JPH0976785A - Controller of automatic transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent overheating by releasing heat generated in an electronic controller to a shift position detector. SOLUTION: An electric connection line 17 for sending a position signal is caused to function as a heat conductive line by connecting the fixed contact point PP of a shift position detector NSW with the terminal of the substrate of an electronic controller ECU, heat generated in an element 51 on a substrate 50 is conducted to the substrate 50 having good heat conductivity, then released through the connecting line 17 to the metallic fixed contact point PP functioning as a heat sink and the electronic controller ECU is thereby cooled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic transmission, and more particularly, to an electronic control device for controlling the automatic transmission and a range position selected by a driver's shift operation to output the range position to the electronic control device. The present invention relates to a control device including a position detection device.

[0002]

2. Description of the Related Art Conventionally, an automatic transmission is controlled by a hydraulic control device incorporated in its body by an electronic control device.
The automatic transmission main body and the electronic control unit are separately mounted in different parts of the vehicle, and are configured to automatically shift within a range selected by a driver's shift operation. Since these devices are connected to each other when they are mounted on the vehicle, it is not possible to manage the automatic transmission main body and the electronic control device, which are combined up to that point, in a one-to-one correspondence, and the devices are mounted on the vehicle. Later, adjustments must be made to bring the two into alignment. Under these circumstances, comprehensive quality control of automatic transmissions is difficult and requires many man-hours.

Therefore, an attempt has been made to integrate the automatic transmission main body and the electronic control unit to enable quality control in which the two are in a one-to-one correspondence before being mounted on a vehicle. As such an example, there is a technique disclosed in Japanese Patent Publication No. 5-70023. In this technology, in order to output the range position selected by the vehicle driver's shift operation to the electronic control device as an electric signal, a neutral start switch as a shift position detecting device externally attached to the automatic transmission casing has been conventionally used. By incorporating the electronic control device in the case, the automatic transmission main body and the electronic control device are integrated. In such an arrangement, the case is exposed to the outside air and is exposed to the air flow while the vehicle is running, so cooling the case with air cooling can be expected to cool the electronic control unit built into the case. It is also possible to improve the cooling effect by providing a fin for cooling or the like.

[0004]

However, in the electronic control unit, the elements that generate heat due to the flow of current or the like are arranged on the substrate, and the amount of heat generation is different for each element. If the heat from each element that acts as a device cannot be efficiently dissipated, there is a concern that the temperature around the specific element becomes high and its function deteriorates, affecting the function of the entire electronic control device.

On the other hand, the neutral start switch is
As described above, since the case is externally attached to the main body of the automatic transmission, if the size becomes large by providing a large fin for cooling the case, when the automatic transmission is mounted on the vehicle, Due to the relationship with other devices in the engine room, the positions where the other devices, for example, the battery and the like are arranged are restricted or interfere with them.

Therefore, the present invention efficiently transfers the heat generated by each element on the substrate of the electronic control unit to the fixed contact and disperses the heat, and effectively uses the heat radiation using the fixed contact as a heat sink for cooling each element. Is the first purpose.

A second object of the present invention is to shorten the heat transfer path from each element to the fixed contact to cool the electronic control unit more effectively.

A third object of the present invention is to cool the electronic control device more effectively by making the heat transfer path from each element to the fixed contact large in heat transfer capacity.

[0009]

In order to achieve the above first object, the present invention provides a casing, a rotating member which is provided inside the casing, and which rotates in response to a shift operation by a driver. A shift position detecting device including a rotary contact attached to the rotary member and a fixed contact provided in the casing so as to face a rotary locus of the rotary contact;
And an electronic control unit that controls the automatic transmission based on a first state and a second state depending on whether the rotating contact and the fixed contact are in contact with each other, the electronic control unit being disposed on the substrate and on the substrate. In the control device of the automatic transmission, wherein the fixed contact and the terminal of the board are electrically connected by a connecting wire, the board is made of a material having excellent thermal conductivity, The fixed contact is made of a metal material and has a heat dissipation surface, and the connection wire also serves as a heat transfer wire for transferring heat from the terminal of the substrate to the fixed contact.

