JP2019127955A - Transmission case - Google Patents

Abstract

To provide a transmission case in which oil stain is suppressed, and seal performance of a seal member can be secured.SOLUTION: A transmission case 1 comprises: a bearing part 10; a flange 20 having a mating face 20a; a first fastening part 21 provided nearest to the bearing part 10; a second fastening part 22 which is provided while adjoining one side of the first fastening part 21; and a third fastening part 23 which is provided while adjoining the other side of the first fastening part 21. Seal members 40 are provided at the mating face 20a when the other member is superimposed thereon, and a thickness t1 of the seal member 40 arranged at the first fastening part 21 is thinner than a thickness t2 of the seal member 40 arranged at a first intermediate part 24 between the first fastening part 21 and the second fastening part 22, and at a second intermediate part 25 between the first fastening part 21 and the third fastening part 23. The transmission case also comprises a first rib 31 provided between the bearing part 10 and the first intermediate part 24, and a second rib 32 provided between the bearing part 10 and the second intermediate part 25.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a transmission case provided in a vehicle.

  Patent Document 1 discloses a transmission case in which a rib is provided only between a bearing portion and a fastening portion adjacent on the upper and lower sides with a fastening portion located closest to the bearing portion interposed therebetween.

Unexamined-Japanese-Patent No. 2017-125590

  In the transmission case disclosed in Patent Document 1, when other members are overlapped, the seal member is disposed on the mating surface including the fastening portion. At that time, immediately below the fastening portion, the thickness of the seal member is reduced by the tightening axial force of the bolt, and the fatigue strength of the seal member is reduced. Therefore, in the transmission case disclosed in Patent Document 1, since the thickness of the seal member around the fastening portion is small, when a load is applied to the fastening portion through the rib, oil stains easily occur.

  This invention is made in view of the above, Comprising: It aims at providing the transmission case which can control an oil stain and can secure seal nature of a sealing member.

  In order to solve the above-described problems and achieve the object, a transmission case according to the present invention includes a bearing portion, a flange having a mating surface on which other members are overlapped, and the bearing portion on the mating surface. On the other side of the first fastening portion provided closest to the other, the second fastening portion provided adjacent to one side of the first fastening portion in the mating surface, and the second fastening portion on the mating surface A transmission case including a third fastening portion provided adjacent thereto, a seal member is disposed on the mating surface when the other member is overlapped, and is disposed on the first fastening portion. The thickness t1 of the seal member is disposed at a first intermediate portion between the first fastening portion and the second fastening portion and at a second intermediate portion between the first fastening portion and the third fastening portion. Smaller than the thickness t2 of the sealing member, and the bearing portion A first rib provided between the first intermediate portion, characterized in that it and a second rib provided between said bearing portion and the second intermediate portion.

  As a result, the transmission case does not deteriorate the fatigue characteristics of the seal member by disposing the ribs at positions where the thickness of the seal member is large while distributing the load from the bearing portion by providing two ribs. The load can be transmitted to the position.

  According to the transmission case according to the present invention, oil stains can be suppressed, and the sealability of the seal member can be secured.

FIG. 1 is a plan view showing a part of the configuration of the transmission case according to the present embodiment. FIG. 2 is a plan view showing a part of the configuration of the transmission case according to the prior art.

  A transmission case according to an embodiment of the present invention will be described with reference to the drawings. In addition, this invention is not limited to the following embodiment. In addition, constituent elements in the following embodiments include those that can be easily replaced by persons skilled in the art or those that are substantially the same.

  A transmission case 1 according to an embodiment of the present invention will be described with reference to FIG. The transmission case 1 includes a bearing portion 10 and a flange 20.

  The bearing portion 10 is formed integrally with the vertical wall 11 of the transmission case 1 and has a shape protruding in a cylindrical shape from the surface of the vertical wall 11.

  The flange 20 has a mating surface 20a on which another member (for example, a transmission cover) is superimposed. The mating surface 20 a is formed as a flat surface over the entire surface, and is formed in a predetermined shape that constitutes the outer edge of the transmission case 1. The mating surface 20a is formed with a plurality of bolt holes 20b for bolting other members. And fastening parts are provided around the bolt holes 20b respectively. About the 1st fastening part 21, the 2nd fastening part 22, and the 3rd fastening part 23 which are three fastening parts provided in the circumference of bearing part 10 among a plurality of fastening parts provided in mating face 20a below explain.

  The first fastening portion 21 is provided closest to the bearing portion 10 on the mating surface 20a. The second fastening portion 22 is provided adjacent to one side of the first fastening portion 21 on the mating surface 20a. The third fastening portion 23 is provided adjacent to the other side of the first fastening portion 21 on the mating surface 20 a.

  The sealing member 40 is disposed on the mating surface 20a when other members are overlapped. That is, the seal member 40 is provided between the transmission case 1 and another member. The seal member 40 is made of, for example, a liquid gasket. In FIG. 1, only a part of the seal member 40 is illustrated.

