JP6237165B2 - Transmission device - Google Patents

Description

  The present invention relates to a transmission device suitable for being applied to a vehicle such as an automobile, and more particularly to a transmission device including an overflow tube that prevents a predetermined amount or more of oil from being stored in an oil pan.

  Conventionally, for example, an automatic transmission mounted on a vehicle is injected with a predetermined amount of oil for lubrication and shift processing, maintained at a predetermined amount by an oil pan fixed to the bottom of the case, and replaced at a predetermined time Or discharged. An automatic transmission is known in which an overflow tube is provided in a through hole formed in an oil pan (see Patent Document 1).

  In the automatic transmission equipped with this overflow tube, when the oil is changed, the sealing member is removed, and when the oil level is higher than the opening of the overflow tube, the oil is discharged, so that an appropriate amount of oil is maintained. Will be. As a result, the oil amount can be optimized when the oil of the automatic transmission is changed.

JP 2010-255761 A

  However, in the automatic transmission of Patent Document 1, the opening of the overflow tube opens directly toward the internal structure such as the speed change mechanism, the valve body, the case inner wall, etc., located directly above the overflow tube. In some cases, the oil adhering to these internal structures may fall directly into the opening. In this way, when oil other than the oil stored in the oil pan enters the overflow tube, the operator who performs the oil change is out of the oil stored in the oil pan or other oil is flowing out. However, it was not possible to judge immediately, and it was necessary to look at the situation for a while, and the working time could be long.

  Therefore, an object of the present invention is to provide a transmission device that can reduce the oil replacement work time by suppressing the oil other than the oil stored in the oil pan from flowing into the overflow tube.

The transmission device (1) according to the present invention (see, for example, FIG. 1) includes a case (30) that houses the transmission mechanism (10),
An oil pan (40) disposed at a lower portion of the case (30), capable of storing the oil (2), and having a through hole (43) for discharging the oil (2);
The uppermost opening (61) is disposed upward from the through hole (43) and opens upward at the same height as the oil level (2a) set when the oil (2) is injected. an overflow tube (60) having a,
A sealing member (70) capable of sealing the through hole (43);
Between the transmission mechanism (10) and the opening (61), the opening (61) extends in a wider range than the opening (61) in the horizontal direction and covers the opening (61) from above , and the overflow tube (60). And a cover portion (80) provided above the opening (61) with a gap therebetween.

  In the transmission device (1) according to the present invention (see, for example, FIGS. 1 to 3), the cover portion (80) has an oil guide portion (81) extending downward from the opening (61) in the horizontal direction. ).

The transmission device (1) according to the present invention (see, for example, FIG. 1) includes a strainer (50) having a suction port (51) for sucking oil (2) stored in the oil pan (40),
The cover (80) is integrally formed with the strainer (50).

  In addition, although the code | symbol in the said parenthesis is for contrast with drawing, this is for convenience for making an understanding of invention easy, and has no influence on the structure of a claim. It is not a thing.

  According to the first aspect of the present invention, since the cover is provided between the transmission mechanism and the opening and covers the opening and is provided above the opening via a gap, for example, the transmission mechanism and the valve body Oil that has fallen from an internal structure located above the overflow tube, such as the inner wall of the case, is blocked by the cover portion and does not enter the overflow tube. As a result, oil other than the oil stored in the oil pan is prevented from flowing out of the overflow tube, so that it is possible to easily determine whether or not the oil stored in the oil pan is flowing out of the overflow tube at the time of oil replacement. It becomes like this. Therefore, compared with the case where oil other than the oil stored in the oil pan without the cover portion may flow out of the overflow tube, the oil replacement work time can be shortened.

  Here, the installation position of the overflow tube is conventionally set by giving a guideline from which part of the internal structure located above the overflow tube is likely to fall, based on confirmation tests and prediction based on experience. . On the other hand, according to the present invention, since the installation position of the overflow tube can be determined without worrying about oil falling, the degree of freedom in design can be improved.

  According to the second aspect of the present invention, since the cover portion includes the oil guide portion that extends downward from the opening in the horizontal direction, the oil adhered to the lower surface of the cover portion is guided by gravity. The portion is guided downwardly outside the opening in the horizontal direction. Thereby, since oil does not stagnate in the upper part of the opening on the lower surface of the cover part, it is possible to prevent the oil from falling into the overflow tube from the lower surface of the cover part.

  According to the third aspect of the present invention, the strainer having the suction port for sucking the oil stored in the oil pan is provided, and the cover portion is formed integrally with the strainer, so that the cover portion is separate from the strainer. Thus, the cost can be reduced by reducing the number of parts. Further, when assembling the transmission device, as compared with the case where the cover part is a separate body from the strainer, the work of assembling the cover part can be eliminated, so that the assembly time can be shortened.