In order to achieve the second object, the shift position detecting device and the electronic control device are integrally formed.

In order to achieve the third object, the periphery of the joint between the connection line for electrically connecting the fixed contact and the terminal of the substrate and the terminal of the substrate is made of a resin having a high thermal conductivity. It is configured to be solidified together.

[0012]

According to the present invention, the fixed contact of the shift position detecting device is made of a metal material, the substrate of the electronic control device is made of a material having excellent thermal conductivity, and the fixed contact and the terminal of the substrate are provided. Since the connecting wire that electrically connects the components also plays the role of a heat transfer wire, the heat generated from each element on the board of the electronic control unit spreads over the entire board, reaches the fixed contact through the connecting wire, and detects the shift position. Heat is dissipated on the device side by using the fixed contact as a heat sink. Therefore, the cooling effect can be further enhanced as compared with the conventional case, heat is not accumulated around each element, and desired performance as an electronic control device can be exhibited.

Further, according to the second aspect of the present invention, since the shift position detecting device and the electronic control device are integrally formed, the fixed contact and the terminal of the substrate are electrically connected and the role of the heat transfer wire. Also, the length of the connecting line is reduced. Therefore, not only the compactness is improved by the integration of the control device, but also the heat efficiently reaches the fixed contact from the substrate and the heat is not accumulated around each element on the substrate, and the electronic control device has the desired performance. Can be fully exerted.

Further, according to the third aspect of the invention, the resin for integrally solidifying the connecting wire for electrically connecting the fixed contact and the terminal of the substrate and the periphery of the connecting portion of the terminal of the substrate has a thermal conductivity. Since it is made of an excellent material, heat transfer from the board terminals to the connecting wires is greatly improved. Therefore, the substrate can be cooled more effectively than in the conventional case. In addition, since the connecting wire for electrically connecting the fixed contact and the terminal of the board and the periphery of the connecting portion of the terminal of the board are integrally fixed with resin, the electrical connection between the connecting wire and the terminal of the board is made. There is also a side effect that is guaranteed.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. As shown in the cross section of FIG. 1, the control device for the automatic transmission includes a position detecting device portion including a casing configured by a case 10 and a first cover 20 and a rotating member 40, a case 10 and a first cover 20. 2 and a cover 30 and an electronic control unit board 50. Hereinafter, these components and their mutual relations will be described in detail in order.

First, the case 10 is made of a resin material having a good electric insulation property, and as shown in the front and back of FIGS. 2 and 3, a fan-shaped switch chamber 11 on the back side and a rectangular electronic chamber on the front side. It is configured such that it is combined with the control device chamber 12 and that both chambers are separated by a partition wall 13 (see FIG. 1). The switch chamber 11 of the case 10 is arranged such that its fan-shaped key portion is displaced from the electronic control unit chamber 12, and the sleeve shaft portion 43 (see FIG. 1) of the rotating member 40 is fitted in the position of the key portion. Further, a stepped hole 19 for inserting the oil seal 6 (see FIG. 1) for sealing the periphery thereof is formed. On the other hand, on the side of the electronic control unit room 12, integrally molded connectors 14 and 15 for transmitting and receiving signals, which are provided from two sides of the rectangle, are formed. Electronic control unit room 1
A pair of mounting flanges 16 each having a bolt insertion hole for fixing the case 10 to the automatic transmission casing C (see FIG. 1) are provided at a substantially diagonal position of 2 in a protruding manner.

Next, the first cover 20 is made of the same material as that of the case 10, and has a fan shape that corresponds to the outer shape of the switch chamber 11 of the case 10 as shown in FIG. It is shaped so as to be fitted and positioned with respect to 10. Similar to the case 10, the oil seal 6 that inserts the sleeve shaft portion 43 of the rotating member 40 in the key portion of the fan of the first cover 20 and seals the periphery thereof
Is formed with a stepped hole 21 for inserting and inserting a connector 22 integrally formed. Then, on the edge of the mating surface of the case 10 with the switch chamber 11,
A seal ring groove 23 for fitting an O-ring is formed around the periphery.

