JP2010236651A - Mounting structure of overflow tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent an oil pan from largely deforming with impact force caused by contact with foreign matter such as stone. <P>SOLUTION: An overflow tube 1 includes a tubular body 10 having an oil feed and discharge path 13 which penetrates a bottom 42 of the oil pan 40 of a transmission case 30 and extends from the bottom 42 of the oil pan 40 upward in a vertical direction, a communication hole 14 bringing the oil feed and discharge path 13 into communication with an inside space S of the oil pan 40, and a bolt 20 closing an opening in a lower part of the oil feed and discharge path 13 at the outside of the oil pan 40. A mounting structure of the overflow tube is constructed so that the body 10 is provided on the axis of a bolt 35 fixing a control valve body 50 to the transmission case 30 and an end 11 of the body 10 lying in the space S of the oil pan 40 contacts with the bolt 35. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an overflow tube mounting structure provided in an oil pan of a transmission case.

  An oil pan is attached to the lower part of the transmission case of the automatic transmission, and an overflow tube is provided on the oil pan (for example, Patent Document 1).

JP 2006-242365 A

FIG. 5 is a view for explaining an overflow tube mounting structure according to a conventional example represented by Patent Document 1. In FIG.
As shown in FIG. 5 (a), the overflow tube 100 blocks the opening at the lower end of the main body 101 provided through the oil pan 111 and the oil supply / discharge passage 103 formed in the main body 101. And a bolt 102.
In the overflow tube 100, when the oil level OL filled in the oil pan 111 exceeds the height of the supply / discharge port 104 at the tip of the main body 101, the oil exceeding the height is supplied to the supply / discharge port. The oil is discharged from the oil pan 111 to the outside of the oil pan 111 through the oil supply / discharge path 103, and the overflow tube 100 can be used to fill the oil pan 111 without impairing workability without impairing workability. 111 is used so that oil can be filled up to a predetermined height in 111.

  In the space S inside the oil pan 111 below the transmission case 110, built-in automatic transmissions such as a control valve body 112 and an oil strainer (not shown) are provided. The main body 101 is provided in a projecting manner in the space S inside the oil pan 111 while avoiding contact with these built-in objects.

In recent years, there is a tendency that the mounting position of the automatic transmission in the vehicle is shifted to the lower side (the ground side) of the vehicle in order to secure a space in the vehicle interior. However, since the oil pan 111 is exposed at the lower part of the vehicle, in order to avoid damage to the oil pan 111, it is necessary to secure a predetermined separation distance (ground height) from the ground surface.
For this reason, the height of the space S is narrowed by the amount the automatic transmission mounting position has shifted to the ground side, and the bottom surface 111a of the oil pan 111 and the control valve body 112 are brought close to each other. Is ensured.

  When the vehicle is traveling on a rough road such as an unpaved road, a foreign object such as a stone that is thrown up by a tire or an obstacle on the road surface comes into contact with the oil pan 111, and the oil pan 111 is shocked by the contact. It may be deformed by force and dent.

  For example, as shown in FIG. 5A, when an impact force acts in the direction indicated by arrow F in the figure, the oil pan 111 and the overflow tube 100 move to the control valve body 112 side, and FIG. As shown in FIG. 5B, the oil pan 111 may collide with electrical components such as a solenoid 113 and a harness (not shown) exposed on the surface of the control valve body 112 to damage them.

  Further, due to the deformation of the oil pan 111 due to the impact force, the height from the bottom surface 111a of the oil pan 111 to the supply / discharge port 104 of the overflow tube 100 is changed, for example, after the state shown in FIG. When the oil is filled, the oil level OL in the oil pan 111 cannot be adjusted to a predetermined height (see FIG. 5A), and the originally planned function as the overflow tube 100 is impaired. May be.

  Therefore, it is required to prevent the oil pan from being greatly deformed by an impact force caused by contact with a foreign object such as a stone.

