JP6532326B2 - Oil passage connection structure - Google Patents

Description

  The present invention relates to an oil path connection structure in a transmission for a vehicle or the like.

As a structure which connects the oil path formed in two parts mutually spaced apart, Unexamined-Japanese-Patent No. 62-106178 is disclosing the technique using the connecting pipe provided with the insertion block in the both ends.
The O-ring is held in the ring groove formed on the outer peripheral surface of the insertion block, and the O-ring is the groove bottom of the ring groove and the inner wall of the oil passage opening by inserting the insertion block into the oil passage opening of each part And compression between them and prevent oil leakage.
In this structure, the outer diameter of the fitting block that forms the seal portion becomes extremely large compared to the inner diameter of the connecting pipe, which is a substantial oil passage diameter.
On the other hand, for example, in an automatic transmission for a vehicle, a control valve is accommodated in a transmission case, and an oil passage of the control valve and an oil passage formed in a wall of the transmission case (hereinafter, case wall) In connection, when directly mounting and fixing the control valve and the transmission case, oil leakage is sealed at the mating surfaces of the two.

Japanese Patent Application Laid-Open No. 62-106178

FIG. 3 shows a seal structure using an oil path connection O-ring on the mating surface of the control valve and the transmission case. (A) shows each member spaced apart, and (b) shows a coupled state.
That is, the large diameter portion 5 'accommodating the O-ring 30 of the elastic material is cut and formed in the oil passage opening in the mating surface 3 of the case wall 2', and pressure is applied between the bottom wall and the mating surface 11 of the control valve 10. Seal.
The inner diameter of the O ring 30 is set larger than the diameter of the oil passage 4 and the large diameter portion 5 'is set larger than the outer diameter of the O ring 30 so that the O ring 30 compressed by pressure does not narrow the oil passage diameter. .
Here, since the oil passage 12 of the control valve 10 and the oil passage 4 of the case wall 2 'are directly connected, it is not necessary to provide a connecting pipe having a fitting block in which the outer diameter is extremely large with respect to the substantial oil passage diameter. Become.

  However, since the transmission case 1 'and the control valve 10 are manufactured by casting, there is a possibility that the edge of the O-ring 30 may be cut by the edge of the O-ring 30 when the cavity exists in the installation surface of the O-ring 30. is there. When this so-called ring breakage occurs, the seal becomes invalid.

  Therefore, in view of the above problems, in the connection structure in which the oil paths of the two parts are connected by the mating surfaces of the two parts, the present invention can obtain a reliable seal without being affected even if there are cavities in the parts. The purpose is to provide a connection structure.

For this reason, the present invention relates to an oil passage connection structure of a mating surface in which an oil passage is formed across two parts,
The oil passage connection portion of both parts has a large diameter portion which opens at the mating surface and forms a stepped portion at the far end,
A metal sleeve having a radially bulging portion is fitted to the large diameter portion of both parts;
The sleeve has an axial length longer than a distance between one of the stepped portions and the other stepped portion in a state in which the two components abut on the mating surface.
The two parts abut and join at the mating surface,
When the sleeve is pressed in the axial direction between the one step portion and the other step portion, the bulging portion extends in the radial direction and is plastically deformed to be in close contact with the inner wall of the large diameter portion ,
The bulging portion of the sleeve is set in two or more places in the axial direction at a position where the bulging portion of the sleeve is contained in the large diameter portion of one of the two parts and a position where the bulging portion is contained in the other large diameter portion .

  According to the present invention, since the metal sleeve is used instead of the O-ring, oil leakage is sealed without the possibility of cutting by the cavity.

It is a figure which shows embodiment. It is explanatory drawing which shows the process of sleeve assembly. It is a figure which shows a prior art example.

Hereinafter, embodiments of the present invention will be described.
In the embodiment, the present invention is applied to an oil passage connection structure in a joint surface where an oil passage is formed across a transmission case and a control valve of an automatic transmission for a vehicle, and a sleeve is used instead of the O-ring.
FIG. 1 shows the embodiment, (a) is a sectional view showing the case wall of the transmission case at the connecting portion and the oil passage shape of the control valve, and (b) is a sectional view of the sleeve. (A) shows the case wall and the control valve spaced apart.
First, as shown in (a), the oil passage 4 formed on the case wall 2 of the transmission case 1 and the oil passage 12 formed on the control valve 10 have the same inner diameter d1 and the facing each other is aligned The large diameter portions 5 and 13 are provided at the opening of the face F (3, 11), respectively.
The inner diameter of the large diameter portions 5 and 13 is d2, and the depth from the mating surface F is h.

