JP2003112532A - Automatic transmission having electronic control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic transmission capable of suppressing an effect of heat from the automatic transmission or the like on an electronic control device even when the transmission has the electronic control device integrally. SOLUTION: In the automatic transmission (A/T) 2 integrally having the electronic control device (ECU) 1, mounting parts 8a and 8b of an ECU case 8 are mounted to A/T bosses 6 and 7 projected from an A/T case 5, and a predetermined space 12 is formed between the A/T case 5 and the ECU case 8. This space 12 prevents the heat from the A/T 2 from transmitting to the ECU 1, and suppresses the effect of the heat from the A/T 2 on the ECU 1. Long-sized radiating fins 13 are disposed in the ECU case 8, heat generated by the ECU 1 itself is radiated by the radiating fins 13, and an effect of heat from the ECU 1 itself on the ECU 1 is suppressed. Especially, the radiating fins 13 are cooled by wind or running wind of a radiator fan 3, so that the heat of the ECU 1 is effectively radiated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic transmission (hereinafter also referred to as A / T) integrally provided with an electronic control unit (hereinafter also referred to as ECU) for controlling electric equipment such as a solenoid valve of the automatic transmission. (Notation)), and in particular, to the technical field of an automatic transmission equipped with an electronic control unit that suppresses the influence of heat due to the temperature rise of hydraulic oil of the automatic transmission when the vehicle is traveling.

[0002]

2. Description of the Related Art Automatic transmissions for automobiles include, for example, parking ranges, drive ranges, neutral ranges,
A plurality of shift ranges such as a first speed range, a second speed range, and a reverse range are provided. Then, in each shift range, the electronic control unit controls an electric device such as an A / T solenoid valve in accordance with an automatic shift control program stored in the microcomputer, thereby performing automatic shift control and the like.

For such an automatic transmission, various A / Ts having an integrated ECU have been proposed due to downsizing and the like. A conventional A / T that integrally includes such an ECU has an ECU disposed inside a case of the A / T. One example thereof is, for example, Japanese Patent Laid-Open No. 2000-1.
There is an A / T proposed in Japanese Patent No. 20850. Thus, by incorporating the ECU in the A / T case, the A / T can be made more compact.

[0004]

By the way, in an A / T incorporating such a conventional ECU, the ECU is
/ T It comes to be immersed in the hydraulic oil in the case. However, if the ECU is submerged in hydraulic oil, A
Since the temperature of hydraulic oil rises due to the operation of / T, etc.
There is a problem that the circuit board of U is affected by the heat of the hydraulic oil.

Therefore, it is possible to avoid the direct influence of the heat of the hydraulic oil on the circuit board by mounting the ECU on the outer surface of the A / T case so that the ECU is not directly immersed in the hydraulic oil. In that case, it is conceivable to simply attach the ECU case to the outer surface of the A / T case by bringing the ECU case into contact with the A / T case.

However, if the ECU is simply attached to the outer surface of the A / T case as described above, the ECU case comes into contact with the A / T case. / T case → ECU case → Circuit board The heat transfer path leads to the circuit board.

Therefore, if the ECU is simply attached to the outer surface of the A / T case, even if the direct influence of the heat of the hydraulic oil on the circuit board is avoided as described above, the circuit of the ECU is still kept. It is conceivable that the substrate is affected by the heat from the hydraulic oil transferred via the heat transfer path, and the effect of the heat from the hydraulic oil cannot be suppressed more effectively.

The present invention has been made in view of such circumstances, and an object thereof is to prevent the influence of heat from an automatic transmission or the like on the electronic control device even if the electronic control device is integrally provided. An object of the present invention is to provide an automatic transmission provided with an electronic control device that can be suppressed more effectively.

[0009]

In order to solve the above-mentioned problems, an automatic transmission provided with an electronic control device according to a first aspect of the present invention is such that the electronic control device for controlling the automatic transmission is an automatic transmission case. The automatic transmission mounted on the outer surface is characterized in that a predetermined space is formed between the automatic transmission case and the electronic control unit case.

According to a second aspect of the present invention, at least one of the automatic transmission case and the electronic control unit case is provided with a predetermined number of protrusions, and the electronic control unit case is provided with the protrusions. It is characterized by being attached to the automatic transmission case.

Further, the invention according to claim 3 is characterized in that the electronic control unit case is mounted at a position where it is cooled by wind from a radiator fan or traveling wind.

Further, the invention of claim 4 is characterized in that, of the automatic transmission case and the electronic control unit case, at least the electronic control unit case is provided with a radiation fin.

