JP3557080B2 - Automatic transmission with electronic control unit - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an automatic transmission with an electronic control unit.
[0002]
[Prior art]
As a conventional automatic transmission with an electronic control unit, there is one disclosed in Japanese Patent Application Laid-Open No. 2-3740 and one disclosed in Japanese Patent Application Laid-Open No. 9-53706.
Japanese Unexamined Patent Publication No. 2-3740 discloses an automatic transmission in which a recess is formed in a part of an outer wall of an extension housing 10, and the open side of the recess is covered with a cover 14 having fins 22 and hermetically sealed. An electronic control unit (particularly, an automatic transmission unit is abbreviated as an ATCU) 24 is mounted in the chamber 18 and the fin 22 dissipates heat from the ATCU 24 through the cover 14 and the chamber 18. It is configured to cool.
Further, Japanese Unexamined Patent Publication No. 9-53706 discloses a closed space in which a recess is formed in a part of an outer wall of a casing 11 of an automatic transmission, and an open side of the recess is covered with a cover 30 to form a closed space. The board 32 of the electronic control unit (ATCU) E is mounted in the enclosed space, and the rotating member R in the mechanism arranged in the casing 11 sends air to the radiating fins 13 of the electronic control unit mounting portion, and the air is blown through the mounting portion. It is configured to radiate and cool the substrate 32.
[0003]
[Problems to be solved by the invention]
However, the conventional automatic transmission with an electronic control device as described above has the following problems.
That is, in the device disclosed in Japanese Patent Application Laid-Open No. 2-3740, the ATCU is provided in the small space 18 in the closed space formed in the extension housing, so that the heat generated from the ATCU is easily trapped in the room 18. Although the heat radiating fins 22 are provided, it is difficult to efficiently radiate and cool the ATCU.
Further, in the technique disclosed in Japanese Patent Application Laid-Open No. 9-53706, the torque converter generates heat when the automatic transmission operates, and the temperature of the air in the casing 11 rises. It is difficult to cool the ATCU effectively because the wind itself has a high temperature.
An object of the present invention is to solve such a problem.
[0004]
[Means for Solving the Problems]
The present invention provides an electronic control device on a mounting seat protruding inward from an inner wall portion of an extension housing of an automatic transmission, a fan provided on a parking gear in the extension housing, and an electronic control device using wind sent from the electronic control device. The above problem is solved by cooling. That is, an automatic transmission with an electronic control device according to the present invention is characterized in that a parking gear (14) rotated by a rotating shaft (18) is provided in an extension housing (10) of the automatic transmission. An electronic control unit (ATCU12) for controlling the transmission and a fan (16) for blowing air to the electronic control unit (ATCU12) are provided, and an exhaust pipe of the vehicle is provided along the outside of the extension housing (10). (30) is arranged,
The fan (16) is integrally attached to a gear side surface of the parking gear (14),
The electronic control unit (ATCU12) is provided on the inner peripheral wall at a position downstream of the fan from the position where the fan (16) is disposed, and the exhaust pipe ( 30) is disposed on an electronic control device mounting portion provided on the opposite side to the disposition side, and the electronic control device mounting portion is provided with an amount of space that allows the air by the air to flow from the inner wall surface. A mounting seat protruding inward and extending along a vertical plane parallel to the axis of the rotation shaft (18) is formed. By mounting the electronic control unit (ATCU12) on the mounting seat, the fan (16) is mounted. ), The electronic control unit (ATCU12) is configured to be cooled from both the front and back sides of the substrate.
[0005]
According to a second aspect of the present invention, the extension housing (10) is formed with an intake hole (24) that penetrates a circumferential wall corresponding to the fan (16) and communicates with outside air. It is characterized by:
According to a third aspect of the present invention, the inner peripheral wall on which the mounting seat is formed is a lateral wall (10a).
According to a fourth aspect of the present invention, the intake hole (24) is located at an upper position where it does not interfere with a bush (28) lubricating oil gutter (32) disposed on an inner peripheral upper side of the extension housing (10). A tube (25) extending outward is attached to the intake hole (24).
According to a fifth aspect of the present invention, the extension housing (10) substantially corresponds to the intake hole (24) at a position downstream of the air blow from a position where the electronic control unit (ATCU12) is arranged. An exhaust hole (26) that penetrates a circumferential wall portion at a position where the air hole communicates with outside air is formed.