The sleeve 20 is made of thin metal and, as shown in FIG. 1B, has bulging portions 22 (22a, 22b) whose diameters are increased by bulge processing in the upper half and lower half in the axial direction.
In the single-piece state before assembly, the sleeve 20 has an inner diameter v2 and an outer diameter w2 of the bulging portion 22 and an inner diameter v1 of the material between both ends and the bulging portions 22a and 22b (hereinafter referred to as a basic inner diameter) It has a vertically symmetrical shape except for the diameter w1 (hereinafter referred to as the basic outer diameter).
The basic outer diameter w1 of the sleeve 20 is larger than the inner diameter d1 of the oil passages 4 and 12 of the case wall 2 and the control valve 10, and the basic inner diameter v1 is set to the same value as the inner diameter d1.
Further, the outer diameter w2 of the bulging portion 22 has a predetermined minute gap with respect to the inner diameter d2 of the large diameter portions 5 and 13 at the opening of the oil passages 4 and 12 and is inserted into the large diameter portions 5 and 13 and fitted. It is possible to
The outer diameter w2 of the bulging portion 22 in the sleeve 20 may be slightly larger than the basic outer diameter w1, so the inner diameter d2 of the large diameter portions 5 and 13 of the oil passages 4 and 12 may also be small.
The total length s of the sleeve 20 is set to be longer than the total 2h of the depths of the large diameter portions 5 and 13 by a predetermined amount.

The sleeve 20 is assembled across both the large diameter portion 5 of the case wall 2 and the large diameter portion 13 of the control valve 10.
FIG. 2 is an explanatory view showing a process of assembly.
First, as shown in (a), the sleeve 20 is inserted from one end into the large diameter portion 13 of the control valve 10 which is set in a jig (not shown) and the mating surface 11 is positioned upward.
When the lower end (one end inserted) of the sleeve 20 is seated on the step 14 at the rear end of the large diameter portion 13 of the control valve 10, the upper half of the sleeve 20 protrudes upward from the mating surface 11. In this state, the entire bulging portion 22 b of the lower half portion is accommodated in the large diameter portion 13 in the axial direction.

Next, as shown in (b) of FIG. 2, the transmission case 1 is lowered with the mating surface 3 facing downward and the large diameter portion 5 is lowered in axial alignment with the large diameter portion 13 of the control valve 10. In a state where the projecting portion (upper half) of 20 relatively enters the large diameter portion 5 of the case wall 2 and the upper end of the sleeve 20 abuts on the step portion 6 at the far end of the large diameter portion 5 of the case wall 2 Through. The entire bulging portion 22 a is accommodated in the large diameter portion 5 in the axial direction.
In this state, since the total length of the sleeve 20 is longer than the sum of the depths of the large diameter portions 5 and 13, a gap remains between the mating surfaces 3 and 11.
Thereafter, when the transmission case 1 is further lowered, the mating surface 3 of the case wall 2 and the mating surface 11 of the control valve 10 abut each other. For example, by tightening the bolt from the transmission case 1 side The transmission case 1 and the control valve 10 are coupled.
The sleeve 20 is compressed in the axial direction by pressing during the descent from the state where the upper end of the sleeve 20 abuts on the step portion 6 until the mating surfaces 3 and 11 abut, so an arrow shown in FIG. As shown in the drawing, the bulging portion 22 is expanded radially outward by plastic deformation and is in close contact with the inner walls of the large diameter portions 5 and 13.

  In this assembling, since the basic outer diameter w1 of the axial end of the sleeve 20 is smaller than the outer diameter w2 of the bulging portion 22 and hence smaller than the inner diameter d2 of the large diameter portions 5 and 13, the large diameter portion of the control valve 10 is Insertion of the sleeve 20 into the housing 13 is easy, and it is also easy to axially align the large diameter portion 5 of the transmission case 1 (case wall 2) with the sleeve 20 projected from the mating surface 11 of the control valve 10 is there.

As a result, the bulging portion 22 (22a, 22b) of the sleeve 20 bulges outward in the radial direction by axial compression due to pressure and adheres closely to the inner walls of the large diameter portions 5 and 13. Be done.
And since the sleeve 20 is metal even if the large diameter part 5 or 13 has a void, there is no fear of a cutting like an O-ring.
Further, even when an opening occurs in the mating face F of the transmission case 1 and the control valve 10 to create an axial gap, the sleeve 20 is in close radial contact with the inner walls of the large diameter portions 5 and 13 , Not affected by the seal.

  Since the basic inner diameter v1 of the sleeve 20 is the same as the inner diameter d1 of the oil passages 4 and 12 of the transmission case 1 and the control valve 10, the passage is not narrowed by the sleeve 20 and the oil flow is not blocked.

