, the stirring resistance against the ring gear can be suppressed, and the fuel consumption can be further improved.

  According to the present invention, it is possible to supply lubricating oil to the bearings of the drive pinion gear while reducing the height of the oil surface to suppress the stirring resistance to the ring gear, and to improve fuel efficiency while ensuring lubrication positiveness. be able to.

It is explanatory drawing which shows typically the principal part structure of the transmission for vehicles which concerns on this embodiment. It is explanatory drawing which shows typically the principal part structure of the conventional vehicle transmission.

  Embodiments of the present invention will be described below with reference to the drawings. The following is one embodiment of the present invention and does not limit the present invention.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is an explanatory view schematically showing a configuration of a main part of a transmission for a vehicle according to the present embodiment, where (a) is a view seen from the direction of arrow A in (b), and (b) is (a). It is the figure seen from the arrow B direction. In the present embodiment, the case where the vehicle transmission device 1 is arranged so that a drive shaft 41 described later is inclined with respect to a horizontal plane is illustrated. A direction along the axial direction of the drive shaft 41 is represented by A. The direction.

  As shown in FIG. 1, the vehicular transmission 1 includes a case 2, a ring gear 3 that is accommodated in the case 2 and is rotatable with respect to the case 2, and a ring gear 3 that meshes with the case 2. A drive pinion gear 4 that rotates the ring gear 3 and a baffle plate 5 that covers the lower part of the ring gear 3 and reduces stirring resistance are provided.

Lubricating oil is stored in the case 2 to such an extent that the lower part of the ring gear 3 and the lower part of the baffle plate 5 are immersed. The oil level of this lubricating oil is indicated by a one-dot chain line L1 in FIG.
The ring gear 3 is rotatably supported with respect to the case 2 by a pair of ring gear bearings 6. A first housing recess 21 in which the pair of ring gear bearings 6 is housed is formed inside the case 2. A ring gear storage 7 for storing lubricating oil in the first storage recess 21 is provided below the first storage recess 21.

The ring gear storage portion 7 is supported by the baffle plate 5 and extends in a horizontal direction so that the outer tip portion contacts the inner surface of the case 2. And a cover part 72 that covers the lower part of the first housing recess 21 from the inside of the case 2. Due to such a configuration, the lubricating oil in the first receiving recess 21 is blocked by the cover portion 72 and collected in the first receiving recess 21. The height of the cover portion 72 is a height that can maintain the lubricating oil accumulated in the first accommodating recess 21 to the extent that the lower portion of the ring gear bearing 6 is immersed. Moreover, it is preferable to provide the discharge port and slit which can discharge | emit only the excess amount in a predetermined height position so that the lubricating oil in the 1st accommodating recessed part 21 may not exceed a fixed amount.
And since the 1st accommodation recessed part 21 and the ring gear storage part 7 are arrange | positioned in the vicinity of the rotating shaft of the ring gear 3, the oil surface (one point in FIG. 1) of the lubricating oil collected in the 1st accommodation recessed part 21 by the ring gear storage part 7 (Indicated by a chain line L2) is arranged at a position higher than the oil level L1 of the lubricating oil in the case 2.

  The drive pinion gear 4 is integrally formed with a drive shaft 41 to which a propulsion shaft (not shown) is fastened. When the engine power is transmitted to the drive shaft 41 via the propulsion shaft, the drive pinion gear 4 rotates, and the ring gear 3 rotates accordingly. The drive pinion gear 4 is rotatably supported with respect to the case 2 by a drive pinion gear bearing 8. A second housing recess 22 in which the drive pinion gear bearing 8 is housed is formed inside the case 2. A drive pinion gear storage 9 for storing lubricating oil in the second storage recess 22 is provided below the second storage recess 22.