Further, the invention of claim 5 is characterized in that the heat radiation fin is provided at a position where it is cooled by wind from a radiator fan or traveling wind.

Further, in the invention of claim 6, the heat radiation fin is formed in a long shape or a dot shape, and is provided along the direction in which the wind from the radiator fan or the traveling wind flows. It has a feature.

Further, according to a seventh aspect of the present invention, a circuit board is mounted on an inner surface of the electronic control unit case, and the heat radiation fin is an outer surface of the electronic control unit case with respect to a circuit board mounting surface of the electronic control unit case. It is characterized by being provided in.

[0016]

According to the automatic transmission having the electronic control unit of the present invention having the above-described structure, a predetermined space is formed between the automatic transmission case and the electronic control unit case. Therefore, most of the electronic control unit case can be separated from the automatic transmission case. This allows
The heat from the automatic transmission can be made difficult to transfer to the electronic control device, and even if the electronic control device is integrally attached to the automatic transmission, the influence of the heat from the automatic transmission on the electronic control device can be suppressed. .

Further, since the electronic control unit is attached to the outer surface of the automatic transmission case, the heat generated by the temperature rise of the hydraulic oil of the automatic transmission is not directly transmitted to the electronic control unit as in the conventional example described above. As compared with the case where the electronic control device is provided in the automatic transmission case as in the above-described conventional example, the influence of heat on the electronic control device can be significantly suppressed.

In particular, according to the second aspect of the present invention, a predetermined number of projections provided on at least one of the automatic transmission case and the electronic control unit case provide a space between the automatic transmission case and the electronic control unit case. A predetermined space is formed. Therefore, a space can be formed with a simple structure, and since the electronic control unit case is attached to the automatic transmission case through the protrusion, heat from the automatic transmission can be prevented from being transmitted to the electronic control unit case. Can be suppressed.

According to the third aspect of the invention, since the electronic control unit case is cooled by the wind or the traveling wind from the radiator fan, the wind or the traveling wind of the radiator fan is effectively used to perform the electronic control. The controller case can be cooled.

Further, according to the invention of claim 4, since the radiation fin is provided at least in the electronic control unit case,
The heat radiation of the electronic control device can be effectively radiated by the heat radiation fins. Further, by disposing the heat dissipation fins also in the automatic transmission case, the heat of the automatic transmission can be effectively dissipated, and the heat of the automatic transmission transmitted to the electronic control device can be suppressed.

Further, according to the invention of claim 5, since the radiation fins are cooled by the wind from the radiator fan or the running wind, the wind of the radiator fan or the running wind is effectively utilized to prevent the radiation fins from running. The heat dissipation effect can be improved.

In this case, according to the invention of claim 6, since the heat dissipating fins are formed in a long shape or a dot shape and are provided along the direction in which the wind from the radiator fan or the traveling air flows. The heat dissipation effect of the heat dissipation fins can be further improved.

Further, according to the invention of claim 7, since the radiation fins are provided on the outer surface of the electronic control unit case relative to the circuit board mounting surface on the inner surface of the electronic control unit case,
The heat radiation fins can more effectively dissipate the heat generated from the circuit board of the electronic control device, and also dissipate the heat of the automatic transmission transmitted through the automatic transmission case. Therefore, it is possible to more reliably prevent the influence of these heats on the circuit board of the electronic control device. In that case, the electronic control unit is improved by further improving the heat radiation effect of the heat radiation fin by at least one of effectively using the wind of the radiator fan or the traveling wind and forming the heat radiation fin in a long shape or in a dot shape. The influence of these heats on the circuit board can be suppressed more effectively.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an example of an embodiment of an automatic transmission including an electronic control device according to the present invention,
(A) is a figure which shows typically the state which arrange | positioned this automatic transmission in the engine room, (b) shows the state which attached the electronic control unit which controls the automatic transmission of this example to the automatic transmission case. FIG. 2 is an enlarged and schematic perspective view showing a state in which the electronic control unit of this example is attached to an automatic transmission case.

As shown in FIG. 1 (a), the automatic transmission 2 integrally provided with the electronic control unit 1 of this example has the EC
U1 and A / T2 are arranged at predetermined positions in the engine room 4 so as to directly hit the wind or traveling wind from the radiator fan 3. As shown in FIG. 1 (b),
The ECU 1 is attached to a case 5 (also referred to as an A / T case) 5 of an A / T 2. In that case, as shown in FIG. 1B and FIG. 2, a predetermined number of A / T bosses (four A / T bosses in the illustrated example) are formed on the outer surface of the A / T case 5.
However, the number is not limited to these four, and any number can be provided. The mounting portions 8a and 8b of the (noted) 8 are mounted by bolts 9 and 10, respectively. In the ECU case 8, a circuit board 11 including a microcomputer for controlling electrical equipment such as a solenoid valve of the A / T 2
Is housed.

