JP2017020582A - Oil passage connecting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a proper seal without being influenced by a blowhole even if the blowhole exists at a connecting part, in a connecting structure of an oil passage of a transmission case and an oil passage of a control valve which are connected to each other at mating faces.SOLUTION: An oil passage 4 which is formed at a case wall 2 of a transmission case 1 and an oil passage 12 which is formed at a control valve 10 are opened at mating faces F (3, 11), respectively, large-diameter parts 5, 13 forming step parts 6, 14 are formed at a depth end, a metal-made sleeve 20 having swollen parts 22a, 22b is inserted into the large-diameter parts 5, 13, the sleeve 20 is pressed to an axial direction between the step parts 6, 14 by the coupling of the case wall 2 and the control valve 10, and the swollen parts 22 are elastically deformed to a radial direction, and closely adhere to inner walls of the large-diameter parts 5, 13. Since the sleeve 20 is made of metal, there is no possibility of cutting by a blowhole, and the sleeve is surely sealed from oil leakage.SELECTED DRAWING: Figure 2

Description

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

As a structure for connecting oil passages formed in two parts that are spaced apart from each other, Japanese Patent Application Laid-Open No. 62-106178 discloses a technique that uses a connecting pipe having fitting blocks at both ends.
The insertion block holds an O-ring in a ring groove formed on the outer peripheral surface thereof. By inserting the insertion block into the oil passage opening of each component, the O-ring becomes the groove bottom of the ring groove and the inner wall of the oil passage opening. And the oil is prevented from leaking.
In this structure, the outer diameter of the fitting block that forms the seal portion is extremely large compared to the inner diameter of the connection 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 path of the control valve and an oil path formed in a wall (hereinafter referred to as a case wall) of the transmission case. Regarding the connection, when the control valve and the transmission case are directly attached and fixed, sealing against oil leakage is performed on the mating surfaces of the two.

Japanese Patent 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 separated, and (b) shows a coupled state.
That is, a large-diameter portion 5 ′ accommodating an O-ring 30 made of an elastic material is cut and formed in an oil passage opening in the mating surface 3 of the case wall 2 ′ and pressed between the bottom wall and the mating surface 11 of the control valve 10. And seal.
The inner diameter of the O-ring 30 is set larger than the diameter of the oil path 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 pressing does not narrow the oil path 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, there is no need for a connecting pipe having a fitting insertion block whose 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, if there is a cast hole on the installation surface of the O-ring 30, the O-ring 30 may be cut by the edge of the cast hole. is there. When this so-called ring break occurs, the seal becomes invalid.

  Therefore, in view of the above-described problems, the present invention provides a reliable seal without being affected by a cast hole in a component in a connection structure in which oil passages of two components are connected by a mating surface of both components. An object is to provide a connection structure.

  For this reason, in the oil passage connection structure of the present invention, the oil passage connection portions of both parts each have a large-diameter portion that opens at the mating surface and forms a stepped portion at the back end, and has a bulging portion in the radial direction. The metal sleeve is fitted to the large diameter part of both parts, and the sleeve is axially longer than the distance between one step part and the other step part when both parts are in contact with the mating surface. When the sleeve is pressed in the axial direction between one stepped portion and the other stepped portion, the bulging portion extends in the radial direction. It was assumed that it was plastically deformed and adhered to the inner wall of the large diameter portion.

  According to the present invention, since a metal sleeve is used instead of the O-ring, it is sealed against oil leakage without the possibility of being cut by the cast hole.

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

Embodiments of the present invention will be described below.
In the embodiment, the present invention is applied to an oil passage connection structure on a mating 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 an O-ring.
1A and 1B show an embodiment, in which FIG. 1A is a cross-sectional view showing a case wall of a transmission case and an oil passage shape of a control valve in a connecting portion, and FIG. (A) shows the case wall and the control valve apart.
First, as shown in (a), the oil passage 4 formed in the case wall 2 of the transmission case 1 and the oil passage 12 formed in the control valve 10 have the same inner diameter d1 and are opposed to each other. Large diameter portions 5 and 13 are provided in the openings of the surface F (3 and 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.