  A cylindrical main body having an oil supply / discharge path extending vertically upward from the bottom of the oil pan, and the oil supply / discharge path and the inside of the oil pan are communicated with each other and provided through the oil pan of the transmission case. An overflow tube mounting structure comprising a communication hole and a lid member that closes the oil supply / discharge path outside the oil pan, and the tip of the main body located inside the oil pan is fixed to the transmission case It was set as the structure contact | abutted to the stationary side member.

According to the present invention, since the tip of the main body portion of the overflow tube is in contact with the stationary member fixed to the transmission case, even if the impact force due to contact with a foreign object acts on the oil pan, the impact force However, it is transmitted to the fixed side member via the main body portion and relaxed, and the main body portion functions as a support beam for the oil pan, thereby preventing the oil pan from being greatly deformed.
Therefore, it is possible to prevent the oil pan from being greatly deformed by the impact force caused by the contact with the foreign matter, and colliding with an electrical component such as a solenoid or a harness exposed on the surface of the control valve body to damage them.
Furthermore, since the position of the communication hole serving as the oil supply / discharge port does not change significantly, it is possible to prevent the originally intended function of the overflow tube from being impaired.

It is a figure explaining the attachment structure of the overflow tube concerning embodiment. It is a figure explaining the effect | action of the attachment structure of an overflow tube. It is a figure explaining the modification of the attachment structure of an overflow tube. It is a figure explaining the modification of the attachment structure of an overflow tube. It is a figure explaining the structure of the overflow tube concerning a prior art example.

Hereinafter, an embodiment of an overflow tube mounting structure will be described with reference to FIGS. 1 and 2.
In the overflow tube mounting structure according to the embodiment, the overflow tube 1 is provided in the oil pan 40 fixed to the transmission case 30 of the automatic transmission. It is used to adjust the amount (height) of oil injected into the pan 40.

  A control valve body 50 is located in the opening 31 at the bottom of the transmission case 30, and the control valve body 50 is fixed to a mounting portion 32 provided in the opening 31 with a bolt 35.

  The control valve body 50 includes valve bodies 51 and 51 in which oil passages are formed, and a separate plate 52 sandwiched between the valve bodies 51 and 51. These control valve bodies 50 are arranged in the thickness direction. The bolts 35 that pass therethrough are integrally assembled.

  A solenoid 53 and a harness (not shown) are provided on the side surface and the lower surface of the control valve body 50. For example, the solenoid 53 attached to the lower surface of the control valve body 50 is a space surrounded by an opening 31 of the transmission case 30 and an oil pan 40 provided so as to close the opening 31 from below the transmission case 30. In S, it protrudes to the oil pan 40 side, and the lower end 53 a of the solenoid 53 is located in the vicinity of the bottom 42 of the oil pan 40.

  The oil pan 40 has a hat shape in a cross-sectional view, and a peripheral flange portion 41 is fixed to an oil pan mounting portion 33 at the lower portion of the transmission case 30 with a bolt 34.

  The overflow tube 1 is provided so as to penetrate the bottom portion 42 of the oil pan 40 in the thickness direction, and includes the main body portion 10 and the bolt 20.

The main body portion 10 is a cylindrical member with a distal end portion 11 sealed, and an oil supply / discharge passage 13 is provided in the range from the distal end portion 11 side to the proximal end portion 12 along the axial direction. Is formed.
The main body portion 10 is provided along the vertical line VL. The main body portion 10 penetrates the main body portion 10 in the thickness direction on the distal end portion 11 side located in the space S, and the oil supply / discharge passage 13 and the oil pan 40 are connected to each other. One communication hole 14 communicating with the inside is provided (see FIG. 1B).

The communication hole 14 is provided at a position separated from the bottom 42 of the oil pan 40 by a predetermined distance h, and extends in a direction perpendicular to the vertical line VL.
The communication hole 14 defines the height of the oil injected into the oil pan 40, and the height h from the bottom 42 of the oil pan 40 to the communication hole 14 is the oil injected into the oil pan 40. The height (oil level) becomes OL.