When the ECU case 8 is attached to the A / T case 5, a predetermined space 12 is formed between the A / T case 5 and the ECU case 8. Also, the ECU
The case 8 on the side of the first circuit board 11 is provided with a predetermined number of elongated heat radiation fins 13 so as to project into the space 12. As shown in FIG. 1 (b), these elongated heat dissipating fins 13 have a direction in which the wind of the radiator fan 3 or the traveling wind of the vehicle flows (in the upper right direction in FIG. 1 (b): the drawing in FIG. Linearly extending along the direction orthogonal to the direction.

As clearly shown in FIG. 2, the above-mentioned circuit board 11 is mounted on the inner surface 8c of the ECU case 8, and all the above-mentioned heat radiation fins 13 are attached to the ECU case 8.
It is provided on the outer surface 8d of the ECU case 8 with respect to the circuit board mounting surface (corresponding to the inner surface 8c). Although the heat radiation fins 13 can be provided on the outer surface of the ECU case 8 other than the outer surface 8d of the ECU case 8 with respect to the circuit board mounting surface (corresponding to the inner surface 8c) of the ECU case 8 in the illustrated example, effective heat radiation is required. In order to enable the above, it is preferable to provide at least on the outer surface 8d of the ECU case 8 with respect to the circuit board mounting surface of the ECU case 8 as in the illustrated example.

According to the automatic transmission 2 integrally provided with the electronic control unit 1 of this example configured as described above, the ECU case 8 is attached to the A / T bosses 6 and 7 protruding from the A / T case 5.
Only the mounting parts 8a and 8b of
A predetermined space 12 between the / T case 5 and the ECU case 8
Since most of the ECU case 8 is formed apart from the A / T case 5, the heat from the A / T 2 can be less easily transferred to the circuit board 11 of the ECU 1. Therefore, even if the ECU 1 is integrally attached to the A / T case 5,
The influence of heat from the A / T 2 on the circuit board 11 of the ECU 1 can be effectively suppressed.

Since a predetermined number of elongated heat radiation fins 13 are provided on the side surface of the circuit board 11 of the ECU case 8,
With these radiation fins 13, the circuit board 1 of the ECU 1
The heat generated by 1 itself can be dissipated. Therefore, the influence of heat on the circuit board 11 of the ECU 1 can be further suppressed.

In particular, since the long radiating fins 13 are extended along the direction in which the wind of the radiator fan 3 or the traveling wind of the vehicle flows, the wind of the radiator fan 3 or the traveling wind of the vehicle can be effectively used. Thus, the ECU case 8 and the heat radiation fin 13 can be effectively cooled. As a result, the heat dissipation effect of the ECU case 8 and the heat dissipation fin 13 can be improved, and the heat of the circuit board 11 of the ECU 1 can be more effectively dissipated via the ECU case 8 and the heat dissipation fin 13. At this time, the A / T bosses 6 and 7 of the A / T case 5 and the mounting portions 8a and 8 of the ECU case 8 are attached.
The heat transferred from the A / T case 5 to the ECU case 8 via b can also be reliably released. Therefore,
The influence of heat on the circuit board 11 of the ECU 1 can be suppressed more efficiently.

Further, since the ECU 1 is attached to the outer surface of the A / T case 5, the heat of the hydraulic oil of the A / T 2 is not directly transmitted to the ECU 1 unlike the above-mentioned conventional example. Therefore, as in the conventional example described above, the ECU is provided in the A / T case 5.
Compared with the case where 1 is provided, the influence of heat on the ECU 1 can be significantly suppressed.

As shown by the chain double-dashed line in FIG.
The case 5 and the A / T bosses 6 and 7 can also be provided with the radiation fins 14. In this case, the heat of the A / T 2 is dissipated into the atmosphere through the heat radiation fins 14, so that the heat of the A / T 2 transmitted to the ECU 1 can be suppressed more effectively.

Further, the long radiating fins 13 can be provided so as to be inclined at a predetermined angle with respect to the direction of the wind from the radiator fan 3 and the traveling wind, and the shape of the long radiating fins 13 can be also increased. Instead of a straight line, one circular arc, S
It can also be formed in various shapes such as a letter shape and a wave shape. By doing so, it is possible to effectively use the wind from the radiator fan 3 and the traveling wind, so that the heat radiation effect of the heat radiation fins 13 is improved.