The second cover 30 is formed in a rectangular plate shape made of a material such as aluminum having good heat conductivity, and is formed as shown in FIG.
~ As shown in Fig. 7 for the outer surface, the inner surface, and the side surface, a plurality of parallel heat radiation fins 31 are provided on the outer surface, and heat transfer protrusions 32 are integrally formed on the inner surface so as to project. A seal ring groove 33 for fitting an O-ring is formed around the periphery of the mating surface 10 of the electronic control unit chamber 10. Then, the plurality of mounting flange portions 34, which are formed to project intermittently along the peripheral edge, are fixed by screws to the case 1
It can be tightened to the front side of 0.

The rotating member 40 is made of the same material as that of the case 10, and has a sleeve shaft portion 43 having a hole 42 through which a manual shaft is inserted, at one end of a plate-like arm portion 41. The hole 42 has a cylindrical shape in a portion having a length approximately half the axial length thereof, and has a remaining half length having a two-face width in which the opposite circumferential surfaces of the cylinder are cut out in parallel. The rotating member 40 is provided with the stepped hole 19 of the case 10.
And the sleeve shaft portion 4 in the stepped hole 21 of the first cover 20.
3 is rotatably fitted and the arm portion 41 is sandwiched between the case 10 and the first cover 20 and disposed in a space surrounded by them. The space between the shaft circumference of the sleeve shaft 43 and the two stepped holes 19 and 21 is sealed by a pair of oil seals 6. Electrically insulating grease is filled in the space, and the first and second switch parts SW1,
Wear of SW2, that is, fixed contacts Pp, Ps, Ps',
It acts as a lubricant for preventing friction between Pr and a conductor (not shown) provided on the rotating member 40. Grease is used as a lubricant for the first and second switch parts SW1,
Since SW2 is covered, short-circuiting of contacts does not occur even if water or dust enters the space.

As shown in FIG. 1, a first switch section SW1 is formed between the rotating member 40 and the first cover 20. As shown in FIG. 4, the first switch section SW1 is formed by stamping from a strip-shaped connecting line 24 embedded in the first cover 20, and is exposed to the inner surface of the first cover 20 in two pairs. Starter motor circuit contacts Ps, P
s ′, a pair of contacts Pr for a reverse lamp lighting circuit,
It is fixed to the arm portion 41 of the rotating member 40, and is composed of a conductor (not shown) that connects the pair of contacts to each other. In this embodiment, the connection line 24 is guided as it is to the inside of the connector 22 and serves as a terminal 28. Thus, the connection line 24 constitutes a circuit in the first cover 20 that returns from the connector terminal 28 to the same terminal and is completed independently of the case 10 only by the first cover 20.

Further, a second switch section SW2 which constitutes the shift position detecting device according to the present invention is formed between the rotating member 40 and the case 10, and the second switch section SW2 is a main switch. In the embodiment, as shown in FIG.
A large number of fixed contacts Pp, which are partly linearly punched out from a heat dissipation surface made of a wide arc-shaped metal plate, such as a copper plate, fixed to the inner surface of the switch chamber 11 of 0, and the rotating member 40. And a rotating contact formed on a conductor (not shown) fixed to the arm portion 41. The connecting line 17 integrated with the arc-shaped fixed contact Pp passes through the partition wall 13 of the case 10 at one end (the left end in FIG. 3) to the board connecting pad portion 12a in the space of the electronic control unit chamber 12, respectively. It is led out and is connected there to a terminal 50a of the electronic control unit substrate 50 (shown by an imaginary line in FIG. 2) by means of wire bonding or the like. Thus, the connecting wire 17 has a function of directly electrically connecting the shift position detecting device (NSW) and the electronic control unit (ECU) in the case 10, and also functions as a heat transfer wire for thermally connecting. Also fulfills.