  The thickness t1 of the first region 41 of the seal member 40 disposed on the first fastening portion 21 among the seal members 40 disposed on the mating surface 20a is between the first fastening portion 21 and the second fastening portion 22. The second region 42 of the seal member 40 disposed in the first intermediate portion 24 and the third region 43 of the seal member 40 disposed in the second intermediate portion 25 between the first fastening portion 21 and the third fastening portion 23 The thickness t2 is smaller than the thickness t2 (thickness t1 <thickness t2). That is, the thickness t1 of the first region 41 is reduced by the tightening axial force of a bolt (not shown) fastened to the first fastening portion 21 and the thickness t1 of the first region 41 is the thickness of the second region 42 and the third region It is thinner than t2 (thickness t1 <thickness t2).

  Here, in the conventional transmission case 101, as shown in FIG. 2, one rib 131 is linearly arranged between the bearing portion 10 and the first fastening portion 21. As shown in FIG. Therefore, the load of the bearing portion 10 is directly transmitted to the first fastening portion 21 along the rib 131. Further, the thickness t1 of the first region 41 of the seal member 40 provided in the first fastening portion 21 is smaller than the thickness t2 of the other second region 42 and the third region 43. In addition, since the assembly axial force acts on the first region 41 of the seal member 40 at the time of assembly with other members, the fatigue characteristics also deteriorate. Therefore, in the conventional configuration as shown in the figure, oil stains are likely to occur particularly in the first region 41 of the seal member 40.

  On the other hand, in the transmission case 1 according to the present embodiment, as shown in FIG. 1, no rib is provided between the bearing portion 10 and the first fastening portion 21. Instead, the bearing portion 10 and the first intermediate portion are provided. A first rib 31 is provided between the portion 24 and a second rib 32 is provided between the bearing portion 10 and the second intermediate portion 25.

  As described above, by arranging the two ribs (the first rib 31 and the second rib 32) so as to sandwich the first fastening portion 21, the load from the bearing portion 10 is applied to the first rib 31 and the second rib 32. And is transmitted to the flange 20 (the first intermediate portion 24 and the second intermediate portion 25). The thickness t2 of the second region 42 of the seal member 40 provided in the first intermediate portion 24 and the thickness t2 of the third region 43 of the seal member 40 provided in the second intermediate portion 25 are larger than the thickness t1 of the first region 41 . In addition, since the assembly axial force does not act on the second region 42 and the third region 43 of the seal member 40 at the time of assembly with other members, the fatigue characteristics are not deteriorated. Therefore, in the configuration as shown in the figure, oil stains are less likely to occur in each region of the seal member 40.

  In addition, it is preferable to comprise the 1st rib 31 and the 2nd rib 32 in the half thickness of the conventional rib 131 (refer FIG. 2). Thereby, the sealing performance of the seal member 40 can be ensured while securing the same mass and rigidity as the conventional one.

  According to the transmission case 1 having the above configuration, the thickness of the seal member 40 is increased while the load from the bearing portion 10 is dispersed by providing the two ribs (the first rib 31 and the second rib 32). By disposing the first rib 31 and the second rib 32 in the second region 42 and the third region 43 that are large positions, the load can be transmitted to a position where the fatigue characteristics of the seal member 40 are not deteriorated. The oil stain can be suppressed, and the sealability of the seal member 40 can be secured.

  The transmission case according to the present invention has been specifically described above by the embodiments for carrying out the invention. However, the gist of the present invention is not limited to these descriptions, and is based on the description of the scope of claims. Must be interpreted broadly. Further, it is needless to say that various changes, modifications and the like based on these descriptions are included in the spirit of the present invention.

  For example, in the transmission case 1 described above, two ribs (the first rib 31 and the second rib 32) are provided between the bearing portion 10 and the first intermediate portion 24 and the second intermediate portion 25. Three or more ribs may be provided between the portion 10 and the first intermediate portion 24 and the second intermediate portion 25.

1,101 transmission case 10 bearing portion 11 vertical wall 20 flange 20a mating surface 20b bolt hole 21 first fastening portion 22 second fastening portion 23 third fastening portion 24 first intermediate portion 25 second intermediate portion 31 first rib 32 Second rib 40 seal member 41 first region 42 second region 43 third region 131 rib

Claims (1)

A bearing portion, a flange having a mating surface on which other members are superimposed, a first fastening portion provided closest to the bearing portion at the mating surface, and one of the first fastening portions at the mating surface A transmission case comprising: a second fastening portion provided adjacent to a side; and a third fastening portion provided adjacent to the other side of the first fastening portion in the mating surface,
A seal member is disposed on the mating surface when the other member is overlaid,
The thickness t1 of the seal member disposed in the first fastening portion is the thickness of the first intermediate portion between the first fastening portion and the second fastening portion, the first fastening portion, and the third fastening portion. Smaller than the thickness t2 of the seal member disposed in the second intermediate portion between
A first rib provided between the bearing portion and the first intermediate portion;
A second rib provided between the bearing portion and the second intermediate portion;
A transmission case characterized by comprising:

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