As shown in FIG. 1B, the sleeve 20 has bulging portions 22 (22a, 22b) whose diameters are increased by bulging in the upper half and the lower half in the axial direction.
In the single product state before assembly, the sleeve 20 has an bulging portion 22 with an inner diameter v2 and an outer diameter w2, and an inner diameter v1 (hereinafter referred to as a basic inner diameter) of the material between both ends and the bulging portions 22a and 22b. It has a vertically symmetrical shape, leaving 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 in the openings of the oil passages 4 and 12, and is inserted into the large diameter portions 5 and 13 and fitted. Is possible.
The outer diameter w2 of the bulging portion 22 in the sleeve 20 only needs to be slightly larger than the basic outer diameter w1, and therefore the inner diameter d2 of the large diameter portions 5 and 13 of the oil passages 4 and 12 may be small.
The total length s of the sleeve 20 is set longer than the total depth 2h 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 diagram showing the assembly process.
First, as shown in (a), the sleeve 20 is inserted from one end into the large-diameter portion 13 of the control valve 10 set on a jig (not shown) and positioned with the mating surface 11 facing upward.
When the lower end (inserted one end) of the sleeve 20 is seated on the stepped portion 14 at the rear end of the large diameter portion 13 of the control valve 10, the upper half portion of the sleeve 20 protrudes upward from the mating surface 11. In this state, the bulging portion 22b in the lower half is entirely within the large diameter portion 13 in the axial direction.

Next, the transmission case 1 is lowered with the mating surface 3 facing downward and the large-diameter portion 5 is lowered to the large-diameter portion 13 of the control valve 10 in an axially aligned state, as shown in FIG. The protruding portion (upper half portion) 20 relatively enters the large-diameter portion 5 of the case wall 2 so that the upper end of the sleeve 20 contacts the stepped portion 6 at the back end of the large-diameter portion 5 in the case wall 2. It reaches. The bulging portion 22 a is entirely within the large diameter portion 5 in the axial direction.
In this state, the total length of the sleeve 20 is longer than the total depth of the large diameter portions 5 and 13, so that 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 come into contact with each other. The transmission case 1 and the control valve 10 are coupled.
Since the sleeve 20 is compressed in the axial direction by pressing while the upper end of the sleeve 20 is in contact with the stepped portion 6 until the mating surfaces 3 and 11 contact, the arrow 20 in FIG. As shown in the figure, the bulging portion 22 bulges outward in the radial direction by plastic deformation and adheres closely to the inner walls of the large diameter portions 5 and 13.

  In this assembly, since the basic outer diameter w1 of the shaft end of the sleeve 20 is smaller than the outer diameter w2 of the bulging portion 22, and therefore smaller than the inner diameter d2 of the large diameter portions 5 and 13, the large diameter portion of the control valve 10 is used. 13 is easy to insert, and it is also easy to align the large diameter portion 5 of the transmission case 1 (case wall 2) with the sleeve 20 protruding 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 due to axial compression by pressing, and comes into close contact with the inner walls of the large diameter portions 5, 13, so that oil leakage at the connecting portion is sealed. Is done.
And even if there is a cast hole in the large diameter portions 5 and 13, the sleeve 20 is made of metal, so there is no risk of breakage in the O-ring.
Even when the mating surface F of the transmission case 1 and the control valve 10 is opened to create an axial gap, the sleeve 20 is in close contact with the inner walls of the large diameter portions 5 and 13 in the radial direction. 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 of the oil is not obstructed by the sleeve 20 and the flow of oil is not obstructed.