Also, in the conventional example using the O-ring, the large diameter portion 5 'has allowances in both the inner diameter direction and the outer diameter direction of the O-ring 30 so that the compressed O-ring 30 does not narrow the oil passage diameter. While the wall thickness of the case wall 2 'must be increased as shown in FIG. 3, the thickness of the sleeve 20 is thin, and the bulging portion 22 is expanded. Since the degree of extension is also small, as shown in FIGS. 1 and 2, the wall thickness of the case wall 2 forming the oil passage 4 of the transmission case 1 can be small, and weight reduction can be achieved.
Although the control valve 10 is illustrated in a block shape, when the formation portion of the oil passage 12 is a wall shape, the wall thickness is also reduced as in the case wall 2 of the transmission case 1.

  In the present embodiment, the transmission case 1 and the control valve 10 correspond to two parts in the invention.

  The embodiment is configured as described above, and connects the oil passages 4 and 12 of the mating face F (3, 11) where the oil passage is formed across the transmission case 1 (the case wall 2 thereof) and the control valve 10. In the oil passage connecting structure, the oil passages 4 and 12 connecting parts of both parts are respectively opened at the mating surfaces 3 and 11 and have large diameter portions 5 and 13 forming the stepped portions 6 and 14 at the far end, A metal sleeve 20 having a radially bulging portion 22 is fitted to the large diameter portions 5 and 13 of both parts, and the sleeve 20 is one step portion 6 in a state where both parts abut on the mating surface F The sleeve 20 has an overall length s (axial length) longer than the distance between the other step portion 14 and the sleeve 20 and the one step portion 6 by abutting and joining at the mating surface F. When the other step 14 is pressed in the axial direction, the bulging portion 22 is in the radial direction. The extended plastic deformation results in close contact with the inner walls of the large diameter parts 5 and 13. Therefore, there is no possibility of cutting due to a cavity, so it is sealed against oil leakage, and the case wall 2 etc. The wall thickness can also be reduced.

  Then, the bulging portion 22 of the sleeve 20 is divided into two axial directions (22a, 22b) of a position to be accommodated in the large diameter portion 5 of the transmission case 1 and a position to be accommodated in the large diameter portion 13 of the control valve 10. Therefore, even if there is an axial offset between the two large diameter portions 5 and 13, plastic deformation in close contact with the inner wall of the corresponding large diameter portion is facilitated.

  In addition, although the bulging part 22 of the sleeve 20 can be made into one bulging part which straddles the transmission case 1 and the control valve 10, as in the embodiment, the transmission case 1 side and the control valve 10 side It is more preferable to set two points corresponding to the above in that it is easily intimately deformed in a smooth manner even in the case of an axial deviation.

Also, although the basic inner diameter v1 of the sleeve 20 is the same as the inner diameter d1 of the oil passages 4 and 12 of the transmission case 1 and the control valve 10, they are different from each other as long as the oil flow requirement is satisfied. For example, the diameter may be smaller than the inner diameter d1 of the oil passages 4 and 12.
Furthermore, although the oil passages 4 and 12 of the transmission case 1 and the control valve 10 have been described as having the same inner diameter d1, they may be different from each other, and in relation to the sleeve 20, both ends of the sleeve 20 are the transmission case 1 and control It is only necessary to be able to be locked in each of the step portions 6 and 14 of the valve 10 to press in the axial direction.

  Although the embodiment has been described taking the connection of the transmission case of the automatic transmission for the vehicle and the oil passage in the control valve as an example, the present invention is not limited to this, and various two parts connected in the mating surface It is applicable to oil passage connection.

REFERENCE SIGNS LIST 1 transmission case 2 case wall 3, 11 mating surface 4, 12 oil passage 5, 13 large diameter portion 6, 14 step portion 10 control valve 20 sleeve 22, 22 a, 22 b bulging portion

Claims (1)

In an oil passage connection structure of a mating surface in which an oil passage is formed across two parts,
The oil passage connection portion of both parts has a large diameter portion which opens at the mating surface and forms a stepped portion at the far end,
A metal sleeve having a radially bulging portion is fitted to the large diameter portion of both parts;
The sleeve has an axial length longer than a distance between one of the stepped portions and the other stepped portion in a state in which the two components abut on the mating surface.
The two parts abut and join at the mating surface,
When the sleeve is pressed in the axial direction between the one step portion and the other step portion, the bulging portion extends in the radial direction and is plastically deformed to be in close contact with the inner wall of the large diameter portion ,
The bulging portion of the sleeve is set in two or more places in the axial direction at a position where the bulging portion of the sleeve is contained in the large diameter portion of one of the two parts and a position where the bulging portion is contained in the other. Oil passage connection structure.

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