The electronic control unit substrate 50 is made of a material having excellent thermal conductivity, such as ceramics, or a material having excellent thermal conductivity (ceramics, etc.) on which glass epoxy, which is a conventional material for the substrate, is placed. And is arranged in contact with a step portion in the space of the electronic control unit chamber 12 and positioned, and two connectors 14 and 15 are provided in the pad portion 12a.
Are connected to the terminal connection wire group 18 by the same means such as wire bonding. The pad portion 12 thus connected
a and its periphery, in the present embodiment, the periphery of the connection portion between the connection line 17 shown in FIG. 2 and the terminal 50a of the substrate (indicated by a circle in the figure) is filled with a resin made of a material having excellent thermal conductivity. Hardened. This resin has a thermal conductivity of 1.0 ×, for example.
The efficiency can be expected more by using a material of 10 ⁻³ cal / (cm · sec · ° C) or more. Each terminal connection wire group 18 passes through the inside of the case 10 and the connectors 14, 1
5 and is used as a connection terminal for them. These connectors 14 and 15 are connected to a solenoid valve and various sensors of a hydraulic control device arranged in the main body of the automatic transmission, sensors of various parts of the vehicle, and an engine control device.

The control device thus constructed is fixed to the automatic transmission casing C as shown in FIG. 1, and the shift lever L on the shift device side is shown in FIG. The rotation about the axis X is transmitted to the outer lever A on the main body of the automatic transmission through the control wire W, and the manual shaft S rotates. Then, the rotation of the manual shaft S rotates the rotating member 40 (shown by an imaginary line in the figure) attached thereto. The figure shows a state in which the shift lever L is in the neutral range “N” position. From this state, when the lever L is pushed forward, that is, in the reverse range “R” or parking range “P” position direction, the wire W is pushed. Then, the outer lever A rotates in the direction of the white arrow in the figure, and when the lever L is pulled rearward, that is, in the drive range "D", the third range "3", the second range "2", and the low range "L" position direction, the wire W The outer lever A is pulled by and rotates in the direction of the black arrow shown in the figure. With such an operation, the switching of the switch portion of the shift position detecting device and the sliding switching operation of the manual valve M in the valve body V of the hydraulic control device occur.

In such an operation, on the shift position detector side, at the neutral range "N" and the parking range "P" positions, the starter contacts Ps, shown in FIG.
When Ps' is closed and the reverse range "R" position is
The reverse contact Pr is closed, and in parallel, the second switch section SW2 outputs the corresponding neutral range “N”, parking range “P” position signal or reverse range “R” position signal by closing the same contact. Electronic controller board 50
Output to In addition, in the drive range “D” position and other ranges “3”, “2”, and “L” positions, only the second switch unit SW2 operates, and the corresponding position signal is generated by closing the fixed contacts Pp. Is output to the electronic control unit substrate 50 via the connection line 17.

As described above, in short, in this embodiment, the fixed contact Pp is made of a metal material, the substrate 50 is made of a material having excellent thermal conductivity, and the fixed contact Pp and the terminal 5 of the substrate are formed.
Since the connecting wire 17 that electrically connects 0a also plays the role of a heat transfer wire, the heat generated from each element 51 on the substrate 50 spreads to the entire substrate 50 and is transmitted through the connecting wire 17 to the fixed contact P.
After reaching p, heat is dissipated by using the fixed contact Pp as a heat sink on the shift position detecting device (NSW) side. Therefore, the cooling effect can be further enhanced as compared with the conventional case, heat is not locally accumulated around each element 51, and desired performance as an electronic control unit (ECU) can be exhibited.