  The base end portion 12 of the main body portion 10 located outside the oil pan 40 is provided with a flange portion 15 extending outward in the radial direction, and the flange portion 15 is a bottom portion of the oil pan 40. 42 is fixed by welding.

On the inner peripheral surface of the oil supply / discharge passage 13 on the base end portion 12 side, a thread groove 10 a is provided in a range from the base end portion 12 to the inside of the oil pan 40.
A bolt 20 is screwed into the thread groove 10a with a washer 21 interposed between the flange portion 15 and an opening at the lower end of the oil supply / discharge path 13 is formed by the bolt 20 functioning as a lid member. It is supposed to be blocked.

The front end 11 of the main body 10 is abutted against a bolt 35 that fixes the control valve body 50 to the transmission case 30 on the vertical line VL.
The front end surface 11a of the main body portion 10 is a flat surface, and is formed with a diameter larger than the head of the bolt 35 extending along the vertical line VL.

The effect | action of the attachment structure of the overflow tube 1 of this structure is demonstrated.
For example, when a foreign object comes into contact with the lower part of the oil pan 40 and an impact force acts in the direction indicated by the arrow F1 (the axial direction of the main body 10) in FIG. Thus, the impact force is transmitted to the control valve body 50 and the transmission case 30 via the main body 10 and the bolts 35, and is relaxed. It functions as a support beam and prevents the bottom portion 42 of the oil pan 40 from being greatly deformed in the vicinity of the overflow tube 1.

Also, when an impact force acts in the direction indicated by the arrow F2 in FIG. 2B, the main body 10 functions as a support beam and is located in the vicinity of the overflow tube 1 and in the vicinity of the solenoid 53. The bottom part 42 of the oil pan 40 is not greatly deformed.
Therefore, the collision between the deformed oil pan 40 and built-in objects such as the solenoid 53 is prevented, and damage to these built-in objects can be prevented.

Further, when oil is injected into the oil pan 40, as shown in FIG. 1 (a), the bolt 20 is removed from the main body 10 and supplied from an oil injection tool inserted into the oil supply / discharge passage 13. The oil is injected into the oil pan 40 through the communication hole 14. When the height of the injected oil is higher than the height h of the communication hole 14, the height of the communication hole 14 is exceeded. A minute amount of oil is discharged from the communication hole 14 into the oil supply / discharge passage 13 and discharged out of the oil pan 40.
The height h of the through hole from the bottom 42 of the oil pan 40 does not change greatly due to the impact force in any of the cases (a) and (b) of FIG. Since the oil can be filled up to a predetermined height h in the oil pan, the originally intended function as the overflow tube 1 is not impaired.

  Here, the bolt 20 in the embodiment corresponds to the lid member in the invention, and the control valve body 50 in the embodiment corresponds to the fixed side member in the invention.

As described above, in the present embodiment, the cylinder having the oil supply / discharge passage 13 that extends through the bottom 42 of the oil pan 40 of the transmission case 30 of the automatic transmission and extends vertically upward from the bottom 42 of the oil pan 40. A communication hole 14 that communicates the oil supply / discharge passage 13 and the space S inside the oil pan 40, a bolt 20 that closes the lower opening of the oil supply / discharge passage 13 outside the oil pan 40, The main body 10 is provided on the axis of the bolt 35 that fixes the control valve body 50 to the transmission case 30 and is located in the space S inside the oil pan 40. The front end portion 11 of the main body portion 10 is configured to abut on the bolt 35.
As a result, even if an impact force caused by contact with a foreign substance acts on the oil pan 40, the impact force is transmitted to the control valve body 50 side via the main body portion 10 and the bolt 35, and is relaxed. The portion 10 functions as a support beam, and the oil pan 40 is prevented from being greatly deformed.
Therefore, it is possible to prevent the oil pan 40 from being greatly deformed and colliding with electrical components such as a solenoid 53 and a harness (not shown) exposed on the surface of the control valve body 50 and damaging them.
Furthermore, the position of the communication hole 14 that becomes the oil supply / discharge port and determines the height of the oil in the oil pan 40 does not change greatly due to the impact force caused by the contact with the foreign matter. The function of the overflow tube can be prevented from being impaired.