Further, instead of the elongated heat radiation fins 13,
It is also possible to provide a predetermined number of dot-shaped heat radiation fins 13.
In that case, the predetermined number of dot-shaped heat radiation fins 13 can be aligned along at least one of the front-rear direction and the left-right direction of the vehicle, or can be provided at random. Furthermore, the ECU case 8 may be provided with a boss for attachment to the A / T case 5.

FIG. 3 is a view similar to FIG. 2, showing another example of the embodiment of the present invention. As shown in FIG. 3, in the automatic transmission 2 including the electronic control unit 1 of this example, the electronic control unit 1 of the above-described example is mounted upside down. That is, in this example, the circuit board 11 and the radiation fins 13
However, the structure is reversed from that of the example shown in FIG. Also in the automatic transmission 2 of this example, the A / T case 5
A space 12 is formed between the ECU case 8 and the ECU case 8.

In the automatic transmission 2 of this example configured as described above, the circuit board 11 and the radiation fin 13 are A
Not only is it not located on the side directly facing the / T case 5, but it is also provided away from the A / T case 5. Therefore, in combination with the space 12 between the A / T case 5 and the ECU case 8, the heat from the A / T case 5 becomes E.
It is difficult for the heat to be transmitted to the circuit board 11 of the CU 1, and the influence of heat from the A / T case 5 on the circuit board 11 can be more effectively prevented. The other configuration of this example is the same as the above-mentioned example, and the operation effect and modification of this example are also the same as the above-mentioned example.

[Brief description of drawings]

FIG. 1 shows an example of an embodiment of an automatic transmission equipped with an electronic control device according to the present invention, and FIG. 1 (a) is a diagram schematically showing a state in which the automatic transmission is arranged in an engine room, FIG. 4B is a perspective view partially and schematically showing a state in which an electronic control unit for controlling the automatic transmission of this example is attached to an automatic transmission case.

FIG. 2 is an enlarged view showing a mounting state of the electronic control unit of this example in an automatic transmission case.

FIG. 3 is a view similar to FIG. 2, showing another example of the embodiment of the present invention.

[Explanation of symbols]

1 ... Electronic control unit (ECU), 2 ... Automatic transmission (A /
T), 3 ... radiator fan, 4 ... engine room, 5
… Automatic transmission case (A / T case), 6,7… A / T
Boss, 8 ... Electronic control unit case (ECU case), 8
a, 8b ... mounting part, 9,10 ... bolt, 11 ... circuit board,
12 ... Space, 13, 14 ... Radiating fins

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Naoto Ogasawara             10 Akane, Takane, Fujii-cho, Anjo City, Aichi Prefecture             N AW Co., Ltd. (72) Inventor Kenji Suzuki             10 Akane, Takane, Fujii-cho, Anjo City, Aichi Prefecture             N AW Co., Ltd. F-term (reference) 3D038 AA05 AA10 AB01 AC00 AC14                       AC23                 3J063 AA02 AC04 BA15 CC35 CD44                       XA01 XH06 XH13 XH25 XH42                 3J552 MA01 NA01 NB01 PA61 QC01

Claims (7)

[Claims] 1. An automatic transmission in which an electronic control unit for controlling the automatic transmission is attached to an outer surface of an automatic transmission case, and a predetermined unit is provided between the automatic transmission case and the electronic control unit case. An automatic transmission provided with an electronic control device, characterized in that a space is formed. 2. A predetermined number of protrusions are provided on at least one of the automatic transmission case and the electronic control unit case, and the electronic control unit case is attached to the automatic transmission case via the protrusions. An automatic transmission provided with the electronic control unit according to claim 1. 3. The automatic transmission provided with the electronic control device according to claim 1, wherein the electronic control device case is mounted at a position where it is cooled by wind from a radiator fan or traveling wind. . 4. A radiating fin is provided in at least the electronic control unit case of the automatic transmission case and the electronic control unit case.
An automatic transmission comprising the electronic control device according to any one of 1 to 3. 5. The automatic transmission equipped with an electronic control device according to claim 4, wherein the heat radiation fins are provided at a position where they are cooled by wind from a radiator fan or traveling wind. 6. The heat dissipating fin is formed in a long shape or a dot shape, and is provided along a direction in which wind from the radiator fan or traveling wind flows. Automatic transmission equipped with the electronic control unit of. 7. A circuit board is mounted on an inner surface of the electronic control unit case, and the heat radiation fins are provided on an outer surface of the electronic control unit case with respect to the circuit board mounting surface of the electronic control unit case. An automatic transmission comprising the electronic control device according to any one of claims 4 to 6.