JPH1137256A - Automatic transmission with electronic control unit - Google Patents

Abstract

(57) [Summary] Electronic control unit (ATCU) 1 for automatic transmission
2 can be cooled efficiently. An ATCU (12) is provided with four pipe-shaped spacers (20, 20) on an inner peripheral side wall portion of a central portion of an extension housing (10) of an automatic transmission so as to float a predetermined dimension inward from the side wall. , 22 and 2
Attached via 2. The parking gear 14 is arranged closer to the automatic transmission than the ATCU 12. The parking gear 14 has a fan 16 on its side.
Are provided integrally. The parking gear 14 and the fan 16 are supported by a rotation shaft 18 so as to rotate at a rotation speed corresponding to the vehicle speed of the vehicle. The extension housing 10 is provided with an intake hole 24 at the top position in the circumferential direction corresponding to the fan 16 so as to communicate with the outside air. Similarly, an exhaust hole 26 is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic transmission with an electronic control unit.

[0002]

2. Description of the Related Art Conventional automatic transmissions with an electronic control unit include those disclosed in Japanese Patent Application Laid-Open No. 2-3740 and 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 closed. An electronic control unit (particularly, an automatic transmission unit is abbreviated as ATCU) 24 is mounted in the space 18 and the fin 2
2, through the cover 14 and the chamber 18, the ATCU 24
Is configured to dissipate and cool heat. 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]

However, the above-mentioned conventional automatic transmission with an electronic control unit has the following problems. That is, in the device disclosed in Japanese Patent Application Laid-Open No. 2-3740, since the ATCU is provided in the small space 18 in the closed space formed in the extension housing, heat generated from the ATCU is likely to be 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 device 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 effectively cool the ATCU because the wind itself becomes high temperature. An object of the present invention is to solve such a problem.

[0004]

According to the present invention, an electronic control unit is provided on a mounting seat protruding inward from an inner wall of an extension housing of an automatic transmission, and a fan is provided on a parking gear in the extension housing. The above-mentioned problem is solved by cooling the electronic control unit with the wind to be sent from now on. That is, an automatic transmission with an electronic control device according to the present invention is the extension housing of the automatic transmission according to the first aspect.
A parking gear (14) rotated by a rotating shaft (18) and an electronic control unit (AT) for controlling an automatic transmission.
CU12), and a fan (16) for blowing air to the electronic control unit (ATCU12). An exhaust pipe (30) of the vehicle is arranged along the outside of the extension housing (10). (16) is integrally attached to a gear side surface of the parking gear (14), and the electronic control unit (AT
The CU 12) is an inner peripheral wall portion at a position downstream of the blower than the position where the fan (16) is arranged, and is located on the side of the arrangement of the exhaust pipe (30) with respect to the axis of the extension housing (10). It is arranged in the electronic control device mounting portion provided on the opposite side to the electronic control device mounting portion, the electronic control device mounting portion protrudes inward from the inner wall only by a gap such that the air by the blowing can flow, A mounting seat is formed along a vertical plane parallel to the axis of the rotation shaft (18), and the electronic control unit (ATCU12) is mounted on the mounting seat, whereby air is blown from the fan (16). The electronic control unit (ATCU12) is characterized in that it is configured to be cooled from both the front and back sides of the substrate.

According to another aspect of the present invention, the fan (1) is provided in the extension housing (10).
An intake hole (24) penetrating the circumferential wall corresponding to (6) and communicating with the outside air is formed. 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 electronic control unit (ATC) is provided in the extension housing (10).
An exhaust hole (26) penetrating through a circumferential wall at a position substantially corresponding to the intake hole (24) and communicating with the outside air is formed at a position downstream of the air flow from the position where U12) is arranged. It is characterized by having. 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]

The electronic control device is vertically mounted in the extension housing having a relatively large space volume and separated from the inner peripheral wall by a gap allowing air to flow therethrough. The air flows through the gap and is easily cooled. Further, oil dripped from the upper inner wall of the extension housing is less likely to be applied to the electronic control unit. Furthermore, since the cooling fan rotates at a rotation 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 in the extension housing on the side remote from the exhaust pipe of the vehicle, the electronic control unit is not affected by the exhaust heat radiated from the exhaust pipe, and the cooling efficiency is further improved.