Further, since the shift position detecting device (NSW) and the electronic control unit (ECU) are integrally formed, the fixed contact Pp and the terminal 50a of the substrate are electrically connected and also serve as a heat transfer wire. The length of the wire 17 becomes shorter. Therefore, the compactness of the control device is improved, and moreover, the heat from the substrate 50 efficiently reaches the fixed contact Pp through a short transfer path, and the heat is not accumulated around each element 51 on the substrate 50, and the electronic control device ( The ECU) can exhibit the desired performance.

In addition, in this embodiment, the fixed contact Pp
Connection line 17 for electrically connecting the board and the terminal 50a of the substrate
Since the resin that integrally hardens the periphery of the connecting portion with the terminal 50a of the substrate is made of a material having excellent thermal conductivity, the heat transfer from the terminal 50a of the substrate to the connecting wire 17 is significantly improved. Therefore, the substrate 50 can be cooled more effectively than in the conventional case. In addition, the configuration in which the coupling portion is integrally fixed with resin also provides a secondary effect that the electric connection between the connection line 17 and the terminal 50a of the substrate is surely guaranteed by wire bonding or the like.

Although the present invention has been described in detail based on one embodiment, the present invention is not limited to the disclosure of the above embodiment. For example, in the present embodiment, a part of the heat dissipation surface made of a copper plate or the like is used. A large number of fixed contacts are formed by linearly embossing and protruding, but only a large number of fixed contacts are exposed from the partition wall of the case, and heat is dissipated by the fixed contacts other than the fixed contacts that are in contact with the rotating contacts. The surface may be formed. Further, it goes without saying that various specific configurations can be implemented within the scope of the matters described in the claims.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a control device for an automatic transmission according to the present invention.

FIG. 2 is a front view of a case in the embodiment.

FIG. 3 is a rear view of the case.

FIG. 4 is an inside view of the first cover in the above embodiment.

FIG. 5 is an external view of a second cover in the above embodiment.

FIG. 6 is an inside view of the second cover.

FIG. 7 is a side view of the second cover.

FIG. 8 is a layout explanatory view showing a connection relationship between the automatic transmission main body and the shift device of the control device of the embodiment.

[Explanation of symbols]

 NSW shift position detection device ECU electronic control device C automatic transmission casing 10 case 17 connection line 40 rotating member 50 substrate 50a terminal 51 element Pp fixed contact

(72) Inventor Toshiya Morishita, 10 Takane, Fujii-cho, Anjo, Aichi Prefecture, Aisin AW Co., Ltd. (72) Naoto Ogasawara, 10, Takane, Fujii-cho, Anjo, Aichi Prefecture In W Co., Ltd. (72) Inventor Naotaka Murakami 10 Takane, Fujii-cho, Anjo City, Aichi Prefecture Aisin AW Co., Ltd. (72) Ken Kiyama, 10 Takane, Fujii-cho, Anjo City, Aichi Prefecture W Co., Ltd.

Claims (3)

[Claims] 1. A casing, a rotating member which is provided inside the casing and rotates according to a shift operation of a driver, a rotating contact attached to the rotating member, and a rotating contact of the rotating contact. Based on a shift position detecting device configured with a fixed contact provided inside the casing so as to face a turning locus, and a first state and a second state depending on whether the turning contact and the fixed contact are in contact with each other. And an electronic control device for controlling an automatic transmission, wherein the electronic control device includes a substrate and each element arranged on the substrate, and the fixed contact and the terminal of the substrate are connected by a connecting wire. In a control device for an automatic transmission electrically connected, the substrate is made of a material having excellent thermal conductivity, the fixed contact is made of a metal material, and has a heat dissipation surface, and the connection line is the Heat from the PCB terminals to the fixed contacts A control device for an automatic transmission, which also functions as a heat transfer wire for transmission. 2. The control device for an automatic transmission according to claim 1, wherein the shift position detection device and the electronic control device are integrally configured. 3. The connection wire for electrically connecting the fixed contact and the terminal of the substrate and the periphery of the connecting portion of the terminal of the substrate are integrally fixed with a resin made of a material having excellent thermal conductivity.
Alternatively, the control device for the automatic transmission according to item 2.