3 and 4 are diagrams showing a modification of the overflow tube mounting structure.
In the overflow tube of the above-described embodiment, the case where the tip surface 11a of the main body portion 10 is a flat surface is exemplified. However, as shown in FIG. The recess 11b may be formed so that the recess 11b is fitted to the head of the bolt 35.
In this way, for example, even if an impact force acts in the direction indicated by the arrow F3 in FIG. 3A and a force is applied in the direction in which the overflow tube 1 is brought into contact with the solenoid 53, the movement of the main body 10 is performed. Since it is blocked by the recess 11b fitted to the head of the bolt 35, it is possible to suitably prevent the solenoid 53 from being damaged due to a collision.

Furthermore, the tip 11 of the overflow tube 1 may be provided in contact with the surface of the control valve body 50 on the oil pan 40 side instead of the bolt 35.
Also by doing so, it is possible to prevent the oil pan 40 from being greatly deformed and to prevent the originally planned oil height adjustment function of the overflow tube 1 from being impaired.
Moreover, since it is not necessary to provide the main-body part 10 on the axis line of the volt | bolt 35, the freedom degree of the layout of the overflow tube 1 improves. Thereby, by providing the overflow tube 1 in the vicinity of the portion where the strength of the oil pan 40 is the weakest, the deformation of the oil pan 40 can be more suitably prevented.

In the embodiment, the bolt 20 of the overflow tube 1 has a diameter substantially the same as that of the flange portion 15 of the main body portion 10. However, a bolt having a diameter larger than that of the flange portion 15 may be adopted. Further, in such a case, a bolt having a cap-shaped head portion having a large diameter as shown in FIG. 4 may be used.
In such a case, since the area of the bolt portion exposed at the lower portion of the oil pan 40 becomes large, foreign matters such as stones easily hit the bolt. By doing in this way, since the probability that the collision force by contact with a foreign substance will act on the bolt instead of the oil pan 40 side will increase, the possibility that the oil pan 40 will be deformed can be further reduced.

  In the embodiment, the opening at the lower end of the oil supply / discharge passage 13 is closed by the bolt 20 functioning as a lid member. However, as shown in FIG. An extension portion 16 is formed by extending outward in the axial direction from the portion 15 (on the lower side of the vehicle), and a cap member 22 that functions as a lid member is screwed into a screw groove 16a formed on the outer periphery of the extension portion 16. It may be fixed.

DESCRIPTION OF SYMBOLS 1 Overflow tube 10 Main body part 11 Front-end | tip part 12 Base end part 13 Oil supply / discharge path 14 Communication hole 15 Flange part 16 Extension part 20 Bolt 21 Washer 22 Cap member 30 Transmission case 31 Opening 32 Attachment part 33 Oil pan attachment part 34 Bolt 35 Bolt 40 Oil pan 41 Flange part 42 Bottom part 50 Control valve body 53 Solenoid

Claims (3)

A cylindrical main body portion provided through an oil pan of the transmission case and having an oil supply / discharge passage extending vertically upward from the bottom of the oil pan;
A communication hole communicating the oil supply / discharge path and the oil pan;
A cover member for closing the oil supply / discharge path outside the oil pan, and an overflow tube mounting structure comprising:
An overflow tube mounting structure, characterized in that the tip of the main body located inside the oil pan is brought into contact with a stationary member fixed to the transmission case.   2. The overflow tube attachment according to claim 1, wherein the main body is provided with a tip abutting on the bolt on an axis of a bolt that fixes the stationary member to the transmission case. Construction.   3. The overflow tube mounting structure according to claim 2, wherein a concave portion that fits into the bolt is formed at a tip of the main body portion.

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