According to a sixth aspect of the present invention, the mounting seat is formed integrally with the extension housing (10).
Note that reference numerals in parentheses indicate corresponding members of the embodiment.
[0006]
[Action]
The electronic control unit is mounted vertically in the extension housing with a relatively large space volume, separated from the inner peripheral wall of the extension housing by an amount that allows air to flow through the space. The air flows and becomes easier to cool. Further, oil dropped from the upper inner wall portion of the extension housing is less likely to be applied to the electronic control device. Furthermore, since the cooling fan rotates at a rotational speed corresponding to the vehicle speed of the vehicle, the fan sends air of a flow rate corresponding to the vehicle speed to both the front and back sides of the board of the electronic control device. Thus, the electronic control unit is efficiently cooled. Since the electronic control unit is mounted on the side of the extension housing remote from the exhaust pipe of the vehicle, the electronic control unit is not affected by exhaust heat radiated from the exhaust pipe, and the cooling efficiency is further improved.
[0007]
According to the second aspect of the present invention, since the fan can draw in relatively low-temperature outside air from the air intake hole and blow it to the electronic control unit, the electronic control unit is cooled more effectively.
According to the third aspect of the present invention, it is possible to further reduce the amount of oil splashed from the bottom in the extension housing and oil dropped from the upper gutter to fall on the electronic control device. The equipment is more reliably protected from oil contamination.
According to the configuration described in claim 4, oil in the extension housing is prevented from being blown out from the intake hole to the outside.
According to the fifth aspect of the present invention, the heated air after absorbing heat from the electronic control unit can be discharged to the outside, so that the cooling effect of the electronic control unit is further enhanced.
In the case of the structure described in claim 6, the work of mounting the spacer on the extension housing is not required, and the mounting work of the electronic control device can be performed efficiently because the mounting bolt with a short dimension can be used. Is
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
1 and 2 show an embodiment of the present invention. FIG. 1 shows a vertical cross-section of the automatic transmission, with a part thereof being omitted. The extension housing 10 is connected to a casing 50 on the left side of the figure with bolts 52. In the extension housing 10, a rotating shaft 18, a parking gear 14, a fan 16, an ATCU (electronic control unit) 12, a bush 28, and a seal member 29, which extend through a casing 50 of the automatic transmission, are arranged. . The bush 28 rotatably supports the right end of the rotating shaft 18. Further, the seal member 29 has a clearance between the inner periphery of the right end side of the extension housing 10 and the outer periphery of the bush 28 and a clearance between the inner periphery of the bush 28 and the outer periphery of the right end side of the rotary shaft 18. , Each of which seals the oil from leaking outside. In FIG. 1, an ATCU 12 is arranged at an inner circumferential side of a substantially central portion of an extension housing 10 of the automatic transmission in the axial direction. An exhaust pipe 30 of the vehicle is disposed outside the right side of the extension housing 10 in FIG. The ATCU 12 and the exhaust pipe 30 are disposed so as to be located on opposite sides of the axis of the rotating shaft 18, and the ATCU 12 is blown inward from the side wall portion 10 a of the extension housing 10 by air. They are spaced apart by a gap that allows air to flow. That is, the ATCU 12 is provided on the left side wall portion 10a of the extension housing 10 in the drawing via a total of four pipe-shaped spacers 20, 20, 22, and 22 along the vertical plane parallel to the axis of the rotating shaft 18. And mounting bolts 23. In this embodiment, the mounting seat is constituted by the side wall portion 10a of the extension housing 10 and the four spacers 20, 20, 22, and 22.
[0009]
When the exhaust pipe 30 is arranged on the left side with respect to the axis of the rotating shaft 18, contrary to the arrangement shown in FIG. 2, the ATCU 12 is arranged on the right side with respect to the axis of the rotating shaft 18. Will do.
By arranging as described above, the ATCU 12 can be prevented from being affected by the exhaust heat radiated from the exhaust pipe 30, and the ATCU 12 is blown by the fan 16 so that the ATCU 12 is positioned on the front and back of the board. It is possible to cool from both sides. In addition, as described later, when the oil drops from the gutter 32 formed at the top of the inner wall of the extension housing 10, the oil does not easily fall on the ATCU 12, so that the ATCU 12 can be protected from oil contamination.
