JP6426400B2 - Transmission for vehicle - Google Patents

Description

  The present invention relates to a transmission for a vehicle.

Conventionally, in a transmission for a vehicle, a drive pinion gear meshing with a ring gear is lubricated by rotating the ring gear and scraping up lubricating oil in a case (see, for example, Patent Document 1).
FIG. 2 is a schematic view showing a main part configuration of a conventional transmission for a vehicle, wherein (a) is a view seen from the direction of arrow A in (b) and (b) is a view from the direction of arrow B in (a) FIG.
Hereinafter, this will be specifically described with reference to FIG.
As shown in FIG. 2, in a case 101 provided in a conventional vehicle transmission, a ring gear 103 rotatably supported on the case 101 via a bearing 102, and the ring gear 103 for rotating the ring gear 103. And a drive pinion gear 104 that meshes with the gear. The drive pinion gear 104 is rotatably supported by 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 the power of the engine is transmitted to the drive shaft 106 via the propulsion shaft, the drive pinion gear 104 rotates, and the ring gear 103 also rotates accordingly.
The lower part of the ring gear 103 is covered by a baffle plate 107 for reducing the stirring resistance.
The bearings 102 and 105 are disposed at substantially the same height position, and lubricating oil is stored inside the case 101 so that the lower portions of the bearings 102 and 105 are immersed. The oil level of the lubricating oil is the alternate long and short dash 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 bearing 105 has an oil surface L4 that is immersed in the lubricating oil, the portion immersed in the lubricating oil in the ring gear 103 becomes large, and the agitation resistance also increases. It will An increase in agitation resistance unfavorably leads to deterioration of fuel consumption.
The object of the present invention is to reduce the height of the oil level to suppress the stirring resistance to the ring gear, and also to supply lubricating oil to the bearing of the drive pinion gear, thereby ensuring positive lubrication while maintaining fuel consumption. To improve it.

A vehicle transmission according to the invention of claim 1 for solving the above problems is:
Cases where lubricating oil is stored;
A ring gear housed inside the case and rotatable relative to the case;
A ring gear bearing rotatably supporting the ring gear with respect to the case;
A drive pinion gear that meshes with the ring gear inside the case to rotate the ring gear;
A drive pinion gear bearing rotatably supporting the drive pinion gear with respect to the case;
A baffle plate covering a lower portion of the ring gear;
A storage chamber which communicates with the inside of the case and stores the drive pinion gear bearing;
The drive pinion gear has a cover that covers the lower part of the storage chamber from the inside of the case, and stores the lubricating oil in the storage chamber at a position higher than the oil level of the lubricating oil stored in the case. And a storage portion for a drive pinion gear for immersing a lower portion of the bearing for the lubricating oil.

  According to the first aspect of the present invention, since the storage portion for the drive pinion gear dips the lower portion of the drive pinion gear bearing in the lubricating oil, the lubricating oil can be reliably supplied to the drive pinion gear bearing. Further, 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 section, the amount of oil can be reduced, and the stirring resistance to the ring gear can be suppressed. Therefore, it is possible to improve fuel consumption.

The invention according to claim 2 relates to the transmission apparatus for a vehicle according to claim 1.
The lubricating oil is stored at a position higher than the oil surface of the lubricating oil stored in the case, and is provided near the ring gear bearing to immerse the lower portion of the ring gear bearing in the lubricating oil. It is characterized in that a ring gear storage unit is provided.

  According to the second aspect of the invention, since the ring gear storage section has the lower portion of the ring gear bearing immersed in the lubricating oil, the lubricating oil can be reliably supplied to the ring gear bearing. Further, 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 portion, the stirring resistance to the ring gear can be suppressed, and fuel consumption can be further enhanced.

  According to the present invention, it is possible to supply lubricating oil to the bearing of the drive pinion gear while lowering the height of the oil level to suppress the stirring resistance to the ring gear, and to improve the fuel consumption while securing the positive lubrication. be able to.

It is an explanatory view showing typically the important section composition of the transmission for vehicles concerning this embodiment. It is an explanatory view showing typically the important section composition of the conventional transmission for vehicles.

  Hereinafter, embodiments of the present invention will be described 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 an essential configuration of a transmission for a vehicle according to this embodiment, wherein (a) is a view as seen from the direction of arrow A in (b), (b) is (a) In the direction of arrow B in FIG. In the present embodiment, the case where the vehicle transmission 1 is disposed such that the drive shaft 41 described later is inclined with respect to the horizontal surface is illustrated, and the direction along the axial direction of the drive shaft 41 is A. It is the direction.

  As shown in FIG. 1, in the vehicle transmission 1, the case 2 is accommodated inside the case 2, and the ring gear 3 rotatable relative to the case 2 is meshed with the ring gear 3 inside the case 2. A drive pinion gear 4 for rotating the ring gear 3 and a baffle plate 5 for covering the lower side of the ring gear 3 to reduce the stirring resistance are provided.

The 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 dashed dotted line L1 in FIG.
The ring gear 3 is rotatably supported on the case 2 by a pair of ring gear bearings 6. Inside the case 2 is formed a first accommodation recess 21 in which a pair of ring gear bearings 6 are accommodated. A ring gear storage portion 7 for storing lubricating oil in the first accommodation recess 21 is provided below the first accommodation recess 21.