The drive pinion gear storage 9 is formed in a substantially fan-plate shape and covers the lower portion of the second housing recess 22 from the inside of the case 2 so as not to interfere with the drive pinion gear 4. The drive pinion gear reservoir 9 is in contact with the inner surface of the case 2, whereby the lubricating oil in the second housing recess 22 is blocked by the drive pinion gear reservoir 9 and collected in the second housing recess 22. It becomes. Here, the shape of the drive pinion gear storage section 9 is set so that the lubricating oil is stored in the second housing recess 22 so as to immerse the lower portion of the drive pinion gear bearing 8. Moreover, it is preferable to provide the discharge port and slit which can discharge | emit only the excess amount in a predetermined height position so that the lubricating oil in the 2nd accommodation recessed part 22 may not exceed a fixed amount.
Since the second housing recess 22 and the drive pinion gear reservoir 9 are disposed in the vicinity of the rotational axis of the drive pinion gear 4, the oil level of the lubricating oil collected in the second housing recess 22 by the drive pinion gear reservoir 9 (see FIG. 1 is indicated by a one-dot chain line L3) at a position higher than the oil level L1 of the lubricating oil in the case 2.

Hereinafter, the operation of the present embodiment will be described.
When the engine is driven and the power is transmitted to the drive shaft 41 via the propulsion shaft, the drive pinion gear 4 rotates, and the ring gear 3 rotates accordingly. At this time, the lubricating oil in the case 2 is scraped up by the rotating ring gear 3, and droplets of the lubricating oil are scattered in the case 2. Part of the scattered lubricating oil reaches the first accommodating recess 21 (see arrow U1 in FIG. 1), accumulates in the first accommodating recess 21, and lubricates the ring gear bearing 6.
In addition, the lubricating oil that has reached the drive pinion gear 4 from the ring gear 3 with the rotation gradually flows into the second housing recess 22 by centrifugal force (see arrow U2 in FIG. 1), and accumulates in the second housing recess 22 to drive the drive. Lubricate the pinion gear bearing 8.

  As described above, according to the present embodiment, the drive pinion gear reservoir 9 immerses the lower part of the drive pinion gear bearing 8 in the lubricating oil, so that the lubricating oil is reliably supplied to the drive pinion gear bearing 8. be able to. Further, since the oil level L1 of the lubricating oil in the case 2 is lower than the oil level L3 of the lubricating oil stored in the drive pinion gear storage unit 9, the amount of oil can be reduced, and the stirring resistance against the ring gear 3 can be reduced. Can be suppressed. Therefore, it is possible to improve fuel efficiency while ensuring lubrication positiveness.

Further, since the ring gear reservoir 7 immerses the lower part of the ring gear bearing 6 in the lubricating oil, the lubricating oil can be reliably supplied to the ring gear bearing 6 as well. Further, since the oil level L1 of the lubricating oil in the case 2 is lower than the oil level L2 of the lubricating oil stored in the ring gear storage 7, the stirring resistance against the ring gear 3 can be suppressed, and the fuel consumption is further increased. be able to.
Note that the present invention is not limited to the above embodiment, and can be modified as appropriate.

DESCRIPTION OF SYMBOLS 1 Vehicle transmission device 2 Case 3 Ring gear 4 Drive pinion gear 5 Baffle plate 6 Ring gear bearing 7 Ring gear reservoir 8 Drive pinion gear bearing 9 Drive pinion gear reservoir 21 First accommodation recess 22 Second accommodation recess 41 Drive shaft 71 Support 72 Cover part

Claims (2)

A case where lubricating oil is stored;
A ring gear housed inside the case and rotatable relative to the case;
A ring gear bearing that rotatably supports the ring gear with respect to the case;
A drive pinion gear that meshes with the ring gear inside the case and rotates the ring gear;
A drive pinion gear bearing that rotatably supports the drive pinion gear with respect to the case;
A baffle plate covering the lower part of the ring gear;
In order to store the lubricating oil at a position higher than the oil level of the lubricating oil stored in the case and immerse the lower part of the drive pinion gear bearing in the lubricating oil, in the vicinity of the drive pinion gear bearing. A vehicular transmission comprising: a drive pinion gear storage portion provided. The vehicle transmission according to claim 1, wherein
In order to store the lubricating oil at a position higher than the oil level of the lubricating oil stored in the case and to immerse the lower part of the ring gear bearing in the lubricating oil, it is provided in the vicinity of the ring gear bearing. A vehicular transmission comprising a ring gear storage.

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