Schematic which shows the transmission apparatus which concerns on embodiment of this invention. Schematic which shows the modification of the cover part of the transmission apparatus which concerns on embodiment of this invention. Schematic which shows the other modification of the cover part of the transmission apparatus which concerns on embodiment of this invention.

  Hereinafter, an embodiment according to the present invention will be described with reference to FIG.

  First, a schematic configuration of an automatic transmission 1 to which the transmission device of the present invention can be applied will be described with reference to FIG. In the present embodiment, the automatic transmission 1 is an FR (front engine / rear drive) type multi-stage transmission.

  The automatic transmission 1 according to the present embodiment includes a speed change mechanism (transmission mechanism) 10 having a planetary gear, a valve body 20 that causes the speed change mechanism 10 to perform a speed change operation, and a case that accommodates the speed change mechanism 10, the valve body 20, and the like. 30, and an oil pan 40 that can be stored in the lower portion of the case 30 and can store the working oil 2, and a strainer 50. An oil seal 41 is provided on the peripheral edge of the oil pan 40 over the entire periphery, and is oil-tight with the lower end 31 of the case 30. A predetermined amount of hydraulic oil (oil) 2 is stored in the oil pan 40 to a predetermined height. The height of the oil surface 2a of the working oil 2 is the height of an opening 61 of an overflow tube 60 described later.

  The strainer 50 includes a suction port 51 that sucks the working oil 2 stored in the oil pan 40, and the suction port 51 is installed toward the bottom 42 of the oil pan 40. A part of the oil pan 40 is formed with a through hole 43 for discharging the hydraulic oil 2. The strainer 50 is connected to an oil pump (not shown) and can suck the working oil 2 stored in the oil pan 40 by driving the oil pump. Further, the strainer 50 is made of, for example, a synthetic resin, and is configured such that an upper part 52 and a lower part 53 which are separate members are integrated with a filter (not shown).

  The automatic transmission 1 includes an overflow tube 60 disposed upward from the through hole 43 of the oil pan 40 and a drain plug (sealing member) 70 that can seal the through hole 43. The overflow tube 60 has a longitudinal direction in the vertical direction, and has an opening 61 that opens upward at the same height as the height of the oil surface 2 a set when the working oil 2 is injected. The overflow tube 60 is oil-tightly fixed to the peripheral edge of the through hole 43 by, for example, screwing. The drain plug 70 can be screwed into the overflow tube 60, and seals the overflow tube 60 by screwing and simultaneously seals the through hole 43.

  Further, the automatic transmission 1 includes a cover portion 80 that covers the opening 61 and is provided above the opening 61 with a gap between the transmission mechanism 10 and the opening 61. The cover 80 covers the upper portion of the opening 61 of the overflow tube 60 with a gap between the opening 61 and the cover. In the present embodiment, the cover portion 80 is integrally formed with the upper portion 52 of the strainer 50. That is, the upper portion 52 and the cover portion 80 are integrally formed by synthetic resin injection molding or the like.

  The cover portion 80 has a flat plate shape that extends in a wider range in the horizontal direction than the opening 61, and includes an oil guide portion 81 that extends downward on the outer peripheral portion. That is, the oil guide portion 81 is formed to extend downward from the opening 61 in the horizontal direction, and is positioned below the horizontal direction from the portion positioned above the opening 61. ing.

  The flow at the time of replacement | exchange of the working oil 2 in the automatic transmission 1 mentioned above is demonstrated.

  The working oil 2 injected from the upper part of the case 30 at the time of oil replacement is stored in the oil pan 40. At this time, when the drain plug 70 is removed by the operator, the working oil 2 flows out of the oil pan 40 from the opening 61 through the through hole 43, and the height of the oil surface 2 a of the working oil 2 is the height of the opening 61. Become height.

  Here, the oil droplet 2 b drops toward the opening 61 from the speed change mechanism 10, the valve body 20, the inner wall of the case 30, and the like that are located directly above the opening 61. On the other hand, by providing the cover portion 80, the oil droplet 2 b dripped toward the opening 61 is blocked by the cover portion 80 and flows to the outer peripheral side of the cover portion 80, and downward along the oil guide portion 81. (See the arrows in the figure). Thereby, the oil droplet 2 b dripped toward the opening 61 is prevented from entering the opening 61.