Further, in the conventional example using the O-ring, the large-diameter portion 5 ′ has a margin 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. 3, the wall thickness of the case wall 2 ′ must be large as shown in FIG. 3, whereas the wall thickness of the sleeve 20 is thin and the swelling of the bulging portion 22 is large. Since the degree of protrusion is 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 the weight can be reduced.
Although the control valve 10 is illustrated in a block shape, when the oil passage 12 is formed in a wall shape, the wall thickness is 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 surface F (3, 11) where the oil passage is formed across the transmission case 1 (the case wall 2) and the control valve 10. In the oil passage connection structure, the oil passages 4 and 12 connecting parts of both parts have large diameter portions 5 and 13 that open at the mating surfaces 3 and 11 and form stepped portions 6 and 14 at the back ends, A metal sleeve 20 having a bulging portion 22 in the radial direction is fitted into the large diameter portions 5 and 13 of both parts, and the sleeve 20 has one stepped portion 6 in a state in which both parts abut on the mating surface F. And the other stepped portion 14 has a total length s (length in the axial direction) that is longer than the distance between the two stepped portions 14, and the two parts come into contact with each other at the mating surface F so that the sleeve 20 is connected to the one stepped portion 6. When pressed in the axial direction between the other stepped portions 14, the bulging portion 22 is in the radial direction. Since it is extended and plastically deformed so as to be in close contact with the inner walls of the large-diameter portions 5 and 13, the case wall 2 and the like that are sealed against oil leakage without the possibility of being cut by the cast hole, and that also form the oil passage 4 and the like The wall thickness can be reduced.

  The bulging portion 22 of the sleeve 20 is divided into two axial locations (22a, 22b), a position that fits in the large diameter portion 5 of the transmission case 1 and a position that fits in the large diameter portion 13 of the control valve 10. Therefore, even if there is an axial misalignment between the large diameter portions 5 and 13, plastic deformation that adheres closely to the corresponding inner wall of the large diameter portion becomes easy.

  The bulging portion 22 of the sleeve 20 may be a single bulging portion that spans the transmission case 1 and the control valve 10, but as in the embodiment, the bulging portion 22 and the control valve 10 side It is more preferable to use two locations corresponding to the above in terms of being easy to smoothly adhere and deform even with respect to an axial deviation.

Further, 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, but they are different from each other as long as the requirements for the oil flow are satisfied. For example, the diameter may be smaller than the inner diameter d1 of the oil passages 4 and 12.
Further, 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, but they may be different from each other, and both ends of the sleeve 20 are connected to the transmission case 1 and the control in relation to the sleeve 20. What is necessary is just to be able to press on the level direction part 6 and 14 of the valve | bulb 10, and to press to an axial direction.

  The embodiment has been described by way of example of connection of the oil passage in the transmission case of the automatic transmission for a vehicle and the control valve. However, the present invention is not limited to this, and various two parts connected at the mating surface Applicable to oil passage connection.

DESCRIPTION OF SYMBOLS 1 Transmission case 2 Case wall 3, 11 Mating surface 4, 12 Oil path 5, 13 Large diameter part 6, 14 Step part 10 Control valve 20 Sleeve 22, 22a, 22b Bulging part

Claims (2)

In the oil channel connection structure of the mating surface where the oil channel is formed across the two parts,
The oil passage connecting portions of both parts each have a large diameter portion that opens at the mating surface and forms a step portion at the back end,
A metal sleeve having a bulging portion in the radial direction is fitted to the large diameter portion of both parts,
The sleeve has an axial length that is longer than a distance between one of the stepped portions and the other stepped portion in a state in which the parts are in contact with the mating surface,
By abutting and joining the two parts at the mating surface,
When the sleeve is pressed in the axial direction between the one stepped portion and the other stepped 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. An oil passage connection structure characterized by that.   The bulge portion of the sleeve is set at two or more locations in the axial direction at a position where the bulge portion is accommodated in the large diameter portion in one of the two parts and a position where the bulge portion is accommodated in the large diameter portion on the other. The oil passage connection structure according to claim 1.

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