[0007] In the case of the structure described in claim 2,
Since the fan can take in relatively low-temperature outside air from the intake holes 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 the oil splashed from the bottom in the extension housing and the 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 construction as 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. Will be

[0008]

FIG. 1 and FIG. 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 is provided with a clearance between the inner periphery of the right end of the extension housing 10 and the outer periphery of the bush 28, and the bush 28.
Oil is leaked to the outside from the fitting clearance between the inner circumference of the rotary shaft 18 and the outer circumference on the right end of the rotary shaft 18. Extension housing 1 of the automatic transmission in FIG.
The ATCU 12 is arranged substantially at the inner circumferential side of the central portion in the axial direction of 0. An exhaust pipe 30 of the vehicle is disposed outside the right side of the extension housing 10 in FIG. ATCU12 and exhaust pipe 30
The ATCU 12 is disposed so as to be located on the opposite sides with respect to the axis of the rotation shaft 18, and the ATCU 12 is moved inward from the side wall 10 a of the extension housing 10.
They are spaced apart by a gap that allows the air to flow by the blast. That is, the ATCU 12 controls the rotation shaft 18.
Are attached to the left side wall portion 10a of the extension housing 10 in the figure via a total of four pipe-shaped spacers 20, 20, 22 and 22 by mounting bolts 23 along a vertical plane parallel to the axis of I have. In this embodiment, the extension housing 10
The mounting seat is constituted by the side wall portion 10a and the four spacers 20, 20, 22, and 22.

When the exhaust pipe 30 is arranged on the left side with respect to the axis of the rotating shaft 18, as opposed to the arrangement shown in FIG. 2, the ATCU 12 moves with respect to the axis of the rotating shaft 18. It will be placed on the right side. 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. Further, as described later, a gutter 32 formed at the top of the inner wall of the extension housing 10 is formed.
When the oil is dropped, the oil hardly splashes 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 integrally provided with a fan 16 on a side surface of the gear. The parking gear 14 and the fan 16 are mounted integrally with the rotating shaft 18.

In FIG. 1, the extension housing 10 is provided with an intake hole 24 at an upper position in the circumferential direction corresponding to the fan 16, and an exhaust hole at the right side in the figure from the position where the ATCU 12 is arranged. 26 are provided. Accordingly, when the fan 16 is rotated via the rotating shaft 18 and the parking gear 14, the relatively low-temperature outside air is supplied to the intake port 2 of the extension housing 10.
4, the air is blown inward through the front and back sides of the substrate of the ATCU 12 to take heat from the ATCU 12, and the air heated by taking this heat is discharged from the extension housing 10 through the exhaust hole 26 on the downstream side. It can be discharged outside. 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-mentioned intake hole 24 is provided in the gutter 3
2 is formed at a position not to interfere. A tube 25 that extends outward from the intake hole 24 is attached to the intake hole 24. 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.

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 the ATCU 12 with wind having 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
Spray towards 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.

Therefore, while the fan 16 is rotating, relatively low-temperature outside air is continuously sucked into the extension housing 10 from the air intake hole 24 and is blown onto both surfaces of the substrate of the ATCU 12 to increase the temperature after heat exchange. The air is continuously discharged to the outside from the exhaust hole 26. AT
Since the CU 12 is mounted in the extension housing 10 on the side remote from the exhaust pipe 30 of the vehicle, the CU 12 is not affected by the exhaust heat radiated from the exhaust pipe 30 and can further improve the cooling efficiency. it can. Also, as described above, AT
Since the CU 12 is provided vertically on the side wall portion 10a in the left-right direction of the extension housing 10, oil accumulated on the bottom surface of the extension housing 10 splatters or travels along the upper gutter 32 as the vehicle travels. Even if oil for lubricating the flowing bush 28 drops, it is possible to minimize such oil adhering to and contaminating the ATCU 12.