A parking gear 14 is disposed on the left side (the automatic transmission side) of the ATCU 12 in FIG. As shown in FIGS. 3 and 4, the parking gear 14 is provided with a fan 16 integrally on a side surface of the gear. The parking gear 14 and the fan 16 are mounted integrally with the rotating shaft 18.
[0010]
In FIG. 1, the extension housing 10 is provided with an intake hole 24 at a circumferential upper position corresponding to the fan 16, and an exhaust hole 26 is provided on the right side of the drawing at the position where the ATCU 12 is arranged. Have been. Thus, when the fan 16 is rotated via the rotating shaft 18 and the parking gear 14, the fan 16 draws relatively low-temperature outside air inward from the intake hole 24 of the extension housing 10, so that the fan 16 It is possible to blow heat so as to pass through the both sides on the back side to take heat from the ATCU 12, and to discharge the heated air from the ATCU 12 through the exhaust hole 26 on the downstream side to the outside of the extension housing 10.
A protruding gutter 32 is formed on the inner peripheral top side of the extension housing 10 in FIG. As shown in FIG. 1, the gutter 32 reaches the upper part of the outer periphery of the bush 28, and oil for lubricating a sliding portion between the bush 28 and the rotating shaft 18 flows down the gutter 32 and flows down. ing. In addition, the oil after lubricating the bush 28 is stored at the bottom of the extension housing 10 in FIG.
The above-described intake hole 24 is formed at a position that does not interfere with the gutter 32. A tube 25 is attached to the intake hole 24 so as to extend outward. The tube 25 is provided for the purpose of preventing the oil in the extension housing 10 from blowing out from the intake hole 24 to the outside during running of the vehicle.
[0011]
Next, the operation of this embodiment will be described. The rotation shaft 18, the parking gear 14, and the fan 16 rotate at a rotation speed corresponding to the traveling speed of the vehicle. Therefore, the fan 16 supplies air to the ATCU 12 at a flow rate corresponding to the traveling speed of the vehicle. That is, the fan 16 draws relatively low-temperature outside air into the extension housing 10 from the intake hole 24 and blows it toward the ATCU 12. At this time, since the ATCU 12 is arranged so as to be floated from the side wall 10a of the extension housing 10 by the spacers 20 and 22, the wind blows through both the front and back surfaces of the substrate of the ATCU 12, and the heat is efficiently released from the ATCU 12. Is robbed. The air whose temperature has risen by removing heat from the ATCU 12 is discharged to the outside through the exhaust holes 26 on the downstream side.
[0012]
Therefore, while the fan 16 is rotating, relatively low-temperature outside air is continuously drawn into the extension housing 10 from the intake hole 24 and blown to both sides of the substrate of the ATCU 12, and the heated air after heat exchange is exhausted. It will be continuously discharged outside through the hole 26.
Since the ATCU 12 is mounted on the side of the extension housing 10 away from the exhaust pipe 30 of the vehicle, the ATCU 12 is not affected by the exhaust heat radiated from the exhaust pipe 30 and can further improve the cooling efficiency. it can.
Further, as described above, the ATCU 12 is provided vertically on the side wall portion 10a in the left-right direction of the extension housing 10, so that the oil accumulated on the bottom surface of the extension housing 10 splatters or moves upward as the vehicle travels. Even if oil for lubricating the bush 28 flowing down the gutter 32 drops, it is possible to minimize such oil adhering to the ATCU 12 and contaminating it.
[0013]
In the description of the above embodiment, the ATCU 12 is provided on the left side wall 10a of the extension housing 10, but the exhaust pipe 30 of the vehicle is disposed on the right side of the extension housing 10. In the case where the exhaust pipe is arranged on the left side of the extension housing 10, the ATCU 12 is provided on the right side wall of the extension housing 10 so as not to be heated by exhaust heat from the exhaust pipe. Will be provided.
In the description of the above embodiment, the mounting seat is constituted by the side wall portion 10a of the extension housing 10 and the four spacers 20, 20, 22 and 22. Instead of using the extension housing 10, a mounting seat protruding inward from the side wall portion 10a by a predetermined dimension may be formed.
Further, in the description of the above-described embodiment, the tube 25 is provided in the intake hole 24 to prevent the oil in the extension housing 10 from blowing out, but the same tube is provided in the exhaust hole 26. It is good to do.