  As described above, according to the automatic transmission 1 of the present embodiment, the cover portion 80 is provided between the transmission mechanism 10 and the opening 61 so as to cover the opening 61 and to be provided above the opening 61 via a gap. For example, oil that has dropped from internal structures located above the overflow tube 60 such as the transmission mechanism 10, the valve body 20, and the inner wall of the case 30 is blocked by the cover 80 and enters the overflow tube 60. There is nothing. As a result, oil droplets 2b other than the working oil 2 stored in the oil pan 40 are prevented from flowing out of the overflow tube 60, so that the working oil 2 stored in the oil pan 40 is removed from the overflow tube 60 during oil replacement. It becomes possible to easily determine whether or not it has been leaked. Therefore, compared with the case where oil droplets 2b other than the working oil 2 stored in the oil pan 40 without the cover portion 80 may flow out of the overflow tube 60, the oil replacement work time can be shortened. .

  Further, according to the automatic transmission 1 of the present embodiment, when setting the installation position of the overflow tube 60, the installation position of the overflow tube 60 can be determined without worrying about the falling of the working oil 2. , Design freedom can be improved.

  Further, according to the automatic transmission 1 of the present embodiment, the cover portion 80 includes the oil guide portion 81 that extends downward from the opening 61 in the horizontal direction, and therefore adheres to the lower surface of the cover portion 80. The oil thus guided is guided downward by the oil guide part 81 in the horizontal direction by gravity. Thereby, since the working oil 2 does not stagnate in the upper part of the opening 61 on the lower surface of the cover part 80, the working oil 2 can be prevented from dropping into the overflow tube 60 from the lower surface of the cover part 80.

  Further, according to the automatic transmission 1 of the present embodiment, the strainer 50 having the suction port 51 for sucking the working oil 2 stored in the oil pan 40 is provided, and the cover portion 80 is integrally formed with the strainer 50. The cost can be reduced by reducing the number of parts as compared with the case where the part 80 is separate from the strainer 50. Further, when the automatic transmission 1 is assembled, the operation of assembling the cover unit 80 can be made unnecessary as compared with the case where the cover unit 80 is separate from the strainer 50, so that the assembly time can be shortened.

  In the above-described embodiment, the cover portion 80 has a flat plate shape that extends in a wider range in the horizontal direction than the opening 61, but is not limited thereto. For example, as shown in FIG. 2, the cover portion 180 may have a flat plate shape that extends over a wide range in a direction inclined with respect to the horizontal rather than the opening 61. In this case, the lowermost edge portion of the cover portion 180 constitutes the oil guide portion 181. Further, for example, as shown in FIG. 3, the cover part 280 may have a substantially spherical shape with the upper part of the opening 61 as the highest part. In this case, the edge part of the cover part 280 constitutes the oil guide part 281. In any case, since the cover parts 180 and 280 are provided with oil guide parts 181 and 281 that are located downward on the outer side in the horizontal direction from the part located above the opening 61, The attached oil is guided downward from the upper side of the opening 61 in the horizontal direction by the oil guide portions 181 and 281 by gravity.

  Further, in the present embodiment described above, the cover portion 80 includes the oil guide portion 81, but is not limited thereto, and the oil guide portion 81 may not be provided.

  Further, in the above-described embodiment, the case where the cover portion 80 is integrally formed with the strainer 50 has been described. However, the present invention is not limited to this, and the cover portion 80 and the strainer 50 are separate, for example, screwed or the like. You may make it fix by. Or you may make it fix the cover part 80 to fixing members, such as the overflow tube 60 and the oil pan 40. FIG. Also in these cases, it is possible to easily determine whether or not the working oil 2 stored in the oil pan 40 is flowing out of the overflow tube 60 at the time of oil replacement.

  Further, in the above-described embodiment, the case where the transmission device is the FR type automatic transmission 1 has been described. However, the present invention is not limited to this, and the transmission device generally includes an oil pan at the lower portion of the case. Can be applied.

1 Automatic transmission (transmission device)
2 Working oil (oil)
2a Oil level 10 Transmission mechanism (transmission mechanism)
30 Case 40 Oil pan 42 Bottom 43 Through hole 50 Strainer 51 Suction port 60 Overflow tube 61 Opening 70 Drain plug (sealing member)
80 Cover part 81 Oil guide part 180 Cover part 181 Oil guide part 280 Cover part 281 Oil guide part

Claims (3)

A case for accommodating the transmission mechanism;
An oil pan disposed at a lower portion of the case, capable of storing oil, and having a through hole for discharging the oil;
An overflow tube that is disposed upward from the through hole and has an opening at the top at the same height as the oil level that is set when oil is injected,
A sealing member capable of sealing the through hole;
Between the transmission mechanism and the opening, it extends in a wider range than the opening in the horizontal direction and covers the opening entirely from above , and is made of a separate member from the overflow tube, with a gap above the opening. A cover portion provided via,
A transmission device characterized by that. The cover portion includes an oil guide portion extending downward from the opening outward in the horizontal direction.
The transmission device according to claim 1. A strainer having a suction port for sucking oil stored in the oil pan;
The cover part is integrally formed with the strainer.
The transmission device according to claim 1 or 2, wherein

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