In the description of the above embodiment,
The ATCU 12 is provided on the left side wall portion 10a of the extension housing 10. However, this is the case where the exhaust pipe 30 of the vehicle is arranged on the right side of the extension housing 10, and the exhaust pipe is In the case where the ATCU 12 is disposed on the left side, 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. In the description of the above-described embodiment, the mounting seat is the extension housing 1.
0 side wall portion 10a and four spacers 20, 20, 22, and 22.
20, 22, and 22 may not be used, and a mounting seat projecting inward from the side wall 10 a by a predetermined size may be formed integrally with the extension housing 10. Furthermore, in the description of the above-described embodiment, the tube 25 is provided in the intake hole 24 so that the extension housing 1
I tried to prevent the oil inside 0 from blowing out,
A similar tube may be provided in the exhaust hole 26.

[0014]

As described above, according to the present invention, the electronic control unit is vertically mounted in the extension housing having a relatively large space volume by a predetermined distance from the inner peripheral wall surface thereof. Therefore, oil dripped from the upper inner wall of the extension housing can be less likely to be applied to 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 air with 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 in the extension housing on the side away from the exhaust pipe of the vehicle, it is not affected by the exhaust heat radiated from the exhaust pipe, so that the cooling efficiency can be further improved. .

[0015] In the case of the structure described in claim 2,
Since the fan can take in relatively low-temperature outside air from the intake hole and blow it to the electronic control unit, the electronic control unit can be 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 falling from the upper gutter falling on the electronic control device. Can be more reliably protected from oil contamination. According to the configuration described in claim 4, oil in the extension housing can be prevented from blowing 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. In the case of the construction as described in claim 6, the work of mounting the spacer on the extension housing becomes unnecessary, and the mounting work of the electronic control device can be performed efficiently because the mounting bolt with 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]

 DESCRIPTION OF SYMBOLS 10 Extension housing 10a Side wall part 12 ATCU (Electronic control device) 14 Parking gear 16 Fan 18 Rotation shaft 20, 22 Spacer 24 Intake hole 25 Tube 26 Exhaust hole 28 Bush 30 Exhaust pipe 32 Gutter

Claims (6)

[Claims] 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. An exhaust pipe of the vehicle is disposed along an outer side of the extension housing, the fan is integrally attached to a gear side surface of the parking gear, and the electronic control unit is disposed at a position higher than a position where the fan is disposed. An inner peripheral wall portion at a position on the downstream side of the air blow, which is disposed on an electronic control device mounting portion provided at a position opposite to the arrangement side of the exhaust pipe with respect to the axis of the extension housing, In the electronic control unit mounting part,
A mounting seat protruding inward from the inner wall surface by an amount corresponding to a gap through which the air by the blowing can flow is formed along a vertical plane parallel to the axis of the rotation shaft, and the electronic control device is mounted on the mounting seat. By attaching to
An automatic transmission with an electronic control unit, wherein the electronic control unit is configured to be cooled from both directions of the front surface and the back surface of the substrate by the air from the fan. 2. The extension housing includes:
2. The automatic transmission with an electronic control device according to claim 1, wherein an intake hole penetrating through a circumferential wall portion corresponding to the fan and communicating with outside air is formed. 3. An inner peripheral wall portion on which the mounting seat is formed is a lateral side wall portion.
An automatic transmission with an electronic control device as described in the above. 4. The air intake hole is provided at an upper position where it does not interfere with a bush lubrication oil gutter disposed on an inner peripheral upper side of the extension housing, and an outwardly extending tube is provided in the air intake hole. The automatic transmission with an electronic control device according to claim 2 or 3, wherein the automatic transmission is mounted. 5. The extension housing includes:
An exhaust hole that communicates with outside air is formed at a position on the downstream side of the air flow from a position where the electronic control device is disposed, through a circumferential wall portion at a position substantially corresponding to the intake hole. The automatic transmission with an electronic control device according to claim 2, 3 or 4. 6. The automatic transmission with an electronic control device according to claim 1, wherein the mounting seat is formed integrally with the extension housing.