The ring gear storage portion 7 is supported by the baffle plate 5 and extends horizontally from the tip end portion of the support portion 71 so as to extend horizontally so that the outer tip end portion abuts the inner surface of the case 2 And a cover portion 72 that extends from the inside of the case 2 to the lower portion of the first accommodation recess 21. With such a configuration, the lubricating oil in the first accommodation recess 21 is blocked by the cover portion 72 and is accumulated in the first accommodation recess 21. The height of the cover portion 72 is such that the lubricating oil accumulated in the first accommodation recess 21 can be maintained so as to immerse the lower portion of the ring gear bearing 6. Moreover, it is preferable to provide the discharge port and slit which can discharge | emit only the amount which exceeded so that the lubricating oil in the 1st accommodation recessed part 21 may not exceed a fixed quantity in a predetermined | prescribed height position.
Since the first accommodation recess 21 and the ring gear storage 7 are disposed in the vicinity of the rotation shaft of the ring gear 3, the oil surface of the lubricating oil accumulated in the first accommodation recess 21 by the ring gear storage 7 (one point in FIG. The dashed line L2 is placed at a position higher than the oil surface 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 power of the engine is transmitted to the drive shaft 41 via the propulsion shaft, the drive pinion gear 4 is rotated, and the ring gear 3 is also rotated accordingly. The drive pinion gear 4 is rotatably supported by the drive pinion gear bearing 8 with respect to the case 2. Inside the case 2, a second accommodation recess 22 in which the drive pinion gear bearing 8 is accommodated is formed. A drive pinion gear storage portion 9 for storing lubricating oil in the second accommodation recess 22 is provided below the second accommodation recess 22.

The drive pinion gear storage portion 9 is formed in a substantially fan-like plate shape, and covers the lower portion of the second accommodation recess 22 from the inside of the case 2 so as not to interfere with the drive pinion gear 4. The drive pinion gear storage portion 9 is in contact with the inner surface of the case 2, whereby the lubricating oil in the second accommodation recess 22 is blocked by the drive pinion gear storage portion 9 and accumulated in the second accommodation recess 22. It becomes. Here, the shape of the storage portion 9 for the drive pinion gear is set such that the lubricating oil for immersing the lower portion of the drive pinion gear bearing 8 is accumulated in the second accommodation recess 22. Moreover, it is preferable to provide the discharge port and the slit which can discharge | emit only the amount which exceeded so that the lubricating oil in the 2nd accommodation recessed part 22 may exceed a fixed amount in a predetermined | prescribed height position.
Since the second accommodation recess 22 and the drive pinion gear storage 9 are disposed in the vicinity of the rotation shaft of the drive pinion gear 4, the oil surface of the lubricating oil accumulated in the second accommodation recess 22 by the drive pinion gear storage 9 (see FIG. 1 is indicated by the alternate long and short dash line L 3) is disposed at a position higher than the oil surface L 1 of the lubricating oil in the case 2.

Hereinafter, the operation of the present embodiment will be described.
When the engine is driven and its motive power is transmitted to the drive shaft 41 via the propulsion shaft, the drive pinion gear 4 rotates, and the ring gear 3 also 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. A part of the scattered lubricating oil reaches the inside of the first accommodation recess 21 (see arrow U1 in FIG. 1), accumulates in the first accommodation 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 as it is rotated gradually flows into the second accommodation recess 22 due to centrifugal force (see arrow U2 in FIG. 1) and accumulates in the second accommodation recess 22. The pinion gear bearing 8 is lubricated.

  As described above, according to the present embodiment, the storage portion 9 for the drive pinion gear immerses the lower portion 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 surface L1 of the lubricating oil in the case 2 is lower than the oil surface L3 of the lubricating oil stored in the drive pinion gear storage portion 9, the amount of oil can be reduced. It can be suppressed. Therefore, it is possible to improve fuel consumption while securing positive lubrication.

Further, since the lower part of the ring gear bearing 6 is immersed in the lubricating oil, the ring gear storage 7 can reliably supply the lubricating oil also to the ring gear bearing 6. Further, since the oil surface L1 of the lubricating oil in the case 2 is lower than the oil surface L2 of the lubricating oil stored in the ring gear storage 7, the stirring resistance to the ring gear 3 can be suppressed, and fuel consumption is further enhanced. be able to.
The present invention is not limited to the above embodiment, and can be appropriately modified.

1 Vehicle transmission 2 Case 3 Ring gear 4 Drive pinion gear 5 Baffle plate 6 Bearing for ring gear 7 Storage for ring gear 8 Bearing for drive pinion gear 9 Storage for drive pinion gear 21 First accommodation recess 22 Second accommodation recess 41 Drive shaft 71 Support Part 72 Cover

Claims (2)

Cases where lubricating oil is stored;
A ring gear housed inside the case and rotatable relative to the case;
A ring gear bearing rotatably supporting the ring gear with respect to the case;
A drive pinion gear that meshes with the ring gear inside the case to rotate the ring gear;
A drive pinion gear bearing rotatably supporting the drive pinion gear with respect to the case;
A baffle plate covering a lower portion of the ring gear;
A storage chamber which communicates with the inside of the case and stores the drive pinion gear bearing;
The drive pinion gear has a cover that covers the lower part of the storage chamber from the inside of the case, and stores the lubricating oil in the storage chamber at a position higher than the oil level of the lubricating oil stored in the case. And a drive pinion gear storage portion for immersing a lower portion of the bearing in the lubricating oil. In the vehicle transmission according to claim 1,
The lubricating oil is stored at a position higher than the oil surface of the lubricating oil stored in the case, and is provided near the ring gear bearing to immerse the lower portion of the ring gear bearing in the lubricating oil. What is claimed is: 1. A transmission for a vehicle, comprising: a storage unit for a ring gear.

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