[0014]
【The invention's effect】
As described above, according to the present invention, since the electronic control device is vertically mounted in the extension housing having a relatively large space volume at a predetermined distance from the inner peripheral wall surface thereof, Oil dripped from the upper inner wall of the housing can be made less likely to catch on the electronic control unit. In addition, since the cooling fan rotates at a rotation speed corresponding to the vehicle speed of the vehicle, the fan sends a wind having a flow rate corresponding to the vehicle speed to both the front and back sides of the board of the electronic control device. In addition, the electronic control device can be efficiently cooled. Since the electronic control unit is mounted on the side of the extension housing remote from the exhaust pipe of the vehicle, the electronic control unit is not affected by exhaust heat radiated from the exhaust pipe, so that the cooling efficiency can be further improved. .
[0015]
With the configuration as described in claim 2, the fan can draw in relatively low-temperature outside air from the intake hole and blow it to the electronic control device, so that the electronic control device can be cooled more effectively. it can.
According to the third aspect of the present invention, it is possible to further reduce the amount of oil splashed from the bottom in the extension housing and oil falling from the upper gutter falling on the electronic control device. Can be more reliably protected from oil contamination.
According to the structure described in claim 4, it is possible to prevent oil in the extension housing from being blown out from the intake hole to the outside.
According to the fifth aspect, the heated air that has absorbed heat from the electronic control unit can be discharged to the outside, so that the cooling effect of the electronic control unit can be further enhanced.
According to the sixth aspect, the work of mounting the spacer on the extension housing is not required, and the mounting work of the electronic control device can be performed efficiently because the mounting bolt having a short dimension can be used. be able to.
[Brief description of the drawings]
FIG. 1 is a partial longitudinal sectional view of an automatic transmission according to an embodiment of the present invention.
FIG. 2 is a sectional view taken along line 2-2 of FIG.
FIG. 3 is a partial front view of a parking gear and a fan.
FIG. 4 is a partial side view of a parking gear and a fan.
[Explanation of symbols]
10 extension housing 10a side wall 12 ATCU (electronic control unit)
14 Parking gear 16 Fan 18 Rotating shaft 20, 22 Spacer 24 Intake hole 25 Tube 26 Exhaust hole 28 Bush 30 Exhaust pipe 32 Gutter

Claims (6)

A parking gear rotated by a rotating shaft, an electronic control device for controlling the automatic transmission, and a fan for blowing air to the electronic control device are provided in an extension housing of the automatic transmission. The exhaust pipe of the vehicle is located along
The fan is integrally attached to a gear side surface of the parking gear,
The electronic control unit is an inner peripheral wall portion at a position on the downstream side of air blowing from a position where the fan is arranged, and a portion on a side opposite to an arrangement side of the exhaust pipe with respect to an axis of an extension housing. The electronic control device mounting portion is provided, and the electronic control device mounting portion protrudes inward from the inner wall surface by a gap that allows the air to flow by the blast, and is in contact with the axis of the rotation shaft. A mounting seat is formed along a parallel vertical surface,
By mounting the electronic control device on the mounting seat, the electronic control device is configured to be cooled from both directions of the front surface and the back surface of the board by the air blown from the fan. Automatic transmission with control device. 2. The automatic transmission with an electronic control device according to claim 1, wherein the extension housing is formed with an intake hole that penetrates a circumferential wall portion corresponding to the fan and communicates with outside air. The automatic transmission with an electronic control device according to claim 1, wherein the inner peripheral wall portion on which the mounting seat is formed is a left-right side wall portion. The intake hole is provided at an upper position not interfering with a bush lubrication oil gutter disposed on the inner peripheral upper side of the extension housing, and a tube extending outward is attached to the intake hole. The automatic transmission with an electronic control device according to claim 2 or 3, wherein: In the extension housing, an exhaust hole that penetrates a circumferential wall at a position substantially corresponding to the intake hole and communicates with the outside air is provided at a position downstream of the air supply from a position where the electronic control device is arranged. The automatic transmission with an electronic control device according to claim 2, wherein the automatic transmission is formed. 6. The automatic transmission with an electronic control device according to claim 1, wherein the mounting seat is formed integrally with the extension housing.

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